gold/timer.h

   1 // timer.h -- helper class for time accounting   -*- C++ -*-
   2
   3 // Copyright (C) 2009-2020 Free Software Foundation, Inc.
   4 // Written by Rafael Avila de Espindola <espindola@google.com>.
   5
   6 // This file is part of gold.
   7
   8 // This program is free software; you can redistribute it and/or modify
   9 // it under the terms of the GNU General Public License as published by
  10 // the Free Software Foundation; either version 3 of the License, or
  11 // (at your option) any later version.
  12
  13 // This program is distributed in the hope that it will be useful,
  14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 // GNU General Public License for more details.
  17
  18 // You should have received a copy of the GNU General Public License
  19 // along with this program; if not, write to the Free Software
  20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  21 // MA 02110-1301, USA.
  22
  23 #ifndef GOLD_TIMER_H
  24 #define GOLD_TIMER_H
  25
  26 namespace gold
  27 {
  28
  29 class Timer
  30 {
  31  public:
  32   // Used to report time statistics. All fields are in milliseconds.
  33   struct TimeStats
  34   {
  35     /* User time in this process.  */
  36     long user;
  37
  38     /* System time in this process.  */
  39     long sys;
  40
  41     /* Wall clock time.  */
  42     long wall;
  43   };
  44
  45   Timer();
  46
  47   // Return the stats since start was called.
  48   TimeStats
  49   get_elapsed_time();
  50
  51   // Return the stats for pass N (0 <= N <= 2).
  52   TimeStats
  53   get_pass_time(int n);
  54
  55   // Start counting the time.
  56   void
  57   start();
  58
  59   // Record the time used by pass N (0 <= N <= 2).
  60   void
  61   stamp(int n);
  62
  63  private:
  64   // This class cannot be copied.
  65   Timer(const Timer&);
  66   Timer& operator=(const Timer&);
  67
  68   // Write the current time information.
  69   static void
  70   get_time(TimeStats* now);
  71
  72   // The time of the last call to start.
  73   TimeStats start_time_;
  74
  75   // Times for each pass.
  76   TimeStats pass_times_[3];
  77 };
  78
  79 }
  80 #endif