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z3str3: construct proper cex for str.at model construction

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This commit is contained in:
Murphy Berzish 2020-06-01 14:55:44 -04:00
parent e634f2987c
commit f395c8643c
1 changed files with 4 additions and 1 deletions
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5
src/smt/theory_str_mc.cpp
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@ -725,7 +725,10 @@ namespace smt {
v.init(&get_context());
rational pos_value;
bool pos_exists = v.get_value(pos, pos_value);
ENSURE(pos_exists);
if (!pos_exists) {
cex = m.mk_or(m_autil.mk_ge(pos, mk_int(0)), m_autil.mk_le(pos, mk_int(0)));
return false;
}
TRACE("str_fl", tout << "reduce str.at: base=" << mk_pp(base, m) << ", pos=" << pos_value.to_string() << std::endl;);
if (pos_value.is_neg() || pos_value >= rational(base_chars.size())) {
// return the empty string