737 lines
17 KiB
C
737 lines
17 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: adtdefs.c *
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* Last rev: *
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* mods: *
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* comments: abstract machine definitions *
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* *
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*************************************************************************/
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#ifdef SCCS
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static char SccsId[] = "%W% %G%";
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#endif
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#define ADTDEFS_C
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#ifdef __SUNPRO_CC
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#define inline
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#endif
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#include "Yap.h"
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Prop STD_PROTO(PredPropByFunc,(Functor, SMALLUNSGN));
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Prop STD_PROTO(PredPropByAtom,(Atom, SMALLUNSGN));
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#include "Yatom.h"
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#include "Heap.h"
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#include "yapio.h"
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#include <stdio.h>
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#if HAVE_STRING_H
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#include <string.h>
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#endif
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/* this routine must be run at least having a read lock on ae */
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static Prop
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GetFunctorProp(AtomEntry *ae, unsigned int arity)
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{ /* look property list of atom a for kind */
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FunctorEntry *pp;
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pp = RepFunctorProp(ae->PropsOfAE);
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while (!EndOfPAEntr(pp) &&
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(!IsFunctorProperty(pp->KindOfPE) ||
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pp->ArityOfFE != arity))
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pp = RepFunctorProp(pp->NextOfPE);
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return (AbsFunctorProp(pp));
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}
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/* vsc: We must guarantee that IsVarTerm(functor) returns true! */
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static inline Functor
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InlinedUnlockedMkFunctor(AtomEntry *ae, unsigned int arity)
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{
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FunctorEntry *p;
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Prop p0;
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p0 = GetFunctorProp(ae, arity);
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if (p0 != NIL) {
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return ((Functor) RepProp(p0));
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}
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p = (FunctorEntry *) _YAP_AllocAtomSpace(sizeof(*p));
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p->KindOfPE = FunctorProperty;
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p->NameOfFE = AbsAtom(ae);
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p->ArityOfFE = arity;
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p->PropsOfFE = NIL;
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p->NextOfPE = ae->PropsOfAE;
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INIT_RWLOCK(p->FRWLock);
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ae->PropsOfAE = AbsProp((PropEntry *) p);
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return ((Functor) p);
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}
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Functor
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_YAP_UnlockedMkFunctor(AtomEntry *ae, unsigned int arity)
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{
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return(InlinedUnlockedMkFunctor(ae, arity));
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}
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/* vsc: We must guarantee that IsVarTerm(functor) returns true! */
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Functor
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_YAP_MkFunctor(Atom ap, unsigned int arity)
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{
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AtomEntry *ae = RepAtom(ap);
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Functor f;
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WRITE_LOCK(ae->ARWLock);
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f = InlinedUnlockedMkFunctor(ae, arity);
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WRITE_UNLOCK(ae->ARWLock);
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return (f);
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}
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/* vsc: We must guarantee that IsVarTerm(functor) returns true! */
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void
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_YAP_MkFunctorWithAddress(Atom ap, unsigned int arity, FunctorEntry *p)
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{
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AtomEntry *ae = RepAtom(ap);
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WRITE_LOCK(ae->ARWLock);
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p->KindOfPE = FunctorProperty;
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p->NameOfFE = ap;
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p->ArityOfFE = arity;
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p->NextOfPE = RepAtom(ap)->PropsOfAE;
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ae->PropsOfAE = AbsProp((PropEntry *) p);
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WRITE_UNLOCK(ae->ARWLock);
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}
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inline static Atom
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SearchInInvisible(char *atom)
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{
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AtomEntry *chain;
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READ_LOCK(INVISIBLECHAIN.AERWLock);
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chain = RepAtom(INVISIBLECHAIN.Entry);
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while (!EndOfPAEntr(chain) && strcmp(chain->StrOfAE, atom) != 0) {
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chain = RepAtom(chain->NextOfAE);
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}
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READ_UNLOCK(INVISIBLECHAIN.AERWLock);
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if (EndOfPAEntr(chain))
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return (NIL);
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else
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return(AbsAtom(chain));
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}
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static inline Atom
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SearchAtom(unsigned char *p, Atom a) {
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AtomEntry *ae;
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/* search atom in chain */
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while (a != NIL) {
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ae = RepAtom(a);
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if (strcmp(ae->StrOfAE, (const char *)p) == 0) {
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return(a);
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}
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a = ae->NextOfAE;
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}
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return(NIL);
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}
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static Atom
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LookupAtom(char *atom)
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{ /* lookup atom in atom table */
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register CELL hash;
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register unsigned char *p;
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Atom a;
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AtomEntry *ae;
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/* compute hash */
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p = (unsigned char *)atom;
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HashFunction(p, hash);
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if (!strcmp("in line 284, system predicate see/1 at prolog:$$compile_stat/5 (clause 1)",atom))
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fprintf(stderr,"vsc: has is %d\n", hash);
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WRITE_LOCK(HashChain[hash].AERWLock);
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a = HashChain[hash].Entry;
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/* search atom in chain */
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a = SearchAtom((unsigned char *)atom, a);
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if (a != NIL) {
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WRITE_UNLOCK(HashChain[hash].AERWLock);
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return(a);
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}
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/* add new atom to start of chain */
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ae = (AtomEntry *) _YAP_AllocAtomSpace((sizeof *ae) + strlen(atom));
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a = AbsAtom(ae);
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ae->NextOfAE = HashChain[hash].Entry;
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HashChain[hash].Entry = a;
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ae->PropsOfAE = NIL;
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if (ae->StrOfAE != atom)
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strcpy(ae->StrOfAE, atom);
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INIT_RWLOCK(ae->ARWLock);
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WRITE_UNLOCK(HashChain[hash].AERWLock);
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return (a);
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}
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Atom
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_YAP_LookupAtom(char *atom)
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{ /* lookup atom in atom table */
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return(LookupAtom(atom));
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}
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Atom
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_YAP_FullLookupAtom(char *atom)
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{ /* lookup atom in atom table */
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Atom t;
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if ((t = SearchInInvisible(atom)) != NIL) {
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return (t);
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}
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return(LookupAtom(atom));
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}
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void
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_YAP_LookupAtomWithAddress(char *atom, AtomEntry *ae)
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{ /* lookup atom in atom table */
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register CELL hash;
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register unsigned char *p;
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Atom a;
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/* compute hash */
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p = (unsigned char *)atom;
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HashFunction(p, hash);
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/* ask for a WRITE lock because it is highly unlikely we shall find anything */
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WRITE_LOCK(HashChain[hash].AERWLock);
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a = HashChain[hash].Entry;
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/* search atom in chain */
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if (SearchAtom(p, a) != NIL) {
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_YAP_Error(FATAL_ERROR,TermNil,"repeated initialisation for atom %s", ae);
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WRITE_UNLOCK(HashChain[hash].AERWLock);
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return;
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}
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/* add new atom to start of chain */
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ae->NextOfAE = a;
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HashChain[hash].Entry = AbsAtom(ae);
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ae->PropsOfAE = NIL;
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strcpy(ae->StrOfAE, atom);
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INIT_RWLOCK(ae->ARWLock);
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WRITE_UNLOCK(HashChain[hash].AERWLock);
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}
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void
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_YAP_ReleaseAtom(Atom atom)
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{ /* Releases an atom from the hash chain */
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register Int hash;
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register unsigned char *p;
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AtomEntry *inChain;
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AtomEntry *ap = RepAtom(atom);
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char *name = ap->StrOfAE;
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/* compute hash */
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p = (unsigned char *)name;
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HashFunction(p, hash);
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WRITE_LOCK(HashChain[hash].AERWLock);
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if (HashChain[hash].Entry == atom) {
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HashChain[hash].Entry = ap->NextOfAE;
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WRITE_UNLOCK(HashChain[hash].AERWLock);
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return;
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}
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/* else */
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inChain = RepAtom(HashChain[hash].Entry);
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while (inChain->NextOfAE != atom)
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inChain = RepAtom(inChain->NextOfAE);
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WRITE_LOCK(inChain->ARWLock);
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inChain->NextOfAE = ap->NextOfAE;
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WRITE_UNLOCK(inChain->ARWLock);
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WRITE_UNLOCK(HashChain[hash].AERWLock);
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}
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static Prop
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GetAPropHavingLock(AtomEntry *ae, PropFlags kind)
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{ /* look property list of atom a for kind */
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PropEntry *pp;
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pp = RepProp(ae->PropsOfAE);
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while (!EndOfPAEntr(pp) && pp->KindOfPE != kind)
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pp = RepProp(pp->NextOfPE);
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return (AbsProp(pp));
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}
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Prop
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_YAP_GetAPropHavingLock(AtomEntry *ae, PropFlags kind)
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{ /* look property list of atom a for kind */
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return (GetAPropHavingLock(ae,kind));
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}
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static Prop
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GetAProp(Atom a, PropFlags kind)
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{ /* look property list of atom a for kind */
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AtomEntry *ae = RepAtom(a);
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Prop out;
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READ_LOCK(ae->ARWLock);
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out = GetAPropHavingLock(ae, kind);
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READ_UNLOCK(ae->ARWLock);
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return (out);
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}
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Prop
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_YAP_GetAProp(Atom a, PropFlags kind)
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{ /* look property list of atom a for kind */
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return GetAProp(a,kind);
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}
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inline static Prop
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GetPredPropByAtomHavingLock(AtomEntry* ae, SMALLUNSGN cur_mod)
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/* get predicate entry for ap/arity; create it if neccessary. */
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{
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Prop p0;
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p0 = ae->PropsOfAE;
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while (p0) {
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PredEntry *pe = RepPredProp(p0);
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if ( pe->KindOfPE == PEProp &&
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(pe->ModuleOfPred == cur_mod || !pe->ModuleOfPred)) {
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return(p0);
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}
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p0 = pe->NextOfPE;
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}
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return(NIL);
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}
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Prop
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_YAP_GetPredPropByAtom(Atom at, SMALLUNSGN cur_mod)
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/* get predicate entry for ap/arity; create it if neccessary. */
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{
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Prop p0;
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AtomEntry *ae = RepAtom(at);
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READ_LOCK(ae->ARWLock);
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p0 = GetPredPropByAtomHavingLock(ae, cur_mod);
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READ_UNLOCK(ae->ARWLock);
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return(p0);
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}
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static inline Prop
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GetPredPropByFuncHavingLock(Functor f, SMALLUNSGN cur_mod)
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/* get predicate entry for ap/arity; create it if neccessary. */
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{
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Prop p0;
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FunctorEntry *fe = (FunctorEntry *)f;
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p0 = fe->PropsOfFE;
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while (p0) {
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PredEntry *p = RepPredProp(p0);
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if (/* p->KindOfPE != 0 || only props */
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(p->ModuleOfPred == cur_mod || !(p->ModuleOfPred))) {
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return (p0);
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}
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p0 = p->NextOfPE;
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}
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return(NIL);
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}
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Prop
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_YAP_GetPredPropByFunc(Functor f, SMALLUNSGN cur_mod)
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/* get predicate entry for ap/arity; */
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{
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Prop p0;
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READ_LOCK(f->FRWLock);
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p0 = GetPredPropByFuncHavingLock(f, cur_mod);
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READ_UNLOCK(f->FRWLock);
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return (p0);
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}
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Prop
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_YAP_GetPredPropHavingLock(Atom ap, unsigned int arity, SMALLUNSGN mod)
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/* get predicate entry for ap/arity; */
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{
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Prop p0;
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AtomEntry *ae = RepAtom(ap);
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Functor f;
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if (arity == 0) {
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GetPredPropByAtomHavingLock(ae, mod);
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}
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f = InlinedUnlockedMkFunctor(ae, arity);
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READ_LOCK(f->FRWLock);
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p0 = GetPredPropByFuncHavingLock(f, mod);
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READ_UNLOCK(f->FRWLock);
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return (p0);
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}
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/* get expression entry for at/arity; */
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Prop
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_YAP_GetExpProp(Atom at, unsigned int arity)
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{
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Prop p0;
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AtomEntry *ae = RepAtom(at);
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ExpEntry *p;
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READ_LOCK(ae->ARWLock);
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p = RepExpProp(p0 = ae->PropsOfAE);
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while (p0 && (p->KindOfPE != ExpProperty || p->ArityOfEE != arity))
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p = RepExpProp(p0 = p->NextOfPE);
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READ_UNLOCK(ae->ARWLock);
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return (p0);
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}
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/* get expression entry for at/arity, at is already locked; */
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Prop
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_YAP_GetExpPropHavingLock(AtomEntry *ae, unsigned int arity)
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{
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Prop p0;
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ExpEntry *p;
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p = RepExpProp(p0 = ae->PropsOfAE);
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while (p0 && (p->KindOfPE != ExpProperty || p->ArityOfEE != arity))
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p = RepExpProp(p0 = p->NextOfPE);
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return (p0);
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}
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Prop
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_YAP_NewPredPropByFunctor(FunctorEntry *fe, SMALLUNSGN cur_mod)
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{
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Prop p0;
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PredEntry *p = (PredEntry *) _YAP_AllocAtomSpace(sizeof(*p));
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/* printf("entering %s:%s/%d\n", RepAtom(AtomOfTerm(ModuleName[cur_mod]))->StrOfAE, RepAtom(fe->NameOfFE)->StrOfAE, fe->ArityOfFE); */
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INIT_RWLOCK(p->PRWLock);
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p->KindOfPE = PEProp;
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p->ArityOfPE = fe->ArityOfFE;
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p->FirstClause = p->LastClause = NIL;
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p->PredFlags = 0L;
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p->StateOfPred = 0;
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p->OwnerFile = AtomNil;
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p->OpcodeOfPred = UNDEF_OPCODE;
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p->TrueCodeOfPred = p->CodeOfPred = (CODEADDR)(&(p->OpcodeOfPred));
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p->ModuleOfPred = cur_mod;
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p->NextPredOfModule = ModulePred[cur_mod];
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ModulePred[cur_mod] = p;
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INIT_LOCK(p->StatisticsForPred.lock);
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p->StatisticsForPred.NOfEntries = 0;
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p->StatisticsForPred.NOfHeadSuccesses = 0;
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p->StatisticsForPred.NOfRetries = 0;
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#ifdef TABLING
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p->TableOfPred = NULL;
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#endif /* TABLING */
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/* careful that they don't cross MkFunctor */
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p->NextOfPE = fe->PropsOfFE;
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fe->PropsOfFE = p0 = AbsPredProp(p);
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p->FunctorOfPred = (Functor)fe;
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WRITE_UNLOCK(fe->FRWLock);
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return (p0);
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}
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Prop
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_YAP_NewPredPropByAtom(AtomEntry *ae, SMALLUNSGN cur_mod)
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{
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Prop p0;
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PredEntry *p = (PredEntry *) _YAP_AllocAtomSpace(sizeof(*p));
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/* Printf("entering %s:%s/0\n", RepAtom(AtomOfTerm(ModuleName[cur_mod]))->StrOfAE, ae->StrOfAE); */
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INIT_RWLOCK(p->PRWLock);
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p->KindOfPE = PEProp;
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p->ArityOfPE = 0;
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p->FirstClause = p->LastClause = NIL;
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p->PredFlags = 0L;
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p->StateOfPred = 0;
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p->OwnerFile = AtomNil;
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p->OpcodeOfPred = UNDEF_OPCODE;
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p->TrueCodeOfPred = p->CodeOfPred = (CODEADDR)(&(p->OpcodeOfPred));
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p->ModuleOfPred = cur_mod;
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p->NextPredOfModule = ModulePred[cur_mod];
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ModulePred[cur_mod] = p;
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INIT_LOCK(p->StatisticsForPred.lock);
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p->StatisticsForPred.NOfEntries = 0;
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p->StatisticsForPred.NOfHeadSuccesses = 0;
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p->StatisticsForPred.NOfRetries = 0;
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#ifdef TABLING
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p->TableOfPred = NULL;
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#endif /* TABLING */
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/* careful that they don't cross MkFunctor */
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p->NextOfPE = ae->PropsOfAE;
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ae->PropsOfAE = p0 = AbsPredProp(p);
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p->FunctorOfPred = (Functor)AbsAtom(ae);
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WRITE_UNLOCK(ae->ARWLock);
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return (p0);
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}
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Term
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_YAP_GetValue(Atom a)
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{
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Prop p0 = GetAProp(a, ValProperty);
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Term out;
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if (p0 == NIL)
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return (TermNil);
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READ_LOCK(RepValProp(p0)->VRWLock);
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out = RepValProp(p0)->ValueOfVE;
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if (IsApplTerm(out)) {
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Functor f = FunctorOfTerm(out);
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if (f == FunctorDouble) {
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out = MkFloatTerm(FloatOfTerm(out));
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} else if (f == FunctorLongInt) {
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out = MkLongIntTerm(LongIntOfTerm(out));
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}
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#ifdef USE_GMP
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else {
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out = _YAP_MkBigIntTerm(_YAP_BigIntOfTerm(out));
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}
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#endif
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}
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READ_UNLOCK(RepValProp(p0)->VRWLock);
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return (out);
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}
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void
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_YAP_PutValue(Atom a, Term v)
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{
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AtomEntry *ae = RepAtom(a);
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Prop p0;
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ValEntry *p;
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Term t0;
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WRITE_LOCK(ae->ARWLock);
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p0 = GetAPropHavingLock(ae, ValProperty);
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if (p0 != NIL) {
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p = RepValProp(p0);
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WRITE_LOCK(p->VRWLock);
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WRITE_UNLOCK(ae->ARWLock);
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} else {
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p = (ValEntry *) _YAP_AllocAtomSpace(sizeof(ValEntry));
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p->NextOfPE = RepAtom(a)->PropsOfAE;
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RepAtom(a)->PropsOfAE = AbsValProp(p);
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p->KindOfPE = ValProperty;
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p->ValueOfVE = TermNil;
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/* take care that the lock for the property will be inited even
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if someone else searches for the property */
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INIT_RWLOCK(p->VRWLock);
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WRITE_LOCK(p->VRWLock);
|
|
WRITE_UNLOCK(ae->ARWLock);
|
|
}
|
|
t0 = p->ValueOfVE;
|
|
if (IsFloatTerm(v)) {
|
|
/* store a float in code space, so that we can access the property */
|
|
union {
|
|
Float f;
|
|
CELL ar[sizeof(Float) / sizeof(CELL)];
|
|
} un;
|
|
CELL *pt, *iptr;
|
|
unsigned int i;
|
|
|
|
un.f = FloatOfTerm(v);
|
|
if (IsFloatTerm(t0)) {
|
|
pt = RepAppl(t0);
|
|
} else {
|
|
if (IsApplTerm(t0)) {
|
|
_YAP_FreeCodeSpace((char *) (RepAppl(t0)));
|
|
}
|
|
pt = (CELL *) _YAP_AllocAtomSpace(sizeof(CELL)*(1 + 2*sizeof(Float)/sizeof(CELL)));
|
|
p->ValueOfVE = AbsAppl(pt);
|
|
pt[0] = (CELL)FunctorDouble;
|
|
}
|
|
|
|
iptr = pt+1;
|
|
for (i = 0; i < sizeof(Float) / sizeof(CELL); i++) {
|
|
*iptr++ = (CELL)un.ar[i];
|
|
}
|
|
} else if (IsLongIntTerm(v)) {
|
|
CELL *pt;
|
|
Int val = LongIntOfTerm(v);
|
|
|
|
if (IsLongIntTerm(t0)) {
|
|
pt = RepAppl(t0);
|
|
} else {
|
|
if (IsApplTerm(t0)) {
|
|
_YAP_FreeCodeSpace((char *) (RepAppl(t0)));
|
|
}
|
|
pt = (CELL *) _YAP_AllocAtomSpace(2*sizeof(CELL));
|
|
p->ValueOfVE = AbsAppl(pt);
|
|
pt[0] = (CELL)FunctorLongInt;
|
|
}
|
|
pt[1] = (CELL)val;
|
|
#ifdef USE_GMP
|
|
} else if (IsBigIntTerm(v)) {
|
|
CELL *ap = RepAppl(v);
|
|
Int sz =
|
|
sizeof(MP_INT)+sizeof(CELL)+
|
|
(((MP_INT *)(ap+1))->_mp_alloc*sizeof(mp_limb_t));
|
|
CELL *pt = (CELL *) _YAP_AllocAtomSpace(sz);
|
|
if (IsApplTerm(t0)) {
|
|
_YAP_FreeCodeSpace((char *) RepAppl(t0));
|
|
}
|
|
memcpy((void *)pt, (void *)ap, sz);
|
|
p->ValueOfVE = AbsAppl(pt);
|
|
#endif
|
|
} else {
|
|
if (IsApplTerm(t0)) {
|
|
/* recover space */
|
|
_YAP_FreeCodeSpace((char *) (RepAppl(p->ValueOfVE)));
|
|
}
|
|
p->ValueOfVE = v;
|
|
}
|
|
WRITE_UNLOCK(p->VRWLock);
|
|
}
|
|
|
|
Term
|
|
_YAP_StringToList(char *s)
|
|
{
|
|
register Term t;
|
|
register unsigned char *cp = (unsigned char *)s + strlen(s);
|
|
|
|
t = MkAtomTerm(AtomNil);
|
|
while (cp > (unsigned char *)s) {
|
|
t = MkPairTerm(MkIntTerm(*--cp), t);
|
|
}
|
|
return (t);
|
|
}
|
|
|
|
Term
|
|
_YAP_StringToListOfAtoms(char *s)
|
|
{
|
|
register Term t;
|
|
char so[2];
|
|
register unsigned char *cp = (unsigned char *)s + strlen(s);
|
|
|
|
so[1] = '\0';
|
|
t = MkAtomTerm(AtomNil);
|
|
while (cp > (unsigned char *)s) {
|
|
so[0] = *--cp;
|
|
t = MkPairTerm(MkAtomTerm(LookupAtom(so)), t);
|
|
}
|
|
return (t);
|
|
}
|
|
|
|
Term
|
|
_YAP_ArrayToList(register Term *tp, int nof)
|
|
{
|
|
register Term *pt = tp + nof;
|
|
register Term t;
|
|
|
|
t = MkAtomTerm(AtomNil);
|
|
while (pt > tp) {
|
|
Term tm = *--pt;
|
|
#if SBA
|
|
if (tm == 0)
|
|
t = MkPairTerm((CELL)pt, t);
|
|
else
|
|
#endif
|
|
t = MkPairTerm(tm, t);
|
|
}
|
|
return (t);
|
|
}
|
|
|
|
int
|
|
_YAP_GetName(char *s, UInt max, Term t)
|
|
{
|
|
register Term Head;
|
|
register Int i;
|
|
|
|
if (IsVarTerm(t) || !IsPairTerm(t))
|
|
return (FALSE);
|
|
while (IsPairTerm(t)) {
|
|
Head = HeadOfTerm(t);
|
|
if (!IsNumTerm(Head))
|
|
return (FALSE);
|
|
i = IntOfTerm(Head);
|
|
if (i < 0 || i > 255)
|
|
return (FALSE);
|
|
*s++ = i;
|
|
t = TailOfTerm(t);
|
|
if (--max == 0) {
|
|
_YAP_Error(FATAL_ERROR,t,"not enough space for GetName");
|
|
}
|
|
}
|
|
*s = '\0';
|
|
return (TRUE);
|
|
}
|
|
|
|
#ifdef SFUNC
|
|
|
|
Term
|
|
MkSFTerm(Functor f, int n, Term *a, empty_value)
|
|
{
|
|
Term t, p = AbsAppl(H);
|
|
int i;
|
|
|
|
*H++ = f;
|
|
RESET_VARIABLE(H);
|
|
++H;
|
|
for (i = 1; i <= n; ++i) {
|
|
t = Derefa(a++);
|
|
if (t != empty_value) {
|
|
*H++ = i;
|
|
*H++ = t;
|
|
}
|
|
}
|
|
*H++ = 0;
|
|
return (p);
|
|
}
|
|
|
|
CELL *
|
|
ArgsOfSFTerm(Term t)
|
|
{
|
|
CELL *p = RepAppl(t) + 1;
|
|
|
|
while (*p != (CELL) p)
|
|
p = CellPtr(*p) + 1;
|
|
return (p + 1);
|
|
}
|
|
|
|
#endif
|
|
|
|
long
|
|
_YAP_NewSlots(int n)
|
|
{
|
|
Int old_slots = IntOfTerm(ASP[0]), oldn = n;
|
|
while (n > 0) {
|
|
RESET_VARIABLE(ASP);
|
|
ASP--;
|
|
n--;
|
|
}
|
|
ASP[0] = MkIntTerm(old_slots+oldn);
|
|
return((ASP+1)-LCL0);
|
|
}
|
|
|
|
long
|
|
_YAP_InitSlot(Term t)
|
|
{
|
|
Int old_slots = IntOfTerm(ASP[0]);
|
|
*ASP = t;
|
|
ASP--;
|
|
ASP[0] = MkIntTerm(old_slots+1);
|
|
return((ASP+1)-LCL0);
|
|
}
|
|
|
|
void
|
|
_YAP_RecoverSlots(int n)
|
|
{
|
|
Int old_slots = IntOfTerm(ASP[0]);
|
|
ASP += n;
|
|
ASP[0] = MkIntTerm(old_slots-n);
|
|
}
|
|
|
|
Term
|
|
_YAP_GetFromSlot(long slot)
|
|
{
|
|
return(Deref(LCL0[slot]));
|
|
}
|
|
|
|
Term *
|
|
_YAP_AddressFromSlot(long slot)
|
|
{
|
|
return(LCL0+slot);
|
|
}
|
|
|
|
void
|
|
_YAP_PutInSlot(long slot, Term t)
|
|
{
|
|
LCL0[slot] = t;
|
|
}
|
|
|
|
|