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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 | ||
51 | /* A hash table used for header files with N_BINCL entries. */ | |
52 | ||
53 | struct stab_link_includes_table | |
54 | { | |
55 | struct bfd_hash_table root; | |
56 | }; | |
57 | ||
58 | /* A linked list of totals that we have found for a particular header | |
66a695f0 NC |
59 | file. A total is a unique identifier for a particular BINCL...EINCL |
60 | sequence of STABs that can be used to identify duplicate sequences. | |
61 | It consists of three fields, 'sum_chars' which is the sum of all the | |
62 | STABS characters; 'num_chars' which is the number of these charactes | |
63 | and 'symb' which is a buffer of all the symbols in the sequence. This | |
64 | buffer is only checked as a last resort. */ | |
252b5132 RH |
65 | |
66 | struct stab_link_includes_totals | |
67 | { | |
68 | struct stab_link_includes_totals *next; | |
a56b48eb NC |
69 | bfd_vma sum_chars; /* Accumulated sum of STABS characters. */ |
70 | bfd_vma num_chars; /* Number of STABS characters. */ | |
66a695f0 | 71 | const char* symb; /* The STABS characters themselves. */ |
252b5132 RH |
72 | }; |
73 | ||
74 | /* An entry in the header file hash table. */ | |
75 | ||
76 | struct stab_link_includes_entry | |
77 | { | |
78 | struct bfd_hash_entry root; | |
79 | /* List of totals we have found for this file. */ | |
80 | struct stab_link_includes_totals *totals; | |
81 | }; | |
82 | ||
83 | /* Look up an entry in an the header file hash table. */ | |
84 | ||
85 | #define stab_link_includes_lookup(table, string, create, copy) \ | |
86 | ((struct stab_link_includes_entry *) \ | |
87 | bfd_hash_lookup (&(table)->root, (string), (create), (copy))) | |
88 | ||
89 | /* This structure is used to hold a list of N_BINCL symbols, some of | |
90 | which might be converted into N_EXCL symbols. */ | |
91 | ||
92 | struct stab_excl_list | |
93 | { | |
94 | /* The next symbol to convert. */ | |
95 | struct stab_excl_list *next; | |
96 | /* The offset to this symbol in the section contents. */ | |
97 | bfd_size_type offset; | |
98 | /* The value to use for the symbol. */ | |
99 | bfd_vma val; | |
100 | /* The type of this symbol (N_BINCL or N_EXCL). */ | |
101 | int type; | |
102 | }; | |
103 | ||
104 | /* This structure is stored with each .stab section. */ | |
105 | ||
106 | struct stab_section_info | |
107 | { | |
108 | /* This is a linked list of N_BINCL symbols which should be | |
109 | converted into N_EXCL symbols. */ | |
110 | struct stab_excl_list *excls; | |
111 | ||
112 | /* This is used to map input stab offsets within their sections | |
113 | to output stab offsets, to take into account stabs that have | |
114 | been deleted. If it is NULL, the output offsets are the same | |
115 | as the input offsets, because no stabs have been deleted from | |
116 | this section. Otherwise the i'th entry is the number of | |
117 | bytes of stabs that have been deleted prior to the i'th | |
7b82c249 | 118 | stab. */ |
252b5132 RH |
119 | bfd_size_type *cumulative_skips; |
120 | ||
121 | /* This is an array of string indices. For each stab symbol, we | |
122 | store the string index here. If a stab symbol should not be | |
123 | included in the final output, the string index is -1. */ | |
124 | bfd_size_type stridxs[1]; | |
125 | }; | |
126 | ||
127 | /* This structure is used to keep track of stabs in sections | |
128 | information while linking. */ | |
129 | ||
130 | struct stab_info | |
131 | { | |
132 | /* A hash table used to hold stabs strings. */ | |
133 | struct bfd_strtab_hash *strings; | |
134 | /* The header file hash table. */ | |
135 | struct stab_link_includes_table includes; | |
136 | /* The first .stabstr section. */ | |
137 | asection *stabstr; | |
138 | }; | |
139 | ||
140 | static struct bfd_hash_entry *stab_link_includes_newfunc | |
141 | PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); | |
142 | \f | |
143 | /* The function to create a new entry in the header file hash table. */ | |
144 | ||
145 | static struct bfd_hash_entry * | |
146 | stab_link_includes_newfunc (entry, table, string) | |
147 | struct bfd_hash_entry *entry; | |
148 | struct bfd_hash_table *table; | |
149 | const char *string; | |
150 | { | |
151 | struct stab_link_includes_entry *ret = | |
152 | (struct stab_link_includes_entry *) entry; | |
153 | ||
154 | /* Allocate the structure if it has not already been allocated by a | |
155 | subclass. */ | |
156 | if (ret == (struct stab_link_includes_entry *) NULL) | |
157 | ret = ((struct stab_link_includes_entry *) | |
158 | bfd_hash_allocate (table, | |
159 | sizeof (struct stab_link_includes_entry))); | |
160 | if (ret == (struct stab_link_includes_entry *) NULL) | |
161 | return (struct bfd_hash_entry *) ret; | |
162 | ||
163 | /* Call the allocation method of the superclass. */ | |
164 | ret = ((struct stab_link_includes_entry *) | |
165 | bfd_hash_newfunc ((struct bfd_hash_entry *) ret, table, string)); | |
166 | if (ret) | |
167 | { | |
168 | /* Set local fields. */ | |
169 | ret->totals = NULL; | |
170 | } | |
171 | ||
172 | return (struct bfd_hash_entry *) ret; | |
173 | } | |
174 | \f | |
175 | /* This function is called for each input file from the add_symbols | |
176 | pass of the linker. */ | |
177 | ||
b34976b6 | 178 | bfd_boolean |
29ca8dc5 | 179 | _bfd_link_section_stabs (abfd, psinfo, stabsec, stabstrsec, psecinfo, pstring_offset) |
252b5132 RH |
180 | bfd *abfd; |
181 | PTR *psinfo; | |
182 | asection *stabsec; | |
183 | asection *stabstrsec; | |
184 | PTR *psecinfo; | |
29ca8dc5 | 185 | bfd_size_type *pstring_offset; |
252b5132 | 186 | { |
b34976b6 | 187 | bfd_boolean first; |
252b5132 | 188 | struct stab_info *sinfo; |
dc810e39 | 189 | bfd_size_type count, amt; |
252b5132 RH |
190 | struct stab_section_info *secinfo; |
191 | bfd_byte *stabbuf = NULL; | |
192 | bfd_byte *stabstrbuf = NULL; | |
193 | bfd_byte *sym, *symend; | |
194 | bfd_size_type stroff, next_stroff, skip; | |
195 | bfd_size_type *pstridx; | |
196 | ||
eea6121a AM |
197 | if (stabsec->size == 0 |
198 | || stabstrsec->size == 0) | |
252b5132 RH |
199 | { |
200 | /* This file does not contain stabs debugging information. */ | |
b34976b6 | 201 | return TRUE; |
252b5132 RH |
202 | } |
203 | ||
eea6121a | 204 | if (stabsec->size % STABSIZE != 0) |
252b5132 RH |
205 | { |
206 | /* Something is wrong with the format of these stab symbols. | |
b34976b6 AM |
207 | Don't try to optimize them. */ |
208 | return TRUE; | |
252b5132 RH |
209 | } |
210 | ||
211 | if ((stabstrsec->flags & SEC_RELOC) != 0) | |
212 | { | |
213 | /* We shouldn't see relocations in the strings, and we aren't | |
b34976b6 AM |
214 | prepared to handle them. */ |
215 | return TRUE; | |
252b5132 RH |
216 | } |
217 | ||
218 | if ((stabsec->output_section != NULL | |
219 | && bfd_is_abs_section (stabsec->output_section)) | |
220 | || (stabstrsec->output_section != NULL | |
221 | && bfd_is_abs_section (stabstrsec->output_section))) | |
222 | { | |
223 | /* At least one of the sections is being discarded from the | |
b34976b6 AM |
224 | link, so we should just ignore them. */ |
225 | return TRUE; | |
252b5132 RH |
226 | } |
227 | ||
b34976b6 | 228 | first = FALSE; |
252b5132 RH |
229 | |
230 | if (*psinfo == NULL) | |
231 | { | |
232 | /* Initialize the stabs information we need to keep track of. */ | |
b34976b6 | 233 | first = TRUE; |
dc810e39 AM |
234 | amt = sizeof (struct stab_info); |
235 | *psinfo = (PTR) bfd_alloc (abfd, amt); | |
252b5132 RH |
236 | if (*psinfo == NULL) |
237 | goto error_return; | |
238 | sinfo = (struct stab_info *) *psinfo; | |
239 | sinfo->strings = _bfd_stringtab_init (); | |
240 | if (sinfo->strings == NULL) | |
241 | goto error_return; | |
8140b664 | 242 | /* Make sure the first byte is zero. */ |
b34976b6 | 243 | (void) _bfd_stringtab_add (sinfo->strings, "", TRUE, TRUE); |
252b5132 RH |
244 | if (! bfd_hash_table_init_n (&sinfo->includes.root, |
245 | stab_link_includes_newfunc, | |
246 | 251)) | |
247 | goto error_return; | |
248 | sinfo->stabstr = bfd_make_section_anyway (abfd, ".stabstr"); | |
249 | sinfo->stabstr->flags |= SEC_HAS_CONTENTS | SEC_READONLY | SEC_DEBUGGING; | |
250 | } | |
251 | ||
252 | sinfo = (struct stab_info *) *psinfo; | |
253 | ||
254 | /* Initialize the information we are going to store for this .stab | |
255 | section. */ | |
256 | ||
eea6121a | 257 | count = stabsec->size / STABSIZE; |
252b5132 | 258 | |
dc810e39 AM |
259 | amt = sizeof (struct stab_section_info); |
260 | amt += (count - 1) * sizeof (bfd_size_type); | |
261 | *psecinfo = bfd_alloc (abfd, amt); | |
252b5132 RH |
262 | if (*psecinfo == NULL) |
263 | goto error_return; | |
264 | ||
265 | secinfo = (struct stab_section_info *) *psecinfo; | |
266 | secinfo->excls = NULL; | |
eea6121a | 267 | stabsec->rawsize = stabsec->size; |
252b5132 | 268 | secinfo->cumulative_skips = NULL; |
dc810e39 | 269 | memset (secinfo->stridxs, 0, (size_t) count * sizeof (bfd_size_type)); |
252b5132 RH |
270 | |
271 | /* Read the stabs information from abfd. */ | |
272 | ||
eea6121a AM |
273 | if (!bfd_malloc_and_get_section (abfd, stabsec, &stabbuf) |
274 | || !bfd_malloc_and_get_section (abfd, stabstrsec, &stabstrbuf)) | |
252b5132 RH |
275 | goto error_return; |
276 | ||
277 | /* Look through the stabs symbols, work out the new string indices, | |
278 | and identify N_BINCL symbols which can be eliminated. */ | |
279 | ||
280 | stroff = 0; | |
29ca8dc5 NS |
281 | /* The stabs sections can be split when |
282 | -split-by-reloc/-split-by-file is used. We must keep track of | |
283 | each stab section's place in the single concatenated string | |
284 | table. */ | |
285 | next_stroff = pstring_offset ? *pstring_offset : 0; | |
252b5132 RH |
286 | skip = 0; |
287 | ||
eea6121a | 288 | symend = stabbuf + stabsec->size; |
252b5132 RH |
289 | for (sym = stabbuf, pstridx = secinfo->stridxs; |
290 | sym < symend; | |
291 | sym += STABSIZE, ++pstridx) | |
292 | { | |
644c4c80 | 293 | bfd_size_type symstroff; |
252b5132 RH |
294 | int type; |
295 | const char *string; | |
296 | ||
297 | if (*pstridx != 0) | |
298 | { | |
299 | /* This symbol has already been handled by an N_BINCL pass. */ | |
300 | continue; | |
301 | } | |
302 | ||
303 | type = sym[TYPEOFF]; | |
304 | ||
305 | if (type == 0) | |
306 | { | |
307 | /* Special type 0 stabs indicate the offset to the next | |
b34976b6 | 308 | string table. We only copy the very first one. */ |
252b5132 RH |
309 | stroff = next_stroff; |
310 | next_stroff += bfd_get_32 (abfd, sym + 8); | |
29ca8dc5 NS |
311 | if (pstring_offset) |
312 | *pstring_offset = next_stroff; | |
252b5132 RH |
313 | if (! first) |
314 | { | |
315 | *pstridx = (bfd_size_type) -1; | |
316 | ++skip; | |
317 | continue; | |
318 | } | |
b34976b6 | 319 | first = FALSE; |
252b5132 RH |
320 | } |
321 | ||
322 | /* Store the string in the hash table, and record the index. */ | |
644c4c80 | 323 | symstroff = stroff + bfd_get_32 (abfd, sym + STRDXOFF); |
eea6121a | 324 | if (symstroff >= stabstrsec->size) |
644c4c80 RS |
325 | { |
326 | (*_bfd_error_handler) | |
327 | (_("%s(%s+0x%lx): Stabs entry has invalid string index."), | |
328 | bfd_archive_filename (abfd), | |
329 | bfd_get_section_name (abfd, stabsec), | |
330 | (long) (sym - stabbuf)); | |
331 | bfd_set_error (bfd_error_bad_value); | |
332 | goto error_return; | |
333 | } | |
334 | string = (char *) stabstrbuf + symstroff; | |
b34976b6 | 335 | *pstridx = _bfd_stringtab_add (sinfo->strings, string, TRUE, TRUE); |
252b5132 RH |
336 | |
337 | /* An N_BINCL symbol indicates the start of the stabs entries | |
338 | for a header file. We need to scan ahead to the next N_EINCL | |
339 | symbol, ignoring nesting, adding up all the characters in the | |
340 | symbol names, not including the file numbers in types (the | |
341 | first number after an open parenthesis). */ | |
d45913a0 | 342 | if (type == (int) N_BINCL) |
252b5132 | 343 | { |
a56b48eb NC |
344 | bfd_vma sum_chars; |
345 | bfd_vma num_chars; | |
66a695f0 NC |
346 | bfd_vma buf_len = 0; |
347 | char * symb; | |
348 | char * symb_rover; | |
252b5132 | 349 | int nest; |
66a695f0 NC |
350 | bfd_byte * incl_sym; |
351 | struct stab_link_includes_entry * incl_entry; | |
352 | struct stab_link_includes_totals * t; | |
353 | struct stab_excl_list * ne; | |
252b5132 | 354 | |
66a695f0 | 355 | symb = symb_rover = NULL; |
a56b48eb | 356 | sum_chars = num_chars = 0; |
252b5132 | 357 | nest = 0; |
66a695f0 | 358 | |
252b5132 RH |
359 | for (incl_sym = sym + STABSIZE; |
360 | incl_sym < symend; | |
361 | incl_sym += STABSIZE) | |
362 | { | |
363 | int incl_type; | |
364 | ||
365 | incl_type = incl_sym[TYPEOFF]; | |
366 | if (incl_type == 0) | |
367 | break; | |
955a76eb NC |
368 | else if (incl_type == (int) N_EXCL) |
369 | continue; | |
d45913a0 | 370 | else if (incl_type == (int) N_EINCL) |
252b5132 RH |
371 | { |
372 | if (nest == 0) | |
373 | break; | |
374 | --nest; | |
375 | } | |
d45913a0 | 376 | else if (incl_type == (int) N_BINCL) |
252b5132 RH |
377 | ++nest; |
378 | else if (nest == 0) | |
379 | { | |
380 | const char *str; | |
381 | ||
382 | str = ((char *) stabstrbuf | |
383 | + stroff | |
384 | + bfd_get_32 (abfd, incl_sym + STRDXOFF)); | |
385 | for (; *str != '\0'; str++) | |
386 | { | |
66a695f0 NC |
387 | if (num_chars >= buf_len) |
388 | { | |
389 | buf_len += 32 * 1024; | |
390 | symb = bfd_realloc (symb, buf_len); | |
391 | if (symb == NULL) | |
392 | goto error_return; | |
393 | symb_rover = symb + num_chars; | |
394 | } | |
395 | * symb_rover ++ = * str; | |
a56b48eb NC |
396 | sum_chars += *str; |
397 | num_chars ++; | |
252b5132 RH |
398 | if (*str == '(') |
399 | { | |
400 | /* Skip the file number. */ | |
401 | ++str; | |
3882b010 | 402 | while (ISDIGIT (*str)) |
252b5132 RH |
403 | ++str; |
404 | --str; | |
405 | } | |
406 | } | |
407 | } | |
408 | } | |
409 | ||
66a695f0 NC |
410 | BFD_ASSERT (num_chars == (bfd_vma) (symb_rover - symb)); |
411 | ||
252b5132 RH |
412 | /* If we have already included a header file with the same |
413 | value, then replaced this one with an N_EXCL symbol. */ | |
414 | incl_entry = stab_link_includes_lookup (&sinfo->includes, string, | |
b34976b6 | 415 | TRUE, TRUE); |
252b5132 RH |
416 | if (incl_entry == NULL) |
417 | goto error_return; | |
418 | ||
419 | for (t = incl_entry->totals; t != NULL; t = t->next) | |
66a695f0 NC |
420 | if (t->sum_chars == sum_chars |
421 | && t->num_chars == num_chars | |
422 | && memcmp (t->symb, symb, num_chars) == 0) | |
252b5132 RH |
423 | break; |
424 | ||
425 | /* Record this symbol, so that we can set the value | |
b34976b6 | 426 | correctly. */ |
dc810e39 AM |
427 | amt = sizeof *ne; |
428 | ne = (struct stab_excl_list *) bfd_alloc (abfd, amt); | |
252b5132 RH |
429 | if (ne == NULL) |
430 | goto error_return; | |
431 | ne->offset = sym - stabbuf; | |
a56b48eb | 432 | ne->val = sum_chars; |
d45913a0 | 433 | ne->type = (int) N_BINCL; |
252b5132 RH |
434 | ne->next = secinfo->excls; |
435 | secinfo->excls = ne; | |
436 | ||
437 | if (t == NULL) | |
438 | { | |
439 | /* This is the first time we have seen this header file | |
440 | with this set of stabs strings. */ | |
441 | t = ((struct stab_link_includes_totals *) | |
442 | bfd_hash_allocate (&sinfo->includes.root, sizeof *t)); | |
443 | if (t == NULL) | |
444 | goto error_return; | |
a56b48eb NC |
445 | t->sum_chars = sum_chars; |
446 | t->num_chars = num_chars; | |
66a695f0 | 447 | t->symb = bfd_realloc (symb, num_chars); /* Trim data down. */ |
252b5132 RH |
448 | t->next = incl_entry->totals; |
449 | incl_entry->totals = t; | |
450 | } | |
451 | else | |
452 | { | |
453 | bfd_size_type *incl_pstridx; | |
454 | ||
455 | /* We have seen this header file before. Tell the final | |
456 | pass to change the type to N_EXCL. */ | |
d45913a0 | 457 | ne->type = (int) N_EXCL; |
252b5132 | 458 | |
66a695f0 NC |
459 | /* Free off superfluous symbols. */ |
460 | free (symb); | |
461 | ||
252b5132 RH |
462 | /* Mark the skipped symbols. */ |
463 | ||
464 | nest = 0; | |
465 | for (incl_sym = sym + STABSIZE, incl_pstridx = pstridx + 1; | |
466 | incl_sym < symend; | |
467 | incl_sym += STABSIZE, ++incl_pstridx) | |
468 | { | |
469 | int incl_type; | |
470 | ||
471 | incl_type = incl_sym[TYPEOFF]; | |
472 | ||
d45913a0 | 473 | if (incl_type == (int) N_EINCL) |
252b5132 RH |
474 | { |
475 | if (nest == 0) | |
476 | { | |
477 | *incl_pstridx = (bfd_size_type) -1; | |
478 | ++skip; | |
479 | break; | |
480 | } | |
481 | --nest; | |
482 | } | |
d45913a0 | 483 | else if (incl_type == (int) N_BINCL) |
252b5132 | 484 | ++nest; |
3d456464 NC |
485 | else if (incl_type == (int) N_EXCL) |
486 | /* Keep existing exclusion marks. */ | |
487 | continue; | |
252b5132 RH |
488 | else if (nest == 0) |
489 | { | |
490 | *incl_pstridx = (bfd_size_type) -1; | |
491 | ++skip; | |
492 | } | |
493 | } | |
494 | } | |
495 | } | |
496 | } | |
497 | ||
498 | free (stabbuf); | |
499 | stabbuf = NULL; | |
500 | free (stabstrbuf); | |
501 | stabstrbuf = NULL; | |
502 | ||
503 | /* We need to set the section sizes such that the linker will | |
504 | compute the output section sizes correctly. We set the .stab | |
505 | size to not include the entries we don't want. We set | |
506 | SEC_EXCLUDE for the .stabstr section, so that it will be dropped | |
507 | from the link. We record the size of the strtab in the first | |
508 | .stabstr section we saw, and make sure we don't set SEC_EXCLUDE | |
509 | for that section. */ | |
eea6121a AM |
510 | stabsec->size = (count - skip) * STABSIZE; |
511 | if (stabsec->size == 0) | |
252b5132 RH |
512 | stabsec->flags |= SEC_EXCLUDE; |
513 | stabstrsec->flags |= SEC_EXCLUDE; | |
eea6121a | 514 | sinfo->stabstr->size = _bfd_stringtab_size (sinfo->strings); |
252b5132 RH |
515 | |
516 | /* Calculate the `cumulative_skips' array now that stabs have been | |
7b82c249 | 517 | deleted for this section. */ |
252b5132 RH |
518 | |
519 | if (skip != 0) | |
520 | { | |
521 | bfd_size_type i, offset; | |
522 | bfd_size_type *pskips; | |
523 | ||
dc810e39 AM |
524 | amt = count * sizeof (bfd_size_type); |
525 | secinfo->cumulative_skips = (bfd_size_type *) bfd_alloc (abfd, amt); | |
252b5132 RH |
526 | if (secinfo->cumulative_skips == NULL) |
527 | goto error_return; | |
528 | ||
529 | pskips = secinfo->cumulative_skips; | |
530 | pstridx = secinfo->stridxs; | |
531 | offset = 0; | |
532 | ||
533 | for (i = 0; i < count; i++, pskips++, pstridx++) | |
534 | { | |
535 | *pskips = offset; | |
536 | if (*pstridx == (bfd_size_type) -1) | |
537 | offset += STABSIZE; | |
538 | } | |
539 | ||
540 | BFD_ASSERT (offset != 0); | |
541 | } | |
542 | ||
b34976b6 | 543 | return TRUE; |
252b5132 RH |
544 | |
545 | error_return: | |
546 | if (stabbuf != NULL) | |
547 | free (stabbuf); | |
548 | if (stabstrbuf != NULL) | |
549 | free (stabstrbuf); | |
b34976b6 | 550 | return FALSE; |
252b5132 | 551 | } |
73d074b4 DJ |
552 | \f |
553 | /* This function is called for each input file before the stab | |
554 | section is relocated. It discards stab entries for discarded | |
b34976b6 | 555 | functions and variables. The function returns TRUE iff |
73d074b4 DJ |
556 | any entries have been deleted. |
557 | */ | |
558 | ||
b34976b6 | 559 | bfd_boolean |
73d074b4 DJ |
560 | _bfd_discard_section_stabs (abfd, stabsec, psecinfo, |
561 | reloc_symbol_deleted_p, cookie) | |
562 | bfd *abfd; | |
563 | asection *stabsec; | |
564 | PTR psecinfo; | |
b34976b6 | 565 | bfd_boolean (*reloc_symbol_deleted_p) PARAMS ((bfd_vma, PTR)); |
73d074b4 DJ |
566 | PTR cookie; |
567 | { | |
568 | bfd_size_type count, amt; | |
569 | struct stab_section_info *secinfo; | |
570 | bfd_byte *stabbuf = NULL; | |
571 | bfd_byte *sym, *symend; | |
572 | bfd_size_type skip; | |
573 | bfd_size_type *pstridx; | |
574 | int deleting; | |
575 | ||
eea6121a | 576 | if (stabsec->size == 0) |
73d074b4 DJ |
577 | { |
578 | /* This file does not contain stabs debugging information. */ | |
b34976b6 | 579 | return FALSE; |
73d074b4 DJ |
580 | } |
581 | ||
eea6121a | 582 | if (stabsec->size % STABSIZE != 0) |
73d074b4 DJ |
583 | { |
584 | /* Something is wrong with the format of these stab symbols. | |
b34976b6 AM |
585 | Don't try to optimize them. */ |
586 | return FALSE; | |
73d074b4 DJ |
587 | } |
588 | ||
589 | if ((stabsec->output_section != NULL | |
590 | && bfd_is_abs_section (stabsec->output_section))) | |
591 | { | |
592 | /* At least one of the sections is being discarded from the | |
b34976b6 AM |
593 | link, so we should just ignore them. */ |
594 | return FALSE; | |
73d074b4 DJ |
595 | } |
596 | ||
597 | /* We should have initialized our data in _bfd_link_stab_sections. | |
598 | If there was some bizarre error reading the string sections, though, | |
599 | we might not have. Bail rather than asserting. */ | |
600 | if (psecinfo == NULL) | |
b34976b6 | 601 | return FALSE; |
73d074b4 | 602 | |
eea6121a | 603 | count = stabsec->rawsize / STABSIZE; |
73d074b4 DJ |
604 | secinfo = (struct stab_section_info *) psecinfo; |
605 | ||
606 | /* Read the stabs information from abfd. */ | |
607 | ||
eea6121a | 608 | if (!bfd_malloc_and_get_section (abfd, stabsec, &stabbuf)) |
73d074b4 DJ |
609 | goto error_return; |
610 | ||
611 | /* Look through the stabs symbols and discard any information for | |
612 | discarded functions. */ | |
613 | ||
614 | skip = 0; | |
615 | deleting = -1; | |
616 | ||
eea6121a | 617 | symend = stabbuf + stabsec->rawsize; |
73d074b4 DJ |
618 | for (sym = stabbuf, pstridx = secinfo->stridxs; |
619 | sym < symend; | |
620 | sym += STABSIZE, ++pstridx) | |
621 | { | |
622 | int type; | |
623 | ||
624 | if (*pstridx == (bfd_size_type) -1) | |
625 | { | |
626 | /* This stab was deleted in a previous pass. */ | |
627 | continue; | |
628 | } | |
629 | ||
630 | type = sym[TYPEOFF]; | |
631 | ||
d45913a0 | 632 | if (type == (int) N_FUN) |
73d074b4 DJ |
633 | { |
634 | int strx = bfd_get_32 (abfd, sym + STRDXOFF); | |
635 | ||
636 | if (strx == 0) | |
637 | { | |
638 | if (deleting) | |
639 | { | |
640 | skip++; | |
641 | *pstridx = -1; | |
642 | } | |
643 | deleting = -1; | |
644 | continue; | |
645 | } | |
646 | deleting = 0; | |
647 | if ((*reloc_symbol_deleted_p) (sym + VALOFF - stabbuf, cookie)) | |
648 | deleting = 1; | |
649 | } | |
650 | ||
651 | if (deleting == 1) | |
652 | { | |
653 | *pstridx = -1; | |
654 | skip++; | |
655 | } | |
656 | else if (deleting == -1) | |
657 | { | |
658 | /* Outside of a function. Check for deleted variables. */ | |
d45913a0 | 659 | if (type == (int) N_STSYM || type == (int) N_LCSYM) |
73d074b4 DJ |
660 | if ((*reloc_symbol_deleted_p) (sym + VALOFF - stabbuf, cookie)) |
661 | { | |
662 | *pstridx = -1; | |
663 | skip ++; | |
664 | } | |
665 | /* We should also check for N_GSYM entries which reference a | |
666 | deleted global, but those are less harmful to debuggers | |
667 | and would require parsing the stab strings. */ | |
668 | } | |
669 | } | |
670 | ||
671 | free (stabbuf); | |
672 | stabbuf = NULL; | |
673 | ||
674 | /* Shrink the stabsec as needed. */ | |
eea6121a AM |
675 | stabsec->size -= skip * STABSIZE; |
676 | if (stabsec->size == 0) | |
73d074b4 DJ |
677 | stabsec->flags |= SEC_EXCLUDE; |
678 | ||
679 | /* Recalculate the `cumulative_skips' array now that stabs have been | |
680 | deleted for this section. */ | |
681 | ||
682 | if (skip != 0) | |
683 | { | |
684 | bfd_size_type i, offset; | |
685 | bfd_size_type *pskips; | |
686 | ||
687 | if (secinfo->cumulative_skips == NULL) | |
688 | { | |
689 | amt = count * sizeof (bfd_size_type); | |
690 | secinfo->cumulative_skips = (bfd_size_type *) bfd_alloc (abfd, amt); | |
691 | if (secinfo->cumulative_skips == NULL) | |
692 | goto error_return; | |
693 | } | |
694 | ||
695 | pskips = secinfo->cumulative_skips; | |
696 | pstridx = secinfo->stridxs; | |
697 | offset = 0; | |
698 | ||
699 | for (i = 0; i < count; i++, pskips++, pstridx++) | |
700 | { | |
701 | *pskips = offset; | |
702 | if (*pstridx == (bfd_size_type) -1) | |
703 | offset += STABSIZE; | |
704 | } | |
705 | ||
706 | BFD_ASSERT (offset != 0); | |
707 | } | |
708 | ||
b34976b6 | 709 | return skip > 0; |
73d074b4 DJ |
710 | |
711 | error_return: | |
712 | if (stabbuf != NULL) | |
713 | free (stabbuf); | |
b34976b6 | 714 | return FALSE; |
73d074b4 DJ |
715 | } |
716 | ||
252b5132 RH |
717 | /* Write out the stab section. This is called with the relocated |
718 | contents. */ | |
719 | ||
b34976b6 | 720 | bfd_boolean |
252b5132 RH |
721 | _bfd_write_section_stabs (output_bfd, psinfo, stabsec, psecinfo, contents) |
722 | bfd *output_bfd; | |
723 | PTR *psinfo; | |
724 | asection *stabsec; | |
725 | PTR *psecinfo; | |
726 | bfd_byte *contents; | |
727 | { | |
728 | struct stab_info *sinfo; | |
729 | struct stab_section_info *secinfo; | |
730 | struct stab_excl_list *e; | |
731 | bfd_byte *sym, *tosym, *symend; | |
732 | bfd_size_type *pstridx; | |
733 | ||
734 | sinfo = (struct stab_info *) *psinfo; | |
735 | secinfo = (struct stab_section_info *) *psecinfo; | |
736 | ||
737 | if (secinfo == NULL) | |
738 | return bfd_set_section_contents (output_bfd, stabsec->output_section, | |
eea6121a AM |
739 | contents, stabsec->output_offset, |
740 | stabsec->size); | |
252b5132 RH |
741 | |
742 | /* Handle each N_BINCL entry. */ | |
743 | for (e = secinfo->excls; e != NULL; e = e->next) | |
744 | { | |
745 | bfd_byte *excl_sym; | |
746 | ||
eea6121a | 747 | BFD_ASSERT (e->offset < stabsec->rawsize); |
252b5132 RH |
748 | excl_sym = contents + e->offset; |
749 | bfd_put_32 (output_bfd, e->val, excl_sym + VALOFF); | |
750 | excl_sym[TYPEOFF] = e->type; | |
751 | } | |
752 | ||
753 | /* Copy over all the stabs symbols, omitting the ones we don't want, | |
754 | and correcting the string indices for those we do want. */ | |
755 | tosym = contents; | |
eea6121a | 756 | symend = contents + stabsec->rawsize; |
252b5132 RH |
757 | for (sym = contents, pstridx = secinfo->stridxs; |
758 | sym < symend; | |
759 | sym += STABSIZE, ++pstridx) | |
760 | { | |
761 | if (*pstridx != (bfd_size_type) -1) | |
762 | { | |
763 | if (tosym != sym) | |
764 | memcpy (tosym, sym, STABSIZE); | |
765 | bfd_put_32 (output_bfd, *pstridx, tosym + STRDXOFF); | |
766 | ||
767 | if (sym[TYPEOFF] == 0) | |
768 | { | |
769 | /* This is the header symbol for the stabs section. We | |
b34976b6 AM |
770 | don't really need one, since we have merged all the |
771 | input stabs sections into one, but we generate one | |
772 | for the benefit of readers which expect to see one. */ | |
252b5132 RH |
773 | BFD_ASSERT (sym == contents); |
774 | bfd_put_32 (output_bfd, _bfd_stringtab_size (sinfo->strings), | |
775 | tosym + VALOFF); | |
776 | bfd_put_16 (output_bfd, | |
eea6121a | 777 | stabsec->output_section->size / STABSIZE - 1, |
252b5132 RH |
778 | tosym + DESCOFF); |
779 | } | |
780 | ||
781 | tosym += STABSIZE; | |
782 | } | |
783 | } | |
784 | ||
eea6121a | 785 | BFD_ASSERT ((bfd_size_type) (tosym - contents) == stabsec->size); |
252b5132 RH |
786 | |
787 | return bfd_set_section_contents (output_bfd, stabsec->output_section, | |
dc810e39 | 788 | contents, (file_ptr) stabsec->output_offset, |
eea6121a | 789 | stabsec->size); |
252b5132 RH |
790 | } |
791 | ||
792 | /* Write out the .stabstr section. */ | |
793 | ||
b34976b6 | 794 | bfd_boolean |
252b5132 RH |
795 | _bfd_write_stab_strings (output_bfd, psinfo) |
796 | bfd *output_bfd; | |
797 | PTR *psinfo; | |
798 | { | |
799 | struct stab_info *sinfo; | |
800 | ||
801 | sinfo = (struct stab_info *) *psinfo; | |
802 | ||
803 | if (sinfo == NULL) | |
b34976b6 | 804 | return TRUE; |
252b5132 RH |
805 | |
806 | if (bfd_is_abs_section (sinfo->stabstr->output_section)) | |
807 | { | |
808 | /* The section was discarded from the link. */ | |
b34976b6 | 809 | return TRUE; |
252b5132 RH |
810 | } |
811 | ||
812 | BFD_ASSERT ((sinfo->stabstr->output_offset | |
813 | + _bfd_stringtab_size (sinfo->strings)) | |
eea6121a | 814 | <= sinfo->stabstr->output_section->size); |
252b5132 RH |
815 | |
816 | if (bfd_seek (output_bfd, | |
dc810e39 AM |
817 | (file_ptr) (sinfo->stabstr->output_section->filepos |
818 | + sinfo->stabstr->output_offset), | |
252b5132 | 819 | SEEK_SET) != 0) |
b34976b6 | 820 | return FALSE; |
252b5132 RH |
821 | |
822 | if (! _bfd_stringtab_emit (output_bfd, sinfo->strings)) | |
b34976b6 | 823 | return FALSE; |
252b5132 RH |
824 | |
825 | /* We no longer need the stabs information. */ | |
826 | _bfd_stringtab_free (sinfo->strings); | |
827 | bfd_hash_table_free (&sinfo->includes.root); | |
828 | ||
b34976b6 | 829 | return TRUE; |
252b5132 RH |
830 | } |
831 | ||
832 | /* Adjust an address in the .stab section. Given OFFSET within | |
833 | STABSEC, this returns the new offset in the adjusted stab section, | |
834 | or -1 if the address refers to a stab which has been removed. */ | |
835 | ||
836 | bfd_vma | |
eea6121a | 837 | _bfd_stab_section_offset (stabsec, psecinfo, offset) |
252b5132 | 838 | asection *stabsec; |
eea6121a | 839 | PTR psecinfo; |
252b5132 RH |
840 | bfd_vma offset; |
841 | { | |
842 | struct stab_section_info *secinfo; | |
843 | ||
eea6121a | 844 | secinfo = (struct stab_section_info *) psecinfo; |
252b5132 RH |
845 | |
846 | if (secinfo == NULL) | |
847 | return offset; | |
848 | ||
eea6121a AM |
849 | if (offset >= stabsec->rawsize) |
850 | return offset - stabsec->rawsize + stabsec->size; | |
252b5132 RH |
851 | |
852 | if (secinfo->cumulative_skips) | |
853 | { | |
854 | bfd_vma i; | |
855 | ||
856 | i = offset / STABSIZE; | |
857 | ||
858 | if (secinfo->stridxs [i] == (bfd_size_type) -1) | |
859 | return (bfd_vma) -1; | |
860 | ||
861 | return offset - secinfo->cumulative_skips [i]; | |
862 | } | |
863 | ||
864 | return offset; | |
865 | } |