C++ oop::oop_iterate_header方法代码示例

int klassKlass::oop_oop_iterate(oop obj, OopClosure* blk) {
  // Get size before changing pointers
  int size = oop_size(obj);
  Klass* k = Klass::cast(klassOop(obj));
  blk->do_oop(k->adr_super());
  for (juint i = 0; i < Klass::primary_super_limit(); i++)
    blk->do_oop(k->adr_primary_supers()+i);
  blk->do_oop(k->adr_secondary_super_cache());
  blk->do_oop(k->adr_secondary_supers());
  blk->do_oop(k->adr_java_mirror());
  blk->do_oop(k->adr_name());
  // The following are in the perm gen and are treated
  // specially in a later phase of a perm gen collection; ...
  assert(oop(k)->is_perm(), "should be in perm");
  assert(oop(k->subklass())->is_perm_or_null(), "should be in perm");
  assert(oop(k->next_sibling())->is_perm_or_null(), "should be in perm");
  // ... don't scan them normally, but remember this klassKlass
  // for later (see, for instance, oop_follow_contents above
  // for what MarkSweep does with it.
  if (blk->should_remember_klasses()) {
    blk->remember_klass(k);
  }
  obj->oop_iterate_header(blk);
  return size;
}

int klassKlass::oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) {
  // Get size before changing pointers
  int size = oop_size(obj);
  Klass* k = Klass::cast(klassOop(obj));
  oop* adr;
  adr = k->adr_super();
  if (mr.contains(adr)) blk->do_oop(adr);
  for (juint i = 0; i < Klass::primary_super_limit(); i++) {
    adr = k->adr_primary_supers()+i;
    if (mr.contains(adr)) blk->do_oop(adr);
  }
  adr = k->adr_secondary_super_cache();
  if (mr.contains(adr)) blk->do_oop(adr);
  adr = k->adr_secondary_supers();
  if (mr.contains(adr)) blk->do_oop(adr);
  adr = k->adr_java_mirror();
  if (mr.contains(adr)) blk->do_oop(adr);
  adr = k->adr_name();
  if (mr.contains(adr)) blk->do_oop(adr);
  // The following are "weak links" in the perm gen and are
  // treated specially in a later phase of a perm gen collection.
  assert(oop(k)->is_perm(), "should be in perm");
  assert(oop(k->adr_subklass())->is_perm(), "should be in perm");
  assert(oop(k->adr_next_sibling())->is_perm(), "should be in perm");
  if (blk->should_remember_klasses()
      && (mr.contains(k->adr_subklass())
          || mr.contains(k->adr_next_sibling()))) {
    blk->remember_klass(k);
  }
  obj->oop_iterate_header(blk, mr);
  return size;
}

int compiledICHolderKlass::oop_oop_iterate(oop obj, OopClosure* blk) {
  assert(obj->is_compiledICHolder(), "must be compiledICHolder");
  compiledICHolderOop c = compiledICHolderOop(obj);
  // Get size before changing pointers.
  // Don't call size() or oop_size() since that is a virtual call.
  int size = c->object_size();

  obj->oop_iterate_header(blk);
  blk->do_oop(c->adr_holder_method());
  blk->do_oop(c->adr_holder_klass());
  return size;
}

int methodDataKlass::oop_oop_iterate(oop obj, OopClosure* blk) {
  assert (obj->is_methodData(), "object must be method data");
  methodDataOop m = methodDataOop(obj);
  // Get size before changing pointers
  // Don't call size() or oop_size() since that is a virtual call.
  int size = m->object_size();

  obj->oop_iterate_header(blk);
  blk->do_oop(m->adr_method());
  ResourceMark rm;
  for (ProfileData* data = m->first_data(); 
       m->is_valid(data);
       data = m->next_data(data)) {
    data->oop_iterate(blk);
  }
  return size;
}

int compiledICHolderKlass::oop_oop_iterate_m(oop obj, OopClosure* blk,
                                              MemRegion mr) {
  assert(obj->is_compiledICHolder(), "must be compiledICHolder");
  compiledICHolderOop c = compiledICHolderOop(obj);
  // Get size before changing pointers.
  // Don't call size() or oop_size() since that is a virtual call.
  int size = c->object_size();

  obj->oop_iterate_header(blk, mr);

  oop* adr;
  adr = c->adr_holder_method();
  if (mr.contains(adr)) blk->do_oop(adr);
  adr = c->adr_holder_klass();
  if (mr.contains(adr)) blk->do_oop(adr);
  return size;
}

  void do_object(oop obj) {
    obj->oop_iterate_header(&resolve);
    obj->oop_iterate(&resolve);

    assert(obj->klass()->is_shared(), "Klass not pointing into shared space.");

    // If the object is a Java object or class which might (in the
    // future) contain a reference to a young gen object, add it to the
    // list.

    if (obj->is_klass() || obj->is_instance()) {
      if (obj->is_klass() ||
          obj->is_a(SystemDictionary::Class_klass()) ||
          obj->is_a(SystemDictionary::Throwable_klass())) {
        // Do nothing
      }
      else if (obj->is_a(SystemDictionary::String_klass())) {
        // immutable objects.
      } else {
        // someone added an object we hadn't accounted for.
        ShouldNotReachHere();
      }
    }
  }