[ Do not submit ] Prototype for invalidation analysis

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 78 matching lines @@
 #include "core/svg/graphics/SVGImage.h"
 #include "platform/Partitions.h"
 #include "platform/TraceEvent.h"
 #include "platform/TracedValue.h"
 #include "wtf/HashSet.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/RefCountedLeakCounter.h"
 #include "wtf/Vector.h"
 #include "wtf/text/CString.h"
 #include "wtf/text/StringBuilder.h"
+#include <inttypes.h>
 
 namespace blink {
 
 using namespace HTMLNames;
 
 struct SameSizeAsNode : NODE_BASE_CLASSES {
     uint32_t m_nodeFlags;
     void* m_pointer[5];
 };
 
@@ skipping 650 matching lines @@
     m_nodeFlags = (m_nodeFlags & ~StyleChangeMask) | changeType;
 }
 
 void Node::markAncestorsWithChildNeedsStyleRecalc()
 {
     for (ContainerNode* p = parentOrShadowHostNode(); p && !p->childNeedsStyleRecalc(); p = p->parentOrShadowHostNode())
         p->setChildNeedsStyleRecalc();
     document().scheduleRenderTreeUpdateIfNeeded();
 }
 
+PassRefPtr<TraceEvent::ConvertableToTraceFormat> jsonObjectForTracedStyleInvalidation(const Node* node, const StyleChangeType styleChangeType)
+{
+    RefPtr<TracedValue> value = TracedValue::create();
+    value->setString("root_node", node->debugName());
+    LocalFrame* frame = node->document().frame();
+    value->setString("frame", String::format("0x%" PRIx64, static_cast<uint64>(reinterpret_cast<intptr_t>(frame))));
+    switch(styleChangeType) {
+        case(NoStyleChange): value->setString("styleChange", "NoStyleChange"); break;
+        case(LocalStyleChange): value->setString("styleChange", "LocalStyleChange"); break;
+        case(SubtreeStyleChange): value->setString("styleChange", "SubtreeStyleChange"); break;
+        case(NeedsReattachStyleChange): value->setString("styleChange", "NeedsReattachStyleChange"); break;
+        default: value->setString("styleChange", "Unknown");
+    }
+    return value;
+}
+
 void Node::setNeedsStyleRecalc(StyleChangeType changeType)
 {
     ASSERT(changeType != NoStyleChange);
     if (!inActiveDocument())
         return;
 
     StyleChangeType existingChangeType = styleChangeType();
     if (changeType > existingChangeType) {
         setStyleChange(changeType);
         if (changeType >= SubtreeStyleChange)
             traceStyleChangeIfNeeded(changeType);
+        TRACE_EVENT_INSTANT1(TRACE_DISABLED_BY_DEFAULT("devtools.timeline.invalidations"), "Invalidation", "data", jsonObjectForTracedStyleInvalidation(this, changeType));
     }
 
     if (existingChangeType == NoStyleChange)
         markAncestorsWithChildNeedsStyleRecalc();
 
     if (isElementNode() && hasRareData())
         toElement(*this).setAnimationStyleChange(false);
 }
 
 void Node::clearNeedsStyleRecalc()
@@ skipping 1700 matching lines @@
         node->showTreeForThis();
 }
 
 void showNodePath(const blink::Node* node)
 {
     if (node)
         node->showNodePathForThis();
 }
 
 #endif