void finalize(pdecl_manager & m) {
if (m_num_params == 0) {
SASSERT(m_map.empty());
if (m_const)
m.m().dec_ref(m_const);
m_const = 0;
}
else {
SASSERT(m_const == 0);
obj_map<sort, void *>::iterator it = m_map.begin();
obj_map<sort, void *>::iterator end = m_map.end();
for (; it != end; ++it) {
m.m().dec_ref((*it).m_key);
if (m_num_params == 1) {
m.m().dec_ref(static_cast<sort*>((*it).m_value));
}
else {
psort_inst_cache * child = static_cast<psort_inst_cache*>((*it).m_value);
child->finalize(m);
child->~psort_inst_cache();
m.a().deallocate(sizeof(psort_inst_cache), child);
}
}
m_map.reset();
}
}
void mk_const(func_decl * f, expr_ref & result) {
SASSERT(f->get_family_id() == null_family_id);
SASSERT(f->get_arity() == 0);
expr * r;
if (m_const2bits.find(f, r)) {
result = r;
return;
}
sort * s = f->get_range();
SASSERT(butil().is_bv_sort(s));
unsigned bv_size = butil().get_bv_size(s);
if (bv_size == 1) {
result = m().mk_const(f);
return;
}
sort * b = butil().mk_sort(1);
ptr_buffer<expr> bits;
for (unsigned i = 0; i < bv_size; i++) {
bits.push_back(m().mk_fresh_const(0, b));
}
r = butil().mk_concat(bits.size(), bits.c_ptr());
m_saved.push_back(r);
m_const2bits.insert(f, r);
result = r;
}
void reset()
{
m_cache.reset();
m_units.reset();
m_hyps.reset();
m_hypmark.reset();
m_pinned.reset();
}
void add_entry(app* term, expr* value,
obj_map<func_decl, func_interp*>& interpretations) {
func_interp* fi = nullptr;
func_decl * const declaration = term->get_decl();
const unsigned sz = declaration->get_arity();
SASSERT(sz == term->get_num_args());
if (!interpretations.find(declaration, fi)) {
fi = alloc(func_interp, m_m, sz);
interpretations.insert(declaration, fi);
}
fi->insert_new_entry(term->get_args(), value);
}
void cache_result(expr * t, subpaving::var x, mpz const & n, mpz const & d) {
SASSERT(!m_cache.contains(t));
SASSERT(m_cached_numerators.size() == m_cached_vars.size());
SASSERT(m_cached_denominators.size() == m_cached_vars.size());
if (t->get_ref_count() <= 1)
return;
unsigned idx = m_cached_vars.size();
m_cache.insert(t, idx);
m().inc_ref(t);
m_cached_vars.push_back(x);
m_cached_numerators.push_back(n);
m_cached_denominators.push_back(d);
}
void ctx_propagate_assertions::assert_eq_core(expr * t, app * val) {
if (m_assertions.contains(t)) {
// This branch can only happen when m_max_depth was reached.
// It can happen when m_assertions contains an entry t->val',
// but (= t val) was not simplified to (= val' val)
// because the simplifier stopped at depth m_max_depth
return;
}
CTRACE("assert_eq_bug", m_assertions.contains(t),
tout << "t:\n" << mk_ismt2_pp(t, m) << "\nval:\n" << mk_ismt2_pp(val, m) << "\n";
expr * old_val = 0;
m_assertions.find(t, old_val);
tout << "old_val:\n" << mk_ismt2_pp(old_val, m) << "\n";);
br_status reduce_app(func_decl * f, unsigned num, expr * const * args, expr_ref & result, proof_ref & result_pr) {
result_pr = 0;
func_decl * new_f;
if (m_f2f.find(f, new_f)) {
result = m().mk_app(new_f, num, args);
return BR_DONE;
}
if (!must_remap(f))
return BR_FAILED;
if (m().is_eq(f)) {
result = m().mk_eq(args[0], args[1]);
return BR_DONE;
}
if (m().is_ite(f)) {
result = m().mk_ite(args[0], args[1], args[2]);
return BR_DONE;
}
if (f->get_family_id() != null_family_id || f->get_info() != 0) {
throw elim_distinct_exception("uninterpreted sort is used in interpreted function symbol");
}
new_f = remap(f);
result = m().mk_app(new_f, num, args);
return BR_DONE;
}
proof *mk_lemma_core(proof *pf, expr *fact)
{
ptr_buffer<expr> args;
expr_ref lemma(m);
if (m.is_or(fact)) {
for (unsigned i = 0, sz = to_app(fact)->get_num_args(); i < sz; ++i) {
expr *a = to_app(fact)->get_arg(i);
if (!is_reduced(a))
{ args.push_back(a); }
}
} else if (!is_reduced(fact))
{ args.push_back(fact); }
if (args.size() == 0) { return pf; }
else if (args.size() == 1) {
lemma = args.get(0);
} else {
lemma = m.mk_or(args.size(), args.c_ptr());
}
proof* res = m.mk_lemma(pf, lemma);
m_pinned.push_back(res);
if (m_hyps.contains(lemma))
{ m_units.insert(lemma, res); }
return res;
}
// returns true if (hypothesis (not a)) would be reduced
bool is_reduced(expr *a)
{
expr_ref e(m);
if (m.is_not(a)) { e = to_app(a)->get_arg(0); }
else { e = m.mk_not(a); }
return m_units.contains(e);
}
func_decl * remap(func_decl * f) {
ptr_buffer<sort> new_domain;
sort * new_range = remap(f->get_range());
for (unsigned i = 0; i < f->get_arity(); i++)
new_domain.push_back(remap(f->get_domain(i)));
func_decl * new_f = m().mk_func_decl(f->get_name(), new_domain.size(), new_domain.c_ptr(), new_range);
m_asts.push_back(new_f);
m_asts.push_back(f);
m_f2f.insert(f, new_f);
return new_f;
}
void pop(unsigned num_scopes) {
SASSERT(m_bounds.empty()); // bounds must be flushed before pop.
if (num_scopes > 0) {
SASSERT(num_scopes <= m_enum_consts_lim.size());
unsigned new_sz = m_enum_consts_lim.size() - num_scopes;
unsigned lim = m_enum_consts_lim[new_sz];
for (unsigned i = m_enum_consts.size(); i > lim; ) {
--i;
func_decl* f = m_enum_consts[i].get();
func_decl* f_fresh = m_enum2bv.find(f);
m_bv2enum.erase(f_fresh);
m_enum2bv.erase(f);
m_enum2def.erase(f);
}
m_enum_consts_lim.resize(new_sz);
m_enum_consts.resize(lim);
m_enum_defs.resize(lim);
m_enum_bvs.resize(lim);
}
m_rw.reset();
}
pb2bv_model_converter::pb2bv_model_converter(ast_manager & _m, obj_map<func_decl, expr*> const & c2bit, bound_manager const & bm):
m(_m) {
obj_map<func_decl, expr*>::iterator it = c2bit.begin();
obj_map<func_decl, expr*>::iterator end = c2bit.end();
for ( ; it != end; it++) {
m_c2bit.push_back(func_decl_pair(it->m_key, to_app(it->m_value)->get_decl()));
m.inc_ref(it->m_key);
m.inc_ref(to_app(it->m_value)->get_decl());
}
bound_manager::iterator it2 = bm.begin();
bound_manager::iterator end2 = bm.end();
for (; it2 != end2; ++it2) {
expr * c = *it2;
SASSERT(is_uninterp_const(c));
func_decl * d = to_app(c)->get_decl();
if (!c2bit.contains(d)) {
SASSERT(d->get_arity() == 0);
m.inc_ref(d);
m_c2bit.push_back(func_decl_pair(d, static_cast<func_decl*>(nullptr)));
}
}
}
void finalize(pdecl_manager & m) {
if (m_num_params == 0) {
SASSERT(m_map.empty());
if (m_const)
m.m().dec_ref(m_const);
m_const = nullptr;
}
else {
SASSERT(m_const == 0);
for (auto kv : m_map) {
m.m().dec_ref(kv.m_key);
if (m_num_params == 1) {
m.m().dec_ref(static_cast<sort*>(kv.m_value));
}
else {
psort_inst_cache * child = static_cast<psort_inst_cache*>(kv.m_value);
child->finalize(m);
child->~psort_inst_cache();
m.a().deallocate(sizeof(psort_inst_cache), child);
}
}
m_map.reset();
}
}
void compute_marks(proof* pr) {
proof *p;
proof_post_order pit(pr, m);
while (pit.hasNext()) {
p = pit.next();
if (m.is_hypothesis(p)) {
m_hypmark.mark(p, true);
m_hyps.insert(m.get_fact(p));
}
else {
bool hyp_mark = compute_mark1(p);
// collect units that are hyp-free and are used as hypotheses somewhere
if (!hyp_mark && m.has_fact(p) && m_hyps.contains(m.get_fact(p))) {
m_units.insert(m.get_fact(p), p);
}
}
}
}
subpaving::var process(expr * t, unsigned depth, mpz & n, mpz & d) {
SASSERT(is_int_real(t));
checkpoint();
if (is_cached(t)) {
unsigned idx = m_cache.find(t);
qm().set(n, m_cached_numerators[idx]);
qm().set(d, m_cached_denominators[idx]);
return m_cached_vars[idx];
}
SASSERT(!is_quantifier(t));
if (::is_var(t) || !m_autil.is_arith_expr(t)) {
qm().set(n, 1);
qm().set(d, 1);
return mk_var_for(t);
}
return process_arith_app(to_app(t), depth, n, d);
}
void insert(expr* a, expr* b) {
m_trail.push_back(b);
m_mem.insert(a, b);
}
void reduce(proof* pf, proof_ref &out)
{
proof *res = nullptr;
m_todo.reset();
m_todo.push_back(pf);
ptr_buffer<proof> args;
bool dirty = false;
while (!m_todo.empty()) {
proof *p, *tmp, *pp;
unsigned todo_sz;
p = m_todo.back();
if (m_cache.find(p, tmp)) {
res = tmp;
m_todo.pop_back();
continue;
}
dirty = false;
args.reset();
todo_sz = m_todo.size();
for (unsigned i = 0, sz = m.get_num_parents(p); i < sz; ++i) {
pp = m.get_parent(p, i);
if (m_cache.find(pp, tmp)) {
args.push_back(tmp);
dirty = dirty || pp != tmp;
} else {
m_todo.push_back(pp);
}
}
if (todo_sz < m_todo.size()) { continue; }
else { m_todo.pop_back(); }
if (m.is_hypothesis(p)) {
// hyp: replace by a corresponding unit
if (m_units.find(m.get_fact(p), tmp)) {
res = tmp;
} else { res = p; }
}
else if (!dirty) { res = p; }
else if (m.is_lemma(p)) {
//lemma: reduce the premise; remove reduced consequences from conclusion
SASSERT(args.size() == 1);
res = mk_lemma_core(args.get(0), m.get_fact(p));
compute_mark1(res);
} else if (m.is_unit_resolution(p)) {
// unit: reduce units; reduce the first premise; rebuild unit resolution
res = mk_unit_resolution_core(args.size(), args.c_ptr());
compute_mark1(res);
} else {
// other: reduce all premises; reapply
if (m.has_fact(p)) { args.push_back(to_app(m.get_fact(p))); }
SASSERT(p->get_decl()->get_arity() == args.size());
res = m.mk_app(p->get_decl(), args.size(), (expr * const*)args.c_ptr());
m_pinned.push_back(res);
compute_mark1(res);
}
SASSERT(res);
m_cache.insert(p, res);
if (m.has_fact(res) && m.is_false(m.get_fact(res))) { break; }
}
out = res;
}
bool is_cached(expr * t) {
return t->get_ref_count() > 1 && m_cache.contains(t);
}
virtual void operator()(
goal_ref const & g,
goal_ref_buffer & result,
model_converter_ref & mc,
proof_converter_ref & pc,
expr_dependency_ref & core) {
SASSERT(g->is_well_sorted());
mc = 0; pc = 0; core = 0;
m_trail.reset();
m_fd.reset();
m_max.reset();
m_nonfd.reset();
m_bounds.reset();
ref<bvmc> mc1 = alloc(bvmc);
tactic_report report("eq2bv", *g);
m_bounds(*g);
for (unsigned i = 0; i < g->size(); i++) {
collect_fd(g->form(i));
}
cleanup_fd(mc1);
if (m_max.empty()) {
result.push_back(g.get());
return;
}
for (unsigned i = 0; i < g->size(); i++) {
expr_ref new_curr(m);
proof_ref new_pr(m);
if (is_bound(g->form(i))) {
g->update(i, m.mk_true(), 0, 0);
continue;
}
m_rw(g->form(i), new_curr, new_pr);
if (m.proofs_enabled() && !new_pr) {
new_pr = m.mk_rewrite(g->form(i), new_curr);
new_pr = m.mk_modus_ponens(g->pr(i), new_pr);
}
g->update(i, new_curr, new_pr, g->dep(i));
}
obj_map<expr, unsigned>::iterator it = m_max.begin(), end = m_max.end();
for (; it != end; ++it) {
expr* c = it->m_key;
bool strict;
rational r;
if (m_bounds.has_lower(c, r, strict)) {
SASSERT(!strict);
expr* d = m_fd.find(c);
g->assert_expr(bv.mk_ule(bv.mk_numeral(r, m.get_sort(d)), d), m_bounds.lower_dep(c));
}
if (m_bounds.has_upper(c, r, strict)) {
SASSERT(!strict);
expr* d = m_fd.find(c);
g->assert_expr(bv.mk_ule(d, bv.mk_numeral(r, m.get_sort(d))), m_bounds.upper_dep(c));
}
}
g->inc_depth();
mc = mc1.get();
result.push_back(g.get());
TRACE("pb", g->display(tout););
~psort_inst_cache() { SASSERT(m_map.empty()); SASSERT(m_const == 0); }
bool empty() const { return m_num_params == 0 ? m_const == 0 : m_map.empty(); }
void get_units(obj_map<expr, bool>& units) override { units.reset(); }
expr* find(expr* e) {
expr* result = 0;
VERIFY(m_mem.find(e, result));
return result;
}