Log event start and event end separately when using --log-timer-events.

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 255 matching lines @@
                        intptr_t capacity, intptr_t used);
 
   void SharedLibraryEvent(const char* library_path,
                           uintptr_t start,
                           uintptr_t end);
   void SharedLibraryEvent(const wchar_t* library_path,
                           uintptr_t start,
                           uintptr_t end);
 
   // ==== Events logged by --log-timer-events. ====
-  void TimerEvent(const char* name, int64_t start, int64_t end);
-  void ExternalSwitch(StateTag old_tag, StateTag new_tag);
+  enum StartEnd { START, END };
+
+  void TimerEvent(StartEnd se, const char* name);
 
   static void EnterExternal();
   static void LeaveExternal();
 
   class TimerEventScope {
    public:
     TimerEventScope(Isolate* isolate, const char* name)
-        : isolate_(isolate), name_(name), start_(0) {
-      if (FLAG_log_internal_timer_events) start_ = OS::Ticks();
+        : isolate_(isolate), name_(name) {
+      if (FLAG_log_internal_timer_events) LogTimerEvent(START);
     }
 
     ~TimerEventScope() {
-      if (FLAG_log_internal_timer_events) LogTimerEvent();
+      if (FLAG_log_internal_timer_events) LogTimerEvent(END);
     }
 
-    void LogTimerEvent();
+    void LogTimerEvent(StartEnd se);
 
     static const char* v8_recompile_synchronous;
     static const char* v8_recompile_parallel;
     static const char* v8_compile_full_code;
     static const char* v8_execute;
+    static const char* v8_external;
 
    private:
     Isolate* isolate_;
     const char* name_;
-    int64_t start_;
   };
 
   // ==== 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);
 
@@ skipping 152 matching lines @@
   Address last_address_;
   //  Logger::TickEvent(...)
   Address prev_sp_;
   Address prev_function_;
   //  Logger::MoveEventInternal(...)
   Address prev_to_;
   //  Logger::FunctionCreateEvent(...)
   Address prev_code_;
 
   int64_t epoch_;
-  static int64_t enter_external_;
 
   friend class CpuProfiler;
 };
 
 
 // Process wide registry of samplers.
 class SamplerRegistry : public AllStatic {
  public:
   enum State {
     HAS_NO_SAMPLERS,
@@ skipping 29 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_