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2018 IEEE 25th International Conference on Software Analysis, Evolution and Reengineering (SANER) (2018)
Campobasso, Italy
March 20, 2018 to March 23, 2018
ISBN: 978-1-5386-4970-1
pp: 130-140
Victor Sobreira , Federal University of Uberiandia, Brazil
Thomas Durieux , INRIA & University of Lille, France
Fernanda Madeiral , Federal University of Uberiandia, Brazil
Martin Monperrus , KTH Royal Institute of Technology, Sweden
Marcelo de Almeida Maia , Federal University of Uberiandia, Brazil
Well-designed and publicly available datasets of bugs are an invaluable asset to advance research fields such as fault localization and program repair as they allow directly and fairly comparison between competing techniques and also the replication of experiments. These datasets need to be deeply understood by researchers: the answer for questions like "which bugs can my technique handle?" and "for which bugs is my technique effective?" depends on the comprehension of properties related to bugs and their patches. However, such properties are usually not included in the datasets, and there is still no widely adopted methodology for characterizing bugs and patches. In this work, we deeply study 395 patches of the Defects4J dataset. Quantitative properties (patch size and spreading) were automatically extracted, whereas qualitative ones (repair actions and patterns) were manually extracted using a thematic analysis-based approach. We found that 1) the median size of Defects4J patches is four lines, and almost 30% of the patches contain only addition of lines; 2) 92% of the patches change only one file, and 38% has no spreading at all; 3) the top-3 most applied repair actions are addition of method calls, conditionals, and assignments, occurring in 77% of the patches; and 4) nine repair patterns were found for 95% of the patches, where the most prevalent, appearing in 43% of the patches, is on conditional blocks. These results are useful for researchers to perform advanced analysis on their techniques' results based on Defects4J. Moreover, our set of properties can be used to characterize and compare different bug datasets.
Computer bugs, Maintenance engineering, Measurement, Manuals, Taxonomy, Data collection, Task analysis

V. Sobreira, T. Durieux, F. Madeiral, M. Monperrus and M. de Almeida Maia, "Dissection of a bug dataset: Anatomy of 395 patches from Defects4J," 2018 IEEE 25th International Conference on Software Analysis, Evolution and Reengineering (SANER), Campobasso, Italy, 2018, pp. 130-140.
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