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ladybird/Libraries/LibJS/Bytecode/BasicBlock.cpp

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LibJS: Start fleshing out a bytecode for the JavaScript engine :^) This patch begins the work of implementing JavaScript execution in a bytecode VM instead of an AST tree-walk interpreter. It's probably quite naive, but we have to start somewhere. The basic idea is that you call Bytecode::Generator::generate() on an AST node and it hands you back a Bytecode::Block filled with instructions that can then be interpreted by a Bytecode::Interpreter. This first version only implements two instructions: Load and Add. :^) Each bytecode block has infinity registers, and the interpreter resizes its register file to fit the block being executed. Two new `js` options are added in this patch as well: `-d` will dump the generated bytecode `-b` will execute the generated bytecode Note that unless `-d` and/or `-b` are specified, none of the bytecode related stuff in LibJS runs at all. This is implemented in parallel with the existing AST interpreter. :^)
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/*
Meta: Update my e-mail address everywhere
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* Copyright (c) 2021, Andreas Kling <andreas@ladybird.org>
LibJS: Start fleshing out a bytecode for the JavaScript engine :^) This patch begins the work of implementing JavaScript execution in a bytecode VM instead of an AST tree-walk interpreter. It's probably quite naive, but we have to start somewhere. The basic idea is that you call Bytecode::Generator::generate() on an AST node and it hands you back a Bytecode::Block filled with instructions that can then be interpreted by a Bytecode::Interpreter. This first version only implements two instructions: Load and Add. :^) Each bytecode block has infinity registers, and the interpreter resizes its register file to fit the block being executed. Two new `js` options are added in this patch as well: `-d` will dump the generated bytecode `-b` will execute the generated bytecode Note that unless `-d` and/or `-b` are specified, none of the bytecode related stuff in LibJS runs at all. This is implemented in parallel with the existing AST interpreter. :^)
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*
* SPDX-License-Identifier: BSD-2-Clause
*/
LibJS: Migrate DeprecatedString to String This changes BasicBlock's constructor and create().
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#include <AK/String.h>
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.
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#include <LibJS/Bytecode/BasicBlock.h>
LibJS: Devirtualize and pack the bytecode stream :^) This patch changes the LibJS bytecode to be a stream of instructions packed one-after-the-other in contiguous memory, instead of a vector of OwnPtr<Instruction>. This should be a lot more cache-friendly. :^) Instructions are also devirtualized and instead have a type field using a new Instruction::Type enum. To iterate over a bytecode stream, one must now use Bytecode::InstructionStreamIterator.
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#include <LibJS/Bytecode/Op.h>
LibJS: Start fleshing out a bytecode for the JavaScript engine :^) This patch begins the work of implementing JavaScript execution in a bytecode VM instead of an AST tree-walk interpreter. It's probably quite naive, but we have to start somewhere. The basic idea is that you call Bytecode::Generator::generate() on an AST node and it hands you back a Bytecode::Block filled with instructions that can then be interpreted by a Bytecode::Interpreter. This first version only implements two instructions: Load and Add. :^) Each bytecode block has infinity registers, and the interpreter resizes its register file to fit the block being executed. Two new `js` options are added in this patch as well: `-d` will dump the generated bytecode `-b` will execute the generated bytecode Note that unless `-d` and/or `-b` are specified, none of the bytecode related stuff in LibJS runs at all. This is implemented in parallel with the existing AST interpreter. :^)
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namespace JS::Bytecode {
LibJS/Bytecode: Store labels as basic block index during compilation Instead of storing a BasicBlock* and forcing the size of Label to be sizeof(BasicBlock*), we now store the basic block index as a u32. This means the final version of the bytecode is able to keep labels at sizeof(u32), shrinking the size of many instructions. :^)
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NonnullOwnPtr<BasicBlock> BasicBlock::create(u32 index, String name)
LibJS: Start fleshing out a bytecode for the JavaScript engine :^) This patch begins the work of implementing JavaScript execution in a bytecode VM instead of an AST tree-walk interpreter. It's probably quite naive, but we have to start somewhere. The basic idea is that you call Bytecode::Generator::generate() on an AST node and it hands you back a Bytecode::Block filled with instructions that can then be interpreted by a Bytecode::Interpreter. This first version only implements two instructions: Load and Add. :^) Each bytecode block has infinity registers, and the interpreter resizes its register file to fit the block being executed. Two new `js` options are added in this patch as well: `-d` will dump the generated bytecode `-b` will execute the generated bytecode Note that unless `-d` and/or `-b` are specified, none of the bytecode related stuff in LibJS runs at all. This is implemented in parallel with the existing AST interpreter. :^)
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{
LibJS/Bytecode: Store labels as basic block index during compilation Instead of storing a BasicBlock* and forcing the size of Label to be sizeof(BasicBlock*), we now store the basic block index as a u32. This means the final version of the bytecode is able to keep labels at sizeof(u32), shrinking the size of many instructions. :^)
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return adopt_own(*new BasicBlock(index, move(name)));
LibJS: Start fleshing out a bytecode for the JavaScript engine :^) This patch begins the work of implementing JavaScript execution in a bytecode VM instead of an AST tree-walk interpreter. It's probably quite naive, but we have to start somewhere. The basic idea is that you call Bytecode::Generator::generate() on an AST node and it hands you back a Bytecode::Block filled with instructions that can then be interpreted by a Bytecode::Interpreter. This first version only implements two instructions: Load and Add. :^) Each bytecode block has infinity registers, and the interpreter resizes its register file to fit the block being executed. Two new `js` options are added in this patch as well: `-d` will dump the generated bytecode `-b` will execute the generated bytecode Note that unless `-d` and/or `-b` are specified, none of the bytecode related stuff in LibJS runs at all. This is implemented in parallel with the existing AST interpreter. :^)
2021-06-03 10:46:30 +02:00
}
LibJS/Bytecode: Store labels as basic block index during compilation Instead of storing a BasicBlock* and forcing the size of Label to be sizeof(BasicBlock*), we now store the basic block index as a u32. This means the final version of the bytecode is able to keep labels at sizeof(u32), shrinking the size of many instructions. :^)
2024-05-06 08:06:56 +02:00
BasicBlock::BasicBlock(u32 index, String name)
: m_index(index)
, m_name(move(name))
Revert "LibJS: Add bytecode instruction handles" This reverts commit a01bd35c67e35e9f0e33f46bb3a4431e49af1b60. This broke simple programs like: function sum(a, b) { return a + b; } console.log(sum(1, 2));
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{
}
LibJS: Stop worrying about Instruction destructors By adding static_asserts to prove that all of our generated instruction classes are trivially destructible, we can confidently remove the destructor walk in BasicBlock and save ourselves some unnecessary work.
2025-11-21 08:26:37 +01:00
BasicBlock::~BasicBlock() = default;
LibJS: Add placeholder bytecode block sealing mechanism After compiling bytecode, we should mark the memory read-only. This currently does not work because it breaks instruction destruction. I'm adding this anyway with a FIXME so we don't forget about it. :^)
2021-06-07 15:24:33 +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
void BasicBlock::grow(size_t additional_size)
Revert "LibJS: Add bytecode instruction handles" This reverts commit a01bd35c67e35e9f0e33f46bb3a4431e49af1b60. This broke simple programs like: function sum(a, b) { return a + b; } console.log(sum(1, 2));
2021-06-09 00:50:42 +02:00
{
LibJS: Pad the capacity of BasicBlock while growing it Just using Vector::resize() meant that we allocated exact capacity instead of leaving padding at the end. This patch adds a call to grow_capacity() before resize(), which ensures that we grow with the usual extra padding.
2023-09-30 09:33:11 +02:00
m_buffer.grow_capacity(m_buffer.size() + additional_size);
LibJS: Use a Vector<u8> for BasicBlock instruction storage This reduces the minimum size of a basic block from 4 KiB to 0 bytes. With this change, memory usage at the end of Speedometer is 1.2 GiB, down from 1.8 GiB.
2023-09-28 09:29:42 +02:00
m_buffer.resize(m_buffer.size() + additional_size);
Revert "LibJS: Add bytecode instruction handles" This reverts commit a01bd35c67e35e9f0e33f46bb3a4431e49af1b60. This broke simple programs like: function sum(a, b) { return a + b; } console.log(sum(1, 2));
2021-06-09 00:50:42 +02:00
}
LibJS: Start fleshing out a bytecode for the JavaScript engine :^) This patch begins the work of implementing JavaScript execution in a bytecode VM instead of an AST tree-walk interpreter. It's probably quite naive, but we have to start somewhere. The basic idea is that you call Bytecode::Generator::generate() on an AST node and it hands you back a Bytecode::Block filled with instructions that can then be interpreted by a Bytecode::Interpreter. This first version only implements two instructions: Load and Add. :^) Each bytecode block has infinity registers, and the interpreter resizes its register file to fit the block being executed. Two new `js` options are added in this patch as well: `-d` will dump the generated bytecode `-b` will execute the generated bytecode Note that unless `-d` and/or `-b` are specified, none of the bytecode related stuff in LibJS runs at all. This is implemented in parallel with the existing AST interpreter. :^)
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}
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