1079 lines
25 KiB
C
1079 lines
25 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: attvar.c *
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* Last rev: *
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* mods: *
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* comments: YAP support for attributed vars *
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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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#include "Yap.h"
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#include "Yatom.h"
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#include "YapHeap.h"
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#include "heapgc.h"
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#include "attvar.h"
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#ifndef NULL
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#define NULL (void *)0
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#endif
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#ifdef COROUTINING
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#define TermVoidAtt TermFoundVar
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static CELL *
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AddToQueue(attvar_record *attv USES_REGS)
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{
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Term t[2];
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Term WGs, ng;
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t[0] = (CELL)&(attv->Done);
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t[1] = attv->Value;
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/* follow the chain */
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WGs = Yap_ReadTimedVar(LOCAL_WokenGoals);
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ng = Yap_MkApplTerm(FunctorAttGoal, 2, t);
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Yap_UpdateTimedVar(LOCAL_WokenGoals, MkPairTerm(ng, WGs));
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if ((Term)WGs == TermNil) {
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/* from now on, we have to start waking up goals */
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Yap_signal(YAP_WAKEUP_SIGNAL);
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}
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return(RepAppl(ng)+2);
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}
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static void
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AddFailToQueue( USES_REGS1 )
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{
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Term WGs;
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/* follow the chain */
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WGs = Yap_ReadTimedVar(LOCAL_WokenGoals);
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Yap_UpdateTimedVar(LOCAL_WokenGoals, MkPairTerm(MkAtomTerm(AtomFail), WGs));
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if ((Term)WGs == TermNil) {
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/* from now on, we have to start waking up goals */
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Yap_signal(YAP_WAKEUP_SIGNAL);
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}
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}
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static attvar_record *
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BuildNewAttVar( USES_REGS1 )
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{
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attvar_record *newv;
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/* add a new attributed variable */
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newv = (attvar_record *)H;
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H = (CELL *)(newv+1);
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newv->AttFunc = FunctorAttVar;
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RESET_VARIABLE(&(newv->Value));
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RESET_VARIABLE(&(newv->Done));
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RESET_VARIABLE(&(newv->Atts));
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return newv;
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}
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static int
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CopyAttVar(CELL *orig, struct cp_frame **to_visit_ptr, CELL *res USES_REGS)
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{
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register attvar_record *attv = RepAttVar(orig);
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register attvar_record *newv;
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struct cp_frame *to_visit = *to_visit_ptr;
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CELL *vt;
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if (!(newv = BuildNewAttVar( PASS_REGS1 )))
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return FALSE;
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vt = &(attv->Atts);
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to_visit->start_cp = vt-1;
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to_visit->end_cp = vt;
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if (IsVarTerm(attv->Atts)) {
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Bind_Global_NonAtt(&newv->Atts, (CELL)H);
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to_visit->to = H;
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H++;
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} else {
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to_visit->to = &(newv->Atts);
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}
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to_visit->oldv = vt[-1];
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to_visit->ground = FALSE;
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*to_visit_ptr = to_visit+1;
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*res = (CELL)&(newv->Done);
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return TRUE;
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}
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static Term
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AttVarToTerm(CELL *orig)
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{
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attvar_record *attv = RepAttVar(orig);
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return attv->Atts;
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}
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static int
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TermToAttVar(Term attvar, Term to USES_REGS)
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{
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attvar_record *attv = BuildNewAttVar( PASS_REGS1 );
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if (!attv)
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return FALSE;
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Bind_Global_NonAtt(&attv->Atts, attvar);
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*VarOfTerm(to) = AbsAttVar(attv);
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return TRUE;
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}
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static void
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WakeAttVar(CELL* pt1, CELL reg2 USES_REGS)
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{
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/* if bound to someone else, follow until we find the last one */
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attvar_record *attv = RepAttVar(pt1);
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CELL *myH = H;
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CELL *bind_ptr;
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if (IsVarTerm(Deref(attv->Atts))) {
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/* no attributes to wake */
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return;
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}
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if (IsVarTerm(reg2)) {
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if (pt1 == VarOfTerm(reg2))
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return;
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if (IsAttachedTerm(reg2)) {
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attvar_record *susp2 = RepAttVar(VarOfTerm(reg2));
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/* binding two suspended variables, be careful */
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if (susp2 >= attv) {
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if (!IsVarTerm(susp2->Value) || !IsUnboundVar(&susp2->Value)) {
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/* oops, our goal is on the queue to be woken */
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if (!Yap_unify(susp2->Value, (CELL)pt1)) {
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AddFailToQueue( PASS_REGS1 );
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}
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}
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Bind_Global_NonAtt(&(susp2->Value), (CELL)pt1);
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AddToQueue(susp2 PASS_REGS);
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return;
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}
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} else {
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Bind_NonAtt(VarOfTerm(reg2), (CELL)pt1);
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return;
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}
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}
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if (!IsVarTerm(attv->Value) || !IsUnboundVar(&attv->Value)) {
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/* oops, our goal is on the queue to be woken */
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if (!Yap_unify(attv->Value, reg2)) {
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AddFailToQueue( PASS_REGS1 );
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}
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return;
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}
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bind_ptr = AddToQueue(attv PASS_REGS);
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if (IsNonVarTerm(reg2)) {
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if (IsPairTerm(reg2) && RepPair(reg2) == myH)
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reg2 = AbsPair(H);
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else if (IsApplTerm(reg2) && RepAppl(reg2) == myH)
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reg2 = AbsAppl(H);
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}
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*bind_ptr = reg2;
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Bind_Global_NonAtt(&(attv->Value), reg2);
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}
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void
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Yap_WakeUp(CELL *pt0) {
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CACHE_REGS
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CELL d0 = *pt0;
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RESET_VARIABLE(pt0);
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WakeAttVar(pt0, d0 PASS_REGS);
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}
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static void
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mark_attvar(CELL *orig)
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{
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return;
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}
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static Term
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BuildAttTerm(Functor mfun, UInt ar USES_REGS)
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{
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CELL *h0 = H;
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UInt i;
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if (H+(1024+ar) > ASP) {
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LOCAL_Error_Size=ar*sizeof(CELL);
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return 0L;
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}
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H[0] = (CELL)mfun;
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RESET_VARIABLE(H+1);
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H += 2;
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for (i = 1; i< ar; i++) {
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*H = TermVoidAtt;
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H++;
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}
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return AbsAppl(h0);
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}
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static Term
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SearchAttsForModule(Term start, Functor mfun)
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{
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do {
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if (IsVarTerm(start) ||
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FunctorOfTerm(start) == mfun)
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return start;
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start = ArgOfTerm(1,start);
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} while (TRUE);
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}
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static Term
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SearchAttsForModuleName(Term start, Atom mname)
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{
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do {
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if (IsVarTerm(start) ||
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NameOfFunctor(FunctorOfTerm(start)) == mname)
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return start;
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start = ArgOfTerm(1,start);
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} while (TRUE);
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}
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static void
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AddNewModule(attvar_record *attv, Term t, int new, int do_it USES_REGS)
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{
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CELL *newp = RepAppl(t)+2;
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UInt i, ar = ArityOfFunctor((Functor)newp[-2]);
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for (i=1; i< ar; i++) {
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Term n = Deref(*newp);
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if (n == TermFreeTerm) {
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*newp = TermVoidAtt;
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} else {
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if (n != TermVoidAtt)
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do_it = TRUE;
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}
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newp++;
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}
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if (!do_it)
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return;
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if (new) {
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attv->Atts = t;
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} else if (IsVarTerm(attv->Atts)) {
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MaBind(&(attv->Atts),t);
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} else {
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Term *wherep = &attv->Atts;
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do {
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if (IsVarTerm(*wherep)) {
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Bind_Global_NonAtt(wherep,t);
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return;
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} else {
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wherep = RepAppl(Deref(*wherep))+1;
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}
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} while (TRUE);
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}
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}
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static void
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ReplaceAtts(attvar_record *attv, Term oatt, Term att USES_REGS)
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{
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UInt ar = ArityOfFunctor(FunctorOfTerm(oatt)), i;
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CELL *oldp = RepAppl(oatt)+1;
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CELL *newp;
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if (oldp > HB) {
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oldp++;
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newp = RepAppl(att)+2;
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/* if deterministic */
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for (i=1; i< ar; i++) {
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Term n = Deref(*newp);
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if (n != TermFreeTerm) {
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*oldp = n;
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}
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oldp++;
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newp++;
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}
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return;
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}
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newp = RepAppl(att)+1;
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*newp++ = *oldp++;
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for (i=1; i< ar; i++) {
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Term n = Deref(*newp);
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if (n == TermFreeTerm) {
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*newp = Deref(*oldp);
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}
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oldp++;
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newp++;
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}
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if (attv->Atts == oatt) {
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if (RepAppl(attv->Atts) >= HB)
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attv->Atts = att;
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else
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MaBind(&(attv->Atts), att);
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} else {
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Term *wherep = &attv->Atts;
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do {
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if (*wherep == oatt) {
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MaBind(wherep, att);
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return;
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} else {
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wherep = RepAppl(Deref(*wherep))+1;
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}
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} while (TRUE);
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}
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}
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static void
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DelAllAtts(attvar_record *attv USES_REGS)
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{
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MaBind(&(attv->Done), attv->Value);
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}
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static void
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DelAtts(attvar_record *attv, Term oatt USES_REGS)
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{
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Term t = ArgOfTerm(1,oatt);
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if (attv->Atts == oatt) {
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if (IsVarTerm(t)) {
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DelAllAtts(attv PASS_REGS);
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return;
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}
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if (RepAppl(attv->Atts) >= HB)
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attv->Atts = t;
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else
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MaBind(&(attv->Atts), t);
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} else {
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Term *wherep = &attv->Atts;
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do {
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if (*wherep == oatt) {
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MaBind(wherep, t);
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return;
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} else {
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wherep = RepAppl(Deref(*wherep))+1;
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}
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} while (TRUE);
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}
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}
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static void
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PutAtt(Int pos, Term atts, Term att USES_REGS)
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{
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if (IsVarTerm(att) && (CELL *)att > H && (CELL *)att < LCL0) {
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/* globalise locals */
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Term tnew = MkVarTerm();
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Bind_NonAtt((CELL *)att, tnew);
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att = tnew;
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}
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MaBind(RepAppl(atts)+pos, att);
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}
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static Int
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BindAttVar(attvar_record *attv USES_REGS) {
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if (IsVarTerm(attv->Done) && IsUnboundVar(&attv->Done)) {
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/* make sure we are not trying to bind a variable against itself */
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if (!IsVarTerm(attv->Value)) {
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Bind_Global_NonAtt(&(attv->Done), attv->Value);
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} else if (IsVarTerm(attv->Value)) {
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Term t = Deref(attv->Value);
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if (IsVarTerm(t)) {
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if (IsAttachedTerm(t)) {
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attvar_record *attv2 = RepAttVar(VarOfTerm(t));
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if (attv2 < attv) {
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Bind_Global_NonAtt(&(attv->Done), t);
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} else {
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Bind_Global_NonAtt(&(attv2->Done), AbsAttVar(attv));
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}
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} else {
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Yap_Error(SYSTEM_ERROR,(CELL)&(attv->Done),"attvar was bound when unset");
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return(FALSE);
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}
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} else {
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Bind_Global_NonAtt(&(attv->Done), t);
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}
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}
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return(TRUE);
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} else {
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Yap_Error(SYSTEM_ERROR,(CELL)&(attv->Done),"attvar was bound when set");
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return(FALSE);
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}
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}
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static Int
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UnBindAttVar(attvar_record *attv) {
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RESET_VARIABLE(&(attv->Value));
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return(TRUE);
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}
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static Term
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GetAllAtts(attvar_record *attv) {
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/* check if we are already there */
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return attv->Atts;
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}
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static Int
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p_put_att( USES_REGS1 ) {
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/* receive a variable in ARG1 */
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Term inp = Deref(ARG1);
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/* if this is unbound, ok */
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if (IsVarTerm(inp)) {
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attvar_record *attv;
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Atom modname = AtomOfTerm(Deref(ARG2));
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UInt ar = IntegerOfTerm(Deref(ARG3));
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Functor mfun;
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Term tatts;
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int new = FALSE;
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if (IsAttachedTerm(inp)) {
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attv = RepAttVar(VarOfTerm(inp));
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} else {
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while (!(attv = BuildNewAttVar( PASS_REGS1 ))) {
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LOCAL_Error_Size = sizeof(attvar_record);
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if (!Yap_gcl(LOCAL_Error_Size, 5, ENV, gc_P(P,CP))) {
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Yap_Error(OUT_OF_STACK_ERROR, TermNil, LOCAL_ErrorMessage);
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return FALSE;
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}
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inp = Deref(ARG1);
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}
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new = TRUE;
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}
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mfun= Yap_MkFunctor(modname,ar);
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if (IsVarTerm(tatts = SearchAttsForModule(attv->Atts,mfun))) {
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while (!(tatts = BuildAttTerm(mfun,ar PASS_REGS))) {
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if (!Yap_gcl(LOCAL_Error_Size, 5, ENV, gc_P(P,CP))) {
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Yap_Error(OUT_OF_STACK_ERROR, TermNil, LOCAL_ErrorMessage);
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return FALSE;
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}
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}
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Bind_NonAtt(VarOfTerm(Deref(ARG1)), AbsAttVar(attv));
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AddNewModule(attv, tatts, new, TRUE PASS_REGS);
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}
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PutAtt(IntegerOfTerm(Deref(ARG4)), tatts, Deref(ARG5) PASS_REGS);
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return TRUE;
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} else {
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Yap_Error(REPRESENTATION_ERROR_VARIABLE,inp,"first argument of put_attributes/2");
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return FALSE;
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}
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}
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static Int
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p_put_att_term( USES_REGS1 ) {
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/* receive a variable in ARG1 */
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Term inp = Deref(ARG1);
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/* if this is unbound, ok */
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if (IsVarTerm(inp)) {
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attvar_record *attv;
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if (IsAttachedTerm(inp)) {
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attv = RepAttVar(VarOfTerm(inp));
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MaBind(&(attv->Atts), Deref(ARG2));
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} else {
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while (!(attv = BuildNewAttVar( PASS_REGS1 ))) {
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LOCAL_Error_Size = sizeof(attvar_record);
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if (!Yap_gcl(LOCAL_Error_Size, 5, ENV, gc_P(P,CP))) {
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Yap_Error(OUT_OF_STACK_ERROR, TermNil, LOCAL_ErrorMessage);
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return FALSE;
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}
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inp = Deref(ARG1);
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}
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Bind_NonAtt(VarOfTerm(inp), AbsAttVar(attv));
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attv->Atts = Deref(ARG2);
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}
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return TRUE;
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} else {
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Yap_Error(REPRESENTATION_ERROR_VARIABLE,inp,"first argument of put_att_term/2");
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return(FALSE);
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}
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}
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static Int
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p_rm_att( USES_REGS1 ) {
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/* receive a variable in ARG1 */
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Term inp = Deref(ARG1);
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/* if this is unbound, ok */
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if (IsVarTerm(inp)) {
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attvar_record *attv;
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Atom modname = AtomOfTerm(Deref(ARG2));
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UInt ar = IntegerOfTerm(Deref(ARG3));
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Functor mfun;
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Term tatts;
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int new = FALSE;
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if (IsAttachedTerm(inp)) {
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attv = RepAttVar(VarOfTerm(inp));
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} else {
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while (!(attv = BuildNewAttVar( PASS_REGS1 ))) {
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LOCAL_Error_Size = sizeof(attvar_record);
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if (!Yap_gcl(LOCAL_Error_Size, 5, ENV, gc_P(P,CP))) {
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Yap_Error(OUT_OF_STACK_ERROR, TermNil, LOCAL_ErrorMessage);
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return FALSE;
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}
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inp = Deref(ARG1);
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}
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new = TRUE;
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Yap_unify(ARG1, AbsAttVar(attv));
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}
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mfun= Yap_MkFunctor(modname,ar);
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if (IsVarTerm(tatts = SearchAttsForModule(attv->Atts,mfun))) {
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while (!(tatts = BuildAttTerm(mfun, ar PASS_REGS))) {
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if (!Yap_gcl(LOCAL_Error_Size, 4, ENV, gc_P(P,CP))) {
|
|
Yap_Error(OUT_OF_STACK_ERROR, TermNil, LOCAL_ErrorMessage);
|
|
return FALSE;
|
|
}
|
|
}
|
|
AddNewModule(attv,tatts,new, FALSE PASS_REGS);
|
|
} else {
|
|
PutAtt(IntegerOfTerm(Deref(ARG4)), tatts, TermVoidAtt PASS_REGS);
|
|
}
|
|
return TRUE;
|
|
} else {
|
|
Yap_Error(REPRESENTATION_ERROR_VARIABLE,inp,"first argument of rm_att/2");
|
|
return(FALSE);
|
|
}
|
|
}
|
|
|
|
static Int
|
|
p_put_atts( USES_REGS1 ) {
|
|
/* receive a variable in ARG1 */
|
|
Term inp = Deref(ARG1);
|
|
|
|
/* if this is unbound, ok */
|
|
if (IsVarTerm(inp)) {
|
|
attvar_record *attv;
|
|
Term otatts;
|
|
Term tatts = Deref(ARG2);
|
|
Functor mfun = FunctorOfTerm(tatts);
|
|
int new = FALSE;
|
|
|
|
tatts = Deref(ARG2);
|
|
if (IsAttachedTerm(inp)) {
|
|
attv = RepAttVar(VarOfTerm(inp));
|
|
} else {
|
|
while (!(attv = BuildNewAttVar( PASS_REGS1 ))) {
|
|
LOCAL_Error_Size = sizeof(attvar_record);
|
|
if (!Yap_gcl(LOCAL_Error_Size, 2, ENV, gc_P(P,CP))) {
|
|
Yap_Error(OUT_OF_STACK_ERROR, TermNil, LOCAL_ErrorMessage);
|
|
return FALSE;
|
|
}
|
|
tatts = Deref(ARG2);
|
|
}
|
|
new = TRUE;
|
|
Yap_unify(ARG1, AbsAttVar(attv));
|
|
}
|
|
/* we may have a stack shift meanwhile!! */
|
|
tatts = Deref(ARG2);
|
|
if (IsVarTerm(tatts)) {
|
|
Yap_Error(INSTANTIATION_ERROR,tatts,"second argument of put_att/2");
|
|
return FALSE;
|
|
} else if (!IsApplTerm(tatts)) {
|
|
Yap_Error(TYPE_ERROR_COMPOUND,tatts,"second argument of put_att/2");
|
|
return FALSE;
|
|
}
|
|
if (IsVarTerm(otatts = SearchAttsForModule(attv->Atts,mfun))) {
|
|
AddNewModule(attv, tatts, new, FALSE PASS_REGS);
|
|
} else {
|
|
ReplaceAtts(attv, otatts, tatts PASS_REGS);
|
|
}
|
|
return TRUE;
|
|
} else {
|
|
Yap_Error(REPRESENTATION_ERROR_VARIABLE,inp,"first argument of put_att/2");
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
static Int
|
|
p_del_atts( USES_REGS1 ) {
|
|
/* receive a variable in ARG1 */
|
|
Term inp = Deref(ARG1);
|
|
Term otatts;
|
|
|
|
/* if this is unbound, ok */
|
|
if (IsVarTerm(inp)) {
|
|
attvar_record *attv;
|
|
Term tatts = Deref(ARG2);
|
|
Functor mfun = FunctorOfTerm(tatts);
|
|
|
|
if (IsAttachedTerm(inp)) {
|
|
attv = RepAttVar(VarOfTerm(inp));
|
|
} else {
|
|
return TRUE;
|
|
}
|
|
if (IsVarTerm(otatts = SearchAttsForModule(attv->Atts,mfun))) {
|
|
return TRUE;
|
|
} else {
|
|
DelAtts(attv, otatts PASS_REGS);
|
|
}
|
|
return TRUE;
|
|
} else {
|
|
return TRUE;
|
|
}
|
|
}
|
|
|
|
static Int
|
|
p_del_all_atts( USES_REGS1 ) {
|
|
/* receive a variable in ARG1 */
|
|
Term inp = Deref(ARG1);
|
|
|
|
/* if this is unbound, ok */
|
|
if (IsVarTerm(inp) && IsAttachedTerm(inp)) {
|
|
attvar_record *attv;
|
|
|
|
attv = RepAttVar(VarOfTerm(inp));
|
|
DelAllAtts(attv PASS_REGS);
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
static Int
|
|
p_get_att( USES_REGS1 ) {
|
|
/* receive a variable in ARG1 */
|
|
Term inp = Deref(ARG1);
|
|
/* if this is unbound, ok */
|
|
if (IsVarTerm(inp)) {
|
|
Atom modname = AtomOfTerm(Deref(ARG2));
|
|
|
|
if (IsAttachedTerm(inp)) {
|
|
attvar_record *attv;
|
|
Term tout, tatts;
|
|
|
|
attv = RepAttVar(VarOfTerm(inp));
|
|
if (IsVarTerm(tatts = SearchAttsForModuleName(attv->Atts,modname)))
|
|
return FALSE;
|
|
tout = ArgOfTerm(IntegerOfTerm(Deref(ARG3)),tatts);
|
|
if (tout == TermVoidAtt) return FALSE;
|
|
return Yap_unify(tout, ARG4);
|
|
} else {
|
|
/* Yap_Error(INSTANTIATION_ERROR,inp,"get_att/2"); */
|
|
return FALSE;
|
|
}
|
|
} else {
|
|
Yap_Error(REPRESENTATION_ERROR_VARIABLE,inp,"first argument of get_att/2");
|
|
return(FALSE);
|
|
}
|
|
}
|
|
|
|
static Int
|
|
p_free_att( USES_REGS1 ) {
|
|
/* receive a variable in ARG1 */
|
|
Term inp = Deref(ARG1);
|
|
/* if this is unbound, ok */
|
|
if (IsVarTerm(inp)) {
|
|
Atom modname = AtomOfTerm(Deref(ARG2));
|
|
|
|
if (IsAttachedTerm(inp)) {
|
|
attvar_record *attv;
|
|
Term tout, tatts;
|
|
|
|
attv = RepAttVar(VarOfTerm(inp));
|
|
if (IsVarTerm(tatts = SearchAttsForModuleName(attv->Atts,modname)))
|
|
return TRUE;
|
|
tout = ArgOfTerm(IntegerOfTerm(Deref(ARG3)),tatts);
|
|
return (tout == TermVoidAtt);
|
|
} else {
|
|
/* Yap_Error(INSTANTIATION_ERROR,inp,"get_att/2"); */
|
|
return TRUE;
|
|
}
|
|
} else {
|
|
Yap_Error(REPRESENTATION_ERROR_VARIABLE,inp,"first argument of free_att/2");
|
|
return(FALSE);
|
|
}
|
|
}
|
|
|
|
static Int
|
|
p_get_atts( USES_REGS1 ) {
|
|
/* receive a variable in ARG1 */
|
|
Term inp = Deref(ARG1);
|
|
/* if this is unbound, ok */
|
|
if (IsVarTerm(inp)) {
|
|
if (IsAttachedTerm(inp)) {
|
|
attvar_record *attv;
|
|
Term tatts;
|
|
Term access = Deref(ARG2);
|
|
Functor mfun = FunctorOfTerm(access);
|
|
UInt ar, i;
|
|
CELL *old, *new;
|
|
|
|
attv = RepAttVar(VarOfTerm(inp));
|
|
if (IsVarTerm(tatts = SearchAttsForModule(attv->Atts,mfun)))
|
|
return FALSE;
|
|
|
|
ar = ArityOfFunctor(mfun);
|
|
new = RepAppl(access)+2;
|
|
old = RepAppl(tatts)+2;
|
|
for (i = 1; i < ar; i++,new++,old++) {
|
|
if (*new != TermFreeTerm) {
|
|
if (*old == TermVoidAtt && *new != TermVoidAtt)
|
|
return FALSE;
|
|
if (*new == TermVoidAtt && *old != TermVoidAtt)
|
|
return FALSE;
|
|
if (!Yap_unify(*new,*old)) return FALSE;
|
|
}
|
|
}
|
|
return TRUE;
|
|
} else {
|
|
/* Yap_Error(INSTANTIATION_ERROR,inp,"get_att/2"); */
|
|
return FALSE;
|
|
}
|
|
} else {
|
|
return(FALSE);
|
|
}
|
|
}
|
|
|
|
static Int
|
|
p_has_atts( USES_REGS1 ) {
|
|
/* receive a variable in ARG1 */
|
|
Term inp = Deref(ARG1);
|
|
/* if this is unbound, ok */
|
|
if (IsVarTerm(inp)) {
|
|
if (IsAttachedTerm(inp)) {
|
|
attvar_record *attv;
|
|
Term tatts;
|
|
Term access = Deref(ARG2);
|
|
Functor mfun = FunctorOfTerm(access);
|
|
|
|
attv = RepAttVar(VarOfTerm(inp));
|
|
return !IsVarTerm(tatts = SearchAttsForModule(attv->Atts,mfun));
|
|
} else {
|
|
/* Yap_Error(INSTANTIATION_ERROR,inp,"get_att/2"); */
|
|
return FALSE;
|
|
}
|
|
} else {
|
|
Yap_Error(REPRESENTATION_ERROR_VARIABLE,inp,"first argument of has_atts/2");
|
|
return(FALSE);
|
|
}
|
|
}
|
|
|
|
static Int
|
|
p_bind_attvar( USES_REGS1 ) {
|
|
/* receive a variable in ARG1 */
|
|
Term inp = Deref(ARG1);
|
|
/* if this is unbound, ok */
|
|
if (IsVarTerm(inp)) {
|
|
if (IsAttachedTerm(inp)) {
|
|
attvar_record *attv = RepAttVar(VarOfTerm(inp));
|
|
return(BindAttVar(attv PASS_REGS));
|
|
}
|
|
return(TRUE);
|
|
} else {
|
|
Yap_Error(REPRESENTATION_ERROR_VARIABLE,inp,"first argument of bind_attvar/2");
|
|
return(FALSE);
|
|
}
|
|
}
|
|
|
|
static Int
|
|
p_unbind_attvar( USES_REGS1 ) {
|
|
/* receive a variable in ARG1 */
|
|
Term inp = Deref(ARG1);
|
|
/* if this is unbound, ok */
|
|
if (IsVarTerm(inp)) {
|
|
if (IsAttachedTerm(inp)) {
|
|
attvar_record *attv = RepAttVar(VarOfTerm(inp));
|
|
return(UnBindAttVar(attv));
|
|
}
|
|
return(TRUE);
|
|
} else {
|
|
Yap_Error(REPRESENTATION_ERROR_VARIABLE,inp,"first argument of bind_attvar/2");
|
|
return(FALSE);
|
|
}
|
|
}
|
|
|
|
static Int
|
|
p_get_all_atts( USES_REGS1 ) {
|
|
/* receive a variable in ARG1 */
|
|
Term inp = Deref(ARG1);
|
|
/* if this is unbound, ok */
|
|
if (IsVarTerm(inp)) {
|
|
if (IsAttachedTerm(inp)) {
|
|
attvar_record *attv = RepAttVar(VarOfTerm(inp));
|
|
return Yap_unify(ARG2,GetAllAtts(attv));
|
|
}
|
|
return TRUE;
|
|
} else {
|
|
Yap_Error(REPRESENTATION_ERROR_VARIABLE,inp,"first argument of get_all_atts/2");
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
static int
|
|
ActiveAtt(Term tatt, UInt ar)
|
|
{
|
|
CELL *cp = RepAppl(tatt)+1;
|
|
UInt i;
|
|
|
|
for (i = 1; i < ar; i++) {
|
|
if (cp[i] != TermVoidAtt)
|
|
return TRUE;
|
|
}
|
|
return FALSE;
|
|
}
|
|
|
|
static Int
|
|
p_modules_with_atts( USES_REGS1 ) {
|
|
/* receive a variable in ARG1 */
|
|
Term inp = Deref(ARG1);
|
|
/* if this is unbound, ok */
|
|
if (IsVarTerm(inp)) {
|
|
if (IsAttachedTerm(inp)) {
|
|
attvar_record *attv = RepAttVar(VarOfTerm(inp));
|
|
CELL *h0 = H;
|
|
Term tatt;
|
|
|
|
if (IsVarTerm(tatt = attv->Atts))
|
|
return Yap_unify(ARG2,TermNil);
|
|
while (!IsVarTerm(tatt)) {
|
|
Functor f = FunctorOfTerm(tatt);
|
|
if (H != h0)
|
|
H[-1] = AbsPair(H);
|
|
if (ActiveAtt(tatt, ArityOfFunctor(f))) {
|
|
*H = MkAtomTerm(NameOfFunctor(f));
|
|
H+=2;
|
|
}
|
|
tatt = ArgOfTerm(1,tatt);
|
|
}
|
|
if (h0 != H) {
|
|
H[-1] = TermNil;
|
|
return Yap_unify(ARG2,AbsPair(h0));
|
|
}
|
|
}
|
|
return Yap_unify(ARG2,TermNil);
|
|
} else {
|
|
Yap_Error(REPRESENTATION_ERROR_VARIABLE,inp,"first argument of modules_with_attributes/2");
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
static Int
|
|
p_swi_all_atts( USES_REGS1 ) {
|
|
/* receive a variable in ARG1 */
|
|
Term inp = Deref(ARG1);
|
|
Functor attf = FunctorAtt1;
|
|
|
|
/* if this is unbound, ok */
|
|
if (IsVarTerm(inp)) {
|
|
if (IsAttachedTerm(inp)) {
|
|
attvar_record *attv = RepAttVar(VarOfTerm(inp));
|
|
CELL *h0 = H;
|
|
Term tatt;
|
|
|
|
if (IsVarTerm(tatt = attv->Atts))
|
|
return Yap_unify(ARG2,TermNil);
|
|
while (!IsVarTerm(tatt)) {
|
|
Functor f = FunctorOfTerm(tatt);
|
|
UInt ar = ArityOfFunctor(f);
|
|
|
|
if (H != h0)
|
|
H[-1] = AbsAppl(H);
|
|
H[0] = (CELL) attf;
|
|
H[1] = MkAtomTerm(NameOfFunctor(f));
|
|
/* SWI */
|
|
if (ar == 2)
|
|
H[2] = ArgOfTerm(2,tatt);
|
|
else
|
|
H[2] = tatt;
|
|
H += 4;
|
|
H[-1] = AbsAppl(H);
|
|
tatt = ArgOfTerm(1,tatt);
|
|
}
|
|
if (h0 != H) {
|
|
H[-1] = TermNil;
|
|
return Yap_unify(ARG2,AbsAppl(h0));
|
|
}
|
|
}
|
|
return Yap_unify(ARG2,TermNil);
|
|
} else {
|
|
Yap_Error(REPRESENTATION_ERROR_VARIABLE,inp,"first argument of get_all_swi_atts/2");
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
|
|
static Term
|
|
AllAttVars( USES_REGS1 ) {
|
|
CELL *pt = H0;
|
|
CELL *myH = H;
|
|
|
|
while (pt < H) {
|
|
switch(*pt) {
|
|
case (CELL)FunctorAttVar:
|
|
if (IsUnboundVar(pt+1)) {
|
|
if (ASP - myH < 1024) {
|
|
LOCAL_Error_Size = (ASP-H)*sizeof(CELL);
|
|
return 0L;
|
|
}
|
|
if (myH != H) {
|
|
myH[-1] = AbsPair(myH);
|
|
}
|
|
myH[0] = AbsAttVar((attvar_record *)pt);
|
|
myH += 2;
|
|
}
|
|
pt += (1+ATT_RECORD_ARITY);
|
|
break;
|
|
case (CELL)FunctorDouble:
|
|
#if SIZEOF_DOUBLE == 2*SIZEOF_LONG_INT
|
|
pt += 4;
|
|
#else
|
|
pt += 3;
|
|
#endif
|
|
break;
|
|
case (CELL)FunctorBigInt:
|
|
{
|
|
Int sz = 3 +
|
|
(sizeof(MP_INT)+
|
|
(((MP_INT *)(pt+2))->_mp_alloc*sizeof(mp_limb_t)))/sizeof(CELL);
|
|
pt += sz;
|
|
}
|
|
break;
|
|
case (CELL)FunctorLongInt:
|
|
pt += 3;
|
|
break;
|
|
default:
|
|
pt++;
|
|
}
|
|
}
|
|
if (myH != H) {
|
|
Term out = AbsPair(H);
|
|
myH[-1] = TermNil;
|
|
H = myH;
|
|
return out;
|
|
} else {
|
|
return TermNil;
|
|
}
|
|
}
|
|
|
|
static Int
|
|
p_all_attvars( USES_REGS1 )
|
|
{
|
|
do {
|
|
Term out;
|
|
|
|
if (!(out = AllAttVars( PASS_REGS1 ))) {
|
|
if (!Yap_gcl(LOCAL_Error_Size, 1, ENV, gc_P(P,CP))) {
|
|
Yap_Error(OUT_OF_STACK_ERROR, TermNil, LOCAL_ErrorMessage);
|
|
return FALSE;
|
|
}
|
|
} else {
|
|
return Yap_unify(ARG1,out);
|
|
}
|
|
} while (TRUE);
|
|
}
|
|
|
|
static Int
|
|
p_is_attvar( USES_REGS1 )
|
|
{
|
|
Term t = Deref(ARG1);
|
|
return(IsVarTerm(t) &&
|
|
IsAttVar(VarOfTerm(t)));
|
|
}
|
|
|
|
/* check if we are not redoing effort */
|
|
static Int
|
|
p_attvar_bound( USES_REGS1 )
|
|
{
|
|
Term t = Deref(ARG1);
|
|
return
|
|
IsVarTerm(t) &&
|
|
IsAttachedTerm(t) &&
|
|
!IsUnboundVar(&(RepAttVar(VarOfTerm(t))->Done));
|
|
}
|
|
|
|
static Int
|
|
p_void_term( USES_REGS1 )
|
|
{
|
|
return Yap_unify(ARG1,TermVoidAtt);
|
|
}
|
|
|
|
static Int
|
|
p_free_term( USES_REGS1 )
|
|
{
|
|
return Yap_unify(ARG1,TermFreeTerm);
|
|
}
|
|
|
|
static Int
|
|
p_fast_unify( USES_REGS1 )
|
|
{
|
|
/*
|
|
Case we want to unify two variables, but we do not
|
|
think there is a point in waking them up
|
|
*/
|
|
Term t1, t2;
|
|
CELL *a, *b;
|
|
if (!IsVarTerm(t1 = Deref(ARG1)))
|
|
return FALSE;
|
|
if (!IsVarTerm(t2 = Deref(ARG2)))
|
|
return FALSE;
|
|
a = VarOfTerm(t1);
|
|
b = VarOfTerm(t2);
|
|
if(a > b) {
|
|
Bind_Global_NonAtt(a,t2);
|
|
} else if((a) < (b)){
|
|
Bind_Global_NonAtt(b,t1);
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
#else
|
|
|
|
static Int
|
|
p_all_attvars( USES_REGS1 )
|
|
{
|
|
return FALSE;
|
|
}
|
|
|
|
static Int
|
|
p_is_attvar( USES_REGS1 )
|
|
{
|
|
return FALSE;
|
|
}
|
|
|
|
static Int
|
|
p_attvar_bound( USES_REGS1 )
|
|
{
|
|
return FALSE;
|
|
}
|
|
|
|
#endif /* COROUTINING */
|
|
|
|
void Yap_InitAttVarPreds(void)
|
|
{
|
|
CACHE_REGS
|
|
Term OldCurrentModule = CurrentModule;
|
|
CurrentModule = ATTRIBUTES_MODULE;
|
|
#ifdef COROUTINING
|
|
GLOBAL_attas[attvars_ext].bind_op = WakeAttVar;
|
|
GLOBAL_attas[attvars_ext].copy_term_op = CopyAttVar;
|
|
GLOBAL_attas[attvars_ext].to_term_op = AttVarToTerm;
|
|
GLOBAL_attas[attvars_ext].term_to_op = TermToAttVar;
|
|
GLOBAL_attas[attvars_ext].mark_op = mark_attvar;
|
|
Yap_InitCPred("get_att", 4, p_get_att, SafePredFlag);
|
|
Yap_InitCPred("get_module_atts", 2, p_get_atts, SafePredFlag);
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Yap_InitCPred("has_module_atts", 2, p_has_atts, SafePredFlag);
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Yap_InitCPred("get_all_atts", 2, p_get_all_atts, SafePredFlag);
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Yap_InitCPred("get_all_swi_atts", 2, p_swi_all_atts, SafePredFlag);
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Yap_InitCPred("free_att", 3, p_free_att, SafePredFlag);
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Yap_InitCPred("put_att", 5, p_put_att, 0);
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Yap_InitCPred("put_att_term", 2, p_put_att_term, 0);
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Yap_InitCPred("put_module_atts", 2, p_put_atts, 0);
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Yap_InitCPred("del_all_module_atts", 2, p_del_atts, 0);
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Yap_InitCPred("del_all_atts", 1, p_del_all_atts, 0);
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Yap_InitCPred("rm_att", 4, p_rm_att, 0);
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Yap_InitCPred("bind_attvar", 1, p_bind_attvar, SafePredFlag);
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Yap_InitCPred("unbind_attvar", 1, p_unbind_attvar, SafePredFlag);
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Yap_InitCPred("modules_with_attributes", 2, p_modules_with_atts, SafePredFlag);
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Yap_InitCPred("void_term", 1, p_void_term, SafePredFlag);
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Yap_InitCPred("free_term", 1, p_free_term, SafePredFlag);
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Yap_InitCPred("fast_unify_attributed", 2, p_fast_unify, 0);
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#endif /* COROUTINING */
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Yap_InitCPred("all_attvars", 1, p_all_attvars, 0);
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CurrentModule = OldCurrentModule;
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Yap_InitCPred("attvar", 1, p_is_attvar, SafePredFlag|TestPredFlag);
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Yap_InitCPred("$att_bound", 1, p_attvar_bound, SafePredFlag|TestPredFlag|HiddenPredFlag);
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}
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