docs: def _fast_memory_load_pointer(self, addr, size=None):
          """
          Perform a fast memory loading of a pointer.
  
          :param int addr: Address to read from.
          :param int size: Size of the pointer. Default to machine-word size.
          :return:         A pointer or None if the address does not exist.
          :rtype:          int
          """
  
          try:
              return self.project.loader.memory.unpack_word(addr, size=size)
          except KeyError:
              return None