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https://github.com/Z3Prover/z3
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recognize theory_i_arith to fix #1200
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner
parent
347ea50b93
commit
19bb55e396
2 changed files with 76 additions and 31 deletions
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@ -18,6 +18,7 @@ Revision History:
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--*/
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#include <typeinfo>
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#include "smt/proto_model/value_factory.h"
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#include "smt/smt_context.h"
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#include "smt/smt_model_generator.h"
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@ -275,7 +276,22 @@ final_check_status theory_seq::final_check_eh() {
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TRACE("seq", tout << ">>int_string\n";);
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return FC_CONTINUE;
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}
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if (reduce_length_eq() || branch_unit_variable() || branch_binary_variable() || branch_variable_mb() || branch_variable()) {
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if (reduce_length_eq()) {
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++m_stats.m_branch_variable;
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TRACE("seq", tout << ">>reduce length\n";);
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return FC_CONTINUE;
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}
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if (branch_unit_variable()) {
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++m_stats.m_branch_variable;
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TRACE("seq", tout << ">>branch_unit_variable\n";);
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return FC_CONTINUE;
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}
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if (branch_binary_variable() || branch_variable_mb()) {
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++m_stats.m_branch_variable;
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TRACE("seq", tout << ">>branch_variable\n";);
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return FC_CONTINUE;
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}
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if (branch_variable()) {
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++m_stats.m_branch_variable;
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TRACE("seq", tout << ">>branch_variable\n";);
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return FC_CONTINUE;
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@ -318,10 +334,9 @@ bool theory_seq::reduce_length_eq() {
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}
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bool theory_seq::branch_binary_variable() {
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unsigned sz = m_eqs.size();
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for (unsigned i = 0; i < sz; ++i) {
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eq const& e = m_eqs[i];
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for (eq const& e : m_eqs) {
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if (branch_binary_variable(e)) {
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TRACE("seq", display_equation(tout, e););
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return true;
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}
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}
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@ -399,19 +414,21 @@ bool theory_seq::branch_binary_variable(eq const& e) {
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}
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bool theory_seq::branch_unit_variable() {
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unsigned sz = m_eqs.size();
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for (unsigned i = 0; i < sz; ++i) {
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eq const& e = m_eqs[i];
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bool result = false;
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for (eq const& e : m_eqs) {
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if (is_unit_eq(e.ls(), e.rs())) {
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branch_unit_variable(e.dep(), e.ls()[0], e.rs());
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return true;
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result = true;
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break;
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}
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else if (is_unit_eq(e.rs(), e.ls())) {
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branch_unit_variable(e.dep(), e.rs()[0], e.ls());
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return true;
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result = true;
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break;
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}
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}
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return false;
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CTRACE("seq", result, "branch unit variable";);
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return result;
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}
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/**
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@ -434,17 +451,20 @@ void theory_seq::branch_unit_variable(dependency* dep, expr* X, expr_ref_vector
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context& ctx = get_context();
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rational lenX;
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if (!get_length(X, lenX)) {
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TRACE("seq", tout << "enforce length on " << mk_pp(X, m) << "\n";);
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enforce_length(ensure_enode(X));
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return;
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}
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if (lenX > rational(units.size())) {
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expr_ref le(m_autil.mk_le(m_util.str.mk_length(X), m_autil.mk_int(units.size())), m);
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TRACE("seq", tout << "propagate length on " << mk_pp(X, m) << "\n";);
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propagate_lit(dep, 0, 0, mk_literal(le));
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return;
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}
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SASSERT(lenX.is_unsigned());
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unsigned lX = lenX.get_unsigned();
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if (lX == 0) {
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TRACE("seq", tout << "set empty length " << mk_pp(X, m) << "\n";);
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set_empty(X);
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}
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else {
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@ -454,8 +474,10 @@ void theory_seq::branch_unit_variable(dependency* dep, expr* X, expr_ref_vector
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literal_vector lits;
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lits.push_back(lit);
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propagate_eq(dep, lits, X, R, true);
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TRACE("seq", tout << "propagate " << mk_pp(X, m) << " " << R << "\n";);
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}
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else {
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TRACE("seq", tout << "set phase " << mk_pp(X, m) << "\n";);
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ctx.mark_as_relevant(lit);
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ctx.force_phase(lit);
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}
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@ -494,9 +516,11 @@ bool theory_seq::branch_variable_mb() {
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}
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if (split_lengths(e.dep(), e.ls(), e.rs(), len1, len2)) {
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TRACE("seq", tout << "split lengths\n";);
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return true;
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change = true;
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break;
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}
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}
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TRACE("seq", tout << "branch_variable_mb\n";);
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return change;
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}
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@ -651,6 +675,7 @@ bool theory_seq::branch_variable() {
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eq const& e = m_eqs[k];
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if (branch_variable(e)) {
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TRACE("seq", tout << "branch variable\n";);
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return true;
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}
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@ -1577,6 +1602,7 @@ bool theory_seq::reduce_length_eq(expr_ref_vector const& ls, expr_ref_vector con
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len2 += len;
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}
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if (len1 == len2 && 0 < j && j < rs.size() && reduce_length(1, j, true, ls, rs, deps)) {
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TRACE("seq", tout << "l equal\n";);
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return true;
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}
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}
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@ -1586,6 +1612,7 @@ bool theory_seq::reduce_length_eq(expr_ref_vector const& ls, expr_ref_vector con
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len2 += len;
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}
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if (len1 == len2 && 0 < j && j < ls.size() && reduce_length(j, 1, true, ls, rs, deps)) {
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TRACE("seq", tout << "r equal\n";);
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return true;
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}
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}
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@ -1595,6 +1622,7 @@ bool theory_seq::reduce_length_eq(expr_ref_vector const& ls, expr_ref_vector con
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len2 += len;
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}
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if (len1 == len2 && 0 < j && j < rs.size() && reduce_length(ls.size()-1, rs.size()-j, false, ls, rs, deps)) {
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TRACE("seq", tout << "l suffix equal\n";);
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return true;
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}
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}
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@ -1604,6 +1632,7 @@ bool theory_seq::reduce_length_eq(expr_ref_vector const& ls, expr_ref_vector con
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len2 += len;
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}
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if (len1 == len2 && 0 < j && j < ls.size() && reduce_length(ls.size()-j, rs.size()-1, false, ls, rs, deps)) {
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TRACE("seq", tout << "r suffix equal\n";);
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return true;
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}
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}
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@ -1641,6 +1670,7 @@ bool theory_seq::reduce_length(unsigned i, unsigned j, bool front, expr_ref_vect
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deps = mk_join(deps, lit);
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m_eqs.push_back(eq(m_eq_id++, lhs, rhs, deps));
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propagate_eq(deps, lits, l, r, true);
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TRACE("seq", tout << "propagate eq\nlhs: " << lhs << "\nrhs: " << rhs << "\n";);
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return true;
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}
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else {
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@ -2510,8 +2540,8 @@ void theory_seq::display_nc(std::ostream& out, nc const& nc) const {
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}
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void theory_seq::display_equations(std::ostream& out) const {
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for (unsigned i = 0; i < m_eqs.size(); ++i) {
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display_equation(out, m_eqs[i]);
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for (eq const& e : m_eqs) {
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display_equation(out, e);
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}
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}
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@ -2522,10 +2552,10 @@ void theory_seq::display_equation(std::ostream& out, eq const& e) const {
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void theory_seq::display_disequations(std::ostream& out) const {
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bool first = true;
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for (unsigned i = 0; i < m_nqs.size(); ++i) {
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for (ne const& n : m_nqs) {
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if (first) out << "Disequations:\n";
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first = false;
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display_disequation(out, m_nqs[i]);
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display_disequation(out, n);
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}
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}
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@ -3406,24 +3436,32 @@ enode* theory_seq::ensure_enode(expr* e) {
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return n;
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}
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static theory_mi_arith* get_th_arith(context& ctx, theory_id afid, expr* e) {
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template <class T>
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static T* get_th_arith(context& ctx, theory_id afid, expr* e) {
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theory* th = ctx.get_theory(afid);
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if (th && ctx.e_internalized(e)) {
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return dynamic_cast<theory_mi_arith*>(th);
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return dynamic_cast<T*>(th);
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}
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else {
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return 0;
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}
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}
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static bool get_arith_value(context& ctx, theory_id afid, expr* e, expr_ref& v) {
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theory_mi_arith* tha = get_th_arith<theory_mi_arith>(ctx, afid, e);
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if (tha) return tha->get_value(ctx.get_enode(e), v);
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theory_i_arith* thi = get_th_arith<theory_i_arith>(ctx, afid, e);
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if (thi) return thi->get_value(ctx.get_enode(e), v);
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TRACE("seq", tout << "no arithmetic theory\n";);
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return false;
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}
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bool theory_seq::get_num_value(expr* e, rational& val) const {
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context& ctx = get_context();
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theory_mi_arith* tha = get_th_arith(ctx, m_autil.get_family_id(), e);
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expr_ref _val(m);
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if (!tha) return false;
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enode* next = ctx.get_enode(e), *n = next;
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do {
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if (tha->get_value(next, _val) && m_autil.is_numeral(_val, val) && val.is_int()) {
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if (get_arith_value(ctx, m_autil.get_family_id(), next->get_owner(), _val) && m_autil.is_numeral(_val, val) && val.is_int()) {
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return true;
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}
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next = next->get_next();
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@ -3435,27 +3473,31 @@ bool theory_seq::get_num_value(expr* e, rational& val) const {
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bool theory_seq::lower_bound(expr* _e, rational& lo) const {
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context& ctx = get_context();
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expr_ref e(m_util.str.mk_length(_e), m);
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theory_mi_arith* tha = get_th_arith(ctx, m_autil.get_family_id(), e);
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expr_ref _lo(m);
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if (!tha || !tha->get_lower(ctx.get_enode(e), _lo)) return false;
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theory_mi_arith* tha = get_th_arith<theory_mi_arith>(ctx, m_autil.get_family_id(), e);
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if (tha && !tha->get_lower(ctx.get_enode(e), _lo)) return false;
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if (!tha) {
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theory_i_arith* thi = get_th_arith<theory_i_arith>(ctx, m_autil.get_family_id(), e);
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if (!thi || !thi->get_lower(ctx.get_enode(e), _lo)) return false;
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}
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return m_autil.is_numeral(_lo, lo) && lo.is_int();
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}
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bool theory_seq::upper_bound(expr* _e, rational& hi) const {
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context& ctx = get_context();
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expr_ref e(m_util.str.mk_length(_e), m);
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theory_mi_arith* tha = get_th_arith(ctx, m_autil.get_family_id(), e);
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theory_mi_arith* tha = get_th_arith<theory_mi_arith>(ctx, m_autil.get_family_id(), e);
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expr_ref _hi(m);
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if (!tha || !tha->get_upper(ctx.get_enode(e), _hi)) return false;
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if (tha && !tha->get_upper(ctx.get_enode(e), _hi)) return false;
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if (!tha) {
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theory_i_arith* thi = get_th_arith<theory_i_arith>(ctx, m_autil.get_family_id(), e);
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if (!thi || !thi->get_upper(ctx.get_enode(e), _hi)) return false;
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}
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return m_autil.is_numeral(_hi, hi) && hi.is_int();
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}
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bool theory_seq::get_length(expr* e, rational& val) const {
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context& ctx = get_context();
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theory* th = ctx.get_theory(m_autil.get_family_id());
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if (!th) return false;
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theory_mi_arith* tha = dynamic_cast<theory_mi_arith*>(th);
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if (!tha) return false;
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rational val1;
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expr_ref len(m), len_val(m);
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expr* e1 = 0, *e2 = 0;
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@ -3480,20 +3522,23 @@ bool theory_seq::get_length(expr* e, rational& val) const {
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val += rational(s.length());
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}
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else if (!has_length(c)) {
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TRACE("seq", tout << "literal has no length " << mk_pp(c, m) << "\n";);
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return false;
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}
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else {
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len = m_util.str.mk_length(c);
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if (ctx.e_internalized(len) &&
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tha->get_value(ctx.get_enode(len), len_val) &&
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get_arith_value(ctx, m_autil.get_family_id(), len, len_val) &&
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m_autil.is_numeral(len_val, val1)) {
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val += val1;
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}
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else {
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TRACE("seq", tout << "length has not been internalized " << mk_pp(c, m) << "\n";);
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return false;
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}
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}
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}
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CTRACE("seq", !val.is_int(), "length is not an integer\n";);
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return val.is_int();
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}
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@ -113,8 +113,8 @@ public:
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}
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};
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iterator begin() { return iterator(*this, 0); }
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iterator end() { return iterator(*this, m_size); }
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iterator begin() const { return iterator(*this, 0); }
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iterator end() const { return iterator(*this, m_size); }
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void push_back(T const& t) {
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set_index(m_size, m_elems.size());
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