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Check invariant on pvars

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This commit is contained in:
Jakob Rath 2022-12-19 13:55:50 +01:00
parent 208f166934
commit 69b41a7e70
4 changed files with 30 additions and 3 deletions
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22
src/math/polysat/solver.cpp
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@ -74,6 +74,7 @@ namespace polysat {
LOG("Assignment: " << assignments_pp(*this));
if (is_conflict()) LOG("Conflict: " << m_conflict);
IF_LOGGING(m_viable.log());
SASSERT(var_queue_invariant());
if (is_conflict() && at_base_level()) { LOG_H2("UNSAT"); return l_false; }
else if (is_conflict()) resolve_conflict();
else if (should_add_pwatch()) add_pwatch();
@ -1445,7 +1446,7 @@ namespace polysat {
}
/** Check that boolean assignment and constraint evaluation are consistent */
bool solver::assignment_invariant() {
bool solver::assignment_invariant() const {
if (is_conflict())
return true;
bool ok = true;
@ -1464,6 +1465,25 @@ namespace polysat {
return ok;
}
/** Check that each variable is either assigned or queued for decisions */
bool solver::var_queue_invariant() const {
if (is_conflict())
return true;
uint_set active;
for (pvar v : m_free_pvars)
active.insert(v);
for (auto const& [v, val] : assignment())
active.insert(v);
bool ok = true;
for (pvar v = 0; v < num_vars(); ++v) {
if (!active.contains(v)) {
ok = false;
LOG("Lost variable v" << v << " (it is neither assigned nor free)");
}
}
return ok;
}
/// Check that all constraints on the stack are satisfied by the current model.
bool solver::verify_sat() {
LOG_H1("Checking current model...");