604633aeca
Wrote non-BFD_ASSEMBLER subseg_new. Now subseg_new always takes a section name, and subseg_set always takes a segT. Changed all callers as appropriate. * config/obj-coffbfd.c (change_to_section): Renamed to obj_coff_add_segment. Corrected. Made callers use subseg_new. * config/obj-coffbfd.h (obj_segment_name, obj_add_segment): Define. Also some more gcc warning removal.
1223 lines
30 KiB
C
1223 lines
30 KiB
C
/* symbols.c -symbol table-
|
||
Copyright (C) 1987, 1990, 1991, 1992, 1993 Free Software Foundation, Inc.
|
||
|
||
This file is part of GAS, the GNU Assembler.
|
||
|
||
GAS is free software; you can redistribute it and/or modify
|
||
it under the terms of the GNU General Public License as published by
|
||
the Free Software Foundation; either version 2, or (at your option)
|
||
any later version.
|
||
|
||
GAS is distributed in the hope that it will be useful,
|
||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
GNU General Public License for more details.
|
||
|
||
You should have received a copy of the GNU General Public License
|
||
along with GAS; see the file COPYING. If not, write to
|
||
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
|
||
|
||
/* #define DEBUG_SYMS / * to debug symbol list maintenance */
|
||
|
||
#include <ctype.h>
|
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|
||
#include "as.h"
|
||
|
||
#include "obstack.h" /* For "symbols.h" */
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#include "subsegs.h"
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|
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#ifndef WORKING_DOT_WORD
|
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extern int new_broken_words;
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||
#endif
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|
||
/* symbol-name => struct symbol pointer */
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||
static struct hash_control *sy_hash;
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||
/* Below are commented in "symbols.h". */
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symbolS *symbol_rootP;
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||
symbolS *symbol_lastP;
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symbolS abs_symbol;
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|
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symbolS *dot_text_symbol;
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||
symbolS *dot_data_symbol;
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symbolS *dot_bss_symbol;
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struct obstack notes;
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static void fb_label_init PARAMS ((void));
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void
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symbol_begin ()
|
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{
|
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symbol_lastP = NULL;
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symbol_rootP = NULL; /* In case we have 0 symbols (!!) */
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sy_hash = hash_new ();
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memset ((char *) (&abs_symbol), '\0', sizeof (abs_symbol));
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#ifdef BFD_ASSEMBLER
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abs_symbol.bsym = bfd_abs_section.symbol;
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#else
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/* Can't initialise a union. Sigh. */
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S_SET_SEGMENT (&abs_symbol, absolute_section);
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#endif
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#ifdef LOCAL_LABELS_FB
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fb_label_init ();
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#endif /* LOCAL_LABELS_FB */
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}
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|
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/*
|
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* symbol_new()
|
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*
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* Return a pointer to a new symbol.
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* Die if we can't make a new symbol.
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* Fill in the symbol's values.
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* Add symbol to end of symbol chain.
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*
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*
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* Please always call this to create a new symbol.
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*
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* Changes since 1985: Symbol names may not contain '\0'. Sigh.
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* 2nd argument is now a SEG rather than a TYPE. The mapping between
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* segments and types is mostly encapsulated herein (actually, we inherit it
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* from macros in struc-symbol.h).
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*/
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symbolS *
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symbol_new (name, segment, valu, frag)
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CONST char *name; /* It is copied, the caller can destroy/modify */
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segT segment; /* Segment identifier (SEG_<something>) */
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valueT valu; /* Symbol value */
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fragS *frag; /* Associated fragment */
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{
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unsigned int name_length;
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char *preserved_copy_of_name;
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symbolS *symbolP;
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name_length = strlen (name) + 1; /* +1 for \0 */
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obstack_grow (¬es, name, name_length);
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preserved_copy_of_name = obstack_finish (¬es);
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#ifdef STRIP_UNDERSCORE
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if (preserved_copy_of_name[0] == '_')
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preserved_copy_of_name++;
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#endif
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symbolP = (symbolS *) obstack_alloc (¬es, sizeof (symbolS));
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|
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/* symbol must be born in some fixed state. This seems as good as any. */
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memset (symbolP, 0, sizeof (symbolS));
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#ifdef BFD_ASSEMBLER
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symbolP->bsym = bfd_make_empty_symbol (stdoutput);
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assert (symbolP->bsym != 0);
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symbolP->bsym->udata = (PTR) symbolP;
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#endif
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S_SET_NAME (symbolP, preserved_copy_of_name);
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S_SET_SEGMENT (symbolP, segment);
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S_SET_VALUE (symbolP, valu);
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symbol_clear_list_pointers(symbolP);
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symbolP->sy_frag = frag;
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#ifndef BFD_ASSEMBLER
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symbolP->sy_number = ~0;
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symbolP->sy_name_offset = ~0;
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#endif
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/*
|
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* Link to end of symbol chain.
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*/
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symbol_append (symbolP, symbol_lastP, &symbol_rootP, &symbol_lastP);
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obj_symbol_new_hook (symbolP);
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#ifdef DEBUG_SYMS
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verify_symbol_chain(symbol_rootP, symbol_lastP);
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#endif /* DEBUG_SYMS */
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return symbolP;
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}
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/*
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* colon()
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*
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* We have just seen "<name>:".
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* Creates a struct symbol unless it already exists.
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*
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* Gripes if we are redefining a symbol incompatibly (and ignores it).
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*
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*/
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void
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colon (sym_name) /* just seen "x:" - rattle symbols & frags */
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register char *sym_name; /* symbol name, as a cannonical string */
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/* We copy this string: OK to alter later. */
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{
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register symbolS *symbolP; /* symbol we are working with */
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#ifdef LOCAL_LABELS_DOLLAR
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/* Sun local labels go out of scope whenever a non-local symbol is
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defined. */
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if (*sym_name != 'L')
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dollar_label_clear ();
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#endif /* LOCAL_LABELS_DOLLAR */
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#ifndef WORKING_DOT_WORD
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if (new_broken_words)
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{
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struct broken_word *a;
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int possible_bytes;
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fragS *frag_tmp;
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char *frag_opcode;
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extern const int md_short_jump_size;
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extern const int md_long_jump_size;
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possible_bytes = (md_short_jump_size
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+ new_broken_words * md_long_jump_size);
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frag_tmp = frag_now;
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frag_opcode = frag_var (rs_broken_word,
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possible_bytes,
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possible_bytes,
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(relax_substateT) 0,
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(symbolS *) broken_words,
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0L,
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NULL);
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/* We want to store the pointer to where to insert the jump table in the
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fr_opcode of the rs_broken_word frag. This requires a little
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hackery. */
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while (frag_tmp
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&& (frag_tmp->fr_type != rs_broken_word
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|| frag_tmp->fr_opcode))
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frag_tmp = frag_tmp->fr_next;
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know (frag_tmp);
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frag_tmp->fr_opcode = frag_opcode;
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new_broken_words = 0;
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for (a = broken_words; a && a->dispfrag == 0; a = a->next_broken_word)
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a->dispfrag = frag_tmp;
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}
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#endif /* WORKING_DOT_WORD */
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if ((symbolP = symbol_find (sym_name)) != 0)
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{
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#ifdef RESOLVE_SYMBOL_REDEFINITION
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if (RESOLVE_SYMBOL_REDEFINITION (symbolP))
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return;
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#endif
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/*
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* Now check for undefined symbols
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*/
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if (!S_IS_DEFINED (symbolP))
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{
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if (S_GET_VALUE (symbolP) == 0)
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{
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symbolP->sy_frag = frag_now;
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#ifdef OBJ_VMS
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S_GET_OTHER(symbolP) = const_flag;
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#endif
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S_SET_VALUE (symbolP, (valueT) ((char*)obstack_next_free (&frags) - frag_now->fr_literal));
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S_SET_SEGMENT (symbolP, now_seg);
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#ifdef N_UNDF
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know (N_UNDF == 0);
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#endif /* if we have one, it better be zero. */
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}
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else
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{
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/*
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* There are still several cases to check:
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* A .comm/.lcomm symbol being redefined as
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* initialized data is OK
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* A .comm/.lcomm symbol being redefined with
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* a larger size is also OK
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*
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* This only used to be allowed on VMS gas, but Sun cc
|
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* on the sparc also depends on it.
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*/
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if (((!S_IS_DEBUG (symbolP)
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&& !S_IS_DEFINED (symbolP)
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&& S_IS_EXTERNAL (symbolP))
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|| S_GET_SEGMENT (symbolP) == bss_section)
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&& (now_seg == data_section
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|| now_seg == S_GET_SEGMENT (symbolP)))
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{
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/*
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* Select which of the 2 cases this is
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*/
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if (now_seg != data_section)
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{
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/*
|
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* New .comm for prev .comm symbol.
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* If the new size is larger we just
|
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* change its value. If the new size
|
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* is smaller, we ignore this symbol
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*/
|
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if (S_GET_VALUE (symbolP)
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< ((unsigned) frag_now_fix ()))
|
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{
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S_SET_VALUE (symbolP, (valueT) frag_now_fix ());
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}
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||
}
|
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else
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{
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/* It is a .comm/.lcomm being converted to initialized
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data. */
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symbolP->sy_frag = frag_now;
|
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#ifdef OBJ_VMS
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S_GET_OTHER(symbolP) = const_flag;
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#endif /* OBJ_VMS */
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S_SET_VALUE (symbolP, (valueT) frag_now_fix ());
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S_SET_SEGMENT (symbolP, now_seg); /* keep N_EXT bit */
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}
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}
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else
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{
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#if defined (S_GET_OTHER) && defined (S_GET_DESC)
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as_fatal ("Symbol \"%s\" is already defined as \"%s\"/%d.%d.%ld.",
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sym_name,
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segment_name (S_GET_SEGMENT (symbolP)),
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S_GET_OTHER (symbolP), S_GET_DESC (symbolP),
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(long) S_GET_VALUE (symbolP));
|
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#else
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as_fatal ("Symbol \"%s\" is already defined as \"%s\"/%ld.",
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sym_name,
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segment_name (S_GET_SEGMENT (symbolP)),
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(long) S_GET_VALUE (symbolP));
|
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#endif
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}
|
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} /* if the undefined symbol has no value */
|
||
}
|
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else
|
||
{
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||
/* Don't blow up if the definition is the same */
|
||
if (!(frag_now == symbolP->sy_frag
|
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&& S_GET_VALUE (symbolP) == (char*)obstack_next_free (&frags) - frag_now->fr_literal
|
||
&& S_GET_SEGMENT (symbolP) == now_seg))
|
||
as_fatal ("Symbol %s already defined.", sym_name);
|
||
} /* if this symbol is not yet defined */
|
||
|
||
}
|
||
else
|
||
{
|
||
symbolP = symbol_new (sym_name,
|
||
now_seg,
|
||
(valueT) ((char*)obstack_next_free (&frags) - frag_now->fr_literal),
|
||
frag_now);
|
||
#ifdef OBJ_VMS
|
||
S_SET_OTHER (symbolP, const_flag);
|
||
#endif /* OBJ_VMS */
|
||
|
||
symbol_table_insert (symbolP);
|
||
} /* if we have seen this symbol before */
|
||
|
||
#ifdef tc_frob_label
|
||
tc_frob_label (symbolP);
|
||
#endif
|
||
}
|
||
|
||
|
||
/*
|
||
* symbol_table_insert()
|
||
*
|
||
* Die if we can't insert the symbol.
|
||
*
|
||
*/
|
||
|
||
void
|
||
symbol_table_insert (symbolP)
|
||
symbolS *symbolP;
|
||
{
|
||
register const char *error_string;
|
||
|
||
know (symbolP);
|
||
know (S_GET_NAME (symbolP));
|
||
|
||
if (*(error_string = hash_jam (sy_hash, S_GET_NAME (symbolP), (PTR) symbolP)))
|
||
{
|
||
as_fatal ("Inserting \"%s\" into symbol table failed: %s",
|
||
S_GET_NAME (symbolP), error_string);
|
||
} /* on error */
|
||
} /* symbol_table_insert() */
|
||
|
||
/*
|
||
* symbol_find_or_make()
|
||
*
|
||
* If a symbol name does not exist, create it as undefined, and insert
|
||
* it into the symbol table. Return a pointer to it.
|
||
*/
|
||
symbolS *
|
||
symbol_find_or_make (name)
|
||
char *name;
|
||
{
|
||
register symbolS *symbolP;
|
||
|
||
symbolP = symbol_find (name);
|
||
|
||
if (symbolP == NULL)
|
||
{
|
||
symbolP = symbol_make (name);
|
||
|
||
symbol_table_insert (symbolP);
|
||
} /* if symbol wasn't found */
|
||
|
||
return (symbolP);
|
||
} /* symbol_find_or_make() */
|
||
|
||
symbolS *
|
||
symbol_make (name)
|
||
CONST char *name;
|
||
{
|
||
symbolS *symbolP;
|
||
|
||
/* Let the machine description default it, e.g. for register names. */
|
||
symbolP = md_undefined_symbol ((char *) name);
|
||
|
||
if (!symbolP)
|
||
symbolP = symbol_new (name, undefined_section, (valueT) 0, &zero_address_frag);
|
||
|
||
return (symbolP);
|
||
} /* symbol_make() */
|
||
|
||
/*
|
||
* symbol_find()
|
||
*
|
||
* Implement symbol table lookup.
|
||
* In: A symbol's name as a string: '\0' can't be part of a symbol name.
|
||
* Out: NULL if the name was not in the symbol table, else the address
|
||
* of a struct symbol associated with that name.
|
||
*/
|
||
|
||
symbolS *
|
||
symbol_find (name)
|
||
CONST char *name;
|
||
{
|
||
#ifdef STRIP_UNDERSCORE
|
||
return (symbol_find_base (name, 1));
|
||
#else /* STRIP_UNDERSCORE */
|
||
return (symbol_find_base (name, 0));
|
||
#endif /* STRIP_UNDERSCORE */
|
||
} /* symbol_find() */
|
||
|
||
symbolS *
|
||
symbol_find_base (name, strip_underscore)
|
||
CONST char *name;
|
||
int strip_underscore;
|
||
{
|
||
if (strip_underscore && *name == '_')
|
||
name++;
|
||
return ((symbolS *) hash_find (sy_hash, name));
|
||
}
|
||
|
||
/*
|
||
* Once upon a time, symbols were kept in a singly linked list. At
|
||
* least coff needs to be able to rearrange them from time to time, for
|
||
* which a doubly linked list is much more convenient. Loic did these
|
||
* as macros which seemed dangerous to me so they're now functions.
|
||
* xoxorich.
|
||
*/
|
||
|
||
/* Link symbol ADDME after symbol TARGET in the chain. */
|
||
void
|
||
symbol_append (addme, target, rootPP, lastPP)
|
||
symbolS *addme;
|
||
symbolS *target;
|
||
symbolS **rootPP;
|
||
symbolS **lastPP;
|
||
{
|
||
if (target == NULL)
|
||
{
|
||
know (*rootPP == NULL);
|
||
know (*lastPP == NULL);
|
||
*rootPP = addme;
|
||
*lastPP = addme;
|
||
return;
|
||
} /* if the list is empty */
|
||
|
||
if (target->sy_next != NULL)
|
||
{
|
||
#ifdef SYMBOLS_NEED_BACKPOINTERS
|
||
target->sy_next->sy_previous = addme;
|
||
#endif /* SYMBOLS_NEED_BACKPOINTERS */
|
||
}
|
||
else
|
||
{
|
||
know (*lastPP == target);
|
||
*lastPP = addme;
|
||
} /* if we have a next */
|
||
|
||
addme->sy_next = target->sy_next;
|
||
target->sy_next = addme;
|
||
|
||
#ifdef SYMBOLS_NEED_BACKPOINTERS
|
||
addme->sy_previous = target;
|
||
#endif /* SYMBOLS_NEED_BACKPOINTERS */
|
||
}
|
||
|
||
#ifdef SYMBOLS_NEED_BACKPOINTERS
|
||
/* Remove SYMBOLP from the list. */
|
||
void
|
||
symbol_remove (symbolP, rootPP, lastPP)
|
||
symbolS *symbolP;
|
||
symbolS **rootPP;
|
||
symbolS **lastPP;
|
||
{
|
||
if (symbolP == *rootPP)
|
||
{
|
||
*rootPP = symbolP->sy_next;
|
||
} /* if it was the root */
|
||
|
||
if (symbolP == *lastPP)
|
||
{
|
||
*lastPP = symbolP->sy_previous;
|
||
} /* if it was the tail */
|
||
|
||
if (symbolP->sy_next != NULL)
|
||
{
|
||
symbolP->sy_next->sy_previous = symbolP->sy_previous;
|
||
} /* if not last */
|
||
|
||
if (symbolP->sy_previous != NULL)
|
||
{
|
||
symbolP->sy_previous->sy_next = symbolP->sy_next;
|
||
} /* if not first */
|
||
|
||
#ifdef DEBUG_SYMS
|
||
verify_symbol_chain (*rootPP, *lastPP);
|
||
#endif /* DEBUG_SYMS */
|
||
}
|
||
|
||
/* Set the chain pointers of SYMBOL to null. */
|
||
void
|
||
symbol_clear_list_pointers (symbolP)
|
||
symbolS *symbolP;
|
||
{
|
||
symbolP->sy_next = NULL;
|
||
symbolP->sy_previous = NULL;
|
||
}
|
||
|
||
/* Link symbol ADDME before symbol TARGET in the chain. */
|
||
void
|
||
symbol_insert (addme, target, rootPP, lastPP)
|
||
symbolS *addme;
|
||
symbolS *target;
|
||
symbolS **rootPP;
|
||
symbolS **lastPP;
|
||
{
|
||
if (target->sy_previous != NULL)
|
||
{
|
||
target->sy_previous->sy_next = addme;
|
||
}
|
||
else
|
||
{
|
||
know (*rootPP == target);
|
||
*rootPP = addme;
|
||
} /* if not first */
|
||
|
||
addme->sy_previous = target->sy_previous;
|
||
target->sy_previous = addme;
|
||
addme->sy_next = target;
|
||
|
||
#ifdef DEBUG_SYMS
|
||
verify_symbol_chain (*rootPP, *lastPP);
|
||
#endif /* DEBUG_SYMS */
|
||
}
|
||
|
||
#endif /* SYMBOLS_NEED_BACKPOINTERS */
|
||
|
||
void
|
||
verify_symbol_chain (rootP, lastP)
|
||
symbolS *rootP;
|
||
symbolS *lastP;
|
||
{
|
||
symbolS *symbolP = rootP;
|
||
|
||
if (symbolP == NULL)
|
||
return;
|
||
|
||
for (; symbol_next (symbolP) != NULL; symbolP = symbol_next (symbolP))
|
||
{
|
||
#ifdef SYMBOLS_NEED_BACKPOINTERS
|
||
know (symbolP->sy_next->sy_previous == symbolP);
|
||
#else
|
||
/* Walk the list anyways, to make sure pointers are still good. */
|
||
;
|
||
#endif /* SYMBOLS_NEED_BACKPOINTERS */
|
||
}
|
||
|
||
assert (lastP == symbolP);
|
||
}
|
||
|
||
void
|
||
verify_symbol_chain_2 (sym)
|
||
symbolS *sym;
|
||
{
|
||
symbolS *p = sym, *n = sym;
|
||
#ifdef SYMBOLS_NEED_BACKPOINTERS
|
||
while (symbol_previous (p))
|
||
p = symbol_previous (p);
|
||
#endif
|
||
while (symbol_next (n))
|
||
n = symbol_next (n);
|
||
verify_symbol_chain (p, n);
|
||
}
|
||
|
||
/* Resolve the value of a symbol. This is called during the final
|
||
pass over the symbol table to resolve any symbols with complex
|
||
values. */
|
||
|
||
void
|
||
resolve_symbol_value (symp)
|
||
symbolS *symp;
|
||
{
|
||
if (symp->sy_resolved)
|
||
return;
|
||
|
||
if (symp->sy_resolving)
|
||
{
|
||
as_bad ("Symbol definition loop encountered at %s",
|
||
S_GET_NAME (symp));
|
||
S_SET_VALUE (symp, (valueT) 0);
|
||
}
|
||
else
|
||
{
|
||
offsetT left, right, val;
|
||
segT seg_left, seg_right;
|
||
|
||
symp->sy_resolving = 1;
|
||
|
||
switch (symp->sy_value.X_op)
|
||
{
|
||
case O_absent:
|
||
S_SET_VALUE (symp, 0);
|
||
/* Fall through. */
|
||
case O_constant:
|
||
S_SET_VALUE (symp, S_GET_VALUE (symp) + symp->sy_frag->fr_address);
|
||
if (S_GET_SEGMENT (symp) == expr_section)
|
||
S_SET_SEGMENT (symp, absolute_section);
|
||
break;
|
||
|
||
case O_symbol:
|
||
resolve_symbol_value (symp->sy_value.X_add_symbol);
|
||
|
||
#ifdef obj_frob_forward_symbol
|
||
/* Some object formats need to forward the segment. */
|
||
obj_frob_forward_symbol (symp);
|
||
#endif
|
||
|
||
S_SET_VALUE (symp,
|
||
(symp->sy_value.X_add_number
|
||
+ symp->sy_frag->fr_address
|
||
+ S_GET_VALUE (symp->sy_value.X_add_symbol)));
|
||
if (S_GET_SEGMENT (symp) == expr_section
|
||
|| S_GET_SEGMENT (symp) == undefined_section)
|
||
S_SET_SEGMENT (symp,
|
||
S_GET_SEGMENT (symp->sy_value.X_add_symbol));
|
||
break;
|
||
|
||
case O_uminus:
|
||
case O_bit_not:
|
||
resolve_symbol_value (symp->sy_value.X_add_symbol);
|
||
if (symp->sy_value.X_op == O_uminus)
|
||
val = - S_GET_VALUE (symp->sy_value.X_add_symbol);
|
||
else
|
||
val = ~ S_GET_VALUE (symp->sy_value.X_add_symbol);
|
||
S_SET_VALUE (symp,
|
||
(val
|
||
+ symp->sy_value.X_add_number
|
||
+ symp->sy_frag->fr_address));
|
||
if (S_GET_SEGMENT (symp) == expr_section
|
||
|| S_GET_SEGMENT (symp) == undefined_section)
|
||
S_SET_SEGMENT (symp, absolute_section);
|
||
break;
|
||
|
||
case O_multiply:
|
||
case O_divide:
|
||
case O_modulus:
|
||
case O_left_shift:
|
||
case O_right_shift:
|
||
case O_bit_inclusive_or:
|
||
case O_bit_or_not:
|
||
case O_bit_exclusive_or:
|
||
case O_bit_and:
|
||
case O_add:
|
||
case O_subtract:
|
||
resolve_symbol_value (symp->sy_value.X_add_symbol);
|
||
resolve_symbol_value (symp->sy_value.X_op_symbol);
|
||
seg_left = S_GET_SEGMENT (symp->sy_value.X_add_symbol);
|
||
seg_right = S_GET_SEGMENT (symp->sy_value.X_op_symbol);
|
||
if (seg_left != seg_right
|
||
&& seg_left != undefined_section
|
||
&& seg_right != undefined_section)
|
||
as_bad ("%s is operation on symbols in different sections",
|
||
S_GET_NAME (symp));
|
||
if ((S_GET_SEGMENT (symp->sy_value.X_add_symbol)
|
||
!= absolute_section)
|
||
&& symp->sy_value.X_op != O_subtract)
|
||
as_bad ("%s is illegal operation on non-absolute symbols",
|
||
S_GET_NAME (symp));
|
||
left = S_GET_VALUE (symp->sy_value.X_add_symbol);
|
||
right = S_GET_VALUE (symp->sy_value.X_op_symbol);
|
||
switch (symp->sy_value.X_op)
|
||
{
|
||
case O_multiply: val = left * right; break;
|
||
case O_divide: val = left / right; break;
|
||
case O_modulus: val = left % right; break;
|
||
case O_left_shift: val = left << right; break;
|
||
case O_right_shift: val = left >> right; break;
|
||
case O_bit_inclusive_or: val = left | right; break;
|
||
case O_bit_or_not: val = left |~ right; break;
|
||
case O_bit_exclusive_or: val = left ^ right; break;
|
||
case O_bit_and: val = left & right; break;
|
||
case O_add: val = left + right; break;
|
||
case O_subtract: val = left - right; break;
|
||
default: abort ();
|
||
}
|
||
S_SET_VALUE (symp,
|
||
(symp->sy_value.X_add_number
|
||
+ symp->sy_frag->fr_address
|
||
+ val));
|
||
if (S_GET_SEGMENT (symp) == expr_section
|
||
|| S_GET_SEGMENT (symp) == undefined_section)
|
||
S_SET_SEGMENT (symp, absolute_section);
|
||
break;
|
||
|
||
case O_register:
|
||
case O_big:
|
||
case O_illegal:
|
||
as_bad ("bad value for symbol \"%s\"", S_GET_NAME (symp));
|
||
break;
|
||
}
|
||
}
|
||
|
||
symp->sy_resolved = 1;
|
||
}
|
||
|
||
#ifdef LOCAL_LABELS_DOLLAR
|
||
|
||
/* Dollar labels look like a number followed by a dollar sign. Eg, "42$".
|
||
They are *really* local. That is, they go out of scope whenever we see a
|
||
label that isn't local. Also, like fb labels, there can be multiple
|
||
instances of a dollar label. Therefor, we name encode each instance with
|
||
the instance number, keep a list of defined symbols separate from the real
|
||
symbol table, and we treat these buggers as a sparse array. */
|
||
|
||
static long *dollar_labels;
|
||
static long *dollar_label_instances;
|
||
static char *dollar_label_defines;
|
||
static long dollar_label_count;
|
||
static unsigned long dollar_label_max;
|
||
|
||
int
|
||
dollar_label_defined (label)
|
||
long label;
|
||
{
|
||
long *i;
|
||
|
||
know ((dollar_labels != NULL) || (dollar_label_count == 0));
|
||
|
||
for (i = dollar_labels; i < dollar_labels + dollar_label_count; ++i)
|
||
if (*i == label)
|
||
return dollar_label_defines[i - dollar_labels];
|
||
|
||
/* if we get here, label isn't defined */
|
||
return 0;
|
||
} /* dollar_label_defined() */
|
||
|
||
static int
|
||
dollar_label_instance (label)
|
||
long label;
|
||
{
|
||
long *i;
|
||
|
||
know ((dollar_labels != NULL) || (dollar_label_count == 0));
|
||
|
||
for (i = dollar_labels; i < dollar_labels + dollar_label_count; ++i)
|
||
if (*i == label)
|
||
return (dollar_label_instances[i - dollar_labels]);
|
||
|
||
/* If we get here, we haven't seen the label before, therefore its instance
|
||
count is zero. */
|
||
return 0;
|
||
}
|
||
|
||
void
|
||
dollar_label_clear ()
|
||
{
|
||
memset (dollar_label_defines, '\0', (unsigned int) dollar_label_count);
|
||
}
|
||
|
||
#define DOLLAR_LABEL_BUMP_BY 10
|
||
|
||
void
|
||
define_dollar_label (label)
|
||
long label;
|
||
{
|
||
long *i;
|
||
|
||
for (i = dollar_labels; i < dollar_labels + dollar_label_count; ++i)
|
||
if (*i == label)
|
||
{
|
||
++dollar_label_instances[i - dollar_labels];
|
||
dollar_label_defines[i - dollar_labels] = 1;
|
||
return;
|
||
}
|
||
|
||
/* if we get to here, we don't have label listed yet. */
|
||
|
||
if (dollar_labels == NULL)
|
||
{
|
||
dollar_labels = (long *) xmalloc (DOLLAR_LABEL_BUMP_BY * sizeof (long));
|
||
dollar_label_instances = (long *) xmalloc (DOLLAR_LABEL_BUMP_BY * sizeof (long));
|
||
dollar_label_defines = xmalloc (DOLLAR_LABEL_BUMP_BY);
|
||
dollar_label_max = DOLLAR_LABEL_BUMP_BY;
|
||
dollar_label_count = 0;
|
||
}
|
||
else if (dollar_label_count == dollar_label_max)
|
||
{
|
||
dollar_label_max += DOLLAR_LABEL_BUMP_BY;
|
||
dollar_labels = (long *) xrealloc ((char *) dollar_labels,
|
||
dollar_label_max * sizeof (long));
|
||
dollar_label_instances = (long *) xrealloc ((char *) dollar_label_instances,
|
||
dollar_label_max * sizeof (long));
|
||
dollar_label_defines = xrealloc (dollar_label_defines, dollar_label_max);
|
||
} /* if we needed to grow */
|
||
|
||
dollar_labels[dollar_label_count] = label;
|
||
dollar_label_instances[dollar_label_count] = 1;
|
||
dollar_label_defines[dollar_label_count] = 1;
|
||
++dollar_label_count;
|
||
}
|
||
|
||
/*
|
||
* dollar_label_name()
|
||
*
|
||
* Caller must copy returned name: we re-use the area for the next name.
|
||
*
|
||
* The mth occurence of label n: is turned into the symbol "Ln^Am"
|
||
* where n is the label number and m is the instance number. "L" makes
|
||
* it a label discarded unless debugging and "^A"('\1') ensures no
|
||
* ordinary symbol SHOULD get the same name as a local label
|
||
* symbol. The first "4:" is "L4^A1" - the m numbers begin at 1.
|
||
*
|
||
* fb labels get the same treatment, except that ^B is used in place of ^A.
|
||
*/
|
||
|
||
char * /* Return local label name. */
|
||
dollar_label_name (n, augend)
|
||
register long n; /* we just saw "n$:" : n a number */
|
||
register int augend; /* 0 for current instance, 1 for new instance */
|
||
{
|
||
long i;
|
||
/* Returned to caller, then copied. used for created names ("4f") */
|
||
static char symbol_name_build[24];
|
||
register char *p;
|
||
register char *q;
|
||
char symbol_name_temporary[20]; /* build up a number, BACKWARDS */
|
||
|
||
know (n >= 0);
|
||
know (augend == 0 || augend == 1);
|
||
p = symbol_name_build;
|
||
*p++ = 'L';
|
||
|
||
/* Next code just does sprintf( {}, "%d", n); */
|
||
/* label number */
|
||
q = symbol_name_temporary;
|
||
for (*q++ = 0, i = n; i; ++q)
|
||
{
|
||
*q = i % 10 + '0';
|
||
i /= 10;
|
||
}
|
||
while ((*p = *--q) != '\0')
|
||
++p;
|
||
|
||
*p++ = 1; /* ^A */
|
||
|
||
/* instance number */
|
||
q = symbol_name_temporary;
|
||
for (*q++ = 0, i = dollar_label_instance (n) + augend; i; ++q)
|
||
{
|
||
*q = i % 10 + '0';
|
||
i /= 10;
|
||
}
|
||
while ((*p++ = *--q) != '\0');;
|
||
|
||
/* The label, as a '\0' ended string, starts at symbol_name_build. */
|
||
return symbol_name_build;
|
||
}
|
||
|
||
#endif /* LOCAL_LABELS_DOLLAR */
|
||
|
||
#ifdef LOCAL_LABELS_FB
|
||
|
||
/*
|
||
* Sombody else's idea of local labels. They are made by "n:" where n
|
||
* is any decimal digit. Refer to them with
|
||
* "nb" for previous (backward) n:
|
||
* or "nf" for next (forward) n:.
|
||
*
|
||
* We do a little better and let n be any number, not just a single digit, but
|
||
* since the other guy's assembler only does ten, we treat the first ten
|
||
* specially.
|
||
*
|
||
* Like someone else's assembler, we have one set of local label counters for
|
||
* entire assembly, not one set per (sub)segment like in most assemblers. This
|
||
* implies that one can refer to a label in another segment, and indeed some
|
||
* crufty compilers have done just that.
|
||
*
|
||
* Since there could be a LOT of these things, treat them as a sparse array.
|
||
*/
|
||
|
||
#define FB_LABEL_SPECIAL (10)
|
||
|
||
static long fb_low_counter[FB_LABEL_SPECIAL];
|
||
static long *fb_labels;
|
||
static long *fb_label_instances;
|
||
static long fb_label_count = 0;
|
||
static long fb_label_max = 0;
|
||
|
||
/* this must be more than FB_LABEL_SPECIAL */
|
||
#define FB_LABEL_BUMP_BY (FB_LABEL_SPECIAL + 6)
|
||
|
||
static void
|
||
fb_label_init ()
|
||
{
|
||
memset ((void *) fb_low_counter, '\0', sizeof (fb_low_counter));
|
||
} /* fb_label_init() */
|
||
|
||
/* add one to the instance number of this fb label */
|
||
void
|
||
fb_label_instance_inc (label)
|
||
long label;
|
||
{
|
||
long *i;
|
||
|
||
if (label < FB_LABEL_SPECIAL)
|
||
{
|
||
++fb_low_counter[label];
|
||
return;
|
||
}
|
||
|
||
if (fb_labels != NULL)
|
||
{
|
||
for (i = fb_labels + FB_LABEL_SPECIAL;
|
||
i < fb_labels + fb_label_count; ++i)
|
||
{
|
||
if (*i == label)
|
||
{
|
||
++fb_label_instances[i - fb_labels];
|
||
return;
|
||
} /* if we find it */
|
||
} /* for each existing label */
|
||
}
|
||
|
||
/* if we get to here, we don't have label listed yet. */
|
||
|
||
if (fb_labels == NULL)
|
||
{
|
||
fb_labels = (long *) xmalloc (FB_LABEL_BUMP_BY * sizeof (long));
|
||
fb_label_instances = (long *) xmalloc (FB_LABEL_BUMP_BY * sizeof (long));
|
||
fb_label_max = FB_LABEL_BUMP_BY;
|
||
fb_label_count = FB_LABEL_SPECIAL;
|
||
|
||
}
|
||
else if (fb_label_count == fb_label_max)
|
||
{
|
||
fb_label_max += FB_LABEL_BUMP_BY;
|
||
fb_labels = (long *) xrealloc ((char *) fb_labels,
|
||
fb_label_max * sizeof (long));
|
||
fb_label_instances = (long *) xrealloc ((char *) fb_label_instances,
|
||
fb_label_max * sizeof (long));
|
||
} /* if we needed to grow */
|
||
|
||
fb_labels[fb_label_count] = label;
|
||
fb_label_instances[fb_label_count] = 1;
|
||
++fb_label_count;
|
||
}
|
||
|
||
static long
|
||
fb_label_instance (label)
|
||
long label;
|
||
{
|
||
long *i;
|
||
|
||
if (label < FB_LABEL_SPECIAL)
|
||
{
|
||
return (fb_low_counter[label]);
|
||
}
|
||
|
||
if (fb_labels != NULL)
|
||
{
|
||
for (i = fb_labels + FB_LABEL_SPECIAL;
|
||
i < fb_labels + fb_label_count; ++i)
|
||
{
|
||
if (*i == label)
|
||
{
|
||
return (fb_label_instances[i - fb_labels]);
|
||
} /* if we find it */
|
||
} /* for each existing label */
|
||
}
|
||
|
||
/* We didn't find the label, so this must be a reference to the
|
||
first instance. */
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
* fb_label_name()
|
||
*
|
||
* Caller must copy returned name: we re-use the area for the next name.
|
||
*
|
||
* The mth occurence of label n: is turned into the symbol "Ln^Bm"
|
||
* where n is the label number and m is the instance number. "L" makes
|
||
* it a label discarded unless debugging and "^B"('\2') ensures no
|
||
* ordinary symbol SHOULD get the same name as a local label
|
||
* symbol. The first "4:" is "L4^B1" - the m numbers begin at 1.
|
||
*
|
||
* dollar labels get the same treatment, except that ^A is used in place of ^B. */
|
||
|
||
char * /* Return local label name. */
|
||
fb_label_name (n, augend)
|
||
long n; /* we just saw "n:", "nf" or "nb" : n a number */
|
||
long augend; /* 0 for nb, 1 for n:, nf */
|
||
{
|
||
long i;
|
||
/* Returned to caller, then copied. used for created names ("4f") */
|
||
static char symbol_name_build[24];
|
||
register char *p;
|
||
register char *q;
|
||
char symbol_name_temporary[20]; /* build up a number, BACKWARDS */
|
||
|
||
know (n >= 0);
|
||
know (augend == 0 || augend == 1);
|
||
p = symbol_name_build;
|
||
*p++ = 'L';
|
||
|
||
/* Next code just does sprintf( {}, "%d", n); */
|
||
/* label number */
|
||
q = symbol_name_temporary;
|
||
for (*q++ = 0, i = n; i; ++q)
|
||
{
|
||
*q = i % 10 + '0';
|
||
i /= 10;
|
||
}
|
||
while ((*p = *--q) != '\0')
|
||
++p;
|
||
|
||
*p++ = 2; /* ^B */
|
||
|
||
/* instance number */
|
||
q = symbol_name_temporary;
|
||
for (*q++ = 0, i = fb_label_instance (n) + augend; i; ++q)
|
||
{
|
||
*q = i % 10 + '0';
|
||
i /= 10;
|
||
}
|
||
while ((*p++ = *--q) != '\0');;
|
||
|
||
/* The label, as a '\0' ended string, starts at symbol_name_build. */
|
||
return (symbol_name_build);
|
||
} /* fb_label_name() */
|
||
|
||
#endif /* LOCAL_LABELS_FB */
|
||
|
||
|
||
/*
|
||
* decode name that may have been generated by foo_label_name() above. If
|
||
* the name wasn't generated by foo_label_name(), then return it unaltered.
|
||
* This is used for error messages.
|
||
*/
|
||
|
||
char *
|
||
decode_local_label_name (s)
|
||
char *s;
|
||
{
|
||
char *p;
|
||
char *symbol_decode;
|
||
int label_number;
|
||
int instance_number;
|
||
char *type;
|
||
const char *message_format = "\"%d\" (instance number %d of a %s label)";
|
||
|
||
if (s[0] != 'L')
|
||
return (s);
|
||
|
||
for (label_number = 0, p = s + 1; isdigit (*p); ++p)
|
||
{
|
||
label_number = (10 * label_number) + *p - '0';
|
||
}
|
||
|
||
if (*p == 1)
|
||
{
|
||
type = "dollar";
|
||
}
|
||
else if (*p == 2)
|
||
{
|
||
type = "fb";
|
||
}
|
||
else
|
||
{
|
||
return (s);
|
||
}
|
||
|
||
for (instance_number = 0, p = s + 1; isdigit (*p); ++p)
|
||
{
|
||
instance_number = (10 * instance_number) + *p - '0';
|
||
}
|
||
|
||
symbol_decode = obstack_alloc (¬es, strlen (message_format) + 30);
|
||
(void) sprintf (symbol_decode, message_format, label_number,
|
||
instance_number, type);
|
||
|
||
return (symbol_decode);
|
||
} /* decode_local_label_name() */
|
||
|
||
/* Get the value of a symbol. */
|
||
|
||
valueT
|
||
S_GET_VALUE (s)
|
||
symbolS *s;
|
||
{
|
||
if (s->sy_value.X_op != O_constant)
|
||
as_bad ("Attempt to get value of unresolved symbol %s", S_GET_NAME (s));
|
||
return (valueT) s->sy_value.X_add_number;
|
||
}
|
||
|
||
/* Set the value of a symbol. */
|
||
|
||
void
|
||
S_SET_VALUE (s, val)
|
||
symbolS *s;
|
||
valueT val;
|
||
{
|
||
s->sy_value.X_op = O_constant;
|
||
s->sy_value.X_add_number = (offsetT) val;
|
||
}
|
||
|
||
#ifdef BFD_ASSEMBLER
|
||
|
||
int
|
||
S_IS_EXTERNAL (s)
|
||
symbolS *s;
|
||
{
|
||
flagword flags = s->bsym->flags;
|
||
|
||
/* sanity check */
|
||
if (flags & BSF_LOCAL && flags & (BSF_EXPORT | BSF_GLOBAL))
|
||
abort ();
|
||
|
||
return (flags & (BSF_EXPORT | BSF_GLOBAL)) != 0;
|
||
}
|
||
|
||
int
|
||
S_IS_COMMON (s)
|
||
symbolS *s;
|
||
{
|
||
return s->bsym->section == &bfd_com_section;
|
||
}
|
||
|
||
int
|
||
S_IS_DEFINED (s)
|
||
symbolS *s;
|
||
{
|
||
return s->bsym->section != undefined_section;
|
||
}
|
||
|
||
int
|
||
S_IS_DEBUG (s)
|
||
symbolS *s;
|
||
{
|
||
if (s->bsym->flags & BSF_DEBUGGING)
|
||
return 1;
|
||
return 0;
|
||
}
|
||
|
||
int
|
||
S_IS_LOCAL (s)
|
||
symbolS *s;
|
||
{
|
||
flagword flags = s->bsym->flags;
|
||
|
||
/* sanity check */
|
||
if (flags & BSF_LOCAL && flags & (BSF_EXPORT | BSF_GLOBAL))
|
||
abort ();
|
||
|
||
return (S_GET_NAME (s)
|
||
&& ! S_IS_DEBUG (s)
|
||
&& (strchr (S_GET_NAME (s), '\001')
|
||
|| strchr (S_GET_NAME (s), '\002')
|
||
|| (S_LOCAL_NAME (s)
|
||
&& !flagseen['L'])));
|
||
}
|
||
|
||
int
|
||
S_IS_EXTERN (s)
|
||
symbolS *s;
|
||
{
|
||
return S_IS_EXTERNAL (s);
|
||
}
|
||
|
||
int
|
||
S_IS_STABD (s)
|
||
symbolS *s;
|
||
{
|
||
return S_GET_NAME (s) == 0;
|
||
}
|
||
|
||
CONST char *
|
||
S_GET_NAME (s)
|
||
symbolS *s;
|
||
{
|
||
return s->bsym->name;
|
||
}
|
||
|
||
segT
|
||
S_GET_SEGMENT (s)
|
||
symbolS *s;
|
||
{
|
||
return s->bsym->section;
|
||
}
|
||
|
||
void
|
||
S_SET_SEGMENT (s, seg)
|
||
symbolS *s;
|
||
segT seg;
|
||
{
|
||
s->bsym->section = seg;
|
||
}
|
||
|
||
void
|
||
S_SET_EXTERNAL (s)
|
||
symbolS *s;
|
||
{
|
||
s->bsym->flags |= BSF_GLOBAL;
|
||
s->bsym->flags &= ~(BSF_LOCAL|BSF_WEAK);
|
||
}
|
||
|
||
void
|
||
S_CLEAR_EXTERNAL (s)
|
||
symbolS *s;
|
||
{
|
||
s->bsym->flags |= BSF_LOCAL;
|
||
s->bsym->flags &= ~(BSF_GLOBAL|BSF_WEAK);
|
||
}
|
||
|
||
void
|
||
S_SET_WEAK (s)
|
||
symbolS *s;
|
||
{
|
||
s->bsym->flags |= BSF_WEAK;
|
||
s->bsym->flags &= ~(BSF_GLOBAL|BSF_LOCAL);
|
||
}
|
||
|
||
void
|
||
S_SET_NAME (s, name)
|
||
symbolS *s;
|
||
char *name;
|
||
{
|
||
s->bsym->name = name;
|
||
}
|
||
#endif /* BFD_ASSEMBLER */
|
||
|
||
/* end of symbols.c */
|