Oilpan: Make the Node hierarchy RefCountedGarbageCollected instead of TreeShared.

Source/core/dom/Node.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 256 matching lines @@
 #endif
 
     if (hasRareData())
         clearRareData();
 
     RELEASE_ASSERT(!renderer());
 
 #if !ENABLE(OILPAN)
     if (!isContainerNode())
         willBeDeletedFromDocument();
-#endif
 
     if (m_previous)
         m_previous->setNextSibling(0);
     if (m_next)
         m_next->setPreviousSibling(0);
 
-#if !ENABLE(OILPAN)
     if (m_treeScope)
         m_treeScope->guardDeref();
 #endif
 
     InspectorCounters::decrementCounter(InspectorCounters::NodeCounter);
 
     if (getFlag(HasWeakReferencesFlag))
         WeakNodeMap::notifyNodeDestroyed(this);
 }
 
@@ skipping 2073 matching lines @@
     return isContentEditable(UserSelectAllIsAlwaysNonEditable) || hasEventListeners(EventTypeNames::mouseup) || hasEventListeners(EventTypeNames::mousedown) || hasEventListeners(EventTypeNames::click) || hasEventListeners(EventTypeNames::DOMActivate);
 }
 
 bool Node::willRespondToTouchEvents()
 {
     if (isDisabledFormControl(this))
         return false;
     return hasEventListeners(EventTypeNames::touchstart) || hasEventListeners(EventTypeNames::touchmove) || hasEventListeners(EventTypeNames::touchcancel) || hasEventListeners(EventTypeNames::touchend);
 }
 
+#if !ENABLE(OILPAN)
 // This is here for inlining
-#if ENABLE(OILPAN)
-inline void TreeScope::removedLastRefToScope()
-{
-    dispose();
-}
-#else
 inline void TreeScope::removedLastRefToScope()
 {
     ASSERT_WITH_SECURITY_IMPLICATION(!deletionHasBegun());
     if (m_guardRefCount) {
         // If removing a child removes the last self-only ref, we don't
         // want the scope to be destructed until after
         // removeDetachedChildren returns, so we guard ourselves with an
         // extra self-only ref.
         guardRef();
         dispose();
 #if !ASSERT_DISABLED
         // We need to do this right now since guardDeref() can delete this.
         rootNode().m_inRemovedLastRefFunction = false;
 #endif
         guardDeref();
     } else {
 #if !ASSERT_DISABLED
         rootNode().m_inRemovedLastRefFunction = false;
 #endif
 #if SECURITY_ASSERT_ENABLED
         beginDeletion();
 #endif
         delete this;
     }
 }
 #endif
 
+#if !ENABLE(OILPAN)
 // It's important not to inline removedLastRef, because we don't want to inline the code to
 // delete a Node at each deref call site.
 void Node::removedLastRef()
 {
     // An explicit check for Document here is better than a virtual function since it is
     // faster for non-Document nodes, and because the call to removedLastRef that is inlined
     // at all deref call sites is smaller if it's a non-virtual function.
     if (isTreeScope()) {
         treeScope().removedLastRefToScope();
         return;
     }
 
-#if !ENABLE(OILPAN)
 #if SECURITY_ASSERT_ENABLED
     m_deletionHasBegun = true;
 #endif
     delete this;
+}
 #endif
-}
 
 unsigned Node::connectedSubframeCount() const
 {
     return hasRareData() ? rareData()->connectedSubframeCount() : 0;
 }
 
 void Node::incrementConnectedSubframeCount(unsigned amount)
 {
     ASSERT(isContainerNode());
     ensureRareData().incrementConnectedSubframeCount(amount);
@@ skipping 123 matching lines @@
     ASSERT(isHTMLElement() || isSVGElement());
     setFlag(CustomElementFlag);
     setFlag(newState == Upgraded, CustomElementUpgradedFlag);
 
     if (oldState == NotCustomElement || newState == Upgraded)
         setNeedsStyleRecalc(SubtreeStyleChange); // :unresolved has changed
 }
 
 void Node::trace(Visitor* visitor)
 {
+    visitor->trace(m_parentOrShadowHostNode);
+    visitor->trace(m_previous);
+    visitor->trace(m_next);
     visitor->trace(m_treeScope);
 }
 
 } // namespace WebCore
 
 #ifndef NDEBUG
 
 void showNode(const WebCore::Node* node)
 {
     if (node)
         node->showNode("");
 }
 
 void showTree(const WebCore::Node* node)
 {
     if (node)
         node->showTreeForThis();
 }
 
 void showNodePath(const WebCore::Node* node)
 {
     if (node)
         node->showNodePathForThis();
 }
 
 #endif