By Cesare Tinelli (auth.), Alwyn E. Goodloe, Suzette Person (eds.)
This booklet constitutes the refereed court cases of the Fourth foreign Symposium on NASA Formal equipment, NFM 2012, held in Norfolk, VA, united states, in April 2012. The 36 revised commonplace papers awarded including 10 brief papers, three invited talks have been conscientiously reviewed and chosen from ninety three submissions. the subjects are equipped in topical sections on theorem proving, symbolic execution, model-based engineering, real-time and stochastic structures, version checking, abstraction and abstraction refinement, compositional verification concepts, static and dynamic research ideas, fault safeguard, cyber defense, specification formalisms, necessities research and functions of formal techniques.
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Additional resources for NASA Formal Methods: 4th International Symposium, NFM 2012, Norfolk, VA, USA, April 3-5, 2012. Proceedings
In particular, it lacks in detecting all those runtime errors that might occur only with particular data sets, such as division by zero and buﬀer overﬂow. For this reason, translation validation has been completed with abstract interpretation by means of the Polyspace tool. The main feature of the tool is to detect runtime errors by performing static analysis of the code. Since the correctness of the source is not decidable at the program level, the tools implementing abstract interpretation work on a conservative and sound approximation of the variable values in terms of intervals, and consider the state space of the program at this level of abstraction.
Italics indicate partial adoption of a technology or partial achievement of a goal. 1 Goal 1 - Modelling Language Restriction The ﬁrst goal was to identify a proper subset of the Simulink/Stateﬂow language: the idea was that C code generated from models in this subset would be compliant with the guidelines deﬁned by the company in accordance with the quality standard required by the norms. With Project 1, this problem was addressed by ﬁrst analysing the violations of the quality standard issued by the code generated from the original model.
Then, functional unit-level veriﬁcation was performed by means of a two-phase task made of model-based testing  and abstract interpretation . The ﬁrst step checks for functional equivalence between model and code. The second step, supported by the Polyspace tool [10,25], is used to assess the absence of runtime errors. Due to the timing of the project, both guidelines veriﬁcation and model-based testing have been only partially employed. The process had to be adjusted with ad-hoc solutions, mostly based on traditional code testing, in order to address the problem of a non-certiﬁed code generator.
NASA Formal Methods: 4th International Symposium, NFM 2012, Norfolk, VA, USA, April 3-5, 2012. Proceedings by Cesare Tinelli (auth.), Alwyn E. Goodloe, Suzette Person (eds.)