Stowage/ladybird
2
0
Fork 0
mirror of https://github.com/LadybirdBrowser/ladybird.git synced 2025-10-31 13:20:59 +00:00
Code Issues Projects Releases Packages Wiki Activity
ladybird/Libraries/LibJS/Bytecode/ASTCodegen.cpp

3591 lines
167 KiB
C++
Raw Normal View History

LibJS: Move AST bytecode generation virtuals to separate cpp file This will hopefully make it a bit more pleasant to edit this, as things will just get larger and larger.
2021-06-04 11:31:13 +02:00
/*
LibJS: Constant-fold unary expressions !0 and !1 are very common patterns in minified JavaScript, and we should figure out that they're constants. :^)
2025-03-25 18:01:35 +00:00
* Copyright (c) 2021-2025, Andreas Kling <andreas@ladybird.org>
LibJS: Add bytecode generation for BinaryOp::In
2021-06-07 21:13:37 +01:00
* Copyright (c) 2021, Linus Groh <linusg@serenityos.org>
LibJS: Generate bytecode for throw statements
2021-06-09 18:18:56 +02:00
* Copyright (c) 2021, Gunnar Beutner <gbeutner@serenityos.org>
LibJS: Implement bytecode generation for switch
2021-06-11 00:36:16 +02:00
* Copyright (c) 2021, Marcin Gasperowicz <xnooga@gmail.com>
LibJS: Move AST bytecode generation virtuals to separate cpp file This will hopefully make it a bit more pleasant to edit this, as things will just get larger and larger.
2021-06-04 11:31:13 +02:00
*
* SPDX-License-Identifier: BSD-2-Clause
*/
LibJS: Add support for SpreadExpressions in array literals for bytecode For this it adds another opcode `Append $lhs` which appends the accumulator to the Array in $lhs, optionally spreading it.
2022-09-09 15:23:02 +02:00
#include <AK/Find.h>
LibJS/Bytecode: Bunch all tests together in switch statement codegen Before this change, switch codegen would interleave bytecode like this: (test for case 1) (code for case 1) (test for case 2) (code for case 2) This meant that we often had to make many large jumps while looking for the matching case, since code for each case can be huge. It now looks like this instead: (test for case 1) (test for case 2) (code for case 1) (code for case 2) This way, we can just fall through the tests until we hit one that fits, without having to make any large jumps.
2024-05-08 13:08:38 +02:00
#include <AK/Queue.h>
LibJS: Move AST bytecode generation virtuals to separate cpp file This will hopefully make it a bit more pleasant to edit this, as things will just get larger and larger.
2021-06-04 11:31:13 +02:00
#include <LibJS/AST.h>
#include <LibJS/Bytecode/Generator.h>
#include <LibJS/Bytecode/Instruction.h>
#include <LibJS/Bytecode/Op.h>
#include <LibJS/Bytecode/Register.h>
LibJS: Generate bytecode for entering nested lexical environments This adds a new PushLexicalEnvironment instruction that creates a new LexicalEnvironment and pushes it on the VM's scope stack. There is no corresponding PopLexicalEnvironment instruction yet, so this will behave incorrectly with let/const scopes for example.
2021-06-10 22:12:21 +02:00
#include <LibJS/Bytecode/StringTable.h>
LibJS: Drop "Record" suffix from all the *Environment record classes "Records" in the spec are basically C++ classes, so let's drop this mouthful of a suffix.
2021-07-01 12:24:46 +02:00
#include <LibJS/Runtime/Environment.h>
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
#include <LibJS/Runtime/ErrorTypes.h>
LibJS: Constant-fold unary expressions !0 and !1 are very common patterns in minified JavaScript, and we should figure out that they're constants. :^)
2025-03-25 18:01:35 +00:00
#include <LibJS/Runtime/ValueInlines.h>
LibJS: Move AST bytecode generation virtuals to separate cpp file This will hopefully make it a bit more pleasant to edit this, as things will just get larger and larger.
2021-06-04 11:31:13 +02:00
namespace JS {
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
using namespace JS::Bytecode;
static ScopedOperand choose_dst(Bytecode::Generator& generator, Optional<ScopedOperand> const& preferred_dst)
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
{
if (preferred_dst.has_value())
return preferred_dst.value();
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
return generator.allocate_register();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> ASTNode::generate_bytecode(Bytecode::Generator&, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS: Move AST bytecode generation virtuals to separate cpp file This will hopefully make it a bit more pleasant to edit this, as things will just get larger and larger.
2021-06-04 11:31:13 +02:00
{
LibJS: Make ASTNode::generate_bytecode() fallible Instead of crashing on the spot, return a descriptive error that will eventually continue its days as a javascript "InternalError" exception. This should make random crashes with BC less likely.
2022-02-12 19:54:08 +03:30
return Bytecode::CodeGenerationError {
this,
"Missing generate_bytecode()"sv,
};
LibJS: Move AST bytecode generation virtuals to separate cpp file This will hopefully make it a bit more pleasant to edit this, as things will just get larger and larger.
2021-06-04 11:31:13 +02:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> ScopeNode::generate_bytecode(Bytecode::Generator& generator, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS: Move AST bytecode generation virtuals to separate cpp file This will hopefully make it a bit more pleasant to edit this, as things will just get larger and larger.
2021-06-04 11:31:13 +02:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS/Bytecode: Leave BlockDeclarationInstantiation in C++ Instead of implementing this AO in bytecode, we now have an instruction for it that simply invokes the C++ implementation. This allows us to simplify Bytecode::Generator quite a bit by removing all the variable scope tracking.
2023-06-16 16:34:47 +02:00
bool did_create_lexical_environment = false;
LibJS/Bytecode: Actually exit `switch` statement's lexical scope 95 new passes on test262. :^)
2023-06-25 07:37:24 +02:00
if (is<BlockStatement>(*this)) {
LibJS: More properly implement scoping rules in bytecode codegen Now we emit CreateVariable and SetVariable with the appropriate initialization/environment modes, much closer to the spec. This makes a whole lot of things like let/const variables, function and variable hoisting and some other things work :^)
2022-02-12 19:48:45 +03:30
if (has_lexical_declarations()) {
LibJS/Bytecode: Don't create empty lexical environments This patch stops emitting the BlockDeclarationInstantiation instruction when there are no locals, and no function declarations in the scope. We were spending 20% of CPU time on https://ventrella.com/Clusters/ just creating empty environments for no reason.
2024-05-11 13:25:08 +02:00
did_create_lexical_environment = generator.emit_block_declaration_instantiation(*this);
LibJS: More properly implement scoping rules in bytecode codegen Now we emit CreateVariable and SetVariable with the appropriate initialization/environment modes, much closer to the spec. This makes a whole lot of things like let/const variables, function and variable hoisting and some other things work :^)
2022-02-12 19:48:45 +03:30
}
} else if (is<Program>(*this)) {
LibJS/Bytecode: Leave GlobalDeclarationInstantiation in C++ Don't try to implement this AO in bytecode. Instead, the bytecode Interpreter class now has a run() API with the same inputs as the AST interpreter. It sets up the necessary environments etc, including invoking the GlobalDeclarationInstantiation AO.
2023-06-15 12:36:57 +02:00
// GlobalDeclarationInstantiation is handled by the C++ AO.
LibJS: More properly implement scoping rules in bytecode codegen Now we emit CreateVariable and SetVariable with the appropriate initialization/environment modes, much closer to the spec. This makes a whole lot of things like let/const variables, function and variable hoisting and some other things work :^)
2022-02-12 19:48:45 +03:30
} else {
LibJS/Bytecode: Leave FunctionDeclarationInstantantiation in C++ Instead of trying to implement this AO in bytecode, we can just let it be a C++ thing. Once we implement fast uncaptured locals, we won't even be calling it super often.
2023-06-15 09:14:25 +02:00
// FunctionDeclarationInstantiation is handled by the C++ AO.
LibJS: More properly implement scoping rules in bytecode codegen Now we emit CreateVariable and SetVariable with the appropriate initialization/environment modes, much closer to the spec. This makes a whole lot of things like let/const variables, function and variable hoisting and some other things work :^)
2022-02-12 19:48:45 +03:30
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Optional<ScopedOperand> last_result;
LibJS: Don't generate code after we've encountered a terminating op
2021-06-09 19:57:18 +02:00
for (auto& child : children()) {
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto result = TRY(child->generate_bytecode(generator));
LibJS: Don't track "last result" of ScopeNode if we don't need it This prevents unnecessary bytecode register allocation.
2025-04-07 15:59:30 +02:00
if (generator.must_propagate_completion()) {
if (result.has_value())
last_result = result;
}
LibJS: Don't generate code after we've encountered a terminating op
2021-06-09 19:57:18 +02:00
if (generator.is_current_block_terminated())
break;
}
LibJS: Make ASTNode::generate_bytecode() fallible Instead of crashing on the spot, return a descriptive error that will eventually continue its days as a javascript "InternalError" exception. This should make random crashes with BC less likely.
2022-02-12 19:54:08 +03:30
LibJS/Bytecode: Leave BlockDeclarationInstantiation in C++ Instead of implementing this AO in bytecode, we now have an instruction for it that simply invokes the C++ implementation. This allows us to simplify Bytecode::Generator quite a bit by removing all the variable scope tracking.
2023-06-16 16:34:47 +02:00
if (did_create_lexical_environment)
LibJS: More properly implement scoping rules in bytecode codegen Now we emit CreateVariable and SetVariable with the appropriate initialization/environment modes, much closer to the spec. This makes a whole lot of things like let/const variables, function and variable hoisting and some other things work :^)
2022-02-12 19:48:45 +03:30
generator.end_variable_scope();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return last_result;
LibJS: Move AST bytecode generation virtuals to separate cpp file This will hopefully make it a bit more pleasant to edit this, as things will just get larger and larger.
2021-06-04 11:31:13 +02:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> EmptyStatement::generate_bytecode(Bytecode::Generator&, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS: Add bytecode generation for EmptyStatement
2021-06-07 20:47:26 +02:00
{
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
return Optional<ScopedOperand> {};
LibJS: Add bytecode generation for EmptyStatement
2021-06-07 20:47:26 +02:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> ExpressionStatement::generate_bytecode(Bytecode::Generator& generator, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS: Move AST bytecode generation virtuals to separate cpp file This will hopefully make it a bit more pleasant to edit this, as things will just get larger and larger.
2021-06-04 11:31:13 +02:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS: Make ASTNode::generate_bytecode() fallible Instead of crashing on the spot, return a descriptive error that will eventually continue its days as a javascript "InternalError" exception. This should make random crashes with BC less likely.
2022-02-12 19:54:08 +03:30
return m_expression->generate_bytecode(generator);
LibJS: Move AST bytecode generation virtuals to separate cpp file This will hopefully make it a bit more pleasant to edit this, as things will just get larger and larger.
2021-06-04 11:31:13 +02:00
}
LibJS: Constant-fold unary expressions !0 and !1 are very common patterns in minified JavaScript, and we should figure out that they're constants. :^)
2025-03-25 18:01:35 +00:00
static ThrowCompletionOr<ScopedOperand> constant_fold_unary_expression(Generator& generator, Value value, UnaryOp op)
{
switch (op) {
case UnaryOp::Minus:
return generator.add_constant(Value(-TRY(value.to_double(generator.vm()))));
case UnaryOp::Plus:
return generator.add_constant(Value(+TRY(value.to_double(generator.vm()))));
case UnaryOp::BitwiseNot:
return generator.add_constant(TRY(bitwise_not(generator.vm(), value)));
case UnaryOp::Not:
return generator.add_constant(Value(!value.to_boolean()));
default:
return throw_completion(js_null());
}
}
LibJS/Bytecode: Perform constant folding on binary expressions This turns expressions like `(2 + 3) * 8 / 2` into a constant (20) at bytecode compilation time instead of generating instructions to calculate the value.
2024-05-31 21:49:46 +02:00
static ThrowCompletionOr<ScopedOperand> constant_fold_binary_expression(Generator& generator, Value lhs, Value rhs, BinaryOp m_op)
{
switch (m_op) {
case BinaryOp::Addition:
return generator.add_constant(TRY(add(generator.vm(), lhs, rhs)));
case BinaryOp::Subtraction:
return generator.add_constant(TRY(sub(generator.vm(), lhs, rhs)));
case BinaryOp::Multiplication:
return generator.add_constant(TRY(mul(generator.vm(), lhs, rhs)));
case BinaryOp::Division:
return generator.add_constant(TRY(div(generator.vm(), lhs, rhs)));
case BinaryOp::Modulo:
return generator.add_constant(TRY(mod(generator.vm(), lhs, rhs)));
case BinaryOp::Exponentiation:
return generator.add_constant(TRY(exp(generator.vm(), lhs, rhs)));
case BinaryOp::GreaterThan:
return generator.add_constant(TRY(greater_than(generator.vm(), lhs, rhs)));
case BinaryOp::GreaterThanEquals:
return generator.add_constant(TRY(greater_than_equals(generator.vm(), lhs, rhs)));
case BinaryOp::LessThan:
return generator.add_constant(TRY(less_than(generator.vm(), lhs, rhs)));
case BinaryOp::LessThanEquals:
return generator.add_constant(TRY(less_than_equals(generator.vm(), lhs, rhs)));
case BinaryOp::LooselyInequals:
return generator.add_constant(Value(!TRY(is_loosely_equal(generator.vm(), lhs, rhs))));
case BinaryOp::LooselyEquals:
return generator.add_constant(Value(TRY(is_loosely_equal(generator.vm(), lhs, rhs))));
case BinaryOp::StrictlyInequals:
return generator.add_constant(Value(!is_strictly_equal(lhs, rhs)));
case BinaryOp::StrictlyEquals:
return generator.add_constant(Value(is_strictly_equal(lhs, rhs)));
case BinaryOp::BitwiseAnd:
return generator.add_constant(TRY(bitwise_and(generator.vm(), lhs, rhs)));
case BinaryOp::BitwiseOr:
return generator.add_constant(TRY(bitwise_or(generator.vm(), lhs, rhs)));
case BinaryOp::BitwiseXor:
return generator.add_constant(TRY(bitwise_xor(generator.vm(), lhs, rhs)));
case BinaryOp::LeftShift:
return generator.add_constant(TRY(left_shift(generator.vm(), lhs, rhs)));
case BinaryOp::RightShift:
return generator.add_constant(TRY(right_shift(generator.vm(), lhs, rhs)));
case BinaryOp::UnsignedRightShift:
return generator.add_constant(TRY(unsigned_right_shift(generator.vm(), lhs, rhs)));
case BinaryOp::In:
case BinaryOp::InstanceOf:
// NOTE: We just have to throw *something* to indicate that this is not a constant foldable operation.
return throw_completion(js_null());
default:
VERIFY_NOT_REACHED();
}
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> BinaryExpression::generate_bytecode(Bytecode::Generator& generator, Optional<ScopedOperand> preferred_dst) const
LibJS: Move AST bytecode generation virtuals to separate cpp file This will hopefully make it a bit more pleasant to edit this, as things will just get larger and larger.
2021-06-04 11:31:13 +02:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS/Bytecode: Support `in` binary operator for private fields 11 new passes on test262. :^)
2023-07-05 12:42:50 +02:00
if (m_op == BinaryOp::In && is<PrivateIdentifier>(*m_lhs)) {
auto const& private_identifier = static_cast<PrivateIdentifier const&>(*m_lhs).string();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto base = TRY(m_rhs->generate_bytecode(generator)).value();
auto dst = choose_dst(generator, preferred_dst);
generator.emit<Bytecode::Op::HasPrivateId>(dst, base, generator.intern_identifier(private_identifier));
return dst;
LibJS/Bytecode: Support `in` binary operator for private fields 11 new passes on test262. :^)
2023-07-05 12:42:50 +02:00
}
LibJS/Bytecode: Round constant operands of bitwise binary expressions This helps some of the Cloudflare Turnstile stuff run faster, since they are deliberately screwing with JS engines by asking us to do a bunch of bitwise operations on e.g 65535.56 By rounding such values in bytecode generation, the interpreter can stay on the happy path while executing, and finish quite a bit faster.
2024-05-09 15:17:34 +02:00
// OPTIMIZATION: If LHS and/or RHS are numeric literals, we make sure they are converted to i32/u32
// as appropriate, to avoid having to perform these conversions at runtime.
LibJS: Move AST bytecode generation virtuals to separate cpp file This will hopefully make it a bit more pleasant to edit this, as things will just get larger and larger.
2021-06-04 11:31:13 +02:00
LibJS/Bytecode: Round constant operands of bitwise binary expressions This helps some of the Cloudflare Turnstile stuff run faster, since they are deliberately screwing with JS engines by asking us to do a bunch of bitwise operations on e.g 65535.56 By rounding such values in bytecode generation, the interpreter can stay on the happy path while executing, and finish quite a bit faster.
2024-05-09 15:17:34 +02:00
auto get_left_side = [&](Expression const& side) -> CodeGenerationErrorOr<Optional<ScopedOperand>> {
switch (m_op) {
case BinaryOp::BitwiseAnd:
case BinaryOp::BitwiseOr:
case BinaryOp::BitwiseXor:
case BinaryOp::LeftShift:
case BinaryOp::RightShift:
case BinaryOp::UnsignedRightShift:
// LHS will always be converted to i32 for these ops.
if (side.is_numeric_literal()) {
auto value = MUST(static_cast<NumericLiteral const&>(side).value().to_i32(generator.vm()));
return generator.add_constant(Value(value));
}
break;
default:
break;
}
return side.generate_bytecode(generator);
};
auto get_right_side = [&](Expression const& side) -> CodeGenerationErrorOr<Optional<ScopedOperand>> {
switch (m_op) {
case BinaryOp::BitwiseAnd:
case BinaryOp::BitwiseOr:
case BinaryOp::BitwiseXor:
// RHS will always be converted to i32 for these ops.
if (side.is_numeric_literal()) {
auto value = MUST(static_cast<NumericLiteral const&>(side).value().to_i32(generator.vm()));
return generator.add_constant(Value(value));
}
break;
case BinaryOp::LeftShift:
case BinaryOp::RightShift:
case BinaryOp::UnsignedRightShift:
// RHS will always be converted to u32 for these ops.
if (side.is_numeric_literal()) {
auto value = MUST(static_cast<NumericLiteral const&>(side).value().to_u32(generator.vm()));
return generator.add_constant(Value(value));
}
break;
default:
break;
}
return side.generate_bytecode(generator);
};
auto lhs = TRY(get_left_side(*m_lhs)).value();
auto rhs = TRY(get_right_side(*m_rhs)).value();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto dst = choose_dst(generator, preferred_dst);
LibJS/Bytecode: Perform constant folding on binary expressions This turns expressions like `(2 + 3) * 8 / 2` into a constant (20) at bytecode compilation time instead of generating instructions to calculate the value.
2024-05-31 21:49:46 +02:00
// OPTIMIZATION: Do some basic constant folding for binary operations.
if (lhs.operand().is_constant() && rhs.operand().is_constant()) {
if (auto result = constant_fold_binary_expression(generator, generator.get_constant(lhs), generator.get_constant(rhs), m_op); !result.is_error())
return result.release_value();
}
LibJS: Move AST bytecode generation virtuals to separate cpp file This will hopefully make it a bit more pleasant to edit this, as things will just get larger and larger.
2021-06-04 11:31:13 +02:00
switch (m_op) {
case BinaryOp::Addition:
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::Add>(dst, lhs, rhs);
LibJS: Introduce an accumulator register to Bytecode::Interpreter This commit introduces the concept of an accumulator register to LibJS's bytecode interpreter. The accumulator register is always register 0, and most simple instructions use it for reading and writing. Not only does this slim down the AST, but it also simplifies a lot of the code. For example, the generate_bytecode methods no longer need to return an Optional<Register>, as any opcode which has a "return" value will always put it into the accumulator. This also renames the old Op::Load to Op::LoadImmediate, and uses Op::Load to load from a register into the accumulator. There is also an Op::Store to put the value in the accumulator into another register.
2021-06-07 20:58:36 -07:00
break;
LibJS: Move AST bytecode generation virtuals to separate cpp file This will hopefully make it a bit more pleasant to edit this, as things will just get larger and larger.
2021-06-04 11:31:13 +02:00
case BinaryOp::Subtraction:
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::Sub>(dst, lhs, rhs);
LibJS: Introduce an accumulator register to Bytecode::Interpreter This commit introduces the concept of an accumulator register to LibJS's bytecode interpreter. The accumulator register is always register 0, and most simple instructions use it for reading and writing. Not only does this slim down the AST, but it also simplifies a lot of the code. For example, the generate_bytecode methods no longer need to return an Optional<Register>, as any opcode which has a "return" value will always put it into the accumulator. This also renames the old Op::Load to Op::LoadImmediate, and uses Op::Load to load from a register into the accumulator. There is also an Op::Store to put the value in the accumulator into another register.
2021-06-07 20:58:36 -07:00
break;
LibJS: Add bytecode instructions for multiplication and division
2021-06-07 19:17:20 +02:00
case BinaryOp::Multiplication:
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::Mul>(dst, lhs, rhs);
LibJS: Introduce an accumulator register to Bytecode::Interpreter This commit introduces the concept of an accumulator register to LibJS's bytecode interpreter. The accumulator register is always register 0, and most simple instructions use it for reading and writing. Not only does this slim down the AST, but it also simplifies a lot of the code. For example, the generate_bytecode methods no longer need to return an Optional<Register>, as any opcode which has a "return" value will always put it into the accumulator. This also renames the old Op::Load to Op::LoadImmediate, and uses Op::Load to load from a register into the accumulator. There is also an Op::Store to put the value in the accumulator into another register.
2021-06-07 20:58:36 -07:00
break;
LibJS: Add bytecode instructions for multiplication and division
2021-06-07 19:17:20 +02:00
case BinaryOp::Division:
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::Div>(dst, lhs, rhs);
LibJS: Introduce an accumulator register to Bytecode::Interpreter This commit introduces the concept of an accumulator register to LibJS's bytecode interpreter. The accumulator register is always register 0, and most simple instructions use it for reading and writing. Not only does this slim down the AST, but it also simplifies a lot of the code. For example, the generate_bytecode methods no longer need to return an Optional<Register>, as any opcode which has a "return" value will always put it into the accumulator. This also renames the old Op::Load to Op::LoadImmediate, and uses Op::Load to load from a register into the accumulator. There is also an Op::Store to put the value in the accumulator into another register.
2021-06-07 20:58:36 -07:00
break;
LibJS: Add bytecode instructions for modulo and exponentiation
2021-06-07 19:37:23 +02:00
case BinaryOp::Modulo:
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::Mod>(dst, lhs, rhs);
LibJS: Introduce an accumulator register to Bytecode::Interpreter This commit introduces the concept of an accumulator register to LibJS's bytecode interpreter. The accumulator register is always register 0, and most simple instructions use it for reading and writing. Not only does this slim down the AST, but it also simplifies a lot of the code. For example, the generate_bytecode methods no longer need to return an Optional<Register>, as any opcode which has a "return" value will always put it into the accumulator. This also renames the old Op::Load to Op::LoadImmediate, and uses Op::Load to load from a register into the accumulator. There is also an Op::Store to put the value in the accumulator into another register.
2021-06-07 20:58:36 -07:00
break;
LibJS: Add bytecode instructions for modulo and exponentiation
2021-06-07 19:37:23 +02:00
case BinaryOp::Exponentiation:
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::Exp>(dst, lhs, rhs);
LibJS: Introduce an accumulator register to Bytecode::Interpreter This commit introduces the concept of an accumulator register to LibJS's bytecode interpreter. The accumulator register is always register 0, and most simple instructions use it for reading and writing. Not only does this slim down the AST, but it also simplifies a lot of the code. For example, the generate_bytecode methods no longer need to return an Optional<Register>, as any opcode which has a "return" value will always put it into the accumulator. This also renames the old Op::Load to Op::LoadImmediate, and uses Op::Load to load from a register into the accumulator. There is also an Op::Store to put the value in the accumulator into another register.
2021-06-07 20:58:36 -07:00
break;
LibJS: Add bytecode ops for >, >= and <=
2021-06-07 19:57:38 +02:00
case BinaryOp::GreaterThan:
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::GreaterThan>(dst, lhs, rhs);
LibJS: Introduce an accumulator register to Bytecode::Interpreter This commit introduces the concept of an accumulator register to LibJS's bytecode interpreter. The accumulator register is always register 0, and most simple instructions use it for reading and writing. Not only does this slim down the AST, but it also simplifies a lot of the code. For example, the generate_bytecode methods no longer need to return an Optional<Register>, as any opcode which has a "return" value will always put it into the accumulator. This also renames the old Op::Load to Op::LoadImmediate, and uses Op::Load to load from a register into the accumulator. There is also an Op::Store to put the value in the accumulator into another register.
2021-06-07 20:58:36 -07:00
break;
LibJS: Add bytecode ops for >, >= and <=
2021-06-07 19:57:38 +02:00
case BinaryOp::GreaterThanEquals:
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::GreaterThanEquals>(dst, lhs, rhs);
LibJS: Introduce an accumulator register to Bytecode::Interpreter This commit introduces the concept of an accumulator register to LibJS's bytecode interpreter. The accumulator register is always register 0, and most simple instructions use it for reading and writing. Not only does this slim down the AST, but it also simplifies a lot of the code. For example, the generate_bytecode methods no longer need to return an Optional<Register>, as any opcode which has a "return" value will always put it into the accumulator. This also renames the old Op::Load to Op::LoadImmediate, and uses Op::Load to load from a register into the accumulator. There is also an Op::Store to put the value in the accumulator into another register.
2021-06-07 20:58:36 -07:00
break;
LibJS: Add LessThan bytecode instruction :^)
2021-06-04 12:03:57 +02:00
case BinaryOp::LessThan:
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::LessThan>(dst, lhs, rhs);
LibJS: Introduce an accumulator register to Bytecode::Interpreter This commit introduces the concept of an accumulator register to LibJS's bytecode interpreter. The accumulator register is always register 0, and most simple instructions use it for reading and writing. Not only does this slim down the AST, but it also simplifies a lot of the code. For example, the generate_bytecode methods no longer need to return an Optional<Register>, as any opcode which has a "return" value will always put it into the accumulator. This also renames the old Op::Load to Op::LoadImmediate, and uses Op::Load to load from a register into the accumulator. There is also an Op::Store to put the value in the accumulator into another register.
2021-06-07 20:58:36 -07:00
break;
LibJS: Add bytecode ops for >, >= and <=
2021-06-07 19:57:38 +02:00
case BinaryOp::LessThanEquals:
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::LessThanEquals>(dst, lhs, rhs);
LibJS: Introduce an accumulator register to Bytecode::Interpreter This commit introduces the concept of an accumulator register to LibJS's bytecode interpreter. The accumulator register is always register 0, and most simple instructions use it for reading and writing. Not only does this slim down the AST, but it also simplifies a lot of the code. For example, the generate_bytecode methods no longer need to return an Optional<Register>, as any opcode which has a "return" value will always put it into the accumulator. This also renames the old Op::Load to Op::LoadImmediate, and uses Op::Load to load from a register into the accumulator. There is also an Op::Store to put the value in the accumulator into another register.
2021-06-07 20:58:36 -07:00
break;
LibJS: Rename {Abstract,Typed => Loosely,Strictly}{Equals,Inequals} This affects the AST's BinaryOp enum as well as the Bytecode's ENUMERATE_BYTECODE_OPS and JS_ENUMERATE_COMMON_BINARY_OPS macros.
2021-09-24 00:06:10 +02:00
case BinaryOp::LooselyInequals:
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::LooselyInequals>(dst, lhs, rhs);
LibJS: Introduce an accumulator register to Bytecode::Interpreter This commit introduces the concept of an accumulator register to LibJS's bytecode interpreter. The accumulator register is always register 0, and most simple instructions use it for reading and writing. Not only does this slim down the AST, but it also simplifies a lot of the code. For example, the generate_bytecode methods no longer need to return an Optional<Register>, as any opcode which has a "return" value will always put it into the accumulator. This also renames the old Op::Load to Op::LoadImmediate, and uses Op::Load to load from a register into the accumulator. There is also an Op::Store to put the value in the accumulator into another register.
2021-06-07 20:58:36 -07:00
break;
LibJS: Rename {Abstract,Typed => Loosely,Strictly}{Equals,Inequals} This affects the AST's BinaryOp enum as well as the Bytecode's ENUMERATE_BYTECODE_OPS and JS_ENUMERATE_COMMON_BINARY_OPS macros.
2021-09-24 00:06:10 +02:00
case BinaryOp::LooselyEquals:
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::LooselyEquals>(dst, lhs, rhs);
LibJS: Introduce an accumulator register to Bytecode::Interpreter This commit introduces the concept of an accumulator register to LibJS's bytecode interpreter. The accumulator register is always register 0, and most simple instructions use it for reading and writing. Not only does this slim down the AST, but it also simplifies a lot of the code. For example, the generate_bytecode methods no longer need to return an Optional<Register>, as any opcode which has a "return" value will always put it into the accumulator. This also renames the old Op::Load to Op::LoadImmediate, and uses Op::Load to load from a register into the accumulator. There is also an Op::Store to put the value in the accumulator into another register.
2021-06-07 20:58:36 -07:00
break;
LibJS: Rename {Abstract,Typed => Loosely,Strictly}{Equals,Inequals} This affects the AST's BinaryOp enum as well as the Bytecode's ENUMERATE_BYTECODE_OPS and JS_ENUMERATE_COMMON_BINARY_OPS macros.
2021-09-24 00:06:10 +02:00
case BinaryOp::StrictlyInequals:
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::StrictlyInequals>(dst, lhs, rhs);
LibJS: Introduce an accumulator register to Bytecode::Interpreter This commit introduces the concept of an accumulator register to LibJS's bytecode interpreter. The accumulator register is always register 0, and most simple instructions use it for reading and writing. Not only does this slim down the AST, but it also simplifies a lot of the code. For example, the generate_bytecode methods no longer need to return an Optional<Register>, as any opcode which has a "return" value will always put it into the accumulator. This also renames the old Op::Load to Op::LoadImmediate, and uses Op::Load to load from a register into the accumulator. There is also an Op::Store to put the value in the accumulator into another register.
2021-06-07 20:58:36 -07:00
break;
LibJS: Rename {Abstract,Typed => Loosely,Strictly}{Equals,Inequals} This affects the AST's BinaryOp enum as well as the Bytecode's ENUMERATE_BYTECODE_OPS and JS_ENUMERATE_COMMON_BINARY_OPS macros.
2021-09-24 00:06:10 +02:00
case BinaryOp::StrictlyEquals:
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::StrictlyEquals>(dst, lhs, rhs);
LibJS: Introduce an accumulator register to Bytecode::Interpreter This commit introduces the concept of an accumulator register to LibJS's bytecode interpreter. The accumulator register is always register 0, and most simple instructions use it for reading and writing. Not only does this slim down the AST, but it also simplifies a lot of the code. For example, the generate_bytecode methods no longer need to return an Optional<Register>, as any opcode which has a "return" value will always put it into the accumulator. This also renames the old Op::Load to Op::LoadImmediate, and uses Op::Load to load from a register into the accumulator. There is also an Op::Store to put the value in the accumulator into another register.
2021-06-07 20:58:36 -07:00
break;
LibJS: Add bytecode ops for &, | and ^
2021-06-07 19:16:04 +01:00
case BinaryOp::BitwiseAnd:
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::BitwiseAnd>(dst, lhs, rhs);
LibJS: Introduce an accumulator register to Bytecode::Interpreter This commit introduces the concept of an accumulator register to LibJS's bytecode interpreter. The accumulator register is always register 0, and most simple instructions use it for reading and writing. Not only does this slim down the AST, but it also simplifies a lot of the code. For example, the generate_bytecode methods no longer need to return an Optional<Register>, as any opcode which has a "return" value will always put it into the accumulator. This also renames the old Op::Load to Op::LoadImmediate, and uses Op::Load to load from a register into the accumulator. There is also an Op::Store to put the value in the accumulator into another register.
2021-06-07 20:58:36 -07:00
break;
LibJS: Add bytecode ops for &, | and ^
2021-06-07 19:16:04 +01:00
case BinaryOp::BitwiseOr:
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::BitwiseOr>(dst, lhs, rhs);
LibJS: Introduce an accumulator register to Bytecode::Interpreter This commit introduces the concept of an accumulator register to LibJS's bytecode interpreter. The accumulator register is always register 0, and most simple instructions use it for reading and writing. Not only does this slim down the AST, but it also simplifies a lot of the code. For example, the generate_bytecode methods no longer need to return an Optional<Register>, as any opcode which has a "return" value will always put it into the accumulator. This also renames the old Op::Load to Op::LoadImmediate, and uses Op::Load to load from a register into the accumulator. There is also an Op::Store to put the value in the accumulator into another register.
2021-06-07 20:58:36 -07:00
break;
LibJS: Add bytecode ops for &, | and ^
2021-06-07 19:16:04 +01:00
case BinaryOp::BitwiseXor:
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::BitwiseXor>(dst, lhs, rhs);
LibJS: Introduce an accumulator register to Bytecode::Interpreter This commit introduces the concept of an accumulator register to LibJS's bytecode interpreter. The accumulator register is always register 0, and most simple instructions use it for reading and writing. Not only does this slim down the AST, but it also simplifies a lot of the code. For example, the generate_bytecode methods no longer need to return an Optional<Register>, as any opcode which has a "return" value will always put it into the accumulator. This also renames the old Op::Load to Op::LoadImmediate, and uses Op::Load to load from a register into the accumulator. There is also an Op::Store to put the value in the accumulator into another register.
2021-06-07 20:58:36 -07:00
break;
LibJS: Add bytecode ops for <<, >> and >>>
2021-06-07 20:14:12 +01:00
case BinaryOp::LeftShift:
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::LeftShift>(dst, lhs, rhs);
LibJS: Introduce an accumulator register to Bytecode::Interpreter This commit introduces the concept of an accumulator register to LibJS's bytecode interpreter. The accumulator register is always register 0, and most simple instructions use it for reading and writing. Not only does this slim down the AST, but it also simplifies a lot of the code. For example, the generate_bytecode methods no longer need to return an Optional<Register>, as any opcode which has a "return" value will always put it into the accumulator. This also renames the old Op::Load to Op::LoadImmediate, and uses Op::Load to load from a register into the accumulator. There is also an Op::Store to put the value in the accumulator into another register.
2021-06-07 20:58:36 -07:00
break;
LibJS: Add bytecode ops for <<, >> and >>>
2021-06-07 20:14:12 +01:00
case BinaryOp::RightShift:
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::RightShift>(dst, lhs, rhs);
LibJS: Introduce an accumulator register to Bytecode::Interpreter This commit introduces the concept of an accumulator register to LibJS's bytecode interpreter. The accumulator register is always register 0, and most simple instructions use it for reading and writing. Not only does this slim down the AST, but it also simplifies a lot of the code. For example, the generate_bytecode methods no longer need to return an Optional<Register>, as any opcode which has a "return" value will always put it into the accumulator. This also renames the old Op::Load to Op::LoadImmediate, and uses Op::Load to load from a register into the accumulator. There is also an Op::Store to put the value in the accumulator into another register.
2021-06-07 20:58:36 -07:00
break;
LibJS: Add bytecode ops for <<, >> and >>>
2021-06-07 20:14:12 +01:00
case BinaryOp::UnsignedRightShift:
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::UnsignedRightShift>(dst, lhs, rhs);
LibJS: Introduce an accumulator register to Bytecode::Interpreter This commit introduces the concept of an accumulator register to LibJS's bytecode interpreter. The accumulator register is always register 0, and most simple instructions use it for reading and writing. Not only does this slim down the AST, but it also simplifies a lot of the code. For example, the generate_bytecode methods no longer need to return an Optional<Register>, as any opcode which has a "return" value will always put it into the accumulator. This also renames the old Op::Load to Op::LoadImmediate, and uses Op::Load to load from a register into the accumulator. There is also an Op::Store to put the value in the accumulator into another register.
2021-06-07 20:58:36 -07:00
break;
LibJS: Add bytecode generation for BinaryOp::In
2021-06-07 21:13:37 +01:00
case BinaryOp::In:
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::In>(dst, lhs, rhs);
LibJS: Introduce an accumulator register to Bytecode::Interpreter This commit introduces the concept of an accumulator register to LibJS's bytecode interpreter. The accumulator register is always register 0, and most simple instructions use it for reading and writing. Not only does this slim down the AST, but it also simplifies a lot of the code. For example, the generate_bytecode methods no longer need to return an Optional<Register>, as any opcode which has a "return" value will always put it into the accumulator. This also renames the old Op::Load to Op::LoadImmediate, and uses Op::Load to load from a register into the accumulator. There is also an Op::Store to put the value in the accumulator into another register.
2021-06-07 20:58:36 -07:00
break;
LibJS: Add bytecode generation for BinaryOp::InstanceOf
2021-06-07 21:18:19 +01:00
case BinaryOp::InstanceOf:
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::InstanceOf>(dst, lhs, rhs);
LibJS: Introduce an accumulator register to Bytecode::Interpreter This commit introduces the concept of an accumulator register to LibJS's bytecode interpreter. The accumulator register is always register 0, and most simple instructions use it for reading and writing. Not only does this slim down the AST, but it also simplifies a lot of the code. For example, the generate_bytecode methods no longer need to return an Optional<Register>, as any opcode which has a "return" value will always put it into the accumulator. This also renames the old Op::Load to Op::LoadImmediate, and uses Op::Load to load from a register into the accumulator. There is also an Op::Store to put the value in the accumulator into another register.
2021-06-07 20:58:36 -07:00
break;
LibJS: Move AST bytecode generation virtuals to separate cpp file This will hopefully make it a bit more pleasant to edit this, as things will just get larger and larger.
2021-06-04 11:31:13 +02:00
default:
LibJS: Add bytecode generation for BinaryOp::InstanceOf
2021-06-07 21:18:19 +01:00
VERIFY_NOT_REACHED();
LibJS: Move AST bytecode generation virtuals to separate cpp file This will hopefully make it a bit more pleasant to edit this, as things will just get larger and larger.
2021-06-04 11:31:13 +02:00
}
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return dst;
LibJS: Move AST bytecode generation virtuals to separate cpp file This will hopefully make it a bit more pleasant to edit this, as things will just get larger and larger.
2021-06-04 11:31:13 +02:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> LogicalExpression::generate_bytecode(Bytecode::Generator& generator, Optional<ScopedOperand> preferred_dst) const
LibJS: Implement bytecode ops for logical expressions
2021-06-08 02:18:47 +02:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto dst = choose_dst(generator, preferred_dst);
auto lhs = TRY(m_lhs->generate_bytecode(generator, preferred_dst)).value();
// FIXME: Only mov lhs into dst in case lhs is the value taken.
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(dst, lhs);
LibJS: Implement bytecode ops for logical expressions
2021-06-08 02:18:47 +02:00
LibJS: Generate bytecode in basic blocks instead of one big block This limits the size of each block (currently set to 1K), and gets us closer to a canonical, more easily analysable bytecode format. As a result of this, "Labels" are now simply entries to basic blocks. Since there is no more 'conditional' jump (as all jumps are always taken), JumpIf{True,False} are unified to JumpConditional, and JumpIfNullish is renamed to JumpNullish. Also fixes #7914 as a result of reimplementing the loop logic.
2021-06-09 06:49:58 +04:30
// lhs
// jump op (true) end (false) rhs
// rhs
// jump always (true) end
// end
auto& rhs_block = generator.make_block();
auto& end_block = generator.make_block();
LibJS: Implement bytecode ops for logical expressions
2021-06-08 02:18:47 +02:00
switch (m_op) {
case LogicalOp::And:
LibJS/Bytecode: Do basic compare-and-jump peephole optimization We now fuse sequences like [LessThan, JumpIf] to JumpLessThan. This is only allowed for temporaries (i.e VM registers) with no other references to them.
2024-05-09 15:13:31 +02:00
generator.emit_jump_if(
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
lhs,
LibJS: Generate bytecode in basic blocks instead of one big block This limits the size of each block (currently set to 1K), and gets us closer to a canonical, more easily analysable bytecode format. As a result of this, "Labels" are now simply entries to basic blocks. Since there is no more 'conditional' jump (as all jumps are always taken), JumpIf{True,False} are unified to JumpConditional, and JumpIfNullish is renamed to JumpNullish. Also fixes #7914 as a result of reimplementing the loop logic.
2021-06-09 06:49:58 +04:30
Bytecode::Label { rhs_block },
Bytecode::Label { end_block });
LibJS: Implement bytecode ops for logical expressions
2021-06-08 02:18:47 +02:00
break;
case LogicalOp::Or:
LibJS/Bytecode: Do basic compare-and-jump peephole optimization We now fuse sequences like [LessThan, JumpIf] to JumpLessThan. This is only allowed for temporaries (i.e VM registers) with no other references to them.
2024-05-09 15:13:31 +02:00
generator.emit_jump_if(
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
lhs,
LibJS: Generate bytecode in basic blocks instead of one big block This limits the size of each block (currently set to 1K), and gets us closer to a canonical, more easily analysable bytecode format. As a result of this, "Labels" are now simply entries to basic blocks. Since there is no more 'conditional' jump (as all jumps are always taken), JumpIf{True,False} are unified to JumpConditional, and JumpIfNullish is renamed to JumpNullish. Also fixes #7914 as a result of reimplementing the loop logic.
2021-06-09 06:49:58 +04:30
Bytecode::Label { end_block },
Bytecode::Label { rhs_block });
LibJS: Implement bytecode ops for logical expressions
2021-06-08 02:18:47 +02:00
break;
case LogicalOp::NullishCoalescing:
LibJS: Remove almost all uses of Op::Jump::set_targets() We should initialize jump targets when constructing the jump instruction instead of doing it later. This was already the case in all construction sites but one. This first patch converts all those sites to pass final targets to the constructor directly.
2023-09-28 12:43:11 +02:00
generator.emit<Bytecode::Op::JumpNullish>(
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
lhs,
LibJS: Generate bytecode in basic blocks instead of one big block This limits the size of each block (currently set to 1K), and gets us closer to a canonical, more easily analysable bytecode format. As a result of this, "Labels" are now simply entries to basic blocks. Since there is no more 'conditional' jump (as all jumps are always taken), JumpIf{True,False} are unified to JumpConditional, and JumpIfNullish is renamed to JumpNullish. Also fixes #7914 as a result of reimplementing the loop logic.
2021-06-09 06:49:58 +04:30
Bytecode::Label { rhs_block },
Bytecode::Label { end_block });
LibJS: Implement bytecode ops for logical expressions
2021-06-08 02:18:47 +02:00
break;
default:
VERIFY_NOT_REACHED();
}
LibJS: Generate bytecode in basic blocks instead of one big block This limits the size of each block (currently set to 1K), and gets us closer to a canonical, more easily analysable bytecode format. As a result of this, "Labels" are now simply entries to basic blocks. Since there is no more 'conditional' jump (as all jumps are always taken), JumpIf{True,False} are unified to JumpConditional, and JumpIfNullish is renamed to JumpNullish. Also fixes #7914 as a result of reimplementing the loop logic.
2021-06-09 06:49:58 +04:30
generator.switch_to_basic_block(rhs_block);
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
LibJS: Reduce Mov instructions by using preferred destinations
2025-03-28 01:30:35 +01:00
auto rhs = TRY(m_rhs->generate_bytecode(generator, dst)).value();
LibJS: Generate bytecode in basic blocks instead of one big block This limits the size of each block (currently set to 1K), and gets us closer to a canonical, more easily analysable bytecode format. As a result of this, "Labels" are now simply entries to basic blocks. Since there is no more 'conditional' jump (as all jumps are always taken), JumpIf{True,False} are unified to JumpConditional, and JumpIfNullish is renamed to JumpNullish. Also fixes #7914 as a result of reimplementing the loop logic.
2021-06-09 06:49:58 +04:30
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(dst, rhs);
LibJS: Remove almost all uses of Op::Jump::set_targets() We should initialize jump targets when constructing the jump instruction instead of doing it later. This was already the case in all construction sites but one. This first patch converts all those sites to pass final targets to the constructor directly.
2023-09-28 12:43:11 +02:00
generator.emit<Bytecode::Op::Jump>(Bytecode::Label { end_block });
LibJS: Generate bytecode in basic blocks instead of one big block This limits the size of each block (currently set to 1K), and gets us closer to a canonical, more easily analysable bytecode format. As a result of this, "Labels" are now simply entries to basic blocks. Since there is no more 'conditional' jump (as all jumps are always taken), JumpIf{True,False} are unified to JumpConditional, and JumpIfNullish is renamed to JumpNullish. Also fixes #7914 as a result of reimplementing the loop logic.
2021-06-09 06:49:58 +04:30
generator.switch_to_basic_block(end_block);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return dst;
LibJS: Implement bytecode ops for logical expressions
2021-06-08 02:18:47 +02:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> UnaryExpression::generate_bytecode(Bytecode::Generator& generator, Optional<ScopedOperand> preferred_dst) const
LibJS: Add bytecode instructions for a bunch of unary operators ~, !, +, -, typeof, and void.
2021-06-07 19:53:47 +01:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS/Bytecode: Turn UnaryMinus(NumericLiteral) into a constant
2024-05-09 19:48:25 +02:00
LibJS/Bytecode: Implement the delete unary expression `delete` has to operate directly on Reference Records, so this introduces a new set of operations called DeleteByValue, DeleteVariable and DeleteById. They operate similarly to their Get counterparts, except they end in creating a (temporary) Reference and calling delete_ on it.
2022-03-27 19:50:09 +01:00
if (m_op == UnaryOp::Delete)
return generator.emit_delete_reference(m_lhs);
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Optional<ScopedOperand> src;
LibJS/Bytecode: Make typeof return "undefined" on unresolvable IDs Previously it would throw instead of returning "undefined" for `typeof Identifier` if Identifier does not exist.
2022-06-11 23:12:22 +01:00
// Typeof needs some special handling for when the LHS is an Identifier. Namely, it shouldn't throw on unresolvable references, but instead return "undefined".
if (m_op != UnaryOp::Typeof)
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
src = TRY(m_lhs->generate_bytecode(generator)).value();
auto dst = choose_dst(generator, preferred_dst);
LibJS: Add bytecode instructions for a bunch of unary operators ~, !, +, -, typeof, and void.
2021-06-07 19:53:47 +01:00
LibJS: Constant-fold unary expressions !0 and !1 are very common patterns in minified JavaScript, and we should figure out that they're constants. :^)
2025-03-25 18:01:35 +00:00
if (src.has_value() && src.value().operand().is_constant()) {
// OPTIMIZATION: Do some basic constant folding for unary operations on numbers.
auto value = generator.get_constant(*src);
if (auto result = constant_fold_unary_expression(generator, value, m_op); !result.is_error())
return result.release_value();
}
LibJS: Add bytecode instructions for a bunch of unary operators ~, !, +, -, typeof, and void.
2021-06-07 19:53:47 +01:00
switch (m_op) {
case UnaryOp::BitwiseNot:
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::BitwiseNot>(dst, *src);
LibJS: Introduce an accumulator register to Bytecode::Interpreter This commit introduces the concept of an accumulator register to LibJS's bytecode interpreter. The accumulator register is always register 0, and most simple instructions use it for reading and writing. Not only does this slim down the AST, but it also simplifies a lot of the code. For example, the generate_bytecode methods no longer need to return an Optional<Register>, as any opcode which has a "return" value will always put it into the accumulator. This also renames the old Op::Load to Op::LoadImmediate, and uses Op::Load to load from a register into the accumulator. There is also an Op::Store to put the value in the accumulator into another register.
2021-06-07 20:58:36 -07:00
break;
LibJS: Add bytecode instructions for a bunch of unary operators ~, !, +, -, typeof, and void.
2021-06-07 19:53:47 +01:00
case UnaryOp::Not:
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::Not>(dst, *src);
LibJS: Introduce an accumulator register to Bytecode::Interpreter This commit introduces the concept of an accumulator register to LibJS's bytecode interpreter. The accumulator register is always register 0, and most simple instructions use it for reading and writing. Not only does this slim down the AST, but it also simplifies a lot of the code. For example, the generate_bytecode methods no longer need to return an Optional<Register>, as any opcode which has a "return" value will always put it into the accumulator. This also renames the old Op::Load to Op::LoadImmediate, and uses Op::Load to load from a register into the accumulator. There is also an Op::Store to put the value in the accumulator into another register.
2021-06-07 20:58:36 -07:00
break;
LibJS: Add bytecode instructions for a bunch of unary operators ~, !, +, -, typeof, and void.
2021-06-07 19:53:47 +01:00
case UnaryOp::Plus:
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::UnaryPlus>(dst, *src);
LibJS: Introduce an accumulator register to Bytecode::Interpreter This commit introduces the concept of an accumulator register to LibJS's bytecode interpreter. The accumulator register is always register 0, and most simple instructions use it for reading and writing. Not only does this slim down the AST, but it also simplifies a lot of the code. For example, the generate_bytecode methods no longer need to return an Optional<Register>, as any opcode which has a "return" value will always put it into the accumulator. This also renames the old Op::Load to Op::LoadImmediate, and uses Op::Load to load from a register into the accumulator. There is also an Op::Store to put the value in the accumulator into another register.
2021-06-07 20:58:36 -07:00
break;
LibJS: Add bytecode instructions for a bunch of unary operators ~, !, +, -, typeof, and void.
2021-06-07 19:53:47 +01:00
case UnaryOp::Minus:
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::UnaryMinus>(dst, *src);
LibJS: Introduce an accumulator register to Bytecode::Interpreter This commit introduces the concept of an accumulator register to LibJS's bytecode interpreter. The accumulator register is always register 0, and most simple instructions use it for reading and writing. Not only does this slim down the AST, but it also simplifies a lot of the code. For example, the generate_bytecode methods no longer need to return an Optional<Register>, as any opcode which has a "return" value will always put it into the accumulator. This also renames the old Op::Load to Op::LoadImmediate, and uses Op::Load to load from a register into the accumulator. There is also an Op::Store to put the value in the accumulator into another register.
2021-06-07 20:58:36 -07:00
break;
LibJS: Add bytecode instructions for a bunch of unary operators ~, !, +, -, typeof, and void.
2021-06-07 19:53:47 +01:00
case UnaryOp::Typeof:
LibJS/Bytecode: Make typeof return "undefined" on unresolvable IDs Previously it would throw instead of returning "undefined" for `typeof Identifier` if Identifier does not exist.
2022-06-11 23:12:22 +01:00
if (is<Identifier>(*m_lhs)) {
auto& identifier = static_cast<Identifier const&>(*m_lhs);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
if (!identifier.is_local()) {
LibJS/Bytecode: Rename TypeofVariable => TypeofBinding
2024-06-14 09:37:26 +02:00
generator.emit<Bytecode::Op::TypeofBinding>(dst, generator.intern_identifier(identifier.string()));
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
break;
LibJS: Update bytecode generator to use local variables - Update ECMAScriptFunctionObject::function_declaration_instantiation to initialize local variables - Introduce GetLocal, SetLocal, TypeofLocal that will be used to operate on local variables. - Update bytecode generator to emit instructions for local variables
2023-07-05 02:17:10 +02:00
}
LibJS/Bytecode: Make typeof return "undefined" on unresolvable IDs Previously it would throw instead of returning "undefined" for `typeof Identifier` if Identifier does not exist.
2022-06-11 23:12:22 +01:00
}
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
src = TRY(m_lhs->generate_bytecode(generator)).value();
generator.emit<Bytecode::Op::Typeof>(dst, *src);
LibJS: Introduce an accumulator register to Bytecode::Interpreter This commit introduces the concept of an accumulator register to LibJS's bytecode interpreter. The accumulator register is always register 0, and most simple instructions use it for reading and writing. Not only does this slim down the AST, but it also simplifies a lot of the code. For example, the generate_bytecode methods no longer need to return an Optional<Register>, as any opcode which has a "return" value will always put it into the accumulator. This also renames the old Op::Load to Op::LoadImmediate, and uses Op::Load to load from a register into the accumulator. There is also an Op::Store to put the value in the accumulator into another register.
2021-06-07 20:58:36 -07:00
break;
LibJS: Add bytecode instructions for a bunch of unary operators ~, !, +, -, typeof, and void.
2021-06-07 19:53:47 +01:00
case UnaryOp::Void:
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return generator.add_constant(js_undefined());
LibJS/Bytecode: Implement the delete unary expression `delete` has to operate directly on Reference Records, so this introduces a new set of operations called DeleteByValue, DeleteVariable and DeleteById. They operate similarly to their Get counterparts, except they end in creating a (temporary) Reference and calling delete_ on it.
2022-03-27 19:50:09 +01:00
case UnaryOp::Delete: // Delete is implemented above.
LibJS: Add bytecode instructions for a bunch of unary operators ~, !, +, -, typeof, and void.
2021-06-07 19:53:47 +01:00
default:
LibJS/Bytecode: Implement the delete unary expression `delete` has to operate directly on Reference Records, so this introduces a new set of operations called DeleteByValue, DeleteVariable and DeleteById. They operate similarly to their Get counterparts, except they end in creating a (temporary) Reference and calling delete_ on it.
2022-03-27 19:50:09 +01:00
VERIFY_NOT_REACHED();
LibJS: Add bytecode instructions for a bunch of unary operators ~, !, +, -, typeof, and void.
2021-06-07 19:53:47 +01:00
}
LibJS: Make ASTNode::generate_bytecode() fallible Instead of crashing on the spot, return a descriptive error that will eventually continue its days as a javascript "InternalError" exception. This should make random crashes with BC less likely.
2022-02-12 19:54:08 +03:30
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return dst;
LibJS: Add bytecode instructions for a bunch of unary operators ~, !, +, -, typeof, and void.
2021-06-07 19:53:47 +01:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> NumericLiteral::generate_bytecode(Bytecode::Generator& generator, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS: Move AST bytecode generation virtuals to separate cpp file This will hopefully make it a bit more pleasant to edit this, as things will just get larger and larger.
2021-06-04 11:31:13 +02:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS/Bytecode: Make constant deduplication a bit smarter Instead of scanning through the list of seen constants, we now have a more structured storage of the constants true, false, null, undefined, and every possible Int32 value. This fixes an O(n^2) issue found by Kraken/json-stringify-tinderbox.js
2024-05-14 14:28:22 +02:00
return generator.add_constant(Value(m_value));
LibJS: Move AST bytecode generation virtuals to separate cpp file This will hopefully make it a bit more pleasant to edit this, as things will just get larger and larger.
2021-06-04 11:31:13 +02:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> BooleanLiteral::generate_bytecode(Bytecode::Generator& generator, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS: Add bytecode ops for loading boolean and null values
2021-06-07 20:22:15 +02:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return generator.add_constant(Value(m_value));
LibJS: Add bytecode ops for loading boolean and null values
2021-06-07 20:22:15 +02:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> NullLiteral::generate_bytecode(Bytecode::Generator& generator, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS: Add bytecode ops for loading boolean and null values
2021-06-07 20:22:15 +02:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return generator.add_constant(js_null());
LibJS: Add bytecode ops for loading boolean and null values
2021-06-07 20:22:15 +02:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> BigIntLiteral::generate_bytecode(Bytecode::Generator& generator, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS: Implement bytecode generation for BigInts
2021-06-08 07:59:25 +02:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS: Support non-base-10 BigInt literals in bytecode VM Fixes 39 tests in test262 and a handful in test-js. :^)
2022-10-19 19:17:58 +02:00
// 1. Return the NumericValue of NumericLiteral as defined in 12.8.3.
auto integer = [&] {
if (m_value[0] == '0' && m_value.length() >= 3)
if (m_value[1] == 'x' || m_value[1] == 'X')
LibCrypto: Make constructing a BigInteger from string fallible Previously, constructing a `UnsignedBigInteger::from_base()` could produce an incorrect result if the input string contained a valid Base36 digit that was out of range of the given base. The same method would also crash if the input string contained an invalid Base36 digit. An error is now returned in both these cases. Constructing a BigFraction from string is now also fallible, so that we can handle the case where we are given an input string with invalid digits.
2024-01-12 21:34:23 +00:00
return MUST(Crypto::SignedBigInteger::from_base(16, m_value.substring(2, m_value.length() - 3)));
LibJS: Support non-base-10 BigInt literals in bytecode VM Fixes 39 tests in test262 and a handful in test-js. :^)
2022-10-19 19:17:58 +02:00
if (m_value[1] == 'o' || m_value[1] == 'O')
LibCrypto: Make constructing a BigInteger from string fallible Previously, constructing a `UnsignedBigInteger::from_base()` could produce an incorrect result if the input string contained a valid Base36 digit that was out of range of the given base. The same method would also crash if the input string contained an invalid Base36 digit. An error is now returned in both these cases. Constructing a BigFraction from string is now also fallible, so that we can handle the case where we are given an input string with invalid digits.
2024-01-12 21:34:23 +00:00
return MUST(Crypto::SignedBigInteger::from_base(8, m_value.substring(2, m_value.length() - 3)));
LibJS: Support non-base-10 BigInt literals in bytecode VM Fixes 39 tests in test262 and a handful in test-js. :^)
2022-10-19 19:17:58 +02:00
if (m_value[1] == 'b' || m_value[1] == 'B')
LibCrypto: Make constructing a BigInteger from string fallible Previously, constructing a `UnsignedBigInteger::from_base()` could produce an incorrect result if the input string contained a valid Base36 digit that was out of range of the given base. The same method would also crash if the input string contained an invalid Base36 digit. An error is now returned in both these cases. Constructing a BigFraction from string is now also fallible, so that we can handle the case where we are given an input string with invalid digits.
2024-01-12 21:34:23 +00:00
return MUST(Crypto::SignedBigInteger::from_base(2, m_value.substring(2, m_value.length() - 3)));
return MUST(Crypto::SignedBigInteger::from_base(10, m_value.substring(0, m_value.length() - 1)));
LibJS: Support non-base-10 BigInt literals in bytecode VM Fixes 39 tests in test262 and a handful in test-js. :^)
2022-10-19 19:17:58 +02:00
}();
LibJS/Bytecode: Make constant deduplication a bit smarter Instead of scanning through the list of seen constants, we now have a more structured storage of the constants true, false, null, undefined, and every possible Int32 value. This fixes an O(n^2) issue found by Kraken/json-stringify-tinderbox.js
2024-05-14 14:28:22 +02:00
return generator.add_constant(BigInt::create(generator.vm(), move(integer)));
LibJS: Implement bytecode generation for BigInts
2021-06-08 07:59:25 +02:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> StringLiteral::generate_bytecode(Bytecode::Generator& generator, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS: Move AST bytecode generation virtuals to separate cpp file This will hopefully make it a bit more pleasant to edit this, as things will just get larger and larger.
2021-06-04 11:31:13 +02:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS/Bytecode: Make constant deduplication a bit smarter Instead of scanning through the list of seen constants, we now have a more structured storage of the constants true, false, null, undefined, and every possible Int32 value. This fixes an O(n^2) issue found by Kraken/json-stringify-tinderbox.js
2024-05-14 14:28:22 +02:00
return generator.add_constant(PrimitiveString::create(generator.vm(), m_value));
LibJS: Move AST bytecode generation virtuals to separate cpp file This will hopefully make it a bit more pleasant to edit this, as things will just get larger and larger.
2021-06-04 11:31:13 +02:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> RegExpLiteral::generate_bytecode(Bytecode::Generator& generator, Optional<ScopedOperand> preferred_dst) const
LibJS: Add bytecode support for regexp literals
2021-06-19 17:17:40 -07:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS: Add bytecode support for regexp literals
2021-06-19 17:17:40 -07:00
auto source_index = generator.intern_string(m_pattern);
auto flags_index = generator.intern_string(m_flags);
LibJS/Bytecode: Don't reparse regular expressions on instantiation The RegExpLiteral AST node already has the parsed regex::Parser::Result so let's plumb that over to the bytecode executable instead of reparsing the regex every time NewRegExp is executed. ~12% speed-up on language/literals/regexp/S7.8.5_A2.1_T2.js in test262.
2023-07-13 10:49:07 +02:00
auto regex_index = generator.intern_regex(Bytecode::ParsedRegex {
.regex = m_parsed_regex,
.pattern = m_parsed_pattern,
.flags = m_parsed_flags,
});
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto dst = choose_dst(generator, preferred_dst);
generator.emit<Bytecode::Op::NewRegExp>(dst, source_index, flags_index, regex_index);
return dst;
LibJS: Add bytecode support for regexp literals
2021-06-19 17:17:40 -07:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> Identifier::generate_bytecode(Bytecode::Generator& generator, Optional<ScopedOperand> preferred_dst) const
LibJS: Move AST bytecode generation virtuals to separate cpp file This will hopefully make it a bit more pleasant to edit this, as things will just get larger and larger.
2021-06-04 11:31:13 +02:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
if (is_local()) {
LibJS: Skip allocating locals for arguments that allowed to be local This allows us to get rid of instructions that move arguments to locals and allocate smaller JS::Value vector in ExecutionContext by reusing slots that were already allocated for arguments. With this change for following function: ```js function f(x, y) { return x + y; } ``` we now produce following bytecode: ``` [ 0] 0: Add dst:reg6, lhs:arg0, rhs:arg1 [ 10] Return value:reg6 ``` instead of: ``` [ 0] 0: GetArgument 0, dst:x~1 [ 10] GetArgument 1, dst:y~0 [ 20] Add dst:reg6, lhs:x~1, rhs:y~0 [ 30] Return value:reg6 ```
2025-04-25 17:10:47 +02:00
auto local_index = this->local_index();
auto local = generator.local(local_index);
if (!generator.is_local_initialized(local_index)) {
if (local_index.is_argument()) {
// Arguments are initialized to undefined by default, so here we need to replace it with the empty value to
// trigger the TDZ check.
generator.emit<Bytecode::Op::Mov>(local, generator.add_constant(js_special_empty_value()));
}
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::ThrowIfTDZ>(local);
}
return local;
}
LibJS/Bytecode: Don't emit `GetGlobal undefined` We know that `undefined` in the global scope is always the proper undefined value. This commit takes advantage of that by simply emitting a constant undefined value instead. Unfortunately we can't be so sure in other scopes.
2024-05-09 15:21:24 +02:00
if (is_global() && m_string == "undefined"sv) {
return generator.add_constant(js_undefined());
}
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto dst = choose_dst(generator, preferred_dst);
LibJS: Add optimized GetGlobal instruction to access global variables Using a special instruction to access global variables allows skipping the environment chain traversal for them and going directly to the module/global environment. Currently, this instruction only caches the offset for bindings that belong to the global object environment. However, there is also an opportunity to cache the offset in the global declarative record. This change results in a 57% increase in speed for imaging-gaussian-blur.js in Kraken.
2023-07-12 04:06:59 +02:00
if (is_global()) {
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::GetGlobal>(dst, generator.intern_identifier(m_string), generator.next_global_variable_cache());
LibJS: Update bytecode generator to use local variables - Update ECMAScriptFunctionObject::function_declaration_instantiation to initialize local variables - Introduce GetLocal, SetLocal, TypeofLocal that will be used to operate on local variables. - Update bytecode generator to emit instructions for local variables
2023-07-05 02:17:10 +02:00
} else {
LibJS/Bytecode: Rename GetVariable => GetBinding
2024-05-14 11:32:04 +02:00
generator.emit<Bytecode::Op::GetBinding>(dst, generator.intern_identifier(m_string));
LibJS: Update bytecode generator to use local variables - Update ECMAScriptFunctionObject::function_declaration_instantiation to initialize local variables - Introduce GetLocal, SetLocal, TypeofLocal that will be used to operate on local variables. - Update bytecode generator to emit instructions for local variables
2023-07-05 02:17:10 +02:00
}
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return dst;
LibJS: Move AST bytecode generation virtuals to separate cpp file This will hopefully make it a bit more pleasant to edit this, as things will just get larger and larger.
2021-06-04 11:31:13 +02:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
static Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> arguments_to_array_for_call(Bytecode::Generator& generator, ReadonlySpan<CallExpression::Argument> arguments)
LibJS: Handle argument spreading in the bytecode vm
2022-09-09 16:05:40 +02:00
{
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto dst = generator.allocate_register();
LibJS: Handle argument spreading in the bytecode vm
2022-09-09 16:05:40 +02:00
if (arguments.is_empty()) {
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::NewArray>(dst);
return dst;
LibJS: Handle argument spreading in the bytecode vm
2022-09-09 16:05:40 +02:00
}
auto first_spread = find_if(arguments.begin(), arguments.end(), [](auto el) { return el.is_spread; });
LibJS/Bytecode: Make NewArray a variable-length instruction This removes a layer of indirection in the bytecode where we had to make sure all the initializer elements were laid out in sequential registers. Array expressions no longer clobber registers permanently, and they can be reused immediately afterwards.
2024-05-08 12:43:08 +02:00
Vector<ScopedOperand> args;
args.ensure_capacity(first_spread.index());
LibJS: Handle argument spreading in the bytecode vm
2022-09-09 16:05:40 +02:00
for (auto it = arguments.begin(); it != first_spread; ++it) {
LibJS/Bytecode: Make NewArray a variable-length instruction This removes a layer of indirection in the bytecode where we had to make sure all the initializer elements were laid out in sequential registers. Array expressions no longer clobber registers permanently, and they can be reused immediately afterwards.
2024-05-08 12:43:08 +02:00
VERIFY(!it->is_spread);
auto reg = generator.allocate_register();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto value = TRY(it->value->generate_bytecode(generator)).value();
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(reg, value);
LibJS/Bytecode: Make NewArray a variable-length instruction This removes a layer of indirection in the bytecode where we had to make sure all the initializer elements were laid out in sequential registers. Array expressions no longer clobber registers permanently, and they can be reused immediately afterwards.
2024-05-08 12:43:08 +02:00
args.append(move(reg));
LibJS: Handle argument spreading in the bytecode vm
2022-09-09 16:05:40 +02:00
}
if (first_spread.index() != 0)
LibJS/Bytecode: Make NewArray a variable-length instruction This removes a layer of indirection in the bytecode where we had to make sure all the initializer elements were laid out in sequential registers. Array expressions no longer clobber registers permanently, and they can be reused immediately afterwards.
2024-05-08 12:43:08 +02:00
generator.emit_with_extra_operand_slots<Bytecode::Op::NewArray>(args.size(), dst, args);
LibJS: Handle argument spreading in the bytecode vm
2022-09-09 16:05:40 +02:00
else
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::NewArray>(dst);
LibJS: Handle argument spreading in the bytecode vm
2022-09-09 16:05:40 +02:00
if (first_spread != arguments.end()) {
for (auto it = first_spread; it != arguments.end(); ++it) {
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto value = TRY(it->value->generate_bytecode(generator)).value();
generator.emit<Bytecode::Op::ArrayAppend>(dst, value, it->is_spread);
LibJS: Handle argument spreading in the bytecode vm
2022-09-09 16:05:40 +02:00
}
}
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return dst;
LibJS: Handle argument spreading in the bytecode vm
2022-09-09 16:05:40 +02:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> SuperCall::generate_bytecode(Bytecode::Generator& generator, Optional<ScopedOperand> preferred_dst) const
LibJS: Implement SuperCall for the Bytecode-VM
2022-08-30 18:03:02 +02:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Optional<ScopedOperand> arguments;
LibJS: Implement SuperCall for the Bytecode-VM
2022-08-30 18:03:02 +02:00
if (m_is_synthetic == IsPartOfSyntheticConstructor::Yes) {
// NOTE: This is the case where we have a fake constructor(...args) { super(...args); } which
// shouldn't call @@iterator of %Array.prototype%.
VERIFY(m_arguments.size() == 1);
VERIFY(m_arguments[0].is_spread);
auto const& argument = m_arguments[0];
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
// This generates a single argument.
arguments = MUST(argument.value->generate_bytecode(generator));
LibJS: Implement SuperCall for the Bytecode-VM
2022-08-30 18:03:02 +02:00
} else {
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
arguments = TRY(arguments_to_array_for_call(generator, m_arguments)).value();
LibJS: Implement SuperCall for the Bytecode-VM
2022-08-30 18:03:02 +02:00
}
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto dst = choose_dst(generator, preferred_dst);
generator.emit<Bytecode::Op::SuperCallWithArgumentArray>(dst, *arguments, m_is_synthetic == IsPartOfSyntheticConstructor::Yes);
return dst;
LibJS: Implement SuperCall for the Bytecode-VM
2022-08-30 18:03:02 +02:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> AssignmentExpression::generate_bytecode(Bytecode::Generator& generator, Optional<ScopedOperand> preferred_dst) const
LibJS: Move AST bytecode generation virtuals to separate cpp file This will hopefully make it a bit more pleasant to edit this, as things will just get larger and larger.
2021-06-04 11:31:13 +02:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS: Support more assignment expressions in the bytecode VM Use the new reference get/put helpers in BytecodeGenerator to support assignment expressions other than just plain assignment.
2021-10-25 15:29:52 +02:00
if (m_op == AssignmentOp::Assignment) {
LibJS/Bytecode: Evaluate LHS of assignment before RHS We had the same issue with the AST interpreter, see issue #3689.
2022-07-17 19:23:52 +01:00
// AssignmentExpression : LeftHandSideExpression = AssignmentExpression
return m_lhs.visit(
// 1. If LeftHandSideExpression is neither an ObjectLiteral nor an ArrayLiteral, then
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
[&](NonnullRefPtr<Expression const> const& lhs) -> Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> {
LibJS/Bytecode: Evaluate LHS of assignment before RHS We had the same issue with the AST interpreter, see issue #3689.
2022-07-17 19:23:52 +01:00
// a. Let lref be the result of evaluating LeftHandSideExpression.
// b. ReturnIfAbrupt(lref).
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Optional<ScopedOperand> base;
Optional<ScopedOperand> computed_property;
Optional<ScopedOperand> this_value;
LibJS/Bytecode: Use proper `this` for receiver in get/set for super expr Summary: Diff Tests: +14 ✅ -2 ❌ -12 📝
2023-07-02 19:26:31 +01:00
bool lhs_is_super_expression = false;
LibJS/Bytecode: Evaluate LHS of assignment before RHS We had the same issue with the AST interpreter, see issue #3689.
2022-07-17 19:23:52 +01:00
if (is<MemberExpression>(*lhs)) {
auto& expression = static_cast<MemberExpression const&>(*lhs);
LibJS/Bytecode: Use proper `this` for receiver in get/set for super expr Summary: Diff Tests: +14 ✅ -2 ❌ -12 📝
2023-07-02 19:26:31 +01:00
lhs_is_super_expression = is<SuperExpression>(expression.object());
if (!lhs_is_super_expression) {
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
base = TRY(expression.object().generate_bytecode(generator)).value();
LibJS/Bytecode: Use proper `this` for receiver in get/set for super expr Summary: Diff Tests: +14 ✅ -2 ❌ -12 📝
2023-07-02 19:26:31 +01:00
} else {
// https://tc39.es/ecma262/#sec-super-keyword-runtime-semantics-evaluation
// 1. Let env be GetThisEnvironment().
// 2. Let actualThis be ? env.GetThisBinding().
LibJS/Bytecode: Only emit ResolveThisBinding once per basic block Once executed, this instruction will always produce the same result in subsequent executions, so it's okay to cache it. Unfortunately it may throw, so we can't just hoist it to the top of every executable, since that would break observable execution order.
2024-05-07 12:16:37 +02:00
this_value = generator.get_this();
LibJS/Bytecode: Use proper `this` for receiver in get/set for super expr Summary: Diff Tests: +14 ✅ -2 ❌ -12 📝
2023-07-02 19:26:31 +01:00
// SuperProperty : super [ Expression ]
// 3. Let propertyNameReference be ? Evaluation of Expression.
// 4. Let propertyNameValue be ? GetValue(propertyNameReference).
}
LibJS/Bytecode: Evaluate LHS of assignment before RHS We had the same issue with the AST interpreter, see issue #3689.
2022-07-17 19:23:52 +01:00
if (expression.is_computed()) {
LibJS/Bytecode: Always evaluate LHS first in assignment expressions This fixes an issue where expressions like `a[i] = a[++i]` could evaluate `++i` before `a[i]`.
2024-03-05 09:48:13 +01:00
auto property = TRY(expression.property().generate_bytecode(generator)).value();
LibJS/Bytecode: Add and use copy_if_needed_to_preserve_evaluation_order This is a new Bytecode::Generator helper that takes an operand and returns the same operand, or a copy of it, in case a copy is required to preserve correct evaluation order. This can be used in a bunch of places where we're worried about clobbering some value after obtaining it. Practically, locals are always copied, and temporary registers as well as constants are returned as-is.
2024-06-01 10:00:32 +02:00
computed_property = generator.copy_if_needed_to_preserve_evaluation_order(property);
LibJS/Bytecode: Evaluate LHS of assignment before RHS We had the same issue with the AST interpreter, see issue #3689.
2022-07-17 19:23:52 +01:00
// To be continued later with PutByValue.
} else if (expression.property().is_identifier()) {
// Do nothing, this will be handled by PutById later.
LibJS/Bytecode: Support private class fields This is accomplished with two new instructions: - GetPrivateById - PutPrivateById Looks like 1616 new passes on test262. :^)
2023-06-23 08:16:17 +02:00
} else if (expression.property().is_private_identifier()) {
// Do nothing, this will be handled by PutPrivateById later.
LibJS/Bytecode: Evaluate LHS of assignment before RHS We had the same issue with the AST interpreter, see issue #3689.
2022-07-17 19:23:52 +01:00
} else {
return Bytecode::CodeGenerationError {
&expression,
"Unimplemented non-computed member expression"sv
};
}
LibJS/Bytecode: Use proper `this` for receiver in get/set for super expr Summary: Diff Tests: +14 ✅ -2 ❌ -12 📝
2023-07-02 19:26:31 +01:00
if (lhs_is_super_expression) {
// 5/7. Return ? MakeSuperPropertyReference(actualThis, propertyKey, strict).
// https://tc39.es/ecma262/#sec-makesuperpropertyreference
// 1. Let env be GetThisEnvironment().
// 2. Assert: env.HasSuperBinding() is true.
// 3. Let baseValue be ? env.GetSuperBase().
// 4. Return the Reference Record { [[Base]]: baseValue, [[ReferencedName]]: propertyKey, [[Strict]]: strict, [[ThisValue]]: actualThis }.
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
base = generator.allocate_register();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::ResolveSuperBase>(*base);
LibJS/Bytecode: Use proper `this` for receiver in get/set for super expr Summary: Diff Tests: +14 ✅ -2 ❌ -12 📝
2023-07-02 19:26:31 +01:00
}
LibJS/Bytecode: Evaluate LHS of assignment before RHS We had the same issue with the AST interpreter, see issue #3689.
2022-07-17 19:23:52 +01:00
} else if (is<Identifier>(*lhs)) {
LibJS/Bytecode: Rename GetVariable => GetBinding
2024-05-14 11:32:04 +02:00
// NOTE: For Identifiers, we cannot perform GetBinding and then write into the reference it retrieves, only SetVariable can do this.
LibJS/Bytecode: Evaluate LHS of assignment before RHS We had the same issue with the AST interpreter, see issue #3689.
2022-07-17 19:23:52 +01:00
// FIXME: However, this breaks spec as we are doing variable lookup after evaluating the RHS. This is observable in an object environment, where we visibly perform HasOwnProperty and Get(@@unscopables) on the binded object.
} else {
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
(void)TRY(lhs->generate_bytecode(generator));
LibJS/Bytecode: Evaluate LHS of assignment before RHS We had the same issue with the AST interpreter, see issue #3689.
2022-07-17 19:23:52 +01:00
}
// FIXME: c. If IsAnonymousFunctionDefinition(AssignmentExpression) and IsIdentifierRef of LeftHandSideExpression are both true, then
// i. Let rval be ? NamedEvaluation of AssignmentExpression with argument lref.[[ReferencedName]].
// d. Else,
// i. Let rref be the result of evaluating AssignmentExpression.
// ii. Let rval be ? GetValue(rref).
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto rval = TRY([&]() -> Bytecode::CodeGenerationErrorOr<ScopedOperand> {
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
if (lhs->is_identifier()) {
return TRY(generator.emit_named_evaluation_if_anonymous_function(*m_rhs, generator.intern_identifier(static_cast<Identifier const&>(*lhs).string()))).value();
} else {
return TRY(m_rhs->generate_bytecode(generator)).value();
}
}());
LibJS/Bytecode: Evaluate LHS of assignment before RHS We had the same issue with the AST interpreter, see issue #3689.
2022-07-17 19:23:52 +01:00
// e. Perform ? PutValue(lref, rval).
if (is<Identifier>(*lhs)) {
auto& identifier = static_cast<Identifier const&>(*lhs);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit_set_variable(identifier, rval);
LibJS/Bytecode: Evaluate LHS of assignment before RHS We had the same issue with the AST interpreter, see issue #3689.
2022-07-17 19:23:52 +01:00
} else if (is<MemberExpression>(*lhs)) {
auto& expression = static_cast<MemberExpression const&>(*lhs);
LibJS: Include identifier information in nullish property write access When a PutById / PutByValue bytecode operation results in accessing a nullish object, we now include the name of the property and the object being accessed in the exception message (if available). This should make it easier to debug live websites. For example, the following errors would all previously produce a generic error message of "ToObject on null or undefined": > foo = null > foo.bar = 1 Uncaught exception: [TypeError] Cannot access property "bar" on null object "foo" at <unknown> > foo = { bar: undefined } > foo.bar.baz = 1 Uncaught exception: [TypeError] Cannot access property "baz" on undefined object "foo.bar" at <unknown> Note we certainly don't capture all possible nullish property write accesses here. This just covers cases I've seen most on live websites; we can cover more cases as they arise.
2024-03-29 12:10:52 -04:00
auto base_identifier = generator.intern_identifier_for_expression(expression.object());
LibJS/Bytecode: Evaluate LHS of assignment before RHS We had the same issue with the AST interpreter, see issue #3689.
2022-07-17 19:23:52 +01:00
if (expression.is_computed()) {
LibJS/Bytecode: Use proper `this` for receiver in get/set for super expr Summary: Diff Tests: +14 ✅ -2 ❌ -12 📝
2023-07-02 19:26:31 +01:00
if (!lhs_is_super_expression)
LibJS: Emit PutById instead of PutByValue when key is string literal Basically convert o["foo"]=x into o.foo=x when emitting bytecode. These are effectively the same thing, and the latter format opts into using an inline cache for the property lookups.
2025-04-03 14:29:44 +02:00
generator.emit_put_by_value(*base, *computed_property, rval, Bytecode::Op::PropertyKind::KeyValue, move(base_identifier));
LibJS/Bytecode: Use proper `this` for receiver in get/set for super expr Summary: Diff Tests: +14 ✅ -2 ❌ -12 📝
2023-07-02 19:26:31 +01:00
else
LibJS: Emit PutById instead of PutByValue when key is string literal Basically convert o["foo"]=x into o.foo=x when emitting bytecode. These are effectively the same thing, and the latter format opts into using an inline cache for the property lookups.
2025-04-03 14:29:44 +02:00
generator.emit_put_by_value_with_this(*base, *computed_property, *this_value, rval, Op::PropertyKind::KeyValue);
LibJS/Bytecode: Evaluate LHS of assignment before RHS We had the same issue with the AST interpreter, see issue #3689.
2022-07-17 19:23:52 +01:00
} else if (expression.property().is_identifier()) {
AK+Everywhere: Rename `verify_cast` to `as` Follow-up to fc20e61e7249006247b43f84a3189d5a37fa103e.
2025-01-21 09:12:05 -05:00
auto identifier_table_ref = generator.intern_identifier(as<Identifier>(expression.property()).string());
LibJS/Bytecode: Use proper `this` for receiver in get/set for super expr Summary: Diff Tests: +14 ✅ -2 ❌ -12 📝
2023-07-02 19:26:31 +01:00
if (!lhs_is_super_expression)
LibJS: Include identifier information in nullish property write access When a PutById / PutByValue bytecode operation results in accessing a nullish object, we now include the name of the property and the object being accessed in the exception message (if available). This should make it easier to debug live websites. For example, the following errors would all previously produce a generic error message of "ToObject on null or undefined": > foo = null > foo.bar = 1 Uncaught exception: [TypeError] Cannot access property "bar" on null object "foo" at <unknown> > foo = { bar: undefined } > foo.bar.baz = 1 Uncaught exception: [TypeError] Cannot access property "baz" on undefined object "foo.bar" at <unknown> Note we certainly don't capture all possible nullish property write accesses here. This just covers cases I've seen most on live websites; we can cover more cases as they arise.
2024-03-29 12:10:52 -04:00
generator.emit<Bytecode::Op::PutById>(*base, identifier_table_ref, rval, Bytecode::Op::PropertyKind::KeyValue, generator.next_property_lookup_cache(), move(base_identifier));
LibJS/Bytecode: Use proper `this` for receiver in get/set for super expr Summary: Diff Tests: +14 ✅ -2 ❌ -12 📝
2023-07-02 19:26:31 +01:00
else
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::PutByIdWithThis>(*base, *this_value, identifier_table_ref, rval, Bytecode::Op::PropertyKind::KeyValue, generator.next_property_lookup_cache());
LibJS/Bytecode: Support private class fields This is accomplished with two new instructions: - GetPrivateById - PutPrivateById Looks like 1616 new passes on test262. :^)
2023-06-23 08:16:17 +02:00
} else if (expression.property().is_private_identifier()) {
AK+Everywhere: Rename `verify_cast` to `as` Follow-up to fc20e61e7249006247b43f84a3189d5a37fa103e.
2025-01-21 09:12:05 -05:00
auto identifier_table_ref = generator.intern_identifier(as<PrivateIdentifier>(expression.property()).string());
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::PutPrivateById>(*base, identifier_table_ref, rval);
LibJS/Bytecode: Evaluate LHS of assignment before RHS We had the same issue with the AST interpreter, see issue #3689.
2022-07-17 19:23:52 +01:00
} else {
return Bytecode::CodeGenerationError {
&expression,
"Unimplemented non-computed member expression"sv
};
}
} else {
return Bytecode::CodeGenerationError {
lhs,
"Unimplemented/invalid node used a reference"sv
};
}
// f. Return rval.
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return rval;
LibJS/Bytecode: Evaluate LHS of assignment before RHS We had the same issue with the AST interpreter, see issue #3689.
2022-07-17 19:23:52 +01:00
},
// 2. Let assignmentPattern be the AssignmentPattern that is covered by LeftHandSideExpression.
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
[&](NonnullRefPtr<BindingPattern const> const& pattern) -> Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> {
LibJS/Bytecode: Implement destructuring assignment
2022-07-17 19:24:37 +01:00
// 3. Let rref be the result of evaluating AssignmentExpression.
// 4. Let rval be ? GetValue(rref).
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto rval = TRY(m_rhs->generate_bytecode(generator)).value();
LibJS/Bytecode: Implement destructuring assignment
2022-07-17 19:24:37 +01:00
// 5. Perform ? DestructuringAssignmentEvaluation of assignmentPattern with argument rval.
LibJS: Delete create_variable param in BindingPattern::generate_bytecode It's no longer used, because we assume that caller of this function has already taken care of variable creation and initialization.
2025-04-22 00:33:54 +02:00
TRY(pattern->generate_bytecode(generator, Bytecode::Op::BindingInitializationMode::Set, rval));
LibJS/Bytecode: Implement destructuring assignment
2022-07-17 19:24:37 +01:00
// 6. Return rval.
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return rval;
LibJS/Bytecode: Evaluate LHS of assignment before RHS We had the same issue with the AST interpreter, see issue #3689.
2022-07-17 19:23:52 +01:00
});
LibJS: Support more assignment expressions in the bytecode VM Use the new reference get/put helpers in BytecodeGenerator to support assignment expressions other than just plain assignment.
2021-10-25 15:29:52 +02:00
}
LibJS: Add support for various assignment operators
2021-06-07 20:12:38 +01:00
LibJS: Make RefPtr and NonnullRefPtr usage const-correct This mainly affected the AST, which is now const throughout.
2023-02-19 22:07:52 +01:00
VERIFY(m_lhs.has<NonnullRefPtr<Expression const>>());
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto& lhs_expression = m_lhs.get<NonnullRefPtr<Expression const>>();
LibJS/Bytecode: Evaluate LHS of assignment before RHS We had the same issue with the AST interpreter, see issue #3689.
2022-07-17 19:23:52 +01:00
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto reference_operands = TRY(generator.emit_load_from_reference(lhs_expression));
auto lhs = reference_operands.loaded_value.value();
LibJS: Add support for various assignment operators
2021-06-07 20:12:38 +01:00
LibJS: Support more assignment expressions in the bytecode VM Use the new reference get/put helpers in BytecodeGenerator to support assignment expressions other than just plain assignment.
2021-10-25 15:29:52 +02:00
Bytecode::BasicBlock* rhs_block_ptr { nullptr };
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
Bytecode::BasicBlock* lhs_block_ptr { nullptr };
LibJS: Support more assignment expressions in the bytecode VM Use the new reference get/put helpers in BytecodeGenerator to support assignment expressions other than just plain assignment.
2021-10-25 15:29:52 +02:00
Bytecode::BasicBlock* end_block_ptr { nullptr };
LibJS: Add support for various assignment operators
2021-06-07 20:12:38 +01:00
LibJS: Support more assignment expressions in the bytecode VM Use the new reference get/put helpers in BytecodeGenerator to support assignment expressions other than just plain assignment.
2021-10-25 15:29:52 +02:00
// Logical assignments short circuit.
if (m_op == AssignmentOp::AndAssignment) { // &&=
rhs_block_ptr = &generator.make_block();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
lhs_block_ptr = &generator.make_block();
LibJS: Support more assignment expressions in the bytecode VM Use the new reference get/put helpers in BytecodeGenerator to support assignment expressions other than just plain assignment.
2021-10-25 15:29:52 +02:00
end_block_ptr = &generator.make_block();
LibJS: Add logical assignment bytecode generation
2021-06-09 21:14:31 +01:00
LibJS/Bytecode: Do basic compare-and-jump peephole optimization We now fuse sequences like [LessThan, JumpIf] to JumpLessThan. This is only allowed for temporaries (i.e VM registers) with no other references to them.
2024-05-09 15:13:31 +02:00
generator.emit_jump_if(
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
lhs,
LibJS: Support more assignment expressions in the bytecode VM Use the new reference get/put helpers in BytecodeGenerator to support assignment expressions other than just plain assignment.
2021-10-25 15:29:52 +02:00
Bytecode::Label { *rhs_block_ptr },
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
Bytecode::Label { *lhs_block_ptr });
LibJS: Support more assignment expressions in the bytecode VM Use the new reference get/put helpers in BytecodeGenerator to support assignment expressions other than just plain assignment.
2021-10-25 15:29:52 +02:00
} else if (m_op == AssignmentOp::OrAssignment) { // ||=
rhs_block_ptr = &generator.make_block();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
lhs_block_ptr = &generator.make_block();
LibJS: Support more assignment expressions in the bytecode VM Use the new reference get/put helpers in BytecodeGenerator to support assignment expressions other than just plain assignment.
2021-10-25 15:29:52 +02:00
end_block_ptr = &generator.make_block();
LibJS: Add logical assignment bytecode generation
2021-06-09 21:14:31 +01:00
LibJS/Bytecode: Do basic compare-and-jump peephole optimization We now fuse sequences like [LessThan, JumpIf] to JumpLessThan. This is only allowed for temporaries (i.e VM registers) with no other references to them.
2024-05-09 15:13:31 +02:00
generator.emit_jump_if(
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
lhs,
Bytecode::Label { *lhs_block_ptr },
LibJS: Support more assignment expressions in the bytecode VM Use the new reference get/put helpers in BytecodeGenerator to support assignment expressions other than just plain assignment.
2021-10-25 15:29:52 +02:00
Bytecode::Label { *rhs_block_ptr });
} else if (m_op == AssignmentOp::NullishAssignment) { // ??=
rhs_block_ptr = &generator.make_block();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
lhs_block_ptr = &generator.make_block();
LibJS: Support more assignment expressions in the bytecode VM Use the new reference get/put helpers in BytecodeGenerator to support assignment expressions other than just plain assignment.
2021-10-25 15:29:52 +02:00
end_block_ptr = &generator.make_block();
LibJS: Remove almost all uses of Op::Jump::set_targets() We should initialize jump targets when constructing the jump instruction instead of doing it later. This was already the case in all construction sites but one. This first patch converts all those sites to pass final targets to the constructor directly.
2023-09-28 12:43:11 +02:00
generator.emit<Bytecode::Op::JumpNullish>(
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
lhs,
LibJS: Support more assignment expressions in the bytecode VM Use the new reference get/put helpers in BytecodeGenerator to support assignment expressions other than just plain assignment.
2021-10-25 15:29:52 +02:00
Bytecode::Label { *rhs_block_ptr },
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
Bytecode::Label { *lhs_block_ptr });
LibJS: Move AST bytecode generation virtuals to separate cpp file This will hopefully make it a bit more pleasant to edit this, as things will just get larger and larger.
2021-06-04 11:31:13 +02:00
}
LibJS: Support more assignment expressions in the bytecode VM Use the new reference get/put helpers in BytecodeGenerator to support assignment expressions other than just plain assignment.
2021-10-25 15:29:52 +02:00
if (rhs_block_ptr)
generator.switch_to_basic_block(*rhs_block_ptr);
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto rhs = TRY([&]() -> Bytecode::CodeGenerationErrorOr<ScopedOperand> {
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
if (lhs_expression->is_identifier()) {
return TRY(generator.emit_named_evaluation_if_anonymous_function(*m_rhs, generator.intern_identifier(static_cast<Identifier const&>(*lhs_expression).string()))).value();
}
return TRY(m_rhs->generate_bytecode(generator)).value();
}());
LibJS/Bytecode: Use LHS identifier as function name on logical assign This now creates a function named `x`: x ||= function() { } 9 new passes on test262. :^)
2023-06-26 15:26:46 +02:00
LibJS/Bytecode: Allow assignment expression to write directly to locals
2024-05-14 13:15:14 +02:00
// OPTIMIZATION: If LHS is a local, we can write the result directly into it.
auto dst = [&] {
if (lhs.operand().is_local())
return lhs;
return choose_dst(generator, preferred_dst);
}();
LibJS: Support more assignment expressions in the bytecode VM Use the new reference get/put helpers in BytecodeGenerator to support assignment expressions other than just plain assignment.
2021-10-25 15:29:52 +02:00
switch (m_op) {
case AssignmentOp::AdditionAssignment:
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::Add>(dst, lhs, rhs);
LibJS: Support more assignment expressions in the bytecode VM Use the new reference get/put helpers in BytecodeGenerator to support assignment expressions other than just plain assignment.
2021-10-25 15:29:52 +02:00
break;
case AssignmentOp::SubtractionAssignment:
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::Sub>(dst, lhs, rhs);
LibJS: Support more assignment expressions in the bytecode VM Use the new reference get/put helpers in BytecodeGenerator to support assignment expressions other than just plain assignment.
2021-10-25 15:29:52 +02:00
break;
case AssignmentOp::MultiplicationAssignment:
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::Mul>(dst, lhs, rhs);
LibJS: Support more assignment expressions in the bytecode VM Use the new reference get/put helpers in BytecodeGenerator to support assignment expressions other than just plain assignment.
2021-10-25 15:29:52 +02:00
break;
case AssignmentOp::DivisionAssignment:
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::Div>(dst, lhs, rhs);
LibJS: Support more assignment expressions in the bytecode VM Use the new reference get/put helpers in BytecodeGenerator to support assignment expressions other than just plain assignment.
2021-10-25 15:29:52 +02:00
break;
case AssignmentOp::ModuloAssignment:
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::Mod>(dst, lhs, rhs);
LibJS: Support more assignment expressions in the bytecode VM Use the new reference get/put helpers in BytecodeGenerator to support assignment expressions other than just plain assignment.
2021-10-25 15:29:52 +02:00
break;
case AssignmentOp::ExponentiationAssignment:
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::Exp>(dst, lhs, rhs);
LibJS: Support more assignment expressions in the bytecode VM Use the new reference get/put helpers in BytecodeGenerator to support assignment expressions other than just plain assignment.
2021-10-25 15:29:52 +02:00
break;
case AssignmentOp::BitwiseAndAssignment:
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::BitwiseAnd>(dst, lhs, rhs);
LibJS: Support more assignment expressions in the bytecode VM Use the new reference get/put helpers in BytecodeGenerator to support assignment expressions other than just plain assignment.
2021-10-25 15:29:52 +02:00
break;
case AssignmentOp::BitwiseOrAssignment:
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::BitwiseOr>(dst, lhs, rhs);
LibJS: Support more assignment expressions in the bytecode VM Use the new reference get/put helpers in BytecodeGenerator to support assignment expressions other than just plain assignment.
2021-10-25 15:29:52 +02:00
break;
case AssignmentOp::BitwiseXorAssignment:
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::BitwiseXor>(dst, lhs, rhs);
LibJS: Support more assignment expressions in the bytecode VM Use the new reference get/put helpers in BytecodeGenerator to support assignment expressions other than just plain assignment.
2021-10-25 15:29:52 +02:00
break;
case AssignmentOp::LeftShiftAssignment:
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::LeftShift>(dst, lhs, rhs);
LibJS: Support more assignment expressions in the bytecode VM Use the new reference get/put helpers in BytecodeGenerator to support assignment expressions other than just plain assignment.
2021-10-25 15:29:52 +02:00
break;
case AssignmentOp::RightShiftAssignment:
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::RightShift>(dst, lhs, rhs);
LibJS: Support more assignment expressions in the bytecode VM Use the new reference get/put helpers in BytecodeGenerator to support assignment expressions other than just plain assignment.
2021-10-25 15:29:52 +02:00
break;
case AssignmentOp::UnsignedRightShiftAssignment:
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::UnsignedRightShift>(dst, lhs, rhs);
LibJS: Support more assignment expressions in the bytecode VM Use the new reference get/put helpers in BytecodeGenerator to support assignment expressions other than just plain assignment.
2021-10-25 15:29:52 +02:00
break;
case AssignmentOp::AndAssignment:
case AssignmentOp::OrAssignment:
case AssignmentOp::NullishAssignment:
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(dst, rhs);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
break;
LibJS: Support more assignment expressions in the bytecode VM Use the new reference get/put helpers in BytecodeGenerator to support assignment expressions other than just plain assignment.
2021-10-25 15:29:52 +02:00
default:
LibJS: Make ASTNode::generate_bytecode() fallible Instead of crashing on the spot, return a descriptive error that will eventually continue its days as a javascript "InternalError" exception. This should make random crashes with BC less likely.
2022-02-12 19:54:08 +03:30
return Bytecode::CodeGenerationError {
this,
"Unimplemented operation"sv,
};
LibJS: Add PutById bytecode instruction for object property assignment Note that this is only used for non-computed accesses. Computed access is not yet implemented. :^)
2021-06-04 20:47:07 +02:00
}
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
if (lhs_expression->is_identifier())
generator.emit_set_variable(static_cast<Identifier const&>(*lhs_expression), dst);
LibJS: Don't evaluate computed MemberExpression LHS twice in assignments The following snippet would cause "i" to be incremented twice(!): let a = [] let i = 0 a[++i] += 0 This patch solves the issue by remembering the base object and property name for computed MemberExpression LHS in codegen. We the store the result of the assignment to the same object and property (instead of computing the LHS again). 3 new passes on test262. :^)
2023-10-04 15:22:07 +02:00
else
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
(void)TRY(generator.emit_store_to_reference(reference_operands, dst));
LibJS: Support more assignment expressions in the bytecode VM Use the new reference get/put helpers in BytecodeGenerator to support assignment expressions other than just plain assignment.
2021-10-25 15:29:52 +02:00
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
if (rhs_block_ptr) {
generator.emit<Bytecode::Op::Jump>(Bytecode::Label { *end_block_ptr });
}
if (lhs_block_ptr) {
generator.switch_to_basic_block(*lhs_block_ptr);
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(dst, lhs);
LibJS: Remove almost all uses of Op::Jump::set_targets() We should initialize jump targets when constructing the jump instruction instead of doing it later. This was already the case in all construction sites but one. This first patch converts all those sites to pass final targets to the constructor directly.
2023-09-28 12:43:11 +02:00
generator.emit<Bytecode::Op::Jump>(Bytecode::Label { *end_block_ptr });
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
}
if (end_block_ptr) {
LibJS: Support more assignment expressions in the bytecode VM Use the new reference get/put helpers in BytecodeGenerator to support assignment expressions other than just plain assignment.
2021-10-25 15:29:52 +02:00
generator.switch_to_basic_block(*end_block_ptr);
}
LibJS: Make ASTNode::generate_bytecode() fallible Instead of crashing on the spot, return a descriptive error that will eventually continue its days as a javascript "InternalError" exception. This should make random crashes with BC less likely.
2022-02-12 19:54:08 +03:30
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return dst;
LibJS: Move AST bytecode generation virtuals to separate cpp file This will hopefully make it a bit more pleasant to edit this, as things will just get larger and larger.
2021-06-04 11:31:13 +02:00
}
LibJS/Bytecode: Implement break/continue labels This is done by keeping track of all the labels that apply to a given break/continue scope alongside their bytecode target. When a break/continue with a label is generated, we scan from the most inner scope to the most outer scope looking for the label, performing any necessary unwinds on the way. Once the label is found, it is then jumped to.
2022-06-11 23:09:37 +01:00
// 14.13.3 Runtime Semantics: Evaluation, https://tc39.es/ecma262/#sec-labelled-statements-runtime-semantics-evaluation
// LabelledStatement : LabelIdentifier : LabelledItem
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> LabelledStatement::generate_bytecode(Bytecode::Generator& generator, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS/Bytecode: Implement break/continue labels This is done by keeping track of all the labels that apply to a given break/continue scope alongside their bytecode target. When a break/continue with a label is generated, we scan from the most inner scope to the most outer scope looking for the label, performing any necessary unwinds on the way. Once the label is found, it is then jumped to.
2022-06-11 23:09:37 +01:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS/Bytecode: Implement break/continue labels This is done by keeping track of all the labels that apply to a given break/continue scope alongside their bytecode target. When a break/continue with a label is generated, we scan from the most inner scope to the most outer scope looking for the label, performing any necessary unwinds on the way. Once the label is found, it is then jumped to.
2022-06-11 23:09:37 +01:00
// Return ? LabelledEvaluation of this LabelledStatement with argument « ».
return generate_labelled_evaluation(generator, {});
}
// 14.13.4 Runtime Semantics: LabelledEvaluation, https://tc39.es/ecma262/#sec-runtime-semantics-labelledevaluation
// LabelledStatement : LabelIdentifier : LabelledItem
LibJS: Use FlyString in PropertyKey instead of DeprecatedFlyString This required dealing with *substantial* fallout.
2025-03-18 18:08:02 -05:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> LabelledStatement::generate_labelled_evaluation(Bytecode::Generator& generator, Vector<FlyString> const& label_set, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS/Bytecode: Implement break/continue labels This is done by keeping track of all the labels that apply to a given break/continue scope alongside their bytecode target. When a break/continue with a label is generated, we scan from the most inner scope to the most outer scope looking for the label, performing any necessary unwinds on the way. Once the label is found, it is then jumped to.
2022-06-11 23:09:37 +01:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS/Bytecode: Implement break/continue labels This is done by keeping track of all the labels that apply to a given break/continue scope alongside their bytecode target. When a break/continue with a label is generated, we scan from the most inner scope to the most outer scope looking for the label, performing any necessary unwinds on the way. Once the label is found, it is then jumped to.
2022-06-11 23:09:37 +01:00
// Convert the m_labelled_item NNRP to a reference early so we don't have to do it every single time we want to use it.
auto const& labelled_item = *m_labelled_item;
// 1. Let label be the StringValue of LabelIdentifier.
// NOTE: Not necessary, this is m_label.
// 2. Let newLabelSet be the list-concatenation of labelSet and « label ».
// FIXME: Avoid copy here.
auto new_label_set = label_set;
new_label_set.append(m_label);
// 3. Let stmtResult be LabelledEvaluation of LabelledItem with argument newLabelSet.
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Optional<ScopedOperand> stmt_result;
LibJS/Bytecode: Implement break/continue labels This is done by keeping track of all the labels that apply to a given break/continue scope alongside their bytecode target. When a break/continue with a label is generated, we scan from the most inner scope to the most outer scope looking for the label, performing any necessary unwinds on the way. Once the label is found, it is then jumped to.
2022-06-11 23:09:37 +01:00
if (is<IterationStatement>(labelled_item)) {
auto const& iteration_statement = static_cast<IterationStatement const&>(labelled_item);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
stmt_result = TRY(iteration_statement.generate_labelled_evaluation(generator, new_label_set));
LibJS/Bytecode: Implement break/continue labels This is done by keeping track of all the labels that apply to a given break/continue scope alongside their bytecode target. When a break/continue with a label is generated, we scan from the most inner scope to the most outer scope looking for the label, performing any necessary unwinds on the way. Once the label is found, it is then jumped to.
2022-06-11 23:09:37 +01:00
} else if (is<SwitchStatement>(labelled_item)) {
auto const& switch_statement = static_cast<SwitchStatement const&>(labelled_item);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
stmt_result = TRY(switch_statement.generate_labelled_evaluation(generator, new_label_set));
LibJS/Bytecode: Implement break/continue labels This is done by keeping track of all the labels that apply to a given break/continue scope alongside their bytecode target. When a break/continue with a label is generated, we scan from the most inner scope to the most outer scope looking for the label, performing any necessary unwinds on the way. Once the label is found, it is then jumped to.
2022-06-11 23:09:37 +01:00
} else if (is<LabelledStatement>(labelled_item)) {
auto const& labelled_statement = static_cast<LabelledStatement const&>(labelled_item);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
stmt_result = TRY(labelled_statement.generate_labelled_evaluation(generator, new_label_set));
LibJS/Bytecode: Implement break/continue labels This is done by keeping track of all the labels that apply to a given break/continue scope alongside their bytecode target. When a break/continue with a label is generated, we scan from the most inner scope to the most outer scope looking for the label, performing any necessary unwinds on the way. Once the label is found, it is then jumped to.
2022-06-11 23:09:37 +01:00
} else {
auto& labelled_break_block = generator.make_block();
// NOTE: We do not need a continuable scope as `continue;` is not allowed outside of iteration statements, throwing a SyntaxError in the parser.
generator.begin_breakable_scope(Bytecode::Label { labelled_break_block }, new_label_set);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
stmt_result = TRY(labelled_item.generate_bytecode(generator));
LibJS/Bytecode: Implement break/continue labels This is done by keeping track of all the labels that apply to a given break/continue scope alongside their bytecode target. When a break/continue with a label is generated, we scan from the most inner scope to the most outer scope looking for the label, performing any necessary unwinds on the way. Once the label is found, it is then jumped to.
2022-06-11 23:09:37 +01:00
generator.end_breakable_scope();
if (!generator.is_current_block_terminated()) {
LibJS: Remove almost all uses of Op::Jump::set_targets() We should initialize jump targets when constructing the jump instruction instead of doing it later. This was already the case in all construction sites but one. This first patch converts all those sites to pass final targets to the constructor directly.
2023-09-28 12:43:11 +02:00
generator.emit<Bytecode::Op::Jump>(Bytecode::Label { labelled_break_block });
LibJS/Bytecode: Implement break/continue labels This is done by keeping track of all the labels that apply to a given break/continue scope alongside their bytecode target. When a break/continue with a label is generated, we scan from the most inner scope to the most outer scope looking for the label, performing any necessary unwinds on the way. Once the label is found, it is then jumped to.
2022-06-11 23:09:37 +01:00
}
generator.switch_to_basic_block(labelled_break_block);
}
// 4. If stmtResult.[[Type]] is break and SameValue(stmtResult.[[Target]], label) is true, then
// a. Set stmtResult to NormalCompletion(stmtResult.[[Value]]).
// NOTE: These steps are performed by making labelled break jump straight to the appropriate break block, which preserves the statement result's value in the accumulator.
// 5. Return Completion(stmtResult).
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return stmt_result;
LibJS/Bytecode: Implement break/continue labels This is done by keeping track of all the labels that apply to a given break/continue scope alongside their bytecode target. When a break/continue with a label is generated, we scan from the most inner scope to the most outer scope looking for the label, performing any necessary unwinds on the way. Once the label is found, it is then jumped to.
2022-06-11 23:09:37 +01:00
}
LibJS: Use FlyString in PropertyKey instead of DeprecatedFlyString This required dealing with *substantial* fallout.
2025-03-18 18:08:02 -05:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> IterationStatement::generate_labelled_evaluation(Bytecode::Generator&, Vector<FlyString> const&, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS/Bytecode: Implement break/continue labels This is done by keeping track of all the labels that apply to a given break/continue scope alongside their bytecode target. When a break/continue with a label is generated, we scan from the most inner scope to the most outer scope looking for the label, performing any necessary unwinds on the way. Once the label is found, it is then jumped to.
2022-06-11 23:09:37 +01:00
{
return Bytecode::CodeGenerationError {
this,
"Missing generate_labelled_evaluation()"sv,
};
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> WhileStatement::generate_bytecode(Bytecode::Generator& generator, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS/Bytecode: Implement break/continue labels This is done by keeping track of all the labels that apply to a given break/continue scope alongside their bytecode target. When a break/continue with a label is generated, we scan from the most inner scope to the most outer scope looking for the label, performing any necessary unwinds on the way. Once the label is found, it is then jumped to.
2022-06-11 23:09:37 +01:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS/Bytecode: Implement break/continue labels This is done by keeping track of all the labels that apply to a given break/continue scope alongside their bytecode target. When a break/continue with a label is generated, we scan from the most inner scope to the most outer scope looking for the label, performing any necessary unwinds on the way. Once the label is found, it is then jumped to.
2022-06-11 23:09:37 +01:00
return generate_labelled_evaluation(generator, {});
}
LibJS: Use FlyString in PropertyKey instead of DeprecatedFlyString This required dealing with *substantial* fallout.
2025-03-18 18:08:02 -05:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> WhileStatement::generate_labelled_evaluation(Bytecode::Generator& generator, Vector<FlyString> const& label_set, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS: Add basic support for while loops in the bytecode engine This introduces two new instructions: Jump and JumpIfFalse. Jumps are made to a Bytecode::Label, which is a simple object that represents a location in the bytecode stream. Note that you may not always know the target of a jump when adding the jump instruction itself, but we can just update the instruction later on during codegen once we know where the jump target is. The Bytecode::Interpreter now implements jumping via a jump slot that gets checked after each instruction to see if a jump is pending. If not, we just increment the PC as usual.
2021-06-04 12:07:38 +02:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS: Generate bytecode in basic blocks instead of one big block This limits the size of each block (currently set to 1K), and gets us closer to a canonical, more easily analysable bytecode format. As a result of this, "Labels" are now simply entries to basic blocks. Since there is no more 'conditional' jump (as all jumps are always taken), JumpIf{True,False} are unified to JumpConditional, and JumpIfNullish is renamed to JumpNullish. Also fixes #7914 as a result of reimplementing the loop logic.
2021-06-09 06:49:58 +04:30
// test
// jump if_false (true) end (false) body
// body
// jump always (true) test
// end
auto& test_block = generator.make_block();
auto& body_block = generator.make_block();
auto& end_block = generator.make_block();
LibJS/Bytecode: Don't bother propagating completion values in functions The last completion value in a function is not exposed to the language, since functions always either return something, or undefined. Given this, we can avoid emitting code that propagates the completion value from various statements, as long as we know we're generating code for a context where the completion value is not accessible. In practical terms, this means that function code gets to do less completion shuffling, while global and eval code has to keep doing it.
2024-05-14 10:57:06 +02:00
Optional<ScopedOperand> completion;
if (generator.must_propagate_completion()) {
completion = generator.allocate_register();
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(*completion, generator.add_constant(js_undefined()));
LibJS/Bytecode: Don't bother propagating completion values in functions The last completion value in a function is not exposed to the language, since functions always either return something, or undefined. Given this, we can avoid emitting code that propagates the completion value from various statements, as long as we know we're generating code for a context where the completion value is not accessible. In practical terms, this means that function code gets to do less completion shuffling, while global and eval code has to keep doing it.
2024-05-14 10:57:06 +02:00
}
LibJS: Generate bytecode in basic blocks instead of one big block This limits the size of each block (currently set to 1K), and gets us closer to a canonical, more easily analysable bytecode format. As a result of this, "Labels" are now simply entries to basic blocks. Since there is no more 'conditional' jump (as all jumps are always taken), JumpIf{True,False} are unified to JumpConditional, and JumpIfNullish is renamed to JumpNullish. Also fixes #7914 as a result of reimplementing the loop logic.
2021-06-09 06:49:58 +04:30
LibJS: Remove almost all uses of Op::Jump::set_targets() We should initialize jump targets when constructing the jump instruction instead of doing it later. This was already the case in all construction sites but one. This first patch converts all those sites to pass final targets to the constructor directly.
2023-09-28 12:43:11 +02:00
generator.emit<Bytecode::Op::Jump>(Bytecode::Label { test_block });
LibJS: Generate bytecode in basic blocks instead of one big block This limits the size of each block (currently set to 1K), and gets us closer to a canonical, more easily analysable bytecode format. As a result of this, "Labels" are now simply entries to basic blocks. Since there is no more 'conditional' jump (as all jumps are always taken), JumpIf{True,False} are unified to JumpConditional, and JumpIfNullish is renamed to JumpNullish. Also fixes #7914 as a result of reimplementing the loop logic.
2021-06-09 06:49:58 +04:30
generator.switch_to_basic_block(test_block);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto test = TRY(m_test->generate_bytecode(generator)).value();
LibJS/Bytecode: Do basic compare-and-jump peephole optimization We now fuse sequences like [LessThan, JumpIf] to JumpLessThan. This is only allowed for temporaries (i.e VM registers) with no other references to them.
2024-05-09 15:13:31 +02:00
generator.emit_jump_if(
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
test,
LibJS: Generate bytecode in basic blocks instead of one big block This limits the size of each block (currently set to 1K), and gets us closer to a canonical, more easily analysable bytecode format. As a result of this, "Labels" are now simply entries to basic blocks. Since there is no more 'conditional' jump (as all jumps are always taken), JumpIf{True,False} are unified to JumpConditional, and JumpIfNullish is renamed to JumpNullish. Also fixes #7914 as a result of reimplementing the loop logic.
2021-06-09 06:49:58 +04:30
Bytecode::Label { body_block },
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
Bytecode::Label { end_block });
LibJS: Generate bytecode in basic blocks instead of one big block This limits the size of each block (currently set to 1K), and gets us closer to a canonical, more easily analysable bytecode format. As a result of this, "Labels" are now simply entries to basic blocks. Since there is no more 'conditional' jump (as all jumps are always taken), JumpIf{True,False} are unified to JumpConditional, and JumpIfNullish is renamed to JumpNullish. Also fixes #7914 as a result of reimplementing the loop logic.
2021-06-09 06:49:58 +04:30
generator.switch_to_basic_block(body_block);
LibJS/Bytecode: Implement break/continue labels This is done by keeping track of all the labels that apply to a given break/continue scope alongside their bytecode target. When a break/continue with a label is generated, we scan from the most inner scope to the most outer scope looking for the label, performing any necessary unwinds on the way. Once the label is found, it is then jumped to.
2022-06-11 23:09:37 +01:00
generator.begin_continuable_scope(Bytecode::Label { test_block }, label_set);
generator.begin_breakable_scope(Bytecode::Label { end_block }, label_set);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto body = TRY(m_body->generate_bytecode(generator));
LibJS/Bytecode: Unconditionally end break/continuable scopes Previously we would only end these scopes if the block was not terminated. If the block was generated, we would not end the scope and would generate other bytecode with these scopes still open. These functions do not generate any code, so they can be used even if the current block is terminated. The enter and end scope functions are only used to track where to unwind to when break/continue are used.
2022-03-14 02:13:33 +00:00
generator.end_breakable_scope();
generator.end_continuable_scope();
LibJS: Don't generate code after we've encountered a terminating op
2021-06-09 19:57:18 +02:00
if (!generator.is_current_block_terminated()) {
LibJS/Bytecode: Don't bother propagating completion values in functions The last completion value in a function is not exposed to the language, since functions always either return something, or undefined. Given this, we can avoid emitting code that propagates the completion value from various statements, as long as we know we're generating code for a context where the completion value is not accessible. In practical terms, this means that function code gets to do less completion shuffling, while global and eval code has to keep doing it.
2024-05-14 10:57:06 +02:00
if (generator.must_propagate_completion()) {
if (body.has_value())
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(*completion, body.value());
LibJS/Bytecode: Don't bother propagating completion values in functions The last completion value in a function is not exposed to the language, since functions always either return something, or undefined. Given this, we can avoid emitting code that propagates the completion value from various statements, as long as we know we're generating code for a context where the completion value is not accessible. In practical terms, this means that function code gets to do less completion shuffling, while global and eval code has to keep doing it.
2024-05-14 10:57:06 +02:00
}
LibJS: Remove almost all uses of Op::Jump::set_targets() We should initialize jump targets when constructing the jump instruction instead of doing it later. This was already the case in all construction sites but one. This first patch converts all those sites to pass final targets to the constructor directly.
2023-09-28 12:43:11 +02:00
generator.emit<Bytecode::Op::Jump>(Bytecode::Label { test_block });
LibJS: Don't generate code after we've encountered a terminating op
2021-06-09 19:57:18 +02:00
}
LibJS: Make ASTNode::generate_bytecode() fallible Instead of crashing on the spot, return a descriptive error that will eventually continue its days as a javascript "InternalError" exception. This should make random crashes with BC less likely.
2022-02-12 19:54:08 +03:30
LibJS/Bytecode: Return the proper result for iteration statements
2023-06-25 20:52:35 +01:00
generator.switch_to_basic_block(end_block);
LibJS/Bytecode: Don't bother propagating completion values in functions The last completion value in a function is not exposed to the language, since functions always either return something, or undefined. Given this, we can avoid emitting code that propagates the completion value from various statements, as long as we know we're generating code for a context where the completion value is not accessible. In practical terms, this means that function code gets to do less completion shuffling, while global and eval code has to keep doing it.
2024-05-14 10:57:06 +02:00
return completion;
LibJS: Add basic support for while loops in the bytecode engine This introduces two new instructions: Jump and JumpIfFalse. Jumps are made to a Bytecode::Label, which is a simple object that represents a location in the bytecode stream. Note that you may not always know the target of a jump when adding the jump instruction itself, but we can just update the instruction later on during codegen once we know where the jump target is. The Bytecode::Interpreter now implements jumping via a jump slot that gets checked after each instruction to see if a jump is pending. If not, we just increment the PC as usual.
2021-06-04 12:07:38 +02:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> DoWhileStatement::generate_bytecode(Bytecode::Generator& generator, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS/Bytecode: Implement break/continue labels This is done by keeping track of all the labels that apply to a given break/continue scope alongside their bytecode target. When a break/continue with a label is generated, we scan from the most inner scope to the most outer scope looking for the label, performing any necessary unwinds on the way. Once the label is found, it is then jumped to.
2022-06-11 23:09:37 +01:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS/Bytecode: Implement break/continue labels This is done by keeping track of all the labels that apply to a given break/continue scope alongside their bytecode target. When a break/continue with a label is generated, we scan from the most inner scope to the most outer scope looking for the label, performing any necessary unwinds on the way. Once the label is found, it is then jumped to.
2022-06-11 23:09:37 +01:00
return generate_labelled_evaluation(generator, {});
}
LibJS: Use FlyString in PropertyKey instead of DeprecatedFlyString This required dealing with *substantial* fallout.
2025-03-18 18:08:02 -05:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> DoWhileStatement::generate_labelled_evaluation(Bytecode::Generator& generator, Vector<FlyString> const& label_set, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS: Generate bytecode for do...while statements :^) This was quite straightforward using the same label/jump machinery that we added for while statements. The main addition here is a new JumpIfTrue bytecode instruction.
2021-06-04 12:20:44 +02:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS: Generate bytecode in basic blocks instead of one big block This limits the size of each block (currently set to 1K), and gets us closer to a canonical, more easily analysable bytecode format. As a result of this, "Labels" are now simply entries to basic blocks. Since there is no more 'conditional' jump (as all jumps are always taken), JumpIf{True,False} are unified to JumpConditional, and JumpIfNullish is renamed to JumpNullish. Also fixes #7914 as a result of reimplementing the loop logic.
2021-06-09 06:49:58 +04:30
// jump always (true) body
// test
// jump if_false (true) end (false) body
// body
// jump always (true) test
// end
auto& body_block = generator.make_block();
LibJS/Bytecode: Emit `do...while` body before test in codegen This makes the code flow naturally and allows jump elision to work.
2024-05-06 13:38:08 +02:00
auto& test_block = generator.make_block();
LibJS/Bytecode: Return the proper result for iteration statements
2023-06-25 20:52:35 +01:00
auto& load_result_and_jump_to_end_block = generator.make_block();
LibJS: Generate bytecode in basic blocks instead of one big block This limits the size of each block (currently set to 1K), and gets us closer to a canonical, more easily analysable bytecode format. As a result of this, "Labels" are now simply entries to basic blocks. Since there is no more 'conditional' jump (as all jumps are always taken), JumpIf{True,False} are unified to JumpConditional, and JumpIfNullish is renamed to JumpNullish. Also fixes #7914 as a result of reimplementing the loop logic.
2021-06-09 06:49:58 +04:30
auto& end_block = generator.make_block();
LibJS/Bytecode: Don't bother propagating completion values in functions The last completion value in a function is not exposed to the language, since functions always either return something, or undefined. Given this, we can avoid emitting code that propagates the completion value from various statements, as long as we know we're generating code for a context where the completion value is not accessible. In practical terms, this means that function code gets to do less completion shuffling, while global and eval code has to keep doing it.
2024-05-14 10:57:06 +02:00
Optional<ScopedOperand> completion;
if (generator.must_propagate_completion()) {
completion = generator.allocate_register();
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(*completion, generator.add_constant(js_undefined()));
LibJS/Bytecode: Don't bother propagating completion values in functions The last completion value in a function is not exposed to the language, since functions always either return something, or undefined. Given this, we can avoid emitting code that propagates the completion value from various statements, as long as we know we're generating code for a context where the completion value is not accessible. In practical terms, this means that function code gets to do less completion shuffling, while global and eval code has to keep doing it.
2024-05-14 10:57:06 +02:00
}
LibJS: Generate bytecode in basic blocks instead of one big block This limits the size of each block (currently set to 1K), and gets us closer to a canonical, more easily analysable bytecode format. As a result of this, "Labels" are now simply entries to basic blocks. Since there is no more 'conditional' jump (as all jumps are always taken), JumpIf{True,False} are unified to JumpConditional, and JumpIfNullish is renamed to JumpNullish. Also fixes #7914 as a result of reimplementing the loop logic.
2021-06-09 06:49:58 +04:30
// jump to the body block
LibJS: Remove almost all uses of Op::Jump::set_targets() We should initialize jump targets when constructing the jump instruction instead of doing it later. This was already the case in all construction sites but one. This first patch converts all those sites to pass final targets to the constructor directly.
2023-09-28 12:43:11 +02:00
generator.emit<Bytecode::Op::Jump>(Bytecode::Label { body_block });
LibJS: Generate bytecode in basic blocks instead of one big block This limits the size of each block (currently set to 1K), and gets us closer to a canonical, more easily analysable bytecode format. As a result of this, "Labels" are now simply entries to basic blocks. Since there is no more 'conditional' jump (as all jumps are always taken), JumpIf{True,False} are unified to JumpConditional, and JumpIfNullish is renamed to JumpNullish. Also fixes #7914 as a result of reimplementing the loop logic.
2021-06-09 06:49:58 +04:30
generator.switch_to_basic_block(test_block);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto test = TRY(m_test->generate_bytecode(generator)).value();
LibJS/Bytecode: Do basic compare-and-jump peephole optimization We now fuse sequences like [LessThan, JumpIf] to JumpLessThan. This is only allowed for temporaries (i.e VM registers) with no other references to them.
2024-05-09 15:13:31 +02:00
generator.emit_jump_if(
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
test,
LibJS: Generate bytecode in basic blocks instead of one big block This limits the size of each block (currently set to 1K), and gets us closer to a canonical, more easily analysable bytecode format. As a result of this, "Labels" are now simply entries to basic blocks. Since there is no more 'conditional' jump (as all jumps are always taken), JumpIf{True,False} are unified to JumpConditional, and JumpIfNullish is renamed to JumpNullish. Also fixes #7914 as a result of reimplementing the loop logic.
2021-06-09 06:49:58 +04:30
Bytecode::Label { body_block },
LibJS/Bytecode: Return the proper result for iteration statements
2023-06-25 20:52:35 +01:00
Bytecode::Label { load_result_and_jump_to_end_block });
LibJS: Generate bytecode in basic blocks instead of one big block This limits the size of each block (currently set to 1K), and gets us closer to a canonical, more easily analysable bytecode format. As a result of this, "Labels" are now simply entries to basic blocks. Since there is no more 'conditional' jump (as all jumps are always taken), JumpIf{True,False} are unified to JumpConditional, and JumpIfNullish is renamed to JumpNullish. Also fixes #7914 as a result of reimplementing the loop logic.
2021-06-09 06:49:58 +04:30
generator.switch_to_basic_block(body_block);
LibJS/Bytecode: Implement break/continue labels This is done by keeping track of all the labels that apply to a given break/continue scope alongside their bytecode target. When a break/continue with a label is generated, we scan from the most inner scope to the most outer scope looking for the label, performing any necessary unwinds on the way. Once the label is found, it is then jumped to.
2022-06-11 23:09:37 +01:00
generator.begin_continuable_scope(Bytecode::Label { test_block }, label_set);
generator.begin_breakable_scope(Bytecode::Label { end_block }, label_set);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto body_result = TRY(m_body->generate_bytecode(generator));
LibJS/Bytecode: Unconditionally end break/continuable scopes Previously we would only end these scopes if the block was not terminated. If the block was generated, we would not end the scope and would generate other bytecode with these scopes still open. These functions do not generate any code, so they can be used even if the current block is terminated. The enter and end scope functions are only used to track where to unwind to when break/continue are used.
2022-03-14 02:13:33 +00:00
generator.end_breakable_scope();
generator.end_continuable_scope();
LibJS: Don't generate code after we've encountered a terminating op
2021-06-09 19:57:18 +02:00
if (!generator.is_current_block_terminated()) {
LibJS/Bytecode: Don't bother propagating completion values in functions The last completion value in a function is not exposed to the language, since functions always either return something, or undefined. Given this, we can avoid emitting code that propagates the completion value from various statements, as long as we know we're generating code for a context where the completion value is not accessible. In practical terms, this means that function code gets to do less completion shuffling, while global and eval code has to keep doing it.
2024-05-14 10:57:06 +02:00
if (generator.must_propagate_completion()) {
if (body_result.has_value())
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(*completion, body_result.value());
LibJS/Bytecode: Don't bother propagating completion values in functions The last completion value in a function is not exposed to the language, since functions always either return something, or undefined. Given this, we can avoid emitting code that propagates the completion value from various statements, as long as we know we're generating code for a context where the completion value is not accessible. In practical terms, this means that function code gets to do less completion shuffling, while global and eval code has to keep doing it.
2024-05-14 10:57:06 +02:00
}
LibJS: Remove almost all uses of Op::Jump::set_targets() We should initialize jump targets when constructing the jump instruction instead of doing it later. This was already the case in all construction sites but one. This first patch converts all those sites to pass final targets to the constructor directly.
2023-09-28 12:43:11 +02:00
generator.emit<Bytecode::Op::Jump>(Bytecode::Label { test_block });
LibJS: Don't generate code after we've encountered a terminating op
2021-06-09 19:57:18 +02:00
}
LibJS: Make ASTNode::generate_bytecode() fallible Instead of crashing on the spot, return a descriptive error that will eventually continue its days as a javascript "InternalError" exception. This should make random crashes with BC less likely.
2022-02-12 19:54:08 +03:30
LibJS/Bytecode: Return the proper result for iteration statements
2023-06-25 20:52:35 +01:00
generator.switch_to_basic_block(load_result_and_jump_to_end_block);
generator.emit<Bytecode::Op::Jump>(Bytecode::Label { end_block });
generator.switch_to_basic_block(end_block);
LibJS/Bytecode: Don't bother propagating completion values in functions The last completion value in a function is not exposed to the language, since functions always either return something, or undefined. Given this, we can avoid emitting code that propagates the completion value from various statements, as long as we know we're generating code for a context where the completion value is not accessible. In practical terms, this means that function code gets to do less completion shuffling, while global and eval code has to keep doing it.
2024-05-14 10:57:06 +02:00
return completion;
LibJS: Generate bytecode for do...while statements :^) This was quite straightforward using the same label/jump machinery that we added for while statements. The main addition here is a new JumpIfTrue bytecode instruction.
2021-06-04 12:20:44 +02:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> ForStatement::generate_bytecode(Bytecode::Generator& generator, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS/Bytecode: Implement break/continue labels This is done by keeping track of all the labels that apply to a given break/continue scope alongside their bytecode target. When a break/continue with a label is generated, we scan from the most inner scope to the most outer scope looking for the label, performing any necessary unwinds on the way. Once the label is found, it is then jumped to.
2022-06-11 23:09:37 +01:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS/Bytecode: Implement break/continue labels This is done by keeping track of all the labels that apply to a given break/continue scope alongside their bytecode target. When a break/continue with a label is generated, we scan from the most inner scope to the most outer scope looking for the label, performing any necessary unwinds on the way. Once the label is found, it is then jumped to.
2022-06-11 23:09:37 +01:00
return generate_labelled_evaluation(generator, {});
}
LibJS: Use FlyString in PropertyKey instead of DeprecatedFlyString This required dealing with *substantial* fallout.
2025-03-18 18:08:02 -05:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> ForStatement::generate_labelled_evaluation(Bytecode::Generator& generator, Vector<FlyString> const& label_set, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS: Add for loop bytecode generation
2021-06-08 10:54:40 +01:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS: Generate bytecode in basic blocks instead of one big block This limits the size of each block (currently set to 1K), and gets us closer to a canonical, more easily analysable bytecode format. As a result of this, "Labels" are now simply entries to basic blocks. Since there is no more 'conditional' jump (as all jumps are always taken), JumpIf{True,False} are unified to JumpConditional, and JumpIfNullish is renamed to JumpNullish. Also fixes #7914 as a result of reimplementing the loop logic.
2021-06-09 06:49:58 +04:30
// init
// jump always (true) test
// test
// jump if_true (true) body (false) end
// body
// jump always (true) update
// update
// jump always (true) test
// end
// If 'test' is missing, fuse the 'test' and 'body' basic blocks
// If 'update' is missing, fuse the 'body' and 'update' basic blocks
Bytecode::BasicBlock* test_block_ptr { nullptr };
Bytecode::BasicBlock* body_block_ptr { nullptr };
Bytecode::BasicBlock* update_block_ptr { nullptr };
LibJS/Bytecode: Setup declarative environment for lexical for statements
2022-03-14 02:39:24 +00:00
bool has_lexical_environment = false;
LibJS: Implement CreatePerIterationEnvironment for 'for' statements Implement for CreatePerIterationEnvironment for 'for' loops per the Ecma Standard. This ensures each iteration of a 'for' loop has its own lexical environment so that variables declared in the loop are scoped to the current iteration.
2024-07-16 16:56:02 -04:00
Vector<IdentifierTableIndex> per_iteration_bindings;
LibJS/Bytecode: Setup declarative environment for lexical for statements
2022-03-14 02:39:24 +00:00
if (m_init) {
if (m_init->is_variable_declaration()) {
AK+Everywhere: Rename `verify_cast` to `as` Follow-up to fc20e61e7249006247b43f84a3189d5a37fa103e.
2025-01-21 09:12:05 -05:00
auto& variable_declaration = as<VariableDeclaration>(*m_init);
LibJS/Bytecode: Setup declarative environment for lexical for statements
2022-03-14 02:39:24 +00:00
LibJS/Bytecode: Skip CreateVariable for locals in "for" loop head CreateVariable is not needed for locals because they are not stored in environment and created binding will not be used. Also if all variables in loop initialization sections are local then CreateLexicalEnvironment and LeaveLexicalEnvironment can also be ommitted.
2023-07-13 21:30:36 +02:00
auto has_non_local_variables = false;
MUST(variable_declaration.for_each_bound_identifier([&](auto const& identifier) {
if (!identifier.is_local())
has_non_local_variables = true;
}));
if (variable_declaration.is_lexical_declaration() && has_non_local_variables) {
LibJS/Bytecode: Setup declarative environment for lexical for statements
2022-03-14 02:39:24 +00:00
has_lexical_environment = true;
LibJS: Implement CreatePerIterationEnvironment for 'for' statements Implement for CreatePerIterationEnvironment for 'for' loops per the Ecma Standard. This ensures each iteration of a 'for' loop has its own lexical environment so that variables declared in the loop are scoped to the current iteration.
2024-07-16 16:56:02 -04:00
// Setup variable scope for bound identifiers
LibJS/Bytecode: Leave BlockDeclarationInstantiation in C++ Instead of implementing this AO in bytecode, we now have an instruction for it that simply invokes the C++ implementation. This allows us to simplify Bytecode::Generator quite a bit by removing all the variable scope tracking.
2023-06-16 16:34:47 +02:00
generator.begin_variable_scope();
LibJS/Bytecode: Setup declarative environment for lexical for statements
2022-03-14 02:39:24 +00:00
bool is_const = variable_declaration.is_constant_declaration();
LibJS: Don't discard ThrowCompletionOr<void> from declaration iteration
2023-02-27 22:13:37 +00:00
// NOTE: Nothing in the callback throws an exception.
LibJS/Bytecode: Skip CreateVariable for locals in "for" loop head CreateVariable is not needed for locals because they are not stored in environment and created binding will not be used. Also if all variables in loop initialization sections are local then CreateLexicalEnvironment and LeaveLexicalEnvironment can also be ommitted.
2023-07-13 21:30:36 +02:00
MUST(variable_declaration.for_each_bound_identifier([&](auto const& identifier) {
if (identifier.is_local())
return;
auto index = generator.intern_identifier(identifier.string());
LibJS/Bytecode: Setup declarative environment for lexical for statements
2022-03-14 02:39:24 +00:00
generator.emit<Bytecode::Op::CreateVariable>(index, Bytecode::Op::EnvironmentMode::Lexical, is_const);
LibJS: Implement CreatePerIterationEnvironment for 'for' statements Implement for CreatePerIterationEnvironment for 'for' loops per the Ecma Standard. This ensures each iteration of a 'for' loop has its own lexical environment so that variables declared in the loop are scoped to the current iteration.
2024-07-16 16:56:02 -04:00
if (!is_const) {
per_iteration_bindings.append(index);
}
LibJS: Don't discard ThrowCompletionOr<void> from declaration iteration
2023-02-27 22:13:37 +00:00
}));
LibJS/Bytecode: Setup declarative environment for lexical for statements
2022-03-14 02:39:24 +00:00
}
}
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
(void)TRY(m_init->generate_bytecode(generator));
LibJS/Bytecode: Setup declarative environment for lexical for statements
2022-03-14 02:39:24 +00:00
}
LibJS: Introduce an accumulator register to Bytecode::Interpreter This commit introduces the concept of an accumulator register to LibJS's bytecode interpreter. The accumulator register is always register 0, and most simple instructions use it for reading and writing. Not only does this slim down the AST, but it also simplifies a lot of the code. For example, the generate_bytecode methods no longer need to return an Optional<Register>, as any opcode which has a "return" value will always put it into the accumulator. This also renames the old Op::Load to Op::LoadImmediate, and uses Op::Load to load from a register into the accumulator. There is also an Op::Store to put the value in the accumulator into another register.
2021-06-07 20:58:36 -07:00
LibJS: Implement CreatePerIterationEnvironment for 'for' statements Implement for CreatePerIterationEnvironment for 'for' loops per the Ecma Standard. This ensures each iteration of a 'for' loop has its own lexical environment so that variables declared in the loop are scoped to the current iteration.
2024-07-16 16:56:02 -04:00
// CreatePerIterationEnvironment (https://tc39.es/ecma262/multipage/ecmascript-language-statements-and-declarations.html#sec-createperiterationenvironment)
auto generate_per_iteration_bindings = [&per_iteration_bindings = static_cast<Vector<IdentifierTableIndex> const&>(per_iteration_bindings),
&generator]() {
if (per_iteration_bindings.is_empty()) {
return;
}
// Copy all the last values into registers for use in step 1.e.iii
// Register copies of bindings are required since the changing of the
// running execution context in the final step requires leaving the
// current variable scope before creating "thisIterationEnv"
Vector<ScopedOperand> registers;
for (auto const& binding : per_iteration_bindings) {
auto reg = generator.allocate_register();
generator.emit<Bytecode::Op::GetBinding>(reg, binding);
registers.append(reg);
}
generator.end_variable_scope();
generator.begin_variable_scope();
for (size_t i = 0; i < per_iteration_bindings.size(); ++i) {
generator.emit<Bytecode::Op::CreateVariable>(per_iteration_bindings[i], Bytecode::Op::EnvironmentMode::Lexical, false);
generator.emit<Bytecode::Op::InitializeLexicalBinding>(per_iteration_bindings[i], registers[i]);
}
};
LibJS: Fix crash in bytecode generator on https://twinings.co.uk/ If the current block has already been terminated, we should just skip creating a per-iteration environment.
2024-07-24 10:35:39 +02:00
if (m_init) {
// CreatePerIterationEnvironment where lastIterationEnv is the variable
// scope created above for bound identifiers
generate_per_iteration_bindings();
}
LibJS: Generate bytecode in basic blocks instead of one big block This limits the size of each block (currently set to 1K), and gets us closer to a canonical, more easily analysable bytecode format. As a result of this, "Labels" are now simply entries to basic blocks. Since there is no more 'conditional' jump (as all jumps are always taken), JumpIf{True,False} are unified to JumpConditional, and JumpIfNullish is renamed to JumpNullish. Also fixes #7914 as a result of reimplementing the loop logic.
2021-06-09 06:49:58 +04:30
body_block_ptr = &generator.make_block();
if (m_update)
update_block_ptr = &generator.make_block();
else
update_block_ptr = body_block_ptr;
LibJS/Bytecode: Emit `for` condition check before update statement This allows jump elision to eliminate an unnecessary jump since things now get laid out naturally in memory (normal execution order).
2024-05-06 09:34:42 +02:00
if (m_test)
test_block_ptr = &generator.make_block();
else
test_block_ptr = body_block_ptr;
LibJS/Bytecode: Put end block last in `for` statement codegen
2024-05-06 10:10:38 +02:00
auto& end_block = generator.make_block();
LibJS: Remove almost all uses of Op::Jump::set_targets() We should initialize jump targets when constructing the jump instruction instead of doing it later. This was already the case in all construction sites but one. This first patch converts all those sites to pass final targets to the constructor directly.
2023-09-28 12:43:11 +02:00
generator.emit<Bytecode::Op::Jump>(Bytecode::Label { *test_block_ptr });
LibJS: Generate bytecode in basic blocks instead of one big block This limits the size of each block (currently set to 1K), and gets us closer to a canonical, more easily analysable bytecode format. As a result of this, "Labels" are now simply entries to basic blocks. Since there is no more 'conditional' jump (as all jumps are always taken), JumpIf{True,False} are unified to JumpConditional, and JumpIfNullish is renamed to JumpNullish. Also fixes #7914 as a result of reimplementing the loop logic.
2021-06-09 06:49:58 +04:30
LibJS: Add for loop bytecode generation
2021-06-08 10:54:40 +01:00
if (m_test) {
LibJS: Generate bytecode in basic blocks instead of one big block This limits the size of each block (currently set to 1K), and gets us closer to a canonical, more easily analysable bytecode format. As a result of this, "Labels" are now simply entries to basic blocks. Since there is no more 'conditional' jump (as all jumps are always taken), JumpIf{True,False} are unified to JumpConditional, and JumpIfNullish is renamed to JumpNullish. Also fixes #7914 as a result of reimplementing the loop logic.
2021-06-09 06:49:58 +04:30
generator.switch_to_basic_block(*test_block_ptr);
LibJS/Bytecode: Return the proper result for iteration statements
2023-06-25 20:52:35 +01:00
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto test = TRY(m_test->generate_bytecode(generator)).value();
LibJS/Bytecode: Do basic compare-and-jump peephole optimization We now fuse sequences like [LessThan, JumpIf] to JumpLessThan. This is only allowed for temporaries (i.e VM registers) with no other references to them.
2024-05-09 15:13:31 +02:00
generator.emit_jump_if(test, Bytecode::Label { *body_block_ptr }, Bytecode::Label { end_block });
LibJS: Add for loop bytecode generation
2021-06-08 10:54:40 +01:00
}
LibJS: Introduce an accumulator register to Bytecode::Interpreter This commit introduces the concept of an accumulator register to LibJS's bytecode interpreter. The accumulator register is always register 0, and most simple instructions use it for reading and writing. Not only does this slim down the AST, but it also simplifies a lot of the code. For example, the generate_bytecode methods no longer need to return an Optional<Register>, as any opcode which has a "return" value will always put it into the accumulator. This also renames the old Op::Load to Op::LoadImmediate, and uses Op::Load to load from a register into the accumulator. There is also an Op::Store to put the value in the accumulator into another register.
2021-06-07 20:58:36 -07:00
LibJS/Bytecode: Fix multiple wrong jumps in ForStatement codegen
2023-06-15 19:13:00 +02:00
if (m_update) {
generator.switch_to_basic_block(*update_block_ptr);
LibJS/Bytecode: Return the proper result for iteration statements
2023-06-25 20:52:35 +01:00
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
(void)TRY(m_update->generate_bytecode(generator));
LibJS: Remove almost all uses of Op::Jump::set_targets() We should initialize jump targets when constructing the jump instruction instead of doing it later. This was already the case in all construction sites but one. This first patch converts all those sites to pass final targets to the constructor directly.
2023-09-28 12:43:11 +02:00
generator.emit<Bytecode::Op::Jump>(Bytecode::Label { *test_block_ptr });
LibJS/Bytecode: Fix multiple wrong jumps in ForStatement codegen
2023-06-15 19:13:00 +02:00
}
LibJS: Generate bytecode in basic blocks instead of one big block This limits the size of each block (currently set to 1K), and gets us closer to a canonical, more easily analysable bytecode format. As a result of this, "Labels" are now simply entries to basic blocks. Since there is no more 'conditional' jump (as all jumps are always taken), JumpIf{True,False} are unified to JumpConditional, and JumpIfNullish is renamed to JumpNullish. Also fixes #7914 as a result of reimplementing the loop logic.
2021-06-09 06:49:58 +04:30
generator.switch_to_basic_block(*body_block_ptr);
LibJS/Bytecode: Fix multiple wrong jumps in ForStatement codegen
2023-06-15 19:13:00 +02:00
generator.begin_continuable_scope(Bytecode::Label { m_update ? *update_block_ptr : *test_block_ptr }, label_set);
LibJS/Bytecode: Don't begin breakable scope before variable scope in for This is no longer required, since the variable scope is ended after switching to the end block, which means that LeaveLexicalEnvironment will always be generated instead of depending on the unwind mechanism to handle it for us.
2022-07-17 19:22:18 +01:00
generator.begin_breakable_scope(Bytecode::Label { end_block }, label_set);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto body_result = TRY(m_body->generate_bytecode(generator));
LibJS/Bytecode: Don't begin breakable scope before variable scope in for This is no longer required, since the variable scope is ended after switching to the end block, which means that LeaveLexicalEnvironment will always be generated instead of depending on the unwind mechanism to handle it for us.
2022-07-17 19:22:18 +01:00
generator.end_breakable_scope();
LibJS: Add for loop bytecode generation
2021-06-08 10:54:40 +01:00
generator.end_continuable_scope();
LibJS: Generate bytecode in basic blocks instead of one big block This limits the size of each block (currently set to 1K), and gets us closer to a canonical, more easily analysable bytecode format. As a result of this, "Labels" are now simply entries to basic blocks. Since there is no more 'conditional' jump (as all jumps are always taken), JumpIf{True,False} are unified to JumpConditional, and JumpIfNullish is renamed to JumpNullish. Also fixes #7914 as a result of reimplementing the loop logic.
2021-06-09 06:49:58 +04:30
LibJS: Don't generate code after we've encountered a terminating op
2021-06-09 19:57:18 +02:00
if (!generator.is_current_block_terminated()) {
LibJS: Fix crash in bytecode generator on https://twinings.co.uk/ If the current block has already been terminated, we should just skip creating a per-iteration environment.
2024-07-24 10:35:39 +02:00
// CreatePerIterationEnvironment where lastIterationEnv is the environment
// created by the previous CreatePerIterationEnvironment setup
generate_per_iteration_bindings();
LibJS: Don't generate code after we've encountered a terminating op
2021-06-09 19:57:18 +02:00
if (m_update) {
LibJS: Remove almost all uses of Op::Jump::set_targets() We should initialize jump targets when constructing the jump instruction instead of doing it later. This was already the case in all construction sites but one. This first patch converts all those sites to pass final targets to the constructor directly.
2023-09-28 12:43:11 +02:00
generator.emit<Bytecode::Op::Jump>(Bytecode::Label { *update_block_ptr });
LibJS/Bytecode: Fix multiple wrong jumps in ForStatement codegen
2023-06-15 19:13:00 +02:00
} else {
LibJS: Remove almost all uses of Op::Jump::set_targets() We should initialize jump targets when constructing the jump instruction instead of doing it later. This was already the case in all construction sites but one. This first patch converts all those sites to pass final targets to the constructor directly.
2023-09-28 12:43:11 +02:00
generator.emit<Bytecode::Op::Jump>(Bytecode::Label { *test_block_ptr });
LibJS: Don't generate code after we've encountered a terminating op
2021-06-09 19:57:18 +02:00
}
LibJS: Generate bytecode in basic blocks instead of one big block This limits the size of each block (currently set to 1K), and gets us closer to a canonical, more easily analysable bytecode format. As a result of this, "Labels" are now simply entries to basic blocks. Since there is no more 'conditional' jump (as all jumps are always taken), JumpIf{True,False} are unified to JumpConditional, and JumpIfNullish is renamed to JumpNullish. Also fixes #7914 as a result of reimplementing the loop logic.
2021-06-09 06:49:58 +04:30
}
LibJS: Make ASTNode::generate_bytecode() fallible Instead of crashing on the spot, return a descriptive error that will eventually continue its days as a javascript "InternalError" exception. This should make random crashes with BC less likely.
2022-02-12 19:54:08 +03:30
LibJS/Bytecode: End the for variable scope at the start of its end block If the for loop's body is not block terminated, we will generate a Jump to the end block which will block terminate the body. Then, we ended the lexical variable scope if needed. However, since the body is now block terminated, the "LeaveLexicalEnvironment" instruction that is generated by end_variable_scope is now dropped on the floor. This fixes this by moving it to the beginning of the end block.
2022-06-30 15:55:57 +01:00
generator.switch_to_basic_block(end_block);
LibJS: Implement CreatePerIterationEnvironment for 'for' statements Implement for CreatePerIterationEnvironment for 'for' loops per the Ecma Standard. This ensures each iteration of a 'for' loop has its own lexical environment so that variables declared in the loop are scoped to the current iteration.
2024-07-16 16:56:02 -04:00
// Leave the environment setup by CreatePerIterationEnvironment or if there
// are no perIterationBindings the variable scope created for bound
// identifiers
LibJS/Bytecode: End for's variable scope after update block generation The update block can generate bytecode that refers to the lexical environment, so we have to end the scope after it has been generated. Previously the Jump to the update block would terminate the block, causing us to leave the lexical environment just before jumping to the update block.
2022-03-15 01:44:32 +00:00
if (has_lexical_environment)
generator.end_variable_scope();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return body_result;
LibJS: Add for loop bytecode generation
2021-06-08 10:54:40 +01:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> ObjectExpression::generate_bytecode(Bytecode::Generator& generator, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS: Add a NewObject bytecode instruction for ObjectExpression :^)
2021-06-04 20:30:23 +02:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS: Add a NewObject bytecode instruction for ObjectExpression :^)
2021-06-04 20:30:23 +02:00
LibJS: Store NewObject result directly in preferred dst if possible This avoids a Mov after every object literal.
2025-03-27 15:49:49 +00:00
auto object = choose_dst(generator, preferred_dst);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::NewObject>(object);
if (m_properties.is_empty())
return object;
LibJS: Add bytecode generation for simple ObjectExpressions Bytecode is now generated for object literals which only contain simple key-value pairs (i.e. no spread, getters or setters)
2021-06-11 19:40:48 +03:00
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.push_home_object(object);
LibJS/Bytecode: Set "home object" of functions within object expression We manage this by having a stack of home objects in Generator, and then adding an optional home object parameter to the NewFunction instruction.
2023-06-16 10:25:05 +02:00
LibJS: Add bytecode generation for simple ObjectExpressions Bytecode is now generated for object literals which only contain simple key-value pairs (i.e. no spread, getters or setters)
2021-06-11 19:40:48 +03:00
for (auto& property : m_properties) {
LibJS: Implement bytecode generation for all ObjectExpression properties
2022-03-31 00:59:58 +04:30
Bytecode::Op::PropertyKind property_kind;
Everywhere: Stop using NonnullRefPtrVector This class had slightly confusing semantics and the added weirdness doesn't seem worth it just so we can say "." instead of "->" when iterating over a vector of NNRPs. This patch replaces NonnullRefPtrVector<T> with Vector<NNRP<T>>.
2023-03-06 14:17:01 +01:00
switch (property->type()) {
LibJS: Implement bytecode generation for all ObjectExpression properties
2022-03-31 00:59:58 +04:30
case ObjectProperty::Type::KeyValue:
LibJS/Bytecode: Always make own properties in object expressions When building an object from an object expression, we don't want to go through the full property setting machinery. This patch adds a new PropertyKind::DirectKeyValue for PutById which guarantees that the property becomes an own property. This fixes an issue where setting the "__proto__" property in object expressions wasn't working right. 12 new passes on test262. :^)
2023-07-10 08:44:28 +02:00
property_kind = Bytecode::Op::PropertyKind::DirectKeyValue;
LibJS: Implement bytecode generation for all ObjectExpression properties
2022-03-31 00:59:58 +04:30
break;
case ObjectProperty::Type::Getter:
property_kind = Bytecode::Op::PropertyKind::Getter;
break;
case ObjectProperty::Type::Setter:
property_kind = Bytecode::Op::PropertyKind::Setter;
break;
case ObjectProperty::Type::ProtoSetter:
property_kind = Bytecode::Op::PropertyKind::ProtoSetter;
break;
LibJS: Add `PutBySpread` instruction This object property kind had completely different behaviour. By adding an instruction for it, we can remove a bunch of special casing, and avoid creating dummy `PropertyKey` values.
2024-11-01 22:00:32 +01:00
case ObjectProperty::Type::Spread:
generator.emit<Bytecode::Op::PutBySpread>(object, TRY(property->key().generate_bytecode(generator)).value());
continue;
LibJS: Implement bytecode generation for all ObjectExpression properties
2022-03-31 00:59:58 +04:30
}
LibJS: Add bytecode generation for simple ObjectExpressions Bytecode is now generated for object literals which only contain simple key-value pairs (i.e. no spread, getters or setters)
2021-06-11 19:40:48 +03:00
Everywhere: Stop using NonnullRefPtrVector This class had slightly confusing semantics and the added weirdness doesn't seem worth it just so we can say "." instead of "->" when iterating over a vector of NNRPs. This patch replaces NonnullRefPtrVector<T> with Vector<NNRP<T>>.
2023-03-06 14:17:01 +01:00
if (is<StringLiteral>(property->key())) {
auto& string_literal = static_cast<StringLiteral const&>(property->key());
LibJS: Use FlyString in PropertyKey instead of DeprecatedFlyString This required dealing with *substantial* fallout.
2025-03-18 18:08:02 -05:00
Bytecode::IdentifierTableIndex key_name = generator.intern_identifier(MUST(FlyString::from_utf8(string_literal.value().bytes())));
LibJS: Add bytecode generation for simple ObjectExpressions Bytecode is now generated for object literals which only contain simple key-value pairs (i.e. no spread, getters or setters)
2021-06-11 19:40:48 +03:00
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Optional<ScopedOperand> value;
LibJS/Bytecode: Transfer object expression property names to functions 2 new passes on test262. :^)
2023-06-25 19:25:38 +02:00
if (property_kind == Bytecode::Op::PropertyKind::ProtoSetter) {
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
value = TRY(property->value().generate_bytecode(generator)).value();
LibJS: Add `PutBySpread` instruction This object property kind had completely different behaviour. By adding an instruction for it, we can remove a bunch of special casing, and avoid creating dummy `PropertyKey` values.
2024-11-01 22:00:32 +01:00
} else {
LibJS: Use FlyString in PropertyKey instead of DeprecatedFlyString This required dealing with *substantial* fallout.
2025-03-18 18:08:02 -05:00
auto identifier = string_literal.value();
LibJS: Assign getter/setter function names as early as possible In case of {get func() {}, set func() {}} we were wrongly setting the function name to 'func' and then later trying to replace an empty name with 'get func'/'set func' which failed. Instead, set the name to 'get func'/'set func' right away. The code in put_by_property_key is kept, for when that is called by put_by_value.
2023-11-05 11:21:32 +01:00
if (property_kind == Bytecode::Op::PropertyKind::Getter)
LibJS: Use FlyString in PropertyKey instead of DeprecatedFlyString This required dealing with *substantial* fallout.
2025-03-18 18:08:02 -05:00
identifier = MUST(String::formatted("get {}", identifier));
LibJS: Assign getter/setter function names as early as possible In case of {get func() {}, set func() {}} we were wrongly setting the function name to 'func' and then later trying to replace an empty name with 'get func'/'set func' which failed. Instead, set the name to 'get func'/'set func' right away. The code in put_by_property_key is kept, for when that is called by put_by_value.
2023-11-05 11:21:32 +01:00
else if (property_kind == Bytecode::Op::PropertyKind::Setter)
LibJS: Use FlyString in PropertyKey instead of DeprecatedFlyString This required dealing with *substantial* fallout.
2025-03-18 18:08:02 -05:00
identifier = MUST(String::formatted("set {}", identifier));
LibJS: Assign getter/setter function names as early as possible In case of {get func() {}, set func() {}} we were wrongly setting the function name to 'func' and then later trying to replace an empty name with 'get func'/'set func' which failed. Instead, set the name to 'get func'/'set func' right away. The code in put_by_property_key is kept, for when that is called by put_by_value.
2023-11-05 11:21:32 +01:00
auto name = generator.intern_identifier(identifier);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
value = TRY(generator.emit_named_evaluation_if_anonymous_function(property->value(), name)).value();
LibJS/Bytecode: Transfer object expression property names to functions 2 new passes on test262. :^)
2023-06-25 19:25:38 +02:00
}
LibJS: Implement bytecode generation for all ObjectExpression properties
2022-03-31 00:59:58 +04:30
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::PutById>(object, key_name, *value, property_kind, generator.next_property_lookup_cache());
LibJS: Add bytecode generation for simple ObjectExpressions Bytecode is now generated for object literals which only contain simple key-value pairs (i.e. no spread, getters or setters)
2021-06-11 19:40:48 +03:00
} else {
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto property_name = TRY(property->key().generate_bytecode(generator)).value();
LibJS: Add `PutBySpread` instruction This object property kind had completely different behaviour. By adding an instruction for it, we can remove a bunch of special casing, and avoid creating dummy `PropertyKey` values.
2024-11-01 22:00:32 +01:00
auto value = TRY(property->value().generate_bytecode(generator)).value();
LibJS: Implement bytecode generation for all ObjectExpression properties
2022-03-31 00:59:58 +04:30
LibJS: Emit PutById instead of PutByValue when key is string literal Basically convert o["foo"]=x into o.foo=x when emitting bytecode. These are effectively the same thing, and the latter format opts into using an inline cache for the property lookups.
2025-04-03 14:29:44 +02:00
generator.emit_put_by_value(object, property_name, value, property_kind, {});
LibJS: Add bytecode generation for simple ObjectExpressions Bytecode is now generated for object literals which only contain simple key-value pairs (i.e. no spread, getters or setters)
2021-06-11 19:40:48 +03:00
}
}
LibJS/Bytecode: Set "home object" of functions within object expression We manage this by having a stack of home objects in Generator, and then adding an optional home object parameter to the NewFunction instruction.
2023-06-16 10:25:05 +02:00
generator.pop_home_object();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return object;
LibJS: Add a NewObject bytecode instruction for ObjectExpression :^)
2021-06-04 20:30:23 +02:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> ArrayExpression::generate_bytecode(Bytecode::Generator& generator, Optional<ScopedOperand> preferred_dst) const
LibJS: Generate bytecode for array expressions
2021-06-08 23:06:52 +02:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS: Add support for SpreadExpressions in array literals for bytecode For this it adds another opcode `Append $lhs` which appends the accumulator to the Array in $lhs, optionally spreading it.
2022-09-09 15:23:02 +02:00
if (m_elements.is_empty()) {
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto dst = choose_dst(generator, preferred_dst);
generator.emit<Bytecode::Op::NewArray>(dst);
return dst;
LibJS: Use ranges instead of specifying all registers for NewArray Listing all the registers will lead to the inability to allocate enough space in one basic block (as there can be an arbitrary number of registers used), instead switch to specifying the range of registers used and save a lot of space in the process.
2022-03-14 14:48:42 +00:00
}
LibJS: Generate bytecode for array expressions
2021-06-08 23:06:52 +02:00
LibJS: Instantiate primitive array expressions using a single operation This will not meaningfully affect short array literals, but it does give us a bit of extra perf when evaluating huge array expressions like in Kraken/imaging-darkroom.js
2023-11-17 22:07:23 +02:00
if (all_of(m_elements, [](auto element) { return !element || is<PrimitiveLiteral>(*element); })) {
// If all elements are constant primitives, we can just emit a single instruction to initialize the array,
// instead of emitting instructions to manually evaluate them one-by-one
LibJS/Bytecode: Make NewPrimitiveArray a variable-length instruction Instead of having a FixedArray with a separate heap allocation, we can just bake the primitive values into the instruction itself.
2024-03-03 12:37:28 +01:00
Vector<Value> values;
LibJS: Make Value() default-construct the undefined value The special empty value (that we use for array holes, Optional<Value> when empty and a few other other placeholder/sentinel tasks) still exists, but you now create one via JS::js_special_empty_value() and check for it with Value::is_special_empty_value(). The main idea here is to make it very unlikely to accidentally create an unexpected special empty value.
2025-04-04 23:16:34 +02:00
values.resize_with_default_value(m_elements.size(), js_special_empty_value());
LibJS: Instantiate primitive array expressions using a single operation This will not meaningfully affect short array literals, but it does give us a bit of extra perf when evaluating huge array expressions like in Kraken/imaging-darkroom.js
2023-11-17 22:07:23 +02:00
for (auto i = 0u; i < m_elements.size(); ++i) {
if (!m_elements[i])
continue;
values[i] = static_cast<PrimitiveLiteral const&>(*m_elements[i]).value();
}
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto dst = choose_dst(generator, preferred_dst);
LibJS/Bytecode: Make NewPrimitiveArray a variable-length instruction Instead of having a FixedArray with a separate heap allocation, we can just bake the primitive values into the instruction itself.
2024-03-03 12:37:28 +01:00
generator.emit_with_extra_value_slots<Bytecode::Op::NewPrimitiveArray>(values.size(), dst, values);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return dst;
LibJS: Instantiate primitive array expressions using a single operation This will not meaningfully affect short array literals, but it does give us a bit of extra perf when evaluating huge array expressions like in Kraken/imaging-darkroom.js
2023-11-17 22:07:23 +02:00
}
LibJS: Add support for SpreadExpressions in array literals for bytecode For this it adds another opcode `Append $lhs` which appends the accumulator to the Array in $lhs, optionally spreading it.
2022-09-09 15:23:02 +02:00
auto first_spread = find_if(m_elements.begin(), m_elements.end(), [](auto el) { return el && is<SpreadExpression>(*el); });
LibJS/Bytecode: Make NewArray a variable-length instruction This removes a layer of indirection in the bytecode where we had to make sure all the initializer elements were laid out in sequential registers. Array expressions no longer clobber registers permanently, and they can be reused immediately afterwards.
2024-05-08 12:43:08 +02:00
Vector<ScopedOperand> args;
args.ensure_capacity(m_elements.size());
LibJS: Add support for SpreadExpressions in array literals for bytecode For this it adds another opcode `Append $lhs` which appends the accumulator to the Array in $lhs, optionally spreading it.
2022-09-09 15:23:02 +02:00
for (auto it = m_elements.begin(); it != first_spread; ++it) {
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
if (*it) {
auto value = TRY((*it)->generate_bytecode(generator)).value();
LibJS/Bytecode: Add and use copy_if_needed_to_preserve_evaluation_order This is a new Bytecode::Generator helper that takes an operand and returns the same operand, or a copy of it, in case a copy is required to preserve correct evaluation order. This can be used in a bunch of places where we're worried about clobbering some value after obtaining it. Practically, locals are always copied, and temporary registers as well as constants are returned as-is.
2024-06-01 10:00:32 +02:00
args.append(generator.copy_if_needed_to_preserve_evaluation_order(value));
LibJS/Bytecode: Make NewArray a variable-length instruction This removes a layer of indirection in the bytecode where we had to make sure all the initializer elements were laid out in sequential registers. Array expressions no longer clobber registers permanently, and they can be reused immediately afterwards.
2024-05-08 12:43:08 +02:00
} else {
LibJS: Make Value() default-construct the undefined value The special empty value (that we use for array holes, Optional<Value> when empty and a few other other placeholder/sentinel tasks) still exists, but you now create one via JS::js_special_empty_value() and check for it with Value::is_special_empty_value(). The main idea here is to make it very unlikely to accidentally create an unexpected special empty value.
2025-04-04 23:16:34 +02:00
args.append(generator.add_constant(js_special_empty_value()));
LibJS: Generate bytecode for array expressions
2021-06-08 23:06:52 +02:00
}
}
LibJS: Add support for SpreadExpressions in array literals for bytecode For this it adds another opcode `Append $lhs` which appends the accumulator to the Array in $lhs, optionally spreading it.
2022-09-09 15:23:02 +02:00
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto dst = choose_dst(generator, preferred_dst);
if (first_spread.index() != 0) {
LibJS/Bytecode: Make NewArray a variable-length instruction This removes a layer of indirection in the bytecode where we had to make sure all the initializer elements were laid out in sequential registers. Array expressions no longer clobber registers permanently, and they can be reused immediately afterwards.
2024-05-08 12:43:08 +02:00
generator.emit_with_extra_operand_slots<Bytecode::Op::NewArray>(args.size(), dst, args);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
} else {
generator.emit<Bytecode::Op::NewArray>(dst);
}
LibJS: Add support for SpreadExpressions in array literals for bytecode For this it adds another opcode `Append $lhs` which appends the accumulator to the Array in $lhs, optionally spreading it.
2022-09-09 15:23:02 +02:00
if (first_spread != m_elements.end()) {
for (auto it = first_spread; it != m_elements.end(); ++it) {
if (!*it) {
LibJS: Make Value() default-construct the undefined value The special empty value (that we use for array holes, Optional<Value> when empty and a few other other placeholder/sentinel tasks) still exists, but you now create one via JS::js_special_empty_value() and check for it with Value::is_special_empty_value(). The main idea here is to make it very unlikely to accidentally create an unexpected special empty value.
2025-04-04 23:16:34 +02:00
generator.emit<Bytecode::Op::ArrayAppend>(dst, generator.add_constant(js_special_empty_value()), false);
LibJS: Add support for SpreadExpressions in array literals for bytecode For this it adds another opcode `Append $lhs` which appends the accumulator to the Array in $lhs, optionally spreading it.
2022-09-09 15:23:02 +02:00
} else {
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto value = TRY((*it)->generate_bytecode(generator)).value();
generator.emit<Bytecode::Op::ArrayAppend>(dst, value, *it && is<SpreadExpression>(**it));
LibJS: Add support for SpreadExpressions in array literals for bytecode For this it adds another opcode `Append $lhs` which appends the accumulator to the Array in $lhs, optionally spreading it.
2022-09-09 15:23:02 +02:00
}
}
LibJS: Use ranges instead of specifying all registers for NewArray Listing all the registers will lead to the inability to allocate enough space in one basic block (as there can be an arbitrary number of registers used), instead switch to specifying the range of registers used and save a lot of space in the process.
2022-03-14 14:48:42 +00:00
}
LibJS: Add support for SpreadExpressions in array literals for bytecode For this it adds another opcode `Append $lhs` which appends the accumulator to the Array in $lhs, optionally spreading it.
2022-09-09 15:23:02 +02:00
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return dst;
LibJS: Generate bytecode for array expressions
2021-06-08 23:06:52 +02:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> MemberExpression::generate_bytecode(Bytecode::Generator& generator, Optional<ScopedOperand> preferred_dst) const
LibJS: Add GetById bytecode instruction for object property retrieval Same as PutById but in the other direction. :^)
2021-06-04 21:03:53 +02:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto reference = TRY(generator.emit_load_from_reference(*this, preferred_dst));
return reference.loaded_value;
LibJS: Add GetById bytecode instruction for object property retrieval Same as PutById but in the other direction. :^)
2021-06-04 21:03:53 +02:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> FunctionDeclaration::generate_bytecode(Bytecode::Generator& generator, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS: Support basic function calls in the bytecode world :^) This patch adds the Call bytecode instruction which is emitted for the CallExpression AST node. It's pretty barebones and doesn't handle 'this' values properly, etc. But it can perform basic function calls! :^) Note that the called function will *not* execute as bytecode, but will simply fall back into the old codepath and use the AST interpreter.
2021-06-05 15:15:30 +02:00
{
LibJS: More properly implement scoping rules in bytecode codegen Now we emit CreateVariable and SetVariable with the appropriate initialization/environment modes, much closer to the spec. This makes a whole lot of things like let/const variables, function and variable hoisting and some other things work :^)
2022-02-12 19:48:45 +03:30
if (m_is_hoisted) {
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS: More properly implement scoping rules in bytecode codegen Now we emit CreateVariable and SetVariable with the appropriate initialization/environment modes, much closer to the spec. This makes a whole lot of things like let/const variables, function and variable hoisting and some other things work :^)
2022-02-12 19:48:45 +03:30
auto index = generator.intern_identifier(name());
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto value = generator.allocate_register();
LibJS/Bytecode: Rename GetVariable => GetBinding
2024-05-14 11:32:04 +02:00
generator.emit<Bytecode::Op::GetBinding>(value, index);
LibJS/Bytecode: Split SetVariable into four separate instructions Instead of SetVariable having 2x2 modes for variable/lexical and initialize/set, those 4 modes are now separate instructions, which makes each instruction much less branchy.
2024-05-14 11:30:30 +02:00
generator.emit<Bytecode::Op::SetVariableBinding>(index, value);
LibJS: More properly implement scoping rules in bytecode codegen Now we emit CreateVariable and SetVariable with the appropriate initialization/environment modes, much closer to the spec. This makes a whole lot of things like let/const variables, function and variable hoisting and some other things work :^)
2022-02-12 19:48:45 +03:30
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
return Optional<ScopedOperand> {};
LibJS: Support basic function calls in the bytecode world :^) This patch adds the Call bytecode instruction which is emitted for the CallExpression AST node. It's pretty barebones and doesn't handle 'this' values properly, etc. But it can perform basic function calls! :^) Note that the called function will *not* execute as bytecode, but will simply fall back into the old codepath and use the AST interpreter.
2021-06-05 15:15:30 +02:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> FunctionExpression::generate_bytecode_with_lhs_name(Bytecode::Generator& generator, Optional<Bytecode::IdentifierTableIndex> lhs_name, Optional<ScopedOperand> preferred_dst) const
LibJS: Add bytecode generation for FunctionExpression :^)
2021-06-11 10:46:46 +02:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS/Bytecode: Define named functions as a variable inside their scope This allows you to recurse into a named function that is stored in a variable. For example, this would previously print "wrong" instead of "right": ```js function g() { console.log("wrong") } f = function g(i) { if (i !== 1) g(1); else console.log("right"); } f() ```
2022-06-11 23:24:55 +01:00
bool has_name = !name().is_empty();
Optional<Bytecode::IdentifierTableIndex> name_identifier;
if (has_name) {
LibJS/Bytecode: Leave BlockDeclarationInstantiation in C++ Instead of implementing this AO in bytecode, we now have an instruction for it that simply invokes the C++ implementation. This allows us to simplify Bytecode::Generator quite a bit by removing all the variable scope tracking.
2023-06-16 16:34:47 +02:00
generator.begin_variable_scope();
LibJS/Bytecode: Define named functions as a variable inside their scope This allows you to recurse into a named function that is stored in a variable. For example, this would previously print "wrong" instead of "right": ```js function g() { console.log("wrong") } f = function g(i) { if (i !== 1) g(1); else console.log("right"); } f() ```
2022-06-11 23:24:55 +01:00
name_identifier = generator.intern_identifier(name());
generator.emit<Bytecode::Op::CreateVariable>(*name_identifier, Bytecode::Op::EnvironmentMode::Lexical, true);
}
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto new_function = choose_dst(generator, preferred_dst);
generator.emit_new_function(new_function, *this, lhs_name);
LibJS/Bytecode: Define named functions as a variable inside their scope This allows you to recurse into a named function that is stored in a variable. For example, this would previously print "wrong" instead of "right": ```js function g() { console.log("wrong") } f = function g(i) { if (i !== 1) g(1); else console.log("right"); } f() ```
2022-06-11 23:24:55 +01:00
if (has_name) {
LibJS/Bytecode: Split SetVariable into four separate instructions Instead of SetVariable having 2x2 modes for variable/lexical and initialize/set, those 4 modes are now separate instructions, which makes each instruction much less branchy.
2024-05-14 11:30:30 +02:00
generator.emit<Bytecode::Op::InitializeLexicalBinding>(*name_identifier, new_function);
LibJS/Bytecode: Define named functions as a variable inside their scope This allows you to recurse into a named function that is stored in a variable. For example, this would previously print "wrong" instead of "right": ```js function g() { console.log("wrong") } f = function g(i) { if (i !== 1) g(1); else console.log("right"); } f() ```
2022-06-11 23:24:55 +01:00
generator.end_variable_scope();
}
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return new_function;
LibJS: Add bytecode generation for FunctionExpression :^)
2021-06-11 10:46:46 +02:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> FunctionExpression::generate_bytecode(Bytecode::Generator& generator, Optional<ScopedOperand> preferred_dst) const
LibJS/Bytecode: Add codegen for "named evaluation if anonymous function" This gives anonymous functions the name from the LHS they are being assigned to. 171 new passes on test262. :^)
2023-06-23 14:27:42 +02:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return generate_bytecode_with_lhs_name(generator, {}, preferred_dst);
LibJS/Bytecode: Add codegen for "named evaluation if anonymous function" This gives anonymous functions the name from the LHS they are being assigned to. 171 new passes on test262. :^)
2023-06-23 14:27:42 +02:00
}
LibJS: Delete create_variable param in BindingPattern::generate_bytecode It's no longer used, because we assume that caller of this function has already taken care of variable creation and initialization.
2025-04-22 00:33:54 +02:00
static Bytecode::CodeGenerationErrorOr<void> generate_object_binding_pattern_bytecode(Bytecode::Generator& generator, BindingPattern const& pattern, Bytecode::Op::BindingInitializationMode initialization_mode, ScopedOperand const& object)
LibJS: Support object destructuring in the bytecode interpreter
2021-06-13 12:24:55 -07:00
{
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::ThrowIfNullish>(object);
LibJS/Bytecode: Throw on destructuring object assignment to nullish LHS 24 new passes on test262. :^)
2023-06-25 08:50:07 +02:00
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Vector<ScopedOperand> excluded_property_names;
LibJS: Support object rest elements in the bytecode interpreter
2021-06-13 15:30:32 -07:00
auto has_rest = false;
if (pattern.entries.size() > 0)
has_rest = pattern.entries[pattern.entries.size() - 1].is_rest;
LibJS: Support object destructuring in the bytecode interpreter
2021-06-13 12:24:55 -07:00
for (auto& [name, alias, initializer, is_rest] : pattern.entries) {
LibJS: Support object rest elements in the bytecode interpreter
2021-06-13 15:30:32 -07:00
if (is_rest) {
VERIFY(!initializer);
LibJS/Bytecode: Support using MemberExpression as rest property Also, don't assert while dumping an AST with this construct. 7 new passes on test262. :^)
2023-07-02 11:24:55 +02:00
if (name.has<NonnullRefPtr<Identifier const>>()) {
LibJS: Update bytecode generator to use local variables - Update ECMAScriptFunctionObject::function_declaration_instantiation to initialize local variables - Introduce GetLocal, SetLocal, TypeofLocal that will be used to operate on local variables. - Update bytecode generator to emit instructions for local variables
2023-07-05 02:17:10 +02:00
auto identifier = name.get<NonnullRefPtr<Identifier const>>();
LibJS: Support object rest elements in the bytecode interpreter
2021-06-13 15:30:32 -07:00
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto copy = generator.allocate_register();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit_with_extra_operand_slots<Bytecode::Op::CopyObjectExcludingProperties>(
excluded_property_names.size(), copy, object, excluded_property_names);
generator.emit_set_variable(*identifier, copy, initialization_mode);
LibJS: Support object rest elements in the bytecode interpreter
2021-06-13 15:30:32 -07:00
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return {};
LibJS/Bytecode: Support using MemberExpression as rest property Also, don't assert while dumping an AST with this construct. 7 new passes on test262. :^)
2023-07-02 11:24:55 +02:00
}
if (alias.has<NonnullRefPtr<MemberExpression const>>()) {
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto copy = generator.allocate_register();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit_with_extra_operand_slots<Bytecode::Op::CopyObjectExcludingProperties>(
excluded_property_names.size(), copy, object, excluded_property_names);
(void)TRY(generator.emit_store_to_reference(alias.get<NonnullRefPtr<MemberExpression const>>(), object));
return {};
LibJS/Bytecode: Support using MemberExpression as rest property Also, don't assert while dumping an AST with this construct. 7 new passes on test262. :^)
2023-07-02 11:24:55 +02:00
}
VERIFY_NOT_REACHED();
LibJS: Support object rest elements in the bytecode interpreter
2021-06-13 15:30:32 -07:00
}
LibJS: Support object destructuring in the bytecode interpreter
2021-06-13 12:24:55 -07:00
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto value = generator.allocate_register();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
LibJS: Make RefPtr and NonnullRefPtr usage const-correct This mainly affected the AST, which is now const throughout.
2023-02-19 22:07:52 +01:00
if (name.has<NonnullRefPtr<Identifier const>>()) {
LibJS/Bytecode: Make primitive strings be constants Instead of emitting a NewString instruction to construct a primitive string from a parsed literal, we now instantiate the PrimitiveString on the heap during codegen.
2024-03-03 11:34:36 +01:00
auto const& identifier = name.get<NonnullRefPtr<Identifier const>>()->string();
LibJS: Support object rest elements in the bytecode interpreter
2021-06-13 15:30:32 -07:00
if (has_rest) {
LibJS/Bytecode: Make constant deduplication a bit smarter Instead of scanning through the list of seen constants, we now have a more structured storage of the constants true, false, null, undefined, and every possible Int32 value. This fixes an O(n^2) issue found by Kraken/json-stringify-tinderbox.js
2024-05-14 14:28:22 +02:00
excluded_property_names.append(generator.add_constant(PrimitiveString::create(generator.vm(), identifier)));
LibJS: Support object rest elements in the bytecode interpreter
2021-06-13 15:30:32 -07:00
}
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit_get_by_id(value, object, generator.intern_identifier(identifier));
LibJS: Implement array destructuring for the bytecode interpreter
2021-06-13 13:40:48 -07:00
} else {
LibJS: Make RefPtr and NonnullRefPtr usage const-correct This mainly affected the AST, which is now const throughout.
2023-02-19 22:07:52 +01:00
auto expression = name.get<NonnullRefPtr<Expression const>>();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto property_name = TRY(expression->generate_bytecode(generator)).value();
LibJS: Support object rest elements in the bytecode interpreter
2021-06-13 15:30:32 -07:00
if (has_rest) {
LibJS/Bytecode: Add and use copy_if_needed_to_preserve_evaluation_order This is a new Bytecode::Generator helper that takes an operand and returns the same operand, or a copy of it, in case a copy is required to preserve correct evaluation order. This can be used in a bunch of places where we're worried about clobbering some value after obtaining it. Practically, locals are always copied, and temporary registers as well as constants are returned as-is.
2024-06-01 10:00:32 +02:00
auto excluded_name = generator.copy_if_needed_to_preserve_evaluation_order(property_name);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
excluded_property_names.append(excluded_name);
LibJS: Support object rest elements in the bytecode interpreter
2021-06-13 15:30:32 -07:00
}
LibJS: Emit GetById instead of GetByValue when key is string literal Basically convert o["foo"] into o.foo when emitting bytecode. These are effectively the same thing, and the latter format opts into using an inline cache for the property lookups.
2025-04-03 14:18:24 +02:00
generator.emit_get_by_value(value, object, property_name);
LibJS: Implement array destructuring for the bytecode interpreter
2021-06-13 13:40:48 -07:00
}
LibJS: Support object destructuring in the bytecode interpreter
2021-06-13 12:24:55 -07:00
LibJS: Implement array destructuring for the bytecode interpreter
2021-06-13 13:40:48 -07:00
if (initializer) {
auto& if_undefined_block = generator.make_block();
auto& if_not_undefined_block = generator.make_block();
LibJS: Support object destructuring in the bytecode interpreter
2021-06-13 12:24:55 -07:00
LibJS: Remove almost all uses of Op::Jump::set_targets() We should initialize jump targets when constructing the jump instruction instead of doing it later. This was already the case in all construction sites but one. This first patch converts all those sites to pass final targets to the constructor directly.
2023-09-28 12:43:11 +02:00
generator.emit<Bytecode::Op::JumpUndefined>(
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
value,
LibJS: Implement array destructuring for the bytecode interpreter
2021-06-13 13:40:48 -07:00
Bytecode::Label { if_undefined_block },
Bytecode::Label { if_not_undefined_block });
LibJS: Support object destructuring in the bytecode interpreter
2021-06-13 12:24:55 -07:00
LibJS: Implement array destructuring for the bytecode interpreter
2021-06-13 13:40:48 -07:00
generator.switch_to_basic_block(if_undefined_block);
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Optional<ScopedOperand> default_value;
LibJS/Bytecode: Prefer alias over name in object pattern bindings 10 new passes on test262. :^)
2023-06-27 14:41:09 +02:00
if (auto const* alias_identifier = alias.get_pointer<NonnullRefPtr<Identifier const>>()) {
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
default_value = TRY(generator.emit_named_evaluation_if_anonymous_function(*initializer, generator.intern_identifier((*alias_identifier)->string()))).value();
LibJS/Bytecode: Prefer alias over name in object pattern bindings 10 new passes on test262. :^)
2023-06-27 14:41:09 +02:00
} else if (auto const* lhs = name.get_pointer<NonnullRefPtr<Identifier const>>()) {
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
default_value = TRY(generator.emit_named_evaluation_if_anonymous_function(*initializer, generator.intern_identifier((*lhs)->string()))).value();
LibJS/Bytecode: Add codegen for "named evaluation if anonymous function" This gives anonymous functions the name from the LHS they are being assigned to. 171 new passes on test262. :^)
2023-06-23 14:27:42 +02:00
} else {
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
default_value = TRY(initializer->generate_bytecode(generator)).value();
LibJS/Bytecode: Add codegen for "named evaluation if anonymous function" This gives anonymous functions the name from the LHS they are being assigned to. 171 new passes on test262. :^)
2023-06-23 14:27:42 +02:00
}
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(value, *default_value);
LibJS: Remove almost all uses of Op::Jump::set_targets() We should initialize jump targets when constructing the jump instruction instead of doing it later. This was already the case in all construction sites but one. This first patch converts all those sites to pass final targets to the constructor directly.
2023-09-28 12:43:11 +02:00
generator.emit<Bytecode::Op::Jump>(Bytecode::Label { if_not_undefined_block });
LibJS: Support object destructuring in the bytecode interpreter
2021-06-13 12:24:55 -07:00
LibJS: Implement array destructuring for the bytecode interpreter
2021-06-13 13:40:48 -07:00
generator.switch_to_basic_block(if_not_undefined_block);
}
LibJS: Support object destructuring in the bytecode interpreter
2021-06-13 12:24:55 -07:00
LibJS: Make RefPtr and NonnullRefPtr usage const-correct This mainly affected the AST, which is now const throughout.
2023-02-19 22:07:52 +01:00
if (alias.has<NonnullRefPtr<BindingPattern const>>()) {
auto& binding_pattern = *alias.get<NonnullRefPtr<BindingPattern const>>();
LibJS/Bytecode: Add and use copy_if_needed_to_preserve_evaluation_order This is a new Bytecode::Generator helper that takes an operand and returns the same operand, or a copy of it, in case a copy is required to preserve correct evaluation order. This can be used in a bunch of places where we're worried about clobbering some value after obtaining it. Practically, locals are always copied, and temporary registers as well as constants are returned as-is.
2024-06-01 10:00:32 +02:00
auto nested_value = generator.copy_if_needed_to_preserve_evaluation_order(value);
LibJS: Delete create_variable param in BindingPattern::generate_bytecode It's no longer used, because we assume that caller of this function has already taken care of variable creation and initialization.
2025-04-22 00:33:54 +02:00
TRY(binding_pattern.generate_bytecode(generator, initialization_mode, nested_value));
LibJS: Implement array destructuring for the bytecode interpreter
2021-06-13 13:40:48 -07:00
} else if (alias.has<Empty>()) {
LibJS: Make RefPtr and NonnullRefPtr usage const-correct This mainly affected the AST, which is now const throughout.
2023-02-19 22:07:52 +01:00
if (name.has<NonnullRefPtr<Expression const>>()) {
LibJS: Implement array destructuring for the bytecode interpreter
2021-06-13 13:40:48 -07:00
// This needs some sort of SetVariableByValue opcode, as it's a runtime binding
LibJS: Make ASTNode::generate_bytecode() fallible Instead of crashing on the spot, return a descriptive error that will eventually continue its days as a javascript "InternalError" exception. This should make random crashes with BC less likely.
2022-02-12 19:54:08 +03:30
return Bytecode::CodeGenerationError {
LibJS: Make RefPtr and NonnullRefPtr usage const-correct This mainly affected the AST, which is now const throughout.
2023-02-19 22:07:52 +01:00
name.get<NonnullRefPtr<Expression const>>().ptr(),
LibJS: Make ASTNode::generate_bytecode() fallible Instead of crashing on the spot, return a descriptive error that will eventually continue its days as a javascript "InternalError" exception. This should make random crashes with BC less likely.
2022-02-12 19:54:08 +03:30
"Unimplemented name/alias pair: Empty/Expression"sv,
};
LibJS: Support object destructuring in the bytecode interpreter
2021-06-13 12:24:55 -07:00
}
LibJS: Implement array destructuring for the bytecode interpreter
2021-06-13 13:40:48 -07:00
LibJS: Update bytecode generator to use local variables - Update ECMAScriptFunctionObject::function_declaration_instantiation to initialize local variables - Introduce GetLocal, SetLocal, TypeofLocal that will be used to operate on local variables. - Update bytecode generator to emit instructions for local variables
2023-07-05 02:17:10 +02:00
auto const& identifier = *name.get<NonnullRefPtr<Identifier const>>();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit_set_variable(identifier, value, initialization_mode);
LibJS/Bytecode: Handle object destructuring to member expression 19 new passes on test262. :^)
2023-06-25 16:24:05 +02:00
} else if (alias.has<NonnullRefPtr<MemberExpression const>>()) {
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
TRY(generator.emit_store_to_reference(alias.get<NonnullRefPtr<MemberExpression const>>(), value));
LibJS: Support object destructuring in the bytecode interpreter
2021-06-13 12:24:55 -07:00
} else {
LibJS: Update bytecode generator to use local variables - Update ECMAScriptFunctionObject::function_declaration_instantiation to initialize local variables - Introduce GetLocal, SetLocal, TypeofLocal that will be used to operate on local variables. - Update bytecode generator to emit instructions for local variables
2023-07-05 02:17:10 +02:00
auto const& identifier = *alias.get<NonnullRefPtr<Identifier const>>();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit_set_variable(identifier, value, initialization_mode);
LibJS: Implement array destructuring for the bytecode interpreter
2021-06-13 13:40:48 -07:00
}
}
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return {};
LibJS: Implement array destructuring for the bytecode interpreter
2021-06-13 13:40:48 -07:00
}
LibJS: Delete create_variable param in BindingPattern::generate_bytecode It's no longer used, because we assume that caller of this function has already taken care of variable creation and initialization.
2025-04-22 00:33:54 +02:00
static Bytecode::CodeGenerationErrorOr<void> generate_array_binding_pattern_bytecode(Bytecode::Generator& generator, BindingPattern const& pattern, Bytecode::Op::BindingInitializationMode initialization_mode, ScopedOperand const& input_array, [[maybe_unused]] Optional<ScopedOperand> preferred_dst = {})
LibJS: Implement array destructuring for the bytecode interpreter
2021-06-13 13:40:48 -07:00
{
/*
* Consider the following destructuring assignment:
*
* let [a, b, c, d, e] = o;
*
* It would be fairly trivial to just loop through this iterator, getting the value
* at each step and assigning them to the binding sequentially. However, this is not
* correct: once an iterator is exhausted, it must not be called again. This complicates
* the bytecode. In order to accomplish this, we do the following:
*
* - Reserve a special boolean register which holds 'true' if the iterator is exhausted,
* and false otherwise
* - When we are retrieving the value which should be bound, we first check this register.
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
* If it is 'true', we load undefined. Otherwise, we grab the next value from the iterator.
LibJS: Implement array destructuring for the bytecode interpreter
2021-06-13 13:40:48 -07:00
*
* Note that the is_exhausted register does not need to be loaded with false because the
* first IteratorNext bytecode is _not_ proceeded by an exhausted check, as it is
* unnecessary.
*/
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto is_iterator_exhausted = generator.allocate_register();
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(is_iterator_exhausted, generator.add_constant(Value(false)));
LibJS: Implement array destructuring for the bytecode interpreter
2021-06-13 13:40:48 -07:00
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto iterator = generator.allocate_register();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::GetIterator>(iterator, input_array);
LibJS: Implement array destructuring for the bytecode interpreter
2021-06-13 13:40:48 -07:00
bool first = true;
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto assign_value_to_alias = [&](auto& alias, ScopedOperand value) {
LibJS: Make ASTNode::generate_bytecode() fallible Instead of crashing on the spot, return a descriptive error that will eventually continue its days as a javascript "InternalError" exception. This should make random crashes with BC less likely.
2022-02-12 19:54:08 +03:30
return alias.visit(
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
[&](Empty) -> Bytecode::CodeGenerationErrorOr<void> {
LibJS: Support array rest elements in the bytecode interpreter
2021-06-13 14:06:26 -07:00
// This element is an elision
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return {};
LibJS: Support array rest elements in the bytecode interpreter
2021-06-13 14:06:26 -07:00
},
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
[&](NonnullRefPtr<Identifier const> const& identifier) -> Bytecode::CodeGenerationErrorOr<void> {
generator.emit_set_variable(*identifier, value, initialization_mode);
return {};
LibJS: Support array rest elements in the bytecode interpreter
2021-06-13 14:06:26 -07:00
},
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
[&](NonnullRefPtr<BindingPattern const> const& pattern) -> Bytecode::CodeGenerationErrorOr<void> {
LibJS: Delete create_variable param in BindingPattern::generate_bytecode It's no longer used, because we assume that caller of this function has already taken care of variable creation and initialization.
2025-04-22 00:33:54 +02:00
return pattern->generate_bytecode(generator, initialization_mode, value);
LibJS: Allow member expressions in binding patterns Also allows literal string and numbers as property names in object binding patterns.
2021-09-18 01:11:32 +02:00
},
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
[&](NonnullRefPtr<MemberExpression const> const& expr) -> Bytecode::CodeGenerationErrorOr<void> {
(void)generator.emit_store_to_reference(*expr, value);
return {};
LibJS: Support array rest elements in the bytecode interpreter
2021-06-13 14:06:26 -07:00
});
};
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto temp_iterator_result = generator.allocate_register();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
LibJS: Implement array destructuring for the bytecode interpreter
2021-06-13 13:40:48 -07:00
for (auto& [name, alias, initializer, is_rest] : pattern.entries) {
VERIFY(name.has<Empty>());
LibJS: Support array rest elements in the bytecode interpreter
2021-06-13 14:06:26 -07:00
if (is_rest) {
LibJS/Bytecode: Implement initializers for array binding patterns
2022-07-17 19:25:23 +01:00
VERIFY(!initializer);
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto value = generator.allocate_register();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
LibJS: Support array rest elements in the bytecode interpreter
2021-06-13 14:06:26 -07:00
if (first) {
// The iterator has not been called, and is thus known to be not exhausted
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::IteratorToArray>(value, iterator);
LibJS: Support array rest elements in the bytecode interpreter
2021-06-13 14:06:26 -07:00
} else {
auto& if_exhausted_block = generator.make_block();
auto& if_not_exhausted_block = generator.make_block();
auto& continuation_block = generator.make_block();
LibJS/Bytecode: Do basic compare-and-jump peephole optimization We now fuse sequences like [LessThan, JumpIf] to JumpLessThan. This is only allowed for temporaries (i.e VM registers) with no other references to them.
2024-05-09 15:13:31 +02:00
generator.emit_jump_if(
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
is_iterator_exhausted,
LibJS: Support array rest elements in the bytecode interpreter
2021-06-13 14:06:26 -07:00
Bytecode::Label { if_exhausted_block },
Bytecode::Label { if_not_exhausted_block });
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
value = generator.allocate_register();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
LibJS: Support array rest elements in the bytecode interpreter
2021-06-13 14:06:26 -07:00
generator.switch_to_basic_block(if_exhausted_block);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::NewArray>(value);
LibJS: Remove almost all uses of Op::Jump::set_targets() We should initialize jump targets when constructing the jump instruction instead of doing it later. This was already the case in all construction sites but one. This first patch converts all those sites to pass final targets to the constructor directly.
2023-09-28 12:43:11 +02:00
generator.emit<Bytecode::Op::Jump>(Bytecode::Label { continuation_block });
LibJS: Support array rest elements in the bytecode interpreter
2021-06-13 14:06:26 -07:00
generator.switch_to_basic_block(if_not_exhausted_block);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::IteratorToArray>(value, iterator);
LibJS: Remove almost all uses of Op::Jump::set_targets() We should initialize jump targets when constructing the jump instruction instead of doing it later. This was already the case in all construction sites but one. This first patch converts all those sites to pass final targets to the constructor directly.
2023-09-28 12:43:11 +02:00
generator.emit<Bytecode::Op::Jump>(Bytecode::Label { continuation_block });
LibJS: Support array rest elements in the bytecode interpreter
2021-06-13 14:06:26 -07:00
generator.switch_to_basic_block(continuation_block);
}
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return assign_value_to_alias(alias, value);
LibJS: Support array rest elements in the bytecode interpreter
2021-06-13 14:06:26 -07:00
}
LibJS: Implement array destructuring for the bytecode interpreter
2021-06-13 13:40:48 -07:00
auto& iterator_is_exhausted_block = generator.make_block();
if (!first) {
auto& iterator_is_not_exhausted_block = generator.make_block();
LibJS/Bytecode: Do basic compare-and-jump peephole optimization We now fuse sequences like [LessThan, JumpIf] to JumpLessThan. This is only allowed for temporaries (i.e VM registers) with no other references to them.
2024-05-09 15:13:31 +02:00
generator.emit_jump_if(
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
is_iterator_exhausted,
LibJS: Implement array destructuring for the bytecode interpreter
2021-06-13 13:40:48 -07:00
Bytecode::Label { iterator_is_exhausted_block },
Bytecode::Label { iterator_is_not_exhausted_block });
generator.switch_to_basic_block(iterator_is_not_exhausted_block);
LibJS: Support object destructuring in the bytecode interpreter
2021-06-13 12:24:55 -07:00
}
LibJS: Implement array destructuring for the bytecode interpreter
2021-06-13 13:40:48 -07:00
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::IteratorNext>(temp_iterator_result, iterator);
generator.emit_iterator_complete(is_iterator_exhausted, temp_iterator_result);
LibJS: Implement array destructuring for the bytecode interpreter
2021-06-13 13:40:48 -07:00
// We still have to check for exhaustion here. If the iterator is exhausted,
// we need to bail before trying to get the value
auto& no_bail_block = generator.make_block();
LibJS/Bytecode: Do basic compare-and-jump peephole optimization We now fuse sequences like [LessThan, JumpIf] to JumpLessThan. This is only allowed for temporaries (i.e VM registers) with no other references to them.
2024-05-09 15:13:31 +02:00
generator.emit_jump_if(
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
is_iterator_exhausted,
LibJS: Implement array destructuring for the bytecode interpreter
2021-06-13 13:40:48 -07:00
Bytecode::Label { iterator_is_exhausted_block },
Bytecode::Label { no_bail_block });
generator.switch_to_basic_block(no_bail_block);
// Get the next value in the iterator
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto value = generator.allocate_register();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit_iterator_value(value, temp_iterator_result);
LibJS: Implement array destructuring for the bytecode interpreter
2021-06-13 13:40:48 -07:00
auto& create_binding_block = generator.make_block();
LibJS: Remove almost all uses of Op::Jump::set_targets() We should initialize jump targets when constructing the jump instruction instead of doing it later. This was already the case in all construction sites but one. This first patch converts all those sites to pass final targets to the constructor directly.
2023-09-28 12:43:11 +02:00
generator.emit<Bytecode::Op::Jump>(Bytecode::Label { create_binding_block });
LibJS: Implement array destructuring for the bytecode interpreter
2021-06-13 13:40:48 -07:00
// The iterator is exhausted, so we just load undefined and continue binding
generator.switch_to_basic_block(iterator_is_exhausted_block);
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(value, generator.add_constant(js_undefined()));
LibJS: Remove almost all uses of Op::Jump::set_targets() We should initialize jump targets when constructing the jump instruction instead of doing it later. This was already the case in all construction sites but one. This first patch converts all those sites to pass final targets to the constructor directly.
2023-09-28 12:43:11 +02:00
generator.emit<Bytecode::Op::Jump>(Bytecode::Label { create_binding_block });
LibJS: Implement array destructuring for the bytecode interpreter
2021-06-13 13:40:48 -07:00
generator.switch_to_basic_block(create_binding_block);
LibJS/Bytecode: Implement initializers for array binding patterns
2022-07-17 19:25:23 +01:00
if (initializer) {
auto& value_is_undefined_block = generator.make_block();
auto& value_is_not_undefined_block = generator.make_block();
LibJS: Remove almost all uses of Op::Jump::set_targets() We should initialize jump targets when constructing the jump instruction instead of doing it later. This was already the case in all construction sites but one. This first patch converts all those sites to pass final targets to the constructor directly.
2023-09-28 12:43:11 +02:00
generator.emit<Bytecode::Op::JumpUndefined>(
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
value,
LibJS/Bytecode: Implement initializers for array binding patterns
2022-07-17 19:25:23 +01:00
Bytecode::Label { value_is_undefined_block },
Bytecode::Label { value_is_not_undefined_block });
generator.switch_to_basic_block(value_is_undefined_block);
LibJS/Bytecode: Add codegen for "named evaluation if anonymous function" This gives anonymous functions the name from the LHS they are being assigned to. 171 new passes on test262. :^)
2023-06-23 14:27:42 +02:00
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Optional<ScopedOperand> default_value;
LibJS/Bytecode: Transfer binding pattern aliases to function names 60 new passes on test262. :^)
2023-06-25 11:11:36 +02:00
if (auto const* alias_identifier = alias.get_pointer<NonnullRefPtr<Identifier const>>()) {
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
default_value = TRY(generator.emit_named_evaluation_if_anonymous_function(*initializer, generator.intern_identifier((*alias_identifier)->string()))).value();
LibJS/Bytecode: Transfer binding pattern aliases to function names 60 new passes on test262. :^)
2023-06-25 11:11:36 +02:00
} else if (auto const* name_identifier = name.get_pointer<NonnullRefPtr<Identifier const>>()) {
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
default_value = TRY(generator.emit_named_evaluation_if_anonymous_function(*initializer, generator.intern_identifier((*name_identifier)->string()))).value();
LibJS/Bytecode: Add codegen for "named evaluation if anonymous function" This gives anonymous functions the name from the LHS they are being assigned to. 171 new passes on test262. :^)
2023-06-23 14:27:42 +02:00
} else {
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
default_value = TRY(initializer->generate_bytecode(generator)).value();
LibJS/Bytecode: Add codegen for "named evaluation if anonymous function" This gives anonymous functions the name from the LHS they are being assigned to. 171 new passes on test262. :^)
2023-06-23 14:27:42 +02:00
}
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(value, *default_value);
LibJS/Bytecode: Implement initializers for array binding patterns
2022-07-17 19:25:23 +01:00
generator.emit<Bytecode::Op::Jump>(Bytecode::Label { value_is_not_undefined_block });
generator.switch_to_basic_block(value_is_not_undefined_block);
}
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
TRY(assign_value_to_alias(alias, value));
LibJS: Implement array destructuring for the bytecode interpreter
2021-06-13 13:40:48 -07:00
first = false;
}
LibJS: Make ASTNode::generate_bytecode() fallible Instead of crashing on the spot, return a descriptive error that will eventually continue its days as a javascript "InternalError" exception. This should make random crashes with BC less likely.
2022-02-12 19:54:08 +03:30
LibJS/Bytecode: Ensure iterator is closed after array destructuring If destructuring didn't exhaust the iterator, we have to manually close the iterator. 49 new passes on test262. :^)
2023-06-26 17:21:12 +02:00
auto& done_block = generator.make_block();
auto& not_done_block = generator.make_block();
LibJS/Bytecode: Do basic compare-and-jump peephole optimization We now fuse sequences like [LessThan, JumpIf] to JumpLessThan. This is only allowed for temporaries (i.e VM registers) with no other references to them.
2024-05-09 15:13:31 +02:00
generator.emit_jump_if(
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
is_iterator_exhausted,
LibJS/Bytecode: Ensure iterator is closed after array destructuring If destructuring didn't exhaust the iterator, we have to manually close the iterator. 49 new passes on test262. :^)
2023-06-26 17:21:12 +02:00
Bytecode::Label { done_block },
Bytecode::Label { not_done_block });
generator.switch_to_basic_block(not_done_block);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::IteratorClose>(iterator, Completion::Type::Normal, Optional<Value> {});
LibJS/Bytecode: Ensure iterator is closed after array destructuring If destructuring didn't exhaust the iterator, we have to manually close the iterator. 49 new passes on test262. :^)
2023-06-26 17:21:12 +02:00
generator.emit<Bytecode::Op::Jump>(Bytecode::Label { done_block });
generator.switch_to_basic_block(done_block);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return {};
LibJS: Implement array destructuring for the bytecode interpreter
2021-06-13 13:40:48 -07:00
}
LibJS: Delete create_variable param in BindingPattern::generate_bytecode It's no longer used, because we assume that caller of this function has already taken care of variable creation and initialization.
2025-04-22 00:33:54 +02:00
Bytecode::CodeGenerationErrorOr<void> BindingPattern::generate_bytecode(Bytecode::Generator& generator, Bytecode::Op::BindingInitializationMode initialization_mode, ScopedOperand const& input_value) const
LibJS: Implement array destructuring for the bytecode interpreter
2021-06-13 13:40:48 -07:00
{
LibJS: Move BindingPattern bytecode generation into a method Preparation for upcoming function where binding pattern will have to be used outside of ASTCodegen.cpp
2024-05-09 05:00:07 +00:00
if (kind == Kind::Object)
LibJS: Delete create_variable param in BindingPattern::generate_bytecode It's no longer used, because we assume that caller of this function has already taken care of variable creation and initialization.
2025-04-22 00:33:54 +02:00
return generate_object_binding_pattern_bytecode(generator, *this, initialization_mode, input_value);
LibJS: Make ASTNode::generate_bytecode() fallible Instead of crashing on the spot, return a descriptive error that will eventually continue its days as a javascript "InternalError" exception. This should make random crashes with BC less likely.
2022-02-12 19:54:08 +03:30
LibJS: Delete create_variable param in BindingPattern::generate_bytecode It's no longer used, because we assume that caller of this function has already taken care of variable creation and initialization.
2025-04-22 00:33:54 +02:00
return generate_array_binding_pattern_bytecode(generator, *this, initialization_mode, input_value);
LibJS: Make ASTNode::generate_bytecode() fallible Instead of crashing on the spot, return a descriptive error that will eventually continue its days as a javascript "InternalError" exception. This should make random crashes with BC less likely.
2022-02-12 19:54:08 +03:30
}
LibJS: Support object destructuring in the bytecode interpreter
2021-06-13 12:24:55 -07:00
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
static Bytecode::CodeGenerationErrorOr<void> assign_value_to_variable_declarator(Bytecode::Generator& generator, VariableDeclarator const& declarator, VariableDeclaration const& declaration, ScopedOperand value)
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
{
LibJS/Bytecode: Split SetVariable into four separate instructions Instead of SetVariable having 2x2 modes for variable/lexical and initialize/set, those 4 modes are now separate instructions, which makes each instruction much less branchy.
2024-05-14 11:30:30 +02:00
auto initialization_mode = declaration.is_lexical_declaration() ? Bytecode::Op::BindingInitializationMode::Initialize : Bytecode::Op::BindingInitializationMode::Set;
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
return declarator.target().visit(
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
[&](NonnullRefPtr<Identifier const> const& id) -> Bytecode::CodeGenerationErrorOr<void> {
generator.emit_set_variable(*id, value, initialization_mode);
return {};
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
},
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
[&](NonnullRefPtr<BindingPattern const> const& pattern) -> Bytecode::CodeGenerationErrorOr<void> {
LibJS: Delete create_variable param in BindingPattern::generate_bytecode It's no longer used, because we assume that caller of this function has already taken care of variable creation and initialization.
2025-04-22 00:33:54 +02:00
return pattern->generate_bytecode(generator, initialization_mode, value);
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
});
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> VariableDeclaration::generate_bytecode(Bytecode::Generator& generator, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS: Add empty bytecode generation for VariableDeclaration These will be partly handled by the relevant ScopeNode due to hoisting, same basic idea as function declarations. VariableDeclaration needs to do some work, but let's stub it out first and start empty.
2021-06-10 00:29:17 +02:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS/Bytecode: Do not clobber completion value with VariableDeclaration While the completion value of a variable declaration is specified to be empty, we might already have a completion value in the accumulator from a previous statement. Preserve it so as to avoid clobbering it. This fixes 6 tests on test262.
2023-07-02 10:48:17 +02:00
LibJS: Generate bytecode for entering nested lexical environments This adds a new PushLexicalEnvironment instruction that creates a new LexicalEnvironment and pushes it on the VM's scope stack. There is no corresponding PopLexicalEnvironment instruction yet, so this will behave incorrectly with let/const scopes for example.
2021-06-10 22:12:21 +02:00
for (auto& declarator : m_declarations) {
LibJS/Bytecode: Handle awkward initialization case for duplicate `var` `var` declarations can have duplicates, but duplicate `let` or `const` bindings are a syntax error. Because of this, we can sink `let` and `const` directly into the preferred_dst if available. This is not safe for `var` since the preferred_dst may be used in the initializer. This patch fixes the issue by simply skipping the preferred_dst optimization for `var` declarations.
2024-03-01 12:54:50 +01:00
// NOTE: `var` declarations can have duplicates, but duplicate `let` or `const` bindings are a syntax error.
// Because of this, we can sink `let` and `const` directly into the preferred_dst if available.
// This is not safe for `var` since the preferred_dst may be used in the initializer.
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Optional<ScopedOperand> init_dst;
LibJS/Bytecode: Handle awkward initialization case for duplicate `var` `var` declarations can have duplicates, but duplicate `let` or `const` bindings are a syntax error. Because of this, we can sink `let` and `const` directly into the preferred_dst if available. This is not safe for `var` since the preferred_dst may be used in the initializer. This patch fixes the issue by simply skipping the preferred_dst optimization for `var` declarations.
2024-03-01 12:54:50 +01:00
if (declaration_kind() != DeclarationKind::Var) {
if (auto const* identifier = declarator->target().get_pointer<NonnullRefPtr<Identifier const>>()) {
if ((*identifier)->is_local()) {
LibJS: Skip allocating locals for arguments that allowed to be local This allows us to get rid of instructions that move arguments to locals and allocate smaller JS::Value vector in ExecutionContext by reusing slots that were already allocated for arguments. With this change for following function: ```js function f(x, y) { return x + y; } ``` we now produce following bytecode: ``` [ 0] 0: Add dst:reg6, lhs:arg0, rhs:arg1 [ 10] Return value:reg6 ``` instead of: ``` [ 0] 0: GetArgument 0, dst:x~1 [ 10] GetArgument 1, dst:y~0 [ 20] Add dst:reg6, lhs:x~1, rhs:y~0 [ 30] Return value:reg6 ```
2025-04-25 17:10:47 +02:00
init_dst = generator.local((*identifier)->local_index());
LibJS/Bytecode: Handle awkward initialization case for duplicate `var` `var` declarations can have duplicates, but duplicate `let` or `const` bindings are a syntax error. Because of this, we can sink `let` and `const` directly into the preferred_dst if available. This is not safe for `var` since the preferred_dst may be used in the initializer. This patch fixes the issue by simply skipping the preferred_dst optimization for `var` declarations.
2024-03-01 12:54:50 +01:00
}
LibJS/Bytecode: Add codegen for "named evaluation if anonymous function" This gives anonymous functions the name from the LHS they are being assigned to. 171 new passes on test262. :^)
2023-06-23 14:27:42 +02:00
}
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
}
if (declarator->init()) {
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto value = TRY([&]() -> Bytecode::CodeGenerationErrorOr<ScopedOperand> {
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
if (auto const* lhs = declarator->target().get_pointer<NonnullRefPtr<Identifier const>>()) {
return TRY(generator.emit_named_evaluation_if_anonymous_function(*declarator->init(), generator.intern_identifier((*lhs)->string()), init_dst)).value();
} else {
return TRY(declarator->init()->generate_bytecode(generator, init_dst)).value();
}
}());
(void)TRY(assign_value_to_variable_declarator(generator, declarator, *this, value));
LibJS/Bytecode: Let `var` without initializer codegen to nothing Otherwise we incorrectly overwrite the binding with `undefined` at the point where the `var` statement is. Fixes 9 test262 tests. :^)
2023-06-17 15:16:30 +02:00
} else if (m_declaration_kind != DeclarationKind::Var) {
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
(void)TRY(assign_value_to_variable_declarator(generator, declarator, *this, generator.add_constant(js_undefined())));
LibJS/Bytecode: Let `var` without initializer codegen to nothing Otherwise we incorrectly overwrite the binding with `undefined` at the point where the `var` statement is. Fixes 9 test262 tests. :^)
2023-06-17 15:16:30 +02:00
}
LibJS: Make ASTNode::generate_bytecode() fallible Instead of crashing on the spot, return a descriptive error that will eventually continue its days as a javascript "InternalError" exception. This should make random crashes with BC less likely.
2022-02-12 19:54:08 +03:30
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
if (auto const* identifier = declarator->target().get_pointer<NonnullRefPtr<Identifier const>>()) {
if ((*identifier)->is_local()) {
LibJS: Skip allocating locals for arguments that allowed to be local This allows us to get rid of instructions that move arguments to locals and allocate smaller JS::Value vector in ExecutionContext by reusing slots that were already allocated for arguments. With this change for following function: ```js function f(x, y) { return x + y; } ``` we now produce following bytecode: ``` [ 0] 0: Add dst:reg6, lhs:arg0, rhs:arg1 [ 10] Return value:reg6 ``` instead of: ``` [ 0] 0: GetArgument 0, dst:x~1 [ 10] GetArgument 1, dst:y~0 [ 20] Add dst:reg6, lhs:x~1, rhs:y~0 [ 30] Return value:reg6 ```
2025-04-25 17:10:47 +02:00
generator.set_local_initialized((*identifier)->local_index());
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
}
}
}
// NOTE: VariableDeclaration doesn't return a completion value.
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
return Optional<ScopedOperand> {};
LibJS: Add empty bytecode generation for VariableDeclaration These will be partly handled by the relevant ScopeNode due to hoisting, same basic idea as function declarations. VariableDeclaration needs to do some work, but let's stub it out first and start empty.
2021-06-10 00:29:17 +02:00
}
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
struct BaseAndValue {
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
ScopedOperand base;
ScopedOperand value;
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
};
static Bytecode::CodeGenerationErrorOr<BaseAndValue> get_base_and_value_from_member_expression(Bytecode::Generator& generator, MemberExpression const& member_expression)
LibJS/Bytecode: Implement optional chaining
2023-06-17 14:50:23 +01:00
{
// https://tc39.es/ecma262/#sec-super-keyword-runtime-semantics-evaluation
if (is<SuperExpression>(member_expression.object())) {
// 1. Let env be GetThisEnvironment().
// 2. Let actualThis be ? env.GetThisBinding().
LibJS/Bytecode: Only emit ResolveThisBinding once per basic block Once executed, this instruction will always produce the same result in subsequent executions, so it's okay to cache it. Unfortunately it may throw, so we can't just hoist it to the top of every executable, since that would break observable execution order.
2024-05-07 12:16:37 +02:00
auto this_value = generator.get_this();
LibJS/Bytecode: Implement optional chaining
2023-06-17 14:50:23 +01:00
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Optional<ScopedOperand> computed_property;
LibJS/Bytecode: Implement optional chaining
2023-06-17 14:50:23 +01:00
if (member_expression.is_computed()) {
// SuperProperty : super [ Expression ]
// 3. Let propertyNameReference be ? Evaluation of Expression.
// 4. Let propertyNameValue be ? GetValue(propertyNameReference).
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
computed_property = TRY(member_expression.property().generate_bytecode(generator));
LibJS/Bytecode: Implement optional chaining
2023-06-17 14:50:23 +01:00
}
// 5/7. Return ? MakeSuperPropertyReference(actualThis, propertyKey, strict).
// https://tc39.es/ecma262/#sec-makesuperpropertyreference
// 1. Let env be GetThisEnvironment().
// 2. Assert: env.HasSuperBinding() is true.
// 3. Let baseValue be ? env.GetSuperBase().
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto super_base = generator.allocate_register();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::ResolveSuperBase>(super_base);
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto value = generator.allocate_register();
LibJS/Bytecode: Implement optional chaining
2023-06-17 14:50:23 +01:00
// 4. Return the Reference Record { [[Base]]: baseValue, [[ReferencedName]]: propertyKey, [[Strict]]: strict, [[ThisValue]]: actualThis }.
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
if (computed_property.has_value()) {
LibJS/Bytecode: Implement optional chaining
2023-06-17 14:50:23 +01:00
// 5. Let propertyKey be ? ToPropertyKey(propertyNameValue).
// FIXME: This does ToPropertyKey out of order, which is observable by Symbol.toPrimitive!
LibJS: Emit GetById instead of GetByValue when key is string literal Basically convert o["foo"] into o.foo when emitting bytecode. These are effectively the same thing, and the latter format opts into using an inline cache for the property lookups.
2025-04-03 14:18:24 +02:00
generator.emit_get_by_value_with_this(value, super_base, *computed_property, this_value);
LibJS/Bytecode: Implement optional chaining
2023-06-17 14:50:23 +01:00
} else {
// 3. Let propertyKey be StringValue of IdentifierName.
AK+Everywhere: Rename `verify_cast` to `as` Follow-up to fc20e61e7249006247b43f84a3189d5a37fa103e.
2025-01-21 09:12:05 -05:00
auto identifier_table_ref = generator.intern_identifier(as<Identifier>(member_expression.property()).string());
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit_get_by_id_with_this(value, super_base, identifier_table_ref, this_value);
LibJS/Bytecode: Implement optional chaining
2023-06-17 14:50:23 +01:00
}
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return BaseAndValue { this_value, value };
}
auto base = TRY(member_expression.object().generate_bytecode(generator)).value();
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto value = generator.allocate_register();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
if (member_expression.is_computed()) {
auto property = TRY(member_expression.property().generate_bytecode(generator)).value();
LibJS: Emit GetById instead of GetByValue when key is string literal Basically convert o["foo"] into o.foo when emitting bytecode. These are effectively the same thing, and the latter format opts into using an inline cache for the property lookups.
2025-04-03 14:18:24 +02:00
generator.emit_get_by_value(value, base, property);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
} else if (is<PrivateIdentifier>(member_expression.property())) {
generator.emit<Bytecode::Op::GetPrivateById>(
value,
base,
AK+Everywhere: Rename `verify_cast` to `as` Follow-up to fc20e61e7249006247b43f84a3189d5a37fa103e.
2025-01-21 09:12:05 -05:00
generator.intern_identifier(as<PrivateIdentifier>(member_expression.property()).string()));
LibJS/Bytecode: Implement optional chaining
2023-06-17 14:50:23 +01:00
} else {
LibJS: Include identifier information in nullish property read access When a GetById / GetByValue bytecode operation results in accessing a nullish object, we now include the name of the property and the object being accessed in the exception message (if available). This should make it easier to debug live websites. For example, the following errors would all previously produce a generic error message of "ToObject on null or undefined": > foo = null > foo.bar Uncaught exception: [TypeError] Cannot access property "bar" on null object "foo" at <unknown> > foo = { bar: undefined } > foo.bar.baz Uncaught exception: [TypeError] Cannot access property "baz" on undefined object "foo.bar" at <unknown> Note we certainly don't capture all possible nullish property read accesses here. This just covers cases I've seen most on live websites; we can cover more cases as they arise.
2024-03-29 11:26:10 -04:00
auto base_identifier = generator.intern_identifier_for_expression(member_expression.object());
AK+Everywhere: Rename `verify_cast` to `as` Follow-up to fc20e61e7249006247b43f84a3189d5a37fa103e.
2025-01-21 09:12:05 -05:00
generator.emit_get_by_id(value, base, generator.intern_identifier(as<Identifier>(member_expression.property()).string()), move(base_identifier));
LibJS/Bytecode: Implement optional chaining
2023-06-17 14:50:23 +01:00
}
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return BaseAndValue { base, value };
LibJS/Bytecode: Implement optional chaining
2023-06-17 14:50:23 +01:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
static Bytecode::CodeGenerationErrorOr<void> generate_optional_chain(Bytecode::Generator& generator, OptionalChain const& optional_chain, ScopedOperand current_value, ScopedOperand current_base, [[maybe_unused]] Optional<ScopedOperand> preferred_dst = {});
LibJS/Bytecode: Implement optional chaining
2023-06-17 14:50:23 +01:00
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> CallExpression::generate_bytecode(Bytecode::Generator& generator, Optional<ScopedOperand> preferred_dst) const
LibJS: Support basic function calls in the bytecode world :^) This patch adds the Call bytecode instruction which is emitted for the CallExpression AST node. It's pretty barebones and doesn't handle 'this' values properly, etc. But it can perform basic function calls! :^) Note that the called function will *not* execute as bytecode, but will simply fall back into the old codepath and use the AST interpreter.
2021-06-05 15:15:30 +02:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS: Support basic function calls in the bytecode world :^) This patch adds the Call bytecode instruction which is emitted for the CallExpression AST node. It's pretty barebones and doesn't handle 'this' values properly, etc. But it can perform basic function calls! :^) Note that the called function will *not* execute as bytecode, but will simply fall back into the old codepath and use the AST interpreter.
2021-06-05 15:15:30 +02:00
LibJS: Introduce Builtins Builtins are functions that can be detected during bytecode generation and enable fast-paths in the JIT.
2023-11-17 11:48:30 +01:00
Optional<Bytecode::Builtin> builtin;
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Optional<ScopedOperand> original_callee;
LibJS: Preserve the original `this` value As shown in the test added by this patch, it was possible to re-assign the `this` value of a member function call while it was executing. Let's copy the original this value like we already do with the callee. Fixes #2226.
2024-11-08 17:59:12 +01:00
auto original_this_value = generator.add_constant(js_undefined());
LibJS: Split `Call` Instruction by `CallType` Instead of branching on the `CallType` at runtime in a hot instruction like `Call`, lets emit separate instructions for each call type during codegen.
2024-10-31 22:47:30 +01:00
Bytecode::Op::CallType call_type = Bytecode::Op::CallType::Call;
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
LibJS: Resolve the `this' value in call expression bytecode
2021-06-11 01:36:10 +04:30
if (is<NewExpression>(this)) {
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
original_callee = TRY(m_callee->generate_bytecode(generator)).value();
LibJS: Split `Call` Instruction by `CallType` Instead of branching on the `CallType` at runtime in a hot instruction like `Call`, lets emit separate instructions for each call type during codegen.
2024-10-31 22:47:30 +01:00
call_type = Bytecode::Op::CallType::Construct;
LibJS: Resolve the `this' value in call expression bytecode
2021-06-11 01:36:10 +04:30
} else if (is<MemberExpression>(*m_callee)) {
Everywhere: Run clang-format
2022-04-01 20:58:27 +03:00
auto& member_expression = static_cast<MemberExpression const&>(*m_callee);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto base_and_value = TRY(get_base_and_value_from_member_expression(generator, member_expression));
original_callee = base_and_value.value;
LibJS: Preserve the original `this` value As shown in the test added by this patch, it was possible to re-assign the `this` value of a member function call while it was executing. Let's copy the original this value like we already do with the callee. Fixes #2226.
2024-11-08 17:59:12 +01:00
original_this_value = base_and_value.base;
LibJS: Introduce Builtins Builtins are functions that can be detected during bytecode generation and enable fast-paths in the JIT.
2023-11-17 11:48:30 +01:00
builtin = Bytecode::get_builtin(member_expression);
LibJS/Bytecode: Implement optional chaining
2023-06-17 14:50:23 +01:00
} else if (is<OptionalChain>(*m_callee)) {
auto& optional_chain = static_cast<OptionalChain const&>(*m_callee);
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
original_callee = generator.allocate_register();
LibJS: Preserve the original `this` value As shown in the test added by this patch, it was possible to re-assign the `this` value of a member function call while it was executing. Let's copy the original this value like we already do with the callee. Fixes #2226.
2024-11-08 17:59:12 +01:00
original_this_value = generator.allocate_register();
TRY(generate_optional_chain(generator, optional_chain, *original_callee, original_this_value));
LibJS: Use correct `this` value when callee is a `with` binding If we're inside of a `with` statement scope, we have to take care to extract the correct `this` value for use in calls when calling a method on the binding object via an Identifier instead of a MemberExpression. This makes Vue.js work way better in the bytecode VM. :^) Also, 1 new pass on test262.
2023-08-01 14:33:58 +02:00
} else if (is<Identifier>(*m_callee)) {
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
// If the original_callee is an identifier, we may need to extract a `this` value.
LibJS: Use correct `this` value when callee is a `with` binding If we're inside of a `with` statement scope, we have to take care to extract the correct `this` value for use in calls when calling a method on the binding object via an Identifier instead of a MemberExpression. This makes Vue.js work way better in the bytecode VM. :^) Also, 1 new pass on test262.
2023-08-01 14:33:58 +02:00
// This is important when we're inside a `with` statement and calling a method on
// the environment's binding object.
// NOTE: If the identifier refers to a known "local" or "global", we know it can't be
// a `with` binding, so we can skip this.
auto& identifier = static_cast<Identifier const&>(*m_callee);
LibJS: Split `Call` Instruction by `CallType` Instead of branching on the `CallType` at runtime in a hot instruction like `Call`, lets emit separate instructions for each call type during codegen.
2024-10-31 22:47:30 +01:00
if (identifier.string() == "eval"sv) {
call_type = Bytecode::Op::CallType::DirectEval;
}
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
if (identifier.is_local()) {
LibJS: Skip allocating locals for arguments that allowed to be local This allows us to get rid of instructions that move arguments to locals and allocate smaller JS::Value vector in ExecutionContext by reusing slots that were already allocated for arguments. With this change for following function: ```js function f(x, y) { return x + y; } ``` we now produce following bytecode: ``` [ 0] 0: Add dst:reg6, lhs:arg0, rhs:arg1 [ 10] Return value:reg6 ``` instead of: ``` [ 0] 0: GetArgument 0, dst:x~1 [ 10] GetArgument 1, dst:y~0 [ 20] Add dst:reg6, lhs:x~1, rhs:y~0 [ 30] Return value:reg6 ```
2025-04-25 17:10:47 +02:00
auto local = generator.local(identifier.local_index());
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
if (!generator.is_local_initialized(local.operand().index())) {
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::ThrowIfTDZ>(local);
}
original_callee = local;
} else if (identifier.is_global()) {
original_callee = m_callee->generate_bytecode(generator).value();
LibJS: Use correct `this` value when callee is a `with` binding If we're inside of a `with` statement scope, we have to take care to extract the correct `this` value for use in calls when calling a method on the binding object via an Identifier instead of a MemberExpression. This makes Vue.js work way better in the bytecode VM. :^) Also, 1 new pass on test262.
2023-08-01 14:33:58 +02:00
} else {
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
original_callee = generator.allocate_register();
LibJS: Preserve the original `this` value As shown in the test added by this patch, it was possible to re-assign the `this` value of a member function call while it was executing. Let's copy the original this value like we already do with the callee. Fixes #2226.
2024-11-08 17:59:12 +01:00
original_this_value = generator.allocate_register();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::GetCalleeAndThisFromEnvironment>(
*original_callee,
LibJS: Preserve the original `this` value As shown in the test added by this patch, it was possible to re-assign the `this` value of a member function call while it was executing. Let's copy the original this value like we already do with the callee. Fixes #2226.
2024-11-08 17:59:12 +01:00
original_this_value,
LibJS/Bytecode: Move environment variable caches into instructions These were out-of-line because we had some ideas about marking instruction streams PROT_READ only, but that seems pretty arbitrary and there's a lot of performance to be gained by putting these inline.
2024-05-11 18:28:03 +02:00
generator.intern_identifier(identifier.string()));
LibJS: Use correct `this` value when callee is a `with` binding If we're inside of a `with` statement scope, we have to take care to extract the correct `this` value for use in calls when calling a method on the binding object via an Identifier instead of a MemberExpression. This makes Vue.js work way better in the bytecode VM. :^) Also, 1 new pass on test262.
2023-08-01 14:33:58 +02:00
}
LibJS: Resolve the `this' value in call expression bytecode
2021-06-11 01:36:10 +04:30
} else {
// FIXME: this = global object in sloppy mode.
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
original_callee = TRY(m_callee->generate_bytecode(generator)).value();
LibJS: Resolve the `this' value in call expression bytecode
2021-06-11 01:36:10 +04:30
}
LibJS: Preserve the original `this` value As shown in the test added by this patch, it was possible to re-assign the `this` value of a member function call while it was executing. Let's copy the original this value like we already do with the callee. Fixes #2226.
2024-11-08 17:59:12 +01:00
// NOTE: If the callee/this value isn't already a temporary, we copy them to new registers
// to avoid overwriting them while evaluating arguments.
// Example: foo.bar(Object.getPrototypeOf(foo).bar = null, foo = null)
auto this_value = generator.copy_if_needed_to_preserve_evaluation_order(original_this_value);
LibJS/Bytecode: Add and use copy_if_needed_to_preserve_evaluation_order This is a new Bytecode::Generator helper that takes an operand and returns the same operand, or a copy of it, in case a copy is required to preserve correct evaluation order. This can be used in a bunch of places where we're worried about clobbering some value after obtaining it. Practically, locals are always copied, and temporary registers as well as constants are returned as-is.
2024-06-01 10:00:32 +02:00
auto callee = generator.copy_if_needed_to_preserve_evaluation_order(original_callee.value());
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
LibJS: Forward a string aproximation of the CallExpression to Call Ops This gives us better debug output when analysing calls to `undefined` and also fixes multiple test-js cases expecting an `(evaluated from $Expression)` in the error message. This also refactors out the generation of that string, to avoid code duplication with the AST interpreter.
2022-10-01 01:36:06 +02:00
Optional<Bytecode::StringTableIndex> expression_string_index;
if (auto expression_string = this->expression_string(); expression_string.has_value())
expression_string_index = generator.intern_string(expression_string.release_value());
LibJS/Bytecode: Add Call opcode for fixed-argument-count calls This avoids the overhead of allocating a new Array on every function call, saving a substantial amount of time and avoiding GC thrash. This patch only makes use of Op::Call in CallExpression. There are other places we should codegen this op. We should also do the same for super expression calls. ~5% speed-up on Kraken/stanford-crypto-ccm.js
2023-07-02 16:33:00 +02:00
bool has_spread = any_of(arguments(), [](auto& argument) { return argument.is_spread; });
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto dst = choose_dst(generator, preferred_dst);
LibJS/Bytecode: Add Call opcode for fixed-argument-count calls This avoids the overhead of allocating a new Array on every function call, saving a substantial amount of time and avoiding GC thrash. This patch only makes use of Op::Call in CallExpression. There are other places we should codegen this op. We should also do the same for super expression calls. ~5% speed-up on Kraken/stanford-crypto-ccm.js
2023-07-02 16:33:00 +02:00
if (has_spread) {
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto arguments = TRY(arguments_to_array_for_call(generator, this->arguments())).value();
generator.emit<Bytecode::Op::CallWithArgumentArray>(call_type, dst, callee, this_value, arguments, expression_string_index);
LibJS/Bytecode: Add Call opcode for fixed-argument-count calls This avoids the overhead of allocating a new Array on every function call, saving a substantial amount of time and avoiding GC thrash. This patch only makes use of Op::Call in CallExpression. There are other places we should codegen this op. We should also do the same for super expression calls. ~5% speed-up on Kraken/stanford-crypto-ccm.js
2023-07-02 16:33:00 +02:00
} else {
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Vector<ScopedOperand> argument_operands;
LibJS/Bytecode: Make NewArray a variable-length instruction This removes a layer of indirection in the bytecode where we had to make sure all the initializer elements were laid out in sequential registers. Array expressions no longer clobber registers permanently, and they can be reused immediately afterwards.
2024-05-08 12:43:08 +02:00
argument_operands.ensure_capacity(arguments().size());
LibJS/Bytecode: Add Call opcode for fixed-argument-count calls This avoids the overhead of allocating a new Array on every function call, saving a substantial amount of time and avoiding GC thrash. This patch only makes use of Op::Call in CallExpression. There are other places we should codegen this op. We should also do the same for super expression calls. ~5% speed-up on Kraken/stanford-crypto-ccm.js
2023-07-02 16:33:00 +02:00
for (auto const& argument : arguments()) {
LibJS: Fix bug where argument++ happened before call For this case to work correctly in the current bytecode world: func(a, a++) We have to put the function arguments in temporaries instead of allowing the postfix increment to modify `a` in place. This fixes a problem where jQuery.each() would skip over items.
2024-04-27 16:04:09 +02:00
auto argument_value = TRY(argument.value->generate_bytecode(generator)).value();
LibJS/Bytecode: Add and use copy_if_needed_to_preserve_evaluation_order This is a new Bytecode::Generator helper that takes an operand and returns the same operand, or a copy of it, in case a copy is required to preserve correct evaluation order. This can be used in a bunch of places where we're worried about clobbering some value after obtaining it. Practically, locals are always copied, and temporary registers as well as constants are returned as-is.
2024-06-01 10:00:32 +02:00
argument_operands.append(generator.copy_if_needed_to_preserve_evaluation_order(argument_value));
LibJS/Bytecode: Add Call opcode for fixed-argument-count calls This avoids the overhead of allocating a new Array on every function call, saving a substantial amount of time and avoiding GC thrash. This patch only makes use of Op::Call in CallExpression. There are other places we should codegen this op. We should also do the same for super expression calls. ~5% speed-up on Kraken/stanford-crypto-ccm.js
2023-07-02 16:33:00 +02:00
}
LibJS: Split `Call` Instruction by `CallType` Instead of branching on the `CallType` at runtime in a hot instruction like `Call`, lets emit separate instructions for each call type during codegen.
2024-10-31 22:47:30 +01:00
if (builtin.has_value()) {
VERIFY(call_type == Op::CallType::Call);
generator.emit_with_extra_operand_slots<Bytecode::Op::CallBuiltin>(
argument_operands.size(),
dst,
callee,
this_value,
argument_operands,
builtin.value(),
expression_string_index);
} else if (call_type == Op::CallType::Construct) {
generator.emit_with_extra_operand_slots<Bytecode::Op::CallConstruct>(
argument_operands.size(),
dst,
callee,
argument_operands,
expression_string_index);
} else if (call_type == Op::CallType::DirectEval) {
generator.emit_with_extra_operand_slots<Bytecode::Op::CallDirectEval>(
argument_operands.size(),
dst,
callee,
this_value,
argument_operands,
expression_string_index);
} else {
generator.emit_with_extra_operand_slots<Bytecode::Op::Call>(
argument_operands.size(),
dst,
callee,
this_value,
argument_operands,
expression_string_index);
}
LibJS/Bytecode: Add Call opcode for fixed-argument-count calls This avoids the overhead of allocating a new Array on every function call, saving a substantial amount of time and avoiding GC thrash. This patch only makes use of Op::Call in CallExpression. There are other places we should codegen this op. We should also do the same for super expression calls. ~5% speed-up on Kraken/stanford-crypto-ccm.js
2023-07-02 16:33:00 +02:00
}
LibJS: Forward a string aproximation of the CallExpression to Call Ops This gives us better debug output when analysing calls to `undefined` and also fixes multiple test-js cases expecting an `(evaluated from $Expression)` in the error message. This also refactors out the generation of that string, to avoid code duplication with the AST interpreter.
2022-10-01 01:36:06 +02:00
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return dst;
LibJS: Support basic function calls in the bytecode world :^) This patch adds the Call bytecode instruction which is emitted for the CallExpression AST node. It's pretty barebones and doesn't handle 'this' values properly, etc. But it can perform basic function calls! :^) Note that the called function will *not* execute as bytecode, but will simply fall back into the old codepath and use the AST interpreter.
2021-06-05 15:15:30 +02:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
static ScopedOperand generate_await(
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
Bytecode::Generator& generator,
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
ScopedOperand argument,
ScopedOperand received_completion,
ScopedOperand received_completion_type,
LibJS: Make async functions & generators faster with helper types Instead of returning internal generator results as ordinary JS::Objects with properties, we now use GeneratorResult and CompletionCell which both inherit from Cell directly and allow efficient access to state. 1.59x speedup on JetStream3/lazy-collections.js :^)
2025-03-31 09:32:39 +01:00
ScopedOperand received_completion_value);
LibJS: Implement await properly for async functions Fixes #20275 ``` Summary: Diff Tests: +4 ✅ -4 ❌ Diff Tests: test/built-ins/Array/fromAsync/non-iterable-input-with-thenable -async-mapped-awaits-callback-result-once.js ❌ -> ✅ test/language/expressions/await/async-await-interleaved.js ❌ -> ✅ test/language/expressions/await/await-awaits-thenables-that- throw.js ❌ -> ✅ test/language/expressions/await/await-awaits-thenables.js ❌ -> ✅ ```
2023-08-09 22:12:07 +01:00
// https://tc39.es/ecma262/#sec-return-statement-runtime-semantics-evaluation
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> ReturnStatement::generate_bytecode(Bytecode::Generator& generator, Optional<ScopedOperand>) const
LibJS: Compile ScriptFunctions into bytecode and run them that way :^) If there's a current Bytecode::Interpreter in action, ScriptFunction will now compile itself into bytecode and execute in that context. This patch also adds the Return bytecode instruction so that we can actually return values from called functions. :^) Return values are propagated from callee to caller via the caller's $0 register. Bytecode::Interpreter now keeps a stack of register "windows". These are not very efficient, but it should be pretty straightforward to convert them to e.g a sliding register window architecture later on. This is pretty dang cool! :^)
2021-06-05 15:53:36 +02:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Optional<ScopedOperand> return_value;
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
LibJS: Implement await properly for async functions Fixes #20275 ``` Summary: Diff Tests: +4 ✅ -4 ❌ Diff Tests: test/built-ins/Array/fromAsync/non-iterable-input-with-thenable -async-mapped-awaits-callback-result-once.js ❌ -> ✅ test/language/expressions/await/async-await-interleaved.js ❌ -> ✅ test/language/expressions/await/await-awaits-thenables-that- throw.js ❌ -> ✅ test/language/expressions/await/await-awaits-thenables.js ❌ -> ✅ ```
2023-08-09 22:12:07 +01:00
if (m_argument) {
// ReturnStatement : return Expression ;
// 1. Let exprRef be ? Evaluation of Expression.
// 2. Let exprValue be ? GetValue(exprRef).
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return_value = TRY(m_argument->generate_bytecode(generator)).value();
LibJS: Implement await properly for async functions Fixes #20275 ``` Summary: Diff Tests: +4 ✅ -4 ❌ Diff Tests: test/built-ins/Array/fromAsync/non-iterable-input-with-thenable -async-mapped-awaits-callback-result-once.js ❌ -> ✅ test/language/expressions/await/async-await-interleaved.js ❌ -> ✅ test/language/expressions/await/await-awaits-thenables-that- throw.js ❌ -> ✅ test/language/expressions/await/await-awaits-thenables.js ❌ -> ✅ ```
2023-08-09 22:12:07 +01:00
// 3. If GetGeneratorKind() is async, set exprValue to ? Await(exprValue).
// Spec Issue?: The spec doesn't seem to do implicit await on explicit return for async functions, but does for
// async generators. However, the major engines do so, and this is observable via constructor lookups
// on Promise objects and custom thenables.
// See: https://tc39.es/ecma262/#sec-asyncblockstart
// c. Assert: If we return here, the async function either threw an exception or performed an implicit or explicit return; all awaiting is done.
if (generator.is_in_async_function()) {
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto received_completion = generator.allocate_register();
auto received_completion_type = generator.allocate_register();
auto received_completion_value = generator.allocate_register();
LibJS: Make async functions & generators faster with helper types Instead of returning internal generator results as ordinary JS::Objects with properties, we now use GeneratorResult and CompletionCell which both inherit from Cell directly and allow efficient access to state. 1.59x speedup on JetStream3/lazy-collections.js :^)
2025-03-31 09:32:39 +01:00
return_value = generate_await(generator, *return_value, received_completion, received_completion_type, received_completion_value);
LibJS: Implement await properly for async functions Fixes #20275 ``` Summary: Diff Tests: +4 ✅ -4 ❌ Diff Tests: test/built-ins/Array/fromAsync/non-iterable-input-with-thenable -async-mapped-awaits-callback-result-once.js ❌ -> ✅ test/language/expressions/await/async-await-interleaved.js ❌ -> ✅ test/language/expressions/await/await-awaits-thenables-that- throw.js ❌ -> ✅ test/language/expressions/await/await-awaits-thenables.js ❌ -> ✅ ```
2023-08-09 22:12:07 +01:00
}
// 4. Return Completion Record { [[Type]]: return, [[Value]]: exprValue, [[Target]]: empty }.
} else {
// ReturnStatement : return ;
// 1. Return Completion Record { [[Type]]: return, [[Value]]: undefined, [[Target]]: empty }.
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return_value = generator.add_constant(js_undefined());
LibJS: Implement await properly for async functions Fixes #20275 ``` Summary: Diff Tests: +4 ✅ -4 ❌ Diff Tests: test/built-ins/Array/fromAsync/non-iterable-input-with-thenable -async-mapped-awaits-callback-result-once.js ❌ -> ✅ test/language/expressions/await/async-await-interleaved.js ❌ -> ✅ test/language/expressions/await/await-awaits-thenables-that- throw.js ❌ -> ✅ test/language/expressions/await/await-awaits-thenables.js ❌ -> ✅ ```
2023-08-09 22:12:07 +01:00
}
LibJS: Implement generator functions (only in bytecode mode)
2021-06-11 01:38:30 +04:30
LibJS: Make return control flow more static With this only `ContinuePendingUnwind` needs to dynamically check if a scheduled return needs to go through a `finally` block, making the interpreter loop a bit nicer
2024-05-12 11:03:26 +02:00
if (generator.is_in_generator_or_async_function())
generator.emit_return<Bytecode::Op::Yield>(return_value.value());
else
generator.emit_return<Bytecode::Op::Return>(return_value.value());
LibJS: Make ASTNode::generate_bytecode() fallible Instead of crashing on the spot, return a descriptive error that will eventually continue its days as a javascript "InternalError" exception. This should make random crashes with BC less likely.
2022-02-12 19:54:08 +03:30
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return return_value;
LibJS: Implement generator functions (only in bytecode mode)
2021-06-11 01:38:30 +04:30
}
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
static void get_received_completion_type_and_value(
Bytecode::Generator& generator,
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
ScopedOperand received_completion,
ScopedOperand received_completion_type,
LibJS: Make async functions & generators faster with helper types Instead of returning internal generator results as ordinary JS::Objects with properties, we now use GeneratorResult and CompletionCell which both inherit from Cell directly and allow efficient access to state. 1.59x speedup on JetStream3/lazy-collections.js :^)
2025-03-31 09:32:39 +01:00
ScopedOperand received_completion_value)
LibJS/Bytecode: Implement async generators
2023-07-14 21:57:49 +01:00
{
LibJS: Make async functions & generators faster with helper types Instead of returning internal generator results as ordinary JS::Objects with properties, we now use GeneratorResult and CompletionCell which both inherit from Cell directly and allow efficient access to state. 1.59x speedup on JetStream3/lazy-collections.js :^)
2025-03-31 09:32:39 +01:00
generator.emit<Op::GetCompletionFields>(received_completion_type, received_completion_value, received_completion);
LibJS/Bytecode: Implement async generators
2023-07-14 21:57:49 +01:00
}
enum class AwaitBeforeYield {
No,
Yes,
};
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
static void generate_yield(Bytecode::Generator& generator,
Bytecode::Label continuation_label,
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
ScopedOperand argument,
ScopedOperand received_completion,
ScopedOperand received_completion_type,
ScopedOperand received_completion_value,
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
AwaitBeforeYield await_before_yield)
LibJS/Bytecode: Implement async generators
2023-07-14 21:57:49 +01:00
{
if (!generator.is_in_async_generator_function()) {
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::Yield>(Bytecode::Label { continuation_label }, argument);
LibJS/Bytecode: Implement async generators
2023-07-14 21:57:49 +01:00
return;
}
if (await_before_yield == AwaitBeforeYield::Yes)
LibJS: Make async functions & generators faster with helper types Instead of returning internal generator results as ordinary JS::Objects with properties, we now use GeneratorResult and CompletionCell which both inherit from Cell directly and allow efficient access to state. 1.59x speedup on JetStream3/lazy-collections.js :^)
2025-03-31 09:32:39 +01:00
argument = generate_await(generator, argument, received_completion, received_completion_type, received_completion_value);
LibJS/Bytecode: Implement async generators
2023-07-14 21:57:49 +01:00
auto& unwrap_yield_resumption_block = generator.make_block();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::Yield>(Bytecode::Label { unwrap_yield_resumption_block }, argument);
LibJS/Bytecode: Implement async generators
2023-07-14 21:57:49 +01:00
generator.switch_to_basic_block(unwrap_yield_resumption_block);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(received_completion, generator.accumulator());
LibJS: Make async functions & generators faster with helper types Instead of returning internal generator results as ordinary JS::Objects with properties, we now use GeneratorResult and CompletionCell which both inherit from Cell directly and allow efficient access to state. 1.59x speedup on JetStream3/lazy-collections.js :^)
2025-03-31 09:32:39 +01:00
get_received_completion_type_and_value(generator, received_completion, received_completion_type, received_completion_value);
LibJS/Bytecode: Implement async generators
2023-07-14 21:57:49 +01:00
// 27.6.3.7 AsyncGeneratorUnwrapYieldResumption ( resumptionValue ), https://tc39.es/ecma262/#sec-asyncgeneratorunwrapyieldresumption
// 1. If resumptionValue.[[Type]] is not return, return ? resumptionValue.
auto& resumption_value_type_is_return_block = generator.make_block();
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto resumption_value_type_is_not_return_result = generator.allocate_register();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::StrictlyInequals>(
resumption_value_type_is_not_return_result,
received_completion_type,
generator.add_constant(Value(to_underlying(Completion::Type::Return))));
LibJS/Bytecode: Do basic compare-and-jump peephole optimization We now fuse sequences like [LessThan, JumpIf] to JumpLessThan. This is only allowed for temporaries (i.e VM registers) with no other references to them.
2024-05-09 15:13:31 +02:00
generator.emit_jump_if(
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
resumption_value_type_is_not_return_result,
Bytecode::Label { continuation_label },
LibJS/Bytecode: Implement async generators
2023-07-14 21:57:49 +01:00
Bytecode::Label { resumption_value_type_is_return_block });
generator.switch_to_basic_block(resumption_value_type_is_return_block);
// 2. Let awaited be Completion(Await(resumptionValue.[[Value]])).
LibJS: Make async functions & generators faster with helper types Instead of returning internal generator results as ordinary JS::Objects with properties, we now use GeneratorResult and CompletionCell which both inherit from Cell directly and allow efficient access to state. 1.59x speedup on JetStream3/lazy-collections.js :^)
2025-03-31 09:32:39 +01:00
generate_await(generator, received_completion_value, received_completion, received_completion_type, received_completion_value);
LibJS/Bytecode: Implement async generators
2023-07-14 21:57:49 +01:00
// 3. If awaited.[[Type]] is throw, return ? awaited.
auto& awaited_type_is_normal_block = generator.make_block();
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto awaited_type_is_throw_result = generator.allocate_register();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::StrictlyEquals>(
awaited_type_is_throw_result,
received_completion_type,
generator.add_constant(Value(to_underlying(Completion::Type::Throw))));
LibJS/Bytecode: Do basic compare-and-jump peephole optimization We now fuse sequences like [LessThan, JumpIf] to JumpLessThan. This is only allowed for temporaries (i.e VM registers) with no other references to them.
2024-05-09 15:13:31 +02:00
generator.emit_jump_if(
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
awaited_type_is_throw_result,
Bytecode::Label { continuation_label },
LibJS/Bytecode: Implement async generators
2023-07-14 21:57:49 +01:00
Bytecode::Label { awaited_type_is_normal_block });
// 4. Assert: awaited.[[Type]] is normal.
generator.switch_to_basic_block(awaited_type_is_normal_block);
// 5. Return Completion Record { [[Type]]: return, [[Value]]: awaited.[[Value]], [[Target]]: empty }.
LibJS: Make async functions & generators faster with helper types Instead of returning internal generator results as ordinary JS::Objects with properties, we now use GeneratorResult and CompletionCell which both inherit from Cell directly and allow efficient access to state. 1.59x speedup on JetStream3/lazy-collections.js :^)
2025-03-31 09:32:39 +01:00
generator.emit<Bytecode::Op::SetCompletionType>(received_completion, Completion::Type::Return);
LibJS/Bytecode: Implement async generators
2023-07-14 21:57:49 +01:00
generator.emit<Bytecode::Op::Jump>(continuation_label);
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> YieldExpression::generate_bytecode(Bytecode::Generator& generator, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS: Implement generator functions (only in bytecode mode)
2021-06-11 01:38:30 +04:30
{
LibJS: Save and restore exceptions on yields in finalizers Also removes a bunch of related old FIXMEs.
2024-05-06 22:38:43 +02:00
// Note: We need to catch any scheduled exceptions and reschedule them on re-entry
// as the act of yielding would otherwise clear them out
// This only applies when we are in a finalizer
bool is_in_finalizer = generator.is_in_finalizer();
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Optional<ScopedOperand> saved_exception;
LibJS: Save and restore exceptions on yields in finalizers Also removes a bunch of related old FIXMEs.
2024-05-06 22:38:43 +02:00
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS: Implement generator functions (only in bytecode mode)
2021-06-11 01:38:30 +04:30
VERIFY(generator.is_in_generator_function());
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto received_completion = generator.allocate_register();
auto received_completion_type = generator.allocate_register();
auto received_completion_value = generator.allocate_register();
LibJS: Perform received abrupt generator completions in the generator Previously, throw and return completions would not be executed inside the generator. This is incorrect, as throw and return need to perform unwinds which can potentially execute more code inside the generator, such as finally blocks. This is done by also passing the completion type alongside the passed in value. The continuation block will immediately extract and type and value and perform the appropriate operation for the given type. For normal completions, this is continuing as normal. For throw completions, it will perform `throw <value>`. For return completions, it will perform `return <value>`, which is a `Yield return` in this case due to being inside a generator. This also refactors GeneratorObject to properly send across the completion type and value to the generator inside of trying to operate on the completions itself. This is a prerequisite for yield*, as it performs special iterator operations when receiving a throw/return completion and does not complete the generator like the regular yield would. There's still more work to be done to make GeneratorObject::execute be closer to the spec. It's mostly a restructuring of the existing GeneratorObject::next_impl.
2022-11-25 23:14:08 +00:00
LibJS: Make ASTNode::generate_bytecode() fallible Instead of crashing on the spot, return a descriptive error that will eventually continue its days as a javascript "InternalError" exception. This should make random crashes with BC less likely.
2022-02-12 19:54:08 +03:30
if (m_is_yield_from) {
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
// 15.5.5 Runtime Semantics: Evaluation, https://tc39.es/ecma262/#sec-generator-function-definitions-runtime-semantics-evaluation
LibJS/Bytecode: Implement async generators
2023-07-14 21:57:49 +01:00
// 1. Let generatorKind be GetGeneratorKind().
// NOTE: is_in_async_generator_function differentiates the generator kind.
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
// 2. Let exprRef be ? Evaluation of AssignmentExpression.
// 3. Let value be ? GetValue(exprRef).
VERIFY(m_argument);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto value = TRY(m_argument->generate_bytecode(generator)).value();
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
// 4. Let iteratorRecord be ? GetIterator(value, generatorKind).
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto iterator_record = generator.allocate_register();
LibJS/Bytecode: Implement async generators
2023-07-14 21:57:49 +01:00
auto iterator_hint = generator.is_in_async_generator_function() ? IteratorHint::Async : IteratorHint::Sync;
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::GetIterator>(iterator_record, value, iterator_hint);
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
// 5. Let iterator be iteratorRecord.[[Iterator]].
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto iterator = generator.allocate_register();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::GetObjectFromIteratorRecord>(iterator, iterator_record);
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
// Cache iteratorRecord.[[NextMethod]] for use in step 7.a.i.
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto next_method = generator.allocate_register();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::GetNextMethodFromIteratorRecord>(next_method, iterator_record);
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
// 6. Let received be NormalCompletion(undefined).
// See get_received_completion_type_and_value above.
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(received_completion_type, generator.add_constant(Value(to_underlying(Completion::Type::Normal))));
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(received_completion_value, generator.add_constant(js_undefined()));
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
// 7. Repeat,
auto& loop_block = generator.make_block();
auto& continuation_block = generator.make_block();
auto& loop_end_block = generator.make_block();
generator.emit<Bytecode::Op::Jump>(Bytecode::Label { loop_block });
generator.switch_to_basic_block(loop_block);
// a. If received.[[Type]] is normal, then
auto& type_is_normal_block = generator.make_block();
auto& is_type_throw_block = generator.make_block();
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto received_completion_type_register_is_normal = generator.allocate_register();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::StrictlyEquals>(
received_completion_type_register_is_normal,
received_completion_type,
generator.add_constant(Value(to_underlying(Completion::Type::Normal))));
LibJS/Bytecode: Do basic compare-and-jump peephole optimization We now fuse sequences like [LessThan, JumpIf] to JumpLessThan. This is only allowed for temporaries (i.e VM registers) with no other references to them.
2024-05-09 15:13:31 +02:00
generator.emit_jump_if(
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
received_completion_type_register_is_normal,
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
Bytecode::Label { type_is_normal_block },
Bytecode::Label { is_type_throw_block });
generator.switch_to_basic_block(type_is_normal_block);
// i. Let innerResult be ? Call(iteratorRecord.[[NextMethod]], iteratorRecord.[[Iterator]], « received.[[Value]] »).
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto array = generator.allocate_register();
LibJS/Bytecode: Make NewArray a variable-length instruction This removes a layer of indirection in the bytecode where we had to make sure all the initializer elements were laid out in sequential registers. Array expressions no longer clobber registers permanently, and they can be reused immediately afterwards.
2024-05-08 12:43:08 +02:00
generator.emit_with_extra_operand_slots<Bytecode::Op::NewArray>(1, array, ReadonlySpan<ScopedOperand> { &received_completion_value, 1 });
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto inner_result = generator.allocate_register();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::CallWithArgumentArray>(Bytecode::Op::CallType::Call, inner_result, next_method, iterator, array);
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
LibJS/Bytecode: Implement async generators
2023-07-14 21:57:49 +01:00
// ii. If generatorKind is async, set innerResult to ? Await(innerResult).
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
if (generator.is_in_async_generator_function()) {
LibJS: Make async functions & generators faster with helper types Instead of returning internal generator results as ordinary JS::Objects with properties, we now use GeneratorResult and CompletionCell which both inherit from Cell directly and allow efficient access to state. 1.59x speedup on JetStream3/lazy-collections.js :^)
2025-03-31 09:32:39 +01:00
auto new_inner_result = generate_await(generator, inner_result, received_completion, received_completion_type, received_completion_value);
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(inner_result, new_inner_result);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
}
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
// iii. If innerResult is not an Object, throw a TypeError exception.
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::ThrowIfNotObject>(inner_result);
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
// iv. Let done be ? IteratorComplete(innerResult).
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto done = generator.allocate_register();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit_iterator_complete(done, inner_result);
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
// v. If done is true, then
auto& type_is_normal_done_block = generator.make_block();
auto& type_is_normal_not_done_block = generator.make_block();
LibJS/Bytecode: Do basic compare-and-jump peephole optimization We now fuse sequences like [LessThan, JumpIf] to JumpLessThan. This is only allowed for temporaries (i.e VM registers) with no other references to them.
2024-05-09 15:13:31 +02:00
generator.emit_jump_if(
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
done,
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
Bytecode::Label { type_is_normal_done_block },
Bytecode::Label { type_is_normal_not_done_block });
generator.switch_to_basic_block(type_is_normal_done_block);
// 1. Return ? IteratorValue(innerResult).
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto return_value = generator.allocate_register();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit_iterator_value(return_value, inner_result);
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
generator.emit<Bytecode::Op::Jump>(Bytecode::Label { loop_end_block });
generator.switch_to_basic_block(type_is_normal_not_done_block);
LibJS/Bytecode: Implement async generators
2023-07-14 21:57:49 +01:00
// vi. If generatorKind is async, set received to Completion(AsyncGeneratorYield(? IteratorValue(innerResult))).
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
// vii. Else, set received to Completion(GeneratorYield(innerResult)).
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
{
// FIXME: Yield currently only accepts a Value, not an object conforming to the IteratorResult interface, so we have to do an observable lookup of `value` here.
// This only matters for non-async generators.
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto current_value = generator.allocate_register();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit_iterator_value(current_value, inner_result);
LibJS: Save and restore exceptions on yields in finalizers Also removes a bunch of related old FIXMEs.
2024-05-06 22:38:43 +02:00
if (is_in_finalizer) {
saved_exception = generator.allocate_register();
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(Bytecode::Operand(*saved_exception), Bytecode::Operand(Bytecode::Register::exception()));
LibJS: Save and restore exceptions on yields in finalizers Also removes a bunch of related old FIXMEs.
2024-05-06 22:38:43 +02:00
}
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generate_yield(generator,
Bytecode::Label { continuation_block },
current_value,
received_completion,
received_completion_type,
received_completion_value,
AwaitBeforeYield::No);
}
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
// b. Else if received.[[Type]] is throw, then
generator.switch_to_basic_block(is_type_throw_block);
auto& type_is_throw_block = generator.make_block();
auto& type_is_return_block = generator.make_block();
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto received_completion_type_register_is_throw = generator.allocate_register();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::StrictlyEquals>(
received_completion_type_register_is_throw,
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
received_completion_type,
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.add_constant(Value(to_underlying(Completion::Type::Throw))));
LibJS/Bytecode: Do basic compare-and-jump peephole optimization We now fuse sequences like [LessThan, JumpIf] to JumpLessThan. This is only allowed for temporaries (i.e VM registers) with no other references to them.
2024-05-09 15:13:31 +02:00
generator.emit_jump_if(
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
received_completion_type_register_is_throw,
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
Bytecode::Label { type_is_throw_block },
Bytecode::Label { type_is_return_block });
generator.switch_to_basic_block(type_is_throw_block);
// i. Let throw be ? GetMethod(iterator, "throw").
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto throw_method = generator.allocate_register();
LibJS: Use FlyString in PropertyKey instead of DeprecatedFlyString This required dealing with *substantial* fallout.
2025-03-18 18:08:02 -05:00
generator.emit<Bytecode::Op::GetMethod>(throw_method, iterator, generator.intern_identifier("throw"_fly_string));
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
// ii. If throw is not undefined, then
auto& throw_method_is_defined_block = generator.make_block();
auto& throw_method_is_undefined_block = generator.make_block();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::JumpUndefined>(
throw_method,
Bytecode::Label { throw_method_is_undefined_block },
Bytecode::Label { throw_method_is_defined_block });
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
generator.switch_to_basic_block(throw_method_is_defined_block);
// 1. Let innerResult be ? Call(throw, iterator, « received.[[Value]] »).
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto received_value_array = generator.allocate_register();
LibJS/Bytecode: Make NewArray a variable-length instruction This removes a layer of indirection in the bytecode where we had to make sure all the initializer elements were laid out in sequential registers. Array expressions no longer clobber registers permanently, and they can be reused immediately afterwards.
2024-05-08 12:43:08 +02:00
generator.emit_with_extra_operand_slots<Bytecode::Op::NewArray>(1, received_value_array, ReadonlySpan<ScopedOperand> { &received_completion_value, 1 });
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::CallWithArgumentArray>(Bytecode::Op::CallType::Call, inner_result, throw_method, iterator, received_value_array);
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
LibJS/Bytecode: Implement async generators
2023-07-14 21:57:49 +01:00
// 2. If generatorKind is async, set innerResult to ? Await(innerResult).
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
if (generator.is_in_async_generator_function()) {
LibJS: Make async functions & generators faster with helper types Instead of returning internal generator results as ordinary JS::Objects with properties, we now use GeneratorResult and CompletionCell which both inherit from Cell directly and allow efficient access to state. 1.59x speedup on JetStream3/lazy-collections.js :^)
2025-03-31 09:32:39 +01:00
auto new_result = generate_await(generator, inner_result, received_completion, received_completion_type, received_completion_value);
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(inner_result, new_result);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
}
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
// 3. NOTE: Exceptions from the inner iterator throw method are propagated. Normal completions from an inner throw method are processed similarly to an inner next.
// 4. If innerResult is not an Object, throw a TypeError exception.
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::ThrowIfNotObject>(inner_result);
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
// 5. Let done be ? IteratorComplete(innerResult).
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit_iterator_complete(done, inner_result);
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
// 6. If done is true, then
auto& type_is_throw_done_block = generator.make_block();
auto& type_is_throw_not_done_block = generator.make_block();
LibJS/Bytecode: Do basic compare-and-jump peephole optimization We now fuse sequences like [LessThan, JumpIf] to JumpLessThan. This is only allowed for temporaries (i.e VM registers) with no other references to them.
2024-05-09 15:13:31 +02:00
generator.emit_jump_if(
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
done,
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
Bytecode::Label { type_is_throw_done_block },
Bytecode::Label { type_is_throw_not_done_block });
generator.switch_to_basic_block(type_is_throw_done_block);
// a. Return ? IteratorValue(innerResult).
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit_iterator_value(return_value, inner_result);
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
generator.emit<Bytecode::Op::Jump>(Bytecode::Label { loop_end_block });
generator.switch_to_basic_block(type_is_throw_not_done_block);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
{
// 7. If generatorKind is async, set received to Completion(AsyncGeneratorYield(? IteratorValue(innerResult))).
// 8. Else, set received to Completion(GeneratorYield(innerResult)).
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
// FIXME: Yield currently only accepts a Value, not an object conforming to the IteratorResult interface, so we have to do an observable lookup of `value` here.
// This only matters for non-async generators.
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto yield_value = generator.allocate_register();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit_iterator_value(yield_value, inner_result);
LibJS: Make async functions & generators faster with helper types Instead of returning internal generator results as ordinary JS::Objects with properties, we now use GeneratorResult and CompletionCell which both inherit from Cell directly and allow efficient access to state. 1.59x speedup on JetStream3/lazy-collections.js :^)
2025-03-31 09:32:39 +01:00
generate_yield(generator, Bytecode::Label { continuation_block }, yield_value, received_completion, received_completion_type, received_completion_value, AwaitBeforeYield::No);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
}
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
generator.switch_to_basic_block(throw_method_is_undefined_block);
// 1. NOTE: If iterator does not have a throw method, this throw is going to terminate the yield* loop. But first we need to give iterator a chance to clean up.
// 2. Let closeCompletion be Completion Record { [[Type]]: normal, [[Value]]: empty, [[Target]]: empty }.
LibJS/Bytecode: Implement async generators
2023-07-14 21:57:49 +01:00
// 3. If generatorKind is async, perform ? AsyncIteratorClose(iteratorRecord, closeCompletion).
if (generator.is_in_async_generator_function()) {
// FIXME: This performs `await` outside of the generator!
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::AsyncIteratorClose>(iterator_record, Completion::Type::Normal, Optional<Value> {});
LibJS/Bytecode: Implement async generators
2023-07-14 21:57:49 +01:00
}
// 4. Else, perform ? IteratorClose(iteratorRecord, closeCompletion).
else {
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::IteratorClose>(iterator_record, Completion::Type::Normal, Optional<Value> {});
LibJS/Bytecode: Implement async generators
2023-07-14 21:57:49 +01:00
}
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
// 5. NOTE: The next step throws a TypeError to indicate that there was a yield* protocol violation: iterator does not have a throw method.
// 6. Throw a TypeError exception.
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto exception = generator.allocate_register();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::NewTypeError>(exception, generator.intern_string(ErrorType::YieldFromIteratorMissingThrowMethod.message()));
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
generator.perform_needed_unwinds<Bytecode::Op::Throw>();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::Throw>(exception);
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
// c. Else,
// i. Assert: received.[[Type]] is return.
generator.switch_to_basic_block(type_is_return_block);
// ii. Let return be ? GetMethod(iterator, "return").
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto return_method = generator.allocate_register();
LibJS: Use FlyString in PropertyKey instead of DeprecatedFlyString This required dealing with *substantial* fallout.
2025-03-18 18:08:02 -05:00
generator.emit<Bytecode::Op::GetMethod>(return_method, iterator, generator.intern_identifier("return"_fly_string));
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
// iii. If return is undefined, then
auto& return_is_undefined_block = generator.make_block();
auto& return_is_defined_block = generator.make_block();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::JumpUndefined>(
return_method,
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
Bytecode::Label { return_is_undefined_block },
Bytecode::Label { return_is_defined_block });
generator.switch_to_basic_block(return_is_undefined_block);
LibJS/Bytecode: Implement async generators
2023-07-14 21:57:49 +01:00
// 1. If generatorKind is async, set received.[[Value]] to ? Await(received.[[Value]]).
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
if (generator.is_in_async_generator_function()) {
LibJS: Make async functions & generators faster with helper types Instead of returning internal generator results as ordinary JS::Objects with properties, we now use GeneratorResult and CompletionCell which both inherit from Cell directly and allow efficient access to state. 1.59x speedup on JetStream3/lazy-collections.js :^)
2025-03-31 09:32:39 +01:00
generate_await(generator, received_completion_value, received_completion, received_completion_type, received_completion_value);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
}
LibJS/Bytecode: Implement async generators
2023-07-14 21:57:49 +01:00
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
// 2. Return ? received.
// NOTE: This will always be a return completion.
LibJS: Make return control flow more static With this only `ContinuePendingUnwind` needs to dynamically check if a scheduled return needs to go through a `finally` block, making the interpreter loop a bit nicer
2024-05-12 11:03:26 +02:00
generator.emit_return<Bytecode::Op::Yield>(received_completion_value);
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
generator.switch_to_basic_block(return_is_defined_block);
// iv. Let innerReturnResult be ? Call(return, iterator, « received.[[Value]] »).
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto call_array = generator.allocate_register();
LibJS/Bytecode: Make NewArray a variable-length instruction This removes a layer of indirection in the bytecode where we had to make sure all the initializer elements were laid out in sequential registers. Array expressions no longer clobber registers permanently, and they can be reused immediately afterwards.
2024-05-08 12:43:08 +02:00
generator.emit_with_extra_operand_slots<Bytecode::Op::NewArray>(1, call_array, ReadonlySpan<ScopedOperand> { &received_completion_value, 1 });
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto inner_return_result = generator.allocate_register();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::CallWithArgumentArray>(Bytecode::Op::CallType::Call, inner_return_result, return_method, iterator, call_array);
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
LibJS/Bytecode: Implement async generators
2023-07-14 21:57:49 +01:00
// v. If generatorKind is async, set innerReturnResult to ? Await(innerReturnResult).
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
if (generator.is_in_async_generator_function()) {
LibJS: Make async functions & generators faster with helper types Instead of returning internal generator results as ordinary JS::Objects with properties, we now use GeneratorResult and CompletionCell which both inherit from Cell directly and allow efficient access to state. 1.59x speedup on JetStream3/lazy-collections.js :^)
2025-03-31 09:32:39 +01:00
auto new_value = generate_await(generator, inner_return_result, received_completion, received_completion_type, received_completion_value);
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(inner_return_result, new_value);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
}
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
// vi. If innerReturnResult is not an Object, throw a TypeError exception.
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::ThrowIfNotObject>(inner_return_result);
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
// vii. Let done be ? IteratorComplete(innerReturnResult).
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit_iterator_complete(done, inner_return_result);
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
// viii. If done is true, then
auto& type_is_return_done_block = generator.make_block();
auto& type_is_return_not_done_block = generator.make_block();
LibJS/Bytecode: Do basic compare-and-jump peephole optimization We now fuse sequences like [LessThan, JumpIf] to JumpLessThan. This is only allowed for temporaries (i.e VM registers) with no other references to them.
2024-05-09 15:13:31 +02:00
generator.emit_jump_if(
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
done,
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
Bytecode::Label { type_is_return_done_block },
Bytecode::Label { type_is_return_not_done_block });
generator.switch_to_basic_block(type_is_return_done_block);
// 1. Let value be ? IteratorValue(innerReturnResult).
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto inner_return_result_value = generator.allocate_register();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit_iterator_value(inner_return_result_value, inner_return_result);
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
// 2. Return Completion Record { [[Type]]: return, [[Value]]: value, [[Target]]: empty }.
LibJS: Make return control flow more static With this only `ContinuePendingUnwind` needs to dynamically check if a scheduled return needs to go through a `finally` block, making the interpreter loop a bit nicer
2024-05-12 11:03:26 +02:00
generator.emit_return<Bytecode::Op::Yield>(inner_return_result_value);
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
generator.switch_to_basic_block(type_is_return_not_done_block);
LibJS/Bytecode: Implement async generators
2023-07-14 21:57:49 +01:00
// ix. If generatorKind is async, set received to Completion(AsyncGeneratorYield(? IteratorValue(innerReturnResult))).
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
// x. Else, set received to Completion(GeneratorYield(innerReturnResult)).
// FIXME: Yield currently only accepts a Value, not an object conforming to the IteratorResult interface, so we have to do an observable lookup of `value` here.
LibJS/Bytecode: Implement async generators
2023-07-14 21:57:49 +01:00
// This only matters for non-async generators.
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto received = generator.allocate_register();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit_iterator_value(received, inner_return_result);
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
LibJS: Make async functions & generators faster with helper types Instead of returning internal generator results as ordinary JS::Objects with properties, we now use GeneratorResult and CompletionCell which both inherit from Cell directly and allow efficient access to state. 1.59x speedup on JetStream3/lazy-collections.js :^)
2025-03-31 09:32:39 +01:00
generate_yield(generator, Bytecode::Label { continuation_block }, received, received_completion, received_completion_type, received_completion_value, AwaitBeforeYield::No);
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
generator.switch_to_basic_block(continuation_block);
LibJS: Save and restore exceptions on yields in finalizers Also removes a bunch of related old FIXMEs.
2024-05-06 22:38:43 +02:00
if (is_in_finalizer)
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(Bytecode::Operand(Bytecode::Register::exception()), Bytecode::Operand(*saved_exception));
LibJS: Save and restore exceptions on yields in finalizers Also removes a bunch of related old FIXMEs.
2024-05-06 22:38:43 +02:00
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(received_completion, generator.accumulator());
LibJS: Make async functions & generators faster with helper types Instead of returning internal generator results as ordinary JS::Objects with properties, we now use GeneratorResult and CompletionCell which both inherit from Cell directly and allow efficient access to state. 1.59x speedup on JetStream3/lazy-collections.js :^)
2025-03-31 09:32:39 +01:00
get_received_completion_type_and_value(generator, received_completion, received_completion_type, received_completion_value);
LibJS/Bytecode: Implement yield*
2022-12-09 18:48:57 +00:00
generator.emit<Bytecode::Op::Jump>(Bytecode::Label { loop_block });
generator.switch_to_basic_block(loop_end_block);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return return_value;
LibJS: Make ASTNode::generate_bytecode() fallible Instead of crashing on the spot, return a descriptive error that will eventually continue its days as a javascript "InternalError" exception. This should make random crashes with BC less likely.
2022-02-12 19:54:08 +03:30
}
LibJS: Correctly parse yield-from expressions This commit implements parsing for `yield *expr`, and the multiple ways something can or can't be parsed like that. Also makes yield-from a TODO in the bytecode generator. Behold, the glory of javascript syntax: ```js // 'yield' = expression in generators. function* foo() { yield *bar; // <- Syntax error here, expression can't start with * } // 'yield' = identifier anywhere else. function foo() { yield *bar; // Perfectly fine, this is just `yield * bar` } ```
2021-06-14 15:46:41 +04:30
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Optional<ScopedOperand> argument;
LibJS: Implement generator functions (only in bytecode mode)
2021-06-11 01:38:30 +04:30
if (m_argument)
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
argument = TRY(m_argument->generate_bytecode(generator)).value();
LibJS/Bytecode: Make `yield` by itself yield undefined
2022-11-25 23:14:27 +00:00
else
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
argument = generator.add_constant(js_undefined());
LibJS: Implement generator functions (only in bytecode mode)
2021-06-11 01:38:30 +04:30
auto& continuation_block = generator.make_block();
LibJS: Save and restore exceptions on yields in finalizers Also removes a bunch of related old FIXMEs.
2024-05-06 22:38:43 +02:00
if (is_in_finalizer) {
saved_exception = generator.allocate_register();
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(Bytecode::Operand(*saved_exception), Bytecode::Operand(Bytecode::Register::exception()));
LibJS: Save and restore exceptions on yields in finalizers Also removes a bunch of related old FIXMEs.
2024-05-06 22:38:43 +02:00
}
LibJS: Make async functions & generators faster with helper types Instead of returning internal generator results as ordinary JS::Objects with properties, we now use GeneratorResult and CompletionCell which both inherit from Cell directly and allow efficient access to state. 1.59x speedup on JetStream3/lazy-collections.js :^)
2025-03-31 09:32:39 +01:00
generate_yield(generator, Bytecode::Label { continuation_block }, *argument, received_completion, received_completion_type, received_completion_value, AwaitBeforeYield::Yes);
LibJS: Implement generator functions (only in bytecode mode)
2021-06-11 01:38:30 +04:30
generator.switch_to_basic_block(continuation_block);
LibJS: Save and restore exceptions on yields in finalizers Also removes a bunch of related old FIXMEs.
2024-05-06 22:38:43 +02:00
if (is_in_finalizer)
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(Bytecode::Operand(Bytecode::Register::exception()), Bytecode::Operand(*saved_exception));
LibJS: Save and restore exceptions on yields in finalizers Also removes a bunch of related old FIXMEs.
2024-05-06 22:38:43 +02:00
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(received_completion, generator.accumulator());
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
LibJS: Make async functions & generators faster with helper types Instead of returning internal generator results as ordinary JS::Objects with properties, we now use GeneratorResult and CompletionCell which both inherit from Cell directly and allow efficient access to state. 1.59x speedup on JetStream3/lazy-collections.js :^)
2025-03-31 09:32:39 +01:00
get_received_completion_type_and_value(generator, received_completion, received_completion_type, received_completion_value);
LibJS: Perform received abrupt generator completions in the generator Previously, throw and return completions would not be executed inside the generator. This is incorrect, as throw and return need to perform unwinds which can potentially execute more code inside the generator, such as finally blocks. This is done by also passing the completion type alongside the passed in value. The continuation block will immediately extract and type and value and perform the appropriate operation for the given type. For normal completions, this is continuing as normal. For throw completions, it will perform `throw <value>`. For return completions, it will perform `return <value>`, which is a `Yield return` in this case due to being inside a generator. This also refactors GeneratorObject to properly send across the completion type and value to the generator inside of trying to operate on the completions itself. This is a prerequisite for yield*, as it performs special iterator operations when receiving a throw/return completion and does not complete the generator like the regular yield would. There's still more work to be done to make GeneratorObject::execute be closer to the spec. It's mostly a restructuring of the existing GeneratorObject::next_impl.
2022-11-25 23:14:08 +00:00
auto& normal_completion_continuation_block = generator.make_block();
auto& throw_completion_continuation_block = generator.make_block();
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto received_completion_type_is_normal = generator.allocate_register();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::StrictlyEquals>(
received_completion_type_is_normal,
received_completion_type,
generator.add_constant(Value(to_underlying(Completion::Type::Normal))));
LibJS/Bytecode: Do basic compare-and-jump peephole optimization We now fuse sequences like [LessThan, JumpIf] to JumpLessThan. This is only allowed for temporaries (i.e VM registers) with no other references to them.
2024-05-09 15:13:31 +02:00
generator.emit_jump_if(
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
received_completion_type_is_normal,
LibJS: Perform received abrupt generator completions in the generator Previously, throw and return completions would not be executed inside the generator. This is incorrect, as throw and return need to perform unwinds which can potentially execute more code inside the generator, such as finally blocks. This is done by also passing the completion type alongside the passed in value. The continuation block will immediately extract and type and value and perform the appropriate operation for the given type. For normal completions, this is continuing as normal. For throw completions, it will perform `throw <value>`. For return completions, it will perform `return <value>`, which is a `Yield return` in this case due to being inside a generator. This also refactors GeneratorObject to properly send across the completion type and value to the generator inside of trying to operate on the completions itself. This is a prerequisite for yield*, as it performs special iterator operations when receiving a throw/return completion and does not complete the generator like the regular yield would. There's still more work to be done to make GeneratorObject::execute be closer to the spec. It's mostly a restructuring of the existing GeneratorObject::next_impl.
2022-11-25 23:14:08 +00:00
Bytecode::Label { normal_completion_continuation_block },
Bytecode::Label { throw_completion_continuation_block });
auto& throw_value_block = generator.make_block();
auto& return_value_block = generator.make_block();
generator.switch_to_basic_block(throw_completion_continuation_block);
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto received_completion_type_is_throw = generator.allocate_register();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::StrictlyEquals>(
received_completion_type_is_throw,
received_completion_type,
generator.add_constant(Value(to_underlying(Completion::Type::Throw))));
LibJS: Perform received abrupt generator completions in the generator Previously, throw and return completions would not be executed inside the generator. This is incorrect, as throw and return need to perform unwinds which can potentially execute more code inside the generator, such as finally blocks. This is done by also passing the completion type alongside the passed in value. The continuation block will immediately extract and type and value and perform the appropriate operation for the given type. For normal completions, this is continuing as normal. For throw completions, it will perform `throw <value>`. For return completions, it will perform `return <value>`, which is a `Yield return` in this case due to being inside a generator. This also refactors GeneratorObject to properly send across the completion type and value to the generator inside of trying to operate on the completions itself. This is a prerequisite for yield*, as it performs special iterator operations when receiving a throw/return completion and does not complete the generator like the regular yield would. There's still more work to be done to make GeneratorObject::execute be closer to the spec. It's mostly a restructuring of the existing GeneratorObject::next_impl.
2022-11-25 23:14:08 +00:00
// If type is not equal to "throw" or "normal", assume it's "return".
LibJS/Bytecode: Do basic compare-and-jump peephole optimization We now fuse sequences like [LessThan, JumpIf] to JumpLessThan. This is only allowed for temporaries (i.e VM registers) with no other references to them.
2024-05-09 15:13:31 +02:00
generator.emit_jump_if(
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
received_completion_type_is_throw,
LibJS: Perform received abrupt generator completions in the generator Previously, throw and return completions would not be executed inside the generator. This is incorrect, as throw and return need to perform unwinds which can potentially execute more code inside the generator, such as finally blocks. This is done by also passing the completion type alongside the passed in value. The continuation block will immediately extract and type and value and perform the appropriate operation for the given type. For normal completions, this is continuing as normal. For throw completions, it will perform `throw <value>`. For return completions, it will perform `return <value>`, which is a `Yield return` in this case due to being inside a generator. This also refactors GeneratorObject to properly send across the completion type and value to the generator inside of trying to operate on the completions itself. This is a prerequisite for yield*, as it performs special iterator operations when receiving a throw/return completion and does not complete the generator like the regular yield would. There's still more work to be done to make GeneratorObject::execute be closer to the spec. It's mostly a restructuring of the existing GeneratorObject::next_impl.
2022-11-25 23:14:08 +00:00
Bytecode::Label { throw_value_block },
Bytecode::Label { return_value_block });
generator.switch_to_basic_block(throw_value_block);
generator.perform_needed_unwinds<Bytecode::Op::Throw>();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::Throw>(received_completion_value);
LibJS: Perform received abrupt generator completions in the generator Previously, throw and return completions would not be executed inside the generator. This is incorrect, as throw and return need to perform unwinds which can potentially execute more code inside the generator, such as finally blocks. This is done by also passing the completion type alongside the passed in value. The continuation block will immediately extract and type and value and perform the appropriate operation for the given type. For normal completions, this is continuing as normal. For throw completions, it will perform `throw <value>`. For return completions, it will perform `return <value>`, which is a `Yield return` in this case due to being inside a generator. This also refactors GeneratorObject to properly send across the completion type and value to the generator inside of trying to operate on the completions itself. This is a prerequisite for yield*, as it performs special iterator operations when receiving a throw/return completion and does not complete the generator like the regular yield would. There's still more work to be done to make GeneratorObject::execute be closer to the spec. It's mostly a restructuring of the existing GeneratorObject::next_impl.
2022-11-25 23:14:08 +00:00
generator.switch_to_basic_block(return_value_block);
LibJS: Make return control flow more static With this only `ContinuePendingUnwind` needs to dynamically check if a scheduled return needs to go through a `finally` block, making the interpreter loop a bit nicer
2024-05-12 11:03:26 +02:00
generator.emit_return<Bytecode::Op::Yield>(received_completion_value);
LibJS: Perform received abrupt generator completions in the generator Previously, throw and return completions would not be executed inside the generator. This is incorrect, as throw and return need to perform unwinds which can potentially execute more code inside the generator, such as finally blocks. This is done by also passing the completion type alongside the passed in value. The continuation block will immediately extract and type and value and perform the appropriate operation for the given type. For normal completions, this is continuing as normal. For throw completions, it will perform `throw <value>`. For return completions, it will perform `return <value>`, which is a `Yield return` in this case due to being inside a generator. This also refactors GeneratorObject to properly send across the completion type and value to the generator inside of trying to operate on the completions itself. This is a prerequisite for yield*, as it performs special iterator operations when receiving a throw/return completion and does not complete the generator like the regular yield would. There's still more work to be done to make GeneratorObject::execute be closer to the spec. It's mostly a restructuring of the existing GeneratorObject::next_impl.
2022-11-25 23:14:08 +00:00
generator.switch_to_basic_block(normal_completion_continuation_block);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return received_completion_value;
LibJS: Compile ScriptFunctions into bytecode and run them that way :^) If there's a current Bytecode::Interpreter in action, ScriptFunction will now compile itself into bytecode and execute in that context. This patch also adds the Return bytecode instruction so that we can actually return values from called functions. :^) Return values are propagated from callee to caller via the caller's $0 register. Bytecode::Interpreter now keeps a stack of register "windows". These are not very efficient, but it should be pretty straightforward to convert them to e.g a sliding register window architecture later on. This is pretty dang cool! :^)
2021-06-05 15:53:36 +02:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> IfStatement::generate_bytecode(Bytecode::Generator& generator, Optional<ScopedOperand> preferred_dst) const
LibJS: Add basic "if" statement support to the bytecode VM :^) This also required making Bytecode::Op::Jump support lazy linking to a target label. I left a FIXME here about having the "if" statement return the result value from the taken branch statement. That's what the AST interpreter does but I'm not sure if it's actually required.
2021-06-06 13:26:50 +02:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS: Generate bytecode in basic blocks instead of one big block This limits the size of each block (currently set to 1K), and gets us closer to a canonical, more easily analysable bytecode format. As a result of this, "Labels" are now simply entries to basic blocks. Since there is no more 'conditional' jump (as all jumps are always taken), JumpIf{True,False} are unified to JumpConditional, and JumpIfNullish is renamed to JumpNullish. Also fixes #7914 as a result of reimplementing the loop logic.
2021-06-09 06:49:58 +04:30
// test
// jump if_true (true) true (false) false
// true
// jump always (true) end
// false
// jump always (true) end
// end
auto& true_block = generator.make_block();
auto& false_block = generator.make_block();
LibJS: Don't generate useless jumps for if statement If statements without an else clause generated jumps to the next instruction, this commit fixes the if statement generation so that it dosen't produce them anymore. This is an example of JS code that generates the useless jumps (a => if(a){}) ();
2024-10-26 15:18:47 +02:00
// NOTE: if there is no 'else' block the end block is the same as the false block
auto& end_block = m_alternate ? generator.make_block() : false_block;
LibJS: Generate bytecode in basic blocks instead of one big block This limits the size of each block (currently set to 1K), and gets us closer to a canonical, more easily analysable bytecode format. As a result of this, "Labels" are now simply entries to basic blocks. Since there is no more 'conditional' jump (as all jumps are always taken), JumpIf{True,False} are unified to JumpConditional, and JumpIfNullish is renamed to JumpNullish. Also fixes #7914 as a result of reimplementing the loop logic.
2021-06-09 06:49:58 +04:30
LibJS/Bytecode: Don't bother propagating completion values in functions The last completion value in a function is not exposed to the language, since functions always either return something, or undefined. Given this, we can avoid emitting code that propagates the completion value from various statements, as long as we know we're generating code for a context where the completion value is not accessible. In practical terms, this means that function code gets to do less completion shuffling, while global and eval code has to keep doing it.
2024-05-14 10:57:06 +02:00
Optional<ScopedOperand> completion;
if (generator.must_propagate_completion()) {
completion = choose_dst(generator, preferred_dst);
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(*completion, generator.add_constant(js_undefined()));
LibJS/Bytecode: Don't bother propagating completion values in functions The last completion value in a function is not exposed to the language, since functions always either return something, or undefined. Given this, we can avoid emitting code that propagates the completion value from various statements, as long as we know we're generating code for a context where the completion value is not accessible. In practical terms, this means that function code gets to do less completion shuffling, while global and eval code has to keep doing it.
2024-05-14 10:57:06 +02:00
}
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto predicate = TRY(m_predicate->generate_bytecode(generator)).value();
LibJS/Bytecode: Do basic compare-and-jump peephole optimization We now fuse sequences like [LessThan, JumpIf] to JumpLessThan. This is only allowed for temporaries (i.e VM registers) with no other references to them.
2024-05-09 15:13:31 +02:00
generator.emit_jump_if(
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
predicate,
LibJS: Generate bytecode in basic blocks instead of one big block This limits the size of each block (currently set to 1K), and gets us closer to a canonical, more easily analysable bytecode format. As a result of this, "Labels" are now simply entries to basic blocks. Since there is no more 'conditional' jump (as all jumps are always taken), JumpIf{True,False} are unified to JumpConditional, and JumpIfNullish is renamed to JumpNullish. Also fixes #7914 as a result of reimplementing the loop logic.
2021-06-09 06:49:58 +04:30
Bytecode::Label { true_block },
Bytecode::Label { false_block });
generator.switch_to_basic_block(true_block);
LibJS/Bytecode: Don't bother propagating completion values in functions The last completion value in a function is not exposed to the language, since functions always either return something, or undefined. Given this, we can avoid emitting code that propagates the completion value from various statements, as long as we know we're generating code for a context where the completion value is not accessible. In practical terms, this means that function code gets to do less completion shuffling, while global and eval code has to keep doing it.
2024-05-14 10:57:06 +02:00
auto consequent = TRY(m_consequent->generate_bytecode(generator, completion));
LibJS: Remove almost all uses of Op::Jump::set_targets() We should initialize jump targets when constructing the jump instruction instead of doing it later. This was already the case in all construction sites but one. This first patch converts all those sites to pass final targets to the constructor directly.
2023-09-28 12:43:11 +02:00
if (!generator.is_current_block_terminated()) {
LibJS: Don't generate useless jumps for if statement If statements without an else clause generated jumps to the next instruction, this commit fixes the if statement generation so that it dosen't produce them anymore. This is an example of JS code that generates the useless jumps (a => if(a){}) ();
2024-10-26 15:18:47 +02:00
if (generator.must_propagate_completion() && consequent.has_value())
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(*completion, *consequent);
LibJS: Remove last user of Op::Jump::set_targets() and API itself This was just a matter of instantiating a BasicBlock earlier so we can reference it when making the jump.
2023-09-28 12:46:17 +02:00
generator.emit<Bytecode::Op::Jump>(Bytecode::Label { end_block });
LibJS: Remove almost all uses of Op::Jump::set_targets() We should initialize jump targets when constructing the jump instruction instead of doing it later. This was already the case in all construction sites but one. This first patch converts all those sites to pass final targets to the constructor directly.
2023-09-28 12:43:11 +02:00
}
LibJS: Generate bytecode in basic blocks instead of one big block This limits the size of each block (currently set to 1K), and gets us closer to a canonical, more easily analysable bytecode format. As a result of this, "Labels" are now simply entries to basic blocks. Since there is no more 'conditional' jump (as all jumps are always taken), JumpIf{True,False} are unified to JumpConditional, and JumpIfNullish is renamed to JumpNullish. Also fixes #7914 as a result of reimplementing the loop logic.
2021-06-09 06:49:58 +04:30
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
if (m_alternate) {
LibJS: Don't generate useless jumps for if statement If statements without an else clause generated jumps to the next instruction, this commit fixes the if statement generation so that it dosen't produce them anymore. This is an example of JS code that generates the useless jumps (a => if(a){}) ();
2024-10-26 15:18:47 +02:00
generator.switch_to_basic_block(false_block);
auto alternate = TRY(m_alternate->generate_bytecode(generator, completion));
if (!generator.is_current_block_terminated()) {
if (generator.must_propagate_completion() && alternate.has_value())
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(*completion, *alternate);
LibJS: Don't generate useless jumps for if statement If statements without an else clause generated jumps to the next instruction, this commit fixes the if statement generation so that it dosen't produce them anymore. This is an example of JS code that generates the useless jumps (a => if(a){}) ();
2024-10-26 15:18:47 +02:00
generator.emit<Bytecode::Op::Jump>(Bytecode::Label { end_block });
LibJS/Bytecode: Don't bother propagating completion values in functions The last completion value in a function is not exposed to the language, since functions always either return something, or undefined. Given this, we can avoid emitting code that propagates the completion value from various statements, as long as we know we're generating code for a context where the completion value is not accessible. In practical terms, this means that function code gets to do less completion shuffling, while global and eval code has to keep doing it.
2024-05-14 10:57:06 +02:00
}
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
}
LibJS: Generate bytecode in basic blocks instead of one big block This limits the size of each block (currently set to 1K), and gets us closer to a canonical, more easily analysable bytecode format. As a result of this, "Labels" are now simply entries to basic blocks. Since there is no more 'conditional' jump (as all jumps are always taken), JumpIf{True,False} are unified to JumpConditional, and JumpIfNullish is renamed to JumpNullish. Also fixes #7914 as a result of reimplementing the loop logic.
2021-06-09 06:49:58 +04:30
LibJS: Let if yield undefined for branches that don't yield a value According to 13.6.7 the return value for if expressions should be undefined when the branch statements don't yield a value.
2021-06-20 12:38:59 +02:00
generator.switch_to_basic_block(end_block);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
LibJS/Bytecode: Don't bother propagating completion values in functions The last completion value in a function is not exposed to the language, since functions always either return something, or undefined. Given this, we can avoid emitting code that propagates the completion value from various statements, as long as we know we're generating code for a context where the completion value is not accessible. In practical terms, this means that function code gets to do less completion shuffling, while global and eval code has to keep doing it.
2024-05-14 10:57:06 +02:00
return completion;
LibJS: Add basic "if" statement support to the bytecode VM :^) This also required making Bytecode::Op::Jump support lazy linking to a target label. I left a FIXME here about having the "if" statement return the result value from the taken branch statement. That's what the AST interpreter does but I'm not sure if it's actually required.
2021-06-06 13:26:50 +02:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> ContinueStatement::generate_bytecode(Bytecode::Generator& generator, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS: Add basic support for "continue" in the bytecode VM Unlike the convoluted unwind-until-scope-type mechanism in the AST interpreter, "continue" maps to a simple Bytecode::Op::Jump here. :^) We know where to jump based on a stack of "continuable scopes" that we now maintain on the Bytecode::Generator as we go. Note that this only supports bare "continue", not continue-with-label.
2021-06-06 13:33:02 +02:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS: Don't use null DFS for break/continue statements without a label
2024-01-24 13:32:02 -05:00
if (!m_target_label.has_value()) {
LibJS: Generate unwind chains for continue in Bytecode This works similar to `break` The `try-finally-continue` still do not pass with this, likely because of binding issues.
2022-11-25 16:35:39 +01:00
generator.generate_continue();
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
return Optional<ScopedOperand> {};
LibJS/Bytecode: Implement break/continue labels This is done by keeping track of all the labels that apply to a given break/continue scope alongside their bytecode target. When a break/continue with a label is generated, we scan from the most inner scope to the most outer scope looking for the label, performing any necessary unwinds on the way. Once the label is found, it is then jumped to.
2022-06-11 23:09:37 +01:00
}
LibJS: Don't use null DFS for break/continue statements without a label
2024-01-24 13:32:02 -05:00
generator.generate_continue(m_target_label.value());
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
return Optional<ScopedOperand> {};
LibJS: Add basic support for "continue" in the bytecode VM Unlike the convoluted unwind-until-scope-type mechanism in the AST interpreter, "continue" maps to a simple Bytecode::Op::Jump here. :^) We know where to jump based on a stack of "continuable scopes" that we now maintain on the Bytecode::Generator as we go. Note that this only supports bare "continue", not continue-with-label.
2021-06-06 13:33:02 +02:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> DebuggerStatement::generate_bytecode(Bytecode::Generator&, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS: Add bytecode generation for DebuggerStatement No-op. :^)
2021-06-07 20:05:50 +01:00
{
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
return Optional<ScopedOperand> {};
LibJS: Add bytecode generation for DebuggerStatement No-op. :^)
2021-06-07 20:05:50 +01:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> ConditionalExpression::generate_bytecode(Bytecode::Generator& generator, Optional<ScopedOperand> preferred_dst) const
LibJS: Add conditional expression bytecode generation Or, by its more common name, the ternary operator :^)
2021-06-08 04:54:34 +01:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS: Generate bytecode in basic blocks instead of one big block This limits the size of each block (currently set to 1K), and gets us closer to a canonical, more easily analysable bytecode format. As a result of this, "Labels" are now simply entries to basic blocks. Since there is no more 'conditional' jump (as all jumps are always taken), JumpIf{True,False} are unified to JumpConditional, and JumpIfNullish is renamed to JumpNullish. Also fixes #7914 as a result of reimplementing the loop logic.
2021-06-09 06:49:58 +04:30
// test
// jump if_true (true) true (false) false
// true
// jump always (true) end
// false
// jump always (true) end
// end
auto& true_block = generator.make_block();
auto& false_block = generator.make_block();
auto& end_block = generator.make_block();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto test = TRY(m_test->generate_bytecode(generator)).value();
LibJS/Bytecode: Do basic compare-and-jump peephole optimization We now fuse sequences like [LessThan, JumpIf] to JumpLessThan. This is only allowed for temporaries (i.e VM registers) with no other references to them.
2024-05-09 15:13:31 +02:00
generator.emit_jump_if(
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
test,
LibJS: Generate bytecode in basic blocks instead of one big block This limits the size of each block (currently set to 1K), and gets us closer to a canonical, more easily analysable bytecode format. As a result of this, "Labels" are now simply entries to basic blocks. Since there is no more 'conditional' jump (as all jumps are always taken), JumpIf{True,False} are unified to JumpConditional, and JumpIfNullish is renamed to JumpNullish. Also fixes #7914 as a result of reimplementing the loop logic.
2021-06-09 06:49:58 +04:30
Bytecode::Label { true_block },
Bytecode::Label { false_block });
LibJS: Add conditional expression bytecode generation Or, by its more common name, the ternary operator :^)
2021-06-08 04:54:34 +01:00
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto dst = choose_dst(generator, preferred_dst);
LibJS: Generate bytecode in basic blocks instead of one big block This limits the size of each block (currently set to 1K), and gets us closer to a canonical, more easily analysable bytecode format. As a result of this, "Labels" are now simply entries to basic blocks. Since there is no more 'conditional' jump (as all jumps are always taken), JumpIf{True,False} are unified to JumpConditional, and JumpIfNullish is renamed to JumpNullish. Also fixes #7914 as a result of reimplementing the loop logic.
2021-06-09 06:49:58 +04:30
generator.switch_to_basic_block(true_block);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto consequent = TRY(m_consequent->generate_bytecode(generator)).value();
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(dst, consequent);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
LibJS: Remove almost all uses of Op::Jump::set_targets() We should initialize jump targets when constructing the jump instruction instead of doing it later. This was already the case in all construction sites but one. This first patch converts all those sites to pass final targets to the constructor directly.
2023-09-28 12:43:11 +02:00
generator.emit<Bytecode::Op::Jump>(Bytecode::Label { end_block });
LibJS: Add conditional expression bytecode generation Or, by its more common name, the ternary operator :^)
2021-06-08 04:54:34 +01:00
LibJS: Generate bytecode in basic blocks instead of one big block This limits the size of each block (currently set to 1K), and gets us closer to a canonical, more easily analysable bytecode format. As a result of this, "Labels" are now simply entries to basic blocks. Since there is no more 'conditional' jump (as all jumps are always taken), JumpIf{True,False} are unified to JumpConditional, and JumpIfNullish is renamed to JumpNullish. Also fixes #7914 as a result of reimplementing the loop logic.
2021-06-09 06:49:58 +04:30
generator.switch_to_basic_block(false_block);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto alternate = TRY(m_alternate->generate_bytecode(generator)).value();
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(dst, alternate);
LibJS: Remove almost all uses of Op::Jump::set_targets() We should initialize jump targets when constructing the jump instruction instead of doing it later. This was already the case in all construction sites but one. This first patch converts all those sites to pass final targets to the constructor directly.
2023-09-28 12:43:11 +02:00
generator.emit<Bytecode::Op::Jump>(Bytecode::Label { end_block });
LibJS: Add conditional expression bytecode generation Or, by its more common name, the ternary operator :^)
2021-06-08 04:54:34 +01:00
LibJS: Generate bytecode in basic blocks instead of one big block This limits the size of each block (currently set to 1K), and gets us closer to a canonical, more easily analysable bytecode format. As a result of this, "Labels" are now simply entries to basic blocks. Since there is no more 'conditional' jump (as all jumps are always taken), JumpIf{True,False} are unified to JumpConditional, and JumpIfNullish is renamed to JumpNullish. Also fixes #7914 as a result of reimplementing the loop logic.
2021-06-09 06:49:58 +04:30
generator.switch_to_basic_block(end_block);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return dst;
LibJS: Add conditional expression bytecode generation Or, by its more common name, the ternary operator :^)
2021-06-08 04:54:34 +01:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> SequenceExpression::generate_bytecode(Bytecode::Generator& generator, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS: Add sequence expression bytecode generation
2021-06-08 10:13:37 +01:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Optional<ScopedOperand> last_value;
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
for (auto& expression : m_expressions) {
last_value = TRY(expression->generate_bytecode(generator));
}
LibJS: Make ASTNode::generate_bytecode() fallible Instead of crashing on the spot, return a descriptive error that will eventually continue its days as a javascript "InternalError" exception. This should make random crashes with BC less likely.
2022-02-12 19:54:08 +03:30
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return last_value;
LibJS: Add sequence expression bytecode generation
2021-06-08 10:13:37 +01:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> TemplateLiteral::generate_bytecode(Bytecode::Generator& generator, Optional<ScopedOperand> preferred_dst) const
LibJS: Generate bytecode for template literals
2021-06-08 19:14:01 +02:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto dst = choose_dst(generator, preferred_dst);
LibJS: Generate bytecode for template literals
2021-06-08 19:14:01 +02:00
LibJS: Introduce an accumulator register to Bytecode::Interpreter This commit introduces the concept of an accumulator register to LibJS's bytecode interpreter. The accumulator register is always register 0, and most simple instructions use it for reading and writing. Not only does this slim down the AST, but it also simplifies a lot of the code. For example, the generate_bytecode methods no longer need to return an Optional<Register>, as any opcode which has a "return" value will always put it into the accumulator. This also renames the old Op::Load to Op::LoadImmediate, and uses Op::Load to load from a register into the accumulator. There is also an Op::Store to put the value in the accumulator into another register.
2021-06-07 20:58:36 -07:00
for (size_t i = 0; i < m_expressions.size(); i++) {
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto value = TRY(m_expressions[i]->generate_bytecode(generator)).value();
LibJS: Introduce an accumulator register to Bytecode::Interpreter This commit introduces the concept of an accumulator register to LibJS's bytecode interpreter. The accumulator register is always register 0, and most simple instructions use it for reading and writing. Not only does this slim down the AST, but it also simplifies a lot of the code. For example, the generate_bytecode methods no longer need to return an Optional<Register>, as any opcode which has a "return" value will always put it into the accumulator. This also renames the old Op::Load to Op::LoadImmediate, and uses Op::Load to load from a register into the accumulator. There is also an Op::Store to put the value in the accumulator into another register.
2021-06-07 20:58:36 -07:00
if (i == 0) {
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(dst, value);
LibJS: Introduce an accumulator register to Bytecode::Interpreter This commit introduces the concept of an accumulator register to LibJS's bytecode interpreter. The accumulator register is always register 0, and most simple instructions use it for reading and writing. Not only does this slim down the AST, but it also simplifies a lot of the code. For example, the generate_bytecode methods no longer need to return an Optional<Register>, as any opcode which has a "return" value will always put it into the accumulator. This also renames the old Op::Load to Op::LoadImmediate, and uses Op::Load to load from a register into the accumulator. There is also an Op::Store to put the value in the accumulator into another register.
2021-06-07 20:58:36 -07:00
} else {
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::ConcatString>(dst, value);
LibJS: Introduce an accumulator register to Bytecode::Interpreter This commit introduces the concept of an accumulator register to LibJS's bytecode interpreter. The accumulator register is always register 0, and most simple instructions use it for reading and writing. Not only does this slim down the AST, but it also simplifies a lot of the code. For example, the generate_bytecode methods no longer need to return an Optional<Register>, as any opcode which has a "return" value will always put it into the accumulator. This also renames the old Op::Load to Op::LoadImmediate, and uses Op::Load to load from a register into the accumulator. There is also an Op::Store to put the value in the accumulator into another register.
2021-06-07 20:58:36 -07:00
}
LibJS: Generate bytecode for template literals
2021-06-08 19:14:01 +02:00
}
LibJS: Fix the return value for TemplateLiteral This ensures that the bytecode generated for TemplateLiterals returns the correct value.
2021-06-09 21:11:04 +02:00
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return dst;
LibJS: Generate bytecode for template literals
2021-06-08 19:14:01 +02:00
}
LibJS: Implement bytecode generation for UpdateExpression :^) Added Increment and Decrement bytecode ops to support this. Postfix updates use a temporary register to preserve the original value. Note that this patch only implements Identifier updates. Member expression updates are a TODO.
2021-06-09 11:40:38 +02:00
LibJS: Use correct this value for tagged template literals with members Required by creepjs, which does Date().split` `[3] to get the current year.
2025-01-16 17:18:19 +00:00
struct TagAndThisValue {
ScopedOperand tag;
ScopedOperand this_value;
};
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> TaggedTemplateLiteral::generate_bytecode(Bytecode::Generator& generator, Optional<ScopedOperand> preferred_dst) const
LibJS: Generate bytecode for tagged template literals
2021-06-09 21:02:24 +02:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS: Use correct this value for tagged template literals with members Required by creepjs, which does Date().split` `[3] to get the current year.
2025-01-16 17:18:19 +00:00
auto [tag, this_value] = TRY([&]() -> CodeGenerationErrorOr<TagAndThisValue> {
if (is<MemberExpression>(*m_tag)) {
auto& member_expression = static_cast<MemberExpression const&>(*m_tag);
auto base_and_value = TRY(get_base_and_value_from_member_expression(generator, member_expression));
return TagAndThisValue { .tag = base_and_value.value, .this_value = base_and_value.base };
}
auto tag = TRY(m_tag->generate_bytecode(generator)).value();
return TagAndThisValue { .tag = tag, .this_value = generator.add_constant(js_undefined()) };
}());
LibJS: Fix evaluation order for tagged template literals This ensures that the tag function is evaluated first.
2021-06-09 22:07:18 +02:00
LibJS: Replace invalid escapes in TemplateLiterals with undefined in BC Also adds a big FIXME, to outline what is still wrong
2023-06-25 12:31:49 +02:00
// FIXME: Follow
// 13.2.8.3 GetTemplateObject ( templateLiteral ), https://tc39.es/ecma262/#sec-gettemplateobject
// more closely, namely:
// * cache this somehow
// * add a raw object accessor
// * freeze array and raw member
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Vector<ScopedOperand> string_regs;
LibJS: Generate bytecode for tagged template literals
2021-06-09 21:02:24 +02:00
auto& expressions = m_template_literal->expressions();
LibJS: Use ranges instead of specifying all registers for NewArray Listing all the registers will lead to the inability to allocate enough space in one basic block (as there can be an arbitrary number of registers used), instead switch to specifying the range of registers used and save a lot of space in the process.
2022-03-14 14:48:42 +00:00
LibJS: Generate bytecode for tagged template literals
2021-06-09 21:02:24 +02:00
for (size_t i = 0; i < expressions.size(); ++i) {
if (i % 2 != 0)
continue;
LibJS: Replace invalid escapes in TemplateLiterals with undefined in BC Also adds a big FIXME, to outline what is still wrong
2023-06-25 12:31:49 +02:00
// NOTE: If the string contains invalid escapes we get a null expression here,
// which we then convert to the expected `undefined` TV. See
// 12.9.6.1 Static Semantics: TV, https://tc39.es/ecma262/#sec-static-semantics-tv
LibJS/Bytecode: Make NewArray a variable-length instruction This removes a layer of indirection in the bytecode where we had to make sure all the initializer elements were laid out in sequential registers. Array expressions no longer clobber registers permanently, and they can be reused immediately afterwards.
2024-05-08 12:43:08 +02:00
auto string_reg = generator.allocate_register();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
if (is<NullLiteral>(expressions[i])) {
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(string_reg, generator.add_constant(js_undefined()));
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
} else {
auto value = TRY(expressions[i]->generate_bytecode(generator)).value();
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(string_reg, value);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
}
LibJS/Bytecode: Make NewArray a variable-length instruction This removes a layer of indirection in the bytecode where we had to make sure all the initializer elements were laid out in sequential registers. Array expressions no longer clobber registers permanently, and they can be reused immediately afterwards.
2024-05-08 12:43:08 +02:00
string_regs.append(move(string_reg));
LibJS: Generate bytecode for tagged template literals
2021-06-09 21:02:24 +02:00
}
LibJS/Bytecode: Make NewArray a variable-length instruction This removes a layer of indirection in the bytecode where we had to make sure all the initializer elements were laid out in sequential registers. Array expressions no longer clobber registers permanently, and they can be reused immediately afterwards.
2024-05-08 12:43:08 +02:00
auto strings_array = generator.allocate_register();
LibJS: Use ranges instead of specifying all registers for NewArray Listing all the registers will lead to the inability to allocate enough space in one basic block (as there can be an arbitrary number of registers used), instead switch to specifying the range of registers used and save a lot of space in the process.
2022-03-14 14:48:42 +00:00
if (string_regs.is_empty()) {
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::NewArray>(strings_array);
LibJS: Use ranges instead of specifying all registers for NewArray Listing all the registers will lead to the inability to allocate enough space in one basic block (as there can be an arbitrary number of registers used), instead switch to specifying the range of registers used and save a lot of space in the process.
2022-03-14 14:48:42 +00:00
} else {
LibJS/Bytecode: Make NewArray a variable-length instruction This removes a layer of indirection in the bytecode where we had to make sure all the initializer elements were laid out in sequential registers. Array expressions no longer clobber registers permanently, and they can be reused immediately afterwards.
2024-05-08 12:43:08 +02:00
generator.emit_with_extra_operand_slots<Bytecode::Op::NewArray>(string_regs.size(), strings_array, string_regs);
LibJS: Use ranges instead of specifying all registers for NewArray Listing all the registers will lead to the inability to allocate enough space in one basic block (as there can be an arbitrary number of registers used), instead switch to specifying the range of registers used and save a lot of space in the process.
2022-03-14 14:48:42 +00:00
}
LibJS: Generate bytecode for tagged template literals
2021-06-09 21:02:24 +02:00
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Vector<ScopedOperand> argument_regs;
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
argument_regs.append(strings_array);
LibJS: Generate bytecode for tagged template literals
2021-06-09 21:02:24 +02:00
LibJS: Switch to array-calls in the bytecode vm This will make it easier to implement spreading arguments.
2022-09-07 23:39:43 +02:00
for (size_t i = 1; i < expressions.size(); i += 2) {
LibJS/Bytecode: Make NewArray a variable-length instruction This removes a layer of indirection in the bytecode where we had to make sure all the initializer elements were laid out in sequential registers. Array expressions no longer clobber registers permanently, and they can be reused immediately afterwards.
2024-05-08 12:43:08 +02:00
auto string_reg = generator.allocate_register();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto string = TRY(expressions[i]->generate_bytecode(generator)).value();
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(string_reg, string);
LibJS/Bytecode: Make NewArray a variable-length instruction This removes a layer of indirection in the bytecode where we had to make sure all the initializer elements were laid out in sequential registers. Array expressions no longer clobber registers permanently, and they can be reused immediately afterwards.
2024-05-08 12:43:08 +02:00
argument_regs.append(move(string_reg));
LibJS: Generate bytecode for tagged template literals
2021-06-09 21:02:24 +02:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Vector<ScopedOperand> raw_string_regs;
LibJS/Bytecode: Make NewArray a variable-length instruction This removes a layer of indirection in the bytecode where we had to make sure all the initializer elements were laid out in sequential registers. Array expressions no longer clobber registers permanently, and they can be reused immediately afterwards.
2024-05-08 12:43:08 +02:00
raw_string_regs.ensure_capacity(m_template_literal->raw_strings().size());
LibJS: Generate bytecode for tagged template literals
2021-06-09 21:02:24 +02:00
for (auto& raw_string : m_template_literal->raw_strings()) {
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto value = TRY(raw_string->generate_bytecode(generator)).value();
LibJS/Bytecode: Add and use copy_if_needed_to_preserve_evaluation_order This is a new Bytecode::Generator helper that takes an operand and returns the same operand, or a copy of it, in case a copy is required to preserve correct evaluation order. This can be used in a bunch of places where we're worried about clobbering some value after obtaining it. Practically, locals are always copied, and temporary registers as well as constants are returned as-is.
2024-06-01 10:00:32 +02:00
raw_string_regs.append(generator.copy_if_needed_to_preserve_evaluation_order(value));
LibJS: Generate bytecode for tagged template literals
2021-06-09 21:02:24 +02:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto raw_strings_array = generator.allocate_register();
LibJS: Use ranges instead of specifying all registers for NewArray Listing all the registers will lead to the inability to allocate enough space in one basic block (as there can be an arbitrary number of registers used), instead switch to specifying the range of registers used and save a lot of space in the process.
2022-03-14 14:48:42 +00:00
if (raw_string_regs.is_empty()) {
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::NewArray>(raw_strings_array);
LibJS: Use ranges instead of specifying all registers for NewArray Listing all the registers will lead to the inability to allocate enough space in one basic block (as there can be an arbitrary number of registers used), instead switch to specifying the range of registers used and save a lot of space in the process.
2022-03-14 14:48:42 +00:00
} else {
LibJS/Bytecode: Make NewArray a variable-length instruction This removes a layer of indirection in the bytecode where we had to make sure all the initializer elements were laid out in sequential registers. Array expressions no longer clobber registers permanently, and they can be reused immediately afterwards.
2024-05-08 12:43:08 +02:00
generator.emit_with_extra_operand_slots<Bytecode::Op::NewArray>(raw_string_regs.size(), raw_strings_array, raw_string_regs);
LibJS: Use ranges instead of specifying all registers for NewArray Listing all the registers will lead to the inability to allocate enough space in one basic block (as there can be an arbitrary number of registers used), instead switch to specifying the range of registers used and save a lot of space in the process.
2022-03-14 14:48:42 +00:00
}
LibJS: Generate bytecode for tagged template literals
2021-06-09 21:02:24 +02:00
LibJS: Use FlyString in PropertyKey instead of DeprecatedFlyString This required dealing with *substantial* fallout.
2025-03-18 18:08:02 -05:00
generator.emit<Bytecode::Op::PutById>(strings_array, generator.intern_identifier("raw"_fly_string), raw_strings_array, Bytecode::Op::PropertyKind::KeyValue, generator.next_property_lookup_cache());
LibJS: Generate bytecode for tagged template literals
2021-06-09 21:02:24 +02:00
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto arguments = generator.allocate_register();
LibJS: Switch to array-calls in the bytecode vm This will make it easier to implement spreading arguments.
2022-09-07 23:39:43 +02:00
if (!argument_regs.is_empty())
LibJS/Bytecode: Make NewArray a variable-length instruction This removes a layer of indirection in the bytecode where we had to make sure all the initializer elements were laid out in sequential registers. Array expressions no longer clobber registers permanently, and they can be reused immediately afterwards.
2024-05-08 12:43:08 +02:00
generator.emit_with_extra_operand_slots<Bytecode::Op::NewArray>(argument_regs.size(), arguments, argument_regs);
LibJS: Switch to array-calls in the bytecode vm This will make it easier to implement spreading arguments.
2022-09-07 23:39:43 +02:00
else
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::NewArray>(arguments);
LibJS: Switch to array-calls in the bytecode vm This will make it easier to implement spreading arguments.
2022-09-07 23:39:43 +02:00
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto dst = choose_dst(generator, preferred_dst);
LibJS: Use correct this value for tagged template literals with members Required by creepjs, which does Date().split` `[3] to get the current year.
2025-01-16 17:18:19 +00:00
generator.emit<Bytecode::Op::CallWithArgumentArray>(Bytecode::Op::CallType::Call, dst, tag, this_value, arguments);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return dst;
LibJS: Generate bytecode for tagged template literals
2021-06-09 21:02:24 +02:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> UpdateExpression::generate_bytecode(Bytecode::Generator& generator, Optional<ScopedOperand>) const
LibJS: Implement bytecode generation for UpdateExpression :^) Added Increment and Decrement bytecode ops to support this. Postfix updates use a temporary register to preserve the original value. Note that this patch only implements Identifier updates. Member expression updates are a TODO.
2021-06-09 11:40:38 +02:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto reference = TRY(generator.emit_load_from_reference(*m_argument));
LibJS: Implement bytecode generation for UpdateExpression :^) Added Increment and Decrement bytecode ops to support this. Postfix updates use a temporary register to preserve the original value. Note that this patch only implements Identifier updates. Member expression updates are a TODO.
2021-06-09 11:40:38 +02:00
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Optional<ScopedOperand> previous_value_for_postfix;
LibJS: Implement bytecode generation for UpdateExpression :^) Added Increment and Decrement bytecode ops to support this. Postfix updates use a temporary register to preserve the original value. Note that this patch only implements Identifier updates. Member expression updates are a TODO.
2021-06-09 11:40:38 +02:00
LibJS/Bytecode: Dedicated instructions for postfix increment/decrement Instead of splitting the postfix variants into ToNumeric + Inc/Dec, we now have dedicated PostfixIncrement and PostfixDecrement instructions that handle both outputs in one go.
2024-02-20 11:45:01 +01:00
if (m_op == UpdateOp::Increment) {
if (m_prefixed) {
generator.emit<Bytecode::Op::Increment>(*reference.loaded_value);
} else {
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
previous_value_for_postfix = generator.allocate_register();
LibJS/Bytecode: Dedicated instructions for postfix increment/decrement Instead of splitting the postfix variants into ToNumeric + Inc/Dec, we now have dedicated PostfixIncrement and PostfixDecrement instructions that handle both outputs in one go.
2024-02-20 11:45:01 +01:00
generator.emit<Bytecode::Op::PostfixIncrement>(*previous_value_for_postfix, *reference.loaded_value);
}
} else {
if (m_prefixed) {
generator.emit<Bytecode::Op::Decrement>(*reference.loaded_value);
} else {
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
previous_value_for_postfix = generator.allocate_register();
LibJS/Bytecode: Dedicated instructions for postfix increment/decrement Instead of splitting the postfix variants into ToNumeric + Inc/Dec, we now have dedicated PostfixIncrement and PostfixDecrement instructions that handle both outputs in one go.
2024-02-20 11:45:01 +01:00
generator.emit<Bytecode::Op::PostfixDecrement>(*previous_value_for_postfix, *reference.loaded_value);
}
}
LibJS: Implement bytecode generation for UpdateExpression :^) Added Increment and Decrement bytecode ops to support this. Postfix updates use a temporary register to preserve the original value. Note that this patch only implements Identifier updates. Member expression updates are a TODO.
2021-06-09 11:40:38 +02:00
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
if (is<Identifier>(*m_argument))
(void)TRY(generator.emit_store_to_reference(static_cast<Identifier const&>(*m_argument), *reference.loaded_value));
LibJS: Don't evaluate computed MemberExpression LHS twice in assignments The following snippet would cause "i" to be incremented twice(!): let a = [] let i = 0 a[++i] += 0 This patch solves the issue by remembering the base object and property name for computed MemberExpression LHS in codegen. We the store the result of the assignment to the same object and property (instead of computing the LHS again). 3 new passes on test262. :^)
2023-10-04 15:22:07 +02:00
else
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
(void)TRY(generator.emit_store_to_reference(reference, *reference.loaded_value));
LibJS: Implement bytecode generation for UpdateExpression :^) Added Increment and Decrement bytecode ops to support this. Postfix updates use a temporary register to preserve the original value. Note that this patch only implements Identifier updates. Member expression updates are a TODO.
2021-06-09 11:40:38 +02:00
LibJS: Generate bytecode for UpdateExpression with MemberExpression arg
2021-10-25 15:17:41 +02:00
if (!m_prefixed)
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return *previous_value_for_postfix;
return *reference.loaded_value;
LibJS: Implement bytecode generation for UpdateExpression :^) Added Increment and Decrement bytecode ops to support this. Postfix updates use a temporary register to preserve the original value. Note that this patch only implements Identifier updates. Member expression updates are a TODO.
2021-06-09 11:40:38 +02:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> ThrowStatement::generate_bytecode(Bytecode::Generator& generator, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS: Generate bytecode for throw statements
2021-06-09 18:18:56 +02:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto argument = TRY(m_argument->generate_bytecode(generator)).value();
LibJS/Bytecode: Unwind to closest unwind boundary on Throw This will leave any lexical/variable environments on the way to the closest unwind context boundary. This will not leave the closest unwind context, as we still need the unwind context to perform the Throw instruction correctly.
2022-03-14 02:26:39 +00:00
generator.perform_needed_unwinds<Bytecode::Op::Throw>();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::Throw>(argument);
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
return Optional<ScopedOperand> {};
LibJS: Generate bytecode for throw statements
2021-06-09 18:18:56 +02:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> BreakStatement::generate_bytecode(Bytecode::Generator& generator, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS: Implement bytecode generation for BreakStatement
2021-06-10 20:28:43 +08:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS: Intercept returns through finally blocks in Bytecode This is still not perfect, as we now actually crash in the `try-finally-continue` tests, while we now succeed all `try-catch-finally-*` tests. Note that we do not yet go through the finally block when exiting the unwind context through a break or continue.
2022-11-13 20:56:53 +01:00
// FIXME: Handle finally blocks in a graceful manner
// We need to execute the finally block, but tell it to resume
// execution at the designated block
LibJS: Don't use null DFS for break/continue statements without a label
2024-01-24 13:32:02 -05:00
if (!m_target_label.has_value()) {
LibJS: Generate unwind chains for break in Bytecode This uses a newly added instruction `ScheduleJump` This instruction tells the finally proceeding it, that instead of jumping to it's next block it should jump to the designated block.
2022-11-25 16:15:34 +01:00
generator.generate_break();
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
return Optional<ScopedOperand> {};
LibJS/Bytecode: Implement break/continue labels This is done by keeping track of all the labels that apply to a given break/continue scope alongside their bytecode target. When a break/continue with a label is generated, we scan from the most inner scope to the most outer scope looking for the label, performing any necessary unwinds on the way. Once the label is found, it is then jumped to.
2022-06-11 23:09:37 +01:00
}
LibJS: Don't use null DFS for break/continue statements without a label
2024-01-24 13:32:02 -05:00
generator.generate_break(m_target_label.value());
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
return Optional<ScopedOperand> {};
LibJS: Implement bytecode generation for BreakStatement
2021-06-10 20:28:43 +08:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> TryStatement::generate_bytecode(Bytecode::Generator& generator, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS: Implement bytecode generation for try..catch..finally EnterUnwindContext pushes an unwind context (exception handler and/or finalizer) onto a stack. LeaveUnwindContext pops the unwind context from that stack. Upon return to the interpreter loop we check whether the VM has an exception pending. If no unwind context is available we return from the loop. If an exception handler is available we clear the VM's exception, put the exception value into the accumulator register, clear the unwind context's handler and jump to the handler. If no handler is available but a finalizer is available we save the exception value + metadata (for later use by ContinuePendingUnwind), clear the VM's exception, pop the unwind context and jump to the finalizer. ContinuePendingUnwind checks whether a saved exception is available. If no saved exception is available it jumps to the resume label. Otherwise it stores the exception into the VM. The Jump after LeaveUnwindContext could be integrated into the LeaveUnwindContext instruction. I've kept them separate for now to make the bytecode more readable. > try { 1; throw "x" } catch (e) { 2 } finally { 3 }; 4 1: [ 0] EnterScope [ 10] EnterUnwindContext handler:@4 finalizer:@3 [ 38] EnterScope [ 48] LoadImmediate 1 [ 60] NewString 1 ("x") [ 70] Throw <for non-terminated blocks: insert LeaveUnwindContext + Jump @3 here> 2: [ 0] LoadImmediate 4 3: [ 0] EnterScope [ 10] LoadImmediate 3 [ 28] ContinuePendingUnwind resume:@2 4: [ 0] SetVariable 0 (e) [ 10] EnterScope [ 20] LoadImmediate 2 [ 38] LeaveUnwindContext [ 3c] Jump @3 String Table: 0: e 1: x
2021-06-10 15:04:38 +02:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS: Implement bytecode generation for try..catch..finally EnterUnwindContext pushes an unwind context (exception handler and/or finalizer) onto a stack. LeaveUnwindContext pops the unwind context from that stack. Upon return to the interpreter loop we check whether the VM has an exception pending. If no unwind context is available we return from the loop. If an exception handler is available we clear the VM's exception, put the exception value into the accumulator register, clear the unwind context's handler and jump to the handler. If no handler is available but a finalizer is available we save the exception value + metadata (for later use by ContinuePendingUnwind), clear the VM's exception, pop the unwind context and jump to the finalizer. ContinuePendingUnwind checks whether a saved exception is available. If no saved exception is available it jumps to the resume label. Otherwise it stores the exception into the VM. The Jump after LeaveUnwindContext could be integrated into the LeaveUnwindContext instruction. I've kept them separate for now to make the bytecode more readable. > try { 1; throw "x" } catch (e) { 2 } finally { 3 }; 4 1: [ 0] EnterScope [ 10] EnterUnwindContext handler:@4 finalizer:@3 [ 38] EnterScope [ 48] LoadImmediate 1 [ 60] NewString 1 ("x") [ 70] Throw <for non-terminated blocks: insert LeaveUnwindContext + Jump @3 here> 2: [ 0] LoadImmediate 4 3: [ 0] EnterScope [ 10] LoadImmediate 3 [ 28] ContinuePendingUnwind resume:@2 4: [ 0] SetVariable 0 (e) [ 10] EnterScope [ 20] LoadImmediate 2 [ 38] LeaveUnwindContext [ 3c] Jump @3 String Table: 0: e 1: x
2021-06-10 15:04:38 +02:00
auto& saved_block = generator.current_block();
Optional<Bytecode::Label> handler_target;
Optional<Bytecode::Label> finalizer_target;
LibJS: Create static unwind mappings for `BasicBlock`s This is currently only used in the bytecode dump to annotate to where unwinds lead per block, but will be hooked up to the virtual machine in the next commit.
2023-10-19 23:18:54 +02:00
Optional<Bytecode::Generator::UnwindContext> unwind_context;
LibJS: Implement bytecode generation for try..catch..finally EnterUnwindContext pushes an unwind context (exception handler and/or finalizer) onto a stack. LeaveUnwindContext pops the unwind context from that stack. Upon return to the interpreter loop we check whether the VM has an exception pending. If no unwind context is available we return from the loop. If an exception handler is available we clear the VM's exception, put the exception value into the accumulator register, clear the unwind context's handler and jump to the handler. If no handler is available but a finalizer is available we save the exception value + metadata (for later use by ContinuePendingUnwind), clear the VM's exception, pop the unwind context and jump to the finalizer. ContinuePendingUnwind checks whether a saved exception is available. If no saved exception is available it jumps to the resume label. Otherwise it stores the exception into the VM. The Jump after LeaveUnwindContext could be integrated into the LeaveUnwindContext instruction. I've kept them separate for now to make the bytecode more readable. > try { 1; throw "x" } catch (e) { 2 } finally { 3 }; 4 1: [ 0] EnterScope [ 10] EnterUnwindContext handler:@4 finalizer:@3 [ 38] EnterScope [ 48] LoadImmediate 1 [ 60] NewString 1 ("x") [ 70] Throw <for non-terminated blocks: insert LeaveUnwindContext + Jump @3 here> 2: [ 0] LoadImmediate 4 3: [ 0] EnterScope [ 10] LoadImmediate 3 [ 28] ContinuePendingUnwind resume:@2 4: [ 0] SetVariable 0 (e) [ 10] EnterScope [ 20] LoadImmediate 2 [ 38] LeaveUnwindContext [ 3c] Jump @3 String Table: 0: e 1: x
2021-06-10 15:04:38 +02:00
Bytecode::BasicBlock* next_block { nullptr };
LibJS/Bytecode: Don't bother propagating completion values in functions The last completion value in a function is not exposed to the language, since functions always either return something, or undefined. Given this, we can avoid emitting code that propagates the completion value from various statements, as long as we know we're generating code for a context where the completion value is not accessible. In practical terms, this means that function code gets to do less completion shuffling, while global and eval code has to keep doing it.
2024-05-14 10:57:06 +02:00
Optional<ScopedOperand> completion;
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
LibJS: Implement bytecode generation for try..catch..finally EnterUnwindContext pushes an unwind context (exception handler and/or finalizer) onto a stack. LeaveUnwindContext pops the unwind context from that stack. Upon return to the interpreter loop we check whether the VM has an exception pending. If no unwind context is available we return from the loop. If an exception handler is available we clear the VM's exception, put the exception value into the accumulator register, clear the unwind context's handler and jump to the handler. If no handler is available but a finalizer is available we save the exception value + metadata (for later use by ContinuePendingUnwind), clear the VM's exception, pop the unwind context and jump to the finalizer. ContinuePendingUnwind checks whether a saved exception is available. If no saved exception is available it jumps to the resume label. Otherwise it stores the exception into the VM. The Jump after LeaveUnwindContext could be integrated into the LeaveUnwindContext instruction. I've kept them separate for now to make the bytecode more readable. > try { 1; throw "x" } catch (e) { 2 } finally { 3 }; 4 1: [ 0] EnterScope [ 10] EnterUnwindContext handler:@4 finalizer:@3 [ 38] EnterScope [ 48] LoadImmediate 1 [ 60] NewString 1 ("x") [ 70] Throw <for non-terminated blocks: insert LeaveUnwindContext + Jump @3 here> 2: [ 0] LoadImmediate 4 3: [ 0] EnterScope [ 10] LoadImmediate 3 [ 28] ContinuePendingUnwind resume:@2 4: [ 0] SetVariable 0 (e) [ 10] EnterScope [ 20] LoadImmediate 2 [ 38] LeaveUnwindContext [ 3c] Jump @3 String Table: 0: e 1: x
2021-06-10 15:04:38 +02:00
if (m_finalizer) {
LibJS: Generate unwind chains for break in Bytecode This uses a newly added instruction `ScheduleJump` This instruction tells the finally proceeding it, that instead of jumping to it's next block it should jump to the designated block.
2022-11-25 16:15:34 +01:00
// FIXME: See notes in Op.h->ScheduleJump
LibJS: Implement bytecode generation for try..catch..finally EnterUnwindContext pushes an unwind context (exception handler and/or finalizer) onto a stack. LeaveUnwindContext pops the unwind context from that stack. Upon return to the interpreter loop we check whether the VM has an exception pending. If no unwind context is available we return from the loop. If an exception handler is available we clear the VM's exception, put the exception value into the accumulator register, clear the unwind context's handler and jump to the handler. If no handler is available but a finalizer is available we save the exception value + metadata (for later use by ContinuePendingUnwind), clear the VM's exception, pop the unwind context and jump to the finalizer. ContinuePendingUnwind checks whether a saved exception is available. If no saved exception is available it jumps to the resume label. Otherwise it stores the exception into the VM. The Jump after LeaveUnwindContext could be integrated into the LeaveUnwindContext instruction. I've kept them separate for now to make the bytecode more readable. > try { 1; throw "x" } catch (e) { 2 } finally { 3 }; 4 1: [ 0] EnterScope [ 10] EnterUnwindContext handler:@4 finalizer:@3 [ 38] EnterScope [ 48] LoadImmediate 1 [ 60] NewString 1 ("x") [ 70] Throw <for non-terminated blocks: insert LeaveUnwindContext + Jump @3 here> 2: [ 0] LoadImmediate 4 3: [ 0] EnterScope [ 10] LoadImmediate 3 [ 28] ContinuePendingUnwind resume:@2 4: [ 0] SetVariable 0 (e) [ 10] EnterScope [ 20] LoadImmediate 2 [ 38] LeaveUnwindContext [ 3c] Jump @3 String Table: 0: e 1: x
2021-06-10 15:04:38 +02:00
auto& finalizer_block = generator.make_block();
generator.switch_to_basic_block(finalizer_block);
LibJS: Leave unwind contexts on enter of finally blocks in Bytecode Before we were doing so while exiting the catch-block, but not when exiting the try-block. This now centralizes the responsibility to exit the unwind context to the finalizer, ignoring return/break/continue. This makes it easier to handle the return case in a future commit.
2022-11-13 15:58:36 +01:00
generator.emit<Bytecode::Op::LeaveUnwindContext>();
LibJS: Cleanup unwind state when transferring control out of a finalizer This does two things: * Clear exceptions when transferring control out of a finalizer Otherwise they would resurface at the end of the next finalizer (see test the new test case), or at the end of a function * Pop one scheduled jump when transferring control out of a finalizer This removes one old FIXME
2024-04-11 11:58:18 +02:00
generator.start_boundary(Bytecode::Generator::BlockBoundaryType::LeaveFinally);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
(void)TRY(m_finalizer->generate_bytecode(generator));
LibJS: Cleanup unwind state when transferring control out of a finalizer This does two things: * Clear exceptions when transferring control out of a finalizer Otherwise they would resurface at the end of the next finalizer (see test the new test case), or at the end of a function * Pop one scheduled jump when transferring control out of a finalizer This removes one old FIXME
2024-04-11 11:58:18 +02:00
generator.end_boundary(Bytecode::Generator::BlockBoundaryType::LeaveFinally);
LibJS: Implement bytecode generation for try..catch..finally EnterUnwindContext pushes an unwind context (exception handler and/or finalizer) onto a stack. LeaveUnwindContext pops the unwind context from that stack. Upon return to the interpreter loop we check whether the VM has an exception pending. If no unwind context is available we return from the loop. If an exception handler is available we clear the VM's exception, put the exception value into the accumulator register, clear the unwind context's handler and jump to the handler. If no handler is available but a finalizer is available we save the exception value + metadata (for later use by ContinuePendingUnwind), clear the VM's exception, pop the unwind context and jump to the finalizer. ContinuePendingUnwind checks whether a saved exception is available. If no saved exception is available it jumps to the resume label. Otherwise it stores the exception into the VM. The Jump after LeaveUnwindContext could be integrated into the LeaveUnwindContext instruction. I've kept them separate for now to make the bytecode more readable. > try { 1; throw "x" } catch (e) { 2 } finally { 3 }; 4 1: [ 0] EnterScope [ 10] EnterUnwindContext handler:@4 finalizer:@3 [ 38] EnterScope [ 48] LoadImmediate 1 [ 60] NewString 1 ("x") [ 70] Throw <for non-terminated blocks: insert LeaveUnwindContext + Jump @3 here> 2: [ 0] LoadImmediate 4 3: [ 0] EnterScope [ 10] LoadImmediate 3 [ 28] ContinuePendingUnwind resume:@2 4: [ 0] SetVariable 0 (e) [ 10] EnterScope [ 20] LoadImmediate 2 [ 38] LeaveUnwindContext [ 3c] Jump @3 String Table: 0: e 1: x
2021-06-10 15:04:38 +02:00
if (!generator.is_current_block_terminated()) {
next_block = &generator.make_block();
auto next_target = Bytecode::Label { *next_block };
generator.emit<Bytecode::Op::ContinuePendingUnwind>(next_target);
}
finalizer_target = Bytecode::Label { finalizer_block };
LibJS: Intercept returns through finally blocks in Bytecode This is still not perfect, as we now actually crash in the `try-finally-continue` tests, while we now succeed all `try-catch-finally-*` tests. Note that we do not yet go through the finally block when exiting the unwind context through a break or continue.
2022-11-13 20:56:53 +01:00
generator.start_boundary(Bytecode::Generator::BlockBoundaryType::ReturnToFinally);
LibJS: Create static unwind mappings for `BasicBlock`s This is currently only used in the bytecode dump to annotate to where unwinds lead per block, but will be hooked up to the virtual machine in the next commit.
2023-10-19 23:18:54 +02:00
unwind_context.emplace(generator, finalizer_target);
}
LibJS: Implement bytecode generation for try..catch..finally EnterUnwindContext pushes an unwind context (exception handler and/or finalizer) onto a stack. LeaveUnwindContext pops the unwind context from that stack. Upon return to the interpreter loop we check whether the VM has an exception pending. If no unwind context is available we return from the loop. If an exception handler is available we clear the VM's exception, put the exception value into the accumulator register, clear the unwind context's handler and jump to the handler. If no handler is available but a finalizer is available we save the exception value + metadata (for later use by ContinuePendingUnwind), clear the VM's exception, pop the unwind context and jump to the finalizer. ContinuePendingUnwind checks whether a saved exception is available. If no saved exception is available it jumps to the resume label. Otherwise it stores the exception into the VM. The Jump after LeaveUnwindContext could be integrated into the LeaveUnwindContext instruction. I've kept them separate for now to make the bytecode more readable. > try { 1; throw "x" } catch (e) { 2 } finally { 3 }; 4 1: [ 0] EnterScope [ 10] EnterUnwindContext handler:@4 finalizer:@3 [ 38] EnterScope [ 48] LoadImmediate 1 [ 60] NewString 1 ("x") [ 70] Throw <for non-terminated blocks: insert LeaveUnwindContext + Jump @3 here> 2: [ 0] LoadImmediate 4 3: [ 0] EnterScope [ 10] LoadImmediate 3 [ 28] ContinuePendingUnwind resume:@2 4: [ 0] SetVariable 0 (e) [ 10] EnterScope [ 20] LoadImmediate 2 [ 38] LeaveUnwindContext [ 3c] Jump @3 String Table: 0: e 1: x
2021-06-10 15:04:38 +02:00
if (m_handler) {
auto& handler_block = generator.make_block();
generator.switch_to_basic_block(handler_block);
LibJS: Intercept returns through finally blocks in Bytecode This is still not perfect, as we now actually crash in the `try-finally-continue` tests, while we now succeed all `try-catch-finally-*` tests. Note that we do not yet go through the finally block when exiting the unwind context through a break or continue.
2022-11-13 20:56:53 +01:00
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto caught_value = generator.allocate_register();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::Catch>(caught_value);
LibJS/JIT: Update "unwind context" stack in JIT code Until now, the unwind context stack has not been maintained by jitted code, which meant we were unable to support the `with` statement. This is a first step towards supporting that by making jitted code call out to C++ to update the unwind context stack when entering/leaving unwind contexts. We also introduce a new "Catch" bytecode instruction that moves the current exception into the accumulator. It's always emitted at the start of a "catch" block.
2023-11-11 23:19:46 +01:00
LibJS: Restore scheduled jumps in catch blocks without finalizers
2024-04-11 11:07:35 +02:00
if (!m_finalizer) {
LibJS: Intercept returns through finally blocks in Bytecode This is still not perfect, as we now actually crash in the `try-finally-continue` tests, while we now succeed all `try-catch-finally-*` tests. Note that we do not yet go through the finally block when exiting the unwind context through a break or continue.
2022-11-13 20:56:53 +01:00
generator.emit<Bytecode::Op::LeaveUnwindContext>();
LibJS: Restore scheduled jumps in catch blocks without finalizers
2024-04-11 11:07:35 +02:00
generator.emit<Bytecode::Op::RestoreScheduledJump>();
}
LibJS: Intercept returns through finally blocks in Bytecode This is still not perfect, as we now actually crash in the `try-finally-continue` tests, while we now succeed all `try-catch-finally-*` tests. Note that we do not yet go through the finally block when exiting the unwind context through a break or continue.
2022-11-13 20:56:53 +01:00
LibJS: Avoid creating empty environment for `catch` without parameter When there is no `catch` parameter to bind the error, we don't need to allocate an environment, since there's nothing to add to it. This avoids one environment allocation every time we catch like this: try { ... } catch { ... }
2023-09-25 14:11:27 +02:00
// OPTIMIZATION: We avoid creating a lexical environment if the catch clause has no parameter.
bool did_create_variable_scope_for_catch_clause = false;
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
TRY(m_handler->parameter().visit(
LibJS: Use Identifier to represent CatchClause parameter names By doing that we consistently use Identifier node for identifiers and also enable mechanism that registers identifiers in a corresponding ScopePusher for catch parameters, which is necessary for work in the upcoming changes.
2025-04-21 19:49:38 +02:00
[&](NonnullRefPtr<Identifier const> const& parameter) -> Bytecode::CodeGenerationErrorOr<void> {
LibJS: Allow using local variable for catch parameters Local variables are faster to access and if all catch parameters are locals we can skip lexical environment allocation.
2025-04-22 00:05:36 +02:00
if (parameter->is_local()) {
LibJS: Skip allocating locals for arguments that allowed to be local This allows us to get rid of instructions that move arguments to locals and allocate smaller JS::Value vector in ExecutionContext by reusing slots that were already allocated for arguments. With this change for following function: ```js function f(x, y) { return x + y; } ``` we now produce following bytecode: ``` [ 0] 0: Add dst:reg6, lhs:arg0, rhs:arg1 [ 10] Return value:reg6 ``` instead of: ``` [ 0] 0: GetArgument 0, dst:x~1 [ 10] GetArgument 1, dst:y~0 [ 20] Add dst:reg6, lhs:x~1, rhs:y~0 [ 30] Return value:reg6 ```
2025-04-25 17:10:47 +02:00
auto local = generator.local(parameter->local_index());
LibJS: Allow using local variable for catch parameters Local variables are faster to access and if all catch parameters are locals we can skip lexical environment allocation.
2025-04-22 00:05:36 +02:00
generator.emit_mov(local, caught_value);
} else {
generator.begin_variable_scope();
did_create_variable_scope_for_catch_clause = true;
auto parameter_identifier = generator.intern_identifier(parameter->string());
generator.emit<Bytecode::Op::CreateVariable>(parameter_identifier, Bytecode::Op::EnvironmentMode::Lexical, false);
generator.emit<Bytecode::Op::InitializeLexicalBinding>(parameter_identifier, caught_value);
}
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return {};
LibJS: Add support for binding patterns in catch clauses `try { ... } catch({a=foo}) {}` is valid, and now we parse and evaluate it correctly :^)
2021-07-11 15:15:38 +04:30
},
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
[&](NonnullRefPtr<BindingPattern const> const& binding_pattern) -> Bytecode::CodeGenerationErrorOr<void> {
LibJS: Allow using local variable for catch parameters Local variables are faster to access and if all catch parameters are locals we can skip lexical environment allocation.
2025-04-22 00:05:36 +02:00
MUST(binding_pattern->for_each_bound_identifier([&](auto const& identifier) {
if (!identifier.is_local())
did_create_variable_scope_for_catch_clause = true;
}));
if (did_create_variable_scope_for_catch_clause)
generator.begin_variable_scope();
MUST(binding_pattern->for_each_bound_identifier([&](auto const& identifier) {
if (identifier.is_local())
return;
auto parameter_identifier = generator.intern_identifier(identifier.string());
generator.emit<Bytecode::Op::CreateVariable>(parameter_identifier, Bytecode::Op::EnvironmentMode::Lexical, false);
}));
LibJS: Delete create_variable param in BindingPattern::generate_bytecode It's no longer used, because we assume that caller of this function has already taken care of variable creation and initialization.
2025-04-22 00:33:54 +02:00
TRY(binding_pattern->generate_bytecode(generator, Bytecode::Op::BindingInitializationMode::Initialize, caught_value));
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return {};
LibJS: Use Identifier to represent CatchClause parameter names By doing that we consistently use Identifier node for identifiers and also enable mechanism that registers identifiers in a corresponding ScopePusher for catch parameters, which is necessary for work in the upcoming changes.
2025-04-21 19:49:38 +02:00
},
[](Empty) -> Bytecode::CodeGenerationErrorOr<void> {
return {};
LibJS: Make ASTNode::generate_bytecode() fallible Instead of crashing on the spot, return a descriptive error that will eventually continue its days as a javascript "InternalError" exception. This should make random crashes with BC less likely.
2022-02-12 19:54:08 +03:30
}));
LibJS: Add support for binding patterns in catch clauses `try { ... } catch({a=foo}) {}` is valid, and now we parse and evaluate it correctly :^)
2021-07-11 15:15:38 +04:30
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto handler_result = TRY(m_handler->body().generate_bytecode(generator));
LibJS/Bytecode: Don't bother propagating completion values in functions The last completion value in a function is not exposed to the language, since functions always either return something, or undefined. Given this, we can avoid emitting code that propagates the completion value from various statements, as long as we know we're generating code for a context where the completion value is not accessible. In practical terms, this means that function code gets to do less completion shuffling, while global and eval code has to keep doing it.
2024-05-14 10:57:06 +02:00
if (generator.must_propagate_completion()) {
if (handler_result.has_value() && !generator.is_current_block_terminated()) {
completion = generator.allocate_register();
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(*completion, *handler_result);
LibJS/Bytecode: Don't bother propagating completion values in functions The last completion value in a function is not exposed to the language, since functions always either return something, or undefined. Given this, we can avoid emitting code that propagates the completion value from various statements, as long as we know we're generating code for a context where the completion value is not accessible. In practical terms, this means that function code gets to do less completion shuffling, while global and eval code has to keep doing it.
2024-05-14 10:57:06 +02:00
}
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
}
LibJS: Implement bytecode generation for try..catch..finally EnterUnwindContext pushes an unwind context (exception handler and/or finalizer) onto a stack. LeaveUnwindContext pops the unwind context from that stack. Upon return to the interpreter loop we check whether the VM has an exception pending. If no unwind context is available we return from the loop. If an exception handler is available we clear the VM's exception, put the exception value into the accumulator register, clear the unwind context's handler and jump to the handler. If no handler is available but a finalizer is available we save the exception value + metadata (for later use by ContinuePendingUnwind), clear the VM's exception, pop the unwind context and jump to the finalizer. ContinuePendingUnwind checks whether a saved exception is available. If no saved exception is available it jumps to the resume label. Otherwise it stores the exception into the VM. The Jump after LeaveUnwindContext could be integrated into the LeaveUnwindContext instruction. I've kept them separate for now to make the bytecode more readable. > try { 1; throw "x" } catch (e) { 2 } finally { 3 }; 4 1: [ 0] EnterScope [ 10] EnterUnwindContext handler:@4 finalizer:@3 [ 38] EnterScope [ 48] LoadImmediate 1 [ 60] NewString 1 ("x") [ 70] Throw <for non-terminated blocks: insert LeaveUnwindContext + Jump @3 here> 2: [ 0] LoadImmediate 4 3: [ 0] EnterScope [ 10] LoadImmediate 3 [ 28] ContinuePendingUnwind resume:@2 4: [ 0] SetVariable 0 (e) [ 10] EnterScope [ 20] LoadImmediate 2 [ 38] LeaveUnwindContext [ 3c] Jump @3 String Table: 0: e 1: x
2021-06-10 15:04:38 +02:00
handler_target = Bytecode::Label { handler_block };
LibJS: Avoid creating empty environment for `catch` without parameter When there is no `catch` parameter to bind the error, we don't need to allocate an environment, since there's nothing to add to it. This avoids one environment allocation every time we catch like this: try { ... } catch { ... }
2023-09-25 14:11:27 +02:00
if (did_create_variable_scope_for_catch_clause)
generator.end_variable_scope();
LibJS/Bytecode: Setup declarative environment for catch with variable
2022-03-14 02:38:13 +00:00
LibJS: Implement bytecode generation for try..catch..finally EnterUnwindContext pushes an unwind context (exception handler and/or finalizer) onto a stack. LeaveUnwindContext pops the unwind context from that stack. Upon return to the interpreter loop we check whether the VM has an exception pending. If no unwind context is available we return from the loop. If an exception handler is available we clear the VM's exception, put the exception value into the accumulator register, clear the unwind context's handler and jump to the handler. If no handler is available but a finalizer is available we save the exception value + metadata (for later use by ContinuePendingUnwind), clear the VM's exception, pop the unwind context and jump to the finalizer. ContinuePendingUnwind checks whether a saved exception is available. If no saved exception is available it jumps to the resume label. Otherwise it stores the exception into the VM. The Jump after LeaveUnwindContext could be integrated into the LeaveUnwindContext instruction. I've kept them separate for now to make the bytecode more readable. > try { 1; throw "x" } catch (e) { 2 } finally { 3 }; 4 1: [ 0] EnterScope [ 10] EnterUnwindContext handler:@4 finalizer:@3 [ 38] EnterScope [ 48] LoadImmediate 1 [ 60] NewString 1 ("x") [ 70] Throw <for non-terminated blocks: insert LeaveUnwindContext + Jump @3 here> 2: [ 0] LoadImmediate 4 3: [ 0] EnterScope [ 10] LoadImmediate 3 [ 28] ContinuePendingUnwind resume:@2 4: [ 0] SetVariable 0 (e) [ 10] EnterScope [ 20] LoadImmediate 2 [ 38] LeaveUnwindContext [ 3c] Jump @3 String Table: 0: e 1: x
2021-06-10 15:04:38 +02:00
if (!generator.is_current_block_terminated()) {
if (m_finalizer) {
LibJS: Remove almost all uses of Op::Jump::set_targets() We should initialize jump targets when constructing the jump instruction instead of doing it later. This was already the case in all construction sites but one. This first patch converts all those sites to pass final targets to the constructor directly.
2023-09-28 12:43:11 +02:00
generator.emit<Bytecode::Op::Jump>(*finalizer_target);
LibJS: Implement bytecode generation for try..catch..finally EnterUnwindContext pushes an unwind context (exception handler and/or finalizer) onto a stack. LeaveUnwindContext pops the unwind context from that stack. Upon return to the interpreter loop we check whether the VM has an exception pending. If no unwind context is available we return from the loop. If an exception handler is available we clear the VM's exception, put the exception value into the accumulator register, clear the unwind context's handler and jump to the handler. If no handler is available but a finalizer is available we save the exception value + metadata (for later use by ContinuePendingUnwind), clear the VM's exception, pop the unwind context and jump to the finalizer. ContinuePendingUnwind checks whether a saved exception is available. If no saved exception is available it jumps to the resume label. Otherwise it stores the exception into the VM. The Jump after LeaveUnwindContext could be integrated into the LeaveUnwindContext instruction. I've kept them separate for now to make the bytecode more readable. > try { 1; throw "x" } catch (e) { 2 } finally { 3 }; 4 1: [ 0] EnterScope [ 10] EnterUnwindContext handler:@4 finalizer:@3 [ 38] EnterScope [ 48] LoadImmediate 1 [ 60] NewString 1 ("x") [ 70] Throw <for non-terminated blocks: insert LeaveUnwindContext + Jump @3 here> 2: [ 0] LoadImmediate 4 3: [ 0] EnterScope [ 10] LoadImmediate 3 [ 28] ContinuePendingUnwind resume:@2 4: [ 0] SetVariable 0 (e) [ 10] EnterScope [ 20] LoadImmediate 2 [ 38] LeaveUnwindContext [ 3c] Jump @3 String Table: 0: e 1: x
2021-06-10 15:04:38 +02:00
} else {
VERIFY(!next_block);
LibJS: Create static unwind mappings for `BasicBlock`s This is currently only used in the bytecode dump to annotate to where unwinds lead per block, but will be hooked up to the virtual machine in the next commit.
2023-10-19 23:18:54 +02:00
VERIFY(!unwind_context.has_value());
LibJS: Implement bytecode generation for try..catch..finally EnterUnwindContext pushes an unwind context (exception handler and/or finalizer) onto a stack. LeaveUnwindContext pops the unwind context from that stack. Upon return to the interpreter loop we check whether the VM has an exception pending. If no unwind context is available we return from the loop. If an exception handler is available we clear the VM's exception, put the exception value into the accumulator register, clear the unwind context's handler and jump to the handler. If no handler is available but a finalizer is available we save the exception value + metadata (for later use by ContinuePendingUnwind), clear the VM's exception, pop the unwind context and jump to the finalizer. ContinuePendingUnwind checks whether a saved exception is available. If no saved exception is available it jumps to the resume label. Otherwise it stores the exception into the VM. The Jump after LeaveUnwindContext could be integrated into the LeaveUnwindContext instruction. I've kept them separate for now to make the bytecode more readable. > try { 1; throw "x" } catch (e) { 2 } finally { 3 }; 4 1: [ 0] EnterScope [ 10] EnterUnwindContext handler:@4 finalizer:@3 [ 38] EnterScope [ 48] LoadImmediate 1 [ 60] NewString 1 ("x") [ 70] Throw <for non-terminated blocks: insert LeaveUnwindContext + Jump @3 here> 2: [ 0] LoadImmediate 4 3: [ 0] EnterScope [ 10] LoadImmediate 3 [ 28] ContinuePendingUnwind resume:@2 4: [ 0] SetVariable 0 (e) [ 10] EnterScope [ 20] LoadImmediate 2 [ 38] LeaveUnwindContext [ 3c] Jump @3 String Table: 0: e 1: x
2021-06-10 15:04:38 +02:00
next_block = &generator.make_block();
auto next_target = Bytecode::Label { *next_block };
generator.emit<Bytecode::Op::Jump>(next_target);
}
}
}
LibJS: Intercept returns through finally blocks in Bytecode This is still not perfect, as we now actually crash in the `try-finally-continue` tests, while we now succeed all `try-catch-finally-*` tests. Note that we do not yet go through the finally block when exiting the unwind context through a break or continue.
2022-11-13 20:56:53 +01:00
if (m_finalizer)
generator.end_boundary(Bytecode::Generator::BlockBoundaryType::ReturnToFinally);
LibJS: Create static unwind mappings for `BasicBlock`s This is currently only used in the bytecode dump to annotate to where unwinds lead per block, but will be hooked up to the virtual machine in the next commit.
2023-10-19 23:18:54 +02:00
if (m_handler) {
LibJS: Propagate finalizers into nested try-catch blocks without them
2024-04-11 00:25:54 +02:00
if (!m_finalizer) {
auto const* parent_unwind_context = generator.current_unwind_context();
if (parent_unwind_context)
unwind_context.emplace(generator, parent_unwind_context->finalizer());
else
unwind_context.emplace(generator, OptionalNone());
}
LibJS: Create static unwind mappings for `BasicBlock`s This is currently only used in the bytecode dump to annotate to where unwinds lead per block, but will be hooked up to the virtual machine in the next commit.
2023-10-19 23:18:54 +02:00
unwind_context->set_handler(handler_target.value());
}
LibJS: Implement bytecode generation for try..catch..finally EnterUnwindContext pushes an unwind context (exception handler and/or finalizer) onto a stack. LeaveUnwindContext pops the unwind context from that stack. Upon return to the interpreter loop we check whether the VM has an exception pending. If no unwind context is available we return from the loop. If an exception handler is available we clear the VM's exception, put the exception value into the accumulator register, clear the unwind context's handler and jump to the handler. If no handler is available but a finalizer is available we save the exception value + metadata (for later use by ContinuePendingUnwind), clear the VM's exception, pop the unwind context and jump to the finalizer. ContinuePendingUnwind checks whether a saved exception is available. If no saved exception is available it jumps to the resume label. Otherwise it stores the exception into the VM. The Jump after LeaveUnwindContext could be integrated into the LeaveUnwindContext instruction. I've kept them separate for now to make the bytecode more readable. > try { 1; throw "x" } catch (e) { 2 } finally { 3 }; 4 1: [ 0] EnterScope [ 10] EnterUnwindContext handler:@4 finalizer:@3 [ 38] EnterScope [ 48] LoadImmediate 1 [ 60] NewString 1 ("x") [ 70] Throw <for non-terminated blocks: insert LeaveUnwindContext + Jump @3 here> 2: [ 0] LoadImmediate 4 3: [ 0] EnterScope [ 10] LoadImmediate 3 [ 28] ContinuePendingUnwind resume:@2 4: [ 0] SetVariable 0 (e) [ 10] EnterScope [ 20] LoadImmediate 2 [ 38] LeaveUnwindContext [ 3c] Jump @3 String Table: 0: e 1: x
2021-06-10 15:04:38 +02:00
LibJS: Make EnterUnwindContext a terminator op Otherwise a basic block could have multiple outgoing edges without having much reason to do so.
2021-06-13 20:39:40 +04:30
auto& target_block = generator.make_block();
LibJS: Implement bytecode generation for try..catch..finally EnterUnwindContext pushes an unwind context (exception handler and/or finalizer) onto a stack. LeaveUnwindContext pops the unwind context from that stack. Upon return to the interpreter loop we check whether the VM has an exception pending. If no unwind context is available we return from the loop. If an exception handler is available we clear the VM's exception, put the exception value into the accumulator register, clear the unwind context's handler and jump to the handler. If no handler is available but a finalizer is available we save the exception value + metadata (for later use by ContinuePendingUnwind), clear the VM's exception, pop the unwind context and jump to the finalizer. ContinuePendingUnwind checks whether a saved exception is available. If no saved exception is available it jumps to the resume label. Otherwise it stores the exception into the VM. The Jump after LeaveUnwindContext could be integrated into the LeaveUnwindContext instruction. I've kept them separate for now to make the bytecode more readable. > try { 1; throw "x" } catch (e) { 2 } finally { 3 }; 4 1: [ 0] EnterScope [ 10] EnterUnwindContext handler:@4 finalizer:@3 [ 38] EnterScope [ 48] LoadImmediate 1 [ 60] NewString 1 ("x") [ 70] Throw <for non-terminated blocks: insert LeaveUnwindContext + Jump @3 here> 2: [ 0] LoadImmediate 4 3: [ 0] EnterScope [ 10] LoadImmediate 3 [ 28] ContinuePendingUnwind resume:@2 4: [ 0] SetVariable 0 (e) [ 10] EnterScope [ 20] LoadImmediate 2 [ 38] LeaveUnwindContext [ 3c] Jump @3 String Table: 0: e 1: x
2021-06-10 15:04:38 +02:00
generator.switch_to_basic_block(saved_block);
Revert "LibJS/Bytecode: Bring back the bytecode optimization pipeline" This reverts commit 5b29974bfa9b14224c5a1dc4feb41e22eda1e0f2.
2024-03-06 08:36:19 +01:00
generator.emit<Bytecode::Op::EnterUnwindContext>(Bytecode::Label { target_block });
LibJS: Leave the unwind context on break/continue/return in bytecode Otherwise we'd keep the old unwind context, and end up never invoking the other handlers up the stack.
2022-03-13 11:51:02 +03:30
generator.start_boundary(Bytecode::Generator::BlockBoundaryType::Unwind);
LibJS: Intercept returns through finally blocks in Bytecode This is still not perfect, as we now actually crash in the `try-finally-continue` tests, while we now succeed all `try-catch-finally-*` tests. Note that we do not yet go through the finally block when exiting the unwind context through a break or continue.
2022-11-13 20:56:53 +01:00
if (m_finalizer)
generator.start_boundary(Bytecode::Generator::BlockBoundaryType::ReturnToFinally);
LibJS: Make EnterUnwindContext a terminator op Otherwise a basic block could have multiple outgoing edges without having much reason to do so.
2021-06-13 20:39:40 +04:30
generator.switch_to_basic_block(target_block);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto block_result = TRY(m_block->generate_bytecode(generator));
LibJS: Fix codegen for nodes after try statements without 'finally' Previously we were just dropping them on the ground :P
2021-11-10 22:22:26 +03:30
if (!generator.is_current_block_terminated()) {
LibJS/Bytecode: Don't bother propagating completion values in functions The last completion value in a function is not exposed to the language, since functions always either return something, or undefined. Given this, we can avoid emitting code that propagates the completion value from various statements, as long as we know we're generating code for a context where the completion value is not accessible. In practical terms, this means that function code gets to do less completion shuffling, while global and eval code has to keep doing it.
2024-05-14 10:57:06 +02:00
if (generator.must_propagate_completion()) {
if (block_result.has_value()) {
completion = generator.allocate_register();
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(*completion, *block_result);
LibJS/Bytecode: Don't bother propagating completion values in functions The last completion value in a function is not exposed to the language, since functions always either return something, or undefined. Given this, we can avoid emitting code that propagates the completion value from various statements, as long as we know we're generating code for a context where the completion value is not accessible. In practical terms, this means that function code gets to do less completion shuffling, while global and eval code has to keep doing it.
2024-05-14 10:57:06 +02:00
}
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
}
LibJS: Fix codegen for nodes after try statements without 'finally' Previously we were just dropping them on the ground :P
2021-11-10 22:22:26 +03:30
if (m_finalizer) {
LibJS: Remove almost all uses of Op::Jump::set_targets() We should initialize jump targets when constructing the jump instruction instead of doing it later. This was already the case in all construction sites but one. This first patch converts all those sites to pass final targets to the constructor directly.
2023-09-28 12:43:11 +02:00
generator.emit<Bytecode::Op::Jump>(*finalizer_target);
LibJS: Fix codegen for nodes after try statements without 'finally' Previously we were just dropping them on the ground :P
2021-11-10 22:22:26 +03:30
} else {
LibJS: Create static unwind mappings for `BasicBlock`s This is currently only used in the bytecode dump to annotate to where unwinds lead per block, but will be hooked up to the virtual machine in the next commit.
2023-10-19 23:18:54 +02:00
VERIFY(unwind_context.has_value());
unwind_context.clear();
LibJS/Bytecode: Fix bogus program termination after `try` with `catch` For `try` statements with a `catch` clause, we were generating *two* "next" blocks. This meant that not throwing an exception would cause execution to stop. Fix this by using the "next" block pointer for the try "entry" and "handler" blocks.
2023-05-13 18:50:27 +02:00
if (!next_block)
next_block = &generator.make_block();
LibJS: Remove FinishUnwind instruction This is essentially a LeaveUnwind+Jump, so lets just do that, that will make it easier to optimize it, or see unwind state transitions
2022-11-13 18:38:15 +01:00
generator.emit<Bytecode::Op::LeaveUnwindContext>();
LibJS/Bytecode: Fix bogus program termination after `try` with `catch` For `try` statements with a `catch` clause, we were generating *two* "next" blocks. This meant that not throwing an exception would cause execution to stop. Fix this by using the "next" block pointer for the try "entry" and "handler" blocks.
2023-05-13 18:50:27 +02:00
generator.emit<Bytecode::Op::Jump>(Bytecode::Label { *next_block });
LibJS: Fix codegen for nodes after try statements without 'finally' Previously we were just dropping them on the ground :P
2021-11-10 22:22:26 +03:30
}
}
LibJS: Intercept returns through finally blocks in Bytecode This is still not perfect, as we now actually crash in the `try-finally-continue` tests, while we now succeed all `try-catch-finally-*` tests. Note that we do not yet go through the finally block when exiting the unwind context through a break or continue.
2022-11-13 20:56:53 +01:00
if (m_finalizer)
generator.end_boundary(Bytecode::Generator::BlockBoundaryType::ReturnToFinally);
LibJS: Leave the unwind context on break/continue/return in bytecode Otherwise we'd keep the old unwind context, and end up never invoking the other handlers up the stack.
2022-03-13 11:51:02 +03:30
generator.end_boundary(Bytecode::Generator::BlockBoundaryType::Unwind);
LibJS: Implement bytecode generation for try..catch..finally EnterUnwindContext pushes an unwind context (exception handler and/or finalizer) onto a stack. LeaveUnwindContext pops the unwind context from that stack. Upon return to the interpreter loop we check whether the VM has an exception pending. If no unwind context is available we return from the loop. If an exception handler is available we clear the VM's exception, put the exception value into the accumulator register, clear the unwind context's handler and jump to the handler. If no handler is available but a finalizer is available we save the exception value + metadata (for later use by ContinuePendingUnwind), clear the VM's exception, pop the unwind context and jump to the finalizer. ContinuePendingUnwind checks whether a saved exception is available. If no saved exception is available it jumps to the resume label. Otherwise it stores the exception into the VM. The Jump after LeaveUnwindContext could be integrated into the LeaveUnwindContext instruction. I've kept them separate for now to make the bytecode more readable. > try { 1; throw "x" } catch (e) { 2 } finally { 3 }; 4 1: [ 0] EnterScope [ 10] EnterUnwindContext handler:@4 finalizer:@3 [ 38] EnterScope [ 48] LoadImmediate 1 [ 60] NewString 1 ("x") [ 70] Throw <for non-terminated blocks: insert LeaveUnwindContext + Jump @3 here> 2: [ 0] LoadImmediate 4 3: [ 0] EnterScope [ 10] LoadImmediate 3 [ 28] ContinuePendingUnwind resume:@2 4: [ 0] SetVariable 0 (e) [ 10] EnterScope [ 20] LoadImmediate 2 [ 38] LeaveUnwindContext [ 3c] Jump @3 String Table: 0: e 1: x
2021-06-10 15:04:38 +02:00
generator.switch_to_basic_block(next_block ? *next_block : saved_block);
LibJS/Bytecode: Don't bother propagating completion values in functions The last completion value in a function is not exposed to the language, since functions always either return something, or undefined. Given this, we can avoid emitting code that propagates the completion value from various statements, as long as we know we're generating code for a context where the completion value is not accessible. In practical terms, this means that function code gets to do less completion shuffling, while global and eval code has to keep doing it.
2024-05-14 10:57:06 +02:00
if (generator.must_propagate_completion()) {
if (!completion.has_value())
return generator.add_constant(js_undefined());
}
return completion;
LibJS: Implement bytecode generation for try..catch..finally EnterUnwindContext pushes an unwind context (exception handler and/or finalizer) onto a stack. LeaveUnwindContext pops the unwind context from that stack. Upon return to the interpreter loop we check whether the VM has an exception pending. If no unwind context is available we return from the loop. If an exception handler is available we clear the VM's exception, put the exception value into the accumulator register, clear the unwind context's handler and jump to the handler. If no handler is available but a finalizer is available we save the exception value + metadata (for later use by ContinuePendingUnwind), clear the VM's exception, pop the unwind context and jump to the finalizer. ContinuePendingUnwind checks whether a saved exception is available. If no saved exception is available it jumps to the resume label. Otherwise it stores the exception into the VM. The Jump after LeaveUnwindContext could be integrated into the LeaveUnwindContext instruction. I've kept them separate for now to make the bytecode more readable. > try { 1; throw "x" } catch (e) { 2 } finally { 3 }; 4 1: [ 0] EnterScope [ 10] EnterUnwindContext handler:@4 finalizer:@3 [ 38] EnterScope [ 48] LoadImmediate 1 [ 60] NewString 1 ("x") [ 70] Throw <for non-terminated blocks: insert LeaveUnwindContext + Jump @3 here> 2: [ 0] LoadImmediate 4 3: [ 0] EnterScope [ 10] LoadImmediate 3 [ 28] ContinuePendingUnwind resume:@2 4: [ 0] SetVariable 0 (e) [ 10] EnterScope [ 20] LoadImmediate 2 [ 38] LeaveUnwindContext [ 3c] Jump @3 String Table: 0: e 1: x
2021-06-10 15:04:38 +02:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> SwitchStatement::generate_bytecode(Bytecode::Generator& generator, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS/Bytecode: Implement break/continue labels This is done by keeping track of all the labels that apply to a given break/continue scope alongside their bytecode target. When a break/continue with a label is generated, we scan from the most inner scope to the most outer scope looking for the label, performing any necessary unwinds on the way. Once the label is found, it is then jumped to.
2022-06-11 23:09:37 +01:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS/Bytecode: Implement break/continue labels This is done by keeping track of all the labels that apply to a given break/continue scope alongside their bytecode target. When a break/continue with a label is generated, we scan from the most inner scope to the most outer scope looking for the label, performing any necessary unwinds on the way. Once the label is found, it is then jumped to.
2022-06-11 23:09:37 +01:00
return generate_labelled_evaluation(generator, {});
}
LibJS: Use FlyString in PropertyKey instead of DeprecatedFlyString This required dealing with *substantial* fallout.
2025-03-18 18:08:02 -05:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> SwitchStatement::generate_labelled_evaluation(Bytecode::Generator& generator, Vector<FlyString> const& label_set, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS: Implement bytecode generation for switch
2021-06-11 00:36:16 +02:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
LibJS/Bytecode: Don't bother propagating completion values in functions The last completion value in a function is not exposed to the language, since functions always either return something, or undefined. Given this, we can avoid emitting code that propagates the completion value from various statements, as long as we know we're generating code for a context where the completion value is not accessible. In practical terms, this means that function code gets to do less completion shuffling, while global and eval code has to keep doing it.
2024-05-14 10:57:06 +02:00
Optional<ScopedOperand> completion;
if (generator.must_propagate_completion()) {
completion = generator.allocate_register();
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(*completion, generator.add_constant(js_undefined()));
LibJS/Bytecode: Don't bother propagating completion values in functions The last completion value in a function is not exposed to the language, since functions always either return something, or undefined. Given this, we can avoid emitting code that propagates the completion value from various statements, as long as we know we're generating code for a context where the completion value is not accessible. In practical terms, this means that function code gets to do less completion shuffling, while global and eval code has to keep doing it.
2024-05-14 10:57:06 +02:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto discriminant = TRY(m_discriminant->generate_bytecode(generator)).value();
LibJS: Implement bytecode generation for switch
2021-06-11 00:36:16 +02:00
Vector<Bytecode::BasicBlock&> case_blocks;
LibJS/Bytecode: Keep completion value of switch case if falling through We do this by moving the `LoadImmediate undefined` instruction to a separate basic block which jumps to the case's block unconditionally. We enter a case initially using this wrapper, but when falling through, we directly jump to the next case's block.
2023-06-28 11:45:19 +02:00
Bytecode::BasicBlock* entry_block_for_default { nullptr };
LibJS: Implement bytecode generation for switch
2021-06-11 00:36:16 +02:00
Bytecode::BasicBlock* next_test_block = &generator.make_block();
LibJS: Actually generate a lexical env for SwitchStatement in BC We had code for this in ScopeNode, but that function was never called for a SwitchStatement. This fixes a bunch of scoping tests for switch.
2022-04-03 02:13:51 +04:30
LibJS/Bytecode: Don't create empty lexical environments This patch stops emitting the BlockDeclarationInstantiation instruction when there are no locals, and no function declarations in the scope. We were spending 20% of CPU time on https://ventrella.com/Clusters/ just creating empty environments for no reason.
2024-05-11 13:25:08 +02:00
bool did_create_lexical_environment = false;
if (has_lexical_declarations())
did_create_lexical_environment = generator.emit_block_declaration_instantiation(*this);
LibJS: Actually generate a lexical env for SwitchStatement in BC We had code for this in ScopeNode, but that function was never called for a SwitchStatement. This fixes a bunch of scoping tests for switch.
2022-04-03 02:13:51 +04:30
LibJS: Remove almost all uses of Op::Jump::set_targets() We should initialize jump targets when constructing the jump instruction instead of doing it later. This was already the case in all construction sites but one. This first patch converts all those sites to pass final targets to the constructor directly.
2023-09-28 12:43:11 +02:00
generator.emit<Bytecode::Op::Jump>(Bytecode::Label { *next_test_block });
LibJS: Actually generate a lexical env for SwitchStatement in BC We had code for this in ScopeNode, but that function was never called for a SwitchStatement. This fixes a bunch of scoping tests for switch.
2022-04-03 02:13:51 +04:30
LibJS/Bytecode: Bunch all tests together in switch statement codegen Before this change, switch codegen would interleave bytecode like this: (test for case 1) (code for case 1) (test for case 2) (code for case 2) This meant that we often had to make many large jumps while looking for the matching case, since code for each case can be huge. It now looks like this instead: (test for case 1) (test for case 2) (code for case 1) (code for case 2) This way, we can just fall through the tests until we hit one that fits, without having to make any large jumps.
2024-05-08 13:08:38 +02:00
Queue<Bytecode::BasicBlock*> test_blocks;
for (auto& switch_case : m_cases) {
if (switch_case->test())
test_blocks.enqueue(&generator.make_block());
}
LibJS: Implement bytecode generation for switch
2021-06-11 00:36:16 +02:00
for (auto& switch_case : m_cases) {
auto& case_block = generator.make_block();
Everywhere: Stop using NonnullRefPtrVector This class had slightly confusing semantics and the added weirdness doesn't seem worth it just so we can say "." instead of "->" when iterating over a vector of NNRPs. This patch replaces NonnullRefPtrVector<T> with Vector<NNRP<T>>.
2023-03-06 14:17:01 +01:00
if (switch_case->test()) {
LibJS: Implement bytecode generation for switch
2021-06-11 00:36:16 +02:00
generator.switch_to_basic_block(*next_test_block);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto test_value = TRY(switch_case->test()->generate_bytecode(generator)).value();
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto result = generator.allocate_register();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::StrictlyEquals>(result, test_value, discriminant);
LibJS/Bytecode: Bunch all tests together in switch statement codegen Before this change, switch codegen would interleave bytecode like this: (test for case 1) (code for case 1) (test for case 2) (code for case 2) This meant that we often had to make many large jumps while looking for the matching case, since code for each case can be huge. It now looks like this instead: (test for case 1) (test for case 2) (code for case 1) (code for case 2) This way, we can just fall through the tests until we hit one that fits, without having to make any large jumps.
2024-05-08 13:08:38 +02:00
next_test_block = test_blocks.dequeue();
LibJS/Bytecode: Do basic compare-and-jump peephole optimization We now fuse sequences like [LessThan, JumpIf] to JumpLessThan. This is only allowed for temporaries (i.e VM registers) with no other references to them.
2024-05-09 15:13:31 +02:00
generator.emit_jump_if(
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
result,
LibJS/Bytecode: Remove pointless basic block in SwitchStatement codegen
2024-05-08 12:55:32 +02:00
Bytecode::Label { case_block },
LibJS: Remove almost all uses of Op::Jump::set_targets() We should initialize jump targets when constructing the jump instruction instead of doing it later. This was already the case in all construction sites but one. This first patch converts all those sites to pass final targets to the constructor directly.
2023-09-28 12:43:11 +02:00
Bytecode::Label { *next_test_block });
LibJS: Implement bytecode generation for switch
2021-06-11 00:36:16 +02:00
} else {
LibJS/Bytecode: Remove pointless basic block in SwitchStatement codegen
2024-05-08 12:55:32 +02:00
entry_block_for_default = &case_block;
LibJS: Implement bytecode generation for switch
2021-06-11 00:36:16 +02:00
}
LibJS/Bytecode: Keep completion value of switch case if falling through We do this by moving the `LoadImmediate undefined` instruction to a separate basic block which jumps to the case's block unconditionally. We enter a case initially using this wrapper, but when falling through, we directly jump to the next case's block.
2023-06-28 11:45:19 +02:00
LibJS: Implement bytecode generation for switch
2021-06-11 00:36:16 +02:00
case_blocks.append(case_block);
}
generator.switch_to_basic_block(*next_test_block);
auto& end_block = generator.make_block();
LibJS/Bytecode: Keep completion value of switch case if falling through We do this by moving the `LoadImmediate undefined` instruction to a separate basic block which jumps to the case's block unconditionally. We enter a case initially using this wrapper, but when falling through, we directly jump to the next case's block.
2023-06-28 11:45:19 +02:00
if (entry_block_for_default != nullptr) {
LibJS: Remove almost all uses of Op::Jump::set_targets() We should initialize jump targets when constructing the jump instruction instead of doing it later. This was already the case in all construction sites but one. This first patch converts all those sites to pass final targets to the constructor directly.
2023-09-28 12:43:11 +02:00
generator.emit<Bytecode::Op::Jump>(Bytecode::Label { *entry_block_for_default });
LibJS: Implement bytecode generation for switch
2021-06-11 00:36:16 +02:00
} else {
LibJS: Remove almost all uses of Op::Jump::set_targets() We should initialize jump targets when constructing the jump instruction instead of doing it later. This was already the case in all construction sites but one. This first patch converts all those sites to pass final targets to the constructor directly.
2023-09-28 12:43:11 +02:00
generator.emit<Bytecode::Op::Jump>(Bytecode::Label { end_block });
LibJS: Implement bytecode generation for switch
2021-06-11 00:36:16 +02:00
}
auto current_block = case_blocks.begin();
LibJS/Bytecode: Implement break/continue labels This is done by keeping track of all the labels that apply to a given break/continue scope alongside their bytecode target. When a break/continue with a label is generated, we scan from the most inner scope to the most outer scope looking for the label, performing any necessary unwinds on the way. Once the label is found, it is then jumped to.
2022-06-11 23:09:37 +01:00
generator.begin_breakable_scope(Bytecode::Label { end_block }, label_set);
LibJS: Implement bytecode generation for switch
2021-06-11 00:36:16 +02:00
for (auto& switch_case : m_cases) {
generator.switch_to_basic_block(*current_block);
Everywhere: Stop using NonnullRefPtrVector This class had slightly confusing semantics and the added weirdness doesn't seem worth it just so we can say "." instead of "->" when iterating over a vector of NNRPs. This patch replaces NonnullRefPtrVector<T> with Vector<NNRP<T>>.
2023-03-06 14:17:01 +01:00
for (auto& statement : switch_case->children()) {
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto result = TRY(statement->generate_bytecode(generator));
LibJS: Stop generating switch case statements on block termination After we terminate a block (e.g. break, continue), we cannot generate anymore bytecode for the block. This caused us to crash with this example code: ``` a = 0; switch (a) { case 0: break; console.log("hello world"); } ``` Anything after a block terminating instruction is considered unreachable code, so we can safely skip any statements after it.
2022-03-15 01:43:44 +00:00
if (generator.is_current_block_terminated())
break;
LibJS/Bytecode: Don't bother propagating completion values in functions The last completion value in a function is not exposed to the language, since functions always either return something, or undefined. Given this, we can avoid emitting code that propagates the completion value from various statements, as long as we know we're generating code for a context where the completion value is not accessible. In practical terms, this means that function code gets to do less completion shuffling, while global and eval code has to keep doing it.
2024-05-14 10:57:06 +02:00
if (generator.must_propagate_completion()) {
if (result.has_value())
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(*completion, *result);
LibJS/Bytecode: Don't bother propagating completion values in functions The last completion value in a function is not exposed to the language, since functions always either return something, or undefined. Given this, we can avoid emitting code that propagates the completion value from various statements, as long as we know we're generating code for a context where the completion value is not accessible. In practical terms, this means that function code gets to do less completion shuffling, while global and eval code has to keep doing it.
2024-05-14 10:57:06 +02:00
else
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(*completion, generator.add_constant(js_undefined()));
LibJS/Bytecode: Don't bother propagating completion values in functions The last completion value in a function is not exposed to the language, since functions always either return something, or undefined. Given this, we can avoid emitting code that propagates the completion value from various statements, as long as we know we're generating code for a context where the completion value is not accessible. In practical terms, this means that function code gets to do less completion shuffling, while global and eval code has to keep doing it.
2024-05-14 10:57:06 +02:00
}
LibJS: Implement bytecode generation for switch
2021-06-11 00:36:16 +02:00
}
if (!generator.is_current_block_terminated()) {
auto next_block = current_block;
next_block++;
if (next_block.is_end()) {
LibJS: Remove almost all uses of Op::Jump::set_targets() We should initialize jump targets when constructing the jump instruction instead of doing it later. This was already the case in all construction sites but one. This first patch converts all those sites to pass final targets to the constructor directly.
2023-09-28 12:43:11 +02:00
generator.emit<Bytecode::Op::Jump>(Bytecode::Label { end_block });
LibJS: Implement bytecode generation for switch
2021-06-11 00:36:16 +02:00
} else {
LibJS: Remove almost all uses of Op::Jump::set_targets() We should initialize jump targets when constructing the jump instruction instead of doing it later. This was already the case in all construction sites but one. This first patch converts all those sites to pass final targets to the constructor directly.
2023-09-28 12:43:11 +02:00
generator.emit<Bytecode::Op::Jump>(Bytecode::Label { *next_block });
LibJS: Implement bytecode generation for switch
2021-06-11 00:36:16 +02:00
}
}
current_block++;
}
generator.end_breakable_scope();
generator.switch_to_basic_block(end_block);
LibJS/Bytecode: Actually exit `switch` statement's lexical scope 95 new passes on test262. :^)
2023-06-25 07:37:24 +02:00
LibJS/Bytecode: Don't create empty lexical environments This patch stops emitting the BlockDeclarationInstantiation instruction when there are no locals, and no function declarations in the scope. We were spending 20% of CPU time on https://ventrella.com/Clusters/ just creating empty environments for no reason.
2024-05-11 13:25:08 +02:00
if (did_create_lexical_environment)
LibJS/Bytecode: Actually exit `switch` statement's lexical scope 95 new passes on test262. :^)
2023-06-25 07:37:24 +02:00
generator.end_variable_scope();
LibJS/Bytecode: Don't bother propagating completion values in functions The last completion value in a function is not exposed to the language, since functions always either return something, or undefined. Given this, we can avoid emitting code that propagates the completion value from various statements, as long as we know we're generating code for a context where the completion value is not accessible. In practical terms, this means that function code gets to do less completion shuffling, while global and eval code has to keep doing it.
2024-05-14 10:57:06 +02:00
return completion;
LibJS: Implement bytecode generation for switch
2021-06-11 00:36:16 +02:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> SuperExpression::generate_bytecode(Bytecode::Generator&, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS/Bytecode: Ensure we do not generate bytecode for super expressions Similar to AST mode, super expressions are handled elsewhere.
2023-07-06 17:16:20 -04:00
{
// The semantics for SuperExpression are handled in CallExpression and SuperCall.
VERIFY_NOT_REACHED();
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> ClassDeclaration::generate_bytecode(Bytecode::Generator& generator, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS: NewClass bytecode instruction This adds a the NewClass bytecode instruction, enough of it is implemented for it to show it in the bytecode (js -d).
2021-06-30 15:42:13 -03:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto value = TRY(m_class_expression->generate_bytecode(generator)).value();
LibJS/Bytecode: Split SetVariable into four separate instructions Instead of SetVariable having 2x2 modes for variable/lexical and initialize/set, those 4 modes are now separate instructions, which makes each instruction much less branchy.
2024-05-14 11:30:30 +02:00
generator.emit_set_variable(*m_class_expression.ptr()->m_name, value, Bytecode::Op::BindingInitializationMode::Initialize);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
// NOTE: ClassDeclaration does not produce a value.
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
return Optional<ScopedOperand> {};
LibJS: Implement ClassExpression::generate_bytecode() ...and use that in ClassDeclaration::generate_bytecode().
2022-02-12 19:55:40 +03:30
}
LibJS: Stop using execute_ast_node in NewClass instruction This change replaces usage of `execute_ast_node` to evaluate super expression in NewClass by generating instructions instead.
2023-06-28 18:22:27 +03:00
// 15.7.14 Runtime Semantics: ClassDefinitionEvaluation, https://tc39.es/ecma262/#sec-runtime-semantics-classdefinitionevaluation
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> ClassExpression::generate_bytecode_with_lhs_name(Bytecode::Generator& generator, Optional<Bytecode::IdentifierTableIndex> lhs_name, Optional<ScopedOperand> preferred_dst) const
LibJS: Implement ClassExpression::generate_bytecode() ...and use that in ClassDeclaration::generate_bytecode().
2022-02-12 19:55:40 +03:30
{
LibJS: Stop using execute_ast_node in NewClass instruction This change replaces usage of `execute_ast_node` to evaluate super expression in NewClass by generating instructions instead.
2023-06-28 18:22:27 +03:00
// NOTE: Step 2 is not a part of NewClass instruction because it is assumed to be done before super class expression evaluation
generator.emit<Bytecode::Op::CreateLexicalEnvironment>();
if (has_name() || !lhs_name.has_value()) {
// NOTE: Step 3.a is not a part of NewClass instruction because it is assumed to be done before super class expression evaluation
LibJS: Use Identifier to represent name of ClassExpression By using Identifier class to represent the name of a class expression, it becomes possible to consistently store information within the identifier object, indicating whether the name refers to a local variable or not.
2023-06-30 16:51:39 +03:00
auto interned_index = generator.intern_identifier(name());
LibJS: Stop using execute_ast_node in NewClass instruction This change replaces usage of `execute_ast_node` to evaluate super expression in NewClass by generating instructions instead.
2023-06-28 18:22:27 +03:00
generator.emit<Bytecode::Op::CreateVariable>(interned_index, Bytecode::Op::EnvironmentMode::Lexical, true);
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Optional<ScopedOperand> super_class;
LibJS: Stop using execute_ast_node in NewClass instruction This change replaces usage of `execute_ast_node` to evaluate super expression in NewClass by generating instructions instead.
2023-06-28 18:22:27 +03:00
if (m_super_class)
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
super_class = TRY(m_super_class->generate_bytecode(generator)).value();
LibJS: Stop using execute_ast_node in NewClass instruction This change replaces usage of `execute_ast_node` to evaluate super expression in NewClass by generating instructions instead.
2023-06-28 18:22:27 +03:00
LibJS: Stop using execute_ast_node() for class property evaluation Instead, generate bytecode to execute their AST nodes and save the resulting operands inside the NewClass instruction. Moving property expression evaluation to happen before NewClass execution also moves along creation of new private environment and its population with private members (private members should be visible during property evaluation). Before: - NewClass After: - CreatePrivateEnvironment - AddPrivateName - ... - AddPrivateName - NewClass - LeavePrivateEnvironment
2024-05-11 22:54:41 +00:00
generator.emit<Op::CreatePrivateEnvironment>();
for (auto const& element : m_elements) {
auto opt_private_name = element->private_bound_identifier();
if (opt_private_name.has_value()) {
generator.emit<Op::AddPrivateName>(generator.intern_identifier(*opt_private_name));
}
}
Vector<Optional<ScopedOperand>> elements;
for (auto const& element : m_elements) {
Optional<ScopedOperand> key;
if (is<ClassMethod>(*element)) {
auto const& class_method = static_cast<ClassMethod const&>(*element);
if (!is<PrivateIdentifier>(class_method.key()))
key = TRY(class_method.key().generate_bytecode(generator));
} else if (is<ClassField>(*element)) {
auto const& class_field = static_cast<ClassField const&>(*element);
if (!is<PrivateIdentifier>(class_field.key()))
key = TRY(class_field.key().generate_bytecode(generator));
}
elements.append({ key });
}
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto dst = choose_dst(generator, preferred_dst);
LibJS: Stop using execute_ast_node() for class property evaluation Instead, generate bytecode to execute their AST nodes and save the resulting operands inside the NewClass instruction. Moving property expression evaluation to happen before NewClass execution also moves along creation of new private environment and its population with private members (private members should be visible during property evaluation). Before: - NewClass After: - CreatePrivateEnvironment - AddPrivateName - ... - AddPrivateName - NewClass - LeavePrivateEnvironment
2024-05-11 22:54:41 +00:00
generator.emit_with_extra_slots<Op::NewClass, Optional<Operand>>(elements.size(), dst, super_class.has_value() ? super_class->operand() : Optional<Operand> {}, *this, lhs_name, elements);
generator.emit<Op::LeavePrivateEnvironment>();
LibJS: Stop using execute_ast_node in NewClass instruction This change replaces usage of `execute_ast_node` to evaluate super expression in NewClass by generating instructions instead.
2023-06-28 18:22:27 +03:00
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return dst;
LibJS: NewClass bytecode instruction This adds a the NewClass bytecode instruction, enough of it is implemented for it to show it in the bytecode (js -d).
2021-06-30 15:42:13 -03:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> ClassExpression::generate_bytecode(Bytecode::Generator& generator, Optional<ScopedOperand> preferred_dst) const
LibJS/Bytecode: Add codegen for "named evaluation if anonymous function" This gives anonymous functions the name from the LHS they are being assigned to. 171 new passes on test262. :^)
2023-06-23 14:27:42 +02:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return generate_bytecode_with_lhs_name(generator, {}, preferred_dst);
LibJS/Bytecode: Add codegen for "named evaluation if anonymous function" This gives anonymous functions the name from the LHS they are being assigned to. 171 new passes on test262. :^)
2023-06-23 14:27:42 +02:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> SpreadExpression::generate_bytecode(Bytecode::Generator& generator, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS: Allow SpreadExpressions to generate bytecode
2022-09-02 23:39:04 +02:00
{
// NOTE: All users of this should handle the behaviour of this on their own,
// assuming it returns an Array-like object
return m_target->generate_bytecode(generator);
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> ThisExpression::generate_bytecode(Bytecode::Generator& generator, Optional<ScopedOperand> preferred_dst) const
LibJS: Implement 'this' in the bytecode VM ThisExpression now emits a "ResolveThisBinding" bytecode op, which simply loads the VM's current 'this' binding into the accumulator.
2021-10-24 14:43:00 +02:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS/Bytecode: Only emit ResolveThisBinding once per basic block Once executed, this instruction will always produce the same result in subsequent executions, so it's okay to cache it. Unfortunately it may throw, so we can't just hoist it to the top of every executable, since that would break observable execution order.
2024-05-07 12:16:37 +02:00
return generator.get_this(preferred_dst);
LibJS: Implement 'this' in the bytecode VM ThisExpression now emits a "ResolveThisBinding" bytecode op, which simply loads the VM's current 'this' binding into the accumulator.
2021-10-24 14:43:00 +02:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
static ScopedOperand generate_await(
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
Bytecode::Generator& generator,
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
ScopedOperand argument,
ScopedOperand received_completion,
ScopedOperand received_completion_type,
LibJS: Make async functions & generators faster with helper types Instead of returning internal generator results as ordinary JS::Objects with properties, we now use GeneratorResult and CompletionCell which both inherit from Cell directly and allow efficient access to state. 1.59x speedup on JetStream3/lazy-collections.js :^)
2025-03-31 09:32:39 +01:00
ScopedOperand received_completion_value)
LibJS: Implement async functions as generator functions in BC mode This applies a simple transformation, and adds a simple wrapper that translates the generator interface to the async function interface.
2021-11-11 00:46:07 +03:30
{
VERIFY(generator.is_in_async_function());
auto& continuation_block = generator.make_block();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::Await>(Bytecode::Label { continuation_block }, argument);
LibJS: Implement async functions as generator functions in BC mode This applies a simple transformation, and adds a simple wrapper that translates the generator interface to the async function interface.
2021-11-11 00:46:07 +03:30
generator.switch_to_basic_block(continuation_block);
LibJS: Align codegen AwaitExpressions to YieldExpressions We use generators in bytecode to approximate async functions, but the code generated by AwaitExpressions did not have the value processing paths that Yield requires, eg the `generator.throw()` path, which is used by AsyncFunctionDriverWrapper to signal Promise rejections.
2022-12-25 17:15:29 +01:00
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
// FIXME: It's really magical that we can just assume that the completion value is in register 0.
// It ends up there because we "return" from the Await instruction above via the synthetic
// generator function that actually drives async execution.
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(received_completion, generator.accumulator());
LibJS: Make async functions & generators faster with helper types Instead of returning internal generator results as ordinary JS::Objects with properties, we now use GeneratorResult and CompletionCell which both inherit from Cell directly and allow efficient access to state. 1.59x speedup on JetStream3/lazy-collections.js :^)
2025-03-31 09:32:39 +01:00
get_received_completion_type_and_value(generator, received_completion, received_completion_type, received_completion_value);
LibJS: Align codegen AwaitExpressions to YieldExpressions We use generators in bytecode to approximate async functions, but the code generated by AwaitExpressions did not have the value processing paths that Yield requires, eg the `generator.throw()` path, which is used by AsyncFunctionDriverWrapper to signal Promise rejections.
2022-12-25 17:15:29 +01:00
auto& normal_completion_continuation_block = generator.make_block();
auto& throw_value_block = generator.make_block();
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto received_completion_type_is_normal = generator.allocate_register();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::StrictlyEquals>(
received_completion_type_is_normal,
received_completion_type,
generator.add_constant(Value(to_underlying(Completion::Type::Normal))));
LibJS/Bytecode: Do basic compare-and-jump peephole optimization We now fuse sequences like [LessThan, JumpIf] to JumpLessThan. This is only allowed for temporaries (i.e VM registers) with no other references to them.
2024-05-09 15:13:31 +02:00
generator.emit_jump_if(
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
received_completion_type_is_normal,
LibJS: Align codegen AwaitExpressions to YieldExpressions We use generators in bytecode to approximate async functions, but the code generated by AwaitExpressions did not have the value processing paths that Yield requires, eg the `generator.throw()` path, which is used by AsyncFunctionDriverWrapper to signal Promise rejections.
2022-12-25 17:15:29 +01:00
Bytecode::Label { normal_completion_continuation_block },
Bytecode::Label { throw_value_block });
LibJS/Bytecode: Implement async generators
2023-07-14 21:57:49 +01:00
// Simplification: The only abrupt completion we receive from AsyncFunctionDriverWrapper or AsyncGenerator is Type::Throw
LibJS: Align codegen AwaitExpressions to YieldExpressions We use generators in bytecode to approximate async functions, but the code generated by AwaitExpressions did not have the value processing paths that Yield requires, eg the `generator.throw()` path, which is used by AsyncFunctionDriverWrapper to signal Promise rejections.
2022-12-25 17:15:29 +01:00
// So we do not need to account for the Type::Return path
generator.switch_to_basic_block(throw_value_block);
generator.perform_needed_unwinds<Bytecode::Op::Throw>();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::Throw>(received_completion_value);
LibJS: Align codegen AwaitExpressions to YieldExpressions We use generators in bytecode to approximate async functions, but the code generated by AwaitExpressions did not have the value processing paths that Yield requires, eg the `generator.throw()` path, which is used by AsyncFunctionDriverWrapper to signal Promise rejections.
2022-12-25 17:15:29 +01:00
generator.switch_to_basic_block(normal_completion_continuation_block);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return received_completion_value;
LibJS/Bytecode: Implement for await of Summary: Diff Tests: +391 ✅ +15 ❌ +2 💥️ -408 📝
2023-06-27 19:24:34 +01:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> AwaitExpression::generate_bytecode(Bytecode::Generator& generator, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS/Bytecode: Implement for await of Summary: Diff Tests: +391 ✅ +15 ❌ +2 💥️ -408 📝
2023-06-27 19:24:34 +01:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto argument = TRY(m_argument->generate_bytecode(generator)).value();
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto received_completion = generator.allocate_register();
auto received_completion_type = generator.allocate_register();
auto received_completion_value = generator.allocate_register();
LibJS/Bytecode: Implement async generators
2023-07-14 21:57:49 +01:00
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(received_completion, generator.accumulator());
LibJS/Bytecode: Implement async generators
2023-07-14 21:57:49 +01:00
LibJS: Make async functions & generators faster with helper types Instead of returning internal generator results as ordinary JS::Objects with properties, we now use GeneratorResult and CompletionCell which both inherit from Cell directly and allow efficient access to state. 1.59x speedup on JetStream3/lazy-collections.js :^)
2025-03-31 09:32:39 +01:00
return generate_await(generator, argument, received_completion, received_completion_type, received_completion_value);
LibJS: Implement async functions as generator functions in BC mode This applies a simple transformation, and adds a simple wrapper that translates the generator interface to the async function interface.
2021-11-11 00:46:07 +03:30
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> WithStatement::generate_bytecode(Bytecode::Generator& generator, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS: Implement bytecode generation for WithStatement
2022-03-13 16:01:18 +03:30
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto object = TRY(m_object->generate_bytecode(generator)).value();
generator.emit<Bytecode::Op::EnterObjectEnvironment>(object);
LibJS/Bytecode: Setup lexical environment boundary for with statements This allows us to properly unwind the object environment for `with` on a block terminating instruction, e.g. an unconditional throw.
2022-03-14 02:35:45 +00:00
// EnterObjectEnvironment sets the running execution context's lexical_environment to a new Object Environment.
generator.start_boundary(Bytecode::Generator::BlockBoundaryType::LeaveLexicalEnvironment);
LibJS/Bytecode: Make sure empty `with` statement results in `undefined` 2 new passes on test262. :^)
2023-07-02 10:28:36 +02:00
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto body_result = TRY(m_body->generate_bytecode(generator));
if (!body_result.has_value())
body_result = generator.add_constant(js_undefined());
LibJS/Bytecode: Setup lexical environment boundary for with statements This allows us to properly unwind the object environment for `with` on a block terminating instruction, e.g. an unconditional throw.
2022-03-14 02:35:45 +00:00
generator.end_boundary(Bytecode::Generator::BlockBoundaryType::LeaveLexicalEnvironment);
if (!generator.is_current_block_terminated())
LibJS/Bytecode: Simplify creating/leaving lexical environment Since we no longer need to create or leave var environments directly in bytecode, we can streamline the two instructions by making them always operate on the lexical environment.
2023-06-16 16:43:24 +02:00
generator.emit<Bytecode::Op::LeaveLexicalEnvironment>();
LibJS/Bytecode: Setup lexical environment boundary for with statements This allows us to properly unwind the object environment for `with` on a block terminating instruction, e.g. an unconditional throw.
2022-03-14 02:35:45 +00:00
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return body_result;
LibJS: Implement bytecode generation for WithStatement
2022-03-13 16:01:18 +03:30
}
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
enum class LHSKind {
Assignment,
VarBinding,
LexicalBinding,
};
enum class IterationKind {
Enumerate,
Iterate,
AsyncIterate,
};
// 14.7.5.6 ForIn/OfHeadEvaluation ( uninitializedBoundNames, expr, iterationKind ), https://tc39.es/ecma262/#sec-runtime-semantics-forinofheadevaluation
struct ForInOfHeadEvaluationResult {
bool is_destructuring { false };
LHSKind lhs_kind { LHSKind::Assignment };
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Optional<ScopedOperand> iterator;
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
};
LibJS: Make RefPtr and NonnullRefPtr usage const-correct This mainly affected the AST, which is now const throughout.
2023-02-19 22:07:52 +01:00
static Bytecode::CodeGenerationErrorOr<ForInOfHeadEvaluationResult> for_in_of_head_evaluation(Bytecode::Generator& generator, IterationKind iteration_kind, Variant<NonnullRefPtr<ASTNode const>, NonnullRefPtr<BindingPattern const>> const& lhs, NonnullRefPtr<ASTNode const> const& rhs)
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
{
ForInOfHeadEvaluationResult result {};
LibJS: Support `for (x in obj)` iteration in bytecode VM We were mistakenly treating these as `for (x of obj)`. By reorganizing the code a little bit, we actually support both kinds of iteration with less duplication. :^) Fixes 17 tests in test262.
2022-10-19 17:42:54 +02:00
bool entered_lexical_scope = false;
LibJS: Make RefPtr and NonnullRefPtr usage const-correct This mainly affected the AST, which is now const throughout.
2023-02-19 22:07:52 +01:00
if (auto* ast_ptr = lhs.get_pointer<NonnullRefPtr<ASTNode const>>(); ast_ptr && is<VariableDeclaration>(**ast_ptr)) {
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
// Runtime Semantics: ForInOfLoopEvaluation, for any of:
// ForInOfStatement : for ( var ForBinding in Expression ) Statement
// ForInOfStatement : for ( ForDeclaration in Expression ) Statement
// ForInOfStatement : for ( var ForBinding of AssignmentExpression ) Statement
// ForInOfStatement : for ( ForDeclaration of AssignmentExpression ) Statement
auto& variable_declaration = static_cast<VariableDeclaration const&>(**ast_ptr);
Everywhere: Stop using NonnullRefPtrVector This class had slightly confusing semantics and the added weirdness doesn't seem worth it just so we can say "." instead of "->" when iterating over a vector of NNRPs. This patch replaces NonnullRefPtrVector<T> with Vector<NNRP<T>>.
2023-03-06 14:17:01 +01:00
result.is_destructuring = variable_declaration.declarations().first()->target().has<NonnullRefPtr<BindingPattern const>>();
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
result.lhs_kind = variable_declaration.is_lexical_declaration() ? LHSKind::LexicalBinding : LHSKind::VarBinding;
LibJS/Bytecode: Implement Annex B Initializers in ForIn Statement Heads
2023-06-28 09:07:33 +02:00
if (variable_declaration.declaration_kind() == DeclarationKind::Var) {
// B.3.5 Initializers in ForIn Statement Heads, https://tc39.es/ecma262/#sec-initializers-in-forin-statement-heads
auto& variable = variable_declaration.declarations().first();
if (variable->init()) {
VERIFY(variable->target().has<NonnullRefPtr<Identifier const>>());
LibJS: Update bytecode generator to use local variables - Update ECMAScriptFunctionObject::function_declaration_instantiation to initialize local variables - Introduce GetLocal, SetLocal, TypeofLocal that will be used to operate on local variables. - Update bytecode generator to emit instructions for local variables
2023-07-05 02:17:10 +02:00
auto identifier = variable->target().get<NonnullRefPtr<Identifier const>>();
auto identifier_table_ref = generator.intern_identifier(identifier->string());
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto value = TRY(generator.emit_named_evaluation_if_anonymous_function(*variable->init(), identifier_table_ref)).value();
generator.emit_set_variable(*identifier, value);
LibJS/Bytecode: Implement Annex B Initializers in ForIn Statement Heads
2023-06-28 09:07:33 +02:00
}
} else {
LibJS/Bytecode: Skip CreateVariable for locals in "for" loop head CreateVariable is not needed for locals because they are not stored in environment and created binding will not be used. Also if all variables in loop initialization sections are local then CreateLexicalEnvironment and LeaveLexicalEnvironment can also be ommitted.
2023-07-13 21:30:36 +02:00
auto has_non_local_variables = false;
MUST(variable_declaration.for_each_bound_identifier([&](auto const& identifier) {
if (!identifier.is_local())
has_non_local_variables = true;
LibJS: Don't discard ThrowCompletionOr<void> from declaration iteration
2023-02-27 22:13:37 +00:00
}));
LibJS/Bytecode: Skip CreateVariable for locals in "for" loop head CreateVariable is not needed for locals because they are not stored in environment and created binding will not be used. Also if all variables in loop initialization sections are local then CreateLexicalEnvironment and LeaveLexicalEnvironment can also be ommitted.
2023-07-13 21:30:36 +02:00
if (has_non_local_variables) {
// 1. Let oldEnv be the running execution context's LexicalEnvironment.
// NOTE: 'uninitializedBoundNames' refers to the lexical bindings (i.e. Const/Let) present in the second and last form.
// 2. If uninitializedBoundNames is not an empty List, then
entered_lexical_scope = true;
// a. Assert: uninitializedBoundNames has no duplicate entries.
// b. Let newEnv be NewDeclarativeEnvironment(oldEnv).
generator.begin_variable_scope();
// c. For each String name of uninitializedBoundNames, do
// NOTE: Nothing in the callback throws an exception.
MUST(variable_declaration.for_each_bound_identifier([&](auto const& identifier) {
if (identifier.is_local())
return;
// i. Perform ! newEnv.CreateMutableBinding(name, false).
auto interned_identifier = generator.intern_identifier(identifier.string());
generator.emit<Bytecode::Op::CreateVariable>(interned_identifier, Bytecode::Op::EnvironmentMode::Lexical, false);
}));
// d. Set the running execution context's LexicalEnvironment to newEnv.
// NOTE: Done by CreateLexicalEnvironment.
}
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
}
} else {
// Runtime Semantics: ForInOfLoopEvaluation, for any of:
// ForInOfStatement : for ( LeftHandSideExpression in Expression ) Statement
// ForInOfStatement : for ( LeftHandSideExpression of AssignmentExpression ) Statement
result.lhs_kind = LHSKind::Assignment;
LibJS: Support `for (x in obj)` iteration in bytecode VM We were mistakenly treating these as `for (x of obj)`. By reorganizing the code a little bit, we actually support both kinds of iteration with less duplication. :^) Fixes 17 tests in test262.
2022-10-19 17:42:54 +02:00
}
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
LibJS: Support `for (x in obj)` iteration in bytecode VM We were mistakenly treating these as `for (x of obj)`. By reorganizing the code a little bit, we actually support both kinds of iteration with less duplication. :^) Fixes 17 tests in test262.
2022-10-19 17:42:54 +02:00
// 3. Let exprRef be the result of evaluating expr.
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto object = TRY(rhs->generate_bytecode(generator)).value();
LibJS: Support `for (x in obj)` iteration in bytecode VM We were mistakenly treating these as `for (x of obj)`. By reorganizing the code a little bit, we actually support both kinds of iteration with less duplication. :^) Fixes 17 tests in test262.
2022-10-19 17:42:54 +02:00
// 4. Set the running execution context's LexicalEnvironment to oldEnv.
if (entered_lexical_scope)
generator.end_variable_scope();
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
LibJS: Support `for (x in obj)` iteration in bytecode VM We were mistakenly treating these as `for (x of obj)`. By reorganizing the code a little bit, we actually support both kinds of iteration with less duplication. :^) Fixes 17 tests in test262.
2022-10-19 17:42:54 +02:00
// 5. Let exprValue be ? GetValue(exprRef).
// NOTE: No need to store this anywhere.
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto iterator = generator.allocate_register();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
LibJS: Support `for (x in obj)` iteration in bytecode VM We were mistakenly treating these as `for (x of obj)`. By reorganizing the code a little bit, we actually support both kinds of iteration with less duplication. :^) Fixes 17 tests in test262.
2022-10-19 17:42:54 +02:00
// 6. If iterationKind is enumerate, then
if (iteration_kind == IterationKind::Enumerate) {
// a. If exprValue is undefined or null, then
auto& nullish_block = generator.make_block();
auto& continuation_block = generator.make_block();
LibJS: Remove almost all uses of Op::Jump::set_targets() We should initialize jump targets when constructing the jump instruction instead of doing it later. This was already the case in all construction sites but one. This first patch converts all those sites to pass final targets to the constructor directly.
2023-09-28 12:43:11 +02:00
generator.emit<Bytecode::Op::JumpNullish>(
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
object,
LibJS: Remove almost all uses of Op::Jump::set_targets() We should initialize jump targets when constructing the jump instruction instead of doing it later. This was already the case in all construction sites but one. This first patch converts all those sites to pass final targets to the constructor directly.
2023-09-28 12:43:11 +02:00
Bytecode::Label { nullish_block },
Bytecode::Label { continuation_block });
LibJS: Support `for (x in obj)` iteration in bytecode VM We were mistakenly treating these as `for (x of obj)`. By reorganizing the code a little bit, we actually support both kinds of iteration with less duplication. :^) Fixes 17 tests in test262.
2022-10-19 17:42:54 +02:00
// i. Return Completion Record { [[Type]]: break, [[Value]]: empty, [[Target]]: empty }.
generator.switch_to_basic_block(nullish_block);
LibJS: Simplify `Generator::perform_needed_unwinds` This does not need to cater to the needs of `break` and `continue anymore, which allows us to simplify it a bit.
2022-11-25 16:42:29 +01:00
generator.generate_break();
LibJS: Support `for (x in obj)` iteration in bytecode VM We were mistakenly treating these as `for (x of obj)`. By reorganizing the code a little bit, we actually support both kinds of iteration with less duplication. :^) Fixes 17 tests in test262.
2022-10-19 17:42:54 +02:00
generator.switch_to_basic_block(continuation_block);
// b. Let obj be ! ToObject(exprValue).
// NOTE: GetObjectPropertyIterator does this.
// c. Let iterator be EnumerateObjectProperties(obj).
// d. Let nextMethod be ! GetV(iterator, "next").
// e. Return the Iterator Record { [[Iterator]]: iterator, [[NextMethod]]: nextMethod, [[Done]]: false }.
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::GetObjectPropertyIterator>(iterator, object);
LibJS: Support `for (x in obj)` iteration in bytecode VM We were mistakenly treating these as `for (x of obj)`. By reorganizing the code a little bit, we actually support both kinds of iteration with less duplication. :^) Fixes 17 tests in test262.
2022-10-19 17:42:54 +02:00
}
// 7. Else,
else {
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
// a. Assert: iterationKind is iterate or async-iterate.
LibJS: Make GetIterator's hint parameter required This is an editorial change in the ECMA-262 spec. See: https://github.com/tc39/ecma262/commit/2562811
2023-07-18 14:52:21 -04:00
// b. If iterationKind is async-iterate, let iteratorKind be async.
// c. Else, let iteratorKind be sync.
auto iterator_kind = iteration_kind == IterationKind::AsyncIterate ? IteratorHint::Async : IteratorHint::Sync;
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
LibJS: Make GetIterator's hint parameter required This is an editorial change in the ECMA-262 spec. See: https://github.com/tc39/ecma262/commit/2562811
2023-07-18 14:52:21 -04:00
// d. Return ? GetIterator(exprValue, iteratorKind).
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::GetIterator>(iterator, object, iterator_kind);
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
}
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
result.iterator = iterator;
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
return result;
}
// 14.7.5.7 ForIn/OfBodyEvaluation ( lhs, stmt, iteratorRecord, iterationKind, lhsKind, labelSet [ , iteratorKind ] ), https://tc39.es/ecma262/#sec-runtime-semantics-forin-div-ofbodyevaluation-lhs-stmt-iterator-lhskind-labelset
LibJS: Use FlyString in PropertyKey instead of DeprecatedFlyString This required dealing with *substantial* fallout.
2025-03-18 18:08:02 -05:00
static Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> for_in_of_body_evaluation(Bytecode::Generator& generator, ASTNode const& node, Variant<NonnullRefPtr<ASTNode const>, NonnullRefPtr<BindingPattern const>> const& lhs, ASTNode const& body, ForInOfHeadEvaluationResult const& head_result, Vector<FlyString> const& label_set, Bytecode::BasicBlock& loop_end, Bytecode::BasicBlock& loop_update, IteratorHint iterator_kind = IteratorHint::Sync, [[maybe_unused]] Optional<ScopedOperand> preferred_dst = {})
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
{
LibJS/Bytecode: Implement for await of Summary: Diff Tests: +391 ✅ +15 ❌ +2 💥️ -408 📝
2023-06-27 19:24:34 +01:00
// 1. If iteratorKind is not present, set iteratorKind to sync.
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
// 2. Let oldEnv be the running execution context's LexicalEnvironment.
bool has_lexical_binding = false;
// 3. Let V be undefined.
LibJS/Bytecode: Don't bother propagating completion values in functions The last completion value in a function is not exposed to the language, since functions always either return something, or undefined. Given this, we can avoid emitting code that propagates the completion value from various statements, as long as we know we're generating code for a context where the completion value is not accessible. In practical terms, this means that function code gets to do less completion shuffling, while global and eval code has to keep doing it.
2024-05-14 10:57:06 +02:00
Optional<ScopedOperand> completion;
if (generator.must_propagate_completion()) {
completion = generator.allocate_register();
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(*completion, generator.add_constant(js_undefined()));
LibJS/Bytecode: Don't bother propagating completion values in functions The last completion value in a function is not exposed to the language, since functions always either return something, or undefined. Given this, we can avoid emitting code that propagates the completion value from various statements, as long as we know we're generating code for a context where the completion value is not accessible. In practical terms, this means that function code gets to do less completion shuffling, while global and eval code has to keep doing it.
2024-05-14 10:57:06 +02:00
}
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
// 4. Let destructuring be IsDestructuring of lhs.
auto destructuring = head_result.is_destructuring;
// 5. If destructuring is true and if lhsKind is assignment, then
LibJS/Bytecode: Implement var/lexical binding destructuring in for/of
2022-12-09 18:47:51 +00:00
if (destructuring && head_result.lhs_kind == LHSKind::Assignment) {
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
// a. Assert: lhs is a LeftHandSideExpression.
// b. Let assignmentPattern be the AssignmentPattern that is covered by lhs.
// FIXME: Implement this.
return Bytecode::CodeGenerationError {
&node,
LibJS/Bytecode: Implement var/lexical binding destructuring in for/of
2022-12-09 18:47:51 +00:00
"Unimplemented: assignment destructuring in for/of"sv,
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
};
}
// 6. Repeat,
generator.emit<Bytecode::Op::Jump>(Bytecode::Label { loop_update });
generator.switch_to_basic_block(loop_update);
LibJS/Bytecode: Implement break/continue labels This is done by keeping track of all the labels that apply to a given break/continue scope alongside their bytecode target. When a break/continue with a label is generated, we scan from the most inner scope to the most outer scope looking for the label, performing any necessary unwinds on the way. Once the label is found, it is then jumped to.
2022-06-11 23:09:37 +01:00
generator.begin_continuable_scope(Bytecode::Label { loop_update }, label_set);
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
// a. Let nextResult be ? Call(iteratorRecord.[[NextMethod]], iteratorRecord.[[Iterator]]).
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto next_result = generator.allocate_register();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::IteratorNext>(next_result, *head_result.iterator);
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
LibJS/Bytecode: Implement for await of Summary: Diff Tests: +391 ✅ +15 ❌ +2 💥️ -408 📝
2023-06-27 19:24:34 +01:00
// b. If iteratorKind is async, set nextResult to ? Await(nextResult).
LibJS/Bytecode: Implement async generators
2023-07-14 21:57:49 +01:00
if (iterator_kind == IteratorHint::Async) {
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto received_completion = generator.allocate_register();
auto received_completion_type = generator.allocate_register();
auto received_completion_value = generator.allocate_register();
LibJS/Bytecode: Implement async generators
2023-07-14 21:57:49 +01:00
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(received_completion, generator.accumulator());
LibJS: Make async functions & generators faster with helper types Instead of returning internal generator results as ordinary JS::Objects with properties, we now use GeneratorResult and CompletionCell which both inherit from Cell directly and allow efficient access to state. 1.59x speedup on JetStream3/lazy-collections.js :^)
2025-03-31 09:32:39 +01:00
auto new_result = generate_await(generator, next_result, received_completion, received_completion_type, received_completion_value);
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(next_result, new_result);
LibJS/Bytecode: Implement async generators
2023-07-14 21:57:49 +01:00
}
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
// c. If Type(nextResult) is not Object, throw a TypeError exception.
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::ThrowIfNotObject>(next_result);
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
// d. Let done be ? IteratorComplete(nextResult).
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto done = generator.allocate_register();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit_iterator_complete(done, next_result);
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
// e. If done is true, return V.
auto& loop_continue = generator.make_block();
LibJS/Bytecode: Do basic compare-and-jump peephole optimization We now fuse sequences like [LessThan, JumpIf] to JumpLessThan. This is only allowed for temporaries (i.e VM registers) with no other references to them.
2024-05-09 15:13:31 +02:00
generator.emit_jump_if(
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
done,
LibJS: Remove almost all uses of Op::Jump::set_targets() We should initialize jump targets when constructing the jump instruction instead of doing it later. This was already the case in all construction sites but one. This first patch converts all those sites to pass final targets to the constructor directly.
2023-09-28 12:43:11 +02:00
Bytecode::Label { loop_end },
Bytecode::Label { loop_continue });
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
generator.switch_to_basic_block(loop_continue);
// f. Let nextValue be ? IteratorValue(nextResult).
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto next_value = generator.allocate_register();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit_iterator_value(next_value, next_result);
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
// g. If lhsKind is either assignment or varBinding, then
if (head_result.lhs_kind != LHSKind::LexicalBinding) {
// i. If destructuring is false, then
if (!destructuring) {
// 1. Let lhsRef be the result of evaluating lhs. (It may be evaluated repeatedly.)
// NOTE: We're skipping all the completion stuff that the spec does, as the unwinding mechanism will take case of doing that.
if (head_result.lhs_kind == LHSKind::VarBinding) {
LibJS: Make RefPtr and NonnullRefPtr usage const-correct This mainly affected the AST, which is now const throughout.
2023-02-19 22:07:52 +01:00
auto& declaration = static_cast<VariableDeclaration const&>(*lhs.get<NonnullRefPtr<ASTNode const>>());
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
VERIFY(declaration.declarations().size() == 1);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
TRY(assign_value_to_variable_declarator(generator, declaration.declarations().first(), declaration, next_value));
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
} else {
LibJS: Make RefPtr and NonnullRefPtr usage const-correct This mainly affected the AST, which is now const throughout.
2023-02-19 22:07:52 +01:00
if (auto ptr = lhs.get_pointer<NonnullRefPtr<ASTNode const>>()) {
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
TRY(generator.emit_store_to_reference(**ptr, next_value));
LibJS: Don't assume that for-in/of target is a variable on LHS::Assign e.g. `for ([foo.bar] in ...)` is actually a binding pattern.
2022-03-31 03:09:36 +04:30
} else {
LibJS: Make RefPtr and NonnullRefPtr usage const-correct This mainly affected the AST, which is now const throughout.
2023-02-19 22:07:52 +01:00
auto& binding_pattern = lhs.get<NonnullRefPtr<BindingPattern const>>();
LibJS: Delete create_variable param in BindingPattern::generate_bytecode It's no longer used, because we assume that caller of this function has already taken care of variable creation and initialization.
2025-04-22 00:33:54 +02:00
TRY(binding_pattern->generate_bytecode(generator, Bytecode::Op::BindingInitializationMode::Set, next_value));
LibJS: Don't assume that for-in/of target is a variable on LHS::Assign e.g. `for ([foo.bar] in ...)` is actually a binding pattern.
2022-03-31 03:09:36 +04:30
}
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
}
}
}
// h. Else,
else {
// i. Assert: lhsKind is lexicalBinding.
// ii. Assert: lhs is a ForDeclaration.
// iii. Let iterationEnv be NewDeclarativeEnvironment(oldEnv).
// iv. Perform ForDeclarationBindingInstantiation of lhs with argument iterationEnv.
// v. Set the running execution context's LexicalEnvironment to iterationEnv.
// 14.7.5.4 Runtime Semantics: ForDeclarationBindingInstantiation, https://tc39.es/ecma262/#sec-runtime-semantics-fordeclarationbindinginstantiation
// 1. Assert: environment is a declarative Environment Record.
// NOTE: We just made it.
LibJS: Make RefPtr and NonnullRefPtr usage const-correct This mainly affected the AST, which is now const throughout.
2023-02-19 22:07:52 +01:00
auto& variable_declaration = static_cast<VariableDeclaration const&>(*lhs.get<NonnullRefPtr<ASTNode const>>());
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
// 2. For each element name of the BoundNames of ForBinding, do
LibJS: Don't discard ThrowCompletionOr<void> from declaration iteration
2023-02-27 22:13:37 +00:00
// NOTE: Nothing in the callback throws an exception.
LibJS: Elide empty lexical environment in for..in/of blocks When all the variables in a for..in/of block's lexical scope have been turned into locals, we don't need to create and immediately abandon an empty environment for them. This avoid environment allocation in cases like this: function foo(a) { for (const x of a) { } }
2023-12-06 15:07:42 +01:00
auto has_non_local_variables = false;
LibJS/Bytecode: Skip CreateVariable for locals in "for" loop head CreateVariable is not needed for locals because they are not stored in environment and created binding will not be used. Also if all variables in loop initialization sections are local then CreateLexicalEnvironment and LeaveLexicalEnvironment can also be ommitted.
2023-07-13 21:30:36 +02:00
MUST(variable_declaration.for_each_bound_identifier([&](auto const& identifier) {
LibJS: Elide empty lexical environment in for..in/of blocks When all the variables in a for..in/of block's lexical scope have been turned into locals, we don't need to create and immediately abandon an empty environment for them. This avoid environment allocation in cases like this: function foo(a) { for (const x of a) { } }
2023-12-06 15:07:42 +01:00
if (!identifier.is_local())
has_non_local_variables = true;
LibJS: Don't discard ThrowCompletionOr<void> from declaration iteration
2023-02-27 22:13:37 +00:00
}));
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
LibJS: Elide empty lexical environment in for..in/of blocks When all the variables in a for..in/of block's lexical scope have been turned into locals, we don't need to create and immediately abandon an empty environment for them. This avoid environment allocation in cases like this: function foo(a) { for (const x of a) { } }
2023-12-06 15:07:42 +01:00
if (has_non_local_variables) {
generator.begin_variable_scope();
has_lexical_binding = true;
MUST(variable_declaration.for_each_bound_identifier([&](auto const& identifier) {
if (identifier.is_local())
return;
auto interned_identifier = generator.intern_identifier(identifier.string());
// a. If IsConstantDeclaration of LetOrConst is true, then
if (variable_declaration.is_constant_declaration()) {
// i. Perform ! environment.CreateImmutableBinding(name, true).
generator.emit<Bytecode::Op::CreateVariable>(interned_identifier, Bytecode::Op::EnvironmentMode::Lexical, true, false, true);
}
// b. Else,
else {
// i. Perform ! environment.CreateMutableBinding(name, false).
generator.emit<Bytecode::Op::CreateVariable>(interned_identifier, Bytecode::Op::EnvironmentMode::Lexical, false);
}
}));
// 3. Return unused.
// NOTE: No need to do that as we've inlined this.
}
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
// vi. If destructuring is false, then
if (!destructuring) {
// 1. Assert: lhs binds a single name.
// 2. Let lhsName be the sole element of BoundNames of lhs.
LibJS: Update bytecode generator to use local variables - Update ECMAScriptFunctionObject::function_declaration_instantiation to initialize local variables - Introduce GetLocal, SetLocal, TypeofLocal that will be used to operate on local variables. - Update bytecode generator to emit instructions for local variables
2023-07-05 02:17:10 +02:00
auto lhs_name = variable_declaration.declarations().first()->target().get<NonnullRefPtr<Identifier const>>();
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
// 3. Let lhsRef be ! ResolveBinding(lhsName).
// NOTE: We're skipping all the completion stuff that the spec does, as the unwinding mechanism will take case of doing that.
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
LibJS/Bytecode: Split SetVariable into four separate instructions Instead of SetVariable having 2x2 modes for variable/lexical and initialize/set, those 4 modes are now separate instructions, which makes each instruction much less branchy.
2024-05-14 11:30:30 +02:00
generator.emit_set_variable(*lhs_name, next_value, Bytecode::Op::BindingInitializationMode::Initialize, Bytecode::Op::EnvironmentMode::Lexical);
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
}
}
// i. If destructuring is false, then
if (!destructuring) {
// i. If lhsRef is an abrupt completion, then
// 1. Let status be lhsRef.
// ii. Else if lhsKind is lexicalBinding, then
// 1. Let status be Completion(InitializeReferencedBinding(lhsRef, nextValue)).
// iii. Else,
// 1. Let status be Completion(PutValue(lhsRef, nextValue)).
// NOTE: This is performed above.
}
// j. Else,
else {
LibJS/Bytecode: Implement var/lexical binding destructuring in for/of
2022-12-09 18:47:51 +00:00
// FIXME: i. If lhsKind is assignment, then
// 1. Let status be Completion(DestructuringAssignmentEvaluation of assignmentPattern with argument nextValue).
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
// ii. Else if lhsKind is varBinding, then
// 1. Assert: lhs is a ForBinding.
// 2. Let status be Completion(BindingInitialization of lhs with arguments nextValue and undefined).
// iii. Else,
// 1. Assert: lhsKind is lexicalBinding.
// 2. Assert: lhs is a ForDeclaration.
// 3. Let status be Completion(ForDeclarationBindingInitialization of lhs with arguments nextValue and iterationEnv).
LibJS/Bytecode: Implement var/lexical binding destructuring in for/of
2022-12-09 18:47:51 +00:00
if (head_result.lhs_kind == LHSKind::VarBinding || head_result.lhs_kind == LHSKind::LexicalBinding) {
LibJS: Make RefPtr and NonnullRefPtr usage const-correct This mainly affected the AST, which is now const throughout.
2023-02-19 22:07:52 +01:00
auto& declaration = static_cast<VariableDeclaration const&>(*lhs.get<NonnullRefPtr<ASTNode const>>());
LibJS/Bytecode: Implement var/lexical binding destructuring in for/of
2022-12-09 18:47:51 +00:00
VERIFY(declaration.declarations().size() == 1);
Everywhere: Stop using NonnullRefPtrVector This class had slightly confusing semantics and the added weirdness doesn't seem worth it just so we can say "." instead of "->" when iterating over a vector of NNRPs. This patch replaces NonnullRefPtrVector<T> with Vector<NNRP<T>>.
2023-03-06 14:17:01 +01:00
auto& binding_pattern = declaration.declarations().first()->target().get<NonnullRefPtr<BindingPattern const>>();
LibJS: Move BindingPattern bytecode generation into a method Preparation for upcoming function where binding pattern will have to be used outside of ASTCodegen.cpp
2024-05-09 05:00:07 +00:00
(void)TRY(binding_pattern->generate_bytecode(
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator,
LibJS/Bytecode: Split SetVariable into four separate instructions Instead of SetVariable having 2x2 modes for variable/lexical and initialize/set, those 4 modes are now separate instructions, which makes each instruction much less branchy.
2024-05-14 11:30:30 +02:00
head_result.lhs_kind == LHSKind::VarBinding ? Bytecode::Op::BindingInitializationMode::Set : Bytecode::Op::BindingInitializationMode::Initialize,
LibJS: Delete create_variable param in BindingPattern::generate_bytecode It's no longer used, because we assume that caller of this function has already taken care of variable creation and initialization.
2025-04-22 00:33:54 +02:00
next_value));
LibJS/Bytecode: Implement var/lexical binding destructuring in for/of
2022-12-09 18:47:51 +00:00
} else {
return Bytecode::CodeGenerationError {
&node,
"Unimplemented: assignment destructuring in for/of"sv,
};
}
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
}
// FIXME: Implement iteration closure.
// k. If status is an abrupt completion, then
// i. Set the running execution context's LexicalEnvironment to oldEnv.
// ii. If iteratorKind is async, return ? AsyncIteratorClose(iteratorRecord, status).
// iii. If iterationKind is enumerate, then
// 1. Return ? status.
// iv. Else,
// 1. Assert: iterationKind is iterate.
// 2. Return ? IteratorClose(iteratorRecord, status).
// l. Let result be the result of evaluating stmt.
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto result = TRY(body.generate_bytecode(generator));
LibJS/Bytecode: Leave `for in` and `for of` with right completion value 14 new passes on test262. :^)
2023-07-05 14:07:20 +02:00
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
// m. Set the running execution context's LexicalEnvironment to oldEnv.
if (has_lexical_binding)
generator.end_variable_scope();
generator.end_continuable_scope();
generator.end_breakable_scope();
// NOTE: If we're here, then the loop definitely continues.
// n. If LoopContinues(result, labelSet) is false, then
// i. If iterationKind is enumerate, then
// 1. Return ? UpdateEmpty(result, V).
// ii. Else,
// 1. Assert: iterationKind is iterate.
// 2. Set status to Completion(UpdateEmpty(result, V)).
// 3. If iteratorKind is async, return ? AsyncIteratorClose(iteratorRecord, status).
// 4. Return ? IteratorClose(iteratorRecord, status).
// o. If result.[[Value]] is not empty, set V to result.[[Value]].
LibJS: Generate update Jump in for/in/of only if block is not terminated The body of for/in/of can contain an unconditional block terminator (e.g. return, throw), so we have to check for that before generating the Jump to the loop update block.
2022-03-27 18:46:25 +01:00
// The body can contain an unconditional block terminator (e.g. return, throw), so we have to check for that before generating the Jump.
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
if (!generator.is_current_block_terminated()) {
LibJS/Bytecode: Don't bother propagating completion values in functions The last completion value in a function is not exposed to the language, since functions always either return something, or undefined. Given this, we can avoid emitting code that propagates the completion value from various statements, as long as we know we're generating code for a context where the completion value is not accessible. In practical terms, this means that function code gets to do less completion shuffling, while global and eval code has to keep doing it.
2024-05-14 10:57:06 +02:00
if (generator.must_propagate_completion()) {
if (result.has_value())
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(*completion, *result);
LibJS/Bytecode: Don't bother propagating completion values in functions The last completion value in a function is not exposed to the language, since functions always either return something, or undefined. Given this, we can avoid emitting code that propagates the completion value from various statements, as long as we know we're generating code for a context where the completion value is not accessible. In practical terms, this means that function code gets to do less completion shuffling, while global and eval code has to keep doing it.
2024-05-14 10:57:06 +02:00
}
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
LibJS: Remove almost all uses of Op::Jump::set_targets() We should initialize jump targets when constructing the jump instruction instead of doing it later. This was already the case in all construction sites but one. This first patch converts all those sites to pass final targets to the constructor directly.
2023-09-28 12:43:11 +02:00
generator.emit<Bytecode::Op::Jump>(Bytecode::Label { loop_update });
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
}
LibJS: Generate update Jump in for/in/of only if block is not terminated The body of for/in/of can contain an unconditional block terminator (e.g. return, throw), so we have to check for that before generating the Jump to the loop update block.
2022-03-27 18:46:25 +01:00
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
generator.switch_to_basic_block(loop_end);
LibJS/Bytecode: Don't bother propagating completion values in functions The last completion value in a function is not exposed to the language, since functions always either return something, or undefined. Given this, we can avoid emitting code that propagates the completion value from various statements, as long as we know we're generating code for a context where the completion value is not accessible. In practical terms, this means that function code gets to do less completion shuffling, while global and eval code has to keep doing it.
2024-05-14 10:57:06 +02:00
return completion;
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> ForInStatement::generate_bytecode(Bytecode::Generator& generator, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS/Bytecode: Implement break/continue labels This is done by keeping track of all the labels that apply to a given break/continue scope alongside their bytecode target. When a break/continue with a label is generated, we scan from the most inner scope to the most outer scope looking for the label, performing any necessary unwinds on the way. Once the label is found, it is then jumped to.
2022-06-11 23:09:37 +01:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS/Bytecode: Implement break/continue labels This is done by keeping track of all the labels that apply to a given break/continue scope alongside their bytecode target. When a break/continue with a label is generated, we scan from the most inner scope to the most outer scope looking for the label, performing any necessary unwinds on the way. Once the label is found, it is then jumped to.
2022-06-11 23:09:37 +01:00
return generate_labelled_evaluation(generator, {});
}
// 14.7.5.5 Runtime Semantics: ForInOfLoopEvaluation, https://tc39.es/ecma262/#sec-runtime-semantics-forinofloopevaluation
LibJS: Use FlyString in PropertyKey instead of DeprecatedFlyString This required dealing with *substantial* fallout.
2025-03-18 18:08:02 -05:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> ForInStatement::generate_labelled_evaluation(Bytecode::Generator& generator, Vector<FlyString> const& label_set, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
{
auto& loop_end = generator.make_block();
auto& loop_update = generator.make_block();
LibJS/Bytecode: Implement break/continue labels This is done by keeping track of all the labels that apply to a given break/continue scope alongside their bytecode target. When a break/continue with a label is generated, we scan from the most inner scope to the most outer scope looking for the label, performing any necessary unwinds on the way. Once the label is found, it is then jumped to.
2022-06-11 23:09:37 +01:00
generator.begin_breakable_scope(Bytecode::Label { loop_end }, label_set);
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
auto head_result = TRY(for_in_of_head_evaluation(generator, IterationKind::Enumerate, m_lhs, m_rhs));
LibJS/Bytecode: Implement break/continue labels This is done by keeping track of all the labels that apply to a given break/continue scope alongside their bytecode target. When a break/continue with a label is generated, we scan from the most inner scope to the most outer scope looking for the label, performing any necessary unwinds on the way. Once the label is found, it is then jumped to.
2022-06-11 23:09:37 +01:00
return for_in_of_body_evaluation(generator, *this, m_lhs, body(), head_result, label_set, loop_end, loop_update);
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> ForOfStatement::generate_bytecode(Bytecode::Generator& generator, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS/Bytecode: Implement break/continue labels This is done by keeping track of all the labels that apply to a given break/continue scope alongside their bytecode target. When a break/continue with a label is generated, we scan from the most inner scope to the most outer scope looking for the label, performing any necessary unwinds on the way. Once the label is found, it is then jumped to.
2022-06-11 23:09:37 +01:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS/Bytecode: Implement break/continue labels This is done by keeping track of all the labels that apply to a given break/continue scope alongside their bytecode target. When a break/continue with a label is generated, we scan from the most inner scope to the most outer scope looking for the label, performing any necessary unwinds on the way. Once the label is found, it is then jumped to.
2022-06-11 23:09:37 +01:00
return generate_labelled_evaluation(generator, {});
}
LibJS: Use FlyString in PropertyKey instead of DeprecatedFlyString This required dealing with *substantial* fallout.
2025-03-18 18:08:02 -05:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> ForOfStatement::generate_labelled_evaluation(Bytecode::Generator& generator, Vector<FlyString> const& label_set, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
{
auto& loop_end = generator.make_block();
auto& loop_update = generator.make_block();
LibJS/Bytecode: Implement break/continue labels This is done by keeping track of all the labels that apply to a given break/continue scope alongside their bytecode target. When a break/continue with a label is generated, we scan from the most inner scope to the most outer scope looking for the label, performing any necessary unwinds on the way. Once the label is found, it is then jumped to.
2022-06-11 23:09:37 +01:00
generator.begin_breakable_scope(Bytecode::Label { loop_end }, label_set);
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
auto head_result = TRY(for_in_of_head_evaluation(generator, IterationKind::Iterate, m_lhs, m_rhs));
LibJS/Bytecode: Implement break/continue labels This is done by keeping track of all the labels that apply to a given break/continue scope alongside their bytecode target. When a break/continue with a label is generated, we scan from the most inner scope to the most outer scope looking for the label, performing any necessary unwinds on the way. Once the label is found, it is then jumped to.
2022-06-11 23:09:37 +01:00
return for_in_of_body_evaluation(generator, *this, m_lhs, body(), head_result, label_set, loop_end, loop_update);
LibJS: Implement bytecode generation for For-In/Of statements This also implements the rather interesting behaviour that #12772 relies on, so this fixes that bug in BC mode (the AST interp remains affected).
2022-03-18 20:18:19 +03:30
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> ForAwaitOfStatement::generate_bytecode(Bytecode::Generator& generator, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS/Bytecode: Implement for await of Summary: Diff Tests: +391 ✅ +15 ❌ +2 💥️ -408 📝
2023-06-27 19:24:34 +01:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS/Bytecode: Implement for await of Summary: Diff Tests: +391 ✅ +15 ❌ +2 💥️ -408 📝
2023-06-27 19:24:34 +01:00
return generate_labelled_evaluation(generator, {});
}
LibJS: Use FlyString in PropertyKey instead of DeprecatedFlyString This required dealing with *substantial* fallout.
2025-03-18 18:08:02 -05:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> ForAwaitOfStatement::generate_labelled_evaluation(Bytecode::Generator& generator, Vector<FlyString> const& label_set, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS/Bytecode: Implement for await of Summary: Diff Tests: +391 ✅ +15 ❌ +2 💥️ -408 📝
2023-06-27 19:24:34 +01:00
{
auto& loop_end = generator.make_block();
auto& loop_update = generator.make_block();
generator.begin_breakable_scope(Bytecode::Label { loop_end }, label_set);
auto head_result = TRY(for_in_of_head_evaluation(generator, IterationKind::AsyncIterate, m_lhs, m_rhs));
return for_in_of_body_evaluation(generator, *this, m_lhs, m_body, head_result, label_set, loop_end, loop_update, IteratorHint::Async);
}
LibJS/Bytecode: Add support for new.target
2022-03-19 19:40:21 +00:00
// 13.3.12.1 Runtime Semantics: Evaluation, https://tc39.es/ecma262/#sec-meta-properties-runtime-semantics-evaluation
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> MetaProperty::generate_bytecode(Bytecode::Generator& generator, Optional<ScopedOperand> preferred_dst) const
LibJS/Bytecode: Add support for new.target
2022-03-19 19:40:21 +00:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS/Bytecode: Add support for new.target
2022-03-19 19:40:21 +00:00
// NewTarget : new . target
if (m_type == MetaProperty::Type::NewTarget) {
// 1. Return GetNewTarget().
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto dst = choose_dst(generator, preferred_dst);
generator.emit<Bytecode::Op::GetNewTarget>(dst);
return dst;
LibJS/Bytecode: Add support for new.target
2022-03-19 19:40:21 +00:00
}
// ImportMeta : import . meta
if (m_type == MetaProperty::Type::ImportMeta) {
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto dst = choose_dst(generator, preferred_dst);
generator.emit<Bytecode::Op::GetImportMeta>(dst);
return dst;
LibJS/Bytecode: Add support for new.target
2022-03-19 19:40:21 +00:00
}
VERIFY_NOT_REACHED();
}
LibJS/Bytecode: Support class field initializers Fixes 513 test262 tests. :^)
2023-06-17 10:11:23 +02:00
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> ClassFieldInitializerStatement::generate_bytecode(Bytecode::Generator& generator, Optional<ScopedOperand> preferred_dst) const
LibJS/Bytecode: Support class field initializers Fixes 513 test262 tests. :^)
2023-06-17 10:11:23 +02:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto value = TRY(generator.emit_named_evaluation_if_anonymous_function(*m_expression, generator.intern_identifier(m_class_field_identifier_name), preferred_dst));
LibJS/Bytecode: Support class field initializers Fixes 513 test262 tests. :^)
2023-06-17 10:11:23 +02:00
generator.perform_needed_unwinds<Bytecode::Op::Return>();
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
generator.emit<Bytecode::Op::Return>(value.has_value() ? value->operand() : Optional<Operand> {});
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return value;
LibJS/Bytecode: Support class field initializers Fixes 513 test262 tests. :^)
2023-06-17 10:11:23 +02:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
static Bytecode::CodeGenerationErrorOr<void> generate_optional_chain(Bytecode::Generator& generator, OptionalChain const& optional_chain, ScopedOperand current_value, ScopedOperand current_base, [[maybe_unused]] Optional<ScopedOperand> preferred_dst)
LibJS/Bytecode: Implement optional chaining
2023-06-17 14:50:23 +01:00
{
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Optional<ScopedOperand> new_current_value;
LibJS/Bytecode: Implement optional chaining
2023-06-17 14:50:23 +01:00
if (is<MemberExpression>(optional_chain.base())) {
auto& member_expression = static_cast<MemberExpression const&>(optional_chain.base());
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto base_and_value = TRY(get_base_and_value_from_member_expression(generator, member_expression));
new_current_value = base_and_value.value;
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(current_base, base_and_value.base);
LibJS/Bytecode: Implement optional chaining
2023-06-17 14:50:23 +01:00
} else if (is<OptionalChain>(optional_chain.base())) {
auto& sub_optional_chain = static_cast<OptionalChain const&>(optional_chain.base());
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
TRY(generate_optional_chain(generator, sub_optional_chain, current_value, current_base));
new_current_value = current_value;
LibJS/Bytecode: Implement optional chaining
2023-06-17 14:50:23 +01:00
} else {
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
new_current_value = TRY(optional_chain.base().generate_bytecode(generator)).value();
LibJS/Bytecode: Implement optional chaining
2023-06-17 14:50:23 +01:00
}
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(current_value, *new_current_value);
LibJS/Bytecode: Implement optional chaining
2023-06-17 14:50:23 +01:00
auto& load_undefined_and_jump_to_end_block = generator.make_block();
auto& end_block = generator.make_block();
for (auto& reference : optional_chain.references()) {
auto is_optional = reference.visit([](auto& ref) { return ref.mode; }) == OptionalChain::Mode::Optional;
if (is_optional) {
auto& not_nullish_block = generator.make_block();
generator.emit<Bytecode::Op::JumpNullish>(
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
current_value,
LibJS/Bytecode: Implement optional chaining
2023-06-17 14:50:23 +01:00
Bytecode::Label { load_undefined_and_jump_to_end_block },
Bytecode::Label { not_nullish_block });
generator.switch_to_basic_block(not_nullish_block);
}
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
TRY(reference.visit(
[&](OptionalChain::Call const& call) -> Bytecode::CodeGenerationErrorOr<void> {
auto arguments = TRY(arguments_to_array_for_call(generator, call.arguments)).value();
generator.emit<Bytecode::Op::CallWithArgumentArray>(Bytecode::Op::CallType::Call, current_value, current_value, current_base, arguments);
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(current_base, generator.add_constant(js_undefined()));
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return {};
LibJS/Bytecode: Implement optional chaining
2023-06-17 14:50:23 +01:00
},
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
[&](OptionalChain::ComputedReference const& ref) -> Bytecode::CodeGenerationErrorOr<void> {
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(current_base, current_value);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto property = TRY(ref.expression->generate_bytecode(generator)).value();
LibJS: Emit GetById instead of GetByValue when key is string literal Basically convert o["foo"] into o.foo when emitting bytecode. These are effectively the same thing, and the latter format opts into using an inline cache for the property lookups.
2025-04-03 14:18:24 +02:00
generator.emit_get_by_value(current_value, current_value, property);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return {};
LibJS/Bytecode: Implement optional chaining
2023-06-17 14:50:23 +01:00
},
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
[&](OptionalChain::MemberReference const& ref) -> Bytecode::CodeGenerationErrorOr<void> {
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(current_base, current_value);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit_get_by_id(current_value, current_value, generator.intern_identifier(ref.identifier->string()));
return {};
LibJS/Bytecode: Implement optional chaining
2023-06-17 14:50:23 +01:00
},
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
[&](OptionalChain::PrivateMemberReference const& ref) -> Bytecode::CodeGenerationErrorOr<void> {
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(current_base, current_value);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.emit<Bytecode::Op::GetPrivateById>(current_value, current_value, generator.intern_identifier(ref.private_identifier->string()));
return {};
LibJS/Bytecode: Implement optional chaining
2023-06-17 14:50:23 +01:00
}));
}
generator.emit<Bytecode::Op::Jump>(Bytecode::Label { end_block });
generator.switch_to_basic_block(load_undefined_and_jump_to_end_block);
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(current_value, generator.add_constant(js_undefined()));
LibJS/Bytecode: Implement optional chaining
2023-06-17 14:50:23 +01:00
generator.emit<Bytecode::Op::Jump>(Bytecode::Label { end_block });
generator.switch_to_basic_block(end_block);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return {};
LibJS/Bytecode: Implement optional chaining
2023-06-17 14:50:23 +01:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> OptionalChain::generate_bytecode(Bytecode::Generator& generator, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS/Bytecode: Implement optional chaining
2023-06-17 14:50:23 +01:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
auto current_base = generator.allocate_register();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto current_value = choose_dst(generator, preferred_dst);
LibJS: Optimize away Mov instructions when the source is the destination
2025-03-28 00:56:57 +01:00
generator.emit_mov(current_base, generator.add_constant(js_undefined()));
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
TRY(generate_optional_chain(generator, *this, current_value, current_base));
return current_value;
LibJS/Bytecode: Implement optional chaining
2023-06-17 14:50:23 +01:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> ImportCall::generate_bytecode(Bytecode::Generator& generator, Optional<ScopedOperand> preferred_dst) const
LibJS/Bytecode: Add codegen for ImportCall Also moved most of the AST ImportCall::execute() into a helper so we can share the code.
2023-06-24 15:22:16 +02:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto specifier = TRY(m_specifier->generate_bytecode(generator)).value();
LibJS/Bytecode: Add codegen for ImportCall Also moved most of the AST ImportCall::execute() into a helper so we can share the code.
2023-06-24 15:22:16 +02:00
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Optional<ScopedOperand> options;
LibJS/Bytecode: Add codegen for ImportCall Also moved most of the AST ImportCall::execute() into a helper so we can share the code.
2023-06-24 15:22:16 +02:00
if (m_options) {
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
options = TRY(m_options->generate_bytecode(generator)).value();
LibJS/Bytecode: Add codegen for ImportCall Also moved most of the AST ImportCall::execute() into a helper so we can share the code.
2023-06-24 15:22:16 +02:00
} else {
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
options = generator.add_constant(js_undefined());
LibJS/Bytecode: Add codegen for ImportCall Also moved most of the AST ImportCall::execute() into a helper so we can share the code.
2023-06-24 15:22:16 +02:00
}
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
auto dst = choose_dst(generator, preferred_dst);
generator.emit<Bytecode::Op::ImportCall>(dst, specifier, *options);
return dst;
LibJS/Bytecode: Add codegen for ImportCall Also moved most of the AST ImportCall::execute() into a helper so we can share the code.
2023-06-24 15:22:16 +02:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> ExportStatement::generate_bytecode(Bytecode::Generator& generator, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS/Bytecode: Add some basic codegen for ExportStatement This is by no means complete, but at least a bunch of test-js and test262 tests start working. :^)
2023-06-24 16:07:43 +02:00
{
LibJS: Add file & line number to bytecode VM stack traces :^) This works by adding source start/end offset to every bytecode instruction. In the future we can make this more efficient by keeping a map of bytecode ranges to source ranges in the Executable instead, but let's just get traces working first. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
2023-09-01 16:53:55 +02:00
Bytecode::Generator::SourceLocationScope scope(generator, *this);
LibJS/Bytecode: Add some basic codegen for ExportStatement This is by no means complete, but at least a bunch of test-js and test262 tests start working. :^)
2023-06-24 16:07:43 +02:00
if (!is_default_export()) {
if (m_statement) {
return m_statement->generate_bytecode(generator);
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
return Optional<ScopedOperand> {};
LibJS/Bytecode: Add some basic codegen for ExportStatement This is by no means complete, but at least a bunch of test-js and test262 tests start working. :^)
2023-06-24 16:07:43 +02:00
}
VERIFY(m_statement);
if (is<FunctionDeclaration>(*m_statement) || is<ClassDeclaration>(*m_statement)) {
return m_statement->generate_bytecode(generator);
}
if (is<ClassExpression>(*m_statement)) {
LibJS: Use FlyString in PropertyKey instead of DeprecatedFlyString This required dealing with *substantial* fallout.
2025-03-18 18:08:02 -05:00
auto value = TRY(generator.emit_named_evaluation_if_anonymous_function(static_cast<ClassExpression const&>(*m_statement), generator.intern_identifier("default"_fly_string))).value();
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
if (!static_cast<ClassExpression const&>(*m_statement).has_name()) {
LibJS/Bytecode: Split SetVariable into four separate instructions Instead of SetVariable having 2x2 modes for variable/lexical and initialize/set, those 4 modes are now separate instructions, which makes each instruction much less branchy.
2024-05-14 11:30:30 +02:00
generator.emit<Bytecode::Op::InitializeLexicalBinding>(
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.intern_identifier(ExportStatement::local_name_for_default),
LibJS/Bytecode: Split SetVariable into four separate instructions Instead of SetVariable having 2x2 modes for variable/lexical and initialize/set, those 4 modes are now separate instructions, which makes each instruction much less branchy.
2024-05-14 11:30:30 +02:00
value);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
}
LibJS/Bytecode: Improve export statement handling This adds support for exporting class expressions, which was previously TODO'd. We now correctly set the binding name of exports to `"*default*"` if they are unnamed. I'm not sure what the difference between the `InitializationMode` kinds is, but using `Initialize` fixes a bunch of tests. Note that some export tests (e.g. `eval-export-dflt-expr-cls-named.js`) still fail, as we don't set the "name" property of exported classes correctly. 176 new passes on test262
2023-06-28 00:53:08 +02:00
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return value;
LibJS/Bytecode: Add some basic codegen for ExportStatement This is by no means complete, but at least a bunch of test-js and test262 tests start working. :^)
2023-06-24 16:07:43 +02:00
}
// ExportDeclaration : export default AssignmentExpression ;
VERIFY(is<Expression>(*m_statement));
LibJS: Use FlyString in PropertyKey instead of DeprecatedFlyString This required dealing with *substantial* fallout.
2025-03-18 18:08:02 -05:00
auto value = TRY(generator.emit_named_evaluation_if_anonymous_function(static_cast<Expression const&>(*m_statement), generator.intern_identifier("default"_fly_string))).value();
LibJS/Bytecode: Split SetVariable into four separate instructions Instead of SetVariable having 2x2 modes for variable/lexical and initialize/set, those 4 modes are now separate instructions, which makes each instruction much less branchy.
2024-05-14 11:30:30 +02:00
generator.emit<Bytecode::Op::InitializeLexicalBinding>(
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
generator.intern_identifier(ExportStatement::local_name_for_default),
LibJS/Bytecode: Split SetVariable into four separate instructions Instead of SetVariable having 2x2 modes for variable/lexical and initialize/set, those 4 modes are now separate instructions, which makes each instruction much less branchy.
2024-05-14 11:30:30 +02:00
value);
LibJS/Bytecode: Move to a new bytecode format This patch moves us away from the accumulator-based bytecode format to one with explicit source and destination registers. The new format has multiple benefits: - ~25% faster on the Kraken and Octane benchmarks :^) - Fewer instructions to accomplish the same thing - Much easier for humans to read(!) Because this change requires a fundamental shift in how bytecode is generated, it is quite comprehensive. Main implementation mechanism: generate_bytecode() virtual function now takes an optional "preferred dst" operand, which allows callers to communicate when they have an operand that would be optimal for the result to go into. It also returns an optional "actual dst" operand, which is where the completion value (if any) of the AST node is stored after the node has "executed". One thing of note that's new: because instructions can now take locals as operands, this means we got rid of the GetLocal instruction. A side-effect of that is we have to think about the temporal deadzone (TDZ) a bit differently for locals (GetLocal would previously check for empty values and interpret that as a TDZ access and throw). We now insert special ThrowIfTDZ instructions in places where a local access may be in the TDZ, to maintain the correct behavior. There are a number of progressions and regressions from this test: A number of async generator tests have been accidentally fixed while converting the implementation to the new bytecode format. It didn't seem useful to preserve bugs in the original code when converting it. Some "does eval() return the correct completion value" tests have regressed, in particular ones related to propagating the appropriate completion after control flow statements like continue and break. These are all fairly obscure issues, and I believe we can continue working on them separately. The net test262 result is a progression though. :^)
2024-02-04 08:00:54 +01:00
return value;
LibJS/Bytecode: Add some basic codegen for ExportStatement This is by no means complete, but at least a bunch of test-js and test262 tests start working. :^)
2023-06-24 16:07:43 +02:00
}
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> ImportStatement::generate_bytecode(Bytecode::Generator&, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
LibJS/Bytecode: Handle ImportStatement in codegen There is nothing to do here at runtime as imports are handled in `Interpreter::run`.
2023-06-27 20:46:41 +02:00
{
LibJS/Bytecode: Reuse bytecode registers This patch adds a register freelist to Bytecode::Generator and switches all operands inside the generator to a new ScopedOperand type that is ref-counted and automatically frees the register when nothing uses it. This dramatically reduces the size of bytecode executable register windows, which were often in the several thousands of registers for large functions. Most functions now use less than 100 registers.
2024-05-07 21:36:56 +02:00
return Optional<ScopedOperand> {};
LibJS/Bytecode: Handle ImportStatement in codegen There is nothing to do here at runtime as imports are handled in `Interpreter::run`.
2023-06-27 20:46:41 +02:00
}
LibJS: Move AST bytecode generation virtuals to separate cpp file This will hopefully make it a bit more pleasant to edit this, as things will just get larger and larger.
2021-06-04 11:31:13 +02:00
}
Reference in a new issue Copy permalink