Support VTune's JIT interface.

runtime/vm/dart.h

Index: runtime/vm/dart.h
diff --git a/runtime/vm/dart.h b/runtime/vm/dart.h
index 585cdddf982a15b9212ca2381fc0dc8d96ec6159..6344f501faf4898f642c61ad4a3508c6fd83b621 100644
--- a/runtime/vm/dart.h
+++ b/runtime/vm/dart.h
@@ -16,6 +16,25 @@ class Isolate;
 class RawError;
 class ThreadPool;
 
+// Object observing code creation events. Used by external profilers and
+// debuggers to map address ranges to function names.
+class CodeObserver {

[Ivan Posva, 2012/11/27 09:11:20]

I am not certain whether this belongs into this file or whether we should put it
into its own file code_observer.h and code_observer.cc. Can be split at a
different CL.

[Vyacheslav Egorov (Google), 2012/11/27 16:26:12]

Moved all code observers related code to a separate file code_observers.(cc|h).

+ public:
+  virtual ~CodeObserver() { }
+
+  // Returns true if this observer is active and should be notified
+  // about newly created code objects.
+  virtual bool IsActive() const = 0;
+
+  // Notify code observer about newly created code object with the

[Ivan Posva, 2012/11/27 09:11:20]

about a newly

[Vyacheslav Egorov (Google), 2012/11/27 16:26:12]

Done.

+  // given properties.
+  virtual void Notify(const char* name,
+                      uword base,
+                      uword prologue_offset,
+                      uword size,
+                      bool optimized) = 0;
+};
+
 class Dart : public AllStatic {
  public:
   static const char* InitOnce(Dart_IsolateCreateCallback create,
@@ -48,12 +67,29 @@ class Dart : public AllStatic {
     return flow_graph_writer_;
   }
 
+  static void RegisterCodeObserver(CodeObserver* observer);
+
+  // Notify all active code observers about newly created code object.
+  static void NotifyCodeObservers(const char* name,
+                                  uword base,
+                                  uword prologue_offset,
+                                  uword size,
+                                  bool optimized);
+
+  // Returns true if there is at least one active code observer.
+  static bool AreCodeObserversActive();
+
  private:
+  static void RegisterDefaultCodeObservers();
+
   static Isolate* vm_isolate_;
   static ThreadPool* thread_pool_;
   static Dart_FileWriterFunction perf_events_writer_;
   static DebugInfo* pprof_symbol_generator_;
   static Dart_FileWriterFunction flow_graph_writer_;
+
+  static intptr_t code_observers_length_;
+  static CodeObserver** code_observers_;
 };
 
 }  // namespace dart