Support VTune's JIT interface.

runtime/vm/code_observers.h

Index: runtime/vm/code_observers.h
diff --git a/runtime/vm/code_observers.h b/runtime/vm/code_observers.h
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+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+#ifndef VM_CODE_OBSERVERS_H_
+#define VM_CODE_OBSERVERS_H_
+
+#include "vm/globals.h"
+
+namespace dart {
+
+// Object observing code creation events. Used by external profilers and
+// debuggers to map address ranges to function names.
+class CodeObserver {
+ 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 a newly created code object with the
+  // given properties.
+  virtual void Notify(const char* name,
+                      uword base,
+                      uword prologue_offset,
+                      uword size,
+                      bool optimized) = 0;
+};
+
+
+class CodeObservers {
+ public:
+  static void InitOnce();
+
+  static void Register(CodeObserver* observer);
+
+  // Notify all active code observers about a newly created code object.
+  static void NotifyAll(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 AreActive();
+
+ private:
+  static intptr_t observers_length_;
+  static CodeObserver** observers_;
+};
+
+
+}  // namespace dart
+
+#endif  // VM_CODE_OBSERVERS_H_