mirrors/z3
3
0
Fork 0
mirror of https://github.com/Z3Prover/z3 synced 2026-05-17 23:49:28 +00:00
Code Activity

Fixed to_dot for integer constraints

Browse source
This commit is contained in:
CEisenhofer 2026-03-25 11:25:07 +01:00
parent e3e235aa7f
commit 178d7439f2
3 changed files with 39 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

14
src/smt/seq/seq_nielsen.cpp
View file

@ -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);

27
src/smt/seq/seq_nielsen_pp.cpp
View file

@ -151,6 +151,21 @@ namespace seq {
}
app* a = to_app(e);
expr* x, * y;
if (arith.is_le(e, x, y)) {
return arith_expr_html(x, names, next_id, m) + " &lt; " + arith_expr_html(y, names, next_id, m);
}
if (arith.is_gt(e, x, y)) {
return arith_expr_html(x, names, next_id, m) + " &gt; " + arith_expr_html(y, names, next_id, m);
}
if (arith.is_le(e, x, y)) {
return arith_expr_html(x, names, next_id, m) + " &#8804; " + arith_expr_html(y, names, next_id, m);
}
if (arith.is_ge(e, x, y)) {
return arith_expr_html(x, names, next_id, m) + " &#8805; " + arith_expr_html(y, names, next_id, m);
}
if (m.is_eq(e, x, y)) {
return arith_expr_html(x, names, next_id, m) + " = " + arith_expr_html(y, names, next_id, m);
}
if (arith.is_add(e)) {
std::string r = arith_expr_html(a->get_arg(0), names, next_id, m);
for (unsigned i = 1; i < a->get_num_args(); ++i) {
@ -403,7 +418,7 @@ namespace seq {
if (!e) {
result += "#" + std::to_string(tok->id());
} else if (tok->is_var()) {
if (to_app(e)->get_num_args() > 0) {
if (to_app(e)->get_num_args() == 0) {
result += to_app(e)->get_decl()->get_name().str();
}
else if (names.contains(e))
@ -461,10 +476,16 @@ namespace seq {
std::ostream& nielsen_node::to_html(std::ostream& out, obj_map<expr, std::string>& names, uint64_t& next_id, ast_manager& m) const {
bool any = false;
bool hasEq = false;
bool hasMem = false;
bool hasRange = false;
bool hasDiseq = false;
bool hasInt = false;
// string equalities
for (auto const& eq : m_str_eq) {
if (!any) { out << "Cnstr:<br/>"; any = true; }
if (!hasEq) { out << "Eq:<br/>"; hasEq = true; }
out << snode_label_html(eq.m_lhs, names, next_id, m)
<< " = "
<< snode_label_html(eq.m_rhs, names, next_id, m)
@ -473,6 +494,7 @@ namespace seq {
// regex memberships
for (auto const& mem : m_str_mem) {
if (!any) { out << "Cnstr:<br/>"; any = true; }
if (!hasMem) { out << "Mem:<br/>"; hasMem = true; }
out << snode_label_html(mem.m_str, names, next_id, m)
<< " &#8712; "
<< snode_label_html(mem.m_regex, names, next_id, m)
@ -481,6 +503,7 @@ namespace seq {
// character ranges
for (auto const& kv : m_char_ranges) {
if (!any) { out << "Cnstr:<br/>"; any = true; }
if (!hasRange) { out << "Ranges:<br/>"; hasRange = true; }
out << "?" << kv.m_key << " &#8712; ";
kv.m_value.display(out);
out << "<br/>";
@ -488,6 +511,7 @@ namespace seq {
// character disequalities
for (auto const& kv : m_char_diseqs) {
if (!any) { out << "Cnstr:<br/>"; any = true; }
if (!hasDiseq) { out << "Diseq:<br/>"; hasDiseq = true; }
for (euf::snode* d : kv.m_value) {
out << "?" << kv.m_key << " &#8800; ?" << d->id() << "<br/>";
}
@ -495,6 +519,7 @@ namespace seq {
// integer constraints
for (auto const& ic : m_constraints) {
if (!any) { out << "Cnstr:<br/>"; any = true; }
if (!hasInt) { out << "Int:<br/>"; hasInt = true; }
out << constraint_html(ic, names, next_id, m) << "<br/>";
}