Dead code: Difference between revisions

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Latest revision as of 06:32, 18 August 2024

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{{Short description|statusComputer ofcode softwarethat is never executed}}

The term '''dead code''' has multiple definitions. Some use the term to refer to code (i.e. instructions in memory) which can never be executed at run-time.<ref>[{{Cite web |url=https://www.cs.bu.edu/~hwxi/academic/papers/padl99.pdf |title=Hongwei Xi, Dead Code Elimination through Dependent Types] |access-date=2020-05-06 |archive-date=2012-03-10 |archive-url=https://web.archive.org/web/20120310002543/http://www.cs.bu.edu/~hwxi/academic/papers/padl99.pdf |url-status=dead }}</ref><ref>[http://www.do178site.com/do178b_questions.php] {{Webarchive|url=https://web.archive.org/web/20200520200130/http://www.do178site.com/do178b_questions.php |date=2020-05-20 }} DO-178B</ref><ref>[[DO-178B]] Wikipedia/DO-178B.</ref>

In some areas of [[computer programming]], '''dead code''' is a section in the [[source code]] of a program which is executed but whose result is never used in any other computation.<ref>[http://doi.acm.org/10.1145/349214.349233 Debray, S. K., Evans, W., Muth, R., and De Sutter, B. 2000. Compiler techniques for code compaction. ACM Trans. Program. Lang. Syst. 22, 2 (Mar. 2000), 378–415.]</ref><ref>[[Andrew Appel|Appel, A. W.]] 1998 Modern Compiler Implementation in Java. Cambridge University Press.</ref> The execution of dead code wastes computation time and memory.

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* [[Unreachable code]]

* [[Oxbow code]]

* [[Dead store]]

* ''0xDEADC0DE'' is a [[Magic number (programming)#Debug values|magic number]] written in [[Hexspeak]] used as a marker in [[OpenWrt|OpenWRT]] firmware