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.
43 lines
1.3 KiB
C++
43 lines
1.3 KiB
C++
/*
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* Copyright (c) 2020, 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/Runtime/Object.h>
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namespace JS {
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class StringObject : public Object {
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JS_OBJECT(StringObject, Object);
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JS_DECLARE_ALLOCATOR(StringObject);
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public:
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[[nodiscard]] static NonnullGCPtr<StringObject> create(Realm&, PrimitiveString&, Object& prototype);
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virtual void initialize(Realm&) override;
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virtual ~StringObject() override = default;
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PrimitiveString const& primitive_string() const { return m_string; }
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PrimitiveString& primitive_string() { return m_string; }
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protected:
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StringObject(PrimitiveString&, Object& prototype);
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private:
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virtual ThrowCompletionOr<Optional<PropertyDescriptor>> internal_get_own_property(PropertyKey const&) const override;
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virtual ThrowCompletionOr<bool> internal_define_own_property(PropertyKey const&, PropertyDescriptor const&) override;
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virtual ThrowCompletionOr<MarkedVector<Value>> internal_own_property_keys() const override;
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virtual bool is_string_object() const final { return true; }
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virtual void visit_edges(Visitor&) override;
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NonnullGCPtr<PrimitiveString> m_string;
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};
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template<>
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inline bool Object::fast_is<StringObject>() const { return is_string_object(); }
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}
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