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subsumes should check for loops (Ulrich's #146).

This commit is contained in:
Vitor Santos Costa 2009-11-17 02:08:01 +00:00
parent b7646836b6
commit 7b85efff0c
1 changed files with 6 additions and 1 deletions
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7
C/utilpreds.c
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@ -2542,6 +2542,7 @@ p_variant(void) /* variant terms t1 and t2 */
return FALSE;
}
static int subsumes_complex(register CELL *pt0, register CELL *pt0_end, register
CELL *pt1)
{
@ -2601,6 +2602,8 @@ static int subsumes_complex(register CELL *pt0, register CELL *pt0_end, register
Bind_Global(pt0, new);
if (d0 != d1) { /* avoid loops */
Bind_Global(VarOfTerm(new), d1);
if (Yap_rational_tree_loop(VarOfTerm(new)-1,VarOfTerm(new),(CELL **)AuxSp,(CELL **)AuxBase))
goto fail;
}
} else {
if (d0 == d1) continue;
@ -2759,7 +2762,9 @@ p_subsumes(void) /* subsumes terms t1 and t2 */
return (TRUE);
if (IsVarTerm(t1)) {
Bind(VarOfTerm(t1), t2);
return(TRUE);
if (Yap_rational_tree_loop(VarOfTerm(t1)-1,VarOfTerm(t1),(CELL **)AuxSp,(CELL **)AuxBase))
return FALSE;
return TRUE;
} else if (IsVarTerm(t2))
return(FALSE);
if (IsAtomOrIntTerm(t1)) {