bool is_well_formed_vars(ptr_vector<sort>& bound, expr* e) {
ptr_vector<expr> todo;
ast_mark mark;
todo.push_back(e);
while (!todo.empty()) {
expr* e = todo.back();
todo.pop_back();
if (mark.is_marked(e)) {
continue;
}
mark.mark(e, true);
if (is_quantifier(e)) {
quantifier* q = to_quantifier(e);
unsigned depth = q->get_num_decls();
bound.append(depth, q->get_decl_sorts());
if (!is_well_formed_vars(bound, q->get_expr())) {
return false;
}
bound.resize(bound.size()-depth);
}
else if (is_app(e)) {
app* a = to_app(e);
for (unsigned i = 0; i < a->get_num_args(); ++i) {
todo.push_back(a->get_arg(i));
}
}
else if (is_var(e)) {
var* v = to_var(e);
unsigned index = v->get_idx();
sort* s = v->get_sort();
SASSERT(index < bound.size());
index = bound.size()-1-index;
if (!bound[index]) {
bound[index] = s;
}
if (bound[index] != s) {
return false;
}
}
else {
UNREACHABLE();
}
}
return true;
}
void simple_check_sat_result::get_unsat_core(ptr_vector<expr> & r) {
if (m_status == l_false)
r.append(m_core.size(), m_core.c_ptr());
}
