gcc/statistics.cc

   1 /* Optimization statistics functions.
   2    Copyright (C) 2008-2022 Free Software Foundation, Inc.
   3    Contributed by Richard Guenther  <rguenther@suse.de>
   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 3, 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 COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 #include "config.h"
  22 #include "system.h"
  23 #include "coretypes.h"
  24 #include "function.h"
  25 #include "tree-pass.h"
  26 #include "context.h"
  27 #include "pass_manager.h"
  28 #include "tree.h"
  29
  30 static int statistics_dump_nr;
  31 static dump_flags_t statistics_dump_flags;
  32 static FILE *statistics_dump_file;
  33
  34 /* Statistics entry.  A integer counter associated to a string ID
  35    and value.  */
  36
  37 struct statistics_counter {
  38   const char *id;
  39   int val;
  40   bool histogram_p;
  41   unsigned HOST_WIDE_INT count;
  42   unsigned HOST_WIDE_INT prev_dumped_count;
  43 };
  44
  45 /* Hashtable helpers.  */
  46
  47 struct stats_counter_hasher : pointer_hash <statistics_counter>
  48 {
  49   static inline hashval_t hash (const statistics_counter *);
  50   static inline bool equal (const statistics_counter *,
  51                             const statistics_counter *);
  52   static inline void remove (statistics_counter *);
  53 };
  54
  55 /* Hash a statistic counter by its string ID.  */
  56
  57 inline hashval_t
  58 stats_counter_hasher::hash (const statistics_counter *c)
  59 {
  60   return htab_hash_string (c->id) + c->val;
  61 }
  62
  63 /* Compare two statistic counters by their string IDs.  */
  64
  65 inline bool
  66 stats_counter_hasher::equal (const statistics_counter *c1,
  67                              const statistics_counter *c2)
  68 {
  69   return c1->val == c2->val && strcmp (c1->id, c2->id) == 0;
  70 }
  71
  72 /* Free a statistics entry.  */
  73
  74 inline void
  75 stats_counter_hasher::remove (statistics_counter *v)
  76 {
  77   free (CONST_CAST (char *, v->id));
  78   free (v);
  79 }
  80
  81 typedef hash_table<stats_counter_hasher> stats_counter_table_type;
  82
  83 /* Array of statistic hashes, indexed by pass id.  */
  84 static stats_counter_table_type **statistics_hashes;
  85 static unsigned nr_statistics_hashes;
  86
  87 /* Return the current hashtable to be used for recording or printing
  88    statistics.  */
  89
  90 static stats_counter_table_type *
  91 curr_statistics_hash (void)
  92 {
  93   unsigned idx;
  94
  95   gcc_assert (current_pass->static_pass_number >= 0);
  96   idx = current_pass->static_pass_number;
  97
  98   if (idx < nr_statistics_hashes
  99       && statistics_hashes[idx])
 100     return statistics_hashes[idx];
 101
 102   if (idx >= nr_statistics_hashes)
 103     {
 104       statistics_hashes = XRESIZEVEC (stats_counter_table_type *,
 105                                       statistics_hashes, idx+1);
 106       memset (statistics_hashes + nr_statistics_hashes, 0,
 107               (idx + 1 - nr_statistics_hashes)
 108               * sizeof (stats_counter_table_type *));
 109       nr_statistics_hashes = idx + 1;
 110     }
 111
 112   statistics_hashes[idx] = new stats_counter_table_type (15);
 113
 114   return statistics_hashes[idx];
 115 }
 116
 117 /* Helper function to return asmname or name of FN
 118    depending on whether asmname option is set.  */
 119
 120 static const char *
 121 get_function_name (struct function *fn)
 122 {
 123   if ((statistics_dump_flags & TDF_ASMNAME)
 124       && DECL_ASSEMBLER_NAME_SET_P (fn->decl))
 125     {
 126       tree asmname = decl_assembler_name (fn->decl);
 127       if (asmname)
 128         return IDENTIFIER_POINTER (asmname);
 129     }
 130   return function_name (fn);
 131 }
 132
 133 /* Helper for statistics_fini_pass.  Print the counter difference
 134    since the last dump for the pass dump files.  */
 135
 136 int
 137 statistics_fini_pass_1 (statistics_counter **slot,
 138                         void *data ATTRIBUTE_UNUSED)
 139 {
 140   statistics_counter *counter = *slot;
 141   unsigned HOST_WIDE_INT count = counter->count - counter->prev_dumped_count;
 142   if (count == 0)
 143     return 1;
 144   if (counter->histogram_p)
 145     fprintf (dump_file, "%s == %d: " HOST_WIDE_INT_PRINT_DEC "\n",
 146              counter->id, counter->val, count);
 147   else
 148     fprintf (dump_file, "%s: " HOST_WIDE_INT_PRINT_DEC "\n",
 149              counter->id, count);
 150   counter->prev_dumped_count = counter->count;
 151   return 1;
 152 }
 153
 154 /* Helper for statistics_fini_pass.  Print the counter difference
 155    since the last dump for the statistics dump.  */
 156
 157 int
 158 statistics_fini_pass_2 (statistics_counter **slot,
 159                         void *data ATTRIBUTE_UNUSED)
 160 {
 161   statistics_counter *counter = *slot;
 162   unsigned HOST_WIDE_INT count = counter->count - counter->prev_dumped_count;
 163   if (count == 0)
 164     return 1;
 165   counter->prev_dumped_count = counter->count;
 166   if (counter->histogram_p)
 167     fprintf (statistics_dump_file,
 168              "%d %s \"%s == %d\" \"%s\" " HOST_WIDE_INT_PRINT_DEC "\n",
 169              current_pass->static_pass_number,
 170              current_pass->name,
 171              counter->id, counter->val,
 172              get_function_name (cfun),
 173              count);
 174   else
 175     fprintf (statistics_dump_file,
 176              "%d %s \"%s\" \"%s\" " HOST_WIDE_INT_PRINT_DEC "\n",
 177              current_pass->static_pass_number,
 178              current_pass->name,
 179              counter->id,
 180              get_function_name (cfun),
 181              count);
 182   counter->prev_dumped_count = counter->count;
 183   return 1;
 184 }
 185
 186 /* Helper for statistics_fini_pass, reset the counters.  */
 187
 188 int
 189 statistics_fini_pass_3 (statistics_counter **slot,
 190                         void *data ATTRIBUTE_UNUSED)
 191 {
 192   statistics_counter *counter = *slot;
 193   counter->prev_dumped_count = counter->count;
 194   return 1;
 195 }
 196
 197 /* Dump the current statistics incrementally.  */
 198
 199 void
 200 statistics_fini_pass (void)
 201 {
 202   if (current_pass->static_pass_number == -1)
 203     return;
 204
 205   if (dump_file
 206       && dump_flags & TDF_STATS)
 207     {
 208       fprintf (dump_file, "\n");
 209       fprintf (dump_file, "Pass statistics of \"%s\": ", current_pass->name);
 210       fprintf (dump_file, "----------------\n");
 211       curr_statistics_hash ()
 212         ->traverse_noresize <void *, statistics_fini_pass_1> (NULL);
 213       fprintf (dump_file, "\n");
 214     }
 215   if (statistics_dump_file
 216       && !(statistics_dump_flags & TDF_STATS
 217            || statistics_dump_flags & TDF_DETAILS))
 218     curr_statistics_hash ()
 219       ->traverse_noresize <void *, statistics_fini_pass_2> (NULL);
 220   curr_statistics_hash ()
 221     ->traverse_noresize <void *, statistics_fini_pass_3> (NULL);
 222 }
 223
 224 /* Helper for printing summary information.  */
 225
 226 int
 227 statistics_fini_1 (statistics_counter **slot, opt_pass *pass)
 228 {
 229   statistics_counter *counter = *slot;
 230   if (counter->count == 0)
 231     return 1;
 232   if (counter->histogram_p)
 233     fprintf (statistics_dump_file,
 234              "%d %s \"%s == %d\" " HOST_WIDE_INT_PRINT_DEC "\n",
 235              pass->static_pass_number,
 236              pass->name,
 237              counter->id, counter->val,
 238              counter->count);
 239   else
 240     fprintf (statistics_dump_file,
 241              "%d %s \"%s\" " HOST_WIDE_INT_PRINT_DEC "\n",
 242              pass->static_pass_number,
 243              pass->name,
 244              counter->id,
 245              counter->count);
 246   return 1;
 247 }
 248
 249 /* Finish the statistics and dump summary information.  */
 250
 251 void
 252 statistics_fini (void)
 253 {
 254   gcc::pass_manager *passes = g->get_passes ();
 255   if (!statistics_dump_file)
 256     return;
 257
 258   if (statistics_dump_flags & TDF_STATS)
 259     {
 260       unsigned i;
 261       for (i = 0; i < nr_statistics_hashes; ++i)
 262         if (statistics_hashes[i]
 263             && passes->get_pass_for_id (i) != NULL)
 264           statistics_hashes[i]
 265             ->traverse_noresize <opt_pass *, statistics_fini_1>
 266             (passes->get_pass_for_id (i));
 267     }
 268
 269   dump_end (statistics_dump_nr, statistics_dump_file);
 270 }
 271
 272 /* Register the statistics dump file.  */
 273
 274 void
 275 statistics_early_init (void)
 276 {
 277   gcc::dump_manager *dumps = g->get_dumps ();
 278   statistics_dump_nr = dumps->dump_register (".statistics", "statistics",
 279                                              "statistics", DK_tree,
 280                                              OPTGROUP_NONE,
 281                                              false);
 282 }
 283
 284 /* Init the statistics.  */
 285
 286 void
 287 statistics_init (void)
 288 {
 289   gcc::dump_manager *dumps = g->get_dumps ();
 290   statistics_dump_file = dump_begin (statistics_dump_nr, NULL);
 291   statistics_dump_flags = dumps->get_dump_file_info (statistics_dump_nr)->pflags;
 292 }
 293
 294 /* Lookup or add a statistics counter in the hashtable HASH with ID, VAL
 295    and HISTOGRAM_P.  */
 296
 297 static statistics_counter *
 298 lookup_or_add_counter (stats_counter_table_type *hash, const char *id, int val,
 299                        bool histogram_p)
 300 {
 301   statistics_counter **counter;
 302   statistics_counter c;
 303   c.id = id;
 304   c.val = val;
 305   counter = hash->find_slot (&c, INSERT);
 306   if (!*counter)
 307     {
 308       *counter = XNEW (statistics_counter);
 309       (*counter)->id = xstrdup (id);
 310       (*counter)->val = val;
 311       (*counter)->histogram_p = histogram_p;
 312       (*counter)->prev_dumped_count = 0;
 313       (*counter)->count = 0;
 314     }
 315   return *counter;
 316 }
 317
 318 /* Add statistics information about event ID in function FN.
 319    This will increment the counter associated with ID by INCR.
 320    It will also dump the event to the global statistics file if requested.  */
 321
 322 void
 323 statistics_counter_event (struct function *fn, const char *id, int incr)
 324 {
 325   statistics_counter *counter;
 326
 327   if ((!(dump_flags & TDF_STATS)
 328        && !statistics_dump_file)
 329       || incr == 0)
 330     return;
 331
 332   if (current_pass
 333       && current_pass->static_pass_number != -1)
 334     {
 335       counter = lookup_or_add_counter (curr_statistics_hash (), id, 0, false);
 336       gcc_assert (!counter->histogram_p);
 337       counter->count += incr;
 338     }
 339
 340   if (!statistics_dump_file
 341       || !(statistics_dump_flags & TDF_DETAILS))
 342     return;
 343
 344   fprintf (statistics_dump_file,
 345            "%d %s \"%s\" \"%s\" %d\n",
 346            current_pass ? current_pass->static_pass_number : -1,
 347            current_pass ? current_pass->name : "none",
 348            id,
 349            get_function_name (fn),
 350            incr);
 351 }
 352
 353 /* Add statistics information about event ID in function FN with the
 354    histogram value VAL.
 355    It will dump the event to the global statistics file if requested.  */
 356
 357 void
 358 statistics_histogram_event (struct function *fn, const char *id, int val)
 359 {
 360   statistics_counter *counter;
 361
 362   if (!(dump_flags & TDF_STATS)
 363       && !statistics_dump_file)
 364     return;
 365
 366   counter = lookup_or_add_counter (curr_statistics_hash (), id, val, true);
 367   gcc_assert (counter->histogram_p);
 368   counter->count += 1;
 369
 370   if (!statistics_dump_file
 371       || !(statistics_dump_flags & TDF_DETAILS))
 372     return;
 373
 374   fprintf (statistics_dump_file,
 375            "%d %s \"%s == %d\" \"%s\" 1\n",
 376            current_pass->static_pass_number,
 377            current_pass->name,
 378            id, val,
 379            get_function_name (fn));
 380 }