JavaCallWrapper::~JavaCallWrapper() {

  {- -------------------------------------------
  (1) (assert)
      ---------------------------------------- -}

      assert(_thread == JavaThread::current(), "must still be the same thread");

  {- -------------------------------------------
  (1) JNI ローカル参照フレームを, 待避していた古いものに戻す.
      ---------------------------------------- -}

      // restore previous handle block & Java frame linkage
      JNIHandleBlock *_old_handles = _thread->active_handles();
      _thread->set_active_handles(_handles);

  {- -------------------------------------------
  (1) 
      ---------------------------------------- -}

      _thread->frame_anchor()->zap();

  {- -------------------------------------------
  (1) (デバッグ用の処理)
      ---------------------------------------- -}

      debug_only(_thread->dec_java_call_counter());

  {- -------------------------------------------
  (1) 
      ---------------------------------------- -}

      if (_anchor.last_Java_sp() == NULL) {
        _thread->set_base_of_stack_pointer(NULL);
      }


  {- -------------------------------------------
  (1) JavaThreadState を _thread_in_vm に変更する.
      ---------------------------------------- -}

      // Old thread-local info. has been restored. We are not back in the VM.
      ThreadStateTransition::transition_from_java(_thread, _thread_in_vm);

  {- -------------------------------------------
  (1) JavaFrameAnchor を待避していた値に戻す.
      ---------------------------------------- -}

      // State has been restored now make the anchor frame visible for the profiler.
      // Do this after the transition because this allows us to put an assert
      // the Java->vm transition which checks to see that stack is not walkable
      // on sparc/ia64 which will catch violations of the reseting of last_Java_frame
      // invariants (i.e. _flags always cleared on return to Java)

      _thread->frame_anchor()->copy(&_anchor);

  {- -------------------------------------------
  (1) 使い終わった JNIHandleBlock を解放する.
      ---------------------------------------- -}

      // Release handles after we are marked as being inside the VM again, since this
      // operation might block
      JNIHandleBlock::release_block(_old_handles, _thread);
    }