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z3str3: fix up regex heuristics (#4342)

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fixes #4308, partially fixes #4309
This commit is contained in:
Murphy Berzish 2020-05-16 19:17:32 -05:00 • committed by GitHub
parent bfb38451d1
commit 3147be66fe
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1 changed files with 4 additions and 3 deletions
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7
src/smt/theory_str_regex.cpp
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@ -910,7 +910,7 @@ namespace smt {
return check_regex_length_linearity_helper(sub1, already_star);
} else {
TRACE("str", tout << "WARNING: unknown regex term " << mk_pp(re, get_manager()) << std::endl;);
UNREACHABLE(); return false;
return false;
}
}
@ -1144,8 +1144,9 @@ namespace smt {
expr_ref rhs2(m_autil.mk_ge(strlen, m_autil.mk_numeral(nonzero_lower_bound, true)), m);
rhs.push_back(m.mk_or(rhs1, rhs2));
} else {
// shouldn't happen
UNREACHABLE();
// length of solution can ONLY be 0
expr_ref rhs1(ctx.mk_eq_atom(strlen, m_autil.mk_numeral(rational::zero(), true)), m);
rhs.push_back(rhs1);
}
} else {
// no solution at 0