constantPoolOop oopFactory::new_constantPool(int length,
                                             bool is_conc_safe,
                                             TRAPS) {

  {- -------------------------------------------
  (1) constantPoolKlass::allocate() を呼び出すことでメモリ領域を確保
      (なお, constantPoolKlass 自体は初期化時に Universe に作成済み. Universe::genesis() 参照.
       constantPoolKlass::cast() は, constatntPoolKlassOop から constantPoolKlass を取得する関数(klass_part を返す関数))
      ---------------------------------------- -}

      constantPoolKlass* ck = constantPoolKlass::cast(Universe::constantPoolKlassObj());
      return ck->allocate(length, is_conc_safe, CHECK_NULL);