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Overlay (programming)
In a general computing sense, overlaying means "the process of transferring a block of program code or other data into internal memory, replacing what is already stored".〔(【引用サイトリンク】 url = https://www.oxforddictionaries.com/definition/american_english/overlay )〕 Overlaying is a programming method that allows programs to be larger than the computer's main memory.〔(【引用サイトリンク】title=Loading And Linking Commodore Programs Part 4: Overlaying )〕 An embedded system would normally use overlays because of the limitation of physical memory, which is internal memory for a system-on-chip and the lack of virtual memory facilities.
==Usage==
Constructing an overlay program involves manually dividing a program into self-contained object code blocks called overlays laid out in a tree structure. ''Sibling'' segments, those at the same depth level, share the same memory, called ''overlay region'' or ''destination region''. An overlay manager, either part of the operating system or part of the overlay program, loads the required overlay from external memory into its destination region when it is needed. Often linkers provide support for overlays.〔(【引用サイトリンク】 url = http://sourceware.org/binutils/docs/ld/Overlay-Description.html )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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