The Rust programming language continues to rise in popularity, and as such, warrants the close attention of the programming languages community. In this work, we present a new foundational contribution towards the theoretical understanding of Rust\u2019s semantics. We prove that LLBC, a high-level, borrow-centric model previously proposed for Rust\u2019s semantics and execution, is sound with regards to a low-level pointer-based language \u00e0 la CompCert. Specifically, we prove the following: that LLBC is a correct view over a traditional model of execution; that LLBC\u2019s symbolic semantics are a correct abstraction of LLBC programs; and that LLBC\u2019s symbolic semantics act as a borrow-checker for LLBC, i.e. that symbolically-checked LLBC programs do not get stuck when executed on a heap-and-addresses model of execution.
\nTo prove these results, we introduce a new proof style that considerably simplifies our proofs of simulation, which relies on a notion of hybrid states. Equipped with this reasoning framework, we show that a new addition to LLBC\u2019s symbolic semantics, namely a join operation, preserves the abstraction and borrow-checking properties. This in turn allows us to add support for loops to the Aeneas framework; we show, using a series of examples and case studies, that this unlocks new expressive power for Aeneas.<\/p>\n","protected":false},"excerpt":{"rendered":"
The Rust programming language continues to rise in popularity, and as such, warrants the close attention of the programming languages community. In this work, we present a new foundational contribution towards the theoretical understanding of Rust\u2019s semantics. We prove that LLBC, a high-level, borrow-centric model previously proposed for Rust\u2019s semantics and execution, is sound with 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