Which of My Assumptions are Unnecessary for Realizability and Why Should I Care?

Rafi Shalom, Shahar Maoz

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Specifications for reactive systems synthesis consist of assumptions and guarantees. However, some specifications may include unnecessary assumptions, i.e., assumptions that are not necessary for realizability. While the controllers that are synthesized from such specifications are correct, they are also inflexible and fragile; their executions will satisfy the specification's guarantees in only very specific environments. In this work we show how to detect unnecessary assumptions, and to transform any realizable specification into a corresponding realizable core specification, one that includes the same guarantees but no unnecessary assumptions. We do this by computing an assumptions core, a locally minimal subset of assumptions that suffices for realizability. Controllers that are synthesized from a core specification are not only correct but, importantly, more general; their executions will satisfy the specification's guarantees in more environments. We implemented our ideas in the Spectra synthesis environment, and evaluated their impact over different benchmarks from the literature. The evaluation provides evidence for the motivation and significance of our work, by showing (1) that unnecessary assumptions are highly prevalent, (2) that in almost all cases the fully-automated removal of unnecessary assumptions pays off in total synthesis time, and (3) that core specifications induce more general controllers whose reachable state space is larger but whose representation more memory efficient.

Original languageEnglish
Title of host publicationProceedings - 2023 IEEE/ACM 45th International Conference on Software Engineering, ICSE 2023
PublisherIEEE Computer Society
Pages221-232
Number of pages12
ISBN (Electronic)9781665457019
DOIs
StatePublished - 2023
Event45th IEEE/ACM International Conference on Software Engineering, ICSE 2023 - Melbourne, Australia
Duration: 15 May 202316 May 2023

Publication series

NameProceedings - International Conference on Software Engineering
ISSN (Print)0270-5257

Conference

Conference45th IEEE/ACM International Conference on Software Engineering, ICSE 2023
Country/TerritoryAustralia
CityMelbourne
Period15/05/2316/05/23

Funding

FundersFunder number
European Union s Horizon Europe research and innovation programme
European Union’s Horizon Europe research and innovation programme101069165
European Research Council

    Keywords

    • Formal specifications
    • Reactive synthesis

    Fingerprint

    Dive into the research topics of 'Which of My Assumptions are Unnecessary for Realizability and Why Should I Care?'. Together they form a unique fingerprint.

    Cite this