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some adjustments for stack use on large strings

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-01-12 22:08:24 -08:00
parent e8cfbb41d3
commit ab5905cf7f
4 changed files with 47 additions and 25 deletions
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27
src/smt/theory_seq.cpp
View file

@ -4275,13 +4275,17 @@ model_value_proc * theory_seq::mk_value(enode * n, model_generator & mg) {
TRACE("seq", tout << mk_pp(n->get_owner(), m) << "\n";);
e = get_ite_value(e);
if (m_util.is_seq(e)) {
ptr_vector<expr> concats;
get_ite_concat(e, concats);
unsigned start = m_concat.size();
SASSERT(m_todo.empty());
m_todo.push_back(e);
get_ite_concat(m_concat, m_todo);
sort* srt = m.get_sort(e);
seq_value_proc* sv = alloc(seq_value_proc, *this, srt);
unsigned end = m_concat.size();
TRACE("seq", tout << mk_pp(e, m) << "\n";);
for (expr* c : concats) {
for (unsigned i = start; i < end; ++i) {
expr* c = m_concat[i];
expr *c1;
TRACE("seq", tout << mk_pp(c, m) << "\n";);
if (m_util.str.is_unit(c, c1)) {
@ -4301,6 +4305,7 @@ model_value_proc * theory_seq::mk_value(enode * n, model_generator & mg) {
sv->add_string(mk_value(to_app(c)));
}
}
m_concat.shrink(start);
return sv;
}
else {
@ -4308,7 +4313,6 @@ model_value_proc * theory_seq::mk_value(enode * n, model_generator & mg) {
}
}
app* theory_seq::mk_value(app* e) {
expr_ref result(m);
e = get_ite_value(e);
@ -6407,17 +6411,18 @@ bool theory_seq::canonizes(bool sign, expr* e) {
}
void theory_seq::get_ite_concat(expr* e, ptr_vector<expr>& concats) {
void theory_seq::get_ite_concat(ptr_vector<expr>& concats, ptr_vector<expr>& todo) {
expr* e1 = nullptr, *e2 = nullptr;
while (true) {
while (!todo.empty()) {
expr* e = todo.back();
todo.pop_back();
e = m_rep.find(e);
e = get_ite_value(e);
if (m_util.str.is_concat(e, e1, e2)) {
get_ite_concat(e1, concats);
e = e2;
continue;
todo.push_back(e2, e1);
}
concats.push_back(e);
return;
else {
concats.push_back(e);
}
}
}

4
src/smt/theory_seq.h
View file

@ -383,7 +383,7 @@ namespace smt {
symbol m_prefix, m_suffix, m_accept, m_reject;
symbol m_tail, m_seq_first, m_seq_last, m_indexof_left, m_indexof_right, m_aut_step;
symbol m_pre, m_post, m_eq, m_seq_align;
ptr_vector<expr> m_todo;
ptr_vector<expr> m_todo, m_concat;
unsigned m_internalize_depth;
expr_ref_vector m_ls, m_rs, m_lhs, m_rhs;
@ -432,7 +432,7 @@ namespace smt {
void init_model(expr_ref_vector const& es);
app* get_ite_value(expr* a);
void get_ite_concat(expr* e, ptr_vector<expr>& concats);
void get_ite_concat(ptr_vector<expr>& head, ptr_vector<expr>& tail);
void len_offset(expr* e, rational val);
void prop_arith_to_len_offset();