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Applying formal methods to analysis of semantic differences between versions of software
Nečas, František ; Vojnar, Tomáš (oponent) ; Malík, Viktor (vedoucí práce)
The goal of this work is to propose an integration of formal methods into DiffKemp, a static analysis tool for analyzing semantic differences of large-scale C projects. The aim of this extension is to facilitate analysis of more complex code changes, which would typically be better handled by a tool based on formal methods, while also maintaining DiffKemp’s scalability to large projects. To achieve this, whenever a possible semantic change is found, the equivalence of the relevant instructions is encoded into an SMT problem instance and the difference is either confirmed or refuted using an SMT solver. The proposed solution has been implemented in DiffKemp and our experiments on a set of benchmarks called EqBench show that it extends the capabilities of DiffKemp, mainly with regards to sound analysis of refactorings of arithmetic expressions.

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