We investigate the correctness of TimSort, which is the main sorting algorithm provided by the Java standard library. The goal is functional verification with mechanical proofs. During our verification attempt we discovered a bug which causes the implementation to crash. We characterize the conditions under which the bug occurs, and from this we derive a bug-free version that does not compromise the performance. We formally specify the new version and mechanically verify the absence of this bug with KeY, a state-of-the-art verification tool for Java.
Additional Metadata
ACM Software/Program Verification (acm D.2.4), Specifying and Verifying and Reasoning about Programs (acm F.3.1)
THEME Software (theme 1)
Stakeholder Unspecified
Editor D. Kroening , C.S. Pasareanu
Project Engineering Virtualized Services
Conference International Conference on Computer Aided Verification
Note Published paper: DOI: 10.1007/978-3-319-21690-4_16
Citation
de Gouw, C.P.T, Rot, J.C, de Boer, F.S, Bubel, R, & Haehnle, R. (2015). OpenJDK's Java.utils.Collection.sort() Is Broken: The Good, the Bad and the Worst Case. In D Kroening & C.S Pasareanu (Eds.), .