src/runtime-profiler.h

// Copyright 2010 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
//       copyright notice, this list of conditions and the following
//       disclaimer in the documentation and/or other materials provided
//       with the distribution.
//     * Neither the name of Google Inc. nor the names of its
//       contributors may be used to endorse or promote products derived
//       from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#ifndef V8_RUNTIME_PROFILER_H_
#define V8_RUNTIME_PROFILER_H_

#include "v8.h"
#include "allocation.h"

namespace v8 {
namespace internal {

class RuntimeProfiler : public AllStatic {
 public:
  static bool IsEnabled() { return V8::UseCrankshaft() && FLAG_opt; }

  static void OptimizeNow();
  static void OptimizeSoon(JSFunction* function);

  static void NotifyTick();

  static void Setup();
  static void Reset();
  static void TearDown();

  static void MarkCompactPrologue(bool is_compacting);
  static Object** SamplerWindowAddress();
  static int SamplerWindowSize();
};


// Rate limiter intended to be used in the profiler thread.
class RuntimeProfilerRateLimiter BASE_EMBEDDED {
 public:
  RuntimeProfilerRateLimiter() : non_js_ticks_(0) { }

  // Suspends the current thread when not executing JavaScript to
  // minimize CPU usage. Returns whether this thread was suspended
  // (and so might have to check whether profiling is still active.)
  //
  // Does nothing when runtime profiling is not enabled.
  bool SuspendIfNecessary();

 private:
  int non_js_ticks_;

  DISALLOW_COPY_AND_ASSIGN(RuntimeProfilerRateLimiter);
};

} }  // namespace v8::internal

#endif  // V8_RUNTIME_PROFILER_H_