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fixes to clause proof tracking

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2018-05-29 15:40:39 -07:00 • committed by Arie Gurfinkel
parent f7d015de8d
commit 0c2e3c0894
5 changed files with 19 additions and 37 deletions
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46
src/smt/smt_context.cpp
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@ -3144,8 +3144,14 @@ namespace smt {
mark_as_relevant(lit);
m_clause_lits.push_back(get_literal(lit));
}
if (m_clause_lits.size() > 2)
m_clause = clause::mk(m_manager, m_clause_lits.size(), m_clause_lits.c_ptr(), CLS_AUX);
if (m_clause_lits.size() >= 2) {
justification* js = nullptr;
if (m_manager.proofs_enabled()) {
proof * pr = mk_clause_def_axiom(m_clause_lits.size(), m_clause_lits.c_ptr(), nullptr);
js = mk_justification(justification_proof_wrapper(*this, pr));
}
m_clause = clause::mk(m_manager, m_clause_lits.size(), m_clause_lits.c_ptr(), CLS_AUX, js);
}
}
lbool context::decide_clause() {
@ -3163,38 +3169,12 @@ namespace smt {
return l_undef;
}
}
for (unsigned i = m_assigned_literals.size(); i-- > 0; ) {
literal nlit = ~m_assigned_literals[i];
if (m_clause_lits.contains(nlit)) {
switch (m_clause_lits.size()) {
case 1: {
b_justification js;
set_conflict(js, ~nlit);
break;
}
case 2: {
if (nlit == m_clause_lits[1]) {
std::swap(m_clause_lits[0], m_clause_lits[1]);
}
b_justification js(~m_clause_lits[1]);
set_conflict(js, ~nlit);
break;
}
default: {
for (unsigned j = 0, sz = m_clause->get_num_literals(); j < sz; ++j) {
if (m_clause->get_literal(j) == nlit) {
if (j > 0) m_clause->swap_lits(j, 0);
break;
}
}
b_justification js(m_clause);
set_conflict(js, ~nlit);
break;
}
}
break;
}
if (m_clause_lits.size() == 1) {
set_conflict(b_justification(), ~m_clause_lits[0]);
}
else {
set_conflict(b_justification(m_clause), null_literal);
}
VERIFY(!resolve_conflict());
return l_false;
}