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add unit extraction

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2018-03-06 01:08:17 -08:00
parent 75ba65a18a
commit 718e5a9b6c
27 changed files with 207 additions and 76 deletions
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47
src/tactic/generic_model_converter.cpp
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@ -181,6 +181,53 @@ void generic_model_converter::operator()(expr_ref& fml) {
fml = mk_and(fmls);
}
void generic_model_converter::get_units(obj_map<expr, bool>& units) {
th_rewriter rw(m);
expr_safe_replace rep(m);
expr_ref tmp(m);
bool val = false;
expr* f = nullptr;
for (auto const& kv : units) {
rep.insert(kv.m_key, kv.m_value ? m.mk_true() : m.mk_false());
}
for (unsigned i = m_entries.size(); i-- > 0;) {
entry const& e = m_entries[i];
switch (e.m_instruction) {
case HIDE:
tmp = m.mk_const(e.m_f);
if (units.contains(tmp)) {
m.dec_ref(tmp);
units.remove(tmp);
}
break;
case ADD:
if (e.m_f->get_arity() == 0 && m.is_bool(e.m_f->get_range())) {
tmp = m.mk_const(e.m_f);
if (units.contains(tmp)) {
break;
}
tmp = e.m_def;
rep(tmp);
rw(tmp);
if (m.is_true(tmp)) {
tmp = m.mk_const(e.m_f);
m.inc_ref(tmp);
units.insert(tmp, true);
rep.insert(tmp, m.mk_true());
}
else if (m.is_false(tmp)) {
tmp = m.mk_const(e.m_f);
m.inc_ref(tmp);
units.insert(tmp, false);
rep.insert(tmp, m.mk_false());
}
}
break;
}
}
}
/*
\brief simplify definition expansion from model converter in the case they come from blocked clauses.
In this case the definitions are of the form: