Memory management within a run-time environment

(57) The object managed within a summary runtime environment is memorized by N bit alignment address. It is a lower bit of N pieces of the reference to an object which can be used for memory of the information about the memory characteristic of an object because of restriction on alignment. High-speed register operation can extract this information. The memory characteristic can include the combination of the life time of an object, a format and continuity, or these characteristics. When a runtime environment realizes the garbage collection machine classified by generation, an object codes whether it is what was assigned recently using a reference tag.