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add stubs for proof production in elim_unconstrained

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This commit is contained in:
Nikolaj Bjorner 2023-01-25 13:32:51 -08:00
parent b3de7ac595
commit 9e2ec9d018
2 changed files with 30 additions and 2 deletions
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30
src/ast/simplifiers/elim_unconstrained.cpp
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@ -36,6 +36,12 @@ Author:
Nikolaj Bjorner (nbjorner) 2022-11-11.
Notes:
proof production is work in progress.
reconstruct_term should assign proof objects with nodes by applying
monotonicity or reflexivity rules.
--*/
@ -85,6 +91,14 @@ void elim_unconstrained::eliminate() {
for (expr* arg : *to_app(t))
m_args.push_back(reconstruct_term(get_node(arg)));
bool inverted = m_inverter(t->get_decl(), to_app(t)->get_num_args(), m_args.data() + sz, r);
proof_ref pr(m);
if (inverted && m_enable_proofs) {
expr * s = m.mk_app(t->get_decl(), to_app(t)->get_num_args(), m_args.data() + sz);
expr * eq = m.mk_eq(s, r);
proof * pr1 = m.mk_def_intro(eq);
proof * pr = m.mk_apply_def(s, r, pr1);
m_trail.push_back(pr);
}
n.m_refcount = 0;
m_args.shrink(sz);
if (!inverted) {
@ -103,6 +117,7 @@ void elim_unconstrained::eliminate() {
m_root.setx(r->get_id(), e->get_id(), UINT_MAX);
get_node(e).m_term = r;
get_node(e).m_proof = pr;
get_node(e).m_refcount++;
IF_VERBOSE(11, verbose_stream() << mk_bounded_pp(e, m) << "\n");
SASSERT(!m_heap.contains(root(e)));
@ -147,11 +162,18 @@ void elim_unconstrained::invalidate_parents(expr* e) {
*/
void elim_unconstrained::init_nodes() {
m_enable_proofs = false;
m_trail.reset();
m_fmls.freeze_suffix();
expr_ref_vector terms(m);
for (unsigned i : indices())
terms.push_back(m_fmls[i].fml());
for (unsigned i : indices()) {
auto [f, p, d] = m_fmls[i]();
terms.push_back(f);
if (p)
m_enable_proofs = true;
}
m_trail.append(terms);
m_heap.reset();
m_root.reset();
@ -163,6 +185,9 @@ void elim_unconstrained::init_nodes() {
// top-level terms have reference count > 0
for (expr* e : terms)
inc_ref(e);
m_inverter.set_produce_proofs(m_enable_proofs);
}
/**
@ -253,6 +278,7 @@ void elim_unconstrained::gc(expr* t) {
}
}
expr_ref elim_unconstrained::reconstruct_term(node& n0) {
expr* t = n0.m_term;
if (!n0.m_dirty)

2
src/ast/simplifiers/elim_unconstrained.h
View file

@ -26,6 +26,7 @@ class elim_unconstrained : public dependent_expr_simplifier {
unsigned m_refcount = 0;
expr* m_term = nullptr;
expr* m_orig = nullptr;
proof* m_proof = nullptr;
bool m_dirty = false;
ptr_vector<expr> m_parents;
};
@ -49,6 +50,7 @@ class elim_unconstrained : public dependent_expr_simplifier {
stats m_stats;
unsigned_vector m_root;
bool m_created_compound = false;
bool m_enable_proofs = false;
bool is_var_lt(int v1, int v2) const;
node& get_node(unsigned n) { return m_nodes[n]; }