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-rw-r--r--gnu/gas/symbols.c438
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diff --git a/gnu/gas/symbols.c b/gnu/gas/symbols.c
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index ce7197a8e06f6..0000000000000
--- a/gnu/gas/symbols.c
+++ /dev/null
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-/* symbols.c -symbol table-
- Copyright (C) 1987 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 1, 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. */
-
-
-#include "as.h"
-#include "hash.h"
-#include "obstack.h" /* For "symbols.h" */
-#include "struc-symbol.h"
-#include "symbols.h"
-#include "frags.h"
-
-#ifndef WORKING_DOT_WORD
-extern int new_broken_words;
-#endif
-#ifdef VMS
-extern char const_flag;
-#endif
-
-static
-struct hash_control *
-sy_hash; /* symbol-name => struct symbol pointer */
-
- /* Below are commented in "symbols.h". */
-unsigned int local_bss_counter;
-symbolS * symbol_rootP;
-symbolS * symbol_lastP;
-symbolS abs_symbol;
-struct obstack notes;
-
-
-
-symbolS * symbol_find(); /* Keep C compiler happy. */
-
-/*
- * Un*x 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:.
- *
- * Like Un*x AS, 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.
- *
- * I document the symbol names here to save duplicating words elsewhere.
- * The mth occurence of label n: is turned into the symbol "Ln^Am" where
- * n is a digit and m is a decimal 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.
- */
-
-typedef short unsigned int
-local_label_countT;
-
-static local_label_countT
-local_label_counter[10];
-
-static /* Returned to caller, then copied. */
- char symbol_name_build[12]; /* used for created names ("4f") */
-
-#ifdef SUN_ASM_SYNTAX
-int local_label_defined[10];
-#endif
-
-
-void
-symbol_begin()
-{
- symbol_lastP = NULL;
- symbol_rootP = NULL; /* In case we have 0 symbols (!!) */
- sy_hash = hash_new();
- bzero ((char *)(& abs_symbol), sizeof(abs_symbol));
- abs_symbol . sy_type = N_ABS; /* Can't initialise a union. Sigh. */
- bzero ((char *)(local_label_counter), sizeof(local_label_counter) );
- local_bss_counter = 0;
-}
-
-/*
- * local_label_name()
- *
- * Caller must copy returned name: we re-use the area for the next name.
- */
-
-char * /* Return local label name. */
-local_label_name(n, augend)
- register int n; /* we just saw "n:", "nf" or "nb" : n a digit */
- register int augend; /* 0 for nb, 1 for n:, nf */
-{
- register char * p;
- register char * q;
- char symbol_name_temporary[10]; /* build up a number, BACKWARDS */
-
- know( n >= 0 );
- know( augend == 0 || augend == 1 );
- p = symbol_name_build;
- * p ++ = 'L';
- * p ++ = n + '0'; /* Make into ASCII */
- * p ++ = 1; /* ^A */
- n = local_label_counter [ n ] + augend;
- /* version number of this local label */
- /*
- * Next code just does sprintf( {}, "%d", n);
- * It is more elegant to do the next part recursively, but a procedure
- * call for each digit emitted is considered too costly.
- */
- q = symbol_name_temporary;
- for (*q++=0; n; q++) /* emits NOTHING if n starts as 0 */
- {
- know(n>0); /* We expect n > 0 always */
- *q = n % 10 + '0';
- n /= 10;
- }
- while ( * p ++ = * -- q )
- {
- }
- /* The label, as a '\0' ended string, starts at symbol_name_build. */
- return (symbol_name_build);
-}
-
-
-void
-local_colon (n)
- int n; /* just saw "n:" */
-{
- local_label_counter [n] ++;
-#ifdef SUN_ASM_SYNTAX
- local_label_defined[n]=1;
-#endif
- colon (local_label_name (n, 0));
-}
-
-/*
- * symbol_new()
- *
- * Return a pointer to a new symbol.
- * Die if we can't make a new symbol.
- * Fill in the symbol's values.
- * Add symbol to end of symbol chain.
- *
- *
- * Please always call this to create a new symbol.
- *
- * Changes since 1985: Symbol names may not contain '\0'. Sigh.
- */
-
-symbolS *
-symbol_new (name, type, other, desc, value, frag)
- char * name; /* We copy this: OK to alter your copy. */
- unsigned char type; /* As in <a.out.h>. */
- char other; /* As in <a.out.h>. */
- short int desc; /* As in <a.out.h>. */
- valueT value; /* As in <a.out.h>, often an address. */
- /* Often used as offset from frag address. */
- struct frag * frag; /* For sy_frag. */
-{
- register symbolS * symbolP;
- register char * preserved_copy_of_name;
- register unsigned int name_length;
- char * p;
-
- name_length = strlen(name) + 1;
- obstack_grow(&notes,name,name_length);
- p=obstack_finish(&notes);
- /* obstack_1done( &notes, name, name_length, &p ); */
- preserved_copy_of_name = p;
- p=obstack_alloc(&notes,sizeof(struct symbol));
- /* obstack_1blank( &notes, sizeof(struct symbol), &p ); */
- symbolP = (symbolS *) p;
- symbolP -> sy_name = preserved_copy_of_name;
- symbolP -> sy_type = type;
- symbolP -> sy_other = other;
- symbolP -> sy_desc = desc;
- symbolP -> sy_value = value;
- symbolP -> sy_frag = frag;
- symbolP -> sy_next = NULL; /* End of chain. */
- symbolP -> sy_forward = NULL; /* JF */
-#ifdef SUSPECT
- symbolP -> sy_name_offset = ~ 0; /* Impossible offset catches errors. */
- symbolP -> sy_number = ~ 0; /* Ditto. */
-#endif
- /*
- * Link to end of symbol chain.
- */
- if (symbol_lastP)
- {
- symbol_lastP -> sy_next = symbolP;
- }
- else
- {
- symbol_rootP = symbolP;
- }
- symbol_lastP = symbolP;
-
- return (symbolP);
-}
-
-/*
- * colon()
- *
- * We have just seen "<name>:".
- * Creates a struct symbol unless it already exists.
- *
- * Gripes if we are redefining a symbol incompatibly (and ignores it).
- *
- */
-void
-colon (sym_name) /* just seen "x:" - rattle symbols & frags */
- register char * sym_name; /* symbol name, as a cannonical string */
- /* We copy this string: OK to alter later. */
-{
- register struct symbol * symbolP; /* symbol we are working with */
-
-#ifdef SUN_ASM_SYNTAX
- /* Sun local labes go out of scope whenever a non-local symbol is
- defined. */
-
- if(*sym_name !='L')
- bzero((void *)local_label_defined,sizeof(local_label_defined));
-#endif
-
-#ifndef WORKING_DOT_WORD
- if(new_broken_words) {
- struct broken_word *a;
- int possible_bytes;
- fragS *frag_tmp;
- char *frag_opcode;
- extern md_short_jump_size;
- extern md_long_jump_size;
-
- possible_bytes=md_short_jump_size+new_broken_words*md_long_jump_size;
- frag_tmp=frag_now;
- frag_opcode=frag_var(rs_broken_word,possible_bytes,possible_bytes,(relax_substateT)0,(symbolS *)broken_words,(long int)0,(char *)0);
-
- /* We want to store the pointer to where to insert the jump table in the
- fr_opcode of the rs_broken_word frag. This requires a little hackery */
- while(frag_tmp && (frag_tmp->fr_type!=rs_broken_word || frag_tmp->fr_opcode))
- frag_tmp=frag_tmp->fr_next;
- know(frag_tmp);
- frag_tmp->fr_opcode=frag_opcode;
- new_broken_words = 0;
-
- for(a=broken_words;a && a->dispfrag==0;a=a->next_broken_word)
- a->dispfrag=frag_tmp;
- }
-#endif
- if (symbolP = symbol_table_lookup( sym_name ))
- {
-#ifdef VMS
- /*
- * If the new symbol is .comm AND it has a size of zero,
- * we ignore it (i.e. the old symbol overrides it)
- */
- if ((seg_N_TYPE [(int) now_seg] == (N_UNDF | N_EXT)) &&
- ((obstack_next_free(& frags) - frag_now -> fr_literal) == 0))
- return;
- /*
- * If the old symbol is .comm and it has a size of zero,
- * we override it with the new symbol value.
- */
- if ((symbolP -> sy_type == (N_UNDF | N_EXT)) &&
- (symbolP->sy_value == 0)) {
- symbolP -> sy_frag = frag_now;
- symbolP -> sy_other = const_flag;
- symbolP -> sy_value = obstack_next_free(& frags) - frag_now -> fr_literal;
- symbolP -> sy_type |= seg_N_TYPE [(int) now_seg]; /* keep N_EXT bit */
- return;
- }
-#endif /* VMS */
- /*
- * Now check for undefined symbols
- */
- if ((symbolP -> sy_type & N_TYPE) == N_UNDF)
- {
- if( symbolP -> sy_other == 0
- && symbolP -> sy_desc == 0
- && symbolP -> sy_value == 0)
- {
- symbolP -> sy_frag = frag_now;
-#ifdef VMS
- symbolP -> sy_other = const_flag;
-#endif
- symbolP -> sy_value = obstack_next_free(& frags) - frag_now -> fr_literal;
- know( N_UNDF == 0 );
- symbolP -> sy_type |= seg_N_TYPE [(int) now_seg]; /* keep N_EXT bit */
- }
- else
- {
-#ifdef VMS
- /*
- * There are still several cases to check:
- * A .comm/.lcomm symbol being redefined as
- * initialized data is OK
- * A .comm/.lcomm symbol being redefined with
- * a larger size is also OK
- */
- char New_Type = seg_N_TYPE [(int) now_seg];
- if (((symbolP->sy_type == (N_UNDF | N_EXT)) ||
- (symbolP->sy_type == N_BSS)) &&
- (((New_Type & ~N_EXT) == N_DATA) ||
- (New_Type == symbolP->sy_type))) {
- /*
- * Select which of the 2 cases this is
- */
- if (New_Type == symbolP->sy_type) {
- /*
- * If the new size is larger we just
- * change its value. If the new size
- * is smaller, we ignore this symbol
- */
- if (symbolP->sy_value <
- (obstack_next_free(& frags) -
- frag_now -> fr_literal)) {
- symbolP -> sy_value =
- obstack_next_free(& frags) -
- frag_now -> fr_literal;
- }
- } else {
- /*
- * It is a .comm/.lcomm being converted
- * to initialized data.
- */
- symbolP -> sy_frag = frag_now;
- symbolP -> sy_other = const_flag;
- symbolP -> sy_value = obstack_next_free(& frags) - frag_now -> fr_literal;
- symbolP -> sy_type |= seg_N_TYPE [(int) now_seg]; /* keep N_EXT bit */
- }
- } else {
-#endif /* VMS */
- as_fatal( "Symbol \"%s\" is already defined as \"%s\"/%d.%d.%d.",
- sym_name,
- seg_name [(int) N_TYPE_seg [symbolP -> sy_type & N_TYPE]],
- symbolP -> sy_other, symbolP -> sy_desc,
- symbolP -> sy_value);
-#ifdef VMS
- }
-#endif /* VMS */
- }
- }
- else
- {
- as_fatal("Symbol %s already defined.",sym_name);
- }
- }
- else
- {
- symbolP = symbol_new (sym_name,
- (unsigned char)(seg_N_TYPE [(int) now_seg]),
-#ifdef VMS
- const_flag,
-#else
- 0,
-#endif
- 0,
- (valueT)(obstack_next_free(&frags)-frag_now->fr_literal),
- frag_now);
- symbol_table_insert (symbolP);
- }
-}
-
-
-/*
- * symbol_table_insert()
- *
- * Die if we can't insert the symbol.
- *
- */
-
-void
-symbol_table_insert (symbolP)
- struct symbol * symbolP;
-{
- register char * error_string;
-
- know( symbolP );
- know( symbolP -> sy_name );
- if ( * (error_string = hash_jam (sy_hash, symbolP -> sy_name, (char *)symbolP)))
- {
- as_fatal( "Inserting \"%s\" into symbol table failed: %s",
- symbolP -> sy_name, error_string);
- }
-}
-
-/*
- * 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_table_lookup (name);
- if (symbolP == NULL)
- {
- symbolP = symbol_new (name, N_UNDF, 0, 0, 0, & zero_address_frag);
- symbol_table_insert (symbolP);
- }
- return (symbolP);
-}
-
-/*
- * 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)
- char * name;
-{
- return ( (symbolS *) hash_find( sy_hash, name ));
-}
-
-
-/* end: symbols.c */
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