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introduce fresh term when none is available in context or model to fix #2456

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2019-08-04 11:56:03 -07:00
parent c7dc420b3b
commit 59f69bbe0d
3 changed files with 19 additions and 8 deletions
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16
src/smt/smt_model_checker.cpp
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@ -78,6 +78,19 @@ namespace smt {
return t;
}
expr * model_checker::get_type_compatible_term(expr * val) {
for (auto const& kv : m_value2expr) {
if (m.get_sort(kv.m_key) == m.get_sort(val) &&
!contains_model_value(kv.m_key)) {
return kv.m_key;
}
}
app* fresh_term = m.mk_fresh_const("sk", m.get_sort(val));
m_context->ensure_internalized(fresh_term);
m_value2expr.insert(val, fresh_term);
return fresh_term;
}
void model_checker::init_value2expr() {
if (m_value2expr.empty()) {
// populate m_value2expr
@ -207,8 +220,7 @@ namespace smt {
}
}
if (contains_model_value(sk_value)) {
TRACE("model_checker", tout << "value is private to model: " << sk_value << "\n";);
return false;
sk_value = get_type_compatible_term(sk_value);
}
func_decl * f = nullptr;
if (autil.is_as_array(sk_value, f) && cex->get_func_interp(f)) {