mirror of
https://github.com/Z3Prover/z3
synced 2025-04-28 19:35:50 +00:00
fixing bugs in seq
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner
parent
993a0434b4
commit
924f03c6de
5 changed files with 173 additions and 154 deletions
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@ -383,7 +383,7 @@ br_status seq_rewriter::mk_seq_extract(expr* a, expr* b, expr* c, expr_ref& resu
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zstring s;
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rational pos, len;
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if (m_util.str.is_string(a, s) && m_autil.is_numeral(b, pos) && m_autil.is_numeral(c, len) &&
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pos.is_unsigned() && len.is_unsigned() && pos.get_unsigned() <= s.length()) {
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pos.is_unsigned() && len.is_unsigned() && pos.get_unsigned() + len.get_unsigned() <= s.length()) {
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unsigned _pos = pos.get_unsigned();
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unsigned _len = len.get_unsigned();
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result = m_util.str.mk_string(s.extract(_pos, _len));
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@ -554,7 +554,11 @@ func_decl * seq_decl_plugin::mk_func_decl(decl_kind k, unsigned num_parameters,
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parameter param(symbol(""));
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return mk_func_decl(OP_STRING_CONST, 1, ¶m, 0, 0, m_string);
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}
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return m.mk_func_decl(m_sigs[k]->m_name, arity, domain, rng, func_decl_info(m_family_id, k));
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else {
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parameter param(rng.get());
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func_decl_info info(m_family_id, k, 1, ¶m);
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return m.mk_func_decl(m_sigs[k]->m_name, arity, domain, rng, info);
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}
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case OP_SEQ_UNIT:
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case OP_RE_PLUS:
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@ -1638,6 +1638,7 @@ void cmd_context::validate_model() {
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catch (contains_array_op_proc::found) {
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continue;
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}
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TRACE("model_validate", model_smt2_pp(tout, *this, *(md.get()), 0););
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throw cmd_exception("an invalid model was generated");
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}
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}
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@ -844,7 +844,6 @@ bool theory_seq::solve_eqs(unsigned i) {
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change = true;
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}
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}
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TRACE("seq", tout << "solve_eqs\n";);
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return change || ctx.inconsistent();
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}
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@ -1162,7 +1161,7 @@ bool theory_seq::internalize_term(app* term) {
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mk_var(e);
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return true;
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}
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TRACE("seq", tout << mk_pp(term, m) << "\n";);
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TRACE("seq_verbose", tout << mk_pp(term, m) << "\n";);
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unsigned num_args = term->get_num_args();
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expr* arg;
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for (unsigned i = 0; i < num_args; i++) {
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@ -1332,147 +1331,116 @@ void theory_seq::init_model(model_generator & mg) {
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}
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}
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class unit_wrapper_proc : public model_value_proc {
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theory_seq& th;
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model_value_dependency m_dep;
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public:
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unit_wrapper_proc(theory_seq& th, model_value_dependency d, expr* n): th(th), m_dep(d) {}
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virtual app * mk_value(model_generator & mg, ptr_vector<expr> & values) {
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SASSERT(values.size() == 1);
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bv_util bv(th.m);
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rational val;
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unsigned sz;
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if (bv.is_numeral(values[0], val, sz) && sz == zstring().num_bits()) {
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unsigned v = val.get_unsigned();
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svector<bool> val_as_bits;
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for (unsigned i = 0; i < sz; ++i) {
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val_as_bits.push_back(1 == v % 2);
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v = v / 2;
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}
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return m_util.str.mk_string(zstring(sz, val_as_bits.c_ptr()));
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}
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else {
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return th.m_util.str.mk_unit(values[0]);
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}
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}
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virtual void get_dependencies(buffer<model_value_dependency> & result) {
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result.push_back(m_dep);
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}
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};
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class seq_value_proc : public model_value_proc {
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theory_seq& th;
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app* n;
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svector<model_value_dependency> m_dependencies;
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ptr_vector<expr> m_strings;
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svector<bool> m_source;
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public:
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seq_value_proc(theory_seq& th, app* n): th(th), n(n) {
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}
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virtual ~seq_value_proc() {}
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void add_dependency(enode* n) { m_dependencies.push_back(model_value_dependency(n)); }
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void add_dependency(enode* n) {
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m_dependencies.push_back(model_value_dependency(n));
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m_source.push_back(true);
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}
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void add_string(expr* n) {
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m_strings.push_back(n);
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m_source.push_back(false);
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}
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virtual void get_dependencies(buffer<model_value_dependency> & result) {
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result.append(m_dependencies.size(), m_dependencies.c_ptr());
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}
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virtual app * mk_value(model_generator & mg, ptr_vector<expr> & values) {
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SASSERT(values.size() == m_dependencies.size());
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if (values.empty()) {
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ptr_vector<expr> args;
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unsigned j = 0, k = 0;
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for (unsigned i = 0; i < m_source.size(); ++i) {
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if (m_source[i]) {
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args.push_back(values[j++]);
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}
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else {
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args.push_back(m_strings[k++]);
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}
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}
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if (args.empty()) {
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return th.mk_value(n);
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}
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return th.mk_value(mg.get_manager().mk_app(n->get_decl(), values.size(), values.c_ptr()));
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return th.mk_value(mg.get_manager().mk_app(n->get_decl(), args.size(), args.c_ptr()));
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}
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};
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model_value_proc * theory_seq::mk_value(enode * n, model_generator & mg) {
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context& ctx = get_context();
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expr_ref e(m);
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expr* e1;
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ptr_vector<expr> concats;
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get_concat(n->get_owner(), concats);
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switch (concats.size()) {
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case 0:
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e = m_util.str.mk_empty(m.get_sort(n->get_owner()));
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break;
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case 1:
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e = concats[0];
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SASSERT(!m_util.str.is_concat(e));
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break;
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default:
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e = m_rep.find(n->get_owner());
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SASSERT(m_util.str.is_concat(e));
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break;
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}
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seq_value_proc* sv = alloc(seq_value_proc, *this, to_app(e));
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TRACE("seq", tout << mk_pp(n->get_owner(), m) << " ";
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for (unsigned i = 0; i < concats.size(); ++i) {
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tout << mk_pp(concats[i], m) << " ";
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}
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tout << "\n";
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);
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expr* e1, *e2;
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if (concats.size() > 1) {
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for (unsigned i = 0; i < concats.size(); ++i) {
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expr* e = concats[i];
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if (!m_util.str.is_string(e)) {
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sv->add_dependency(ctx.get_enode(e));
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}
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}
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e = m_rep.find(n->get_owner());
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if (m_util.str.is_concat(e, e1, e2)) {
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context& ctx = get_context();
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seq_value_proc* sv = alloc(seq_value_proc, *this, to_app(e));
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// e = e1 .. en
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// those that are units, those that are not units.
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// e = unit(e1) +
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return sv;
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}
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else if (m_util.str.is_unit(e, e1)) {
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sv->add_dependency(ctx.get_enode(e1));
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return alloc(unit_wrapper_proc, *this, ctx.get_enode(e1));
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}
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else {
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return alloc(expr_wrapper_proc, mk_value(e));
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}
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return sv;
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}
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void theory_seq::get_concat(expr* e, ptr_vector<expr>& concats) {
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expr* e1, *e2;
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while (true) {
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e = m_rep.find(e);
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if (m_util.str.is_concat(e, e1, e2)) {
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get_concat(e1, concats);
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e = e2;
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continue;
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}
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if (!m_util.str.is_empty(e)) {
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concats.push_back(e);
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}
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return;
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}
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}
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app* theory_seq::mk_value(app* e) {
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expr* e1;
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expr_ref result(e, m);
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if (m_util.str.is_unit(e, e1)) {
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dependency* deps = 0;
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result = expand(e1, deps);
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bv_util bv(m);
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rational val;
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unsigned sz;
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if (bv.is_numeral(result, val, sz) && sz == zstring().num_bits()) {
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unsigned v = val.get_unsigned();
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if (false && ((v < 7) || (14 <= v && v < 32) || v == 127)) {
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// disabled: use escape characters.
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result = m_util.str.mk_unit(result);
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}
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else {
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svector<bool> val_as_bits;
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for (unsigned i = 0; i < sz; ++i) {
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val_as_bits.push_back(1 == v % 2);
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v = v / 2;
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}
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result = m_util.str.mk_string(zstring(sz, val_as_bits.c_ptr()));
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}
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}
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else {
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result = m_util.str.mk_unit(result);
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}
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}
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else if (is_var(e)) {
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result = m_rep.find(e);
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if (is_var(result)) {
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SASSERT(m_factory);
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expr_ref val(m);
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val = m_factory->get_some_value(m.get_sort(e));
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val = m_factory->get_some_value(m.get_sort(result));
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if (val) {
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result = val;
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}
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else {
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result = e;
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}
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}
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else if (is_nth(e)) {
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enode* n = get_context().get_enode(e)->get_root();
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enode* n0 = n;
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bool found_value = false;
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do {
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result = n->get_owner();
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found_value = m.is_model_value(result);
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}
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while (n0 != n && !found_value);
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if (!found_value) {
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if (m_util.is_char(result)) {
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result = m_util.str.mk_char('#');
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}
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else {
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result = m_mg->get_some_value(m.get_sort(result));
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}
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}
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else {
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m_rewrite(result);
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}
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m_rewrite(result);
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m_factory->add_trail(result);
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TRACE("seq", tout << mk_pp(e, m) << " -> " << result << "\n";);
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m_rep.update(e, result, 0);
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return to_app(result);
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}
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@ -1639,19 +1607,19 @@ void theory_seq::deque_axiom(expr* n) {
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/*
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encode that s is not a proper prefix of xs1
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encode that s is not contained in of xs1
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where s1 is all of s, except the last element.
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lit or s = "" or s = s1*(unit c)
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lit or s = "" or !prefix(s, x*s1)
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lit or s = "" or !contains(x*s1, s)
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*/
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void theory_seq::tightest_prefix(expr* s, expr* x, literal lit1, literal lit2) {
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expr_ref s1 = mk_first(s);
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expr_ref c = mk_last(s);
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expr_ref s1c = mk_concat(s1, m_util.str.mk_unit(c));
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literal s_eq_emp = mk_eq_empty(s);
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add_axiom(lit1, lit2, s_eq_emp, mk_eq(s, s1c, false));
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add_axiom(lit1, lit2, s_eq_emp, ~mk_literal(m_util.str.mk_prefix(s, mk_concat(x, s1))));
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add_axiom(s_eq_emp, mk_eq(s, s1c, false));
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add_axiom(lit1, lit2, s_eq_emp, ~mk_literal(m_util.str.mk_contains(mk_concat(x, s1), s)));
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}
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/*
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@ -1692,15 +1660,17 @@ void theory_seq::add_indexof_axiom(expr* i) {
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if (!offset || (m_autil.is_numeral(offset, r) && r.is_zero())) {
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expr_ref x = mk_skolem(m_contains_left, t, s);
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expr_ref y = mk_skolem(m_contains_right, t, s);
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expr_ref x = mk_skolem(m_indexof_left, t, s);
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expr_ref y = mk_skolem(m_indexof_right, t, s);
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xsy = mk_concat(x, s, y);
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expr_ref lenx(m_util.str.mk_length(x), m);
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literal cnt = mk_literal(m_util.str.mk_contains(t, s));
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literal eq_empty = mk_eq_empty(s);
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literal s_eq_empty = mk_eq_empty(s);
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add_axiom(cnt, mk_eq(i, minus_one, false));
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add_axiom(~eq_empty, mk_eq(i, zero, false));
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add_axiom(eq_empty, ~mk_eq_empty(t), mk_eq(i, minus_one, false));
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add_axiom(~cnt, eq_empty, mk_eq(t, xsy, false));
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add_axiom(~s_eq_empty, mk_eq(i, zero, false));
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add_axiom(s_eq_empty, ~mk_eq_empty(t), mk_eq(i, minus_one, false));
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add_axiom(~cnt, s_eq_empty, mk_eq(t, xsy, false));
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add_axiom(~cnt, s_eq_empty, mk_eq(i, lenx, false));
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tightest_prefix(s, x, ~cnt);
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}
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else {
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@ -1743,8 +1713,8 @@ void theory_seq::add_indexof_axiom(expr* i) {
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void theory_seq::add_replace_axiom(expr* r) {
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expr* a, *s, *t;
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VERIFY(m_util.str.is_replace(r, a, s, t));
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expr_ref x = mk_skolem(m_contains_left, a, s);
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expr_ref y = mk_skolem(m_contains_right, a, s);
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expr_ref x = mk_skolem(m_indexof_left, a, s);
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expr_ref y = mk_skolem(m_indexof_right, a, s);
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expr_ref xty = mk_concat(x, t, y);
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expr_ref xsy = mk_concat(x, s, y);
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literal cnt = mk_literal(m_util.str.mk_contains(a ,s));
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@ -1965,12 +1935,16 @@ bool theory_seq::get_length(expr* e, rational& val) {
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let e = extract(s, i, l)
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0 <= i < len(s) -> prefix(xe,s) & len(x) = i
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0 <= i < len(s) & l >= len(s) - i -> len(e) = len(s) - i
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0 <= i < len(s) & 0 <= l < len(s) - i -> len(e) = l
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0 <= i < len(s) & l < 0 -> len(e) = 0
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* i < 0 -> e = s
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* i >= len(s) -> e = empty
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0 <= i <= len(s) -> prefix(xe,s)
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0 <= i <= len(s) -> len(x) = i
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0 <= i <= len(s) & 0 <= l <= len(s) - i -> len(e) = l
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0 <= i <= len(s) & len(s) < l + i -> len(e) = len(s) - i
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0 <= i <= len(s) & l < 0 -> len(e) = 0
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* i < 0 -> e = empty
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* i > len(s) -> e = empty
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*/
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void theory_seq::add_extract_axiom(expr* e) {
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@ -1984,15 +1958,16 @@ void theory_seq::add_extract_axiom(expr* e) {
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expr_ref xe = mk_concat(x, e);
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expr_ref zero(m_autil.mk_int(0), m);
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literal i_ge_0 = mk_literal(m_autil.mk_ge(i, zero));
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literal i_ge_ls = mk_literal(m_autil.mk_ge(mk_sub(i, ls), zero));
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literal li_ge_ls = mk_literal(m_autil.mk_ge(ls_minus_i_l, zero));
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literal i_ge_0 = mk_literal(m_autil.mk_ge(i, zero));
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literal i_le_ls = mk_literal(m_autil.mk_le(mk_sub(i, ls), zero));
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literal li_ge_ls = mk_literal(m_autil.mk_ge(ls_minus_i_l, zero));
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literal l_ge_zero = mk_literal(m_autil.mk_ge(l, zero));
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add_axiom(~i_ge_0, i_ge_ls, mk_literal(m_util.str.mk_prefix(xe, s)));
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add_axiom(~i_ge_0, i_ge_ls, mk_eq(lx, i, false));
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add_axiom(~i_ge_0, i_ge_ls, ~li_ge_ls, mk_eq(le, l, false));
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add_axiom(~i_ge_0, i_ge_ls, l_ge_zero, mk_eq(le, zero, false));
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add_axiom(~i_ge_0, ~i_le_ls, mk_literal(m_util.str.mk_prefix(xe, s)));
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add_axiom(~i_ge_0, ~i_le_ls, mk_eq(lx, i, false));
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add_axiom(~i_ge_0, ~i_le_ls, ~l_ge_zero, ~li_ge_ls, mk_eq(le, l, false));
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add_axiom(~i_ge_0, ~i_le_ls, li_ge_ls, mk_eq(le, mk_sub(ls, i), false));
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add_axiom(~i_ge_0, ~i_le_ls, l_ge_zero, mk_eq(le, zero, false));
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}
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/*
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@ -2098,14 +2073,15 @@ literal theory_seq::mk_eq_empty(expr* _e) {
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return mk_equals(e, emp);
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}
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void theory_seq::add_axiom(literal l1, literal l2, literal l3, literal l4) {
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void theory_seq::add_axiom(literal l1, literal l2, literal l3, literal l4, literal l5) {
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context& ctx = get_context();
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literal_vector lits;
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if (l1 == true_literal || l2 == true_literal || l3 == true_literal || l4 == true_literal) return;
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if (l1 == true_literal || l2 == true_literal || l3 == true_literal || l4 == true_literal || l5 == true_literal) return;
|
||||
if (l1 != null_literal && l1 != false_literal) { ctx.mark_as_relevant(l1); lits.push_back(l1); }
|
||||
if (l2 != null_literal && l2 != false_literal) { ctx.mark_as_relevant(l2); lits.push_back(l2); }
|
||||
if (l3 != null_literal && l3 != false_literal) { ctx.mark_as_relevant(l3); lits.push_back(l3); }
|
||||
if (l4 != null_literal && l4 != false_literal) { ctx.mark_as_relevant(l4); lits.push_back(l4); }
|
||||
if (l5 != null_literal && l5 != false_literal) { ctx.mark_as_relevant(l5); lits.push_back(l5); }
|
||||
TRACE("seq", ctx.display_literals_verbose(tout << "axiom: ", lits.size(), lits.c_ptr()); tout << "\n";);
|
||||
m_new_propagation = true;
|
||||
++m_stats.m_add_axiom;
|
||||
|
|
@ -2638,9 +2614,10 @@ bool theory_seq::add_prefix2prefix(expr* e) {
|
|||
if (canonizes(false, e)) {
|
||||
return false;
|
||||
}
|
||||
expr_ref emp(m_util.str.mk_empty(m.get_sort(e1)), m);
|
||||
literal e2_is_emp = mk_eq_empty(e2);
|
||||
switch (ctx.get_assignment(e2_is_emp)) {
|
||||
expr_ref head1(m), tail1(m), head2(m), tail2(m), conc(m);
|
||||
|
||||
literal e1_is_emp = mk_eq_empty(e1);
|
||||
switch (ctx.get_assignment(e1_is_emp)) {
|
||||
case l_true:
|
||||
return false; // done
|
||||
case l_undef:
|
||||
|
|
@ -2649,29 +2626,41 @@ bool theory_seq::add_prefix2prefix(expr* e) {
|
|||
break;
|
||||
}
|
||||
|
||||
expr_ref head1(m), tail1(m), head2(m), tail2(m), conc(m);
|
||||
mk_decompose(e1, head1, tail1);
|
||||
conc = mk_concat(head1, tail1);
|
||||
propagate_eq(~e1_is_emp, e1, conc, true);
|
||||
|
||||
literal e2_is_emp = mk_eq_empty(e2);
|
||||
switch (ctx.get_assignment(e2_is_emp)) {
|
||||
case l_true:
|
||||
return false; // done
|
||||
case l_undef:
|
||||
ctx.force_phase(~e2_is_emp);
|
||||
return true; // retry
|
||||
default:
|
||||
break;
|
||||
}
|
||||
|
||||
mk_decompose(e2, head2, tail2);
|
||||
conc = mk_concat(head2, tail2);
|
||||
propagate_eq(~e2_is_emp, e2, conc, true);
|
||||
|
||||
literal lit = mk_eq(head1, head2, false);
|
||||
switch (ctx.get_assignment(lit)) {
|
||||
case l_true: {
|
||||
literal_vector lits;
|
||||
lits.push_back(~ctx.get_literal(e));
|
||||
lits.push_back(~e2_is_emp);
|
||||
lits.push_back(lit);
|
||||
propagate_lit(0, lits.size(), lits.c_ptr(), ~mk_literal(m_util.str.mk_prefix(tail1, tail2)));
|
||||
return false;
|
||||
}
|
||||
case l_true:
|
||||
break;
|
||||
case l_false:
|
||||
return false;
|
||||
case l_undef:
|
||||
ctx.force_phase(~lit);
|
||||
return true;
|
||||
}
|
||||
return true;
|
||||
literal_vector lits;
|
||||
lits.push_back(~ctx.get_literal(e));
|
||||
lits.push_back(~e2_is_emp);
|
||||
lits.push_back(lit);
|
||||
propagate_lit(0, lits.size(), lits.c_ptr(), ~mk_literal(m_util.str.mk_prefix(tail1, tail2)));
|
||||
return false;
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
@ -2686,14 +2675,11 @@ bool theory_seq::add_suffix2suffix(expr* e) {
|
|||
return false;
|
||||
}
|
||||
|
||||
expr_ref emp(m_util.str.mk_empty(m.get_sort(e1)), m);
|
||||
literal e2_is_emp = mk_eq_empty(e2);
|
||||
switch (ctx.get_assignment(e2_is_emp)) {
|
||||
case l_true:
|
||||
TRACE("seq", tout << mk_pp(e, m) << " " << mk_pp(e2, m) << " is empty\n";);
|
||||
return false; // done
|
||||
case l_undef:
|
||||
TRACE("seq", tout << mk_pp(e, m) << " " << mk_pp(e2, m) << " is unassigned\n";);
|
||||
ctx.force_phase(e2_is_emp);
|
||||
return true; // retry
|
||||
case l_false:
|
||||
|
|
@ -2701,18 +2687,30 @@ bool theory_seq::add_suffix2suffix(expr* e) {
|
|||
}
|
||||
expr_ref first2 = mk_first(e2);
|
||||
expr_ref last2 = mk_last(e2);
|
||||
expr_ref conc2 = mk_concat(first2, m_util.str.mk_unit(last2));
|
||||
propagate_eq(~e2_is_emp, e2, conc2, true);
|
||||
|
||||
literal e1_is_emp = mk_eq_empty(e1);
|
||||
switch (ctx.get_assignment(e1_is_emp)) {
|
||||
case l_true:
|
||||
return false; // done
|
||||
case l_undef:
|
||||
ctx.force_phase(e1_is_emp);
|
||||
return true; // retry
|
||||
case l_false:
|
||||
break;
|
||||
}
|
||||
expr_ref first1 = mk_first(e1);
|
||||
expr_ref last1 = mk_last(e1);
|
||||
expr_ref conc = mk_concat(first2, m_util.str.mk_unit(last2));
|
||||
propagate_eq(~e2_is_emp, e2, conc, true);
|
||||
expr_ref conc1 = mk_concat(first1, m_util.str.mk_unit(last1));
|
||||
propagate_eq(~e1_is_emp, e1, conc1, true);
|
||||
|
||||
|
||||
literal last_eq = mk_eq(last1, last2, false);
|
||||
switch (ctx.get_assignment(last_eq)) {
|
||||
case l_false:
|
||||
TRACE("seq", tout << mk_pp(e, m) << " " << last1 << " = " << last2 << " is false\n";);
|
||||
return false; // done
|
||||
case l_undef:
|
||||
TRACE("seq", tout << mk_pp(e, m) << " " << last1 << " = " << last2 << " is unassigned\n";);
|
||||
ctx.force_phase(~last_eq);
|
||||
return true;
|
||||
case l_true:
|
||||
|
|
@ -2812,3 +2810,19 @@ bool theory_seq::propagate_automata() {
|
|||
m_atoms.append(re_add);
|
||||
return true;
|
||||
}
|
||||
|
||||
#if 0
|
||||
void theory_seq::get_concat(expr* e, ptr_vector<expr>& concats) {
|
||||
expr* e1, *e2;
|
||||
while (true) {
|
||||
e = m_rep.find(e);
|
||||
if (m_util.str.is_concat(e, e1, e2)) {
|
||||
get_concat(e1, concats);
|
||||
e = e2;
|
||||
continue;
|
||||
}
|
||||
concats.push_back(e);
|
||||
return;
|
||||
}
|
||||
}
|
||||
#endif
|
||||
|
|
|
|||
|
|
@ -369,7 +369,7 @@ namespace smt {
|
|||
// terms whose meaning are encoded using axioms.
|
||||
void enque_axiom(expr* e);
|
||||
void deque_axiom(expr* e);
|
||||
void add_axiom(literal l1, literal l2 = null_literal, literal l3 = null_literal, literal l4 = null_literal);
|
||||
void add_axiom(literal l1, literal l2 = null_literal, literal l3 = null_literal, literal l4 = null_literal, literal l5 = null_literal);
|
||||
void add_indexof_axiom(expr* e);
|
||||
void add_replace_axiom(expr* e);
|
||||
void add_extract_axiom(expr* e);
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue