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115 lines
1.9 KiB
C
115 lines
1.9 KiB
C
char rcsid_map[] = "$Id: map.c,v 1.1 1998/12/17 06:36:48 fur%netscape.com Exp $";
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#include "b.h"
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#include <stdio.h>
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#include <string.h>
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Mapping globalMap;
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static void growMapping ARGS((Mapping));
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static int hash ARGS((Item_Set, int));
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Mapping
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newMapping(size) int size;
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{
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Mapping m;
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m = (Mapping) zalloc(sizeof(struct mapping));
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assert(m);
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m->count = 0;
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m->hash = (List*) zalloc(size * sizeof(List));
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m->hash_size = size;
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m->max_size = STATES_INCR;
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m->set = (Item_Set*) zalloc(m->max_size * sizeof(Item_Set));
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assert(m->set);
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return m;
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}
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static void
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growMapping(m) Mapping m;
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{
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Item_Set *tmp;
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m->max_size += STATES_INCR;
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tmp = (Item_Set*) zalloc(m->max_size * sizeof(Item_Set));
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memcpy(tmp, m->set, m->count * sizeof(Item_Set));
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zfree(m->set);
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m->set = tmp;
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}
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static int
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hash(ts, mod) Item_Set ts; int mod;
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{
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register Item *p = ts->virgin;
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register int v;
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register Relevant r = ts->relevant;
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register int nt;
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if (!ts->op) {
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return 0;
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}
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v = 0;
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for (; (nt = *r) != 0; r++) {
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v ^= ((int)p[nt].rule) + (PRINCIPLECOST(p[nt].delta)<<4);
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}
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v >>= 4;
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v &= (mod-1);
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return v;
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}
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Item_Set
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encode(m, ts, new) Mapping m; Item_Set ts; int *new;
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{
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int h;
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List l;
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assert(m);
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assert(ts);
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assert(m->count <= m->max_size);
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*new = 0;
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h = hash(ts, m->hash_size);
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for (l = m->hash[h]; l; l = l->next) {
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Item_Set s = (Item_Set) l->x;
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if (ts->op == s->op && equivSet(ts, s)) {
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ts->num = s->num;
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return s;
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}
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}
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if (m->count >= m->max_size) {
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growMapping(m);
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}
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assert(m->count < m->max_size);
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m->set[m->count] = ts;
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ts->num = m->count++;
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*new = 1;
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m->hash[h] = newList(ts, m->hash[h]);
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return ts;
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}
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Item_Set
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decode(m, t) Mapping m; ItemSetNum t;
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{
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assert(m);
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assert(t);
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assert(m->count < m->max_size);
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assert(t < m->count);
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return m->set[t];
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}
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void
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dumpMapping(m) Mapping m;
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{
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int i;
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printf("BEGIN Mapping: Size=%d\n", m->count);
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for (i = 0; i < m->count; i++) {
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dumpItem_Set(m->set[i]);
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}
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printf("END Mapping\n");
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}
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