text: /*
   * Copyright 2003, 2004, 2005, 2006 PathScale, Inc.  All Rights Reserved.
   */
  
  /* Timing variables for measuring compiler performance.
     Copyright (C) 2000 Free Software Foundation, Inc.
     Contributed by Alex Samuel <samuel@codesourcery.com>
  
  This file is part of GCC.
  
  GCC 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 2, or (at your option) any later
  version.
  
  GCC 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 GCC; see the file COPYING.  If not, write to the Free
  Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  02111-1307, USA.  */
  
  #include "config.h"
  #include "system.h"
  #include "intl.h"
  #include "rtl.h"
  
  #ifdef HAVE_SYS_TIMES_H
  # include <sys/times.h>
  #endif
  #ifdef HAVE_SYS_RESOURCE_H
  #include <sys/resource.h>
  #endif
  
  #ifndef SGI_MONGOOSE
  // defined in /usr/include/time.h; why redefine?
  #ifndef HAVE_CLOCK_T
  typedef int clock_t;
  #endif
  #endif /* SGI_MONGOOSE */
  
  #ifndef SGI_MONGOOSE
  // defined in /usr/include/sys/times.h; why redefine?
  #ifndef HAVE_STRUCT_TMS
  struct tms
  {
    clock_t tms_utime;
    clock_t tms_stime;
    clock_t tms_cutime;
    clock_t tms_cstime;
  };
  #endif
  #endif /* SGI_MONGOOSE */
  
  #if defined HAVE_DECL_GETRUSAGE && !HAVE_DECL_GETRUSAGE
  extern int getrusage PARAMS ((int, struct rusage *));
  #endif
  #if defined HAVE_DECL_TIMES && !HAVE_DECL_TIMES
  extern clock_t times PARAMS ((struct tms *));
  #endif
  #if defined HAVE_DECL_CLOCK && !HAVE_DECL_CLOCK
  extern clock_t clock PARAMS ((void));
  #endif
  
  #ifndef RUSAGE_SELF
  # define RUSAGE_SELF 0
  #endif
  
  /* Calculation of scale factor to convert ticks to microseconds.
     We mustn't use CLOCKS_PER_SEC except with clock().  */
  #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
  
  /* Prefer times to getrusage to clock (each gives successively less
     information).  */
  #ifdef HAVE_TIMES
  # define USE_TIMES
  # define HAVE_USER_TIME
  # define HAVE_SYS_TIME
  # define HAVE_WALL_TIME
  #else
  #ifdef HAVE_GETRUSAGE
  # define USE_GETRUSAGE
  # define HAVE_USER_TIME
  # define HAVE_SYS_TIME
  #else
  #ifdef HAVE_CLOCK
  # define USE_CLOCK
  # define HAVE_USER_TIME
  #endif
  #endif
  #endif
  
  /* libc is very likely to have snuck a call to sysconf() into one of
     the underlying constants, and that can be very slow, so we have to
     precompute them.  Whose wonderful idea was it to make all those
     _constants_ variable at run time, anyway?  */
  #ifdef USE_TIMES
  static float ticks_to_msec;
  #define TICKS_TO_MSEC (1 / (float)TICKS_PER_SECOND)
  #endif
  
  #ifdef USE_CLOCK
  static float clocks_to_msec;
  #define CLOCKS_TO_MSEC (1 / (float)CLOCKS_PER_SEC)
  #endif
  
  #include "flags.h"
  #include "timevar.h"
  #include "toplev.h"
  
  /* See timevar.h for an explanation of timing variables.  */
  
  /* This macro evaluates to nonzero if timing variables are enabled.  */
  #define TIMEVAR_ENABLE (time_report)
  
  /* A timing variable.  */
  
  struct timevar_def
  {
    /* Elapsed time for this variable.  */
    struct timevar_time_def elapsed;
  
    /* If this variable is timed independently of the timing stack,
       using timevar_start, this contains the start time.  */
    struct timevar_time_def start_time;
  
    /* The name of this timing variable.  */
    const char *name;
  
    /* Non-zero if this timing variable is running as a standalone
       timer.  */
    unsigned standalone : 1;
  
    /* Non-zero if this timing variable was ever started or pushed onto
       the timing stack.  */
    unsigned used : 1;
  };
  
  /* An element on the timing stack.  Elapsed time is attributed to the
     topmost timing variable on the stack.  */
  
  struct timevar_stack_def
  {
    /* The timing variable at this stack level.  */
    struct timevar_def *timevar;
  
    /* The next lower timing variable context in the stack.  */
    struct timevar_stack_def *next;
  };
  
  /* Declared timing variables.  Constructed from the contents of
     timevar.def.  */
  static struct timevar_def timevars[TIMEVAR_LAST];
  
  /* The top of the timing stack.  */
  static struct timevar_stack_def *stack;
  
  /* A list of unused (i.e. allocated and subsequently popped)
     timevar_stack_def instances.  */
  static struct timevar_stack_def *unused_stack_instances;
  
  /* The time at which the topmost element on the timing stack was
     pushed.  Time elapsed since then is attributed to the topmost
     element.  */
  static struct timevar_time_def start_time;
  
  static void get_time
    PARAMS ((struct timevar_time_def *));
  static void timevar_accumulate
    PARAMS ((struct timevar_time_def *, struct timevar_time_def *,
  	   struct timevar_time_def *));
  
  /* Fill the current times into TIME.  The definition of this function
     also defines any or all of the HAVE_USER_TIME, HAVE_SYS_TIME, and
     HAVE_WALL_TIME macros.  */
  
  static void
  get_time (now)
       struct timevar_time_def *now;
  {
    now->user = 0;
    now->sys  = 0;
    now->wall = 0;
  
    if (!TIMEVAR_ENABLE)
      return;
  
    {
  #ifdef USE_TIMES
      struct tms tms;
      now->wall = times (&tms)  * ticks_to_msec;
      now->user = tms.tms_utime * ticks_to_msec;
      now->sys  = tms.tms_stime * ticks_to_msec;
  #endif
  #ifdef USE_GETRUSAGE
      struct rusage rusage;
      getrusage (RUSAGE_SELF, &rusage);
      now->user = rusage.ru_utime.tv_sec + rusage.ru_utime.tv_usec * 1e-6;
      now->sys  = rusage.ru_stime.tv_sec + rusage.ru_stime.tv_usec * 1e-6;
  #endif
  #ifdef USE_CLOCK
      now->user = clock () * clocks_to_msec;
  #endif
    }
  }
  
  /* Add the difference between STOP_TIME and START_TIME to TIMER.  */
  
  static void
  timevar_accumulate (timer, start_time, stop_time)
       struct timevar_time_def *timer;
       struct timevar_time_def *start_time;
       struct timevar_time_def *stop_time;
  {
    timer->user += stop_time->user - start_time->user;
    timer->sys += stop_time->sys - start_time->sys;
    timer->wall += stop_time->wall - start_time->wall;
  }
  
  /* Initialize timing variables.  */
  
  void
  init_timevar ()
  {
    if (!TIMEVAR_ENABLE)
      return;
  
    /* Zero all elapsed times.  */
    memset ((void *) timevars, 0, sizeof (timevars));
  
    /* Initialize the names of timing variables.  */
  #define DEFTIMEVAR(identifier__, name__) \
    timevars[identifier__].name = name__;
  #include "timevar.def"
  #undef DEFTIMEVAR
  
  #ifdef USE_TIMES
    ticks_to_msec = TICKS_TO_MSEC;
  #endif
  #ifdef USE_CLOCK
    clocks_to_msec = CLOCKS_TO_MSEC;
  #endif
  }
  
  /* Push TIMEVAR onto the timing stack.  No further elapsed time is
     attributed to the previous topmost timing variable on the stack;
     subsequent elapsed time is attributed to TIMEVAR, until it is
     popped or another element is pushed on top.
  
     TIMEVAR cannot be running as a standalone timer.  */
  
  void
  timevar_push (timevar)
       timevar_id_t timevar;
  {
    struct timevar_def *tv = &timevars[timevar];
    struct timevar_stack_def *context;
    struct timevar_time_def now;
  
    if (!TIMEVAR_ENABLE)
      return;
  
    /* Mark this timing variable as used.  */
    tv->used = 1;
  
    /* Can't push a standalone timer.  */
    if (tv->standalone)
      abort ();
  
    /* What time is it?  */
    get_time (&now);
  
    /* If the stack isn't empty, attribute the current elapsed time to
       the old topmost element.  */
    if (stack)
      timevar_accumulate (&stack->timevar->elapsed, &start_time, &now);
  
    /* Reset the start time; from now on, time is attributed to
       TIMEVAR.  */
    start_time = now;
  
    /* See if we have a previously-allocated stack instance.  If so,
       take it off the list.  If not, malloc a new one.  */
    if (unused_stack_instances != NULL)
      {
        context = unused_stack_instances;
        unused_stack_instances = unused_stack_instances->next;
      }
    else
      context = (struct timevar_stack_def *)
        xmalloc (sizeof (struct timevar_stack_def));
  
    /* Fill it in and put it on the stack.  */
    context->timevar = tv;
    context->next = stack;
    stack = context;
  }
  
  /* Pop the topmost timing variable element off the timing stack.  The
     popped variable must be TIMEVAR.  Elapsed time since the that
     element was pushed on, or since it was last exposed on top of the
     stack when the element above it was popped off, is credited to that
     timing variable.  */
  
  void
  timevar_pop (timevar)
       timevar_id_t timevar;
  {
    struct timevar_time_def now;
    struct timevar_stack_def *popped = stack;
  
    if (!TIMEVAR_ENABLE)
      return;
  
    if (&timevars[timevar] != stack->timevar)
      {
        sorry ("cannot timevar_pop '%s' when top of timevars stack is '%s'",
               timevars[timevar].name, stack->timevar->name);
        abort ();
      }
  
    /* What time is it?  */
    get_time (&now);
  
    /* Attribute the elapsed time to the element we're popping.  */
    timevar_accumulate (&popped->timevar->elapsed, &start_time, &now);
  
    /* Reset the start time; from now on, time is attributed to the
       element just exposed on the stack.  */
    start_time = now;
  
    /* Take the item off the stack.  */
    stack = stack->next;
  
    /* Don't delete the stack element; instead, add it to the list of
       unused elements for later use.  */
    popped->next = unused_stack_instances;
    unused_stack_instances = popped;
  }
  
  /* Start timing TIMEVAR independently of the timing stack.  Elapsed
     time until timevar_stop is called for the same timing variable is
     attributed to TIMEVAR.  */
  
  void
  timevar_start (timevar)
       timevar_id_t timevar;
  {
    struct timevar_def *tv = &timevars[timevar];
  
    if (!TIMEVAR_ENABLE)
      return;
  
    /* Mark this timing variable as used.  */
    tv->used = 1;
  
    /* Don't allow the same timing variable to be started more than
       once.  */
    if (tv->standalone)
      abort ();
    tv->standalone = 1;
  
    get_time (&tv->start_time);
  }
  
  /* Stop timing TIMEVAR.  Time elapsed since timevar_start was called
     is attributed to it.  */
  
  void
  timevar_stop (timevar)
       timevar_id_t timevar;
  {
    struct timevar_def *tv = &timevars[timevar];
    struct timevar_time_def now;
  
    if (!TIMEVAR_ENABLE)
      return;
  
    /* TIMEVAR must have been started via timevar_start.  */
    if (!tv->standalone)
      abort ();
  
    get_time (&now);
    timevar_accumulate (&tv->elapsed, &tv->start_time, &now);
  }
  
  /* Fill the elapsed time for TIMEVAR into ELAPSED.  Returns
     update-to-date information even if TIMEVAR is currently running.  */
  
  void
  timevar_get (timevar, elapsed)
       timevar_id_t timevar;
       struct timevar_time_def *elapsed;
  {
    struct timevar_def *tv = &timevars[timevar];
    struct timevar_time_def now;
  
    *elapsed = tv->elapsed;
  
    /* Is TIMEVAR currently running as a standalone timer?  */
    if (tv->standalone)
      {
        get_time (&now);
        timevar_accumulate (elapsed, &tv->start_time, &now);
      }
    /* Or is TIMEVAR at the top of the timer stack?  */
    else if (stack->timevar == tv)
      {
        get_time (&now);
        timevar_accumulate (elapsed, &start_time, &now);
      }
  }
  
  /* Summarize timing variables to FP.  The timing variable TV_TOTAL has
     a special meaning -- it's considered to be the total elapsed time,
     for normalizing the others, and is displayed last.  */
  
  void
  timevar_print (fp)
       FILE *fp;
  {
    /* Only print stuff if we have some sort of time information.  */
  #if defined (HAVE_USER_TIME) || defined (HAVE_SYS_TIME) || defined (HAVE_WALL_TIME)
    unsigned int /* timevar_id_t */ id;
    struct timevar_time_def *total = &timevars[TV_TOTAL].elapsed;
    struct timevar_time_def now;
  
    if (!TIMEVAR_ENABLE)
      return;
  
    /* Update timing information in case we're calling this from GDB.  */
  
    if (fp == 0)
      fp = stderr;
  
    /* What time is it?  */
    get_time (&now);
  
    /* If the stack isn't empty, attribute the current elapsed time to
       the old topmost element.  */
    if (stack)
      timevar_accumulate (&stack->timevar->elapsed, &start_time, &now);
  
    /* Reset the start time; from now on, time is attributed to
       TIMEVAR.  */
    start_time = now;
  
    fputs (_("\nExecution times (seconds)\n"), fp);
    for (id = 0; id < (unsigned int) TIMEVAR_LAST; ++id)
      {
        struct timevar_def *tv = &timevars[(timevar_id_t) id];
        const float tiny = 5e-3;
  
        /* Don't print the total execution time here; that goes at the
  	 end.  */
        if ((timevar_id_t) id == TV_TOTAL)
  	continue;
  
        /* Don't print timing variables that were never used.  */
        if (!tv->used)
  	continue;
  
        /* Don't print timing variables if we're going to get a row of
           zeroes.  */
        if (tv->elapsed.user < tiny
  	  && tv->elapsed.sys < tiny
  	  && tv->elapsed.wall < tiny)
  	continue;
  
        /* The timing variable name.  */
        fprintf (fp, " %-22s:", tv->name);
  
  #ifdef HAVE_USER_TIME
        /* Print user-mode time for this process.  */
        fprintf (fp, "%7.2f (%2.0f%%) usr",
  	       tv->elapsed.user,
  	       (total->user == 0 ? 0 : tv->elapsed.user / total->user) * 100);
  #endif /* HAVE_USER_TIME */
  
  #ifdef HAVE_SYS_TIME
        /* Print system-mode time for this process.  */
        fprintf (fp, "%7.2f (%2.0f%%) sys",
  	       tv->elapsed.sys,
  	       (total->sys == 0 ? 0 : tv->elapsed.sys / total->sys) * 100);
  #endif /* HAVE_SYS_TIME */
  
  #ifdef HAVE_WALL_TIME
        /* Print wall clock time elapsed.  */
        fprintf (fp, "%7.2f (%2.0f%%) wall",
  	       tv->elapsed.wall,
  	       (total->wall == 0 ? 0 : tv->elapsed.wall / total->wall) * 100);
  #endif /* HAVE_WALL_TIME */
  
        putc ('\n', fp);
      }
  
    /* Print total time.  */
    fputs (_(" TOTAL                 :"), fp);
  #ifdef HAVE_USER_TIME
    fprintf (fp, "%7.2f          ", total->user);
  #endif
  #ifdef HAVE_SYS_TIME
    fprintf (fp, "%7.2f          ", total->sys);
  #endif
  #ifdef HAVE_WALL_TIME
    fprintf (fp, "%7.2f\n", total->wall);
  #endif
  
  #endif /* defined (HAVE_USER_TIME) || defined (HAVE_SYS_TIME)
  	  || defined (HAVE_WALL_TIME) */
  }
  
  /* Returns time (user + system) used so far by the compiler process,
     in microseconds.  */
  
  long
  get_run_time ()
  {
    struct timevar_time_def total_elapsed;
    timevar_get (TV_TOTAL, &total_elapsed);
    return total_elapsed.user + total_elapsed.sys;
  }
  
  /* Prints a message to stderr stating that time elapsed in STR is
     TOTAL (given in microseconds).  */
  
  void
  print_time (str, total)
       const char *str;
       long total;
  {
    long all_time = get_run_time ();
    fprintf (stderr,
  	   _("time in %s: %ld.%06ld (%ld%%)\n"),
  	   str, total / 1000000, total % 1000000,
  	   all_time == 0 ? 0
  	   : (long) (((100.0 * (double) total) / (double) all_time) + .5));
  }
  