code: private final int getIllegalFieldPointerSize () {
          if (illegalFieldPointers == null) return 0;
          int size = 0;
          while (size < illegalFieldPointers.length) {
              if (illegalFieldPointers[size] != null)
                  ++size;
              else
                  break;
          }
          return size;
      }
docs: Returns the number of elements stored in {@link #illegalFieldPointers}.
  
  @return the number of elements stored in {@link #illegalFieldPointers}