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address model generation bugs raised in #4518 and #4324

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-07-24 13:22:19 -07:00
parent e1d2b88a82
commit 780346c7ca
3 changed files with 22 additions and 8 deletions
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16
src/model/seq_factory.h
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@ -115,9 +115,23 @@ public:
}
if (u.is_seq(s, ch)) {
expr* v = m_model.get_fresh_value(ch);
if (!v) return nullptr;
if (v) {
return u.str.mk_unit(v);
}
else {
v = u.str.mk_unit(m_model.get_some_value(ch));
expr* uniq = nullptr;
if (m_unique_sequences.find(s, uniq)) {
uniq = u.str.mk_concat(v, uniq);
}
else {
uniq = v;
}
m_trail.push_back(uniq);
m_unique_sequences.insert(s, uniq);
return uniq;
}
}
UNREACHABLE();
return nullptr;
}

6
src/smt/seq_skolem.cpp
View file

@ -46,7 +46,9 @@ expr_ref seq_skolem::mk(symbol const& s, expr* e1, expr* e2, expr* e3, expr* e4,
if (!range) {
range = m.get_sort(e1);
}
return expr_ref(seq.mk_skolem(s, len, es, range), m);
expr_ref result(seq.mk_skolem(s, len, es, range), m);
m_rewrite(result);
return result;
}
expr_ref seq_skolem::mk_max_unfolding_depth(unsigned depth) {
@ -113,13 +115,11 @@ decompose_main:
head = seq.str.mk_unit(seq.str.mk_nth_i(s, idx));
tail = mk(m_tail, s, idx);
m_rewrite(head);
m_rewrite(tail);
}
else {
head = seq.str.mk_unit(seq.str.mk_nth_i(e, a.mk_int(0)));
tail = mk(m_tail, e, a.mk_int(0));
m_rewrite(head);
m_rewrite(tail);
}
}