1// timer.cc -- helper class for time accounting 2 3// Copyright (C) 2009-2022 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} 134