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      1 /*
      2  * Copyright (C) 2012 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 #include "core/dom/NodeRareData.h"
     33 #include "core/dom/Element.h"
     34 #include "core/dom/ElementRareData.h"
     35 #include "core/page/Page.h"
     36 #include "core/rendering/RenderObject.h"
     37 #include "platform/heap/Handle.h"
     38 
     39 namespace blink {
     40 
     41 struct SameSizeAsNodeRareData {
     42     void* m_pointer[2];
     43     OwnPtrWillBeMember<NodeMutationObserverData> m_mutationObserverData;
     44     unsigned m_bitfields;
     45 };
     46 
     47 COMPILE_ASSERT(sizeof(NodeRareData) == sizeof(SameSizeAsNodeRareData), NodeRareDataShouldStaySmall);
     48 
     49 void NodeRareData::traceAfterDispatch(Visitor* visitor)
     50 {
     51 #if ENABLE(OILPAN)
     52     visitor->trace(m_renderer);
     53 #endif
     54     visitor->trace(m_mutationObserverData);
     55     // Do not keep empty NodeListsNodeData objects around.
     56     if (m_nodeLists && m_nodeLists->isEmpty())
     57         m_nodeLists.clear();
     58     else
     59         visitor->trace(m_nodeLists);
     60 }
     61 
     62 void NodeRareData::trace(Visitor* visitor)
     63 {
     64     if (m_isElementRareData)
     65         static_cast<ElementRareData*>(this)->traceAfterDispatch(visitor);
     66     else
     67         traceAfterDispatch(visitor);
     68 }
     69 
     70 void NodeRareData::finalizeGarbageCollectedObject()
     71 {
     72     RELEASE_ASSERT(!renderer());
     73     if (m_isElementRareData)
     74         static_cast<ElementRareData*>(this)->~ElementRareData();
     75     else
     76         this->~NodeRareData();
     77 }
     78 
     79 // Ensure the 10 bits reserved for the m_connectedFrameCount cannot overflow
     80 COMPILE_ASSERT(Page::maxNumberOfFrames < (1 << NodeRareData::ConnectedFrameCountBits), Frame_limit_should_fit_in_rare_data_count);
     81 
     82 } // namespace blink
     83