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1 results

  • Cogent: uniqueness types and certifying compilation

  • Part of
  • LIAM O’CONNOR, ZILIN CHEN, CHRISTINE RIZKALLAH, VINCENT JACKSON, SIDNEY AMANI, GERWIN KLEIN, TOBY MURRAY, THOMAS SEWELL, GABRIELE KELLER
  • Journal:
    Journal of Functional Programming / Volume 31 / 2021
    Published online by Cambridge University Press:
    27 October 2021, e25
    • Article
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  • This paper presents a framework aimed at significantly reducing the cost of proving functional correctness for low-level operating systems components. The framework is designed around a new functional programming language, Cogent. A central aspect of the language is its uniqueness type system, which eliminates the need for a trusted runtime or garbage collector while still guaranteeing memory safety, a crucial property for safety and security. Moreover, it allows us to assign two semantics to the language: The first semantics is imperative, suitable for efficient C code generation, and the second is purely functional, providing a user-friendly interface for equational reasoning and verification of higher-level correctness properties. The refinement theorem connecting the two semantics allows the compiler to produce a proof via translation validation certifying the correctness of the generated C code with respect to the semantics of the Cogent source program. We have demonstrated the effectiveness of our framework for implementation and for verification through two file system implementations.