1// timer.h -- helper class for time accounting   -*- C++ -*-
2
3// Copyright (C) 2009-2017 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
26namespace gold
27{
28
29class 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
81