By Manuel Clavel, Francisco Durán, Steven Eker, Patrick Lincoln, Narciso Martí-Oliet, José Meseguer, Carolyn Talcott
This booklet offers a entire account of Maude, a language and procedure in keeping with rewriting good judgment. Many examples are used in the course of the booklet to demonstrate the most principles and contours of Maude, and its many attainable makes use of. Maude modules are rewrite theories. Computation with such modules is - cient deduction by way of rewriting. as a result of its logical foundation and its preliminary version semantics,aMaudemodulede?nesaprecisemathematicalmodel.Thismeans that Maude and its formal software atmosphere can be utilized in 3, at the same time reinforcing methods: • as a declarative programming language; • as an executable formal speci?cation language; and • as a proper veri?cation method. Maude’s rewriting common sense is easy, but very expressive. this provides Maude solid representational services as a semantic framework to officially symbolize quite a lot of structures, together with types of concurrency, dispensed al- rithms, community protocols, semantics of programming languages, and versions of phone biology. Rewriting common sense can be an expressive common logic,making Maude a ?exible logical framework during which many di?erent logics and - ference structures should be represented and mechanized. This makes Maude an invaluable metatool to construct many different instruments, together with these in its personal formal instrument atmosphere. because of the logic’s simplicity and using complex semi-compilation thoughts, Maude has a high-performance implementation, making it aggressive with different declarative programming languages.
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Additional resources for All About Maude - A High-Performance Logical Framework: How to Specify, Program and Verify Systems in Rewriting Logic
4). This, together with the use of caching techniques, makes metalevel computations quite eﬃcient. A typical metalevel computation may perform millions of rewrites very efﬁciently at the object level, paying a cost (linear in the size of the term) in changes of representation from the metalevel to the object level and back only at the beginning and at the end of the computation. 2 The Logical Foundations of Maude The foundations of a house do not have to be inspected every day: one is grateful that they are there and are sound.
Thus, we can type the following, just after starting Maude: Maude> red "hello" + " " + "world" . reduce in CONVERSION : "hello" + " " + "world" . rewrites: 2 in 0ms cpu (0ms real) (~ rews/sec) result String: "hello world" Notice that Maude makes explicit the module in which the term is reduced, even when no module name is given by the user. 3 Getting Support and More Information 35 where hello-world is a text ﬁle in the current directory containing the module HELLO-WORLD. obj extensions. Maude can also be told using the MAUDE_LIB environment variable about other directories to use to search for ﬁles.
4). 7), giving the user the possibility of indicating which arguments to evaluate and in which order before simplifying a given operator with the equations. This can range from “no arguments” (a lazy strategy) to “all arguments” (an eager bottom-up strategy) to something in the middle (like evaluating the condition before simplifying an if-then-else expression). Evaluation strategies control the positions in which equations can be applied. But what about rules? 9) blocks rule rewriting anywhere in the subterms at those positions.