By Robert F. Stärk
The beginning of this booklet is going again to the Dagstuhl seminar on common sense for method Engineering, geared up in the course of the first week of March 1997 by way of S. Jiihnichen, J. Loeckx, and M. Wirsing. in the course of that seminar, after Egon Borger's speak on tips to Use summary kingdom Machines in software program Engineering, Wolfram Schulte, on the time a learn assistant on the college of Ulm, Germany, puzzled no matter if ASMs supply something precise as a scientifically good based and rigorous but basic and industrially possible framework for top point layout and research of advanced structures, and for usual refinements of versions to executable code. Wolfram Schulte argued, bearing on his paintings with ok. Achatz on a proper Object-Oriented procedure encouraged by way of Fusion and Object-Z [1], that with present innovations of sensible programming and of axiomatic specification, you can in achieving a similar consequence. a thorough and lengthy debate arose from this dialogue. on the finish of the week, it led Egon Borger to suggest a collaboration on a real-life specification venture of Wolfram Schulte's selection, as a comparative box attempt of basically sensible declarative tools and in their enhancement inside of an built-in summary state-based operational (ASM) technique. After a few hesitation, in may well 1997 Wolfram Schulte authorised the provide and selected because the subject a high-level specification of Java and of the Java digital laptop.
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Extra info for Java and the Java Virtual Machine Definition, Verification, Validation; Robert Stark, Joachim Schmid, Egon Borger
Sample text
If A h B and B h h h is a partial ordering: C , then A h C . A, then A = B . The relation h restricted to classes is a finite tree. The root of the tree is the class Object. In mathematical terms, this can be expressed as follows. 2. Let A, B and C be classes. Then we have: 1. A h Object (every class is a subclass of Object). 2. If A ≺d B and A ≺d C , then B = C . 3. If A h B and A h C , then B h C or C h B . Not much can be said with respect to interfaces except that interfaces have no superclasses but only superinterfaces.
If the declared return type A is different from void, then each execution path of body must be terminated with a statement ‘return exp;’ (see also Sect. 2). 7. If the declared return type A is void, then each execution path of body must be terminated by the statement ‘return;’. ) 8. The method msig is declared at most once in C . 9. The method is abstract if, and only if, its body is the semicolon. 10. If C /msig is abstract, then C is abstract. 11. If C /msig is private, final or static, then it is not abstract.
In this way it is ensured that during run-time a variable of declared primitive type A always holds a value of type A. 5 contains the additional type constraints which the abstract syntax tree must satisfy after parsing and elaboration. 38 3. 5 Type constraints after introduction of primitive type casts α (loc = β e) α β ( e 0 ? γ e1 : δ e2 ) Let A be the declared type of loc. If A is a primitive type, then T (β) = A = T (α). If T (γ) and T (δ) are primitive types, then T (γ) = T (δ) = T (α). 3 Vocabulary of JavaI The input program body, an annotated abstract syntax tree, is the initial value of the to be computed term restbody, a dynamic function which contains a) the still to be executed part of the current program (method body), b) the already computed and still needed expression values, and c) information about the current abruption or the successful termination of the computation.