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4699c81fc1
This patch makes IteratorRecord an Object. Although it's not exposed to
author code, this does allow us to store it in a VM register.
Now that we can store it in a VM register, we don't need to convert it
back and forth between IteratorRecord and Object when accessing it from
bytecode.
The big win here is avoiding 3 [[Get]] accesses on every iteration step
of for..of loops. There are also a bunch of smaller efficiencies gained.
20% speed-up on this microbenchmark:
function go(a) {
for (const p of a) {
}
}
const a = [];
a.length = 1_000_000;
go(a);
45 lines
3.1 KiB
C++
45 lines
3.1 KiB
C++
/*
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* Copyright (c) 2021-2023, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <LibJS/Bytecode/IdentifierTable.h>
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#include <LibJS/Bytecode/Op.h>
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#include <LibJS/Runtime/Completion.h>
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namespace JS::Bytecode {
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ThrowCompletionOr<NonnullGCPtr<Object>> base_object_for_get(VM&, Value base_value);
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ThrowCompletionOr<Value> get_by_id(VM&, DeprecatedFlyString const& property, Value base_value, Value this_value, PropertyLookupCache&);
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ThrowCompletionOr<Value> get_by_value(VM&, Value base_value, Value property_key_value);
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ThrowCompletionOr<Value> get_global(Bytecode::Interpreter&, DeprecatedFlyString const& identifier, GlobalVariableCache&);
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ThrowCompletionOr<void> put_by_property_key(VM&, Value base, Value this_value, Value value, PropertyKey name, Op::PropertyKind kind, PropertyLookupCache* = nullptr);
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ThrowCompletionOr<Value> perform_call(Interpreter&, Value this_value, Op::CallType, Value callee, ReadonlySpan<Value> argument_values);
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ThrowCompletionOr<void> throw_if_needed_for_call(Interpreter&, Value callee, Op::CallType, Optional<StringTableIndex> const& expression_string);
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ThrowCompletionOr<Value> typeof_variable(VM&, DeprecatedFlyString const&);
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ThrowCompletionOr<void> set_variable(VM&, DeprecatedFlyString const&, Value, Op::EnvironmentMode, Op::SetVariable::InitializationMode, EnvironmentVariableCache&);
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Value new_function(VM&, FunctionExpression const&, Optional<IdentifierTableIndex> const& lhs_name, Optional<Register> const& home_object);
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ThrowCompletionOr<void> put_by_value(VM&, Value base, Value property_key_value, Value value, Op::PropertyKind);
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ThrowCompletionOr<Value> get_variable(Bytecode::Interpreter&, DeprecatedFlyString const& name, EnvironmentVariableCache&);
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struct CalleeAndThis {
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Value callee;
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Value this_value;
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};
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ThrowCompletionOr<CalleeAndThis> get_callee_and_this_from_environment(Bytecode::Interpreter&, DeprecatedFlyString const& name, EnvironmentVariableCache&);
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Value new_regexp(VM&, ParsedRegex const&, DeprecatedString const& pattern, DeprecatedString const& flags);
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MarkedVector<Value> argument_list_evaluation(VM&, Value arguments);
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ThrowCompletionOr<void> create_variable(VM&, DeprecatedFlyString const& name, Op::EnvironmentMode, bool is_global, bool is_immutable, bool is_strict);
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ThrowCompletionOr<ECMAScriptFunctionObject*> new_class(VM&, Value super_class, ClassExpression const&, Optional<IdentifierTableIndex> const& lhs_name);
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ThrowCompletionOr<NonnullGCPtr<Object>> super_call_with_argument_array(VM&, Value argument_array, bool is_synthetic);
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ThrowCompletionOr<NonnullGCPtr<Array>> iterator_to_array(VM&, Value iterator);
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ThrowCompletionOr<void> append(VM& vm, Value lhs, Value rhs, bool is_spread);
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ThrowCompletionOr<Value> delete_by_id(Bytecode::Interpreter&, Value base, IdentifierTableIndex identifier);
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ThrowCompletionOr<Value> delete_by_value(Bytecode::Interpreter&, Value base, Value property_key_value);
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ThrowCompletionOr<Value> delete_by_value_with_this(Bytecode::Interpreter&, Value base, Value property_key_value, Value this_value);
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ThrowCompletionOr<Object*> get_object_property_iterator(VM&, Value);
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}
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