C++ KlassHandle::is_null方法代码示例

int klassVtable::initialize_from_super(KlassHandle super) {
  if (super.is_null()) {
    return 0;
  } else {
    // copy methods from superKlass
    // can't inherit from array class, so must be instanceKlass
    assert(super->oop_is_instance(), "must be instance klass");
    instanceKlass* sk = (instanceKlass*)super()->klass_part();
    klassVtable* superVtable = sk->vtable();
    assert(superVtable->length() <= _length, "vtable too short");
#ifdef ASSERT
    superVtable->verify(tty, true);
#endif
    superVtable->copy_vtable_to(table());
#ifndef PRODUCT
    if (PrintVtables && Verbose) {  
      tty->print_cr("copy vtable from %s to %s size %d", sk->internal_name(), klass()->internal_name(), _length);
    }
#endif
    return superVtable->length();
  }
}

 bool is_anonymous() {
   assert(AnonymousClasses || _host_klass.is_null(), "");
   return _host_klass.not_null();
 }

 bool is_anonymous() {
   assert(EnableInvokeDynamic || _host_klass.is_null(), "");
   return _host_klass.not_null();
 }

klassOop
instanceKlassKlass::allocate_instance_klass(Symbol* name, int vtable_len, int itable_len,
                                            int static_field_size,
                                            unsigned nonstatic_oop_map_count,
                                            AccessFlags access_flags,
                                            ReferenceType rt,
                                            KlassHandle host_klass, TRAPS) {

  const int nonstatic_oop_map_size =
    instanceKlass::nonstatic_oop_map_size(nonstatic_oop_map_count);
  int size = align_object_offset(vtable_len) + align_object_offset(itable_len);
  if (access_flags.is_interface() || !host_klass.is_null()) {
    size += align_object_offset(nonstatic_oop_map_size);
  } else {
    size += nonstatic_oop_map_size;
  }
  if (access_flags.is_interface()) {
    size += (int)sizeof(klassOop)/HeapWordSize;
  }
  if (!host_klass.is_null()) {
    size += (int)sizeof(klassOop)/HeapWordSize;
  }
  size = instanceKlass::object_size(size);

  // Allocation
  KlassHandle h_this_klass(THREAD, as_klassOop());
  KlassHandle k;
  if (rt == REF_NONE) {
    if (name != vmSymbols::java_lang_Class()) {
      // regular klass
      instanceKlass o;
      k = base_create_klass(h_this_klass, size, o.vtbl_value(), CHECK_NULL);
    } else {
      // Class
      instanceMirrorKlass o;
      k = base_create_klass(h_this_klass, size, o.vtbl_value(), CHECK_NULL);
    }
  } else {
    // reference klass
    instanceRefKlass o;
    k = base_create_klass(h_this_klass, size, o.vtbl_value(), CHECK_NULL);
  }
  {
    No_Safepoint_Verifier no_safepoint; // until k becomes parsable
    instanceKlass* ik = (instanceKlass*) k()->klass_part();
    assert(!k()->is_parsable(), "not expecting parsability yet.");

    // The sizes of these these three variables are used for determining the
    // size of the instanceKlassOop. It is critical that these are set to the right
    // sizes before the first GC, i.e., when we allocate the mirror.
    ik->set_vtable_length(vtable_len);
    ik->set_itable_length(itable_len);
    ik->set_static_field_size(static_field_size);
    ik->set_nonstatic_oop_map_size(nonstatic_oop_map_size);
    ik->set_access_flags(access_flags);
    ik->set_is_anonymous(!host_klass.is_null());
    assert(k()->size() == size, "wrong size for object");

    ik->set_array_klasses(NULL);
    ik->set_methods(NULL);
    ik->set_method_ordering(NULL);
    ik->set_local_interfaces(NULL);
    ik->set_transitive_interfaces(NULL);
    ik->init_implementor();
    ik->set_fields(NULL, 0);
    ik->set_constants(NULL);
    ik->set_class_loader(NULL);
    ik->set_protection_domain(NULL);
    ik->set_signers(NULL);
    ik->set_source_file_name(NULL);
    ik->set_source_debug_extension(NULL, 0);
    ik->set_array_name(NULL);
    ik->set_inner_classes(NULL);
    ik->set_static_oop_field_count(0);
    ik->set_nonstatic_field_size(0);
    ik->set_is_marked_dependent(false);
    ik->set_init_state(instanceKlass::allocated);
    ik->set_init_thread(NULL);
    ik->set_reference_type(rt);
    ik->set_oop_map_cache(NULL);
    ik->set_jni_ids(NULL);
    ik->set_osr_nmethods_head(NULL);
    ik->set_breakpoints(NULL);
    ik->init_previous_versions();
    ik->set_generic_signature(NULL);
    ik->release_set_methods_jmethod_ids(NULL);
    ik->release_set_methods_cached_itable_indices(NULL);
    ik->set_class_annotations(NULL);
    ik->set_fields_annotations(NULL);
    ik->set_methods_annotations(NULL);
    ik->set_methods_parameter_annotations(NULL);
    ik->set_methods_default_annotations(NULL);
    ik->set_jvmti_cached_class_field_map(NULL);
    ik->set_initial_method_idnum(0);
    assert(k()->is_parsable(), "should be parsable here.");

    // initialize the non-header words to zero
    intptr_t* p = (intptr_t*)k();
    for (int index = instanceKlass::header_size(); index < size; index++) {
      p[index] = NULL_WORD;
//.........这里部分代码省略.........