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https://github.com/flutter/flutter.git
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121 lines
3.2 KiB
C++
121 lines
3.2 KiB
C++
/*
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* Copyright (C) 2006, 2007, 2009, 2010, 2012 Apple Inc. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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*/
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#ifndef SKY_ENGINE_CORE_DOM_TREESHARED_H_
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#define SKY_ENGINE_CORE_DOM_TREESHARED_H_
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#include "sky/engine/public/platform/WebPrivatePtr.h"
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#include "sky/engine/wtf/Assertions.h"
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#include "sky/engine/wtf/MainThread.h"
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#include "sky/engine/wtf/Noncopyable.h"
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namespace blink {
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#if ENABLE(SECURITY_ASSERT)
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template<typename NodeType> class TreeShared;
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template<typename NodeType> void adopted(TreeShared<NodeType>*);
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#endif
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template<typename NodeType> class TreeShared {
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WTF_MAKE_NONCOPYABLE(TreeShared);
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protected:
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TreeShared()
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: m_refCount(1)
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#if ENABLE(SECURITY_ASSERT)
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, m_deletionHasBegun(false)
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#if ENABLE(ASSERT)
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, m_inRemovedLastRefFunction(false)
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, m_adoptionIsRequired(true)
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#endif
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#endif
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{
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ASSERT(isMainThread());
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}
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~TreeShared()
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{
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ASSERT(isMainThread());
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ASSERT(!m_refCount);
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ASSERT_WITH_SECURITY_IMPLICATION(m_deletionHasBegun);
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ASSERT(!m_adoptionIsRequired);
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}
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public:
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void ref()
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{
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ASSERT(isMainThread());
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ASSERT_WITH_SECURITY_IMPLICATION(!m_deletionHasBegun);
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ASSERT(!m_inRemovedLastRefFunction);
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ASSERT(!m_adoptionIsRequired);
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++m_refCount;
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}
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void deref()
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{
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ASSERT(isMainThread());
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ASSERT(m_refCount > 0);
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ASSERT_WITH_SECURITY_IMPLICATION(!m_deletionHasBegun);
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ASSERT(!m_inRemovedLastRefFunction);
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ASSERT(!m_adoptionIsRequired);
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NodeType* thisNode = static_cast<NodeType*>(this);
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if (!--m_refCount && !thisNode->hasTreeSharedParent()) {
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#if ENABLE(ASSERT)
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m_inRemovedLastRefFunction = true;
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#endif
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thisNode->removedLastRef();
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}
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}
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int refCount() const { return m_refCount; }
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private:
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int m_refCount;
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#if ENABLE(SECURITY_ASSERT)
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public:
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bool m_deletionHasBegun;
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#if ENABLE(ASSERT)
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bool m_inRemovedLastRefFunction;
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private:
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friend void adopted<>(TreeShared<NodeType>*);
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bool m_adoptionIsRequired;
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#endif
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#endif
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};
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#if ENABLE(SECURITY_ASSERT)
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template<typename NodeType> void adopted(TreeShared<NodeType>* object)
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{
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if (!object)
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return;
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ASSERT_WITH_SECURITY_IMPLICATION(!object->m_deletionHasBegun);
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#if ENABLE(ASSERT)
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ASSERT(!object->m_inRemovedLastRefFunction);
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object->m_adoptionIsRequired = false;
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#endif
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}
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#endif
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}
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#endif // SKY_ENGINE_CORE_DOM_TREESHARED_H_
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