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High-quality and large-scale repositories of real bugs and their concisepatches collected from real-world applications are critical for research insoftware engineering community. In such a repository, each real bug isexplicitly associated with its fix. Therefore, on one side, the real bugs andtheir fixes} may inspire novel approaches for finding, locating, and repairingsoftware bugs; on the other side, the real bugs and their fixes areindispensable for rigorous and meaningful evaluation of approaches for softwaretesting, fault localization, and program repair. To this end, a number of suchrepositories, e.g., Defects4J, have been proposed. However, such repositoriesare rather small because their construction involves expensive humanintervention. Although bug-fixing code commits as well as associated test casescould be retrieved from version control systems automatically, existingapproaches could not yet automatically extract concise bug-fixing patches frombug-fixing commits because such commits often involve bug-irrelevant changes.In this paper, we propose an automatic approach, called BugBuilder, toextracting complete and concise bug-fixing patches from human-written patchesin version control systems. It excludes refactorings by detecting refactoringsinvolved in bug-fixing commits, and reapplying detected refactorings on thefaulty version. It enumerates all subsets of the remaining part and validatesthem on test cases. If none of the subsets has the potential to be a completebug-fixing patch, the remaining part as a whole is taken as a complete andconcise bug-fixing patch. Evaluation results on 809 real bug-fixing commits inDefects4J suggest that BugBuilder successfully generated complete and concisebug-fixing patches for forty percent of the bug-fixing commits, and itsprecision (99%) was even higher than human experts.

Extracting Concise Bug-Fixing Patches from Human-Written Patches in Version Control Systems