499 lines
12 KiB
C
499 lines
12 KiB
C
/*************************************************************************
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* *
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* YAP Prolog *
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* *
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* Yap Prolog was developed at NCCUP - Universidade do Porto *
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* *
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* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
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* *
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**************************************************************************
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* *
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* File: exo.c *
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* comments: Exo compilation *
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* *
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* Last rev: $Date: 2008-07-22 23:34:44 $,$Author: vsc $ * *
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* $Log: not supported by cvs2svn $ *
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* *
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* *
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*************************************************************************/
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#include "Yap.h"
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#include "clause.h"
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#include "yapio.h"
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#include "eval.h"
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#include "tracer.h"
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#ifdef YAPOR
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#include "or.macros.h"
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#endif /* YAPOR */
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#ifdef TABLING
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#include "tab.macros.h"
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#endif /* TABLING */
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#if HAVE_STRING_H
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#include <string.h>
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#endif
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//static int exo_write=FALSE;
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//void do_write(void) { exo_write=TRUE;}
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#define NEXTOP(V,TYPE) ((yamop *)(&((V)->u.TYPE.next)))
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#define MAX_ARITY 256
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/* Simple hash function:
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first component is the base key.
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hash0 spreads extensions coming from different elements.
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spread over j quadrants.
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*/
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static UInt
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HASH(UInt hash0, UInt j, CELL *cl, struct index_t *it)
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{
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Term t = cl[j];
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UInt sz = it->hsize;
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if (IsIntTerm(t))
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return (17*(IntOfTerm(t) + (hash0+1)*j ) ) % sz;
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return (17*(((UInt)AtomOfTerm(t)>>5) + (hash0+1)*j ) ) % sz;
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}
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static UInt
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NEXT(UInt hash, Term t, UInt j, struct index_t *it)
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{
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return (hash+(j+1)*997) % (it->hsize);
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}
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/* search for matching elements */
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static int
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MATCH(CELL *clp, CELL *kvp, UInt j, struct index_t *it, UInt bnds[])
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{
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if ((kvp - it->cls)%it->arity != j)
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return FALSE;
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do {
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if ( bnds[j] && *clp != *kvp)
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return FALSE;
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clp--;
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kvp--;
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} while (j-- != 0);
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return TRUE;
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}
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static void
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ADD_TO_TRY_CHAIN(CELL *kvp, CELL *cl, struct index_t *it)
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{
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UInt old = (kvp-it->cls)/it->arity;
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UInt new = (cl-it->cls)/it->arity;
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UInt *links = it->links;
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UInt tmp = links[old]; /* points to the end of the chain */
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if (!tmp) {
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links[old] = links[new] = new;
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} else {
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links[new] = links[tmp];
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links[tmp] = new;
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links[old] = new;
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}
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}
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/* This is the critical routine, it builds the hash table *
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* each HT field stores a key pointer which is actually
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* a pointer to the point in the clause where one can find the element.
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*
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* The cls table indexes all elements that can be reached using that key.
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*
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* Insert:
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* j = first
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* not match cij -> insert, open new chain
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* match ci..j ck..j -> find j = minarg(cij \= c2j),
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* else j = +inf -> c2+ci
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* Lookup:
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* j= first
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* not match cij -> fail
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* match ci..j ck..j -> find j = minarg(cij \= c2j)
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* else
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*/
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static void
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INSERT(CELL *cl, struct index_t *it, UInt arity, UInt base, UInt hash0, UInt bnds[])
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{
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UInt j = base;
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CELL *kvp;
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UInt hash;
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/* skip over argument */
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while (!bnds[j]) {
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j++;
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}
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/* j is the firs bound element */
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/* check if we match */
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hash = hash0 = HASH(hash0, j, cl, it);
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//if (exo_write) printf("h=%ld j=%ld %lx\n", hash, j, cl[j]);
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next:
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/* loop to insert element */
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kvp = it->key[hash];
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if (kvp == NULL) {
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/* simple case, new entry */
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it->nentries++;
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it->key[hash] = cl+j;
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return;
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} else if (MATCH(cl+j, kvp, j, it, bnds)) {
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/* collision */
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UInt k;
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CELL *target;
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for (k =j+1, target = kvp+1; k < arity; k++,target++ ) {
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if (bnds[k]) {
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if (*target != cl[k]) {
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/* found a new forking point */
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// printf("j=%ld hash0=%ld cl[j]=%lx\n", j, hash0, cl[j]);
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INSERT(cl, it, arity, k, hash0, bnds);
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return;
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}
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}
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}
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it->ntrys++;
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ADD_TO_TRY_CHAIN(kvp, cl, it);
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return;
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} else {
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it->ncollisions++;
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hash = NEXT(hash, cl[j], j, it);
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//if (exo_write) printf("N=%ld\n", hash);
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goto next;
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}
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}
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static yamop *
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LOOKUP(struct index_t *it, UInt arity, UInt j, UInt bnds[])
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{
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CACHE_REGS
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CELL *kvp;
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UInt hash, hash0 = 0;
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/* j is the firs bound element */
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/* check if we match */
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hash:
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hash = hash0 = HASH(hash0, j, XREGS+1, it);
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next:
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/* loop to insert element */
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kvp = it->key[hash];
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if (kvp == NULL) {
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/* simple case, no element */
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return FAILCODE;
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} else if (MATCH(XREGS+(j+1), kvp, j, it, bnds)) {
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/* found element */
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UInt k;
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CELL *target;
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for (k =j+1, target = kvp+1; k < arity; k++ ) {
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if (bnds[k]) {
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if (*target != XREGS[k+1]) {
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j = k;
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goto hash;
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}
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}
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target++;
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}
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S = target-arity;
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if (!it->is_key && it->links[(S-it->cls)/arity])
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return it->code;
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else
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return NEXTOP(NEXTOP(it->code,lp),lp);
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} else {
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/* collision */
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hash = NEXT(hash, XREGS[j+1], j, it);
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goto next;
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}
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}
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static void
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fill_hash(UInt bmap, struct index_t *it, UInt bnds[])
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{
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UInt i;
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UInt arity = it->arity;
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CELL *cl = it->cls;
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for (i=0; i < it->nels; i++) {
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INSERT(cl, it, arity, 0, 0, bnds);
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cl += arity;
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}
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for (i=0; i < it->hsize; i++) {
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if (it->key[i]) {
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UInt offset = (it->key[i]-it->cls)/arity;
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UInt last = it->links[offset];
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if (last) {
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/* the chain used to point straight to the last, and the last back to the origibal first */
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it->links[offset] = it->links[last];
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it->links[last] = 0;
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}
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}
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}
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}
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static struct index_t *
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add_index(struct index_t **ip, UInt bmap, PredEntry *ap, UInt count, UInt bnds[])
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{
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UInt ncls = ap->cs.p_code.NOfClauses, j;
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CELL *base = NULL;
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struct index_t *i;
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size_t sz;
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yamop *ptr;
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sz = (CELL)NEXTOP(NEXTOP((yamop*)NULL,lp),lp)+ap->ArityOfPE*(CELL)NEXTOP((yamop *)NULL,x) +(CELL)NEXTOP(NEXTOP((yamop *)NULL,p),l);
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if (!(i = (struct index_t *)Yap_AllocCodeSpace(sizeof(struct index_t)+sz))) {
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CACHE_REGS
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save_machine_regs();
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LOCAL_Error_Size = 3*ncls*sizeof(CELL);
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LOCAL_ErrorMessage = "not enough space to index";
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Yap_Error(OUT_OF_HEAP_ERROR, TermNil, LOCAL_ErrorMessage);
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return NULL;
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}
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i->next = *ip;
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i->prev = NULL;
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i->nels = ncls;
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i->arity = ap->ArityOfPE;
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i->ap = ap;
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i->bmap = bmap;
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i->is_key = FALSE;
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i->hsize = 2*ncls;
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if (count) {
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if (!(base = (CELL *)Yap_AllocCodeSpace(sizeof(CELL)*(ncls+i->hsize)))) {
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CACHE_REGS
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save_machine_regs();
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LOCAL_Error_Size = 3*ncls*sizeof(CELL);
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LOCAL_ErrorMessage = "not enough space to generate indices";
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Yap_FreeCodeSpace((void *)i);
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Yap_Error(OUT_OF_HEAP_ERROR, TermNil, LOCAL_ErrorMessage);
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return NULL;
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}
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bzero(base, 3*sizeof(CELL)*ncls);
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}
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i->key = (CELL **)base;
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i->links = (CELL *)(base+i->hsize);
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i->ncollisions = i->nentries = i->ntrys = 0;
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i->cls = (CELL *)((ADDR)ap->cs.p_code.FirstClause+2*sizeof(struct index_t *));
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*ip = i;
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if (count) {
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fill_hash(bmap, i, bnds);
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printf("entries=%ld collisions=%ld trys=%ld\n", i->nentries, i->ncollisions, i->ntrys);
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if (!i->ntrys) {
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i->is_key = TRUE;
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if (base != realloc(base, i->hsize*sizeof(CELL)))
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return FALSE;
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}
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}
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ptr = (yamop *)(i+1);
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i->code = ptr;
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if (count)
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ptr->opc = Yap_opcode(_try_exo);
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else
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ptr->opc = Yap_opcode(_try_all_exo);
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ptr->u.lp.l = (yamop *)i;
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ptr->u.lp.p = ap;
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ptr = NEXTOP(ptr, lp);
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if (count)
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ptr->opc = Yap_opcode(_retry_exo);
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else
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ptr->opc = Yap_opcode(_retry_all_exo);
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ptr->u.lp.p = ap;
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ptr->u.lp.l = (yamop *)i;
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ptr = NEXTOP(ptr, lp);
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for (j = 0; j < i->arity; j++) {
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ptr->opc = Yap_opcode(_get_atom_exo);
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#if PRECOMPUTE_REGADDRESS
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ptr->u.x.x = (CELL) (XREGS + (j+1));
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#else
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ptr->u.x.x = j+1;
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#endif
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ptr = NEXTOP(ptr, x);
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}
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ptr->opc = Yap_opcode(_procceed);
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ptr->u.p.p = ap;
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ptr = NEXTOP(ptr, p);
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ptr->opc = Yap_opcode(_Ystop);
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ptr->u.l.l = i->code;
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return i;
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}
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yamop *
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Yap_ExoLookup(PredEntry *ap USES_REGS)
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{
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UInt arity = ap->ArityOfPE;
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UInt bmap = 0L, bit = 1, count = 0, j, j0 = 0;
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struct index_t **ip = (struct index_t **)(ap->cs.p_code.FirstClause);
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struct index_t *i = *ip;
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for (j=0; j< arity; j++, bit<<=1) {
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Term t = Deref(XREGS[j+1]);
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if (!IsVarTerm(t)) {
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bmap += bit;
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LOCAL_ibnds[j] = TRUE;
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if (!count) j0= j;
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count++;
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} else {
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LOCAL_ibnds[j] = FALSE;
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}
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XREGS[j+1] = t;
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}
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while (i) {
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if (i->is_key) {
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if ((i->bmap & bmap) == i->bmap) {
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break;
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}
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} else {
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if (i->bmap == bmap) {
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break;
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}
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}
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ip = &i->next;
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i = i->next;
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}
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if (!i) {
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i = add_index(ip, bmap, ap, count, LOCAL_ibnds);
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}
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if (count)
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return LOOKUP(i, arity, j0, LOCAL_ibnds);
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else
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return i->code;
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}
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CELL
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Yap_NextExo(choiceptr cptr, struct index_t *it)
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{
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CACHE_REGS
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CELL offset = EXO_ADDRESS_TO_OFFSET(it,(CELL *)((CELL *)(B+1))[it->arity]);
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CELL next = it->links[offset];
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((CELL *)(B+1))[it->arity] = (CELL)EXO_OFFSET_TO_ADDRESS(it, next);
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S = it->cls+it->arity*offset;
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return next;
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}
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static Int
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p_exodb_get_space( USES_REGS1 )
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{ /* '$number_of_clauses'(Predicate,M,N) */
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Term t = Deref(ARG1);
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Term mod = Deref(ARG2);
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Term tn = Deref(ARG3);
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UInt arity;
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Prop pe;
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PredEntry *ap;
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MegaClause *mcl;
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UInt ncls;
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UInt required;
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struct index_t **li;
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if (IsVarTerm(mod) || !IsAtomTerm(mod)) {
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return(FALSE);
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}
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if (IsAtomTerm(t)) {
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Atom a = AtomOfTerm(t);
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arity = 0;
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pe = PredPropByAtom(a, mod);
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} else if (IsApplTerm(t)) {
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register Functor f = FunctorOfTerm(t);
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arity = ArityOfFunctor(f);
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pe = PredPropByFunc(f, mod);
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} else {
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return FALSE;
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}
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if (EndOfPAEntr(pe))
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return FALSE;
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ap = RepPredProp(pe);
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if (ap->PredFlags & (DynamicPredFlag|LogUpdatePredFlag
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#ifdef TABLING
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|TabledPredFlag
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#endif /* TABLING */
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)) {
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Yap_Error(PERMISSION_ERROR_MODIFY_STATIC_PROCEDURE,t,"dbload_get_space/4");
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return FALSE;
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}
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if (IsVarTerm(tn) || !IsIntegerTerm(tn)) {
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return FALSE;
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}
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ncls = IntegerOfTerm(tn);
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if (ncls <= 1) {
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return FALSE;
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}
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required = ncls*arity*sizeof(CELL)+sizeof(MegaClause)+2*sizeof(struct index_t *);
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while (!(mcl = (MegaClause *)Yap_AllocCodeSpace(required))) {
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if (!Yap_growheap(FALSE, required, NULL)) {
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/* just fail, the system will keep on going */
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return FALSE;
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}
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}
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Yap_ClauseSpace += required;
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/* cool, it's our turn to do the conversion */
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mcl->ClFlags = MegaMask|ExoMask;
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mcl->ClSize = required;
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mcl->ClPred = ap;
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mcl->ClItemSize = arity*sizeof(CELL);
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mcl->ClNext = NULL;
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li = (struct index_t **)(mcl->ClCode);
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li[0] = li[1] = NULL;
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ap->cs.p_code.FirstClause =
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ap->cs.p_code.LastClause =
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mcl->ClCode;
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ap->PredFlags |= MegaClausePredFlag|SourcePredFlag;
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ap->cs.p_code.NOfClauses = ncls;
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if (ap->PredFlags & (SpiedPredFlag|CountPredFlag|ProfiledPredFlag)) {
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ap->OpcodeOfPred = Yap_opcode(_spy_pred);
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} else {
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ap->OpcodeOfPred = Yap_opcode(_enter_exo);
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}
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ap->CodeOfPred = ap->cs.p_code.TrueCodeOfPred = (yamop *)(&(ap->OpcodeOfPred));
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return Yap_unify(ARG4, MkIntegerTerm((Int)mcl));
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}
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#define DerefAndCheck(t, V) \
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t = Deref(V); if(IsVarTerm(t) || !(IsAtomOrIntTerm(t))) Yap_Error(TYPE_ERROR_ATOM, t0, "load_db");
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static int
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store_exo(yamop *pc, UInt arity, Term t0)
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{
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Term t;
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CELL *tp = RepAppl(t0)+1,
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*cpc = (CELL *)pc;
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UInt i;
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for (i = 0; i< arity; i++) {
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DerefAndCheck(t, tp[0]);
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*cpc = t;
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tp++;
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cpc++;
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}
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return TRUE;
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}
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static Int
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p_exoassert( USES_REGS1 )
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{ /* '$number_of_clauses'(Predicate,M,N) */
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Term thandle = Deref(ARG2);
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Term tn = Deref(ARG3);
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PredEntry *pe;
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MegaClause *mcl;
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Int n;
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if (IsVarTerm(thandle) || !IsIntegerTerm(thandle)) {
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return FALSE;
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}
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mcl = (MegaClause *)IntegerOfTerm(thandle);
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if (IsVarTerm(tn) || !IsIntegerTerm(tn)) {
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return FALSE;
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}
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n = IntegerOfTerm(tn);
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pe = mcl->ClPred;
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return store_exo((yamop *)((ADDR)mcl->ClCode+2*sizeof(struct index_t *)+n*(mcl->ClItemSize)),pe->ArityOfPE, Deref(ARG1));
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}
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void
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Yap_InitExoPreds(void)
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{
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CACHE_REGS
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Term cm = CurrentModule;
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CurrentModule = DBLOAD_MODULE;
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Yap_InitCPred("exo_db_get_space", 4, p_exodb_get_space, 0L);
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Yap_InitCPred("exoassert", 3, p_exoassert, 0L);
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CurrentModule = cm;
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}
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