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By Paul Branquart, Jean-Pierre Cardinael, Johan Lewi, Jean-Paul Delescaille, Michael Vanbegin (auth.)

ISBN-10: 3540075453

ISBN-13: 9783540075455

Within the overdue sixties, the definition of ALGOL sixty eight I eleven , for a very long time calledALGOL X, reached a few balance. it really is at that interval (1967) our workforce all started theproject of writing a compiler for that language. We had pursuits in brain : to make major examine within the box of compiler technique, to indicate the detailed problems encountered within the layout of the compilerand hence probably effect the definition of the language.This booklet is anxious with the 1st aim simply ; ALGOL sixty eight could be considereda aid to give an explanation for and boost compiling rules and techniques.The complete ebook is at once according to the particular compiler we now have written for theElectrologica-X8 machine ; this compiler has been operational for the reason that early 1973oSince may perhaps 1975, it's on hand at the ''BS-com~uter'', the Philips prototype developedby MBLE and that's on the beginning of the UNIDATA 7720. in reality, the X8 has be~nmicroprogra~ed at the BS ; it's necessary to say that microprogrammingdid no longer introduce any major loss in potency.

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Additional resources for An Optimized Translation Process and Its Application to ALGOL 68

Example text

P'). p) and step 9, case B4). pr). 14). result will never be stored on SWOST%. p) and of mode NONROW. Theoretically, it would be sufficient to construct the descriptor of the result on SWOST%. In addition~ the present rule implies to copy the static part of the original value on DWOST%. e b3 : all offset pointers of WOST%values must point to the same direction (from appear in a well defined order which makes copies of values WOST%values always from WOST% to WOST% more efficient of the result of a pro- the bottom to the top of the stack).

6 about static memory recovery has been considered for the dynamic memory recovery. Such an example would be related to the trans- lation of an action with several parameters stored on WOST%, all corresponding stored on WOST$ and with a result to be values being supposed to have dynamic parts. 1 can be imagined here, for storing 38 [ml DMRWOST% r P nd" Pd CC3Z] [ DMRWOST% DWOST% [ SWOST% I DWOST% SWOST% // ranstpm%~__ ~ma_,. ~/ t , b. dynamic mode of U is [ ] U2 a. dynamic mode of U is Vl fig. p+~p-ohsz) Fdl ~__ ranstpm% fi~.

Loc struct ([l:2]in~t i, .... [1:2 ~lex]real r)). Exa_~2,1 (fi~. 2,1) Let S be a structured value with three fields is stored on SI~ST%i, the dynamic the one Fd2 of F 2 is ~I~ST%i, and BLOCK%i, ~ has to to supersede Fd3 parts Fdl Fd3 and F5 ; Ss (FsI,Fs2,Fs3) HEAP%. If S is the result of BLOCK%j. 3, Remark 3-3). Rule b5 : when a value is copied from WOST% to WOST% and when source and object va- lues may overlap, the source value is always stored at a lower WOST% address than the object value such that the value can be copied cell by cell in natural order.

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An Optimized Translation Process and Its Application to ALGOL 68 by Paul Branquart, Jean-Pierre Cardinael, Johan Lewi, Jean-Paul Delescaille, Michael Vanbegin (auth.)


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