By Yamine Ait Ameur, Klaus-Dieter Schewe
This e-book constitutes the completely refereed court cases of the 4th foreign convention on summary nation Machines, B, TLA, VDM and Z, which came about in Toulouse, France, in June 2014. The thirteen complete papers awarded including three invited talks and 19 brief papers have been rigorously reviewed and chosen from eighty one submissions. The ABZ convention sequence is devoted to the cross-fertilization of six comparable state-based and machine-based formal equipment: summary country Machines (ASM), Alloy, B, TLA, VDM and Z. They percentage a standard conceptual beginning and are common in either academia and for the layout and research of and software program platforms. the most objective of this convention sequence is to give a contribution to the combination of those formal tools, clarifying their commonalities and adjustments to higher know the way to mix varied techniques for attaining many of the projects in modeling, experimental validation and mathematical verification of trustworthy fine quality hardware/software systems.
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Additional resources for Abstract State Machines, Alloy, B, TLA, VDM, and Z: 4th International Conference, ABZ 2014, Toulouse, France, June 2-6, 2014. Proceedings
The book admits that this is “somewhat disturbing”. In Alloy, when S and T each represent a set of integers, the integer comparison operator performs an implicit summation but the equality operator does not. ) Alloy has a feature called ‘signature facts’ that we have found to be a source of confusion. The Alloy book [15, p. 122] says, “The implicit quantification in signature facts can have unexpected consequences”, and then gives an example that is described as “perhaps the most egregiously baffling”.
The TLA+ Toolbox contains a similar feature called Trace Explorer that can evaluate several arbitrary TLA+ expressions in every state of an execution trace and then display the results alongside each state. We found that this feature often helped us to diagnose subtle design errors. At the time of writing, Trace Explorer still has some quirks: it is somewhat slow and clunky due to having to launch a separate short-lived instance of the model checker on every change, and the IDE sometimes does a poor job of managing screen space, which can cause a tedious amount of clicking, resizing, and scrolling of windows.
Furthermore, KIV supports replaying of an old, invalid proof. User interactions are therefore mostly limited to parts of a proof aﬀected by a change. Similar to , we observed that strong abstraction capabilities of the used tools are essential. KIV supports arbitrary user-deﬁned data types (given suitable axioms), which was for example exploited to abstract the pointer structure to an algebraic tree and to abstract the sparse pages of ﬁles to streams (see Sec. 2). We found that for smaller invariants it would be useful to have stronger typing support in our tool, such as for example predicative subtypes .
Abstract State Machines, Alloy, B, TLA, VDM, and Z: 4th International Conference, ABZ 2014, Toulouse, France, June 2-6, 2014. Proceedings by Yamine Ait Ameur, Klaus-Dieter Schewe