151 lines
2.6 KiB
C
151 lines
2.6 KiB
C
/* Symbol table manager for Bison,
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Copyright (C) 1984, 1989 Free Software Foundation, Inc.
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This file is part of Bison, the GNU Compiler Compiler.
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Bison is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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Bison is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Bison; see the file COPYING. If not, write to
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the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <stdio.h>
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#include "system.h"
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#include "alloc.h"
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#include "symtab.h"
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#include "gram.h"
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bucket **symtab;
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bucket *firstsymbol;
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bucket *lastsymbol;
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void tabinit PARAMS((void));
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void free_symtab PARAMS((void));
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static int
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hash (char *key)
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{
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register char *cp;
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register int k;
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cp = key;
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k = 0;
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while (*cp)
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k = ((k << 1) ^ (*cp++)) & 0x3fff;
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return (k % TABSIZE);
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}
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static char *
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copys (char *s)
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{
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register int i;
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register char *cp;
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register char *result;
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i = 1;
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for (cp = s; *cp; cp++)
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i++;
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result = xmalloc((unsigned int)i);
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strcpy(result, s);
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return (result);
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}
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void
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tabinit (void)
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{
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/* register int i; JF unused */
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symtab = NEW2(TABSIZE, bucket *);
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firstsymbol = NULL;
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lastsymbol = NULL;
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}
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bucket *
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getsym (char *key)
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{
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register int hashval;
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register bucket *bp;
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register int found;
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hashval = hash(key);
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bp = symtab[hashval];
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found = 0;
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while (bp != NULL && found == 0)
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{
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if (strcmp(key, bp->tag) == 0)
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found = 1;
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else
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bp = bp->link;
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}
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if (found == 0)
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{
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nsyms++;
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bp = NEW(bucket);
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bp->link = symtab[hashval];
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bp->next = NULL;
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bp->tag = copys(key);
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bp->class = SUNKNOWN;
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if (firstsymbol == NULL)
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{
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firstsymbol = bp;
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lastsymbol = bp;
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}
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else
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{
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lastsymbol->next = bp;
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lastsymbol = bp;
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}
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symtab[hashval] = bp;
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}
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return (bp);
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}
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void
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free_symtab (void)
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{
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register int i;
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register bucket *bp,*bptmp;/* JF don't use ptr after free */
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for (i = 0; i < TABSIZE; i++)
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{
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bp = symtab[i];
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while (bp)
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{
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bptmp = bp->link;
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#if 0 /* This causes crashes because one string can appear more than once. */
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if (bp->type_name)
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FREE(bp->type_name);
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#endif
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FREE(bp);
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bp = bptmp;
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}
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}
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FREE(symtab);
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}
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