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qe_lite> fix crash in is_var_eq()

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(by me & Nikolaj)

Signed-off-by: Nuno Lopes <t-nclaud@microsoft.com>
This commit is contained in:
Nuno Lopes 2013-03-25 09:53:11 -07:00
parent b1fc6a5cac
commit b427958b9e
1 changed files with 14 additions and 7 deletions
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21
src/muz_qe/qe_lite.cpp
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@ -201,9 +201,15 @@ namespace eq {
return (*m_is_variable)(e);
}
bool is_neg_var(ast_manager & m, expr * e) {
bool is_neg_var(ast_manager & m, expr * e, var*& v) {
expr* e1;
return m.is_not(e, e1) && is_variable(e1);
if (m.is_not(e, e1) && is_variable(e1)) {
v = to_var(e1);
return true;
}
else {
return false;
}
}
@ -328,18 +334,19 @@ namespace eq {
bool is_var_eq(expr * e, ptr_vector<var>& vs, expr_ref_vector & ts) {
expr* lhs, *rhs;
var* v;
// (= VAR t), (iff VAR t), (iff (not VAR) t), (iff t (not VAR)) cases
if (m.is_eq(e, lhs, rhs) || m.is_iff(e, lhs, rhs)) {
// (iff (not VAR) t) (iff t (not VAR)) cases
if (!is_variable(lhs) && !is_variable(rhs) && m.is_bool(lhs)) {
if (!is_neg_var(m, lhs)) {
if (!is_neg_var(m, lhs, v)) {
std::swap(lhs, rhs);
}
if (!is_neg_var(m, lhs)) {
if (!is_neg_var(m, lhs, v)) {
return false;
}
vs.push_back(to_var(lhs));
vs.push_back(v);
ts.push_back(m.mk_not(rhs));
TRACE("qe_lite", tout << mk_pp(e, m) << "\n";);
return true;
@ -378,9 +385,9 @@ namespace eq {
}
// VAR = false case
if (is_neg_var(m, e)) {
if (is_neg_var(m, e, v)) {
ts.push_back(m.mk_false());
vs.push_back(to_var(to_app(e)->get_arg(0)));
vs.push_back(v);
TRACE("qe_lite", tout << mk_pp(e, m) << "\n";);
return true;
}