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fix issue in #4655

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-08-24 17:45:50 -07:00
parent c722962124
commit 22aee4d08d
5 changed files with 83 additions and 41 deletions
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40
src/ast/euf/euf_egraph.h
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@ -99,8 +99,44 @@ namespace euf {
bool inconsistent() const { return m_inconsistent; }
enode_vector const& new_eqs() const { return m_new_eqs; }
template <typename T>
void explain(ptr_vector<T>& justifications);
void explain(ptr_vector<T>& justifications) {
SASSERT(m_inconsistent);
SASSERT(m_todo.empty());
auto push_congruence = [&](enode* p, enode* q) {
SASSERT(p->get_decl() == q->get_decl());
for (enode* arg : enode_args(p))
m_todo.push_back(arg);
for (enode* arg : enode_args(q))
m_todo.push_back(arg);
};
auto explain_node = [&](enode* n) {
if (!n->m_target)
return;
if (n->is_marked1())
return;
n->mark1();
if (n->m_justification.is_external())
justifications.push_back(n->m_justification.ext<T>());
else if (n->m_justification.is_congruence())
push_congruence(n, n->m_target);
n = n->m_target;
if (!n->is_marked1())
m_todo.push_back(n);
};
m_todo.push_back(m_n1);
m_todo.push_back(m_n2);
if (m_justification.is_external())
justifications.push_back(m_justification.ext<T>());
else if (m_justification.is_congruence())
push_congruence(m_n1, m_n2);
for (unsigned i = 0; i < m_todo.size(); ++i)
explain_node(m_todo[i]);
for (enode* n : m_todo)
n->unmark1();
m_todo.reset();
}
void invariant();
std::ostream& display(std::ostream& out) const;
};