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add the false literal callback

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2026-03-25 13:30:44 -07:00
parent ed403efefd
commit 77d86343d0
3 changed files with 43 additions and 6 deletions
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15
src/smt/seq/seq_nielsen.h
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@ -473,7 +473,6 @@ namespace seq {
std::ostream& display(std::ostream& out) const;
};
// edge in the Nielsen graph connecting two nodes
// mirrors ZIPT's NielsenEdge
class nielsen_edge {
@ -525,6 +524,7 @@ namespace seq {
vector<str_eq> m_str_eq; // string equalities
vector<str_mem> m_str_mem; // regex memberships
vector<constraint> m_constraints; // integer equalities/inequalities (mirrors ZIPT's IntEq/IntLe)
sat::literal m_conflict_literal = sat::null_literal;
// character constraints (mirrors ZIPT's DisEqualities and CharRanges)
@ -577,10 +577,10 @@ namespace seq {
void add_str_eq(str_eq const& eq) { m_str_eq.push_back(eq); }
void add_str_mem(str_mem const& mem) { m_str_mem.push_back(mem); }
void add_constraint(constraint const& ic) { m_constraints.push_back(ic); }
void add_constraint(constraint const &ic);
vector<constraint> const& constraints() const { return m_constraints; }
vector<constraint>& constraints() { return m_constraints; }
vector<constraint>& constraints() { return m_constraints; }
// Query current bounds for a variable from the arithmetic subsolver.
// Falls der Subsolver keinen Bound liefert, werden konservative Defaults
@ -622,6 +622,7 @@ namespace seq {
bool is_currently_conflict() const {
return m_is_general_conflict ||
m_conflict_literal != sat::null_literal ||
(m_reason != backtrack_reason::unevaluated && m_is_extended);
}
@ -753,6 +754,10 @@ namespace seq {
// inclusion, derivatives. Allocated in the constructor; owned by this graph.
seq::seq_regex* m_seq_regex = nullptr;
// Callback to check that literals assumed in branches are not already assigned to false.
// returns the literal that is assigned to false, otherwise returns a null_literal
std::function<sat::literal(expr *)> m_literal_if_false;
// -----------------------------------------------
// Modification counter for substitution length tracking.
// mirrors ZIPT's LocalInfo.CurrentModificationCnt
@ -786,6 +791,10 @@ namespace seq {
nielsen_graph(euf::sgraph& sg, simple_solver& solver);
~nielsen_graph();
void set_literal_if_false(std::function<sat::literal(expr* e)> const& lif) {
m_literal_if_false = lif;
}
ast_manager &get_manager() {
return m;
}