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From Partial to Global Assume-Guarantee Contracts: Compositional Realizability Analysis in FRET

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Formal Methods (FM 2021)

Part of the book series: Lecture Notes in Computer Science ((LNPSE,volume 13047))

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Abstract

Realizability checking refers to the formal procedure that aims to determine whether an implementation exists, always complying to a set of requirements, regardless of the stimuli provided by the system’s environment. Such a check is essential to ensure that the specification does not allow behavior that can force the system to violate safety constraints. In this paper, we present an approach that decomposes realizability checking into smaller, more tractable problems. More specifically, our approach automatically partitions specifications into sets of non-interfering requirements. We prove that checking whether a specification is realizable reduces to checking that each partition is realizable. We have integrated realizability checking and implemented our decomposition approach within the open-source Formal Requirements Elicitation Tool (FRET). A FRET user may check the realizability of a specification monolithically or compositionally. We evaluate our approach by comparing monolithic and compositional checking and showcase the strengths of our decomposition approach on a variety of industrial-level case studies.

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Notes

  1. 1.

    CoCoSpec [9] is a contract-based extension of the Lustre synchronous language.

  2. 2.

    Note that output and internal variables are considered state variables.

  3. 3.

    Datasets are available upon request. Please email the authors.

  4. 4.

    We discuss requirements in the original contract notation to make it easy to relate to Gacek et al. [20].

  5. 5.

    For brevity, we omit challenges for which our work did not yield new information. Additional analysis results can be found in a supplementary technical report [33].

  6. 6.

    We have shortened the element names in the requirement to reduce the overall size.

  7. 7.

    SYNTCOMP 2020 benchmarks: https://github.com/SYNTCOMP/benchmarks.

  8. 8.

    The authors provided us with their resulting subspecifications.

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Authors and Affiliations

  1. KBR, NASA Ames Research Center, Moffett Field, CA, USA

    Anastasia Mavridou & Andreas Katis

  2. NASA Ames Research Center, Moffett Field, CA, USA

    Dimitra Giannakopoulou & Thomas Pressburger

  3. University of California, Santa Cruz, CA, USA

    David Kooi

  4. University of Minnesota, Minneapolis, MN, USA

    Michael W. Whalen

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  1. Anastasia Mavridou
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  2. Andreas Katis
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  3. Dimitra Giannakopoulou
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  4. David Kooi
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  5. Thomas Pressburger
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  6. Michael W. Whalen
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Correspondence to Anastasia Mavridou .

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Editors and Affiliations

  1. University of Twente, Enschede, The Netherlands

    Marieke Huisman

  2. NASA Ames Research Center, Moffett Field, CA, USA

    Corina Păsăreanu

  3. Institute of Software, Chinese Academy of Sciences, Beijing, China

    Naijun Zhan

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Mavridou, A., Katis, A., Giannakopoulou, D., Kooi, D., Pressburger, T., Whalen, M.W. (2021). From Partial to Global Assume-Guarantee Contracts: Compositional Realizability Analysis in FRET. In: Huisman, M., Păsăreanu, C., Zhan, N. (eds) Formal Methods. FM 2021. Lecture Notes in Computer Science(), vol 13047. Springer, Cham. https://doi.org/10.1007/978-3-030-90870-6_27

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