mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-17 10:26:15 +00:00
0c8de5b03c
Among all the modifications, this new byacc also solves a 14 year old bug [1] PR: bin/23254 [1] Submitted by: marka@nominum.com [1] MFC after: 3 weeks
124 lines
1.9 KiB
C
124 lines
1.9 KiB
C
/* $Id: symtab.c,v 1.11 2014/03/26 00:17:09 Tom.Shields Exp $ */
|
|
|
|
#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
|
|
|
|
static bucket **symbol_table = 0;
|
|
bucket *first_symbol;
|
|
bucket *last_symbol;
|
|
|
|
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 != 0);
|
|
|
|
bp = TMALLOC(bucket, 1);
|
|
NO_SPACE(bp);
|
|
|
|
bp->link = 0;
|
|
bp->next = 0;
|
|
|
|
bp->name = TMALLOC(char, strlen(name) + 1);
|
|
NO_SPACE(bp->name);
|
|
|
|
bp->tag = 0;
|
|
bp->value = UNDEFINED;
|
|
bp->index = 0;
|
|
bp->prec = 0;
|
|
bp->class = UNKNOWN;
|
|
bp->assoc = TOKEN;
|
|
#if defined(YYBTYACC)
|
|
bp->args = -1;
|
|
bp->argnames = 0;
|
|
bp->argtags = 0;
|
|
bp->destructor = 0;
|
|
#endif
|
|
strcpy(bp->name, name);
|
|
|
|
return (bp);
|
|
}
|
|
|
|
bucket *
|
|
lookup(const 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 = TMALLOC(bucket *, TABLE_SIZE);
|
|
NO_SPACE(symbol_table);
|
|
|
|
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);
|
|
}
|
|
}
|