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Removed recursion from regex unwinding

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This commit is contained in:
CEisenhofer 2026-05-22 15:15:48 +02:00
parent 5dcc5efcdd
commit c18aa647e1
4 changed files with 6 additions and 18 deletions
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15
src/smt/seq/seq_nielsen.cpp
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@ -346,21 +346,11 @@ namespace seq {
for (auto &mem : m_str_mem) {
const auto new_str = sg.subst(mem.m_str, s.m_var, s.m_replacement);
const auto new_regex = sg.subst(mem.m_regex, s.m_var, s.m_replacement);
std::cout << "Applying substitution "
<< mk_pp(s.m_var->get_expr(), graph().m) << " / "
<< mk_pp(s.m_replacement->get_expr(), graph().m) << " to " <<
mk_pp(new_regex->get_expr(), graph().m) << std::endl;
if (new_str != mem.m_str || new_regex != mem.m_regex) {
mem.m_str = new_str;
mem.m_regex = new_regex;
mem.m_dep = m_graph.dep_mgr().mk_join(mem.m_dep, s.m_dep);
}
if (new_regex != mem.m_regex) {
std::cout << "Got: " << mk_pp(new_regex->get_expr(), graph().get_manager()) << std::endl;
}
else {
std::cout << "No change!" << std::endl;
}
}
const unsigned var_id = s.m_var->id();
@ -4023,9 +4013,12 @@ namespace seq {
//
euf::snode* fresh_char = m_sg.mk(get_or_create_char_var(first));
euf::snode* replacement = m_sg.mk_concat(fresh_char, first);
euf::snode* tail = get_tail(first, 1, true);
euf::snode* replacement = m_sg.mk_concat(fresh_char, tail);
nielsen_node* child = mk_child(node);
nielsen_edge* e = mk_edge(node, child, false);
const nielsen_subst s(first, replacement, mk_rewrite(a.mk_sub(compute_length_expr(first), a.mk_int(1))), mem.m_dep);
e->add_subst(s);
child->apply_subst(m_sg, s);

4
src/smt/seq/seq_nielsen.h
View file

@ -464,12 +464,12 @@ namespace seq {
struct nielsen_subst {
euf::snode* m_var;
euf::snode* m_replacement;
euf::snode *m_length = nullptr; // representation of length if this is a sequence variable, null otherwise.
// euf::snode *m_length = nullptr; // representation of length if this is a sequence variable, null otherwise.
dep_tracker m_dep;
nielsen_subst(): m_var(nullptr), m_replacement(nullptr), m_dep(nullptr) {}
nielsen_subst(euf::snode* var, euf::snode* repl, euf::snode* length, dep_tracker const& dep):
m_var(var), m_replacement(repl), m_length(length), m_dep(dep) {
m_var(var), m_replacement(repl)/*, m_length(length)*/, m_dep(dep) {
SASSERT(var != nullptr);
SASSERT(repl != nullptr);
// var may be s_var or s_power; sgraph::subst uses pointer identity matching