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fix #1677

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2018-06-18 11:22:01 -07:00
parent 55ebf69648
commit c3b27903f8
3 changed files with 11 additions and 11 deletions
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9
src/smt/theory_seq.cpp
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@ -2251,7 +2251,9 @@ bool theory_seq::internalize_term(app* term) {
e = ctx.mk_enode(term, false, m.is_bool(term), true);
}
mk_var(e);
if (m_util.str.is_string(term)) {
add_elim_string_axiom(term);
}
return true;
}
@ -3086,6 +3088,7 @@ void theory_seq::propagate() {
void theory_seq::enque_axiom(expr* e) {
if (!m_axiom_set.contains(e)) {
TRACE("seq", tout << "add axiom " << mk_pp(e, m) << "\n";);
m_axioms.push_back(e);
m_axiom_set.insert(e);
m_trail_stack.push(push_back_vector<theory_seq, expr_ref_vector>(m_axioms));
@ -3285,13 +3288,13 @@ void theory_seq::add_replace_axiom(expr* r) {
void theory_seq::add_elim_string_axiom(expr* n) {
zstring s;
TRACE("seq", tout << mk_pp(n, m) << "\n";);
VERIFY(m_util.str.is_string(n, s));
if (s.length() == 0) {
return;
}
expr_ref result(m_util.str.mk_unit(m_util.str.mk_char(s, s.length()-1)), m);
for (unsigned i = s.length()-1; i > 0; ) {
--i;
for (unsigned i = s.length()-1; i-- > 0; ) {
result = mk_concat(m_util.str.mk_unit(m_util.str.mk_char(s, i)), result);
}
add_axiom(mk_eq(n, result, false));