bfd/
[binutils.git] / binutils / rddbg.c
blobe977d8b5ef14000697aac3e76d44497cfbf9e7c3
1 /* rddbg.c -- Read debugging information into a generic form.
2 Copyright 1995, 1996, 1997, 2000, 2002, 2003, 2005
3 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 2 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. */
23 /* This file reads debugging information into a generic form. This
24 file knows how to dig the debugging information out of an object
25 file. */
27 #include "bfd.h"
28 #include "bucomm.h"
29 #include "libiberty.h"
30 #include "debug.h"
31 #include "budbg.h"
33 static bfd_boolean read_section_stabs_debugging_info
34 (bfd *, asymbol **, long, void *, bfd_boolean *);
35 static bfd_boolean read_symbol_stabs_debugging_info
36 (bfd *, asymbol **, long, void *, bfd_boolean *);
37 static bfd_boolean read_ieee_debugging_info (bfd *, void *, bfd_boolean *);
38 static void save_stab (int, int, bfd_vma, const char *);
39 static void stab_context (void);
40 static void free_saved_stabs (void);
42 /* Read debugging information from a BFD. Returns a generic debugging
43 pointer. */
45 void *
46 read_debugging_info (bfd *abfd, asymbol **syms, long symcount)
48 void *dhandle;
49 bfd_boolean found;
51 dhandle = debug_init ();
52 if (dhandle == NULL)
53 return NULL;
55 if (! read_section_stabs_debugging_info (abfd, syms, symcount, dhandle,
56 &found))
57 return NULL;
59 if (bfd_get_flavour (abfd) == bfd_target_aout_flavour)
61 if (! read_symbol_stabs_debugging_info (abfd, syms, symcount, dhandle,
62 &found))
63 return NULL;
66 if (bfd_get_flavour (abfd) == bfd_target_ieee_flavour)
68 if (! read_ieee_debugging_info (abfd, dhandle, &found))
69 return NULL;
72 /* Try reading the COFF symbols if we didn't find any stabs in COFF
73 sections. */
74 if (! found
75 && bfd_get_flavour (abfd) == bfd_target_coff_flavour
76 && symcount > 0)
78 if (! parse_coff (abfd, syms, symcount, dhandle))
79 return NULL;
80 found = TRUE;
83 if (! found)
85 non_fatal (_("%s: no recognized debugging information"),
86 bfd_get_filename (abfd));
87 return NULL;
90 return dhandle;
93 /* Read stabs in sections debugging information from a BFD. */
95 static bfd_boolean
96 read_section_stabs_debugging_info (bfd *abfd, asymbol **syms, long symcount,
97 void *dhandle, bfd_boolean *pfound)
99 static struct
101 const char *secname;
102 const char *strsecname;
104 names[] =
106 { ".stab", ".stabstr" },
107 { "LC_SYMTAB.stabs", "LC_SYMTAB.stabstr" },
108 { "$GDB_SYMBOLS$", "$GDB_STRINGS$" }
110 unsigned int i;
111 void *shandle;
113 *pfound = FALSE;
114 shandle = NULL;
116 for (i = 0; i < sizeof names / sizeof names[0]; i++)
118 asection *sec, *strsec;
120 sec = bfd_get_section_by_name (abfd, names[i].secname);
121 strsec = bfd_get_section_by_name (abfd, names[i].strsecname);
122 if (sec != NULL && strsec != NULL)
124 bfd_size_type stabsize, strsize;
125 bfd_byte *stabs, *strings;
126 bfd_byte *stab;
127 bfd_size_type stroff, next_stroff;
129 stabsize = bfd_section_size (abfd, sec);
130 stabs = (bfd_byte *) xmalloc (stabsize);
131 if (! bfd_get_section_contents (abfd, sec, stabs, 0, stabsize))
133 fprintf (stderr, "%s: %s: %s\n",
134 bfd_get_filename (abfd), names[i].secname,
135 bfd_errmsg (bfd_get_error ()));
136 return FALSE;
139 strsize = bfd_section_size (abfd, strsec);
140 strings = (bfd_byte *) xmalloc (strsize);
141 if (! bfd_get_section_contents (abfd, strsec, strings, 0, strsize))
143 fprintf (stderr, "%s: %s: %s\n",
144 bfd_get_filename (abfd), names[i].strsecname,
145 bfd_errmsg (bfd_get_error ()));
146 return FALSE;
149 if (shandle == NULL)
151 shandle = start_stab (dhandle, abfd, TRUE, syms, symcount);
152 if (shandle == NULL)
153 return FALSE;
156 *pfound = TRUE;
158 stroff = 0;
159 next_stroff = 0;
160 for (stab = stabs; stab < stabs + stabsize; stab += 12)
162 unsigned int strx;
163 int type;
164 int other;
165 int desc;
166 bfd_vma value;
168 /* This code presumes 32 bit values. */
170 strx = bfd_get_32 (abfd, stab);
171 type = bfd_get_8 (abfd, stab + 4);
172 other = bfd_get_8 (abfd, stab + 5);
173 desc = bfd_get_16 (abfd, stab + 6);
174 value = bfd_get_32 (abfd, stab + 8);
176 if (type == 0)
178 /* Special type 0 stabs indicate the offset to the
179 next string table. */
180 stroff = next_stroff;
181 next_stroff += value;
183 else
185 char *f, *s;
187 f = NULL;
189 if (stroff + strx > strsize)
191 fprintf (stderr, "%s: %s: stab entry %ld is corrupt, strx = 0x%x, type = %d\n",
192 bfd_get_filename (abfd), names[i].secname,
193 (long) (stab - stabs) / 12, strx, type);
194 continue;
197 s = (char *) strings + stroff + strx;
199 while (s[strlen (s) - 1] == '\\'
200 && stab + 12 < stabs + stabsize)
202 char *p;
204 stab += 12;
205 p = s + strlen (s) - 1;
206 *p = '\0';
207 s = concat (s,
208 ((char *) strings
209 + stroff
210 + bfd_get_32 (abfd, stab)),
211 (const char *) NULL);
213 /* We have to restore the backslash, because, if
214 the linker is hashing stabs strings, we may
215 see the same string more than once. */
216 *p = '\\';
218 if (f != NULL)
219 free (f);
220 f = s;
223 save_stab (type, desc, value, s);
225 if (! parse_stab (dhandle, shandle, type, desc, value, s))
227 stab_context ();
228 free_saved_stabs ();
229 return FALSE;
232 /* Don't free f, since I think the stabs code
233 expects strings to hang around. This should be
234 straightened out. FIXME. */
238 free_saved_stabs ();
239 free (stabs);
241 /* Don't free strings, since I think the stabs code expects
242 the strings to hang around. This should be straightened
243 out. FIXME. */
247 if (shandle != NULL)
249 if (! finish_stab (dhandle, shandle))
250 return FALSE;
253 return TRUE;
256 /* Read stabs in the symbol table. */
258 static bfd_boolean
259 read_symbol_stabs_debugging_info (bfd *abfd, asymbol **syms, long symcount,
260 void *dhandle, bfd_boolean *pfound)
262 void *shandle;
263 asymbol **ps, **symend;
265 shandle = NULL;
266 symend = syms + symcount;
267 for (ps = syms; ps < symend; ps++)
269 symbol_info i;
271 bfd_get_symbol_info (abfd, *ps, &i);
273 if (i.type == '-')
275 const char *s;
276 char *f;
278 if (shandle == NULL)
280 shandle = start_stab (dhandle, abfd, FALSE, syms, symcount);
281 if (shandle == NULL)
282 return FALSE;
285 *pfound = TRUE;
287 s = i.name;
288 f = NULL;
289 while (s[strlen (s) - 1] == '\\'
290 && ps + 1 < symend)
292 char *sc, *n;
294 ++ps;
295 sc = xstrdup (s);
296 sc[strlen (sc) - 1] = '\0';
297 n = concat (sc, bfd_asymbol_name (*ps), (const char *) NULL);
298 free (sc);
299 if (f != NULL)
300 free (f);
301 f = n;
302 s = n;
305 save_stab (i.stab_type, i.stab_desc, i.value, s);
307 if (! parse_stab (dhandle, shandle, i.stab_type, i.stab_desc,
308 i.value, s))
310 stab_context ();
311 free_saved_stabs ();
312 return FALSE;
315 /* Don't free f, since I think the stabs code expects
316 strings to hang around. This should be straightened out.
317 FIXME. */
321 free_saved_stabs ();
323 if (shandle != NULL)
325 if (! finish_stab (dhandle, shandle))
326 return FALSE;
329 return TRUE;
332 /* Read IEEE debugging information. */
334 static bfd_boolean
335 read_ieee_debugging_info (bfd *abfd, void *dhandle, bfd_boolean *pfound)
337 asection *dsec;
338 bfd_size_type size;
339 bfd_byte *contents;
341 /* The BFD backend puts the debugging information into a section
342 named .debug. */
344 dsec = bfd_get_section_by_name (abfd, ".debug");
345 if (dsec == NULL)
346 return TRUE;
348 size = bfd_section_size (abfd, dsec);
349 contents = (bfd_byte *) xmalloc (size);
350 if (! bfd_get_section_contents (abfd, dsec, contents, 0, size))
351 return FALSE;
353 if (! parse_ieee (dhandle, abfd, contents, size))
354 return FALSE;
356 free (contents);
358 *pfound = TRUE;
360 return TRUE;
363 /* Record stabs strings, so that we can give some context for errors. */
365 #define SAVE_STABS_COUNT (16)
367 struct saved_stab
369 int type;
370 int desc;
371 bfd_vma value;
372 char *string;
375 static struct saved_stab saved_stabs[SAVE_STABS_COUNT];
376 static int saved_stabs_index;
378 /* Save a stabs string. */
380 static void
381 save_stab (int type, int desc, bfd_vma value, const char *string)
383 if (saved_stabs[saved_stabs_index].string != NULL)
384 free (saved_stabs[saved_stabs_index].string);
385 saved_stabs[saved_stabs_index].type = type;
386 saved_stabs[saved_stabs_index].desc = desc;
387 saved_stabs[saved_stabs_index].value = value;
388 saved_stabs[saved_stabs_index].string = xstrdup (string);
389 saved_stabs_index = (saved_stabs_index + 1) % SAVE_STABS_COUNT;
392 /* Provide context for an error. */
394 static void
395 stab_context (void)
397 int i;
399 fprintf (stderr, _("Last stabs entries before error:\n"));
400 fprintf (stderr, "n_type n_desc n_value string\n");
402 i = saved_stabs_index;
405 struct saved_stab *stabp;
407 stabp = saved_stabs + i;
408 if (stabp->string != NULL)
410 const char *s;
412 s = bfd_get_stab_name (stabp->type);
413 if (s != NULL)
414 fprintf (stderr, "%-6s", s);
415 else if (stabp->type == 0)
416 fprintf (stderr, "HdrSym");
417 else
418 fprintf (stderr, "%-6d", stabp->type);
419 fprintf (stderr, " %-6d ", stabp->desc);
420 fprintf_vma (stderr, stabp->value);
421 if (stabp->type != 0)
422 fprintf (stderr, " %s", stabp->string);
423 fprintf (stderr, "\n");
425 i = (i + 1) % SAVE_STABS_COUNT;
427 while (i != saved_stabs_index);
430 /* Free the saved stab strings. */
432 static void
433 free_saved_stabs (void)
435 int i;
437 for (i = 0; i < SAVE_STABS_COUNT; i++)
439 if (saved_stabs[i].string != NULL)
441 free (saved_stabs[i].string);
442 saved_stabs[i].string = NULL;
446 saved_stabs_index = 0;