Add a new API V8::SetJitCodeEventHandler to push code name and location to users such as profilers.

src/code-events.h

 // Copyright 2012 the V8 project authors. All rights reserved.
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 // modification, are permitted provided that the following conditions are
 // met:
 //
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 //       notice, this list of conditions and the following disclaimer.
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-#ifndef V8_PLATFORM_POSIX_H_
-#define V8_PLATFORM_POSIX_H_
+#ifndef V8_CODE_EVENTS_H_
+#define V8_CODE_EVENTS_H_
+
+#include "allocation.h"
 
 namespace v8 {
 namespace internal {
 
-// Used by platform implementation files during OS::PostSetUp().
-void POSIXPostSetUp();
+class CompilationInfo;
+
+class CodeEvents : public AllStatic {
+ public:
+  static bool is_active() {
+    return event_handler_ != NULL;
+  }
+
+  static void set_handler(JitCodeEventHandler event_handler) {
+    event_handler_ = event_handler;
+  }
+
+  // Code added notifications.
+  static void AddCode(const char* name,
+                      Code* code,
+                      Script* script,
+                      CompilationInfo* info);
+  // TODO(siggi): Remove this variant.
+  static void AddCode(Handle<String> name,
+                      Handle<Script> script,
+                      Handle<Code> code,
+                      CompilationInfo* info);
+  static void AddCode(String* name, Code* code);
+  // TODO(siggi): Fold these two variants.
+  static void AddCode(const char* name, Code* code);
+  static void AddCode(Code* code);
+
+  // Code moved notification.
+  static void MoveCode(Address src, Address dst);
+
+  // Code removed notification.
+  static void RemoveCode(Code* code);
+
+ private:
+  static JitCodeEventHandler event_handler_;
+};
+
+#define JIT_CODE_EVENT(action) \
+  do { if (CodeEvents::is_active()) CodeEvents::action; } while(0)
 
 } }  // namespace v8::internal
 
-#endif  // V8_PLATFORM_POSIX_H_
+#endif  // V8_CODE_EVENTS_H_