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https://github.com/Z3Prover/z3
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#5417 - revise q_eval based on bug based on non-chronological dependencies with post-hoc explain function
This commit is contained in:
Nikolaj Bjorner
parent
e8bc9f3469
commit
7d915eb295
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@ -156,26 +156,26 @@ namespace euf {
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svector<update_record> m_updates;
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unsigned_vector m_scopes;
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enode_vector m_expr2enode;
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enode* m_tmp_eq { nullptr };
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enode* m_tmp_node { nullptr };
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unsigned m_tmp_node_capacity { 0 };
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enode* m_tmp_eq = nullptr;
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enode* m_tmp_node = nullptr;
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unsigned m_tmp_node_capacity = 0;
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enode_vector m_nodes;
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expr_ref_vector m_exprs;
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vector<enode_vector> m_decl2enodes;
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enode_vector m_empty_enodes;
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unsigned m_num_scopes { 0 };
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bool m_inconsistent { false };
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enode *m_n1 { nullptr };
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enode *m_n2 { nullptr };
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unsigned m_num_scopes = 0;
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bool m_inconsistent = false;
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enode *m_n1 = nullptr;
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enode *m_n2 = nullptr;
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justification m_justification;
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unsigned m_new_lits_qhead { 0 };
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unsigned m_new_th_eqs_qhead { 0 };
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unsigned m_new_lits_qhead = 0;
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unsigned m_new_th_eqs_qhead = 0;
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svector<enode_bool_pair> m_new_lits;
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svector<th_eq> m_new_th_eqs;
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bool_vector m_th_propagates_diseqs;
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enode_vector m_todo;
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stats m_stats;
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bool m_uses_congruence { false };
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bool m_uses_congruence = false;
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std::function<void(enode*,enode*)> m_on_merge;
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std::function<void(enode*)> m_on_make;
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std::function<void(expr*,expr*,expr*)> m_used_eq;
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@ -125,7 +125,7 @@ namespace euf {
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ast_manager & m_manager;
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bool m_commutativity{ false }; //!< true if the last found congruence used commutativity
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bool m_commutativity = false; //!< true if the last found congruence used commutativity
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ptr_vector<void> m_tables;
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map<decl_info, unsigned, decl_hash, decl_eq> m_func_decl2id;
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@ -57,7 +57,7 @@ namespace q {
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unsigned m_index;
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vector<lit> m_lits;
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quantifier_ref m_q;
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sat::literal m_literal;
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sat::literal m_literal = sat::null_literal;
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q::quantifier_stat* m_stat = nullptr;
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binding* m_bindings = nullptr;
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@ -75,10 +75,12 @@ namespace q {
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struct justification {
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expr* m_lhs, *m_rhs;
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bool m_sign;
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unsigned m_num_ev;
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euf::enode_pair* m_evidence;
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clause& m_clause;
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euf::enode* const* m_binding;
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justification(lit const& l, clause& c, euf::enode* const* b):
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m_lhs(l.lhs), m_rhs(l.rhs), m_sign(l.sign), m_clause(c), m_binding(b) {}
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justification(lit const& l, clause& c, euf::enode* const* b, unsigned n, euf::enode_pair* ev):
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m_lhs(l.lhs), m_rhs(l.rhs), m_sign(l.sign), m_clause(c), m_binding(b), m_num_ev(n), m_evidence(ev) {}
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sat::ext_constraint_idx to_index() const {
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return sat::constraint_base::mem2base(this);
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}
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@ -94,7 +94,10 @@ namespace q {
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lit lit(expr_ref(l, m), expr_ref(r, m), sign);
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if (idx != UINT_MAX)
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lit = c[idx];
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auto* constraint = new (sat::constraint_base::ptr2mem(mem)) justification(lit, c, b);
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auto* ev = static_cast<euf::enode_pair*>(ctx.get_region().allocate(sizeof(euf::enode_pair) * m_evidence.size()));
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for (unsigned i = m_evidence.size(); i-- > 0; )
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ev[i] = m_evidence[i];
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auto* constraint = new (sat::constraint_base::ptr2mem(mem)) justification(lit, c, b, m_evidence.size(), ev);
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return constraint->to_index();
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}
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@ -251,7 +254,8 @@ namespace q {
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bool ematch::propagate(bool is_owned, euf::enode* const* binding, unsigned max_generation, clause& c, bool& propagated) {
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TRACE("q", c.display(ctx, tout) << "\n";);
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unsigned idx = UINT_MAX;
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lbool ev = m_eval(binding, c, idx);
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m_evidence.reset();
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lbool ev = m_eval(binding, c, idx, m_evidence);
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if (ev == l_true) {
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++m_stats.m_num_redundant;
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return true;
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@ -267,15 +271,18 @@ namespace q {
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if (ev == l_undef && max_generation > m_generation_propagation_threshold)
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return false;
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if (!is_owned)
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binding = alloc_binding(c, binding);
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auto j_idx = mk_justification(idx, c, binding);
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binding = alloc_binding(c, binding);
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auto j_idx = mk_justification(idx, c, binding);
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if (ev == l_false) {
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++m_stats.m_num_conflicts;
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ctx.set_conflict(j_idx);
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}
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else {
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++m_stats.m_num_propagations;
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ctx.propagate(instantiate(c, binding, c[idx]), j_idx);
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auto lit = instantiate(c, binding, c[idx]);
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ctx.propagate(lit, j_idx);
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}
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propagated = true;
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return true;
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@ -295,6 +302,7 @@ namespace q {
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}
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void ematch::add_instantiation(clause& c, binding& b, sat::literal lit) {
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m_evidence.reset();
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ctx.propagate(lit, mk_justification(UINT_MAX, c, b.nodes()));
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}
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@ -63,7 +63,7 @@ namespace q {
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quantifier_stat_gen m_qstat_gen;
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fingerprints m_fingerprints;
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scoped_ptr<binding> m_tmp_binding;
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unsigned m_tmp_binding_capacity { 0 };
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unsigned m_tmp_binding_capacity = 0;
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queue m_inst_queue;
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pattern_inference_rw m_infer_patterns;
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scoped_ptr<q::mam> m_mam, m_lazy_mam;
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@ -72,13 +72,14 @@ namespace q {
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vector<unsigned_vector> m_watch; // expr_id -> clause-index*
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stats m_stats;
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expr_fast_mark1 m_mark;
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unsigned m_generation_propagation_threshold{ 3 };
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unsigned m_generation_propagation_threshold = 3;
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ptr_vector<app> m_ground;
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bool m_in_queue_set{ false };
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bool m_in_queue_set = false;
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nat_set m_node_in_queue;
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nat_set m_clause_in_queue;
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unsigned m_qhead { 0 };
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unsigned m_qhead = 0;
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unsigned_vector m_clause_queue;
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euf::enode_pair_vector m_evidence;
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binding* alloc_binding(unsigned n, app* pat, unsigned max_generation, unsigned min_top, unsigned max_top);
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euf::enode* const* alloc_binding(clause& c, euf::enode* const* _binding);
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@ -115,7 +116,7 @@ namespace q {
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bool propagate(bool flush);
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void init_search();
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// void init_search();
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void add(quantifier* q);
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@ -127,7 +128,7 @@ namespace q {
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void on_binding(quantifier* q, app* pat, euf::enode* const* binding, unsigned max_generation, unsigned min_gen, unsigned max_gen);
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// callbacks from queue
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lbool evaluate(euf::enode* const* binding, clause& c) { return m_eval(binding, c); }
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lbool evaluate(euf::enode* const* binding, clause& c) { m_evidence.reset(); return m_eval(binding, c, m_evidence); }
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void add_instantiation(clause& c, binding& b, sat::literal lit);
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@ -32,7 +32,7 @@ namespace q {
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m(ctx.get_manager())
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{}
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lbool eval::operator()(euf::enode* const* binding, clause& c, unsigned& idx) {
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lbool eval::operator()(euf::enode* const* binding, clause& c, unsigned& idx, euf::enode_pair_vector& evidence) {
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scoped_mark_reset _sr(*this);
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idx = UINT_MAX;
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unsigned sz = c.m_lits.size();
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@ -41,7 +41,7 @@ namespace q {
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for (unsigned i = 0; i < sz; ++i) {
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unsigned lim = m_indirect_nodes.size();
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lit l = c[i];
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lbool cmp = compare(n, binding, l.lhs, l.rhs);
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lbool cmp = compare(n, binding, l.lhs, l.rhs, evidence);
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switch (cmp) {
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case l_false:
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m_indirect_nodes.shrink(lim);
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@ -75,46 +75,55 @@ namespace q {
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return l_undef;
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}
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lbool eval::operator()(euf::enode* const* binding, clause& c) {
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lbool eval::operator()(euf::enode* const* binding, clause& c, euf::enode_pair_vector& evidence) {
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unsigned idx = 0;
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return (*this)(binding, c, idx);
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return (*this)(binding, c, idx, evidence);
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}
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lbool eval::compare(unsigned n, euf::enode* const* binding, expr* s, expr* t) {
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lbool eval::compare(unsigned n, euf::enode* const* binding, expr* s, expr* t, euf::enode_pair_vector& evidence) {
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if (s == t)
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return l_true;
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if (m.are_distinct(s, t))
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return l_false;
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euf::enode* sn = (*this)(n, binding, s);
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euf::enode* tn = (*this)(n, binding, t);
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if (sn) sn = sn->get_root();
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if (tn) tn = tn->get_root();
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euf::enode* sn = (*this)(n, binding, s, evidence);
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euf::enode* tn = (*this)(n, binding, t, evidence);
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euf::enode* sr = sn ? sn->get_root() : sn;
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euf::enode* tr = tn ? tn->get_root() : tn;
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if (sn != sr) evidence.push_back(euf::enode_pair(sn, sr)), sn = sr;
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if (tn != tr) evidence.push_back(euf::enode_pair(tn, tr)), tn = tr;
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TRACE("q", tout << mk_pp(s, m) << " ~~ " << mk_pp(t, m) << "\n";
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tout << ctx.bpp(sn) << " " << ctx.bpp(tn) << "\n";);
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lbool c;
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if (sn && sn == tn)
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return l_true;
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if (sn && tn && ctx.get_egraph().are_diseq(sn, tn))
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if (sn && tn && ctx.get_egraph().are_diseq(sn, tn)) {
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evidence.push_back(euf::enode_pair(sn, tn));
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return l_false;
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}
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if (sn && tn)
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return l_undef;
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if (!sn && !tn)
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return compare_rec(n, binding, s, t);
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return compare_rec(n, binding, s, t, evidence);
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if (!tn && sn) {
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std::swap(tn, sn);
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std::swap(t, s);
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}
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for (euf::enode* t1 : euf::enode_class(tn))
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if (c = compare_rec(n, binding, s, t1->get_expr()), c != l_undef)
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unsigned sz = evidence.size();
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for (euf::enode* t1 : euf::enode_class(tn)) {
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if (c = compare_rec(n, binding, s, t1->get_expr(), evidence), c != l_undef) {
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evidence.push_back(euf::enode_pair(t1, tn));
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return c;
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}
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evidence.shrink(sz);
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}
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return l_undef;
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}
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// f(p1) = f(p2) if p1 = p2
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// f(p1) != f(p2) if p1 != p2 and f is injective
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lbool eval::compare_rec(unsigned n, euf::enode* const* binding, expr* s, expr* t) {
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lbool eval::compare_rec(unsigned n, euf::enode* const* binding, expr* s, expr* t, euf::enode_pair_vector& evidence) {
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if (m.are_equal(s, t))
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return l_true;
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if (m.are_distinct(s, t))
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@ -127,14 +136,20 @@ namespace q {
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return l_undef;
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bool is_injective = to_app(s)->get_decl()->is_injective();
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bool has_undef = false;
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unsigned sz = evidence.size();
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for (unsigned i = to_app(s)->get_num_args(); i-- > 0; ) {
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switch (compare(n, binding, to_app(s)->get_arg(i), to_app(t)->get_arg(i))) {
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unsigned sz1 = evidence.size(), sz2;
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switch (compare(n, binding, to_app(s)->get_arg(i), to_app(t)->get_arg(i), evidence)) {
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case l_true:
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break;
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case l_false:
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if (is_injective)
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return l_false;
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return l_undef;
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case l_false:
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if (!is_injective)
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return l_undef;
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sz2 = evidence.size();
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for (unsigned i = 0; i < sz2 - sz1; ++i)
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evidence[sz + i] = evidence[sz1 + i];
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evidence.shrink(sz + sz2 - sz1);
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return l_false;
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case l_undef:
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if (!is_injective)
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return l_undef;
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@ -142,10 +157,15 @@ namespace q {
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break;
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}
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}
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return has_undef ? l_undef : l_true;
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if (!has_undef)
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return l_true;
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evidence.shrink(sz);
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return l_undef;
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}
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euf::enode* eval::operator()(unsigned n, euf::enode* const* binding, expr* e) {
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euf::enode* eval::operator()(unsigned n, euf::enode* const* binding, expr* e, euf::enode_pair_vector& evidence) {
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if (is_ground(e))
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return ctx.get_egraph().find(e);
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if (m_mark.is_marked(e))
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@ -186,6 +206,15 @@ namespace q {
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euf::enode* n = ctx.get_egraph().find(t, args.size(), args.data());
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if (!n)
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return nullptr;
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for (unsigned i = args.size(); i-- > 0; ) {
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if (args[i] != n->get_arg(i)) {
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// roots could be different when using commutativity
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// instead of compensating for this, we just bail out
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if (args[i]->get_root() != n->get_arg(i)->get_root())
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return nullptr;
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evidence.push_back(euf::enode_pair(args[i], n->get_arg(i)));
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}
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}
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m_indirect_nodes.push_back(n);
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m_eval.setx(t->get_id(), n, nullptr);
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m_mark.mark(t);
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@ -195,99 +224,18 @@ namespace q {
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return m_eval[e->get_id()];
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}
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void eval::explain(clause& c, unsigned literal_idx, euf::enode* const* b) {
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unsigned n = c.num_decls();
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for (unsigned i = c.size(); i-- > 0; ) {
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if (i == literal_idx)
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continue;
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auto const& lit = c[i];
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if (lit.sign)
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explain_eq(n, b, lit.lhs, lit.rhs);
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else
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explain_diseq(n, b, lit.lhs, lit.rhs);
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}
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}
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void eval::explain_eq(unsigned n, euf::enode* const* binding, expr* s, expr* t) {
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SASSERT(l_true == compare(n, binding, s, t));
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if (s == t)
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return;
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euf::enode* sn = (*this)(n, binding, s);
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euf::enode* tn = (*this)(n, binding, t);
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if (sn && tn) {
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SASSERT(sn->get_root() == tn->get_root());
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ctx.add_antecedent(sn, tn);
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return;
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}
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if (!sn && tn) {
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std::swap(sn, tn);
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std::swap(s, t);
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}
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if (sn && !tn) {
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for (euf::enode* s1 : euf::enode_class(sn)) {
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if (l_true == compare_rec(n, binding, t, s1->get_expr())) {
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ctx.add_antecedent(sn, s1);
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explain_eq(n, binding, t, s1->get_expr());
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return;
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}
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}
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UNREACHABLE();
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}
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SASSERT(is_app(s) && is_app(t));
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SASSERT(to_app(s)->get_decl() == to_app(t)->get_decl());
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for (unsigned i = to_app(s)->get_num_args(); i-- > 0; )
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explain_eq(n, binding, to_app(s)->get_arg(i), to_app(t)->get_arg(i));
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}
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void eval::explain_diseq(unsigned n, euf::enode* const* binding, expr* s, expr* t) {
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SASSERT(l_false == compare(n, binding, s, t));
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if (m.are_distinct(s, t))
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return;
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euf::enode* sn = (*this)(n, binding, s);
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euf::enode* tn = (*this)(n, binding, t);
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if (sn && tn && ctx.get_egraph().are_diseq(sn, tn)) {
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ctx.add_diseq_antecedent(sn, tn);
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return;
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}
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if (!sn && tn) {
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std::swap(sn, tn);
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std::swap(s, t);
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}
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if (sn && !tn) {
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for (euf::enode* s1 : euf::enode_class(sn)) {
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if (l_false == compare_rec(n, binding, t, s1->get_expr())) {
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ctx.add_antecedent(sn, s1);
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explain_diseq(n, binding, t, s1->get_expr());
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return;
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}
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}
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UNREACHABLE();
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}
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SASSERT(is_app(s) && is_app(t));
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||||
app* at = to_app(t);
|
||||
app* as = to_app(s);
|
||||
SASSERT(as->get_decl() == at->get_decl());
|
||||
for (unsigned i = as->get_num_args(); i-- > 0; ) {
|
||||
if (l_false == compare_rec(n, binding, as->get_arg(i), at->get_arg(i))) {
|
||||
explain_eq(n, binding, as->get_arg(i), at->get_arg(i));
|
||||
return;
|
||||
}
|
||||
}
|
||||
UNREACHABLE();
|
||||
}
|
||||
|
||||
|
||||
void eval::explain(sat::literal l, justification& j, sat::literal_vector& r, bool probing) {
|
||||
scoped_mark_reset _sr(*this);
|
||||
unsigned l_idx = 0;
|
||||
clause& c = j.m_clause;
|
||||
for (; l_idx < c.size(); ++l_idx) {
|
||||
if (c[l_idx].lhs == j.m_lhs && c[l_idx].rhs == j.m_rhs && c[l_idx].sign == j.m_sign)
|
||||
break;
|
||||
for (unsigned i = 0; i < j.m_num_ev; ++i) {
|
||||
auto [a, b] = j.m_evidence[i];
|
||||
SASSERT(a->get_root() == b->get_root() || ctx.get_egraph().are_diseq(a, b));
|
||||
if (a->get_root() == b->get_root())
|
||||
ctx.add_antecedent(a, b);
|
||||
else
|
||||
ctx.add_diseq_antecedent(a, b);
|
||||
}
|
||||
explain(c, l_idx, j.m_binding);
|
||||
r.push_back(c.m_literal);
|
||||
(void)probing; // ignored
|
||||
(void)probing; // ignored
|
||||
}
|
||||
|
||||
|
||||
|
|
|
|||
|
|
@ -30,25 +30,20 @@ namespace q {
|
|||
expr_fast_mark1 m_mark;
|
||||
euf::enode_vector m_eval;
|
||||
euf::enode_vector m_indirect_nodes;
|
||||
ptr_vector<size_t> m_explain;
|
||||
|
||||
struct scoped_mark_reset;
|
||||
|
||||
void explain(clause& c, unsigned literal_idx, euf::enode* const* binding);
|
||||
void explain_eq(unsigned n, euf::enode* const* binding, expr* s, expr* t);
|
||||
void explain_diseq(unsigned n, euf::enode* const* binding, expr* s, expr* t);
|
||||
|
||||
// compare s, t modulo binding
|
||||
lbool compare(unsigned n, euf::enode* const* binding, expr* s, expr* t);
|
||||
lbool compare_rec(unsigned n, euf::enode* const* binding, expr* s, expr* t);
|
||||
lbool compare(unsigned n, euf::enode* const* binding, expr* s, expr* t, euf::enode_pair_vector& evidence);
|
||||
lbool compare_rec(unsigned n, euf::enode* const* binding, expr* s, expr* t, euf::enode_pair_vector& evidence);
|
||||
|
||||
public:
|
||||
eval(euf::solver& ctx);
|
||||
void explain(sat::literal l, justification& j, sat::literal_vector& r, bool probing);
|
||||
|
||||
lbool operator()(euf::enode* const* binding, clause& c);
|
||||
lbool operator()(euf::enode* const* binding, clause& c, unsigned& idx);
|
||||
euf::enode* operator()(unsigned n, euf::enode* const* binding, expr* e);
|
||||
lbool operator()(euf::enode* const* binding, clause& c, euf::enode_pair_vector& evidence);
|
||||
lbool operator()(euf::enode* const* binding, clause& c, unsigned& idx, euf::enode_pair_vector& evidence);
|
||||
euf::enode* operator()(unsigned n, euf::enode* const* binding, expr* e, euf::enode_pair_vector& evidence);
|
||||
|
||||
euf::enode_vector const& get_watch() { return m_indirect_nodes; }
|
||||
};
|
||||
|
|
|
|||
Loading…
Reference in a new issue