[tracing] Adding class-wise memory statistics to blink gc memory dumps

Source/platform/heap/Visitor.h

 /*
  * Copyright (C) 2013 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 24 matching lines @@
 #include "platform/heap/GarbageCollected.h"
 #include "platform/heap/StackFrameDepth.h"
 #include "platform/heap/ThreadState.h"
 #include "wtf/Assertions.h"
 #include "wtf/Atomics.h"
 #include "wtf/Deque.h"
 #include "wtf/Forward.h"
 #include "wtf/HashMap.h"
 #include "wtf/HashTraits.h"
 #include "wtf/TypeTraits.h"
-#if ENABLE(GC_PROFILING)
 #include "wtf/InstanceCounter.h"
 #include "wtf/text/WTFString.h"
-#endif
 
 namespace blink {
 
 template<typename T> class GarbageCollected;
 class HeapObjectHeader;
 class InlinedGlobalMarkingVisitor;
 template<typename T> class TraceTrait;
 template<typename T> class TraceEagerlyTrait;
 class Visitor;
 
@@ skipping 330 matching lines @@
 
     virtual void registerWeakTable(const void*, EphemeronCallback, EphemeronCallback) = 0;
 #if ENABLE(ASSERT)
     virtual bool weakTableRegistered(const void*) = 0;
 #endif
 
     virtual bool ensureMarked(const void*) = 0;
 
     inline MarkingMode markingMode() const { return m_markingMode; }
 
+    void setHostInfo(void* object, const String& name)

[haraken, 2015/06/27 07:27:40]

Why do we need this?

+    {
+        m_hostObject = object;
+        m_hostName = name;
+    }
+
+    inline bool isGlobalMarkingVisitor() const { return m_isGlobalMarkingVisitor; }

[haraken, 2015/06/27 07:27:40]

Why do we need this?

+
 protected:
     explicit Visitor(MarkingMode markingMode)
         : m_markingMode(markingMode)
     { }
 
     virtual void registerWeakCellWithCallback(void**, WeakCallback) = 0;
 
+    void* m_hostObject;
+    String m_hostName;
+
 private:
     static Visitor* fromHelper(VisitorHelper<Visitor>* helper) { return static_cast<Visitor*>(helper); }
 
     const MarkingMode m_markingMode;
     bool m_isGlobalMarkingVisitor;
 };
 
-#if ENABLE(GC_PROFILING)
 template<typename T>
 struct TypenameStringTrait {
     static const String& get()
     {
         DEFINE_STATIC_LOCAL(String, typenameString, (WTF::extractTypeNameFromFunctionName(WTF::extractNameFunction<T>())));
         return typenameString;
     }
 };
-#endif
 
 } // namespace blink
 
 #endif // Visitor_h