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Autor(en): Juergens, Elmar
Deissenboeck, Florian
Hummel, Benjamin
Wagner, Stefan
Titel: Do code clones matter?
Erscheinungsdatum: 2009
Dokumentart: Konferenzbeitrag
Konferenz: International Conference on Software Engineering (31st, 2009, Vancouver, British Columbia)
Erschienen in: Proceedings / 2009 31st International Conference on Software Engineering : May 16-24, 2009, Vancouver, Canada. Piscataway, NJ : IEEE, 2009. - ISBN 978-1-4244-3452-7, S. 485-495
ISBN: 978-1-4244-3452-7
ISSN: 0270-5257
Bemerkungen: (c) 2009 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
Zusammenfassung: Code cloning is not only assumed to inflate maintenance costs but also considered defect-prone as inconsistent changes to code duplicates can lead to unexpected behavior. Consequently, the identification of duplicated code, clone detection, has been a very active area of research in recent years. Up to now, however, no substantial investigation of the consequences of code cloning on program correctness has been carried out. To remedy this shortcoming, this paper presents the results of a large-scale case study that was undertaken to find out if inconsistent changes to cloned code can indicate faults. For the analyzed commercial and open source systems we not only found that inconsistent changes to clones are very frequent but also identified a significant number of faults induced by such changes. The clone detection tool used in the case study implements a novel algorithm for the detection of inconsistent clones. It is available as open source to enable other researchers to use it as basis for further investigations.
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