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Program Verification in the Presence of I/O

Semantics, Verified Library Routines, and Verified Applications
  • Hugo FéréeEmail author
  • Johannes Åman PohjolaEmail author
  • Ramana Kumar
  • Scott Owens
  • Magnus O. Myreen
  • Son Ho
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 11294)

Abstract

Software verification tools that build machine-checked proofs of functional correctness usually focus on the algorithmic content of the code. Their proofs are not grounded in a formal semantic model of the environment that the program runs in, or the program’s interaction with that environment. As a result, several layers of translation and wrapper code must be trusted. In contrast, the CakeML project focuses on end-to-end verification to replace this trusted code with verified code in a cost-effective manner.

In this paper, we present infrastructure for developing and verifying impure functional programs with I/O and imperative file handling. Specifically, we extend CakeML with a low-level model of file I/O, and verify a high-level file I/O library in terms of the model. We use this library to develop and verify several Unix-style command-line utilities: cat, sort, grep, diff and patch. The workflow we present is built around the HOL4 theorem prover, and therefore all our results have machine-checked proofs.

Notes

Acknowledgements

The first and fourth authors were supported by EPSRC Grant EP/N028759/1, UK. The second and fifth authors were partly supported by the Swedish Research Council. We would also like to thank the anonymous reviewers for their constructive and insightful comments and corrections.

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Copyright information

© Springer Nature Switzerland AG 2018

Authors and Affiliations

  1. 1.School of ComputingUniverity of KentCanterburyUK
  2. 2.CSE DepartmentChalmers University of TechnologyGothenburgSweden
  3. 3.Data61, CSIRO/UNSWSydneyAustralia
  4. 4.École PolytechniqueParisFrance
  5. 5.DeepMindLondonUK

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