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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
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 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)
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 non_fatal (_("%s: no recognized debugging information"),
88 bfd_get_filename (abfd));
89 return NULL;
92 return dhandle;
95 /* Read stabs in sections debugging information from a BFD. */
97 static bfd_boolean
98 read_section_stabs_debugging_info (bfd *abfd, asymbol **syms, long symcount,
99 void *dhandle, bfd_boolean *pfound)
101 static struct
103 const char *secname;
104 const char *strsecname;
106 names[] =
108 { ".stab", ".stabstr" },
109 { "LC_SYMTAB.stabs", "LC_SYMTAB.stabstr" },
110 { "$GDB_SYMBOLS$", "$GDB_STRINGS$" }
112 unsigned int i;
113 void *shandle;
115 *pfound = FALSE;
116 shandle = NULL;
118 for (i = 0; i < sizeof names / sizeof names[0]; i++)
120 asection *sec, *strsec;
122 sec = bfd_get_section_by_name (abfd, names[i].secname);
123 strsec = bfd_get_section_by_name (abfd, names[i].strsecname);
124 if (sec != NULL && strsec != NULL)
126 bfd_size_type stabsize, strsize;
127 bfd_byte *stabs, *strings;
128 bfd_byte *stab;
129 bfd_size_type stroff, next_stroff;
131 stabsize = bfd_section_size (abfd, sec);
132 stabs = (bfd_byte *) xmalloc (stabsize);
133 if (! bfd_get_section_contents (abfd, sec, stabs, 0, stabsize))
135 fprintf (stderr, "%s: %s: %s\n",
136 bfd_get_filename (abfd), names[i].secname,
137 bfd_errmsg (bfd_get_error ()));
138 return FALSE;
141 strsize = bfd_section_size (abfd, strsec);
142 strings = (bfd_byte *) xmalloc (strsize);
143 if (! bfd_get_section_contents (abfd, strsec, strings, 0, strsize))
145 fprintf (stderr, "%s: %s: %s\n",
146 bfd_get_filename (abfd), names[i].strsecname,
147 bfd_errmsg (bfd_get_error ()));
148 return FALSE;
151 if (shandle == NULL)
153 shandle = start_stab (dhandle, abfd, TRUE, syms, symcount);
154 if (shandle == NULL)
155 return FALSE;
158 *pfound = TRUE;
160 stroff = 0;
161 next_stroff = 0;
162 for (stab = stabs; stab < stabs + stabsize; stab += 12)
164 unsigned int strx;
165 int type;
166 int other;
167 int desc;
168 bfd_vma value;
170 /* This code presumes 32 bit values. */
172 strx = bfd_get_32 (abfd, stab);
173 type = bfd_get_8 (abfd, stab + 4);
174 other = bfd_get_8 (abfd, stab + 5);
175 desc = bfd_get_16 (abfd, stab + 6);
176 value = bfd_get_32 (abfd, stab + 8);
178 if (type == 0)
180 /* Special type 0 stabs indicate the offset to the
181 next string table. */
182 stroff = next_stroff;
183 next_stroff += value;
185 else
187 char *f, *s;
189 f = NULL;
191 if (stroff + strx > strsize)
193 fprintf (stderr, "%s: %s: stab entry %ld is corrupt, strx = 0x%x, type = %d\n",
194 bfd_get_filename (abfd), names[i].secname,
195 (long) (stab - stabs) / 12, strx, type);
196 continue;
199 s = (char *) strings + stroff + strx;
201 while (s[strlen (s) - 1] == '\\'
202 && stab + 12 < stabs + stabsize)
204 char *p;
206 stab += 12;
207 p = s + strlen (s) - 1;
208 *p = '\0';
209 s = concat (s,
210 ((char *) strings
211 + stroff
212 + bfd_get_32 (abfd, stab)),
213 (const char *) NULL);
215 /* We have to restore the backslash, because, if
216 the linker is hashing stabs strings, we may
217 see the same string more than once. */
218 *p = '\\';
220 if (f != NULL)
221 free (f);
222 f = s;
225 save_stab (type, desc, value, s);
227 if (! parse_stab (dhandle, shandle, type, desc, value, s))
229 stab_context ();
230 free_saved_stabs ();
231 return FALSE;
234 /* Don't free f, since I think the stabs code
235 expects strings to hang around. This should be
236 straightened out. FIXME. */
240 free_saved_stabs ();
241 free (stabs);
243 /* Don't free strings, since I think the stabs code expects
244 the strings to hang around. This should be straightened
245 out. FIXME. */
249 if (shandle != NULL)
251 if (! finish_stab (dhandle, shandle))
252 return FALSE;
255 return TRUE;
258 /* Read stabs in the symbol table. */
260 static bfd_boolean
261 read_symbol_stabs_debugging_info (bfd *abfd, asymbol **syms, long symcount,
262 void *dhandle, bfd_boolean *pfound)
264 void *shandle;
265 asymbol **ps, **symend;
267 shandle = NULL;
268 symend = syms + symcount;
269 for (ps = syms; ps < symend; ps++)
271 symbol_info i;
273 bfd_get_symbol_info (abfd, *ps, &i);
275 if (i.type == '-')
277 const char *s;
278 char *f;
280 if (shandle == NULL)
282 shandle = start_stab (dhandle, abfd, FALSE, syms, symcount);
283 if (shandle == NULL)
284 return FALSE;
287 *pfound = TRUE;
289 s = i.name;
290 f = NULL;
291 while (s[strlen (s) - 1] == '\\'
292 && ps + 1 < symend)
294 char *sc, *n;
296 ++ps;
297 sc = xstrdup (s);
298 sc[strlen (sc) - 1] = '\0';
299 n = concat (sc, bfd_asymbol_name (*ps), (const char *) NULL);
300 free (sc);
301 if (f != NULL)
302 free (f);
303 f = n;
304 s = n;
307 save_stab (i.stab_type, i.stab_desc, i.value, s);
309 if (! parse_stab (dhandle, shandle, i.stab_type, i.stab_desc,
310 i.value, s))
312 stab_context ();
313 free_saved_stabs ();
314 return FALSE;
317 /* Don't free f, since I think the stabs code expects
318 strings to hang around. This should be straightened out.
319 FIXME. */
323 free_saved_stabs ();
325 if (shandle != NULL)
327 if (! finish_stab (dhandle, shandle))
328 return FALSE;
331 return TRUE;
334 /* Read IEEE debugging information. */
336 static bfd_boolean
337 read_ieee_debugging_info (bfd *abfd, void *dhandle, bfd_boolean *pfound)
339 asection *dsec;
340 bfd_size_type size;
341 bfd_byte *contents;
343 /* The BFD backend puts the debugging information into a section
344 named .debug. */
346 dsec = bfd_get_section_by_name (abfd, ".debug");
347 if (dsec == NULL)
348 return TRUE;
350 size = bfd_section_size (abfd, dsec);
351 contents = (bfd_byte *) xmalloc (size);
352 if (! bfd_get_section_contents (abfd, dsec, contents, 0, size))
353 return FALSE;
355 if (! parse_ieee (dhandle, abfd, contents, size))
356 return FALSE;
358 free (contents);
360 *pfound = TRUE;
362 return TRUE;
365 /* Record stabs strings, so that we can give some context for errors. */
367 #define SAVE_STABS_COUNT (16)
369 struct saved_stab
371 int type;
372 int desc;
373 bfd_vma value;
374 char *string;
377 static struct saved_stab saved_stabs[SAVE_STABS_COUNT];
378 static int saved_stabs_index;
380 /* Save a stabs string. */
382 static void
383 save_stab (int type, int desc, bfd_vma value, const char *string)
385 if (saved_stabs[saved_stabs_index].string != NULL)
386 free (saved_stabs[saved_stabs_index].string);
387 saved_stabs[saved_stabs_index].type = type;
388 saved_stabs[saved_stabs_index].desc = desc;
389 saved_stabs[saved_stabs_index].value = value;
390 saved_stabs[saved_stabs_index].string = xstrdup (string);
391 saved_stabs_index = (saved_stabs_index + 1) % SAVE_STABS_COUNT;
394 /* Provide context for an error. */
396 static void
397 stab_context (void)
399 int i;
401 fprintf (stderr, _("Last stabs entries before error:\n"));
402 fprintf (stderr, "n_type n_desc n_value string\n");
404 i = saved_stabs_index;
407 struct saved_stab *stabp;
409 stabp = saved_stabs + i;
410 if (stabp->string != NULL)
412 const char *s;
414 s = bfd_get_stab_name (stabp->type);
415 if (s != NULL)
416 fprintf (stderr, "%-6s", s);
417 else if (stabp->type == 0)
418 fprintf (stderr, "HdrSym");
419 else
420 fprintf (stderr, "%-6d", stabp->type);
421 fprintf (stderr, " %-6d ", stabp->desc);
422 fprintf_vma (stderr, stabp->value);
423 if (stabp->type != 0)
424 fprintf (stderr, " %s", stabp->string);
425 fprintf (stderr, "\n");
427 i = (i + 1) % SAVE_STABS_COUNT;
429 while (i != saved_stabs_index);
432 /* Free the saved stab strings. */
434 static void
435 free_saved_stabs (void)
437 int i;
439 for (i = 0; i < SAVE_STABS_COUNT; i++)
441 if (saved_stabs[i].string != NULL)
443 free (saved_stabs[i].string);
444 saved_stabs[i].string = NULL;
448 saved_stabs_index = 0;