aboutsummaryrefslogtreecommitdiff
path: root/gprof/basic_blocks.c
blob: 8453829ee74dd065745c00c5c8bcbb4dd1dd4cd6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
/* basic_blocks.c  -  Basic-block level related code: reading/writing
   of basic-block info to/from gmon.out; computing and formatting of
   basic-block related statistics.

   Copyright (C) 1999-2024 Free Software Foundation, Inc.

   This file is part of GNU Binutils.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
   02110-1301, USA.  */

#include "gprof.h"
#include "libiberty.h"
#include "filenames.h"
#include "basic_blocks.h"
#include "corefile.h"
#include "gmon_io.h"
#include "gmon_out.h"
#include "search_list.h"
#include "source.h"
#include "symtab.h"
#include "sym_ids.h"

static int cmp_bb (const void *, const void *);
static int cmp_ncalls (const void *, const void *);
static void fskip_string (FILE *);
static void annotate_with_count (char *, unsigned int, int, void *);

/* Default option values:  */
bool bb_annotate_all_lines = false;
unsigned long bb_min_calls = 1;
int bb_table_length = 10;

/* Variables used to compute annotated source listing stats:  */
static long num_executable_lines;
static long num_lines_executed;


/* Helper for sorting.  Compares two symbols and returns result
   such that sorting will be increasing according to filename, line
   number, and address (in that order).  */

static int
cmp_bb (const void *lp, const void *rp)
{
  int r;
  const Sym *left = *(const Sym **) lp;
  const Sym *right = *(const Sym **) rp;

  if (left->file && right->file)
    {
      r = filename_cmp (left->file->name, right->file->name);

      if (r)
	return r;

      if (left->line_num != right->line_num)
	return left->line_num - right->line_num;
    }

  if (left->addr < right->addr)
    return -1;
  else if (left->addr > right->addr)
    return 1;
  else
    return 0;
}


/* Helper for sorting.  Order basic blocks in decreasing number of
   calls, ties are broken in increasing order of line numbers.  */
static int
cmp_ncalls (const void *lp, const void *rp)
{
  const Sym *left = *(const Sym **) lp;
  const Sym *right = *(const Sym **) rp;

  if (!left)
    return 1;
  else if (!right)
    return -1;

  if (left->ncalls < right->ncalls)
    return 1;
  else if (left->ncalls > right->ncalls)
    return -1;

  return left->line_num - right->line_num;
}

/* Skip over variable length string.  */
static void
fskip_string (FILE *fp)
{
  int ch;

  while ((ch = fgetc (fp)) != EOF)
    {
      if (ch == '\0')
	break;
    }
}

/* Read a basic-block record from file IFP.  FILENAME is the name
   of file IFP and is provided for formatting error-messages only.  */

void
bb_read_rec (FILE *ifp, const char *filename)
{
  unsigned int nblocks, b;
  bfd_vma addr, ncalls;
  Sym *sym;

  if (gmon_io_read_32 (ifp, &nblocks))
    {
      fprintf (stderr, _("%s: %s: unexpected end of file\n"),
	       whoami, filename);
      done (1);
    }

  nblocks = bfd_get_32 (core_bfd, (bfd_byte *) & nblocks);
  if (gmon_file_version == 0)
    fskip_string (ifp);

  for (b = 0; b < nblocks; ++b)
    {
      if (gmon_file_version == 0)
	{
	  int line_num;

	  /* Version 0 had lots of extra stuff that we don't
	     care about anymore.  */
	  if ((fread (&ncalls, sizeof (ncalls), 1, ifp) != 1)
	      || (fread (&addr, sizeof (addr), 1, ifp) != 1)
	      || (fskip_string (ifp), false)
	      || (fskip_string (ifp), false)
	      || (fread (&line_num, sizeof (line_num), 1, ifp) != 1))
	    {
	      perror (filename);
	      done (1);
	    }
	}
      else if (gmon_io_read_vma (ifp, &addr)
	       || gmon_io_read_vma (ifp, &ncalls))
	{
	  perror (filename);
	  done (1);
	}

      /* Basic-block execution counts are meaningful only if we're
	 profiling at the line-by-line level:  */
      if (line_granularity)
	{
	  sym = sym_lookup (&symtab, addr);

	  if (sym)
	    {
	      int i;

	      DBG (BBDEBUG,
		   printf ("[bb_read_rec] 0x%lx->0x%lx (%s:%d) cnt=%lu\n",
			   (unsigned long) addr, (unsigned long) sym->addr,
			   sym->name, sym->line_num, (unsigned long) ncalls));

	      for (i = 0; i < NBBS; i++)
		{
		  if (! sym->bb_addr[i] || sym->bb_addr[i] == addr)
		    {
		      sym->bb_addr[i] = addr;
		      sym->bb_calls[i] += ncalls;
		      break;
		    }
		}
	    }
	}
      else
	{
	  static bool user_warned = false;

	  if (!user_warned)
	    {
	      user_warned = true;
	      fprintf (stderr,
  _("%s: warning: ignoring basic-block exec counts (use -l or --line)\n"),
		       whoami);
	    }
	}
    }
  return;
}

/* Write all basic-blocks with non-zero counts to file OFP.  FILENAME
   is the name of OFP and is provided for producing error-messages
   only.  */
void
bb_write_blocks (FILE *ofp, const char *filename)
{
  unsigned int nblocks = 0;
  Sym *sym;
  int i;

  /* Count how many non-zero blocks with have:  */
  for (sym = symtab.base; sym < symtab.limit; ++sym)
    {
      for (i = 0; i < NBBS && sym->bb_addr[i]; i++)
	;
      nblocks += i;
    }

  /* Write header:  */
  if (gmon_io_write_8 (ofp, GMON_TAG_BB_COUNT)
      || gmon_io_write_32 (ofp, nblocks))
    {
      perror (filename);
      done (1);
    }

  /* Write counts:  */
  for (sym = symtab.base; sym < symtab.limit; ++sym)
    {
      for (i = 0; i < NBBS && sym->bb_addr[i]; i++)
	{
	  if (gmon_io_write_vma (ofp, sym->bb_addr[i])
	      || gmon_io_write_vma (ofp, (bfd_vma) sym->bb_calls[i]))
	    {
	      perror (filename);
	      done (1);
	    }
	}
    }
}

/* Output basic-block statistics in a format that is easily parseable.
   Current the format is:

	<filename>:<line-number>: (<function-name>:<bb-addr): <ncalls>  */

void
print_exec_counts (void)
{
  Sym **sorted_bbs, *sym;
  unsigned int i, j, len;

  if (first_output)
    first_output = false;
  else
    printf ("\f\n");

  /* Sort basic-blocks according to function name and line number:  */
  sorted_bbs = (Sym **) xmalloc (symtab.len * sizeof (sorted_bbs[0]));
  len = 0;

  for (sym = symtab.base; sym < symtab.limit; ++sym)
    {
      /* Accept symbol if it's in the INCL_EXEC table
	 or there is no INCL_EXEC table
	 and it does not appear in the EXCL_EXEC table.  */
      if (sym_lookup (&syms[INCL_EXEC], sym->addr)
	  || (syms[INCL_EXEC].len == 0
	      && !sym_lookup (&syms[EXCL_EXEC], sym->addr)))
	{
	  sorted_bbs[len++] = sym;
	}
    }

  qsort (sorted_bbs, len, sizeof (sorted_bbs[0]), cmp_bb);

  /* Output basic-blocks:  */

  for (i = 0; i < len; ++i)
    {
      sym = sorted_bbs [i];

      if (sym->ncalls > 0 || ! ignore_zeros)
	{
	  /* FIXME: This only works if bfd_vma is unsigned long.  */
	  printf (_("%s:%d: (%s:0x%lx) %lu executions\n"),
		  sym->file ? sym->file->name : _("<unknown>"), sym->line_num,
		  sym->name, (unsigned long) sym->addr, sym->ncalls);
	}

      for (j = 0; j < NBBS && sym->bb_addr[j]; j ++)
	{
	  if (sym->bb_calls[j] > 0 || ! ignore_zeros)
	    {
	      /* FIXME: This only works if bfd_vma is unsigned long.  */
	      printf (_("%s:%d: (%s:0x%lx) %lu executions\n"),
		      sym->file ? sym->file->name : _("<unknown>"), sym->line_num,
		      sym->name, (unsigned long) sym->bb_addr[j],
		      sym->bb_calls[j]);
	    }
	}
    }
  free (sorted_bbs);
}

/* Helper for bb_annotated_source: format annotation containing
   number of line executions.  Depends on being called on each
   line of a file in sequential order.

   Global variable bb_annotate_all_lines enables execution count
   compression (counts are suppressed if identical to the last one)
   and prints counts on all executed lines.  Otherwise, print
   all basic-block execution counts exactly once on the line
   that starts the basic-block.  */

static void
annotate_with_count (char *buf, unsigned int width, int line_num, void *arg)
{
  Source_File *sf = (Source_File *) arg;
  Sym *b;
  unsigned int i;
  static unsigned long last_count;
  unsigned long last_print = (unsigned long) -1;

  b = NULL;

  if (line_num <= sf->num_lines)
    b = (Sym *) sf->line[line_num - 1];

  if (!b)
    {
      for (i = 0; i < width; i++)
	buf[i] = ' ';
      buf[width] = '\0';
    }
  else
    {
      char tmpbuf[NBBS * 30];
      char *p;
      unsigned long ncalls;
      int ncalls_set;
      unsigned int len;

      ++num_executable_lines;

      p = tmpbuf;
      *p = '\0';

      ncalls = 0;
      ncalls_set = 0;

      /* If this is a function entry point, label the line no matter what.
	 Otherwise, we're in the middle of a function, so check to see
	 if the first basic-block address is larger than the starting
	 address of the line.  If so, then this line begins with a
	 a portion of the previous basic-block, so print that prior
	 execution count (if bb_annotate_all_lines is set).  */
      if (b->is_func)
	{
	  p += sprintf (p, "%lu", b->ncalls);
	  last_count = b->ncalls;
	  last_print = last_count;
	  ncalls = b->ncalls;
	  ncalls_set = 1;
	}
      else if (bb_annotate_all_lines
	       && b->bb_addr[0] && b->bb_addr[0] > b->addr)
	{
	  p += sprintf (p, "%lu", last_count);
	  last_print = last_count;
	  ncalls = last_count;
	  ncalls_set = 1;
	}

      /* Loop through all of this line's basic-blocks.  For each one,
	 update last_count, then compress sequential identical counts
	 (if bb_annotate_all_lines) and print the execution count.  */

      for (i = 0; i < NBBS && b->bb_addr[i]; i++)
	{
	  last_count = b->bb_calls[i];
	  if (! ncalls_set)
	    {
	      ncalls = 0;
	      ncalls_set = 1;
	    }
	  ncalls += last_count;

	  if (bb_annotate_all_lines && last_count == last_print)
	    continue;

	  if (p > tmpbuf)
	    *p++ = ',';
	  p += sprintf (p, "%lu", last_count);

	  last_print = last_count;
	}

      /* We're done.  If nothing has been printed on this line,
	 print the last execution count (bb_annotate_all_lines),
	 which could be from either a previous line (if there were
	 no BBs on this line), or from this line (if all our BB
	 counts were compressed out because they were identical).  */

      if (bb_annotate_all_lines && p == tmpbuf)
	{
	  p += sprintf (p, "%lu", last_count);
	  ncalls = last_count;
	  ncalls_set = 1;
	}

      if (! ncalls_set)
	{
	  unsigned int c;

	  for (c = 0; c < width; c++)
	    buf[c] = ' ';
	  buf[width] = '\0';
	  return;
	}

      ++num_lines_executed;

      if (ncalls < bb_min_calls)
	{
	  strcpy (tmpbuf, "#####");
	  p = tmpbuf + 5;
	}

      strcpy (p, " -> ");
      p += 4;

      len = p - tmpbuf;
      if (len >= width)
	{
	  strncpy (buf, tmpbuf, width);
	  buf[width] = '\0';
	}
      else
	{
	  unsigned int c;

	  strcpy (buf + width - len, tmpbuf);
	  for (c = 0; c < width - len; ++c)
	    buf[c] = ' ';
	}
    }
}

/* Annotate the files named in SOURCE_FILES with basic-block statistics
   (execution counts).  After each source files, a few statistics
   regarding that source file are printed.  */

void
print_annotated_source (void)
{
  Sym *sym, *line_stats, *new_line;
  Source_File *sf;
  int i, table_len;
  FILE *ofp;

  /* Find maximum line number for each source file that user is
     interested in:  */
  for (sym = symtab.base; sym < symtab.limit; ++sym)
    {
      /* Accept symbol if it's file is known, its line number is
	 bigger than anything we have seen for that file so far and
	 if it's in the INCL_ANNO table or there is no INCL_ANNO
	 table and it does not appear in the EXCL_ANNO table.  */
      if (sym->file && sym->line_num > sym->file->num_lines
	  && (sym_lookup (&syms[INCL_ANNO], sym->addr)
	      || (syms[INCL_ANNO].len == 0
		  && !sym_lookup (&syms[EXCL_ANNO], sym->addr))))
	{
	  sym->file->num_lines = sym->line_num;
	}
    }

  /* Allocate line descriptors:  */
  for (sf = first_src_file; sf; sf = sf->next)
    {
      if (sf->num_lines > 0)
	{
	  sf->line = (void **) xmalloc (sf->num_lines * sizeof (sf->line[0]));
	  memset (sf->line, 0, sf->num_lines * sizeof (sf->line[0]));
	}
    }

  /* Count executions per line:  */
  for (sym = symtab.base; sym < symtab.limit; ++sym)
    {
      if (sym->file && sym->file->num_lines
	  && (sym_lookup (&syms[INCL_ANNO], sym->addr)
	      || (syms[INCL_ANNO].len == 0
		  && !sym_lookup (&syms[EXCL_ANNO], sym->addr))))
	{
	  sym->file->ncalls += sym->ncalls;
	  line_stats = (Sym *) sym->file->line[sym->line_num - 1];

	  if (!line_stats)
	    {
	      /* Common case has at most one basic-block per source line:  */
	      sym->file->line[sym->line_num - 1] = sym;
	    }
	  else if (!line_stats->addr)
	    {
	      /* sym is the 3rd .. nth basic block for this line:  */
	      line_stats->ncalls += sym->ncalls;
	    }
	  else
	    {
	      /* sym is the second basic block for this line.  */
	      new_line = (Sym *) xmalloc (sizeof (*new_line));
	      *new_line = *line_stats;
	      new_line->addr = 0;
	      new_line->ncalls += sym->ncalls;
	      sym->file->line[sym->line_num - 1] = new_line;
	    }
	}
    }

  /* Plod over source files, annotating them:  */
  for (sf = first_src_file; sf; sf = sf->next)
    {
      if (!sf->num_lines || (ignore_zeros && sf->ncalls == 0))
	continue;

      num_executable_lines = num_lines_executed = 0;

      ofp = annotate_source (sf, 16, annotate_with_count, sf);
      if (!ofp)
	continue;

      if (bb_table_length > 0)
	{
	  fprintf (ofp, _("\n\nTop %d Lines:\n\n     Line      Count\n\n"),
		   bb_table_length);

	  /* Abuse line arrays---it's not needed anymore:  */
	  qsort (sf->line, sf->num_lines, sizeof (sf->line[0]), cmp_ncalls);
	  table_len = bb_table_length;

	  if (table_len > sf->num_lines)
	    table_len = sf->num_lines;

	  for (i = 0; i < table_len; ++i)
	    {
	      sym = (Sym *) sf->line[i];

	      if (!sym || sym->ncalls == 0)
		  break;

	      fprintf (ofp, "%9d %10lu\n", sym->line_num, sym->ncalls);
	    }
	}

      free (sf->line);
      sf->line = 0;

      fprintf (ofp, _("\nExecution Summary:\n\n"));
      fprintf (ofp, _("%9ld   Executable lines in this file\n"),
	       num_executable_lines);
      fprintf (ofp, _("%9ld   Lines executed\n"), num_lines_executed);
      fprintf (ofp, _("%9.2f   Percent of the file executed\n"),
	       num_executable_lines
	       ? 100.0 * num_lines_executed / (double) num_executable_lines
	       : 100.0);
      fprintf (ofp, _("\n%9lu   Total number of line executions\n"),
	       sf->ncalls);
      fprintf (ofp, _("%9.2f   Average executions per line\n"),
	       num_executable_lines
	       ? (double) sf->ncalls / (double) num_executable_lines
	       : 0.0);

      if (ofp != stdout)
	fclose (ofp);
    }
}