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Add monadic regex statistics
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 2bcccba7-ac7d-476e-8dfe-718a21d37554
This commit is contained in:
Nikolaj Bjorner
parent
079eb4b534
commit
3e1fd56ca2
4 changed files with 82 additions and 9 deletions
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@ -92,9 +92,11 @@ lbool seq_monadic::nullable(expr* r) {
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}
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expr_ref_pair_vector const& seq_monadic::derivative_cofactors(expr* r) {
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++m_stats.m_cofactor_calls;
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expr_ref_pair_vector* v = nullptr;
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if (m_cofactors.find(r, v))
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return *v;
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++m_stats.m_states;
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v = alloc(expr_ref_pair_vector, m);
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if (m_config.m_mode == transition_mode::light_antimirov)
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m_rw.light_ant_derivative_cofactors(r, *v);
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@ -122,7 +124,14 @@ bool seq_monadic::live_states(expr* R, expr_ref_vector& out) {
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intern(R);
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const unsigned STATE_CAP = 1u << 12;
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for (unsigned i = 0; i < states.size(); ++i) {
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if (states.size() > STATE_CAP || !m.inc()) return false;
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if (states.size() > STATE_CAP) {
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m_stats.inc_bail(bail_reason::state_cap);
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return false;
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}
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if (!m.inc()) {
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m_stats.inc_bail(bail_reason::resource);
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return false;
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}
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expr_ref_pair_vector const& cof = derivative_cofactors(states.get(i));
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for (auto const& [g, t] : cof) {
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if (re().is_empty(t)) continue;
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@ -280,7 +289,11 @@ lbool seq_monadic::product_nonempty(svector<component> const& comps, expr_ref* w
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guard_set nacc = acc;
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nacc.conjoin(g);
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lbool ne = nacc.eval(nullptr);
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if (ne == l_undef) { bail = true; return; } // non-range / unknown guard
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if (ne == l_undef) {
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m_stats.inc_bail(bail_reason::guard);
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bail = true;
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return;
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}
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if (ne == l_false) continue; // empty joint guard: prune
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cur[i] = t;
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rec(i + 1, nacc);
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@ -289,7 +302,16 @@ lbool seq_monadic::product_nonempty(svector<component> const& comps, expr_ref* w
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};
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while (!work.empty()) {
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if (m_budget == 0 || !m.inc()) { m_giveup = true; return l_undef; }
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if (m_budget == 0) {
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m_stats.inc_bail(bail_reason::budget);
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m_giveup = true;
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return l_undef;
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}
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if (!m.inc()) {
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m_stats.inc_bail(bail_reason::resource);
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m_giveup = true;
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return l_undef;
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}
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--m_budget;
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for (unsigned i = n; i-- > 0; ) {
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st[i] = work.back();
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@ -300,8 +322,10 @@ lbool seq_monadic::product_nonempty(svector<component> const& comps, expr_ref* w
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*witness_word = reconstruct(fill_key(st));
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return l_true;
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}
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if (undecided)
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if (undecided) {
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m_stats.inc_bail(bail_reason::nullability);
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return l_undef;
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}
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for (unsigned i = 0; i < n; ++i)
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branches[i] = &derivative_cofactors(st[i]);
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@ -373,16 +397,24 @@ void seq_monadic::reset_search() {
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bool seq_monadic::prepare(membership_vec const& memberships) {
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reset_search();
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for (auto const& [term, regex, d] : memberships) {
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if (!u().is_re(regex, m_seq_sort))
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if (!u().is_re(regex, m_seq_sort)) {
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m_stats.inc_bail(bail_reason::unsupported);
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return false;
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if (!u().is_seq(m_seq_sort, m_elem_sort))
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}
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if (!u().is_seq(m_seq_sort, m_elem_sort)) {
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m_stats.inc_bail(bail_reason::unsupported);
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return false;
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}
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vector<atom> atoms;
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expr* the_var = nullptr;
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if (!parse_term(term, atoms, the_var))
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if (!parse_term(term, atoms, the_var)) {
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m_stats.inc_bail(bail_reason::unsupported);
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return false;
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if (!the_var)
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}
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if (!the_var) {
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m_stats.inc_bail(bail_reason::unsupported);
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return false; // no variable: ground membership, not our case
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}
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m_regexes.push_back(regex);
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m_atoms.push_back(atoms);
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m_pin.push_back(regex);
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@ -460,7 +492,13 @@ lbool seq_monadic::dfs_membership(unsigned mi) {
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lbool seq_monadic::dfs_atoms(unsigned mi, unsigned i, expr* R) {
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if (m_giveup)
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return l_undef; // unwind the whole search, don't keep branching
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if (m_budget == 0 || !m.inc()) {
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if (m_budget == 0) {
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m_stats.inc_bail(bail_reason::budget);
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m_giveup = true;
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return l_undef;
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}
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if (!m.inc()) {
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m_stats.inc_bail(bail_reason::resource);
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m_giveup = true;
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return l_undef;
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}
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@ -472,6 +510,7 @@ lbool seq_monadic::dfs_atoms(unsigned mi, unsigned i, expr* R) {
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return dfs_membership(mi + 1);
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if (nb == l_false)
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return l_false;
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m_stats.inc_bail(bail_reason::nullability);
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return l_undef; // undecidable nullability
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}
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atom const& a = atoms[i];
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@ -622,3 +661,19 @@ lbool seq_monadic::check() {
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minimize_core(m_memberships);
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return r;
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}
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void seq_monadic::collect_statistics(::statistics& st) const {
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static char const* const bail_names[] = {
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"seq monadic bail unsupported",
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"seq monadic bail state cap",
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"seq monadic bail dnf cap",
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"seq monadic bail budget",
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"seq monadic bail resource",
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"seq monadic bail nullability",
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"seq monadic bail guard"
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};
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st.update("seq monadic cofactor calls", m_stats.m_cofactor_calls);
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st.update("seq monadic states", m_stats.m_states);
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for (unsigned i = 0; i < static_cast<unsigned>(bail_reason::num_reasons); ++i)
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st.update(bail_names[i], m_stats.m_bails[i]);
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}
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