//
// Hoist quantifier from rule (universal) or query (existential)
//
unsigned rule_manager::hoist_quantifier(bool is_forall, expr_ref& fml, svector<symbol>* names) {
unsigned index = var_counter().get_next_var(fml);
while (is_quantifier(fml) && (is_forall == to_quantifier(fml)->is_forall())) {
quantifier* q = to_quantifier(fml);
index += q->get_num_decls();
if (names) {
names->append(q->get_num_decls(), q->get_decl_names());
}
fml = q->get_expr();
}
if (!has_quantifiers(fml)) {
return index;
}
app_ref_vector vars(m);
quantifier_hoister qh(m);
qh.pull_quantifier(is_forall, fml, vars);
if (vars.empty()) {
return index;
}
// replace vars by de-bruijn indices
expr_substitution sub(m);
for (unsigned i = 0; i < vars.size(); ++i) {
app* v = vars[i].get();
if (names) {
names->push_back(v->get_decl()->get_name());
}
sub.insert(v, m.mk_var(index++,m.get_sort(v)));
}
scoped_ptr<expr_replacer> rep = mk_default_expr_replacer(m);
rep->set_substitution(&sub);
(*rep)(fml);
return index;
}
imp(ast_manager& m) : m_manager(m), m_rewriter(m) {
m_replace = mk_default_expr_replacer(m);
}
bv_plugin(i_solver_context& ctx, ast_manager& m):
qe_solver_plugin(m, m.get_family_id("bv"), ctx),
m_replace(mk_default_expr_replacer(m)),
m_bv(m)
{}
