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 /* Sun local labels go out of scope whenever a non-local symbol is
162 if (LOCAL_LABELS_DOLLAR
&& *sym_name
!= 'L')
163 dollar_label_clear ();
165 #ifndef WORKING_DOT_WORD
166 if (new_broken_words
)
168 struct broken_word
*a
;
173 extern const int md_short_jump_size
;
174 extern const int md_long_jump_size
;
175 possible_bytes
= (md_short_jump_size
176 + new_broken_words
* md_long_jump_size
);
179 frag_opcode
= frag_var (rs_broken_word
,
183 (symbolS
*) broken_words
,
187 /* We want to store the pointer to where to insert the jump table in the
188 fr_opcode of the rs_broken_word frag. This requires a little
191 && (frag_tmp
->fr_type
!= rs_broken_word
192 || frag_tmp
->fr_opcode
))
193 frag_tmp
= frag_tmp
->fr_next
;
195 frag_tmp
->fr_opcode
= frag_opcode
;
196 new_broken_words
= 0;
198 for (a
= broken_words
; a
&& a
->dispfrag
== 0; a
= a
->next_broken_word
)
199 a
->dispfrag
= frag_tmp
;
201 #endif /* WORKING_DOT_WORD */
203 if ((symbolP
= symbol_find (sym_name
)) != 0)
205 #ifdef RESOLVE_SYMBOL_REDEFINITION
206 if (RESOLVE_SYMBOL_REDEFINITION (symbolP
))
210 * Now check for undefined symbols
212 if (!S_IS_DEFINED (symbolP
))
214 if (S_GET_VALUE (symbolP
) == 0)
216 symbolP
->sy_frag
= frag_now
;
218 S_GET_OTHER(symbolP
) = const_flag
;
220 S_SET_VALUE (symbolP
, (valueT
) frag_now_fix ());
221 S_SET_SEGMENT (symbolP
, now_seg
);
224 #endif /* if we have one, it better be zero. */
230 * There are still several cases to check:
231 * A .comm/.lcomm symbol being redefined as
232 * initialized data is OK
233 * A .comm/.lcomm symbol being redefined with
234 * a larger size is also OK
236 * This only used to be allowed on VMS gas, but Sun cc
237 * on the sparc also depends on it.
240 if (((!S_IS_DEBUG (symbolP
)
241 && !S_IS_DEFINED (symbolP
)
242 && S_IS_EXTERNAL (symbolP
))
243 || S_GET_SEGMENT (symbolP
) == bss_section
)
244 && (now_seg
== data_section
245 || now_seg
== S_GET_SEGMENT (symbolP
)))
248 * Select which of the 2 cases this is
250 if (now_seg
!= data_section
)
253 * New .comm for prev .comm symbol.
254 * If the new size is larger we just
255 * change its value. If the new size
256 * is smaller, we ignore this symbol
258 if (S_GET_VALUE (symbolP
)
259 < ((unsigned) frag_now_fix ()))
261 S_SET_VALUE (symbolP
, (valueT
) frag_now_fix ());
266 /* It is a .comm/.lcomm being converted to initialized
268 symbolP
->sy_frag
= frag_now
;
270 S_GET_OTHER(symbolP
) = const_flag
;
272 S_SET_VALUE (symbolP
, (valueT
) frag_now_fix ());
273 S_SET_SEGMENT (symbolP
, now_seg
); /* keep N_EXT bit */
278 #if defined (S_GET_OTHER) && defined (S_GET_DESC)
279 as_fatal ("Symbol \"%s\" is already defined as \"%s\"/%d.%d.%ld.",
281 segment_name (S_GET_SEGMENT (symbolP
)),
282 S_GET_OTHER (symbolP
), S_GET_DESC (symbolP
),
283 (long) S_GET_VALUE (symbolP
));
285 as_fatal ("Symbol \"%s\" is already defined as \"%s\"/%ld.",
287 segment_name (S_GET_SEGMENT (symbolP
)),
288 (long) S_GET_VALUE (symbolP
));
291 } /* if the undefined symbol has no value */
295 /* Don't blow up if the definition is the same */
296 if (!(frag_now
== symbolP
->sy_frag
297 && S_GET_VALUE (symbolP
) == frag_now_fix ()
298 && S_GET_SEGMENT (symbolP
) == now_seg
))
299 as_fatal ("Symbol %s already defined.", sym_name
);
300 } /* if this symbol is not yet defined */
305 symbolP
= symbol_new (sym_name
, now_seg
, (valueT
) frag_now_fix (),
308 S_SET_OTHER (symbolP
, const_flag
);
311 symbol_table_insert (symbolP
);
312 } /* if we have seen this symbol before */
315 tc_frob_label (symbolP
);
321 * symbol_table_insert()
323 * Die if we can't insert the symbol.
328 symbol_table_insert (symbolP
)
331 register const char *error_string
;
334 know (S_GET_NAME (symbolP
));
336 if ((error_string
= hash_jam (sy_hash
, S_GET_NAME (symbolP
), (PTR
) symbolP
)))
338 as_fatal ("Inserting \"%s\" into symbol table failed: %s",
339 S_GET_NAME (symbolP
), error_string
);
341 } /* symbol_table_insert() */
344 * symbol_find_or_make()
346 * If a symbol name does not exist, create it as undefined, and insert
347 * it into the symbol table. Return a pointer to it.
350 symbol_find_or_make (name
)
353 register symbolS
*symbolP
;
355 symbolP
= symbol_find (name
);
359 symbolP
= symbol_make (name
);
361 symbol_table_insert (symbolP
);
362 } /* if symbol wasn't found */
365 } /* symbol_find_or_make() */
373 /* Let the machine description default it, e.g. for register names. */
374 symbolP
= md_undefined_symbol ((char *) name
);
377 symbolP
= symbol_new (name
, undefined_section
, (valueT
) 0, &zero_address_frag
);
380 } /* symbol_make() */
385 * Implement symbol table lookup.
386 * In: A symbol's name as a string: '\0' can't be part of a symbol name.
387 * Out: NULL if the name was not in the symbol table, else the address
388 * of a struct symbol associated with that name.
395 #ifdef STRIP_UNDERSCORE
396 return (symbol_find_base (name
, 1));
397 #else /* STRIP_UNDERSCORE */
398 return (symbol_find_base (name
, 0));
399 #endif /* STRIP_UNDERSCORE */
400 } /* symbol_find() */
403 symbol_find_base (name
, strip_underscore
)
405 int strip_underscore
;
407 if (strip_underscore
&& *name
== '_')
410 #ifdef tc_canonicalize_symbol_name
414 copy
= (char *) alloca (strlen (name
) + 1);
416 name
= tc_canonicalize_symbol_name (copy
);
420 return ((symbolS
*) hash_find (sy_hash
, name
));
424 * Once upon a time, symbols were kept in a singly linked list. At
425 * least coff needs to be able to rearrange them from time to time, for
426 * which a doubly linked list is much more convenient. Loic did these
427 * as macros which seemed dangerous to me so they're now functions.
431 /* Link symbol ADDME after symbol TARGET in the chain. */
433 symbol_append (addme
, target
, rootPP
, lastPP
)
441 know (*rootPP
== NULL
);
442 know (*lastPP
== NULL
);
446 } /* if the list is empty */
448 if (target
->sy_next
!= NULL
)
450 #ifdef SYMBOLS_NEED_BACKPOINTERS
451 target
->sy_next
->sy_previous
= addme
;
452 #endif /* SYMBOLS_NEED_BACKPOINTERS */
456 know (*lastPP
== target
);
458 } /* if we have a next */
460 addme
->sy_next
= target
->sy_next
;
461 target
->sy_next
= addme
;
463 #ifdef SYMBOLS_NEED_BACKPOINTERS
464 addme
->sy_previous
= target
;
465 #endif /* SYMBOLS_NEED_BACKPOINTERS */
468 /* Set the chain pointers of SYMBOL to null. */
470 symbol_clear_list_pointers (symbolP
)
473 symbolP
->sy_next
= NULL
;
474 #ifdef SYMBOLS_NEED_BACKPOINTERS
475 symbolP
->sy_previous
= NULL
;
479 #ifdef SYMBOLS_NEED_BACKPOINTERS
480 /* Remove SYMBOLP from the list. */
482 symbol_remove (symbolP
, rootPP
, lastPP
)
487 if (symbolP
== *rootPP
)
489 *rootPP
= symbolP
->sy_next
;
490 } /* if it was the root */
492 if (symbolP
== *lastPP
)
494 *lastPP
= symbolP
->sy_previous
;
495 } /* if it was the tail */
497 if (symbolP
->sy_next
!= NULL
)
499 symbolP
->sy_next
->sy_previous
= symbolP
->sy_previous
;
502 if (symbolP
->sy_previous
!= NULL
)
504 symbolP
->sy_previous
->sy_next
= symbolP
->sy_next
;
507 debug_verify_symchain (*rootPP
, *lastPP
);
510 /* Link symbol ADDME before symbol TARGET in the chain. */
512 symbol_insert (addme
, target
, rootPP
, lastPP
)
518 if (target
->sy_previous
!= NULL
)
520 target
->sy_previous
->sy_next
= addme
;
524 know (*rootPP
== target
);
528 addme
->sy_previous
= target
->sy_previous
;
529 target
->sy_previous
= addme
;
530 addme
->sy_next
= target
;
532 debug_verify_symchain (*rootPP
, *lastPP
);
535 #endif /* SYMBOLS_NEED_BACKPOINTERS */
538 verify_symbol_chain (rootP
, lastP
)
542 symbolS
*symbolP
= rootP
;
547 for (; symbol_next (symbolP
) != NULL
; symbolP
= symbol_next (symbolP
))
549 #ifdef SYMBOLS_NEED_BACKPOINTERS
550 know (symbolP
->sy_next
->sy_previous
== symbolP
);
552 /* Walk the list anyways, to make sure pointers are still good. */
554 #endif /* SYMBOLS_NEED_BACKPOINTERS */
557 assert (lastP
== symbolP
);
561 verify_symbol_chain_2 (sym
)
564 symbolS
*p
= sym
, *n
= sym
;
565 #ifdef SYMBOLS_NEED_BACKPOINTERS
566 while (symbol_previous (p
))
567 p
= symbol_previous (p
);
569 while (symbol_next (n
))
571 verify_symbol_chain (p
, n
);
574 /* Resolve the value of a symbol. This is called during the final
575 pass over the symbol table to resolve any symbols with complex
579 resolve_symbol_value (symp
)
584 if (symp
->sy_resolved
)
589 if (symp
->sy_resolving
)
591 as_bad ("Symbol definition loop encountered at %s",
593 S_SET_VALUE (symp
, (valueT
) 0);
598 offsetT left
, right
, val
;
599 segT seg_left
, seg_right
;
601 symp
->sy_resolving
= 1;
604 switch (symp
->sy_value
.X_op
)
607 S_SET_VALUE (symp
, 0);
610 S_SET_VALUE (symp
, S_GET_VALUE (symp
) + symp
->sy_frag
->fr_address
);
611 if (S_GET_SEGMENT (symp
) == expr_section
)
612 S_SET_SEGMENT (symp
, absolute_section
);
617 resolve_symbol_value (symp
->sy_value
.X_add_symbol
);
619 #if 0 /* I thought this was needed for some of the i386-svr4 PIC
620 support, but it appears I was wrong, and it breaks rs6000
622 if (S_GET_SEGMENT (symp
->sy_value
.X_add_symbol
) != undefined_section
623 && S_GET_SEGMENT (symp
->sy_value
.X_add_symbol
) != expr_section
)
626 if (symp
->sy_value
.X_add_number
== 0)
627 copy_symbol_attributes (symp
, symp
->sy_value
.X_add_symbol
);
630 (symp
->sy_value
.X_add_number
631 + symp
->sy_frag
->fr_address
632 + S_GET_VALUE (symp
->sy_value
.X_add_symbol
)));
633 if (S_GET_SEGMENT (symp
) == expr_section
634 || S_GET_SEGMENT (symp
) == undefined_section
)
636 S_GET_SEGMENT (symp
->sy_value
.X_add_symbol
));
638 resolved
= symp
->sy_value
.X_add_symbol
->sy_resolved
;
643 resolve_symbol_value (symp
->sy_value
.X_add_symbol
);
644 if (symp
->sy_value
.X_op
== O_uminus
)
645 val
= - S_GET_VALUE (symp
->sy_value
.X_add_symbol
);
647 val
= ~ S_GET_VALUE (symp
->sy_value
.X_add_symbol
);
650 + symp
->sy_value
.X_add_number
651 + symp
->sy_frag
->fr_address
));
652 if (S_GET_SEGMENT (symp
) == expr_section
653 || S_GET_SEGMENT (symp
) == undefined_section
)
654 S_SET_SEGMENT (symp
, absolute_section
);
655 resolved
= symp
->sy_value
.X_add_symbol
->sy_resolved
;
659 resolve_symbol_value (symp
->sy_value
.X_add_symbol
);
660 resolve_symbol_value (symp
->sy_value
.X_op_symbol
);
661 seg_left
= S_GET_SEGMENT (symp
->sy_value
.X_add_symbol
);
662 seg_right
= S_GET_SEGMENT (symp
->sy_value
.X_op_symbol
);
663 /* This case comes up with PIC support. */
665 symbolS
*s_left
= symp
->sy_value
.X_add_symbol
;
666 symbolS
*s_right
= symp
->sy_value
.X_op_symbol
;
668 if (seg_left
== absolute_section
)
676 seg_left
= seg_right
;
679 if (seg_right
== absolute_section
680 && s_right
->sy_resolved
)
682 symp
->sy_value
.X_add_number
+= S_GET_VALUE (s_right
);
683 symp
->sy_value
.X_op_symbol
= 0;
684 symp
->sy_value
.X_add_symbol
= s_left
;
685 symp
->sy_value
.X_op
= O_symbol
;
696 case O_bit_inclusive_or
:
698 case O_bit_exclusive_or
:
701 resolve_symbol_value (symp
->sy_value
.X_add_symbol
);
702 resolve_symbol_value (symp
->sy_value
.X_op_symbol
);
703 seg_left
= S_GET_SEGMENT (symp
->sy_value
.X_add_symbol
);
704 seg_right
= S_GET_SEGMENT (symp
->sy_value
.X_op_symbol
);
705 if (seg_left
!= seg_right
706 && seg_left
!= undefined_section
707 && seg_right
!= undefined_section
)
708 as_bad ("%s is operation on symbols in different sections",
710 if ((S_GET_SEGMENT (symp
->sy_value
.X_add_symbol
)
712 && symp
->sy_value
.X_op
!= O_subtract
)
713 as_bad ("%s is illegal operation on non-absolute symbols",
715 left
= S_GET_VALUE (symp
->sy_value
.X_add_symbol
);
716 right
= S_GET_VALUE (symp
->sy_value
.X_op_symbol
);
717 switch (symp
->sy_value
.X_op
)
719 case O_multiply
: val
= left
* right
; break;
720 case O_divide
: val
= left
/ right
; break;
721 case O_modulus
: val
= left
% right
; break;
722 case O_left_shift
: val
= left
<< right
; break;
723 case O_right_shift
: val
= left
>> right
; break;
724 case O_bit_inclusive_or
: val
= left
| right
; break;
725 case O_bit_or_not
: val
= left
|~ right
; break;
726 case O_bit_exclusive_or
: val
= left
^ right
; break;
727 case O_bit_and
: val
= left
& right
; break;
728 case O_add
: val
= left
+ right
; break;
729 case O_subtract
: val
= left
- right
; break;
733 (symp
->sy_value
.X_add_number
734 + symp
->sy_frag
->fr_address
736 if (S_GET_SEGMENT (symp
) == expr_section
737 || S_GET_SEGMENT (symp
) == undefined_section
)
738 S_SET_SEGMENT (symp
, absolute_section
);
739 resolved
= (symp
->sy_value
.X_add_symbol
->sy_resolved
740 && symp
->sy_value
.X_op_symbol
->sy_resolved
);
746 /* Give an error (below) if not in expr_section. We don't
747 want to worry about expr_section symbols, because they
748 are fictional (they are created as part of expression
749 resolution), and any problems may not actually mean
755 /* Don't worry if we can't resolve an expr_section symbol. */
757 symp
->sy_resolved
= 1;
758 else if (S_GET_SEGMENT (symp
) != expr_section
)
760 as_bad ("can't resolve value for symbol \"%s\"", S_GET_NAME (symp
));
761 symp
->sy_resolved
= 1;
765 /* Dollar labels look like a number followed by a dollar sign. Eg, "42$".
766 They are *really* local. That is, they go out of scope whenever we see a
767 label that isn't local. Also, like fb labels, there can be multiple
768 instances of a dollar label. Therefor, we name encode each instance with
769 the instance number, keep a list of defined symbols separate from the real
770 symbol table, and we treat these buggers as a sparse array. */
772 static long *dollar_labels
;
773 static long *dollar_label_instances
;
774 static char *dollar_label_defines
;
775 static long dollar_label_count
;
776 static unsigned long dollar_label_max
;
779 dollar_label_defined (label
)
784 know ((dollar_labels
!= NULL
) || (dollar_label_count
== 0));
786 for (i
= dollar_labels
; i
< dollar_labels
+ dollar_label_count
; ++i
)
788 return dollar_label_defines
[i
- dollar_labels
];
790 /* if we get here, label isn't defined */
792 } /* dollar_label_defined() */
795 dollar_label_instance (label
)
800 know ((dollar_labels
!= NULL
) || (dollar_label_count
== 0));
802 for (i
= dollar_labels
; i
< dollar_labels
+ dollar_label_count
; ++i
)
804 return (dollar_label_instances
[i
- dollar_labels
]);
806 /* If we get here, we haven't seen the label before, therefore its instance
812 dollar_label_clear ()
814 memset (dollar_label_defines
, '\0', (unsigned int) dollar_label_count
);
817 #define DOLLAR_LABEL_BUMP_BY 10
820 define_dollar_label (label
)
825 for (i
= dollar_labels
; i
< dollar_labels
+ dollar_label_count
; ++i
)
828 ++dollar_label_instances
[i
- dollar_labels
];
829 dollar_label_defines
[i
- dollar_labels
] = 1;
833 /* if we get to here, we don't have label listed yet. */
835 if (dollar_labels
== NULL
)
837 dollar_labels
= (long *) xmalloc (DOLLAR_LABEL_BUMP_BY
* sizeof (long));
838 dollar_label_instances
= (long *) xmalloc (DOLLAR_LABEL_BUMP_BY
* sizeof (long));
839 dollar_label_defines
= xmalloc (DOLLAR_LABEL_BUMP_BY
);
840 dollar_label_max
= DOLLAR_LABEL_BUMP_BY
;
841 dollar_label_count
= 0;
843 else if (dollar_label_count
== dollar_label_max
)
845 dollar_label_max
+= DOLLAR_LABEL_BUMP_BY
;
846 dollar_labels
= (long *) xrealloc ((char *) dollar_labels
,
847 dollar_label_max
* sizeof (long));
848 dollar_label_instances
= (long *) xrealloc ((char *) dollar_label_instances
,
849 dollar_label_max
* sizeof (long));
850 dollar_label_defines
= xrealloc (dollar_label_defines
, dollar_label_max
);
851 } /* if we needed to grow */
853 dollar_labels
[dollar_label_count
] = label
;
854 dollar_label_instances
[dollar_label_count
] = 1;
855 dollar_label_defines
[dollar_label_count
] = 1;
856 ++dollar_label_count
;
860 * dollar_label_name()
862 * Caller must copy returned name: we re-use the area for the next name.
864 * The mth occurence of label n: is turned into the symbol "Ln^Am"
865 * where n is the label number and m is the instance number. "L" makes
866 * it a label discarded unless debugging and "^A"('\1') ensures no
867 * ordinary symbol SHOULD get the same name as a local label
868 * symbol. The first "4:" is "L4^A1" - the m numbers begin at 1.
870 * fb labels get the same treatment, except that ^B is used in place of ^A.
873 char * /* Return local label name. */
874 dollar_label_name (n
, augend
)
875 register long n
; /* we just saw "n$:" : n a number */
876 register int augend
; /* 0 for current instance, 1 for new instance */
879 /* Returned to caller, then copied. used for created names ("4f") */
880 static char symbol_name_build
[24];
883 char symbol_name_temporary
[20]; /* build up a number, BACKWARDS */
886 know (augend
== 0 || augend
== 1);
887 p
= symbol_name_build
;
890 /* Next code just does sprintf( {}, "%d", n); */
892 q
= symbol_name_temporary
;
893 for (*q
++ = 0, i
= n
; i
; ++q
)
898 while ((*p
= *--q
) != '\0')
903 /* instance number */
904 q
= symbol_name_temporary
;
905 for (*q
++ = 0, i
= dollar_label_instance (n
) + augend
; i
; ++q
)
910 while ((*p
++ = *--q
) != '\0');;
912 /* The label, as a '\0' ended string, starts at symbol_name_build. */
913 return symbol_name_build
;
917 * Sombody else's idea of local labels. They are made by "n:" where n
918 * is any decimal digit. Refer to them with
919 * "nb" for previous (backward) n:
920 * or "nf" for next (forward) n:.
922 * We do a little better and let n be any number, not just a single digit, but
923 * since the other guy's assembler only does ten, we treat the first ten
926 * Like someone else's assembler, we have one set of local label counters for
927 * entire assembly, not one set per (sub)segment like in most assemblers. This
928 * implies that one can refer to a label in another segment, and indeed some
929 * crufty compilers have done just that.
931 * Since there could be a LOT of these things, treat them as a sparse array.
934 #define FB_LABEL_SPECIAL (10)
936 static long fb_low_counter
[FB_LABEL_SPECIAL
];
937 static long *fb_labels
;
938 static long *fb_label_instances
;
939 static long fb_label_count
;
940 static long fb_label_max
;
942 /* this must be more than FB_LABEL_SPECIAL */
943 #define FB_LABEL_BUMP_BY (FB_LABEL_SPECIAL + 6)
948 memset ((void *) fb_low_counter
, '\0', sizeof (fb_low_counter
));
949 } /* fb_label_init() */
951 /* add one to the instance number of this fb label */
953 fb_label_instance_inc (label
)
958 if (label
< FB_LABEL_SPECIAL
)
960 ++fb_low_counter
[label
];
964 if (fb_labels
!= NULL
)
966 for (i
= fb_labels
+ FB_LABEL_SPECIAL
;
967 i
< fb_labels
+ fb_label_count
; ++i
)
971 ++fb_label_instances
[i
- fb_labels
];
973 } /* if we find it */
974 } /* for each existing label */
977 /* if we get to here, we don't have label listed yet. */
979 if (fb_labels
== NULL
)
981 fb_labels
= (long *) xmalloc (FB_LABEL_BUMP_BY
* sizeof (long));
982 fb_label_instances
= (long *) xmalloc (FB_LABEL_BUMP_BY
* sizeof (long));
983 fb_label_max
= FB_LABEL_BUMP_BY
;
984 fb_label_count
= FB_LABEL_SPECIAL
;
987 else if (fb_label_count
== fb_label_max
)
989 fb_label_max
+= FB_LABEL_BUMP_BY
;
990 fb_labels
= (long *) xrealloc ((char *) fb_labels
,
991 fb_label_max
* sizeof (long));
992 fb_label_instances
= (long *) xrealloc ((char *) fb_label_instances
,
993 fb_label_max
* sizeof (long));
994 } /* if we needed to grow */
996 fb_labels
[fb_label_count
] = label
;
997 fb_label_instances
[fb_label_count
] = 1;
1002 fb_label_instance (label
)
1007 if (label
< FB_LABEL_SPECIAL
)
1009 return (fb_low_counter
[label
]);
1012 if (fb_labels
!= NULL
)
1014 for (i
= fb_labels
+ FB_LABEL_SPECIAL
;
1015 i
< fb_labels
+ fb_label_count
; ++i
)
1019 return (fb_label_instances
[i
- fb_labels
]);
1020 } /* if we find it */
1021 } /* for each existing label */
1024 /* We didn't find the label, so this must be a reference to the
1032 * Caller must copy returned name: we re-use the area for the next name.
1034 * The mth occurence of label n: is turned into the symbol "Ln^Bm"
1035 * where n is the label number and m is the instance number. "L" makes
1036 * it a label discarded unless debugging and "^B"('\2') ensures no
1037 * ordinary symbol SHOULD get the same name as a local label
1038 * symbol. The first "4:" is "L4^B1" - the m numbers begin at 1.
1040 * dollar labels get the same treatment, except that ^A is used in place of ^B. */
1042 char * /* Return local label name. */
1043 fb_label_name (n
, augend
)
1044 long n
; /* we just saw "n:", "nf" or "nb" : n a number */
1045 long augend
; /* 0 for nb, 1 for n:, nf */
1048 /* Returned to caller, then copied. used for created names ("4f") */
1049 static char symbol_name_build
[24];
1052 char symbol_name_temporary
[20]; /* build up a number, BACKWARDS */
1055 know (augend
== 0 || augend
== 1);
1056 p
= symbol_name_build
;
1059 /* Next code just does sprintf( {}, "%d", n); */
1061 q
= symbol_name_temporary
;
1062 for (*q
++ = 0, i
= n
; i
; ++q
)
1067 while ((*p
= *--q
) != '\0')
1072 /* instance number */
1073 q
= symbol_name_temporary
;
1074 for (*q
++ = 0, i
= fb_label_instance (n
) + augend
; i
; ++q
)
1079 while ((*p
++ = *--q
) != '\0');;
1081 /* The label, as a '\0' ended string, starts at symbol_name_build. */
1082 return (symbol_name_build
);
1083 } /* fb_label_name() */
1086 * decode name that may have been generated by foo_label_name() above. If
1087 * the name wasn't generated by foo_label_name(), then return it unaltered.
1088 * This is used for error messages.
1092 decode_local_label_name (s
)
1096 char *symbol_decode
;
1098 int instance_number
;
1100 const char *message_format
= "\"%d\" (instance number %d of a %s label)";
1105 for (label_number
= 0, p
= s
+ 1; isdigit (*p
); ++p
)
1106 label_number
= (10 * label_number
) + *p
- '0';
1115 for (instance_number
= 0, p
++; isdigit (*p
); ++p
)
1116 instance_number
= (10 * instance_number
) + *p
- '0';
1118 symbol_decode
= obstack_alloc (¬es
, strlen (message_format
) + 30);
1119 sprintf (symbol_decode
, message_format
, label_number
, instance_number
, type
);
1121 return symbol_decode
;
1124 /* Get the value of a symbol. */
1130 if (!s
->sy_resolved
&& !s
->sy_resolving
&& s
->sy_value
.X_op
!= O_constant
)
1131 resolve_symbol_value (s
);
1132 if (s
->sy_value
.X_op
!= O_constant
)
1133 as_bad ("Attempt to get value of unresolved symbol %s", S_GET_NAME (s
));
1134 return (valueT
) s
->sy_value
.X_add_number
;
1137 /* Set the value of a symbol. */
1140 S_SET_VALUE (s
, val
)
1144 s
->sy_value
.X_op
= O_constant
;
1145 s
->sy_value
.X_add_number
= (offsetT
) val
;
1146 s
->sy_value
.X_unsigned
= 0;
1150 copy_symbol_attributes (dest
, src
)
1151 symbolS
*dest
, *src
;
1153 #ifdef BFD_ASSEMBLER
1154 /* In an expression, transfer the settings of these flags.
1155 The user can override later, of course. */
1156 #define COPIED_SYMFLAGS (BSF_FUNCTION)
1157 dest
->bsym
->flags
|= src
->bsym
->flags
& COPIED_SYMFLAGS
;
1160 #ifdef OBJ_COPY_SYMBOL_ATTRIBUTES
1161 OBJ_COPY_SYMBOL_ATTRIBUTES (dest
, src
);
1165 #ifdef BFD_ASSEMBLER
1171 flagword flags
= s
->bsym
->flags
;
1174 if (flags
& BSF_LOCAL
&& flags
& BSF_GLOBAL
)
1177 return (flags
& BSF_GLOBAL
) != 0;
1184 return bfd_is_com_section (s
->bsym
->section
);
1191 return s
->bsym
->section
!= undefined_section
;
1198 if (s
->bsym
->flags
& BSF_DEBUGGING
)
1207 flagword flags
= s
->bsym
->flags
;
1210 if (flags
& BSF_LOCAL
&& flags
& BSF_GLOBAL
)
1213 return (S_GET_NAME (s
)
1215 && (strchr (S_GET_NAME (s
), '\001')
1216 || strchr (S_GET_NAME (s
), '\002')
1217 || (S_LOCAL_NAME (s
)
1218 && !flag_keep_locals
)));
1225 return S_IS_EXTERNAL (s
);
1232 return S_GET_NAME (s
) == 0;
1239 return s
->bsym
->name
;
1246 return s
->bsym
->section
;
1250 S_SET_SEGMENT (s
, seg
)
1254 s
->bsym
->section
= seg
;
1261 if ((s
->bsym
->flags
& BSF_WEAK
) != 0)
1262 as_warn ("%s already declared as weak", S_GET_NAME (s
));
1263 s
->bsym
->flags
|= BSF_GLOBAL
;
1264 s
->bsym
->flags
&= ~(BSF_LOCAL
|BSF_WEAK
);
1268 S_CLEAR_EXTERNAL (s
)
1271 if ((s
->bsym
->flags
& BSF_WEAK
) != 0)
1272 as_warn ("%s already declared as weak", S_GET_NAME (s
));
1273 s
->bsym
->flags
|= BSF_LOCAL
;
1274 s
->bsym
->flags
&= ~(BSF_GLOBAL
|BSF_WEAK
);
1281 if ((s
->bsym
->flags
& BSF_GLOBAL
) != 0)
1282 as_warn ("%s already declared as global", S_GET_NAME (s
));
1283 s
->bsym
->flags
|= BSF_WEAK
;
1284 s
->bsym
->flags
&= ~(BSF_GLOBAL
|BSF_LOCAL
);
1288 S_SET_NAME (s
, name
)
1292 s
->bsym
->name
= name
;
1294 #endif /* BFD_ASSEMBLER */
1299 symbol_lastP
= NULL
;
1300 symbol_rootP
= NULL
; /* In case we have 0 symbols (!!) */
1301 sy_hash
= hash_new ();
1303 memset ((char *) (&abs_symbol
), '\0', sizeof (abs_symbol
));
1304 #ifdef BFD_ASSEMBLER
1305 #if defined (EMIT_SECTION_SYMBOLS) || !defined (RELOC_REQUIRES_SYMBOL)
1306 abs_symbol
.bsym
= bfd_abs_section
.symbol
;
1309 /* Can't initialise a union. Sigh. */
1310 S_SET_SEGMENT (&abs_symbol
, absolute_section
);
1312 abs_symbol
.sy_value
.X_op
= O_constant
;
1314 if (LOCAL_LABELS_FB
)
1326 printf ("%*s", indent_level
* 4, "");
1331 void print_expr_1
PARAMS ((FILE *, expressionS
*));
1332 void print_symbol_value_1
PARAMS ((FILE *, symbolS
*));
1335 print_symbol_value_1 (file
, sym
)
1339 const char *name
= S_GET_NAME (sym
);
1340 if (!name
|| !name
[0])
1342 fprintf (file
, "sym %lx %s", (unsigned long) sym
, name
);
1343 if (sym
->sy_frag
!= &zero_address_frag
)
1344 fprintf (file
, " frag %lx", (long) sym
->sy_frag
);
1346 fprintf (file
, " written");
1347 if (sym
->sy_resolved
)
1348 fprintf (file
, " resolved");
1349 else if (sym
->sy_resolving
)
1350 fprintf (file
, " resolving");
1351 if (sym
->sy_used_in_reloc
)
1352 fprintf (file
, " used-in-reloc");
1354 fprintf (file
, " used");
1355 if (S_IS_LOCAL (sym
))
1356 fprintf (file
, " local");
1357 if (S_IS_EXTERN (sym
))
1358 fprintf (file
, " extern");
1359 if (S_IS_DEBUG (sym
))
1360 fprintf (file
, " debug");
1361 if (S_IS_DEFINED (sym
))
1362 fprintf (file
, " defined");
1363 fprintf (file
, " %s", segment_name (S_GET_SEGMENT (sym
)));
1364 if (sym
->sy_resolved
)
1366 segT s
= S_GET_SEGMENT (sym
);
1368 if (s
!= undefined_section
1369 && s
!= expr_section
)
1370 fprintf (file
, " %lx", (long) S_GET_VALUE (sym
));
1372 else if (indent_level
< 8 && S_GET_SEGMENT (sym
) != undefined_section
)
1375 fprintf (file
, "\n%*s<", indent_level
* 4, "");
1376 print_expr_1 (file
, &sym
->sy_value
);
1377 fprintf (file
, ">");
1384 print_symbol_value (sym
)
1388 print_symbol_value_1 (stderr
, sym
);
1389 fprintf (stderr
, "\n");
1393 print_expr_1 (file
, exp
)
1397 fprintf (file
, "expr %lx ", (long) exp
);
1401 fprintf (file
, "illegal");
1404 fprintf (file
, "absent");
1407 fprintf (file
, "constant %lx", (long) exp
->X_add_number
);
1411 fprintf (file
, "symbol\n%*s<", indent_level
* 4, "");
1412 print_symbol_value_1 (file
, exp
->X_add_symbol
);
1413 fprintf (file
, ">");
1415 if (exp
->X_add_number
)
1416 fprintf (file
, "\n%*s%lx", indent_level
* 4, "",
1417 (long) exp
->X_add_number
);
1421 fprintf (file
, "register #%d", (int) exp
->X_add_number
);
1424 fprintf (file
, "big");
1427 fprintf (file
, "uminus -<");
1429 print_symbol_value_1 (file
, exp
->X_add_symbol
);
1430 fprintf (file
, ">");
1431 goto maybe_print_addnum
;
1433 fprintf (file
, "bit_not");
1436 fprintf (file
, "multiply");
1439 fprintf (file
, "divide");
1442 fprintf (file
, "modulus");
1445 fprintf (file
, "lshift");
1448 fprintf (file
, "rshift");
1450 case O_bit_inclusive_or
:
1451 fprintf (file
, "bit_ior");
1453 case O_bit_exclusive_or
:
1454 fprintf (file
, "bit_xor");
1457 fprintf (file
, "bit_and");
1461 fprintf (file
, "add\n%*s<", indent_level
* 4, "");
1462 print_symbol_value_1 (file
, exp
->X_add_symbol
);
1463 fprintf (file
, ">\n%*s<", indent_level
* 4, "");
1464 print_symbol_value_1 (file
, exp
->X_op_symbol
);
1465 fprintf (file
, ">");
1466 goto maybe_print_addnum
;
1469 fprintf (file
, "subtract\n%*s<", indent_level
* 4, "");
1470 print_symbol_value_1 (file
, exp
->X_add_symbol
);
1471 fprintf (file
, ">\n%*s<", indent_level
* 4, "");
1472 print_symbol_value_1 (file
, exp
->X_op_symbol
);
1473 fprintf (file
, ">");
1474 goto maybe_print_addnum
;
1476 fprintf (file
, "{unknown opcode %d}", (int) exp
->X_op
);
1486 print_expr_1 (stderr
, exp
);
1487 fprintf (stderr
, "\n");
1490 /* end of symbols.c */
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