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[/] [open8_urisc/] [trunk/] [gnu/] [binutils/] [gprof/] [basic_blocks.c] - Blame information for rev 309

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/* 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 1999, 2000, 2001, 2002, 2004, 2005, 2007
6
   Free Software Foundation, Inc.
7
 
8
   This file is part of GNU Binutils.
9
 
10
   This program is free software; you can redistribute it and/or modify
11
   it under the terms of the GNU General Public License as published by
12
   the Free Software Foundation; either version 3 of the License, or
13
   (at your option) any later version.
14
 
15
   This program is distributed in the hope that it will be useful,
16
   but WITHOUT ANY WARRANTY; without even the implied warranty of
17
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18
   GNU General Public License for more details.
19
 
20
   You should have received a copy of the GNU General Public License
21
   along with this program; if not, write to the Free Software
22
   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
23
   02110-1301, USA.  */
24
 
25
#include "gprof.h"
26
#include "libiberty.h"
27
#include "filenames.h"
28
#include "basic_blocks.h"
29
#include "corefile.h"
30
#include "gmon_io.h"
31
#include "gmon_out.h"
32
#include "search_list.h"
33
#include "source.h"
34
#include "symtab.h"
35
#include "sym_ids.h"
36
 
37
static int cmp_bb (const PTR, const PTR);
38
static int cmp_ncalls (const PTR, const PTR);
39
static void fskip_string (FILE *);
40
static void annotate_with_count (char *, unsigned int, int, PTR);
41
 
42
/* Default option values:  */
43
bfd_boolean bb_annotate_all_lines = FALSE;
44
unsigned long bb_min_calls = 1;
45
int bb_table_length = 10;
46
 
47
/* Variables used to compute annotated source listing stats:  */
48
static long num_executable_lines;
49
static long num_lines_executed;
50
 
51
 
52
/* Helper for sorting.  Compares two symbols and returns result
53
   such that sorting will be increasing according to filename, line
54
   number, and address (in that order).  */
55
 
56
static int
57
cmp_bb (const PTR lp, const PTR rp)
58
{
59
  int r;
60
  const Sym *left = *(const Sym **) lp;
61
  const Sym *right = *(const Sym **) rp;
62
 
63
  if (left->file && right->file)
64
    {
65
      r = filename_cmp (left->file->name, right->file->name);
66
 
67
      if (r)
68
        return r;
69
 
70
      if (left->line_num != right->line_num)
71
        return left->line_num - right->line_num;
72
    }
73
 
74
  if (left->addr < right->addr)
75
    return -1;
76
  else if (left->addr > right->addr)
77
    return 1;
78
  else
79
    return 0;
80
}
81
 
82
 
83
/* Helper for sorting.  Order basic blocks in decreasing number of
84
   calls, ties are broken in increasing order of line numbers.  */
85
static int
86
cmp_ncalls (const PTR lp, const PTR rp)
87
{
88
  const Sym *left = *(const Sym **) lp;
89
  const Sym *right = *(const Sym **) rp;
90
 
91
  if (!left)
92
    return 1;
93
  else if (!right)
94
    return -1;
95
 
96
  if (left->ncalls < right->ncalls)
97
    return 1;
98
  else if (left->ncalls > right->ncalls)
99
    return -1;
100
 
101
  return left->line_num - right->line_num;
102
}
103
 
104
/* Skip over variable length string.  */
105
static void
106
fskip_string (FILE *fp)
107
{
108
  int ch;
109
 
110
  while ((ch = fgetc (fp)) != EOF)
111
    {
112
      if (ch == '\0')
113
        break;
114
    }
115
}
116
 
117
/* Read a basic-block record from file IFP.  FILENAME is the name
118
   of file IFP and is provided for formatting error-messages only.  */
119
 
120
void
121
bb_read_rec (FILE *ifp, const char *filename)
122
{
123
  unsigned int nblocks, b;
124
  bfd_vma addr, ncalls;
125
  Sym *sym;
126
 
127
  if (gmon_io_read_32 (ifp, &nblocks))
128
    {
129
      fprintf (stderr, _("%s: %s: unexpected end of file\n"),
130
               whoami, filename);
131
      done (1);
132
    }
133
 
134
  nblocks = bfd_get_32 (core_bfd, (bfd_byte *) & nblocks);
135
  if (gmon_file_version == 0)
136
    fskip_string (ifp);
137
 
138
  for (b = 0; b < nblocks; ++b)
139
    {
140
      if (gmon_file_version == 0)
141
        {
142
          int line_num;
143
 
144
          /* Version 0 had lots of extra stuff that we don't
145
             care about anymore.  */
146
          if ((fread (&ncalls, sizeof (ncalls), 1, ifp) != 1)
147
              || (fread (&addr, sizeof (addr), 1, ifp) != 1)
148
              || (fskip_string (ifp), FALSE)
149
              || (fskip_string (ifp), FALSE)
150
              || (fread (&line_num, sizeof (line_num), 1, ifp) != 1))
151
            {
152
              perror (filename);
153
              done (1);
154
            }
155
        }
156
      else if (gmon_io_read_vma (ifp, &addr)
157
               || gmon_io_read_vma (ifp, &ncalls))
158
        {
159
          perror (filename);
160
          done (1);
161
        }
162
 
163
      /* Basic-block execution counts are meaningful only if we're
164
         profiling at the line-by-line level:  */
165
      if (line_granularity)
166
        {
167
          sym = sym_lookup (&symtab, addr);
168
 
169
          if (sym)
170
            {
171
              int i;
172
 
173
              DBG (BBDEBUG,
174
                   printf ("[bb_read_rec] 0x%lx->0x%lx (%s:%d) cnt=%lu\n",
175
                           (unsigned long) addr, (unsigned long) sym->addr,
176
                           sym->name, sym->line_num, (unsigned long) ncalls));
177
 
178
              for (i = 0; i < NBBS; i++)
179
                {
180
                  if (! sym->bb_addr[i] || sym->bb_addr[i] == addr)
181
                    {
182
                      sym->bb_addr[i] = addr;
183
                      sym->bb_calls[i] += ncalls;
184
                      break;
185
                    }
186
                }
187
            }
188
        }
189
      else
190
        {
191
          static bfd_boolean user_warned = FALSE;
192
 
193
          if (!user_warned)
194
            {
195
              user_warned = TRUE;
196
              fprintf (stderr,
197
  _("%s: warning: ignoring basic-block exec counts (use -l or --line)\n"),
198
                       whoami);
199
            }
200
        }
201
    }
202
  return;
203
}
204
 
205
/* Write all basic-blocks with non-zero counts to file OFP.  FILENAME
206
   is the name of OFP and is provided for producing error-messages
207
   only.  */
208
void
209
bb_write_blocks (FILE *ofp, const char *filename)
210
{
211
  unsigned int nblocks = 0;
212
  Sym *sym;
213
  int i;
214
 
215
  /* Count how many non-zero blocks with have:  */
216
  for (sym = symtab.base; sym < symtab.limit; ++sym)
217
    {
218
      for (i = 0; i < NBBS && sym->bb_addr[i]; i++)
219
        ;
220
      nblocks += i;
221
    }
222
 
223
  /* Write header:  */
224
  if (gmon_io_write_8 (ofp, GMON_TAG_BB_COUNT)
225
      || gmon_io_write_32 (ofp, nblocks))
226
    {
227
      perror (filename);
228
      done (1);
229
    }
230
 
231
  /* Write counts:  */
232
  for (sym = symtab.base; sym < symtab.limit; ++sym)
233
    {
234
      for (i = 0; i < NBBS && sym->bb_addr[i]; i++)
235
        {
236
          if (gmon_io_write_vma (ofp, sym->bb_addr[i])
237
              || gmon_io_write_vma (ofp, (bfd_vma) sym->bb_calls[i]))
238
            {
239
              perror (filename);
240
              done (1);
241
            }
242
        }
243
    }
244
}
245
 
246
/* Output basic-block statistics in a format that is easily parseable.
247
   Current the format is:
248
 
249
        <filename>:<line-number>: (<function-name>:<bb-addr): <ncalls>  */
250
 
251
void
252
print_exec_counts ()
253
{
254
  Sym **sorted_bbs, *sym;
255
  unsigned int i, j, len;
256
 
257
  if (first_output)
258
    first_output = FALSE;
259
  else
260
    printf ("\f\n");
261
 
262
  /* Sort basic-blocks according to function name and line number:  */
263
  sorted_bbs = (Sym **) xmalloc (symtab.len * sizeof (sorted_bbs[0]));
264
  len = 0;
265
 
266
  for (sym = symtab.base; sym < symtab.limit; ++sym)
267
    {
268
      /* Accept symbol if it's in the INCL_EXEC table
269
         or there is no INCL_EXEC table
270
         and it does not appear in the EXCL_EXEC table.  */
271
      if (sym_lookup (&syms[INCL_EXEC], sym->addr)
272
          || (syms[INCL_EXEC].len == 0
273
              && !sym_lookup (&syms[EXCL_EXEC], sym->addr)))
274
        {
275
          sorted_bbs[len++] = sym;
276
        }
277
    }
278
 
279
  qsort (sorted_bbs, len, sizeof (sorted_bbs[0]), cmp_bb);
280
 
281
  /* Output basic-blocks:  */
282
 
283
  for (i = 0; i < len; ++i)
284
    {
285
      sym = sorted_bbs [i];
286
 
287
      if (sym->ncalls > 0 || ! ignore_zeros)
288
        {
289
          /* FIXME: This only works if bfd_vma is unsigned long.  */
290
          printf (_("%s:%d: (%s:0x%lx) %lu executions\n"),
291
                  sym->file ? sym->file->name : _("<unknown>"), sym->line_num,
292
                  sym->name, (unsigned long) sym->addr, sym->ncalls);
293
        }
294
 
295
      for (j = 0; j < NBBS && sym->bb_addr[j]; j ++)
296
        {
297
          if (sym->bb_calls[j] > 0 || ! ignore_zeros)
298
            {
299
              /* FIXME: This only works if bfd_vma is unsigned long.  */
300
              printf (_("%s:%d: (%s:0x%lx) %lu executions\n"),
301
                      sym->file ? sym->file->name : _("<unknown>"), sym->line_num,
302
                      sym->name, (unsigned long) sym->bb_addr[j],
303
                      sym->bb_calls[j]);
304
            }
305
        }
306
    }
307
  free (sorted_bbs);
308
}
309
 
310
/* Helper for bb_annotated_source: format annotation containing
311
   number of line executions.  Depends on being called on each
312
   line of a file in sequential order.
313
 
314
   Global variable bb_annotate_all_lines enables execution count
315
   compression (counts are supressed if identical to the last one)
316
   and prints counts on all executed lines.  Otherwise, print
317
   all basic-block execution counts exactly once on the line
318
   that starts the basic-block.  */
319
 
320
static void
321
annotate_with_count (char *buf, unsigned int width, int line_num, PTR arg)
322
{
323
  Source_File *sf = (Source_File *) arg;
324
  Sym *b;
325
  unsigned int i;
326
  static unsigned long last_count;
327
  unsigned long last_print = (unsigned long) -1;
328
 
329
  b = NULL;
330
 
331
  if (line_num <= sf->num_lines)
332
    b = (Sym *) sf->line[line_num - 1];
333
 
334
  if (!b)
335
    {
336
      for (i = 0; i < width; i++)
337
        buf[i] = ' ';
338
      buf[width] = '\0';
339
    }
340
  else
341
    {
342
      char tmpbuf[NBBS * 30];
343
      char *p;
344
      unsigned long ncalls;
345
      int ncalls_set;
346
      unsigned int len;
347
 
348
      ++num_executable_lines;
349
 
350
      p = tmpbuf;
351
      *p = '\0';
352
 
353
      ncalls = 0;
354
      ncalls_set = 0;
355
 
356
      /* If this is a function entry point, label the line no matter what.
357
         Otherwise, we're in the middle of a function, so check to see
358
         if the first basic-block address is larger than the starting
359
         address of the line.  If so, then this line begins with a
360
         a portion of the previous basic-block, so print that prior
361
         execution count (if bb_annotate_all_lines is set).  */
362
      if (b->is_func)
363
        {
364
          sprintf (p, "%lu", b->ncalls);
365
          p += strlen (p);
366
          last_count = b->ncalls;
367
          last_print = last_count;
368
          ncalls = b->ncalls;
369
          ncalls_set = 1;
370
        }
371
      else if (bb_annotate_all_lines
372
               && b->bb_addr[0] && b->bb_addr[0] > b->addr)
373
        {
374
          sprintf (p, "%lu", last_count);
375
          p += strlen (p);
376
          last_print = last_count;
377
          ncalls = last_count;
378
          ncalls_set = 1;
379
        }
380
 
381
      /* Loop through all of this line's basic-blocks.  For each one,
382
         update last_count, then compress sequential identical counts
383
         (if bb_annotate_all_lines) and print the execution count.  */
384
 
385
      for (i = 0; i < NBBS && b->bb_addr[i]; i++)
386
        {
387
          last_count = b->bb_calls[i];
388
          if (! ncalls_set)
389
            {
390
              ncalls = 0;
391
              ncalls_set = 1;
392
            }
393
          ncalls += last_count;
394
 
395
          if (bb_annotate_all_lines && last_count == last_print)
396
            continue;
397
 
398
          if (p > tmpbuf)
399
            *p++ = ',';
400
          sprintf (p, "%lu", last_count);
401
          p += strlen (p);
402
 
403
          last_print = last_count;
404
        }
405
 
406
      /* We're done.  If nothing has been printed on this line,
407
         print the last execution count (bb_annotate_all_lines),
408
         which could be from either a previous line (if there were
409
         no BBs on this line), or from this line (if all our BB
410
         counts were compressed out because they were identical).  */
411
 
412
      if (bb_annotate_all_lines && p == tmpbuf)
413
        {
414
          sprintf (p, "%lu", last_count);
415
          p += strlen (p);
416
          ncalls = last_count;
417
          ncalls_set = 1;
418
        }
419
 
420
      if (! ncalls_set)
421
        {
422
          unsigned int c;
423
 
424
          for (c = 0; c < width; c++)
425
            buf[c] = ' ';
426
          buf[width] = '\0';
427
          return;
428
        }
429
 
430
      ++num_lines_executed;
431
 
432
      if (ncalls < bb_min_calls)
433
        {
434
          strcpy (tmpbuf, "#####");
435
          p = tmpbuf + 5;
436
        }
437
 
438
      strcpy (p, " -> ");
439
      p += 4;
440
 
441
      len = p - tmpbuf;
442
      if (len >= width)
443
        {
444
          strncpy (buf, tmpbuf, width);
445
          buf[width] = '\0';
446
        }
447
      else
448
        {
449
          unsigned int c;
450
 
451
          strcpy (buf + width - len, tmpbuf);
452
          for (c = 0; c < width - len; ++c)
453
            buf[c] = ' ';
454
        }
455
    }
456
}
457
 
458
/* Annotate the files named in SOURCE_FILES with basic-block statistics
459
   (execution counts).  After each source files, a few statistics
460
   regarding that source file are printed.  */
461
 
462
void
463
print_annotated_source ()
464
{
465
  Sym *sym, *line_stats, *new_line;
466
  Source_File *sf;
467
  int i, table_len;
468
  FILE *ofp;
469
 
470
  /* Find maximum line number for each source file that user is
471
     interested in:  */
472
  for (sym = symtab.base; sym < symtab.limit; ++sym)
473
    {
474
      /* Accept symbol if it's file is known, its line number is
475
         bigger than anything we have seen for that file so far and
476
         if it's in the INCL_ANNO table or there is no INCL_ANNO
477
         table and it does not appear in the EXCL_ANNO table.  */
478
      if (sym->file && sym->line_num > sym->file->num_lines
479
          && (sym_lookup (&syms[INCL_ANNO], sym->addr)
480
              || (syms[INCL_ANNO].len == 0
481
                  && !sym_lookup (&syms[EXCL_ANNO], sym->addr))))
482
        {
483
          sym->file->num_lines = sym->line_num;
484
        }
485
    }
486
 
487
  /* Allocate line descriptors:  */
488
  for (sf = first_src_file; sf; sf = sf->next)
489
    {
490
      if (sf->num_lines > 0)
491
        {
492
          sf->line = (void **) xmalloc (sf->num_lines * sizeof (sf->line[0]));
493
          memset (sf->line, 0, sf->num_lines * sizeof (sf->line[0]));
494
        }
495
    }
496
 
497
  /* Count executions per line:  */
498
  for (sym = symtab.base; sym < symtab.limit; ++sym)
499
    {
500
      if (sym->file && sym->file->num_lines
501
          && (sym_lookup (&syms[INCL_ANNO], sym->addr)
502
              || (syms[INCL_ANNO].len == 0
503
                  && !sym_lookup (&syms[EXCL_ANNO], sym->addr))))
504
        {
505
          sym->file->ncalls += sym->ncalls;
506
          line_stats = (Sym *) sym->file->line[sym->line_num - 1];
507
 
508
          if (!line_stats)
509
            {
510
              /* Common case has at most one basic-block per source line:  */
511
              sym->file->line[sym->line_num - 1] = sym;
512
            }
513
          else if (!line_stats->addr)
514
            {
515
              /* sym is the 3rd .. nth basic block for this line:  */
516
              line_stats->ncalls += sym->ncalls;
517
            }
518
          else
519
            {
520
              /* sym is the second basic block for this line.  */
521
              new_line = (Sym *) xmalloc (sizeof (*new_line));
522
              *new_line = *line_stats;
523
              new_line->addr = 0;
524
              new_line->ncalls += sym->ncalls;
525
              sym->file->line[sym->line_num - 1] = new_line;
526
            }
527
        }
528
    }
529
 
530
  /* Plod over source files, annotating them:  */
531
  for (sf = first_src_file; sf; sf = sf->next)
532
    {
533
      if (!sf->num_lines || (ignore_zeros && sf->ncalls == 0))
534
        continue;
535
 
536
      num_executable_lines = num_lines_executed = 0;
537
 
538
      ofp = annotate_source (sf, 16, annotate_with_count, sf);
539
      if (!ofp)
540
        continue;
541
 
542
      if (bb_table_length > 0)
543
        {
544
          fprintf (ofp, _("\n\nTop %d Lines:\n\n     Line      Count\n\n"),
545
                   bb_table_length);
546
 
547
          /* Abuse line arrays---it's not needed anymore:  */
548
          qsort (sf->line, sf->num_lines, sizeof (sf->line[0]), cmp_ncalls);
549
          table_len = bb_table_length;
550
 
551
          if (table_len > sf->num_lines)
552
            table_len = sf->num_lines;
553
 
554
          for (i = 0; i < table_len; ++i)
555
            {
556
              sym = (Sym *) sf->line[i];
557
 
558
              if (!sym || sym->ncalls == 0)
559
                  break;
560
 
561
              fprintf (ofp, "%9d %10lu\n", sym->line_num, sym->ncalls);
562
            }
563
        }
564
 
565
      free (sf->line);
566
      sf->line = 0;
567
 
568
      fprintf (ofp, _("\nExecution Summary:\n\n"));
569
      fprintf (ofp, _("%9ld   Executable lines in this file\n"),
570
               num_executable_lines);
571
      fprintf (ofp, _("%9ld   Lines executed\n"), num_lines_executed);
572
      fprintf (ofp, _("%9.2f   Percent of the file executed\n"),
573
               num_executable_lines
574
               ? 100.0 * num_lines_executed / (double) num_executable_lines
575
               : 100.0);
576
      fprintf (ofp, _("\n%9lu   Total number of line executions\n"),
577
               sf->ncalls);
578
      fprintf (ofp, _("%9.2f   Average executions per line\n"),
579
               num_executable_lines
580
               ? (double) sf->ncalls / (double) num_executable_lines
581
               : 0.0);
582
 
583
      if (ofp != stdout)
584
        fclose (ofp);
585
    }
586
}

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