gprof/basic_blocks.c

   1 /*
   2  * Basic-block level related code: reading/writing of basic-block info
   3  * to/from gmon.out; computing and formatting of basic-block related
   4  * statistics.
   5  */
   6 #include <stdio.h>
   7 #include <unistd.h>
   8 #include "basic_blocks.h"
   9 #include "core.h"
  10 #include "gmon_io.h"
  11 #include "gmon_out.h"
  12 #include "gprof.h"
  13 #include "libiberty.h"
  14 #include "source.h"
  15 #include "sym_ids.h"
  16
  17
  18 /*
  19  * Default option values:
  20  */
  21 bool bb_annotate_all_lines = FALSE;
  22 int bb_min_calls = 1;
  23 int bb_table_length = 10;
  24
  25 /*
  26  * Variables used to compute annotated source listing stats:
  27  */
  28 static long num_executable_lines;
  29 static long num_lines_executed;
  30
  31
  32 /*
  33  * Helper for sorting.  Compares two symbols and returns result
  34  * such that sorting will be increasing according to filename, line
  35  * number, and address (in that order).
  36  */
  37
  38 static int
  39 DEFUN (cmp_bb, (lp, rp), const void *lp AND const void *rp)
  40 {
  41   int r;
  42   const Sym *left = *(const Sym **) lp;
  43   const Sym *right = *(const Sym **) rp;
  44
  45   if (left->file && right->file)
  46     {
  47       r = strcmp (left->file->name, right->file->name);
  48       if (r)
  49         {
  50           return r;
  51         }
  52
  53       if (left->line_num != right->line_num)
  54         {
  55           return left->line_num - right->line_num;
  56         }
  57     }
  58
  59   if (left->addr < right->addr)
  60     {
  61       return -1;
  62     }
  63   else if (left->addr > right->addr)
  64     {
  65       return 1;
  66     }
  67   else
  68     {
  69       return 0;
  70     }
  71 }
  72
  73
  74 /*
  75  * Helper for sorting.  Order basic blocks in decreasing number of
  76  * calls, ties are broken in increasing order of line numbers.
  77  */
  78 static int
  79 DEFUN (cmp_ncalls, (lp, rp), const void *lp AND const void *rp)
  80 {
  81   const Sym *left = *(const Sym **) lp;
  82   const Sym *right = *(const Sym **) rp;
  83
  84   if (!left)
  85     {
  86       return 1;
  87     }
  88   else if (!right)
  89     {
  90       return -1;
  91     }
  92
  93   if (right->ncalls != left->ncalls)
  94     {
  95       return right->ncalls - left->ncalls;
  96     }
  97
  98   return left->line_num - right->line_num;
  99 }
 100
 101
 102 /*
 103  * Skip over variable length string.
 104  */
 105 static void
 106 DEFUN (fskip_string, (fp), FILE * fp)
 107 {
 108   int ch;
 109
 110   while ((ch = fgetc (fp)) != EOF)
 111     {
 112       if (ch == '\0')
 113         {
 114           break;
 115         }
 116     }
 117 }
 118
 119
 120 /*
 121  * Read a basic-block record from file IFP.  FILENAME is the name
 122  * of file IFP and is provided for formatting error-messages only.
 123  */
 124 void
 125 DEFUN (bb_read_rec, (ifp, filename), FILE * ifp AND const char *filename)
 126 {
 127   int nblocks, b;
 128   bfd_vma addr;
 129   long ncalls;
 130   Sym *sym;
 131
 132   if (fread (&nblocks, sizeof (nblocks), 1, ifp) != 1)
 133     {
 134       fprintf (stderr, _("%s: %s: unexpected end of file\n"), whoami, filename);
 135       done (1);
 136     }
 137
 138   nblocks = bfd_get_32 (core_bfd, (bfd_byte *) & nblocks);
 139   if (gmon_file_version == 0)
 140     {
 141       fskip_string (ifp);
 142     }
 143
 144   for (b = 0; b < nblocks; ++b)
 145     {
 146       if (gmon_file_version == 0)
 147         {
 148           int line_num;
 149           /*
 150            * Version 0 had lots of extra stuff that we don't
 151            * care about anymore.
 152            */
 153           if ((fread (&ncalls, sizeof (ncalls), 1, ifp) != 1)
 154               || (fread (&addr, sizeof (addr), 1, ifp) != 1)
 155               || (fskip_string (ifp), FALSE)
 156               || (fskip_string (ifp), FALSE)
 157               || (fread (&line_num, sizeof (line_num), 1, ifp) != 1))
 158             {
 159               perror (filename);
 160               done (1);
 161             }
 162         }
 163       else
 164         {
 165           if (fread (&addr, sizeof (addr), 1, ifp) != 1
 166               || fread (&ncalls, sizeof (ncalls), 1, ifp) != 1)
 167             {
 168               perror (filename);
 169               done (1);
 170             }
 171         }
 172
 173       /*
 174        * Basic-block execution counts are meaningful only if we're
 175        * profiling at the line-by-line level:
 176        */
 177       if (line_granularity)
 178         {
 179
 180           /* convert from target to host endianness: */
 181
 182           addr = get_vma (core_bfd, (bfd_byte *) & addr);
 183           ncalls = bfd_get_32 (core_bfd, (bfd_byte *) &ncalls);
 184
 185           sym = sym_lookup (&symtab, addr);
 186
 187           if (sym)
 188             {
 189               int i;
 190
 191               DBG (BBDEBUG,
 192                    printf ("[bb_read_rec] 0x%lx->0x%lx (%s:%d) cnt=%ld\n",
 193                            addr, sym->addr, sym->name, sym->line_num, ncalls));
 194
 195               for (i = 0; i < NBBS; i++)
 196                 {
 197                   if (! sym->bb_addr[i] || sym->bb_addr[i] == addr)
 198                     {
 199                       sym->bb_addr[i] = addr;
 200                       sym->bb_calls[i] += ncalls;
 201                       break;
 202                     }
 203                 }
 204             }
 205         }
 206       else
 207         {
 208           static bool user_warned = FALSE;
 209
 210           if (!user_warned)
 211             {
 212               user_warned = TRUE;
 213               fprintf (stderr,
 214                        _("%s: warning: ignoring basic-block exec counts (use -l or --line)\n"),
 215                        whoami);
 216             }
 217         }
 218     }
 219   return;
 220 }
 221
 222
 223 /*
 224  * Write all basic-blocks with non-zero counts to file OFP.  FILENAME
 225  * is the name of OFP and is provided for producing error-messages
 226  * only.
 227  */
 228 void
 229 DEFUN (bb_write_blocks, (ofp, filename), FILE * ofp AND const char *filename)
 230 {
 231   const unsigned char tag = GMON_TAG_BB_COUNT;
 232   int nblocks = 0;
 233   bfd_vma addr;
 234   long ncalls;
 235   Sym *sym;
 236   int i;
 237
 238   /* count how many non-zero blocks with have: */
 239
 240   for (sym = symtab.base; sym < symtab.limit; ++sym)
 241     {
 242       for (i = 0; i < NBBS && sym->bb_addr[i]; i++)
 243         ;
 244       nblocks += i;
 245     }
 246
 247   /* write header: */
 248   bfd_put_32 (core_bfd, nblocks, (bfd_byte *) & nblocks);
 249   if (fwrite (&tag, sizeof (tag), 1, ofp) != 1
 250       || fwrite (&nblocks, sizeof (nblocks), 1, ofp) != 1)
 251     {
 252       perror (filename);
 253       done (1);
 254     }
 255
 256   /* write counts: */
 257   for (sym = symtab.base; sym < symtab.limit; ++sym)
 258     {
 259       for (i = 0; i < NBBS && sym->bb_addr[i]; i++)
 260         {
 261           put_vma (core_bfd, sym->bb_addr[i], (bfd_byte *) & addr);
 262           bfd_put_32 (core_bfd, sym->bb_calls[i], (bfd_byte *) & ncalls);
 263
 264           if (fwrite (&addr, sizeof (addr), 1, ofp) != 1
 265               || fwrite (&ncalls, sizeof (ncalls), 1, ofp) != 1)
 266             {
 267               perror (filename);
 268               done (1);
 269             }
 270         }
 271     }
 272 }
 273
 274
 275 /*
 276  * Output basic-block statistics in a format that is easily parseable.
 277  * Current the format is:
 278  *
 279  *      <filename>:<line-number>: (<function-name>:<bb-addr): <ncalls>
 280  */
 281 void
 282 DEFUN_VOID (print_exec_counts)
 283 {
 284   Sym **sorted_bbs, *sym;
 285   int i, j, len;
 286
 287   if (first_output)
 288     {
 289       first_output = FALSE;
 290     }
 291   else
 292     {
 293       printf ("\f\n");
 294     }
 295
 296   /* sort basic-blocks according to function name and line number: */
 297
 298   sorted_bbs = (Sym **) xmalloc (symtab.len * sizeof (sorted_bbs[0]));
 299   len = 0;
 300   for (sym = symtab.base; sym < symtab.limit; ++sym)
 301     {
 302       /*
 303        * Accept symbol if it's in the INCL_EXEC table
 304        * or there is no INCL_EXEC table
 305        *    and it does not appear in the EXCL_EXEC table.
 306        */
 307       if (sym_lookup (&syms[INCL_EXEC], sym->addr)
 308           || (syms[INCL_EXEC].len == 0
 309               && !sym_lookup (&syms[EXCL_EXEC], sym->addr)))
 310         {
 311           sorted_bbs[len++] = sym;
 312         }
 313     }
 314   qsort (sorted_bbs, len, sizeof (sorted_bbs[0]), cmp_bb);
 315
 316   /* output basic-blocks: */
 317
 318   for (i = 0; i < len; ++i)
 319     {
 320       if (sym->ncalls > 0 || ! ignore_zeros)
 321         {
 322           printf (_("%s:%d: (%s:0x%lx) %d executions\n"),
 323                   sym->file ? sym->file->name : _("<unknown>"), sym->line_num,
 324                   sym->name, sym->addr, sym->ncalls);
 325         }
 326       for (j = 0; j < NBBS && sym->bb_addr[j]; j ++)
 327         {
 328           if (sym->bb_calls[j] > 0 || ! ignore_zeros)
 329             {
 330               printf (_("%s:%d: (%s:0x%lx) %d executions\n"),
 331                       sym->file ? sym->file->name : _("<unknown>"), sym->line_num,
 332                       sym->name, sym->bb_addr[j], sym->bb_calls[j]);
 333             }
 334         }
 335     }
 336   free (sorted_bbs);
 337 }
 338
 339 /*
 340  * Helper for bb_annotated_source: format annotation containing
 341  * number of line executions.  Depends on being called on each
 342  * line of a file in sequential order.
 343  *
 344  * Global variable bb_annotate_all_lines enables execution count
 345  * compression (counts are supressed if identical to the last one)
 346  * and prints counts on all executed lines.  Otherwise, print
 347  * all basic-block execution counts exactly once on the line
 348  * that starts the basic-block.
 349  */
 350
 351 static void
 352 DEFUN (annotate_with_count, (buf, width, line_num, arg),
 353        char *buf AND int width AND int line_num AND void *arg)
 354 {
 355   Source_File *sf = arg;
 356   Sym *b;
 357   int i;
 358   static int last_count;
 359   int last_print=-1;
 360
 361   b = NULL;
 362   if (line_num <= sf->num_lines)
 363     {
 364       b = sf->line[line_num - 1];
 365     }
 366   if (!b)
 367     {
 368       for (i = 0; i < width; i++)
 369         buf[i] = ' ';
 370       buf[width] = '\0';
 371     }
 372   else
 373     {
 374       char tmpbuf[NBBS * 30];
 375       char *p;
 376       int ncalls;
 377       int len;
 378
 379       ++num_executable_lines;
 380
 381       p = tmpbuf;
 382       *p = '\0';
 383
 384       ncalls = -1;
 385
 386       /* If this is a function entry point, label the line no matter what.
 387        * Otherwise, we're in the middle of a function, so check to see
 388        * if the first basic-block address is larger than the starting
 389        * address of the line.  If so, then this line begins with a
 390        * a portion of the previous basic-block, so print that prior
 391        * execution count (if bb_annotate_all_lines is set).
 392        */
 393
 394       if (b->is_func)
 395         {
 396           sprintf (p, "%d", b->ncalls);
 397           p += strlen (p);
 398           last_count = b->ncalls;
 399           last_print = last_count;
 400           ncalls = b->ncalls;
 401         }
 402       else if (bb_annotate_all_lines
 403                && b->bb_addr[0] && b->bb_addr[0] > b->addr)
 404         {
 405           sprintf (p, "%d", last_count);
 406           p += strlen (p);
 407           last_print = last_count;
 408           ncalls = last_count;
 409         }
 410
 411       /* Loop through all of this line's basic-blocks.  For each one,
 412        * update last_count, then compress sequential identical counts
 413        * (if bb_annotate_all_lines) and print the execution count.
 414        */
 415
 416       for (i = 0; i < NBBS && b->bb_addr[i]; i++)
 417         {
 418           last_count = b->bb_calls[i];
 419           if (ncalls < 0)
 420             ncalls = 0;
 421           ncalls += last_count;
 422
 423           if (bb_annotate_all_lines && last_count == last_print)
 424             {
 425               continue;
 426             }
 427
 428           if (p > tmpbuf)
 429             *p++ = ',';
 430           sprintf (p, "%d", last_count);
 431           p += strlen (p);
 432
 433           last_print = last_count;
 434         }
 435
 436       /* We're done.  If nothing has been printed on this line,
 437        * print the last execution count (bb_annotate_all_lines),
 438        * which could be from either a previous line (if there were
 439        * no BBs on this line), or from this line (if all our BB
 440        * counts were compressed out because they were identical).
 441        */
 442
 443       if (bb_annotate_all_lines && p == tmpbuf)
 444         {
 445           sprintf (p, "%d", last_count);
 446           p += strlen (p);
 447           ncalls = last_count;
 448         }
 449
 450       if (ncalls < 0)
 451         {
 452           int c;
 453
 454           for (c = 0; c < width; c++)
 455             buf[c] = ' ';
 456           buf[width] = '\0';
 457           return;
 458         }
 459
 460       ++num_lines_executed;
 461
 462       if (ncalls < bb_min_calls)
 463         {
 464           strcpy (tmpbuf, "#####");
 465           p = tmpbuf + 5;
 466         }
 467
 468       strcpy (p, " -> ");
 469       p += 4;
 470
 471       len = p - tmpbuf;
 472       if (len >= width)
 473         {
 474           strncpy (buf, tmpbuf, width);
 475           buf[width] = '\0';
 476         }
 477       else
 478         {
 479           int c;
 480
 481           strcpy (buf + width - len, tmpbuf);
 482           for (c = 0; c < width - len; ++c)
 483             buf[c] = ' ';
 484         }
 485     }
 486 }
 487
 488 /*
 489  * Annotate the files named in SOURCE_FILES with basic-block statistics
 490  * (execution counts).  After each source files, a few statistics
 491  * regarding that source file are printed.
 492  */
 493 void
 494 DEFUN_VOID (print_annotated_source)
 495 {
 496   Sym *sym, *line_stats, *new_line;
 497   Source_File *sf;
 498   int i, table_len;
 499   FILE *ofp;
 500
 501   /*
 502    * Find maximum line number for each source file that user is
 503    * interested in:
 504    */
 505   for (sym = symtab.base; sym < symtab.limit; ++sym)
 506     {
 507       /*
 508        * Accept symbol if it's file is known, its line number is
 509        * bigger than anything we have seen for that file so far and
 510        * if it's in the INCL_ANNO table or there is no INCL_ANNO
 511        * table and it does not appear in the EXCL_ANNO table.
 512        */
 513       if (sym->file && sym->line_num > sym->file->num_lines
 514           && (sym_lookup (&syms[INCL_ANNO], sym->addr)
 515               || (syms[INCL_ANNO].len == 0
 516                   && !sym_lookup (&syms[EXCL_ANNO], sym->addr))))
 517         {
 518           sym->file->num_lines = sym->line_num;
 519         }
 520     }
 521
 522   /* allocate line descriptors: */
 523
 524   for (sf = first_src_file; sf; sf = sf->next)
 525     {
 526       if (sf->num_lines > 0)
 527         {
 528           sf->line = (void *) xmalloc (sf->num_lines * sizeof (sf->line[0]));
 529           memset (sf->line, 0, sf->num_lines * sizeof (sf->line[0]));
 530         }
 531     }
 532
 533   /* count executions per line: */
 534
 535   for (sym = symtab.base; sym < symtab.limit; ++sym)
 536     {
 537       if (sym->file && sym->file->num_lines
 538           && (sym_lookup (&syms[INCL_ANNO], sym->addr)
 539               || (syms[INCL_ANNO].len == 0
 540                   && !sym_lookup (&syms[EXCL_ANNO], sym->addr))))
 541         {
 542           sym->file->ncalls += sym->ncalls;
 543           line_stats = sym->file->line[sym->line_num - 1];
 544           if (!line_stats)
 545             {
 546               /* common case has at most one basic-block per source line: */
 547               sym->file->line[sym->line_num - 1] = sym;
 548             }
 549           else if (!line_stats->addr)
 550             {
 551               /* sym is the 3rd .. nth basic block for this line: */
 552               line_stats->ncalls += sym->ncalls;
 553             }
 554           else
 555             {
 556               /* sym is the second basic block for this line */
 557               new_line = (Sym *) xmalloc (sizeof (*new_line));
 558               *new_line = *line_stats;
 559               new_line->addr = 0;
 560               new_line->ncalls += sym->ncalls;
 561               sym->file->line[sym->line_num - 1] = new_line;
 562             }
 563         }
 564     }
 565
 566   /* plod over source files, annotating them: */
 567
 568   for (sf = first_src_file; sf; sf = sf->next)
 569     {
 570       if (!sf->num_lines || (ignore_zeros && sf->ncalls == 0))
 571         {
 572           continue;
 573         }
 574
 575       num_executable_lines = num_lines_executed = 0;
 576       ofp = annotate_source (sf, 16, annotate_with_count, sf);
 577       if (!ofp)
 578         {
 579           continue;
 580         }
 581
 582       if (bb_table_length > 0)
 583         {
 584           fprintf (ofp, _("\n\nTop %d Lines:\n\n     Line      Count\n\n"),
 585                    bb_table_length);
 586
 587           /* abuse line arrays---it's not needed anymore: */
 588           qsort (sf->line, sf->num_lines, sizeof (sf->line[0]), cmp_ncalls);
 589           table_len = bb_table_length;
 590           if (table_len > sf->num_lines)
 591             {
 592               table_len = sf->num_lines;
 593             }
 594           for (i = 0; i < table_len; ++i)
 595             {
 596               sym = sf->line[i];
 597               if (!sym || sym->ncalls <= 0)
 598                 {
 599                   break;
 600                 }
 601               fprintf (ofp, "%9d %10d\n", sym->line_num, sym->ncalls);
 602             }
 603         }
 604
 605       free (sf->line);
 606       sf->line = 0;
 607
 608       fprintf (ofp, _("\nExecution Summary:\n\n"));
 609       fprintf (ofp, _("%9ld   Executable lines in this file\n"),
 610                num_executable_lines);
 611       fprintf (ofp, _("%9ld   Lines executed\n"), num_lines_executed);
 612       fprintf (ofp, _("%9.2f   Percent of the file executed\n"),
 613                num_executable_lines
 614                ? 100.0 * num_lines_executed / (double) num_executable_lines
 615                : 100.0);
 616       fprintf (ofp, _("\n%9d   Total number of line executions\n"), sf->ncalls);
 617       fprintf (ofp, _("%9.2f   Average executions per line\n"),
 618                num_executable_lines
 619                ? sf->ncalls / (double) num_executable_lines
 620                : 0.0);
 621       if (ofp != stdout)
 622         {
 623           fclose (ofp);
 624         }
 625     }
 626 }