721 lines
21 KiB
C
721 lines
21 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: errors.c *
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* Last Rev: *
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* Mods: *
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* Comments: Yap'S error handlers *
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* *
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*************************************************************************/
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#include "absmi.h"
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#include "yapio.h"
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#if HAVE_STDARG_H
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#include <stdarg.h>
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#endif
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#include <stdlib.h>
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#if HAVE_STRING_H
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#include <string.h>
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#endif
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#include "Foreign.h"
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#if DEBUG
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void Yap_PrintPredName(PredEntry *ap) {
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CACHE_REGS
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Term tmod = ap->ModuleOfPred;
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if (!tmod)
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tmod = TermProlog;
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#if THREADS
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Yap_DebugPlWrite(MkIntegerTerm(worker_id));
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Yap_DebugPutc(stderr, ' ');
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#endif
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Yap_DebugPutc(stderr, '>');
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Yap_DebugPutc(stderr, '\t');
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Yap_DebugPlWrite(tmod);
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Yap_DebugPutc(stderr, ':');
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if (ap->ModuleOfPred == IDB_MODULE) {
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Term t = Deref(ARG1);
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if (IsAtomTerm(t)) {
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Yap_DebugPlWrite(t);
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} else if (IsIntegerTerm(t)) {
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Yap_DebugPlWrite(t);
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} else {
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Functor f = FunctorOfTerm(t);
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Atom At = NameOfFunctor(f);
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Yap_DebugPlWrite(MkAtomTerm(At));
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Yap_DebugPutc(stderr, '/');
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Yap_DebugPlWrite(MkIntegerTerm(ArityOfFunctor(f)));
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}
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} else {
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if (ap->ArityOfPE == 0) {
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Atom At = (Atom)ap->FunctorOfPred;
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Yap_DebugPlWrite(MkAtomTerm(At));
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} else {
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Functor f = ap->FunctorOfPred;
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Atom At = NameOfFunctor(f);
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Yap_DebugPlWrite(MkAtomTerm(At));
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Yap_DebugPutc(stderr, '/');
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Yap_DebugPlWrite(MkIntegerTerm(ArityOfFunctor(f)));
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}
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}
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char s[1024];
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if (ap->PredFlags & StandardPredFlag)
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fprintf(stderr, "S");
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if (ap->PredFlags & CPredFlag)
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fprintf(stderr, "C");
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if (ap->PredFlags & UserCPredFlag)
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fprintf(stderr, "U");
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if (ap->PredFlags & SyncPredFlag)
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fprintf(stderr, "Y");
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if (ap->PredFlags & LogUpdatePredFlag)
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fprintf(stderr, "Y");
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if (ap->PredFlags & HiddenPredFlag)
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fprintf(stderr, "H");
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sprintf(s, " %llx\n", ap->PredFlags);
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Yap_DebugPuts(stderr, s);
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}
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#endif
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bool Yap_Warning(const char *s, ...) {
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CACHE_REGS
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va_list ap;
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PredEntry *pred;
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bool rc;
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Term ts[2];
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const char *format;
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char tmpbuf[MAXPATHLEN];
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if (LOCAL_within_print_message) {
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/* error within error */
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fprintf(stderr, "%% WARNING WITHIN WARNING\n");
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Yap_RestartYap(1);
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}
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LOCAL_DoingUndefp = true;
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LOCAL_within_print_message = true;
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pred = RepPredProp(PredPropByFunc(FunctorPrintMessage,
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PROLOG_MODULE)); // PROCEDURE_print_message2
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va_start(ap, s);
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format = va_arg(ap, char *);
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if (format != NULL) {
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#if HAVE_VSNPRINTF
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vsnprintf(tmpbuf, MAXPATHLEN - 1, format, ap);
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#else
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(void)vsprintf(tmpbuf, format, ap);
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#endif
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} else
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return false;
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va_end(ap);
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if (pred->OpcodeOfPred == UNDEF_OPCODE||
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pred->OpcodeOfPred == FAIL_OPCODE) {
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fprintf(stderr, "warning message: %s\n", tmpbuf);
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LOCAL_DoingUndefp = false;
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LOCAL_within_print_message = false;
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return false;
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}
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ts[1] = MkAtomTerm(AtomWarning);
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ts[0] = MkAtomTerm(Yap_LookupAtom(tmpbuf));
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rc = Yap_execute_pred(pred, ts, true PASS_REGS);
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return rc;
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}
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bool Yap_PrintWarning(Term twarning) {
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CACHE_REGS
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PredEntry *pred = RepPredProp(PredPropByFunc(
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FunctorPrintMessage, PROLOG_MODULE)); // PROCEDURE_print_message2;
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Term cmod = ( CurrentModule == PROLOG_MODULE ? TermProlog : CurrentModule );
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bool rc;
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Term ts[2];
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if (LOCAL_within_print_message) {
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/* error within error */
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fprintf(stderr, "%% WARNING WITHIN WARNING\n");
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Yap_RestartYap(1);
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}
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LOCAL_DoingUndefp = true;
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LOCAL_within_print_message = true;
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if (pred->OpcodeOfPred == UNDEF_OPCODE ||
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pred->OpcodeOfPred == FAIL_OPCODE
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) {
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fprintf(stderr, "warning message:\n");
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Yap_DebugPlWrite(twarning);
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fprintf(stderr, "\n");
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LOCAL_DoingUndefp = false;
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LOCAL_within_print_message = false;
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CurrentModule = cmod;
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return false;
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}
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ts[1] = twarning;
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ts[0] = MkAtomTerm(AtomWarning);
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HB = B->cp_h = HR;
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B->cp_tr = TR;
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rc = Yap_execute_pred(pred, ts, true PASS_REGS);
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LOCAL_within_print_message = false;
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LOCAL_DoingUndefp = false;
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return rc;
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}
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bool Yap_HandleError__(const char *file, const char *function, int lineno, const char *s, ...) {
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CACHE_REGS
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yap_error_number err = LOCAL_Error_TYPE;
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const char *serr;
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LOCAL_Error_TYPE = YAP_NO_ERROR;
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if (LOCAL_ErrorMessage) {
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serr = LOCAL_ErrorMessage;
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} else {
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serr = s;
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}
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switch (err) {
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case RESOURCE_ERROR_STACK:
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if (!Yap_gc(2, ENV, gc_P(P, CP))) {
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Yap_Error__(file, function, lineno, RESOURCE_ERROR_STACK, ARG1, serr);
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return false;
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}
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return true;
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case RESOURCE_ERROR_AUXILIARY_STACK:
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if (LOCAL_MAX_SIZE < (char *)AuxSp - AuxBase) {
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LOCAL_MAX_SIZE += 1024;
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}
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if (!Yap_ExpandPreAllocCodeSpace(0, NULL, TRUE)) {
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/* crash in flames */
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Yap_Error__(file, function, lineno, RESOURCE_ERROR_AUXILIARY_STACK, ARG1, serr);
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return false;
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}
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return true;
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case RESOURCE_ERROR_HEAP:
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if (!Yap_growheap(FALSE, 0, NULL)) {
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Yap_Error__(file, function, lineno, RESOURCE_ERROR_HEAP, ARG2, serr);
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return false;
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}
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default:
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Yap_Error__(file, function, lineno, err, LOCAL_Error_Term, serr);
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return false;
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}
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}
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int Yap_SWIHandleError(const char *s, ...) {
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CACHE_REGS
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yap_error_number err = LOCAL_Error_TYPE;
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char *serr;
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LOCAL_Error_TYPE = YAP_NO_ERROR;
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if (LOCAL_ErrorMessage) {
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serr = LOCAL_ErrorMessage;
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} else {
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serr = (char *)s;
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}
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switch (err) {
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case RESOURCE_ERROR_STACK:
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if (!Yap_gc(2, ENV, gc_P(P, CP))) {
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Yap_Error(RESOURCE_ERROR_STACK, TermNil, serr);
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return (FALSE);
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}
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return TRUE;
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case RESOURCE_ERROR_AUXILIARY_STACK:
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if (LOCAL_MAX_SIZE < (char *)AuxSp - AuxBase) {
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LOCAL_MAX_SIZE += 1024;
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}
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if (!Yap_ExpandPreAllocCodeSpace(0, NULL, TRUE)) {
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/* crash in flames */
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Yap_Error(RESOURCE_ERROR_AUXILIARY_STACK, ARG1, serr);
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return FALSE;
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}
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return TRUE;
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case RESOURCE_ERROR_HEAP:
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if (!Yap_growheap(FALSE, 0, NULL)) {
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Yap_Error(RESOURCE_ERROR_HEAP, ARG2, serr);
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return FALSE;
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}
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default:
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Yap_Error(err, LOCAL_Error_Term, serr);
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return (FALSE);
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}
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}
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void Yap_RestartYap(int flag) {
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CACHE_REGS
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#if PUSH_REGS
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restore_absmi_regs(&Yap_standard_regs);
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#endif
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siglongjmp(LOCAL_RestartEnv, 1);
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}
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static void error_exit_yap(int value) {
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CACHE_REGS
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if (!(LOCAL_PrologMode & BootMode)) {
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#if DEBUG
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#endif
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}
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fprintf(stderr, "\n Exiting ....\n");
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Yap_exit(value);
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}
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/* This needs to be a static because I can't trust the stack (WIN32), and
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I can't trust the Yap stacks (error) */
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#define YAP_BUF_SIZE 512
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static char tmpbuf[YAP_BUF_SIZE];
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// error classes: based on OSI errors.
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//
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// - The extra argument says whether there different instances
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//
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// - Events are treated within the same pipeline as errors.
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//
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#undef BEGIN_ERROR_CLASSES
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#undef ECLASS
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#undef END_ERROR_CLASSES
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#undef BEGIN_ERRORS
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#undef E0
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#undef E
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#undef E2
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#undef END_ERRORS
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#define BEGIN_ERROR_CLASSES() \
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static Term mkerrorct(yap_error_class_number c, Term *ts) { \
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switch (c) {
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#define ECLASS(CL, A, B) \
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case CL: \
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if (A == 0) \
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return MkAtomTerm(Yap_LookupAtom(A)); \
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else { \
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return Yap_MkApplTerm(Yap_MkFunctor(Yap_LookupAtom(A), B), B, ts); \
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}
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#define END_ERROR_CLASSES() \
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} \
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}
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#define BEGIN_ERRORS() \
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static Term mkerrort(yap_error_number e, Term *ts) { \
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switch (e) {
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#define E0(A, B) \
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case A: \
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return mkerrorct(B, ts);
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#define E(A, B, C) \
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case A: \
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ts -= 1; \
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ts[0] = MkAtomTerm(Yap_LookupAtom(C)); \
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return mkerrorct(B, ts);
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#define E2(A, B, C, D) \
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case A: \
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ts -= 2; \
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ts[0] = MkAtomTerm(Yap_LookupAtom(C)); \
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ts[1] = MkAtomTerm(Yap_LookupAtom(D)); \
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return mkerrorct(B, ts);
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#define END_ERRORS() \
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} \
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}
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#include "YapErrors.h"
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/**
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* @brief Yap_Error
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* This function handles errors in the C code. Check errors.yap for the
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*corresponding Prolog code.
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*
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* @param file C source
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* @param function C function
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* @param lineno C exact line
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* @param type the error ID (in YAP this is a single integer)
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* @param where the culprit
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* @return usually FAILCODE
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*
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* In a good day, the error handler's job is to generate a throw. This includes:
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* - constructing an ISO style error term;
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* - constructing a list with all available info on the bug
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* - generating the throw
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* - forcing backtracking in order to restart.
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*
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* In a bad day, it has to deal with OOM, abort, and errors within errorts.
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*
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* The list includes the following options:
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* + c=c(file, line, function): where the bug was detected;
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*
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* + e=p(mod, name, arity, cl, file, lin): where the code was entered;
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*
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* + p=p(mod, name, arity, cl, file, line): the prolog procedure that caused
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*the bug,
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*and optionally,
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*
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* + g=g(Goal): the goal that created this mess
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*
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* + i=i(Comment): an user-written comment on this bug.
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*/
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yamop *Yap_Error__(const char *file, const char *function, int lineno,
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yap_error_number type, Term where, ...) {
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CACHE_REGS
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va_list ap;
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CELL nt[3];
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Functor fun;
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bool serious;
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Term tf, error_t, comment, culprit = TermNil;
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char *format;
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char s[MAXPATHLEN];
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/* disallow recursive error handling */
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if (LOCAL_PrologMode & InErrorMode) {
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fprintf(stderr, "%% ERROR WITHIN ERROR %d: %s\n", LOCAL_CurrentError,
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tmpbuf);
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Yap_RestartYap(1);
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}
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LOCAL_PrologMode |= InErrorMode;
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LOCAL_Error_TYPE = YAP_NO_ERROR;
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Yap_ClearExs();
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if (where == 0L) {
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where = TermNil;
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}
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// first, obtain current location
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sprintf(LOCAL_FileNameBuf, "%s:%d in C-function %s ", file, lineno, function);
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tf = MkAtomTerm(Yap_LookupAtom(LOCAL_FileNameBuf));
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#if DEBUG_STRICT
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if (Yap_heap_regs && !(LOCAL_PrologMode & BootMode))
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fprintf(stderr, "***** Processing Error %d (%lx,%x) %s***\n", type,
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(unsigned long int)LOCAL_Signals, LOCAL_PrologMode, format);
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else
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fprintf(stderr, "***** Processing Error %d (%x) %s***\n", type,
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LOCAL_PrologMode, format);
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#endif
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if (type == INTERRUPT_EVENT) {
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fprintf(stderr, "%% YAP exiting: cannot handle signal %d\n",
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(int)IntOfTerm(where));
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LOCAL_PrologMode &= ~InErrorMode;
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Yap_exit(1);
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}
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if (LOCAL_within_print_message) {
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/* error within error */
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fprintf(stderr, "%% ERROR WITHIN WARNING %d: %s\n", LOCAL_CurrentError,
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tmpbuf);
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LOCAL_PrologMode &= ~InErrorMode;
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Yap_exit(1);
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}
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va_start(ap, where);
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format = va_arg(ap, char *);
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if (format != NULL) {
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#if HAVE_VSNPRINTF
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(void)vsnprintf(s, MAXPATHLEN - 1, format, ap);
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#else
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(void)vsprintf(s, format, ap);
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#endif
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// fprintf(stderr, "warning: ");
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comment = MkAtomTerm(Yap_LookupAtom(s));
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} else if (LOCAL_ErrorSay && LOCAL_ErrorSay[0]) {
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comment = MkAtomTerm(Yap_LookupAtom(LOCAL_ErrorSay));
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} else {
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comment = TermNil;
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}
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va_end(ap);
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if (P == (yamop *)(FAILCODE)) {
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LOCAL_PrologMode &= ~InErrorMode;
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return P;
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}
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/* PURE_ABORT may not have set where correctly, BootMode may not have the data
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* terms ready */
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if (type == ABORT_EVENT || LOCAL_PrologMode & BootMode) {
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where = TermNil;
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LOCAL_PrologMode &= ~AbortMode;
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LOCAL_CurrentError = type;
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LOCAL_PrologMode |= InErrorMode;
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/* make sure failure will be seen at next port */
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// no need to lock & unlock
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if (LOCAL_PrologMode & AsyncIntMode)
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Yap_signal(YAP_FAIL_SIGNAL);
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P = FAILCODE;
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} else {
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if (IsVarTerm(where)) {
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/* we must be careful someone gave us a copy to a local variable */
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Term t = MkVarTerm();
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Yap_unify(t, where);
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where = Deref(where);
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}
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/* Exit Abort Mode, if we were there */
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LOCAL_PrologMode &= ~AbortMode;
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LOCAL_CurrentError = type;
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LOCAL_PrologMode |= InErrorMode;
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if (!(where = Yap_CopyTerm(where))) {
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where = TermNil;
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}
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}
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if (LOCAL_PrologMode & BootMode) {
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/* crash in flames! */
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fprintf(stderr, "%s:%d:0 YAP Fatal Error %d in function %s:\n %s exiting....\n", file, lineno, type, function, s);
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error_exit_yap(1);
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}
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#ifdef DEBUG
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// DumpActiveGoals( USES_REGS1 );
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#endif /* DEBUG */
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if (!IsVarTerm(where) &&
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IsApplTerm(where) &&
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FunctorOfTerm(where) == FunctorError) {
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error_t = where;
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Yap_JumpToEnv(error_t);
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P = (yamop *)FAILCODE;
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LOCAL_PrologMode &= ~InErrorMode;
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return P;
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}
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switch (type) {
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case SYSTEM_ERROR_INTERNAL: {
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fprintf(stderr, "%% Internal YAP Error: %s exiting....\n", tmpbuf);
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serious = TRUE;
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if (LOCAL_PrologMode & BootMode) {
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fprintf(stderr, "%% YAP crashed while booting %s\n", tmpbuf);
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} else {
|
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Yap_detect_bug_location(P, FIND_PRED_FROM_ANYWHERE, YAP_BUF_SIZE);
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fprintf(stderr, "%% Bug found while executing %s\n", tmpbuf);
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}
|
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error_exit_yap(1);
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}
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case SYSTEM_ERROR_FATAL: {
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fprintf(stderr, "%% Fatal YAP Error: %s exiting....\n", tmpbuf);
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error_exit_yap(1);
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}
|
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case INTERRUPT_EVENT: {
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error_exit_yap(1);
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}
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case ABORT_EVENT:
|
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nt[0] = MkAtomTerm(AtomDAbort);
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fun = FunctorDollarVar;
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serious = TRUE;
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break;
|
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case CALL_COUNTER_UNDERFLOW_EVENT:
|
|
/* Do a long jump */
|
|
LOCAL_ReductionsCounterOn = FALSE;
|
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LOCAL_PredEntriesCounterOn = FALSE;
|
|
LOCAL_RetriesCounterOn = FALSE;
|
|
Yap_JumpToEnv(MkAtomTerm(AtomCallCounter));
|
|
P = (yamop *)FAILCODE;
|
|
LOCAL_PrologMode &= ~InErrorMode;
|
|
return (P);
|
|
case PRED_ENTRY_COUNTER_UNDERFLOW_EVENT:
|
|
/* Do a long jump */
|
|
LOCAL_ReductionsCounterOn = FALSE;
|
|
LOCAL_PredEntriesCounterOn = FALSE;
|
|
LOCAL_RetriesCounterOn = FALSE;
|
|
Yap_JumpToEnv(MkAtomTerm(AtomCallAndRetryCounter));
|
|
P = (yamop *)FAILCODE;
|
|
LOCAL_PrologMode &= ~InErrorMode;
|
|
return (P);
|
|
case RETRY_COUNTER_UNDERFLOW_EVENT:
|
|
/* Do a long jump */
|
|
LOCAL_ReductionsCounterOn = FALSE;
|
|
LOCAL_PredEntriesCounterOn = FALSE;
|
|
LOCAL_RetriesCounterOn = FALSE;
|
|
Yap_JumpToEnv(MkAtomTerm(AtomRetryCounter));
|
|
P = (yamop *)FAILCODE;
|
|
LOCAL_PrologMode &= ~InErrorMode;
|
|
return (P);
|
|
default: {
|
|
Term ts[3];
|
|
ts[2] = where;
|
|
nt[0] = mkerrort(type, ts + 2);
|
|
}
|
|
|
|
|
|
|
|
}
|
|
if (type != ABORT_EVENT) {
|
|
Term location;
|
|
|
|
/* This is used by some complex procedures to detect there was an error */
|
|
if (IsAtomTerm(nt[0])) {
|
|
strncpy(LOCAL_ErrorSay, (char *) RepAtom(AtomOfTerm(nt[0]))->StrOfAE,
|
|
MAX_ERROR_MSG_SIZE);
|
|
LOCAL_ErrorMessage = LOCAL_ErrorSay;
|
|
} else {
|
|
strncpy(LOCAL_ErrorSay,
|
|
(char *) RepAtom(NameOfFunctor(FunctorOfTerm(nt[0])))->StrOfAE,
|
|
MAX_ERROR_MSG_SIZE);
|
|
LOCAL_ErrorMessage = LOCAL_ErrorSay;
|
|
}
|
|
nt[1] = TermNil;
|
|
switch (type) {
|
|
case RESOURCE_ERROR_HEAP:
|
|
case RESOURCE_ERROR_STACK:
|
|
case RESOURCE_ERROR_TRAIL:
|
|
comment = MkAtomTerm(Yap_LookupAtom(tmpbuf));
|
|
default:
|
|
if (comment != TermNil)
|
|
nt[1] = MkPairTerm(MkPairTerm(MkAtomTerm(Yap_LookupAtom("i")), comment),
|
|
nt[1]);
|
|
if (file && function) {
|
|
Term ts[3], t3;
|
|
ts[0] = MkAtomTerm(Yap_LookupAtom(file));
|
|
ts[1] = MkIntegerTerm(lineno);
|
|
ts[2] = MkAtomTerm(Yap_LookupAtom(function));
|
|
t3 = Yap_MkApplTerm(Yap_MkFunctor(Yap_LookupAtom("c"), 3), 3, ts);
|
|
nt[1] =
|
|
MkPairTerm(MkPairTerm(MkAtomTerm(Yap_LookupAtom("c")), t3), nt[1]);
|
|
}
|
|
if ((location = Yap_pc_location(P, B, ENV)) != TermNil) {
|
|
nt[1] = MkPairTerm(MkPairTerm(MkAtomTerm(Yap_LookupAtom("p")), location),
|
|
nt[1]);
|
|
}
|
|
if ((location = Yap_env_location(CP, B, ENV, 0)) != TermNil) {
|
|
nt[1] = MkPairTerm(MkPairTerm(MkAtomTerm(Yap_LookupAtom("e")), location),
|
|
nt[1]);
|
|
}
|
|
}
|
|
}
|
|
/* disable active signals at this point */
|
|
LOCAL_Signals = 0;
|
|
CalculateStackGap(PASS_REGS1);
|
|
LOCAL_PrologMode &= ~InErrorMode;
|
|
/* we might be in the middle of a critical region */
|
|
if (LOCAL_InterruptsDisabled) {
|
|
LOCAL_InterruptsDisabled = 0;
|
|
LOCAL_UncaughtThrow = TRUE;
|
|
Yap_RestartYap(1);
|
|
}
|
|
#if DEBUG
|
|
// DumpActiveGoals( PASS_REGS1 );
|
|
#endif
|
|
/* wait if we we are in user code,
|
|
it's up to her to decide */
|
|
fun = FunctorError;
|
|
if (LOCAL_PrologMode & UserCCallMode) {
|
|
error_t = Yap_MkApplTerm(fun, 2, nt);
|
|
if (!(EX = Yap_StoreTermInDB(error_t, 2))) {
|
|
/* fat chance */
|
|
Yap_RestartYap(1);
|
|
}
|
|
} else {
|
|
if (type == ABORT_EVENT) {
|
|
error_t = MkAtomTerm(AtomDAbort);
|
|
} else {
|
|
error_t = Yap_MkApplTerm(fun, 2, nt);
|
|
}
|
|
Yap_JumpToEnv(error_t);
|
|
P = (yamop *)FAILCODE;
|
|
}
|
|
|
|
LOCAL_PrologMode &= ~InErrorMode;
|
|
return P;
|
|
}
|
|
|
|
static Int
|
|
is_boolean( USES_REGS1 )
|
|
{
|
|
Term t = Deref(ARG1);
|
|
//Term Context = Deref(ARG2)Yap_Error(INSTANTIATION_ERROR, t, NULL);;
|
|
if (IsVarTerm(t)) {
|
|
Yap_Error(INSTANTIATION_ERROR, t, NULL);
|
|
return false;
|
|
}
|
|
return t == TermTrue || t == TermFalse;
|
|
}
|
|
|
|
static Int
|
|
is_atom( USES_REGS1 )
|
|
{
|
|
Term t = Deref(ARG1);
|
|
//Term Context = Deref(ARG2)Yap_Error(INSTANTIATION_ERROR, t, NULL);;
|
|
if (IsVarTerm(t)) {
|
|
Yap_Error(INSTANTIATION_ERROR, t, NULL);
|
|
return false;
|
|
}
|
|
return IsAtomTerm( t );
|
|
}
|
|
|
|
|
|
|
|
static Int
|
|
is_callable( USES_REGS1 )
|
|
{
|
|
Term G = Deref(ARG1);
|
|
//Term Context = Deref(ARG2);
|
|
while (true) {
|
|
if (IsVarTerm(G)) {
|
|
Yap_Error(INSTANTIATION_ERROR, G, NULL);
|
|
return false;
|
|
}
|
|
if (IsApplTerm(G)) {
|
|
Functor f = FunctorOfTerm(G);
|
|
if (IsExtensionFunctor(f)) {
|
|
Yap_Error(TYPE_ERROR_CALLABLE, G, NULL);
|
|
}
|
|
if (f == FunctorModule) {
|
|
Term tm = ArgOfTerm( 1, G);
|
|
if (IsVarTerm(tm)) {
|
|
Yap_Error(INSTANTIATION_ERROR, G, NULL);
|
|
return false;
|
|
}
|
|
if (!IsAtomTerm(tm)) {
|
|
Yap_Error(TYPE_ERROR_CALLABLE, G, NULL);
|
|
return false;
|
|
}
|
|
G = ArgOfTerm( 2, G );
|
|
} else {
|
|
return true;
|
|
}
|
|
} else if (IsPairTerm(G) || IsAtomTerm(G)) {
|
|
return true;
|
|
} else {
|
|
Yap_Error(TYPE_ERROR_CALLABLE, G, NULL);
|
|
return false;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static Int
|
|
is_predicate_indicator( USES_REGS1 )
|
|
{
|
|
Term G = Deref(ARG1);
|
|
//Term Context = Deref(ARG2);
|
|
Term mod = CurrentModule;
|
|
|
|
G = Yap_YapStripModule(G, &mod);
|
|
if (IsVarTerm(G)) {
|
|
Yap_Error(INSTANTIATION_ERROR, G, NULL);
|
|
return false;
|
|
}
|
|
if (!IsVarTerm(mod) && !IsAtomTerm(mod)) {
|
|
Yap_Error(TYPE_ERROR_ATOM, G, NULL);
|
|
return false;
|
|
}
|
|
if (IsApplTerm(G)) {
|
|
Functor f = FunctorOfTerm(G);
|
|
if (IsExtensionFunctor(f)) {
|
|
Yap_Error(TYPE_ERROR_PREDICATE_INDICATOR, G, NULL);
|
|
}
|
|
if (f == FunctorSlash || f == FunctorDoubleSlash) {
|
|
return true;
|
|
}
|
|
}
|
|
Yap_Error(TYPE_ERROR_PREDICATE_INDICATOR, G, NULL);
|
|
return false;
|
|
}
|
|
|
|
|
|
void
|
|
Yap_InitErrorPreds( void )
|
|
{
|
|
CACHE_REGS
|
|
Term cm = CurrentModule;
|
|
CurrentModule = ERROR_MODULE;
|
|
Yap_InitCPred("is_boolean", 2, is_boolean, TestPredFlag);
|
|
Yap_InitCPred("is_callable", 2, is_callable, TestPredFlag);
|
|
Yap_InitCPred("is_atom", 2, is_atom, TestPredFlag);
|
|
Yap_InitCPred("is_predicate_indicator", 2, is_predicate_indicator, TestPredFlag);
|
|
CurrentModule = cm;
|
|
}
|