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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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6
src/ast/rewriter/seq_rewriter.cpp
View file

@ -1206,8 +1206,7 @@ bool seq_rewriter::is_sequence(expr* e, expr_ref_vector& seq) {
e = todo.back();
todo.pop_back();
if (m_util.str.is_string(e, s)) {
for (unsigned i = s.length(); i > 0; ) {
--i;
for (unsigned i = 0; i < s.length(); ++i) {
seq.push_back(m_util.str.mk_char(s, i));
}
}
@ -1218,14 +1217,13 @@ bool seq_rewriter::is_sequence(expr* e, expr_ref_vector& seq) {
seq.push_back(e1);
}
else if (m_util.str.is_concat(e, e1, e2)) {
todo.push_back(e1);
todo.push_back(e2);
todo.push_back(e1);
}
else {
return false;
}
}
seq.reverse();
return true;
}

9
src/smt/theory_seq.cpp
View file

@ -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));

7
src/smt/theory_str.cpp
View file

@ -8388,13 +8388,12 @@ namespace smt {
lbool theory_str::validate_unsat_core(expr_ref_vector & unsat_core) {
app * target_term = to_app(get_manager().mk_not(m_theoryStrOverlapAssumption_term));
get_context().internalize(target_term, false);
enode* e1 = get_context().get_enode(target_term);
for (unsigned i = 0; i < unsat_core.size(); ++i) {
app * core_term = to_app(unsat_core.get(i));
// not sure if this is the correct way to compare terms in this context
enode * e1;
enode * e2;
e1 = get_context().get_enode(target_term);
e2 = get_context().get_enode(core_term);
if (!get_context().e_internalized(core_term)) continue;
enode *e2 = get_context().get_enode(core_term);
if (e1 == e2) {
TRACE("str", tout << "overlap detected in unsat core, changing UNSAT to UNKNOWN" << std::endl;);
return l_undef;