1 /* symbols.c -symbol table-
2 Copyright (C) 1987, 1990, 1991, 1992, 1993 Free Software Foundation, Inc.
4 This file is part of GAS, the GNU Assembler.
6 GAS is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GAS is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GAS; see the file COPYING. If not, write to
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
26 #include "obstack.h" /* For "symbols.h" */
29 #ifndef WORKING_DOT_WORD
30 extern int new_broken_words;
33 /* symbol-name => struct symbol pointer */
34 static struct hash_control *sy_hash;
36 /* Below are commented in "symbols.h". */
37 symbolS *symbol_rootP;
38 symbolS *symbol_lastP;
41 symbolS *dot_text_symbol;
42 symbolS *dot_data_symbol;
43 symbolS *dot_bss_symbol;
47 static void fb_label_init PARAMS ((void));
53 symbol_rootP = NULL; /* In case we have 0 symbols (!!) */
54 sy_hash = hash_new ();
55 memset ((char *) (&abs_symbol), '\0', sizeof (abs_symbol));
57 abs_symbol.bsym = bfd_abs_section.symbol;
59 /* Can't initialise a union. Sigh. */
60 S_SET_SEGMENT (&abs_symbol, absolute_section);
62 #ifdef LOCAL_LABELS_FB
64 #endif /* LOCAL_LABELS_FB */
70 * Return a pointer to a new symbol.
71 * Die if we can't make a new symbol.
72 * Fill in the symbol's values.
73 * Add symbol to end of symbol chain.
76 * Please always call this to create a new symbol.
78 * Changes since 1985: Symbol names may not contain '\0'. Sigh.
79 * 2nd argument is now a SEG rather than a TYPE. The mapping between
80 * segments and types is mostly encapsulated herein (actually, we inherit it
81 * from macros in struc-symbol.h).
85 symbol_new (name, segment, value, frag)
86 CONST char *name; /* It is copied, the caller can destroy/modify */
87 segT segment; /* Segment identifier (SEG_<something>) */
88 valueT value; /* Symbol value */
89 fragS *frag; /* Associated fragment */
91 unsigned int name_length;
92 char *preserved_copy_of_name;
95 name_length = strlen (name) + 1; /* +1 for \0 */
96 obstack_grow (¬es, name, name_length);
97 preserved_copy_of_name = obstack_finish (¬es);
98 #ifdef STRIP_UNDERSCORE
99 if (preserved_copy_of_name[0] == '_')
100 preserved_copy_of_name++;
102 symbolP = (symbolS *) obstack_alloc (¬es, sizeof (symbolS));
104 /* symbol must be born in some fixed state. This seems as good as any. */
105 memset (symbolP, 0, sizeof (symbolS));
109 symbolP->bsym = bfd_make_empty_symbol (stdoutput);
110 assert (symbolP->bsym != 0);
111 symbolP->bsym->udata = (PTR) symbolP;
113 S_SET_NAME (symbolP, preserved_copy_of_name);
115 S_SET_SEGMENT (symbolP, segment);
116 S_SET_VALUE (symbolP, value);
117 symbol_clear_list_pointers(symbolP);
119 symbolP->sy_frag = frag;
120 #ifndef BFD_ASSEMBLER
121 symbolP->sy_number = ~0;
122 symbolP->sy_name_offset = ~0;
126 * Link to end of symbol chain.
128 symbol_append (symbolP, symbol_lastP, &symbol_rootP, &symbol_lastP);
130 obj_symbol_new_hook (symbolP);
133 verify_symbol_chain(symbol_rootP, symbol_lastP);
143 * We have just seen "<name>:".
144 * Creates a struct symbol unless it already exists.
146 * Gripes if we are redefining a symbol incompatibly (and ignores it).
150 colon (sym_name) /* just seen "x:" - rattle symbols & frags */
151 register char *sym_name; /* symbol name, as a cannonical string */
152 /* We copy this string: OK to alter later. */
154 register symbolS *symbolP; /* symbol we are working with */
156 #ifdef LOCAL_LABELS_DOLLAR
157 /* Sun local labels go out of scope whenever a non-local symbol is
160 if (*sym_name != 'L')
161 dollar_label_clear ();
162 #endif /* LOCAL_LABELS_DOLLAR */
164 #ifndef WORKING_DOT_WORD
165 if (new_broken_words)
167 struct broken_word *a;
172 extern const int md_short_jump_size;
173 extern const int md_long_jump_size;
174 possible_bytes = (md_short_jump_size
175 + new_broken_words * md_long_jump_size);
178 frag_opcode = frag_var (rs_broken_word,
182 (symbolS *) broken_words,
186 /* We want to store the pointer to where to insert the jump table in the
187 fr_opcode of the rs_broken_word frag. This requires a little
190 && (frag_tmp->fr_type != rs_broken_word
191 || frag_tmp->fr_opcode))
192 frag_tmp = frag_tmp->fr_next;
194 frag_tmp->fr_opcode = frag_opcode;
195 new_broken_words = 0;
197 for (a = broken_words; a && a->dispfrag == 0; a = a->next_broken_word)
198 a->dispfrag = frag_tmp;
200 #endif /* WORKING_DOT_WORD */
202 if ((symbolP = symbol_find (sym_name)) != 0)
204 #ifdef RESOLVE_SYMBOL_REDEFINITION
205 if (RESOLVE_SYMBOL_REDEFINITION (symbolP))
209 * Now check for undefined symbols
211 if (!S_IS_DEFINED (symbolP))
213 if (S_GET_VALUE (symbolP) == 0)
215 symbolP->sy_frag = frag_now;
217 S_GET_OTHER(symbolP) = const_flag;
219 S_SET_VALUE (symbolP, (valueT) ((char*)obstack_next_free (&frags) - frag_now->fr_literal));
220 S_SET_SEGMENT (symbolP, now_seg);
223 #endif /* if we have one, it better be zero. */
229 * There are still several cases to check:
230 * A .comm/.lcomm symbol being redefined as
231 * initialized data is OK
232 * A .comm/.lcomm symbol being redefined with
233 * a larger size is also OK
235 * This only used to be allowed on VMS gas, but Sun cc
236 * on the sparc also depends on it.
239 if (((!S_IS_DEBUG (symbolP)
240 && !S_IS_DEFINED (symbolP)
241 && S_IS_EXTERNAL (symbolP))
242 || S_GET_SEGMENT (symbolP) == bss_section)
243 && (now_seg == data_section
244 || now_seg == S_GET_SEGMENT (symbolP)))
247 * Select which of the 2 cases this is
249 if (now_seg != data_section)
252 * New .comm for prev .comm symbol.
253 * If the new size is larger we just
254 * change its value. If the new size
255 * is smaller, we ignore this symbol
257 if (S_GET_VALUE (symbolP)
258 < ((unsigned) frag_now_fix ()))
260 S_SET_VALUE (symbolP, (valueT) frag_now_fix ());
265 /* It is a .comm/.lcomm being converted to initialized
267 symbolP->sy_frag = frag_now;
269 S_GET_OTHER(symbolP) = const_flag;
271 S_SET_VALUE (symbolP, (valueT) frag_now_fix ());
272 S_SET_SEGMENT (symbolP, now_seg); /* keep N_EXT bit */
277 #if defined (S_GET_OTHER) && defined (S_GET_DESC)
278 as_fatal ("Symbol \"%s\" is already defined as \"%s\"/%d.%d.%ld.",
280 segment_name (S_GET_SEGMENT (symbolP)),
281 S_GET_OTHER (symbolP), S_GET_DESC (symbolP),
282 (long) S_GET_VALUE (symbolP));
284 as_fatal ("Symbol \"%s\" is already defined as \"%s\"/%d.",
286 segment_name (S_GET_SEGMENT (symbolP)),
287 S_GET_VALUE (symbolP));
290 } /* if the undefined symbol has no value */
294 /* Don't blow up if the definition is the same */
295 if (!(frag_now == symbolP->sy_frag
296 && S_GET_VALUE (symbolP) == (char*)obstack_next_free (&frags) - frag_now->fr_literal
297 && S_GET_SEGMENT (symbolP) == now_seg))
298 as_fatal ("Symbol %s already defined.", sym_name);
299 } /* if this symbol is not yet defined */
304 symbolP = symbol_new (sym_name,
306 (valueT) ((char*)obstack_next_free (&frags) - frag_now->fr_literal),
309 S_SET_OTHER (symbolP, const_flag);
312 symbol_table_insert (symbolP);
313 } /* if we have seen this symbol before */
316 tc_frob_label (symbolP);
324 * symbol_table_insert()
326 * Die if we can't insert the symbol.
331 symbol_table_insert (symbolP)
334 register char *error_string;
337 know (S_GET_NAME (symbolP));
339 if (*(error_string = hash_jam (sy_hash, S_GET_NAME (symbolP), (char *) symbolP)))
341 as_fatal ("Inserting \"%s\" into symbol table failed: %s",
342 S_GET_NAME (symbolP), error_string);
344 } /* symbol_table_insert() */
347 * symbol_find_or_make()
349 * If a symbol name does not exist, create it as undefined, and insert
350 * it into the symbol table. Return a pointer to it.
353 symbol_find_or_make (name)
356 register symbolS *symbolP;
358 symbolP = symbol_find (name);
362 symbolP = symbol_make (name);
364 symbol_table_insert (symbolP);
365 } /* if symbol wasn't found */
368 } /* symbol_find_or_make() */
376 /* Let the machine description default it, e.g. for register names. */
377 symbolP = md_undefined_symbol ((char *) name);
380 symbolP = symbol_new (name, undefined_section, (valueT) 0, &zero_address_frag);
383 } /* symbol_make() */
388 * Implement symbol table lookup.
389 * In: A symbol's name as a string: '\0' can't be part of a symbol name.
390 * Out: NULL if the name was not in the symbol table, else the address
391 * of a struct symbol associated with that name.
398 #ifdef STRIP_UNDERSCORE
399 return (symbol_find_base (name, 1));
400 #else /* STRIP_UNDERSCORE */
401 return (symbol_find_base (name, 0));
402 #endif /* STRIP_UNDERSCORE */
403 } /* symbol_find() */
406 symbol_find_base (name, strip_underscore)
408 int strip_underscore;
410 if (strip_underscore && *name == '_')
412 return ((symbolS *) hash_find (sy_hash, name));
416 * Once upon a time, symbols were kept in a singly linked list. At
417 * least coff needs to be able to rearrange them from time to time, for
418 * which a doubly linked list is much more convenient. Loic did these
419 * as macros which seemed dangerous to me so they're now functions.
423 /* Link symbol ADDME after symbol TARGET in the chain. */
425 symbol_append (addme, target, rootPP, lastPP)
433 know (*rootPP == NULL);
434 know (*lastPP == NULL);
438 } /* if the list is empty */
440 if (target->sy_next != NULL)
442 #ifdef SYMBOLS_NEED_BACKPOINTERS
443 target->sy_next->sy_previous = addme;
444 #endif /* SYMBOLS_NEED_BACKPOINTERS */
448 know (*lastPP == target);
450 } /* if we have a next */
452 addme->sy_next = target->sy_next;
453 target->sy_next = addme;
455 #ifdef SYMBOLS_NEED_BACKPOINTERS
456 addme->sy_previous = target;
457 #endif /* SYMBOLS_NEED_BACKPOINTERS */
460 #ifdef SYMBOLS_NEED_BACKPOINTERS
461 /* Remove SYMBOLP from the list. */
463 symbol_remove (symbolP, rootPP, lastPP)
468 if (symbolP == *rootPP)
470 *rootPP = symbolP->sy_next;
471 } /* if it was the root */
473 if (symbolP == *lastPP)
475 *lastPP = symbolP->sy_previous;
476 } /* if it was the tail */
478 if (symbolP->sy_next != NULL)
480 symbolP->sy_next->sy_previous = symbolP->sy_previous;
483 if (symbolP->sy_previous != NULL)
485 symbolP->sy_previous->sy_next = symbolP->sy_next;
489 verify_symbol_chain (*rootPP, *lastPP);
493 /* Set the chain pointers of SYMBOL to null. */
495 symbol_clear_list_pointers (symbolP)
498 symbolP->sy_next = NULL;
499 symbolP->sy_previous = NULL;
502 /* Link symbol ADDME before symbol TARGET in the chain. */
504 symbol_insert (addme, target, rootPP, lastPP)
510 if (target->sy_previous != NULL)
512 target->sy_previous->sy_next = addme;
516 know (*rootPP == target);
520 addme->sy_previous = target->sy_previous;
521 target->sy_previous = addme;
522 addme->sy_next = target;
525 verify_symbol_chain (*rootPP, *lastPP);
529 #endif /* SYMBOLS_NEED_BACKPOINTERS */
532 verify_symbol_chain (rootP, lastP)
536 symbolS *symbolP = rootP;
541 for (; symbol_next (symbolP) != NULL; symbolP = symbol_next (symbolP))
543 #ifdef SYMBOLS_NEED_BACKPOINTERS
544 know (symbolP->sy_next->sy_previous == symbolP);
546 /* Walk the list anyways, to make sure pointers are still good. */
548 #endif /* SYMBOLS_NEED_BACKPOINTERS */
551 assert (lastP == symbolP);
555 verify_symbol_chain_2 (sym)
558 symbolS *p = sym, *n = sym;
559 #ifdef SYMBOLS_NEED_BACKPOINTERS
560 while (symbol_previous (p))
561 p = symbol_previous (p);
563 while (symbol_next (n))
565 verify_symbol_chain (p, n);
568 /* Resolve the value of a symbol. This is called during the final
569 pass over the symbol table to resolve any symbols with complex
573 resolve_symbol_value (symp)
576 if (symp->sy_resolved)
579 if (symp->sy_resolving)
581 as_bad ("Symbol definition loop encountered at %s",
583 S_SET_VALUE (symp, (valueT) 0);
587 offsetT left, right, val;
588 segT seg_left, seg_right;
590 symp->sy_resolving = 1;
592 switch (symp->sy_value.X_op)
595 S_SET_VALUE (symp, 0);
598 S_SET_VALUE (symp, S_GET_VALUE (symp) + symp->sy_frag->fr_address);
599 if (S_GET_SEGMENT (symp) == expr_section)
600 S_SET_SEGMENT (symp, absolute_section);
604 resolve_symbol_value (symp->sy_value.X_add_symbol);
606 #ifdef obj_frob_forward_symbol
607 /* Some object formats need to forward the segment. */
608 obj_frob_forward_symbol (symp);
612 (symp->sy_value.X_add_number
613 + symp->sy_frag->fr_address
614 + S_GET_VALUE (symp->sy_value.X_add_symbol)));
615 if (S_GET_SEGMENT (symp) == expr_section
616 || S_GET_SEGMENT (symp) == undefined_section)
618 S_GET_SEGMENT (symp->sy_value.X_add_symbol));
623 resolve_symbol_value (symp->sy_value.X_add_symbol);
624 if (symp->sy_value.X_op == O_uminus)
625 val = - S_GET_VALUE (symp->sy_value.X_add_symbol);
627 val = ~ S_GET_VALUE (symp->sy_value.X_add_symbol);
630 + symp->sy_value.X_add_number
631 + symp->sy_frag->fr_address));
632 if (S_GET_SEGMENT (symp) == expr_section
633 || S_GET_SEGMENT (symp) == undefined_section)
634 S_SET_SEGMENT (symp, absolute_section);
642 case O_bit_inclusive_or:
644 case O_bit_exclusive_or:
648 resolve_symbol_value (symp->sy_value.X_add_symbol);
649 resolve_symbol_value (symp->sy_value.X_op_symbol);
650 seg_left = S_GET_SEGMENT (symp->sy_value.X_add_symbol);
651 seg_right = S_GET_SEGMENT (symp->sy_value.X_op_symbol);
652 if (seg_left != seg_right
653 && seg_left != undefined_section
654 && seg_right != undefined_section)
655 as_bad ("%s is operation on symbols in different sections",
657 if ((S_GET_SEGMENT (symp->sy_value.X_add_symbol)
659 && symp->sy_value.X_op != O_subtract)
660 as_bad ("%s is illegal operation on non-absolute symbols",
662 left = S_GET_VALUE (symp->sy_value.X_add_symbol);
663 right = S_GET_VALUE (symp->sy_value.X_op_symbol);
664 switch (symp->sy_value.X_op)
666 case O_multiply: val = left * right; break;
667 case O_divide: val = left / right; break;
668 case O_modulus: val = left % right; break;
669 case O_left_shift: val = left << right; break;
670 case O_right_shift: val = left >> right; break;
671 case O_bit_inclusive_or: val = left | right; break;
672 case O_bit_or_not: val = left |~ right; break;
673 case O_bit_exclusive_or: val = left ^ right; break;
674 case O_bit_and: val = left & right; break;
675 case O_add: val = left + right; break;
676 case O_subtract: val = left - right; break;
680 (symp->sy_value.X_add_number
681 + symp->sy_frag->fr_address
683 if (S_GET_SEGMENT (symp) == expr_section
684 || S_GET_SEGMENT (symp) == undefined_section)
685 S_SET_SEGMENT (symp, absolute_section);
691 as_bad ("bad value for symbol \"%s\"", S_GET_NAME (symp));
696 symp->sy_resolved = 1;
699 #ifdef LOCAL_LABELS_DOLLAR
701 /* Dollar labels look like a number followed by a dollar sign. Eg, "42$".
702 They are *really* local. That is, they go out of scope whenever we see a
703 label that isn't local. Also, like fb labels, there can be multiple
704 instances of a dollar label. Therefor, we name encode each instance with
705 the instance number, keep a list of defined symbols separate from the real
706 symbol table, and we treat these buggers as a sparse array. */
708 static long *dollar_labels;
709 static long *dollar_label_instances;
710 static char *dollar_label_defines;
711 static long dollar_label_count;
712 static long dollar_label_max;
715 dollar_label_defined (label)
720 know ((dollar_labels != NULL) || (dollar_label_count == 0));
722 for (i = dollar_labels; i < dollar_labels + dollar_label_count; ++i)
724 return dollar_label_defines[i - dollar_labels];
726 /* if we get here, label isn't defined */
728 } /* dollar_label_defined() */
731 dollar_label_instance (label)
736 know ((dollar_labels != NULL) || (dollar_label_count == 0));
738 for (i = dollar_labels; i < dollar_labels + dollar_label_count; ++i)
740 return (dollar_label_instances[i - dollar_labels]);
742 /* If we get here, we haven't seen the label before, therefore its instance
748 dollar_label_clear ()
750 memset (dollar_label_defines, '\0', dollar_label_count);
753 #define DOLLAR_LABEL_BUMP_BY 10
756 define_dollar_label (label)
761 for (i = dollar_labels; i < dollar_labels + dollar_label_count; ++i)
764 ++dollar_label_instances[i - dollar_labels];
765 dollar_label_defines[i - dollar_labels] = 1;
769 /* if we get to here, we don't have label listed yet. */
771 if (dollar_labels == NULL)
773 dollar_labels = (long *) xmalloc (DOLLAR_LABEL_BUMP_BY * sizeof (long));
774 dollar_label_instances = (long *) xmalloc (DOLLAR_LABEL_BUMP_BY * sizeof (long));
775 dollar_label_defines = xmalloc (DOLLAR_LABEL_BUMP_BY);
776 dollar_label_max = DOLLAR_LABEL_BUMP_BY;
777 dollar_label_count = 0;
779 else if (dollar_label_count == dollar_label_max)
781 dollar_label_max += DOLLAR_LABEL_BUMP_BY;
782 dollar_labels = (long *) xrealloc ((char *) dollar_labels,
783 dollar_label_max * sizeof (long));
784 dollar_label_instances = (long *) xrealloc ((char *) dollar_label_instances,
785 dollar_label_max * sizeof (long));
786 dollar_label_defines = xrealloc (dollar_label_defines, dollar_label_max);
787 } /* if we needed to grow */
789 dollar_labels[dollar_label_count] = label;
790 dollar_label_instances[dollar_label_count] = 1;
791 dollar_label_defines[dollar_label_count] = 1;
792 ++dollar_label_count;
796 * dollar_label_name()
798 * Caller must copy returned name: we re-use the area for the next name.
800 * The mth occurence of label n: is turned into the symbol "Ln^Am"
801 * where n is the label number and m is the instance number. "L" makes
802 * it a label discarded unless debugging and "^A"('\1') ensures no
803 * ordinary symbol SHOULD get the same name as a local label
804 * symbol. The first "4:" is "L4^A1" - the m numbers begin at 1.
806 * fb labels get the same treatment, except that ^B is used in place of ^A.
809 char * /* Return local label name. */
810 dollar_label_name (n, augend)
811 register long n; /* we just saw "n$:" : n a number */
812 register int augend; /* 0 for current instance, 1 for new instance */
815 /* Returned to caller, then copied. used for created names ("4f") */
816 static char symbol_name_build[24];
819 char symbol_name_temporary[20]; /* build up a number, BACKWARDS */
822 know (augend == 0 || augend == 1);
823 p = symbol_name_build;
826 /* Next code just does sprintf( {}, "%d", n); */
828 q = symbol_name_temporary;
829 for (*q++ = 0, i = n; i; ++q)
834 while ((*p = *--q) != '\0')
839 /* instance number */
840 q = symbol_name_temporary;
841 for (*q++ = 0, i = dollar_label_instance (n) + augend; i; ++q)
846 while ((*p++ = *--q) != '\0');;
848 /* The label, as a '\0' ended string, starts at symbol_name_build. */
849 return symbol_name_build;
852 #endif /* LOCAL_LABELS_DOLLAR */
854 #ifdef LOCAL_LABELS_FB
857 * Sombody else's idea of local labels. They are made by "n:" where n
858 * is any decimal digit. Refer to them with
859 * "nb" for previous (backward) n:
860 * or "nf" for next (forward) n:.
862 * We do a little better and let n be any number, not just a single digit, but
863 * since the other guy's assembler only does ten, we treat the first ten
866 * Like someone else's assembler, we have one set of local label counters for
867 * entire assembly, not one set per (sub)segment like in most assemblers. This
868 * implies that one can refer to a label in another segment, and indeed some
869 * crufty compilers have done just that.
871 * Since there could be a LOT of these things, treat them as a sparse array.
874 #define FB_LABEL_SPECIAL (10)
876 static long fb_low_counter[FB_LABEL_SPECIAL];
877 static long *fb_labels;
878 static long *fb_label_instances;
879 static long fb_label_count = 0;
880 static long fb_label_max = 0;
882 /* this must be more than FB_LABEL_SPECIAL */
883 #define FB_LABEL_BUMP_BY (FB_LABEL_SPECIAL + 6)
888 memset ((void *) fb_low_counter, '\0', sizeof (fb_low_counter));
889 } /* fb_label_init() */
891 /* add one to the instance number of this fb label */
893 fb_label_instance_inc (label)
898 if (label < FB_LABEL_SPECIAL)
900 ++fb_low_counter[label];
904 if (fb_labels != NULL)
906 for (i = fb_labels + FB_LABEL_SPECIAL;
907 i < fb_labels + fb_label_count; ++i)
911 ++fb_label_instances[i - fb_labels];
913 } /* if we find it */
914 } /* for each existing label */
917 /* if we get to here, we don't have label listed yet. */
919 if (fb_labels == NULL)
921 fb_labels = (long *) xmalloc (FB_LABEL_BUMP_BY * sizeof (long));
922 fb_label_instances = (long *) xmalloc (FB_LABEL_BUMP_BY * sizeof (long));
923 fb_label_max = FB_LABEL_BUMP_BY;
924 fb_label_count = FB_LABEL_SPECIAL;
927 else if (fb_label_count == fb_label_max)
929 fb_label_max += FB_LABEL_BUMP_BY;
930 fb_labels = (long *) xrealloc ((char *) fb_labels,
931 fb_label_max * sizeof (long));
932 fb_label_instances = (long *) xrealloc ((char *) fb_label_instances,
933 fb_label_max * sizeof (long));
934 } /* if we needed to grow */
936 fb_labels[fb_label_count] = label;
937 fb_label_instances[fb_label_count] = 1;
940 } /* fb_label_instance_inc() */
943 fb_label_instance (label)
948 if (label < FB_LABEL_SPECIAL)
950 return (fb_low_counter[label]);
953 if (fb_labels != NULL)
955 for (i = fb_labels + FB_LABEL_SPECIAL;
956 i < fb_labels + fb_label_count; ++i)
960 return (fb_label_instances[i - fb_labels]);
961 } /* if we find it */
962 } /* for each existing label */
965 /* We didn't find the label, so this must be a reference to the
973 * Caller must copy returned name: we re-use the area for the next name.
975 * The mth occurence of label n: is turned into the symbol "Ln^Bm"
976 * where n is the label number and m is the instance number. "L" makes
977 * it a label discarded unless debugging and "^B"('\2') ensures no
978 * ordinary symbol SHOULD get the same name as a local label
979 * symbol. The first "4:" is "L4^B1" - the m numbers begin at 1.
981 * dollar labels get the same treatment, except that ^A is used in place of ^B. */
983 char * /* Return local label name. */
984 fb_label_name (n, augend)
985 long n; /* we just saw "n:", "nf" or "nb" : n a number */
986 long augend; /* 0 for nb, 1 for n:, nf */
989 /* Returned to caller, then copied. used for created names ("4f") */
990 static char symbol_name_build[24];
993 char symbol_name_temporary[20]; /* build up a number, BACKWARDS */
996 know (augend == 0 || augend == 1);
997 p = symbol_name_build;
1000 /* Next code just does sprintf( {}, "%d", n); */
1002 q = symbol_name_temporary;
1003 for (*q++ = 0, i = n; i; ++q)
1008 while ((*p = *--q) != '\0')
1013 /* instance number */
1014 q = symbol_name_temporary;
1015 for (*q++ = 0, i = fb_label_instance (n) + augend; i; ++q)
1020 while ((*p++ = *--q) != '\0');;
1022 /* The label, as a '\0' ended string, starts at symbol_name_build. */
1023 return (symbol_name_build);
1024 } /* fb_label_name() */
1026 #endif /* LOCAL_LABELS_FB */
1030 * decode name that may have been generated by foo_label_name() above. If
1031 * the name wasn't generated by foo_label_name(), then return it unaltered.
1032 * This is used for error messages.
1036 decode_local_label_name (s)
1040 char *symbol_decode;
1042 int instance_number;
1044 const char *message_format = "\"%d\" (instance number %d of a %s label)";
1049 for (label_number = 0, p = s + 1; isdigit (*p); ++p)
1051 label_number = (10 * label_number) + *p - '0';
1067 for (instance_number = 0, p = s + 1; isdigit (*p); ++p)
1069 instance_number = (10 * instance_number) + *p - '0';
1072 symbol_decode = obstack_alloc (¬es, strlen (message_format) + 30);
1073 (void) sprintf (symbol_decode, message_format, label_number,
1074 instance_number, type);
1076 return (symbol_decode);
1077 } /* decode_local_label_name() */
1079 /* Get the value of a symbol. */
1085 if (s->sy_value.X_op != O_constant)
1086 as_bad ("Attempt to get value of unresolved symbol %s", S_GET_NAME (s));
1087 return (valueT) s->sy_value.X_add_number;
1090 /* Set the value of a symbol. */
1093 S_SET_VALUE (s, val)
1097 s->sy_value.X_op = O_constant;
1098 s->sy_value.X_add_number = (offsetT) val;
1101 #ifdef BFD_ASSEMBLER
1107 flagword flags = s->bsym->flags;
1110 if (flags & BSF_LOCAL && flags & (BSF_EXPORT | BSF_GLOBAL))
1113 return (flags & (BSF_EXPORT | BSF_GLOBAL)) != 0;
1120 return s->bsym->section == &bfd_com_section;
1127 return s->bsym->section != undefined_section;
1134 if (s->bsym->flags & BSF_DEBUGGING)
1143 flagword flags = s->bsym->flags;
1146 if (flags & BSF_LOCAL && flags & (BSF_EXPORT | BSF_GLOBAL))
1149 return (S_GET_NAME (s)
1151 && (strchr (S_GET_NAME (s), '\001')
1152 || strchr (S_GET_NAME (s), '\002')
1153 || (S_LOCAL_NAME (s)
1154 && !flagseen['L'])));
1161 return S_IS_EXTERNAL (s);
1168 return S_GET_NAME (s) == 0;
1175 return s->bsym->name;
1182 return s->bsym->section;
1186 S_SET_SEGMENT (s, seg)
1190 s->bsym->section = seg;
1197 s->bsym->flags |= BSF_EXPORT | BSF_GLOBAL;
1198 s->bsym->flags &= ~BSF_LOCAL;
1202 S_CLEAR_EXTERNAL (s)
1205 s->bsym->flags |= BSF_LOCAL;
1206 s->bsym->flags &= ~(BSF_EXPORT | BSF_GLOBAL);
1210 S_SET_NAME (s, name)
1214 s->bsym->name = name;
1216 #endif /* BFD_ASSEMBLER */
1218 /* end of symbols.c */