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.
65 lines
2.8 KiB
C++
65 lines
2.8 KiB
C++
/*
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* Copyright (c) 2020, Matthew Olsson <mattco@serenityos.org>
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* Copyright (c) 2021, Linus Groh <linusg@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/Completion.h>
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#include <LibJS/Runtime/FunctionObject.h>
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namespace JS {
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class ProxyObject final : public FunctionObject {
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JS_OBJECT(ProxyObject, FunctionObject);
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JS_DECLARE_ALLOCATOR(ProxyObject);
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public:
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static NonnullGCPtr<ProxyObject> create(Realm&, Object& target, Object& handler);
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virtual ~ProxyObject() override = default;
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virtual DeprecatedFlyString const& name() const override;
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virtual bool has_constructor() const override;
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Object const& target() const { return m_target; }
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Object const& handler() const { return m_handler; }
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bool is_revoked() const { return m_is_revoked; }
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void revoke() { m_is_revoked = true; }
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// 10.5 Proxy Object Internal Methods and Internal Slots, https://tc39.es/ecma262/#sec-proxy-object-internal-methods-and-internal-slots
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virtual ThrowCompletionOr<Object*> internal_get_prototype_of() const override;
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virtual ThrowCompletionOr<bool> internal_set_prototype_of(Object* prototype) override;
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virtual ThrowCompletionOr<bool> internal_is_extensible() const override;
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virtual ThrowCompletionOr<bool> internal_prevent_extensions() override;
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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<bool> internal_has_property(PropertyKey const&) const override;
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virtual ThrowCompletionOr<Value> internal_get(PropertyKey const&, Value receiver, CacheablePropertyMetadata*) const override;
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virtual ThrowCompletionOr<bool> internal_set(PropertyKey const&, Value value, Value receiver, CacheablePropertyMetadata*) override;
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virtual ThrowCompletionOr<bool> internal_delete(PropertyKey const&) override;
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virtual ThrowCompletionOr<MarkedVector<Value>> internal_own_property_keys() const override;
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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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private:
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ProxyObject(Object& target, Object& handler, Object& prototype);
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virtual void visit_edges(Visitor&) override;
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virtual bool is_function() const override { return m_target->is_function(); }
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virtual bool is_proxy_object() const final { return true; }
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NonnullGCPtr<Object> m_target;
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NonnullGCPtr<Object> m_handler;
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bool m_is_revoked { false };
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};
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template<>
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inline bool Object::fast_is<ProxyObject>() const { return is_proxy_object(); }
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}
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