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yap-6.3/C/exo.c

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