src/runtime-profiler.h

// Copyright 2012 the V8 project authors. All rights reserved.
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#ifndef V8_RUNTIME_PROFILER_H_
#define V8_RUNTIME_PROFILER_H_

#include "allocation.h"
#include "atomicops.h"

namespace v8 {
namespace internal {

class Isolate;
class JSFunction;
class Object;
class Semaphore;

class RuntimeProfiler {
 public:
  explicit RuntimeProfiler(Isolate* isolate);

  void OptimizeNow();

  void SetUp();
  void Reset();
  void TearDown();

  void NotifyICChanged() { any_ic_changed_ = true; }

  // Rate limiting support.

  void UpdateSamplesAfterScavenge();
  void RemoveDeadSamples();
  void UpdateSamplesAfterCompact(ObjectVisitor* visitor);

  void AttemptOnStackReplacement(JSFunction* function);

 private:
  static const int kSamplerWindowSize = 16;

  void Optimize(JSFunction* function, const char* reason);

  void ClearSampleBuffer();

  void ClearSampleBufferNewSpaceEntries();

  int LookupSample(JSFunction* function);

  void AddSample(JSFunction* function, int weight);

  bool CodeSizeOKForOSR(Code* shared_code);

  Isolate* isolate_;

  int sampler_threshold_;
  int sampler_threshold_size_factor_;
  int sampler_ticks_until_threshold_adjustment_;

  Object* sampler_window_[kSamplerWindowSize];
  int sampler_window_position_;
  int sampler_window_weight_[kSamplerWindowSize];

  bool any_ic_changed_;
  bool code_generated_;
};

} }  // namespace v8::internal

#endif  // V8_RUNTIME_PROFILER_H_