Oilpan: move node/element rare data objects to the heap.

Source/core/dom/NodeRareData.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 13 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/dom/NodeRareData.h"
 #include "core/dom/Element.h"
+#include "core/dom/ElementRareData.h"
 #include "platform/heap/Handle.h"
 
 namespace WebCore {
 
 struct SameSizeAsNodeRareData {
     void* m_pointer[2];
-    OwnPtrWillBePersistent<NodeMutationObserverData> m_mutationObserverData;
+    OwnPtrWillBeMember<NodeMutationObserverData> m_mutationObserverData;
     unsigned m_bitfields;
 };
 
 COMPILE_ASSERT(sizeof(NodeRareData) == sizeof(SameSizeAsNodeRareData), NodeRareDataShouldStaySmall);
 
 void NodeListsNodeData::invalidateCaches(const QualifiedName* attrName)
 {
     NodeListAtomicNameCacheMap::const_iterator atomicNameCacheEnd = m_atomicNameCaches.end();
     for (NodeListAtomicNameCacheMap::const_iterator it = m_atomicNameCaches.begin(); it != atomicNameCacheEnd; ++it)
         it->value->invalidateCacheForAttribute(attrName);
 
     if (attrName)
         return;
 
     TagCollectionCacheNS::iterator tagCacheEnd = m_tagCollectionCacheNS.end();
     for (TagCollectionCacheNS::iterator it = m_tagCollectionCacheNS.begin(); it != tagCacheEnd; ++it)
         it->value->invalidateCache();
 }
 
-void NodeRareData::dispose()
+void NodeRareData::traceAfterDispatch(Visitor* visitor)
 {
-    if (m_mutationObserverData) {
-        for (unsigned i = 0; i < m_mutationObserverData->registry.size(); i++)
-            m_mutationObserverData->registry.at(i)->dispose();
-        m_mutationObserverData.clear();
-    }
+    visitor->trace(m_mutationObserverData);
+}
+
+void NodeRareData::trace(Visitor* visitor)
+{
+    if (m_isElementRareData)
+        static_cast<ElementRareData*>(this)->traceAfterDispatch(visitor);
+    else
+        traceAfterDispatch(visitor);
+}
+
+void NodeRareData::finalizeGarbageCollectedObject()
+{
+    RELEASE_ASSERT(!renderer());
+    if (m_isElementRareData)
+        static_cast<ElementRareData*>(this)->~ElementRareData();
+    else
+        this->~NodeRareData();
 }
 
 // Ensure the 10 bits reserved for the m_connectedFrameCount cannot overflow
 COMPILE_ASSERT(Page::maxNumberOfFrames < (1 << NodeRareData::ConnectedFrameCountBits), Frame_limit_should_fit_in_rare_data_count);
 
 } // namespace WebCore