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Corrected string extraction

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This commit is contained in:
CEisenhofer 2026-06-05 19:57:00 +02:00
parent 8ac7a242eb
commit 67906da97a
4 changed files with 56 additions and 62 deletions
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47
src/smt/seq/seq_nielsen.cpp
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@ -522,8 +522,6 @@ namespace seq {
}
void nielsen_graph::add_str_eq(euf::snode* lhs, euf::snode* rhs, smt::enode* l, smt::enode* r) {
if (!root())
create_root();
const dep_tracker dep = m_dep_mgr.mk_leaf(enode_pair(l, r));
str_eq eq(lhs, rhs, dep);
eq.sort();
@ -537,8 +535,6 @@ namespace seq {
}
void nielsen_graph::add_str_deq(euf::snode* lhs, euf::snode* rhs, smt::enode* l, smt::enode* r) {
if (!root())
create_root();
const dep_tracker dep = m_dep_mgr.mk_leaf(enode_pair(l, r));
str_deq deq(lhs, rhs, dep);
// check if root node contains this equation already
@ -551,8 +547,6 @@ namespace seq {
}
void nielsen_graph::add_str_mem(euf::snode* str, euf::snode* regex, sat::literal l) {
if (!root())
create_root();
// check if root node contains this membership constraint already
if (std::ranges::any_of(m_root->str_mems(), [&](const str_mem& e) {
return e.m_regex == regex && e.m_str == str;
@ -565,8 +559,6 @@ namespace seq {
// test-friendly overloads (no external dependency tracking)
void nielsen_graph::add_str_eq(euf::snode* lhs, euf::snode* rhs) {
if (!root())
create_root();
const dep_tracker dep = m_dep_mgr.mk_leaf(enode_pair(nullptr, nullptr));
str_eq eq(lhs, rhs, dep);
eq.sort();
@ -574,25 +566,23 @@ namespace seq {
}
void nielsen_graph::add_str_deq(euf::snode* lhs, euf::snode* rhs) {
if (!root())
create_root();
const dep_tracker dep = m_dep_mgr.mk_leaf(enode_pair(nullptr, nullptr));
str_deq deq(lhs, rhs, dep);
m_root->add_str_deq(deq);
}
void nielsen_graph::add_str_mem(euf::snode* str, euf::snode* regex) {
if (!root())
create_root();
const dep_tracker dep = nullptr;
m_root->add_str_mem(str_mem(str, regex, dep));
}
void nielsen_graph::reset() {
for (nielsen_node* n : m_nodes)
for (nielsen_node* n : m_nodes) {
dealloc(n);
for (nielsen_edge* e : m_edges)
}
for (nielsen_edge* e : m_edges) {
dealloc(e);
}
m_nodes.reset();
m_edges.reset();
m_root = nullptr;
@ -1863,6 +1853,7 @@ namespace seq {
break;
ptr_vector<nielsen_edge> cur_path;
// scoped_push _scoped_push(m_dep_mgr); // gc dependencies after search
SASSERT(!m_root->is_currently_conflict());
const search_result r = search_dfs(m_root, cur_path); // the main search loop
IF_VERBOSE(1, verbose_stream()
<< " depth_bound=" << m_depth_bound << " dfs_nodes=" << m_stats.m_num_dfs_nodes
@ -2039,12 +2030,15 @@ namespace seq {
display(std::cout, node);
}
VERIFY(ext);
if (node->is_currently_conflict())
// in rare cases, trying to extend can make a complicated conflict visible
return search_result::unsat;
node->set_extended(true);
++m_stats.m_num_extensions;
}
SASSERT(!node->is_currently_conflict());
// explore children
bool any_unknown = false;
bool all_general_conflict = true;
@ -3637,7 +3631,7 @@ namespace seq {
sort* str_sort = nullptr;
if (!seq.is_re(r->get_expr(), str_sort))
return false;
std::cout << "Computing sigma of " << snode_label_html(r, m, false) << std::endl;
// std::cout << "Computing sigma of " << snode_label_html(r, m, false) << std::endl;
if (r->is_empty()) {
const expr_ref eps(seq.re.mk_epsilon(str_sort), m);
@ -3669,15 +3663,12 @@ namespace seq {
result.push_back(sigma_pair(ex, eps, m));
return true;
}
if (c->is_string()) {
const euf::snode * arg = r->arg0();
zstring s;
if (arg->is_string(s, seq) && s.length() > 1) {
for (unsigned i = 0; i <= s.length(); ++i) {
expr_ref p(seq.re.mk_to_re(seq.str.mk_string(s.extract(0, i))), m);
expr_ref q(seq.re.mk_to_re(seq.str.mk_string(s.extract(i, s.length() - i))), m);
result.push_back(sigma_pair(p, q, m));
}
zstring s;
if (c->is_string(s, seq)) {
for (unsigned i = 0; i <= s.length(); ++i) {
expr_ref p(seq.re.mk_to_re(seq.str.mk_string(s.extract(0, i))), m);
expr_ref q(seq.re.mk_to_re(seq.str.mk_string(s.extract(i, s.length() - i))), m);
result.push_back(sigma_pair(p, q, m));
}
return true;
}
@ -3795,8 +3786,8 @@ namespace seq {
}
return true;
}
// the simplifier should have eliminated everything else already
UNREACHABLE();
// the simplifier should have eliminated most of them already
// TODO: so far, we are, however, still missing bounded repetitions and ite
return false;
}