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char rcsid_map[] = "$Id$";
#include <stdio.h>
#include <string.h>
#include "b.h"
#include "fe.h"
Mapping globalMap;
static void growMapping ARGS((Mapping));
static int hash ARGS((Item_Set, int));
Mapping
newMapping(size) int size;
{
Mapping m;
m = (Mapping) zalloc(sizeof(struct mapping));
assert(m);
m->count = 0;
m->hash = (List*) zalloc(size * sizeof(List));
m->hash_size = size;
m->max_size = STATES_INCR;
m->set = (Item_Set*) zalloc(m->max_size * sizeof(Item_Set));
assert(m->set);
return m;
}
static void
growMapping(m) Mapping m;
{
Item_Set *tmp;
m->max_size += STATES_INCR;
tmp = (Item_Set*) zalloc(m->max_size * sizeof(Item_Set));
memcpy(tmp, m->set, m->count * sizeof(Item_Set));
zfree(m->set);
m->set = tmp;
}
static int
hash(ts, mod) Item_Set ts; int mod;
{
register Item *p = ts->virgin;
register int v;
register Relevant r = ts->relevant;
register int nt;
if (!ts->op) {
return 0;
}
v = 0;
for (; (nt = *r) != 0; r++) {
v ^= ((int)p[nt].rule) + (PRINCIPLECOST(p[nt].delta)<<4);
}
v >>= 4;
v &= (mod-1);
return v;
}
Item_Set
encode(m, ts, new) Mapping m; Item_Set ts; int *new;
{
int h;
List l;
assert(m);
assert(ts);
assert(m->count <= m->max_size);
if (grammarNts && errorState && m == globalMap) {
List l;
int found;
found = 0;
for (l = grammarNts; l; l = l->next) {
Symbol s;
s = (Symbol) l->x;
if (ts->virgin[s->u.nt->num].rule) {
found = 1;
break;
}
}
if (!found) {
*new = 0;
return errorState;
}
}
*new = 0;
h = hash(ts, m->hash_size);
for (l = m->hash[h]; l; l = l->next) {
Item_Set s = (Item_Set) l->x;
if (ts->op == s->op && equivSet(ts, s)) {
ts->num = s->num;
return s;
}
}
if (m->count >= m->max_size) {
growMapping(m);
}
assert(m->count < m->max_size);
m->set[m->count] = ts;
ts->num = m->count++;
*new = 1;
m->hash[h] = newList(ts, m->hash[h]);
return ts;
}
Item_Set
decode(m, t) Mapping m; ItemSetNum t;
{
assert(m);
assert(t);
assert(m->count < m->max_size);
assert(t < m->count);
return m->set[t];
}
void
dumpMapping(m) Mapping m;
{
int i;
printf("BEGIN Mapping: Size=%d\n", m->count);
for (i = 0; i < m->count; i++) {
dumpItem_Set(m->set[i]);
}
printf("END Mapping\n");
}
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