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track empty clause during pop

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If a theory solver creates the empty clause it gets dropped during pop.
By maintaining a variable m_empty_clause, the solver ensures that it retains the information that the search state is inconsistent.
This commit is contained in:
Nikolaj Bjorner 2019-12-09 11:10:37 +03:00
parent ebb7d60c75
commit 5cecd986e2
3 changed files with 8 additions and 2 deletions
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4
src/smt/smt_context.cpp
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@ -75,6 +75,7 @@ namespace smt {
m_phase_default(false),
m_conflict(null_b_justification),
m_not_l(null_literal),
m_empty_clause(false),
m_conflict_resolution(mk_conflict_resolution(m, *this, m_dyn_ack_manager, p, m_assigned_literals, m_watches)),
m_unsat_proof(m),
m_dyn_ack_manager(*this, p),
@ -2395,9 +2396,10 @@ namespace smt {
m_unsat_proof = nullptr;
}
m_base_scopes.shrink(new_lvl);
m_empty_clause = false;
}
else {
m_conflict = null_b_justification;
m_conflict = m_empty_clause ? b_justification::mk_axiom() : null_b_justification;
m_not_l = null_literal;
}
del_clauses(m_aux_clauses, s.m_aux_clauses_lim);