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fix #2415

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2019-07-20 16:23:01 -07:00
parent 43a19cadf6
commit e593b5b2c8
3 changed files with 12 additions and 9 deletions
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16
src/ast/rewriter/seq_rewriter.cpp
View file

@ -699,9 +699,11 @@ br_status seq_rewriter::mk_seq_extract(expr* a, expr* b, expr* c, expr_ref& resu
if (lengthPos) {
m_lhs.reset();
expr_ref_vector lens(m()), other(m());
expr_ref_vector lens(m());
m_util.str.get_concat(a, m_lhs);
get_lengths(b, lens, other, pos);
if (!get_lengths(b, lens, pos)) {
return BR_FAILED;
}
unsigned rsz = lens.size();
unsigned i = 0;
for (; i < m_lhs.size(); ++i) {
@ -728,9 +730,6 @@ br_status seq_rewriter::mk_seq_extract(expr* a, expr* b, expr* c, expr_ref& resu
for (expr* rhs : lens) {
t2 = m_autil.mk_add(t2, m_util.str.mk_length(rhs));
}
for (expr* rhs : other) {
t2 = m_autil.mk_add(t2, rhs);
}
result = m_util.str.mk_substr(t1, t2, c);
return BR_REWRITE2;
}
@ -782,12 +781,12 @@ br_status seq_rewriter::mk_seq_extract(expr* a, expr* b, expr* c, expr_ref& resu
return BR_REWRITE3;
}
void seq_rewriter::get_lengths(expr* e, expr_ref_vector& lens, expr_ref_vector& other, rational& pos) {
bool seq_rewriter::get_lengths(expr* e, expr_ref_vector& lens, rational& pos) {
expr* arg = nullptr;
rational pos1;
if (m_autil.is_add(e)) {
for (expr* arg1 : *to_app(e)) {
get_lengths(arg1, lens, other, pos);
if (!get_lengths(arg1, lens, pos)) return false;
}
}
else if (m_util.str.is_length(e, arg)) {
@ -797,8 +796,9 @@ void seq_rewriter::get_lengths(expr* e, expr_ref_vector& lens, expr_ref_vector&
pos += pos1;
}
else {
other.push_back(e);
return false;
}
return true;
}
bool seq_rewriter::cannot_contain_suffix(expr* a, expr* b) {

2
src/ast/rewriter/seq_rewriter.h
View file

@ -155,7 +155,7 @@ class seq_rewriter {
bool is_sequence(eautomaton& aut, expr_ref_vector& seq);
bool is_epsilon(expr* e) const;
void split_units(expr_ref_vector& lhs, expr_ref_vector& rhs);
void get_lengths(expr* e, expr_ref_vector& lens, expr_ref_vector& other, rational& pos);
bool get_lengths(expr* e, expr_ref_vector& lens, rational& pos);
public:

3
src/smt/theory_seq.cpp
View file

@ -4746,6 +4746,9 @@ void theory_seq::add_itos_length_axiom(expr* len) {
literal n_ge_100hi = mk_literal(m_autil.mk_ge(n, m_autil.mk_numeral(ten*ten*hi, true)));
add_axiom(~n_ge_10hi, len_ge);
add_axiom(n_ge_10hi, ~len_ge);
add_axiom(n_ge_100hi, len_le);
add_axiom(~n_ge_100hi, ~len_le);
}