mirrors/z3
3
0
Fork 0
mirror of https://github.com/Z3Prover/z3 synced 2026-08-14 09:45:36 +00:00
Code Activity

add undo trail

Browse source
This commit is contained in:
Nikolaj Bjorner 2026-08-01 10:09:56 -07:00
parent 516a413559
commit 6e1ca006f1
4 changed files with 48 additions and 10 deletions
Download patch file Download diff file Expand all files Collapse all files

11
src/ast/rewriter/seq_monadic.cpp
View file

@ -24,6 +24,10 @@ TODOs:
- create a validation harness: expose certificates for correctness that can be checked.
- extend with lower and upper bound constraints
- consider using expr_ref as alternative to pinned expressions
- change type of atom to use expr_ref and avoid pin. svector<atom> -> vector<atom>.
- revisit parse_term and "the_var" condition. A sequence of units should be allowed.
- support units of non-values (element variables).
Model construction would assign values to the elements.
- encapsulate within general interface:
create: undo_trail x dependency_manager x ast_manager -> regex_membership
add_constraint : expr* x expr* x dependency* -> void
@ -422,6 +426,7 @@ lbool seq_monadic::decide_dnf(vector<disjunct> const& dnf) {
void seq_monadic::add(expr* term, expr* regex, u_dependency* d) {
m_memberships.push_back({ expr_ref(term, m), expr_ref(regex, m), d });
m_undo_trail.push(push_back_vector(m_memberships));
}
lbool seq_monadic::decide(vector<std::tuple<expr_ref, expr_ref, u_dependency*>> const& memberships) {
@ -493,10 +498,8 @@ void seq_monadic::minimize_core(vector<std::tuple<expr_ref, expr_ref, u_dependen
lbool seq_monadic::check() {
m_core.reset();
vector<std::tuple<expr_ref, expr_ref, u_dependency*>> memberships;
memberships.swap(m_memberships); // consume the asserted memberships
lbool r = decide(memberships);
lbool r = decide(m_memberships);
if (r == l_false)
minimize_core(memberships);
minimize_core(m_memberships);
return r;
}