merge from gcc
[binutils.git] / bfd / merge.c
blobde1e9510819577628538e4ebfa856e021eaa199c
1 /* SEC_MERGE support.
2 Copyright 2001, 2002, 2003, 2004, 2005, 2006, 2007
3 Free Software Foundation, Inc.
4 Written by Jakub Jelinek <jakub@redhat.com>.
6 This file is part of BFD, the Binary File Descriptor library.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
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.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 MA 02110-1301, USA. */
24 /* This file contains support for merging duplicate entities within sections,
25 as used in ELF SHF_MERGE. */
27 #include "sysdep.h"
28 #include "bfd.h"
29 #include "libbfd.h"
30 #include "hashtab.h"
31 #include "libiberty.h"
33 struct sec_merge_sec_info;
35 /* An entry in the section merge hash table. */
37 struct sec_merge_hash_entry
39 struct bfd_hash_entry root;
40 /* Length of this entry. This includes the zero terminator. */
41 unsigned int len;
42 /* Start of this string needs to be aligned to
43 alignment octets (not 1 << align). */
44 unsigned int alignment;
45 union
47 /* Index within the merged section. */
48 bfd_size_type index;
49 /* Entry this is a suffix of (if alignment is 0). */
50 struct sec_merge_hash_entry *suffix;
51 } u;
52 /* Which section is it in. */
53 struct sec_merge_sec_info *secinfo;
54 /* Next entity in the hash table. */
55 struct sec_merge_hash_entry *next;
58 /* The section merge hash table. */
60 struct sec_merge_hash
62 struct bfd_hash_table table;
63 /* Next available index. */
64 bfd_size_type size;
65 /* First entity in the SEC_MERGE sections of this type. */
66 struct sec_merge_hash_entry *first;
67 /* Last entity in the SEC_MERGE sections of this type. */
68 struct sec_merge_hash_entry *last;
69 /* Entity size. */
70 unsigned int entsize;
71 /* Are entries fixed size or zero terminated strings? */
72 bfd_boolean strings;
75 struct sec_merge_info
77 /* Chain of sec_merge_infos. */
78 struct sec_merge_info *next;
79 /* Chain of sec_merge_sec_infos. */
80 struct sec_merge_sec_info *chain;
81 /* A hash table used to hold section content. */
82 struct sec_merge_hash *htab;
85 struct sec_merge_sec_info
87 /* Chain of sec_merge_sec_infos. */
88 struct sec_merge_sec_info *next;
89 /* The corresponding section. */
90 asection *sec;
91 /* Pointer to merge_info pointing to us. */
92 void **psecinfo;
93 /* A hash table used to hold section content. */
94 struct sec_merge_hash *htab;
95 /* First string in this section. */
96 struct sec_merge_hash_entry *first_str;
97 /* Original section content. */
98 unsigned char contents[1];
102 /* Routine to create an entry in a section merge hashtab. */
104 static struct bfd_hash_entry *
105 sec_merge_hash_newfunc (struct bfd_hash_entry *entry,
106 struct bfd_hash_table *table, const char *string)
108 /* Allocate the structure if it has not already been allocated by a
109 subclass. */
110 if (entry == NULL)
111 entry = bfd_hash_allocate (table, sizeof (struct sec_merge_hash_entry));
112 if (entry == NULL)
113 return NULL;
115 /* Call the allocation method of the superclass. */
116 entry = bfd_hash_newfunc (entry, table, string);
118 if (entry != NULL)
120 /* Initialize the local fields. */
121 struct sec_merge_hash_entry *ret = (struct sec_merge_hash_entry *) entry;
123 ret->u.suffix = NULL;
124 ret->alignment = 0;
125 ret->secinfo = NULL;
126 ret->next = NULL;
129 return entry;
132 /* Look up an entry in a section merge hash table. */
134 static struct sec_merge_hash_entry *
135 sec_merge_hash_lookup (struct sec_merge_hash *table, const char *string,
136 unsigned int alignment, bfd_boolean create)
138 register const unsigned char *s;
139 register unsigned long hash;
140 register unsigned int c;
141 struct sec_merge_hash_entry *hashp;
142 unsigned int len, i;
143 unsigned int index;
145 hash = 0;
146 len = 0;
147 s = (const unsigned char *) string;
148 if (table->strings)
150 if (table->entsize == 1)
152 while ((c = *s++) != '\0')
154 hash += c + (c << 17);
155 hash ^= hash >> 2;
156 ++len;
158 hash += len + (len << 17);
160 else
162 for (;;)
164 for (i = 0; i < table->entsize; ++i)
165 if (s[i] != '\0')
166 break;
167 if (i == table->entsize)
168 break;
169 for (i = 0; i < table->entsize; ++i)
171 c = *s++;
172 hash += c + (c << 17);
173 hash ^= hash >> 2;
175 ++len;
177 hash += len + (len << 17);
178 len *= table->entsize;
180 hash ^= hash >> 2;
181 len += table->entsize;
183 else
185 for (i = 0; i < table->entsize; ++i)
187 c = *s++;
188 hash += c + (c << 17);
189 hash ^= hash >> 2;
191 len = table->entsize;
194 index = hash % table->table.size;
195 for (hashp = (struct sec_merge_hash_entry *) table->table.table[index];
196 hashp != NULL;
197 hashp = (struct sec_merge_hash_entry *) hashp->root.next)
199 if (hashp->root.hash == hash
200 && len == hashp->len
201 && memcmp (hashp->root.string, string, len) == 0)
203 /* If the string we found does not have at least the required
204 alignment, we need to insert another copy. */
205 if (hashp->alignment < alignment)
207 if (create)
209 /* Mark the less aligned copy as deleted. */
210 hashp->len = 0;
211 hashp->alignment = 0;
213 break;
215 return hashp;
219 if (! create)
220 return NULL;
222 hashp = ((struct sec_merge_hash_entry *)
223 bfd_hash_insert (&table->table, string, hash));
224 if (hashp == NULL)
225 return NULL;
226 hashp->len = len;
227 hashp->alignment = alignment;
228 return hashp;
231 /* Create a new hash table. */
233 static struct sec_merge_hash *
234 sec_merge_init (unsigned int entsize, bfd_boolean strings)
236 struct sec_merge_hash *table;
238 table = bfd_malloc (sizeof (struct sec_merge_hash));
239 if (table == NULL)
240 return NULL;
242 if (! bfd_hash_table_init_n (&table->table, sec_merge_hash_newfunc,
243 sizeof (struct sec_merge_hash_entry), 16699))
245 free (table);
246 return NULL;
249 table->size = 0;
250 table->first = NULL;
251 table->last = NULL;
252 table->entsize = entsize;
253 table->strings = strings;
255 return table;
258 /* Get the index of an entity in a hash table, adding it if it is not
259 already present. */
261 static struct sec_merge_hash_entry *
262 sec_merge_add (struct sec_merge_hash *tab, const char *str,
263 unsigned int alignment, struct sec_merge_sec_info *secinfo)
265 register struct sec_merge_hash_entry *entry;
267 entry = sec_merge_hash_lookup (tab, str, alignment, TRUE);
268 if (entry == NULL)
269 return NULL;
271 if (entry->secinfo == NULL)
273 tab->size++;
274 entry->secinfo = secinfo;
275 if (tab->first == NULL)
276 tab->first = entry;
277 else
278 tab->last->next = entry;
279 tab->last = entry;
282 return entry;
285 static bfd_boolean
286 sec_merge_emit (bfd *abfd, struct sec_merge_hash_entry *entry)
288 struct sec_merge_sec_info *secinfo = entry->secinfo;
289 asection *sec = secinfo->sec;
290 char *pad = NULL;
291 bfd_size_type off = 0;
292 int alignment_power = sec->output_section->alignment_power;
294 if (alignment_power)
296 pad = bfd_zmalloc ((bfd_size_type) 1 << alignment_power);
297 if (pad == NULL)
298 return FALSE;
301 for (; entry != NULL && entry->secinfo == secinfo; entry = entry->next)
303 const char *str;
304 bfd_size_type len;
306 len = -off & (entry->alignment - 1);
307 if (len != 0)
309 if (bfd_bwrite (pad, len, abfd) != len)
310 goto err;
311 off += len;
314 str = entry->root.string;
315 len = entry->len;
317 if (bfd_bwrite (str, len, abfd) != len)
318 goto err;
320 off += len;
323 /* Trailing alignment needed? */
324 off = sec->size - off;
325 if (off != 0
326 && bfd_bwrite (pad, off, abfd) != off)
327 goto err;
329 if (pad != NULL)
330 free (pad);
331 return TRUE;
333 err:
334 if (pad != NULL)
335 free (pad);
336 return FALSE;
339 /* Register a SEC_MERGE section as a candidate for merging.
340 This function is called for all non-dynamic SEC_MERGE input sections. */
342 bfd_boolean
343 _bfd_add_merge_section (bfd *abfd, void **psinfo, asection *sec,
344 void **psecinfo)
346 struct sec_merge_info *sinfo;
347 struct sec_merge_sec_info *secinfo;
348 unsigned int align;
349 bfd_size_type amt;
351 if ((abfd->flags & DYNAMIC) != 0
352 || (sec->flags & SEC_MERGE) == 0)
353 abort ();
355 if (sec->size == 0
356 || (sec->flags & SEC_EXCLUDE) != 0
357 || sec->entsize == 0)
358 return TRUE;
360 if ((sec->flags & SEC_RELOC) != 0)
362 /* We aren't prepared to handle relocations in merged sections. */
363 return TRUE;
366 align = sec->alignment_power;
367 if ((sec->entsize < (unsigned) 1 << align
368 && ((sec->entsize & (sec->entsize - 1))
369 || !(sec->flags & SEC_STRINGS)))
370 || (sec->entsize > (unsigned) 1 << align
371 && (sec->entsize & (((unsigned) 1 << align) - 1))))
373 /* Sanity check. If string character size is smaller than
374 alignment, then we require character size to be a power
375 of 2, otherwise character size must be integer multiple
376 of alignment. For non-string constants, alignment must
377 be smaller than or equal to entity size and entity size
378 must be integer multiple of alignment. */
379 return TRUE;
382 for (sinfo = (struct sec_merge_info *) *psinfo; sinfo; sinfo = sinfo->next)
383 if ((secinfo = sinfo->chain)
384 && ! ((secinfo->sec->flags ^ sec->flags) & (SEC_MERGE | SEC_STRINGS))
385 && secinfo->sec->entsize == sec->entsize
386 && secinfo->sec->alignment_power == sec->alignment_power
387 && secinfo->sec->output_section == sec->output_section)
388 break;
390 if (sinfo == NULL)
392 /* Initialize the information we need to keep track of. */
393 sinfo = bfd_alloc (abfd, sizeof (struct sec_merge_info));
394 if (sinfo == NULL)
395 goto error_return;
396 sinfo->next = (struct sec_merge_info *) *psinfo;
397 sinfo->chain = NULL;
398 *psinfo = sinfo;
399 sinfo->htab = sec_merge_init (sec->entsize, (sec->flags & SEC_STRINGS));
400 if (sinfo->htab == NULL)
401 goto error_return;
404 /* Read the section from abfd. */
406 amt = sizeof (struct sec_merge_sec_info) - 1 + sec->size;
407 if (sec->flags & SEC_STRINGS)
408 /* Some versions of gcc may emit a string without a zero terminator.
409 See http://gcc.gnu.org/ml/gcc-patches/2006-06/msg01004.html
410 Allocate space for an extra zero. */
411 amt += sec->entsize;
412 *psecinfo = bfd_alloc (abfd, amt);
413 if (*psecinfo == NULL)
414 goto error_return;
416 secinfo = (struct sec_merge_sec_info *) *psecinfo;
417 if (sinfo->chain)
419 secinfo->next = sinfo->chain->next;
420 sinfo->chain->next = secinfo;
422 else
423 secinfo->next = secinfo;
424 sinfo->chain = secinfo;
425 secinfo->sec = sec;
426 secinfo->psecinfo = psecinfo;
427 secinfo->htab = sinfo->htab;
428 secinfo->first_str = NULL;
430 sec->rawsize = sec->size;
431 if (sec->flags & SEC_STRINGS)
432 memset (secinfo->contents + sec->size, 0, sec->entsize);
433 if (! bfd_get_section_contents (sec->owner, sec, secinfo->contents,
434 0, sec->size))
435 goto error_return;
437 return TRUE;
439 error_return:
440 *psecinfo = NULL;
441 return FALSE;
444 /* Record one section into the hash table. */
445 static bfd_boolean
446 record_section (struct sec_merge_info *sinfo,
447 struct sec_merge_sec_info *secinfo)
449 asection *sec = secinfo->sec;
450 struct sec_merge_hash_entry *entry;
451 bfd_boolean nul;
452 unsigned char *p, *end;
453 bfd_vma mask, eltalign;
454 unsigned int align, i;
456 align = sec->alignment_power;
457 end = secinfo->contents + sec->size;
458 nul = FALSE;
459 mask = ((bfd_vma) 1 << align) - 1;
460 if (sec->flags & SEC_STRINGS)
462 for (p = secinfo->contents; p < end; )
464 eltalign = p - secinfo->contents;
465 eltalign = ((eltalign ^ (eltalign - 1)) + 1) >> 1;
466 if (!eltalign || eltalign > mask)
467 eltalign = mask + 1;
468 entry = sec_merge_add (sinfo->htab, (char *) p, (unsigned) eltalign,
469 secinfo);
470 if (! entry)
471 goto error_return;
472 p += entry->len;
473 if (sec->entsize == 1)
475 while (p < end && *p == 0)
477 if (!nul && !((p - secinfo->contents) & mask))
479 nul = TRUE;
480 entry = sec_merge_add (sinfo->htab, "",
481 (unsigned) mask + 1, secinfo);
482 if (! entry)
483 goto error_return;
485 p++;
488 else
490 while (p < end)
492 for (i = 0; i < sec->entsize; i++)
493 if (p[i] != '\0')
494 break;
495 if (i != sec->entsize)
496 break;
497 if (!nul && !((p - secinfo->contents) & mask))
499 nul = TRUE;
500 entry = sec_merge_add (sinfo->htab, (char *) p,
501 (unsigned) mask + 1, secinfo);
502 if (! entry)
503 goto error_return;
505 p += sec->entsize;
510 else
512 for (p = secinfo->contents; p < end; p += sec->entsize)
514 entry = sec_merge_add (sinfo->htab, (char *) p, 1, secinfo);
515 if (! entry)
516 goto error_return;
520 return TRUE;
522 error_return:
523 for (secinfo = sinfo->chain; secinfo; secinfo = secinfo->next)
524 *secinfo->psecinfo = NULL;
525 return FALSE;
528 static int
529 strrevcmp (const void *a, const void *b)
531 struct sec_merge_hash_entry *A = *(struct sec_merge_hash_entry **) a;
532 struct sec_merge_hash_entry *B = *(struct sec_merge_hash_entry **) b;
533 unsigned int lenA = A->len;
534 unsigned int lenB = B->len;
535 const unsigned char *s = (const unsigned char *) A->root.string + lenA - 1;
536 const unsigned char *t = (const unsigned char *) B->root.string + lenB - 1;
537 int l = lenA < lenB ? lenA : lenB;
539 while (l)
541 if (*s != *t)
542 return (int) *s - (int) *t;
543 s--;
544 t--;
545 l--;
547 return lenA - lenB;
550 /* Like strrevcmp, but for the case where all strings have the same
551 alignment > entsize. */
553 static int
554 strrevcmp_align (const void *a, const void *b)
556 struct sec_merge_hash_entry *A = *(struct sec_merge_hash_entry **) a;
557 struct sec_merge_hash_entry *B = *(struct sec_merge_hash_entry **) b;
558 unsigned int lenA = A->len;
559 unsigned int lenB = B->len;
560 const unsigned char *s = (const unsigned char *) A->root.string + lenA - 1;
561 const unsigned char *t = (const unsigned char *) B->root.string + lenB - 1;
562 int l = lenA < lenB ? lenA : lenB;
563 int tail_align = (lenA & (A->alignment - 1)) - (lenB & (A->alignment - 1));
565 if (tail_align != 0)
566 return tail_align;
568 while (l)
570 if (*s != *t)
571 return (int) *s - (int) *t;
572 s--;
573 t--;
574 l--;
576 return lenA - lenB;
579 static inline int
580 is_suffix (const struct sec_merge_hash_entry *A,
581 const struct sec_merge_hash_entry *B)
583 if (A->len <= B->len)
584 /* B cannot be a suffix of A unless A is equal to B, which is guaranteed
585 not to be equal by the hash table. */
586 return 0;
588 return memcmp (A->root.string + (A->len - B->len),
589 B->root.string, B->len) == 0;
592 /* This is a helper function for _bfd_merge_sections. It attempts to
593 merge strings matching suffixes of longer strings. */
594 static void
595 merge_strings (struct sec_merge_info *sinfo)
597 struct sec_merge_hash_entry **array, **a, *e;
598 struct sec_merge_sec_info *secinfo;
599 bfd_size_type size, amt;
600 unsigned int alignment = 0;
602 /* Now sort the strings */
603 amt = sinfo->htab->size * sizeof (struct sec_merge_hash_entry *);
604 array = bfd_malloc (amt);
605 if (array == NULL)
606 goto alloc_failure;
608 for (e = sinfo->htab->first, a = array; e; e = e->next)
609 if (e->alignment)
611 *a++ = e;
612 /* Adjust the length to not include the zero terminator. */
613 e->len -= sinfo->htab->entsize;
614 if (alignment != e->alignment)
616 if (alignment == 0)
617 alignment = e->alignment;
618 else
619 alignment = (unsigned) -1;
623 sinfo->htab->size = a - array;
624 if (sinfo->htab->size != 0)
626 qsort (array, (size_t) sinfo->htab->size,
627 sizeof (struct sec_merge_hash_entry *),
628 (alignment != (unsigned) -1 && alignment > sinfo->htab->entsize
629 ? strrevcmp_align : strrevcmp));
631 /* Loop over the sorted array and merge suffixes */
632 e = *--a;
633 e->len += sinfo->htab->entsize;
634 while (--a >= array)
636 struct sec_merge_hash_entry *cmp = *a;
638 cmp->len += sinfo->htab->entsize;
639 if (e->alignment >= cmp->alignment
640 && !((e->len - cmp->len) & (cmp->alignment - 1))
641 && is_suffix (e, cmp))
643 cmp->u.suffix = e;
644 cmp->alignment = 0;
646 else
647 e = cmp;
651 alloc_failure:
652 if (array)
653 free (array);
655 /* Now assign positions to the strings we want to keep. */
656 size = 0;
657 secinfo = sinfo->htab->first->secinfo;
658 for (e = sinfo->htab->first; e; e = e->next)
660 if (e->secinfo != secinfo)
662 secinfo->sec->size = size;
663 secinfo = e->secinfo;
665 if (e->alignment)
667 if (e->secinfo->first_str == NULL)
669 e->secinfo->first_str = e;
670 size = 0;
672 size = (size + e->alignment - 1) & ~((bfd_vma) e->alignment - 1);
673 e->u.index = size;
674 size += e->len;
677 secinfo->sec->size = size;
678 if (secinfo->sec->alignment_power != 0)
680 bfd_size_type align = (bfd_size_type) 1 << secinfo->sec->alignment_power;
681 secinfo->sec->size = (secinfo->sec->size + align - 1) & -align;
684 /* And now adjust the rest, removing them from the chain (but not hashtable)
685 at the same time. */
686 for (a = &sinfo->htab->first, e = *a; e; e = e->next)
687 if (e->alignment)
688 a = &e->next;
689 else
691 *a = e->next;
692 if (e->len)
694 e->secinfo = e->u.suffix->secinfo;
695 e->alignment = e->u.suffix->alignment;
696 e->u.index = e->u.suffix->u.index + (e->u.suffix->len - e->len);
701 /* This function is called once after all SEC_MERGE sections are registered
702 with _bfd_merge_section. */
704 bfd_boolean
705 _bfd_merge_sections (bfd *abfd,
706 struct bfd_link_info *info ATTRIBUTE_UNUSED,
707 void *xsinfo,
708 void (*remove_hook) (bfd *, asection *))
710 struct sec_merge_info *sinfo;
712 for (sinfo = (struct sec_merge_info *) xsinfo; sinfo; sinfo = sinfo->next)
714 struct sec_merge_sec_info * secinfo;
716 if (! sinfo->chain)
717 continue;
719 /* Move sinfo->chain to head of the chain, terminate it. */
720 secinfo = sinfo->chain;
721 sinfo->chain = secinfo->next;
722 secinfo->next = NULL;
724 /* Record the sections into the hash table. */
725 for (secinfo = sinfo->chain; secinfo; secinfo = secinfo->next)
726 if (secinfo->sec->flags & SEC_EXCLUDE)
728 *secinfo->psecinfo = NULL;
729 if (remove_hook)
730 (*remove_hook) (abfd, secinfo->sec);
732 else if (! record_section (sinfo, secinfo))
733 break;
735 if (secinfo)
736 continue;
738 if (sinfo->htab->first == NULL)
739 continue;
741 if (sinfo->htab->strings)
742 merge_strings (sinfo);
743 else
745 struct sec_merge_hash_entry *e;
746 bfd_size_type size = 0;
748 /* Things are much simpler for non-strings.
749 Just assign them slots in the section. */
750 secinfo = NULL;
751 for (e = sinfo->htab->first; e; e = e->next)
753 if (e->secinfo->first_str == NULL)
755 if (secinfo)
756 secinfo->sec->size = size;
757 e->secinfo->first_str = e;
758 size = 0;
760 size = (size + e->alignment - 1)
761 & ~((bfd_vma) e->alignment - 1);
762 e->u.index = size;
763 size += e->len;
764 secinfo = e->secinfo;
766 secinfo->sec->size = size;
769 /* Finally remove all input sections which have not made it into
770 the hash table at all. */
771 for (secinfo = sinfo->chain; secinfo; secinfo = secinfo->next)
772 if (secinfo->first_str == NULL)
773 secinfo->sec->flags |= SEC_EXCLUDE | SEC_KEEP;
776 return TRUE;
779 /* Write out the merged section. */
781 bfd_boolean
782 _bfd_write_merged_section (bfd *output_bfd, asection *sec, void *psecinfo)
784 struct sec_merge_sec_info *secinfo;
785 file_ptr pos;
787 secinfo = (struct sec_merge_sec_info *) psecinfo;
789 if (!secinfo)
790 return FALSE;
792 if (secinfo->first_str == NULL)
793 return TRUE;
795 pos = sec->output_section->filepos + sec->output_offset;
796 if (bfd_seek (output_bfd, pos, SEEK_SET) != 0)
797 return FALSE;
799 if (! sec_merge_emit (output_bfd, secinfo->first_str))
800 return FALSE;
802 return TRUE;
805 /* Adjust an address in the SEC_MERGE section. Given OFFSET within
806 *PSEC, this returns the new offset in the adjusted SEC_MERGE
807 section and writes the new section back into *PSEC. */
809 bfd_vma
810 _bfd_merged_section_offset (bfd *output_bfd ATTRIBUTE_UNUSED, asection **psec,
811 void *psecinfo, bfd_vma offset)
813 struct sec_merge_sec_info *secinfo;
814 struct sec_merge_hash_entry *entry;
815 unsigned char *p;
816 asection *sec = *psec;
818 secinfo = (struct sec_merge_sec_info *) psecinfo;
820 if (!secinfo)
821 return offset;
823 if (offset >= sec->rawsize)
825 if (offset > sec->rawsize)
827 (*_bfd_error_handler)
828 (_("%s: access beyond end of merged section (%ld)"),
829 bfd_get_filename (sec->owner), (long) offset);
831 return secinfo->first_str ? sec->size : 0;
834 if (secinfo->htab->strings)
836 if (sec->entsize == 1)
838 p = secinfo->contents + offset - 1;
839 while (p >= secinfo->contents && *p)
840 --p;
841 ++p;
843 else
845 p = secinfo->contents + (offset / sec->entsize) * sec->entsize;
846 p -= sec->entsize;
847 while (p >= secinfo->contents)
849 unsigned int i;
851 for (i = 0; i < sec->entsize; ++i)
852 if (p[i] != '\0')
853 break;
854 if (i == sec->entsize)
855 break;
856 p -= sec->entsize;
858 p += sec->entsize;
861 else
863 p = secinfo->contents + (offset / sec->entsize) * sec->entsize;
865 entry = sec_merge_hash_lookup (secinfo->htab, (char *) p, 0, FALSE);
866 if (!entry)
868 if (! secinfo->htab->strings)
869 abort ();
870 /* This should only happen if somebody points into the padding
871 after a NUL character but before next entity. */
872 if (*p)
873 abort ();
874 if (! secinfo->htab->first)
875 abort ();
876 entry = secinfo->htab->first;
877 p = (secinfo->contents + (offset / sec->entsize + 1) * sec->entsize
878 - entry->len);
881 *psec = entry->secinfo->sec;
882 return entry->u.index + (secinfo->contents + offset - p);