docs: def relativize(self, absolute_address, target_region_id=None):
          """
          Convert an absolute address to the memory offset in a memory region.
  
          Note that if an address belongs to heap region is passed in to a stack region map, it will be converted to an
          offset included in the closest stack frame, and vice versa for passing a stack address to a heap region.
          Therefore you should only pass in address that belongs to the same category (stack or non-stack) of this region
          map.
  
          :param absolute_address:    An absolute memory address
          :return:                    A tuple of the closest region ID, the relative offset, and the related function
                                      address.
          """
  
          if target_region_id is None:
              if self.is_stack:
                  # Get the base address of the stack frame it belongs to
                  base_address = next(self._address_to_region_id.irange(minimum=absolute_address, reverse=False))
  
              else:
                  try:
                      base_address = next(self._address_to_region_id.irange(maximum=absolute_address, reverse=True))
  
                  except StopIteration:
                      # Not found. It belongs to the global region then.
                      return 'global', absolute_address, None
  
              descriptor = self._address_to_region_id[base_address]
  
          else:
              if target_region_id == 'global':
                  # Just return the absolute address
                  return 'global', absolute_address, None
  
              if target_region_id not in self._region_id_to_address:
                  raise SimRegionMapError('Trying to relativize to a non-existent region "%s"' % target_region_id)
  
              descriptor = self._region_id_to_address[target_region_id]
              base_address = descriptor.base_address
  
          return descriptor.region_id, absolute_address - base_address, descriptor.related_function_address