gprof/basic_blocks.c

   1 /* basic_blocks.c  -  Basic-block level related code: reading/writing
   2    of basic-block info to/from gmon.out; computing and formatting of
   3    basic-block related statistics.
   4
   5    Copyright 2000, 2001, 2002 Free Software Foundation, Inc.
   6
   7    This file is part of GNU Binutils.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  22    02111-1307, USA.  */
  23 \f
  24 #include "libiberty.h"
  25 #include "gprof.h"
  26 #include "basic_blocks.h"
  27 #include "corefile.h"
  28 #include "gmon_io.h"
  29 #include "gmon_out.h"
  30 #include "search_list.h"
  31 #include "source.h"
  32 #include "symtab.h"
  33 #include "sym_ids.h"
  34
  35 static int cmp_bb (const PTR, const PTR);
  36 static int cmp_ncalls (const PTR, const PTR);
  37 static void fskip_string (FILE *);
  38 static void annotate_with_count (char *, unsigned int, int, PTR);
  39
  40 /* Default option values:  */
  41 bfd_boolean bb_annotate_all_lines = FALSE;
  42 unsigned long bb_min_calls = 1;
  43 int bb_table_length = 10;
  44
  45 /* Variables used to compute annotated source listing stats:  */
  46 static long num_executable_lines;
  47 static long num_lines_executed;
  48
  49
  50 /* Helper for sorting.  Compares two symbols and returns result
  51    such that sorting will be increasing according to filename, line
  52    number, and address (in that order).  */
  53
  54 static int
  55 cmp_bb (const PTR lp, const PTR rp)
  56 {
  57   int r;
  58   const Sym *left = *(const Sym **) lp;
  59   const Sym *right = *(const Sym **) rp;
  60
  61   if (left->file && right->file)
  62     {
  63       r = strcmp (left->file->name, right->file->name);
  64
  65       if (r)
  66         return r;
  67
  68       if (left->line_num != right->line_num)
  69         return left->line_num - right->line_num;
  70     }
  71
  72   if (left->addr < right->addr)
  73     return -1;
  74   else if (left->addr > right->addr)
  75     return 1;
  76   else
  77     return 0;
  78 }
  79
  80
  81 /* Helper for sorting.  Order basic blocks in decreasing number of
  82    calls, ties are broken in increasing order of line numbers.  */
  83 static int
  84 cmp_ncalls (const PTR lp, const PTR rp)
  85 {
  86   const Sym *left = *(const Sym **) lp;
  87   const Sym *right = *(const Sym **) rp;
  88
  89   if (!left)
  90     return 1;
  91   else if (!right)
  92     return -1;
  93
  94   if (left->ncalls < right->ncalls)
  95     return 1;
  96   else if (left->ncalls > right->ncalls)
  97     return -1;
  98
  99   return left->line_num - right->line_num;
 100 }
 101
 102 /* Skip over variable length string.  */
 103 static void
 104 fskip_string (FILE *fp)
 105 {
 106   int ch;
 107
 108   while ((ch = fgetc (fp)) != EOF)
 109     {
 110       if (ch == '\0')
 111         break;
 112     }
 113 }
 114
 115 /* Read a basic-block record from file IFP.  FILENAME is the name
 116    of file IFP and is provided for formatting error-messages only.  */
 117
 118 void
 119 bb_read_rec (FILE *ifp, const char *filename)
 120 {
 121   int nblocks, b;
 122   bfd_vma addr, ncalls;
 123   Sym *sym;
 124
 125   if (gmon_io_read_32 (ifp, &nblocks))
 126     {
 127       fprintf (stderr, _("%s: %s: unexpected end of file\n"),
 128                whoami, filename);
 129       done (1);
 130     }
 131
 132   nblocks = bfd_get_32 (core_bfd, (bfd_byte *) & nblocks);
 133   if (gmon_file_version == 0)
 134     fskip_string (ifp);
 135
 136   for (b = 0; b < nblocks; ++b)
 137     {
 138       if (gmon_file_version == 0)
 139         {
 140           int line_num;
 141
 142           /* Version 0 had lots of extra stuff that we don't
 143              care about anymore.  */
 144           if ((fread (&ncalls, sizeof (ncalls), 1, ifp) != 1)
 145               || (fread (&addr, sizeof (addr), 1, ifp) != 1)
 146               || (fskip_string (ifp), FALSE)
 147               || (fskip_string (ifp), FALSE)
 148               || (fread (&line_num, sizeof (line_num), 1, ifp) != 1))
 149             {
 150               perror (filename);
 151               done (1);
 152             }
 153         }
 154       else if (gmon_io_read_vma (ifp, &addr)
 155                || gmon_io_read_vma (ifp, &ncalls))
 156         {
 157           perror (filename);
 158           done (1);
 159         }
 160
 161       /* Basic-block execution counts are meaningful only if we're
 162          profiling at the line-by-line level:  */
 163       if (line_granularity)
 164         {
 165           sym = sym_lookup (&symtab, addr);
 166
 167           if (sym)
 168             {
 169               int i;
 170
 171               DBG (BBDEBUG,
 172                    printf ("[bb_read_rec] 0x%lx->0x%lx (%s:%d) cnt=%lu\n",
 173                            (unsigned long) addr, (unsigned long) sym->addr,
 174                            sym->name, sym->line_num, (unsigned long) ncalls));
 175
 176               for (i = 0; i < NBBS; i++)
 177                 {
 178                   if (! sym->bb_addr[i] || sym->bb_addr[i] == addr)
 179                     {
 180                       sym->bb_addr[i] = addr;
 181                       sym->bb_calls[i] += ncalls;
 182                       break;
 183                     }
 184                 }
 185             }
 186         }
 187       else
 188         {
 189           static bfd_boolean user_warned = FALSE;
 190
 191           if (!user_warned)
 192             {
 193               user_warned = TRUE;
 194               fprintf (stderr,
 195   _("%s: warning: ignoring basic-block exec counts (use -l or --line)\n"),
 196                        whoami);
 197             }
 198         }
 199     }
 200   return;
 201 }
 202
 203 /* Write all basic-blocks with non-zero counts to file OFP.  FILENAME
 204    is the name of OFP and is provided for producing error-messages
 205    only.  */
 206 void
 207 bb_write_blocks (FILE *ofp, const char *filename)
 208 {
 209   unsigned int nblocks = 0;
 210   Sym *sym;
 211   int i;
 212
 213   /* Count how many non-zero blocks with have:  */
 214   for (sym = symtab.base; sym < symtab.limit; ++sym)
 215     {
 216       for (i = 0; i < NBBS && sym->bb_addr[i]; i++)
 217         ;
 218       nblocks += i;
 219     }
 220
 221   /* Write header:  */
 222   if (gmon_io_write_8 (ofp, GMON_TAG_BB_COUNT)
 223       || gmon_io_write_32 (ofp, nblocks))
 224     {
 225       perror (filename);
 226       done (1);
 227     }
 228
 229   /* Write counts:  */
 230   for (sym = symtab.base; sym < symtab.limit; ++sym)
 231     {
 232       for (i = 0; i < NBBS && sym->bb_addr[i]; i++)
 233         {
 234           if (gmon_io_write_vma (ofp, sym->bb_addr[i])
 235               || gmon_io_write_vma (ofp, (bfd_vma) sym->bb_calls[i]))
 236             {
 237               perror (filename);
 238               done (1);
 239             }
 240         }
 241     }
 242 }
 243
 244 /* Output basic-block statistics in a format that is easily parseable.
 245    Current the format is:
 246
 247         <filename>:<line-number>: (<function-name>:<bb-addr): <ncalls>  */
 248
 249 void
 250 print_exec_counts ()
 251 {
 252   Sym **sorted_bbs, *sym;
 253   unsigned int i, j, len;
 254
 255   if (first_output)
 256     first_output = FALSE;
 257   else
 258     printf ("\f\n");
 259
 260   /* Sort basic-blocks according to function name and line number:  */
 261   sorted_bbs = (Sym **) xmalloc (symtab.len * sizeof (sorted_bbs[0]));
 262   len = 0;
 263
 264   for (sym = symtab.base; sym < symtab.limit; ++sym)
 265     {
 266       /* Accept symbol if it's in the INCL_EXEC table
 267          or there is no INCL_EXEC table
 268          and it does not appear in the EXCL_EXEC table.  */
 269       if (sym_lookup (&syms[INCL_EXEC], sym->addr)
 270           || (syms[INCL_EXEC].len == 0
 271               && !sym_lookup (&syms[EXCL_EXEC], sym->addr)))
 272         {
 273           sorted_bbs[len++] = sym;
 274         }
 275     }
 276
 277   qsort (sorted_bbs, len, sizeof (sorted_bbs[0]), cmp_bb);
 278
 279   /* Output basic-blocks:  */
 280
 281   for (i = 0; i < len; ++i)
 282     {
 283       if (sym->ncalls > 0 || ! ignore_zeros)
 284         {
 285           /* FIXME: This only works if bfd_vma is unsigned long.  */
 286           printf (_("%s:%d: (%s:0x%lx) %lu executions\n"),
 287                   sym->file ? sym->file->name : _("<unknown>"), sym->line_num,
 288                   sym->name, (unsigned long) sym->addr, sym->ncalls);
 289         }
 290
 291       for (j = 0; j < NBBS && sym->bb_addr[j]; j ++)
 292         {
 293           if (sym->bb_calls[j] > 0 || ! ignore_zeros)
 294             {
 295               /* FIXME: This only works if bfd_vma is unsigned long.  */
 296               printf (_("%s:%d: (%s:0x%lx) %lu executions\n"),
 297                       sym->file ? sym->file->name : _("<unknown>"), sym->line_num,
 298                       sym->name, (unsigned long) sym->bb_addr[j],
 299                       sym->bb_calls[j]);
 300             }
 301         }
 302     }
 303   free (sorted_bbs);
 304 }
 305
 306 /* Helper for bb_annotated_source: format annotation containing
 307    number of line executions.  Depends on being called on each
 308    line of a file in sequential order.
 309
 310    Global variable bb_annotate_all_lines enables execution count
 311    compression (counts are supressed if identical to the last one)
 312    and prints counts on all executed lines.  Otherwise, print
 313    all basic-block execution counts exactly once on the line
 314    that starts the basic-block.  */
 315
 316 static void
 317 annotate_with_count (char *buf, unsigned int width, int line_num, PTR arg)
 318 {
 319   Source_File *sf = arg;
 320   Sym *b;
 321   unsigned int i;
 322   static unsigned long last_count;
 323   unsigned long last_print = (unsigned long) -1;
 324
 325   b = NULL;
 326
 327   if (line_num <= sf->num_lines)
 328     b = sf->line[line_num - 1];
 329
 330   if (!b)
 331     {
 332       for (i = 0; i < width; i++)
 333         buf[i] = ' ';
 334       buf[width] = '\0';
 335     }
 336   else
 337     {
 338       char tmpbuf[NBBS * 30];
 339       char *p;
 340       unsigned long ncalls;
 341       int ncalls_set;
 342       unsigned int len;
 343
 344       ++num_executable_lines;
 345
 346       p = tmpbuf;
 347       *p = '\0';
 348
 349       ncalls = 0;
 350       ncalls_set = 0;
 351
 352       /* If this is a function entry point, label the line no matter what.
 353          Otherwise, we're in the middle of a function, so check to see
 354          if the first basic-block address is larger than the starting
 355          address of the line.  If so, then this line begins with a
 356          a portion of the previous basic-block, so print that prior
 357          execution count (if bb_annotate_all_lines is set).  */
 358       if (b->is_func)
 359         {
 360           sprintf (p, "%lu", b->ncalls);
 361           p += strlen (p);
 362           last_count = b->ncalls;
 363           last_print = last_count;
 364           ncalls = b->ncalls;
 365           ncalls_set = 1;
 366         }
 367       else if (bb_annotate_all_lines
 368                && b->bb_addr[0] && b->bb_addr[0] > b->addr)
 369         {
 370           sprintf (p, "%lu", last_count);
 371           p += strlen (p);
 372           last_print = last_count;
 373           ncalls = last_count;
 374           ncalls_set = 1;
 375         }
 376
 377       /* Loop through all of this line's basic-blocks.  For each one,
 378          update last_count, then compress sequential identical counts
 379          (if bb_annotate_all_lines) and print the execution count.  */
 380
 381       for (i = 0; i < NBBS && b->bb_addr[i]; i++)
 382         {
 383           last_count = b->bb_calls[i];
 384           if (! ncalls_set)
 385             {
 386               ncalls = 0;
 387               ncalls_set = 1;
 388             }
 389           ncalls += last_count;
 390
 391           if (bb_annotate_all_lines && last_count == last_print)
 392             continue;
 393
 394           if (p > tmpbuf)
 395             *p++ = ',';
 396           sprintf (p, "%lu", last_count);
 397           p += strlen (p);
 398
 399           last_print = last_count;
 400         }
 401
 402       /* We're done.  If nothing has been printed on this line,
 403          print the last execution count (bb_annotate_all_lines),
 404          which could be from either a previous line (if there were
 405          no BBs on this line), or from this line (if all our BB
 406          counts were compressed out because they were identical).  */
 407
 408       if (bb_annotate_all_lines && p == tmpbuf)
 409         {
 410           sprintf (p, "%lu", last_count);
 411           p += strlen (p);
 412           ncalls = last_count;
 413           ncalls_set = 1;
 414         }
 415
 416       if (! ncalls_set)
 417         {
 418           unsigned int c;
 419
 420           for (c = 0; c < width; c++)
 421             buf[c] = ' ';
 422           buf[width] = '\0';
 423           return;
 424         }
 425
 426       ++num_lines_executed;
 427
 428       if (ncalls < bb_min_calls)
 429         {
 430           strcpy (tmpbuf, "#####");
 431           p = tmpbuf + 5;
 432         }
 433
 434       strcpy (p, " -> ");
 435       p += 4;
 436
 437       len = p - tmpbuf;
 438       if (len >= width)
 439         {
 440           strncpy (buf, tmpbuf, width);
 441           buf[width] = '\0';
 442         }
 443       else
 444         {
 445           unsigned int c;
 446
 447           strcpy (buf + width - len, tmpbuf);
 448           for (c = 0; c < width - len; ++c)
 449             buf[c] = ' ';
 450         }
 451     }
 452 }
 453
 454 /* Annotate the files named in SOURCE_FILES with basic-block statistics
 455    (execution counts).  After each source files, a few statistics
 456    regarding that source file are printed.  */
 457
 458 void
 459 print_annotated_source ()
 460 {
 461   Sym *sym, *line_stats, *new_line;
 462   Source_File *sf;
 463   int i, table_len;
 464   FILE *ofp;
 465
 466   /* Find maximum line number for each source file that user is
 467      interested in:  */
 468   for (sym = symtab.base; sym < symtab.limit; ++sym)
 469     {
 470       /* Accept symbol if it's file is known, its line number is
 471          bigger than anything we have seen for that file so far and
 472          if it's in the INCL_ANNO table or there is no INCL_ANNO
 473          table and it does not appear in the EXCL_ANNO table.  */
 474       if (sym->file && sym->line_num > sym->file->num_lines
 475           && (sym_lookup (&syms[INCL_ANNO], sym->addr)
 476               || (syms[INCL_ANNO].len == 0
 477                   && !sym_lookup (&syms[EXCL_ANNO], sym->addr))))
 478         {
 479           sym->file->num_lines = sym->line_num;
 480         }
 481     }
 482
 483   /* Allocate line descriptors:  */
 484   for (sf = first_src_file; sf; sf = sf->next)
 485     {
 486       if (sf->num_lines > 0)
 487         {
 488           sf->line = (void *) xmalloc (sf->num_lines * sizeof (sf->line[0]));
 489           memset (sf->line, 0, sf->num_lines * sizeof (sf->line[0]));
 490         }
 491     }
 492
 493   /* Count executions per line:  */
 494   for (sym = symtab.base; sym < symtab.limit; ++sym)
 495     {
 496       if (sym->file && sym->file->num_lines
 497           && (sym_lookup (&syms[INCL_ANNO], sym->addr)
 498               || (syms[INCL_ANNO].len == 0
 499                   && !sym_lookup (&syms[EXCL_ANNO], sym->addr))))
 500         {
 501           sym->file->ncalls += sym->ncalls;
 502           line_stats = sym->file->line[sym->line_num - 1];
 503
 504           if (!line_stats)
 505             {
 506               /* Common case has at most one basic-block per source line:  */
 507               sym->file->line[sym->line_num - 1] = sym;
 508             }
 509           else if (!line_stats->addr)
 510             {
 511               /* sym is the 3rd .. nth basic block for this line:  */
 512               line_stats->ncalls += sym->ncalls;
 513             }
 514           else
 515             {
 516               /* sym is the second basic block for this line.  */
 517               new_line = (Sym *) xmalloc (sizeof (*new_line));
 518               *new_line = *line_stats;
 519               new_line->addr = 0;
 520               new_line->ncalls += sym->ncalls;
 521               sym->file->line[sym->line_num - 1] = new_line;
 522             }
 523         }
 524     }
 525
 526   /* Plod over source files, annotating them:  */
 527   for (sf = first_src_file; sf; sf = sf->next)
 528     {
 529       if (!sf->num_lines || (ignore_zeros && sf->ncalls == 0))
 530         continue;
 531
 532       num_executable_lines = num_lines_executed = 0;
 533
 534       ofp = annotate_source (sf, 16, annotate_with_count, sf);
 535       if (!ofp)
 536         continue;
 537
 538       if (bb_table_length > 0)
 539         {
 540           fprintf (ofp, _("\n\nTop %d Lines:\n\n     Line      Count\n\n"),
 541                    bb_table_length);
 542
 543           /* Abuse line arrays---it's not needed anymore:  */
 544           qsort (sf->line, sf->num_lines, sizeof (sf->line[0]), cmp_ncalls);
 545           table_len = bb_table_length;
 546
 547           if (table_len > sf->num_lines)
 548             table_len = sf->num_lines;
 549
 550           for (i = 0; i < table_len; ++i)
 551             {
 552               sym = sf->line[i];
 553
 554               if (!sym || sym->ncalls == 0)
 555                   break;
 556
 557               fprintf (ofp, "%9d %10lu\n", sym->line_num, sym->ncalls);
 558             }
 559         }
 560
 561       free (sf->line);
 562       sf->line = 0;
 563
 564       fprintf (ofp, _("\nExecution Summary:\n\n"));
 565       fprintf (ofp, _("%9ld   Executable lines in this file\n"),
 566                num_executable_lines);
 567       fprintf (ofp, _("%9ld   Lines executed\n"), num_lines_executed);
 568       fprintf (ofp, _("%9.2f   Percent of the file executed\n"),
 569                num_executable_lines
 570                ? 100.0 * num_lines_executed / (double) num_executable_lines
 571                : 100.0);
 572       fprintf (ofp, _("\n%9lu   Total number of line executions\n"),
 573                sf->ncalls);
 574       fprintf (ofp, _("%9.2f   Average executions per line\n"),
 575                num_executable_lines
 576                ? (double) sf->ncalls / (double) num_executable_lines
 577                : 0.0);
 578
 579       if (ofp != stdout)
 580         fclose (ofp);
 581     }
 582 }