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Refactor: replace int_constraint with constraint struct, promote cur_path to member, expose path leaf side constraints (#9124)
* chore: update plan with cur_path and side constraints requirements Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com> Agent-Logs-Url: https://github.com/Z3Prover/z3/sessions/1523cf0a-b7a4-41a6-b792-7cd41b4dcd3b * Refactor: rename int_constraint to constraint, remove int_constraint_kind enum - Rename int_constraint struct to constraint with fields fml/dep - Remove int_constraint_kind enum; pre-build formula expressions instead - nielsen_edge: add_side_int/side_int() -> add_side_constraint/side_constraints() - nielsen_node: add_int_constraint/int_constraints() -> add_constraint/constraints() - nielsen_graph: mk_int_constraint(lhs,rhs,kind,dep) -> mk_constraint(fml,dep) - Remove int_constraint_to_expr (no longer needed) - search_dfs/simplify_and_init/check_int_feasibility/check_lp_le: drop cur_path param - Add m_cur_path member to nielsen_graph; m_cur_path.reset() in solve() - Add get_path_leaf_side_constraints() implementation - Update seq_parikh.h/cpp and seq_nielsen_pp.cpp to use new constraint API Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * refactor: constraint struct, promote cur_path, expose path leaf side constraints Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com> Agent-Logs-Url: https://github.com/Z3Prover/z3/sessions/1523cf0a-b7a4-41a6-b792-7cd41b4dcd3b * fix: remove spurious includes from seq_nielsen.cpp Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com> Agent-Logs-Url: https://github.com/Z3Prover/z3/sessions/aa283d79-cd42-4b87-aaf0-4273a8327b76 * fix: update test files to use renamed constraint API and fix inverted root guard Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com> Agent-Logs-Url: https://github.com/Z3Prover/z3/sessions/b09bbc56-9617-4277-8e0c-27fa7e588037 --------- Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com> Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Co-authored-by: Nikolaj Bjorner <nbjorner@microsoft.com>
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7 changed files with 183 additions and 231 deletions
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@ -326,7 +326,7 @@ static void test_generate_constraints_ab_star() {
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seq::dep_tracker dep = dm.mk_leaf(lit);
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seq::str_mem mem(x, regex, nullptr, 0, dep);
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vector<seq::int_constraint> out;
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vector<seq::constraint> out;
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parikh.generate_parikh_constraints(mem, out);
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// expect at least: len(x)=0+2k and k>=0
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@ -337,19 +337,19 @@ static void test_generate_constraints_ab_star() {
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// check that one constraint is an equality (len(x) = 0 + 2·k)
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bool has_eq = false;
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for (auto const& ic : out)
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if (ic.m_kind == seq::int_constraint_kind::eq) has_eq = true;
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if (m.is_eq(ic.fml)) has_eq = true;
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SASSERT(has_eq);
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// check that one constraint is k >= 0
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bool has_ge = false;
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for (auto const& ic : out)
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if (ic.m_kind == seq::int_constraint_kind::ge) has_ge = true;
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if (arith.is_ge(ic.fml)) has_ge = true;
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SASSERT(has_ge);
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// should NOT have an upper bound (star is unbounded)
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bool has_le = false;
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for (auto const& ic : out)
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if (ic.m_kind == seq::int_constraint_kind::le) has_le = true;
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if (arith.is_le(ic.fml)) has_le = true;
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SASSERT(!has_le);
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}
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@ -361,6 +361,7 @@ static void test_generate_constraints_bounded_loop() {
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euf::egraph eg(m);
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euf::sgraph sg(m, eg);
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seq_util seq(m);
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arith_util arith(m);
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seq::seq_parikh parikh(sg);
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euf::snode* x = sg.mk_var(symbol("x"), sg.get_str_sort());
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@ -372,7 +373,7 @@ static void test_generate_constraints_bounded_loop() {
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seq::dep_tracker dep = dm.mk_leaf(sat::null_literal);
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seq::str_mem mem(x, regex, nullptr, 0, dep);
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vector<seq::int_constraint> out;
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vector<seq::constraint> out;
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parikh.generate_parikh_constraints(mem, out);
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// expect: eq + ge + le = 3 constraints
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@ -381,9 +382,9 @@ static void test_generate_constraints_bounded_loop() {
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bool has_eq = false, has_ge = false, has_le = false;
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for (auto const& ic : out) {
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if (ic.m_kind == seq::int_constraint_kind::eq) has_eq = true;
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if (ic.m_kind == seq::int_constraint_kind::ge) has_ge = true;
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if (ic.m_kind == seq::int_constraint_kind::le) has_le = true;
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if (m.is_eq(ic.fml)) has_eq = true;
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if (arith.is_ge(ic.fml)) has_ge = true;
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if (arith.is_le(ic.fml)) has_le = true;
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}
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SASSERT(has_eq);
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SASSERT(has_ge);
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@ -409,7 +410,7 @@ static void test_generate_constraints_stride_one() {
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seq::dep_tracker dep = dm.mk_leaf(sat::null_literal);
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seq::str_mem mem(x, regex, nullptr, 0, dep);
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vector<seq::int_constraint> out;
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vector<seq::constraint> out;
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parikh.generate_parikh_constraints(mem, out);
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std::cout << " generated " << out.size() << " constraints (expect 0)\n";
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SASSERT(out.empty());
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@ -432,7 +433,7 @@ static void test_generate_constraints_fixed_length() {
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seq::dep_tracker dep = dm.mk_leaf(sat::null_literal);
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seq::str_mem mem(x, regex, nullptr, 0, dep);
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vector<seq::int_constraint> out;
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vector<seq::constraint> out;
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parikh.generate_parikh_constraints(mem, out);
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std::cout << " generated " << out.size() << " constraints (expect 0)\n";
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SASSERT(out.empty());
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@ -456,14 +457,14 @@ static void test_generate_constraints_dep_propagated() {
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seq::dep_tracker dep = dm.mk_leaf(lit);
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seq::str_mem mem(x, regex, nullptr, 0, dep);
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vector<seq::int_constraint> out;
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vector<seq::constraint> out;
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parikh.generate_parikh_constraints(mem, out);
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// all generated constraints must carry dep_source{mem,7} in their dependency
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for (auto const& ic : out) {
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SASSERT(ic.m_dep != nullptr);
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SASSERT(ic.dep != nullptr);
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vector<seq::dep_source, false> vs;
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dm.linearize(ic.m_dep, vs);
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dm.linearize(ic.dep, vs);
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bool found = false;
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for (auto const& d : vs)
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if (std::get<sat::literal>(d) == lit) found = true;
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@ -495,11 +496,11 @@ static void test_apply_to_node_adds_constraints() {
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// root node should have no int_constraints initially
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SASSERT(ng.root() != nullptr);
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unsigned before = ng.root()->int_constraints().size();
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unsigned before = ng.root()->constraints().size();
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parikh.apply_to_node(*ng.root());
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unsigned after = ng.root()->int_constraints().size();
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unsigned after = ng.root()->constraints().size();
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std::cout << " before=" << before << " after=" << after << "\n";
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SASSERT(after > before);
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}
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@ -525,9 +526,9 @@ static void test_apply_to_node_stride_one_no_constraints() {
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euf::snode* regex = sg.mk(re);
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ng.add_str_mem(x, regex);
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unsigned before = ng.root()->int_constraints().size();
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unsigned before = ng.root()->constraints().size();
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parikh.apply_to_node(*ng.root());
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unsigned after = ng.root()->int_constraints().size();
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unsigned after = ng.root()->constraints().size();
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std::cout << " before=" << before << " after=" << after << " (expect no change)\n";
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SASSERT(after == before);
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}
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