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https://github.com/Z3Prover/z3
synced 2025-04-08 10:25:18 +00:00
parent
43a19cadf6
commit
e593b5b2c8
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@ -699,9 +699,11 @@ br_status seq_rewriter::mk_seq_extract(expr* a, expr* b, expr* c, expr_ref& resu
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if (lengthPos) {
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m_lhs.reset();
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expr_ref_vector lens(m()), other(m());
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expr_ref_vector lens(m());
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m_util.str.get_concat(a, m_lhs);
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get_lengths(b, lens, other, pos);
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if (!get_lengths(b, lens, pos)) {
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return BR_FAILED;
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}
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unsigned rsz = lens.size();
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unsigned i = 0;
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for (; i < m_lhs.size(); ++i) {
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@ -728,9 +730,6 @@ br_status seq_rewriter::mk_seq_extract(expr* a, expr* b, expr* c, expr_ref& resu
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for (expr* rhs : lens) {
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t2 = m_autil.mk_add(t2, m_util.str.mk_length(rhs));
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}
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for (expr* rhs : other) {
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t2 = m_autil.mk_add(t2, rhs);
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}
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result = m_util.str.mk_substr(t1, t2, c);
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return BR_REWRITE2;
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}
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@ -782,12 +781,12 @@ br_status seq_rewriter::mk_seq_extract(expr* a, expr* b, expr* c, expr_ref& resu
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return BR_REWRITE3;
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}
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void seq_rewriter::get_lengths(expr* e, expr_ref_vector& lens, expr_ref_vector& other, rational& pos) {
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bool seq_rewriter::get_lengths(expr* e, expr_ref_vector& lens, rational& pos) {
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expr* arg = nullptr;
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rational pos1;
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if (m_autil.is_add(e)) {
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for (expr* arg1 : *to_app(e)) {
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get_lengths(arg1, lens, other, pos);
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if (!get_lengths(arg1, lens, pos)) return false;
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}
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}
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else if (m_util.str.is_length(e, arg)) {
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@ -797,8 +796,9 @@ void seq_rewriter::get_lengths(expr* e, expr_ref_vector& lens, expr_ref_vector&
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pos += pos1;
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}
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else {
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other.push_back(e);
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return false;
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}
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return true;
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}
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bool seq_rewriter::cannot_contain_suffix(expr* a, expr* b) {
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@ -155,7 +155,7 @@ class seq_rewriter {
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bool is_sequence(eautomaton& aut, expr_ref_vector& seq);
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bool is_epsilon(expr* e) const;
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void split_units(expr_ref_vector& lhs, expr_ref_vector& rhs);
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void get_lengths(expr* e, expr_ref_vector& lens, expr_ref_vector& other, rational& pos);
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bool get_lengths(expr* e, expr_ref_vector& lens, rational& pos);
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public:
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@ -4746,6 +4746,9 @@ void theory_seq::add_itos_length_axiom(expr* len) {
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literal n_ge_100hi = mk_literal(m_autil.mk_ge(n, m_autil.mk_numeral(ten*ten*hi, true)));
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add_axiom(~n_ge_10hi, len_ge);
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add_axiom(n_ge_10hi, ~len_ge);
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add_axiom(n_ge_100hi, len_le);
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add_axiom(~n_ge_100hi, ~len_le);
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}
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