1 /* symbols.c -symbol table-
2 Copyright (C) 1987, 1990, 1991, 1992, 1993, 1994
3 Free Software Foundation, Inc.
5 This file is part of GAS, the GNU Assembler.
7 GAS 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, or (at your option)
12 GAS 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.
17 You should have received a copy of the GNU General Public License
18 along with GAS; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21 /* #define DEBUG_SYMS / * to debug symbol list maintenance */
27 #include "obstack.h" /* For "symbols.h" */
30 /* This is non-zero if symbols are case sensitive, which is the
32 int symbols_case_sensitive = 1;
34 #ifndef WORKING_DOT_WORD
35 extern int new_broken_words;
38 /* symbol-name => struct symbol pointer */
39 static struct hash_control *sy_hash;
41 /* Below are commented in "symbols.h". */
42 symbolS *symbol_rootP;
43 symbolS *symbol_lastP;
47 #define debug_verify_symchain verify_symbol_chain
49 #define debug_verify_symchain (void)
54 static void fb_label_init PARAMS ((void));
58 Return a pointer to a new symbol. Die if we can't make a new
59 symbol. Fill in the symbol's values. Add symbol to end of symbol
62 This function should be called in the general case of creating a
63 symbol. However, if the output file symbol table has already been
64 set, and you are certain that this symbol won't be wanted in the
65 output file, you can call symbol_create. */
68 symbol_new (name, segment, valu, frag)
74 symbolS *symbolP = symbol_create (name, segment, valu, frag);
77 * Link to end of symbol chain.
81 extern int symbol_table_frozen;
82 if (symbol_table_frozen)
86 symbol_append (symbolP, symbol_lastP, &symbol_rootP, &symbol_lastP);
87 debug_verify_symchain (symbol_rootP, symbol_lastP);
93 symbol_create (name, segment, valu, frag)
94 const char *name; /* It is copied, the caller can destroy/modify */
95 segT segment; /* Segment identifier (SEG_<something>) */
96 valueT valu; /* Symbol value */
97 fragS *frag; /* Associated fragment */
99 unsigned int name_length;
100 char *preserved_copy_of_name;
103 name_length = strlen (name) + 1; /* +1 for \0 */
104 obstack_grow (¬es, name, name_length);
105 preserved_copy_of_name = obstack_finish (¬es);
106 #ifdef STRIP_UNDERSCORE
107 if (preserved_copy_of_name[0] == '_')
108 preserved_copy_of_name++;
111 #ifdef tc_canonicalize_symbol_name
112 preserved_copy_of_name =
113 tc_canonicalize_symbol_name (preserved_copy_of_name);
116 if (! symbols_case_sensitive)
120 for (s = (unsigned char *) preserved_copy_of_name; *s != '\0'; s++)
125 symbolP = (symbolS *) obstack_alloc (¬es, sizeof (symbolS));
127 /* symbol must be born in some fixed state. This seems as good as any. */
128 memset (symbolP, 0, sizeof (symbolS));
131 symbolP->bsym = bfd_make_empty_symbol (stdoutput);
132 assert (symbolP->bsym != 0);
133 symbolP->bsym->udata.p = (PTR) symbolP;
135 S_SET_NAME (symbolP, preserved_copy_of_name);
137 S_SET_SEGMENT (symbolP, segment);
138 S_SET_VALUE (symbolP, valu);
139 symbol_clear_list_pointers (symbolP);
141 symbolP->sy_frag = frag;
142 #ifndef BFD_ASSEMBLER
143 symbolP->sy_number = ~0;
144 symbolP->sy_name_offset = (unsigned int) ~0;
147 obj_symbol_new_hook (symbolP);
149 #ifdef tc_symbol_new_hook
150 tc_symbol_new_hook (symbolP);
160 * We have just seen "<name>:".
161 * Creates a struct symbol unless it already exists.
163 * Gripes if we are redefining a symbol incompatibly (and ignores it).
167 colon (sym_name) /* just seen "x:" - rattle symbols & frags */
168 register char *sym_name; /* symbol name, as a cannonical string */
169 /* We copy this string: OK to alter later. */
171 register symbolS *symbolP; /* symbol we are working with */
173 /* Sun local labels go out of scope whenever a non-local symbol is
175 if (LOCAL_LABELS_DOLLAR && *sym_name != 'L')
176 dollar_label_clear ();
178 #ifndef WORKING_DOT_WORD
179 if (new_broken_words)
181 struct broken_word *a;
186 extern const int md_short_jump_size;
187 extern const int md_long_jump_size;
188 possible_bytes = (md_short_jump_size
189 + new_broken_words * md_long_jump_size);
192 frag_opcode = frag_var (rs_broken_word,
196 (symbolS *) broken_words,
200 /* We want to store the pointer to where to insert the jump table in the
201 fr_opcode of the rs_broken_word frag. This requires a little
204 && (frag_tmp->fr_type != rs_broken_word
205 || frag_tmp->fr_opcode))
206 frag_tmp = frag_tmp->fr_next;
208 frag_tmp->fr_opcode = frag_opcode;
209 new_broken_words = 0;
211 for (a = broken_words; a && a->dispfrag == 0; a = a->next_broken_word)
212 a->dispfrag = frag_tmp;
214 #endif /* WORKING_DOT_WORD */
216 if ((symbolP = symbol_find (sym_name)) != 0)
218 #ifdef RESOLVE_SYMBOL_REDEFINITION
219 if (RESOLVE_SYMBOL_REDEFINITION (symbolP))
223 * Now check for undefined symbols
225 if (!S_IS_DEFINED (symbolP))
227 if (S_GET_VALUE (symbolP) == 0)
229 symbolP->sy_frag = frag_now;
231 S_GET_OTHER(symbolP) = const_flag;
233 S_SET_VALUE (symbolP, (valueT) frag_now_fix ());
234 S_SET_SEGMENT (symbolP, now_seg);
237 #endif /* if we have one, it better be zero. */
243 * There are still several cases to check:
244 * A .comm/.lcomm symbol being redefined as
245 * initialized data is OK
246 * A .comm/.lcomm symbol being redefined with
247 * a larger size is also OK
249 * This only used to be allowed on VMS gas, but Sun cc
250 * on the sparc also depends on it.
253 if (((!S_IS_DEBUG (symbolP)
254 && !S_IS_DEFINED (symbolP)
255 && S_IS_EXTERNAL (symbolP))
256 || S_GET_SEGMENT (symbolP) == bss_section)
257 && (now_seg == data_section
258 || now_seg == S_GET_SEGMENT (symbolP)))
261 * Select which of the 2 cases this is
263 if (now_seg != data_section)
266 * New .comm for prev .comm symbol.
267 * If the new size is larger we just
268 * change its value. If the new size
269 * is smaller, we ignore this symbol
271 if (S_GET_VALUE (symbolP)
272 < ((unsigned) frag_now_fix ()))
274 S_SET_VALUE (symbolP, (valueT) frag_now_fix ());
279 /* It is a .comm/.lcomm being converted to initialized
281 symbolP->sy_frag = frag_now;
283 S_GET_OTHER(symbolP) = const_flag;
285 S_SET_VALUE (symbolP, (valueT) frag_now_fix ());
286 S_SET_SEGMENT (symbolP, now_seg); /* keep N_EXT bit */
291 #if defined (S_GET_OTHER) && defined (S_GET_DESC)
292 as_fatal ("Symbol \"%s\" is already defined as \"%s\"/%d.%d.%ld.",
294 segment_name (S_GET_SEGMENT (symbolP)),
295 S_GET_OTHER (symbolP), S_GET_DESC (symbolP),
296 (long) S_GET_VALUE (symbolP));
298 as_fatal ("Symbol \"%s\" is already defined as \"%s\"/%ld.",
300 segment_name (S_GET_SEGMENT (symbolP)),
301 (long) S_GET_VALUE (symbolP));
304 } /* if the undefined symbol has no value */
308 /* Don't blow up if the definition is the same */
309 if (!(frag_now == symbolP->sy_frag
310 && S_GET_VALUE (symbolP) == frag_now_fix ()
311 && S_GET_SEGMENT (symbolP) == now_seg))
312 as_fatal ("Symbol %s already defined.", sym_name);
313 } /* if this symbol is not yet defined */
318 symbolP = symbol_new (sym_name, now_seg, (valueT) frag_now_fix (),
321 S_SET_OTHER (symbolP, const_flag);
324 symbol_table_insert (symbolP);
325 } /* if we have seen this symbol before */
327 if (mri_common_symbol != NULL)
329 /* This symbol is actually being defined within an MRI common
330 section. This requires special handling. */
331 symbolP->sy_value.X_op = O_symbol;
332 symbolP->sy_value.X_add_symbol = mri_common_symbol;
333 symbolP->sy_value.X_add_number = S_GET_VALUE (mri_common_symbol);
334 symbolP->sy_frag = &zero_address_frag;
335 S_SET_SEGMENT (symbolP, expr_section);
336 symbolP->sy_mri_common = 1;
340 tc_frob_label (symbolP);
348 * symbol_table_insert()
350 * Die if we can't insert the symbol.
355 symbol_table_insert (symbolP)
358 register const char *error_string;
361 know (S_GET_NAME (symbolP));
363 if ((error_string = hash_jam (sy_hash, S_GET_NAME (symbolP), (PTR) symbolP)))
365 as_fatal ("Inserting \"%s\" into symbol table failed: %s",
366 S_GET_NAME (symbolP), error_string);
368 } /* symbol_table_insert() */
371 * symbol_find_or_make()
373 * If a symbol name does not exist, create it as undefined, and insert
374 * it into the symbol table. Return a pointer to it.
377 symbol_find_or_make (name)
380 register symbolS *symbolP;
382 symbolP = symbol_find (name);
386 symbolP = symbol_make (name);
388 symbol_table_insert (symbolP);
389 } /* if symbol wasn't found */
392 } /* symbol_find_or_make() */
400 /* Let the machine description default it, e.g. for register names. */
401 symbolP = md_undefined_symbol ((char *) name);
404 symbolP = symbol_new (name, undefined_section, (valueT) 0, &zero_address_frag);
407 } /* symbol_make() */
412 * Implement symbol table lookup.
413 * In: A symbol's name as a string: '\0' can't be part of a symbol name.
414 * Out: NULL if the name was not in the symbol table, else the address
415 * of a struct symbol associated with that name.
422 #ifdef STRIP_UNDERSCORE
423 return (symbol_find_base (name, 1));
424 #else /* STRIP_UNDERSCORE */
425 return (symbol_find_base (name, 0));
426 #endif /* STRIP_UNDERSCORE */
427 } /* symbol_find() */
430 symbol_find_base (name, strip_underscore)
432 int strip_underscore;
434 if (strip_underscore && *name == '_')
437 #ifdef tc_canonicalize_symbol_name
441 copy = (char *) alloca (strlen (name) + 1);
443 name = tc_canonicalize_symbol_name (copy);
447 if (! symbols_case_sensitive)
451 copy = (unsigned char *) alloca (strlen (name) + 1);
452 name = (const char *) copy;
453 for (; *copy != '\0'; copy++)
455 *copy = toupper (*copy);
458 return ((symbolS *) hash_find (sy_hash, name));
462 * Once upon a time, symbols were kept in a singly linked list. At
463 * least coff needs to be able to rearrange them from time to time, for
464 * which a doubly linked list is much more convenient. Loic did these
465 * as macros which seemed dangerous to me so they're now functions.
469 /* Link symbol ADDME after symbol TARGET in the chain. */
471 symbol_append (addme, target, rootPP, lastPP)
479 know (*rootPP == NULL);
480 know (*lastPP == NULL);
484 } /* if the list is empty */
486 if (target->sy_next != NULL)
488 #ifdef SYMBOLS_NEED_BACKPOINTERS
489 target->sy_next->sy_previous = addme;
490 #endif /* SYMBOLS_NEED_BACKPOINTERS */
494 know (*lastPP == target);
496 } /* if we have a next */
498 addme->sy_next = target->sy_next;
499 target->sy_next = addme;
501 #ifdef SYMBOLS_NEED_BACKPOINTERS
502 addme->sy_previous = target;
503 #endif /* SYMBOLS_NEED_BACKPOINTERS */
506 /* Set the chain pointers of SYMBOL to null. */
508 symbol_clear_list_pointers (symbolP)
511 symbolP->sy_next = NULL;
512 #ifdef SYMBOLS_NEED_BACKPOINTERS
513 symbolP->sy_previous = NULL;
517 #ifdef SYMBOLS_NEED_BACKPOINTERS
518 /* Remove SYMBOLP from the list. */
520 symbol_remove (symbolP, rootPP, lastPP)
525 if (symbolP == *rootPP)
527 *rootPP = symbolP->sy_next;
528 } /* if it was the root */
530 if (symbolP == *lastPP)
532 *lastPP = symbolP->sy_previous;
533 } /* if it was the tail */
535 if (symbolP->sy_next != NULL)
537 symbolP->sy_next->sy_previous = symbolP->sy_previous;
540 if (symbolP->sy_previous != NULL)
542 symbolP->sy_previous->sy_next = symbolP->sy_next;
545 debug_verify_symchain (*rootPP, *lastPP);
548 /* Link symbol ADDME before symbol TARGET in the chain. */
550 symbol_insert (addme, target, rootPP, lastPP)
556 if (target->sy_previous != NULL)
558 target->sy_previous->sy_next = addme;
562 know (*rootPP == target);
566 addme->sy_previous = target->sy_previous;
567 target->sy_previous = addme;
568 addme->sy_next = target;
570 debug_verify_symchain (*rootPP, *lastPP);
573 #endif /* SYMBOLS_NEED_BACKPOINTERS */
576 verify_symbol_chain (rootP, lastP)
580 symbolS *symbolP = rootP;
585 for (; symbol_next (symbolP) != NULL; symbolP = symbol_next (symbolP))
587 #ifdef SYMBOLS_NEED_BACKPOINTERS
588 know (symbolP->sy_next->sy_previous == symbolP);
590 /* Walk the list anyways, to make sure pointers are still good. */
592 #endif /* SYMBOLS_NEED_BACKPOINTERS */
595 assert (lastP == symbolP);
599 verify_symbol_chain_2 (sym)
602 symbolS *p = sym, *n = sym;
603 #ifdef SYMBOLS_NEED_BACKPOINTERS
604 while (symbol_previous (p))
605 p = symbol_previous (p);
607 while (symbol_next (n))
609 verify_symbol_chain (p, n);
612 /* Resolve the value of a symbol. This is called during the final
613 pass over the symbol table to resolve any symbols with complex
617 resolve_symbol_value (symp)
622 if (symp->sy_resolved)
627 if (symp->sy_resolving)
629 as_bad ("Symbol definition loop encountered at %s",
631 S_SET_VALUE (symp, (valueT) 0);
636 offsetT left, right, val;
637 segT seg_left, seg_right;
639 symp->sy_resolving = 1;
642 switch (symp->sy_value.X_op)
645 S_SET_VALUE (symp, 0);
648 S_SET_VALUE (symp, S_GET_VALUE (symp) + symp->sy_frag->fr_address);
649 if (S_GET_SEGMENT (symp) == expr_section)
650 S_SET_SEGMENT (symp, absolute_section);
655 resolve_symbol_value (symp->sy_value.X_add_symbol);
657 if (symp->sy_mri_common)
659 /* This is a symbol inside an MRI common section. The
660 relocation routines are going to handle it specially.
661 Don't change the value. */
662 S_SET_VALUE (symp, symp->sy_value.X_add_number);
663 resolved = symp->sy_value.X_add_symbol->sy_resolved;
667 #if 0 /* I thought this was needed for some of the i386-svr4 PIC
668 support, but it appears I was wrong, and it breaks rs6000
670 if (S_GET_SEGMENT (symp->sy_value.X_add_symbol) != undefined_section
671 && S_GET_SEGMENT (symp->sy_value.X_add_symbol) != expr_section)
674 if (symp->sy_value.X_add_number == 0)
675 copy_symbol_attributes (symp, symp->sy_value.X_add_symbol);
678 (symp->sy_value.X_add_number
679 + symp->sy_frag->fr_address
680 + S_GET_VALUE (symp->sy_value.X_add_symbol)));
681 if (S_GET_SEGMENT (symp) == expr_section
682 || S_GET_SEGMENT (symp) == undefined_section)
684 S_GET_SEGMENT (symp->sy_value.X_add_symbol));
686 resolved = symp->sy_value.X_add_symbol->sy_resolved;
691 resolve_symbol_value (symp->sy_value.X_add_symbol);
692 if (symp->sy_value.X_op == O_uminus)
693 val = - S_GET_VALUE (symp->sy_value.X_add_symbol);
695 val = ~ S_GET_VALUE (symp->sy_value.X_add_symbol);
698 + symp->sy_value.X_add_number
699 + symp->sy_frag->fr_address));
700 if (S_GET_SEGMENT (symp) == expr_section
701 || S_GET_SEGMENT (symp) == undefined_section)
702 S_SET_SEGMENT (symp, absolute_section);
703 resolved = symp->sy_value.X_add_symbol->sy_resolved;
707 resolve_symbol_value (symp->sy_value.X_add_symbol);
708 resolve_symbol_value (symp->sy_value.X_op_symbol);
709 seg_left = S_GET_SEGMENT (symp->sy_value.X_add_symbol);
710 seg_right = S_GET_SEGMENT (symp->sy_value.X_op_symbol);
711 /* This case comes up with PIC support. */
713 symbolS *s_left = symp->sy_value.X_add_symbol;
714 symbolS *s_right = symp->sy_value.X_op_symbol;
716 if (seg_left == absolute_section)
724 seg_left = seg_right;
727 if (seg_right == absolute_section
728 && s_right->sy_resolved)
730 symp->sy_value.X_add_number += S_GET_VALUE (s_right);
731 symp->sy_value.X_op_symbol = 0;
732 symp->sy_value.X_add_symbol = s_left;
733 symp->sy_value.X_op = O_symbol;
744 case O_bit_inclusive_or:
746 case O_bit_exclusive_or:
755 resolve_symbol_value (symp->sy_value.X_add_symbol);
756 resolve_symbol_value (symp->sy_value.X_op_symbol);
757 seg_left = S_GET_SEGMENT (symp->sy_value.X_add_symbol);
758 seg_right = S_GET_SEGMENT (symp->sy_value.X_op_symbol);
759 if (seg_left != seg_right
760 && seg_left != undefined_section
761 && seg_right != undefined_section)
762 as_bad ("%s is operation on symbols in different sections",
764 if ((S_GET_SEGMENT (symp->sy_value.X_add_symbol)
766 && symp->sy_value.X_op != O_subtract)
767 as_bad ("%s is illegal operation on non-absolute symbols",
769 left = S_GET_VALUE (symp->sy_value.X_add_symbol);
770 right = S_GET_VALUE (symp->sy_value.X_op_symbol);
771 switch (symp->sy_value.X_op)
773 case O_multiply: val = left * right; break;
774 case O_divide: val = left / right; break;
775 case O_modulus: val = left % right; break;
776 case O_left_shift: val = left << right; break;
777 case O_right_shift: val = left >> right; break;
778 case O_bit_inclusive_or: val = left | right; break;
779 case O_bit_or_not: val = left |~ right; break;
780 case O_bit_exclusive_or: val = left ^ right; break;
781 case O_bit_and: val = left & right; break;
782 case O_add: val = left + right; break;
783 case O_subtract: val = left - right; break;
784 case O_eq: val = left == right ? ~ (offsetT) 0 : 0;
785 case O_ne: val = left != right ? ~ (offsetT) 0 : 0;
786 case O_lt: val = left < right ? ~ (offsetT) 0 : 0;
787 case O_le: val = left <= right ? ~ (offsetT) 0 : 0;
788 case O_ge: val = left >= right ? ~ (offsetT) 0 : 0;
789 case O_gt: val = left > right ? ~ (offsetT) 0 : 0;
793 (symp->sy_value.X_add_number
794 + symp->sy_frag->fr_address
796 if (S_GET_SEGMENT (symp) == expr_section
797 || S_GET_SEGMENT (symp) == undefined_section)
798 S_SET_SEGMENT (symp, absolute_section);
799 resolved = (symp->sy_value.X_add_symbol->sy_resolved
800 && symp->sy_value.X_op_symbol->sy_resolved);
806 /* Give an error (below) if not in expr_section. We don't
807 want to worry about expr_section symbols, because they
808 are fictional (they are created as part of expression
809 resolution), and any problems may not actually mean
815 /* Don't worry if we can't resolve an expr_section symbol. */
817 symp->sy_resolved = 1;
818 else if (S_GET_SEGMENT (symp) != expr_section)
820 as_bad ("can't resolve value for symbol \"%s\"", S_GET_NAME (symp));
821 symp->sy_resolved = 1;
825 /* Dollar labels look like a number followed by a dollar sign. Eg, "42$".
826 They are *really* local. That is, they go out of scope whenever we see a
827 label that isn't local. Also, like fb labels, there can be multiple
828 instances of a dollar label. Therefor, we name encode each instance with
829 the instance number, keep a list of defined symbols separate from the real
830 symbol table, and we treat these buggers as a sparse array. */
832 static long *dollar_labels;
833 static long *dollar_label_instances;
834 static char *dollar_label_defines;
835 static long dollar_label_count;
836 static unsigned long dollar_label_max;
839 dollar_label_defined (label)
844 know ((dollar_labels != NULL) || (dollar_label_count == 0));
846 for (i = dollar_labels; i < dollar_labels + dollar_label_count; ++i)
848 return dollar_label_defines[i - dollar_labels];
850 /* if we get here, label isn't defined */
852 } /* dollar_label_defined() */
855 dollar_label_instance (label)
860 know ((dollar_labels != NULL) || (dollar_label_count == 0));
862 for (i = dollar_labels; i < dollar_labels + dollar_label_count; ++i)
864 return (dollar_label_instances[i - dollar_labels]);
866 /* If we get here, we haven't seen the label before, therefore its instance
872 dollar_label_clear ()
874 memset (dollar_label_defines, '\0', (unsigned int) dollar_label_count);
877 #define DOLLAR_LABEL_BUMP_BY 10
880 define_dollar_label (label)
885 for (i = dollar_labels; i < dollar_labels + dollar_label_count; ++i)
888 ++dollar_label_instances[i - dollar_labels];
889 dollar_label_defines[i - dollar_labels] = 1;
893 /* if we get to here, we don't have label listed yet. */
895 if (dollar_labels == NULL)
897 dollar_labels = (long *) xmalloc (DOLLAR_LABEL_BUMP_BY * sizeof (long));
898 dollar_label_instances = (long *) xmalloc (DOLLAR_LABEL_BUMP_BY * sizeof (long));
899 dollar_label_defines = xmalloc (DOLLAR_LABEL_BUMP_BY);
900 dollar_label_max = DOLLAR_LABEL_BUMP_BY;
901 dollar_label_count = 0;
903 else if (dollar_label_count == dollar_label_max)
905 dollar_label_max += DOLLAR_LABEL_BUMP_BY;
906 dollar_labels = (long *) xrealloc ((char *) dollar_labels,
907 dollar_label_max * sizeof (long));
908 dollar_label_instances = (long *) xrealloc ((char *) dollar_label_instances,
909 dollar_label_max * sizeof (long));
910 dollar_label_defines = xrealloc (dollar_label_defines, dollar_label_max);
911 } /* if we needed to grow */
913 dollar_labels[dollar_label_count] = label;
914 dollar_label_instances[dollar_label_count] = 1;
915 dollar_label_defines[dollar_label_count] = 1;
916 ++dollar_label_count;
920 * dollar_label_name()
922 * Caller must copy returned name: we re-use the area for the next name.
924 * The mth occurence of label n: is turned into the symbol "Ln^Am"
925 * where n is the label number and m is the instance number. "L" makes
926 * it a label discarded unless debugging and "^A"('\1') ensures no
927 * ordinary symbol SHOULD get the same name as a local label
928 * symbol. The first "4:" is "L4^A1" - the m numbers begin at 1.
930 * fb labels get the same treatment, except that ^B is used in place of ^A.
933 char * /* Return local label name. */
934 dollar_label_name (n, augend)
935 register long n; /* we just saw "n$:" : n a number */
936 register int augend; /* 0 for current instance, 1 for new instance */
939 /* Returned to caller, then copied. used for created names ("4f") */
940 static char symbol_name_build[24];
943 char symbol_name_temporary[20]; /* build up a number, BACKWARDS */
946 know (augend == 0 || augend == 1);
947 p = symbol_name_build;
950 /* Next code just does sprintf( {}, "%d", n); */
952 q = symbol_name_temporary;
953 for (*q++ = 0, i = n; i; ++q)
958 while ((*p = *--q) != '\0')
963 /* instance number */
964 q = symbol_name_temporary;
965 for (*q++ = 0, i = dollar_label_instance (n) + augend; i; ++q)
970 while ((*p++ = *--q) != '\0');;
972 /* The label, as a '\0' ended string, starts at symbol_name_build. */
973 return symbol_name_build;
977 * Sombody else's idea of local labels. They are made by "n:" where n
978 * is any decimal digit. Refer to them with
979 * "nb" for previous (backward) n:
980 * or "nf" for next (forward) n:.
982 * We do a little better and let n be any number, not just a single digit, but
983 * since the other guy's assembler only does ten, we treat the first ten
986 * Like someone else's assembler, we have one set of local label counters for
987 * entire assembly, not one set per (sub)segment like in most assemblers. This
988 * implies that one can refer to a label in another segment, and indeed some
989 * crufty compilers have done just that.
991 * Since there could be a LOT of these things, treat them as a sparse array.
994 #define FB_LABEL_SPECIAL (10)
996 static long fb_low_counter[FB_LABEL_SPECIAL];
997 static long *fb_labels;
998 static long *fb_label_instances;
999 static long fb_label_count;
1000 static long fb_label_max;
1002 /* this must be more than FB_LABEL_SPECIAL */
1003 #define FB_LABEL_BUMP_BY (FB_LABEL_SPECIAL + 6)
1008 memset ((void *) fb_low_counter, '\0', sizeof (fb_low_counter));
1009 } /* fb_label_init() */
1011 /* add one to the instance number of this fb label */
1013 fb_label_instance_inc (label)
1018 if (label < FB_LABEL_SPECIAL)
1020 ++fb_low_counter[label];
1024 if (fb_labels != NULL)
1026 for (i = fb_labels + FB_LABEL_SPECIAL;
1027 i < fb_labels + fb_label_count; ++i)
1031 ++fb_label_instances[i - fb_labels];
1033 } /* if we find it */
1034 } /* for each existing label */
1037 /* if we get to here, we don't have label listed yet. */
1039 if (fb_labels == NULL)
1041 fb_labels = (long *) xmalloc (FB_LABEL_BUMP_BY * sizeof (long));
1042 fb_label_instances = (long *) xmalloc (FB_LABEL_BUMP_BY * sizeof (long));
1043 fb_label_max = FB_LABEL_BUMP_BY;
1044 fb_label_count = FB_LABEL_SPECIAL;
1047 else if (fb_label_count == fb_label_max)
1049 fb_label_max += FB_LABEL_BUMP_BY;
1050 fb_labels = (long *) xrealloc ((char *) fb_labels,
1051 fb_label_max * sizeof (long));
1052 fb_label_instances = (long *) xrealloc ((char *) fb_label_instances,
1053 fb_label_max * sizeof (long));
1054 } /* if we needed to grow */
1056 fb_labels[fb_label_count] = label;
1057 fb_label_instances[fb_label_count] = 1;
1062 fb_label_instance (label)
1067 if (label < FB_LABEL_SPECIAL)
1069 return (fb_low_counter[label]);
1072 if (fb_labels != NULL)
1074 for (i = fb_labels + FB_LABEL_SPECIAL;
1075 i < fb_labels + fb_label_count; ++i)
1079 return (fb_label_instances[i - fb_labels]);
1080 } /* if we find it */
1081 } /* for each existing label */
1084 /* We didn't find the label, so this must be a reference to the
1092 * Caller must copy returned name: we re-use the area for the next name.
1094 * The mth occurence of label n: is turned into the symbol "Ln^Bm"
1095 * where n is the label number and m is the instance number. "L" makes
1096 * it a label discarded unless debugging and "^B"('\2') ensures no
1097 * ordinary symbol SHOULD get the same name as a local label
1098 * symbol. The first "4:" is "L4^B1" - the m numbers begin at 1.
1100 * dollar labels get the same treatment, except that ^A is used in place of ^B. */
1102 char * /* Return local label name. */
1103 fb_label_name (n, augend)
1104 long n; /* we just saw "n:", "nf" or "nb" : n a number */
1105 long augend; /* 0 for nb, 1 for n:, nf */
1108 /* Returned to caller, then copied. used for created names ("4f") */
1109 static char symbol_name_build[24];
1112 char symbol_name_temporary[20]; /* build up a number, BACKWARDS */
1115 know (augend == 0 || augend == 1);
1116 p = symbol_name_build;
1119 /* Next code just does sprintf( {}, "%d", n); */
1121 q = symbol_name_temporary;
1122 for (*q++ = 0, i = n; i; ++q)
1127 while ((*p = *--q) != '\0')
1132 /* instance number */
1133 q = symbol_name_temporary;
1134 for (*q++ = 0, i = fb_label_instance (n) + augend; i; ++q)
1139 while ((*p++ = *--q) != '\0');;
1141 /* The label, as a '\0' ended string, starts at symbol_name_build. */
1142 return (symbol_name_build);
1143 } /* fb_label_name() */
1146 * decode name that may have been generated by foo_label_name() above. If
1147 * the name wasn't generated by foo_label_name(), then return it unaltered.
1148 * This is used for error messages.
1152 decode_local_label_name (s)
1156 char *symbol_decode;
1158 int instance_number;
1160 const char *message_format = "\"%d\" (instance number %d of a %s label)";
1165 for (label_number = 0, p = s + 1; isdigit (*p); ++p)
1166 label_number = (10 * label_number) + *p - '0';
1175 for (instance_number = 0, p++; isdigit (*p); ++p)
1176 instance_number = (10 * instance_number) + *p - '0';
1178 symbol_decode = obstack_alloc (¬es, strlen (message_format) + 30);
1179 sprintf (symbol_decode, message_format, label_number, instance_number, type);
1181 return symbol_decode;
1184 /* Get the value of a symbol. */
1190 if (!s->sy_resolved && !s->sy_resolving && s->sy_value.X_op != O_constant)
1191 resolve_symbol_value (s);
1192 if (s->sy_value.X_op != O_constant)
1193 as_bad ("Attempt to get value of unresolved symbol %s", S_GET_NAME (s));
1194 return (valueT) s->sy_value.X_add_number;
1197 /* Set the value of a symbol. */
1200 S_SET_VALUE (s, val)
1204 s->sy_value.X_op = O_constant;
1205 s->sy_value.X_add_number = (offsetT) val;
1206 s->sy_value.X_unsigned = 0;
1210 copy_symbol_attributes (dest, src)
1211 symbolS *dest, *src;
1213 #ifdef BFD_ASSEMBLER
1214 /* In an expression, transfer the settings of these flags.
1215 The user can override later, of course. */
1216 #define COPIED_SYMFLAGS (BSF_FUNCTION)
1217 dest->bsym->flags |= src->bsym->flags & COPIED_SYMFLAGS;
1220 #ifdef OBJ_COPY_SYMBOL_ATTRIBUTES
1221 OBJ_COPY_SYMBOL_ATTRIBUTES (dest, src);
1225 #ifdef BFD_ASSEMBLER
1231 flagword flags = s->bsym->flags;
1234 if (flags & BSF_LOCAL && flags & BSF_GLOBAL)
1237 return (flags & BSF_GLOBAL) != 0;
1244 return bfd_is_com_section (s->bsym->section);
1251 return s->bsym->section != undefined_section;
1258 if (s->bsym->flags & BSF_DEBUGGING)
1267 flagword flags = s->bsym->flags;
1271 if (flags & BSF_LOCAL && flags & BSF_GLOBAL)
1274 name = S_GET_NAME (s);
1275 return (name != NULL
1277 && (strchr (name, '\001')
1278 || strchr (name, '\002')
1279 || (! flag_keep_locals
1280 && (LOCAL_LABEL (name)
1283 && name[1] == '?')))));
1290 return S_IS_EXTERNAL (s);
1297 return S_GET_NAME (s) == 0;
1304 return s->bsym->name;
1311 return s->bsym->section;
1315 S_SET_SEGMENT (s, seg)
1319 s->bsym->section = seg;
1326 if ((s->bsym->flags & BSF_WEAK) != 0)
1327 as_warn ("%s already declared as weak", S_GET_NAME (s));
1328 s->bsym->flags |= BSF_GLOBAL;
1329 s->bsym->flags &= ~(BSF_LOCAL|BSF_WEAK);
1333 S_CLEAR_EXTERNAL (s)
1336 if ((s->bsym->flags & BSF_WEAK) != 0)
1337 as_warn ("%s already declared as weak", S_GET_NAME (s));
1338 s->bsym->flags |= BSF_LOCAL;
1339 s->bsym->flags &= ~(BSF_GLOBAL|BSF_WEAK);
1346 if ((s->bsym->flags & BSF_GLOBAL) != 0)
1347 as_warn ("%s already declared as global", S_GET_NAME (s));
1348 s->bsym->flags |= BSF_WEAK;
1349 s->bsym->flags &= ~(BSF_GLOBAL|BSF_LOCAL);
1353 S_SET_NAME (s, name)
1357 s->bsym->name = name;
1359 #endif /* BFD_ASSEMBLER */
1364 symbol_lastP = NULL;
1365 symbol_rootP = NULL; /* In case we have 0 symbols (!!) */
1366 sy_hash = hash_new ();
1368 memset ((char *) (&abs_symbol), '\0', sizeof (abs_symbol));
1369 #ifdef BFD_ASSEMBLER
1370 #if defined (EMIT_SECTION_SYMBOLS) || !defined (RELOC_REQUIRES_SYMBOL)
1371 abs_symbol.bsym = bfd_abs_section.symbol;
1374 /* Can't initialise a union. Sigh. */
1375 S_SET_SEGMENT (&abs_symbol, absolute_section);
1377 abs_symbol.sy_value.X_op = O_constant;
1378 abs_symbol.sy_frag = &zero_address_frag;
1380 if (LOCAL_LABELS_FB)
1392 printf ("%*s", indent_level * 4, "");
1397 void print_expr_1 PARAMS ((FILE *, expressionS *));
1398 void print_symbol_value_1 PARAMS ((FILE *, symbolS *));
1401 print_symbol_value_1 (file, sym)
1405 const char *name = S_GET_NAME (sym);
1406 if (!name || !name[0])
1408 fprintf (file, "sym %lx %s", (unsigned long) sym, name);
1409 if (sym->sy_frag != &zero_address_frag)
1410 fprintf (file, " frag %lx", (long) sym->sy_frag);
1412 fprintf (file, " written");
1413 if (sym->sy_resolved)
1414 fprintf (file, " resolved");
1415 else if (sym->sy_resolving)
1416 fprintf (file, " resolving");
1417 if (sym->sy_used_in_reloc)
1418 fprintf (file, " used-in-reloc");
1420 fprintf (file, " used");
1421 if (S_IS_LOCAL (sym))
1422 fprintf (file, " local");
1423 if (S_IS_EXTERN (sym))
1424 fprintf (file, " extern");
1425 if (S_IS_DEBUG (sym))
1426 fprintf (file, " debug");
1427 if (S_IS_DEFINED (sym))
1428 fprintf (file, " defined");
1429 fprintf (file, " %s", segment_name (S_GET_SEGMENT (sym)));
1430 if (sym->sy_resolved)
1432 segT s = S_GET_SEGMENT (sym);
1434 if (s != undefined_section
1435 && s != expr_section)
1436 fprintf (file, " %lx", (long) S_GET_VALUE (sym));
1438 else if (indent_level < 8 && S_GET_SEGMENT (sym) != undefined_section)
1441 fprintf (file, "\n%*s<", indent_level * 4, "");
1442 print_expr_1 (file, &sym->sy_value);
1443 fprintf (file, ">");
1450 print_symbol_value (sym)
1454 print_symbol_value_1 (stderr, sym);
1455 fprintf (stderr, "\n");
1459 print_expr_1 (file, exp)
1463 fprintf (file, "expr %lx ", (long) exp);
1467 fprintf (file, "illegal");
1470 fprintf (file, "absent");
1473 fprintf (file, "constant %lx", (long) exp->X_add_number);
1477 fprintf (file, "symbol\n%*s<", indent_level * 4, "");
1478 print_symbol_value_1 (file, exp->X_add_symbol);
1479 fprintf (file, ">");
1481 if (exp->X_add_number)
1482 fprintf (file, "\n%*s%lx", indent_level * 4, "",
1483 (long) exp->X_add_number);
1487 fprintf (file, "register #%d", (int) exp->X_add_number);
1490 fprintf (file, "big");
1493 fprintf (file, "uminus -<");
1495 print_symbol_value_1 (file, exp->X_add_symbol);
1496 fprintf (file, ">");
1497 goto maybe_print_addnum;
1499 fprintf (file, "bit_not");
1502 fprintf (file, "multiply");
1505 fprintf (file, "divide");
1508 fprintf (file, "modulus");
1511 fprintf (file, "lshift");
1514 fprintf (file, "rshift");
1516 case O_bit_inclusive_or:
1517 fprintf (file, "bit_ior");
1519 case O_bit_exclusive_or:
1520 fprintf (file, "bit_xor");
1523 fprintf (file, "bit_and");
1526 fprintf (file, "eq");
1529 fprintf (file, "ne");
1532 fprintf (file, "lt");
1535 fprintf (file, "le");
1538 fprintf (file, "ge");
1541 fprintf (file, "gt");
1545 fprintf (file, "add\n%*s<", indent_level * 4, "");
1546 print_symbol_value_1 (file, exp->X_add_symbol);
1547 fprintf (file, ">\n%*s<", indent_level * 4, "");
1548 print_symbol_value_1 (file, exp->X_op_symbol);
1549 fprintf (file, ">");
1550 goto maybe_print_addnum;
1553 fprintf (file, "subtract\n%*s<", indent_level * 4, "");
1554 print_symbol_value_1 (file, exp->X_add_symbol);
1555 fprintf (file, ">\n%*s<", indent_level * 4, "");
1556 print_symbol_value_1 (file, exp->X_op_symbol);
1557 fprintf (file, ">");
1558 goto maybe_print_addnum;
1560 fprintf (file, "{unknown opcode %d}", (int) exp->X_op);
1570 print_expr_1 (stderr, exp);
1571 fprintf (stderr, "\n");
1574 /* end of symbols.c */