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
81