Subversion Repositories open8_urisc

// timer.cc -- helper class for time accounting

// Copyright 2009, 2010 Free Software Foundation, Inc.

// Written by Rafael Avila de Espindola <espindola@google.com>.

// This file is part of gold.

// This program is free software; you can redistribute it and/or modify

// it under the terms of the GNU General Public License as published by

// the Free Software Foundation; either version 3 of the License, or

// (at your option) any later version.

// This program is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License

// along with this program; if not, write to the Free Software

// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,

// MA 02110-1301, USA.

#include "gold.h"

#ifdef HAVE_TIMES

#include <sys/times.h>

#endif

#include "libiberty.h"

#include "timer.h"

namespace gold

{

// Class Timer

Timer::Timer()

{

  this->start_time_.wall = 0;

  this->start_time_.user = 0;

  this->start_time_.sys = 0;

}

// Start counting the time.

void

Timer::start()

{

  this->get_time(&this->start_time_);

}

// Record the time used by pass N (0 <= N <= 2).

void

Timer::stamp(int n)

{

  gold_assert(n >= 0 && n <= 2);

  TimeStats& thispass = this->pass_times_[n];

  this->get_time(&thispass);

}

#if HAVE_SYSCONF && defined _SC_CLK_TCK

# define TICKS_PER_SECOND sysconf (_SC_CLK_TCK) /* POSIX 1003.1-1996 */

#else

# ifdef CLK_TCK

#  define TICKS_PER_SECOND CLK_TCK /* POSIX 1003.1-1988; obsolescent */

# else

#  ifdef HZ

#   define TICKS_PER_SECOND HZ  /* traditional UNIX */

#  else

#   define TICKS_PER_SECOND 100 /* often the correct value */

#  endif

# endif

#endif

// times returns statistics in clock_t units.  This variable will hold the

// conversion factor to seconds.  We use a variable that is initialized once

// because sysconf can be slow.

static long ticks_per_sec;

class Timer_init

{

 public:

  Timer_init()

  {

    ticks_per_sec = TICKS_PER_SECOND;

  }

};

Timer_init timer_init;

// Write the current time information.

void

Timer::get_time(TimeStats *now)

{

#ifdef HAVE_TIMES

  tms t;

  now->wall = (times(&t) * 1000) / ticks_per_sec;

  now->user = (t.tms_utime * 1000) / ticks_per_sec;

  now->sys  = (t.tms_stime * 1000) / ticks_per_sec;

#else

  now->wall = get_run_time() / 1000;

  now->user = 0;

  now->sys = 0;

#endif

}

// Return the stats since start was called.

Timer::TimeStats

Timer::get_elapsed_time()

{

  TimeStats now;

  this->get_time(&now);

  TimeStats delta;

  delta.wall = now.wall - this->start_time_.wall;

  delta.user = now.user - this->start_time_.user;

  delta.sys = now.sys - this->start_time_.sys;

  return delta;

}

// Return the stats for pass N (0 <= N <= 2).

Timer::TimeStats

Timer::get_pass_time(int n)

{

  gold_assert(n >= 0 && n <= 2);

  TimeStats thispass = this->pass_times_[n];

  TimeStats& lastpass = n > 0 ? this->pass_times_[n-1] : this->start_time_;

  thispass.wall -= lastpass.wall;

  thispass.user -= lastpass.user;

  thispass.sys -= lastpass.sys;

  return thispass;

}

}