mirror of
https://github.com/Z3Prover/z3
synced 2025-04-30 04:15:51 +00:00
fix sat model converter to work with incrementality
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner
parent
a5b663c52d
commit
c199344bbf
8 changed files with 198 additions and 200 deletions
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@ -171,7 +171,7 @@ extern "C" {
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sat::solver solver(to_solver_ref(s)->get_params(), m.limit());
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parse_dimacs(is, solver);
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sat2goal s2g;
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model_converter_ref mc;
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ref<sat2goal::mc> mc;
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atom2bool_var a2b(m);
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goal g(m);
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s2g(solver, a2b, to_solver_ref(s)->get_params(), g, mc);
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@ -324,6 +324,11 @@ namespace sat {
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m_entries.append(src.m_entries);
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}
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void model_converter::flush(model_converter & src) {
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m_entries.append(src.m_entries);
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src.m_entries.reset();
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}
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void model_converter::collect_vars(bool_var_set & s) const {
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for (entry const & e : m_entries) s.insert(e.m_var);
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}
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@ -113,8 +113,12 @@ namespace sat {
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bool check_invariant(unsigned num_vars) const;
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void display(std::ostream & out) const;
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bool check_model(model const & m) const;
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void copy(model_converter const & src);
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/*
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\brief Append entries from src, then remove entries in src.
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*/
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void flush(model_converter& src);
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void collect_vars(bool_var_set & s) const;
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unsigned max_var(unsigned min) const;
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/*
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@ -351,6 +351,7 @@ namespace sat {
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bool model_is_current() const { return m_model_is_current; }
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literal_vector const& get_core() const { return m_core; }
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model_converter const & get_model_converter() const { return m_mc; }
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void flush(model_converter& mc) { mc.flush(m_mc); }
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void set_model(model const& mdl);
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char const* get_reason_unknown() const { return m_reason_unknown.c_str(); }
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bool check_clauses(model const& m) const;
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@ -61,7 +61,7 @@ class inc_sat_solver : public solver {
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proof_converter_ref m_pc;
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model_converter_ref m_mc;
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model_converter_ref m_mc0;
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model_converter_ref m_sat_mc;
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ref<sat2goal::mc> m_sat_mc;
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mutable model_converter_ref m_cached_mc;
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svector<double> m_weights;
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std::string m_unknown;
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@ -120,7 +120,7 @@ public:
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for (expr* f : m_internalized_fmls) result->m_internalized_fmls.push_back(tr(f));
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if (m_mc) result->m_mc = m_mc->translate(tr);
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if (m_mc0) result->m_mc0 = m_mc0->translate(tr);
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//if (m_sat_mc) result->m_sat_mc = m_sat_mc->translate(tr); MN: commenting this line removes bloat
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if (m_sat_mc) result->m_sat_mc = dynamic_cast<sat2goal::mc*>(m_sat_mc->translate(tr));
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// copy m_bb_rewriter?
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result->m_internalized_converted = m_internalized_converted;
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return result;
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@ -531,6 +531,11 @@ private:
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m_pc = g->pc();
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m_mc = g->mc();
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TRACE("sat", g->display_with_dependencies(tout););
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// ensure that if goal is already internalized, then import mc from m_solver.
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if (!m_sat_mc) m_sat_mc = alloc(sat2goal::mc, m);
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m_sat_mc->flush_smc(m_solver);
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m_goal2sat(*g, m_params, m_solver, m_map, dep2asm, is_incremental(), is_lemma);
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m_goal2sat.get_interpreted_atoms(atoms);
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if (!atoms.empty()) {
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@ -878,173 +878,135 @@ void goal2sat::get_interpreted_atoms(expr_ref_vector& atoms) {
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}
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sat2goal::mc::mc(ast_manager& m): m(m), m_var2expr(m) {}
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void sat2goal::mc::flush_smc(sat::solver& s) {
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s.flush(m_smc);
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}
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void sat2goal::mc::flush_gmc() {
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sat::literal_vector updates;
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m_smc.expand(updates);
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m_smc.reset();
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if (!m_gmc) m_gmc = alloc(generic_model_converter, m);
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// now gmc owns the model converter
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sat::literal_vector clause;
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expr_ref_vector tail(m);
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expr_ref def(m);
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for (sat::literal l : updates) {
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if (l == sat::null_literal) {
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sat::literal lit0 = clause[0];
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for (unsigned i = 1; i < clause.size(); ++i) {
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tail.push_back(lit2expr(~clause[i]));
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}
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def = m.mk_or(lit2expr(lit0), mk_and(tail));
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if (lit0.sign()) {
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lit0.neg();
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def = m.mk_not(def);
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}
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m_gmc->add(lit2expr(lit0), def);
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clause.reset();
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tail.reset();
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}
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else {
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clause.push_back(l);
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}
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}
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}
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model_converter* sat2goal::mc::translate(ast_translation& translator) {
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mc* result = alloc(mc, m);
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result->m_smc.copy(m_smc);
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result->m_gmc = m_gmc ? dynamic_cast<generic_model_converter*>(m_gmc->translate(translator)) : nullptr;
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for (app* e : m_var2expr) {
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result->m_var2expr.push_back(translator(e));
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}
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return result;
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}
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void sat2goal::mc::collect(ast_pp_util& visitor) {
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flush_gmc();
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collect(visitor);
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}
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void sat2goal::mc::display(std::ostream& out) {
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flush_gmc();
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if (m_gmc) m_gmc->display(out);
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}
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void sat2goal::mc::operator()(model_ref & md) {
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model_evaluator ev(*md);
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ev.set_model_completion(false);
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// create a SAT model using md
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sat::model sat_md;
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expr_ref val(m);
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for (expr * atom : m_var2expr) {
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if (!atom) {
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sat_md.push_back(l_undef);
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continue;
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}
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ev(atom, val);
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if (m.is_true(val))
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sat_md.push_back(l_true);
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else if (m.is_false(val))
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sat_md.push_back(l_false);
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else
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sat_md.push_back(l_undef);
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}
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// apply SAT model converter
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m_smc(sat_md);
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// register value of non-auxiliary boolean variables back into md
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unsigned sz = m_var2expr.size();
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for (sat::bool_var v = 0; v < sz; v++) {
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app * atom = m_var2expr.get(v);
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if (atom && is_uninterp_const(atom)) {
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func_decl * d = atom->get_decl();
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lbool new_val = sat_md[v];
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if (new_val == l_true)
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md->register_decl(d, m.mk_true());
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else if (new_val == l_false)
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md->register_decl(d, m.mk_false());
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}
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}
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// apply externalized model converter
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if (m_gmc) (*m_gmc)(md);
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TRACE("sat_mc", tout << "after sat_mc\n"; model_v2_pp(tout, *md););
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}
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void sat2goal::mc::operator()(expr_ref& fml) {
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flush_gmc();
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if (m_gmc) (*m_gmc)(fml);
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}
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void sat2goal::mc::insert(sat::bool_var v, app * atom, bool aux) {
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VERIFY(!m_var2expr.get(v, nullptr));
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m_var2expr.reserve(v + 1);
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m_var2expr.set(v, atom);
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if (aux) {
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SASSERT(is_uninterp_const(atom));
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SASSERT(m.is_bool(atom));
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if (!m_gmc) m_gmc = alloc(generic_model_converter, m);
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m_gmc->hide(atom->get_decl());
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}
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}
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expr_ref sat2goal::mc::lit2expr(sat::literal l) {
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VERIFY(m_var2expr.get(l.var()));
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expr_ref result(m_var2expr.get(l.var()), m);
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if (l.sign()) {
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result = m.mk_not(result);
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}
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return result;
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}
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struct sat2goal::imp {
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// Wrapper for sat::model_converter: converts it into an "AST level" model_converter.
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class sat_model_converter : public model_converter {
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model_converter_ref m_cached_mc;
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sat::model_converter m_mc;
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expr_ref_vector m_var2expr;
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generic_model_converter_ref m_fmc; // filter for eliminating fresh variables introduced in the assertion-set --> sat conversion
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generic_model_converter_ref m_imc; // used to ensure correctness in incremental calls with simplifications that require model conversions
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sat_model_converter(ast_manager & m):
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m_var2expr(m) {
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}
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void ensure_imc() {
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if (m_imc) return;
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m_imc = alloc(generic_model_converter, m());
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sat::literal_vector updates;
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m_mc.expand(updates);
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sat::literal_vector clause;
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expr_ref_vector tail(m());
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expr_ref def(m());
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for (sat::literal l : updates) {
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if (l == sat::null_literal) {
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sat::literal lit0 = clause[0];
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for (unsigned i = 1; i < clause.size(); ++i) {
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tail.push_back(lit2expr(~clause[i]));
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}
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def = m().mk_or(lit2expr(lit0), mk_and(tail));
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if (lit0.sign()) {
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lit0.neg();
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def = m().mk_not(def);
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}
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m_imc->add(lit2expr(lit0), def);
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clause.reset();
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tail.reset();
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}
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else {
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clause.push_back(l);
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}
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}
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}
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public:
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sat_model_converter(ast_manager & m, sat::solver const & s):m_var2expr(m) {
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m_mc.copy(s.get_model_converter());
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m_fmc = alloc(generic_model_converter, m);
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m_imc = nullptr;
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}
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ast_manager & m() { return m_var2expr.get_manager(); }
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void init(unsigned num_vars) {
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m_var2expr.resize(num_vars);
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}
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void insert(unsigned v, expr * atom, bool aux) {
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VERIFY(!m_var2expr.get(v));
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m_var2expr[v] = atom;
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if (aux) {
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SASSERT(is_uninterp_const(atom));
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SASSERT(m().is_bool(atom));
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m_fmc->hide(to_app(atom)->get_decl());
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}
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}
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void finish() {
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sat::literal_vector updates;
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m_mc.expand(updates);
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for (sat::literal l : updates) {
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if (l != sat::null_literal && !m_var2expr.get(l.var())) {
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insert(l.var(), m().mk_fresh_const(0, m().mk_bool_sort()), true);
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}
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}
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m_imc = nullptr;
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}
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virtual void operator()(model_ref & md) {
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TRACE("sat_mc", tout << "before sat_mc\n"; model_v2_pp(tout, *md); display(tout););
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// REMARK: potential problem
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// model_evaluator can't evaluate quantifiers. Then,
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// an eliminated variable that depends on a quantified expression can't be recovered.
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// A similar problem also affects any model_converter that uses elim_var_model_converter.
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//
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// Possible solution:
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// model_converters reject any variable elimination that depends on a quantified expression.
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model_evaluator ev(*md);
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ev.set_model_completion(false);
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// create a SAT model using md
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sat::model sat_md;
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expr_ref val(m());
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for (expr * atom : m_var2expr) {
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if (!atom) {
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sat_md.push_back(l_undef);
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continue;
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}
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ev(atom, val);
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if (m().is_true(val))
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sat_md.push_back(l_true);
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else if (m().is_false(val))
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sat_md.push_back(l_false);
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else
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sat_md.push_back(l_undef);
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}
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// apply SAT model converter
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m_mc(sat_md);
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// register value of non-auxiliary boolean variables back into md
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unsigned sz = m_var2expr.size();
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for (sat::bool_var v = 0; v < sz; v++) {
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expr * atom = m_var2expr.get(v);
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if (atom && is_uninterp_const(atom)) {
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func_decl * d = to_app(atom)->get_decl();
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lbool new_val = sat_md[v];
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if (new_val == l_true)
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md->register_decl(d, m().mk_true());
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else if (new_val == l_false)
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md->register_decl(d, m().mk_false());
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}
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}
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// apply filter model converter
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(*m_fmc)(md);
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TRACE("sat_mc", tout << "after sat_mc\n"; model_v2_pp(tout, *md););
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}
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virtual model_converter * translate(ast_translation & translator) {
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sat_model_converter * res = alloc(sat_model_converter, translator.to());
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res->m_mc = m_mc;
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res->m_fmc = static_cast<generic_model_converter*>(m_fmc->translate(translator));
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for (expr* e : m_var2expr)
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res->m_var2expr.push_back(e ? translator(e) : nullptr);
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return res;
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}
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expr_ref lit2expr(sat::literal l) {
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VERIFY(m_var2expr.get(l.var()));
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expr_ref result(m_var2expr.get(l.var()), m());
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if (l.sign()) {
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result = m().mk_not(result);
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}
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return result;
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}
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void display(std::ostream & out) {
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ensure_imc();
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m_imc->display(out);
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m_fmc->display(out);
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}
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virtual void collect(ast_pp_util& visitor) {
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m_env = &visitor.env();
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for (expr* e : m_var2expr) if (e) visitor.coll.visit(e);
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if (m_fmc) m_fmc->collect(visitor);
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ensure_imc();
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m_imc->collect(visitor);
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}
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void operator()(expr_ref& formula) override {
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ensure_imc();
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(*m_imc)(formula);
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}
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};
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typedef mc sat_model_converter;
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typedef ref<sat_model_converter> sat_model_converter_ref;
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ast_manager & m;
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@ -1073,12 +1035,11 @@ struct sat2goal::imp {
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m_lit2expr.resize(num_vars * 2);
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map.mk_inv(m_lit2expr);
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if (mc) {
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mc->init(num_vars);
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for (sat::bool_var v = 0; v < num_vars; v++) {
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checkpoint();
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checkpoint();
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sat::literal l(v, false);
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if (m_lit2expr.get(l.index())) {
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mc->insert(v, m_lit2expr.get(l.index()), false);
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mc->insert(v, to_app(m_lit2expr.get(l.index())), false);
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SASSERT(m_lit2expr.get((~l).index()));
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}
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}
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@ -1088,9 +1049,12 @@ struct sat2goal::imp {
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expr * lit2expr(sat_model_converter_ref& mc, sat::literal l) {
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if (!m_lit2expr.get(l.index())) {
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SASSERT(m_lit2expr.get((~l).index()) == 0);
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app * aux = m.mk_fresh_const(0, m.mk_bool_sort());
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if (mc)
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mc->insert(l.var(), aux, true);
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app* aux = mc ? mc->var2expr(l.var()) : nullptr;
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if (!aux) {
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aux = m.mk_fresh_const(0, m.mk_bool_sort());
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if (mc)
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mc->insert(l.var(), aux, true);
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}
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m_lit2expr.set(l.index(), aux);
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m_lit2expr.set((~l).index(), m.mk_not(aux));
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}
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@ -1160,27 +1124,26 @@ struct sat2goal::imp {
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return dynamic_cast<sat::ba_solver*>(s.get_extension());
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}
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void operator()(sat::solver const & s, atom2bool_var const & map, goal & r, model_converter_ref & mc) {
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void operator()(sat::solver & s, atom2bool_var const & map, goal & r, ref<mc> & mc) {
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if (s.inconsistent()) {
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r.assert_expr(m.mk_false());
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return;
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}
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ref<sat_model_converter> _mc;
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if (r.models_enabled()) {
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_mc = alloc(sat_model_converter, m, s);
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mc = _mc.get();
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if (r.models_enabled() && !mc) {
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mc = alloc(sat_model_converter, m);
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}
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init_lit2expr(s, map, _mc);
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if (mc) mc->flush_smc(s);
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init_lit2expr(s, map, mc);
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// collect units
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unsigned num_vars = s.num_vars();
|
||||
for (sat::bool_var v = 0; v < num_vars; v++) {
|
||||
checkpoint();
|
||||
switch (s.value(v)) {
|
||||
case l_true:
|
||||
r.assert_expr(lit2expr(_mc, sat::literal(v, false)));
|
||||
r.assert_expr(lit2expr(mc, sat::literal(v, false)));
|
||||
break;
|
||||
case l_false:
|
||||
r.assert_expr(lit2expr(_mc, sat::literal(v, true)));
|
||||
r.assert_expr(lit2expr(mc, sat::literal(v, true)));
|
||||
break;
|
||||
case l_undef:
|
||||
break;
|
||||
|
|
@ -1191,28 +1154,27 @@ struct sat2goal::imp {
|
|||
s.collect_bin_clauses(bin_clauses, m_learned);
|
||||
for (sat::solver::bin_clause const& bc : bin_clauses) {
|
||||
checkpoint();
|
||||
r.assert_expr(m.mk_or(lit2expr(_mc, bc.first), lit2expr(_mc, bc.second)));
|
||||
r.assert_expr(m.mk_or(lit2expr(mc, bc.first), lit2expr(mc, bc.second)));
|
||||
}
|
||||
// collect clauses
|
||||
assert_clauses(_mc, s, s.clauses(), r, true);
|
||||
assert_clauses(mc, s, s.clauses(), r, true);
|
||||
|
||||
sat::ba_solver* ext = get_ba_solver(s);
|
||||
if (ext) {
|
||||
for (auto* c : ext->constraints()) {
|
||||
switch (c->tag()) {
|
||||
case sat::ba_solver::card_t:
|
||||
assert_card(_mc, r, c->to_card());
|
||||
assert_card(mc, r, c->to_card());
|
||||
break;
|
||||
case sat::ba_solver::pb_t:
|
||||
assert_pb(_mc, r, c->to_pb());
|
||||
assert_pb(mc, r, c->to_pb());
|
||||
break;
|
||||
case sat::ba_solver::xor_t:
|
||||
assert_xor(_mc, r, c->to_xor());
|
||||
assert_xor(mc, r, c->to_xor());
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
if (_mc) _mc->finish();
|
||||
}
|
||||
|
||||
void add_clause(sat_model_converter_ref& mc, sat::literal_vector const& lits, expr_ref_vector& lemmas) {
|
||||
|
|
@ -1255,8 +1217,8 @@ struct sat2goal::scoped_set_imp {
|
|||
}
|
||||
};
|
||||
|
||||
void sat2goal::operator()(sat::solver const & t, atom2bool_var const & m, params_ref const & p,
|
||||
goal & g, model_converter_ref & mc) {
|
||||
void sat2goal::operator()(sat::solver & t, atom2bool_var const & m, params_ref const & p,
|
||||
goal & g, ref<mc> & mc) {
|
||||
imp proc(g.m(), p);
|
||||
scoped_set_imp set(this, &proc);
|
||||
proc(t, m, g, mc);
|
||||
|
|
|
|||
|
|
@ -32,6 +32,7 @@ Notes:
|
|||
#include "tactic/goal.h"
|
||||
#include "sat/sat_solver.h"
|
||||
#include "tactic/model_converter.h"
|
||||
#include "tactic/generic_model_converter.h"
|
||||
#include "sat/tactic/atom2bool_var.h"
|
||||
|
||||
class goal2sat {
|
||||
|
|
@ -73,8 +74,35 @@ class sat2goal {
|
|||
imp * m_imp;
|
||||
struct scoped_set_imp;
|
||||
public:
|
||||
|
||||
class mc : public model_converter {
|
||||
ast_manager& m;
|
||||
sat::model_converter m_smc;
|
||||
generic_model_converter_ref m_gmc;
|
||||
app_ref_vector m_var2expr;
|
||||
|
||||
// flushes from m_smc to m_gmc;
|
||||
void flush_gmc();
|
||||
|
||||
public:
|
||||
mc(ast_manager& m);
|
||||
virtual ~mc() {}
|
||||
// flush model converter from SAT solver to this structure.
|
||||
void flush_smc(sat::solver& s);
|
||||
void operator()(model_ref& md) override;
|
||||
void operator()(expr_ref& fml) override;
|
||||
model_converter* translate(ast_translation& translator) override;
|
||||
void collect(ast_pp_util& visitor) override;
|
||||
void display(std::ostream& out) override;
|
||||
|
||||
app* var2expr(sat::bool_var v) const { return m_var2expr.get(v, nullptr); }
|
||||
expr_ref lit2expr(sat::literal l);
|
||||
void insert(sat::bool_var v, app * atom, bool aux);
|
||||
};
|
||||
|
||||
sat2goal();
|
||||
|
||||
|
||||
static void collect_param_descrs(param_descrs & r);
|
||||
|
||||
/**
|
||||
|
|
@ -85,14 +113,7 @@ public:
|
|||
\warning conversion throws a tactic_exception, if it is interrupted (by set_cancel),
|
||||
or memory consumption limit is reached (set with param :max-memory).
|
||||
*/
|
||||
void operator()(sat::solver const & t, atom2bool_var const & m, params_ref const & p, goal & s, model_converter_ref & mc);
|
||||
|
||||
|
||||
/**
|
||||
\brief extract learned clauses only that are in the domain of m.
|
||||
|
||||
*/
|
||||
void get_learned(sat::solver const& s, atom2bool_var const& m, params_ref const& p, expr_ref_vector& learned);
|
||||
void operator()(sat::solver & t, atom2bool_var const & m, params_ref const & p, goal & s, ref<mc> & mc);
|
||||
|
||||
};
|
||||
|
||||
|
|
|
|||
|
|
@ -108,7 +108,7 @@ class sat_tactic : public tactic {
|
|||
IF_VERBOSE(TACTIC_VERBOSITY_LVL, verbose_stream() << "\"formula constains interpreted atoms, recovering formula from sat solver...\"\n";);
|
||||
#endif
|
||||
m_solver.pop_to_base_level();
|
||||
model_converter_ref mc;
|
||||
ref<sat2goal::mc> mc;
|
||||
m_sat2goal(m_solver, map, m_params, *(g.get()), mc);
|
||||
g->add(mc.get());
|
||||
}
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue