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, 675 Mass Ave, Cambridge, MA 02139, USA. */
21 /* #define DEBUG_SYMS / * to debug symbol list maintenance */
27 #include "obstack.h" /* For "symbols.h" */
30 #ifndef WORKING_DOT_WORD
31 extern int new_broken_words
;
34 /* symbol-name => struct symbol pointer */
35 static struct hash_control
*sy_hash
;
37 /* Below are commented in "symbols.h". */
38 symbolS
*symbol_rootP
;
39 symbolS
*symbol_lastP
;
43 #define debug_verify_symchain verify_symbol_chain
45 #define debug_verify_symchain (void)
50 static void fb_label_init
PARAMS ((void));
54 Return a pointer to a new symbol. Die if we can't make a new
55 symbol. Fill in the symbol's values. Add symbol to end of symbol
58 This function should be called in the general case of creating a
59 symbol. However, if the output file symbol table has already been
60 set, and you are certain that this symbol won't be wanted in the
61 output file, you can call symbol_create. */
64 symbol_new (name
, segment
, valu
, frag
)
70 symbolS
*symbolP
= symbol_create (name
, segment
, valu
, frag
);
73 * Link to end of symbol chain.
77 extern int symbol_table_frozen
;
78 if (symbol_table_frozen
)
82 symbol_append (symbolP
, symbol_lastP
, &symbol_rootP
, &symbol_lastP
);
83 debug_verify_symchain (symbol_rootP
, symbol_lastP
);
89 symbol_create (name
, segment
, valu
, frag
)
90 const char *name
; /* It is copied, the caller can destroy/modify */
91 segT segment
; /* Segment identifier (SEG_<something>) */
92 valueT valu
; /* Symbol value */
93 fragS
*frag
; /* Associated fragment */
95 unsigned int name_length
;
96 char *preserved_copy_of_name
;
99 name_length
= strlen (name
) + 1; /* +1 for \0 */
100 obstack_grow (¬es
, name
, name_length
);
101 preserved_copy_of_name
= obstack_finish (¬es
);
102 #ifdef STRIP_UNDERSCORE
103 if (preserved_copy_of_name
[0] == '_')
104 preserved_copy_of_name
++;
107 #ifdef tc_canonicalize_symbol_name
108 preserved_copy_of_name
=
109 tc_canonicalize_symbol_name (preserved_copy_of_name
);
112 symbolP
= (symbolS
*) obstack_alloc (¬es
, sizeof (symbolS
));
114 /* symbol must be born in some fixed state. This seems as good as any. */
115 memset (symbolP
, 0, sizeof (symbolS
));
118 symbolP
->bsym
= bfd_make_empty_symbol (stdoutput
);
119 assert (symbolP
->bsym
!= 0);
120 symbolP
->bsym
->udata
.p
= (PTR
) symbolP
;
122 S_SET_NAME (symbolP
, preserved_copy_of_name
);
124 S_SET_SEGMENT (symbolP
, segment
);
125 S_SET_VALUE (symbolP
, valu
);
126 symbol_clear_list_pointers (symbolP
);
128 symbolP
->sy_frag
= frag
;
129 #ifndef BFD_ASSEMBLER
130 symbolP
->sy_number
= ~0;
131 symbolP
->sy_name_offset
= (unsigned int) ~0;
134 obj_symbol_new_hook (symbolP
);
136 #ifdef tc_symbol_new_hook
137 tc_symbol_new_hook (symbolP
);
147 * We have just seen "<name>:".
148 * Creates a struct symbol unless it already exists.
150 * Gripes if we are redefining a symbol incompatibly (and ignores it).
154 colon (sym_name
) /* just seen "x:" - rattle symbols & frags */
155 register char *sym_name
; /* symbol name, as a cannonical string */
156 /* We copy this string: OK to alter later. */
158 register symbolS
*symbolP
; /* symbol we are working with */
160 #ifdef LOCAL_LABELS_DOLLAR
161 /* Sun local labels go out of scope whenever a non-local symbol is
164 if (*sym_name
!= 'L')
165 dollar_label_clear ();
166 #endif /* LOCAL_LABELS_DOLLAR */
168 #ifndef WORKING_DOT_WORD
169 if (new_broken_words
)
171 struct broken_word
*a
;
176 extern const int md_short_jump_size
;
177 extern const int md_long_jump_size
;
178 possible_bytes
= (md_short_jump_size
179 + new_broken_words
* md_long_jump_size
);
182 frag_opcode
= frag_var (rs_broken_word
,
186 (symbolS
*) broken_words
,
190 /* We want to store the pointer to where to insert the jump table in the
191 fr_opcode of the rs_broken_word frag. This requires a little
194 && (frag_tmp
->fr_type
!= rs_broken_word
195 || frag_tmp
->fr_opcode
))
196 frag_tmp
= frag_tmp
->fr_next
;
198 frag_tmp
->fr_opcode
= frag_opcode
;
199 new_broken_words
= 0;
201 for (a
= broken_words
; a
&& a
->dispfrag
== 0; a
= a
->next_broken_word
)
202 a
->dispfrag
= frag_tmp
;
204 #endif /* WORKING_DOT_WORD */
206 if ((symbolP
= symbol_find (sym_name
)) != 0)
208 #ifdef RESOLVE_SYMBOL_REDEFINITION
209 if (RESOLVE_SYMBOL_REDEFINITION (symbolP
))
213 * Now check for undefined symbols
215 if (!S_IS_DEFINED (symbolP
))
217 if (S_GET_VALUE (symbolP
) == 0)
219 symbolP
->sy_frag
= frag_now
;
221 S_GET_OTHER(symbolP
) = const_flag
;
223 S_SET_VALUE (symbolP
, (valueT
) frag_now_fix ());
224 S_SET_SEGMENT (symbolP
, now_seg
);
227 #endif /* if we have one, it better be zero. */
233 * There are still several cases to check:
234 * A .comm/.lcomm symbol being redefined as
235 * initialized data is OK
236 * A .comm/.lcomm symbol being redefined with
237 * a larger size is also OK
239 * This only used to be allowed on VMS gas, but Sun cc
240 * on the sparc also depends on it.
243 if (((!S_IS_DEBUG (symbolP
)
244 && !S_IS_DEFINED (symbolP
)
245 && S_IS_EXTERNAL (symbolP
))
246 || S_GET_SEGMENT (symbolP
) == bss_section
)
247 && (now_seg
== data_section
248 || now_seg
== S_GET_SEGMENT (symbolP
)))
251 * Select which of the 2 cases this is
253 if (now_seg
!= data_section
)
256 * New .comm for prev .comm symbol.
257 * If the new size is larger we just
258 * change its value. If the new size
259 * is smaller, we ignore this symbol
261 if (S_GET_VALUE (symbolP
)
262 < ((unsigned) frag_now_fix ()))
264 S_SET_VALUE (symbolP
, (valueT
) frag_now_fix ());
269 /* It is a .comm/.lcomm being converted to initialized
271 symbolP
->sy_frag
= frag_now
;
273 S_GET_OTHER(symbolP
) = const_flag
;
275 S_SET_VALUE (symbolP
, (valueT
) frag_now_fix ());
276 S_SET_SEGMENT (symbolP
, now_seg
); /* keep N_EXT bit */
281 #if defined (S_GET_OTHER) && defined (S_GET_DESC)
282 as_fatal ("Symbol \"%s\" is already defined as \"%s\"/%d.%d.%ld.",
284 segment_name (S_GET_SEGMENT (symbolP
)),
285 S_GET_OTHER (symbolP
), S_GET_DESC (symbolP
),
286 (long) S_GET_VALUE (symbolP
));
288 as_fatal ("Symbol \"%s\" is already defined as \"%s\"/%ld.",
290 segment_name (S_GET_SEGMENT (symbolP
)),
291 (long) S_GET_VALUE (symbolP
));
294 } /* if the undefined symbol has no value */
298 /* Don't blow up if the definition is the same */
299 if (!(frag_now
== symbolP
->sy_frag
300 && S_GET_VALUE (symbolP
) == frag_now_fix ()
301 && S_GET_SEGMENT (symbolP
) == now_seg
))
302 as_fatal ("Symbol %s already defined.", sym_name
);
303 } /* if this symbol is not yet defined */
308 symbolP
= symbol_new (sym_name
, now_seg
, (valueT
) frag_now_fix (),
311 S_SET_OTHER (symbolP
, const_flag
);
314 symbol_table_insert (symbolP
);
315 } /* if we have seen this symbol before */
318 tc_frob_label (symbolP
);
324 * symbol_table_insert()
326 * Die if we can't insert the symbol.
331 symbol_table_insert (symbolP
)
334 register const char *error_string
;
337 know (S_GET_NAME (symbolP
));
339 if ((error_string
= hash_jam (sy_hash
, S_GET_NAME (symbolP
), (PTR
) 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
== '_')
413 #ifdef tc_canonicalize_symbol_name
417 copy
= (char *) alloca (strlen (name
) + 1);
419 name
= tc_canonicalize_symbol_name (copy
);
423 return ((symbolS
*) hash_find (sy_hash
, name
));
427 * Once upon a time, symbols were kept in a singly linked list. At
428 * least coff needs to be able to rearrange them from time to time, for
429 * which a doubly linked list is much more convenient. Loic did these
430 * as macros which seemed dangerous to me so they're now functions.
434 /* Link symbol ADDME after symbol TARGET in the chain. */
436 symbol_append (addme
, target
, rootPP
, lastPP
)
444 know (*rootPP
== NULL
);
445 know (*lastPP
== NULL
);
449 } /* if the list is empty */
451 if (target
->sy_next
!= NULL
)
453 #ifdef SYMBOLS_NEED_BACKPOINTERS
454 target
->sy_next
->sy_previous
= addme
;
455 #endif /* SYMBOLS_NEED_BACKPOINTERS */
459 know (*lastPP
== target
);
461 } /* if we have a next */
463 addme
->sy_next
= target
->sy_next
;
464 target
->sy_next
= addme
;
466 #ifdef SYMBOLS_NEED_BACKPOINTERS
467 addme
->sy_previous
= target
;
468 #endif /* SYMBOLS_NEED_BACKPOINTERS */
471 /* Set the chain pointers of SYMBOL to null. */
473 symbol_clear_list_pointers (symbolP
)
476 symbolP
->sy_next
= NULL
;
477 #ifdef SYMBOLS_NEED_BACKPOINTERS
478 symbolP
->sy_previous
= NULL
;
482 #ifdef SYMBOLS_NEED_BACKPOINTERS
483 /* Remove SYMBOLP from the list. */
485 symbol_remove (symbolP
, rootPP
, lastPP
)
490 if (symbolP
== *rootPP
)
492 *rootPP
= symbolP
->sy_next
;
493 } /* if it was the root */
495 if (symbolP
== *lastPP
)
497 *lastPP
= symbolP
->sy_previous
;
498 } /* if it was the tail */
500 if (symbolP
->sy_next
!= NULL
)
502 symbolP
->sy_next
->sy_previous
= symbolP
->sy_previous
;
505 if (symbolP
->sy_previous
!= NULL
)
507 symbolP
->sy_previous
->sy_next
= symbolP
->sy_next
;
510 debug_verify_symchain (*rootPP
, *lastPP
);
513 /* Link symbol ADDME before symbol TARGET in the chain. */
515 symbol_insert (addme
, target
, rootPP
, lastPP
)
521 if (target
->sy_previous
!= NULL
)
523 target
->sy_previous
->sy_next
= addme
;
527 know (*rootPP
== target
);
531 addme
->sy_previous
= target
->sy_previous
;
532 target
->sy_previous
= addme
;
533 addme
->sy_next
= target
;
535 debug_verify_symchain (*rootPP
, *lastPP
);
538 #endif /* SYMBOLS_NEED_BACKPOINTERS */
541 verify_symbol_chain (rootP
, lastP
)
545 symbolS
*symbolP
= rootP
;
550 for (; symbol_next (symbolP
) != NULL
; symbolP
= symbol_next (symbolP
))
552 #ifdef SYMBOLS_NEED_BACKPOINTERS
553 know (symbolP
->sy_next
->sy_previous
== symbolP
);
555 /* Walk the list anyways, to make sure pointers are still good. */
557 #endif /* SYMBOLS_NEED_BACKPOINTERS */
560 assert (lastP
== symbolP
);
564 verify_symbol_chain_2 (sym
)
567 symbolS
*p
= sym
, *n
= sym
;
568 #ifdef SYMBOLS_NEED_BACKPOINTERS
569 while (symbol_previous (p
))
570 p
= symbol_previous (p
);
572 while (symbol_next (n
))
574 verify_symbol_chain (p
, n
);
577 /* Resolve the value of a symbol. This is called during the final
578 pass over the symbol table to resolve any symbols with complex
582 resolve_symbol_value (symp
)
587 if (symp
->sy_resolved
)
592 if (symp
->sy_resolving
)
594 as_bad ("Symbol definition loop encountered at %s",
596 S_SET_VALUE (symp
, (valueT
) 0);
601 offsetT left
, right
, val
;
602 segT seg_left
, seg_right
;
604 symp
->sy_resolving
= 1;
607 switch (symp
->sy_value
.X_op
)
610 S_SET_VALUE (symp
, 0);
613 S_SET_VALUE (symp
, S_GET_VALUE (symp
) + symp
->sy_frag
->fr_address
);
614 if (S_GET_SEGMENT (symp
) == expr_section
)
615 S_SET_SEGMENT (symp
, absolute_section
);
620 resolve_symbol_value (symp
->sy_value
.X_add_symbol
);
622 #if 0 /* I thought this was needed for some of the i386-svr4 PIC
623 support, but it appears I was wrong, and it breaks rs6000
625 if (S_GET_SEGMENT (symp
->sy_value
.X_add_symbol
) != undefined_section
626 && S_GET_SEGMENT (symp
->sy_value
.X_add_symbol
) != expr_section
)
629 if (symp
->sy_value
.X_add_number
== 0)
630 copy_symbol_attributes (symp
, symp
->sy_value
.X_add_symbol
);
633 (symp
->sy_value
.X_add_number
634 + symp
->sy_frag
->fr_address
635 + S_GET_VALUE (symp
->sy_value
.X_add_symbol
)));
636 if (S_GET_SEGMENT (symp
) == expr_section
637 || S_GET_SEGMENT (symp
) == undefined_section
)
639 S_GET_SEGMENT (symp
->sy_value
.X_add_symbol
));
641 resolved
= symp
->sy_value
.X_add_symbol
->sy_resolved
;
646 resolve_symbol_value (symp
->sy_value
.X_add_symbol
);
647 if (symp
->sy_value
.X_op
== O_uminus
)
648 val
= - S_GET_VALUE (symp
->sy_value
.X_add_symbol
);
650 val
= ~ S_GET_VALUE (symp
->sy_value
.X_add_symbol
);
653 + symp
->sy_value
.X_add_number
654 + symp
->sy_frag
->fr_address
));
655 if (S_GET_SEGMENT (symp
) == expr_section
656 || S_GET_SEGMENT (symp
) == undefined_section
)
657 S_SET_SEGMENT (symp
, absolute_section
);
658 resolved
= symp
->sy_value
.X_add_symbol
->sy_resolved
;
662 resolve_symbol_value (symp
->sy_value
.X_add_symbol
);
663 resolve_symbol_value (symp
->sy_value
.X_op_symbol
);
664 seg_left
= S_GET_SEGMENT (symp
->sy_value
.X_add_symbol
);
665 seg_right
= S_GET_SEGMENT (symp
->sy_value
.X_op_symbol
);
666 /* This case comes up with PIC support. */
668 symbolS
*s_left
= symp
->sy_value
.X_add_symbol
;
669 symbolS
*s_right
= symp
->sy_value
.X_op_symbol
;
671 if (seg_left
== absolute_section
)
679 seg_left
= seg_right
;
682 if (seg_right
== absolute_section
683 && s_right
->sy_resolved
)
685 symp
->sy_value
.X_add_number
+= S_GET_VALUE (s_right
);
686 symp
->sy_value
.X_op_symbol
= 0;
687 symp
->sy_value
.X_add_symbol
= s_left
;
688 symp
->sy_value
.X_op
= O_symbol
;
699 case O_bit_inclusive_or
:
701 case O_bit_exclusive_or
:
704 resolve_symbol_value (symp
->sy_value
.X_add_symbol
);
705 resolve_symbol_value (symp
->sy_value
.X_op_symbol
);
706 seg_left
= S_GET_SEGMENT (symp
->sy_value
.X_add_symbol
);
707 seg_right
= S_GET_SEGMENT (symp
->sy_value
.X_op_symbol
);
708 if (seg_left
!= seg_right
709 && seg_left
!= undefined_section
710 && seg_right
!= undefined_section
)
711 as_bad ("%s is operation on symbols in different sections",
713 if ((S_GET_SEGMENT (symp
->sy_value
.X_add_symbol
)
715 && symp
->sy_value
.X_op
!= O_subtract
)
716 as_bad ("%s is illegal operation on non-absolute symbols",
718 left
= S_GET_VALUE (symp
->sy_value
.X_add_symbol
);
719 right
= S_GET_VALUE (symp
->sy_value
.X_op_symbol
);
720 switch (symp
->sy_value
.X_op
)
722 case O_multiply
: val
= left
* right
; break;
723 case O_divide
: val
= left
/ right
; break;
724 case O_modulus
: val
= left
% right
; break;
725 case O_left_shift
: val
= left
<< right
; break;
726 case O_right_shift
: val
= left
>> right
; break;
727 case O_bit_inclusive_or
: val
= left
| right
; break;
728 case O_bit_or_not
: val
= left
|~ right
; break;
729 case O_bit_exclusive_or
: val
= left
^ right
; break;
730 case O_bit_and
: val
= left
& right
; break;
731 case O_add
: val
= left
+ right
; break;
732 case O_subtract
: val
= left
- right
; break;
736 (symp
->sy_value
.X_add_number
737 + symp
->sy_frag
->fr_address
739 if (S_GET_SEGMENT (symp
) == expr_section
740 || S_GET_SEGMENT (symp
) == undefined_section
)
741 S_SET_SEGMENT (symp
, absolute_section
);
742 resolved
= (symp
->sy_value
.X_add_symbol
->sy_resolved
743 && symp
->sy_value
.X_op_symbol
->sy_resolved
);
749 /* Give an error (below) if not in expr_section. We don't
750 want to worry about expr_section symbols, because they
751 are fictional (they are created as part of expression
752 resolution), and any problems may not actually mean
758 /* Don't worry if we can't resolve an expr_section symbol. */
760 symp
->sy_resolved
= 1;
761 else if (S_GET_SEGMENT (symp
) != expr_section
)
763 as_bad ("can't resolve value for symbol \"%s\"", S_GET_NAME (symp
));
764 symp
->sy_resolved
= 1;
768 #ifdef LOCAL_LABELS_DOLLAR
770 /* Dollar labels look like a number followed by a dollar sign. Eg, "42$".
771 They are *really* local. That is, they go out of scope whenever we see a
772 label that isn't local. Also, like fb labels, there can be multiple
773 instances of a dollar label. Therefor, we name encode each instance with
774 the instance number, keep a list of defined symbols separate from the real
775 symbol table, and we treat these buggers as a sparse array. */
777 static long *dollar_labels
;
778 static long *dollar_label_instances
;
779 static char *dollar_label_defines
;
780 static long dollar_label_count
;
781 static unsigned long dollar_label_max
;
784 dollar_label_defined (label
)
789 know ((dollar_labels
!= NULL
) || (dollar_label_count
== 0));
791 for (i
= dollar_labels
; i
< dollar_labels
+ dollar_label_count
; ++i
)
793 return dollar_label_defines
[i
- dollar_labels
];
795 /* if we get here, label isn't defined */
797 } /* dollar_label_defined() */
800 dollar_label_instance (label
)
805 know ((dollar_labels
!= NULL
) || (dollar_label_count
== 0));
807 for (i
= dollar_labels
; i
< dollar_labels
+ dollar_label_count
; ++i
)
809 return (dollar_label_instances
[i
- dollar_labels
]);
811 /* If we get here, we haven't seen the label before, therefore its instance
817 dollar_label_clear ()
819 memset (dollar_label_defines
, '\0', (unsigned int) dollar_label_count
);
822 #define DOLLAR_LABEL_BUMP_BY 10
825 define_dollar_label (label
)
830 for (i
= dollar_labels
; i
< dollar_labels
+ dollar_label_count
; ++i
)
833 ++dollar_label_instances
[i
- dollar_labels
];
834 dollar_label_defines
[i
- dollar_labels
] = 1;
838 /* if we get to here, we don't have label listed yet. */
840 if (dollar_labels
== NULL
)
842 dollar_labels
= (long *) xmalloc (DOLLAR_LABEL_BUMP_BY
* sizeof (long));
843 dollar_label_instances
= (long *) xmalloc (DOLLAR_LABEL_BUMP_BY
* sizeof (long));
844 dollar_label_defines
= xmalloc (DOLLAR_LABEL_BUMP_BY
);
845 dollar_label_max
= DOLLAR_LABEL_BUMP_BY
;
846 dollar_label_count
= 0;
848 else if (dollar_label_count
== dollar_label_max
)
850 dollar_label_max
+= DOLLAR_LABEL_BUMP_BY
;
851 dollar_labels
= (long *) xrealloc ((char *) dollar_labels
,
852 dollar_label_max
* sizeof (long));
853 dollar_label_instances
= (long *) xrealloc ((char *) dollar_label_instances
,
854 dollar_label_max
* sizeof (long));
855 dollar_label_defines
= xrealloc (dollar_label_defines
, dollar_label_max
);
856 } /* if we needed to grow */
858 dollar_labels
[dollar_label_count
] = label
;
859 dollar_label_instances
[dollar_label_count
] = 1;
860 dollar_label_defines
[dollar_label_count
] = 1;
861 ++dollar_label_count
;
865 * dollar_label_name()
867 * Caller must copy returned name: we re-use the area for the next name.
869 * The mth occurence of label n: is turned into the symbol "Ln^Am"
870 * where n is the label number and m is the instance number. "L" makes
871 * it a label discarded unless debugging and "^A"('\1') ensures no
872 * ordinary symbol SHOULD get the same name as a local label
873 * symbol. The first "4:" is "L4^A1" - the m numbers begin at 1.
875 * fb labels get the same treatment, except that ^B is used in place of ^A.
878 char * /* Return local label name. */
879 dollar_label_name (n
, augend
)
880 register long n
; /* we just saw "n$:" : n a number */
881 register int augend
; /* 0 for current instance, 1 for new instance */
884 /* Returned to caller, then copied. used for created names ("4f") */
885 static char symbol_name_build
[24];
888 char symbol_name_temporary
[20]; /* build up a number, BACKWARDS */
891 know (augend
== 0 || augend
== 1);
892 p
= symbol_name_build
;
895 /* Next code just does sprintf( {}, "%d", n); */
897 q
= symbol_name_temporary
;
898 for (*q
++ = 0, i
= n
; i
; ++q
)
903 while ((*p
= *--q
) != '\0')
908 /* instance number */
909 q
= symbol_name_temporary
;
910 for (*q
++ = 0, i
= dollar_label_instance (n
) + augend
; i
; ++q
)
915 while ((*p
++ = *--q
) != '\0');;
917 /* The label, as a '\0' ended string, starts at symbol_name_build. */
918 return symbol_name_build
;
921 #endif /* LOCAL_LABELS_DOLLAR */
923 #ifdef LOCAL_LABELS_FB
926 * Sombody else's idea of local labels. They are made by "n:" where n
927 * is any decimal digit. Refer to them with
928 * "nb" for previous (backward) n:
929 * or "nf" for next (forward) n:.
931 * We do a little better and let n be any number, not just a single digit, but
932 * since the other guy's assembler only does ten, we treat the first ten
935 * Like someone else's assembler, we have one set of local label counters for
936 * entire assembly, not one set per (sub)segment like in most assemblers. This
937 * implies that one can refer to a label in another segment, and indeed some
938 * crufty compilers have done just that.
940 * Since there could be a LOT of these things, treat them as a sparse array.
943 #define FB_LABEL_SPECIAL (10)
945 static long fb_low_counter
[FB_LABEL_SPECIAL
];
946 static long *fb_labels
;
947 static long *fb_label_instances
;
948 static long fb_label_count
;
949 static long fb_label_max
;
951 /* this must be more than FB_LABEL_SPECIAL */
952 #define FB_LABEL_BUMP_BY (FB_LABEL_SPECIAL + 6)
957 memset ((void *) fb_low_counter
, '\0', sizeof (fb_low_counter
));
958 } /* fb_label_init() */
960 /* add one to the instance number of this fb label */
962 fb_label_instance_inc (label
)
967 if (label
< FB_LABEL_SPECIAL
)
969 ++fb_low_counter
[label
];
973 if (fb_labels
!= NULL
)
975 for (i
= fb_labels
+ FB_LABEL_SPECIAL
;
976 i
< fb_labels
+ fb_label_count
; ++i
)
980 ++fb_label_instances
[i
- fb_labels
];
982 } /* if we find it */
983 } /* for each existing label */
986 /* if we get to here, we don't have label listed yet. */
988 if (fb_labels
== NULL
)
990 fb_labels
= (long *) xmalloc (FB_LABEL_BUMP_BY
* sizeof (long));
991 fb_label_instances
= (long *) xmalloc (FB_LABEL_BUMP_BY
* sizeof (long));
992 fb_label_max
= FB_LABEL_BUMP_BY
;
993 fb_label_count
= FB_LABEL_SPECIAL
;
996 else if (fb_label_count
== fb_label_max
)
998 fb_label_max
+= FB_LABEL_BUMP_BY
;
999 fb_labels
= (long *) xrealloc ((char *) fb_labels
,
1000 fb_label_max
* sizeof (long));
1001 fb_label_instances
= (long *) xrealloc ((char *) fb_label_instances
,
1002 fb_label_max
* sizeof (long));
1003 } /* if we needed to grow */
1005 fb_labels
[fb_label_count
] = label
;
1006 fb_label_instances
[fb_label_count
] = 1;
1011 fb_label_instance (label
)
1016 if (label
< FB_LABEL_SPECIAL
)
1018 return (fb_low_counter
[label
]);
1021 if (fb_labels
!= NULL
)
1023 for (i
= fb_labels
+ FB_LABEL_SPECIAL
;
1024 i
< fb_labels
+ fb_label_count
; ++i
)
1028 return (fb_label_instances
[i
- fb_labels
]);
1029 } /* if we find it */
1030 } /* for each existing label */
1033 /* We didn't find the label, so this must be a reference to the
1041 * Caller must copy returned name: we re-use the area for the next name.
1043 * The mth occurence of label n: is turned into the symbol "Ln^Bm"
1044 * where n is the label number and m is the instance number. "L" makes
1045 * it a label discarded unless debugging and "^B"('\2') ensures no
1046 * ordinary symbol SHOULD get the same name as a local label
1047 * symbol. The first "4:" is "L4^B1" - the m numbers begin at 1.
1049 * dollar labels get the same treatment, except that ^A is used in place of ^B. */
1051 char * /* Return local label name. */
1052 fb_label_name (n
, augend
)
1053 long n
; /* we just saw "n:", "nf" or "nb" : n a number */
1054 long augend
; /* 0 for nb, 1 for n:, nf */
1057 /* Returned to caller, then copied. used for created names ("4f") */
1058 static char symbol_name_build
[24];
1061 char symbol_name_temporary
[20]; /* build up a number, BACKWARDS */
1064 know (augend
== 0 || augend
== 1);
1065 p
= symbol_name_build
;
1068 /* Next code just does sprintf( {}, "%d", n); */
1070 q
= symbol_name_temporary
;
1071 for (*q
++ = 0, i
= n
; i
; ++q
)
1076 while ((*p
= *--q
) != '\0')
1081 /* instance number */
1082 q
= symbol_name_temporary
;
1083 for (*q
++ = 0, i
= fb_label_instance (n
) + augend
; i
; ++q
)
1088 while ((*p
++ = *--q
) != '\0');;
1090 /* The label, as a '\0' ended string, starts at symbol_name_build. */
1091 return (symbol_name_build
);
1092 } /* fb_label_name() */
1094 #endif /* LOCAL_LABELS_FB */
1098 * decode name that may have been generated by foo_label_name() above. If
1099 * the name wasn't generated by foo_label_name(), then return it unaltered.
1100 * This is used for error messages.
1104 decode_local_label_name (s
)
1108 char *symbol_decode
;
1110 int instance_number
;
1112 const char *message_format
= "\"%d\" (instance number %d of a %s label)";
1117 for (label_number
= 0, p
= s
+ 1; isdigit (*p
); ++p
)
1119 label_number
= (10 * label_number
) + *p
- '0';
1135 for (instance_number
= 0, p
= s
+ 1; isdigit (*p
); ++p
)
1137 instance_number
= (10 * instance_number
) + *p
- '0';
1140 symbol_decode
= obstack_alloc (¬es
, strlen (message_format
) + 30);
1141 (void) sprintf (symbol_decode
, message_format
, label_number
,
1142 instance_number
, type
);
1144 return (symbol_decode
);
1145 } /* decode_local_label_name() */
1147 /* Get the value of a symbol. */
1153 if (!s
->sy_resolved
&& !s
->sy_resolving
&& s
->sy_value
.X_op
!= O_constant
)
1154 resolve_symbol_value (s
);
1155 if (s
->sy_value
.X_op
!= O_constant
)
1156 as_bad ("Attempt to get value of unresolved symbol %s", S_GET_NAME (s
));
1157 return (valueT
) s
->sy_value
.X_add_number
;
1160 /* Set the value of a symbol. */
1163 S_SET_VALUE (s
, val
)
1167 s
->sy_value
.X_op
= O_constant
;
1168 s
->sy_value
.X_add_number
= (offsetT
) val
;
1169 s
->sy_value
.X_unsigned
= 0;
1173 copy_symbol_attributes (dest
, src
)
1174 symbolS
*dest
, *src
;
1176 #ifdef BFD_ASSEMBLER
1177 /* In an expression, transfer the settings of these flags.
1178 The user can override later, of course. */
1179 #define COPIED_SYMFLAGS (BSF_FUNCTION)
1180 dest
->bsym
->flags
|= src
->bsym
->flags
& COPIED_SYMFLAGS
;
1183 #ifdef OBJ_COPY_SYMBOL_ATTRIBUTES
1184 OBJ_COPY_SYMBOL_ATTRIBUTES (dest
, src
);
1188 #ifdef BFD_ASSEMBLER
1194 flagword flags
= s
->bsym
->flags
;
1197 if (flags
& BSF_LOCAL
&& flags
& BSF_GLOBAL
)
1200 return (flags
& BSF_GLOBAL
) != 0;
1207 return bfd_is_com_section (s
->bsym
->section
);
1214 return s
->bsym
->section
!= undefined_section
;
1221 if (s
->bsym
->flags
& BSF_DEBUGGING
)
1230 flagword flags
= s
->bsym
->flags
;
1233 if (flags
& BSF_LOCAL
&& flags
& BSF_GLOBAL
)
1236 return (S_GET_NAME (s
)
1238 && (strchr (S_GET_NAME (s
), '\001')
1239 || strchr (S_GET_NAME (s
), '\002')
1240 || (S_LOCAL_NAME (s
)
1241 && !flag_keep_locals
)));
1248 return S_IS_EXTERNAL (s
);
1255 return S_GET_NAME (s
) == 0;
1262 return s
->bsym
->name
;
1269 return s
->bsym
->section
;
1273 S_SET_SEGMENT (s
, seg
)
1277 s
->bsym
->section
= seg
;
1284 s
->bsym
->flags
|= BSF_GLOBAL
;
1285 s
->bsym
->flags
&= ~(BSF_LOCAL
|BSF_WEAK
);
1289 S_CLEAR_EXTERNAL (s
)
1292 s
->bsym
->flags
|= BSF_LOCAL
;
1293 s
->bsym
->flags
&= ~(BSF_GLOBAL
|BSF_WEAK
);
1300 s
->bsym
->flags
|= BSF_WEAK
;
1301 s
->bsym
->flags
&= ~(BSF_GLOBAL
|BSF_LOCAL
);
1305 S_SET_NAME (s
, name
)
1309 s
->bsym
->name
= name
;
1311 #endif /* BFD_ASSEMBLER */
1316 symbol_lastP
= NULL
;
1317 symbol_rootP
= NULL
; /* In case we have 0 symbols (!!) */
1318 sy_hash
= hash_new ();
1320 memset ((char *) (&abs_symbol
), '\0', sizeof (abs_symbol
));
1321 #ifdef BFD_ASSEMBLER
1322 #if defined (EMIT_SECTION_SYMBOLS) || !defined (RELOC_REQUIRES_SYMBOL)
1323 abs_symbol
.bsym
= bfd_abs_section
.symbol
;
1326 /* Can't initialise a union. Sigh. */
1327 S_SET_SEGMENT (&abs_symbol
, absolute_section
);
1329 abs_symbol
.sy_value
.X_op
= O_constant
;
1331 #ifdef LOCAL_LABELS_FB
1333 #endif /* LOCAL_LABELS_FB */
1342 printf ("%*s", indent_level
* 4, "");
1345 void print_expr_1
PARAMS ((FILE *, expressionS
*));
1346 void print_symbol_value_1
PARAMS ((FILE *, symbolS
*));
1349 print_symbol_value_1 (file
, sym
)
1353 const char *name
= S_GET_NAME (sym
);
1354 if (!name
|| !name
[0])
1356 fprintf (file
, "sym %lx %s", sym
, name
);
1357 if (sym
->sy_frag
!= &zero_address_frag
)
1358 fprintf (file
, " frag %lx", (long) sym
->sy_frag
);
1360 fprintf (file
, " written");
1361 if (sym
->sy_resolved
)
1362 fprintf (file
, " resolved");
1363 else if (sym
->sy_resolving
)
1364 fprintf (file
, " resolving");
1365 if (sym
->sy_used_in_reloc
)
1366 fprintf (file
, " used-in-reloc");
1368 fprintf (file
, " used");
1369 if (S_IS_LOCAL (sym
))
1370 fprintf (file
, " local");
1371 if (S_IS_EXTERN (sym
))
1372 fprintf (file
, " extern");
1373 if (S_IS_DEBUG (sym
))
1374 fprintf (file
, " debug");
1375 if (S_IS_DEFINED (sym
))
1376 fprintf (file
, " defined");
1377 fprintf (file
, " %s", segment_name (S_GET_SEGMENT (sym
)));
1378 if (sym
->sy_resolved
)
1380 segT s
= S_GET_SEGMENT (sym
);
1382 if (s
!= undefined_section
1383 && s
!= expr_section
)
1384 fprintf (file
, " %lx", (long) S_GET_VALUE (sym
));
1386 else if (indent_level
< 8 && S_GET_SEGMENT (sym
) != undefined_section
)
1389 fprintf (file
, "\n%*s<", indent_level
* 4, "");
1390 print_expr_1 (file
, &sym
->sy_value
);
1391 fprintf (file
, ">");
1398 print_symbol_value (sym
)
1402 print_symbol_value_1 (stderr
, sym
);
1403 fprintf (stderr
, "\n");
1407 print_expr_1 (file
, exp
)
1411 fprintf (file
, "expr %lx ", (long) exp
);
1415 fprintf (file
, "illegal");
1418 fprintf (file
, "absent");
1421 fprintf (file
, "constant %lx", (long) exp
->X_add_number
);
1425 fprintf (file
, "symbol\n%*s<", indent_level
* 4, "");
1426 print_symbol_value_1 (file
, exp
->X_add_symbol
);
1427 fprintf (file
, ">");
1429 if (exp
->X_add_number
)
1430 fprintf (file
, "\n%*s%lx", indent_level
* 4, "",
1431 (long) exp
->X_add_number
);
1435 fprintf (file
, "register #%d", (int) exp
->X_add_number
);
1438 fprintf (file
, "big");
1441 fprintf (file
, "uminus -<");
1443 print_symbol_value_1 (file
, exp
->X_add_symbol
);
1444 fprintf (file
, ">");
1445 goto maybe_print_addnum
;
1447 fprintf (file
, "bit_not");
1450 fprintf (file
, "multiply");
1453 fprintf (file
, "divide");
1456 fprintf (file
, "modulus");
1459 fprintf (file
, "lshift");
1462 fprintf (file
, "rshift");
1464 case O_bit_inclusive_or
:
1465 fprintf (file
, "bit_ior");
1467 case O_bit_exclusive_or
:
1468 fprintf (file
, "bit_xor");
1471 fprintf (file
, "bit_and");
1475 fprintf (file
, "add\n%*s<", indent_level
* 4, "");
1476 print_symbol_value_1 (file
, exp
->X_add_symbol
);
1477 fprintf (file
, ">\n%*s<", indent_level
* 4, "");
1478 print_symbol_value_1 (file
, exp
->X_op_symbol
);
1479 fprintf (file
, ">");
1480 goto maybe_print_addnum
;
1483 fprintf (file
, "subtract\n%*s<", indent_level
* 4, "");
1484 print_symbol_value_1 (file
, exp
->X_add_symbol
);
1485 fprintf (file
, ">\n%*s<", indent_level
* 4, "");
1486 print_symbol_value_1 (file
, exp
->X_op_symbol
);
1487 fprintf (file
, ">");
1488 goto maybe_print_addnum
;
1490 fprintf (file
, "{unknown opcode %d}", (int) exp
->X_op
);
1500 print_expr_1 (stderr
, exp
);
1501 fprintf (stderr
, "\n");
1504 /* end of symbols.c */
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