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https://github.com/Z3Prover/z3
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prepare for theory plugins
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner
parent
141edef0d6
commit
116390833b
27 changed files with 492 additions and 336 deletions
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@ -35,7 +35,7 @@ namespace euf {
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void undo(egraph & ctx) override {
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theory_var v = m_enode->get_th_var(m_th_id);
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SASSERT(v != null_var);
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SASSERT(v != null_theory_var);
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m_enode->del_th_var(m_th_id);
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enode * root = m_enode->get_root();
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if (root != m_enode && root->get_th_var(m_th_id) == v)
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@ -43,6 +43,26 @@ namespace euf {
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}
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};
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/**
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\brief Trail for replace_th_var
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*/
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class replace_th_var_trail : public trail<egraph> {
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enode * m_enode;
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unsigned m_th_id:8;
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unsigned m_old_th_var:24;
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public:
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replace_th_var_trail(enode * n, theory_id th_id, theory_var old_var):
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m_enode(n),
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m_th_id(th_id),
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m_old_th_var(old_var) {
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}
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void undo(egraph & ctx) override {
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SASSERT(m_enode->get_th_var(m_th_id) != null_theory_var);
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m_enode->replace_th_var(m_old_th_var, m_th_id);
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}
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};
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void egraph::undo_eq(enode* r1, enode* n1, unsigned r2_num_parents) {
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enode* r2 = r1->get_root();
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r2->dec_class_size(r1->class_size());
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@ -84,7 +104,7 @@ namespace euf {
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void egraph::reinsert_equality(enode* p) {
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SASSERT(is_equality(p));
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if (p->get_arg(0)->get_root() == p->get_arg(1)->get_root()) {
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m_new_eqs.push_back(p);
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m_new_lits.push_back(enode_bool_pair(p, true));
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++m_stats.m_num_eqs;
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}
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}
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@ -93,25 +113,17 @@ namespace euf {
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return m.is_eq(p->get_owner());
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}
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void egraph::dedup_equalities() {
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unsigned j = 0;
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for (enode* p : m_new_eqs) {
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if (!p->is_marked1())
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m_new_eqs[j++] = p;
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p->mark1();
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}
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for (enode* p : m_new_eqs)
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p->unmark1();
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m_new_eqs.shrink(j);
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}
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void egraph::force_push() {
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for (; m_num_scopes > 0; --m_num_scopes) {
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scope s;
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s.m_inconsistent = m_inconsistent;
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s.m_num_eqs = m_eqs.size();
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s.m_num_nodes = m_nodes.size();
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s.m_trail_sz = m_trail.size();
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s.m_trail_sz = m_trail.size();
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s.m_new_lits_sz = m_new_lits.size();
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s.m_new_th_eqs_sz = m_new_th_eqs.size();
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s.m_new_lits_qhead = m_new_lits_qhead;
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s.m_new_th_eqs_qhead = m_new_th_eqs_qhead;
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m_scopes.push_back(s);
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m_region.push_scope();
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}
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@ -160,10 +172,27 @@ namespace euf {
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void egraph::add_th_var(enode* n, theory_var v, theory_id id) {
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force_push();
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SASSERT(null_var == n->get_th_var(id));
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SASSERT(n->class_size() == 1);
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n->add_th_var(v, id, m_region);
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m_trail.push_back(new (m_region) add_th_var_trail(n, id));
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theory_var w = n->get_th_var(id);
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enode* r = n->get_root();
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if (w == null_theory_var) {
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n->add_th_var(v, id, m_region);
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m_trail.push_back(new (m_region) add_th_var_trail(n, id));
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if (r != n) {
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theory_var u = r->get_th_var(id);
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if (u == null_theory_var)
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r->add_th_var(v, id, m_region);
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else
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m_new_th_eqs.push_back(th_eq(id, v, u, n, r));
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}
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}
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else {
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theory_var u = r->get_th_var(id);
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SASSERT(u != v && u != null_theory_var);
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n->replace_th_var(v, id);
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m_trail.push_back(new (m_region) replace_th_var_trail(n, id, u));
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m_new_th_eqs.push_back(th_eq(id, v, u, n, r));
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}
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}
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void egraph::pop(unsigned num_scopes) {
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@ -187,9 +216,13 @@ namespace euf {
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}
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undo_trail_stack<egraph>(*this, m_trail, s.m_trail_sz);
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m_inconsistent = s.m_inconsistent;
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m_new_lits_qhead = s.m_new_lits_qhead;
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m_new_th_eqs_qhead = s.m_new_th_eqs_qhead;
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m_eqs.shrink(s.m_num_eqs);
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m_nodes.shrink(s.m_num_nodes);
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m_exprs.shrink(s.m_num_nodes);
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m_new_lits.shrink(s.m_new_lits_sz);
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m_new_th_eqs.shrink(s.m_new_th_eqs_sz);
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m_scopes.shrink(old_lim);
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m_region.pop_scope(num_scopes);
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}
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@ -212,7 +245,7 @@ namespace euf {
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std::swap(n1, n2);
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}
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if ((m.is_true(r2->get_owner()) || m.is_false(r2->get_owner())) && j.is_congruence()) {
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m_new_lits.push_back(n1);
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m_new_lits.push_back(enode_pair(n1, false));
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++m_stats.m_num_lits;
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}
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for (enode* p : enode_parents(n1))
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@ -235,7 +268,7 @@ namespace euf {
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for (auto iv : enode_th_vars(n)) {
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theory_id id = iv.get_id();
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theory_var v = root->get_th_var(id);
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if (v == null_var) {
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if (v == null_theory_var) {
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root->add_th_var(iv.get_var(), id, m_region);
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m_trail.push_back(new (m_region) add_th_var_trail(root, id));
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}
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@ -246,10 +279,7 @@ namespace euf {
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}
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}
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void egraph::propagate() {
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m_new_eqs.reset();
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m_new_lits.reset();
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m_new_th_eqs.reset();
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bool egraph::propagate() {
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SASSERT(m_num_scopes == 0 || m_worklist.empty());
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unsigned head = 0, tail = m_worklist.size();
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while (head < tail && m.limit().inc() && !inconsistent()) {
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@ -267,7 +297,10 @@ namespace euf {
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tail = m_worklist.size();
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}
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m_worklist.reset();
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dedup_equalities();
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return
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(m_new_lits_qhead < m_new_lits.size()) ||
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(m_new_th_eqs_qhead < m_new_th_eqs.size()) ||
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inconsistent();
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}
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void egraph::set_conflict(enode* n1, enode* n2, justification j) {
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