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d675ff46 RÁE |
1 | // timer.cc -- helper class for time accounting |
2 | ||
bca1c3ae | 3 | // Copyright 2009, 2010 Free Software Foundation, Inc. |
d675ff46 RÁE |
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 | ||
bca1c3ae | 25 | #ifdef HAVE_TIMES |
d675ff46 | 26 | #include <sys/times.h> |
bca1c3ae | 27 | #endif |
d675ff46 RÁE |
28 | |
29 | #include "libiberty.h" | |
30 | ||
31 | #include "timer.h" | |
32 | ||
33 | namespace gold | |
34 | { | |
35 | ||
36 | // Class Timer | |
37 | ||
38 | Timer::Timer() | |
39 | { | |
40 | this->start_time_.wall = 0; | |
41 | this->start_time_.user = 0; | |
42 | this->start_time_.sys = 0; | |
43 | } | |
44 | ||
9b547ce6 | 45 | // Start counting the time. |
d675ff46 | 46 | void |
ca09d69a | 47 | Timer::start() |
d675ff46 RÁE |
48 | { |
49 | this->get_time(&this->start_time_); | |
50 | } | |
51 | ||
b490c0bb CC |
52 | // Record the time used by pass N (0 <= N <= 2). |
53 | void | |
54 | Timer::stamp(int n) | |
55 | { | |
56 | gold_assert(n >= 0 && n <= 2); | |
57 | TimeStats& thispass = this->pass_times_[n]; | |
58 | this->get_time(&thispass); | |
59 | } | |
60 | ||
d675ff46 RÁE |
61 | #if HAVE_SYSCONF && defined _SC_CLK_TCK |
62 | # define TICKS_PER_SECOND sysconf (_SC_CLK_TCK) /* POSIX 1003.1-1996 */ | |
63 | #else | |
64 | # ifdef CLK_TCK | |
65 | # define TICKS_PER_SECOND CLK_TCK /* POSIX 1003.1-1988; obsolescent */ | |
66 | # else | |
67 | # ifdef HZ | |
68 | # define TICKS_PER_SECOND HZ /* traditional UNIX */ | |
69 | # else | |
70 | # define TICKS_PER_SECOND 100 /* often the correct value */ | |
71 | # endif | |
72 | # endif | |
73 | #endif | |
74 | ||
9b547ce6 RW |
75 | // times returns statistics in clock_t units. This variable will hold the |
76 | // conversion factor to seconds. We use a variable that is initialized once | |
d675ff46 RÁE |
77 | // because sysconf can be slow. |
78 | static long ticks_per_sec; | |
79 | class Timer_init | |
80 | { | |
81 | public: | |
82 | Timer_init() | |
83 | { | |
84 | ticks_per_sec = TICKS_PER_SECOND; | |
85 | } | |
86 | }; | |
87 | Timer_init timer_init; | |
88 | ||
9b547ce6 | 89 | // Write the current time information. |
d675ff46 | 90 | void |
ca09d69a | 91 | Timer::get_time(TimeStats *now) |
d675ff46 RÁE |
92 | { |
93 | #ifdef HAVE_TIMES | |
94 | tms t; | |
95 | now->wall = (times(&t) * 1000) / ticks_per_sec; | |
96 | now->user = (t.tms_utime * 1000) / ticks_per_sec; | |
97 | now->sys = (t.tms_stime * 1000) / ticks_per_sec; | |
98 | #else | |
99 | now->wall = get_run_time() / 1000; | |
100 | now->user = 0; | |
101 | now->sys = 0; | |
102 | #endif | |
103 | } | |
104 | ||
105 | // Return the stats since start was called. | |
106 | Timer::TimeStats | |
ca09d69a | 107 | Timer::get_elapsed_time() |
d675ff46 RÁE |
108 | { |
109 | TimeStats now; | |
110 | this->get_time(&now); | |
111 | TimeStats delta; | |
112 | delta.wall = now.wall - this->start_time_.wall; | |
113 | delta.user = now.user - this->start_time_.user; | |
114 | delta.sys = now.sys - this->start_time_.sys; | |
115 | return delta; | |
116 | } | |
117 | ||
b490c0bb CC |
118 | // Return the stats for pass N (0 <= N <= 2). |
119 | Timer::TimeStats | |
120 | Timer::get_pass_time(int n) | |
121 | { | |
122 | gold_assert(n >= 0 && n <= 2); | |
123 | TimeStats thispass = this->pass_times_[n]; | |
124 | TimeStats& lastpass = n > 0 ? this->pass_times_[n-1] : this->start_time_; | |
125 | thispass.wall -= lastpass.wall; | |
126 | thispass.user -= lastpass.user; | |
127 | thispass.sys -= lastpass.sys; | |
128 | return thispass; | |
129 | } | |
130 | ||
d675ff46 | 131 | } |