mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2025-04-08 18:01:37 +00:00
116 lines
3.4 KiB
C++
116 lines
3.4 KiB
C++
/*
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* Copyright (C) 2009-2019 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "JSExportMacros.h"
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#include <cstddef>
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#include <wtf/HashTraits.h>
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#include <wtf/Noncopyable.h>
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#include <wtf/VectorTraits.h>
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namespace JSC {
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class WeakImpl;
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class WeakHandleOwner;
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// This is a free function rather than a Weak<T> member function so we can put it in Weak.cpp.
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JS_EXPORT_PRIVATE void weakClearSlowCase(WeakImpl*&);
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template<typename T> class Weak {
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WTF_MAKE_NONCOPYABLE(Weak);
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public:
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Weak() = default;
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constexpr Weak(std::nullptr_t)
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: Weak()
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{
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}
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Weak(T*, WeakHandleOwner* = nullptr, void* context = nullptr);
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bool isHashTableDeletedValue() const;
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Weak(WTF::HashTableDeletedValueType);
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constexpr bool isHashTableEmptyValue() const { return !m_impl; }
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Weak(Weak&&);
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~Weak()
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{
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clear();
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}
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inline void swap(Weak&);
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inline Weak& operator=(Weak&&);
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inline bool operator!() const;
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inline T* operator->() const;
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inline T& operator*() const;
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inline T* get() const;
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inline bool was(T*) const;
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inline explicit operator bool() const;
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inline WeakImpl* leakImpl() WARN_UNUSED_RETURN;
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WeakImpl* unsafeImpl() const { return m_impl; }
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void clear()
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{
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if (!m_impl)
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return;
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weakClearSlowCase(m_impl);
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}
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private:
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static inline WeakImpl* hashTableDeletedValue();
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WeakImpl* m_impl { nullptr };
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};
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} // namespace JSC
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namespace WTF {
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template<typename T> struct VectorTraits<JSC::Weak<T>> : SimpleClassVectorTraits {
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static constexpr bool canCompareWithMemcmp = false;
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};
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template<typename T> struct HashTraits<JSC::Weak<T>> : SimpleClassHashTraits<JSC::Weak<T>> {
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typedef JSC::Weak<T> StorageType;
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typedef std::nullptr_t EmptyValueType;
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static EmptyValueType emptyValue() { return nullptr; }
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static constexpr bool hasIsEmptyValueFunction = true;
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static bool isEmptyValue(const JSC::Weak<T>& value) { return value.isHashTableEmptyValue(); }
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typedef T* PeekType;
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static PeekType peek(const StorageType& value) { return value.get(); }
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static PeekType peek(EmptyValueType) { return PeekType(); }
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};
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} // namespace WTF
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