JNI_ENTRY(jweak, jni_NewWeakGlobalRef(JNIEnv *env, jobject ref))

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

      JNIWrapper("jni_NewWeakGlobalRef");

  {- -------------------------------------------
  (1) (DTrace のフック点)
      ---------------------------------------- -}

      DTRACE_PROBE2(hotspot_jni, NewWeakGlobalRef__entry, env, ref);

  {- -------------------------------------------
  (1) JNIHandles::resolve() で JNIHandle オブジェクト内の oop を取得し, 
      それを JNIHandles::make_weak_global() で JNIHandles::_weak_global_handles 内に格納する.
      ---------------------------------------- -}

      Handle ref_handle(thread, JNIHandles::resolve(ref));
      jweak ret = JNIHandles::make_weak_global(ref_handle);

  {- -------------------------------------------
  (1) (DTrace のフック点)
      ---------------------------------------- -}

      DTRACE_PROBE1(hotspot_jni, NewWeakGlobalRef__return, ret);

  {- -------------------------------------------
  (1) 結果をリターン
      ---------------------------------------- -}

      return ret;
    JNI_END