Commit | Line | Data |
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252b5132 | 1 | /* Stabs in sections linking support. |
3d456464 | 2 | Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 |
dc810e39 | 3 | Free Software Foundation, Inc. |
252b5132 RH |
4 | Written by Ian Lance Taylor, Cygnus Support. |
5 | ||
955a76eb | 6 | This file is part of BFD, the Binary File Descriptor library. |
252b5132 | 7 | |
955a76eb NC |
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. | |
252b5132 | 12 | |
955a76eb NC |
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. | |
252b5132 | 17 | |
955a76eb NC |
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
252b5132 RH |
21 | |
22 | /* This file contains support for linking stabs in sections, as used | |
23 | on COFF and ELF. */ | |
24 | ||
25 | #include "bfd.h" | |
26 | #include "sysdep.h" | |
27 | #include "libbfd.h" | |
28 | #include "aout/stab_gnu.h" | |
3882b010 | 29 | #include "safe-ctype.h" |
252b5132 RH |
30 | |
31 | /* Stabs entries use a 12 byte format: | |
32 | 4 byte string table index | |
33 | 1 byte stab type | |
34 | 1 byte stab other field | |
35 | 2 byte stab desc field | |
36 | 4 byte stab value | |
37 | FIXME: This will have to change for a 64 bit object format. | |
38 | ||
39 | The stabs symbols are divided into compilation units. For the | |
40 | first entry in each unit, the type of 0, the value is the length of | |
41 | the string table for this unit, and the desc field is the number of | |
42 | stabs symbols for this unit. */ | |
43 | ||
44 | #define STRDXOFF (0) | |
45 | #define TYPEOFF (4) | |
46 | #define OTHEROFF (5) | |
47 | #define DESCOFF (6) | |
48 | #define VALOFF (8) | |
49 | #define STABSIZE (12) | |
50 | ||
252b5132 | 51 | /* A linked list of totals that we have found for a particular header |
66a695f0 NC |
52 | file. A total is a unique identifier for a particular BINCL...EINCL |
53 | sequence of STABs that can be used to identify duplicate sequences. | |
54 | It consists of three fields, 'sum_chars' which is the sum of all the | |
55 | STABS characters; 'num_chars' which is the number of these charactes | |
56 | and 'symb' which is a buffer of all the symbols in the sequence. This | |
57 | buffer is only checked as a last resort. */ | |
252b5132 RH |
58 | |
59 | struct stab_link_includes_totals | |
60 | { | |
61 | struct stab_link_includes_totals *next; | |
a56b48eb NC |
62 | bfd_vma sum_chars; /* Accumulated sum of STABS characters. */ |
63 | bfd_vma num_chars; /* Number of STABS characters. */ | |
66a695f0 | 64 | const char* symb; /* The STABS characters themselves. */ |
252b5132 RH |
65 | }; |
66 | ||
67 | /* An entry in the header file hash table. */ | |
68 | ||
69 | struct stab_link_includes_entry | |
70 | { | |
71 | struct bfd_hash_entry root; | |
72 | /* List of totals we have found for this file. */ | |
73 | struct stab_link_includes_totals *totals; | |
74 | }; | |
75 | ||
252b5132 RH |
76 | /* This structure is used to hold a list of N_BINCL symbols, some of |
77 | which might be converted into N_EXCL symbols. */ | |
78 | ||
79 | struct stab_excl_list | |
80 | { | |
81 | /* The next symbol to convert. */ | |
82 | struct stab_excl_list *next; | |
83 | /* The offset to this symbol in the section contents. */ | |
84 | bfd_size_type offset; | |
85 | /* The value to use for the symbol. */ | |
86 | bfd_vma val; | |
87 | /* The type of this symbol (N_BINCL or N_EXCL). */ | |
88 | int type; | |
89 | }; | |
90 | ||
91 | /* This structure is stored with each .stab section. */ | |
92 | ||
93 | struct stab_section_info | |
94 | { | |
95 | /* This is a linked list of N_BINCL symbols which should be | |
96 | converted into N_EXCL symbols. */ | |
97 | struct stab_excl_list *excls; | |
98 | ||
99 | /* This is used to map input stab offsets within their sections | |
100 | to output stab offsets, to take into account stabs that have | |
101 | been deleted. If it is NULL, the output offsets are the same | |
102 | as the input offsets, because no stabs have been deleted from | |
103 | this section. Otherwise the i'th entry is the number of | |
104 | bytes of stabs that have been deleted prior to the i'th | |
7b82c249 | 105 | stab. */ |
252b5132 RH |
106 | bfd_size_type *cumulative_skips; |
107 | ||
108 | /* This is an array of string indices. For each stab symbol, we | |
109 | store the string index here. If a stab symbol should not be | |
110 | included in the final output, the string index is -1. */ | |
111 | bfd_size_type stridxs[1]; | |
112 | }; | |
113 | ||
252b5132 RH |
114 | static struct bfd_hash_entry *stab_link_includes_newfunc |
115 | PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); | |
116 | \f | |
117 | /* The function to create a new entry in the header file hash table. */ | |
118 | ||
119 | static struct bfd_hash_entry * | |
120 | stab_link_includes_newfunc (entry, table, string) | |
121 | struct bfd_hash_entry *entry; | |
122 | struct bfd_hash_table *table; | |
123 | const char *string; | |
124 | { | |
125 | struct stab_link_includes_entry *ret = | |
126 | (struct stab_link_includes_entry *) entry; | |
127 | ||
128 | /* Allocate the structure if it has not already been allocated by a | |
129 | subclass. */ | |
130 | if (ret == (struct stab_link_includes_entry *) NULL) | |
131 | ret = ((struct stab_link_includes_entry *) | |
132 | bfd_hash_allocate (table, | |
133 | sizeof (struct stab_link_includes_entry))); | |
134 | if (ret == (struct stab_link_includes_entry *) NULL) | |
135 | return (struct bfd_hash_entry *) ret; | |
136 | ||
137 | /* Call the allocation method of the superclass. */ | |
138 | ret = ((struct stab_link_includes_entry *) | |
139 | bfd_hash_newfunc ((struct bfd_hash_entry *) ret, table, string)); | |
140 | if (ret) | |
141 | { | |
142 | /* Set local fields. */ | |
143 | ret->totals = NULL; | |
144 | } | |
145 | ||
146 | return (struct bfd_hash_entry *) ret; | |
147 | } | |
148 | \f | |
149 | /* This function is called for each input file from the add_symbols | |
150 | pass of the linker. */ | |
151 | ||
b34976b6 | 152 | bfd_boolean |
3722b82f | 153 | _bfd_link_section_stabs (abfd, sinfo, stabsec, stabstrsec, psecinfo, pstring_offset) |
252b5132 | 154 | bfd *abfd; |
3722b82f | 155 | struct stab_info *sinfo; |
252b5132 RH |
156 | asection *stabsec; |
157 | asection *stabstrsec; | |
158 | PTR *psecinfo; | |
29ca8dc5 | 159 | bfd_size_type *pstring_offset; |
252b5132 | 160 | { |
b34976b6 | 161 | bfd_boolean first; |
dc810e39 | 162 | bfd_size_type count, amt; |
252b5132 RH |
163 | struct stab_section_info *secinfo; |
164 | bfd_byte *stabbuf = NULL; | |
165 | bfd_byte *stabstrbuf = NULL; | |
166 | bfd_byte *sym, *symend; | |
167 | bfd_size_type stroff, next_stroff, skip; | |
168 | bfd_size_type *pstridx; | |
169 | ||
eea6121a AM |
170 | if (stabsec->size == 0 |
171 | || stabstrsec->size == 0) | |
252b5132 RH |
172 | { |
173 | /* This file does not contain stabs debugging information. */ | |
b34976b6 | 174 | return TRUE; |
252b5132 RH |
175 | } |
176 | ||
eea6121a | 177 | if (stabsec->size % STABSIZE != 0) |
252b5132 RH |
178 | { |
179 | /* Something is wrong with the format of these stab symbols. | |
b34976b6 AM |
180 | Don't try to optimize them. */ |
181 | return TRUE; | |
252b5132 RH |
182 | } |
183 | ||
184 | if ((stabstrsec->flags & SEC_RELOC) != 0) | |
185 | { | |
186 | /* We shouldn't see relocations in the strings, and we aren't | |
b34976b6 AM |
187 | prepared to handle them. */ |
188 | return TRUE; | |
252b5132 RH |
189 | } |
190 | ||
191 | if ((stabsec->output_section != NULL | |
192 | && bfd_is_abs_section (stabsec->output_section)) | |
193 | || (stabstrsec->output_section != NULL | |
194 | && bfd_is_abs_section (stabstrsec->output_section))) | |
195 | { | |
196 | /* At least one of the sections is being discarded from the | |
b34976b6 AM |
197 | link, so we should just ignore them. */ |
198 | return TRUE; | |
252b5132 RH |
199 | } |
200 | ||
b34976b6 | 201 | first = FALSE; |
252b5132 | 202 | |
3722b82f | 203 | if (sinfo->stabstr == NULL) |
252b5132 RH |
204 | { |
205 | /* Initialize the stabs information we need to keep track of. */ | |
b34976b6 | 206 | first = TRUE; |
252b5132 RH |
207 | sinfo->strings = _bfd_stringtab_init (); |
208 | if (sinfo->strings == NULL) | |
209 | goto error_return; | |
8140b664 | 210 | /* Make sure the first byte is zero. */ |
b34976b6 | 211 | (void) _bfd_stringtab_add (sinfo->strings, "", TRUE, TRUE); |
3722b82f | 212 | if (! bfd_hash_table_init_n (&sinfo->includes, |
252b5132 RH |
213 | stab_link_includes_newfunc, |
214 | 251)) | |
215 | goto error_return; | |
216 | sinfo->stabstr = bfd_make_section_anyway (abfd, ".stabstr"); | |
3722b82f AM |
217 | if (sinfo->stabstr == NULL) |
218 | goto error_return; | |
219 | sinfo->stabstr->flags |= (SEC_HAS_CONTENTS | SEC_READONLY | |
220 | | SEC_DEBUGGING | SEC_LINKER_CREATED); | |
252b5132 RH |
221 | } |
222 | ||
252b5132 RH |
223 | /* Initialize the information we are going to store for this .stab |
224 | section. */ | |
225 | ||
eea6121a | 226 | count = stabsec->size / STABSIZE; |
252b5132 | 227 | |
dc810e39 AM |
228 | amt = sizeof (struct stab_section_info); |
229 | amt += (count - 1) * sizeof (bfd_size_type); | |
230 | *psecinfo = bfd_alloc (abfd, amt); | |
252b5132 RH |
231 | if (*psecinfo == NULL) |
232 | goto error_return; | |
233 | ||
234 | secinfo = (struct stab_section_info *) *psecinfo; | |
235 | secinfo->excls = NULL; | |
eea6121a | 236 | stabsec->rawsize = stabsec->size; |
252b5132 | 237 | secinfo->cumulative_skips = NULL; |
dc810e39 | 238 | memset (secinfo->stridxs, 0, (size_t) count * sizeof (bfd_size_type)); |
252b5132 RH |
239 | |
240 | /* Read the stabs information from abfd. */ | |
241 | ||
eea6121a AM |
242 | if (!bfd_malloc_and_get_section (abfd, stabsec, &stabbuf) |
243 | || !bfd_malloc_and_get_section (abfd, stabstrsec, &stabstrbuf)) | |
252b5132 RH |
244 | goto error_return; |
245 | ||
246 | /* Look through the stabs symbols, work out the new string indices, | |
247 | and identify N_BINCL symbols which can be eliminated. */ | |
248 | ||
249 | stroff = 0; | |
29ca8dc5 NS |
250 | /* The stabs sections can be split when |
251 | -split-by-reloc/-split-by-file is used. We must keep track of | |
252 | each stab section's place in the single concatenated string | |
253 | table. */ | |
254 | next_stroff = pstring_offset ? *pstring_offset : 0; | |
252b5132 RH |
255 | skip = 0; |
256 | ||
eea6121a | 257 | symend = stabbuf + stabsec->size; |
252b5132 RH |
258 | for (sym = stabbuf, pstridx = secinfo->stridxs; |
259 | sym < symend; | |
260 | sym += STABSIZE, ++pstridx) | |
261 | { | |
644c4c80 | 262 | bfd_size_type symstroff; |
252b5132 RH |
263 | int type; |
264 | const char *string; | |
265 | ||
266 | if (*pstridx != 0) | |
267 | { | |
268 | /* This symbol has already been handled by an N_BINCL pass. */ | |
269 | continue; | |
270 | } | |
271 | ||
272 | type = sym[TYPEOFF]; | |
273 | ||
274 | if (type == 0) | |
275 | { | |
276 | /* Special type 0 stabs indicate the offset to the next | |
b34976b6 | 277 | string table. We only copy the very first one. */ |
252b5132 RH |
278 | stroff = next_stroff; |
279 | next_stroff += bfd_get_32 (abfd, sym + 8); | |
29ca8dc5 NS |
280 | if (pstring_offset) |
281 | *pstring_offset = next_stroff; | |
252b5132 RH |
282 | if (! first) |
283 | { | |
284 | *pstridx = (bfd_size_type) -1; | |
285 | ++skip; | |
286 | continue; | |
287 | } | |
b34976b6 | 288 | first = FALSE; |
252b5132 RH |
289 | } |
290 | ||
291 | /* Store the string in the hash table, and record the index. */ | |
644c4c80 | 292 | symstroff = stroff + bfd_get_32 (abfd, sym + STRDXOFF); |
eea6121a | 293 | if (symstroff >= stabstrsec->size) |
644c4c80 RS |
294 | { |
295 | (*_bfd_error_handler) | |
d003868e AM |
296 | (_("%B(%A+0x%lx): Stabs entry has invalid string index."), |
297 | abfd, stabsec, (long) (sym - stabbuf)); | |
644c4c80 RS |
298 | bfd_set_error (bfd_error_bad_value); |
299 | goto error_return; | |
300 | } | |
301 | string = (char *) stabstrbuf + symstroff; | |
b34976b6 | 302 | *pstridx = _bfd_stringtab_add (sinfo->strings, string, TRUE, TRUE); |
252b5132 RH |
303 | |
304 | /* An N_BINCL symbol indicates the start of the stabs entries | |
305 | for a header file. We need to scan ahead to the next N_EINCL | |
306 | symbol, ignoring nesting, adding up all the characters in the | |
307 | symbol names, not including the file numbers in types (the | |
308 | first number after an open parenthesis). */ | |
d45913a0 | 309 | if (type == (int) N_BINCL) |
252b5132 | 310 | { |
a56b48eb NC |
311 | bfd_vma sum_chars; |
312 | bfd_vma num_chars; | |
66a695f0 NC |
313 | bfd_vma buf_len = 0; |
314 | char * symb; | |
315 | char * symb_rover; | |
252b5132 | 316 | int nest; |
66a695f0 NC |
317 | bfd_byte * incl_sym; |
318 | struct stab_link_includes_entry * incl_entry; | |
319 | struct stab_link_includes_totals * t; | |
320 | struct stab_excl_list * ne; | |
252b5132 | 321 | |
66a695f0 | 322 | symb = symb_rover = NULL; |
a56b48eb | 323 | sum_chars = num_chars = 0; |
252b5132 | 324 | nest = 0; |
66a695f0 | 325 | |
252b5132 RH |
326 | for (incl_sym = sym + STABSIZE; |
327 | incl_sym < symend; | |
328 | incl_sym += STABSIZE) | |
329 | { | |
330 | int incl_type; | |
331 | ||
332 | incl_type = incl_sym[TYPEOFF]; | |
333 | if (incl_type == 0) | |
334 | break; | |
955a76eb NC |
335 | else if (incl_type == (int) N_EXCL) |
336 | continue; | |
d45913a0 | 337 | else if (incl_type == (int) N_EINCL) |
252b5132 RH |
338 | { |
339 | if (nest == 0) | |
340 | break; | |
341 | --nest; | |
342 | } | |
d45913a0 | 343 | else if (incl_type == (int) N_BINCL) |
252b5132 RH |
344 | ++nest; |
345 | else if (nest == 0) | |
346 | { | |
347 | const char *str; | |
348 | ||
349 | str = ((char *) stabstrbuf | |
350 | + stroff | |
351 | + bfd_get_32 (abfd, incl_sym + STRDXOFF)); | |
352 | for (; *str != '\0'; str++) | |
353 | { | |
66a695f0 NC |
354 | if (num_chars >= buf_len) |
355 | { | |
356 | buf_len += 32 * 1024; | |
357 | symb = bfd_realloc (symb, buf_len); | |
358 | if (symb == NULL) | |
359 | goto error_return; | |
360 | symb_rover = symb + num_chars; | |
361 | } | |
362 | * symb_rover ++ = * str; | |
a56b48eb NC |
363 | sum_chars += *str; |
364 | num_chars ++; | |
252b5132 RH |
365 | if (*str == '(') |
366 | { | |
367 | /* Skip the file number. */ | |
368 | ++str; | |
3882b010 | 369 | while (ISDIGIT (*str)) |
252b5132 RH |
370 | ++str; |
371 | --str; | |
372 | } | |
373 | } | |
374 | } | |
375 | } | |
376 | ||
66a695f0 NC |
377 | BFD_ASSERT (num_chars == (bfd_vma) (symb_rover - symb)); |
378 | ||
252b5132 RH |
379 | /* If we have already included a header file with the same |
380 | value, then replaced this one with an N_EXCL symbol. */ | |
3722b82f AM |
381 | incl_entry = (struct stab_link_includes_entry * ) |
382 | bfd_hash_lookup (&sinfo->includes, string, TRUE, TRUE); | |
252b5132 RH |
383 | if (incl_entry == NULL) |
384 | goto error_return; | |
385 | ||
386 | for (t = incl_entry->totals; t != NULL; t = t->next) | |
66a695f0 NC |
387 | if (t->sum_chars == sum_chars |
388 | && t->num_chars == num_chars | |
389 | && memcmp (t->symb, symb, num_chars) == 0) | |
252b5132 RH |
390 | break; |
391 | ||
392 | /* Record this symbol, so that we can set the value | |
b34976b6 | 393 | correctly. */ |
dc810e39 AM |
394 | amt = sizeof *ne; |
395 | ne = (struct stab_excl_list *) bfd_alloc (abfd, amt); | |
252b5132 RH |
396 | if (ne == NULL) |
397 | goto error_return; | |
398 | ne->offset = sym - stabbuf; | |
a56b48eb | 399 | ne->val = sum_chars; |
d45913a0 | 400 | ne->type = (int) N_BINCL; |
252b5132 RH |
401 | ne->next = secinfo->excls; |
402 | secinfo->excls = ne; | |
403 | ||
404 | if (t == NULL) | |
405 | { | |
406 | /* This is the first time we have seen this header file | |
407 | with this set of stabs strings. */ | |
408 | t = ((struct stab_link_includes_totals *) | |
3722b82f | 409 | bfd_hash_allocate (&sinfo->includes, sizeof *t)); |
252b5132 RH |
410 | if (t == NULL) |
411 | goto error_return; | |
a56b48eb NC |
412 | t->sum_chars = sum_chars; |
413 | t->num_chars = num_chars; | |
66a695f0 | 414 | t->symb = bfd_realloc (symb, num_chars); /* Trim data down. */ |
252b5132 RH |
415 | t->next = incl_entry->totals; |
416 | incl_entry->totals = t; | |
417 | } | |
418 | else | |
419 | { | |
420 | bfd_size_type *incl_pstridx; | |
421 | ||
422 | /* We have seen this header file before. Tell the final | |
423 | pass to change the type to N_EXCL. */ | |
d45913a0 | 424 | ne->type = (int) N_EXCL; |
252b5132 | 425 | |
66a695f0 NC |
426 | /* Free off superfluous symbols. */ |
427 | free (symb); | |
428 | ||
252b5132 RH |
429 | /* Mark the skipped symbols. */ |
430 | ||
431 | nest = 0; | |
432 | for (incl_sym = sym + STABSIZE, incl_pstridx = pstridx + 1; | |
433 | incl_sym < symend; | |
434 | incl_sym += STABSIZE, ++incl_pstridx) | |
435 | { | |
436 | int incl_type; | |
437 | ||
438 | incl_type = incl_sym[TYPEOFF]; | |
439 | ||
d45913a0 | 440 | if (incl_type == (int) N_EINCL) |
252b5132 RH |
441 | { |
442 | if (nest == 0) | |
443 | { | |
444 | *incl_pstridx = (bfd_size_type) -1; | |
445 | ++skip; | |
446 | break; | |
447 | } | |
448 | --nest; | |
449 | } | |
d45913a0 | 450 | else if (incl_type == (int) N_BINCL) |
252b5132 | 451 | ++nest; |
3d456464 NC |
452 | else if (incl_type == (int) N_EXCL) |
453 | /* Keep existing exclusion marks. */ | |
454 | continue; | |
252b5132 RH |
455 | else if (nest == 0) |
456 | { | |
457 | *incl_pstridx = (bfd_size_type) -1; | |
458 | ++skip; | |
459 | } | |
460 | } | |
461 | } | |
462 | } | |
463 | } | |
464 | ||
465 | free (stabbuf); | |
466 | stabbuf = NULL; | |
467 | free (stabstrbuf); | |
468 | stabstrbuf = NULL; | |
469 | ||
470 | /* We need to set the section sizes such that the linker will | |
471 | compute the output section sizes correctly. We set the .stab | |
472 | size to not include the entries we don't want. We set | |
473 | SEC_EXCLUDE for the .stabstr section, so that it will be dropped | |
474 | from the link. We record the size of the strtab in the first | |
475 | .stabstr section we saw, and make sure we don't set SEC_EXCLUDE | |
476 | for that section. */ | |
eea6121a AM |
477 | stabsec->size = (count - skip) * STABSIZE; |
478 | if (stabsec->size == 0) | |
252b5132 RH |
479 | stabsec->flags |= SEC_EXCLUDE; |
480 | stabstrsec->flags |= SEC_EXCLUDE; | |
eea6121a | 481 | sinfo->stabstr->size = _bfd_stringtab_size (sinfo->strings); |
252b5132 RH |
482 | |
483 | /* Calculate the `cumulative_skips' array now that stabs have been | |
7b82c249 | 484 | deleted for this section. */ |
252b5132 RH |
485 | |
486 | if (skip != 0) | |
487 | { | |
488 | bfd_size_type i, offset; | |
489 | bfd_size_type *pskips; | |
490 | ||
dc810e39 AM |
491 | amt = count * sizeof (bfd_size_type); |
492 | secinfo->cumulative_skips = (bfd_size_type *) bfd_alloc (abfd, amt); | |
252b5132 RH |
493 | if (secinfo->cumulative_skips == NULL) |
494 | goto error_return; | |
495 | ||
496 | pskips = secinfo->cumulative_skips; | |
497 | pstridx = secinfo->stridxs; | |
498 | offset = 0; | |
499 | ||
500 | for (i = 0; i < count; i++, pskips++, pstridx++) | |
501 | { | |
502 | *pskips = offset; | |
503 | if (*pstridx == (bfd_size_type) -1) | |
504 | offset += STABSIZE; | |
505 | } | |
506 | ||
507 | BFD_ASSERT (offset != 0); | |
508 | } | |
509 | ||
b34976b6 | 510 | return TRUE; |
252b5132 RH |
511 | |
512 | error_return: | |
513 | if (stabbuf != NULL) | |
514 | free (stabbuf); | |
515 | if (stabstrbuf != NULL) | |
516 | free (stabstrbuf); | |
b34976b6 | 517 | return FALSE; |
252b5132 | 518 | } |
73d074b4 DJ |
519 | \f |
520 | /* This function is called for each input file before the stab | |
521 | section is relocated. It discards stab entries for discarded | |
b34976b6 | 522 | functions and variables. The function returns TRUE iff |
73d074b4 DJ |
523 | any entries have been deleted. |
524 | */ | |
525 | ||
b34976b6 | 526 | bfd_boolean |
73d074b4 DJ |
527 | _bfd_discard_section_stabs (abfd, stabsec, psecinfo, |
528 | reloc_symbol_deleted_p, cookie) | |
529 | bfd *abfd; | |
530 | asection *stabsec; | |
531 | PTR psecinfo; | |
b34976b6 | 532 | bfd_boolean (*reloc_symbol_deleted_p) PARAMS ((bfd_vma, PTR)); |
73d074b4 DJ |
533 | PTR cookie; |
534 | { | |
535 | bfd_size_type count, amt; | |
536 | struct stab_section_info *secinfo; | |
537 | bfd_byte *stabbuf = NULL; | |
538 | bfd_byte *sym, *symend; | |
539 | bfd_size_type skip; | |
540 | bfd_size_type *pstridx; | |
541 | int deleting; | |
542 | ||
eea6121a | 543 | if (stabsec->size == 0) |
73d074b4 DJ |
544 | { |
545 | /* This file does not contain stabs debugging information. */ | |
b34976b6 | 546 | return FALSE; |
73d074b4 DJ |
547 | } |
548 | ||
eea6121a | 549 | if (stabsec->size % STABSIZE != 0) |
73d074b4 DJ |
550 | { |
551 | /* Something is wrong with the format of these stab symbols. | |
b34976b6 AM |
552 | Don't try to optimize them. */ |
553 | return FALSE; | |
73d074b4 DJ |
554 | } |
555 | ||
556 | if ((stabsec->output_section != NULL | |
557 | && bfd_is_abs_section (stabsec->output_section))) | |
558 | { | |
559 | /* At least one of the sections is being discarded from the | |
b34976b6 AM |
560 | link, so we should just ignore them. */ |
561 | return FALSE; | |
73d074b4 DJ |
562 | } |
563 | ||
564 | /* We should have initialized our data in _bfd_link_stab_sections. | |
565 | If there was some bizarre error reading the string sections, though, | |
566 | we might not have. Bail rather than asserting. */ | |
567 | if (psecinfo == NULL) | |
b34976b6 | 568 | return FALSE; |
73d074b4 | 569 | |
eea6121a | 570 | count = stabsec->rawsize / STABSIZE; |
73d074b4 DJ |
571 | secinfo = (struct stab_section_info *) psecinfo; |
572 | ||
573 | /* Read the stabs information from abfd. */ | |
574 | ||
eea6121a | 575 | if (!bfd_malloc_and_get_section (abfd, stabsec, &stabbuf)) |
73d074b4 DJ |
576 | goto error_return; |
577 | ||
578 | /* Look through the stabs symbols and discard any information for | |
579 | discarded functions. */ | |
580 | ||
581 | skip = 0; | |
582 | deleting = -1; | |
583 | ||
eea6121a | 584 | symend = stabbuf + stabsec->rawsize; |
73d074b4 DJ |
585 | for (sym = stabbuf, pstridx = secinfo->stridxs; |
586 | sym < symend; | |
587 | sym += STABSIZE, ++pstridx) | |
588 | { | |
589 | int type; | |
590 | ||
591 | if (*pstridx == (bfd_size_type) -1) | |
592 | { | |
593 | /* This stab was deleted in a previous pass. */ | |
594 | continue; | |
595 | } | |
596 | ||
597 | type = sym[TYPEOFF]; | |
598 | ||
d45913a0 | 599 | if (type == (int) N_FUN) |
73d074b4 DJ |
600 | { |
601 | int strx = bfd_get_32 (abfd, sym + STRDXOFF); | |
602 | ||
603 | if (strx == 0) | |
604 | { | |
605 | if (deleting) | |
606 | { | |
607 | skip++; | |
608 | *pstridx = -1; | |
609 | } | |
610 | deleting = -1; | |
611 | continue; | |
612 | } | |
613 | deleting = 0; | |
614 | if ((*reloc_symbol_deleted_p) (sym + VALOFF - stabbuf, cookie)) | |
615 | deleting = 1; | |
616 | } | |
617 | ||
618 | if (deleting == 1) | |
619 | { | |
620 | *pstridx = -1; | |
621 | skip++; | |
622 | } | |
623 | else if (deleting == -1) | |
624 | { | |
625 | /* Outside of a function. Check for deleted variables. */ | |
d45913a0 | 626 | if (type == (int) N_STSYM || type == (int) N_LCSYM) |
73d074b4 DJ |
627 | if ((*reloc_symbol_deleted_p) (sym + VALOFF - stabbuf, cookie)) |
628 | { | |
629 | *pstridx = -1; | |
630 | skip ++; | |
631 | } | |
632 | /* We should also check for N_GSYM entries which reference a | |
633 | deleted global, but those are less harmful to debuggers | |
634 | and would require parsing the stab strings. */ | |
635 | } | |
636 | } | |
637 | ||
638 | free (stabbuf); | |
639 | stabbuf = NULL; | |
640 | ||
641 | /* Shrink the stabsec as needed. */ | |
eea6121a AM |
642 | stabsec->size -= skip * STABSIZE; |
643 | if (stabsec->size == 0) | |
73d074b4 DJ |
644 | stabsec->flags |= SEC_EXCLUDE; |
645 | ||
646 | /* Recalculate the `cumulative_skips' array now that stabs have been | |
647 | deleted for this section. */ | |
648 | ||
649 | if (skip != 0) | |
650 | { | |
651 | bfd_size_type i, offset; | |
652 | bfd_size_type *pskips; | |
653 | ||
654 | if (secinfo->cumulative_skips == NULL) | |
655 | { | |
656 | amt = count * sizeof (bfd_size_type); | |
657 | secinfo->cumulative_skips = (bfd_size_type *) bfd_alloc (abfd, amt); | |
658 | if (secinfo->cumulative_skips == NULL) | |
659 | goto error_return; | |
660 | } | |
661 | ||
662 | pskips = secinfo->cumulative_skips; | |
663 | pstridx = secinfo->stridxs; | |
664 | offset = 0; | |
665 | ||
666 | for (i = 0; i < count; i++, pskips++, pstridx++) | |
667 | { | |
668 | *pskips = offset; | |
669 | if (*pstridx == (bfd_size_type) -1) | |
670 | offset += STABSIZE; | |
671 | } | |
672 | ||
673 | BFD_ASSERT (offset != 0); | |
674 | } | |
675 | ||
b34976b6 | 676 | return skip > 0; |
73d074b4 DJ |
677 | |
678 | error_return: | |
679 | if (stabbuf != NULL) | |
680 | free (stabbuf); | |
b34976b6 | 681 | return FALSE; |
73d074b4 DJ |
682 | } |
683 | ||
252b5132 RH |
684 | /* Write out the stab section. This is called with the relocated |
685 | contents. */ | |
686 | ||
b34976b6 | 687 | bfd_boolean |
3722b82f | 688 | _bfd_write_section_stabs (output_bfd, sinfo, stabsec, psecinfo, contents) |
252b5132 | 689 | bfd *output_bfd; |
3722b82f | 690 | struct stab_info *sinfo; |
252b5132 RH |
691 | asection *stabsec; |
692 | PTR *psecinfo; | |
693 | bfd_byte *contents; | |
694 | { | |
252b5132 RH |
695 | struct stab_section_info *secinfo; |
696 | struct stab_excl_list *e; | |
697 | bfd_byte *sym, *tosym, *symend; | |
698 | bfd_size_type *pstridx; | |
699 | ||
252b5132 RH |
700 | secinfo = (struct stab_section_info *) *psecinfo; |
701 | ||
702 | if (secinfo == NULL) | |
703 | return bfd_set_section_contents (output_bfd, stabsec->output_section, | |
eea6121a AM |
704 | contents, stabsec->output_offset, |
705 | stabsec->size); | |
252b5132 RH |
706 | |
707 | /* Handle each N_BINCL entry. */ | |
708 | for (e = secinfo->excls; e != NULL; e = e->next) | |
709 | { | |
710 | bfd_byte *excl_sym; | |
711 | ||
eea6121a | 712 | BFD_ASSERT (e->offset < stabsec->rawsize); |
252b5132 RH |
713 | excl_sym = contents + e->offset; |
714 | bfd_put_32 (output_bfd, e->val, excl_sym + VALOFF); | |
715 | excl_sym[TYPEOFF] = e->type; | |
716 | } | |
717 | ||
718 | /* Copy over all the stabs symbols, omitting the ones we don't want, | |
719 | and correcting the string indices for those we do want. */ | |
720 | tosym = contents; | |
eea6121a | 721 | symend = contents + stabsec->rawsize; |
252b5132 RH |
722 | for (sym = contents, pstridx = secinfo->stridxs; |
723 | sym < symend; | |
724 | sym += STABSIZE, ++pstridx) | |
725 | { | |
726 | if (*pstridx != (bfd_size_type) -1) | |
727 | { | |
728 | if (tosym != sym) | |
729 | memcpy (tosym, sym, STABSIZE); | |
730 | bfd_put_32 (output_bfd, *pstridx, tosym + STRDXOFF); | |
731 | ||
732 | if (sym[TYPEOFF] == 0) | |
733 | { | |
734 | /* This is the header symbol for the stabs section. We | |
b34976b6 AM |
735 | don't really need one, since we have merged all the |
736 | input stabs sections into one, but we generate one | |
737 | for the benefit of readers which expect to see one. */ | |
252b5132 RH |
738 | BFD_ASSERT (sym == contents); |
739 | bfd_put_32 (output_bfd, _bfd_stringtab_size (sinfo->strings), | |
740 | tosym + VALOFF); | |
741 | bfd_put_16 (output_bfd, | |
eea6121a | 742 | stabsec->output_section->size / STABSIZE - 1, |
252b5132 RH |
743 | tosym + DESCOFF); |
744 | } | |
745 | ||
746 | tosym += STABSIZE; | |
747 | } | |
748 | } | |
749 | ||
eea6121a | 750 | BFD_ASSERT ((bfd_size_type) (tosym - contents) == stabsec->size); |
252b5132 RH |
751 | |
752 | return bfd_set_section_contents (output_bfd, stabsec->output_section, | |
dc810e39 | 753 | contents, (file_ptr) stabsec->output_offset, |
eea6121a | 754 | stabsec->size); |
252b5132 RH |
755 | } |
756 | ||
757 | /* Write out the .stabstr section. */ | |
758 | ||
b34976b6 | 759 | bfd_boolean |
3722b82f | 760 | _bfd_write_stab_strings (output_bfd, sinfo) |
252b5132 | 761 | bfd *output_bfd; |
3722b82f | 762 | struct stab_info *sinfo; |
252b5132 | 763 | { |
252b5132 RH |
764 | if (bfd_is_abs_section (sinfo->stabstr->output_section)) |
765 | { | |
766 | /* The section was discarded from the link. */ | |
b34976b6 | 767 | return TRUE; |
252b5132 RH |
768 | } |
769 | ||
770 | BFD_ASSERT ((sinfo->stabstr->output_offset | |
771 | + _bfd_stringtab_size (sinfo->strings)) | |
eea6121a | 772 | <= sinfo->stabstr->output_section->size); |
252b5132 RH |
773 | |
774 | if (bfd_seek (output_bfd, | |
dc810e39 AM |
775 | (file_ptr) (sinfo->stabstr->output_section->filepos |
776 | + sinfo->stabstr->output_offset), | |
252b5132 | 777 | SEEK_SET) != 0) |
b34976b6 | 778 | return FALSE; |
252b5132 RH |
779 | |
780 | if (! _bfd_stringtab_emit (output_bfd, sinfo->strings)) | |
b34976b6 | 781 | return FALSE; |
252b5132 RH |
782 | |
783 | /* We no longer need the stabs information. */ | |
784 | _bfd_stringtab_free (sinfo->strings); | |
3722b82f | 785 | bfd_hash_table_free (&sinfo->includes); |
252b5132 | 786 | |
b34976b6 | 787 | return TRUE; |
252b5132 RH |
788 | } |
789 | ||
790 | /* Adjust an address in the .stab section. Given OFFSET within | |
791 | STABSEC, this returns the new offset in the adjusted stab section, | |
792 | or -1 if the address refers to a stab which has been removed. */ | |
793 | ||
794 | bfd_vma | |
eea6121a | 795 | _bfd_stab_section_offset (stabsec, psecinfo, offset) |
252b5132 | 796 | asection *stabsec; |
eea6121a | 797 | PTR psecinfo; |
252b5132 RH |
798 | bfd_vma offset; |
799 | { | |
800 | struct stab_section_info *secinfo; | |
801 | ||
eea6121a | 802 | secinfo = (struct stab_section_info *) psecinfo; |
252b5132 RH |
803 | |
804 | if (secinfo == NULL) | |
805 | return offset; | |
806 | ||
eea6121a AM |
807 | if (offset >= stabsec->rawsize) |
808 | return offset - stabsec->rawsize + stabsec->size; | |
252b5132 RH |
809 | |
810 | if (secinfo->cumulative_skips) | |
811 | { | |
812 | bfd_vma i; | |
813 | ||
814 | i = offset / STABSIZE; | |
815 | ||
816 | if (secinfo->stridxs [i] == (bfd_size_type) -1) | |
817 | return (bfd_vma) -1; | |
818 | ||
819 | return offset - secinfo->cumulative_skips [i]; | |
820 | } | |
821 | ||
822 | return offset; | |
823 | } |