aboutsummaryrefslogtreecommitdiff
path: root/gprof/sym_ids.c
blob: 9a93022a495cc69618865315c77efff92acd281d (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
/* sym_ids.c

   Copyright (C) 1999-2016 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 "safe-ctype.h"
#include "search_list.h"
#include "source.h"
#include "symtab.h"
#include "cg_arcs.h"
#include "sym_ids.h"
#include "corefile.h"

struct match
  {
    int prev_index;	/* Index of prev match.  */
    Sym *prev_match;	/* Previous match.  */
    Sym *first_match;	/* Chain of all matches.  */
    Sym sym;
  };

struct sym_id
  {
    struct sym_id *next;
    char *spec;			/* Parsing modifies this.  */
    Table_Id which_table;
    bfd_boolean has_right;

    struct match left, right;
  };

static struct sym_id  *id_list;

static void parse_spec
  (char *, Sym *);
static void parse_id
  (struct sym_id *);
static bfd_boolean match
  (Sym *, Sym *);
static void extend_match
  (struct match *, Sym *, Sym_Table *, bfd_boolean);


Sym_Table syms[NUM_TABLES];

#ifdef DEBUG
static const char *table_name[] =
{
  "INCL_GRAPH", "EXCL_GRAPH",
  "INCL_ARCS", "EXCL_ARCS",
  "INCL_FLAT", "EXCL_FLAT",
  "INCL_TIME", "EXCL_TIME",
  "INCL_ANNO", "EXCL_ANNO",
  "INCL_EXEC", "EXCL_EXEC"
};
#endif /* DEBUG */

/* This is the table in which we keep all the syms that match
   the right half of an arc id.  It is NOT sorted according
   to the addresses, because it is accessed only through
   the left half's CHILDREN pointers (so it's crucial not
   to reorder this table once pointers into it exist).  */
static Sym_Table right_ids;

static Source_File non_existent_file =
{
  0, "<non-existent-file>", 0, 0, 0, NULL
};


void
sym_id_add (const char *spec, Table_Id which_table)
{
  struct sym_id *id;
  int len = strlen (spec);

  id = (struct sym_id *) xmalloc (sizeof (*id) + len + 1);
  memset (id, 0, sizeof (*id));

  id->spec = (char *) id + sizeof (*id);
  strcpy (id->spec, spec);
  id->which_table = which_table;

  id->next = id_list;
  id_list = id;
}


/* A spec has the syntax FILENAME:(FUNCNAME|LINENUM).  As a convenience
   to the user, a spec without a colon is interpreted as:

	(i)   a FILENAME if it contains a dot
	(ii)  a FUNCNAME if it starts with a non-digit character
	(iii) a LINENUM if it starts with a digit

   A FUNCNAME containing a dot can be specified by :FUNCNAME, a
   FILENAME not containing a dot can be specified by FILENAME.  */

static void
parse_spec (char *spec, Sym *sym)
{
  char *colon;

  sym_init (sym);
  colon = strrchr (spec, ':');

  if (colon)
    {
      *colon = '\0';

      if (colon > spec)
	{
	  sym->file = source_file_lookup_name (spec);

	  if (!sym->file)
	    sym->file = &non_existent_file;
	}

      spec = colon + 1;

      if (strlen (spec))
	{
	  if (ISDIGIT (spec[0]))
	    sym->line_num = atoi (spec);
	  else
	    sym->name = spec;
	}
    }
  else if (strlen (spec))
    {
      /* No colon: spec is a filename if it contains a dot.  */
      if (strchr (spec, '.'))
	{
	  sym->file = source_file_lookup_name (spec);

	  if (!sym->file)
	    sym->file = &non_existent_file;
	}
      else if (ISDIGIT (*spec))
	{
	  sym->line_num = atoi (spec);
	}
      else if (strlen (spec))
	{
	  sym->name = spec;
	}
    }
}


/* A symbol id has the syntax SPEC[/SPEC], where SPEC is is defined
   by parse_spec().  */

static void
parse_id (struct sym_id *id)
{
  char *slash;

  DBG (IDDEBUG, printf ("[parse_id] %s -> ", id->spec));

  slash = strchr (id->spec, '/');
  if (slash)
    {
      parse_spec (slash + 1, &id->right.sym);
      *slash = '\0';
      id->has_right = TRUE;
    }
  parse_spec (id->spec, &id->left.sym);

#ifdef DEBUG
  if (debug_level & IDDEBUG)
    {
      printf ("%s:", id->left.sym.file ? id->left.sym.file->name : "*");

      if (id->left.sym.name)
	printf ("%s", id->left.sym.name);
      else if (id->left.sym.line_num)
	printf ("%d", id->left.sym.line_num);
      else
	printf ("*");

      if (id->has_right)
	{
	  printf ("/%s:",
		  id->right.sym.file ? id->right.sym.file->name : "*");

	  if (id->right.sym.name)
	    printf ("%s", id->right.sym.name);
	  else if (id->right.sym.line_num)
	    printf ("%d", id->right.sym.line_num);
	  else
	    printf ("*");
	}

      printf ("\n");
    }
#endif
}


/* Return TRUE iff PATTERN matches SYM.  */

static bfd_boolean
match (Sym *pattern, Sym *sym)
{
  if (pattern->file && pattern->file != sym->file)
    return FALSE;
  if (pattern->line_num && pattern->line_num != sym->line_num)
    return FALSE;
  if (pattern->name)
    {
      const char *sym_name = sym->name;
      if (*sym_name && bfd_get_symbol_leading_char (core_bfd) == *sym_name)
	sym_name++;
      if (strcmp (pattern->name, sym_name) != 0)
	return FALSE;
    }
  return TRUE;
}


static void
extend_match (struct match *m, Sym *sym, Sym_Table *tab, bfd_boolean second_pass)
{
  if (m->prev_match != sym - 1)
    {
      /* Discontinuity: add new match to table.  */
      if (second_pass)
	{
	  tab->base[tab->len] = *sym;
	  m->prev_index = tab->len;

	  /* Link match into match's chain.  */
	  tab->base[tab->len].next = m->first_match;
	  m->first_match = &tab->base[tab->len];
	}

      ++tab->len;
    }

  /* Extend match to include this symbol.  */
  if (second_pass)
    tab->base[m->prev_index].end_addr = sym->end_addr;

  m->prev_match = sym;
}


/* Go through sym_id list produced by option processing and fill
   in the various symbol tables indicating what symbols should
   be displayed or suppressed for the various kinds of outputs.

   This can potentially produce huge tables and in particulars
   tons of arcs, but this happens only if the user makes silly
   requests---you get what you ask for!  */

void
sym_id_parse ()
{
  Sym *sym, *left, *right;
  struct sym_id *id;
  Sym_Table *tab;

  /* Convert symbol ids into Syms, so we can deal with them more easily.  */
  for (id = id_list; id; id = id->next)
    parse_id (id);

  /* First determine size of each table.  */
  for (sym = symtab.base; sym < symtab.limit; ++sym)
    {
      for (id = id_list; id; id = id->next)
	{
	  if (match (&id->left.sym, sym))
	    extend_match (&id->left, sym, &syms[id->which_table], FALSE);

	  if (id->has_right && match (&id->right.sym, sym))
	    extend_match (&id->right, sym, &right_ids, FALSE);
	}
    }

  /* Create tables of appropriate size and reset lengths.  */
  for (tab = syms; tab < &syms[NUM_TABLES]; ++tab)
    {
      if (tab->len)
	{
	  tab->base = (Sym *) xmalloc (tab->len * sizeof (Sym));
	  tab->limit = tab->base + tab->len;
	  tab->len = 0;
	}
    }

  if (right_ids.len)
    {
      right_ids.base = (Sym *) xmalloc (right_ids.len * sizeof (Sym));
      right_ids.limit = right_ids.base + right_ids.len;
      right_ids.len = 0;
    }

  /* Make a second pass through symtab, creating syms as necessary.  */
  for (sym = symtab.base; sym < symtab.limit; ++sym)
    {
      for (id = id_list; id; id = id->next)
	{
	  if (match (&id->left.sym, sym))
	    extend_match (&id->left, sym, &syms[id->which_table], TRUE);

	  if (id->has_right && match (&id->right.sym, sym))
	    extend_match (&id->right, sym, &right_ids, TRUE);
	}
    }

  /* Go through ids creating arcs as needed.  */
  for (id = id_list; id; id = id->next)
    {
      if (id->has_right)
	{
	  for (left = id->left.first_match; left; left = left->next)
	    {
	      for (right = id->right.first_match; right; right = right->next)
		{
		  DBG (IDDEBUG,
		       printf (
				"[sym_id_parse]: arc %s:%s(%lx-%lx) -> %s:%s(%lx-%lx) to %s\n",
				left->file ? left->file->name : "*",
				left->name ? left->name : "*",
				(unsigned long) left->addr,
				(unsigned long) left->end_addr,
				right->file ? right->file->name : "*",
				right->name ? right->name : "*",
				(unsigned long) right->addr,
				(unsigned long) right->end_addr,
				table_name[id->which_table]));

		  arc_add (left, right, (unsigned long) 0);
		}
	    }
	}
    }

  /* Finally, we can sort the tables and we're done.  */
  for (tab = &syms[0]; tab < &syms[NUM_TABLES]; ++tab)
    {
      DBG (IDDEBUG, printf ("[sym_id_parse] syms[%s]:\n",
			    table_name[tab - &syms[0]]));
      symtab_finalize (tab);
    }
}


/* Symbol tables storing the FROM symbols of arcs do not necessarily
   have distinct address ranges.  For example, somebody might request
   -k /_mcount to suppress any arcs into _mcount, while at the same
   time requesting -k a/b.  Fortunately, those symbol tables don't get
   very big (the user has to type them!), so a linear search is probably
   tolerable.  */
bfd_boolean
sym_id_arc_is_present (Sym_Table *sym_tab, Sym *from, Sym *to)
{
  Sym *sym;

  for (sym = sym_tab->base; sym < sym_tab->limit; ++sym)
    {
      if (from->addr >= sym->addr && from->addr <= sym->end_addr
	  && arc_lookup (sym, to))
	return TRUE;
    }

  return FALSE;
}