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Improve clause management and instantiation logic

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Refactor clause handling and instantiate logic in finite set theory.
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Nikolaj Bjorner 2025-10-15 14:51:39 +02:00 • committed by GitHub
parent 8ec04d2b81
commit e66d704967
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1 changed files with 14 additions and 7 deletions
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19
src/smt/theory_finite_set.cpp
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@ -33,7 +33,7 @@ namespace smt {
// Setup the add_clause callback for axioms
std::function<void(expr_ref_vector const &)> add_clause_fn =
[this](expr_ref_vector const& clause) {
this->add_clause(clause);
this->m_lemmas.push_back(clause);
};
m_axioms.set_add_clause(add_clause_fn);
}
@ -100,21 +100,28 @@ namespace smt {
// walk all parents of elem in congruence table.
// if a parent is of the form elem' in S u T, or similar.
// create clauses for elem = elem' => clause.
// if a new clause was added, return FC_CONTINUE
bool new_clause = false;
// create clauses for elem in S u T.
expr* elem1 = nullptr, *set1 = nullptr;
m_lemmas.reset();
for (auto elem : m_elements) {
for (auto p : enode::parents(elem)) {
if (!u.is_in(p->get_expr(), elem1, set1))
continue;
if (elem->get_root() != p->get_arg(0)->get_root())
continue; // elem is then equal to set1 but not elem1. This is a different case.
instantiate_axioms(elem->get_expr(), set1->get_expr());
for (auto sib : *p->get_arg(1))
instantiate_axioms(elem->get_expr(), sib->get_expr());
}
}
if (instantiate_false_lemma())
return FC_CONTINUE;
if (instantiate_unit_propagation())
return FC_CONTINUE;
if (instantiate_free_lemma())
return FC_CONTINUE;
return new_clause ? FC_CONTINUE : FC_DONE;
return FC_DONE;
}
void theory_finite_set::instantiate_axioms(expr* elem, expr* set) {