By Yamine Ait Ameur, Klaus-Dieter Schewe
This booklet constitutes the completely refereed complaints of the 4th foreign convention on summary country Machines, B, TLA, VDM and Z, which came about in Toulouse, France, in June 2014. The thirteen complete papers provided 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 similar state-based and machine-based formal equipment: summary kingdom Machines (ASM), Alloy, B, TLA, VDM and Z. They proportion a standard conceptual starting place and are general in either academia and for the layout and research of and software program platforms. the most aim of this convention sequence is to give a contribution to the combination of those formal tools, clarifying their commonalities and variations to higher know how to mix diverse ways for achieving some of the projects in modeling, experimental validation and mathematical verification of trustworthy top of the range hardware/software systems.
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Extra info for Abstract State Machines, Alloy, B, TLA, VDM, and Z: 4th International Conference, ABZ 2014, Toulouse, France, June 2-6, 2014. Proceedings
Example text
Newcombe have found that model checking dramatically beats proof, as model checking gives high confidence with reasonable effort. In addition to model checking we occasionally use informal proof, and are keen to try informal hierarchical proof [23]. We do have one or two algorithms that are so critical that they justify verification by formal proof (for which we are investigating the TLA+ proof system). But we doubt that we would use incremental formal proof as a design technique even for those algorithms.
VCC allows the user to write “ghost code” in a superset of the C programming language. This is an extremely powerful feature, but the result is usually significantly more verbose than when using TLA+ or Alloy. We have not investigated the extensibility or abstraction features of other methods. 4 Verification Tools That Can Handle Complex Concurrent and Distributed Systems The TLA+ model-checker works by explicitly enumerating reachable states. It can handle large state-spaces at reasonable throughput.
For example, the abstract log as specified in LogFS is actually encoded in the headers of nodes in UBIFS. It proved beneficial that we have initially started with the core concepts of the UBIFS file system and derived an abstract model [39]. This model has served as an anchor-point to incrementally develop the rest of the model hierarchy. Our experience is that models tend to change frequently. One reason for that is that requirements are clarified or assumptions are rectified. g. maintain a new invariant.