Software Development Environments and CASE Technology: by Henk Obbink (auth.), A. Endres, H. Weber (eds.)

By Henk Obbink (auth.), A. Endres, H. Weber (eds.)

Software improvement environments are built-in units of instruments, innovations and methods that help in the sys- tematic improvement of software program items. they're meant to help all levels of the software program improvement cycle: specifications definition, layout, implementation, try, and upkeep. those laptop Aided software program Engineering (CASE) instruments as a rule utilize picture manipulation amenities and depend on a few kind of improvement database to replace numerous forms of layout items among instruments. Facilitated through the provision of strong workstations, implementations of those applied sciences at the moment are close by of each software program developer. This quantity provides the court cases of a symposium geared up by way of the GI (Gesellschaft für Informatik), the GMD (Gesellschaft für Mathematik und Datenverarbeitung) and ESEC (European software program Engineering Conferences). The symposium introduced jointly program improvement managers and most sensible experts curious about the choice and advent of software program improvement instruments, major builders of such instruments and popular gurus from the examine neighborhood. The complaints comprise first-hand info on sensible reports and specifications, improvement instructions and methods, and key learn matters and results.

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Extra resources for Software Development Environments and CASE Technology: European Symposium Königswinter, June 17–19, 1991 Proceedings

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The method used is BIDOP. Memory is seg mente d into pages , each about l k words long. Each page contain s objects of one type only. To determine th e type of a pointer, one must determine th e type of the page to which it points. In general, this can be done by using a special ta ble (as in MacLisp) or by looking at a header word at the beginning of the page in quest ion. Array headers are allocated in t his way, and the array elements are placed elsewhere. Hunks are a short, vector-like data struct ure in MacLisp and are allocated using a buddy-block system.

However, th e PDP-lO code for TAK' shown above demonstrates that it is using PDL numbe rs. Also, by tim ing various values for n , one can see that th ere is no significant variation and th at th e coding technique th erefore canno t be number-size dependent (up to BIGNUMs). 2 Measure the Right Thing Often a single operation is too fast to time dir ectly, and therefore must be performed many tim es; the total time is then used to compute the speed of th e operati on. Although simple loops to accomplish th is appear straight forward, the benchma rk may be ma inly testing the loop construct.

Function calling . and byte manipulation capab ilities; it also supports internal sta ck storage. The CADR derives much of its power from extensive microcoding. This is assisted by a 14-bit microprogram count er that, acting as a tradit ional processor} permits up to 16k words of dynami cally writable microprogram memory. Th ere is also a 32-locat ion microcode funct ion ret urn stack. Th e CADR has linear, paged virtual memory comprising 65,536 pages of 256 32-bit words. A two-level memory map t ranslates each virt ual address of 24 bits into a Z2-bit physical add ress.

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