4688551043
git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@167 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
1342 lines
31 KiB
C
1342 lines
31 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: exec.c *
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* Last rev: 8/2/88 *
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* mods: *
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* comments: Execute Prolog code *
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* *
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*************************************************************************/
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#ifdef SCCS
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static char SccsId[] = "@(#)cdmgr.c 1.1 05/02/98";
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#endif
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#include "absmi.h"
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#include "yapio.h"
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STATIC_PROTO(Int CallProlog, (PredEntry *, unsigned int, Int));
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STATIC_PROTO(Int p_save_cp, (void));
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STATIC_PROTO(Int p_execute, (void));
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STATIC_PROTO(Int p_execute0, (void));
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STATIC_PROTO(Int p_at_execute, (void));
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static Int
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FastCallProlog(PredEntry *pen) {
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#ifdef DEPTH_LIMIT
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if (DEPTH <= MkIntTerm(1)) {/* I assume Module==0 is prolog */
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if (pen->ModuleOfPred) {
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if (DEPTH == MkIntTerm(0))
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return(FALSE);
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else DEPTH = RESET_DEPTH();
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}
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} else if (pen->ModuleOfPred)
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DEPTH -= MkIntConstant(2);
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#endif /* DEPTH_LIMIT */
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#ifdef LOW_LEVEL_TRACER
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if (do_low_level_trace)
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low_level_trace(enter_pred,pen,XREGS+1);
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#endif /* LOW_LEVEL_TRACE */
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if (pen->PredFlags & ProfiledPredFlag)
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pen->StatisticsForPred.NOfEntries++;
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CP = P;
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P = (yamop *)(pen->CodeOfPred);
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WRITE_UNLOCK(pen->PRWLock);
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ENV = YENV;
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YENV = ASP;
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YENV[E_CB] = (CELL) B;
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return (Unsigned(&(pen->StateOfPred)));
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}
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static Int
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CallProlog(PredEntry *pen, unsigned int arity, Int position)
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{
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CELL flags;
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WRITE_LOCK(pen->PRWLock);
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flags = pen->PredFlags;
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if ((flags & (CompiledPredFlag | DynamicPredFlag)) ||
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pen->OpcodeOfPred == UNDEF_OPCODE) {
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if (position == -1 ||
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pen->OpcodeOfPred == UNDEF_OPCODE) {
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return(FastCallProlog(pen));
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} else {
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CODEADDR q;
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#ifdef DEPTH_LIMIT
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if (DEPTH <= MkIntTerm(1)) {/* I assume Module==0 is prolog */
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if (pen->ModuleOfPred) {
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if (DEPTH == MkIntTerm(0))
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return(FALSE);
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else DEPTH = RESET_DEPTH();
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}
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} else if (pen->ModuleOfPred)
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DEPTH -= MkIntConstant(2);
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#endif /* DEPTH_LIMIT */
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#ifdef LOW_LEVEL_TRACER
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if (do_low_level_trace)
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low_level_trace(enter_pred,pen,XREGS+1);
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#endif /* LOW_LEVEL_TRACE */
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ENV = YENV;
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YENV = ASP;
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YENV[E_CB] = (CELL)(B->cp_b);
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CP = P;
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q = pen->FirstClause;
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if (pen->PredFlags & ProfiledPredFlag) {
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LOCK(pen->StatisticsForPred.lock);
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if (position == 1)
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pen->StatisticsForPred.NOfEntries++;
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else
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pen->StatisticsForPred.NOfRetries++;
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UNLOCK(pen->StatisticsForPred.lock);
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}
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if (flags & DynamicPredFlag) {
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CLAUSECODE->arity = pen->ArityOfPE;
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CLAUSECODE->func = pen->FunctorOfPred;
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while (position > 1) {
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while (ClauseCodeToClause(q)->ClFlags & ErasedMask)
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q = NextClause(q);
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position--;
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q = NextClause(q);
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}
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while (ClauseCodeToClause(q)->ClFlags & ErasedMask)
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q = NextClause(q);
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#if defined(YAPOR) || defined(THREADS)
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{
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Clause *cl = ClauseCodeToClause(q);
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LOCK(cl->ClLock);
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TRAIL_CLREF(cl);
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INC_DBREF_COUNT(cl);
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UNLOCK(cl->ClLock);
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}
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#else
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if (!(ClauseCodeToClause(q)->ClFlags & InUseMask)) {
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OPREG *opp = &(ClauseCodeToClause(q)->ClFlags);
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TRAIL_CLREF(ClauseCodeToClause(q));
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*opp |= InUseMask;
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}
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#endif
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CLAUSECODE->clause = (CODEADDR)NEXTOP((yamop *)(q),ld);
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P = (yamop *)CLAUSECODE->clause;
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WRITE_UNLOCK(pen->PRWLock);
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return((CELL)(&(CLAUSECODE->clause)));
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} else {
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for (; position > 1; position--)
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q = NextClause(q);
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P = NEXTOP((yamop *)(q),ld);
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WRITE_UNLOCK(pen->PRWLock);
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return (Unsigned(&(pen->StateOfPred)));
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}
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}
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}
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if (flags & UserCPredFlag) {
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Int(*p) (void) = (Int(*) (void)) pen->CodeOfPred;
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Int out;
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WRITE_UNLOCK(pen->PRWLock);
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save_machine_regs();
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out = YapExecute(p);
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restore_machine_regs();
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return(out);
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}
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if (flags & CPredFlag) {
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Int(*p) (void) = (Int(*) (void)) pen->CodeOfPred;
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WRITE_UNLOCK(pen->PRWLock);
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return ((*p) ());
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} else if (flags & BasicPredFlag) {
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if (pen->OpcodeOfPred != UNDEF_OPCODE) {
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Int(*p) (void) = (Int(*) (void)) pen->CodeOfPred;
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WRITE_UNLOCK(pen->PRWLock);
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return (((*p) ()) != FALSE);
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}
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}
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return (FALSE);
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}
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static Term
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current_cp_as_integer(void)
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{
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return(MkIntTerm(LCL0-(CELL *)B));
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}
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static Int
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p_save_cp(void)
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{
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Term t = Deref(ARG1);
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Term td;
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#if SHADOW_HB
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register CELL *HBREG = HB;
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#endif
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if (!IsVarTerm(t)) return(FALSE);
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td = current_cp_as_integer();
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BIND((CELL *)t,td,bind_save_cp);
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#ifdef COROUTINING
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DO_TRAIL(CellPtr(t), td);
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if (CellPtr(t) < H0) WakeUp((CELL *)t);
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bind_save_cp:
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#endif
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return(TRUE);
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}
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inline static int
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SpecialCallFunctor(Functor f) {
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return(f == FunctorComma || f == FunctorOr || f == FunctorArrow ||
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f == FunctorVBar || f == FunctorNot || f == FunctorAltNot);
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}
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inline static Int
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CallMetaCall(void) {
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ARG2 = current_cp_as_integer(); /* p_save_cp */
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ARG3 = ARG1;
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WRITE_LOCK(PredMetaCall->PRWLock);
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return (FastCallProlog(PredMetaCall));
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}
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inline static Int
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EnterCreepMode(PredEntry *pen) {
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PredEntry *PredSpy = RepPredProp(PredPropByFunc(FunctorSpy));
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ARG1 = MkPairTerm(Module_Name((CODEADDR)(pen)),ARG1);
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CreepFlag = CalculateStackGap();
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P_before_spy = P;
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WRITE_LOCK(PredSpy->PRWLock);
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return (FastCallProlog(PredSpy));
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}
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static Int
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p_execute(void)
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{ /* '$execute'(Goal) */
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Term t = Deref(ARG1);
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Prop pe;
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Atom a;
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restart_exec:
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if (PredGoalExpansion->OpcodeOfPred != UNDEF_OPCODE) {
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return(CallMetaCall());
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} else if (IsVarTerm(t)) {
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if (yap_flags[LANGUAGE_MODE_FLAG] == 1) {
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return(CallMetaCall());
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} else {
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Error(INSTANTIATION_ERROR,t,"call/1");
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return(FALSE);
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}
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} else if (IsApplTerm(t)) {
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register Functor f = FunctorOfTerm(t);
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register unsigned int i;
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register CELL *pt;
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unsigned int arity;
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if (IsExtensionFunctor(f)) {
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if (yap_flags[LANGUAGE_MODE_FLAG] == 1) {
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return(CallMetaCall());
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} else {
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Error(TYPE_ERROR_CALLABLE,t,"call/1");
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return(FALSE);
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}
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}
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if (SpecialCallFunctor(f)) {
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return(CallMetaCall());
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} else if (f == FunctorModule) {
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Term mod = ArgOfTerm(1, t);
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if (mod == ModuleName[CurrentModule]) {
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/* we can skip this operation */
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/* should catch most cases */
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t = ArgOfTerm(2, t);
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goto restart_exec;
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} else {
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/* I can't do better because I don't have a way of restoring the module */
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return(CallMetaCall());
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}
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} else {
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PredEntry *pen;
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arity = ArityOfFunctor(f);
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a = NameOfFunctor(f);
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if (CurrentModule)
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pe = PredPropByFunc(f);
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else {
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pe = GetPredPropByFunc(f);
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if (pe == NIL) {
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return(CallMetaCall());
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}
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}
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pen = RepPredProp(pe);
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/* You thought we would be over by now */
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/* but no meta calls require special preprocessing */
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if (pen->PredFlags & MetaPredFlag) {
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return(CallMetaCall());
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}
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if (yap_flags[SPY_CREEP_FLAG]) {
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return(EnterCreepMode(pen));
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}
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/* now let us do what we wanted to do from the beginning !! */
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/* I cannot use the standard macro here because
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otherwise I would dereference the argument and
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might skip a svar */
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pt = RepAppl(t)+1;
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for (i = 1; i <= arity; ++i) {
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#if SBA
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Term d0 = *pt++;
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if (d0 == 0)
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XREGS[i] = (CELL)(pt-1);
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else
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XREGS[i] = d0;
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#else
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XREGS[i] = *pt++;
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#endif
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}
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return (CallProlog(pen, arity, (Int) (-1)));
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}
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} else if (IsAtomOrIntTerm(t)) {
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if (IsIntTerm(t)) {
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if (yap_flags[LANGUAGE_MODE_FLAG] == 1) {
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return (CallMetaCall());
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} else {
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Error(TYPE_ERROR_CALLABLE,t,"call/1");
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return(FALSE);
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}
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}
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a = AtomOfTerm(t);
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if (a == AtomTrue || a == AtomOtherwise || a == AtomCut)
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return(TRUE);
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else if (a == AtomFail || a == AtomFalse)
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return(FALSE);
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/* call may not define new system predicates!! */
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if (CurrentModule)
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pe = PredProp(a, 0);
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else {
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pe = GetPredProp(a, 0);
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if (pe == NIL) {
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ARG1 = t;
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return(CallMetaCall());
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}
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}
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if (yap_flags[SPY_CREEP_FLAG]) {
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return(EnterCreepMode(RepPredProp(pe)));
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}
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return (CallProlog(RepPredProp(pe), 0, (Int) (-1)));
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} else {
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/* Is Pair Term */
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return(CallMetaCall());
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}
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}
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inline static Int
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CallMetaCallWithin(void)
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{
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WRITE_LOCK(PredMetaCall->PRWLock);
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return (FastCallProlog(PredMetaCall));
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}
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/* '$execute_within'(Goal,CutPt,OrigGoal) */
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static Int
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p_execute_within(void)
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{
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Term t = Deref(ARG1);
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unsigned int arity;
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Prop pe;
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Atom a;
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restart_exec:
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if (PredGoalExpansion->OpcodeOfPred != UNDEF_OPCODE) {
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return(CallMetaCallWithin());
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} else if (IsVarTerm(t)) {
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if (yap_flags[LANGUAGE_MODE_FLAG] == 1) {
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return(CallMetaCallWithin());
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} else {
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Error(INSTANTIATION_ERROR,t,"call/1");
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return(FALSE);
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}
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} else if (IsApplTerm(t)) {
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register Functor f = FunctorOfTerm(t);
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register unsigned int i;
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register CELL *pt;
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if (IsExtensionFunctor(f)) {
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if (yap_flags[LANGUAGE_MODE_FLAG] == 1) {
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return(CallMetaCallWithin());
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} else {
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Error(TYPE_ERROR_CALLABLE,t,"call/1");
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return(FALSE);
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}
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}
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if (SpecialCallFunctor(f)) {
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return(CallMetaCallWithin());
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} else if (f == FunctorModule) {
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Term mod = ArgOfTerm(1, t);
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if (mod == ModuleName[CurrentModule]) {
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/* we can skip this operation */
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/* should catch most cases */
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t = ArgOfTerm(2, t);
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goto restart_exec;
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} else {
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/* I can't do better because I don't have a way of restoring the module */
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return(CallMetaCallWithin());
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}
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} else {
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PredEntry *pen;
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arity = ArityOfFunctor(f);
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a = NameOfFunctor(f);
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if (CurrentModule)
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pe = PredPropByFunc(f);
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else {
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pe = GetPredPropByFunc(f);
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if (pe == NIL) {
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return(CallMetaCallWithin());
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}
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}
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pen = RepPredProp(pe);
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/* You thought we would be over by now */
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/* but no meta calls require special preprocessing */
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if (pen->PredFlags & MetaPredFlag) {
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return(CallMetaCallWithin());
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}
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/* at this point check if we should enter creep mode */
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if (yap_flags[SPY_CREEP_FLAG]) {
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return(EnterCreepMode(pen));
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}
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|
/* now let us do what we wanted to do from the beginning !! */
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/* I cannot use the standard macro here because
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|
otherwise I would dereference the argument and
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|
might skip a svar */
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pt = RepAppl(t)+1;
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for (i = 1; i <= arity; ++i) {
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#if SBA
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Term d0 = *pt++;
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if (d0 == 0)
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XREGS[i] = (CELL)(pt-1);
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else
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XREGS[i] = d0;
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#else
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XREGS[i] = *pt++;
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#endif
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}
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return (CallProlog(pen, arity, (Int) (-1)));
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}
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} else if (IsAtomOrIntTerm(t)) {
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if (IsIntTerm(t)) {
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if (yap_flags[LANGUAGE_MODE_FLAG] == 1) {
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return (CallMetaCallWithin());
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} else {
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Error(TYPE_ERROR_CALLABLE,t,"call/1");
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return(FALSE);
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}
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}
|
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a = AtomOfTerm(t);
|
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if (a == AtomTrue || a == AtomOtherwise)
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return(TRUE);
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else if (a == AtomCut) {
|
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#ifdef SBA
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choiceptr pt0 = (choiceptr)IntegerOfTerm(Deref(ARG2));
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#else
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choiceptr pt0 = (choiceptr)(LCL0-IntegerOfTerm(Deref(ARG2)));
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#endif
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if (TopB != NULL && YOUNGER_CP(TopB,pt0)) {
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pt0 = TopB;
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if (DelayedB == NULL || YOUNGER_CP(pt0,DelayedB))
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DelayedB = pt0;
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}
|
|
/* find where to cut to */
|
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#ifdef YAPOR
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if (SHOULD_CUT_UP_TO(B,pt0)) {
|
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/* Wow, we're gonna cut!!! */
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CUT_prune_to(pt0);
|
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#else
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if (SHOULD_CUT_UP_TO(B,pt0)) {
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/* Wow, we're gonna cut!!! */
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B = pt0;
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#endif /* YAPOR */
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HB = PROTECT_FROZEN_H(B);
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}
|
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return(TRUE);
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|
} else if (a == AtomFail || a == AtomFalse)
|
|
return(FALSE);
|
|
/* call may not define new system predicates!! */
|
|
if (CurrentModule)
|
|
pe = PredProp(a, 0);
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|
else {
|
|
pe = GetPredProp(a, 0);
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|
if (pe == NIL) {
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ARG1 = t;
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return(CallMetaCallWithin());
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|
}
|
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}
|
|
if (yap_flags[SPY_CREEP_FLAG]) {
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return(EnterCreepMode(RepPredProp(pe)));
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|
}
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return (CallProlog(RepPredProp(pe), 0, (Int) (-1)));
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|
} else {
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/* Is Pair Term */
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return(CallMetaCallWithin());
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}
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}
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static Int
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p_execute0(void)
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{ /* '$execute'(Goal) */
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Term t = Deref(ARG1);
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unsigned int arity;
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Prop pe;
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|
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if (IsAtomTerm(t)) {
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Atom a = AtomOfTerm(t);
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arity = 0;
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if (CurrentModule)
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pe = PredProp(a, arity);
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else {
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pe = GetPredProp(a, arity);
|
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if (pe == NIL)
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return(FALSE);
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}
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} else if (IsApplTerm(t)) {
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|
register Functor f = FunctorOfTerm(t);
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register unsigned int i;
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register CELL *pt;
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|
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if (IsExtensionFunctor(f))
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return(FALSE);
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arity = ArityOfFunctor(f);
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|
/* I cannot use the standard macro here because
|
|
otherwise I would dereference the argument and
|
|
might skip a svar */
|
|
pt = RepAppl(t)+1;
|
|
for (i = 1; i <= arity; ++i)
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|
#if SBA
|
|
{
|
|
Term d0 = *pt++;
|
|
if (d0 == 0)
|
|
XREGS[i] = (CELL)(pt-1);
|
|
else
|
|
XREGS[i] = d0;
|
|
}
|
|
#else
|
|
XREGS[i] = *pt++;
|
|
#endif
|
|
if (CurrentModule)
|
|
pe = PredPropByFunc(f);
|
|
else {
|
|
pe = GetPredPropByFunc(f);
|
|
if (pe == NIL)
|
|
return(FALSE);
|
|
}
|
|
} else
|
|
return (FALSE); /* for the moment */
|
|
/* N = arity; */
|
|
/* call may not define new system predicates!! */
|
|
return (CallProlog(RepPredProp(pe), arity, (Int) (-1)));
|
|
}
|
|
|
|
static Int
|
|
p_execute_0(void)
|
|
{ /* '$execute_0'(Goal) */
|
|
Term t = Deref(ARG1);
|
|
Prop pe;
|
|
Atom a;
|
|
|
|
a = AtomOfTerm(t);
|
|
if (CurrentModule)
|
|
pe = PredProp(a, 0);
|
|
else {
|
|
pe = GetPredProp(a, 0);
|
|
if (pe == NIL)
|
|
return(FALSE);
|
|
}
|
|
return (CallProlog(RepPredProp(pe), 0, (Int) (-1)));
|
|
|
|
}
|
|
|
|
static Int
|
|
p_execute_1(void)
|
|
{ /* '$execute_0'(Goal) */
|
|
Term t = Deref(ARG1);
|
|
Prop pe;
|
|
Atom a;
|
|
|
|
a = AtomOfTerm(t);
|
|
ARG1 = ARG2;
|
|
if (CurrentModule)
|
|
pe = PredProp(a, 1);
|
|
else {
|
|
pe = GetPredProp(a, 1);
|
|
if (pe == NIL)
|
|
return(FALSE);
|
|
}
|
|
return (CallProlog(RepPredProp(pe), 1, (Int) (-1)));
|
|
}
|
|
|
|
static Int
|
|
p_execute_2(void)
|
|
{ /* '$execute_2'(Goal) */
|
|
Term t = Deref(ARG1);
|
|
Prop pe;
|
|
Atom a;
|
|
|
|
a = AtomOfTerm(t);
|
|
ARG1 = ARG2;
|
|
ARG2 = ARG3;
|
|
if (CurrentModule)
|
|
pe = PredProp(a, 2);
|
|
else {
|
|
pe = GetPredProp(a, 2);
|
|
if (pe == NIL)
|
|
return(FALSE);
|
|
}
|
|
return (CallProlog(RepPredProp(pe), 2, (Int) (-1)));
|
|
}
|
|
|
|
static Int
|
|
p_execute_3(void)
|
|
{ /* '$execute_3'(Goal) */
|
|
Term t = Deref(ARG1);
|
|
Prop pe;
|
|
Atom a;
|
|
|
|
a = AtomOfTerm(t);
|
|
ARG1 = ARG2;
|
|
ARG2 = ARG3;
|
|
ARG3 = ARG4;
|
|
if (CurrentModule)
|
|
pe = PredProp(a, 3);
|
|
else {
|
|
pe = GetPredProp(a, 3);
|
|
if (pe == NIL)
|
|
return(FALSE);
|
|
}
|
|
return (CallProlog(RepPredProp(pe), 3, (Int) (-1)));
|
|
}
|
|
|
|
static Int
|
|
p_execute_4(void)
|
|
{ /* '$execute_4'(Goal) */
|
|
Term t = Deref(ARG1);
|
|
Prop pe;
|
|
Atom a;
|
|
|
|
a = AtomOfTerm(t);
|
|
ARG1 = ARG2;
|
|
ARG2 = ARG3;
|
|
ARG3 = ARG4;
|
|
ARG4 = ARG5;
|
|
if (CurrentModule)
|
|
pe = PredProp(a, 4);
|
|
else {
|
|
pe = GetPredProp(a, 4);
|
|
if (pe == NIL)
|
|
return(FALSE);
|
|
}
|
|
return (CallProlog(RepPredProp(pe), 4, (Int) (-1)));
|
|
}
|
|
|
|
static Int
|
|
p_execute_5(void)
|
|
{ /* '$execute_5'(Goal) */
|
|
Term t = Deref(ARG1);
|
|
Prop pe;
|
|
Atom a;
|
|
|
|
a = AtomOfTerm(t);
|
|
ARG1 = ARG2;
|
|
ARG2 = ARG3;
|
|
ARG3 = ARG4;
|
|
ARG4 = ARG5;
|
|
ARG5 = ARG6;
|
|
if (CurrentModule)
|
|
pe = PredProp(a, 5);
|
|
else {
|
|
pe = GetPredProp(a, 5);
|
|
if (pe == NIL)
|
|
return(FALSE);
|
|
}
|
|
return (CallProlog(RepPredProp(pe), 5, (Int) (-1)));
|
|
}
|
|
|
|
static Int
|
|
p_execute_6(void)
|
|
{ /* '$execute_6'(Goal) */
|
|
Term t = Deref(ARG1);
|
|
Prop pe;
|
|
Atom a;
|
|
|
|
a = AtomOfTerm(t);
|
|
ARG1 = ARG2;
|
|
ARG2 = ARG3;
|
|
ARG3 = ARG4;
|
|
ARG4 = ARG5;
|
|
ARG5 = ARG6;
|
|
ARG6 = ARG7;
|
|
if (CurrentModule)
|
|
pe = PredProp(a, 6);
|
|
else {
|
|
pe = GetPredProp(a, 6);
|
|
if (pe == NIL)
|
|
return(FALSE);
|
|
}
|
|
return (CallProlog(RepPredProp(pe), 6, (Int) (-1)));
|
|
}
|
|
|
|
static Int
|
|
p_execute_7(void)
|
|
{ /* '$execute_7'(Goal) */
|
|
Term t = Deref(ARG1);
|
|
Prop pe;
|
|
Atom a;
|
|
|
|
a = AtomOfTerm(t);
|
|
ARG1 = ARG2;
|
|
ARG2 = ARG3;
|
|
ARG3 = ARG4;
|
|
ARG4 = ARG5;
|
|
ARG5 = ARG6;
|
|
ARG6 = ARG7;
|
|
ARG7 = ARG8;
|
|
if (CurrentModule)
|
|
pe = PredProp(a, 7);
|
|
else {
|
|
pe = GetPredProp(a, 7);
|
|
if (pe == NIL)
|
|
return(FALSE);
|
|
}
|
|
return (CallProlog(RepPredProp(pe), 7, (Int) (-1)));
|
|
}
|
|
|
|
static Int
|
|
p_execute_8(void)
|
|
{ /* '$execute_8'(Goal) */
|
|
Term t = Deref(ARG1);
|
|
Prop pe;
|
|
Atom a;
|
|
|
|
a = AtomOfTerm(t);
|
|
ARG1 = ARG2;
|
|
ARG2 = ARG3;
|
|
ARG3 = ARG4;
|
|
ARG4 = ARG5;
|
|
ARG5 = ARG6;
|
|
ARG6 = ARG7;
|
|
ARG7 = ARG8;
|
|
ARG8 = ARG9;
|
|
if (CurrentModule)
|
|
pe = PredProp(a, 8);
|
|
else {
|
|
pe = GetPredProp(a, 8);
|
|
if (pe == NIL)
|
|
return(FALSE);
|
|
}
|
|
return (CallProlog(RepPredProp(pe), 8, (Int) (-1)));
|
|
}
|
|
|
|
static Int
|
|
p_execute_9(void)
|
|
{ /* '$execute_9'(Goal) */
|
|
Term t = Deref(ARG1);
|
|
Prop pe;
|
|
Atom a;
|
|
|
|
a = AtomOfTerm(t);
|
|
ARG1 = ARG2;
|
|
ARG2 = ARG3;
|
|
ARG3 = ARG4;
|
|
ARG4 = ARG5;
|
|
ARG5 = ARG6;
|
|
ARG6 = ARG7;
|
|
ARG7 = ARG8;
|
|
ARG8 = ARG9;
|
|
ARG9 = ARG10;
|
|
if (CurrentModule)
|
|
pe = PredProp(a, 9);
|
|
else {
|
|
pe = GetPredProp(a, 9);
|
|
if (pe == NIL)
|
|
return(FALSE);
|
|
}
|
|
return (CallProlog(RepPredProp(pe), 9, (Int) (-1)));
|
|
}
|
|
|
|
static Int
|
|
p_execute_10(void)
|
|
{ /* '$execute_10'(Goal) */
|
|
Term t = Deref(ARG1);
|
|
Prop pe;
|
|
Atom a;
|
|
|
|
a = AtomOfTerm(t);
|
|
ARG1 = ARG2;
|
|
ARG2 = ARG3;
|
|
ARG3 = ARG4;
|
|
ARG4 = ARG5;
|
|
ARG5 = ARG6;
|
|
ARG6 = ARG7;
|
|
ARG7 = ARG8;
|
|
ARG8 = ARG9;
|
|
ARG9 = ARG10;
|
|
ARG10 = ARG11;
|
|
if (CurrentModule)
|
|
pe = PredProp(a, 10);
|
|
else {
|
|
pe = GetPredProp(a, 10);
|
|
if (pe == NIL)
|
|
return(FALSE);
|
|
}
|
|
return (CallProlog(RepPredProp(pe), 10, (Int) (-1)));
|
|
}
|
|
|
|
#ifdef DEPTH_LIMIT
|
|
static Int
|
|
p_execute_depth_limit(void) {
|
|
Term d = Deref(ARG2);
|
|
if (IsVarTerm(d)) {
|
|
Error(INSTANTIATION_ERROR,d,"depth_bound_call/2");
|
|
} else if (!IsIntTerm(d)) {
|
|
Error(TYPE_ERROR_INTEGER, d, "depth_bound_call/2");
|
|
return(FALSE);
|
|
}
|
|
DEPTH = MkIntTerm(IntOfTerm(d)*2);
|
|
return(p_execute());
|
|
}
|
|
#endif
|
|
|
|
static Int
|
|
p_pred_goal_expansion_on(void) {
|
|
/* a goal needs expansion if we have goal_expansion defined or
|
|
if the goal is a meta-call */
|
|
return (PredGoalExpansion->OpcodeOfPred != UNDEF_OPCODE);
|
|
}
|
|
|
|
static Int
|
|
p_at_execute(void)
|
|
{ /* '$execute'(Goal,ClauseNumber) */
|
|
Term t = Deref(ARG1), t2 = Deref(ARG2);
|
|
unsigned int arity;
|
|
Prop pe;
|
|
Atom a;
|
|
|
|
if (IsAtomTerm(t))
|
|
arity = 0, a = AtomOfTerm(t);
|
|
else if (IsApplTerm(t)) {
|
|
register Functor f = FunctorOfTerm(t);
|
|
register unsigned int i;
|
|
register CELL *pt;
|
|
|
|
if (IsBlobFunctor(f))
|
|
return(FALSE);
|
|
arity = ArityOfFunctor(f);
|
|
a = NameOfFunctor(f);
|
|
/* I cannot use the standard macro here because
|
|
otherwise I would dereference the argument and
|
|
might skip a svar */
|
|
pt = RepAppl(t)+1;
|
|
for (i = 1; i <= arity; ++i)
|
|
#if SBA
|
|
{
|
|
Term d0 = *pt++;
|
|
if (d0 == 0)
|
|
XREGS[i] = (CELL)(pt-1);
|
|
else
|
|
XREGS[i] = d0;
|
|
}
|
|
#else
|
|
XREGS[i] = *pt++;
|
|
#endif
|
|
} else
|
|
return (FALSE); /* for the moment */
|
|
if (IsVarTerm(t2) || !IsIntTerm(t2))
|
|
return (FALSE);
|
|
/* N = arity; */
|
|
/* call may not define new system predicates!! */
|
|
if (CurrentModule) {
|
|
pe = PredProp(a, arity);
|
|
} else {
|
|
pe = GetPredProp(a, arity);
|
|
if (pe == NIL)
|
|
return(FALSE);
|
|
}
|
|
return (CallProlog(RepPredProp(pe), arity, IntOfTerm(t2)));
|
|
}
|
|
|
|
int
|
|
exec_absmi(int top)
|
|
{
|
|
int lval;
|
|
if (top && (lval = sigsetjmp (RestartEnv, 1)) != 0) {
|
|
if (lval == 1) { /* restart */
|
|
int depth;
|
|
/* otherwise, SetDBForThrow will fail entering critical mode */
|
|
PrologMode = UserMode;
|
|
/* find out where to cut to */
|
|
#if defined(__GNUC__)
|
|
#if defined(hppa) || defined(__alpha)
|
|
/* siglongjmp resets the TR hardware register */
|
|
restore_TR();
|
|
#endif
|
|
#if defined(__alpha)
|
|
/* siglongjmp resets the H hardware register */
|
|
restore_H();
|
|
#endif
|
|
#endif
|
|
depth = SetDBForThrow(MkAtomTerm(LookupAtom("abort")));
|
|
if (depth == 0) {
|
|
Error(SYSTEM_ERROR, TermNil, "database entry for throw corrupted");
|
|
}
|
|
/* make the abstract machine jump where we want them to jump to */
|
|
|
|
#ifdef SBA
|
|
B = (choiceptr)depth;
|
|
#else
|
|
B = (choiceptr)(LCL0-depth);
|
|
#endif
|
|
yap_flags[SPY_CREEP_FLAG] = 0;
|
|
CreepFlag = CalculateStackGap();
|
|
P = (yamop *)FAILCODE;
|
|
}
|
|
if (lval == 2) { /* arithmetic exception */
|
|
/* must be done here, otherwise siglongjmp will clobber all the registers */
|
|
Error(YAP_matherror,TermNil,NULL);
|
|
/* reset the registers so that we don't have trash in abstract machine */
|
|
set_fpu_exceptions(yap_flags[LANGUAGE_MODE_FLAG] == 1);
|
|
P = (yamop *)FAILCODE;
|
|
}
|
|
if (lval == 3) { /* saved state */
|
|
return(FALSE);
|
|
}
|
|
}
|
|
PrologMode = UserMode;
|
|
return(absmi(0));
|
|
}
|
|
|
|
static int
|
|
do_goal(CODEADDR CodeAdr, int arity, CELL *pt, int args_to_save, int top)
|
|
{
|
|
choiceptr saved_b = B;
|
|
|
|
/* create an initial pseudo environment so that when garbage
|
|
collection is going up in the environment chain it doesn't get
|
|
confused */
|
|
YENV = ASP;
|
|
YENV[E_CP] = (CELL)P;
|
|
YENV[E_CB] = (CELL)B;
|
|
YENV[E_E] = (CELL)ENV;
|
|
#ifdef DEPTH_LIMIT
|
|
YENV[E_DEPTH] = DEPTH;
|
|
#endif
|
|
ENV = YENV;
|
|
ASP -= EnvSizeInCells;
|
|
/* and now create a pseudo choicepoint for much the same reasons */
|
|
CP = (yamop *) YESCODE;
|
|
/* this is an hack to save the arguments */
|
|
{
|
|
CELL *pt1 = XREGS+1+args_to_save;
|
|
|
|
while (pt1 > XREGS+1)
|
|
*--ASP = *--pt1;
|
|
}
|
|
*--ASP = MkIntTerm(args_to_save+1);
|
|
{
|
|
int i;
|
|
for (i = 0; i < arity; i++) {
|
|
XREGS[i+1] = *pt++;
|
|
}
|
|
}
|
|
B = (choiceptr)ASP;
|
|
B--;
|
|
#ifdef TABLING
|
|
if (top) {
|
|
DepFr_cons_cp(GLOBAL_root_dep_fr) = B;
|
|
}
|
|
#endif /* TABLING */
|
|
B->cp_h = H;
|
|
B->cp_tr = TR;
|
|
B->cp_cp = CP;
|
|
B->cp_ap = (yamop *) NOCODE;
|
|
B->cp_env = ENV;
|
|
B->cp_b = saved_b;
|
|
#ifdef DEPTH_LIMIT
|
|
B->cp_depth = DEPTH;
|
|
#endif /* DEPTH_LIMIT */
|
|
if (top) {
|
|
Term t;
|
|
#if COROUTINING
|
|
RESET_VARIABLE((CELL *)GlobalBase);
|
|
DelayedVars = NewTimedVar((CELL)GlobalBase);
|
|
WokenGoals = NewTimedVar(TermNil);
|
|
MutableList = NewTimedVar(TermNil);
|
|
AttsMutableList = NewTimedVar(TermNil);
|
|
#endif
|
|
t = NewTimedVar(MkIntTerm(0));
|
|
CurrentModulePtr = RepAppl(t)+1;
|
|
}
|
|
YENV = ASP = (CELL *)B;
|
|
HB = H;
|
|
YENV[E_CB] = Unsigned (B);
|
|
P = (yamop *) CodeAdr;
|
|
S = CellPtr (&(RepPredProp (PredProp (AtomCall, 1))->StateOfPred)); /* A1 mishaps */
|
|
TopB = B;
|
|
|
|
return(exec_absmi(top));
|
|
}
|
|
|
|
|
|
Int
|
|
execute_goal(Term t, int nargs)
|
|
{
|
|
Int out;
|
|
CODEADDR CodeAdr;
|
|
yamop *saved_p, *saved_cp;
|
|
Prop pe;
|
|
PredEntry *ppe;
|
|
CELL *pt;
|
|
/* preserve the current restart environment */
|
|
/* visualc*/
|
|
/* just keep the difference because of possible garbage collections */
|
|
Int MyOldTopB = LCL0-(CELL *)TopB;
|
|
Int MyOldDelayedB = LCL0-(CELL *)DelayedB;
|
|
choiceptr OldTopB, OldDelayedB;
|
|
|
|
|
|
DelayedB = NULL;
|
|
/* forget we have a DelayedB to do, this is not a problem for the embedded computation to solve */
|
|
|
|
saved_p = P;
|
|
saved_cp = CP;
|
|
|
|
if (IsAtomTerm(t)) {
|
|
Atom a = AtomOfTerm(t);
|
|
pt = NULL;
|
|
pe = GetPredProp(a, 0);
|
|
} else if (IsApplTerm(t)) {
|
|
Functor f = FunctorOfTerm(t);
|
|
|
|
if (IsBlobFunctor(f)) {
|
|
Error(TYPE_ERROR_CALLABLE,t,"call/1");
|
|
return(FALSE);
|
|
}
|
|
/* I cannot use the standard macro here because
|
|
otherwise I would dereference the argument and
|
|
might skip a svar */
|
|
pt = RepAppl(t)+1;
|
|
pe = GetPredPropByFunc(f);
|
|
} else {
|
|
Error(TYPE_ERROR_CALLABLE,t,"call/1");
|
|
return(FALSE);
|
|
}
|
|
ppe = RepPredProp(pe);
|
|
if (pe != NIL) {
|
|
READ_LOCK(ppe->PRWLock);
|
|
}
|
|
if (pe == NIL ||
|
|
ppe->OpcodeOfPred == UNDEF_OPCODE ||
|
|
ppe->PredFlags & (UserCPredFlag|CPredFlag|BasicPredFlag) ) {
|
|
if (pe != NIL) {
|
|
READ_UNLOCK(ppe->PRWLock);
|
|
}
|
|
return(CallMetaCall());
|
|
}
|
|
if (IsAtomTerm(t)) {
|
|
Atom at = AtomOfTerm(t);
|
|
CodeAdr = RepPredProp (PredProp (at, 0))->CodeOfPred;
|
|
READ_UNLOCK(ppe->PRWLock);
|
|
out = do_goal(CodeAdr, 0, pt, nargs, FALSE);
|
|
} else {
|
|
Functor f = FunctorOfTerm(t);
|
|
CodeAdr = RepPredProp (PredPropByFunc (f))->CodeOfPred;
|
|
READ_UNLOCK(ppe->PRWLock);
|
|
out = do_goal(CodeAdr, ArityOfFunctor(f), pt, nargs, FALSE);
|
|
}
|
|
|
|
if (out == 1) {
|
|
choiceptr old_B;
|
|
/* we succeeded, let's prune */
|
|
/* restore the old environment */
|
|
/* get to previous environment */
|
|
#ifdef YAPOR
|
|
CUT_prune_to((choiceptr)(ENV[E_CB]));
|
|
#else
|
|
B = (choiceptr)(ENV[E_CB]);
|
|
#endif /* YAPOR */
|
|
/* find out where we have the old arguments */
|
|
old_B = ((choiceptr)(ENV-(EnvSizeInCells+nargs+1)))-1;
|
|
{
|
|
int i;
|
|
for (i=1; i<= nargs; i++) {
|
|
#if MIN_ARRAY == 0
|
|
XREGS[i] = old_B->cp_args[i];
|
|
#else
|
|
XREGS[i] = old_B->cp_last.cp_args[i];
|
|
#endif
|
|
}
|
|
}
|
|
CP = saved_cp;
|
|
P = saved_p;
|
|
ASP = ENV;
|
|
ENV = (CELL *)(ENV[E_E]);
|
|
#ifdef DEPTH_LIMIT
|
|
DEPTH= ENV[E_DEPTH];
|
|
#endif
|
|
/* we have failed, and usually we would backtrack to this B,
|
|
trouble is, we may also have a delayed cut to do */
|
|
OldTopB = (choiceptr)(LCL0-MyOldTopB);
|
|
OldDelayedB = (choiceptr)(LCL0-MyOldDelayedB);
|
|
if (DelayedB != NULL) {
|
|
if (YOUNGER_CP(DelayedB,B)) {
|
|
/* we have a delayed cut to do */
|
|
if (YOUNGER_CP(OldTopB,DelayedB)) {
|
|
/* and this delayed cut is to before the c-code that actually called us */
|
|
B = OldTopB;
|
|
/* did we have a cut which was cutting more than our current cut? */
|
|
if (OldDelayedB != NULL && YOUNGER_CP(DelayedB,OldDelayedB))
|
|
DelayedB = OldDelayedB;
|
|
} else {
|
|
/* just cut back to where we should cut */
|
|
B = DelayedB;
|
|
DelayedB = OldDelayedB;
|
|
}
|
|
}
|
|
} else {
|
|
DelayedB = OldDelayedB;
|
|
}
|
|
TopB = OldTopB;
|
|
HB = B->cp_h;
|
|
YENV = ENV;
|
|
return(TRUE);
|
|
} else if (out == 0) {
|
|
ASP = B->cp_env;
|
|
{
|
|
int i;
|
|
for (i=1; i<= nargs; i++) {
|
|
#if MIN_ARRAY==0
|
|
XREGS[i] = B->cp_args[i];
|
|
#else
|
|
XREGS[i] = B->cp_last.cp_args[i];
|
|
#endif
|
|
}
|
|
}
|
|
P = saved_p;
|
|
CP = saved_cp;
|
|
H = B->cp_h;
|
|
#ifdef DEPTH_LIMIT
|
|
DEPTH= B->cp_depth;
|
|
#endif
|
|
YENV = ENV = (CELL *)((B->cp_env)[E_E]);
|
|
B = B->cp_b;
|
|
SET_BB(B);
|
|
/* we have failed, and usually we would backtrack to this B,
|
|
trouble is, we may also have a delayed cut to do */
|
|
OldTopB = (choiceptr)(LCL0-MyOldTopB);
|
|
OldDelayedB = (choiceptr)(LCL0-MyOldDelayedB);
|
|
if (DelayedB != NULL) {
|
|
if (YOUNGER_CP(DelayedB,B)) {
|
|
/* we have a delayed cut to do */
|
|
if (YOUNGER_CP(OldTopB,DelayedB)) {
|
|
/* and this delayed cut is to before the c-code that actually called us */
|
|
B = OldTopB;
|
|
/* did we have a cut which was cutting more than our current cut? */
|
|
if (OldDelayedB != NULL && YOUNGER_CP(DelayedB,OldDelayedB))
|
|
DelayedB = OldDelayedB;
|
|
} else {
|
|
/* just cut back to where we should cut */
|
|
B = DelayedB;
|
|
DelayedB = OldDelayedB;
|
|
}
|
|
}
|
|
} else {
|
|
DelayedB = OldDelayedB;
|
|
}
|
|
TopB = OldTopB;
|
|
HB = PROTECT_FROZEN_H(B);
|
|
return(FALSE);
|
|
} else {
|
|
Error(SYSTEM_ERROR,TermNil,"emulator crashed");
|
|
return(FALSE);
|
|
}
|
|
}
|
|
|
|
int
|
|
RunTopGoal(Term t)
|
|
{
|
|
CODEADDR CodeAdr;
|
|
Prop pe;
|
|
PredEntry *ppe;
|
|
CELL *pt;
|
|
UInt arity;
|
|
|
|
if (IsAtomTerm(t)) {
|
|
Atom a = AtomOfTerm(t);
|
|
pt = NULL;
|
|
pe = GetPredProp(a, 0);
|
|
arity = 0;
|
|
} else if (IsApplTerm(t)) {
|
|
Functor f = FunctorOfTerm(t);
|
|
|
|
if (IsBlobFunctor(f)) {
|
|
Error(TYPE_ERROR_CALLABLE,t,"call/1");
|
|
return(FALSE);
|
|
}
|
|
/* I cannot use the standard macro here because
|
|
otherwise I would dereference the argument and
|
|
might skip a svar */
|
|
pe = GetPredPropByFunc(f);
|
|
pt = RepAppl(t)+1;
|
|
arity = ArityOfFunctor(f);
|
|
} else {
|
|
Error(TYPE_ERROR_CALLABLE,t,"call/1");
|
|
return(FALSE);
|
|
}
|
|
ppe = RepPredProp(pe);
|
|
if (pe != NIL) {
|
|
READ_LOCK(ppe->PRWLock);
|
|
}
|
|
if (pe == NIL ||
|
|
ppe->OpcodeOfPred == UNDEF_OPCODE ||
|
|
ppe->PredFlags & (UserCPredFlag|CPredFlag|BasicPredFlag) )
|
|
{
|
|
if (pe != NIL) {
|
|
READ_UNLOCK(ppe->PRWLock);
|
|
}
|
|
/* we must always start the emulator with Prolog code */
|
|
return(FALSE);
|
|
}
|
|
CodeAdr = ppe->CodeOfPred;
|
|
READ_UNLOCK(ppe->PRWLock);
|
|
if (TrailTop - HeapTop < 2048) {
|
|
PrologMode = BootMode;
|
|
Error(SYSTEM_ERROR,TermNil,
|
|
"unable to boot because of too little heap space");
|
|
}
|
|
return(do_goal(CodeAdr, arity, pt, 0, TRUE));
|
|
}
|
|
|
|
static void
|
|
restore_regs(Term t)
|
|
{
|
|
if (IsApplTerm(t)) {
|
|
Int i;
|
|
Int max = ArityOfFunctor(FunctorOfTerm(t));
|
|
CELL *ptr = RepAppl(t)+1;
|
|
|
|
for (i = 0; i < max; i += 2) {
|
|
Int j = IntOfTerm(ptr[0]);
|
|
XREGS[j] = ptr[1];
|
|
ptr+=2;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* low level voodoo to restore temporary registers after a call */
|
|
static Int
|
|
p_restore_regs(void)
|
|
{
|
|
Term t = Deref(ARG1);
|
|
if (IsVarTerm(t)) {
|
|
Error(INSTANTIATION_ERROR,t,"support for coroutining");
|
|
return(FALSE);
|
|
}
|
|
if (IsAtomTerm(t)) return(TRUE);
|
|
restore_regs(t);
|
|
return(TRUE);
|
|
}
|
|
|
|
/* low level voodoo to cut and then restore temporary registers after a call */
|
|
static Int
|
|
p_restore_regs2(void)
|
|
{
|
|
Term t = Deref(ARG1), d0;
|
|
choiceptr pt0;
|
|
if (IsVarTerm(t)) {
|
|
Error(INSTANTIATION_ERROR,t,"support for coroutining");
|
|
return(FALSE);
|
|
}
|
|
if (!IsAtomTerm(t)) {
|
|
restore_regs(t);
|
|
}
|
|
d0 = Deref(ARG2);
|
|
if (IsVarTerm(d0)) {
|
|
Error(INSTANTIATION_ERROR,d0,"support for coroutining");
|
|
return(FALSE);
|
|
}
|
|
#if SBA
|
|
if (!IsIntegerTerm(d0)) {
|
|
#else
|
|
if (!IsIntTerm(d0)) {
|
|
#endif
|
|
return(FALSE);
|
|
}
|
|
#if SBA
|
|
pt0 = (choiceptr)IntegerOfTerm(d0);
|
|
#else
|
|
pt0 = (choiceptr)(LCL0-IntOfTerm(d0));
|
|
#endif
|
|
if (TopB != NULL && YOUNGER_CP(TopB,pt0)) {
|
|
if (DelayedB == NULL || YOUNGER_CP(DelayedB,pt0))
|
|
DelayedB = pt0;
|
|
pt0 = TopB;
|
|
}
|
|
/* find where to cut to */
|
|
if (pt0 > B) {
|
|
/* Wow, we're gonna cut!!! */
|
|
#ifdef YAPOR
|
|
CUT_prune_to((choiceptr) d0);
|
|
#else
|
|
B = pt0;
|
|
#endif /* YAPOR */
|
|
HB = B->cp_h;
|
|
/* trim_trail();*/
|
|
}
|
|
return(TRUE);
|
|
}
|
|
|
|
static Int
|
|
p_clean_ifcp(void) {
|
|
#if SBA
|
|
choiceptr pt0 = (choiceptr)IntegerOfTerm(Deref(ARG1));
|
|
#else
|
|
choiceptr pt0 = (choiceptr)(LCL0-IntOfTerm(Deref(ARG1)));
|
|
#endif
|
|
if (pt0 == B) {
|
|
B = B->cp_b;
|
|
HB = B->cp_h;
|
|
} else {
|
|
pt0->cp_ap = (yamop *)TRUSTFAILCODE;
|
|
}
|
|
return(TRUE);
|
|
}
|
|
|
|
|
|
void
|
|
InitExecFs(void)
|
|
{
|
|
InitCPred("$execute", 1, p_execute, 0);
|
|
InitCPred("$execute_within", 3, p_execute_within, 0);
|
|
InitCPred("$execute", 2, p_at_execute, 0);
|
|
InitCPred("$call_with_args", 1, p_execute_0, 0);
|
|
InitCPred("$call_with_args", 2, p_execute_1, 0);
|
|
InitCPred("$call_with_args", 3, p_execute_2, 0);
|
|
InitCPred("$call_with_args", 4, p_execute_3, 0);
|
|
InitCPred("$call_with_args", 5, p_execute_4, 0);
|
|
InitCPred("$call_with_args", 6, p_execute_5, 0);
|
|
InitCPred("$call_with_args", 7, p_execute_6, 0);
|
|
InitCPred("$call_with_args", 8, p_execute_7, 0);
|
|
InitCPred("$call_with_args", 9, p_execute_8, 0);
|
|
InitCPred("$call_with_args", 10, p_execute_9, 0);
|
|
InitCPred("$call_with_args", 11, p_execute_10, 0);
|
|
#ifdef DEPTH_LIMIT
|
|
InitCPred("$execute_under_depth_limit", 2, p_execute_depth_limit, 0);
|
|
#endif
|
|
InitCPred("$execute0", 1, p_execute0, 0);
|
|
InitCPred("$save_current_choice_point", 1, p_save_cp, 0);
|
|
InitCPred("$pred_goal_expansion_on", 0, p_pred_goal_expansion_on, SafePredFlag);
|
|
InitCPred("$restore_regs", 1, p_restore_regs, SafePredFlag);
|
|
InitCPred("$restore_regs", 2, p_restore_regs2, SafePredFlag);
|
|
InitCPred("$clean_ifcp", 1, p_clean_ifcp, SafePredFlag);
|
|
}
|
|
|