add ETW for V8 symbols

src/log.h

 // Copyright 2012 the V8 project authors. 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
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 59 matching lines @@
 // Collect statistical profiling information (ticks), default is off.  The
 // tick profiler requires code events, so --prof implies --log-code.
 
 // Forward declarations.
 class LogMessageBuilder;
 class Profiler;
 class Semaphore;
 class SlidingStateWindow;
 class Ticker;
 
+
 #undef LOG
 #define LOG(isolate, Call)                          \
   do {                                              \
     v8::internal::Logger* logger =                  \
         (isolate)->logger();                        \
     if (logger->is_logging())                       \
       logger->Call;                                 \
   } while (false)
 
 #define LOG_EVENTS_AND_TAGS_LIST(V)                                     \
@@ skipping 174 matching lines @@
 
   // ==== Events logged by --log-regexp ====
   // Regexp compilation and execution events.
 
   void RegExpCompileEvent(Handle<JSRegExp> regexp, bool in_cache);
 
   // Log an event reported from generated code
   void LogRuntime(Vector<const char> format, JSArray* args);
 
   bool is_logging() {
-    return logging_nesting_ > 0;
+    return logging_nesting_ > 0 || CodeAddressCallbackEnabled();
   }
 
   // Pause/Resume collection of profiling data.
   // When data collection is paused, CPU Tick events are discarded until
   // data collection is Resumed.
   void PauseProfiler();
   void ResumeProfiler();
   bool IsProfilerPaused();
 
   void LogExistingFunction(Handle<SharedFunctionInfo> shared,
@@ skipping 79 matching lines @@
   // Logs a StringEvent regardless of whether FLAG_log is true.
   void UncheckedStringEvent(const char* name, const char* value);
 
   // Logs an IntEvent regardless of whether FLAG_log is true.
   void UncheckedIntEvent(const char* name, int value);
   void UncheckedIntPtrTEvent(const char* name, intptr_t value);
 
   // Returns whether profiler's sampler is active.
   bool IsProfilerSamplerActive();
 
+  // Returns whether symbol callback is enabled.
+  bool CodeAddressCallbackEnabled();
+
   // The sampler used by the profiler and the sliding state window.
   Ticker* ticker_;
 
   // When the statistical profile is active, profiler_
   // points to a Profiler, that handles collection
   // of samples.
   Profiler* profiler_;
 
   // SlidingStateWindow instance keeping a sliding window of the most
   // recent VM states.
@@ skipping 34 matching lines @@
   Address last_address_;
   //  Logger::TickEvent(...)
   Address prev_sp_;
   Address prev_function_;
   //  Logger::MoveEventInternal(...)
   Address prev_to_;
   //  Logger::FunctionCreateEvent(...)
   Address prev_code_;
 
   friend class CpuProfiler;
+
+  friend class CodeAddressNotification;
+
+  int notified_reset_;
 };
 
 
+class CodeAddressNotification {
+public:
+    // called by host to set callbacks - null turns off callbacks
+    static void SetCodeAddressEventCallback(CodeAddressEvent cb,
+                                            bool enumExisting);
+
+    // called by v8 when a symbol map is created or changed
+    static void WriteSymbolMap(Logger* logger,
+                               CodeAddressOperation op,
+                               const void* addr1,
+                               int len,
+                               const char* symbol,
+                               Logger::LogEventsAndTags tag,
+                               const void* addr2,
+                               int line);
+
+    // called by v8 to determine if callbacks are enabled
+    static bool IsEnabled();
+
+};
+
+
 // Process wide registry of samplers.
 class SamplerRegistry : public AllStatic {
  public:
   enum State {
     HAS_NO_SAMPLERS,
     HAS_SAMPLERS,
     HAS_CPU_PROFILING_SAMPLERS
   };
 
   static void SetUp();
@@ skipping 24 matching lines @@
 // Class that extracts stack trace, used for profiling.
 class StackTracer : public AllStatic {
  public:
   static void Trace(Isolate* isolate, TickSample* sample);
 };
 
 } }  // namespace v8::internal
 
 
 #endif  // V8_LOG_H_