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https://github.com/Z3Prover/z3
synced 2025-04-27 10:55:50 +00:00
na
This commit is contained in:
Nikolaj Bjorner
parent
8de96009cd
commit
7edc99f807
1 changed files with 128 additions and 118 deletions
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@ -126,6 +126,8 @@ expr* theory_seq::expr2rep(expr* e) {
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}
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#if 0
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/**
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\brief
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@ -158,7 +160,6 @@ expr* theory_seq::expr2rep(expr* e) {
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TODO: propagate length offsets for last vars
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*/
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#if 0
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bool theory_seq::find_better_rep(expr_ref_vector const& ls, expr_ref_vector const& rs, unsigned idx,
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dependency*& deps, expr_ref_vector & res) {
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@ -235,6 +236,32 @@ bool theory_seq::find_better_rep(expr_ref_vector const& ls, expr_ref_vector cons
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}
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return false;
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}
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int theory_seq::find_fst_non_empty_idx(expr_ref_vector const& xs) {
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for (unsigned i = 0; i < xs.size(); ++i) {
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expr* x = xs[i];
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if (!is_var(x))
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return -1;
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expr_ref e = mk_len(x);
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if (ctx.e_internalized(e)) {
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enode* root = ctx.get_enode(e)->get_root();
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rational val;
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if (m_autil.is_numeral(root->get_expr(), val) && val.is_zero()) {
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continue;
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}
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}
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return i;
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}
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return -1;
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}
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expr* theory_seq::find_fst_non_empty_var(expr_ref_vector const& x) {
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int i = find_fst_non_empty_idx(x);
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if (i >= 0)
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return x[i];
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return nullptr;
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}
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#endif
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bool theory_seq::has_len_offset(expr_ref_vector const& ls, expr_ref_vector const& rs, int & offset) {
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@ -399,20 +426,17 @@ bool theory_seq::branch_variable_mb() {
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rational l1, l2;
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for (const auto& elem : len1) l1 += elem;
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for (const auto& elem : len2) l2 += elem;
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if (l1 != l2) {
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expr_ref l = mk_concat(e.ls);
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expr_ref r = mk_concat(e.rs);
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expr_ref lnl = mk_len(l), lnr = mk_len(r);
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if (propagate_eq(e.dep(), lnl, lnr, false)) {
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change = true;
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}
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continue;
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}
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if (split_lengths(e.dep(), e.ls, e.rs, len1, len2)) {
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if (l1 == l2 && split_lengths(e.dep(), e.ls, e.rs, len1, len2)) {
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TRACE("seq", tout << "split lengths\n";);
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change = true;
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break;
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}
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expr_ref l = mk_concat(e.ls);
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expr_ref r = mk_concat(e.rs);
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expr_ref lnl = mk_len(l), lnr = mk_len(r);
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if (propagate_eq(e.dep(), lnl, lnr, false))
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change = true;
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}
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return change;
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}
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@ -601,6 +625,14 @@ bool theory_seq::branch_binary_variable(depeq const& e) {
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bool theory_seq::branch_unit_variable() {
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bool result = false;
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for (auto const& e : m_eqs) {
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#if 0
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eqr er(e.ls, e.rs);
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m_eq_deps = e.deps;
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if (m_eq.branch(0, er)) {
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result = true;
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break;
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}
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#else
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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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result = true;
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@ -611,6 +643,7 @@ bool theory_seq::branch_unit_variable() {
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result = true;
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break;
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}
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#endif
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}
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CTRACE("seq", result, tout << "branch unit variable\n";);
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return result;
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@ -842,121 +875,98 @@ bool theory_seq::branch_quat_variable(depeq const& e) {
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else if (!can_align_from_lhs(xs, ys) && !can_align_from_rhs(xs, ys))
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cond = true;
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if (cond) {
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literal_vector lits;
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if (xs == ys) {
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literal lit = mk_eq(mk_len(x1), mk_len(y1), false);
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if (ctx.get_assignment(lit) == l_undef) {
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TRACE("seq", tout << mk_pp(x1, m) << " = " << mk_pp(y1, m) << "?\n";);
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ctx.mark_as_relevant(lit);
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return true;
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}
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else if (ctx.get_assignment(lit) == l_true) {
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TRACE("seq", tout << mk_pp(x1, m) << " = " << mk_pp(y1, m) << "\n";);
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propagate_eq(dep, lit, x1, y1, true);
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propagate_eq(dep, lit, x2, y2, true);
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return true;
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}
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TRACE("seq", tout << mk_pp(x1, m) << " != " << mk_pp(y1, m) << "\n";);
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lits.push_back(~lit);
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}
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literal lit1 = mk_alignment(x1, y1);
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literal lit2 = m_ax.mk_ge(mk_sub(mk_len(y1), mk_len(x1)), xs.size());
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literal lit3 = m_ax.mk_ge(mk_sub(mk_len(x1), mk_len(y1)), ys.size());
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if (ctx.get_assignment(lit1) == l_undef) {
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TRACE("seq", tout << mk_pp(x1, m) << " <= " << mk_pp(y1, m) << "?\n";);
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ctx.mark_as_relevant(lit1);
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if (!cond)
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return false;
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literal_vector lits;
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if (xs == ys) {
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literal lit = mk_eq(mk_len(x1), mk_len(y1), false);
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if (ctx.get_assignment(lit) == l_undef) {
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TRACE("seq", tout << mk_pp(x1, m) << " = " << mk_pp(y1, m) << "?\n";);
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ctx.mark_as_relevant(lit);
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return true;
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}
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if (ctx.get_assignment(lit1) == l_true) {
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TRACE("seq", tout << mk_pp(x1, m) << " <= " << mk_pp(y1, m) << "\n";);
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if (ctx.get_assignment(lit2) == l_undef) {
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ctx.mark_as_relevant(lit2);
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return true;
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}
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}
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else {
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TRACE("seq", tout << mk_pp(x1, m) << " > " << mk_pp(y1, m) << "\n";);
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if (ctx.get_assignment(lit3) == l_undef) {
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ctx.mark_as_relevant(lit3);
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return true;
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}
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}
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expr_ref xsE = mk_concat(xs);
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expr_ref ysE = mk_concat(ys);
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expr_ref x1xs = mk_concat(x1, xsE);
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expr_ref y1ys = mk_concat(y1, ysE);
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expr_ref xsx2 = mk_concat(xsE, x2);
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expr_ref ysy2 = mk_concat(ysE, y2);
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if (ctx.get_assignment(lit1) == l_true && ctx.get_assignment(lit2) == l_true) {
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// |x1++xs| <= |y1| => x1 ++ xs ++ z2 = y1, x2 = z2 ++ ys ++ y2
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expr_ref Z2 = m_sk.mk_align_m(y1, x1, xsE, x2);
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expr_ref x1xsZ2 = mk_concat(x1xs, Z2);
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expr_ref Z2ysy2 = mk_concat(Z2, ysy2);
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propagate_eq(dep, lit2, x1xsZ2, y1, true);
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propagate_eq(dep, lit2, x2, Z2ysy2, true);
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else if (ctx.get_assignment(lit) == l_true) {
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TRACE("seq", tout << mk_pp(x1, m) << " = " << mk_pp(y1, m) << "\n";);
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propagate_eq(dep, lit, x1, y1, true);
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propagate_eq(dep, lit, x2, y2, true);
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return true;
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}
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if (ctx.get_assignment(lit1) == l_false && ctx.get_assignment(lit3) == l_true) {
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// |x1| >= |y1++ys| => x1 = y1 ++ ys ++ z1, z1 ++ xs ++ x2 = y2
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expr_ref Z1 = m_sk.mk_align_m(x1, y1, ysE, y2);
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expr_ref y1ysZ1 = mk_concat(y1ys, Z1);
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expr_ref Z1xsx2 = mk_concat(Z1, xsx2);
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propagate_eq(dep, lit3, x1, y1ysZ1, true);
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propagate_eq(dep, lit3, Z1xsx2, y2, true);
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return true;
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}
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// Infeasible cases because xs and ys cannot align
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if (ctx.get_assignment(lit1) == l_false && ctx.get_assignment(lit2) == l_true) {
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lits.push_back(~lit1);
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lits.push_back(lit2);
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return propagate_lit(nullptr, lits.size(), lits.c_ptr(), false_literal);
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}
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if (ctx.get_assignment(lit1) == l_true && ctx.get_assignment(lit3) == l_true) {
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lits.push_back(lit1);
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lits.push_back(lit3);
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return propagate_lit(nullptr, lits.size(), lits.c_ptr(), false_literal);
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}
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if (ctx.get_assignment(lit1) == l_true && ctx.get_assignment(lit2) == l_false) {
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lits.push_back(lit1);
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lits.push_back(~lit2);
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return propagate_lit(dep, lits.size(), lits.c_ptr(), false_literal);
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}
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if (ctx.get_assignment(lit1) == l_false && ctx.get_assignment(lit3) == l_false) {
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lits.push_back(~lit1);
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lits.push_back(~lit3);
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return propagate_lit(dep, lits.size(), lits.c_ptr(), false_literal);
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}
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UNREACHABLE();
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TRACE("seq", tout << mk_pp(x1, m) << " != " << mk_pp(y1, m) << "\n";);
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lits.push_back(~lit);
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}
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return false;
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}
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int theory_seq::find_fst_non_empty_idx(expr_ref_vector const& xs) {
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for (unsigned i = 0; i < xs.size(); ++i) {
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expr* x = xs[i];
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if (!is_var(x)) return -1;
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expr_ref e = mk_len(x);
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if (ctx.e_internalized(e)) {
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enode* root = ctx.get_enode(e)->get_root();
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rational val;
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if (m_autil.is_numeral(root->get_expr(), val) && val.is_zero()) {
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continue;
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}
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}
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return i;
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literal lit1 = mk_alignment(x1, y1);
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literal lit2 = m_ax.mk_ge(mk_sub(mk_len(y1), mk_len(x1)), xs.size());
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literal lit3 = m_ax.mk_ge(mk_sub(mk_len(x1), mk_len(y1)), ys.size());
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if (ctx.get_assignment(lit1) == l_undef) {
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TRACE("seq", tout << mk_pp(x1, m) << " <= " << mk_pp(y1, m) << "?\n";);
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ctx.mark_as_relevant(lit1);
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return true;
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}
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return -1;
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if (ctx.get_assignment(lit1) == l_true) {
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TRACE("seq", tout << mk_pp(x1, m) << " <= " << mk_pp(y1, m) << "\n";);
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if (ctx.get_assignment(lit2) == l_undef) {
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ctx.mark_as_relevant(lit2);
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return true;
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}
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}
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else {
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TRACE("seq", tout << mk_pp(x1, m) << " > " << mk_pp(y1, m) << "\n";);
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if (ctx.get_assignment(lit3) == l_undef) {
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ctx.mark_as_relevant(lit3);
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return true;
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}
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}
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expr_ref xsE = mk_concat(xs);
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expr_ref ysE = mk_concat(ys);
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expr_ref x1xs = mk_concat(x1, xsE);
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expr_ref y1ys = mk_concat(y1, ysE);
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expr_ref xsx2 = mk_concat(xsE, x2);
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expr_ref ysy2 = mk_concat(ysE, y2);
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if (ctx.get_assignment(lit1) == l_true && ctx.get_assignment(lit2) == l_true) {
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// |x1++xs| <= |y1| => x1 ++ xs ++ z2 = y1, x2 = z2 ++ ys ++ y2
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expr_ref Z2 = m_sk.mk_align_m(y1, x1, xsE, x2);
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expr_ref x1xsZ2 = mk_concat(x1xs, Z2);
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expr_ref Z2ysy2 = mk_concat(Z2, ysy2);
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propagate_eq(dep, lit2, x1xsZ2, y1, true);
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propagate_eq(dep, lit2, x2, Z2ysy2, true);
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return true;
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}
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if (ctx.get_assignment(lit1) == l_false && ctx.get_assignment(lit3) == l_true) {
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// |x1| >= |y1++ys| => x1 = y1 ++ ys ++ z1, z1 ++ xs ++ x2 = y2
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expr_ref Z1 = m_sk.mk_align_m(x1, y1, ysE, y2);
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expr_ref y1ysZ1 = mk_concat(y1ys, Z1);
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expr_ref Z1xsx2 = mk_concat(Z1, xsx2);
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propagate_eq(dep, lit3, x1, y1ysZ1, true);
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propagate_eq(dep, lit3, Z1xsx2, y2, true);
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return true;
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}
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// Infeasible cases because xs and ys cannot align
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if (ctx.get_assignment(lit1) == l_false && ctx.get_assignment(lit2) == l_true) {
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lits.push_back(~lit1);
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lits.push_back(lit2);
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return propagate_lit(nullptr, lits.size(), lits.c_ptr(), false_literal);
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}
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if (ctx.get_assignment(lit1) == l_true && ctx.get_assignment(lit3) == l_true) {
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lits.push_back(lit1);
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lits.push_back(lit3);
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return propagate_lit(nullptr, lits.size(), lits.c_ptr(), false_literal);
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}
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if (ctx.get_assignment(lit1) == l_true && ctx.get_assignment(lit2) == l_false) {
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lits.push_back(lit1);
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lits.push_back(~lit2);
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return propagate_lit(dep, lits.size(), lits.c_ptr(), false_literal);
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}
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if (ctx.get_assignment(lit1) == l_false && ctx.get_assignment(lit3) == l_false) {
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lits.push_back(~lit1);
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lits.push_back(~lit3);
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return propagate_lit(dep, lits.size(), lits.c_ptr(), false_literal);
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}
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UNREACHABLE();
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}
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expr* theory_seq::find_fst_non_empty_var(expr_ref_vector const& x) {
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int i = find_fst_non_empty_idx(x);
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if (i >= 0)
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return x[i];
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return nullptr;
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}
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bool theory_seq::branch_variable_eq() {
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unsigned sz = m_eqs.size();
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