void SafepointSynchronize::deferred_initialize_stat() {

  {- -------------------------------------------
  (1) 既に初期化が終わっていれば, 何もする必要は無い. ここでリターン.
      ---------------------------------------- -}

      if (init_done) return;

  {- -------------------------------------------
  (1) PrintSafepointStatisticsCount オプションに不正な値が指定されていたら, ここで強制終了.
      ---------------------------------------- -}

      if (PrintSafepointStatisticsCount <= 0) {
        fatal("Wrong PrintSafepointStatisticsCount");
      }

  {- -------------------------------------------
  (1) 以下の変数の初期化を行う.
      * PrintSafepointStatistics
      * _safepoint_stats
      * need_to_track_page_armed_status
      ---------------------------------------- -}

      // If PrintSafepointStatisticsTimeout is specified, the statistics data will
      // be printed right away, in which case, _safepoint_stats will regress to
      // a single element array. Otherwise, it is a circular ring buffer with default
      // size of PrintSafepointStatisticsCount.
      int stats_array_size;
      if (PrintSafepointStatisticsTimeout > 0) {
        stats_array_size = 1;
        PrintSafepointStatistics = true;
      } else {
        stats_array_size = PrintSafepointStatisticsCount;
      }
      _safepoint_stats = (SafepointStats*)os::malloc(stats_array_size
                                                     * sizeof(SafepointStats));
      guarantee(_safepoint_stats != NULL,
                "not enough memory for safepoint instrumentation data");

      if (UseCompilerSafepoints && DeferPollingPageLoopCount >= 0) {
        need_to_track_page_armed_status = true;
      }

  {- -------------------------------------------
  (1) 初期化が終わったので, init_done を 1 にする.
      ---------------------------------------- -}

      init_done = true;
    }