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 | ||
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 | ||
197 | if (stabsec->_raw_size == 0 | |
198 | || stabstrsec->_raw_size == 0) | |
199 | { | |
200 | /* This file does not contain stabs debugging information. */ | |
b34976b6 | 201 | return TRUE; |
252b5132 RH |
202 | } |
203 | ||
204 | if (stabsec->_raw_size % STABSIZE != 0) | |
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 | ||
257 | count = stabsec->_raw_size / STABSIZE; | |
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; | |
267 | secinfo->cumulative_skips = NULL; | |
dc810e39 | 268 | memset (secinfo->stridxs, 0, (size_t) count * sizeof (bfd_size_type)); |
252b5132 RH |
269 | |
270 | /* Read the stabs information from abfd. */ | |
271 | ||
272 | stabbuf = (bfd_byte *) bfd_malloc (stabsec->_raw_size); | |
273 | stabstrbuf = (bfd_byte *) bfd_malloc (stabstrsec->_raw_size); | |
274 | if (stabbuf == NULL || stabstrbuf == NULL) | |
275 | goto error_return; | |
276 | ||
dc810e39 | 277 | if (! bfd_get_section_contents (abfd, stabsec, stabbuf, (bfd_vma) 0, |
252b5132 | 278 | stabsec->_raw_size) |
dc810e39 | 279 | || ! bfd_get_section_contents (abfd, stabstrsec, stabstrbuf, (bfd_vma) 0, |
252b5132 RH |
280 | stabstrsec->_raw_size)) |
281 | goto error_return; | |
282 | ||
283 | /* Look through the stabs symbols, work out the new string indices, | |
284 | and identify N_BINCL symbols which can be eliminated. */ | |
285 | ||
286 | stroff = 0; | |
29ca8dc5 NS |
287 | /* The stabs sections can be split when |
288 | -split-by-reloc/-split-by-file is used. We must keep track of | |
289 | each stab section's place in the single concatenated string | |
290 | table. */ | |
291 | next_stroff = pstring_offset ? *pstring_offset : 0; | |
252b5132 RH |
292 | skip = 0; |
293 | ||
294 | symend = stabbuf + stabsec->_raw_size; | |
295 | for (sym = stabbuf, pstridx = secinfo->stridxs; | |
296 | sym < symend; | |
297 | sym += STABSIZE, ++pstridx) | |
298 | { | |
644c4c80 | 299 | bfd_size_type symstroff; |
252b5132 RH |
300 | int type; |
301 | const char *string; | |
302 | ||
303 | if (*pstridx != 0) | |
304 | { | |
305 | /* This symbol has already been handled by an N_BINCL pass. */ | |
306 | continue; | |
307 | } | |
308 | ||
309 | type = sym[TYPEOFF]; | |
310 | ||
311 | if (type == 0) | |
312 | { | |
313 | /* Special type 0 stabs indicate the offset to the next | |
b34976b6 | 314 | string table. We only copy the very first one. */ |
252b5132 RH |
315 | stroff = next_stroff; |
316 | next_stroff += bfd_get_32 (abfd, sym + 8); | |
29ca8dc5 NS |
317 | if (pstring_offset) |
318 | *pstring_offset = next_stroff; | |
252b5132 RH |
319 | if (! first) |
320 | { | |
321 | *pstridx = (bfd_size_type) -1; | |
322 | ++skip; | |
323 | continue; | |
324 | } | |
b34976b6 | 325 | first = FALSE; |
252b5132 RH |
326 | } |
327 | ||
328 | /* Store the string in the hash table, and record the index. */ | |
644c4c80 RS |
329 | symstroff = stroff + bfd_get_32 (abfd, sym + STRDXOFF); |
330 | if (symstroff >= stabstrsec->_raw_size) | |
331 | { | |
332 | (*_bfd_error_handler) | |
333 | (_("%s(%s+0x%lx): Stabs entry has invalid string index."), | |
334 | bfd_archive_filename (abfd), | |
335 | bfd_get_section_name (abfd, stabsec), | |
336 | (long) (sym - stabbuf)); | |
337 | bfd_set_error (bfd_error_bad_value); | |
338 | goto error_return; | |
339 | } | |
340 | string = (char *) stabstrbuf + symstroff; | |
b34976b6 | 341 | *pstridx = _bfd_stringtab_add (sinfo->strings, string, TRUE, TRUE); |
252b5132 RH |
342 | |
343 | /* An N_BINCL symbol indicates the start of the stabs entries | |
344 | for a header file. We need to scan ahead to the next N_EINCL | |
345 | symbol, ignoring nesting, adding up all the characters in the | |
346 | symbol names, not including the file numbers in types (the | |
347 | first number after an open parenthesis). */ | |
d45913a0 | 348 | if (type == (int) N_BINCL) |
252b5132 | 349 | { |
a56b48eb NC |
350 | bfd_vma sum_chars; |
351 | bfd_vma num_chars; | |
66a695f0 NC |
352 | bfd_vma buf_len = 0; |
353 | char * symb; | |
354 | char * symb_rover; | |
252b5132 | 355 | int nest; |
66a695f0 NC |
356 | bfd_byte * incl_sym; |
357 | struct stab_link_includes_entry * incl_entry; | |
358 | struct stab_link_includes_totals * t; | |
359 | struct stab_excl_list * ne; | |
252b5132 | 360 | |
66a695f0 | 361 | symb = symb_rover = NULL; |
a56b48eb | 362 | sum_chars = num_chars = 0; |
252b5132 | 363 | nest = 0; |
66a695f0 | 364 | |
252b5132 RH |
365 | for (incl_sym = sym + STABSIZE; |
366 | incl_sym < symend; | |
367 | incl_sym += STABSIZE) | |
368 | { | |
369 | int incl_type; | |
370 | ||
371 | incl_type = incl_sym[TYPEOFF]; | |
372 | if (incl_type == 0) | |
373 | break; | |
955a76eb NC |
374 | else if (incl_type == (int) N_EXCL) |
375 | continue; | |
d45913a0 | 376 | else if (incl_type == (int) N_EINCL) |
252b5132 RH |
377 | { |
378 | if (nest == 0) | |
379 | break; | |
380 | --nest; | |
381 | } | |
d45913a0 | 382 | else if (incl_type == (int) N_BINCL) |
252b5132 RH |
383 | ++nest; |
384 | else if (nest == 0) | |
385 | { | |
386 | const char *str; | |
387 | ||
388 | str = ((char *) stabstrbuf | |
389 | + stroff | |
390 | + bfd_get_32 (abfd, incl_sym + STRDXOFF)); | |
391 | for (; *str != '\0'; str++) | |
392 | { | |
66a695f0 NC |
393 | if (num_chars >= buf_len) |
394 | { | |
395 | buf_len += 32 * 1024; | |
396 | symb = bfd_realloc (symb, buf_len); | |
397 | if (symb == NULL) | |
398 | goto error_return; | |
399 | symb_rover = symb + num_chars; | |
400 | } | |
401 | * symb_rover ++ = * str; | |
a56b48eb NC |
402 | sum_chars += *str; |
403 | num_chars ++; | |
252b5132 RH |
404 | if (*str == '(') |
405 | { | |
406 | /* Skip the file number. */ | |
407 | ++str; | |
3882b010 | 408 | while (ISDIGIT (*str)) |
252b5132 RH |
409 | ++str; |
410 | --str; | |
411 | } | |
412 | } | |
413 | } | |
414 | } | |
415 | ||
66a695f0 NC |
416 | BFD_ASSERT (num_chars == (bfd_vma) (symb_rover - symb)); |
417 | ||
252b5132 RH |
418 | /* If we have already included a header file with the same |
419 | value, then replaced this one with an N_EXCL symbol. */ | |
420 | incl_entry = stab_link_includes_lookup (&sinfo->includes, string, | |
b34976b6 | 421 | TRUE, TRUE); |
252b5132 RH |
422 | if (incl_entry == NULL) |
423 | goto error_return; | |
424 | ||
425 | for (t = incl_entry->totals; t != NULL; t = t->next) | |
66a695f0 NC |
426 | if (t->sum_chars == sum_chars |
427 | && t->num_chars == num_chars | |
428 | && memcmp (t->symb, symb, num_chars) == 0) | |
252b5132 RH |
429 | break; |
430 | ||
431 | /* Record this symbol, so that we can set the value | |
b34976b6 | 432 | correctly. */ |
dc810e39 AM |
433 | amt = sizeof *ne; |
434 | ne = (struct stab_excl_list *) bfd_alloc (abfd, amt); | |
252b5132 RH |
435 | if (ne == NULL) |
436 | goto error_return; | |
437 | ne->offset = sym - stabbuf; | |
a56b48eb | 438 | ne->val = sum_chars; |
d45913a0 | 439 | ne->type = (int) N_BINCL; |
252b5132 RH |
440 | ne->next = secinfo->excls; |
441 | secinfo->excls = ne; | |
442 | ||
443 | if (t == NULL) | |
444 | { | |
445 | /* This is the first time we have seen this header file | |
446 | with this set of stabs strings. */ | |
447 | t = ((struct stab_link_includes_totals *) | |
448 | bfd_hash_allocate (&sinfo->includes.root, sizeof *t)); | |
449 | if (t == NULL) | |
450 | goto error_return; | |
a56b48eb NC |
451 | t->sum_chars = sum_chars; |
452 | t->num_chars = num_chars; | |
66a695f0 | 453 | t->symb = bfd_realloc (symb, num_chars); /* Trim data down. */ |
252b5132 RH |
454 | t->next = incl_entry->totals; |
455 | incl_entry->totals = t; | |
456 | } | |
457 | else | |
458 | { | |
459 | bfd_size_type *incl_pstridx; | |
460 | ||
461 | /* We have seen this header file before. Tell the final | |
462 | pass to change the type to N_EXCL. */ | |
d45913a0 | 463 | ne->type = (int) N_EXCL; |
252b5132 | 464 | |
66a695f0 NC |
465 | /* Free off superfluous symbols. */ |
466 | free (symb); | |
467 | ||
252b5132 RH |
468 | /* Mark the skipped symbols. */ |
469 | ||
470 | nest = 0; | |
471 | for (incl_sym = sym + STABSIZE, incl_pstridx = pstridx + 1; | |
472 | incl_sym < symend; | |
473 | incl_sym += STABSIZE, ++incl_pstridx) | |
474 | { | |
475 | int incl_type; | |
476 | ||
477 | incl_type = incl_sym[TYPEOFF]; | |
478 | ||
d45913a0 | 479 | if (incl_type == (int) N_EINCL) |
252b5132 RH |
480 | { |
481 | if (nest == 0) | |
482 | { | |
483 | *incl_pstridx = (bfd_size_type) -1; | |
484 | ++skip; | |
485 | break; | |
486 | } | |
487 | --nest; | |
488 | } | |
d45913a0 | 489 | else if (incl_type == (int) N_BINCL) |
252b5132 | 490 | ++nest; |
3d456464 NC |
491 | else if (incl_type == (int) N_EXCL) |
492 | /* Keep existing exclusion marks. */ | |
493 | continue; | |
252b5132 RH |
494 | else if (nest == 0) |
495 | { | |
496 | *incl_pstridx = (bfd_size_type) -1; | |
497 | ++skip; | |
498 | } | |
499 | } | |
500 | } | |
501 | } | |
502 | } | |
503 | ||
504 | free (stabbuf); | |
505 | stabbuf = NULL; | |
506 | free (stabstrbuf); | |
507 | stabstrbuf = NULL; | |
508 | ||
509 | /* We need to set the section sizes such that the linker will | |
510 | compute the output section sizes correctly. We set the .stab | |
511 | size to not include the entries we don't want. We set | |
512 | SEC_EXCLUDE for the .stabstr section, so that it will be dropped | |
513 | from the link. We record the size of the strtab in the first | |
514 | .stabstr section we saw, and make sure we don't set SEC_EXCLUDE | |
515 | for that section. */ | |
516 | stabsec->_cooked_size = (count - skip) * STABSIZE; | |
517 | if (stabsec->_cooked_size == 0) | |
518 | stabsec->flags |= SEC_EXCLUDE; | |
519 | stabstrsec->flags |= SEC_EXCLUDE; | |
520 | sinfo->stabstr->_cooked_size = _bfd_stringtab_size (sinfo->strings); | |
521 | ||
522 | /* Calculate the `cumulative_skips' array now that stabs have been | |
7b82c249 | 523 | deleted for this section. */ |
252b5132 RH |
524 | |
525 | if (skip != 0) | |
526 | { | |
527 | bfd_size_type i, offset; | |
528 | bfd_size_type *pskips; | |
529 | ||
dc810e39 AM |
530 | amt = count * sizeof (bfd_size_type); |
531 | secinfo->cumulative_skips = (bfd_size_type *) bfd_alloc (abfd, amt); | |
252b5132 RH |
532 | if (secinfo->cumulative_skips == NULL) |
533 | goto error_return; | |
534 | ||
535 | pskips = secinfo->cumulative_skips; | |
536 | pstridx = secinfo->stridxs; | |
537 | offset = 0; | |
538 | ||
539 | for (i = 0; i < count; i++, pskips++, pstridx++) | |
540 | { | |
541 | *pskips = offset; | |
542 | if (*pstridx == (bfd_size_type) -1) | |
543 | offset += STABSIZE; | |
544 | } | |
545 | ||
546 | BFD_ASSERT (offset != 0); | |
547 | } | |
548 | ||
b34976b6 | 549 | return TRUE; |
252b5132 RH |
550 | |
551 | error_return: | |
552 | if (stabbuf != NULL) | |
553 | free (stabbuf); | |
554 | if (stabstrbuf != NULL) | |
555 | free (stabstrbuf); | |
b34976b6 | 556 | return FALSE; |
252b5132 RH |
557 | } |
558 | ||
73d074b4 DJ |
559 | \f |
560 | /* This function is called for each input file before the stab | |
561 | section is relocated. It discards stab entries for discarded | |
b34976b6 | 562 | functions and variables. The function returns TRUE iff |
73d074b4 DJ |
563 | any entries have been deleted. |
564 | */ | |
565 | ||
b34976b6 | 566 | bfd_boolean |
73d074b4 DJ |
567 | _bfd_discard_section_stabs (abfd, stabsec, psecinfo, |
568 | reloc_symbol_deleted_p, cookie) | |
569 | bfd *abfd; | |
570 | asection *stabsec; | |
571 | PTR psecinfo; | |
b34976b6 | 572 | bfd_boolean (*reloc_symbol_deleted_p) PARAMS ((bfd_vma, PTR)); |
73d074b4 DJ |
573 | PTR cookie; |
574 | { | |
575 | bfd_size_type count, amt; | |
576 | struct stab_section_info *secinfo; | |
577 | bfd_byte *stabbuf = NULL; | |
578 | bfd_byte *sym, *symend; | |
579 | bfd_size_type skip; | |
580 | bfd_size_type *pstridx; | |
581 | int deleting; | |
582 | ||
583 | if (stabsec->_raw_size == 0) | |
584 | { | |
585 | /* This file does not contain stabs debugging information. */ | |
b34976b6 | 586 | return FALSE; |
73d074b4 DJ |
587 | } |
588 | ||
589 | if (stabsec->_raw_size % STABSIZE != 0) | |
590 | { | |
591 | /* Something is wrong with the format of these stab symbols. | |
b34976b6 AM |
592 | Don't try to optimize them. */ |
593 | return FALSE; | |
73d074b4 DJ |
594 | } |
595 | ||
596 | if ((stabsec->output_section != NULL | |
597 | && bfd_is_abs_section (stabsec->output_section))) | |
598 | { | |
599 | /* At least one of the sections is being discarded from the | |
b34976b6 AM |
600 | link, so we should just ignore them. */ |
601 | return FALSE; | |
73d074b4 DJ |
602 | } |
603 | ||
604 | /* We should have initialized our data in _bfd_link_stab_sections. | |
605 | If there was some bizarre error reading the string sections, though, | |
606 | we might not have. Bail rather than asserting. */ | |
607 | if (psecinfo == NULL) | |
b34976b6 | 608 | return FALSE; |
73d074b4 DJ |
609 | |
610 | count = stabsec->_raw_size / STABSIZE; | |
611 | secinfo = (struct stab_section_info *) psecinfo; | |
612 | ||
613 | /* Read the stabs information from abfd. */ | |
614 | ||
615 | stabbuf = (bfd_byte *) bfd_malloc (stabsec->_raw_size); | |
616 | if (stabbuf == NULL) | |
617 | goto error_return; | |
618 | ||
619 | if (! bfd_get_section_contents (abfd, stabsec, stabbuf, (bfd_vma) 0, | |
620 | stabsec->_raw_size)) | |
621 | goto error_return; | |
622 | ||
623 | /* Look through the stabs symbols and discard any information for | |
624 | discarded functions. */ | |
625 | ||
626 | skip = 0; | |
627 | deleting = -1; | |
628 | ||
629 | symend = stabbuf + stabsec->_raw_size; | |
630 | for (sym = stabbuf, pstridx = secinfo->stridxs; | |
631 | sym < symend; | |
632 | sym += STABSIZE, ++pstridx) | |
633 | { | |
634 | int type; | |
635 | ||
636 | if (*pstridx == (bfd_size_type) -1) | |
637 | { | |
638 | /* This stab was deleted in a previous pass. */ | |
639 | continue; | |
640 | } | |
641 | ||
642 | type = sym[TYPEOFF]; | |
643 | ||
d45913a0 | 644 | if (type == (int) N_FUN) |
73d074b4 DJ |
645 | { |
646 | int strx = bfd_get_32 (abfd, sym + STRDXOFF); | |
647 | ||
648 | if (strx == 0) | |
649 | { | |
650 | if (deleting) | |
651 | { | |
652 | skip++; | |
653 | *pstridx = -1; | |
654 | } | |
655 | deleting = -1; | |
656 | continue; | |
657 | } | |
658 | deleting = 0; | |
659 | if ((*reloc_symbol_deleted_p) (sym + VALOFF - stabbuf, cookie)) | |
660 | deleting = 1; | |
661 | } | |
662 | ||
663 | if (deleting == 1) | |
664 | { | |
665 | *pstridx = -1; | |
666 | skip++; | |
667 | } | |
668 | else if (deleting == -1) | |
669 | { | |
670 | /* Outside of a function. Check for deleted variables. */ | |
d45913a0 | 671 | if (type == (int) N_STSYM || type == (int) N_LCSYM) |
73d074b4 DJ |
672 | if ((*reloc_symbol_deleted_p) (sym + VALOFF - stabbuf, cookie)) |
673 | { | |
674 | *pstridx = -1; | |
675 | skip ++; | |
676 | } | |
677 | /* We should also check for N_GSYM entries which reference a | |
678 | deleted global, but those are less harmful to debuggers | |
679 | and would require parsing the stab strings. */ | |
680 | } | |
681 | } | |
682 | ||
683 | free (stabbuf); | |
684 | stabbuf = NULL; | |
685 | ||
686 | /* Shrink the stabsec as needed. */ | |
687 | stabsec->_cooked_size -= skip * STABSIZE; | |
688 | if (stabsec->_cooked_size == 0) | |
689 | stabsec->flags |= SEC_EXCLUDE; | |
690 | ||
691 | /* Recalculate the `cumulative_skips' array now that stabs have been | |
692 | deleted for this section. */ | |
693 | ||
694 | if (skip != 0) | |
695 | { | |
696 | bfd_size_type i, offset; | |
697 | bfd_size_type *pskips; | |
698 | ||
699 | if (secinfo->cumulative_skips == NULL) | |
700 | { | |
701 | amt = count * sizeof (bfd_size_type); | |
702 | secinfo->cumulative_skips = (bfd_size_type *) bfd_alloc (abfd, amt); | |
703 | if (secinfo->cumulative_skips == NULL) | |
704 | goto error_return; | |
705 | } | |
706 | ||
707 | pskips = secinfo->cumulative_skips; | |
708 | pstridx = secinfo->stridxs; | |
709 | offset = 0; | |
710 | ||
711 | for (i = 0; i < count; i++, pskips++, pstridx++) | |
712 | { | |
713 | *pskips = offset; | |
714 | if (*pstridx == (bfd_size_type) -1) | |
715 | offset += STABSIZE; | |
716 | } | |
717 | ||
718 | BFD_ASSERT (offset != 0); | |
719 | } | |
720 | ||
b34976b6 | 721 | return skip > 0; |
73d074b4 DJ |
722 | |
723 | error_return: | |
724 | if (stabbuf != NULL) | |
725 | free (stabbuf); | |
b34976b6 | 726 | return FALSE; |
73d074b4 DJ |
727 | } |
728 | ||
252b5132 RH |
729 | /* Write out the stab section. This is called with the relocated |
730 | contents. */ | |
731 | ||
b34976b6 | 732 | bfd_boolean |
252b5132 RH |
733 | _bfd_write_section_stabs (output_bfd, psinfo, stabsec, psecinfo, contents) |
734 | bfd *output_bfd; | |
735 | PTR *psinfo; | |
736 | asection *stabsec; | |
737 | PTR *psecinfo; | |
738 | bfd_byte *contents; | |
739 | { | |
740 | struct stab_info *sinfo; | |
741 | struct stab_section_info *secinfo; | |
742 | struct stab_excl_list *e; | |
743 | bfd_byte *sym, *tosym, *symend; | |
744 | bfd_size_type *pstridx; | |
745 | ||
746 | sinfo = (struct stab_info *) *psinfo; | |
747 | secinfo = (struct stab_section_info *) *psecinfo; | |
748 | ||
749 | if (secinfo == NULL) | |
750 | return bfd_set_section_contents (output_bfd, stabsec->output_section, | |
dc810e39 AM |
751 | contents, |
752 | (file_ptr) stabsec->output_offset, | |
252b5132 RH |
753 | stabsec->_raw_size); |
754 | ||
755 | /* Handle each N_BINCL entry. */ | |
756 | for (e = secinfo->excls; e != NULL; e = e->next) | |
757 | { | |
758 | bfd_byte *excl_sym; | |
759 | ||
760 | BFD_ASSERT (e->offset < stabsec->_raw_size); | |
761 | excl_sym = contents + e->offset; | |
762 | bfd_put_32 (output_bfd, e->val, excl_sym + VALOFF); | |
763 | excl_sym[TYPEOFF] = e->type; | |
764 | } | |
765 | ||
766 | /* Copy over all the stabs symbols, omitting the ones we don't want, | |
767 | and correcting the string indices for those we do want. */ | |
768 | tosym = contents; | |
769 | symend = contents + stabsec->_raw_size; | |
770 | for (sym = contents, pstridx = secinfo->stridxs; | |
771 | sym < symend; | |
772 | sym += STABSIZE, ++pstridx) | |
773 | { | |
774 | if (*pstridx != (bfd_size_type) -1) | |
775 | { | |
776 | if (tosym != sym) | |
777 | memcpy (tosym, sym, STABSIZE); | |
778 | bfd_put_32 (output_bfd, *pstridx, tosym + STRDXOFF); | |
779 | ||
780 | if (sym[TYPEOFF] == 0) | |
781 | { | |
782 | /* This is the header symbol for the stabs section. We | |
b34976b6 AM |
783 | don't really need one, since we have merged all the |
784 | input stabs sections into one, but we generate one | |
785 | for the benefit of readers which expect to see one. */ | |
252b5132 RH |
786 | BFD_ASSERT (sym == contents); |
787 | bfd_put_32 (output_bfd, _bfd_stringtab_size (sinfo->strings), | |
788 | tosym + VALOFF); | |
789 | bfd_put_16 (output_bfd, | |
790 | stabsec->output_section->_raw_size / STABSIZE - 1, | |
791 | tosym + DESCOFF); | |
792 | } | |
793 | ||
794 | tosym += STABSIZE; | |
795 | } | |
796 | } | |
797 | ||
798 | BFD_ASSERT ((bfd_size_type) (tosym - contents) == stabsec->_cooked_size); | |
799 | ||
800 | return bfd_set_section_contents (output_bfd, stabsec->output_section, | |
dc810e39 | 801 | contents, (file_ptr) stabsec->output_offset, |
252b5132 RH |
802 | stabsec->_cooked_size); |
803 | } | |
804 | ||
805 | /* Write out the .stabstr section. */ | |
806 | ||
b34976b6 | 807 | bfd_boolean |
252b5132 RH |
808 | _bfd_write_stab_strings (output_bfd, psinfo) |
809 | bfd *output_bfd; | |
810 | PTR *psinfo; | |
811 | { | |
812 | struct stab_info *sinfo; | |
813 | ||
814 | sinfo = (struct stab_info *) *psinfo; | |
815 | ||
816 | if (sinfo == NULL) | |
b34976b6 | 817 | return TRUE; |
252b5132 RH |
818 | |
819 | if (bfd_is_abs_section (sinfo->stabstr->output_section)) | |
820 | { | |
821 | /* The section was discarded from the link. */ | |
b34976b6 | 822 | return TRUE; |
252b5132 RH |
823 | } |
824 | ||
825 | BFD_ASSERT ((sinfo->stabstr->output_offset | |
826 | + _bfd_stringtab_size (sinfo->strings)) | |
827 | <= sinfo->stabstr->output_section->_raw_size); | |
828 | ||
829 | if (bfd_seek (output_bfd, | |
dc810e39 AM |
830 | (file_ptr) (sinfo->stabstr->output_section->filepos |
831 | + sinfo->stabstr->output_offset), | |
252b5132 | 832 | SEEK_SET) != 0) |
b34976b6 | 833 | return FALSE; |
252b5132 RH |
834 | |
835 | if (! _bfd_stringtab_emit (output_bfd, sinfo->strings)) | |
b34976b6 | 836 | return FALSE; |
252b5132 RH |
837 | |
838 | /* We no longer need the stabs information. */ | |
839 | _bfd_stringtab_free (sinfo->strings); | |
840 | bfd_hash_table_free (&sinfo->includes.root); | |
841 | ||
b34976b6 | 842 | return TRUE; |
252b5132 RH |
843 | } |
844 | ||
845 | /* Adjust an address in the .stab section. Given OFFSET within | |
846 | STABSEC, this returns the new offset in the adjusted stab section, | |
847 | or -1 if the address refers to a stab which has been removed. */ | |
848 | ||
849 | bfd_vma | |
850 | _bfd_stab_section_offset (output_bfd, psinfo, stabsec, psecinfo, offset) | |
7442e600 ILT |
851 | bfd *output_bfd ATTRIBUTE_UNUSED; |
852 | PTR *psinfo ATTRIBUTE_UNUSED; | |
252b5132 RH |
853 | asection *stabsec; |
854 | PTR *psecinfo; | |
855 | bfd_vma offset; | |
856 | { | |
857 | struct stab_section_info *secinfo; | |
858 | ||
859 | secinfo = (struct stab_section_info *) *psecinfo; | |
860 | ||
861 | if (secinfo == NULL) | |
862 | return offset; | |
863 | ||
864 | if (offset >= stabsec->_raw_size) | |
865 | return offset - (stabsec->_cooked_size - stabsec->_raw_size); | |
866 | ||
867 | if (secinfo->cumulative_skips) | |
868 | { | |
869 | bfd_vma i; | |
870 | ||
871 | i = offset / STABSIZE; | |
872 | ||
873 | if (secinfo->stridxs [i] == (bfd_size_type) -1) | |
874 | return (bfd_vma) -1; | |
875 | ||
876 | return offset - secinfo->cumulative_skips [i]; | |
877 | } | |
878 | ||
879 | return offset; | |
880 | } |