Merge branch 'vendor/GCC50'
[dragonfly.git] / contrib / binutils-2.24 / gold / timer.cc
CommitLineData
f40e693d
JM
1// timer.cc -- helper class for time accounting
2
3// Copyright 2009, 2010 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#include "gold.h"
24
25#include <unistd.h>
26
27#ifdef HAVE_TIMES
28#include <sys/times.h>
29#endif
30
31#include "libiberty.h"
32
33#include "timer.h"
34
35namespace gold
36{
37
38// Class Timer
39
40Timer::Timer()
41{
42 this->start_time_.wall = 0;
43 this->start_time_.user = 0;
44 this->start_time_.sys = 0;
45}
46
47// Start counting the time.
48void
49Timer::start()
50{
51 this->get_time(&this->start_time_);
52}
53
54// Record the time used by pass N (0 <= N <= 2).
55void
56Timer::stamp(int n)
57{
58 gold_assert(n >= 0 && n <= 2);
59 TimeStats& thispass = this->pass_times_[n];
60 this->get_time(&thispass);
61}
62
63#if HAVE_SYSCONF && defined _SC_CLK_TCK
64# define TICKS_PER_SECOND sysconf (_SC_CLK_TCK) /* POSIX 1003.1-1996 */
65#else
66# ifdef CLK_TCK
67# define TICKS_PER_SECOND CLK_TCK /* POSIX 1003.1-1988; obsolescent */
68# else
69# ifdef HZ
70# define TICKS_PER_SECOND HZ /* traditional UNIX */
71# else
72# define TICKS_PER_SECOND 100 /* often the correct value */
73# endif
74# endif
75#endif
76
77// times returns statistics in clock_t units. This variable will hold the
78// conversion factor to seconds. We use a variable that is initialized once
79// because sysconf can be slow.
80static long ticks_per_sec;
81class Timer_init
82{
83 public:
84 Timer_init()
85 {
86 ticks_per_sec = TICKS_PER_SECOND;
87 }
88};
89Timer_init timer_init;
90
91// Write the current time information.
92void
93Timer::get_time(TimeStats *now)
94{
95#ifdef HAVE_TIMES
96 tms t;
97 now->wall = (times(&t) * 1000) / ticks_per_sec;
98 now->user = (t.tms_utime * 1000) / ticks_per_sec;
99 now->sys = (t.tms_stime * 1000) / ticks_per_sec;
100#else
101 now->wall = get_run_time() / 1000;
102 now->user = 0;
103 now->sys = 0;
104#endif
105}
106
107// Return the stats since start was called.
108Timer::TimeStats
109Timer::get_elapsed_time()
110{
111 TimeStats now;
112 this->get_time(&now);
113 TimeStats delta;
114 delta.wall = now.wall - this->start_time_.wall;
115 delta.user = now.user - this->start_time_.user;
116 delta.sys = now.sys - this->start_time_.sys;
117 return delta;
118}
119
120// Return the stats for pass N (0 <= N <= 2).
121Timer::TimeStats
122Timer::get_pass_time(int n)
123{
124 gold_assert(n >= 0 && n <= 2);
125 TimeStats thispass = this->pass_times_[n];
126 TimeStats& lastpass = n > 0 ? this->pass_times_[n-1] : this->start_time_;
127 thispass.wall -= lastpass.wall;
128 thispass.user -= lastpass.user;
129 thispass.sys -= lastpass.sys;
130 return thispass;
131}
132
133}