FME 2001: Formal Methods for Increasing Software by Daniel Jackson (auth.), José Nuno Oliveira, Pamela Zave

By Daniel Jackson (auth.), José Nuno Oliveira, Pamela Zave (eds.)

FME 2001 is the 10th in a sequence of conferences prepared each eighteen months by way of Formal equipment Europe (FME), an self reliant organization whose goal is to stimulate using, and examine on, formal tools for software program improvement. It follows 4 VDM Europe Symposia, 4 different Formal tools Europe S- posia, and the 1999 global Congress on Formal tools within the improvement of Computing platforms. those conferences were significantly profitable in bringing - gether a group of clients, researchers, and builders of exact mathematical equipment for software program improvement. FME 2001 happened in Berlin, Germany and was once geared up by means of the C- puter technological know-how division of the Humboldt-Universit¨at zu Berlin. The subject matter of the symposium was once Formal tools for expanding software program productiveness. This topic acknowledges that formal equipment have the aptitude to do extra for commercial software program improvement than improve software program caliber { they could additionally elevate productiveness at many di erent issues within the software program life-cycle. the significance of the subject is borne out through the numerous contributed papers displaying how formal tools could make software program improvement extra e cient. there's an emphasis on instruments that nd error instantly, or with fairly little human e ort. there's additionally an emphasis at the use of formal easy methods to help with severe, labor-intensive initiatives reminiscent of software layout and test-case generation.

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That information is not only useful as a documentation for users of the Eiffel Base Libraries, but it also is indispensable for a machine assisted analysis of the library. 28 4 S. Helke and T. Santen Representation of Class Specifications in Isabelle/HOL Since our aim is to come up with tool support for reasoning about class specifications, we must map the Object-Z-like specifications of classes to a logical formalism for which a proof tool exists. To this end, we use Isabelle/HOL, the implementation of higher-order logic (HOL) in the generic theorem prover Isabelle [12].

The history constraint relates only states satisfying the state invariant. 4. Each operation schema specifying a method of the class relates only states satisfying the invariant, and it respects the history constraint. f. Figure 4). For example, it is understood that the methods of a class implicitly refer to the properties of its state schema and constant declarations. The logical representation, however, must make these conditions explicit, because much of the theory about classes derived in Isabelle/HOL relies on them.

In contrast to c, which is not accessible from outside of the class, the state components below the keyword visible are externally visible attributes. Visible state components are a notational abbreviation for methods returning values that depend only on the internal state of an object, so-called observer methods. The predicate below the horizontal line of the state schema is the state invariant. It describes the relationship between the state components of valid objects. The schema INIT describes the valid initial states of objects: the container c is initially empty, and, because the state invariant is implicitly required by INIT, empty = true and lin rep = .

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