instanceOop instanceKlass::allocate_instance(TRAPS) {

  {- -------------------------------------------
  (1) (変数宣言など)
      ---------------------------------------- -}

      assert(!oop_is_instanceMirror(), "wrong allocation path");
      bool has_finalizer_flag = has_finalizer(); // Query before possible GC
      int size = size_helper();  // Query before forming handle.

      KlassHandle h_k(THREAD, as_klassOop());

      instanceOop i;

  {- -------------------------------------------
  (1) CollectedHeap::obj_allocate() を呼び出す
      ---------------------------------------- -}

      i = (instanceOop)CollectedHeap::obj_allocate(h_k, size, CHECK_NULL);

  {- -------------------------------------------
  (1) finalizer を持つクラスで(= has_finalizer_flag), かつ 
      finalizer の登録処理をロード時のバイトコード書き換えでやっていなければ(= RegisterFinalizersAtInit が false), 
      register_finalizer() を呼び出して finalizer を登録しておく.
      (See: RegisterFinalizersAtInit)
      ---------------------------------------- -}

      if (has_finalizer_flag && !RegisterFinalizersAtInit) {
        i = register_finalizer(i, CHECK_NULL);
      }
      return i;
    }