Un système de types pragmatique pour la vérification déductive des programmes

Abstract : This thesis is conducted in the framework of deductive software verification.is aims to formalize some concepts that are implemented in the verification tool Why3. The main idea is to explore solutions that a type system based approach can bring to deductive verification. First, we focus our attention on the notion of ghost code, a technique that is used in most of modern verification tools and which consists in giving to some parts of specification the appearance of operational code. Using ghost code correctly requires various precautions since the ghost code must never interfere with the operational code. The first chapter presents a type system with effects illustrating how ghost code can be used in a way which is both correct and expressive. The second chapter addresses some questions related to verification of programs with pointers in the presence of aliasing, i.e. when several pointers handled by a program denote a same memory cell. Rather than moving towards to approaches that address the problem in all its complexity to the costs of abandoning the framework of Hoare logic, we present a type system with effects and singleton regions which resolves a liasing issues by performing a static control of aliases even before the proof obligations are generated. Although our system is limited to pointers whose identity must be known statically, we observe that it fits for most of the code we want to verify. Finally, we focus our attention on a situation where there exists an abstraction barrier between the user's code and the one of the libraries which it depends on. That means that libraries provide the user a set of functions and of data structures, without revealing details of their implementation. When programs are developed in a such modular way, verification must be modular it self. It means that the verification of user's code must take into account only function contracts supplied by libraries while the verification of libraries must ensure that their implementations refine correctly the exposed entities. The third chapter extends the system presented in the previous chapter with these concepts of modularity and data refinement.
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Léon Gondelman. Un système de types pragmatique pour la vérification déductive des programmes. Logique en informatique [cs.LO]. Université Paris-Saclay, 2016. Français. ⟨NNT : 2016SACLS583⟩. ⟨tel-01533090v2⟩

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