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 RUNTIME_VM_CODE_OBSERVERS_H_
#define RUNTIME_VM_CODE_OBSERVERS_H_
 
#include "vm/allocation.h"
#include "vm/globals.h"
 
#include "include/dart_api.h"
 
#if !defined(PRODUCT)
namespace dart {
 
class CodeComments;
 
// Object observing code creation events. Used by external profilers and
// debuggers to map address ranges to function names.
class CodeObserver {
 public:
  CodeObserver() {}
 
  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,
                      const CodeComments* comments) = 0;
 
 private:
  DISALLOW_COPY_AND_ASSIGN(CodeObserver);
};
 
class Mutex;
 
class CodeObservers : public AllStatic {
 public:
  static void Init();
 
  static void RegisterExternal(Dart_CodeObserver observer);
 
  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,
                        const CodeComments* comments);
 
  // Returns true if there is at least one active code observer.
  static bool AreActive();
 
  static void Cleanup();
 
  static Mutex* mutex() { return mutex_; }
 
 private:
  static Mutex* mutex_;
  static intptr_t observers_length_;
  static CodeObserver** observers_;
};
 
}  // namespace dart
#endif  // !defined(PRODUCT)
 
#endif  // RUNTIME_VM_CODE_OBSERVERS_H_