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[binutils.git] / binutils / rddbg.c
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1 /* rddbg.c -- Read debugging information into a generic form.
2 Copyright 1995, 1996, 1997, 2000, 2002, 2003, 2005, 2007, 2008,
3 2010 Free Software Foundation, Inc.
4 Written by Ian Lance Taylor <ian@cygnus.com>.
6 This file is part of GNU Binutils.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
21 02110-1301, USA. */
24 /* This file reads debugging information into a generic form. This
25 file knows how to dig the debugging information out of an object
26 file. */
28 #include "sysdep.h"
29 #include "bfd.h"
30 #include "libiberty.h"
31 #include "bucomm.h"
32 #include "debug.h"
33 #include "budbg.h"
35 static bfd_boolean read_section_stabs_debugging_info
36 (bfd *, asymbol **, long, void *, bfd_boolean *);
37 static bfd_boolean read_symbol_stabs_debugging_info
38 (bfd *, asymbol **, long, void *, bfd_boolean *);
39 static bfd_boolean read_ieee_debugging_info (bfd *, void *, bfd_boolean *);
40 static void save_stab (int, int, bfd_vma, const char *);
41 static void stab_context (void);
42 static void free_saved_stabs (void);
44 /* Read debugging information from a BFD. Returns a generic debugging
45 pointer. */
47 void *
48 read_debugging_info (bfd *abfd, asymbol **syms, long symcount, bfd_boolean no_messages)
50 void *dhandle;
51 bfd_boolean found;
53 dhandle = debug_init ();
54 if (dhandle == NULL)
55 return NULL;
57 if (! read_section_stabs_debugging_info (abfd, syms, symcount, dhandle,
58 &found))
59 return NULL;
61 if (bfd_get_flavour (abfd) == bfd_target_aout_flavour)
63 if (! read_symbol_stabs_debugging_info (abfd, syms, symcount, dhandle,
64 &found))
65 return NULL;
68 if (bfd_get_flavour (abfd) == bfd_target_ieee_flavour)
70 if (! read_ieee_debugging_info (abfd, dhandle, &found))
71 return NULL;
74 /* Try reading the COFF symbols if we didn't find any stabs in COFF
75 sections. */
76 if (! found
77 && bfd_get_flavour (abfd) == bfd_target_coff_flavour
78 && symcount > 0)
80 if (! parse_coff (abfd, syms, symcount, dhandle))
81 return NULL;
82 found = TRUE;
85 if (! found)
87 if (! no_messages)
88 non_fatal (_("%s: no recognized debugging information"),
89 bfd_get_filename (abfd));
90 return NULL;
93 return dhandle;
96 /* Read stabs in sections debugging information from a BFD. */
98 static bfd_boolean
99 read_section_stabs_debugging_info (bfd *abfd, asymbol **syms, long symcount,
100 void *dhandle, bfd_boolean *pfound)
102 static struct
104 const char *secname;
105 const char *strsecname;
107 names[] =
109 { ".stab", ".stabstr" },
110 { "LC_SYMTAB.stabs", "LC_SYMTAB.stabstr" },
111 { "$GDB_SYMBOLS$", "$GDB_STRINGS$" }
113 unsigned int i;
114 void *shandle;
116 *pfound = FALSE;
117 shandle = NULL;
119 for (i = 0; i < sizeof names / sizeof names[0]; i++)
121 asection *sec, *strsec;
123 sec = bfd_get_section_by_name (abfd, names[i].secname);
124 strsec = bfd_get_section_by_name (abfd, names[i].strsecname);
125 if (sec != NULL && strsec != NULL)
127 bfd_size_type stabsize, strsize;
128 bfd_byte *stabs, *strings;
129 bfd_byte *stab;
130 bfd_size_type stroff, next_stroff;
132 stabsize = bfd_section_size (abfd, sec);
133 stabs = (bfd_byte *) xmalloc (stabsize);
134 if (! bfd_get_section_contents (abfd, sec, stabs, 0, stabsize))
136 fprintf (stderr, "%s: %s: %s\n",
137 bfd_get_filename (abfd), names[i].secname,
138 bfd_errmsg (bfd_get_error ()));
139 return FALSE;
142 strsize = bfd_section_size (abfd, strsec);
143 strings = (bfd_byte *) xmalloc (strsize);
144 if (! bfd_get_section_contents (abfd, strsec, strings, 0, strsize))
146 fprintf (stderr, "%s: %s: %s\n",
147 bfd_get_filename (abfd), names[i].strsecname,
148 bfd_errmsg (bfd_get_error ()));
149 return FALSE;
152 if (shandle == NULL)
154 shandle = start_stab (dhandle, abfd, TRUE, syms, symcount);
155 if (shandle == NULL)
156 return FALSE;
159 *pfound = TRUE;
161 stroff = 0;
162 next_stroff = 0;
163 for (stab = stabs; stab < stabs + stabsize; stab += 12)
165 unsigned int strx;
166 int type;
167 int other ATTRIBUTE_UNUSED;
168 int desc;
169 bfd_vma value;
171 /* This code presumes 32 bit values. */
173 strx = bfd_get_32 (abfd, stab);
174 type = bfd_get_8 (abfd, stab + 4);
175 other = bfd_get_8 (abfd, stab + 5);
176 desc = bfd_get_16 (abfd, stab + 6);
177 value = bfd_get_32 (abfd, stab + 8);
179 if (type == 0)
181 /* Special type 0 stabs indicate the offset to the
182 next string table. */
183 stroff = next_stroff;
184 next_stroff += value;
186 else
188 char *f, *s;
190 f = NULL;
192 if (stroff + strx > strsize)
194 fprintf (stderr, "%s: %s: stab entry %ld is corrupt, strx = 0x%x, type = %d\n",
195 bfd_get_filename (abfd), names[i].secname,
196 (long) (stab - stabs) / 12, strx, type);
197 continue;
200 s = (char *) strings + stroff + strx;
202 while (s[strlen (s) - 1] == '\\'
203 && stab + 12 < stabs + stabsize)
205 char *p;
207 stab += 12;
208 p = s + strlen (s) - 1;
209 *p = '\0';
210 s = concat (s,
211 ((char *) strings
212 + stroff
213 + bfd_get_32 (abfd, stab)),
214 (const char *) NULL);
216 /* We have to restore the backslash, because, if
217 the linker is hashing stabs strings, we may
218 see the same string more than once. */
219 *p = '\\';
221 if (f != NULL)
222 free (f);
223 f = s;
226 save_stab (type, desc, value, s);
228 if (! parse_stab (dhandle, shandle, type, desc, value, s))
230 stab_context ();
231 free_saved_stabs ();
232 return FALSE;
235 /* Don't free f, since I think the stabs code
236 expects strings to hang around. This should be
237 straightened out. FIXME. */
241 free_saved_stabs ();
242 free (stabs);
244 /* Don't free strings, since I think the stabs code expects
245 the strings to hang around. This should be straightened
246 out. FIXME. */
250 if (shandle != NULL)
252 if (! finish_stab (dhandle, shandle))
253 return FALSE;
256 return TRUE;
259 /* Read stabs in the symbol table. */
261 static bfd_boolean
262 read_symbol_stabs_debugging_info (bfd *abfd, asymbol **syms, long symcount,
263 void *dhandle, bfd_boolean *pfound)
265 void *shandle;
266 asymbol **ps, **symend;
268 shandle = NULL;
269 symend = syms + symcount;
270 for (ps = syms; ps < symend; ps++)
272 symbol_info i;
274 bfd_get_symbol_info (abfd, *ps, &i);
276 if (i.type == '-')
278 const char *s;
279 char *f;
281 if (shandle == NULL)
283 shandle = start_stab (dhandle, abfd, FALSE, syms, symcount);
284 if (shandle == NULL)
285 return FALSE;
288 *pfound = TRUE;
290 s = i.name;
291 f = NULL;
292 while (s[strlen (s) - 1] == '\\'
293 && ps + 1 < symend)
295 char *sc, *n;
297 ++ps;
298 sc = xstrdup (s);
299 sc[strlen (sc) - 1] = '\0';
300 n = concat (sc, bfd_asymbol_name (*ps), (const char *) NULL);
301 free (sc);
302 if (f != NULL)
303 free (f);
304 f = n;
305 s = n;
308 save_stab (i.stab_type, i.stab_desc, i.value, s);
310 if (! parse_stab (dhandle, shandle, i.stab_type, i.stab_desc,
311 i.value, s))
313 stab_context ();
314 free_saved_stabs ();
315 return FALSE;
318 /* Don't free f, since I think the stabs code expects
319 strings to hang around. This should be straightened out.
320 FIXME. */
324 free_saved_stabs ();
326 if (shandle != NULL)
328 if (! finish_stab (dhandle, shandle))
329 return FALSE;
332 return TRUE;
335 /* Read IEEE debugging information. */
337 static bfd_boolean
338 read_ieee_debugging_info (bfd *abfd, void *dhandle, bfd_boolean *pfound)
340 asection *dsec;
341 bfd_size_type size;
342 bfd_byte *contents;
344 /* The BFD backend puts the debugging information into a section
345 named .debug. */
347 dsec = bfd_get_section_by_name (abfd, ".debug");
348 if (dsec == NULL)
349 return TRUE;
351 size = bfd_section_size (abfd, dsec);
352 contents = (bfd_byte *) xmalloc (size);
353 if (! bfd_get_section_contents (abfd, dsec, contents, 0, size))
354 return FALSE;
356 if (! parse_ieee (dhandle, abfd, contents, size))
357 return FALSE;
359 free (contents);
361 *pfound = TRUE;
363 return TRUE;
366 /* Record stabs strings, so that we can give some context for errors. */
368 #define SAVE_STABS_COUNT (16)
370 struct saved_stab
372 int type;
373 int desc;
374 bfd_vma value;
375 char *string;
378 static struct saved_stab saved_stabs[SAVE_STABS_COUNT];
379 static int saved_stabs_index;
381 /* Save a stabs string. */
383 static void
384 save_stab (int type, int desc, bfd_vma value, const char *string)
386 if (saved_stabs[saved_stabs_index].string != NULL)
387 free (saved_stabs[saved_stabs_index].string);
388 saved_stabs[saved_stabs_index].type = type;
389 saved_stabs[saved_stabs_index].desc = desc;
390 saved_stabs[saved_stabs_index].value = value;
391 saved_stabs[saved_stabs_index].string = xstrdup (string);
392 saved_stabs_index = (saved_stabs_index + 1) % SAVE_STABS_COUNT;
395 /* Provide context for an error. */
397 static void
398 stab_context (void)
400 int i;
402 fprintf (stderr, _("Last stabs entries before error:\n"));
403 fprintf (stderr, "n_type n_desc n_value string\n");
405 i = saved_stabs_index;
408 struct saved_stab *stabp;
410 stabp = saved_stabs + i;
411 if (stabp->string != NULL)
413 const char *s;
415 s = bfd_get_stab_name (stabp->type);
416 if (s != NULL)
417 fprintf (stderr, "%-6s", s);
418 else if (stabp->type == 0)
419 fprintf (stderr, "HdrSym");
420 else
421 fprintf (stderr, "%-6d", stabp->type);
422 fprintf (stderr, " %-6d ", stabp->desc);
423 fprintf_vma (stderr, stabp->value);
424 if (stabp->type != 0)
425 fprintf (stderr, " %s", stabp->string);
426 fprintf (stderr, "\n");
428 i = (i + 1) % SAVE_STABS_COUNT;
430 while (i != saved_stabs_index);
433 /* Free the saved stab strings. */
435 static void
436 free_saved_stabs (void)
438 int i;
440 for (i = 0; i < SAVE_STABS_COUNT; i++)
442 if (saved_stabs[i].string != NULL)
444 free (saved_stabs[i].string);
445 saved_stabs[i].string = NULL;
449 saved_stabs_index = 0;