aboutsummaryrefslogtreecommitdiff
path: root/gdb/location.c
blob: 87963207ba16eef22ee92fea4f6a58b6a9ccf63a (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
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
/* Data structures and API for event locations in GDB.
   Copyright (C) 2013-2017 Free Software Foundation, Inc.

   This file is part of GDB.

   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, see <http://www.gnu.org/licenses/>.  */

#include "defs.h"
#include "gdb_assert.h"
#include "location.h"
#include "symtab.h"
#include "language.h"
#include "linespec.h"
#include "cli/cli-utils.h"
#include "probe.h"

#include <ctype.h>
#include <string.h>

/* An event location used to set a stop event in the inferior.
   This structure is an amalgam of the various ways
   to specify where a stop event should be set.  */

struct event_location
{
  /* The type of this breakpoint specification.  */
  enum event_location_type type;
#define EL_TYPE(P) (P)->type

  union
  {
    /* A generic "this is a string specification" for a location.
       This representation is used by both "normal" linespecs and
       probes.  */
    char *addr_string;
#define EL_LINESPEC(P) ((P)->u.addr_string)
#define EL_PROBE(P) ((P)->u.addr_string)

    /* An address in the inferior.  */
    CORE_ADDR address;
#define EL_ADDRESS(P) (P)->u.address

    /* An explicit location.  */
    struct explicit_location explicit_loc;
#define EL_EXPLICIT(P) (&((P)->u.explicit_loc))
  } u;

  /* Cached string representation of this location.  This is used, e.g., to
     save stop event locations to file.  Malloc'd.  */
  char *as_string;
#define EL_STRING(P) ((P)->as_string)
};

/* See description in location.h.  */

enum event_location_type
event_location_type (const struct event_location *location)
{
  return EL_TYPE (location);
}

/* See description in location.h.  */

void
initialize_explicit_location (struct explicit_location *explicit_loc)
{
  memset (explicit_loc, 0, sizeof (struct explicit_location));
  explicit_loc->line_offset.sign = LINE_OFFSET_UNKNOWN;
}

/* See description in location.h.  */

event_location_up
new_linespec_location (char **linespec)
{
  struct event_location *location;

  location = XCNEW (struct event_location);
  EL_TYPE (location) = LINESPEC_LOCATION;
  if (*linespec != NULL)
    {
      char *p;
      char *orig = *linespec;

      linespec_lex_to_end (linespec);
      p = remove_trailing_whitespace (orig, *linespec);
      if ((p - orig) > 0)
	EL_LINESPEC (location) = savestring (orig, p - orig);
    }
  return event_location_up (location);
}

/* See description in location.h.  */

const char *
get_linespec_location (const struct event_location *location)
{
  gdb_assert (EL_TYPE (location) == LINESPEC_LOCATION);
  return EL_LINESPEC (location);
}

/* See description in location.h.  */

event_location_up
new_address_location (CORE_ADDR addr, const char *addr_string,
		      int addr_string_len)
{
  struct event_location *location;

  location = XCNEW (struct event_location);
  EL_TYPE (location) = ADDRESS_LOCATION;
  EL_ADDRESS (location) = addr;
  if (addr_string != NULL)
    EL_STRING (location) = xstrndup (addr_string, addr_string_len);
  return event_location_up (location);
}

/* See description in location.h.  */

CORE_ADDR
get_address_location (const struct event_location *location)
{
  gdb_assert (EL_TYPE (location) == ADDRESS_LOCATION);
  return EL_ADDRESS (location);
}

/* See description in location.h.  */

const char *
get_address_string_location (const struct event_location *location)
{
  gdb_assert (EL_TYPE (location) == ADDRESS_LOCATION);
  return EL_STRING (location);
}

/* See description in location.h.  */

event_location_up
new_probe_location (const char *probe)
{
  struct event_location *location;

  location = XCNEW (struct event_location);
  EL_TYPE (location) = PROBE_LOCATION;
  if (probe != NULL)
    EL_PROBE (location) = xstrdup (probe);
  return event_location_up (location);
}

/* See description in location.h.  */

const char *
get_probe_location (const struct event_location *location)
{
  gdb_assert (EL_TYPE (location) == PROBE_LOCATION);
  return EL_PROBE (location);
}

/* See description in location.h.  */

event_location_up
new_explicit_location (const struct explicit_location *explicit_loc)
{
  struct event_location tmp;

  memset (&tmp, 0, sizeof (struct event_location));
  EL_TYPE (&tmp) = EXPLICIT_LOCATION;
  initialize_explicit_location (EL_EXPLICIT (&tmp));
  if (explicit_loc != NULL)
    {
      if (explicit_loc->source_filename != NULL)
	{
	  EL_EXPLICIT (&tmp)->source_filename
	    = explicit_loc->source_filename;
	}

      if (explicit_loc->function_name != NULL)
	EL_EXPLICIT (&tmp)->function_name
	  = explicit_loc->function_name;

      if (explicit_loc->label_name != NULL)
	EL_EXPLICIT (&tmp)->label_name = explicit_loc->label_name;

      if (explicit_loc->line_offset.sign != LINE_OFFSET_UNKNOWN)
	EL_EXPLICIT (&tmp)->line_offset = explicit_loc->line_offset;
    }

  return copy_event_location (&tmp);
}

/* See description in location.h.  */

struct explicit_location *
get_explicit_location (struct event_location *location)
{
  gdb_assert (EL_TYPE (location) == EXPLICIT_LOCATION);
  return EL_EXPLICIT (location);
}

/* See description in location.h.  */

const struct explicit_location *
get_explicit_location_const (const struct event_location *location)
{
  gdb_assert (EL_TYPE (location) == EXPLICIT_LOCATION);
  return EL_EXPLICIT (location);
}

/* This convenience function returns a malloc'd string which
   represents the location in EXPLICIT_LOC.

   AS_LINESPEC is non-zero if this string should be a linespec.
   Otherwise it will be output in explicit form.  */

static char *
explicit_to_string_internal (int as_linespec,
			     const struct explicit_location *explicit_loc)
{
  int need_space = 0;
  char space = as_linespec ? ':' : ' ';
  string_file buf;

  if (explicit_loc->source_filename != NULL)
    {
      if (!as_linespec)
	buf.puts ("-source ");
      buf.puts (explicit_loc->source_filename);
      need_space = 1;
    }

  if (explicit_loc->function_name != NULL)
    {
      if (need_space)
	buf.putc (space);
      if (!as_linespec)
	buf.puts ("-function ");
      buf.puts (explicit_loc->function_name);
      need_space = 1;
    }

  if (explicit_loc->label_name != NULL)
    {
      if (need_space)
	buf.putc (space);
      if (!as_linespec)
	buf.puts ("-label ");
      buf.puts (explicit_loc->label_name);
      need_space = 1;
    }

  if (explicit_loc->line_offset.sign != LINE_OFFSET_UNKNOWN)
    {
      if (need_space)
	buf.putc (space);
      if (!as_linespec)
	buf.puts ("-line ");
      buf.printf ("%s%d",
		  (explicit_loc->line_offset.sign == LINE_OFFSET_NONE ? ""
		   : (explicit_loc->line_offset.sign
		      == LINE_OFFSET_PLUS ? "+" : "-")),
		  explicit_loc->line_offset.offset);
    }

  return xstrdup (buf.c_str ());
}

/* See description in location.h.  */

char *
explicit_location_to_string (const struct explicit_location *explicit_loc)
{
  return explicit_to_string_internal (0, explicit_loc);
}

/* See description in location.h.  */

char *
explicit_location_to_linespec (const struct explicit_location *explicit_loc)
{
  return explicit_to_string_internal (1, explicit_loc);
}

/* See description in location.h.  */

event_location_up
copy_event_location (const struct event_location *src)
{
  struct event_location *dst;

  dst = XCNEW (struct event_location);
  EL_TYPE (dst) = EL_TYPE (src);
  if (EL_STRING (src) != NULL)
    EL_STRING (dst) = xstrdup (EL_STRING (src));

  switch (EL_TYPE (src))
    {
    case LINESPEC_LOCATION:
      if (EL_LINESPEC (src) != NULL)
	EL_LINESPEC (dst) = xstrdup (EL_LINESPEC (src));
      break;

    case ADDRESS_LOCATION:
      EL_ADDRESS (dst) = EL_ADDRESS (src);
      break;

    case EXPLICIT_LOCATION:
      if (EL_EXPLICIT (src)->source_filename != NULL)
	EL_EXPLICIT (dst)->source_filename
	  = xstrdup (EL_EXPLICIT (src)->source_filename);

      if (EL_EXPLICIT (src)->function_name != NULL)
	EL_EXPLICIT (dst)->function_name
	  = xstrdup (EL_EXPLICIT (src)->function_name);

      if (EL_EXPLICIT (src)->label_name != NULL)
	EL_EXPLICIT (dst)->label_name = xstrdup (EL_EXPLICIT (src)->label_name);

      EL_EXPLICIT (dst)->line_offset = EL_EXPLICIT (src)->line_offset;
      break;


    case PROBE_LOCATION:
      if (EL_PROBE (src) != NULL)
	EL_PROBE (dst) = xstrdup (EL_PROBE (src));
      break;

    default:
      gdb_assert_not_reached ("unknown event location type");
    }

  return event_location_up (dst);
}

void
event_location_deleter::operator() (event_location *location) const
{
  if (location != NULL)
    {
      xfree (EL_STRING (location));

      switch (EL_TYPE (location))
	{
	case LINESPEC_LOCATION:
	  xfree (EL_LINESPEC (location));
	  break;

	case ADDRESS_LOCATION:
	  /* Nothing to do.  */
	  break;

	case EXPLICIT_LOCATION:
	  xfree (EL_EXPLICIT (location)->source_filename);
	  xfree (EL_EXPLICIT (location)->function_name);
	  xfree (EL_EXPLICIT (location)->label_name);
	  break;

	case PROBE_LOCATION:
	  xfree (EL_PROBE (location));
	  break;

	default:
	  gdb_assert_not_reached ("unknown event location type");
	}

      xfree (location);
    }
}

/* See description in location.h.  */

const char *
event_location_to_string (struct event_location *location)
{
  if (EL_STRING (location) == NULL)
    {
      switch (EL_TYPE (location))
	{
	case LINESPEC_LOCATION:
	  if (EL_LINESPEC (location) != NULL)
	    EL_STRING (location) = xstrdup (EL_LINESPEC (location));
	  break;

	case ADDRESS_LOCATION:
	  EL_STRING (location)
	    = xstrprintf ("*%s",
			  core_addr_to_string (EL_ADDRESS (location)));
	  break;

	case EXPLICIT_LOCATION:
	  EL_STRING (location)
	    = explicit_location_to_string (EL_EXPLICIT (location));
	  break;

	case PROBE_LOCATION:
	  EL_STRING (location) = xstrdup (EL_PROBE (location));
	  break;

	default:
	  gdb_assert_not_reached ("unknown event location type");
	}
    }

  return EL_STRING (location);
}

/* A lexer for explicit locations.  This function will advance INP
   past any strings that it lexes.  Returns a malloc'd copy of the
   lexed string or NULL if no lexing was done.  */

static gdb::unique_xmalloc_ptr<char>
explicit_location_lex_one (const char **inp,
			   const struct language_defn *language)
{
  const char *start = *inp;

  if (*start == '\0')
    return NULL;

  /* If quoted, skip to the ending quote.  */
  if (strchr (get_gdb_linespec_parser_quote_characters (), *start))
    {
      char quote_char = *start;

      /* If the input is not an Ada operator, skip to the matching
	 closing quote and return the string.  */
      if (!(language->la_language == language_ada
	    && quote_char == '\"' && is_ada_operator (start)))
	{
	  const char *end = find_toplevel_char (start + 1, quote_char);

	  if (end == NULL)
	    error (_("Unmatched quote, %s."), start);
	  *inp = end + 1;
	  return gdb::unique_xmalloc_ptr<char> (savestring (start + 1,
							    *inp - start - 2));
	}
    }

  /* If the input starts with '-' or '+', the string ends with the next
     whitespace or comma.  */
  if (*start == '-' || *start == '+')
    {
      while (*inp[0] != '\0' && *inp[0] != ',' && !isspace (*inp[0]))
	++(*inp);
    }
  else
    {
      /* Handle numbers first, stopping at the next whitespace or ','.  */
      while (isdigit (*inp[0]))
	++(*inp);
      if (*inp[0] == '\0' || isspace (*inp[0]) || *inp[0] == ',')
	return gdb::unique_xmalloc_ptr<char> (savestring (start,
							  *inp - start));

      /* Otherwise stop at the next occurrence of whitespace, '\0',
	 keyword, or ','.  */
      *inp = start;
      while ((*inp)[0]
	     && (*inp)[0] != ','
	     && !(isspace ((*inp)[0])
		  || linespec_lexer_lex_keyword (&(*inp)[1])))
	{
	  /* Special case: C++ operator,.  */
	  if (language->la_language == language_cplus
	      && strncmp (*inp, "operator", 8) == 0)
	    (*inp) += 8;
	  ++(*inp);
	}
    }

  if (*inp - start > 0)
    return gdb::unique_xmalloc_ptr<char> (savestring (start, *inp - start));

  return NULL;
}

/* See description in location.h.  */

event_location_up
string_to_explicit_location (const char **argp,
			     const struct language_defn *language,
			     int dont_throw)
{
  event_location_up location;

  /* It is assumed that input beginning with '-' and a non-digit
     character is an explicit location.  "-p" is reserved, though,
     for probe locations.  */
  if (argp == NULL
      || *argp == NULL
      || *argp[0] != '-'
      || !isalpha ((*argp)[1])
      || ((*argp)[0] == '-' && (*argp)[1] == 'p'))
    return NULL;

  location = new_explicit_location (NULL);

  /* Process option/argument pairs.  dprintf_command
     requires that processing stop on ','.  */
  while ((*argp)[0] != '\0' && (*argp)[0] != ',')
    {
      int len;
      const char *start;

      /* If *ARGP starts with a keyword, stop processing
	 options.  */
      if (linespec_lexer_lex_keyword (*argp) != NULL)
	break;

      /* Mark the start of the string in case we need to rewind.  */
      start = *argp;

      /* Get the option string.  */
      gdb::unique_xmalloc_ptr<char> opt
	= explicit_location_lex_one (argp, language);

      *argp = skip_spaces_const (*argp);

      /* Get the argument string.  */
      gdb::unique_xmalloc_ptr<char> oarg
	= explicit_location_lex_one (argp, language);
      bool have_oarg = oarg != NULL;
      *argp = skip_spaces_const (*argp);

      /* Use the length of the option to allow abbreviations.  */
      len = strlen (opt.get ());

      /* All options have a required argument.  Checking for this required
	 argument is deferred until later.  */
      if (strncmp (opt.get (), "-source", len) == 0)
	EL_EXPLICIT (location)->source_filename = oarg.release ();
      else if (strncmp (opt.get (), "-function", len) == 0)
	EL_EXPLICIT (location)->function_name = oarg.release ();
      else if (strncmp (opt.get (), "-line", len) == 0)
	{
	  if (have_oarg)
	    EL_EXPLICIT (location)->line_offset
	      = linespec_parse_line_offset (oarg.get ());
	}
      else if (strncmp (opt.get (), "-label", len) == 0)
	EL_EXPLICIT (location)->label_name = oarg.release ();
      /* Only emit an "invalid argument" error for options
	 that look like option strings.  */
      else if (opt.get ()[0] == '-' && !isdigit (opt.get ()[1]))
	{
	  if (!dont_throw)
	    error (_("invalid explicit location argument, \"%s\""), opt.get ());
	}
      else
	{
	  /* End of the explicit location specification.
	     Stop parsing and return whatever explicit location was
	     parsed.  */
	  *argp = start;
	  return location;
	}

      /* It's a little lame to error after the fact, but in this
	 case, it provides a much better user experience to issue
	 the "invalid argument" error before any missing
	 argument error.  */
      if (!have_oarg && !dont_throw)
	error (_("missing argument for \"%s\""), opt.get ());
    }

  /* One special error check:  If a source filename was given
     without offset, function, or label, issue an error.  */
  if (EL_EXPLICIT (location)->source_filename != NULL
      && EL_EXPLICIT (location)->function_name == NULL
      && EL_EXPLICIT (location)->label_name == NULL
      && (EL_EXPLICIT (location)->line_offset.sign == LINE_OFFSET_UNKNOWN)
      && !dont_throw)
    {
      error (_("Source filename requires function, label, or "
	       "line offset."));
    }

  return location;
}

/* See description in location.h.  */

event_location_up
string_to_event_location_basic (char **stringp,
				const struct language_defn *language)
{
  event_location_up location;
  const char *cs;

  /* Try the input as a probe spec.  */
  cs = *stringp;
  if (cs != NULL && probe_linespec_to_ops (&cs) != NULL)
    {
      location = new_probe_location (*stringp);
      *stringp += strlen (*stringp);
    }
  else
    {
      /* Try an address location.  */
      if (*stringp != NULL && **stringp == '*')
	{
	  const char *arg, *orig;
	  CORE_ADDR addr;

	  orig = arg = *stringp;
	  addr = linespec_expression_to_pc (&arg);
	  location = new_address_location (addr, orig, arg - orig);
	  *stringp += arg - orig;
	}
      else
	{
	  /* Everything else is a linespec.  */
	  location = new_linespec_location (stringp);
	}
    }

  return location;
}

/* See description in location.h.  */

event_location_up
string_to_event_location (char **stringp,
			  const struct language_defn *language)
{
  const char *arg, *orig;

  /* Try an explicit location.  */
  orig = arg = *stringp;
  event_location_up location = string_to_explicit_location (&arg, language, 0);
  if (location != NULL)
    {
      /* It was a valid explicit location.  Advance STRINGP to
	 the end of input.  */
      *stringp += arg - orig;
    }
  else
    {
      /* Everything else is a "basic" linespec, address, or probe
	 location.  */
      location = string_to_event_location_basic (stringp, language);
    }

  return location;
}

/* See description in location.h.  */

int
event_location_empty_p (const struct event_location *location)
{
  switch (EL_TYPE (location))
    {
    case LINESPEC_LOCATION:
      /* Linespecs are never "empty."  (NULL is a valid linespec)  */
      return 0;

    case ADDRESS_LOCATION:
      return 0;

    case EXPLICIT_LOCATION:
      return (EL_EXPLICIT (location) == NULL
	      || (EL_EXPLICIT (location)->source_filename == NULL
		  && EL_EXPLICIT (location)->function_name == NULL
		  && EL_EXPLICIT (location)->label_name == NULL
		  && (EL_EXPLICIT (location)->line_offset.sign
		      == LINE_OFFSET_UNKNOWN)));

    case PROBE_LOCATION:
      return EL_PROBE (location) == NULL;

    default:
      gdb_assert_not_reached ("unknown event location type");
    }
}

/* See description in location.h.  */

void
set_event_location_string (struct event_location *location,
			   const char *string)
{
  xfree (EL_STRING (location));
  EL_STRING (location) = string == NULL ?  NULL : xstrdup (string);
}