mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2024-11-26 21:50:53 +00:00
115 lines
3.3 KiB
C++
115 lines
3.3 KiB
C++
/*
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* Copyright (C) 2012 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 "JSCJSValue.h"
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namespace JSC {
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class WeakHandleOwner;
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class WeakImpl {
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public:
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enum State {
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Live = 0x0,
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Dead = 0x1,
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Finalized = 0x2,
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Deallocated = 0x3
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};
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enum {
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StateMask = 0x3
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};
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WeakImpl();
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WeakImpl(JSValue, WeakHandleOwner*, void* context);
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State state();
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void setState(State);
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const JSValue& jsValue();
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static ptrdiff_t offsetOfJSValue() { return OBJECT_OFFSETOF(WeakImpl, m_jsValue); }
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WeakHandleOwner* weakHandleOwner();
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static ptrdiff_t offsetOfWeakHandleOwner() { return OBJECT_OFFSETOF(WeakImpl, m_weakHandleOwner); }
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void* context();
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static WeakImpl* asWeakImpl(JSValue*);
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private:
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const JSValue m_jsValue;
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WeakHandleOwner* m_weakHandleOwner;
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void* m_context;
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};
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inline WeakImpl::WeakImpl()
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: m_weakHandleOwner(nullptr)
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, m_context(nullptr)
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{
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setState(Deallocated);
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}
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inline WeakImpl::WeakImpl(JSValue jsValue, WeakHandleOwner* weakHandleOwner, void* context)
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: m_jsValue(jsValue)
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, m_weakHandleOwner(weakHandleOwner)
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, m_context(context)
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{
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ASSERT(state() == Live);
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ASSERT(m_jsValue && m_jsValue.isCell());
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}
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inline WeakImpl::State WeakImpl::state()
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{
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return static_cast<State>(reinterpret_cast<uintptr_t>(m_weakHandleOwner) & StateMask);
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}
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inline void WeakImpl::setState(WeakImpl::State state)
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{
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ASSERT(state >= this->state());
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m_weakHandleOwner = reinterpret_cast<WeakHandleOwner*>((reinterpret_cast<uintptr_t>(m_weakHandleOwner) & ~StateMask) | state);
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}
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inline const JSValue& WeakImpl::jsValue()
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{
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return m_jsValue;
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}
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inline WeakHandleOwner* WeakImpl::weakHandleOwner()
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{
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return reinterpret_cast<WeakHandleOwner*>((reinterpret_cast<uintptr_t>(m_weakHandleOwner) & ~StateMask));
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}
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inline void* WeakImpl::context()
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{
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return m_context;
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}
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inline WeakImpl* WeakImpl::asWeakImpl(JSValue* slot)
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{
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return reinterpret_cast_ptr<WeakImpl*>(reinterpret_cast_ptr<char*>(slot) + OBJECT_OFFSETOF(WeakImpl, m_jsValue));
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}
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} // namespace JSC
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