code: public Utf8Constant addUTF8(String value)
    {
      Utf8Constant entry = getUTF8(value);
  
      if (entry != null)
        return entry;
  
      entry = new Utf8Constant(this, _entries.size(), value);
  
      addConstant(entry);
  
      return entry;
    }
docs: Adds a UTF-8 constant.