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

Source/wtf/InstanceCounter.cpp

 /*
  * 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 17 matching lines @@
 
 #include "wtf/HashMap.h"
 #include "wtf/StdLibExtras.h"
 #include "wtf/ThreadingPrimitives.h"
 #include "wtf/text/StringBuilder.h"
 #include "wtf/text/StringHash.h"
 #include "wtf/text/WTFString.h"
 
 namespace WTF {
 
-#if ENABLE(INSTANCE_COUNTER) || ENABLE(GC_PROFILING)
-
 #if COMPILER(CLANG)
 const size_t extractNameFunctionPrefixLength = sizeof("const char *WTF::extractNameFunction() [T = ") - 1;
 const size_t extractNameFunctionPostfixLength = sizeof("]") - 1;
 #elif COMPILER(GCC)
 const size_t extractNameFunctionPrefixLength = sizeof("const char* WTF::extractNameFunction() [with T = ") - 1;
 const size_t extractNameFunctionPostfixLength = sizeof("]") - 1;
 #elif COMPILER(MSVC)
 const size_t extractNameFunctionPrefixLength = sizeof("const char *__cdecl WTF::extractNameFunction<class ") - 1;
 const size_t extractNameFunctionPostfixLength = sizeof(">(void)") - 1;
 #else
 #warning "Extracting typename is supported only in compiler GCC, CLANG and MSVC at this moment"
 #endif
 
 // This function is used to stringify a typename T without using RTTI.
 // The result of extractNameFunction<T>() is given as |funcName|. |extractTypeNameFromFunctionName| then extracts a typename string from |funcName|.
 String extractTypeNameFromFunctionName(const char* funcName)
 {
 #if COMPILER(CLANG) || COMPILER(GCC) || COMPILER(MSVC)
     size_t funcNameLength = strlen(funcName);
     ASSERT(funcNameLength > extractNameFunctionPrefixLength + extractNameFunctionPostfixLength);
 
     const char* funcNameWithoutPrefix = funcName + extractNameFunctionPrefixLength;
     return String(funcNameWithoutPrefix, funcNameLength - extractNameFunctionPrefixLength - extractNameFunctionPostfixLength);
 #else
     return String("unknown");
 #endif
 }
 
+#if ENABLE(INSTANCE_COUNTER) || ENABLE(GC_PROFILING)
+
 class InstanceCounter {
 public:
     void incrementInstanceCount(const String& instanceName, void* ptr);
     void decrementInstanceCount(const String& instanceName, void* ptr);
     String dump();
 
     static InstanceCounter* instance()
     {
         DEFINE_STATIC_LOCAL(InstanceCounter, self, ());
         return &self;
@@ skipping 67 matching lines @@
 #else
 
 String dumpRefCountedInstanceCounts()
 {
     return String("{}");
 }
 
 #endif // ENABLE(INSTANCE_COUNTER) || ENABLE(GC_PROFILING)
 
 } // namespace WTF