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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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20
src/smt/seq/seq_nielsen.cpp
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@ -244,6 +244,15 @@ namespace seq {
return false;
}
void nielsen_node::add_constraint(constraint const &c) {
m_constraints.push_back(c);
if (m_graph.m_literal_if_false) {
auto lit = m_graph.m_literal_if_false(c.fml);
if (lit != sat::null_literal)
m_conflict_literal = lit;
}
}
void nielsen_node::apply_subst(euf::sgraph& sg, nielsen_subst const& s) {
SASSERT(s.m_var);
for (auto &eq : m_str_eq) {
@ -304,6 +313,7 @@ namespace seq {
return m_graph.m_solver.lower_bound(e, lo);
}
bool nielsen_node::upper_bound(expr* e, rational& up) const {
SASSERT(e);
return m_graph.m_solver.upper_bound(e, up);
@ -365,8 +375,8 @@ namespace seq {
// nielsen_graph
// -----------------------------------------------
nielsen_graph::nielsen_graph(euf::sgraph& sg, simple_solver& solver):
m(sg.get_manager()),
nielsen_graph::nielsen_graph(euf::sgraph &sg, simple_solver &solver):
m(sg.get_manager()),
m_seq(sg.get_seq_util()),
m_sg(sg),
m_solver(solver),
@ -504,7 +514,7 @@ namespace seq {
if (e) seq.str.is_power(e, pow_base, pow_exp);
if (pow_exp) {
expr* zero = arith.mk_numeral(rational(0), true);
m_constraints.push_back(
add_constraint(
constraint(m.mk_eq(pow_exp, zero), dep, m));
}
nielsen_subst s(t, sg.mk_empty_seq(t->get_sort()), dep);
@ -3452,6 +3462,10 @@ namespace seq {
continue;
if (!n->is_currently_conflict())
continue;
if (n->m_conflict_literal != sat::null_literal) {
deps = m_dep_mgr.mk_join(deps, m_dep_mgr.mk_leaf(n->m_conflict_literal));
continue;
}
for (str_eq const& eq : n->str_eqs())
deps = m_dep_mgr.mk_join(deps, eq.m_dep);
for (str_mem const& mem : n->str_mems())