mirrors/z3
3
0
Fork 0
mirror of https://github.com/Z3Prover/z3 synced 2025-08-22 11:07:51 +00:00
Code Activity

fix cnf check

Browse source 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2019-01-11 21:17:39 -08:00
parent b8d18c6c6d
commit 63d480fd92
4 changed files with 96 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

85
src/sat/sat_drat.cpp
View file

@ -143,7 +143,7 @@ namespace sat {
IF_VERBOSE(20, trace(verbose_stream(), n, c.begin(), st););
if (st == status::learned) {
verify(n, c.begin());
verify(c);
}
m_status.push_back(st);
@ -225,6 +225,55 @@ namespace sat {
m_units.resize(num_units);
bool ok = m_inconsistent;
m_inconsistent = false;
if (!ok) {
literal_vector lits(n, c);
IF_VERBOSE(0, verbose_stream() << "not drup " << lits << "\n");
for (unsigned v = 0; v < m_assignment.size(); ++v) {
lbool val = m_assignment[v];
if (val != l_undef) {
IF_VERBOSE(0, verbose_stream() << literal(v, false) << " |-> " << val << "\n");
}
}
for (clause* cp : s.m_clauses) {
clause& cl = *cp;
bool found = false;
for (literal l : cl) {
if (m_assignment[l.var()] != (l.sign() ? l_true : l_false)) {
found = true;
break;
}
}
if (!found) {
IF_VERBOSE(0, verbose_stream() << "Clause is false under assignment: " << cl << "\n");
}
}
for (clause* cp : s.m_learned) {
clause& cl = *cp;
bool found = false;
for (literal l : cl) {
if (m_assignment[l.var()] != (l.sign() ? l_true : l_false)) {
found = true;
break;
}
}
if (!found) {
IF_VERBOSE(0, verbose_stream() << "Clause is false under assignment: " << cl << "\n");
}
}
svector<sat::solver::bin_clause> bin;
s.collect_bin_clauses(bin, true);
for (auto & b : bin) {
bool found = false;
if (m_assignment[b.first.var()] != (b.first.sign() ? l_true : l_false)) found = true;
if (m_assignment[b.second.var()] != (b.second.sign() ? l_true : l_false)) found = true;
if (!found) {
IF_VERBOSE(0, verbose_stream() << "Bin clause is false under assignment: " << b.first << " " << b.second << "\n");
}
}
IF_VERBOSE(0, s.display(verbose_stream()));
exit(0);
}
return ok;
}
@ -280,7 +329,10 @@ namespace sat {
void drat::verify(unsigned n, literal const* c) {
if (m_check_unsat && !is_drup(n, c) && !is_drat(n, c)) {
std::cout << "Verification failed\n";
literal_vector lits(n, c);
std::cout << "Verification of " << lits << " failed\n";
s.display(std::cout);
exit(0);
UNREACHABLE();
//display(std::cout);
TRACE("sat",
@ -291,6 +343,35 @@ namespace sat {
}
}
bool drat::contains(unsigned n, literal const* lits) {
for (unsigned i = m_proof.size(); i-- > 0; ) {
clause& c = *m_proof[i];
status st = m_status[i];
if (match(n, lits, c)) {
return st != status::deleted;
}
}
return false;
}
bool drat::match(unsigned n, literal const* lits, clause const& c) const {
if (n == c.size()) {
for (unsigned i = 0; i < n; ++i) {
literal lit1 = lits[i];
bool found = false;
for (literal lit2 : c) {
if (lit1 == lit2) {
found = true;
break;
}
}
if (!found) return false;
}
return true;
}
return false;
}
void drat::display(std::ostream& out) const {
out << "units: " << m_units << "\n";
for (unsigned i = 0; i < m_assignment.size(); ++i) {