Transformation of Applicative Specifications into Imperative ...

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CHAPTER 2. GENERAL IDEA value increment : Unit → read t, s write t Unit increment() ≡ t := t + s end The problem occurs because it is necessary to distinguish between the type names of the types of interest and the actual types of the types of interest. This means that the type inference of the value expressions changes accordingly. A value expressions with type of interest T = type_expr is treated as a value expression of type T and not of type type_expr as the static inference of RSL normally prescribes. The type of a value expression is solely determined based on the single typing of the function definition in which the value expression is incorporated. This makes new demands on the specification style. It is very important that the types of interest are used with care in the applicative specification. They shall only be used in contexts where they are actually wanted. When it is necessary that only some occurrences of a type of interest should be transformed as types of interest, it is necessary to establish other type names with the same type as the type of interest. Then these new type names should be used whenever an expression should not be transformed as a type of interest. The problem could be avoided by making an interactive transformer in which the user interactively could decide which occurrences of the types of interest that should be transformed as such and which should be transformed as ordinary types. This solution is not implemented in this project. 12
Chapter 3 Terminology During the report certain syntax and terminology are used. These are defined in this chapter in order to give an overview and for quick reference during the reading. 3.1 Syntax The syntax applicative_specification ✄ imperative_specification is used to denote that the applicative_specification is transformed into the imperative_specification. The development step from applicative_specification to imperative_specification is correct in the sense that their exists a certain relation between the semantics of the two specifications as explained in Chapter 7. 3.2 Terms and Definitions A list of the terms used in the report together with their definitions are given below. Type of Interest When transforming an applicative specification into an imperative specification it has to be decided which types should be represented by variables. These types are called types of interest. The term, type of interest, is actually misleading as the types of interest refers to type names, not to the type expressions of these type names. The term originate from the literature, e.g. [Gro95]. A type of interest is during the report most often named T, and the corresponding variable is named t. 13
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CHAPTER 11. TEST 11.1.1 Lexer and P
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CHAPTER 11. TEST An overview of the
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CHAPTER 12. POSSIBLE EXTENSIONS OF
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CHAPTER 13. CONCLUSION RSL AST and
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BIBLIOGRAPHY [ST02] Donald Sannello
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APPENDIX A. USING AND EXTENDING THE
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APPENDIX B. CONTENTS OF CD-ROM 140
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APPENDIX D. SPECIFICATION OF TRANSF
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APPENDIX E. ANTLR GRAMMAR END = "en
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APPENDIX E. ANTLR GRAMMAR ; d = d e
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APPENDIX F. SOURCE CODE System . e
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APPENDIX G. TEST RESULTS continued
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