mirror of
https://github.com/freebsd/freebsd-src
synced 2024-11-05 18:22:52 +00:00
9f36c7f497
In case you're wondering, the gcc-2.7.2.1 import uses this to generate code. The size of the generated code is bigger than the entire bison release, making this a saving. The bison doc is pretty good apparently.
150 lines
2.5 KiB
C
150 lines
2.5 KiB
C
/* Symbol table manager for Bison,
|
|
Copyright (C) 1984, 1989 Free Software Foundation, Inc.
|
|
|
|
This file is part of Bison, the GNU Compiler Compiler.
|
|
|
|
Bison 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.
|
|
|
|
Bison 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 Bison; see the file COPYING. If not, write to
|
|
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
|
|
|
|
|
|
#include <stdio.h>
|
|
#include "system.h"
|
|
#include "new.h"
|
|
#include "symtab.h"
|
|
#include "gram.h"
|
|
|
|
|
|
bucket **symtab;
|
|
bucket *firstsymbol;
|
|
bucket *lastsymbol;
|
|
|
|
|
|
|
|
int
|
|
hash(key)
|
|
char *key;
|
|
{
|
|
register char *cp;
|
|
register int k;
|
|
|
|
cp = key;
|
|
k = 0;
|
|
while (*cp)
|
|
k = ((k << 1) ^ (*cp++)) & 0x3fff;
|
|
|
|
return (k % TABSIZE);
|
|
}
|
|
|
|
|
|
|
|
char *
|
|
copys(s)
|
|
char *s;
|
|
{
|
|
register int i;
|
|
register char *cp;
|
|
register char *result;
|
|
|
|
i = 1;
|
|
for (cp = s; *cp; cp++)
|
|
i++;
|
|
|
|
result = xmalloc((unsigned int)i);
|
|
strcpy(result, s);
|
|
return (result);
|
|
}
|
|
|
|
|
|
void
|
|
tabinit()
|
|
{
|
|
/* register int i; JF unused */
|
|
|
|
symtab = NEW2(TABSIZE, bucket *);
|
|
|
|
firstsymbol = NULL;
|
|
lastsymbol = NULL;
|
|
}
|
|
|
|
|
|
bucket *
|
|
getsym(key)
|
|
char *key;
|
|
{
|
|
register int hashval;
|
|
register bucket *bp;
|
|
register int found;
|
|
|
|
hashval = hash(key);
|
|
bp = symtab[hashval];
|
|
|
|
found = 0;
|
|
while (bp != NULL && found == 0)
|
|
{
|
|
if (strcmp(key, bp->tag) == 0)
|
|
found = 1;
|
|
else
|
|
bp = bp->link;
|
|
}
|
|
|
|
if (found == 0)
|
|
{
|
|
nsyms++;
|
|
|
|
bp = NEW(bucket);
|
|
bp->link = symtab[hashval];
|
|
bp->next = NULL;
|
|
bp->tag = copys(key);
|
|
bp->class = SUNKNOWN;
|
|
|
|
if (firstsymbol == NULL)
|
|
{
|
|
firstsymbol = bp;
|
|
lastsymbol = bp;
|
|
}
|
|
else
|
|
{
|
|
lastsymbol->next = bp;
|
|
lastsymbol = bp;
|
|
}
|
|
|
|
symtab[hashval] = bp;
|
|
}
|
|
|
|
return (bp);
|
|
}
|
|
|
|
|
|
void
|
|
free_symtab()
|
|
{
|
|
register int i;
|
|
register bucket *bp,*bptmp;/* JF don't use ptr after free */
|
|
|
|
for (i = 0; i < TABSIZE; i++)
|
|
{
|
|
bp = symtab[i];
|
|
while (bp)
|
|
{
|
|
bptmp = bp->link;
|
|
#if 0 /* This causes crashes because one string can appear more than once. */
|
|
if (bp->type_name)
|
|
FREE(bp->type_name);
|
|
#endif
|
|
FREE(bp);
|
|
bp = bptmp;
|
|
}
|
|
}
|
|
FREE(symtab);
|
|
}
|