Formal Verification of Compiler Transformations for Speculative Real-Time Execution

Authors:
Mohamed F. Younis;Grace Tsai;Thomas J. Marlowe;Alexander D. Stoyen
Affiliations:
AlliedSignal Inc., Advanced Systems Technology Group, Columbia, MD21044, USA;Fairleigh Dickinson University, Department of Computer Science, Teaneck, NJ 07666, USA;Seton Hall University, Department of Mathematics and Computer Science, South Orange, NJ 07079, USA;New Jersey Institute of Technology, Department of Computer and Information Science, Real-Time Computing Laboratory, Newark, NJ, USA
Venue:
Automatica (Journal of IFAC)
Year:
1998

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Abstract

There have been a number of successes in the past few years in use of formal methods for verification of real-time systems, and also in source-to-source transformation of these systems for improved analysis, performance, and schedulability. What has been lacking are formal proofs that these transformations preserve, or establish program properties. We have previously developed a set of compiler transformation rules for safe and profitable speculative execution in real-time systems. In this paper, we present formal proofs that our transformations preserve both the semantic and the timeliness properties of programs. Our approach uses temporal logic, enhanced with a denotational-semantics-like representation of program stores. While the paper focuses on the speculative execution transformations, the approach is applicable to other real-time compiler-based transformations and code optimization.