Commit | Line | Data |
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f5fa8ca2 | 1 | /* SEC_MERGE support. |
7217313c | 2 | Copyright 2001, 2002 Free Software Foundation, Inc. |
f5fa8ca2 JJ |
3 | Written by Jakub Jelinek <jakub@redhat.com>. |
4 | ||
7217313c | 5 | This file is part of BFD, the Binary File Descriptor library. |
f5fa8ca2 | 6 | |
7217313c NC |
7 | This program is free software; you can redistribute it and/or modify |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
f5fa8ca2 | 11 | |
7217313c NC |
12 | This program is distributed in the hope that it will be useful, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
f5fa8ca2 | 16 | |
7217313c NC |
17 | You should have received a copy of the GNU General Public License |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
f5fa8ca2 JJ |
20 | |
21 | /* This file contains support for merging duplicate entities within sections, | |
22 | as used in ELF SHF_MERGE. */ | |
23 | ||
24 | #include "bfd.h" | |
25 | #include "sysdep.h" | |
26 | #include "libbfd.h" | |
8550eb6e | 27 | #include "hashtab.h" |
7217313c | 28 | #include "libiberty.h" |
f5fa8ca2 | 29 | |
8550eb6e JJ |
30 | struct sec_merge_sec_info; |
31 | ||
f5fa8ca2 JJ |
32 | /* An entry in the section merge hash table. */ |
33 | ||
34 | struct sec_merge_hash_entry | |
35 | { | |
36 | struct bfd_hash_entry root; | |
37 | /* Length of this entry. */ | |
38 | unsigned int len; | |
a531bbd2 JJ |
39 | /* Start of this string needs to be aligned to |
40 | alignment octets (not 1 << align). */ | |
41 | unsigned int alignment; | |
7217313c NC |
42 | union |
43 | { | |
8550eb6e JJ |
44 | /* Index within the merged section. */ |
45 | bfd_size_type index; | |
46 | /* Entity size (if present in suffix hash tables). */ | |
47 | unsigned int entsize; | |
48 | /* Entry this is a suffix of (if alignment is 0). */ | |
49 | struct sec_merge_hash_entry *suffix; | |
50 | } u; | |
f5fa8ca2 | 51 | /* Which section is it in. */ |
8550eb6e | 52 | struct sec_merge_sec_info *secinfo; |
f5fa8ca2 JJ |
53 | /* Next entity in the hash table. */ |
54 | struct sec_merge_hash_entry *next; | |
55 | }; | |
56 | ||
57 | /* The section merge hash table. */ | |
58 | ||
59 | struct sec_merge_hash | |
60 | { | |
61 | struct bfd_hash_table table; | |
62 | /* Next available index. */ | |
63 | bfd_size_type size; | |
64 | /* First entity in the SEC_MERGE sections of this type. */ | |
65 | struct sec_merge_hash_entry *first; | |
66 | /* Last entity in the SEC_MERGE sections of this type. */ | |
67 | struct sec_merge_hash_entry *last; | |
68 | /* Entity size. */ | |
69 | unsigned int entsize; | |
f5fa8ca2 JJ |
70 | /* Are entries fixed size or zero terminated strings? */ |
71 | boolean strings; | |
72 | }; | |
73 | ||
74 | struct sec_merge_info | |
75 | { | |
76 | /* Chain of sec_merge_infos. */ | |
77 | struct sec_merge_info *next; | |
8550eb6e JJ |
78 | /* Chain of sec_merge_sec_infos. */ |
79 | struct sec_merge_sec_info *chain; | |
f5fa8ca2 JJ |
80 | /* A hash table used to hold section content. */ |
81 | struct sec_merge_hash *htab; | |
f5fa8ca2 JJ |
82 | }; |
83 | ||
84 | struct sec_merge_sec_info | |
85 | { | |
8550eb6e JJ |
86 | /* Chain of sec_merge_sec_infos. */ |
87 | struct sec_merge_sec_info *next; | |
88 | /* The corresponding section. */ | |
89 | asection *sec; | |
90 | /* Pointer to merge_info pointing to us. */ | |
91 | PTR *psecinfo; | |
f5fa8ca2 JJ |
92 | /* A hash table used to hold section content. */ |
93 | struct sec_merge_hash *htab; | |
94 | /* First string in this section. */ | |
95 | struct sec_merge_hash_entry *first; | |
96 | /* Original section content. */ | |
97 | unsigned char contents[1]; | |
98 | }; | |
99 | ||
100 | static struct bfd_hash_entry *sec_merge_hash_newfunc | |
101 | PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); | |
102 | static struct sec_merge_hash_entry *sec_merge_hash_lookup | |
a531bbd2 | 103 | PARAMS ((struct sec_merge_hash *, const char *, unsigned int, boolean)); |
f5fa8ca2 | 104 | static struct sec_merge_hash *sec_merge_init |
a531bbd2 | 105 | PARAMS ((unsigned int, boolean)); |
f5fa8ca2 | 106 | static struct sec_merge_hash_entry *sec_merge_add |
8550eb6e JJ |
107 | PARAMS ((struct sec_merge_hash *, const char *, unsigned int, |
108 | struct sec_merge_sec_info *)); | |
f5fa8ca2 | 109 | static boolean sec_merge_emit |
a531bbd2 | 110 | PARAMS ((bfd *, struct sec_merge_hash_entry *)); |
a7b97311 AM |
111 | static int cmplengthentry PARAMS ((const PTR, const PTR)); |
112 | static int last4_eq PARAMS ((const PTR, const PTR)); | |
113 | static int last_eq PARAMS ((const PTR, const PTR)); | |
114 | static boolean record_section | |
115 | PARAMS ((struct sec_merge_info *, struct sec_merge_sec_info *)); | |
116 | static void merge_strings PARAMS ((struct sec_merge_info *)); | |
f5fa8ca2 JJ |
117 | |
118 | /* Routine to create an entry in a section merge hashtab. */ | |
119 | ||
120 | static struct bfd_hash_entry * | |
121 | sec_merge_hash_newfunc (entry, table, string) | |
122 | struct bfd_hash_entry *entry; | |
123 | struct bfd_hash_table *table; | |
124 | const char *string; | |
125 | { | |
126 | struct sec_merge_hash_entry *ret = (struct sec_merge_hash_entry *) entry; | |
127 | ||
128 | /* Allocate the structure if it has not already been allocated by a | |
129 | subclass. */ | |
130 | if (ret == (struct sec_merge_hash_entry *) NULL) | |
131 | ret = ((struct sec_merge_hash_entry *) | |
132 | bfd_hash_allocate (table, sizeof (struct sec_merge_hash_entry))); | |
133 | if (ret == (struct sec_merge_hash_entry *) NULL) | |
134 | return NULL; | |
135 | ||
136 | /* Call the allocation method of the superclass. */ | |
137 | ret = ((struct sec_merge_hash_entry *) | |
138 | bfd_hash_newfunc ((struct bfd_hash_entry *) ret, table, string)); | |
139 | ||
140 | if (ret) | |
141 | { | |
142 | /* Initialize the local fields. */ | |
8550eb6e | 143 | ret->u.suffix = NULL; |
a531bbd2 | 144 | ret->alignment = 0; |
8550eb6e | 145 | ret->secinfo = NULL; |
f5fa8ca2 JJ |
146 | ret->next = NULL; |
147 | } | |
148 | ||
7217313c | 149 | return (struct bfd_hash_entry *) ret; |
f5fa8ca2 JJ |
150 | } |
151 | ||
152 | /* Look up an entry in a section merge hash table. */ | |
153 | ||
154 | static struct sec_merge_hash_entry * | |
a531bbd2 | 155 | sec_merge_hash_lookup (table, string, alignment, create) |
f5fa8ca2 JJ |
156 | struct sec_merge_hash *table; |
157 | const char *string; | |
a531bbd2 | 158 | unsigned int alignment; |
f5fa8ca2 JJ |
159 | boolean create; |
160 | { | |
161 | register const unsigned char *s; | |
162 | register unsigned long hash; | |
163 | register unsigned int c; | |
164 | struct sec_merge_hash_entry *hashp; | |
165 | unsigned int len, i; | |
166 | unsigned int index; | |
167 | ||
168 | hash = 0; | |
169 | len = 0; | |
170 | s = (const unsigned char *) string; | |
171 | if (table->strings) | |
172 | { | |
173 | if (table->entsize == 1) | |
174 | { | |
175 | while ((c = *s++) != '\0') | |
176 | { | |
177 | hash += c + (c << 17); | |
178 | hash ^= hash >> 2; | |
179 | ++len; | |
180 | } | |
181 | hash += len + (len << 17); | |
182 | } | |
183 | else | |
184 | { | |
185 | for (;;) | |
186 | { | |
187 | for (i = 0; i < table->entsize; ++i) | |
188 | if (s[i] != '\0') | |
189 | break; | |
190 | if (i == table->entsize) | |
191 | break; | |
192 | for (i = 0; i < table->entsize; ++i) | |
193 | { | |
194 | c = *s++; | |
195 | hash += c + (c << 17); | |
196 | hash ^= hash >> 2; | |
197 | } | |
198 | ++len; | |
199 | } | |
200 | hash += len + (len << 17); | |
201 | len *= table->entsize; | |
202 | } | |
203 | hash ^= hash >> 2; | |
204 | len += table->entsize; | |
dc810e39 | 205 | } |
f5fa8ca2 JJ |
206 | else |
207 | { | |
208 | for (i = 0; i < table->entsize; ++i) | |
209 | { | |
210 | c = *s++; | |
211 | hash += c + (c << 17); | |
212 | hash ^= hash >> 2; | |
213 | } | |
214 | len = table->entsize; | |
215 | } | |
216 | ||
217 | index = hash % table->table.size; | |
218 | for (hashp = (struct sec_merge_hash_entry *) table->table.table[index]; | |
219 | hashp != (struct sec_merge_hash_entry *) NULL; | |
a531bbd2 | 220 | hashp = (struct sec_merge_hash_entry *) hashp->root.next) |
f5fa8ca2 JJ |
221 | { |
222 | if (hashp->root.hash == hash | |
223 | && len == hashp->len | |
224 | && memcmp (hashp->root.string, string, len) == 0) | |
a531bbd2 JJ |
225 | { |
226 | /* If the string we found does not have at least the required | |
8550eb6e | 227 | alignment, we need to insert another copy. */ |
a531bbd2 | 228 | if (hashp->alignment < alignment) |
8550eb6e JJ |
229 | { |
230 | /* Mark the less aligned copy as deleted. */ | |
231 | hashp->len = 0; | |
232 | hashp->alignment = 0; | |
233 | break; | |
234 | } | |
a531bbd2 JJ |
235 | return hashp; |
236 | } | |
f5fa8ca2 JJ |
237 | } |
238 | ||
239 | if (! create) | |
240 | return (struct sec_merge_hash_entry *) NULL; | |
241 | ||
242 | hashp = (struct sec_merge_hash_entry *) | |
243 | sec_merge_hash_newfunc ((struct bfd_hash_entry *) NULL, | |
244 | (struct bfd_hash_table *) table, string); | |
245 | if (hashp == (struct sec_merge_hash_entry *) NULL) | |
246 | return (struct sec_merge_hash_entry *) NULL; | |
247 | hashp->root.string = string; | |
248 | hashp->root.hash = hash; | |
249 | hashp->len = len; | |
a531bbd2 | 250 | hashp->alignment = alignment; |
f5fa8ca2 JJ |
251 | hashp->root.next = table->table.table[index]; |
252 | table->table.table[index] = (struct bfd_hash_entry *) hashp; | |
253 | ||
254 | return hashp; | |
255 | } | |
256 | ||
257 | /* Create a new hash table. */ | |
258 | ||
259 | static struct sec_merge_hash * | |
a531bbd2 JJ |
260 | sec_merge_init (entsize, strings) |
261 | unsigned int entsize; | |
f5fa8ca2 JJ |
262 | boolean strings; |
263 | { | |
264 | struct sec_merge_hash *table; | |
dc810e39 | 265 | bfd_size_type amt = sizeof (struct sec_merge_hash); |
f5fa8ca2 | 266 | |
dc810e39 | 267 | table = (struct sec_merge_hash *) bfd_malloc (amt); |
f5fa8ca2 JJ |
268 | if (table == NULL) |
269 | return NULL; | |
270 | ||
271 | if (! bfd_hash_table_init (&table->table, sec_merge_hash_newfunc)) | |
272 | { | |
273 | free (table); | |
274 | return NULL; | |
275 | } | |
276 | ||
277 | table->size = 0; | |
278 | table->first = NULL; | |
279 | table->last = NULL; | |
f5fa8ca2 JJ |
280 | table->entsize = entsize; |
281 | table->strings = strings; | |
282 | ||
283 | return table; | |
284 | } | |
285 | ||
286 | /* Get the index of an entity in a hash table, adding it if it is not | |
287 | already present. */ | |
288 | ||
289 | static struct sec_merge_hash_entry * | |
8550eb6e | 290 | sec_merge_add (tab, str, alignment, secinfo) |
f5fa8ca2 JJ |
291 | struct sec_merge_hash *tab; |
292 | const char *str; | |
a531bbd2 | 293 | unsigned int alignment; |
8550eb6e | 294 | struct sec_merge_sec_info *secinfo; |
f5fa8ca2 JJ |
295 | { |
296 | register struct sec_merge_hash_entry *entry; | |
297 | ||
a531bbd2 | 298 | entry = sec_merge_hash_lookup (tab, str, alignment, true); |
f5fa8ca2 JJ |
299 | if (entry == NULL) |
300 | return NULL; | |
301 | ||
8550eb6e | 302 | if (entry->secinfo == NULL) |
f5fa8ca2 | 303 | { |
8550eb6e JJ |
304 | tab->size++; |
305 | entry->secinfo = secinfo; | |
f5fa8ca2 JJ |
306 | if (tab->first == NULL) |
307 | tab->first = entry; | |
308 | else | |
309 | tab->last->next = entry; | |
310 | tab->last = entry; | |
311 | } | |
312 | ||
313 | return entry; | |
314 | } | |
315 | ||
316 | static boolean | |
a531bbd2 | 317 | sec_merge_emit (abfd, entry) |
f5fa8ca2 | 318 | register bfd *abfd; |
f5fa8ca2 JJ |
319 | struct sec_merge_hash_entry *entry; |
320 | { | |
8550eb6e JJ |
321 | struct sec_merge_sec_info *secinfo = entry->secinfo; |
322 | asection *sec = secinfo->sec; | |
f5fa8ca2 | 323 | char *pad = ""; |
a531bbd2 JJ |
324 | bfd_size_type off = 0; |
325 | int alignment_power = bfd_get_section_alignment (abfd, sec->output_section); | |
f5fa8ca2 | 326 | |
a531bbd2 | 327 | if (alignment_power) |
dc810e39 | 328 | pad = bfd_zmalloc ((bfd_size_type) 1 << alignment_power); |
f5fa8ca2 | 329 | |
8550eb6e | 330 | for (; entry != NULL && entry->secinfo == secinfo; entry = entry->next) |
f5fa8ca2 JJ |
331 | { |
332 | register const char *str; | |
333 | register size_t len; | |
334 | ||
a531bbd2 JJ |
335 | len = off & (entry->alignment - 1); |
336 | if (len) | |
337 | { | |
338 | len = entry->alignment - len; | |
dc810e39 | 339 | if (bfd_bwrite ((PTR) pad, (bfd_size_type) len, abfd) != len) |
a531bbd2 JJ |
340 | break; |
341 | off += len; | |
342 | } | |
343 | ||
f5fa8ca2 JJ |
344 | str = entry->root.string; |
345 | len = entry->len; | |
346 | ||
dc810e39 | 347 | if (bfd_bwrite ((PTR) str, (bfd_size_type) len, abfd) != len) |
f5fa8ca2 JJ |
348 | break; |
349 | ||
a531bbd2 | 350 | off += len; |
f5fa8ca2 JJ |
351 | } |
352 | ||
a531bbd2 | 353 | if (alignment_power) |
f5fa8ca2 JJ |
354 | free (pad); |
355 | ||
8550eb6e | 356 | return entry == NULL || entry->secinfo != secinfo; |
f5fa8ca2 JJ |
357 | } |
358 | ||
359 | /* This function is called for each input file from the add_symbols | |
360 | pass of the linker. */ | |
361 | ||
362 | boolean | |
363 | _bfd_merge_section (abfd, psinfo, sec, psecinfo) | |
364 | bfd *abfd; | |
365 | PTR *psinfo; | |
366 | asection *sec; | |
367 | PTR *psecinfo; | |
368 | { | |
f5fa8ca2 JJ |
369 | struct sec_merge_info *sinfo; |
370 | struct sec_merge_sec_info *secinfo; | |
f5fa8ca2 | 371 | unsigned int align; |
dc810e39 | 372 | bfd_size_type amt; |
f5fa8ca2 JJ |
373 | |
374 | if (sec->_raw_size == 0 | |
8550eb6e | 375 | || (sec->flags & SEC_EXCLUDE) |
f5fa8ca2 JJ |
376 | || (sec->flags & SEC_MERGE) == 0 |
377 | || sec->entsize == 0) | |
378 | return true; | |
379 | ||
380 | if ((sec->flags & SEC_RELOC) != 0) | |
381 | { | |
382 | /* We aren't prepared to handle relocations in merged sections. */ | |
383 | return true; | |
384 | } | |
385 | ||
386 | if (sec->output_section != NULL | |
387 | && bfd_is_abs_section (sec->output_section)) | |
388 | { | |
389 | /* The section is being discarded from the link, so we should | |
390 | just ignore it. */ | |
391 | return true; | |
392 | } | |
393 | ||
8550eb6e | 394 | align = bfd_get_section_alignment (sec->owner, sec); |
a531bbd2 JJ |
395 | if ((sec->entsize < (unsigned int)(1 << align) |
396 | && ((sec->entsize & (sec->entsize - 1)) | |
397 | || !(sec->flags & SEC_STRINGS))) | |
398 | || (sec->entsize > (unsigned int)(1 << align) | |
399 | && (sec->entsize & ((1 << align) - 1)))) | |
f5fa8ca2 JJ |
400 | { |
401 | /* Sanity check. If string character size is smaller than | |
402 | alignment, then we require character size to be a power | |
403 | of 2, otherwise character size must be integer multiple | |
a531bbd2 JJ |
404 | of alignment. For non-string constants, alignment must |
405 | be smaller than or equal to entity size and entity size | |
406 | must be integer multiple of alignment. */ | |
f5fa8ca2 JJ |
407 | return true; |
408 | } | |
409 | ||
f5fa8ca2 | 410 | for (sinfo = (struct sec_merge_info *) *psinfo; sinfo; sinfo = sinfo->next) |
8550eb6e JJ |
411 | if ((secinfo = sinfo->chain) |
412 | && ! ((secinfo->sec->flags ^ sec->flags) & (SEC_MERGE | SEC_STRINGS)) | |
413 | && secinfo->sec->entsize == sec->entsize | |
414 | && ! strcmp (secinfo->sec->name, sec->name)) | |
f5fa8ca2 JJ |
415 | break; |
416 | ||
417 | if (sinfo == NULL) | |
418 | { | |
419 | /* Initialize the information we need to keep track of. */ | |
f5fa8ca2 | 420 | sinfo = (struct sec_merge_info *) |
dc810e39 | 421 | bfd_alloc (abfd, (bfd_size_type) sizeof (struct sec_merge_info)); |
f5fa8ca2 JJ |
422 | if (sinfo == NULL) |
423 | goto error_return; | |
424 | sinfo->next = (struct sec_merge_info *) *psinfo; | |
8550eb6e | 425 | sinfo->chain = NULL; |
f5fa8ca2 JJ |
426 | *psinfo = (PTR) sinfo; |
427 | sinfo->htab = | |
a531bbd2 | 428 | sec_merge_init (sec->entsize, (sec->flags & SEC_STRINGS)); |
f5fa8ca2 JJ |
429 | if (sinfo->htab == NULL) |
430 | goto error_return; | |
431 | } | |
432 | ||
433 | /* Read the section from abfd. */ | |
434 | ||
dc810e39 AM |
435 | amt = sizeof (struct sec_merge_sec_info) + sec->_raw_size - 1; |
436 | *psecinfo = bfd_alloc (abfd, amt); | |
f5fa8ca2 JJ |
437 | if (*psecinfo == NULL) |
438 | goto error_return; | |
439 | ||
440 | secinfo = (struct sec_merge_sec_info *)*psecinfo; | |
8550eb6e JJ |
441 | if (sinfo->chain) |
442 | { | |
443 | secinfo->next = sinfo->chain->next; | |
444 | sinfo->chain->next = secinfo; | |
445 | } | |
446 | else | |
447 | secinfo->next = secinfo; | |
448 | sinfo->chain = secinfo; | |
449 | secinfo->sec = sec; | |
450 | secinfo->psecinfo = psecinfo; | |
f5fa8ca2 | 451 | secinfo->htab = sinfo->htab; |
f5fa8ca2 JJ |
452 | secinfo->first = NULL; |
453 | ||
dc810e39 AM |
454 | if (! bfd_get_section_contents (sec->owner, sec, secinfo->contents, |
455 | (bfd_vma) 0, sec->_raw_size)) | |
f5fa8ca2 JJ |
456 | goto error_return; |
457 | ||
8550eb6e JJ |
458 | return true; |
459 | ||
460 | error_return: | |
461 | *psecinfo = NULL; | |
462 | return false; | |
463 | } | |
464 | ||
465 | /* Compare two sec_merge_hash_entry structures. This is called via qsort. */ | |
466 | ||
467 | static int | |
468 | cmplengthentry (a, b) | |
469 | const PTR a; | |
470 | const PTR b; | |
471 | { | |
472 | struct sec_merge_hash_entry * A = *(struct sec_merge_hash_entry **) a; | |
473 | struct sec_merge_hash_entry * B = *(struct sec_merge_hash_entry **) b; | |
dc810e39 | 474 | |
8550eb6e JJ |
475 | if (A->len < B->len) |
476 | return 1; | |
477 | else if (A->len > B->len) | |
478 | return -1; | |
479 | ||
480 | return memcmp (A->root.string, B->root.string, A->len); | |
481 | } | |
482 | ||
483 | static int | |
484 | last4_eq (a, b) | |
a7b97311 AM |
485 | const PTR a; |
486 | const PTR b; | |
8550eb6e JJ |
487 | { |
488 | struct sec_merge_hash_entry * A = (struct sec_merge_hash_entry *) a; | |
489 | struct sec_merge_hash_entry * B = (struct sec_merge_hash_entry *) b; | |
490 | ||
491 | if (memcmp (A->root.string + A->len - 5 * A->u.entsize, | |
492 | B->root.string + B->len - 5 * A->u.entsize, | |
493 | 4 * A->u.entsize) != 0) | |
494 | /* This was a hashtable collision. */ | |
495 | return 0; | |
496 | ||
497 | if (A->len <= B->len) | |
498 | /* B cannot be a suffix of A unless A is equal to B, which is guaranteed | |
499 | not to be equal by the hash table. */ | |
500 | return 0; | |
501 | ||
502 | if (A->alignment < B->alignment | |
503 | || ((A->len - B->len) & (B->alignment - 1))) | |
504 | /* The suffix is not sufficiently aligned. */ | |
505 | return 0; | |
506 | ||
507 | return memcmp (A->root.string + (A->len - B->len), | |
508 | B->root.string, B->len - 5 * A->u.entsize) == 0; | |
509 | } | |
510 | ||
511 | static int | |
512 | last_eq (a, b) | |
a7b97311 AM |
513 | const PTR a; |
514 | const PTR b; | |
8550eb6e JJ |
515 | { |
516 | struct sec_merge_hash_entry * A = (struct sec_merge_hash_entry *) a; | |
517 | struct sec_merge_hash_entry * B = (struct sec_merge_hash_entry *) b; | |
518 | ||
519 | if (B->len >= 5 * A->u.entsize) | |
520 | /* Longer strings are just pushed into the hash table, | |
521 | they'll be used when looking up for very short strings. */ | |
522 | return 0; | |
523 | ||
524 | if (memcmp (A->root.string + A->len - 2 * A->u.entsize, | |
525 | B->root.string + B->len - 2 * A->u.entsize, | |
526 | A->u.entsize) != 0) | |
527 | /* This was a hashtable collision. */ | |
528 | return 0; | |
529 | ||
530 | if (A->len <= B->len) | |
531 | /* B cannot be a suffix of A unless A is equal to B, which is guaranteed | |
532 | not to be equal by the hash table. */ | |
533 | return 0; | |
534 | ||
535 | if (A->alignment < B->alignment | |
536 | || ((A->len - B->len) & (B->alignment - 1))) | |
537 | /* The suffix is not sufficiently aligned. */ | |
538 | return 0; | |
539 | ||
540 | return memcmp (A->root.string + (A->len - B->len), | |
541 | B->root.string, B->len - 2 * A->u.entsize) == 0; | |
542 | } | |
543 | ||
544 | /* Record one section into the hash table. */ | |
545 | static boolean | |
546 | record_section (sinfo, secinfo) | |
547 | struct sec_merge_info *sinfo; | |
548 | struct sec_merge_sec_info *secinfo; | |
549 | { | |
550 | asection *sec = secinfo->sec; | |
551 | struct sec_merge_hash_entry *entry; | |
552 | boolean nul; | |
553 | unsigned char *p, *end; | |
554 | bfd_vma mask, eltalign; | |
555 | unsigned int align, i; | |
556 | ||
557 | align = bfd_get_section_alignment (sec->owner, sec); | |
f5fa8ca2 JJ |
558 | end = secinfo->contents + sec->_raw_size; |
559 | nul = false; | |
dc810e39 | 560 | mask = ((bfd_vma) 1 << align) - 1; |
f5fa8ca2 JJ |
561 | if (sec->flags & SEC_STRINGS) |
562 | { | |
dc810e39 | 563 | for (p = secinfo->contents; p < end; ) |
f5fa8ca2 | 564 | { |
a531bbd2 JJ |
565 | eltalign = p - secinfo->contents; |
566 | eltalign = ((eltalign ^ (eltalign - 1)) + 1) >> 1; | |
567 | if (!eltalign || eltalign > mask) | |
568 | eltalign = mask + 1; | |
dc810e39 | 569 | entry = sec_merge_add (sinfo->htab, p, (unsigned) eltalign, secinfo); |
8550eb6e JJ |
570 | if (! entry) |
571 | goto error_return; | |
f5fa8ca2 JJ |
572 | p += entry->len; |
573 | if (sec->entsize == 1) | |
574 | { | |
575 | while (p < end && *p == 0) | |
576 | { | |
577 | if (!nul && !((p - secinfo->contents) & mask)) | |
578 | { | |
579 | nul = true; | |
dc810e39 AM |
580 | entry = sec_merge_add (sinfo->htab, "", |
581 | (unsigned) mask + 1, secinfo); | |
8550eb6e JJ |
582 | if (! entry) |
583 | goto error_return; | |
f5fa8ca2 JJ |
584 | } |
585 | p++; | |
586 | } | |
587 | } | |
588 | else | |
589 | { | |
590 | while (p < end) | |
591 | { | |
592 | for (i = 0; i < sec->entsize; i++) | |
593 | if (p[i] != '\0') | |
594 | break; | |
595 | if (i != sec->entsize) | |
596 | break; | |
597 | if (!nul && !((p - secinfo->contents) & mask)) | |
598 | { | |
599 | nul = true; | |
dc810e39 AM |
600 | entry = sec_merge_add (sinfo->htab, p, |
601 | (unsigned) mask + 1, secinfo); | |
8550eb6e JJ |
602 | if (! entry) |
603 | goto error_return; | |
f5fa8ca2 JJ |
604 | } |
605 | p += sec->entsize; | |
606 | } | |
607 | } | |
608 | } | |
609 | } | |
610 | else | |
611 | { | |
612 | for (p = secinfo->contents; p < end; p += sec->entsize) | |
613 | { | |
8550eb6e JJ |
614 | entry = sec_merge_add (sinfo->htab, p, 1, secinfo); |
615 | if (! entry) | |
616 | goto error_return; | |
617 | } | |
618 | } | |
619 | ||
620 | return true; | |
621 | ||
622 | error_return: | |
623 | for (secinfo = sinfo->chain; secinfo; secinfo = secinfo->next) | |
624 | *secinfo->psecinfo = NULL; | |
625 | return false; | |
626 | } | |
627 | ||
628 | /* This is a helper function for _bfd_merge_sections. It attempts to | |
629 | merge strings matching suffixes of longer strings. */ | |
630 | static void | |
631 | merge_strings (sinfo) | |
632 | struct sec_merge_info *sinfo; | |
633 | { | |
634 | struct sec_merge_hash_entry **array, **a, **end, *e; | |
635 | struct sec_merge_sec_info *secinfo; | |
636 | htab_t lasttab = NULL, last4tab = NULL; | |
dc810e39 | 637 | bfd_size_type size, amt; |
8550eb6e JJ |
638 | |
639 | /* Now sort the strings by length, longest first. */ | |
dc810e39 AM |
640 | array = NULL; |
641 | amt = sinfo->htab->size * sizeof (struct sec_merge_hash_entry *); | |
642 | array = (struct sec_merge_hash_entry **) bfd_malloc (amt); | |
8550eb6e JJ |
643 | if (array == NULL) |
644 | goto alloc_failure; | |
645 | ||
646 | for (e = sinfo->htab->first, a = array; e; e = e->next) | |
647 | if (e->alignment) | |
648 | *a++ = e; | |
649 | ||
650 | sinfo->htab->size = a - array; | |
f5fa8ca2 | 651 | |
dc810e39 AM |
652 | qsort (array, (size_t) sinfo->htab->size, |
653 | sizeof (struct sec_merge_hash_entry *), cmplengthentry); | |
8550eb6e | 654 | |
ebe3e2d1 NC |
655 | last4tab = htab_create_alloc ((size_t) sinfo->htab->size * 4, |
656 | NULL, last4_eq, NULL, calloc, free); | |
657 | lasttab = htab_create_alloc ((size_t) sinfo->htab->size * 4, | |
658 | NULL, last_eq, NULL, calloc, free); | |
8550eb6e JJ |
659 | if (lasttab == NULL || last4tab == NULL) |
660 | goto alloc_failure; | |
661 | ||
662 | /* Now insert the strings into hash tables (strings with last 4 characters | |
663 | and strings with last character equal), look for longer strings which | |
664 | we're suffix of. */ | |
665 | for (a = array, end = array + sinfo->htab->size; a < end; a++) | |
666 | { | |
667 | register hashval_t hash; | |
668 | unsigned int c; | |
669 | unsigned int i; | |
670 | const unsigned char *s; | |
671 | PTR *p; | |
672 | ||
673 | e = *a; | |
674 | e->u.entsize = sinfo->htab->entsize; | |
675 | if (e->len <= e->u.entsize) | |
676 | break; | |
677 | if (e->len > 4 * e->u.entsize) | |
678 | { | |
679 | s = e->root.string + e->len - e->u.entsize; | |
680 | hash = 0; | |
681 | for (i = 0; i < 4 * e->u.entsize; i++) | |
f5fa8ca2 | 682 | { |
8550eb6e JJ |
683 | c = *--s; |
684 | hash += c + (c << 17); | |
685 | hash ^= hash >> 2; | |
686 | } | |
687 | p = htab_find_slot_with_hash (last4tab, e, hash, INSERT); | |
688 | if (p == NULL) | |
689 | goto alloc_failure; | |
690 | if (*p) | |
691 | { | |
692 | struct sec_merge_hash_entry *ent; | |
693 | ||
694 | ent = (struct sec_merge_hash_entry *) *p; | |
695 | e->u.suffix = ent; | |
696 | e->alignment = 0; | |
697 | continue; | |
f5fa8ca2 | 698 | } |
8550eb6e JJ |
699 | else |
700 | *p = (PTR) e; | |
701 | } | |
702 | s = e->root.string + e->len - e->u.entsize; | |
703 | hash = 0; | |
704 | for (i = 0; i < e->u.entsize; i++) | |
705 | { | |
706 | c = *--s; | |
707 | hash += c + (c << 17); | |
708 | hash ^= hash >> 2; | |
709 | } | |
710 | p = htab_find_slot_with_hash (lasttab, e, hash, INSERT); | |
711 | if (p == NULL) | |
712 | goto alloc_failure; | |
713 | if (*p) | |
714 | { | |
715 | struct sec_merge_hash_entry *ent; | |
716 | ||
717 | ent = (struct sec_merge_hash_entry *) *p; | |
718 | e->u.suffix = ent; | |
719 | e->alignment = 0; | |
f5fa8ca2 | 720 | } |
8550eb6e JJ |
721 | else |
722 | *p = (PTR) e; | |
f5fa8ca2 JJ |
723 | } |
724 | ||
8550eb6e JJ |
725 | alloc_failure: |
726 | if (array) | |
727 | free (array); | |
728 | if (lasttab) | |
729 | htab_delete (lasttab); | |
730 | if (last4tab) | |
731 | htab_delete (last4tab); | |
732 | ||
733 | /* Now assign positions to the strings we want to keep. */ | |
734 | size = 0; | |
735 | secinfo = sinfo->htab->first->secinfo; | |
736 | for (e = sinfo->htab->first; e; e = e->next) | |
737 | { | |
738 | if (e->secinfo != secinfo) | |
739 | { | |
740 | secinfo->sec->_cooked_size = size; | |
741 | secinfo = e->secinfo; | |
742 | } | |
743 | if (e->alignment) | |
744 | { | |
745 | if (e->secinfo->first == NULL) | |
746 | { | |
747 | e->secinfo->first = e; | |
748 | size = 0; | |
749 | } | |
750 | size = (size + e->alignment - 1) & ~((bfd_vma) e->alignment - 1); | |
751 | e->u.index = size; | |
752 | size += e->len; | |
753 | } | |
754 | } | |
755 | secinfo->sec->_cooked_size = size; | |
756 | ||
757 | /* And now adjust the rest, removing them from the chain (but not hashtable) | |
758 | at the same time. */ | |
759 | for (a = &sinfo->htab->first, e = *a; e; e = e->next) | |
760 | if (e->alignment) | |
761 | a = &e->next; | |
762 | else | |
763 | { | |
764 | *a = e->next; | |
765 | if (e->len) | |
766 | { | |
767 | e->secinfo = e->u.suffix->secinfo; | |
768 | e->alignment = e->u.suffix->alignment; | |
769 | e->u.index = e->u.suffix->u.index + (e->u.suffix->len - e->len); | |
770 | } | |
771 | } | |
772 | } | |
f5fa8ca2 | 773 | |
8550eb6e JJ |
774 | /* This function is called once after all SEC_MERGE sections are registered |
775 | with _bfd_merge_section. */ | |
776 | ||
777 | boolean | |
d3c456e9 | 778 | _bfd_merge_sections (abfd, xsinfo, remove_hook) |
8550eb6e JJ |
779 | bfd *abfd ATTRIBUTE_UNUSED; |
780 | PTR xsinfo; | |
d3c456e9 | 781 | void (*remove_hook) PARAMS((bfd *, asection *)); |
8550eb6e JJ |
782 | { |
783 | struct sec_merge_info *sinfo; | |
784 | ||
785 | for (sinfo = (struct sec_merge_info *) xsinfo; sinfo; sinfo = sinfo->next) | |
786 | { | |
787 | struct sec_merge_sec_info * secinfo; | |
788 | ||
789 | if (! sinfo->chain) | |
790 | continue; | |
791 | ||
792 | /* Move sinfo->chain to head of the chain, terminate it. */ | |
793 | secinfo = sinfo->chain; | |
794 | sinfo->chain = secinfo->next; | |
795 | secinfo->next = NULL; | |
796 | ||
797 | /* Record the sections into the hash table. */ | |
798 | for (secinfo = sinfo->chain; secinfo; secinfo = secinfo->next) | |
799 | if (secinfo->sec->flags & SEC_EXCLUDE) | |
d3c456e9 JJ |
800 | { |
801 | *secinfo->psecinfo = NULL; | |
802 | if (remove_hook) | |
803 | (*remove_hook) (abfd, secinfo->sec); | |
804 | } | |
8550eb6e JJ |
805 | else if (! record_section (sinfo, secinfo)) |
806 | break; | |
807 | ||
808 | if (secinfo) | |
809 | continue; | |
810 | ||
86eaf01e JJ |
811 | if (sinfo->htab->first == NULL) |
812 | continue; | |
813 | ||
8550eb6e JJ |
814 | if (sinfo->htab->strings) |
815 | merge_strings (sinfo); | |
816 | else | |
817 | { | |
818 | struct sec_merge_hash_entry *e; | |
819 | bfd_size_type size = 0; | |
820 | ||
821 | /* Things are much simpler for non-strings. | |
822 | Just assign them slots in the section. */ | |
823 | secinfo = NULL; | |
824 | for (e = sinfo->htab->first; e; e = e->next) | |
825 | { | |
826 | if (e->secinfo->first == NULL) | |
827 | { | |
828 | if (secinfo) | |
829 | secinfo->sec->_cooked_size = size; | |
830 | e->secinfo->first = e; | |
831 | size = 0; | |
832 | } | |
833 | size = (size + e->alignment - 1) | |
834 | & ~((bfd_vma) e->alignment - 1); | |
835 | e->u.index = size; | |
836 | size += e->len; | |
837 | secinfo = e->secinfo; | |
838 | } | |
839 | secinfo->sec->_cooked_size = size; | |
840 | } | |
841 | ||
842 | /* Finally shrink all input sections which have not made it into | |
843 | the hash table at all. */ | |
844 | for (secinfo = sinfo->chain; secinfo; secinfo = secinfo->next) | |
845 | if (secinfo->first == NULL) | |
846 | { | |
847 | secinfo->sec->_cooked_size = 0; | |
848 | secinfo->sec->flags |= SEC_EXCLUDE; | |
849 | } | |
850 | } | |
851 | ||
852 | return true; | |
f5fa8ca2 JJ |
853 | } |
854 | ||
855 | /* Write out the merged section. */ | |
856 | ||
857 | boolean | |
858 | _bfd_write_merged_section (output_bfd, sec, psecinfo) | |
859 | bfd *output_bfd; | |
860 | asection *sec; | |
861 | PTR psecinfo; | |
862 | { | |
863 | struct sec_merge_sec_info *secinfo; | |
dc810e39 | 864 | file_ptr pos; |
f5fa8ca2 JJ |
865 | |
866 | secinfo = (struct sec_merge_sec_info *) psecinfo; | |
867 | ||
868 | if (!secinfo->first) | |
869 | return true; | |
870 | ||
dc810e39 AM |
871 | pos = sec->output_section->filepos + sec->output_offset; |
872 | if (bfd_seek (output_bfd, pos, SEEK_SET) != 0) | |
f5fa8ca2 JJ |
873 | return false; |
874 | ||
a531bbd2 | 875 | if (! sec_merge_emit (output_bfd, secinfo->first)) |
f5fa8ca2 JJ |
876 | return false; |
877 | ||
878 | return true; | |
879 | } | |
880 | ||
881 | /* Adjust an address in the SEC_MERGE section. Given OFFSET within | |
882 | *PSEC, this returns the new offset in the adjusted SEC_MERGE | |
883 | section and writes the new section back into *PSEC. */ | |
884 | ||
885 | bfd_vma | |
886 | _bfd_merged_section_offset (output_bfd, psec, psecinfo, offset, addend) | |
887 | bfd *output_bfd ATTRIBUTE_UNUSED; | |
888 | asection **psec; | |
889 | PTR psecinfo; | |
890 | bfd_vma offset, addend; | |
891 | { | |
892 | struct sec_merge_sec_info *secinfo; | |
893 | struct sec_merge_hash_entry *entry; | |
894 | unsigned char *p; | |
895 | asection *sec = *psec; | |
896 | ||
897 | secinfo = (struct sec_merge_sec_info *) psecinfo; | |
898 | ||
899 | if (offset + addend >= sec->_raw_size) | |
900 | { | |
901 | if (offset + addend > sec->_raw_size) | |
923f08ff AM |
902 | { |
903 | (*_bfd_error_handler) | |
904 | (_("%s: access beyond end of merged section (%ld + %ld)"), | |
905 | bfd_get_filename (sec->owner), (long) offset, (long) addend); | |
906 | } | |
f5fa8ca2 JJ |
907 | return (secinfo->first ? sec->_cooked_size : 0); |
908 | } | |
909 | ||
910 | if (secinfo->htab->strings) | |
911 | { | |
912 | if (sec->entsize == 1) | |
913 | { | |
914 | p = secinfo->contents + offset + addend - 1; | |
915 | while (*p && p >= secinfo->contents) | |
916 | --p; | |
917 | ++p; | |
918 | } | |
919 | else | |
920 | { | |
921 | p = secinfo->contents | |
922 | + ((offset + addend) / sec->entsize) * sec->entsize; | |
923 | p -= sec->entsize; | |
924 | while (p >= secinfo->contents) | |
925 | { | |
926 | unsigned int i; | |
927 | ||
928 | for (i = 0; i < sec->entsize; ++i) | |
929 | if (p[i] != '\0') | |
930 | break; | |
931 | if (i == sec->entsize) | |
932 | break; | |
933 | p -= sec->entsize; | |
934 | } | |
935 | p += sec->entsize; | |
936 | } | |
937 | } | |
938 | else | |
939 | { | |
940 | p = secinfo->contents | |
941 | + ((offset + addend) / sec->entsize) * sec->entsize; | |
942 | } | |
a531bbd2 | 943 | entry = sec_merge_hash_lookup (secinfo->htab, p, 0, false); |
f5fa8ca2 JJ |
944 | if (!entry) |
945 | { | |
946 | if (! secinfo->htab->strings) | |
947 | abort (); | |
948 | /* This should only happen if somebody points into the padding | |
949 | after a NUL character but before next entity. */ | |
950 | if (*p) | |
951 | abort (); | |
952 | if (! secinfo->htab->first) | |
953 | abort (); | |
954 | entry = secinfo->htab->first; | |
955 | p = secinfo->contents | |
956 | + ((offset + addend) / sec->entsize + 1) * sec->entsize | |
957 | - entry->len; | |
958 | } | |
959 | ||
8550eb6e JJ |
960 | *psec = entry->secinfo->sec; |
961 | return entry->u.index + (secinfo->contents + offset - p); | |
f5fa8ca2 | 962 | } |