9bb854ab62
git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1870 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
974 lines
22 KiB
C
974 lines
22 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 "Heap.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)
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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(WokenGoals);
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ng = Yap_MkApplTerm(FunctorAttGoal, 2, t);
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Yap_UpdateTimedVar(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(void)
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{
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Term WGs;
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/* follow the chain */
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WGs = Yap_ReadTimedVar(WokenGoals);
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Yap_UpdateTimedVar(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 int
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CopyAttVar(CELL *orig, CELL ***to_visit_ptr, CELL *res)
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{
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register attvar_record *attv = (attvar_record *)orig;
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register attvar_record *newv;
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CELL **to_visit = *to_visit_ptr;
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CELL *vt;
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/* add a new attributed variable */
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newv = DelayTop();
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if ((ADDR)newv - Yap_GlobalBase < 1024*sizeof(CELL))
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return FALSE;
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newv--;
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RESET_VARIABLE(&(newv->Value));
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RESET_VARIABLE(&(newv->Done));
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vt = &(attv->Atts);
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to_visit[0] = vt-1;
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to_visit[1] = vt;
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if (IsVarTerm(attv->Atts)) {
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newv->Atts = (CELL)H;
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to_visit[2] = H;
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H++;
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} else {
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to_visit[2] = &(newv->Atts);
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}
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to_visit[3] = (CELL *)vt[-1];
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*to_visit_ptr = to_visit+4;
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*res = (CELL)&(newv->Done);
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SetDelayTop(newv);
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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 = (attvar_record *)orig;
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return attv->Atts;
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}
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static attvar_record *
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BuildNewAttVar(void)
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{
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attvar_record *attv = DelayTop();
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if ((ADDR)attv - Yap_GlobalBase < 1024*sizeof(CELL))
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return FALSE;
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attv--;
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RESET_VARIABLE(&(attv->Done));
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RESET_VARIABLE(&(attv->Value));
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RESET_VARIABLE(&(attv->Atts));
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SetDelayTop(attv);
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return attv;
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}
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static int
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TermToAttVar(Term attvar, Term to)
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{
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attvar_record *attv = BuildNewAttVar();
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if (!attv)
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return FALSE;
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attv->Atts = attvar;
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*VarOfTerm(to) = (CELL)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)
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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 = (attvar_record *)pt1;
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CELL *myH = H;
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CELL *bind_ptr;
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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 = (attvar_record *)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();
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}
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}
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Bind_Global(&(susp2->Value), (CELL)pt1);
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AddToQueue(susp2);
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return;
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}
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} else {
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Bind(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();
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}
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return;
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}
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bind_ptr = AddToQueue(attv);
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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(&(attv->Value), reg2);
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}
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void
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Yap_WakeUp(CELL *pt0) {
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CELL d0 = *pt0;
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RESET_VARIABLE(pt0);
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TR--;
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WakeAttVar(pt0, d0);
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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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register attvar_record *attv = (attvar_record *)orig;
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Yap_mark_external_reference(&(attv->Value));
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Yap_mark_external_reference(&(attv->Done));
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Yap_mark_external_reference(&(attv->Atts));
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}
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static Term
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BuildAttTerm(Functor mfun, UInt ar)
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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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Yap_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)
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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 (IsVarTerm(attv->Atts)) {
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if (new) {
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attv->Atts = t;
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} else {
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Bind(&(attv->Atts),t);
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}
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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(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)
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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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DelAtts(attvar_record *attv, Term oatt)
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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 = ArgOfTerm(1,oatt);
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else
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MaBind(&(attv->Atts), ArgOfTerm(1,oatt));
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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, ArgOfTerm(1,oatt));
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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)
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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((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) {
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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(&(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 = (attvar_record *)VarOfTerm(t);
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if (attv2 < attv) {
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Bind_Global(&(attv->Done), t);
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} else {
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Bind_Global(&(attv2->Done), (CELL)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(&(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 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 Term
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AllAttVars(attvar_record *attv) {
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CELL *h0 = H;
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attvar_record *max = DelayTop();
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while (--attv >= max) {
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if (ASP - H < 1024) {
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H = h0;
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Yap_Error_Size = (ASP-H)*sizeof(CELL);
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return 0L;
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}
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if (IsVarTerm(attv->Done) && IsUnboundVar(&attv->Done)) {
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if (IsVarTerm(attv->Atts) && VarOfTerm(attv->Atts) < (CELL *)attv) {
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/* skip call residue(s) */
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attv = (attvar_record *)(attv->Atts);
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} else {
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if (H != h0) {
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H[-1] = AbsPair(H);
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}
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H[0] = (CELL)attv;
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H += 2;
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}
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}
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}
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if (H != h0) {
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H[-1] = TermNil;
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return AbsPair(h0);
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} else {
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return TermNil;
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}
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}
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static Int
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p_put_att(void) {
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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 = (attvar_record *)VarOfTerm(inp);
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} else {
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while (!(attv = BuildNewAttVar())) {
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if (!Yap_growglobal(NULL)) {
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Yap_Error(OUT_OF_ATTVARS_ERROR, ARG1, Yap_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))) {
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if (!Yap_gcl(Yap_Error_Size, 5, ENV, P)) {
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Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage);
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return FALSE;
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}
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}
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Yap_unify(ARG1, (Term)attv);
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AddNewModule(attv,tatts,new,TRUE);
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}
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PutAtt(IntegerOfTerm(Deref(ARG4)), tatts, Deref(ARG5));
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return TRUE;
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} else {
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Yap_Error(TYPE_ERROR_VARIABLE,inp,"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(void) {
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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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int new = FALSE;
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if (IsAttachedTerm(inp)) {
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attv = (attvar_record *)VarOfTerm(inp);
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} else {
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while (!(attv = BuildNewAttVar())) {
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if (!Yap_growglobal(NULL)) {
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Yap_Error(OUT_OF_ATTVARS_ERROR, ARG1, Yap_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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if (new) {
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attv->Atts = Deref(ARG2);
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} else {
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MaBind(&(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(TYPE_ERROR_VARIABLE,inp,"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_rm_att(void) {
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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 = (attvar_record *)VarOfTerm(inp);
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} else {
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while (!(attv = BuildNewAttVar())) {
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if (!Yap_growglobal(NULL)) {
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Yap_Error(OUT_OF_ATTVARS_ERROR, ARG1, Yap_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;
|
|
Yap_unify(ARG1, (Term)attv);
|
|
}
|
|
mfun= Yap_MkFunctor(modname,ar);
|
|
if (IsVarTerm(tatts = SearchAttsForModule(attv->Atts,mfun))) {
|
|
while (!(tatts = BuildAttTerm(mfun,ar))) {
|
|
if (!Yap_gcl(Yap_Error_Size, 4, ENV, P)) {
|
|
Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage);
|
|
return FALSE;
|
|
}
|
|
}
|
|
AddNewModule(attv,tatts,new, FALSE);
|
|
} else {
|
|
PutAtt(IntegerOfTerm(Deref(ARG4)), tatts, TermVoidAtt);
|
|
}
|
|
return TRUE;
|
|
} else {
|
|
Yap_Error(TYPE_ERROR_VARIABLE,inp,"put_attributes/2");
|
|
return(FALSE);
|
|
}
|
|
}
|
|
|
|
static Int
|
|
p_put_atts(void) {
|
|
/* 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);
|
|
int new = FALSE;
|
|
|
|
if (IsAttachedTerm(inp)) {
|
|
attv = (attvar_record *)VarOfTerm(inp);
|
|
} else {
|
|
while (!(attv = BuildNewAttVar())) {
|
|
if (!Yap_growglobal(NULL)) {
|
|
Yap_Error(OUT_OF_ATTVARS_ERROR, ARG1, Yap_ErrorMessage);
|
|
return FALSE;
|
|
}
|
|
tatts = Deref(ARG2);
|
|
}
|
|
new = TRUE;
|
|
Yap_unify(ARG1, (Term)attv);
|
|
}
|
|
if (IsVarTerm(otatts = SearchAttsForModule(attv->Atts,mfun))) {
|
|
AddNewModule(attv,tatts,new,FALSE);
|
|
} else {
|
|
ReplaceAtts(attv, otatts, tatts);
|
|
}
|
|
return TRUE;
|
|
} else {
|
|
Yap_Error(TYPE_ERROR_VARIABLE,inp,"put_attributes/2");
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
static Int
|
|
p_del_atts(void) {
|
|
/* 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 = (attvar_record *)VarOfTerm(inp);
|
|
} else {
|
|
return TRUE;
|
|
}
|
|
if (IsVarTerm(otatts = SearchAttsForModule(attv->Atts,mfun))) {
|
|
return TRUE;
|
|
} else {
|
|
DelAtts(attv, otatts);
|
|
}
|
|
return TRUE;
|
|
} else {
|
|
return TRUE;
|
|
}
|
|
}
|
|
|
|
static Int
|
|
p_get_att(void) {
|
|
/* 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 = (attvar_record *)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(TYPE_ERROR_VARIABLE,inp,"put_attributes/2");
|
|
return(FALSE);
|
|
}
|
|
}
|
|
|
|
static Int
|
|
p_free_att(void) {
|
|
/* 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 = (attvar_record *)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(TYPE_ERROR_VARIABLE,inp,"put_attributes/2");
|
|
return(FALSE);
|
|
}
|
|
}
|
|
|
|
static Int
|
|
p_get_atts(void) {
|
|
/* 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 = (attvar_record *)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 {
|
|
// Yap_Error(TYPE_ERROR_VARIABLE,inp,"get_attributes/2");
|
|
return(FALSE);
|
|
}
|
|
}
|
|
|
|
static Int
|
|
p_has_atts(void) {
|
|
/* 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 = (attvar_record *)VarOfTerm(inp);
|
|
return !IsVarTerm(tatts = SearchAttsForModule(attv->Atts,mfun));
|
|
} else {
|
|
/* Yap_Error(INSTANTIATION_ERROR,inp,"get_att/2"); */
|
|
return FALSE;
|
|
}
|
|
} else {
|
|
Yap_Error(TYPE_ERROR_VARIABLE,inp,"has_attributes/2");
|
|
return(FALSE);
|
|
}
|
|
}
|
|
|
|
static Int
|
|
p_bind_attvar(void) {
|
|
/* receive a variable in ARG1 */
|
|
Term inp = Deref(ARG1);
|
|
/* if this is unbound, ok */
|
|
if (IsVarTerm(inp)) {
|
|
if (IsAttachedTerm(inp)) {
|
|
attvar_record *attv = (attvar_record *)VarOfTerm(inp);
|
|
return(BindAttVar(attv));
|
|
}
|
|
return(TRUE);
|
|
} else {
|
|
Yap_Error(TYPE_ERROR_VARIABLE,inp,"bind_att/2");
|
|
return(FALSE);
|
|
}
|
|
}
|
|
|
|
static Int
|
|
p_get_all_atts(void) {
|
|
/* receive a variable in ARG1 */
|
|
Term inp = Deref(ARG1);
|
|
/* if this is unbound, ok */
|
|
if (IsVarTerm(inp)) {
|
|
if (IsAttachedTerm(inp)) {
|
|
attvar_record *attv = (attvar_record *)VarOfTerm(inp);
|
|
return Yap_unify(ARG2,GetAllAtts(attv));
|
|
}
|
|
return TRUE;
|
|
} else {
|
|
Yap_Error(TYPE_ERROR_VARIABLE,inp,"get_att/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(void) {
|
|
/* receive a variable in ARG1 */
|
|
Term inp = Deref(ARG1);
|
|
/* if this is unbound, ok */
|
|
if (IsVarTerm(inp)) {
|
|
if (IsAttachedTerm(inp)) {
|
|
attvar_record *attv = (attvar_record *)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(TYPE_ERROR_VARIABLE,inp,"get_att/2");
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
static Int
|
|
p_swi_all_atts(void) {
|
|
/* receive a variable in ARG1 */
|
|
Term inp = Deref(ARG1);
|
|
Functor attf = Yap_MkFunctor(Yap_LookupAtom("att"),3);
|
|
|
|
/* if this is unbound, ok */
|
|
if (IsVarTerm(inp)) {
|
|
if (IsAttachedTerm(inp)) {
|
|
attvar_record *attv = (attvar_record *)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 (ArityOfFunctor(f) == 2) {
|
|
if (H != h0)
|
|
H[-1] = AbsAppl(H);
|
|
H[0] = (CELL) attf;
|
|
H[1] = MkAtomTerm(NameOfFunctor(f));
|
|
H[2] = ArgOfTerm(2,tatt);
|
|
H+=4;
|
|
}
|
|
tatt = ArgOfTerm(1,tatt);
|
|
}
|
|
if (h0 != H) {
|
|
H[-1] = TermNil;
|
|
return Yap_unify(ARG2,AbsAppl(h0));
|
|
}
|
|
}
|
|
return Yap_unify(ARG2,TermNil);
|
|
} else {
|
|
Yap_Error(TYPE_ERROR_VARIABLE,inp,"get_att/2");
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
static Int
|
|
p_all_attvars(void)
|
|
{
|
|
do {
|
|
Term out;
|
|
attvar_record *base;
|
|
|
|
base = (attvar_record *)Yap_ReadTimedVar(AttsMutableList);
|
|
if (!(out = AllAttVars(base))) {
|
|
if (!Yap_gcl(Yap_Error_Size, 1, ENV, P)) {
|
|
Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage);
|
|
return FALSE;
|
|
}
|
|
} else {
|
|
return Yap_unify(ARG1,out);
|
|
}
|
|
} while (TRUE);
|
|
}
|
|
|
|
static Int
|
|
p_is_attvar(void)
|
|
{
|
|
Term t = Deref(ARG1);
|
|
return(IsVarTerm(t) &&
|
|
IsAttachedTerm(t));
|
|
}
|
|
|
|
/* check if we are not redoing effort */
|
|
static Int
|
|
p_attvar_bound(void)
|
|
{
|
|
Term t = Deref(ARG1);
|
|
return(IsVarTerm(t) &&
|
|
IsAttachedTerm(t) &&
|
|
!IsUnboundVar(&((attvar_record *)VarOfTerm(t))->Done));
|
|
}
|
|
|
|
static Int
|
|
p_void_term(void)
|
|
{
|
|
return Yap_unify(ARG1,TermVoidAtt);
|
|
}
|
|
|
|
static Int
|
|
p_free_term(void)
|
|
{
|
|
return Yap_unify(ARG1,TermFreeTerm);
|
|
}
|
|
|
|
#else
|
|
|
|
static Int
|
|
p_all_attvars(void)
|
|
{
|
|
return FALSE;
|
|
}
|
|
|
|
static Int
|
|
p_is_attvar(void)
|
|
{
|
|
return FALSE;
|
|
}
|
|
|
|
static Int
|
|
p_attvar_bound(void)
|
|
{
|
|
return FALSE;
|
|
}
|
|
|
|
#endif /* COROUTINING */
|
|
|
|
void Yap_InitAttVarPreds(void)
|
|
{
|
|
Term OldCurrentModule = CurrentModule;
|
|
CurrentModule = ATTRIBUTES_MODULE;
|
|
#ifdef COROUTINING
|
|
attas[attvars_ext].bind_op = WakeAttVar;
|
|
attas[attvars_ext].copy_term_op = CopyAttVar;
|
|
attas[attvars_ext].to_term_op = AttVarToTerm;
|
|
attas[attvars_ext].term_to_op = TermToAttVar;
|
|
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);
|
|
Yap_InitCPred("has_module_atts", 2, p_has_atts, SafePredFlag);
|
|
Yap_InitCPred("get_all_atts", 2, p_get_all_atts, SafePredFlag);
|
|
Yap_InitCPred("get_all_swi_atts", 2, p_swi_all_atts, SafePredFlag);
|
|
Yap_InitCPred("free_att", 3, p_free_att, SafePredFlag);
|
|
Yap_InitCPred("put_att", 5, p_put_att, 0);
|
|
Yap_InitCPred("put_att_term", 5, p_put_att_term, 0);
|
|
Yap_InitCPred("put_module_atts", 2, p_put_atts, 0);
|
|
Yap_InitCPred("del_all_module_atts", 2, p_del_atts, 0);
|
|
Yap_InitCPred("rm_att", 4, p_rm_att, 0);
|
|
Yap_InitCPred("bind_attvar", 1, p_bind_attvar, SafePredFlag);
|
|
Yap_InitCPred("modules_with_attributes", 2, p_modules_with_atts, SafePredFlag);
|
|
Yap_InitCPred("void_term", 1, p_void_term, SafePredFlag);
|
|
Yap_InitCPred("free_term", 1, p_free_term, SafePredFlag);
|
|
#endif /* COROUTINING */
|
|
Yap_InitCPred("all_attvars", 1, p_all_attvars, 0);
|
|
CurrentModule = OldCurrentModule;
|
|
Yap_InitCPred("attvar", 1, p_is_attvar, SafePredFlag|TestPredFlag);
|
|
Yap_InitCPred("$att_bound", 1, p_attvar_bound, SafePredFlag|TestPredFlag|HiddenPredFlag);
|
|
}
|
|
|
|
|
|
|