162 lines
3.7 KiB
C
162 lines
3.7 KiB
C
/* $NetBSD: symtab.c,v 1.12 2009/04/14 09:41:31 lukem Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1989 The Regents of the University of California.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* Robert Paul Corbett.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
#if defined(__RCSID) && !defined(lint)
|
|
#if 0
|
|
static char sccsid[] = "@(#)symtab.c 5.3 (Berkeley) 6/1/90";
|
|
#else
|
|
__RCSID("$NetBSD: symtab.c,v 1.12 2009/04/14 09:41:31 lukem Exp $");
|
|
#endif
|
|
#endif /* not lint */
|
|
|
|
#include "defs.h"
|
|
|
|
/* TABLE_SIZE is the number of entries in the symbol table. */
|
|
/* TABLE_SIZE must be a power of two. */
|
|
|
|
#define TABLE_SIZE 1024
|
|
|
|
|
|
bucket *first_symbol;
|
|
bucket *last_symbol;
|
|
|
|
static bucket **symbol_table;
|
|
|
|
static int hash(const char *);
|
|
|
|
|
|
static int
|
|
hash(const char *name)
|
|
{
|
|
const char *s;
|
|
int c, k;
|
|
|
|
assert(name && *name);
|
|
s = name;
|
|
k = *s;
|
|
while ((c = *++s) != '\0')
|
|
k = (31*k + c) & (TABLE_SIZE - 1);
|
|
|
|
return (k);
|
|
}
|
|
|
|
|
|
bucket *
|
|
make_bucket(const char *name)
|
|
{
|
|
bucket *bp;
|
|
|
|
assert(name);
|
|
bp = (bucket *) MALLOC(sizeof(bucket));
|
|
if (bp == 0) no_space();
|
|
bp->link = 0;
|
|
bp->next = 0;
|
|
bp->name = strdup(name);
|
|
if (bp->name == 0) no_space();
|
|
bp->tag = 0;
|
|
bp->value = UNDEFINED;
|
|
bp->index = 0;
|
|
bp->prec = 0;
|
|
bp-> class = UNKNOWN;
|
|
bp->assoc = TOKEN;
|
|
|
|
return (bp);
|
|
}
|
|
|
|
|
|
bucket *
|
|
lookup(char *name)
|
|
{
|
|
bucket *bp, **bpp;
|
|
|
|
bpp = symbol_table + hash(name);
|
|
bp = *bpp;
|
|
|
|
while (bp)
|
|
{
|
|
if (strcmp(name, bp->name) == 0) return (bp);
|
|
bpp = &bp->link;
|
|
bp = *bpp;
|
|
}
|
|
|
|
*bpp = bp = make_bucket(name);
|
|
last_symbol->next = bp;
|
|
last_symbol = bp;
|
|
|
|
return (bp);
|
|
}
|
|
|
|
|
|
void
|
|
create_symbol_table(void)
|
|
{
|
|
int i;
|
|
bucket *bp;
|
|
|
|
symbol_table = (bucket **) MALLOC(TABLE_SIZE*sizeof(bucket *));
|
|
if (symbol_table == 0) no_space();
|
|
for (i = 0; i < TABLE_SIZE; i++)
|
|
symbol_table[i] = 0;
|
|
|
|
bp = make_bucket("error");
|
|
bp->index = 1;
|
|
bp->class = TERM;
|
|
|
|
first_symbol = bp;
|
|
last_symbol = bp;
|
|
symbol_table[hash("error")] = bp;
|
|
}
|
|
|
|
|
|
void
|
|
free_symbol_table(void)
|
|
{
|
|
FREE(symbol_table);
|
|
symbol_table = 0;
|
|
}
|
|
|
|
|
|
void
|
|
free_symbols(void)
|
|
{
|
|
bucket *p, *q;
|
|
|
|
for (p = first_symbol; p; p = q)
|
|
{
|
|
q = p->next;
|
|
FREE(p);
|
|
}
|
|
}
|