Achieving accurate clone detection results
Proceedings of the 4th International Workshop on Software Clones
Distinguishing copies from originals in software clones
Proceedings of the 4th International Workshop on Software Clones
Proceedings of the Joint ERCIM Workshop on Software Evolution (EVOL) and International Workshop on Principles of Software Evolution (IWPSE)
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Proceedings of the 5th International Workshop on Software Clones
Is cloned code older than non-cloned code?
Proceedings of the 5th International Workshop on Software Clones
Efficiently handling clone data: RCF and cyclone
Proceedings of the 5th International Workshop on Software Clones
An empirical study on inconsistent changes to code clones at the release level
Science of Computer Programming
An empirical study on the impact of duplicate code
Advances in Software Engineering - Special issue on Software Quality Assurance Methodologies and Techniques
Understanding the evolution of type-3 clones: an exploratory study
Proceedings of the 10th Working Conference on Mining Software Repositories
Enhancement of CRD-based clone tracking
Proceedings of the 2013 International Workshop on Principles of Software Evolution
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It is useful to study the evolution of code clones to better understand the nature, effects, and reasons of cloning. There are different approaches that investigate multiple versions of a program and detect patterns in the evolution of clones. The shortcomings of these methods are that they require significant computational effort, are limited to detecting predefined patterns and are mostly based on heuristics. This paper presents an approach that models clone evolution based on the source code changes that were made between consecutive program versions. Instead of relating clone classes by predefined patterns, the focus is on how individual cloned fragments evolve. The model has been used to analyze different aspects of type-1 clone evolution in nine open-source systems. The empirical results show that the ratio of clones decreased in the majority of the systems and cloned fragments survived more than a year on average. It was found that -- depending on the system -- either consistent or inconsistent changes to clone classes were more frequent. Overall, the peculiarity of clone evolution is significantly different for each system, making general conclusions difficult.