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proof_utils: use expr_mark instead of hashtable

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This commit is contained in:
Arie Gurfinkel 2018-06-07 08:50:31 -07:00
parent 2a6b694373
commit a40e0dce0c
2 changed files with 18 additions and 14 deletions
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28
src/muz/spacer/spacer_proof_utils.cpp
View file

@ -202,6 +202,8 @@ void hypothesis_reducer::reset() {
m_pinned_active_hyps.reset();
m_pinned.reset();
m_hyp_mark.reset();
m_open_mark.reset();
m_visited.reset();
}
void hypothesis_reducer::compute_hypsets(proof *pr) {
@ -211,8 +213,7 @@ void hypothesis_reducer::compute_hypsets(proof *pr) {
while (!todo.empty()) {
proof* p = todo.back();
if (m_active_hyps.contains(p)) {
SASSERT(m_parent_hyps.contains(p));
if (m_visited.is_marked(p)) {
todo.pop_back();
continue;
}
@ -222,15 +223,15 @@ void hypothesis_reducer::compute_hypsets(proof *pr) {
SASSERT(m.is_proof(p->get_arg(i)));
proof *parent = to_app(p->get_arg(i));
if (!m_active_hyps.contains(parent)) {
SASSERT(!m_parent_hyps.contains(parent));
if (!m_visited.is_marked(parent))
todo.push_back(parent);
}
}
if (todo.size() > todo_sz) continue;
todo.pop_back();
m_visited.mark(p);
// create active_hyps-set and parent_hyps-set for step p
proof_set* active_hyps = alloc(proof_set);
m_pinned_active_hyps.insert(active_hyps);
@ -243,6 +244,8 @@ void hypothesis_reducer::compute_hypsets(proof *pr) {
// fill both sets
if (m.is_hypothesis(p)) {
active_hyps->insert(p);
m_open_mark.mark(p);
parent_hyps->insert(m.get_fact(p));
m_hyp_mark.mark(m.get_fact(p));
}
@ -251,9 +254,11 @@ void hypothesis_reducer::compute_hypsets(proof *pr) {
proof* parent = m.get_parent(p, i);
set_union(*parent_hyps, *m_parent_hyps.find(parent));
if (!m.is_lemma(p))
if (!m.is_lemma(p)) {
// lemmas clear all hypotheses
set_union(*active_hyps, *m_active_hyps.find(parent));
m_open_mark.mark(p, !active_hyps->empty());
}
}
}
}
@ -267,12 +272,9 @@ void hypothesis_reducer::collect_units(proof* pr) {
while (pit.hasNext()) {
proof* p = pit.next();
if (!m.is_hypothesis(p)) {
proof_set* active_hyps = m_active_hyps.find(p);
SASSERT(active_hyps);
// collect units that are hyp-free and are used as
// hypotheses in the proof pr
if (active_hyps->empty() && m.has_fact(p) &&
if (!m_open_mark.is_marked(p) && m.has_fact(p) &&
m_hyp_mark.is_marked(m.get_fact(p)))
m_units.insert(m.get_fact(p), p);
}
@ -383,9 +385,7 @@ proof* hypothesis_reducer::reduce_core(proof* pf) {
m_cache.insert(p, res);
// bail out as soon as found a sub-proof of false
SASSERT(m_active_hyps.contains(res));
proof_set* active_hyps = m_active_hyps.find(res);
if (active_hyps->empty() && m.has_fact(res) && m.is_false(m.get_fact(res)))
if (!m_open_mark.is_marked(res) && m.has_fact(res) && m.is_false(m.get_fact(res)))
return res;
}
UNREACHABLE();
@ -399,7 +399,7 @@ proof* hypothesis_reducer::mk_lemma_core(proof* premise, expr *fact) {
proof_set* active_hyps = m_active_hyps.find(premise);
// if there is no active hypothesis return the premise
if (active_hyps->empty()) {
if (!m_open_mark.is_marked(premise)) {
// XXX just in case premise might go away
m_pinned.push_back(premise);
return premise;

4
src/muz/spacer/spacer_proof_utils.h
View file

@ -84,7 +84,11 @@ private:
// during proof transformation
obj_map<proof, expr_set*> m_parent_hyps;
/// marks if an expression is ever used as a hypothesis in a proof
expr_mark m_hyp_mark;
/// marks a proof as open, i.e., has a non-discharged hypothesis as ancestor
expr_mark m_open_mark;
expr_mark m_visited;
void reset();