Transformation of Applicative Specifications into Imperative ...

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CHAPTER 13. CONCLUSION RSL AST and the transformer. The conclusion is that the aims of the project have been fulfilled. 13.2 Discussion of the Result The transformer can perform a single step in a software development process as demonstrated in Chapter 10. This step is somewhat intuitive and easy to do. The problem is that the correctness of this step cannot be verified as all the other steps in the development process can by using the refinement relation. The contribution of this project is that some concrete and correct transformation rules are put up that applied to an applicative RSL specification gives an imperative RSL specification. By using the transformation rules the verification of this development step from applicative to imperative specification is superfluous, on the assumption that the transformation rules or correct and can be verified. Furthermore, a tool implementing the transformation rules has been constructed such that the development from applicative to imperative specification can be automated. This means that the work required in the development step from applicative to imperative specification is minimized and that it is assured that the transformation rules are applied correctly. The conclusion is that the contribution of the transformer is: 1. that the correctness of the entire development process from initial to final specification can be verified. 2. that the development step from applicative to imperative specification is automated. The result of the transformation using the transformer is readable and recognizable. This means that the further development of the imperative specification is not made more difficult compared to the further development of a hand made imperative specification. 13.3 Related Work This project is not the only work in which transformations from applicative specifications or programs into imperative counterparts are considered. Transformation from applicative RSL specifications into imperative RSL specifications is considered in [Gro95]. This work served as inspiration during the initial phase of this project, but it became obvious that the conditions for transformability, in [Gro95] named linearity, were far too strict, resulting in a much smaller subset of RSL to be transformable. 130
13.4. CONCLUDING REMARKS Translation from applicative code into imperative code has been considered before. The reason is that assembly code is imperative. This means that when compiling applicative programming languages such as Scheme, SML and some parts of Lisp transformation from applicative program into imperative assembly code is necessary. Many of the techniques used when compiling applicative programs cannot be exploited when developing transformation rules for this project as assembly code and RSL specifications are very different. But a few techniques can. This includes techniques for removing recursions, techniques that can be applied if extending the transformer to cover a greater part of the transformation from applicative RSL specification into imperative RSL specification. One of these techniques is the use continuations as described in [Wan80]. The drawback of using continuations compared to e.g. loops is a lack of clearness in most cases. The work described in [Lin04] and [LH04] considers the possibility of translating specifications written within a the mRSL subset of RSL and proof obligations into higher-order logic (HOL) specifications and proof obligations in order to be able to use the generic proof assistant Isabelle. In this way the the proof support for the RAISE Development Method could be improved. The project is primarily theoretical and defines among other things an institution for mRSL as mentioned in Chapter 7. The results of the related work are used to the extend possible, but as much of the work of this project never has been done before, it has been done without the possibility of support from related work. 13.4 Concluding Remarks This project has been an instructive experience for me. First of all I have had the opportunity to try my strength against theoretical work, which have been both challenging and fun. Furthermore, the project has given me a better understanding of language processors and translation. Last but not least, by working a lot with RSL and the RAISE method I have gained a lot of experience in these – an experience I hope to be able to utilize when entering the labour markets. It is my belief that the use of formal methods will increase in the years to come due to two facts. First of all the amount of safety critical systems will increase and at the same time the formal methods will be improved as more and more tools will be developed. My hope is, that this project and the resulting transformer will have a positive influence on this development. 131
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Transformation of Applicative Speci
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Resumé RAISE udviklingsmetoden er
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CONTENTS 6.4.3 Transforming Value E
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CONTENTS 12.2.4 Interactive Transfo
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LIST OF FIGURES xvi
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CHAPTER 1. INTRODUCTION This stepwi
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CHAPTER 1. INTRODUCTION 1. Formulat
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CHAPTER 3. TERMINOLOGY Example 3.5
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CHAPTER 4. CONSTRAINTS of interest.
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CHAPTER 8. SPECIFICATIONS The rewri
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Page 150 and 151: BIBLIOGRAPHY [ST02] Donald Sannello
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APPENDIX D. SPECIFICATION OF TRANSF
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APPENDIX E. ANTLR GRAMMAR END = "en
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APPENDIX G. TEST RESULTS continued
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