Candle: A Verified Implementation of HOL Light

Authors
Abrahamsson, Oskar 
Myreen, Magnus O 
Kumar, Ramana 

Loading...
Thumbnail Image
Type
Conference Object
Change log
Abstract

This paper presents a fully verified interactive theorem prover for higher-order logic, more specifically: a fully verified clone of HOL Light. Our verification proof of this new system results in an end-to-end correctness theorem that guarantees the soundness of the entire system down to the machine code that executes at runtime. Our theorem states that every exported fact produced by this machine-code program is valid in higher-order logic. Our implementation consists of a read-eval-print loop (REPL) that executes the CakeML compiler internally. Throughout this work, we have strived to make the REPL of the new system provide a user experience as close to HOL Light’s as possible. To this end, we have, e.g., made the new system parse the same variant of OCaml syntax as HOL Light. All of the work described in this paper has been carried out in the HOL4 theorem prover.

Publication Date
2022-08-03
Online Publication Date
Acceptance Date
2022-03-30
Keywords
Journal Title
13th International Conference on Interactive Theorem Proving (ITP 2022)
Journal ISSN
1868-8969
Volume Title
Publisher
Schloss Dagstuhl -- Leibniz-Zentrum fur Informatik