By Peter D. Mosses
Motion Semantics is a singular method of the formal description of programming languages. Its abstractness is at an intermediate point, among that of denotational and operational semantics. motion Semantics has enormous pragmatic merits over all past ways, in its comprehensibility and accessibility, and particularly within the usefulness of its semantic descriptions of reasonable programming languages. during this quantity, Dr Peter Mosses offers a radical creation to motion semantics, and gives huge illustrations of its use. Graduates of desktop technological know-how or maths who've an curiosity within the semantics of programming languages will locate motion Semantics a such a lot priceless publication.
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Extra resources for Action Semantics
The main virtue of this example is that it nicely demonstrates the use of the formal notation that we use in action semantic descriptions, without the distracting (and sometimes tedious) details that arise when describing the semantics of realistic programming languages. Moreover, the SIMPLE language is a familiar example to readers who have studied previous frameworks for semantic description, such as denotational semantics, and most programmers will be able to recognize it as a much-restricted version of some high-level programming language that they have used.
Clearly, the final result is independent of the order in which replacements are made. 3 Semantic Entities To complete our semantic description of SIMPLE programs, we have to specify the notation that is used in the semantic equations for expressing semantic entities. In fact the standard notation provided by action semantics already includes notation for all the actions we need, so we refer to the module that specifies the standard notation as shown below. includes: Action Notation. We use includes here so as to make the notation specified in the module Action Notation available not only in the current module, Semantic Entities, but also in the module that refers to it, Semantic Functions.
We may choose to specify a module gradually, by giving several incomplete specifications which, when combined, form the complete module. For clarity, the later specifications should explicitly indicate that a previous module with the same title is being continued. For instance, we may give an incomplete module that introduces some notation—and perhaps specifies its most essential properties—deferring the detailed definitions to an appendix where the module is completed. A similar effect could be achieved using extra submodules, but the accompanying specification of dependencies becomes a bit tedious on a large scale.