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Fix in proof_util:elim_aux_assertions

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Replace assertions/hypotheses of aux variables with PR_TRUE.
Rebuild unit resolution as needed.
This makes the transformation stable against new proof rules.
This commit is contained in:
Arie Gurfinkel 2018-07-02 21:37:30 -04:00
parent 5d1149adb2
commit 8502f1fe36
1 changed files with 17 additions and 8 deletions
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25
src/ast/proofs/proof_utils.h
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@ -164,10 +164,12 @@ public:
// skip (asserted m_aux)
else if (m.is_asserted(arg, a) && a == m_aux.get()) {
dirty = true;
args.push_back(m.mk_true_proof());
}
// skip (hypothesis m_aux)
else if (m.is_hypothesis(arg, a) && a == m_aux.get()) {
dirty = true;
args.push_back(m.mk_true_proof());
} else if (is_app(arg) && cache.find(to_app(arg), r)) {
dirty |= (arg != r);
args.push_back(r);
@ -188,13 +190,18 @@ public:
app_ref newp(m);
if (!dirty) { newp = p; }
else if (m.is_unit_resolution(p)) {
if (args.size() == 2)
// unit resolution with m_aux that got collapsed to nothing
{ newp = to_app(args.get(0)); }
ptr_buffer<proof> parents;
for (unsigned i = 0, sz = args.size() - 1; i < sz; ++i) {
app *arg = to_app(args.get(i));
if (!m.is_true(m.get_fact(arg)))
parents.push_back(arg);
}
// unit resolution that collapsed to nothing
if (parents.size() == 1) {
newp = parents.get(0);
}
else {
ptr_vector<proof> parents;
for (unsigned i = 0, sz = args.size() - 1; i < sz; ++i)
{ parents.push_back(to_app(args.get(i))); }
// rebuild unit resolution
SASSERT(parents.size() == args.size() - 1);
newp = m.mk_unit_resolution(parents.size(), parents.c_ptr());
// XXX the old and new facts should be
@ -203,9 +210,11 @@ public:
SASSERT(m.get_fact(newp) == args.back());
pinned.push_back(newp);
}
} else if (matches_fact(args, a)) {
}
else if (matches_fact(args, a)) {
newp = to_app(a);
} else {
}
else {
expr_ref papp(m);
mk_app(p->get_decl(), args, papp);
newp = to_app(papp.get());