mirror of
https://github.com/RGBCube/serenity
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a119b61782
This is pretty heavy and unoptimized, but it will do the trick for now. Basically, Heap now has a HashTable<HandleImpl*> and you can call JS::make_handle(T*) to construct a Handle<T> that guarantees that the pointee will always survive GC until the Handle<T> is destroyed.
57 lines
1 KiB
C++
57 lines
1 KiB
C++
#pragma once
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#include <AK/Badge.h>
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#include <AK/Noncopyable.h>
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#include <AK/RefCounted.h>
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#include <AK/RefPtr.h>
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#include <LibJS/Forward.h>
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namespace JS {
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class HandleImpl : public RefCounted<HandleImpl> {
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AK_MAKE_NONCOPYABLE(HandleImpl);
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AK_MAKE_NONMOVABLE(HandleImpl);
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public:
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~HandleImpl();
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Cell* cell() { return m_cell; }
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const Cell* cell() const { return m_cell; }
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private:
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template<class T>
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friend class Handle;
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explicit HandleImpl(Cell*);
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Cell* m_cell { nullptr };
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};
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template<class T>
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class Handle {
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public:
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Handle() {}
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static Handle create(T* cell)
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{
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return Handle(adopt(*new HandleImpl(cell)));
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}
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T* cell() { return static_cast<T*>(m_impl->cell()); }
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const T* cell() const { return static_cast<const T*>(m_impl->cell()); }
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private:
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explicit Handle(NonnullRefPtr<HandleImpl> impl)
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: m_impl(move(impl))
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{
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}
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RefPtr<HandleImpl> m_impl;
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};
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template<class T>
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inline Handle<T> make_handle(T* cell)
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{
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return Handle<T>::create(cell);
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}
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}
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