void check_predicate(ast_mark& mark, expr* a) {
ptr_vector<expr> todo;
todo.push_back(a);
while (!todo.empty()) {
a = todo.back();
todo.pop_back();
if (mark.is_marked(a)) {
continue;
}
mark.mark(a, true);
if (is_quantifier(a)) {
a = to_quantifier(a)->get_expr();
todo.push_back(a);
}
else if (m.is_not(a) || m.is_and(a) || m.is_or(a) || m.is_implies(a)) {
todo.append(to_app(a)->get_num_args(), to_app(a)->get_args());
}
else if (m.is_ite(a)) {
todo.push_back(to_app(a)->get_arg(1));
todo.push_back(to_app(a)->get_arg(2));
}
else if (is_predicate(a)) {
register_predicate(a);
}
}
}
bool compute_mark1(proof *pr)
{
bool hyp_mark = false;
// lemmas clear all hypotheses
if (!m.is_lemma(pr)) {
for (unsigned i = 0, sz = m.get_num_parents(pr); i < sz; ++i) {
if (m_hypmark.is_marked(m.get_parent(pr, i))) {
hyp_mark = true;
break;
}
}
}
m_hypmark.mark(pr, hyp_mark);
return hyp_mark;
}
void reset()
{
m_cache.reset();
m_units.reset();
m_hyps.reset();
m_hypmark.reset();
m_pinned.reset();
}
bool for_each_parameter(ptr_vector<ast> & stack, ast_mark & visited, unsigned num_args, parameter const * params) {
bool result = true;
for (unsigned i = 0; i < num_args; i++) {
parameter const& p = params[i];
if (p.is_ast() && !visited.is_marked(p.get_ast())) {
stack.push_back(p.get_ast());
result = false;
}
}
return result;
}
void compute_marks(proof* pr) {
proof *p;
proof_post_order pit(pr, m);
while (pit.hasNext()) {
p = pit.next();
if (m.is_hypothesis(p)) {
m_hypmark.mark(p, true);
m_hyps.insert(m.get_fact(p));
}
else {
bool hyp_mark = compute_mark1(p);
// collect units that are hyp-free and are used as hypotheses somewhere
if (!hyp_mark && m.has_fact(p) && m_hyps.contains(m.get_fact(p))) {
m_units.insert(m.get_fact(p), p);
}
}
}
}
