profiler-stats.h

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// Copyright 2020 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
 
#ifndef V8_PROFILER_PROFILER_STATS_H_
#define V8_PROFILER_PROFILER_STATS_H_
 
#include <atomic>
 
namespace v8 {
namespace internal {
 
// Stats are used to diagnose the reasons for dropped or unnattributed frames.
class ProfilerStats {
 public:
  enum Reason {
    // Reasons we fail to record a TickSample.
    kTickBufferFull,
    kIsolateNotLocked,
    // These all generate a TickSample.
    kSimulatorFillRegistersFailed,
    kNoFrameRegion,
    kInCallOrApply,
    kNoSymbolizedFrames,
    kNullPC,
 
    kNumberOfReasons,
  };
 
  static ProfilerStats* Instance() {
    static ProfilerStats stats;
    return &stats;
  }
 
  void AddReason(Reason reason);
  void Clear();
  void Print() const;
 
 private:
  ProfilerStats() = default;
  static const char* ReasonToString(Reason reason);
 
  std::atomic_int counts_[Reason::kNumberOfReasons] = {};
};
 
}  // namespace internal
}  // namespace v8
 
#endif  // V8_PROFILER_PROFILER_STATS_H_