646 lines
16 KiB
C
646 lines
16 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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*************************************************************** f***********
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* *
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File: modules.c *
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* Last rev: *
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* mods: *
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* comments: module support *
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* *
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*************************************************************************/
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#ifdef SCCSLookupSystemModule
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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 "YapHeap.h"
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#include "Yatom.h"
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static Int current_module(USES_REGS1);
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static Int current_module1(USES_REGS1);
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static ModEntry *LookupModule(Term a);
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static ModEntry *LookupSystemModule(Term a);
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static ModEntry *GetModuleEntry(Atom at USES_REGS);
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static ModEntry *FetchModuleEntry(Atom at);
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/**
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* initialize module data-structure
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*
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* @param to parent module (CurrentModule)
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* @param ae module name.
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*
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* @return a new module structure
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*/ /** */
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static ModEntry *initMod(AtomEntry *toname, AtomEntry *ae) {
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CACHE_REGS
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ModEntry *n, *parent;
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if (toname == NULL)
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parent = NULL;
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else {
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parent = FetchModuleEntry(toname);
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}
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n = (ModEntry *)Yap_AllocAtomSpace(sizeof(*n));
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INIT_RWLOCK(n->ModRWLock);
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n->KindOfPE = ModProperty;
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n->PredForME = NULL;
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n->NextME = CurrentModules;
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CurrentModules = n;
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n->AtomOfME = ae;
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n->NextOfPE =NULL;
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n->OwnerFile = Yap_ConsultingFile(PASS_REGS1);
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AddPropToAtom(ae, (PropEntry *)n);
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Yap_setModuleFlags(n, parent);
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return n;
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}
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/**
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* get predicate entry for ap/arity; create it if neccessary
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*
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* @param[in] at
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*
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* @return module descriptorxs
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*/
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static ModEntry *GetModuleEntry(Atom at USES_REGS) {
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Prop p0;
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AtomEntry *ae = RepAtom(at);
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READ_LOCK(ae->ARWLock);
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p0 = ae->PropsOfAE;
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while (p0) {
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ModEntry *me = RepModProp(p0);
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if (me->KindOfPE == ModProperty) {
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READ_UNLOCK(ae->ARWLock);
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return me;
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}
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p0 = me->NextOfPE;
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}
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READ_UNLOCK(ae->ARWLock);
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return initMod(
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(CurrentModule == PROLOG_MODULE ? NULL : AtomOfTerm(CurrentModule)), at);
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}
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/** get entry for ap/arity; assumes one is there. */
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static ModEntry *FetchModuleEntry(Atom at) {
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Prop p0;
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AtomEntry *ae = RepAtom(at);
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READ_LOCK(ae->ARWLock);
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p0 = ae->PropsOfAE;
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while (p0) {
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ModEntry *me = RepModProp(p0);
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if (me->KindOfPE == ModProperty) {
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READ_UNLOCK(ae->ARWLock);
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return me;
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}
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p0 = me->NextOfPE;
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}
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READ_UNLOCK(ae->ARWLock);
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return NULL;
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}
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Term Yap_getUnknownModule(ModEntry *m) {
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if (m && m->flags & UNKNOWN_ERROR) {
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return TermError;
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} else if (m && m->flags & UNKNOWN_WARNING) {
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return TermWarning;
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} else if (m && m->flags & UNKNOWN_FAST_FAIL) {
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return TermFastFail;
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} else {
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return TermFail;
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}
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}
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bool Yap_getUnknown(Term mod) {
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ModEntry *m = LookupModule(mod);
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return Yap_getUnknownModule(m);
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}
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bool Yap_CharacterEscapes(Term mt) {
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CACHE_REGS
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if (mt == PROLOG_MODULE)
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mt = TermProlog;
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return GetModuleEntry(AtomOfTerm(mt) PASS_REGS)->flags & M_CHARESCAPE;
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}
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#define ByteAdr(X) ((char *)&(X))
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Term Yap_Module_Name(PredEntry *ap) {
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CACHE_REGS
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if (!ap)
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return TermUser;
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if (!ap->ModuleOfPred)
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/* If the system predicate is a meta-call I should return the
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module for the metacall, which I will suppose has to be
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reachable from the current module anyway.
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So I will return the current module in case the system
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predicate is a meta-call. Otherwise it will still work.
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*/
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return TermProlog;
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else {
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return ap->ModuleOfPred;
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}
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}
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static ModEntry *LookupSystemModule(Term a) {
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CACHE_REGS
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Atom at;
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ModEntry *me;
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/* prolog module */
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if (a == 0) {
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a = TermProlog;
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}
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at = AtomOfTerm(a);
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me = GetModuleEntry(at PASS_REGS);
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if (!me)
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return NULL;
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me->flags |= M_SYSTEM;
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me->OwnerFile = Yap_ConsultingFile(PASS_REGS1);
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return me;
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}
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static ModEntry *LookupModule(Term a) {
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CACHE_REGS
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Atom at;
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ModEntry *me;
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/* prolog module */
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if (a == 0) {
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return GetModuleEntry(AtomProlog PASS_REGS);
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}
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at = AtomOfTerm(a);
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me = GetModuleEntry(at PASS_REGS);
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return me;
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}
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bool Yap_isSystemModule(Term a) {
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ModEntry *me = LookupModule(a);
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return me != NULL && me->flags & M_SYSTEM;
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}
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Term Yap_Module(Term tmod) {
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LookupModule(tmod);
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return tmod;
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}
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ModEntry *Yap_GetModuleEntry(Term mod) {
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ModEntry *me;
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if (!(me = LookupModule(mod)))
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return NULL;
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return me;
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}
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Term Yap_GetModuleFromEntry(ModEntry *me) {
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return MkAtomTerm(me->AtomOfME);
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;
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}
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struct pred_entry *Yap_ModulePred(Term mod) {
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ModEntry *me;
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if (!(me = LookupModule(mod)))
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return NULL;
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return me->PredForME;
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}
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void Yap_NewModulePred(Term mod, struct pred_entry *ap) {
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ModEntry *me;
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if (mod == 0)
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mod = TermProlog;
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if (!(me = LookupModule(mod)))
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return;
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WRITE_LOCK(me->ModRWLock);
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ap->NextPredOfModule = me->PredForME;
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me->PredForME = ap;
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WRITE_UNLOCK(me->ModRWLock);
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}
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static Int
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current_module(USES_REGS1) { /* $current_module(Old,N) */
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Term t;
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if (CurrentModule) {
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if (!Yap_unify_constant(ARG1, CurrentModule))
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return FALSE;
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} else {
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if (!Yap_unify_constant(ARG1, TermProlog))
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return FALSE;
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}
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t = Deref(ARG2);
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if (IsVarTerm(t) || !IsAtomTerm(t))
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return FALSE;
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if (t == TermProlog) {
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CurrentModule = PROLOG_MODULE;
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} else {
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// make it very clear that t inherits from cm.
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LookupModule(t);
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CurrentModule = t;
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}
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LOCAL_SourceModule = CurrentModule;
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return TRUE;
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}
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static Int change_module(USES_REGS1) { /* $change_module(N) */
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Term mod = Deref(ARG1);
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LookupModule(mod);
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CurrentModule = mod;
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LOCAL_SourceModule = mod;
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return TRUE;
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}
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static Int current_module1(USES_REGS1) { /* $current_module(Old)
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*/
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if (CurrentModule)
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return Yap_unify_constant(ARG1, CurrentModule);
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return Yap_unify_constant(ARG1, TermProlog);
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}
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static Int cont_current_module(USES_REGS1) {
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ModEntry *imod = AddressOfTerm(EXTRA_CBACK_ARG(1, 1)), *next;
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Term t = MkAtomTerm(imod->AtomOfME);
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next = imod->NextME;
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/* ARG1 is unbound */
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Yap_unify(ARG1, t);
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if (!next)
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cut_succeed();
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EXTRA_CBACK_ARG(1, 1) = MkAddressTerm(next);
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return TRUE;
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}
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static Int init_current_module(
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USES_REGS1) { /* current_module(?ModuleName) */
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Term t = Deref(ARG1);
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if (!IsVarTerm(t)) {
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if (!IsAtomTerm(t)) {
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Yap_Error(TYPE_ERROR_ATOM, t, "module name must be an atom");
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return FALSE;
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}
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if (FetchModuleEntry(AtomOfTerm(t)) != NULL)
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cut_succeed();
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cut_fail();
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}
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EXTRA_CBACK_ARG(1, 1) = MkIntegerTerm((Int)CurrentModules);
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return cont_current_module(PASS_REGS1);
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}
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static Int cont_ground_module(USES_REGS1) {
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ModEntry *imod = AddressOfTerm(EXTRA_CBACK_ARG(3, 1)), *next;
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Term t2 = MkAtomTerm(imod->AtomOfME);
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next = imod->NextME;
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/* ARG2 is unbound */
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if (!next)
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cut_succeed();
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EXTRA_CBACK_ARG(3, 1) = MkAddressTerm(next);
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return Yap_unify(ARG2, t2);
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}
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static Int init_ground_module(USES_REGS1) {
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/* current_module(?ModuleName) */
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Term t1 = Deref(ARG1), tmod = CurrentModule, t3;
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if (tmod == PROLOG_MODULE) {
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tmod = TermProlog;
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}
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t3 = Yap_YapStripModule(t1, &tmod);
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if (!t3) {
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Yap_Error(TYPE_ERROR_CALLABLE, t3, "trying to obtain module");
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return FALSE;
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}
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if (!IsVarTerm(tmod)) {
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if (!IsAtomTerm(tmod)) {
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Yap_Error(TYPE_ERROR_ATOM, tmod, "module name must be an atom");
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cut_fail();
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}
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if (FetchModuleEntry(AtomOfTerm(tmod)) != NULL && Yap_unify(tmod, ARG2) &&
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Yap_unify(t3, ARG3)) {
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cut_succeed();
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}
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cut_fail();
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}
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if (!Yap_unify(ARG2, tmod) || !Yap_unify(ARG3, t3)) {
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cut_fail();
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}
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// make sure we keep the binding
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B->cp_tr = TR;
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B->cp_h = HR;
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EXTRA_CBACK_ARG(3, 1) = MkAddressTerm(CurrentModules);
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return cont_ground_module(PASS_REGS1);
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}
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/**
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* @pred system_module( + _Mod_)
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*
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* @param module
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*
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* @return
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*/
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static Int is_system_module(USES_REGS1) {
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Term t;
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if (IsVarTerm(t = Deref(ARG1))) {
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return false;
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}
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if (!IsAtomTerm(t)) {
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Yap_Error(TYPE_ERROR_ATOM, t, "load_files/2");
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return false;
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}
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return Yap_isSystemModule(t);
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}
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static Int new_system_module(USES_REGS1) {
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ModEntry *me;
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Term t;
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if (IsVarTerm(t = Deref(ARG1))) {
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Yap_Error(INSTANTIATION_ERROR, t, NULL);
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return false;
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}
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if (!IsAtomTerm(t)) {
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Yap_Error(TYPE_ERROR_ATOM, t, NULL);
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return false;
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}
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if ((me = LookupSystemModule(t)))
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me->OwnerFile = Yap_ConsultingFile(PASS_REGS1);
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return me != NULL;
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}
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static Int strip_module(USES_REGS1) {
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Term t1 = Deref(ARG1), tmod = CurrentModule;
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if (tmod == PROLOG_MODULE) {
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tmod = TermProlog;
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}
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t1 = Yap_StripModule(t1, &tmod);
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if (!t1) {
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Yap_Error(TYPE_ERROR_CALLABLE, t1, "trying to obtain module");
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return FALSE;
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}
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return Yap_unify(ARG3, t1) && Yap_unify(ARG2, tmod);
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}
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static Int yap_strip_clause(USES_REGS1) {
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Term t1 = Deref(ARG1), tmod = LOCAL_SourceModule;
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if (tmod == PROLOG_MODULE) {
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tmod = TermProlog;
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}
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t1 = Yap_StripModule(t1, &tmod);
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if (IsVarTerm(t1) || IsVarTerm(tmod)) {
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Yap_Error(INSTANTIATION_ERROR, t1, "trying to obtain module");
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return false;
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} else if (IsApplTerm(t1)) {
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Functor f = FunctorOfTerm(t1);
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if (IsExtensionFunctor(f)) {
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Yap_Error(TYPE_ERROR_CALLABLE, t1, "trying to obtain module");
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return false;
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}
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if (f == FunctorAssert || f == FunctorDoubleArrow) {
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Term thmod = tmod;
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Term th = ArgOfTerm(1, t1);
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th = Yap_StripModule(th, &thmod);
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if (IsVarTerm(th)) {
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Yap_Error(INSTANTIATION_ERROR, t1, "trying to obtain module");
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return false;
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} else if (IsVarTerm(thmod)) {
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Yap_Error(INSTANTIATION_ERROR, thmod, "trying to obtain module");
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return false;
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} else if (IsIntTerm(th) || (IsApplTerm(th) && IsExtensionFunctor(FunctorOfTerm(t1)))) {
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Yap_Error(TYPE_ERROR_CALLABLE, t1, "trying to obtain module");
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return false;
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}else if (!IsAtomTerm(thmod)) {
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Yap_Error(TYPE_ERROR_ATOM, thmod, "trying to obtain module");
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return false;
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}
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}
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} else if (IsIntTerm(t1) || IsIntTerm(tmod) ) {
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Yap_Error(TYPE_ERROR_CALLABLE, t1, "trying to obtain module");
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return false;
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}
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return Yap_unify(ARG3, t1) && Yap_unify(ARG2, tmod);
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}
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Term Yap_YapStripModule(Term t, Term *modp) {
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CACHE_REGS
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Term tmod;
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if (modp) {
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tmod = *modp;
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if (tmod == PROLOG_MODULE) {
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*modp = tmod = TermProlog;
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}
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} else {
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tmod = CurrentModule;
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if (tmod == PROLOG_MODULE) {
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tmod = TermProlog;
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}
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}
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restart:
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if (IsVarTerm(t) || !IsApplTerm(t)) {
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if (modp)
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*modp = tmod;
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return t;
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} else {
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Functor fun = FunctorOfTerm(t);
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if (fun == FunctorModule) {
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Term t1 = ArgOfTerm(1, t);
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tmod = t1;
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if (!IsVarTerm(tmod) && !IsAtomTerm(tmod)) {
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if (modp)
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*modp = tmod;
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return t;
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}
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t = ArgOfTerm(2, t);
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goto restart;
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}
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if (modp)
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*modp = tmod;
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return t;
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}
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return 0L;
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}
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static Int yap_strip_module(USES_REGS1) {
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Term t1 = Deref(ARG1), tmod = CurrentModule;
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if (tmod == PROLOG_MODULE) {
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tmod = TermProlog;
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}
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t1 = Yap_YapStripModule(t1, &tmod);
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if (!t1 || (!IsVarTerm(tmod) && !IsAtomTerm(tmod))) {
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Yap_Error(TYPE_ERROR_CALLABLE, t1, "trying to obtain module");
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return FALSE;
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}
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return Yap_unify(ARG3, t1) && Yap_unify(ARG2, tmod);
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}
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static Int context_module(USES_REGS1) {
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yamop *parentcp = P;
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CELL *yenv;
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PredEntry *ap = EnvPreg(parentcp);
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if (ap->ModuleOfPred && !(ap->PredFlags & MetaPredFlag))
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return Yap_unify(ARG1, ap->ModuleOfPred);
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parentcp = CP;
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yenv = ENV;
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do {
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ap = EnvPreg(parentcp);
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if (ap->ModuleOfPred && !(ap->PredFlags & MetaPredFlag))
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return Yap_unify(ARG1, ap->ModuleOfPred);
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parentcp = (yamop *)yenv[E_CP];
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yenv = (CELL *)yenv[E_E];
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} while (yenv);
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return Yap_unify(ARG1, CurrentModule);
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}
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/**
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* @pred source_module(-Mod)
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*
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* @param Mod is the current text source module.
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*
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* : _Mod_ is the current read-in or source module.
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*/
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static Int source_module(USES_REGS1) {
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if (LOCAL_SourceModule == PROLOG_MODULE) {
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return Yap_unify(ARG1, TermProlog);
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}
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return Yap_unify(ARG1, LOCAL_SourceModule);
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}
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/**
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* @pred source_module(-Mod)
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*
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* @param Mod is the current text source module.
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*
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* : _Mod_ is the current read-in or source module.
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*/
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static Int current_source_module(USES_REGS1) {
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Term t;
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if (LOCAL_SourceModule == PROLOG_MODULE) {
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LOCAL_SourceModule = TermProlog;
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}
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if (!Yap_unify(ARG1, LOCAL_SourceModule)) {
|
|
return false;
|
|
};
|
|
if (IsVarTerm(t = Deref(ARG2))) {
|
|
Yap_Error(INSTANTIATION_ERROR, t, NULL);
|
|
return false;
|
|
}
|
|
if (!IsAtomTerm(t)) {
|
|
Yap_Error(TYPE_ERROR_ATOM, t, NULL);
|
|
return false;
|
|
}
|
|
LOCAL_SourceModule = t;
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* @pred $copy_operators(+Mode, +ModTarget)
|
|
*
|
|
* Copy all operators in ModSource to ModTarget
|
|
*
|
|
* : _Mod_ is the current read-in or source module.
|
|
*/
|
|
static Int copy_operators(USES_REGS1) {
|
|
ModEntry *me = LookupModule(Deref(ARG1));
|
|
if (!me)
|
|
return true;
|
|
ModEntry *she = LookupModule(Deref(ARG2));
|
|
if (!she)
|
|
return true;
|
|
OpEntry *op = me->OpForME;
|
|
while (op) {
|
|
if (!Yap_dup_op(op, she)) {
|
|
return false;
|
|
}
|
|
op = op->NextForME;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
Term Yap_StripModule(Term t, Term *modp) {
|
|
CACHE_REGS
|
|
Term tmod;
|
|
|
|
if (modp)
|
|
tmod = *modp;
|
|
else {
|
|
tmod = CurrentModule;
|
|
if (tmod == PROLOG_MODULE) {
|
|
tmod = TermProlog;
|
|
}
|
|
}
|
|
restart:
|
|
if (IsVarTerm(t) || !IsApplTerm(t)) {
|
|
if (modp)
|
|
*modp = tmod;
|
|
return t;
|
|
} else {
|
|
Functor fun = FunctorOfTerm(t);
|
|
if (fun == FunctorModule) {
|
|
Term t1 = ArgOfTerm(1, t);
|
|
if (IsVarTerm(t1)) {
|
|
*modp = tmod;
|
|
return t;
|
|
}
|
|
tmod = t1;
|
|
if (!IsVarTerm(tmod) && !IsAtomTerm(tmod)) {
|
|
return 0L;
|
|
}
|
|
t = ArgOfTerm(2, t);
|
|
goto restart;
|
|
}
|
|
if (modp)
|
|
*modp = tmod;
|
|
return t;
|
|
}
|
|
return 0L;
|
|
}
|
|
|
|
void Yap_InitModulesC(void) {
|
|
Yap_InitCPred("$current_module", 2, current_module,
|
|
SafePredFlag | SyncPredFlag);
|
|
Yap_InitCPred("$current_module", 1, current_module1,
|
|
SafePredFlag | SyncPredFlag);
|
|
Yap_InitCPred("$change_module", 1, change_module,
|
|
SafePredFlag | SyncPredFlag);
|
|
Yap_InitCPred("strip_module", 3, strip_module, SafePredFlag | SyncPredFlag);
|
|
Yap_InitCPred("$yap_strip_module", 3, yap_strip_module, SafePredFlag | SyncPredFlag);
|
|
Yap_InitCPred("source_module", 1, source_module, SafePredFlag | SyncPredFlag);
|
|
Yap_InitCPred("current_source_module", 2, current_source_module,
|
|
SafePredFlag | SyncPredFlag);
|
|
Yap_InitCPred("$yap_strip_clause", 3, yap_strip_clause,
|
|
SafePredFlag | SyncPredFlag);
|
|
Yap_InitCPred("context_module", 1, context_module, 0);
|
|
Yap_InitCPred("$is_system_module", 1, is_system_module, SafePredFlag);
|
|
Yap_InitCPred("$copy_operators", 2, copy_operators, 0);
|
|
Yap_InitCPred("new_system_module", 1, new_system_module, SafePredFlag);
|
|
Yap_InitCPredBack("$all_current_modules", 1, 1, init_current_module,
|
|
cont_current_module, SafePredFlag | SyncPredFlag);
|
|
Yap_InitCPredBack("$ground_module", 3, 1, init_ground_module,
|
|
cont_ground_module, SafePredFlag | SyncPredFlag);
|
|
}
|
|
|
|
void Yap_InitModules(void) {
|
|
CACHE_REGS
|
|
LookupSystemModule(MkAtomTerm(AtomProlog));
|
|
LOCAL_SourceModule = MkAtomTerm(AtomProlog);
|
|
LookupModule(USER_MODULE);
|
|
LookupModule(IDB_MODULE);
|
|
LookupModule(ATTRIBUTES_MODULE);
|
|
LookupSystemModule(CHARSIO_MODULE);
|
|
LookupSystemModule(TERMS_MODULE);
|
|
LookupSystemModule(SYSTEM_MODULE);
|
|
LookupSystemModule(READUTIL_MODULE);
|
|
LookupSystemModule(HACKS_MODULE);
|
|
LookupModule(ARG_MODULE);
|
|
LookupSystemModule(GLOBALS_MODULE);
|
|
LookupSystemModule(DBLOAD_MODULE);
|
|
LookupSystemModule(RANGE_MODULE);
|
|
CurrentModule = PROLOG_MODULE;
|
|
}
|