1 /* symbols.c -symbol table-
2 Copyright (C) 1987-2019 Free Software Foundation, Inc.
4 This file is part of GAS, the GNU Assembler.
6 GAS is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3, or (at your option)
11 GAS is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GAS; see the file COPYING. If not, write to the Free
18 Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
21 /* #define DEBUG_SYMS / * to debug symbol list maintenance. */
24 #include "safe-ctype.h"
25 #include "obstack.h" /* For "symbols.h" */
31 /* Whether the symbol is a local_symbol. */
32 unsigned int sy_local_symbol : 1;
34 /* Weather symbol has been written. */
35 unsigned int sy_written : 1;
37 /* Whether symbol value has been completely resolved (used during
38 final pass over symbol table). */
39 unsigned int sy_resolved : 1;
41 /* Whether the symbol value is currently being resolved (used to
42 detect loops in symbol dependencies). */
43 unsigned int sy_resolving : 1;
45 /* Whether the symbol value is used in a reloc. This is used to
46 ensure that symbols used in relocs are written out, even if they
47 are local and would otherwise not be. */
48 unsigned int sy_used_in_reloc : 1;
50 /* Whether the symbol is used as an operand or in an expression.
51 NOTE: Not all the backends keep this information accurate;
52 backends which use this bit are responsible for setting it when
53 a symbol is used in backend routines. */
54 unsigned int sy_used : 1;
56 /* Whether the symbol can be re-defined. */
57 unsigned int sy_volatile : 1;
59 /* Whether the symbol is a forward reference. */
60 unsigned int sy_forward_ref : 1;
62 /* This is set if the symbol is defined in an MRI common section.
63 We handle such sections as single common symbols, so symbols
64 defined within them must be treated specially by the relocation
66 unsigned int sy_mri_common : 1;
68 /* This is set if the symbol is set with a .weakref directive. */
69 unsigned int sy_weakrefr : 1;
71 /* This is set when the symbol is referenced as part of a .weakref
72 directive, but only if the symbol was not in the symbol table
73 before. It is cleared as soon as any direct reference to the
75 unsigned int sy_weakrefd : 1;
77 /* This if set if the unit of the symbol value is "octets" instead
79 unsigned int sy_octets : 1;
82 /* The information we keep for a symbol. Note that the symbol table
83 holds pointers both to this and to local_symbol structures. See
89 struct symbol_flags sy_flags;
94 /* The value of the symbol. */
97 /* Forwards and (optionally) backwards chain pointers. */
98 struct symbol *sy_next;
99 struct symbol *sy_previous;
101 /* Pointer to the frag this symbol is attached to, if any.
103 struct frag *sy_frag;
105 #ifdef OBJ_SYMFIELD_TYPE
106 OBJ_SYMFIELD_TYPE sy_obj;
109 #ifdef TC_SYMFIELD_TYPE
110 TC_SYMFIELD_TYPE sy_tc;
113 #ifdef TARGET_SYMBOL_FIELDS
118 /* A pointer in the symbol may point to either a complete symbol
119 (struct symbol above) or to a local symbol (struct local_symbol
120 defined here). The symbol code can detect the case by examining
121 the first field. It is always NULL for a local symbol.
123 We do this because we ordinarily only need a small amount of
124 information for a local symbol. The symbol table takes up a lot of
125 space, and storing less information for a local symbol can make a
126 big difference in assembler memory usage when assembling a large
131 /* Symbol flags. Only sy_local_symbol and sy_resolved are relevant. */
132 struct symbol_flags lsy_flags;
134 /* The symbol section. This also serves as a flag. If this is
135 reg_section, then this symbol has been converted into a regular
136 symbol, and lsy_sym points to it. */
139 /* The symbol name. */
140 const char *lsy_name;
142 /* The symbol frag or the real symbol, depending upon the value in
150 /* The value of the symbol. */
153 #ifdef TC_LOCAL_SYMFIELD_TYPE
154 TC_LOCAL_SYMFIELD_TYPE lsy_tc;
158 #define local_symbol_converted_p(l) ((l)->lsy_section == reg_section)
159 #define local_symbol_mark_converted(l) ((l)->lsy_section = reg_section)
160 #define local_symbol_resolved_p(l) ((l)->lsy_flags.sy_resolved)
161 #define local_symbol_mark_resolved(l) ((l)->lsy_flags.sy_resolved = 1)
162 #define local_symbol_get_frag(l) ((l)->u.lsy_frag)
163 #define local_symbol_set_frag(l, f) ((l)->u.lsy_frag = (f))
164 #define local_symbol_get_real_symbol(l) ((l)->u.lsy_sym)
165 #define local_symbol_set_real_symbol(l, s) ((l)->u.lsy_sym = (s))
167 /* This is non-zero if symbols are case sensitive, which is the
169 int symbols_case_sensitive = 1;
171 #ifndef WORKING_DOT_WORD
172 extern int new_broken_words;
175 /* symbol-name => struct symbol pointer */
176 static struct hash_control *sy_hash;
178 /* Table of local symbols. */
179 static struct hash_control *local_hash;
181 /* Below are commented in "symbols.h". */
182 symbolS *symbol_rootP;
183 symbolS *symbol_lastP;
188 #define debug_verify_symchain verify_symbol_chain
190 #define debug_verify_symchain(root, last) ((void) 0)
193 #define DOLLAR_LABEL_CHAR '\001'
194 #define LOCAL_LABEL_CHAR '\002'
196 #ifndef TC_LABEL_IS_LOCAL
197 #define TC_LABEL_IS_LOCAL(name) 0
200 struct obstack notes;
202 /* The name of an external symbol which is
203 used to make weak PE symbol names unique. */
204 const char * an_external_name;
207 static const char *save_symbol_name (const char *);
208 static void fb_label_init (void);
209 static long dollar_label_instance (long);
210 static long fb_label_instance (long);
212 static void print_binary (FILE *, const char *, expressionS *);
214 /* Return a pointer to a new symbol. Die if we can't make a new
215 symbol. Fill in the symbol's values. Add symbol to end of symbol
218 This function should be called in the general case of creating a
219 symbol. However, if the output file symbol table has already been
220 set, and you are certain that this symbol won't be wanted in the
221 output file, you can call symbol_create. */
224 symbol_new (const char *name, segT segment, valueT valu, fragS *frag)
226 symbolS *symbolP = symbol_create (name, segment, valu, frag);
228 /* Link to end of symbol chain. */
230 extern int symbol_table_frozen;
231 if (symbol_table_frozen)
234 symbol_append (symbolP, symbol_lastP, &symbol_rootP, &symbol_lastP);
239 /* Save a symbol name on a permanent obstack, and convert it according
240 to the object file format. */
243 save_symbol_name (const char *name)
248 gas_assert (name != NULL);
249 name_length = strlen (name) + 1; /* +1 for \0. */
250 obstack_grow (¬es, name, name_length);
251 ret = (char *) obstack_finish (¬es);
253 #ifdef tc_canonicalize_symbol_name
254 ret = tc_canonicalize_symbol_name (ret);
257 if (! symbols_case_sensitive)
261 for (s = ret; *s != '\0'; s++)
269 symbol_create (const char *name, /* It is copied, the caller can destroy/modify. */
270 segT segment, /* Segment identifier (SEG_<something>). */
271 valueT valu, /* Symbol value. */
272 fragS *frag /* Associated fragment. */)
274 const char *preserved_copy_of_name;
277 preserved_copy_of_name = save_symbol_name (name);
279 symbolP = (symbolS *) obstack_alloc (¬es, sizeof (symbolS));
281 /* symbol must be born in some fixed state. This seems as good as any. */
282 memset (symbolP, 0, sizeof (symbolS));
284 symbolP->bsym = bfd_make_empty_symbol (stdoutput);
285 if (symbolP->bsym == NULL)
286 as_fatal ("bfd_make_empty_symbol: %s", bfd_errmsg (bfd_get_error ()));
287 S_SET_NAME (symbolP, preserved_copy_of_name);
289 S_SET_SEGMENT (symbolP, segment);
290 S_SET_VALUE (symbolP, valu);
291 symbol_clear_list_pointers (symbolP);
293 symbolP->sy_frag = frag;
295 obj_symbol_new_hook (symbolP);
297 #ifdef tc_symbol_new_hook
298 tc_symbol_new_hook (symbolP);
305 /* Local symbol support. If we can get away with it, we keep only a
306 small amount of information for local symbols. */
308 static symbolS *local_symbol_convert (struct local_symbol *);
310 /* Used for statistics. */
312 static unsigned long local_symbol_count;
313 static unsigned long local_symbol_conversion_count;
315 /* This macro is called with a symbol argument passed by reference.
316 It returns whether this is a local symbol. If necessary, it
317 changes its argument to the real symbol. */
319 #define LOCAL_SYMBOL_CHECK(s) \
320 (s->sy_flags.sy_local_symbol \
321 ? (local_symbol_converted_p ((struct local_symbol *) s) \
322 ? (s = local_symbol_get_real_symbol ((struct local_symbol *) s), \
327 /* Create a local symbol and insert it into the local hash table. */
329 struct local_symbol *
330 local_symbol_make (const char *name, segT section, valueT val, fragS *frag)
332 const char *name_copy;
333 struct local_symbol *ret;
335 ++local_symbol_count;
337 name_copy = save_symbol_name (name);
339 ret = (struct local_symbol *) obstack_alloc (¬es, sizeof *ret);
340 ret->lsy_flags.sy_local_symbol = 1;
341 ret->lsy_flags.sy_resolved = 0;
342 ret->lsy_name = name_copy;
343 ret->lsy_section = section;
344 local_symbol_set_frag (ret, frag);
345 ret->lsy_value = val;
347 hash_jam (local_hash, name_copy, (void *) ret);
352 /* Convert a local symbol into a real symbol. Note that we do not
353 reclaim the space used by the local symbol. */
356 local_symbol_convert (struct local_symbol *locsym)
360 gas_assert (locsym->lsy_flags.sy_local_symbol);
361 if (local_symbol_converted_p (locsym))
362 return local_symbol_get_real_symbol (locsym);
364 ++local_symbol_conversion_count;
366 ret = symbol_new (locsym->lsy_name, locsym->lsy_section, locsym->lsy_value,
367 local_symbol_get_frag (locsym));
369 if (local_symbol_resolved_p (locsym))
370 ret->sy_flags.sy_resolved = 1;
372 /* Local symbols are always either defined or used. */
373 ret->sy_flags.sy_used = 1;
375 #ifdef TC_LOCAL_SYMFIELD_CONVERT
376 TC_LOCAL_SYMFIELD_CONVERT (locsym, ret);
379 symbol_table_insert (ret);
381 local_symbol_mark_converted (locsym);
382 local_symbol_set_real_symbol (locsym, ret);
384 hash_jam (local_hash, locsym->lsy_name, NULL);
390 define_sym_at_dot (symbolS *symbolP)
392 symbolP->sy_frag = frag_now;
393 S_SET_VALUE (symbolP, (valueT) frag_now_fix ());
394 S_SET_SEGMENT (symbolP, now_seg);
397 /* We have just seen "<name>:".
398 Creates a struct symbol unless it already exists.
400 Gripes if we are redefining a symbol incompatibly (and ignores it). */
403 colon (/* Just seen "x:" - rattle symbols & frags. */
404 const char *sym_name /* Symbol name, as a canonical string. */
405 /* We copy this string: OK to alter later. */)
407 symbolS *symbolP; /* Symbol we are working with. */
409 /* Sun local labels go out of scope whenever a non-local symbol is
411 if (LOCAL_LABELS_DOLLAR
412 && !bfd_is_local_label_name (stdoutput, sym_name))
413 dollar_label_clear ();
415 #ifndef WORKING_DOT_WORD
416 if (new_broken_words)
418 struct broken_word *a;
423 if (now_seg == absolute_section)
425 as_bad (_("cannot define symbol `%s' in absolute section"), sym_name);
429 possible_bytes = (md_short_jump_size
430 + new_broken_words * md_long_jump_size);
433 frag_opcode = frag_var (rs_broken_word,
437 (symbolS *) broken_words,
441 /* We want to store the pointer to where to insert the jump
442 table in the fr_opcode of the rs_broken_word frag. This
443 requires a little hackery. */
445 && (frag_tmp->fr_type != rs_broken_word
446 || frag_tmp->fr_opcode))
447 frag_tmp = frag_tmp->fr_next;
449 frag_tmp->fr_opcode = frag_opcode;
450 new_broken_words = 0;
452 for (a = broken_words; a && a->dispfrag == 0; a = a->next_broken_word)
453 a->dispfrag = frag_tmp;
455 #endif /* WORKING_DOT_WORD */
457 #ifdef obj_frob_colon
458 obj_frob_colon (sym_name);
461 if ((symbolP = symbol_find (sym_name)) != 0)
463 S_CLEAR_WEAKREFR (symbolP);
464 #ifdef RESOLVE_SYMBOL_REDEFINITION
465 if (RESOLVE_SYMBOL_REDEFINITION (symbolP))
468 /* Now check for undefined symbols. */
469 if (LOCAL_SYMBOL_CHECK (symbolP))
471 struct local_symbol *locsym = (struct local_symbol *) symbolP;
473 if (locsym->lsy_section != undefined_section
474 && (local_symbol_get_frag (locsym) != frag_now
475 || locsym->lsy_section != now_seg
476 || locsym->lsy_value != frag_now_fix ()))
478 as_bad (_("symbol `%s' is already defined"), sym_name);
482 locsym->lsy_section = now_seg;
483 local_symbol_set_frag (locsym, frag_now);
484 locsym->lsy_value = frag_now_fix ();
486 else if (!(S_IS_DEFINED (symbolP) || symbol_equated_p (symbolP))
487 || S_IS_COMMON (symbolP)
488 || S_IS_VOLATILE (symbolP))
490 if (S_IS_VOLATILE (symbolP))
492 symbolP = symbol_clone (symbolP, 1);
493 S_SET_VALUE (symbolP, 0);
494 S_CLEAR_VOLATILE (symbolP);
496 if (S_GET_VALUE (symbolP) == 0)
498 define_sym_at_dot (symbolP);
501 #endif /* if we have one, it better be zero. */
506 /* There are still several cases to check:
508 A .comm/.lcomm symbol being redefined as initialized
511 A .comm/.lcomm symbol being redefined with a larger
514 This only used to be allowed on VMS gas, but Sun cc
515 on the sparc also depends on it. */
517 if (((!S_IS_DEBUG (symbolP)
518 && (!S_IS_DEFINED (symbolP) || S_IS_COMMON (symbolP))
519 && S_IS_EXTERNAL (symbolP))
520 || S_GET_SEGMENT (symbolP) == bss_section)
521 && (now_seg == data_section
522 || now_seg == bss_section
523 || now_seg == S_GET_SEGMENT (symbolP)))
525 /* Select which of the 2 cases this is. */
526 if (now_seg != data_section)
528 /* New .comm for prev .comm symbol.
530 If the new size is larger we just change its
531 value. If the new size is smaller, we ignore
533 if (S_GET_VALUE (symbolP)
534 < ((unsigned) frag_now_fix ()))
536 S_SET_VALUE (symbolP, (valueT) frag_now_fix ());
541 /* It is a .comm/.lcomm being converted to initialized
543 define_sym_at_dot (symbolP);
548 #if (!defined (OBJ_AOUT) && !defined (OBJ_MAYBE_AOUT))
549 static const char *od_buf = "";
553 if (OUTPUT_FLAVOR == bfd_target_aout_flavour)
554 sprintf (od_buf, "%d.%d.",
555 S_GET_OTHER (symbolP),
556 S_GET_DESC (symbolP));
558 as_bad (_("symbol `%s' is already defined as \"%s\"/%s%ld"),
560 segment_name (S_GET_SEGMENT (symbolP)),
562 (long) S_GET_VALUE (symbolP));
564 } /* if the undefined symbol has no value */
568 /* Don't blow up if the definition is the same. */
569 if (!(frag_now == symbolP->sy_frag
570 && S_GET_VALUE (symbolP) == frag_now_fix ()
571 && S_GET_SEGMENT (symbolP) == now_seg))
573 as_bad (_("symbol `%s' is already defined"), sym_name);
574 symbolP = symbol_clone (symbolP, 0);
575 define_sym_at_dot (symbolP);
580 else if (! flag_keep_locals && bfd_is_local_label_name (stdoutput, sym_name))
582 symbolP = (symbolS *) local_symbol_make (sym_name, now_seg,
583 (valueT) frag_now_fix (),
588 symbolP = symbol_new (sym_name, now_seg, (valueT) frag_now_fix (),
591 symbol_table_insert (symbolP);
594 if (mri_common_symbol != NULL)
596 /* This symbol is actually being defined within an MRI common
597 section. This requires special handling. */
598 if (LOCAL_SYMBOL_CHECK (symbolP))
599 symbolP = local_symbol_convert ((struct local_symbol *) symbolP);
600 symbolP->sy_value.X_op = O_symbol;
601 symbolP->sy_value.X_add_symbol = mri_common_symbol;
602 symbolP->sy_value.X_add_number = S_GET_VALUE (mri_common_symbol);
603 symbolP->sy_frag = &zero_address_frag;
604 S_SET_SEGMENT (symbolP, expr_section);
605 symbolP->sy_flags.sy_mri_common = 1;
609 tc_frob_label (symbolP);
611 #ifdef obj_frob_label
612 obj_frob_label (symbolP);
618 /* Die if we can't insert the symbol. */
621 symbol_table_insert (symbolS *symbolP)
623 const char *error_string;
626 know (S_GET_NAME (symbolP));
628 if (LOCAL_SYMBOL_CHECK (symbolP))
630 error_string = hash_jam (local_hash, S_GET_NAME (symbolP),
632 if (error_string != NULL)
633 as_fatal (_("inserting \"%s\" into symbol table failed: %s"),
634 S_GET_NAME (symbolP), error_string);
638 if ((error_string = hash_jam (sy_hash, S_GET_NAME (symbolP), (void *) symbolP)))
640 as_fatal (_("inserting \"%s\" into symbol table failed: %s"),
641 S_GET_NAME (symbolP), error_string);
645 /* If a symbol name does not exist, create it as undefined, and insert
646 it into the symbol table. Return a pointer to it. */
649 symbol_find_or_make (const char *name)
653 symbolP = symbol_find (name);
657 if (! flag_keep_locals && bfd_is_local_label_name (stdoutput, name))
659 symbolP = md_undefined_symbol ((char *) name);
663 symbolP = (symbolS *) local_symbol_make (name, undefined_section,
669 symbolP = symbol_make (name);
671 symbol_table_insert (symbolP);
672 } /* if symbol wasn't found */
678 symbol_make (const char *name)
682 /* Let the machine description default it, e.g. for register names. */
683 symbolP = md_undefined_symbol ((char *) name);
686 symbolP = symbol_new (name, undefined_section, (valueT) 0, &zero_address_frag);
692 symbol_clone (symbolS *orgsymP, int replace)
695 asymbol *bsymorg, *bsymnew;
697 /* Make sure we never clone the dot special symbol. */
698 gas_assert (orgsymP != &dot_symbol);
700 /* Running local_symbol_convert on a clone that's not the one currently
701 in local_hash would incorrectly replace the hash entry. Thus the
702 symbol must be converted here. Note that the rest of the function
703 depends on not encountering an unconverted symbol. */
704 if (LOCAL_SYMBOL_CHECK (orgsymP))
705 orgsymP = local_symbol_convert ((struct local_symbol *) orgsymP);
706 bsymorg = orgsymP->bsym;
708 newsymP = (symbolS *) obstack_alloc (¬es, sizeof (*newsymP));
710 bsymnew = bfd_make_empty_symbol (bfd_asymbol_bfd (bsymorg));
712 as_fatal ("bfd_make_empty_symbol: %s", bfd_errmsg (bfd_get_error ()));
713 newsymP->bsym = bsymnew;
714 bsymnew->name = bsymorg->name;
715 bsymnew->flags = bsymorg->flags & ~BSF_SECTION_SYM;
716 bsymnew->section = bsymorg->section;
717 bfd_copy_private_symbol_data (bfd_asymbol_bfd (bsymorg), bsymorg,
718 bfd_asymbol_bfd (bsymnew), bsymnew);
720 #ifdef obj_symbol_clone_hook
721 obj_symbol_clone_hook (newsymP, orgsymP);
724 #ifdef tc_symbol_clone_hook
725 tc_symbol_clone_hook (newsymP, orgsymP);
730 if (symbol_rootP == orgsymP)
731 symbol_rootP = newsymP;
732 else if (orgsymP->sy_previous)
734 orgsymP->sy_previous->sy_next = newsymP;
735 orgsymP->sy_previous = NULL;
737 if (symbol_lastP == orgsymP)
738 symbol_lastP = newsymP;
739 else if (orgsymP->sy_next)
740 orgsymP->sy_next->sy_previous = newsymP;
742 /* Symbols that won't be output can't be external. */
743 S_CLEAR_EXTERNAL (orgsymP);
744 orgsymP->sy_previous = orgsymP->sy_next = orgsymP;
745 debug_verify_symchain (symbol_rootP, symbol_lastP);
747 symbol_table_insert (newsymP);
751 /* Symbols that won't be output can't be external. */
752 S_CLEAR_EXTERNAL (newsymP);
753 newsymP->sy_previous = newsymP->sy_next = newsymP;
759 /* If S is a local symbol that has been converted, return the
760 converted symbol. Otherwise return S. */
762 static inline symbolS *
763 get_real_sym (symbolS *s)
766 && s->sy_flags.sy_local_symbol
767 && local_symbol_converted_p ((struct local_symbol *) s))
768 s = local_symbol_get_real_symbol ((struct local_symbol *) s);
772 /* Referenced symbols, if they are forward references, need to be cloned
773 (without replacing the original) so that the value of the referenced
774 symbols at the point of use is saved by the clone. */
776 #undef symbol_clone_if_forward_ref
778 symbol_clone_if_forward_ref (symbolS *symbolP, int is_forward)
780 if (symbolP && !LOCAL_SYMBOL_CHECK (symbolP))
782 symbolS *orig_add_symbol = get_real_sym (symbolP->sy_value.X_add_symbol);
783 symbolS *orig_op_symbol = get_real_sym (symbolP->sy_value.X_op_symbol);
784 symbolS *add_symbol = orig_add_symbol;
785 symbolS *op_symbol = orig_op_symbol;
787 if (symbolP->sy_flags.sy_forward_ref)
792 /* assign_symbol() clones volatile symbols; pre-existing expressions
793 hold references to the original instance, but want the current
794 value. Just repeat the lookup. */
795 if (add_symbol && S_IS_VOLATILE (add_symbol))
796 add_symbol = symbol_find_exact (S_GET_NAME (add_symbol));
797 if (op_symbol && S_IS_VOLATILE (op_symbol))
798 op_symbol = symbol_find_exact (S_GET_NAME (op_symbol));
801 /* Re-using sy_resolving here, as this routine cannot get called from
802 symbol resolution code. */
803 if ((symbolP->bsym->section == expr_section
804 || symbolP->sy_flags.sy_forward_ref)
805 && !symbolP->sy_flags.sy_resolving)
807 symbolP->sy_flags.sy_resolving = 1;
808 add_symbol = symbol_clone_if_forward_ref (add_symbol, is_forward);
809 op_symbol = symbol_clone_if_forward_ref (op_symbol, is_forward);
810 symbolP->sy_flags.sy_resolving = 0;
813 if (symbolP->sy_flags.sy_forward_ref
814 || add_symbol != orig_add_symbol
815 || op_symbol != orig_op_symbol)
817 if (symbolP != &dot_symbol)
819 symbolP = symbol_clone (symbolP, 0);
820 symbolP->sy_flags.sy_resolving = 0;
824 symbolP = symbol_temp_new_now ();
825 #ifdef tc_new_dot_label
826 tc_new_dot_label (symbolP);
831 symbolP->sy_value.X_add_symbol = add_symbol;
832 symbolP->sy_value.X_op_symbol = op_symbol;
839 symbol_temp_new (segT seg, valueT ofs, fragS *frag)
841 return symbol_new (FAKE_LABEL_NAME, seg, ofs, frag);
845 symbol_temp_new_now (void)
847 return symbol_temp_new (now_seg, frag_now_fix (), frag_now);
851 symbol_temp_new_now_octets (void)
853 symbolS * symb = symbol_temp_new (now_seg, frag_now_fix_octets (), frag_now);
854 symb->sy_flags.sy_octets = 1;
859 symbol_temp_make (void)
861 return symbol_make (FAKE_LABEL_NAME);
864 /* Implement symbol table lookup.
865 In: A symbol's name as a string: '\0' can't be part of a symbol name.
866 Out: NULL if the name was not in the symbol table, else the address
867 of a struct symbol associated with that name. */
870 symbol_find_exact (const char *name)
872 return symbol_find_exact_noref (name, 0);
876 symbol_find_exact_noref (const char *name, int noref)
878 struct local_symbol *locsym;
881 locsym = (struct local_symbol *) hash_find (local_hash, name);
883 return (symbolS *) locsym;
885 sym = ((symbolS *) hash_find (sy_hash, name));
887 /* Any references to the symbol, except for the reference in
888 .weakref, must clear this flag, such that the symbol does not
889 turn into a weak symbol. Note that we don't have to handle the
890 local_symbol case, since a weakrefd is always promoted out of the
891 local_symbol table when it is turned into a weak symbol. */
893 S_CLEAR_WEAKREFD (sym);
899 symbol_find (const char *name)
901 return symbol_find_noref (name, 0);
905 symbol_find_noref (const char *name, int noref)
910 #ifdef tc_canonicalize_symbol_name
912 copy = xstrdup (name);
913 name = tc_canonicalize_symbol_name (copy);
917 if (! symbols_case_sensitive)
926 name = copy = XNEWVEC (char, strlen (name) + 1);
928 while ((c = *orig++) != '\0')
929 *copy++ = TOUPPER (c);
934 copy = (char *) name;
937 result = symbol_find_exact_noref (name, noref);
943 /* Once upon a time, symbols were kept in a singly linked list. At
944 least coff needs to be able to rearrange them from time to time, for
945 which a doubly linked list is much more convenient. Loic did these
946 as macros which seemed dangerous to me so they're now functions.
949 /* Link symbol ADDME after symbol TARGET in the chain. */
952 symbol_append (symbolS *addme, symbolS *target,
953 symbolS **rootPP, symbolS **lastPP)
955 if (LOCAL_SYMBOL_CHECK (addme))
957 if (target != NULL && LOCAL_SYMBOL_CHECK (target))
962 know (*rootPP == NULL);
963 know (*lastPP == NULL);
964 addme->sy_next = NULL;
965 addme->sy_previous = NULL;
969 } /* if the list is empty */
971 if (target->sy_next != NULL)
973 target->sy_next->sy_previous = addme;
977 know (*lastPP == target);
979 } /* if we have a next */
981 addme->sy_next = target->sy_next;
982 target->sy_next = addme;
983 addme->sy_previous = target;
985 debug_verify_symchain (symbol_rootP, symbol_lastP);
988 /* Set the chain pointers of SYMBOL to null. */
991 symbol_clear_list_pointers (symbolS *symbolP)
993 if (LOCAL_SYMBOL_CHECK (symbolP))
995 symbolP->sy_next = NULL;
996 symbolP->sy_previous = NULL;
999 /* Remove SYMBOLP from the list. */
1002 symbol_remove (symbolS *symbolP, symbolS **rootPP, symbolS **lastPP)
1004 if (LOCAL_SYMBOL_CHECK (symbolP))
1007 if (symbolP == *rootPP)
1009 *rootPP = symbolP->sy_next;
1010 } /* if it was the root */
1012 if (symbolP == *lastPP)
1014 *lastPP = symbolP->sy_previous;
1015 } /* if it was the tail */
1017 if (symbolP->sy_next != NULL)
1019 symbolP->sy_next->sy_previous = symbolP->sy_previous;
1022 if (symbolP->sy_previous != NULL)
1024 symbolP->sy_previous->sy_next = symbolP->sy_next;
1025 } /* if not first */
1027 debug_verify_symchain (*rootPP, *lastPP);
1030 /* Link symbol ADDME before symbol TARGET in the chain. */
1033 symbol_insert (symbolS *addme, symbolS *target,
1034 symbolS **rootPP, symbolS **lastPP ATTRIBUTE_UNUSED)
1036 if (LOCAL_SYMBOL_CHECK (addme))
1038 if (LOCAL_SYMBOL_CHECK (target))
1041 if (target->sy_previous != NULL)
1043 target->sy_previous->sy_next = addme;
1047 know (*rootPP == target);
1049 } /* if not first */
1051 addme->sy_previous = target->sy_previous;
1052 target->sy_previous = addme;
1053 addme->sy_next = target;
1055 debug_verify_symchain (*rootPP, *lastPP);
1059 verify_symbol_chain (symbolS *rootP, symbolS *lastP)
1061 symbolS *symbolP = rootP;
1063 if (symbolP == NULL)
1066 for (; symbol_next (symbolP) != NULL; symbolP = symbol_next (symbolP))
1068 gas_assert (symbolP->bsym != NULL);
1069 gas_assert (symbolP->sy_flags.sy_local_symbol == 0);
1070 gas_assert (symbolP->sy_next->sy_previous == symbolP);
1073 gas_assert (lastP == symbolP);
1077 symbol_on_chain (symbolS *s, symbolS *rootPP, symbolS *lastPP)
1079 return (!LOCAL_SYMBOL_CHECK (s)
1080 && ((s->sy_next != s
1081 && s->sy_next != NULL
1082 && s->sy_next->sy_previous == s)
1084 && ((s->sy_previous != s
1085 && s->sy_previous != NULL
1086 && s->sy_previous->sy_next == s)
1090 #ifdef OBJ_COMPLEX_RELC
1093 use_complex_relocs_for (symbolS * symp)
1095 switch (symp->sy_value.X_op)
1105 if ( (S_IS_COMMON (symp->sy_value.X_add_symbol)
1106 || S_IS_LOCAL (symp->sy_value.X_add_symbol))
1108 (S_IS_DEFINED (symp->sy_value.X_add_symbol)
1109 && S_GET_SEGMENT (symp->sy_value.X_add_symbol) != expr_section))
1118 case O_bit_inclusive_or:
1120 case O_bit_exclusive_or:
1133 if ( (S_IS_COMMON (symp->sy_value.X_add_symbol)
1134 || S_IS_LOCAL (symp->sy_value.X_add_symbol))
1136 (S_IS_COMMON (symp->sy_value.X_op_symbol)
1137 || S_IS_LOCAL (symp->sy_value.X_op_symbol))
1139 && S_IS_DEFINED (symp->sy_value.X_add_symbol)
1140 && S_IS_DEFINED (symp->sy_value.X_op_symbol)
1141 && S_GET_SEGMENT (symp->sy_value.X_add_symbol) != expr_section
1142 && S_GET_SEGMENT (symp->sy_value.X_op_symbol) != expr_section)
1154 report_op_error (symbolS *symp, symbolS *left, operatorT op, symbolS *right)
1158 segT seg_left = left ? S_GET_SEGMENT (left) : 0;
1159 segT seg_right = S_GET_SEGMENT (right);
1168 case O_uminus: opname = "-"; break;
1169 case O_bit_not: opname = "~"; break;
1170 case O_logical_not: opname = "!"; break;
1171 case O_multiply: opname = "*"; break;
1172 case O_divide: opname = "/"; break;
1173 case O_modulus: opname = "%"; break;
1174 case O_left_shift: opname = "<<"; break;
1175 case O_right_shift: opname = ">>"; break;
1176 case O_bit_inclusive_or: opname = "|"; break;
1177 case O_bit_or_not: opname = "|~"; break;
1178 case O_bit_exclusive_or: opname = "^"; break;
1179 case O_bit_and: opname = "&"; break;
1180 case O_add: opname = "+"; break;
1181 case O_subtract: opname = "-"; break;
1182 case O_eq: opname = "=="; break;
1183 case O_ne: opname = "!="; break;
1184 case O_lt: opname = "<"; break;
1185 case O_le: opname = "<="; break;
1186 case O_ge: opname = ">="; break;
1187 case O_gt: opname = ">"; break;
1188 case O_logical_and: opname = "&&"; break;
1189 case O_logical_or: opname = "||"; break;
1192 if (expr_symbol_where (symp, &file, &line))
1195 as_bad_where (file, line,
1196 _("invalid operands (%s and %s sections) for `%s'"),
1197 seg_left->name, seg_right->name, opname);
1199 as_bad_where (file, line,
1200 _("invalid operand (%s section) for `%s'"),
1201 seg_right->name, opname);
1205 const char *sname = S_GET_NAME (symp);
1208 as_bad (_("invalid operands (%s and %s sections) for `%s' when setting `%s'"),
1209 seg_left->name, seg_right->name, opname, sname);
1211 as_bad (_("invalid operand (%s section) for `%s' when setting `%s'"),
1212 seg_right->name, opname, sname);
1216 /* Resolve the value of a symbol. This is called during the final
1217 pass over the symbol table to resolve any symbols with complex
1221 resolve_symbol_value (symbolS *symp)
1227 if (LOCAL_SYMBOL_CHECK (symp))
1229 struct local_symbol *locsym = (struct local_symbol *) symp;
1231 final_val = locsym->lsy_value;
1232 if (local_symbol_resolved_p (locsym))
1235 final_val += local_symbol_get_frag (locsym)->fr_address / OCTETS_PER_BYTE;
1239 locsym->lsy_value = final_val;
1240 local_symbol_mark_resolved (locsym);
1246 if (symp->sy_flags.sy_resolved)
1249 while (symp->sy_value.X_op == O_symbol
1250 && symp->sy_value.X_add_symbol->sy_flags.sy_resolved)
1252 final_val += symp->sy_value.X_add_number;
1253 symp = symp->sy_value.X_add_symbol;
1255 if (symp->sy_value.X_op == O_constant)
1256 final_val += symp->sy_value.X_add_number;
1263 final_seg = S_GET_SEGMENT (symp);
1265 if (symp->sy_flags.sy_resolving)
1268 as_bad (_("symbol definition loop encountered at `%s'"),
1273 #ifdef OBJ_COMPLEX_RELC
1274 else if (final_seg == expr_section
1275 && use_complex_relocs_for (symp))
1277 symbolS * relc_symbol = NULL;
1278 char * relc_symbol_name = NULL;
1280 relc_symbol_name = symbol_relc_make_expr (& symp->sy_value);
1282 /* For debugging, print out conversion input & output. */
1284 print_expr (& symp->sy_value);
1285 if (relc_symbol_name)
1286 fprintf (stderr, "-> relc symbol: %s\n", relc_symbol_name);
1289 if (relc_symbol_name != NULL)
1290 relc_symbol = symbol_new (relc_symbol_name, undefined_section,
1291 0, & zero_address_frag);
1293 if (relc_symbol == NULL)
1295 as_bad (_("cannot convert expression symbol %s to complex relocation"),
1301 symbol_table_insert (relc_symbol);
1303 /* S_CLEAR_EXTERNAL (relc_symbol); */
1304 if (symp->bsym->flags & BSF_SRELC)
1305 relc_symbol->bsym->flags |= BSF_SRELC;
1307 relc_symbol->bsym->flags |= BSF_RELC;
1308 /* symp->bsym->flags |= BSF_RELC; */
1309 copy_symbol_attributes (symp, relc_symbol);
1310 symp->sy_value.X_op = O_symbol;
1311 symp->sy_value.X_add_symbol = relc_symbol;
1312 symp->sy_value.X_add_number = 0;
1317 final_seg = undefined_section;
1318 goto exit_dont_set_value;
1323 symbolS *add_symbol, *op_symbol;
1324 offsetT left, right;
1325 segT seg_left, seg_right;
1329 symp->sy_flags.sy_resolving = 1;
1331 /* Help out with CSE. */
1332 add_symbol = symp->sy_value.X_add_symbol;
1333 op_symbol = symp->sy_value.X_op_symbol;
1334 final_val = symp->sy_value.X_add_number;
1335 op = symp->sy_value.X_op;
1348 if (symp->sy_flags.sy_octets)
1349 final_val += symp->sy_frag->fr_address;
1351 final_val += symp->sy_frag->fr_address / OCTETS_PER_BYTE;
1352 if (final_seg == expr_section)
1353 final_seg = absolute_section;
1362 left = resolve_symbol_value (add_symbol);
1363 seg_left = S_GET_SEGMENT (add_symbol);
1365 symp->sy_value.X_op_symbol = NULL;
1368 if (S_IS_WEAKREFR (symp))
1370 gas_assert (final_val == 0);
1371 if (S_IS_WEAKREFR (add_symbol))
1373 gas_assert (add_symbol->sy_value.X_op == O_symbol
1374 && add_symbol->sy_value.X_add_number == 0);
1375 add_symbol = add_symbol->sy_value.X_add_symbol;
1376 gas_assert (! S_IS_WEAKREFR (add_symbol));
1377 symp->sy_value.X_add_symbol = add_symbol;
1381 if (symp->sy_flags.sy_mri_common)
1383 /* This is a symbol inside an MRI common section. The
1384 relocation routines are going to handle it specially.
1385 Don't change the value. */
1386 resolved = symbol_resolved_p (add_symbol);
1390 if (finalize_syms && final_val == 0)
1392 if (LOCAL_SYMBOL_CHECK (add_symbol))
1393 add_symbol = local_symbol_convert ((struct local_symbol *)
1395 copy_symbol_attributes (symp, add_symbol);
1398 /* If we have equated this symbol to an undefined or common
1399 symbol, keep X_op set to O_symbol, and don't change
1400 X_add_number. This permits the routine which writes out
1401 relocation to detect this case, and convert the
1402 relocation to be against the symbol to which this symbol
1404 if (seg_left == undefined_section
1405 || bfd_is_com_section (seg_left)
1406 #if defined (OBJ_COFF) && defined (TE_PE)
1407 || S_IS_WEAK (add_symbol)
1410 && ((final_seg == expr_section
1411 && seg_left != expr_section
1412 && seg_left != absolute_section)
1413 || symbol_shadow_p (symp))))
1417 symp->sy_value.X_op = O_symbol;
1418 symp->sy_value.X_add_symbol = add_symbol;
1419 symp->sy_value.X_add_number = final_val;
1420 /* Use X_op_symbol as a flag. */
1421 symp->sy_value.X_op_symbol = add_symbol;
1423 final_seg = seg_left;
1424 final_val += symp->sy_frag->fr_address + left;
1425 resolved = symbol_resolved_p (add_symbol);
1426 symp->sy_flags.sy_resolving = 0;
1427 goto exit_dont_set_value;
1431 final_val += symp->sy_frag->fr_address + left;
1432 if (final_seg == expr_section || final_seg == undefined_section)
1433 final_seg = seg_left;
1436 resolved = symbol_resolved_p (add_symbol);
1437 if (S_IS_WEAKREFR (symp))
1439 symp->sy_flags.sy_resolving = 0;
1440 goto exit_dont_set_value;
1447 left = resolve_symbol_value (add_symbol);
1448 seg_left = S_GET_SEGMENT (add_symbol);
1450 /* By reducing these to the relevant dyadic operator, we get
1451 !S -> S == 0 permitted on anything,
1452 -S -> 0 - S only permitted on absolute
1453 ~S -> S ^ ~0 only permitted on absolute */
1454 if (op != O_logical_not && seg_left != absolute_section
1456 report_op_error (symp, NULL, op, add_symbol);
1458 if (final_seg == expr_section || final_seg == undefined_section)
1459 final_seg = absolute_section;
1463 else if (op == O_logical_not)
1468 final_val += left + symp->sy_frag->fr_address;
1470 resolved = symbol_resolved_p (add_symbol);
1478 case O_bit_inclusive_or:
1480 case O_bit_exclusive_or:
1492 left = resolve_symbol_value (add_symbol);
1493 right = resolve_symbol_value (op_symbol);
1494 seg_left = S_GET_SEGMENT (add_symbol);
1495 seg_right = S_GET_SEGMENT (op_symbol);
1497 /* Simplify addition or subtraction of a constant by folding the
1498 constant into X_add_number. */
1501 if (seg_right == absolute_section)
1506 else if (seg_left == absolute_section)
1509 add_symbol = op_symbol;
1511 seg_left = seg_right;
1515 else if (op == O_subtract)
1517 if (seg_right == absolute_section)
1525 /* Equality and non-equality tests are permitted on anything.
1526 Subtraction, and other comparison operators are permitted if
1527 both operands are in the same section. Otherwise, both
1528 operands must be absolute. We already handled the case of
1529 addition or subtraction of a constant above. This will
1530 probably need to be changed for an object file format which
1531 supports arbitrary expressions. */
1532 if (!(seg_left == absolute_section
1533 && seg_right == absolute_section)
1534 && !(op == O_eq || op == O_ne)
1535 && !((op == O_subtract
1536 || op == O_lt || op == O_le || op == O_ge || op == O_gt)
1537 && seg_left == seg_right
1538 && (seg_left != undefined_section
1539 || add_symbol == op_symbol)))
1541 /* Don't emit messages unless we're finalizing the symbol value,
1542 otherwise we may get the same message multiple times. */
1544 report_op_error (symp, add_symbol, op, op_symbol);
1545 /* However do not move the symbol into the absolute section
1546 if it cannot currently be resolved - this would confuse
1547 other parts of the assembler into believing that the
1548 expression had been evaluated to zero. */
1554 && (final_seg == expr_section || final_seg == undefined_section))
1555 final_seg = absolute_section;
1557 /* Check for division by zero. */
1558 if ((op == O_divide || op == O_modulus) && right == 0)
1560 /* If seg_right is not absolute_section, then we've
1561 already issued a warning about using a bad symbol. */
1562 if (seg_right == absolute_section && finalize_syms)
1567 if (expr_symbol_where (symp, &file, &line))
1568 as_bad_where (file, line, _("division by zero"));
1570 as_bad (_("division by zero when setting `%s'"),
1577 switch (symp->sy_value.X_op)
1579 case O_multiply: left *= right; break;
1580 case O_divide: left /= right; break;
1581 case O_modulus: left %= right; break;
1582 case O_left_shift: left <<= right; break;
1583 case O_right_shift: left >>= right; break;
1584 case O_bit_inclusive_or: left |= right; break;
1585 case O_bit_or_not: left |= ~right; break;
1586 case O_bit_exclusive_or: left ^= right; break;
1587 case O_bit_and: left &= right; break;
1588 case O_add: left += right; break;
1589 case O_subtract: left -= right; break;
1592 left = (left == right && seg_left == seg_right
1593 && (seg_left != undefined_section
1594 || add_symbol == op_symbol)
1595 ? ~ (offsetT) 0 : 0);
1596 if (symp->sy_value.X_op == O_ne)
1599 case O_lt: left = left < right ? ~ (offsetT) 0 : 0; break;
1600 case O_le: left = left <= right ? ~ (offsetT) 0 : 0; break;
1601 case O_ge: left = left >= right ? ~ (offsetT) 0 : 0; break;
1602 case O_gt: left = left > right ? ~ (offsetT) 0 : 0; break;
1603 case O_logical_and: left = left && right; break;
1604 case O_logical_or: left = left || right; break;
1609 /* See PR 20895 for a reproducer. */
1610 as_bad (_("Invalid operation on symbol"));
1611 goto exit_dont_set_value;
1617 final_val += symp->sy_frag->fr_address + left;
1618 if (final_seg == expr_section || final_seg == undefined_section)
1620 if (seg_left == undefined_section
1621 || seg_right == undefined_section)
1622 final_seg = undefined_section;
1623 else if (seg_left == absolute_section)
1624 final_seg = seg_right;
1626 final_seg = seg_left;
1628 resolved = (symbol_resolved_p (add_symbol)
1629 && symbol_resolved_p (op_symbol));
1634 /* Give an error (below) if not in expr_section. We don't
1635 want to worry about expr_section symbols, because they
1636 are fictional (they are created as part of expression
1637 resolution), and any problems may not actually mean
1642 symp->sy_flags.sy_resolving = 0;
1646 S_SET_VALUE (symp, final_val);
1648 exit_dont_set_value:
1649 /* Always set the segment, even if not finalizing the value.
1650 The segment is used to determine whether a symbol is defined. */
1651 S_SET_SEGMENT (symp, final_seg);
1653 /* Don't worry if we can't resolve an expr_section symbol. */
1657 symp->sy_flags.sy_resolved = 1;
1658 else if (S_GET_SEGMENT (symp) != expr_section)
1660 as_bad (_("can't resolve value for symbol `%s'"),
1662 symp->sy_flags.sy_resolved = 1;
1669 static void resolve_local_symbol (const char *, void *);
1671 /* A static function passed to hash_traverse. */
1674 resolve_local_symbol (const char *key ATTRIBUTE_UNUSED, void *value)
1677 resolve_symbol_value ((symbolS *) value);
1680 /* Resolve all local symbols. */
1683 resolve_local_symbol_values (void)
1685 hash_traverse (local_hash, resolve_local_symbol);
1688 /* Obtain the current value of a symbol without changing any
1689 sub-expressions used. */
1692 snapshot_symbol (symbolS **symbolPP, valueT *valueP, segT *segP, fragS **fragPP)
1694 symbolS *symbolP = *symbolPP;
1696 if (LOCAL_SYMBOL_CHECK (symbolP))
1698 struct local_symbol *locsym = (struct local_symbol *) symbolP;
1700 *valueP = locsym->lsy_value;
1701 *segP = locsym->lsy_section;
1702 *fragPP = local_symbol_get_frag (locsym);
1706 expressionS exp = symbolP->sy_value;
1708 if (!symbolP->sy_flags.sy_resolved && exp.X_op != O_illegal)
1712 if (symbolP->sy_flags.sy_resolving)
1714 symbolP->sy_flags.sy_resolving = 1;
1715 resolved = resolve_expression (&exp);
1716 symbolP->sy_flags.sy_resolving = 0;
1724 if (!symbol_equated_p (symbolP))
1729 symbolP = exp.X_add_symbol;
1736 *symbolPP = symbolP;
1738 /* A bogus input file can result in resolve_expression()
1739 generating a local symbol, so we have to check again. */
1740 if (LOCAL_SYMBOL_CHECK (symbolP))
1742 struct local_symbol *locsym = (struct local_symbol *) symbolP;
1744 *valueP = locsym->lsy_value;
1745 *segP = locsym->lsy_section;
1746 *fragPP = local_symbol_get_frag (locsym);
1750 *valueP = exp.X_add_number;
1751 *segP = symbolP->bsym->section;
1752 *fragPP = symbolP->sy_frag;
1755 if (*segP == expr_section)
1758 case O_constant: *segP = absolute_section; break;
1759 case O_register: *segP = reg_section; break;
1767 /* Dollar labels look like a number followed by a dollar sign. Eg, "42$".
1768 They are *really* local. That is, they go out of scope whenever we see a
1769 label that isn't local. Also, like fb labels, there can be multiple
1770 instances of a dollar label. Therefor, we name encode each instance with
1771 the instance number, keep a list of defined symbols separate from the real
1772 symbol table, and we treat these buggers as a sparse array. */
1774 static long *dollar_labels;
1775 static long *dollar_label_instances;
1776 static char *dollar_label_defines;
1777 static unsigned long dollar_label_count;
1778 static unsigned long dollar_label_max;
1781 dollar_label_defined (long label)
1785 know ((dollar_labels != NULL) || (dollar_label_count == 0));
1787 for (i = dollar_labels; i < dollar_labels + dollar_label_count; ++i)
1789 return dollar_label_defines[i - dollar_labels];
1791 /* If we get here, label isn't defined. */
1796 dollar_label_instance (long label)
1800 know ((dollar_labels != NULL) || (dollar_label_count == 0));
1802 for (i = dollar_labels; i < dollar_labels + dollar_label_count; ++i)
1804 return (dollar_label_instances[i - dollar_labels]);
1806 /* If we get here, we haven't seen the label before.
1807 Therefore its instance count is zero. */
1812 dollar_label_clear (void)
1814 memset (dollar_label_defines, '\0', (unsigned int) dollar_label_count);
1817 #define DOLLAR_LABEL_BUMP_BY 10
1820 define_dollar_label (long label)
1824 for (i = dollar_labels; i < dollar_labels + dollar_label_count; ++i)
1827 ++dollar_label_instances[i - dollar_labels];
1828 dollar_label_defines[i - dollar_labels] = 1;
1832 /* If we get to here, we don't have label listed yet. */
1834 if (dollar_labels == NULL)
1836 dollar_labels = XNEWVEC (long, DOLLAR_LABEL_BUMP_BY);
1837 dollar_label_instances = XNEWVEC (long, DOLLAR_LABEL_BUMP_BY);
1838 dollar_label_defines = XNEWVEC (char, DOLLAR_LABEL_BUMP_BY);
1839 dollar_label_max = DOLLAR_LABEL_BUMP_BY;
1840 dollar_label_count = 0;
1842 else if (dollar_label_count == dollar_label_max)
1844 dollar_label_max += DOLLAR_LABEL_BUMP_BY;
1845 dollar_labels = XRESIZEVEC (long, dollar_labels, dollar_label_max);
1846 dollar_label_instances = XRESIZEVEC (long, dollar_label_instances,
1848 dollar_label_defines = XRESIZEVEC (char, dollar_label_defines,
1850 } /* if we needed to grow */
1852 dollar_labels[dollar_label_count] = label;
1853 dollar_label_instances[dollar_label_count] = 1;
1854 dollar_label_defines[dollar_label_count] = 1;
1855 ++dollar_label_count;
1858 /* Caller must copy returned name: we re-use the area for the next name.
1860 The mth occurrence of label n: is turned into the symbol "Ln^Am"
1861 where n is the label number and m is the instance number. "L" makes
1862 it a label discarded unless debugging and "^A"('\1') ensures no
1863 ordinary symbol SHOULD get the same name as a local label
1864 symbol. The first "4:" is "L4^A1" - the m numbers begin at 1.
1866 fb labels get the same treatment, except that ^B is used in place
1869 char * /* Return local label name. */
1870 dollar_label_name (long n, /* we just saw "n$:" : n a number. */
1871 int augend /* 0 for current instance, 1 for new instance. */)
1874 /* Returned to caller, then copied. Used for created names ("4f"). */
1875 static char symbol_name_build[24];
1878 char symbol_name_temporary[20]; /* Build up a number, BACKWARDS. */
1881 know (augend == 0 || augend == 1);
1882 p = symbol_name_build;
1883 #ifdef LOCAL_LABEL_PREFIX
1884 *p++ = LOCAL_LABEL_PREFIX;
1888 /* Next code just does sprintf( {}, "%d", n); */
1890 q = symbol_name_temporary;
1891 for (*q++ = 0, i = n; i; ++q)
1896 while ((*p = *--q) != '\0')
1899 *p++ = DOLLAR_LABEL_CHAR; /* ^A */
1901 /* Instance number. */
1902 q = symbol_name_temporary;
1903 for (*q++ = 0, i = dollar_label_instance (n) + augend; i; ++q)
1908 while ((*p++ = *--q) != '\0');
1910 /* The label, as a '\0' ended string, starts at symbol_name_build. */
1911 return symbol_name_build;
1914 /* Somebody else's idea of local labels. They are made by "n:" where n
1915 is any decimal digit. Refer to them with
1916 "nb" for previous (backward) n:
1917 or "nf" for next (forward) n:.
1919 We do a little better and let n be any number, not just a single digit, but
1920 since the other guy's assembler only does ten, we treat the first ten
1923 Like someone else's assembler, we have one set of local label counters for
1924 entire assembly, not one set per (sub)segment like in most assemblers. This
1925 implies that one can refer to a label in another segment, and indeed some
1926 crufty compilers have done just that.
1928 Since there could be a LOT of these things, treat them as a sparse
1931 #define FB_LABEL_SPECIAL (10)
1933 static long fb_low_counter[FB_LABEL_SPECIAL];
1934 static long *fb_labels;
1935 static long *fb_label_instances;
1936 static long fb_label_count;
1937 static long fb_label_max;
1939 /* This must be more than FB_LABEL_SPECIAL. */
1940 #define FB_LABEL_BUMP_BY (FB_LABEL_SPECIAL + 6)
1943 fb_label_init (void)
1945 memset ((void *) fb_low_counter, '\0', sizeof (fb_low_counter));
1948 /* Add one to the instance number of this fb label. */
1951 fb_label_instance_inc (long label)
1955 if ((unsigned long) label < FB_LABEL_SPECIAL)
1957 ++fb_low_counter[label];
1961 if (fb_labels != NULL)
1963 for (i = fb_labels + FB_LABEL_SPECIAL;
1964 i < fb_labels + fb_label_count; ++i)
1968 ++fb_label_instances[i - fb_labels];
1970 } /* if we find it */
1971 } /* for each existing label */
1974 /* If we get to here, we don't have label listed yet. */
1976 if (fb_labels == NULL)
1978 fb_labels = XNEWVEC (long, FB_LABEL_BUMP_BY);
1979 fb_label_instances = XNEWVEC (long, FB_LABEL_BUMP_BY);
1980 fb_label_max = FB_LABEL_BUMP_BY;
1981 fb_label_count = FB_LABEL_SPECIAL;
1984 else if (fb_label_count == fb_label_max)
1986 fb_label_max += FB_LABEL_BUMP_BY;
1987 fb_labels = XRESIZEVEC (long, fb_labels, fb_label_max);
1988 fb_label_instances = XRESIZEVEC (long, fb_label_instances, fb_label_max);
1989 } /* if we needed to grow */
1991 fb_labels[fb_label_count] = label;
1992 fb_label_instances[fb_label_count] = 1;
1997 fb_label_instance (long label)
2001 if ((unsigned long) label < FB_LABEL_SPECIAL)
2003 return (fb_low_counter[label]);
2006 if (fb_labels != NULL)
2008 for (i = fb_labels + FB_LABEL_SPECIAL;
2009 i < fb_labels + fb_label_count; ++i)
2013 return (fb_label_instances[i - fb_labels]);
2014 } /* if we find it */
2015 } /* for each existing label */
2018 /* We didn't find the label, so this must be a reference to the
2023 /* Caller must copy returned name: we re-use the area for the next name.
2025 The mth occurrence of label n: is turned into the symbol "Ln^Bm"
2026 where n is the label number and m is the instance number. "L" makes
2027 it a label discarded unless debugging and "^B"('\2') ensures no
2028 ordinary symbol SHOULD get the same name as a local label
2029 symbol. The first "4:" is "L4^B1" - the m numbers begin at 1.
2031 dollar labels get the same treatment, except that ^A is used in
2034 char * /* Return local label name. */
2035 fb_label_name (long n, /* We just saw "n:", "nf" or "nb" : n a number. */
2036 long augend /* 0 for nb, 1 for n:, nf. */)
2039 /* Returned to caller, then copied. Used for created names ("4f"). */
2040 static char symbol_name_build[24];
2043 char symbol_name_temporary[20]; /* Build up a number, BACKWARDS. */
2047 know ((unsigned long) augend <= 2 /* See mmix_fb_label. */);
2049 know ((unsigned long) augend <= 1);
2051 p = symbol_name_build;
2052 #ifdef LOCAL_LABEL_PREFIX
2053 *p++ = LOCAL_LABEL_PREFIX;
2057 /* Next code just does sprintf( {}, "%d", n); */
2059 q = symbol_name_temporary;
2060 for (*q++ = 0, i = n; i; ++q)
2065 while ((*p = *--q) != '\0')
2068 *p++ = LOCAL_LABEL_CHAR; /* ^B */
2070 /* Instance number. */
2071 q = symbol_name_temporary;
2072 for (*q++ = 0, i = fb_label_instance (n) + augend; i; ++q)
2077 while ((*p++ = *--q) != '\0');
2079 /* The label, as a '\0' ended string, starts at symbol_name_build. */
2080 return (symbol_name_build);
2083 /* Decode name that may have been generated by foo_label_name() above.
2084 If the name wasn't generated by foo_label_name(), then return it
2085 unaltered. This is used for error messages. */
2088 decode_local_label_name (char *s)
2091 char *symbol_decode;
2093 int instance_number;
2095 const char *message_format;
2098 #ifdef LOCAL_LABEL_PREFIX
2099 if (s[lindex] == LOCAL_LABEL_PREFIX)
2103 if (s[lindex] != 'L')
2106 for (label_number = 0, p = s + lindex + 1; ISDIGIT (*p); ++p)
2107 label_number = (10 * label_number) + *p - '0';
2109 if (*p == DOLLAR_LABEL_CHAR)
2111 else if (*p == LOCAL_LABEL_CHAR)
2116 for (instance_number = 0, p++; ISDIGIT (*p); ++p)
2117 instance_number = (10 * instance_number) + *p - '0';
2119 message_format = _("\"%d\" (instance number %d of a %s label)");
2120 symbol_decode = (char *) obstack_alloc (¬es, strlen (message_format) + 30);
2121 sprintf (symbol_decode, message_format, label_number, instance_number, type);
2123 return symbol_decode;
2126 /* Get the value of a symbol. */
2129 S_GET_VALUE (symbolS *s)
2131 if (LOCAL_SYMBOL_CHECK (s))
2132 return resolve_symbol_value (s);
2134 if (!s->sy_flags.sy_resolved)
2136 valueT val = resolve_symbol_value (s);
2140 if (S_IS_WEAKREFR (s))
2141 return S_GET_VALUE (s->sy_value.X_add_symbol);
2143 if (s->sy_value.X_op != O_constant)
2145 if (! s->sy_flags.sy_resolved
2146 || s->sy_value.X_op != O_symbol
2147 || (S_IS_DEFINED (s) && ! S_IS_COMMON (s)))
2148 as_bad (_("attempt to get value of unresolved symbol `%s'"),
2151 return (valueT) s->sy_value.X_add_number;
2154 /* Set the value of a symbol. */
2157 S_SET_VALUE (symbolS *s, valueT val)
2159 if (LOCAL_SYMBOL_CHECK (s))
2161 ((struct local_symbol *) s)->lsy_value = val;
2165 s->sy_value.X_op = O_constant;
2166 s->sy_value.X_add_number = (offsetT) val;
2167 s->sy_value.X_unsigned = 0;
2168 S_CLEAR_WEAKREFR (s);
2172 copy_symbol_attributes (symbolS *dest, symbolS *src)
2174 if (LOCAL_SYMBOL_CHECK (dest))
2175 dest = local_symbol_convert ((struct local_symbol *) dest);
2176 if (LOCAL_SYMBOL_CHECK (src))
2177 src = local_symbol_convert ((struct local_symbol *) src);
2179 /* In an expression, transfer the settings of these flags.
2180 The user can override later, of course. */
2181 #define COPIED_SYMFLAGS (BSF_FUNCTION | BSF_OBJECT \
2182 | BSF_GNU_INDIRECT_FUNCTION)
2183 dest->bsym->flags |= src->bsym->flags & COPIED_SYMFLAGS;
2185 #ifdef OBJ_COPY_SYMBOL_ATTRIBUTES
2186 OBJ_COPY_SYMBOL_ATTRIBUTES (dest, src);
2189 #ifdef TC_COPY_SYMBOL_ATTRIBUTES
2190 TC_COPY_SYMBOL_ATTRIBUTES (dest, src);
2195 S_IS_FUNCTION (symbolS *s)
2199 if (LOCAL_SYMBOL_CHECK (s))
2202 flags = s->bsym->flags;
2204 return (flags & BSF_FUNCTION) != 0;
2208 S_IS_EXTERNAL (symbolS *s)
2212 if (LOCAL_SYMBOL_CHECK (s))
2215 flags = s->bsym->flags;
2218 if ((flags & BSF_LOCAL) && (flags & BSF_GLOBAL))
2221 return (flags & BSF_GLOBAL) != 0;
2225 S_IS_WEAK (symbolS *s)
2227 if (LOCAL_SYMBOL_CHECK (s))
2229 /* Conceptually, a weakrefr is weak if the referenced symbol is. We
2230 could probably handle a WEAKREFR as always weak though. E.g., if
2231 the referenced symbol has lost its weak status, there's no reason
2232 to keep handling the weakrefr as if it was weak. */
2233 if (S_IS_WEAKREFR (s))
2234 return S_IS_WEAK (s->sy_value.X_add_symbol);
2235 return (s->bsym->flags & BSF_WEAK) != 0;
2239 S_IS_WEAKREFR (symbolS *s)
2241 if (LOCAL_SYMBOL_CHECK (s))
2243 return s->sy_flags.sy_weakrefr != 0;
2247 S_IS_WEAKREFD (symbolS *s)
2249 if (LOCAL_SYMBOL_CHECK (s))
2251 return s->sy_flags.sy_weakrefd != 0;
2255 S_IS_COMMON (symbolS *s)
2257 if (LOCAL_SYMBOL_CHECK (s))
2259 return bfd_is_com_section (s->bsym->section);
2263 S_IS_DEFINED (symbolS *s)
2265 if (LOCAL_SYMBOL_CHECK (s))
2266 return ((struct local_symbol *) s)->lsy_section != undefined_section;
2267 return s->bsym->section != undefined_section;
2271 #ifndef EXTERN_FORCE_RELOC
2272 #define EXTERN_FORCE_RELOC IS_ELF
2275 /* Return true for symbols that should not be reduced to section
2276 symbols or eliminated from expressions, because they may be
2277 overridden by the linker. */
2279 S_FORCE_RELOC (symbolS *s, int strict)
2282 if (LOCAL_SYMBOL_CHECK (s))
2283 sec = ((struct local_symbol *) s)->lsy_section;
2287 && ((s->bsym->flags & BSF_WEAK) != 0
2288 || (EXTERN_FORCE_RELOC
2289 && (s->bsym->flags & BSF_GLOBAL) != 0)))
2290 || (s->bsym->flags & BSF_GNU_INDIRECT_FUNCTION) != 0)
2292 sec = s->bsym->section;
2294 return bfd_is_und_section (sec) || bfd_is_com_section (sec);
2298 S_IS_DEBUG (symbolS *s)
2300 if (LOCAL_SYMBOL_CHECK (s))
2302 if (s->bsym->flags & BSF_DEBUGGING)
2308 S_IS_LOCAL (symbolS *s)
2313 if (LOCAL_SYMBOL_CHECK (s))
2316 flags = s->bsym->flags;
2319 if ((flags & BSF_LOCAL) && (flags & BSF_GLOBAL))
2322 if (bfd_get_section (s->bsym) == reg_section)
2325 if (flag_strip_local_absolute
2326 /* Keep BSF_FILE symbols in order to allow debuggers to identify
2327 the source file even when the object file is stripped. */
2328 && (flags & (BSF_GLOBAL | BSF_FILE)) == 0
2329 && bfd_get_section (s->bsym) == absolute_section)
2332 name = S_GET_NAME (s);
2333 return (name != NULL
2335 && (strchr (name, DOLLAR_LABEL_CHAR)
2336 || strchr (name, LOCAL_LABEL_CHAR)
2337 #if FAKE_LABEL_CHAR != DOLLAR_LABEL_CHAR
2338 || strchr (name, FAKE_LABEL_CHAR)
2340 || TC_LABEL_IS_LOCAL (name)
2341 || (! flag_keep_locals
2342 && (bfd_is_local_label (stdoutput, s->bsym)
2345 && name[1] == '?')))));
2349 S_IS_STABD (symbolS *s)
2351 return S_GET_NAME (s) == 0;
2355 S_CAN_BE_REDEFINED (const symbolS *s)
2357 if (LOCAL_SYMBOL_CHECK (s))
2358 return (local_symbol_get_frag ((struct local_symbol *) s)
2359 == &predefined_address_frag);
2360 /* Permit register names to be redefined. */
2361 return s->bsym->section == reg_section;
2365 S_IS_VOLATILE (const symbolS *s)
2367 if (LOCAL_SYMBOL_CHECK (s))
2369 return s->sy_flags.sy_volatile;
2373 S_IS_FORWARD_REF (const symbolS *s)
2375 if (LOCAL_SYMBOL_CHECK (s))
2377 return s->sy_flags.sy_forward_ref;
2381 S_GET_NAME (symbolS *s)
2383 if (LOCAL_SYMBOL_CHECK (s))
2384 return ((struct local_symbol *) s)->lsy_name;
2385 return s->bsym->name;
2389 S_GET_SEGMENT (symbolS *s)
2391 if (LOCAL_SYMBOL_CHECK (s))
2392 return ((struct local_symbol *) s)->lsy_section;
2393 return s->bsym->section;
2397 S_SET_SEGMENT (symbolS *s, segT seg)
2399 /* Don't reassign section symbols. The direct reason is to prevent seg
2400 faults assigning back to const global symbols such as *ABS*, but it
2401 shouldn't happen anyway. */
2403 if (LOCAL_SYMBOL_CHECK (s))
2405 if (seg == reg_section)
2406 s = local_symbol_convert ((struct local_symbol *) s);
2409 ((struct local_symbol *) s)->lsy_section = seg;
2414 if (s->bsym->flags & BSF_SECTION_SYM)
2416 if (s->bsym->section != seg)
2420 s->bsym->section = seg;
2424 S_SET_EXTERNAL (symbolS *s)
2426 if (LOCAL_SYMBOL_CHECK (s))
2427 s = local_symbol_convert ((struct local_symbol *) s);
2428 if ((s->bsym->flags & BSF_WEAK) != 0)
2430 /* Let .weak override .global. */
2433 if (s->bsym->flags & BSF_SECTION_SYM)
2435 /* Do not reassign section symbols. */
2436 as_warn (_("section symbols are already global"));
2439 #ifndef TC_GLOBAL_REGISTER_SYMBOL_OK
2440 if (S_GET_SEGMENT (s) == reg_section)
2442 as_bad ("can't make register symbol `%s' global",
2447 s->bsym->flags |= BSF_GLOBAL;
2448 s->bsym->flags &= ~(BSF_LOCAL | BSF_WEAK);
2451 if (! an_external_name && S_GET_NAME(s)[0] != '.')
2452 an_external_name = S_GET_NAME (s);
2457 S_CLEAR_EXTERNAL (symbolS *s)
2459 if (LOCAL_SYMBOL_CHECK (s))
2461 if ((s->bsym->flags & BSF_WEAK) != 0)
2463 /* Let .weak override. */
2466 s->bsym->flags |= BSF_LOCAL;
2467 s->bsym->flags &= ~(BSF_GLOBAL | BSF_WEAK);
2471 S_SET_WEAK (symbolS *s)
2473 if (LOCAL_SYMBOL_CHECK (s))
2474 s = local_symbol_convert ((struct local_symbol *) s);
2475 #ifdef obj_set_weak_hook
2476 obj_set_weak_hook (s);
2478 s->bsym->flags |= BSF_WEAK;
2479 s->bsym->flags &= ~(BSF_GLOBAL | BSF_LOCAL);
2483 S_SET_WEAKREFR (symbolS *s)
2485 if (LOCAL_SYMBOL_CHECK (s))
2486 s = local_symbol_convert ((struct local_symbol *) s);
2487 s->sy_flags.sy_weakrefr = 1;
2488 /* If the alias was already used, make sure we mark the target as
2489 used as well, otherwise it might be dropped from the symbol
2490 table. This may have unintended side effects if the alias is
2491 later redirected to another symbol, such as keeping the unused
2492 previous target in the symbol table. Since it will be weak, it's
2494 if (s->sy_flags.sy_used)
2495 symbol_mark_used (s->sy_value.X_add_symbol);
2499 S_CLEAR_WEAKREFR (symbolS *s)
2501 if (LOCAL_SYMBOL_CHECK (s))
2503 s->sy_flags.sy_weakrefr = 0;
2507 S_SET_WEAKREFD (symbolS *s)
2509 if (LOCAL_SYMBOL_CHECK (s))
2510 s = local_symbol_convert ((struct local_symbol *) s);
2511 s->sy_flags.sy_weakrefd = 1;
2516 S_CLEAR_WEAKREFD (symbolS *s)
2518 if (LOCAL_SYMBOL_CHECK (s))
2520 if (s->sy_flags.sy_weakrefd)
2522 s->sy_flags.sy_weakrefd = 0;
2523 /* If a weakref target symbol is weak, then it was never
2524 referenced directly before, not even in a .global directive,
2525 so decay it to local. If it remains undefined, it will be
2526 later turned into a global, like any other undefined
2528 if (s->bsym->flags & BSF_WEAK)
2530 #ifdef obj_clear_weak_hook
2531 obj_clear_weak_hook (s);
2533 s->bsym->flags &= ~BSF_WEAK;
2534 s->bsym->flags |= BSF_LOCAL;
2540 S_SET_THREAD_LOCAL (symbolS *s)
2542 if (LOCAL_SYMBOL_CHECK (s))
2543 s = local_symbol_convert ((struct local_symbol *) s);
2544 if (bfd_is_com_section (s->bsym->section)
2545 && (s->bsym->flags & BSF_THREAD_LOCAL) != 0)
2547 s->bsym->flags |= BSF_THREAD_LOCAL;
2548 if ((s->bsym->flags & BSF_FUNCTION) != 0)
2549 as_bad (_("Accessing function `%s' as thread-local object"),
2551 else if (! bfd_is_und_section (s->bsym->section)
2552 && (s->bsym->section->flags & SEC_THREAD_LOCAL) == 0)
2553 as_bad (_("Accessing `%s' as thread-local object"),
2558 S_SET_NAME (symbolS *s, const char *name)
2560 if (LOCAL_SYMBOL_CHECK (s))
2562 ((struct local_symbol *) s)->lsy_name = name;
2565 s->bsym->name = name;
2569 S_SET_VOLATILE (symbolS *s)
2571 if (LOCAL_SYMBOL_CHECK (s))
2572 s = local_symbol_convert ((struct local_symbol *) s);
2573 s->sy_flags.sy_volatile = 1;
2577 S_CLEAR_VOLATILE (symbolS *s)
2579 if (!LOCAL_SYMBOL_CHECK (s))
2580 s->sy_flags.sy_volatile = 0;
2584 S_SET_FORWARD_REF (symbolS *s)
2586 if (LOCAL_SYMBOL_CHECK (s))
2587 s = local_symbol_convert ((struct local_symbol *) s);
2588 s->sy_flags.sy_forward_ref = 1;
2591 /* Return the previous symbol in a chain. */
2594 symbol_previous (symbolS *s)
2596 if (LOCAL_SYMBOL_CHECK (s))
2598 return s->sy_previous;
2601 /* Return the next symbol in a chain. */
2604 symbol_next (symbolS *s)
2606 if (LOCAL_SYMBOL_CHECK (s))
2611 /* Return a pointer to the value of a symbol as an expression. */
2614 symbol_get_value_expression (symbolS *s)
2616 if (LOCAL_SYMBOL_CHECK (s))
2617 s = local_symbol_convert ((struct local_symbol *) s);
2618 return &s->sy_value;
2621 /* Set the value of a symbol to an expression. */
2624 symbol_set_value_expression (symbolS *s, const expressionS *exp)
2626 if (LOCAL_SYMBOL_CHECK (s))
2627 s = local_symbol_convert ((struct local_symbol *) s);
2629 S_CLEAR_WEAKREFR (s);
2632 /* Return whether 2 symbols are the same. */
2635 symbol_same_p (symbolS *s1, symbolS *s2)
2637 s1 = get_real_sym (s1);
2638 s2 = get_real_sym (s2);
2642 /* Return a pointer to the X_add_number component of a symbol. */
2645 symbol_X_add_number (symbolS *s)
2647 if (LOCAL_SYMBOL_CHECK (s))
2648 return (offsetT *) &((struct local_symbol *) s)->lsy_value;
2650 return &s->sy_value.X_add_number;
2653 /* Set the value of SYM to the current position in the current segment. */
2656 symbol_set_value_now (symbolS *sym)
2658 S_SET_SEGMENT (sym, now_seg);
2659 S_SET_VALUE (sym, frag_now_fix ());
2660 symbol_set_frag (sym, frag_now);
2663 /* Set the value of SYM to the current position in the current segment,
2667 symbol_set_value_now_octets (symbolS *sym)
2669 S_SET_SEGMENT (sym, now_seg);
2670 S_SET_VALUE (sym, frag_now_fix_octets ());
2671 symbol_set_frag (sym, frag_now);
2672 sym->sy_flags.sy_octets = 1;
2675 /* Set the frag of a symbol. */
2678 symbol_set_frag (symbolS *s, fragS *f)
2680 if (LOCAL_SYMBOL_CHECK (s))
2682 local_symbol_set_frag ((struct local_symbol *) s, f);
2686 S_CLEAR_WEAKREFR (s);
2689 /* Return the frag of a symbol. */
2692 symbol_get_frag (symbolS *s)
2694 if (LOCAL_SYMBOL_CHECK (s))
2695 return local_symbol_get_frag ((struct local_symbol *) s);
2699 /* Mark a symbol as having been used. */
2702 symbol_mark_used (symbolS *s)
2704 if (LOCAL_SYMBOL_CHECK (s))
2706 s->sy_flags.sy_used = 1;
2707 if (S_IS_WEAKREFR (s))
2708 symbol_mark_used (s->sy_value.X_add_symbol);
2711 /* Clear the mark of whether a symbol has been used. */
2714 symbol_clear_used (symbolS *s)
2716 if (LOCAL_SYMBOL_CHECK (s))
2717 s = local_symbol_convert ((struct local_symbol *) s);
2718 s->sy_flags.sy_used = 0;
2721 /* Return whether a symbol has been used. */
2724 symbol_used_p (symbolS *s)
2726 if (LOCAL_SYMBOL_CHECK (s))
2728 return s->sy_flags.sy_used;
2731 /* Mark a symbol as having been used in a reloc. */
2734 symbol_mark_used_in_reloc (symbolS *s)
2736 if (LOCAL_SYMBOL_CHECK (s))
2737 s = local_symbol_convert ((struct local_symbol *) s);
2738 s->sy_flags.sy_used_in_reloc = 1;
2741 /* Clear the mark of whether a symbol has been used in a reloc. */
2744 symbol_clear_used_in_reloc (symbolS *s)
2746 if (LOCAL_SYMBOL_CHECK (s))
2748 s->sy_flags.sy_used_in_reloc = 0;
2751 /* Return whether a symbol has been used in a reloc. */
2754 symbol_used_in_reloc_p (symbolS *s)
2756 if (LOCAL_SYMBOL_CHECK (s))
2758 return s->sy_flags.sy_used_in_reloc;
2761 /* Mark a symbol as an MRI common symbol. */
2764 symbol_mark_mri_common (symbolS *s)
2766 if (LOCAL_SYMBOL_CHECK (s))
2767 s = local_symbol_convert ((struct local_symbol *) s);
2768 s->sy_flags.sy_mri_common = 1;
2771 /* Clear the mark of whether a symbol is an MRI common symbol. */
2774 symbol_clear_mri_common (symbolS *s)
2776 if (LOCAL_SYMBOL_CHECK (s))
2778 s->sy_flags.sy_mri_common = 0;
2781 /* Return whether a symbol is an MRI common symbol. */
2784 symbol_mri_common_p (symbolS *s)
2786 if (LOCAL_SYMBOL_CHECK (s))
2788 return s->sy_flags.sy_mri_common;
2791 /* Mark a symbol as having been written. */
2794 symbol_mark_written (symbolS *s)
2796 if (LOCAL_SYMBOL_CHECK (s))
2798 s->sy_flags.sy_written = 1;
2801 /* Clear the mark of whether a symbol has been written. */
2804 symbol_clear_written (symbolS *s)
2806 if (LOCAL_SYMBOL_CHECK (s))
2808 s->sy_flags.sy_written = 0;
2811 /* Return whether a symbol has been written. */
2814 symbol_written_p (symbolS *s)
2816 if (LOCAL_SYMBOL_CHECK (s))
2818 return s->sy_flags.sy_written;
2821 /* Mark a symbol has having been resolved. */
2824 symbol_mark_resolved (symbolS *s)
2826 if (LOCAL_SYMBOL_CHECK (s))
2828 local_symbol_mark_resolved ((struct local_symbol *) s);
2831 s->sy_flags.sy_resolved = 1;
2834 /* Return whether a symbol has been resolved. */
2837 symbol_resolved_p (symbolS *s)
2839 if (LOCAL_SYMBOL_CHECK (s))
2840 return local_symbol_resolved_p ((struct local_symbol *) s);
2841 return s->sy_flags.sy_resolved;
2844 /* Return whether a symbol is a section symbol. */
2847 symbol_section_p (symbolS *s ATTRIBUTE_UNUSED)
2849 if (LOCAL_SYMBOL_CHECK (s))
2851 return (s->bsym->flags & BSF_SECTION_SYM) != 0;
2854 /* Return whether a symbol is equated to another symbol. */
2857 symbol_equated_p (symbolS *s)
2859 if (LOCAL_SYMBOL_CHECK (s))
2861 return s->sy_value.X_op == O_symbol;
2864 /* Return whether a symbol is equated to another symbol, and should be
2865 treated specially when writing out relocs. */
2868 symbol_equated_reloc_p (symbolS *s)
2870 if (LOCAL_SYMBOL_CHECK (s))
2872 /* X_op_symbol, normally not used for O_symbol, is set by
2873 resolve_symbol_value to flag expression syms that have been
2875 return (s->sy_value.X_op == O_symbol
2876 #if defined (OBJ_COFF) && defined (TE_PE)
2879 && ((s->sy_flags.sy_resolved && s->sy_value.X_op_symbol != NULL)
2880 || ! S_IS_DEFINED (s)
2881 || S_IS_COMMON (s)));
2884 /* Return whether a symbol has a constant value. */
2887 symbol_constant_p (symbolS *s)
2889 if (LOCAL_SYMBOL_CHECK (s))
2891 return s->sy_value.X_op == O_constant;
2894 /* Return whether a symbol was cloned and thus removed from the global
2898 symbol_shadow_p (symbolS *s)
2900 if (LOCAL_SYMBOL_CHECK (s))
2902 return s->sy_next == s;
2905 /* If S was created as a struct symbol, return S, otherwise if S is a
2906 converted local_symbol return the converted symbol, otherwise
2910 symbol_symbolS (symbolS *s)
2912 if (LOCAL_SYMBOL_CHECK (s))
2917 /* Return the BFD symbol for a symbol. */
2920 symbol_get_bfdsym (symbolS *s)
2922 if (LOCAL_SYMBOL_CHECK (s))
2923 s = local_symbol_convert ((struct local_symbol *) s);
2927 /* Set the BFD symbol for a symbol. */
2930 symbol_set_bfdsym (symbolS *s, asymbol *bsym)
2932 if (LOCAL_SYMBOL_CHECK (s))
2933 s = local_symbol_convert ((struct local_symbol *) s);
2934 /* Usually, it is harmless to reset a symbol to a BFD section
2935 symbol. For example, obj_elf_change_section sets the BFD symbol
2936 of an old symbol with the newly created section symbol. But when
2937 we have multiple sections with the same name, the newly created
2938 section may have the same name as an old section. We check if the
2939 old symbol has been already marked as a section symbol before
2941 if ((s->bsym->flags & BSF_SECTION_SYM) == 0)
2943 /* else XXX - What do we do now ? */
2946 /* Return whether symbol unit is "octets" (instead of "bytes"). */
2948 int symbol_octets_p (symbolS *s)
2950 return s->sy_flags.sy_octets;
2953 #ifdef OBJ_SYMFIELD_TYPE
2955 /* Get a pointer to the object format information for a symbol. */
2958 symbol_get_obj (symbolS *s)
2960 if (LOCAL_SYMBOL_CHECK (s))
2961 s = local_symbol_convert ((struct local_symbol *) s);
2965 /* Set the object format information for a symbol. */
2968 symbol_set_obj (symbolS *s, OBJ_SYMFIELD_TYPE *o)
2970 if (LOCAL_SYMBOL_CHECK (s))
2971 s = local_symbol_convert ((struct local_symbol *) s);
2975 #endif /* OBJ_SYMFIELD_TYPE */
2977 #ifdef TC_SYMFIELD_TYPE
2979 /* Get a pointer to the processor information for a symbol. */
2982 symbol_get_tc (symbolS *s)
2984 if (LOCAL_SYMBOL_CHECK (s))
2985 s = local_symbol_convert ((struct local_symbol *) s);
2989 /* Set the processor information for a symbol. */
2992 symbol_set_tc (symbolS *s, TC_SYMFIELD_TYPE *o)
2994 if (LOCAL_SYMBOL_CHECK (s))
2995 s = local_symbol_convert ((struct local_symbol *) s);
2999 #endif /* TC_SYMFIELD_TYPE */
3004 symbol_lastP = NULL;
3005 symbol_rootP = NULL; /* In case we have 0 symbols (!!) */
3006 sy_hash = hash_new ();
3007 local_hash = hash_new ();
3009 memset ((char *) (&abs_symbol), '\0', sizeof (abs_symbol));
3010 #if defined (EMIT_SECTION_SYMBOLS) || !defined (RELOC_REQUIRES_SYMBOL)
3011 abs_symbol.bsym = bfd_abs_section_ptr->symbol;
3013 abs_symbol.sy_value.X_op = O_constant;
3014 abs_symbol.sy_frag = &zero_address_frag;
3016 if (LOCAL_LABELS_FB)
3021 dot_symbol_init (void)
3023 dot_symbol.bsym = bfd_make_empty_symbol (stdoutput);
3024 if (dot_symbol.bsym == NULL)
3025 as_fatal ("bfd_make_empty_symbol: %s", bfd_errmsg (bfd_get_error ()));
3026 dot_symbol.bsym->name = ".";
3027 dot_symbol.sy_flags.sy_forward_ref = 1;
3028 dot_symbol.sy_value.X_op = O_constant;
3033 /* Maximum indent level.
3034 Available for modification inside a gdb session. */
3035 static int max_indent_level = 8;
3038 print_symbol_value_1 (FILE *file, symbolS *sym)
3040 const char *name = S_GET_NAME (sym);
3041 if (!name || !name[0])
3043 fprintf (file, "sym ");
3044 fprintf_vma (file, (bfd_vma) ((bfd_hostptr_t) sym));
3045 fprintf (file, " %s", name);
3047 if (LOCAL_SYMBOL_CHECK (sym))
3049 struct local_symbol *locsym = (struct local_symbol *) sym;
3051 if (local_symbol_get_frag (locsym) != & zero_address_frag
3052 && local_symbol_get_frag (locsym) != NULL)
3054 fprintf (file, " frag ");
3055 fprintf_vma (file, (bfd_vma) ((bfd_hostptr_t) local_symbol_get_frag (locsym)));
3057 if (local_symbol_resolved_p (locsym))
3058 fprintf (file, " resolved");
3059 fprintf (file, " local");
3063 if (sym->sy_frag != &zero_address_frag)
3065 fprintf (file, " frag ");
3066 fprintf_vma (file, (bfd_vma) ((bfd_hostptr_t) sym->sy_frag));
3068 if (sym->sy_flags.sy_written)
3069 fprintf (file, " written");
3070 if (sym->sy_flags.sy_resolved)
3071 fprintf (file, " resolved");
3072 else if (sym->sy_flags.sy_resolving)
3073 fprintf (file, " resolving");
3074 if (sym->sy_flags.sy_used_in_reloc)
3075 fprintf (file, " used-in-reloc");
3076 if (sym->sy_flags.sy_used)
3077 fprintf (file, " used");
3078 if (S_IS_LOCAL (sym))
3079 fprintf (file, " local");
3080 if (S_IS_EXTERNAL (sym))
3081 fprintf (file, " extern");
3082 if (S_IS_WEAK (sym))
3083 fprintf (file, " weak");
3084 if (S_IS_DEBUG (sym))
3085 fprintf (file, " debug");
3086 if (S_IS_DEFINED (sym))
3087 fprintf (file, " defined");
3089 if (S_IS_WEAKREFR (sym))
3090 fprintf (file, " weakrefr");
3091 if (S_IS_WEAKREFD (sym))
3092 fprintf (file, " weakrefd");
3093 fprintf (file, " %s", segment_name (S_GET_SEGMENT (sym)));
3094 if (symbol_resolved_p (sym))
3096 segT s = S_GET_SEGMENT (sym);
3098 if (s != undefined_section
3099 && s != expr_section)
3100 fprintf (file, " %lx", (unsigned long) S_GET_VALUE (sym));
3102 else if (indent_level < max_indent_level
3103 && S_GET_SEGMENT (sym) != undefined_section)
3106 fprintf (file, "\n%*s<", indent_level * 4, "");
3107 if (LOCAL_SYMBOL_CHECK (sym))
3108 fprintf (file, "constant %lx",
3109 (unsigned long) ((struct local_symbol *) sym)->lsy_value);
3111 print_expr_1 (file, &sym->sy_value);
3112 fprintf (file, ">");
3119 print_symbol_value (symbolS *sym)
3122 print_symbol_value_1 (stderr, sym);
3123 fprintf (stderr, "\n");
3127 print_binary (FILE *file, const char *name, expressionS *exp)
3130 fprintf (file, "%s\n%*s<", name, indent_level * 4, "");
3131 print_symbol_value_1 (file, exp->X_add_symbol);
3132 fprintf (file, ">\n%*s<", indent_level * 4, "");
3133 print_symbol_value_1 (file, exp->X_op_symbol);
3134 fprintf (file, ">");
3139 print_expr_1 (FILE *file, expressionS *exp)
3141 fprintf (file, "expr ");
3142 fprintf_vma (file, (bfd_vma) ((bfd_hostptr_t) exp));
3143 fprintf (file, " ");
3147 fprintf (file, "illegal");
3150 fprintf (file, "absent");
3153 fprintf (file, "constant %lx", (unsigned long) exp->X_add_number);
3157 fprintf (file, "symbol\n%*s<", indent_level * 4, "");
3158 print_symbol_value_1 (file, exp->X_add_symbol);
3159 fprintf (file, ">");
3161 if (exp->X_add_number)
3162 fprintf (file, "\n%*s%lx", indent_level * 4, "",
3163 (unsigned long) exp->X_add_number);
3167 fprintf (file, "register #%d", (int) exp->X_add_number);
3170 fprintf (file, "big");
3173 fprintf (file, "uminus -<");
3175 print_symbol_value_1 (file, exp->X_add_symbol);
3176 fprintf (file, ">");
3177 goto maybe_print_addnum;
3179 fprintf (file, "bit_not");
3182 print_binary (file, "multiply", exp);
3185 print_binary (file, "divide", exp);
3188 print_binary (file, "modulus", exp);
3191 print_binary (file, "lshift", exp);
3194 print_binary (file, "rshift", exp);
3196 case O_bit_inclusive_or:
3197 print_binary (file, "bit_ior", exp);
3199 case O_bit_exclusive_or:
3200 print_binary (file, "bit_xor", exp);
3203 print_binary (file, "bit_and", exp);
3206 print_binary (file, "eq", exp);
3209 print_binary (file, "ne", exp);
3212 print_binary (file, "lt", exp);
3215 print_binary (file, "le", exp);
3218 print_binary (file, "ge", exp);
3221 print_binary (file, "gt", exp);
3224 print_binary (file, "logical_and", exp);
3227 print_binary (file, "logical_or", exp);
3231 fprintf (file, "add\n%*s<", indent_level * 4, "");
3232 print_symbol_value_1 (file, exp->X_add_symbol);
3233 fprintf (file, ">\n%*s<", indent_level * 4, "");
3234 print_symbol_value_1 (file, exp->X_op_symbol);
3235 fprintf (file, ">");
3236 goto maybe_print_addnum;
3239 fprintf (file, "subtract\n%*s<", indent_level * 4, "");
3240 print_symbol_value_1 (file, exp->X_add_symbol);
3241 fprintf (file, ">\n%*s<", indent_level * 4, "");
3242 print_symbol_value_1 (file, exp->X_op_symbol);
3243 fprintf (file, ">");
3244 goto maybe_print_addnum;
3246 fprintf (file, "{unknown opcode %d}", (int) exp->X_op);
3253 print_expr (expressionS *exp)
3255 print_expr_1 (stderr, exp);
3256 fprintf (stderr, "\n");
3260 symbol_print_statistics (FILE *file)
3262 hash_print_statistics (file, "symbol table", sy_hash);
3263 hash_print_statistics (file, "mini local symbol table", local_hash);
3264 fprintf (file, "%lu mini local symbols created, %lu converted\n",
3265 local_symbol_count, local_symbol_conversion_count);
3268 #ifdef OBJ_COMPLEX_RELC
3270 /* Convert given symbol to a new complex-relocation symbol name. This
3271 may be a recursive function, since it might be called for non-leaf
3272 nodes (plain symbols) in the expression tree. The caller owns the
3273 returning string, so should free it eventually. Errors are
3274 indicated via as_bad and a NULL return value. The given symbol
3275 is marked with sy_used_in_reloc. */
3278 symbol_relc_make_sym (symbolS * sym)
3280 char * terminal = NULL;
3285 gas_assert (sym != NULL);
3287 /* Recurse to symbol_relc_make_expr if this symbol
3288 is defined as an expression or a plain value. */
3289 if ( S_GET_SEGMENT (sym) == expr_section
3290 || S_GET_SEGMENT (sym) == absolute_section)
3291 return symbol_relc_make_expr (symbol_get_value_expression (sym));
3293 /* This may be a "fake symbol", referring to ".".
3294 Write out a special null symbol to refer to this position. */
3295 if (! strcmp (S_GET_NAME (sym), FAKE_LABEL_NAME))
3296 return xstrdup (".");
3298 /* We hope this is a plain leaf symbol. Construct the encoding
3299 as {S,s}II...:CCCCCCC....
3300 where 'S'/'s' means section symbol / plain symbol
3301 III is decimal for the symbol name length
3302 CCC is the symbol name itself. */
3303 symbol_mark_used_in_reloc (sym);
3305 sname = S_GET_NAME (sym);
3306 sname_len = strlen (sname);
3307 typetag = symbol_section_p (sym) ? 'S' : 's';
3309 terminal = XNEWVEC (char, (1 /* S or s */
3310 + 8 /* sname_len in decimal */
3312 + sname_len /* name itself */
3315 sprintf (terminal, "%c%d:%s", typetag, sname_len, sname);
3319 /* Convert given value to a new complex-relocation symbol name. This
3320 is a non-recursive function, since it is be called for leaf nodes
3321 (plain values) in the expression tree. The caller owns the
3322 returning string, so should free() it eventually. No errors. */
3325 symbol_relc_make_value (offsetT val)
3327 char * terminal = XNEWVEC (char, 28); /* Enough for long long. */
3330 bfd_sprintf_vma (stdoutput, terminal + 1, val);
3334 /* Convert given expression to a new complex-relocation symbol name.
3335 This is a recursive function, since it traverses the entire given
3336 expression tree. The caller owns the returning string, so should
3337 free() it eventually. Errors are indicated via as_bad() and a NULL
3341 symbol_relc_make_expr (expressionS * exp)
3343 const char * opstr = NULL; /* Operator prefix string. */
3344 int arity = 0; /* Arity of this operator. */
3345 char * operands[3]; /* Up to three operands. */
3346 char * concat_string = NULL;
3348 operands[0] = operands[1] = operands[2] = NULL;
3350 gas_assert (exp != NULL);
3352 /* Match known operators -> fill in opstr, arity, operands[] and fall
3353 through to construct subexpression fragments; may instead return
3354 string directly for leaf nodes. */
3356 /* See expr.h for the meaning of all these enums. Many operators
3357 have an unnatural arity (X_add_number implicitly added). The
3358 conversion logic expands them to explicit "+" subexpressions. */
3363 as_bad ("Unknown expression operator (enum %d)", exp->X_op);
3368 return symbol_relc_make_value (exp->X_add_number);
3371 if (exp->X_add_number)
3375 operands[0] = symbol_relc_make_sym (exp->X_add_symbol);
3376 operands[1] = symbol_relc_make_value (exp->X_add_number);
3380 return symbol_relc_make_sym (exp->X_add_symbol);
3382 /* Helper macros for nesting nodes. */
3384 #define HANDLE_XADD_OPT1(str_) \
3385 if (exp->X_add_number) \
3388 opstr = "+:" str_; \
3389 operands[0] = symbol_relc_make_sym (exp->X_add_symbol); \
3390 operands[1] = symbol_relc_make_value (exp->X_add_number); \
3397 operands[0] = symbol_relc_make_sym (exp->X_add_symbol); \
3401 #define HANDLE_XADD_OPT2(str_) \
3402 if (exp->X_add_number) \
3405 opstr = "+:" str_; \
3406 operands[0] = symbol_relc_make_sym (exp->X_add_symbol); \
3407 operands[1] = symbol_relc_make_sym (exp->X_op_symbol); \
3408 operands[2] = symbol_relc_make_value (exp->X_add_number); \
3414 operands[0] = symbol_relc_make_sym (exp->X_add_symbol); \
3415 operands[1] = symbol_relc_make_sym (exp->X_op_symbol); \
3419 /* Nesting nodes. */
3421 case O_uminus: HANDLE_XADD_OPT1 ("0-");
3422 case O_bit_not: HANDLE_XADD_OPT1 ("~");
3423 case O_logical_not: HANDLE_XADD_OPT1 ("!");
3424 case O_multiply: HANDLE_XADD_OPT2 ("*");
3425 case O_divide: HANDLE_XADD_OPT2 ("/");
3426 case O_modulus: HANDLE_XADD_OPT2 ("%");
3427 case O_left_shift: HANDLE_XADD_OPT2 ("<<");
3428 case O_right_shift: HANDLE_XADD_OPT2 (">>");
3429 case O_bit_inclusive_or: HANDLE_XADD_OPT2 ("|");
3430 case O_bit_exclusive_or: HANDLE_XADD_OPT2 ("^");
3431 case O_bit_and: HANDLE_XADD_OPT2 ("&");
3432 case O_add: HANDLE_XADD_OPT2 ("+");
3433 case O_subtract: HANDLE_XADD_OPT2 ("-");
3434 case O_eq: HANDLE_XADD_OPT2 ("==");
3435 case O_ne: HANDLE_XADD_OPT2 ("!=");
3436 case O_lt: HANDLE_XADD_OPT2 ("<");
3437 case O_le: HANDLE_XADD_OPT2 ("<=");
3438 case O_ge: HANDLE_XADD_OPT2 (">=");
3439 case O_gt: HANDLE_XADD_OPT2 (">");
3440 case O_logical_and: HANDLE_XADD_OPT2 ("&&");
3441 case O_logical_or: HANDLE_XADD_OPT2 ("||");
3444 /* Validate & reject early. */
3445 if (arity >= 1 && ((operands[0] == NULL) || (strlen (operands[0]) == 0)))
3447 if (arity >= 2 && ((operands[1] == NULL) || (strlen (operands[1]) == 0)))
3449 if (arity >= 3 && ((operands[2] == NULL) || (strlen (operands[2]) == 0)))
3453 concat_string = NULL;
3454 else if (arity == 0)
3455 concat_string = xstrdup (opstr);
3456 else if (arity == 1)
3457 concat_string = concat (opstr, ":", operands[0], (char *) NULL);
3458 else if (arity == 2)
3459 concat_string = concat (opstr, ":", operands[0], ":", operands[1],
3462 concat_string = concat (opstr, ":", operands[0], ":", operands[1], ":",
3463 operands[2], (char *) NULL);
3465 /* Free operand strings (not opstr). */
3466 if (arity >= 1) xfree (operands[0]);
3467 if (arity >= 2) xfree (operands[1]);
3468 if (arity >= 3) xfree (operands[2]);
3470 return concat_string;