ASSERT on renderer lifecycle

Source/core/rendering/RenderObject.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. 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
@@ skipping 1084 matching lines @@
 
     Color selectionColor(int colorProperty) const;
 
     void removeShapeImageClient(ShapeValue*);
 
 #ifndef NDEBUG
     void checkBlockPositionedObjectsNeedLayout();
 #endif
     const char* invalidationReasonToString(InvalidationReason) const;
 
+    static bool isAllowedToModifyRenderTreeStructure(Document&);
+
     RefPtr<RenderStyle> m_style;
 
     Node* m_node;
 
     RenderObject* m_parent;
     RenderObject* m_previous;
     RenderObject* m_next;
 
 #ifndef NDEBUG
     unsigned m_hasAXObject             : 1;
@@ skipping 153 matching lines @@
     static bool s_affectsParentBlock;
 
     // This stores the repaint rect from the previous layout.
     LayoutRect m_previousRepaintRect;
 
     // This stores the position in the repaint container's coordinate.
     // It is used to detect renderer shifts that forces a full invalidation.
     LayoutPoint m_previousPositionFromRepaintContainer;
 };
 
+// FIXME: remove this once the render object lifecycle ASSERTS are no longer hit.
+class DeprecatedDisableModifyRenderTreeStructureAsserts {
+    WTF_MAKE_NONCOPYABLE(DeprecatedDisableModifyRenderTreeStructureAsserts);
+public:
+    DeprecatedDisableModifyRenderTreeStructureAsserts();
+
+    static bool canModifyRenderTreeStateInAnyState();
+
+private:
+    TemporaryChange<bool> m_disabler;
+};
+
 // Allow equality comparisons of RenderObject's by reference or pointer, interchangeably.
 inline bool operator==(const RenderObject& a, const RenderObject& b) { return &a == &b; }
 inline bool operator==(const RenderObject& a, const RenderObject* b) { return &a == b; }
 inline bool operator==(const RenderObject* a, const RenderObject& b) { return a == &b; }
 inline bool operator!=(const RenderObject& a, const RenderObject& b) { return !(a == b); }
 inline bool operator!=(const RenderObject& a, const RenderObject* b) { return !(a == b); }
 inline bool operator!=(const RenderObject* a, const RenderObject& b) { return !(a == b); }
 
 inline bool RenderObject::documentBeingDestroyed() const
 {
@@ skipping 173 matching lines @@
 void showTree(const WebCore::RenderObject*);
 void showLineTree(const WebCore::RenderObject*);
 void showRenderTree(const WebCore::RenderObject* object1);
 // We don't make object2 an optional parameter so that showRenderTree
 // can be called from gdb easily.
 void showRenderTree(const WebCore::RenderObject* object1, const WebCore::RenderObject* object2);
 
 #endif
 
 #endif // RenderObject_h