gcc/timevar.c

   1 /* Timing variables for measuring compiler performance.
   2    Copyright (C) 2000, 2003, 2004 Free Software Foundation, Inc.
   3    Contributed by Alex Samuel <samuel@codesourcery.com>
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 2, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING.  If not, write to the Free
  19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  20 02111-1307, USA.  */
  21
  22 #include "config.h"
  23 #include "system.h"
  24 #ifdef HAVE_SYS_TIMES_H
  25 # include <sys/times.h>
  26 #endif
  27 #ifdef HAVE_SYS_RESOURCE_H
  28 #include <sys/resource.h>
  29 #endif
  30 #include "coretypes.h"
  31 #include "tm.h"
  32 #include "intl.h"
  33 #include "rtl.h"
  34 #include "toplev.h"
  35
  36 #ifndef HAVE_CLOCK_T
  37 typedef int clock_t;
  38 #endif
  39
  40 #ifndef HAVE_STRUCT_TMS
  41 struct tms
  42 {
  43   clock_t tms_utime;
  44   clock_t tms_stime;
  45   clock_t tms_cutime;
  46   clock_t tms_cstime;
  47 };
  48 #endif
  49
  50 #ifndef RUSAGE_SELF
  51 # define RUSAGE_SELF 0
  52 #endif
  53
  54 /* Calculation of scale factor to convert ticks to microseconds.
  55    We mustn't use CLOCKS_PER_SEC except with clock().  */
  56 #if HAVE_SYSCONF && defined _SC_CLK_TCK
  57 # define TICKS_PER_SECOND sysconf (_SC_CLK_TCK) /* POSIX 1003.1-1996 */
  58 #else
  59 # ifdef CLK_TCK
  60 #  define TICKS_PER_SECOND CLK_TCK /* POSIX 1003.1-1988; obsolescent */
  61 # else
  62 #  ifdef HZ
  63 #   define TICKS_PER_SECOND HZ  /* traditional UNIX */
  64 #  else
  65 #   define TICKS_PER_SECOND 100 /* often the correct value */
  66 #  endif
  67 # endif
  68 #endif
  69
  70 /* Prefer times to getrusage to clock (each gives successively less
  71    information).  */
  72 #ifdef HAVE_TIMES
  73 # if defined HAVE_DECL_TIMES && !HAVE_DECL_TIMES
  74   extern clock_t times (struct tms *);
  75 # endif
  76 # define USE_TIMES
  77 # define HAVE_USER_TIME
  78 # define HAVE_SYS_TIME
  79 # define HAVE_WALL_TIME
  80 #else
  81 #ifdef HAVE_GETRUSAGE
  82 # if defined HAVE_DECL_GETRUSAGE && !HAVE_DECL_GETRUSAGE
  83   extern int getrusage (int, struct rusage *);
  84 # endif
  85 # define USE_GETRUSAGE
  86 # define HAVE_USER_TIME
  87 # define HAVE_SYS_TIME
  88 #else
  89 #ifdef HAVE_CLOCK
  90 # if defined HAVE_DECL_CLOCK && !HAVE_DECL_CLOCK
  91   extern clock_t clock (void);
  92 # endif
  93 # define USE_CLOCK
  94 # define HAVE_USER_TIME
  95 #endif
  96 #endif
  97 #endif
  98
  99 /* libc is very likely to have snuck a call to sysconf() into one of
 100    the underlying constants, and that can be very slow, so we have to
 101    precompute them.  Whose wonderful idea was it to make all those
 102    _constants_ variable at run time, anyway?  */
 103 #ifdef USE_TIMES
 104 static double ticks_to_msec;
 105 #define TICKS_TO_MSEC (1 / (double)TICKS_PER_SECOND)
 106 #endif
 107
 108 #ifdef USE_CLOCK
 109 static double clocks_to_msec;
 110 #define CLOCKS_TO_MSEC (1 / (double)CLOCKS_PER_SEC)
 111 #endif
 112
 113 #include "flags.h"
 114 #include "timevar.h"
 115
 116 static bool timevar_enable;
 117
 118 /* See timevar.h for an explanation of timing variables.  */
 119
 120 /* A timing variable.  */
 121
 122 struct timevar_def
 123 {
 124   /* Elapsed time for this variable.  */
 125   struct timevar_time_def elapsed;
 126
 127   /* If this variable is timed independently of the timing stack,
 128      using timevar_start, this contains the start time.  */
 129   struct timevar_time_def start_time;
 130
 131   /* The name of this timing variable.  */
 132   const char *name;
 133
 134   /* Nonzero if this timing variable is running as a standalone
 135      timer.  */
 136   unsigned standalone : 1;
 137
 138   /* Nonzero if this timing variable was ever started or pushed onto
 139      the timing stack.  */
 140   unsigned used : 1;
 141 };
 142
 143 /* An element on the timing stack.  Elapsed time is attributed to the
 144    topmost timing variable on the stack.  */
 145
 146 struct timevar_stack_def
 147 {
 148   /* The timing variable at this stack level.  */
 149   struct timevar_def *timevar;
 150
 151   /* The next lower timing variable context in the stack.  */
 152   struct timevar_stack_def *next;
 153 };
 154
 155 /* Declared timing variables.  Constructed from the contents of
 156    timevar.def.  */
 157 static struct timevar_def timevars[TIMEVAR_LAST];
 158
 159 /* The top of the timing stack.  */
 160 static struct timevar_stack_def *stack;
 161
 162 /* A list of unused (i.e. allocated and subsequently popped)
 163    timevar_stack_def instances.  */
 164 static struct timevar_stack_def *unused_stack_instances;
 165
 166 /* The time at which the topmost element on the timing stack was
 167    pushed.  Time elapsed since then is attributed to the topmost
 168    element.  */
 169 static struct timevar_time_def start_time;
 170
 171 static void get_time (struct timevar_time_def *);
 172 static void timevar_accumulate (struct timevar_time_def *,
 173                                 struct timevar_time_def *,
 174                                 struct timevar_time_def *);
 175
 176 /* Fill the current times into TIME.  The definition of this function
 177    also defines any or all of the HAVE_USER_TIME, HAVE_SYS_TIME, and
 178    HAVE_WALL_TIME macros.  */
 179
 180 static void
 181 get_time (struct timevar_time_def *now)
 182 {
 183   now->user = 0;
 184   now->sys  = 0;
 185   now->wall = 0;
 186
 187   if (!timevar_enable)
 188     return;
 189
 190   {
 191 #ifdef USE_TIMES
 192     struct tms tms;
 193     now->wall = times (&tms)  * ticks_to_msec;
 194     now->user = tms.tms_utime * ticks_to_msec;
 195     now->sys  = tms.tms_stime * ticks_to_msec;
 196 #endif
 197 #ifdef USE_GETRUSAGE
 198     struct rusage rusage;
 199     getrusage (RUSAGE_SELF, &rusage);
 200     now->user = rusage.ru_utime.tv_sec + rusage.ru_utime.tv_usec * 1e-6;
 201     now->sys  = rusage.ru_stime.tv_sec + rusage.ru_stime.tv_usec * 1e-6;
 202 #endif
 203 #ifdef USE_CLOCK
 204     now->user = clock () * clocks_to_msec;
 205 #endif
 206   }
 207 }
 208
 209 /* Add the difference between STOP_TIME and START_TIME to TIMER.  */
 210
 211 static void
 212 timevar_accumulate (struct timevar_time_def *timer,
 213                     struct timevar_time_def *start_time,
 214                     struct timevar_time_def *stop_time)
 215 {
 216   timer->user += stop_time->user - start_time->user;
 217   timer->sys += stop_time->sys - start_time->sys;
 218   timer->wall += stop_time->wall - start_time->wall;
 219 }
 220
 221 /* Initialize timing variables.  */
 222
 223 void
 224 timevar_init (void)
 225 {
 226   timevar_enable = true;
 227
 228   /* Zero all elapsed times.  */
 229   memset (timevars, 0, sizeof (timevars));
 230
 231   /* Initialize the names of timing variables.  */
 232 #define DEFTIMEVAR(identifier__, name__) \
 233   timevars[identifier__].name = name__;
 234 #include "timevar.def"
 235 #undef DEFTIMEVAR
 236
 237 #ifdef USE_TIMES
 238   ticks_to_msec = TICKS_TO_MSEC;
 239 #endif
 240 #ifdef USE_CLOCK
 241   clocks_to_msec = CLOCKS_TO_MSEC;
 242 #endif
 243 }
 244
 245 /* Push TIMEVAR onto the timing stack.  No further elapsed time is
 246    attributed to the previous topmost timing variable on the stack;
 247    subsequent elapsed time is attributed to TIMEVAR, until it is
 248    popped or another element is pushed on top.
 249
 250    TIMEVAR cannot be running as a standalone timer.  */
 251
 252 void
 253 timevar_push (timevar_id_t timevar)
 254 {
 255   struct timevar_def *tv = &timevars[timevar];
 256   struct timevar_stack_def *context;
 257   struct timevar_time_def now;
 258
 259   if (!timevar_enable)
 260     return;
 261
 262   /* Mark this timing variable as used.  */
 263   tv->used = 1;
 264
 265   /* Can't push a standalone timer.  */
 266   gcc_assert (!tv->standalone);
 267
 268   /* What time is it?  */
 269   get_time (&now);
 270
 271   /* If the stack isn't empty, attribute the current elapsed time to
 272      the old topmost element.  */
 273   if (stack)
 274     timevar_accumulate (&stack->timevar->elapsed, &start_time, &now);
 275
 276   /* Reset the start time; from now on, time is attributed to
 277      TIMEVAR.  */
 278   start_time = now;
 279
 280   /* See if we have a previously-allocated stack instance.  If so,
 281      take it off the list.  If not, malloc a new one.  */
 282   if (unused_stack_instances != NULL)
 283     {
 284       context = unused_stack_instances;
 285       unused_stack_instances = unused_stack_instances->next;
 286     }
 287   else
 288     context = xmalloc (sizeof (struct timevar_stack_def));
 289
 290   /* Fill it in and put it on the stack.  */
 291   context->timevar = tv;
 292   context->next = stack;
 293   stack = context;
 294 }
 295
 296 /* Pop the topmost timing variable element off the timing stack.  The
 297    popped variable must be TIMEVAR.  Elapsed time since the that
 298    element was pushed on, or since it was last exposed on top of the
 299    stack when the element above it was popped off, is credited to that
 300    timing variable.  */
 301
 302 void
 303 timevar_pop (timevar_id_t timevar)
 304 {
 305   struct timevar_time_def now;
 306   struct timevar_stack_def *popped = stack;
 307
 308   if (!timevar_enable)
 309     return;
 310
 311   gcc_assert (&timevars[timevar] == stack->timevar);
 312
 313   /* What time is it?  */
 314   get_time (&now);
 315
 316   /* Attribute the elapsed time to the element we're popping.  */
 317   timevar_accumulate (&popped->timevar->elapsed, &start_time, &now);
 318
 319   /* Reset the start time; from now on, time is attributed to the
 320      element just exposed on the stack.  */
 321   start_time = now;
 322
 323   /* Take the item off the stack.  */
 324   stack = stack->next;
 325
 326   /* Don't delete the stack element; instead, add it to the list of
 327      unused elements for later use.  */
 328   popped->next = unused_stack_instances;
 329   unused_stack_instances = popped;
 330 }
 331
 332 /* Start timing TIMEVAR independently of the timing stack.  Elapsed
 333    time until timevar_stop is called for the same timing variable is
 334    attributed to TIMEVAR.  */
 335
 336 void
 337 timevar_start (timevar_id_t timevar)
 338 {
 339   struct timevar_def *tv = &timevars[timevar];
 340
 341   if (!timevar_enable)
 342     return;
 343
 344   /* Mark this timing variable as used.  */
 345   tv->used = 1;
 346
 347   /* Don't allow the same timing variable to be started more than
 348      once.  */
 349   gcc_assert (!tv->standalone);
 350   tv->standalone = 1;
 351
 352   get_time (&tv->start_time);
 353 }
 354
 355 /* Stop timing TIMEVAR.  Time elapsed since timevar_start was called
 356    is attributed to it.  */
 357
 358 void
 359 timevar_stop (timevar_id_t timevar)
 360 {
 361   struct timevar_def *tv = &timevars[timevar];
 362   struct timevar_time_def now;
 363
 364   if (!timevar_enable)
 365     return;
 366
 367   /* TIMEVAR must have been started via timevar_start.  */
 368   gcc_assert (tv->standalone);
 369
 370   get_time (&now);
 371   timevar_accumulate (&tv->elapsed, &tv->start_time, &now);
 372 }
 373
 374 /* Fill the elapsed time for TIMEVAR into ELAPSED.  Returns
 375    update-to-date information even if TIMEVAR is currently running.  */
 376
 377 void
 378 timevar_get (timevar_id_t timevar, struct timevar_time_def *elapsed)
 379 {
 380   struct timevar_def *tv = &timevars[timevar];
 381   struct timevar_time_def now;
 382
 383   *elapsed = tv->elapsed;
 384
 385   /* Is TIMEVAR currently running as a standalone timer?  */
 386   if (tv->standalone)
 387     {
 388       get_time (&now);
 389       timevar_accumulate (elapsed, &tv->start_time, &now);
 390     }
 391   /* Or is TIMEVAR at the top of the timer stack?  */
 392   else if (stack->timevar == tv)
 393     {
 394       get_time (&now);
 395       timevar_accumulate (elapsed, &start_time, &now);
 396     }
 397 }
 398
 399 /* Summarize timing variables to FP.  The timing variable TV_TOTAL has
 400    a special meaning -- it's considered to be the total elapsed time,
 401    for normalizing the others, and is displayed last.  */
 402
 403 void
 404 timevar_print (FILE *fp)
 405 {
 406   /* Only print stuff if we have some sort of time information.  */
 407 #if defined (HAVE_USER_TIME) || defined (HAVE_SYS_TIME) || defined (HAVE_WALL_TIME)
 408   unsigned int /* timevar_id_t */ id;
 409   struct timevar_time_def *total = &timevars[TV_TOTAL].elapsed;
 410   struct timevar_time_def now;
 411
 412   if (!timevar_enable)
 413     return;
 414
 415   /* Update timing information in case we're calling this from GDB.  */
 416
 417   if (fp == 0)
 418     fp = stderr;
 419
 420   /* What time is it?  */
 421   get_time (&now);
 422
 423   /* If the stack isn't empty, attribute the current elapsed time to
 424      the old topmost element.  */
 425   if (stack)
 426     timevar_accumulate (&stack->timevar->elapsed, &start_time, &now);
 427
 428   /* Reset the start time; from now on, time is attributed to
 429      TIMEVAR.  */
 430   start_time = now;
 431
 432   fputs (_("\nExecution times (seconds)\n"), fp);
 433   for (id = 0; id < (unsigned int) TIMEVAR_LAST; ++id)
 434     {
 435       struct timevar_def *tv = &timevars[(timevar_id_t) id];
 436       const double tiny = 5e-3;
 437
 438       /* Don't print the total execution time here; that goes at the
 439          end.  */
 440       if ((timevar_id_t) id == TV_TOTAL)
 441         continue;
 442
 443       /* Don't print timing variables that were never used.  */
 444       if (!tv->used)
 445         continue;
 446
 447       /* Don't print timing variables if we're going to get a row of
 448          zeroes.  */
 449       if (tv->elapsed.user < tiny
 450           && tv->elapsed.sys < tiny
 451           && tv->elapsed.wall < tiny)
 452         continue;
 453
 454       /* The timing variable name.  */
 455       fprintf (fp, " %-22s:", tv->name);
 456
 457 #ifdef HAVE_USER_TIME
 458       /* Print user-mode time for this process.  */
 459       fprintf (fp, "%7.2f (%2.0f%%) usr",
 460                tv->elapsed.user,
 461                (total->user == 0 ? 0 : tv->elapsed.user / total->user) * 100);
 462 #endif /* HAVE_USER_TIME */
 463
 464 #ifdef HAVE_SYS_TIME
 465       /* Print system-mode time for this process.  */
 466       fprintf (fp, "%7.2f (%2.0f%%) sys",
 467                tv->elapsed.sys,
 468                (total->sys == 0 ? 0 : tv->elapsed.sys / total->sys) * 100);
 469 #endif /* HAVE_SYS_TIME */
 470
 471 #ifdef HAVE_WALL_TIME
 472       /* Print wall clock time elapsed.  */
 473       fprintf (fp, "%7.2f (%2.0f%%) wall",
 474                tv->elapsed.wall,
 475                (total->wall == 0 ? 0 : tv->elapsed.wall / total->wall) * 100);
 476 #endif /* HAVE_WALL_TIME */
 477
 478       putc ('\n', fp);
 479     }
 480
 481   /* Print total time.  */
 482   fputs (_(" TOTAL                 :"), fp);
 483 #ifdef HAVE_USER_TIME
 484   fprintf (fp, "%7.2f          ", total->user);
 485 #endif
 486 #ifdef HAVE_SYS_TIME
 487   fprintf (fp, "%7.2f          ", total->sys);
 488 #endif
 489 #ifdef HAVE_WALL_TIME
 490   fprintf (fp, "%7.2f\n", total->wall);
 491 #endif
 492
 493 #ifdef ENABLE_CHECKING
 494   fprintf (fp, "Extra diagnostic checks enabled; compiler may run slowly.\n");
 495   fprintf (fp, "Configure with --disable-checking to disable checks.\n");
 496 #endif
 497
 498 #endif /* defined (HAVE_USER_TIME) || defined (HAVE_SYS_TIME)
 499           || defined (HAVE_WALL_TIME) */
 500 }
 501
 502 /* Prints a message to stderr stating that time elapsed in STR is
 503    TOTAL (given in microseconds).  */
 504
 505 void
 506 print_time (const char *str, long total)
 507 {
 508   long all_time = get_run_time ();
 509   fprintf (stderr,
 510            _("time in %s: %ld.%06ld (%ld%%)\n"),
 511            str, total / 1000000, total % 1000000,
 512            all_time == 0 ? 0
 513            : (long) (((100.0 * (double) total) / (double) all_time) + .5));
 514 }