| 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 | |
| 35 | namespace gold |
| 36 | { |
| 37 | |
| 38 | // Class Timer |
| 39 | |
| 40 | Timer::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. |
| 48 | void |
| 49 | Timer::start() |
| 50 | { |
| 51 | this->get_time(&this->start_time_); |
| 52 | } |
| 53 | |
| 54 | // Record the time used by pass N (0 <= N <= 2). |
| 55 | void |
| 56 | Timer::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. |
| 80 | static long ticks_per_sec; |
| 81 | class Timer_init |
| 82 | { |
| 83 | public: |
| 84 | Timer_init() |
| 85 | { |
| 86 | ticks_per_sec = TICKS_PER_SECOND; |
| 87 | } |
| 88 | }; |
| 89 | Timer_init timer_init; |
| 90 | |
| 91 | // Write the current time information. |
| 92 | void |
| 93 | Timer::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. |
| 108 | Timer::TimeStats |
| 109 | Timer::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). |
| 121 | Timer::TimeStats |
| 122 | Timer::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 | } |