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4d92c4d71a
Every function call allocates an ExecutionContext with a trailing array of Values for registers, locals, constants, and arguments. Previously, the constructor would initialize all slots to js_special_empty_value(), but constant slots were then immediately overwritten by the interpreter copying in values from the Executable before execution began. To eliminate this redundant initialization, we rearrange the layout from [registers | constants | locals] to [registers | locals | constants]. This groups registers and locals together at the front, allowing us to initialize only those slots while leaving constant slots uninitialized until they're populated with their actual values. This reduces the per-call initialization cost from O(registers + locals + constants) to O(registers + locals). Also tightens up the types involved (size_t -> u32) and adds VERIFYs to guard against overflow when computing the combined slot counts, and to ensure the total fits within the 29-bit operand index field.
51 lines
2 KiB
C++
51 lines
2 KiB
C++
/*
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* Copyright (c) 2020, Jack Karamanian <karamanian.jack@gmail.com>
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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/Runtime/Completion.h>
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#include <LibJS/Runtime/FunctionObject.h>
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namespace JS {
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class BoundFunction final : public FunctionObject {
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JS_OBJECT(BoundFunction, FunctionObject);
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GC_DECLARE_ALLOCATOR(BoundFunction);
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public:
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static ThrowCompletionOr<GC::Ref<BoundFunction>> create(Realm&, FunctionObject& target_function, Value bound_this, Vector<Value> bound_arguments);
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virtual ~BoundFunction() override = default;
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virtual ThrowCompletionOr<Value> internal_call(ExecutionContext&, Value this_argument) override;
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virtual ThrowCompletionOr<GC::Ref<Object>> internal_construct(ExecutionContext& arguments_list, FunctionObject& new_target) override;
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virtual bool is_strict_mode() const override { return m_bound_target_function->is_strict_mode(); }
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virtual bool has_constructor() const override { return m_bound_target_function->has_constructor(); }
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FunctionObject& bound_target_function() const { return *m_bound_target_function; }
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Value bound_this() const { return m_bound_this; }
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Vector<Value> const& bound_arguments() const { return m_bound_arguments; }
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virtual Utf16String name_for_call_stack() const override;
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private:
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BoundFunction(Realm&, FunctionObject& target_function, Value bound_this, Vector<Value> bound_arguments, Object* prototype);
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ThrowCompletionOr<void> get_stack_frame_size(size_t& registers_and_locals_count, size_t& constants_count, size_t& argument_count) override;
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virtual void visit_edges(Visitor&) override;
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virtual bool is_bound_function() const final { return true; }
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GC::Ptr<FunctionObject> m_bound_target_function; // [[BoundTargetFunction]]
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Value m_bound_this; // [[BoundThis]]
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Vector<Value> m_bound_arguments; // [[BoundArguments]]
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};
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template<>
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inline bool Object::fast_is<BoundFunction>() const { return is_bound_function(); }
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}
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