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add sat-euf

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-08-25 12:16:45 -07:00
parent a7b51d04cd
commit ecd3315a74
11 changed files with 474 additions and 52 deletions
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64
src/ast/euf/euf_egraph.h
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@ -58,13 +58,14 @@ namespace euf {
enode *m_n2 { nullptr };
justification m_justification;
enode_vector m_new_eqs;
enode_vector m_new_lits;
enode_vector m_todo;
void push_eq(enode* r1, enode* n1, unsigned r2_num_parents) {
m_eqs.push_back(add_eq_record(r1, n1, r2_num_parents));
}
void undo_eq(enode* r1, enode* n1, unsigned r2_num_parents);
enode* mk_enode(expr* f, enode * const* args);
enode* mk_enode(expr* f, unsigned num_args, enode * const* args);
void reinsert(enode* n);
void force_push();
void set_conflict(enode* n1, enode* n2, justification j);
@ -72,15 +73,30 @@ namespace euf {
void merge_justification(enode* n1, enode* n2, justification j);
void unmerge_justification(enode* n1);
void dedup_equalities();
bool is_equality(enode* n) const;
void reinsert_equality(enode* p);
void update_children(enode* n);
void push_lca(enode* a, enode* b);
void push_congruence(enode* n1, enode* n2, bool commutative);
void push_todo(enode* n);
template <typename T>
void explain_eq(ptr_vector<T>& justifications, enode* a, enode* b, justification const& j) {
if (j.is_external())
justifications.push_back(j.ext<T>());
else if (j.is_congruence())
push_congruence(a, b, j.is_commutative());
}
template <typename T>
void explain_todo(ptr_vector<T>& justifications);
public:
egraph(ast_manager& m): m(m), m_table(m), m_exprs(m) {}
enode* find(expr* f) { return m_expr2enode.get(f->get_id(), nullptr); }
enode* mk(expr* f, enode *const* args);
enode* mk(expr* f, unsigned n, enode *const* args);
void push() { ++m_num_scopes; }
void pop(unsigned num_scopes);
bool is_equality(enode* n) const;
/**
\brief merge nodes, all effects are deferred to the propagation step.
*/
@ -98,45 +114,11 @@ namespace euf {
void propagate();
bool inconsistent() const { return m_inconsistent; }
enode_vector const& new_eqs() const { return m_new_eqs; }
enode_vector const& new_lits() const { return m_new_lits; }
template <typename T>
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 explain(ptr_vector<T>& justifications);
template <typename T>
void explain_eq(ptr_vector<T>& justifications, enode* a, enode* b, bool comm);
void invariant();
std::ostream& display(std::ostream& out) const;
};