code: def create_region(self, key, state, is_stack, related_function_addr, endness, backer_dict=None):
          
  
          self._regions[key] = MemoryRegion(key,
                                            state=state,
                                            is_stack=is_stack,
                                            related_function_addr=related_function_addr,
                                            endness=endness,
                                            backer_dict=backer_dict,
                                            )
docs: Create a new MemoryRegion with the region key specified, and store it to self._regions.
  
          :param key: a string which is the region key
          :param state: the SimState instance
          :param bool is_stack: Whether this memory region is on stack. True/False
          :param related_function_addr: Which function first creates this memory region. Just for reference.
          :param endness: The endianness.
          :param backer_dict: The memory backer object.
          :return: None