By David C. Luckham, Friedrich W. von Henke, Bernd Krieg-Brueckner, Olaf Owe
This reference guide of ANNA is one other quantity addressed to the ADA group. ANNA is a language extension of ADA to incorporate amenities for officially specifying the meant habit of ADA courses. it truly is designed to satisfy a perceived have to increase ADA with targeted machine-processable annotations in order that good validated formal tools of specification and documentation may be utilized to ADA courses. the present ANNA layout comprises annotations of all ADA constructs other than tasking. comparable extensions for formal specification will be made to different Algol-like languages resembling Pascal, PL/1, Concurrent Pascal, and Modula; basically, those extensions will be subsets of ANNA. The layout of ANNA used to be undertaken from the start with 4 valuable issues: 1. developing annotations may be effortless for the ADA programmer and will count up to attainable on notation and ideas of ADA. 2. ANNA may still own language gains which are familiar within the specification and documentation of courses. three. ANNA may still offer a framework during which a few of the demonstrated theories of officially specifying courses could be utilized to ADA. four. Annotations may be both compatible for various attainable purposes throughout the existence cycle of a software. Such purposes contain not just checking out, debugging and formal verification of a complete application, but in addition specification of software elements through the prior levels of necessities research and software design.
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Extra resources for ANNA A Language for Annotating Ada Programs
In the one dimensional case: I I = ~= J --* AEI => E ] ( J ) J --~ A [ I => E l ( J ) = E, = A(J) This axiom expressesthat the rightmost store operation gives the current value of a component. The semantics of array states implies that A[O; P] = A[O][P] where O, P are sequences of array store operations. Array states denote values. They are not variable names and consequently may not appear on the left side of an assignment, nor as an out parameter of a procedure call. 7 ANNOTATIONS OF RECORD TYPES New names are introduced for states of record objects in annotations.
A non-Scalar program variable is defined. A collection state is defined after elaboration of the access type; the current state of a package is defined after elaboration of the package body. 13 MODIFIERS 52 ANNA REFERENCE MANUAL 5. An indexed component is defined if all index expressions are defined and satisfy any Ada or Anna constraint on the index types, and the object it denotes is defined according to these rules. 6. e. X isin C is true, and the designated object is defined according to these rules.
Sions may appear inside an expression modified by out. Modifiers may not be applied to les. g. , the value of V in the initial state, and an initial expression, in (E) denotes the initial value of the (compound) expression E. Similarly, o u t E denotes the final value of a primary E. 2). The effect of the modifier in on the meaning of expressions in annotations is made precise by the rules for elaboration of annotations. Annotations are elaborated upon entry to their scope. During elaboration, every occurrence of in V in an annotation is replaced by the value of V on entry to the scope.