Store API callback entry address prior to entering a callback.

src/log.h

 // Copyright 2006-2008 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 73 matching lines @@
       v8::internal::Logger::Call;           \
   } while (false)
 #else
 #define LOG(Call) ((void) 0)
 #endif
 
 
 class VMState BASE_EMBEDDED {
 #ifdef ENABLE_LOGGING_AND_PROFILING
  public:
-  inline explicit VMState(StateTag state);
+  inline VMState(StateTag state);
   inline ~VMState();
 
   StateTag state() { return state_; }
+  Address external_callback() { return external_callback_; }
+  void set_external_callback(Address external_callback) {
+    external_callback_ = external_callback;
+  }
 
  private:
   bool disabled_;
   StateTag state_;
   VMState* previous_;
+  Address external_callback_;
 #else
  public:
   explicit VMState(StateTag state) {}
 #endif
 };
 
 
 #define LOG_EVENTS_AND_TAGS_LIST(V) \
   V(CODE_CREATION_EVENT,            "code-creation",          "cc")       \
   V(CODE_MOVE_EVENT,                "code-move",              "cm")       \
@@ skipping 213 matching lines @@
   // An instance of helper created if log compression is enabled.
   static CompressionHelper* compression_helper_;
 
   // Internal implementation classes with access to
   // private members.
   friend class CompressionHelper;
   friend class EventLog;
   friend class TimeLog;
   friend class Profiler;
   friend class SlidingStateWindow;
+  friend class StackTracer;
   friend class VMState;
 
   friend class LoggerTestHelper;
 
   static bool is_logging_;
 #else
   static bool is_logging() { return false; }
 #endif
 };
 
 
 // Class that extracts stack trace, used for profiling.
 class StackTracer : public AllStatic {
  public:
   static void Trace(TickSample* sample);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_LOG_H_