Formal Verification of an SSA-Based Middle-End for CompCert

Author:

Barthe Gilles1,Demange Delphine2,Pichardie David3

Affiliation:

1. IMDEA Software Institute

2. IRISA -- University of Rennes 1/Inria

3. IRISA -- ENS Rennes/Inria

Abstract

CompCert is a formally verified compiler that generates compact and efficient code for a large subset of the C language. However, CompCert foregoes using SSA, an intermediate representation employed by many compilers that enables writing simpler, faster optimizers. In fact, it has remained an open problem to verify formally an SSA-based compiler. We report on a formally verified, SSA-based middle-end for CompCert. In addition to providing a formally verified SSA-based middle-end, we address two problems raised by Leroy in [2009]: giving an intuitive formal semantics to SSA, and leveraging its global properties to reason locally about program optimizations.

Funder

FNRAE ASCERT

Bretagne Regional project CertLogS

Madrid Regional project

Spanish project

Agence Nationale de la Recherche

Publisher

Association for Computing Machinery (ACM)

Subject

Software

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2. Synthesizing Quantum-Circuit Optimizers;Proceedings of the ACM on Programming Languages;2023-06-06

3. Mechanised Semantics for Gated Static Single Assignment;Proceedings of the 12th ACM SIGPLAN International Conference on Certified Programs and Proofs;2023-01-11

4. SSA Translation Is an Abstract Interpretation;Proceedings of the ACM on Programming Languages;2023-01-09

5. Formally Verified Native Code Generation in an Effectful JIT: Turning the CompCert Backend into a Formally Verified JIT Compiler;Proceedings of the ACM on Programming Languages;2023-01-09

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