Keep only base/extractor.[cc|h].

base/timer.h

-// Copyright 2003-2009 Google Inc.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-// ========================================================================
-//
-// Timing
-
-#ifndef OMAHA_BASE_TIMER_H_
-#define OMAHA_BASE_TIMER_H_
-
-#include "omaha/base/time.h"
-
-namespace omaha {
-
-// Low resolution timer which can be used to time loops. The resolution depends
-// on the platform and can be expected to be about 10 ms on Windows 2000 and up.
-class LowResTimer {
- public:
-  explicit LowResTimer(bool running);
-  ~LowResTimer();
-
-  // LowResTimer keeps track of elapsed time, which can consist of multiple
-  // Start()-Stop() intervals.
-  void Start();
-
-  // Returns time between Start and Stop call and increments the time elapsed.
-  uint32 Stop();
-  void Reset();
-
-  // Return time in seconds, milliseconds.
-  double GetSeconds() const;
-  uint32 GetMilliseconds() const;
-
-  // Gets the number of iteration this timer was started/stopped.
-  uint32 GetIterations() const { return iterations_; }
-  bool IsRunning() const { return running_; }
-
- private:
-
-  bool running_;
-  uint32 start_;
-  uint32 elapsed_;
-  uint32 iterations_;
-
-  DISALLOW_EVIL_CONSTRUCTORS(LowResTimer);
-};
-
-inline double LowResTimer::GetSeconds() const {
-  return static_cast<double>(GetMilliseconds()) / 1000;
-}
-
-// WARNING - Timer is implemented on top of RDTSC and
-// QueryPerformanceCounter which have undefined behavior when running
-// on multi-core, speedstep, bugs in HAL, certain chipsets, etc.
-// Do not use the Timer in production code where the execution flow
-// depends on timing. Timer is primarily intended to be used for
-// code profiling and performance measurements.
-class Timer {
- public:
-  explicit Timer(bool running);
-  ~Timer();
-
-  // Timer keeps track of elapsed time, which can consist of multiple
-  // Start()-Stop() intervals.
-  void Start();
-
-  // returns time for last split (elapsed time since Start() or time since
-  // last Split(), whichever came last) as well as total elapsed time.
-  void Split(double* split_time_ms, double* total_time_ms);
-
-  // returns time elapsed (in hi-res perf-counts) between Start and Stop call
-  // and increments the time elapsed_
-  time64 Stop();
-  void Reset();
-
-  // return time in seconds, milliseconds, etc.
-  double GetSeconds() const;
-  double GetMilliseconds() const;
-  double GetMicroseconds() const;
-  double GetNanoseconds() const;
-  time64 Get100Nanoseconds() const;
-
-  // TODO(omaha): Probably should have been a static method, or even
-  // standalone func convert the high-perf counter to nano-seconds
-  double PerfCountToNanoSeconds(time64 perf_count) const;
-
-  // get the number of iteration this timer was started/stopped
-  uint32 GetIterations() const { return iterations_; }
-  bool IsRunning() const { return running_; }
-
-  // useful funcs beyond just the Timer class
-  static time64 GetRdtscCounter();  // return perf-counter value
-  static time64 GetRdtscFrequency();  // return perf-counter frequency
-
-    // outputs total time, number of iterations, and the average time
-#ifdef _DEBUG
-  CString DebugString() const;
-#endif
-
- private:
-
-  bool running_;
-  time64 start_;
-  time64 split_;
-  time64 elapsed_;
-  uint32 iterations_;
-  static time64 count_freq_;
-
-  DISALLOW_EVIL_CONSTRUCTORS(Timer);
-};
-
-// lint -e{533}  Function should return a value
-// lint -e{31}   Redefinition of symbol
-__forceinline time64 Timer::GetRdtscCounter() { __asm rdtsc }
-
-inline double Timer::PerfCountToNanoSeconds(time64 perf_count) const {
-  return (static_cast<double>(perf_count) / static_cast<double>(count_freq_)) *
-         static_cast<double>(1000000000.0);
-}
-
-inline double Timer::GetSeconds() const {
-  return GetNanoseconds() / 1000000000;
-}
-
-inline double Timer::GetMilliseconds() const {
-  return GetNanoseconds() / 1000000;
-}
-
-inline double Timer::GetMicroseconds() const {
-  return GetNanoseconds() / 1000;
-}
-
-inline time64 Timer::Get100Nanoseconds() const {
-  return (time64) GetNanoseconds() / 100;
-}
-
-// Helper class which starts the timer in its constructor and stops it
-// in its destructor.  This prevents accidentally leaving the timer running
-// if a function has an early exit.
-//
-// Usage:
-//
-// class A {
-//   Timer timer_;
-//
-//   void foo(){
-//     TimerScope (timer_);
-//   ......
-//   }  // end foo
-//
-// Everything is timed till the end of the function or when it returns
-// from any place.
-
-class TimerScope {
- public:
-  explicit TimerScope(Timer *timer) : timer_(timer) {
-    if (timer_) {
-      timer_->Start();
-    }
-  }
-
-  ~TimerScope() {
-    if (timer_ && timer_->IsRunning()) {
-      timer_->Stop();
-    }
-  }
-
- private:
-  Timer *timer_;
-  DISALLOW_EVIL_CONSTRUCTORS(TimerScope);
-};
-
-}  // namespace omaha
-
-#endif  // OMAHA_BASE_TIMER_H_
-