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3c74dc9f4d
This patch adds two macros to declare per-type allocators: - JS_DECLARE_ALLOCATOR(TypeName) - JS_DEFINE_ALLOCATOR(TypeName) When used, they add a type-specific CellAllocator that the Heap will delegate allocation requests to. The result of this is that GC objects of the same type always end up within the same HeapBlock, drastically reducing the ability to perform type confusion attacks. It also improves HeapBlock utilization, since each block now has cells sized exactly to the type used within that block. (Previously we only had a handful of block sizes available, and most GC allocations ended up with a large amount of slack in their tails.) There is a small performance hit from this, but I'm sure we can make up for it elsewhere. Note that the old size-based allocators still exist, and we fall back to them for any type that doesn't have its own CellAllocator.
46 lines
1.8 KiB
C++
46 lines
1.8 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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JS_DECLARE_ALLOCATOR(BoundFunction);
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public:
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static ThrowCompletionOr<NonnullGCPtr<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(Value this_argument, MarkedVector<Value> arguments_list) override;
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virtual ThrowCompletionOr<NonnullGCPtr<Object>> internal_construct(MarkedVector<Value> arguments_list, FunctionObject& new_target) override;
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virtual DeprecatedFlyString const& name() const override { return m_name; }
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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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private:
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BoundFunction(Realm&, FunctionObject& target_function, Value bound_this, Vector<Value> bound_arguments, Object* prototype);
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virtual void visit_edges(Visitor&) override;
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GCPtr<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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DeprecatedFlyString m_name;
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};
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}
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