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fix syntax error: tokens might be overwritten by Yap_unify(

This commit is contained in:
Vitor Santos Costa 2012-10-16 17:24:39 +01:00
parent 4b35fd8271
commit f753bce4fe
1 changed files with 2 additions and 2 deletions
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4
C/iopreds.c
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@ -271,13 +271,11 @@ syntax_error (TokEntry * tokptr, IOSTREAM *st, Term *outp)
CELL *Hi = H;
/* make sure to globalise variable */
Yap_unify(*outp, MkVarTerm());
start = tokptr->TokPos;
clean_vars(LOCAL_VarTable);
clean_vars(LOCAL_AnonVarTable);
while (1) {
Term ts[2];
if (H > ASP-1024) {
tf[3] = TermNil;
err = 0;
@ -357,6 +355,8 @@ syntax_error (TokEntry * tokptr, IOSTREAM *st, Term *outp)
}
tokptr = tokptr->TokNext;
}
/* now we can throw away tokens, so we can unify and possibly overwrite TR */
Yap_unify(*outp, MkVarTerm());
if (IsVarTerm(*outp) && (VarOfTerm(*outp) > H || VarOfTerm(*outp) < H0)) {
tf[0] = Yap_MkNewApplTerm(Yap_MkFunctor(AtomRead,1),1);
} else {