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The side-condition of the "if"-split belongs on the edges

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CEisenhofer 2026-05-12 10:30:29 +02:00
parent bb639af485
commit c9fb432191
5 changed files with 44 additions and 22 deletions
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20
src/smt/seq/seq_nielsen.cpp
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@ -1443,7 +1443,7 @@ namespace seq {
euf::snode* deriv = fwd
? sg.brzozowski_deriv(mem.m_regex, tok)
: reverse_brzozowski_deriv(sg, mem.m_regex, tok);
TRACE(seq, tout << mem_pp(m, mem) << " d: " << spp(deriv, m) << "\n");
TRACE(seq, tout << mem_pp(mem, m) << " d: " << spp(deriv, m) << "\n");
if (!deriv)
break;
if (deriv->is_fail()) {
@ -1529,7 +1529,7 @@ namespace seq {
// check for regex memberships that are immediately infeasible
for (str_mem& mem : m_str_mem) {
if (mem.is_contradiction(this)) {
TRACE(seq, tout << "contradiction " << mem_pp(m, mem) << "\n");
TRACE(seq, tout << "contradiction " << mem_pp(mem, m) << "\n");
set_general_conflict();
set_conflict(backtrack_reason::regex, mem.m_dep);
return simplify_result::conflict;
@ -3521,7 +3521,7 @@ namespace seq {
for (str_mem const& mem : node->str_mems()) {
SASSERT(mem.well_formed());
if (mem.is_primitive() || !mem.m_regex->is_classical())
if (mem.m_str->is_empty() || mem.is_primitive() || !mem.m_regex->is_classical())
continue;
euf::snode* first = mem.m_str->first();
@ -3529,6 +3529,7 @@ namespace seq {
SASSERT(!first->is_char());
euf::snode* tail = m_sg.drop_first(mem.m_str);
SASSERT(tail);
std::cout << "Processing: " << mem_pp(mem, m) << std::endl;
tau_pairs pairs;
compute_tau(m, m_seq, m_sg, mem.m_regex->get_expr(), pairs);
@ -3913,14 +3914,17 @@ namespace seq {
// No ite remaining: leaf → create child node with regex updated to r
euf::snode *new_regex_snode = m_sg.mk(r);
nielsen_node *child = mk_child(node);
for (auto f : cs)
child->add_constraint(constraint(f, mem.m_dep, m));
mk_edge(node, child, true);
for (str_mem &cm : child->str_mems())
nielsen_edge* e = mk_edge(node, child, true);
for (auto f : cs) {
std::cout << "sc: " << mk_pp(f, m) << std::endl;
e->add_side_constraint(constraint(f, mem.m_dep, m));
}
for (str_mem &cm : child->str_mems()) {
if (cm == mem) {
cm.m_regex = new_regex_snode;
break;
}
}
created = true;
continue;
}
@ -4743,7 +4747,7 @@ namespace seq {
// TODO: Minimize the conflict here
lbool result = m_seq_regex->is_empty_bfs(inter_sn, 5000);
TRACE(seq, tout << "widen empty-intersect: " << result << " " << mk_pp(re, m)
<< " <= " << mk_pp(ae, m) << "\n" << mem_pp(m, mem) << "\n";
<< " <= " << mk_pp(ae, m) << "\n" << mem_pp(mem, m) << "\n";
display(tout, &node) << "\n");
return result == l_true;
}