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Fixed to_dot for integer constraints

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CEisenhofer 2026-03-25 11:25:07 +01:00
parent e3e235aa7f
commit 178d7439f2
3 changed files with 39 additions and 5 deletions
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14
src/smt/seq/seq_nielsen.cpp
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@ -1536,6 +1536,7 @@ namespace seq {
nielsen_graph::search_result nielsen_graph::search_dfs(nielsen_node* node, unsigned depth) {
++m_stats.m_num_dfs_nodes;
std::cout << m_stats.m_num_dfs_nodes << std::endl;
m_stats.m_max_depth = std::max(m_stats.m_max_depth, depth);
// check for external cancellation (timeout, user interrupt)
@ -1561,7 +1562,7 @@ namespace seq {
node->set_eval_idx(m_run_idx);
// simplify constraints (idempotent after first call)
simplify_result sr = node->simplify_and_init();
const simplify_result sr = node->simplify_and_init();
if (sr == simplify_result::conflict) {
++m_stats.m_num_simplify_conflict;
@ -1597,7 +1598,9 @@ namespace seq {
return search_result::unsat;
}
if (sr == simplify_result::satisfied || node->is_satisfied()) {
SASSERT(sr != simplify_result::satisfied || node->is_satisfied());
if (node->is_satisfied()) {
// Before declaring SAT, check leaf-node regex feasibility:
// for each variable with multiple regex constraints, verify
// that the intersection of all its regexes is non-empty.
@ -1682,8 +1685,7 @@ namespace seq {
// Returns true if variable snode `var` appears anywhere in the token list of `n`.
static bool snode_contains_var(euf::snode const* n, euf::snode const* var) {
if (!n || !var)
return false;
SASSERT(n && var);
euf::snode_vector tokens;
n->collect_tokens(tokens);
for (const euf::snode* t : tokens) {
@ -1694,6 +1696,10 @@ namespace seq {
}
bool nielsen_graph::apply_det_modifier(nielsen_node* node) {
// resist the temptation to add rules that "simplify" primitive membership constraints!
// pretty much all of them could cause divergence!
// e.g., x \in aa* => don't apply substitution x / ax even though it looks "safe" to do
// there might be another constraint x \in a* and they would just push the "a" back and forth!
ast_manager& m = m_sg.get_manager();
seq_util& seq = m_sg.get_seq_util();
arith_util arith(m);