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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [bfd/] [format.c] - Blame information for rev 225

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1 24 jeremybenn
/* Generic BFD support for file formats.
2
   Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1999, 2000, 2001, 2002,
3 225 jeremybenn
   2003, 2005, 2007, 2008, 2009 Free Software Foundation, Inc.
4 24 jeremybenn
   Written by Cygnus Support.
5
 
6
   This file is part of BFD, the Binary File Descriptor library.
7
 
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.
12
 
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.
17
 
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,
21
   MA 02110-1301, USA.  */
22
 
23
 
24
/*
25
SECTION
26
        File formats
27
 
28
        A format is a BFD concept of high level file contents type. The
29
        formats supported by BFD are:
30
 
31
        o <<bfd_object>>
32
 
33
        The BFD may contain data, symbols, relocations and debug info.
34
 
35
        o <<bfd_archive>>
36
 
37
        The BFD contains other BFDs and an optional index.
38
 
39
        o <<bfd_core>>
40
 
41
        The BFD contains the result of an executable core dump.
42
 
43
SUBSECTION
44
        File format functions
45
*/
46
 
47
#include "sysdep.h"
48
#include "bfd.h"
49
#include "libbfd.h"
50
 
51
/* IMPORT from targets.c.  */
52
extern const size_t _bfd_target_vector_entries;
53
 
54
/*
55
FUNCTION
56
        bfd_check_format
57
 
58
SYNOPSIS
59
        bfd_boolean bfd_check_format (bfd *abfd, bfd_format format);
60
 
61
DESCRIPTION
62
        Verify if the file attached to the BFD @var{abfd} is compatible
63
        with the format @var{format} (i.e., one of <<bfd_object>>,
64
        <<bfd_archive>> or <<bfd_core>>).
65
 
66
        If the BFD has been set to a specific target before the
67
        call, only the named target and format combination is
68
        checked. If the target has not been set, or has been set to
69
        <<default>>, then all the known target backends is
70
        interrogated to determine a match.  If the default target
71
        matches, it is used.  If not, exactly one target must recognize
72
        the file, or an error results.
73
 
74
        The function returns <<TRUE>> on success, otherwise <<FALSE>>
75
        with one of the following error codes:
76
 
77
        o <<bfd_error_invalid_operation>> -
78
        if <<format>> is not one of <<bfd_object>>, <<bfd_archive>> or
79
        <<bfd_core>>.
80
 
81
        o <<bfd_error_system_call>> -
82
        if an error occured during a read - even some file mismatches
83
        can cause bfd_error_system_calls.
84
 
85
        o <<file_not_recognised>> -
86
        none of the backends recognised the file format.
87
 
88
        o <<bfd_error_file_ambiguously_recognized>> -
89
        more than one backend recognised the file format.
90
*/
91
 
92
bfd_boolean
93
bfd_check_format (bfd *abfd, bfd_format format)
94
{
95
  return bfd_check_format_matches (abfd, format, NULL);
96
}
97
 
98
/*
99
FUNCTION
100
        bfd_check_format_matches
101
 
102
SYNOPSIS
103
        bfd_boolean bfd_check_format_matches
104
          (bfd *abfd, bfd_format format, char ***matching);
105
 
106
DESCRIPTION
107
        Like <<bfd_check_format>>, except when it returns FALSE with
108
        <<bfd_errno>> set to <<bfd_error_file_ambiguously_recognized>>.  In that
109
        case, if @var{matching} is not NULL, it will be filled in with
110
        a NULL-terminated list of the names of the formats that matched,
111
        allocated with <<malloc>>.
112
        Then the user may choose a format and try again.
113
 
114
        When done with the list that @var{matching} points to, the caller
115
        should free it.
116
*/
117
 
118
bfd_boolean
119
bfd_check_format_matches (bfd *abfd, bfd_format format, char ***matching)
120
{
121
  extern const bfd_target binary_vec;
122
  const bfd_target * const *target;
123
  const bfd_target **matching_vector = NULL;
124
  const bfd_target *save_targ, *right_targ, *ar_right_targ;
125
  int match_count;
126
  int ar_match_index;
127
 
128
  if (matching != NULL)
129
    *matching = NULL;
130
 
131
  if (!bfd_read_p (abfd)
132
      || (unsigned int) abfd->format >= (unsigned int) bfd_type_end)
133
    {
134
      bfd_set_error (bfd_error_invalid_operation);
135
      return FALSE;
136
    }
137
 
138
  if (abfd->format != bfd_unknown)
139
    return abfd->format == format;
140
 
141
  /* Since the target type was defaulted, check them
142
     all in the hope that one will be uniquely recognized.  */
143
  save_targ = abfd->xvec;
144
  match_count = 0;
145
  ar_match_index = _bfd_target_vector_entries;
146
 
147
  if (matching != NULL || *bfd_associated_vector != NULL)
148
    {
149
      bfd_size_type amt;
150
 
151
      amt = sizeof (*matching_vector) * 2 * _bfd_target_vector_entries;
152 225 jeremybenn
      matching_vector = (const bfd_target **) bfd_malloc (amt);
153 24 jeremybenn
      if (!matching_vector)
154
        return FALSE;
155
    }
156
 
157
  right_targ = 0;
158
  ar_right_targ = 0;
159
 
160
  /* Presume the answer is yes.  */
161
  abfd->format = format;
162
 
163
  /* If the target type was explicitly specified, just check that target.  */
164
  if (!abfd->target_defaulted)
165
    {
166
      if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0)   /* rewind! */
167
        goto err_ret;
168
 
169
      right_targ = BFD_SEND_FMT (abfd, _bfd_check_format, (abfd));
170
 
171
      if (right_targ)
172
        goto ok_ret;
173
 
174
      /* For a long time the code has dropped through to check all
175
         targets if the specified target was wrong.  I don't know why,
176
         and I'm reluctant to change it.  However, in the case of an
177
         archive, it can cause problems.  If the specified target does
178
         not permit archives (e.g., the binary target), then we should
179
         not allow some other target to recognize it as an archive, but
180
         should instead allow the specified target to recognize it as an
181
         object.  When I first made this change, it broke the PE target,
182
         because the specified pei-i386 target did not recognize the
183
         actual pe-i386 archive.  Since there may be other problems of
184
         this sort, I changed this test to check only for the binary
185
         target.  */
186
      if (format == bfd_archive && save_targ == &binary_vec)
187
        goto err_unrecog;
188
    }
189
 
190
  for (target = bfd_target_vector; *target != NULL; target++)
191
    {
192
      const bfd_target *temp;
193
      bfd_error_type err;
194
 
195
      /* Don't check the default target twice.  */
196
      if (*target == &binary_vec
197
          || (!abfd->target_defaulted && *target == save_targ))
198
        continue;
199
 
200
      abfd->xvec = *target;     /* Change BFD's target temporarily.  */
201
 
202
      if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0)
203
        goto err_ret;
204
 
205
      /* If _bfd_check_format neglects to set bfd_error, assume
206
         bfd_error_wrong_format.  We didn't used to even pay any
207
         attention to bfd_error, so I suspect that some
208
         _bfd_check_format might have this problem.  */
209
      bfd_set_error (bfd_error_wrong_format);
210
 
211
      temp = BFD_SEND_FMT (abfd, _bfd_check_format, (abfd));
212
 
213
      if (temp && (abfd->format != bfd_archive || bfd_has_map (abfd)))
214
        {
215
          /* This format checks out as ok!  */
216
          right_targ = temp;
217
 
218
          /* If this is the default target, accept it, even if other
219
             targets might match.  People who want those other targets
220
             have to set the GNUTARGET variable.  */
221
          if (temp == bfd_default_vector[0])
222
            {
223
              match_count = 1;
224
              break;
225
            }
226
 
227
          if (matching_vector)
228
            matching_vector[match_count] = temp;
229
          match_count++;
230
        }
231
      else if (temp
232
               || (err = bfd_get_error ()) == bfd_error_wrong_object_format
233
               || err == bfd_error_file_ambiguously_recognized)
234
        {
235
          /* An archive with no armap or objects of the wrong type,
236
             or an ambiguous match.  We want this target to match
237
             if we get no better matches.  */
238
          if (ar_right_targ != bfd_default_vector[0])
239
            ar_right_targ = *target;
240
          if (matching_vector)
241
            matching_vector[ar_match_index] = *target;
242
          ar_match_index++;
243
        }
244
      else if (err != bfd_error_wrong_format)
245
        goto err_ret;
246
    }
247
 
248
  if (match_count == 0)
249
    {
250
      /* Try partial matches.  */
251
      right_targ = ar_right_targ;
252
 
253
      if (right_targ == bfd_default_vector[0])
254
        {
255
          match_count = 1;
256
        }
257
      else
258
        {
259
          match_count = ar_match_index - _bfd_target_vector_entries;
260
 
261
          if (matching_vector && match_count > 1)
262
            memcpy (matching_vector,
263
                    matching_vector + _bfd_target_vector_entries,
264
                    sizeof (*matching_vector) * match_count);
265
        }
266
    }
267
 
268
  if (match_count > 1)
269
    {
270
      const bfd_target * const *assoc = bfd_associated_vector;
271
 
272
      while ((right_targ = *assoc++) != NULL)
273
        {
274
          int i = match_count;
275
 
276
          while (--i >= 0)
277
            if (matching_vector[i] == right_targ)
278
              break;
279
 
280
          if (i >= 0)
281
            {
282
              match_count = 1;
283
              break;
284
            }
285
        }
286
    }
287
 
288
  if (match_count == 1)
289
    {
290
    ok_ret:
291
      abfd->xvec = right_targ;          /* Change BFD's target permanently.  */
292
 
293
      /* If the file was opened for update, then `output_has_begun'
294
         some time ago when the file was created.  Do not recompute
295
         sections sizes or alignments in _bfd_set_section_contents.
296
         We can not set this flag until after checking the format,
297
         because it will interfere with creation of BFD sections.  */
298
      if (abfd->direction == both_direction)
299
        abfd->output_has_begun = TRUE;
300
 
301
      if (matching_vector)
302
        free (matching_vector);
303
      return TRUE;                      /* File position has moved, BTW.  */
304
    }
305
 
306
  if (match_count == 0)
307
    {
308
    err_unrecog:
309
      bfd_set_error (bfd_error_file_not_recognized);
310
    err_ret:
311
      abfd->xvec = save_targ;
312
      abfd->format = bfd_unknown;
313
      if (matching_vector)
314
        free (matching_vector);
315
      return FALSE;
316
    }
317
 
318
  abfd->xvec = save_targ;               /* Restore original target type.  */
319
  abfd->format = bfd_unknown;           /* Restore original format.  */
320
  bfd_set_error (bfd_error_file_ambiguously_recognized);
321
 
322
  if (matching)
323
    {
324
      *matching = (char **) matching_vector;
325
      matching_vector[match_count] = NULL;
326
      /* Return target names.  This is a little nasty.  Maybe we
327
         should do another bfd_malloc?  */
328
      while (--match_count >= 0)
329
        {
330
          const char *name = matching_vector[match_count]->name;
331
          *(const char **) &matching_vector[match_count] = name;
332
        }
333
    }
334
  return FALSE;
335
}
336
 
337
/*
338
FUNCTION
339
        bfd_set_format
340
 
341
SYNOPSIS
342
        bfd_boolean bfd_set_format (bfd *abfd, bfd_format format);
343
 
344
DESCRIPTION
345
        This function sets the file format of the BFD @var{abfd} to the
346
        format @var{format}. If the target set in the BFD does not
347
        support the format requested, the format is invalid, or the BFD
348
        is not open for writing, then an error occurs.
349
*/
350
 
351
bfd_boolean
352
bfd_set_format (bfd *abfd, bfd_format format)
353
{
354
  if (bfd_read_p (abfd)
355
      || (unsigned int) abfd->format >= (unsigned int) bfd_type_end)
356
    {
357
      bfd_set_error (bfd_error_invalid_operation);
358
      return FALSE;
359
    }
360
 
361
  if (abfd->format != bfd_unknown)
362
    return abfd->format == format;
363
 
364
  /* Presume the answer is yes.  */
365
  abfd->format = format;
366
 
367
  if (!BFD_SEND_FMT (abfd, _bfd_set_format, (abfd)))
368
    {
369
      abfd->format = bfd_unknown;
370
      return FALSE;
371
    }
372
 
373
  return TRUE;
374
}
375
 
376
/*
377
FUNCTION
378
        bfd_format_string
379
 
380
SYNOPSIS
381
        const char *bfd_format_string (bfd_format format);
382
 
383
DESCRIPTION
384
        Return a pointer to a const string
385
        <<invalid>>, <<object>>, <<archive>>, <<core>>, or <<unknown>>,
386
        depending upon the value of @var{format}.
387
*/
388
 
389
const char *
390
bfd_format_string (bfd_format format)
391
{
392
  if (((int) format < (int) bfd_unknown)
393
      || ((int) format >= (int) bfd_type_end))
394
    return "invalid";
395
 
396
  switch (format)
397
    {
398
    case bfd_object:
399
      return "object";          /* Linker/assembler/compiler output.  */
400
    case bfd_archive:
401
      return "archive";         /* Object archive file.  */
402
    case bfd_core:
403
      return "core";            /* Core dump.  */
404
    default:
405
      return "unknown";
406
    }
407
}

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