Oilpan: Make the Node hierarchy RefCountedGarbageCollected instead of TreeShared.

Source/core/svg/SVGElementInstance.h

 /*
  * Copyright (C) 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2011 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 19 matching lines @@
 namespace Private {
 template<class GenericNode, class GenericNodeContainer>
 void addChildNodesToDeletionQueue(GenericNode*& head, GenericNode*& tail, GenericNodeContainer&);
 };
 
 class Document;
 class SVGElement;
 class SVGUseElement;
 
 // SVGElementInstance mimics Node, but without providing all its functionality
-class SVGElementInstance FINAL : public TreeShared<SVGElementInstance>, public EventTarget, public ScriptWrappable {
-    DEFINE_EVENT_TARGET_REFCOUNTING(TreeShared<SVGElementInstance>);
+class SVGElementInstance FINAL : public TreeSharedWillBeRefCountedGarbageCollected<SVGElementInstance>, public EventTarget, public ScriptWrappable {

[haraken, 2014/05/06 04:20:16]

A good news is that SVGElementInstance is going to be removed soon :)

[Mads Ager (chromium), 2014/05/06 08:26:00]

:)

+    DEFINE_EVENT_TARGET_REFCOUNTING(TreeSharedWillBeRefCountedGarbageCollected<SVGElementInstance>);
 public:
     static PassRefPtr<SVGElementInstance> create(SVGUseElement* correspondingUseElement, SVGUseElement* directUseElement, PassRefPtr<SVGElement> originalElement);
 
     virtual ~SVGElementInstance();
 
     void setParentOrShadowHostNode(SVGElementInstance* instance) { m_parentInstance = instance; }
 
     virtual const AtomicString& interfaceName() const OVERRIDE;
     virtual ExecutionContext* executionContext() const OVERRIDE;
 
@@ skipping 35 matching lines @@
     public:
         InstanceUpdateBlocker(SVGElement* targetElement);
         ~InstanceUpdateBlocker();
 
     private:
         SVGElement* m_targetElement;
     };
 
     static void invalidateAllInstancesOfElement(SVGElement*);
 
-    virtual void trace(Visitor*) { }
+    virtual void trace(Visitor*);
 
     // EventTarget API
     DECLARE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), abort);
     DECLARE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), blur);
     DECLARE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), change);
     DECLARE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), click);
     DECLARE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), contextmenu);
     DECLARE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), dblclick);
     DECLARE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), error);
     DECLARE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), focus);
@@ skipping 60 matching lines @@
 
     void setFirstChild(SVGElementInstance* child) { m_firstChild = child; }
     void setLastChild(SVGElementInstance* child) { m_lastChild = child; }
 
     void setNextSibling(SVGElementInstance* sibling) { m_nextSibling = sibling; }
     void setPreviousSibling(SVGElementInstance* sibling) { m_previousSibling = sibling; }
 
     virtual EventTargetData* eventTargetData() OVERRIDE;
     virtual EventTargetData& ensureEventTargetData() OVERRIDE;
 
-    SVGElementInstance* m_parentInstance;
+    RawPtrWillBeMember<SVGElementInstance> m_parentInstance;
 
     SVGUseElement* m_correspondingUseElement;
     SVGUseElement* m_directUseElement;
-    RefPtr<SVGElement> m_element;
-    RefPtr<SVGElement> m_shadowTreeElement;
+    RefPtrWillBeMember<SVGElement> m_element;
+    RefPtrWillBeMember<SVGElement> m_shadowTreeElement;
 
-    SVGElementInstance* m_previousSibling;
-    SVGElementInstance* m_nextSibling;
+    RawPtrWillBeMember<SVGElementInstance> m_previousSibling;
+    RawPtrWillBeMember<SVGElementInstance> m_nextSibling;
 
-    SVGElementInstance* m_firstChild;
-    SVGElementInstance* m_lastChild;
+    RawPtrWillBeMember<SVGElementInstance> m_firstChild;
+    RawPtrWillBeMember<SVGElementInstance> m_lastChild;
 };
 
 } // namespace WebCore
 
 #endif