By Egon Börger, Robert Stärk
Quelli che s'innamoran di pratica senza scienzia sono come 'l nocchieri ch'entra in navilio sanza timone o bussola, 1 che mai ha certezza dove si vada. - Leonardo da Vinci Ich habe oft bemerkt, dass wir uns durch
allzuvieles Symbolisieren 2 die Sprache fu ¨r die Wirklichkeit untu ¨chtig machen. - Christian Morgenstern this can be where to specific our thank you. to start with we thank all those that through the years have actively contributed
to shaping the unconventional software program layout and research approach defined during this e-book. they're too quite a few to be pointed out right here. all of them seem not directly or the opposite at the following pages, particularly within the bibliographical
and ancient Chap. nine which might be learn independently of the publication. We then thank those that have helped with unique severe reviews at the draft chapters to form the way in which our arguments are provided during this booklet: M. B¨
orger (Diron Mu ¨nster), I. Craggs (IBMHursley),G. DelCastillo(SiemensMunc ¨ hen),U. Gl¨ asser(SimonFraser college, Vancouver,Canada),J. Huggins(Kettering University,Michigan, USA), B. Koblinger (IBM Heidelberg), P. Pa
¨ppinghaus (Siemens Munc ¨ hen), A. Preller (Universit´ e de Montpellier, France), M. -L. Potet (INP de Gre- ble, France),W. Reisig (Humboldt-Universit¨ at zu Berlin, Germany),H. Rust (Universit¨ at Cottbus, Germany), G.
Schellhorn (Universit¨ at Augsburg, G- many), B. Thalheim (Universit¨ at Cottbus, Germany) and a dozen pupil generationsat Universita `di Pisa. We thankM. Barmet(ETH Zur ¨ ich)for her ideas of the routines in Chap. 8.
We additionally thank L.
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Extra resources for Abstract state machines..A method for high-level system design and analysis
The most common cases are those of diagrams with one or with two opposite conditions in the rhombs or hexagons (n = 1, 2); in the latter case usually the condition is written into the rhomb and the two exiting arcs are labeled with “yes” and “no”, respectively (Fig. 8), which are sometimes colored in grey to let them stand out better. As an example see the Switch(condi , ctli )i machine in Fig. 9, which under condition condi switches to control state ctli . When using graphical notation we allow ourselves sometimes some self-explaining variations of the layout, which can always be reduced to the official definition explained above.
This covers the extension of the traditional trace-based notion of abstraction function to abstraction relations, or equivalently adding to the refined model socalled history variables to keep track of the abstract state locations which have been optimized away. This covers the extension of the traditional trace-based notion of abstractions of type (1, 1) by so-called prophecy variables. For an illustrative example see the machine EarlyChoice and its implementation LateChoice on p. 116. 26 2 ASM Design and Analysis Method Fig.
31 The use of submachines and of macros supports the modularization and stepwise refinement of large machines. For purposes of separation of concerns it is often convenient to impose for a given ASM additional constraints on its runs to circumscribe those one wants to consider as legal. Logically speaking this means restricting the class of models satisfying the given specification (read: the design space). Such restrictions are particularly useful if the constraints express reasoning assumptions for a high-level machine which are easily shown to hold in a refined target machine.