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.
69 lines
2.9 KiB
C++
69 lines
2.9 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2021-2022, 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 <AK/Badge.h>
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#include <AK/Optional.h>
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#include <LibJS/Heap/HeapFunction.h>
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#include <LibJS/Runtime/Completion.h>
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#include <LibJS/Runtime/FunctionObject.h>
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#include <LibJS/Runtime/PropertyKey.h>
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namespace JS {
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class NativeFunction : public FunctionObject {
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JS_OBJECT(NativeFunction, FunctionObject);
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JS_DECLARE_ALLOCATOR(NativeFunction);
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public:
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static NonnullGCPtr<NativeFunction> create(Realm&, Function<ThrowCompletionOr<Value>(VM&)> behaviour, i32 length, PropertyKey const& name, Optional<Realm*> = {}, Optional<Object*> prototype = {}, Optional<StringView> const& prefix = {});
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static NonnullGCPtr<NativeFunction> create(Realm&, DeprecatedFlyString const& name, Function<ThrowCompletionOr<Value>(VM&)>);
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virtual ~NativeFunction() 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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// Used for [[Call]] / [[Construct]]'s "...result of evaluating F in a manner that conforms to the specification of F".
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// Needs to be overridden by all NativeFunctions without an m_native_function.
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virtual ThrowCompletionOr<Value> call();
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virtual ThrowCompletionOr<NonnullGCPtr<Object>> construct(FunctionObject& new_target);
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virtual DeprecatedFlyString const& name() const override { return m_name; }
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virtual bool is_strict_mode() const override;
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virtual bool has_constructor() const override { return false; }
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virtual Realm* realm() const override { return m_realm; }
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Optional<DeprecatedFlyString> const& initial_name() const { return m_initial_name; }
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void set_initial_name(Badge<FunctionObject>, DeprecatedFlyString initial_name) { m_initial_name = move(initial_name); }
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protected:
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NativeFunction(DeprecatedFlyString name, Object& prototype);
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NativeFunction(JS::GCPtr<JS::HeapFunction<ThrowCompletionOr<Value>(VM&)>>, Object* prototype, Realm& realm);
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NativeFunction(DeprecatedFlyString name, JS::GCPtr<JS::HeapFunction<ThrowCompletionOr<Value>(VM&)>>, Object& prototype);
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explicit NativeFunction(Object& prototype);
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virtual void visit_edges(Cell::Visitor& visitor) override
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{
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Base::visit_edges(visitor);
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visitor.visit(m_native_function);
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}
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private:
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virtual bool is_native_function() const final { return true; }
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DeprecatedFlyString m_name;
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Optional<DeprecatedFlyString> m_initial_name; // [[InitialName]]
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JS::GCPtr<JS::HeapFunction<ThrowCompletionOr<Value>(VM&)>> m_native_function;
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GCPtr<Realm> m_realm;
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};
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template<>
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inline bool Object::fast_is<NativeFunction>() const { return is_native_function(); }
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}
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