Protocols Apis

An Optimized Translation Process and Its Application to by Paul Branquart, Jean-Pierre Cardinael, Johan Lewi, Jean-Paul

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

Within the overdue sixties, the definition of ALGOL sixty eight I eleven , for a very long time calledALGOL X, reached a few balance. it truly is at that interval (1967) our group began theproject of writing a compiler for that language. We had objectives in brain : to make major study within the box of compiler method, to show the targeted problems encountered within the layout of the compilerand therefore in all probability effect the definition of the language.This publication is anxious with the 1st target merely ; ALGOL sixty eight might be considereda help to give an explanation for and strengthen compiling ideas and techniques.The complete booklet is at once in keeping with the particular compiler we've written for theElectrologica-X8 computing device ; this compiler has been operational due to the fact early 1973oSince may well 1975, it truly is to be had at the ''BS-com~uter'', the Philips prototype developedby MBLE and that is on the beginning of the UNIDATA 7720. in reality, the X8 has be~nmicroprogra~ed at the BS ; it really is necessary to say that microprogrammingdid now not introduce any major loss in potency.

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Extra info for An Optimized Translation Process and Its Application to ALGOL 68

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4 Source program : x := (d ] a I r a 2) + c Result of the syntactic analysis Cd t al 1 % ) :--x+ Intermediate code (without jump no : c storere~ and ,,Ioadre~ instructions) : ((diriden d) , L) copy (int, (diriden al) , (di~ost w) ) (L') L : copy (int, (diriden a2), (dirwost w)) L' : + (proc(int__,int)int, (dirwost w), (diriden c), (dirwost Wl)) := (int, (variden x), (dirwost Wl)) {in this intermediate code the instructions "copy" are intended to force the value of the first operand of the operator "+" in the same location w whatever the boolean value of d would be.

Moreover, when stored in a BLOCK%, supposing the static part of the value consists of several elements with a dynamic part (the whole of these dynamic parts forming the dynamic part of the value), these last ones must be stored in the same order as the corresponding descriptors in the static part of the value. This rule is intended to make copies of values easier. sult of BLOCK%. has an access class diriden Suppose for example the re- which is originated from variden. Suppo- se also that the value referred to by the name of the variable has several elements of mode []~, the ones being flexible the others not.

Suppose moreover that the result of the action does not preexist in memory and hence has to be construted on SWOST% Generally speaking, it is impossible to construct the result of the action directly on SWOSY$ by overwriting the values of the parameters and this for two reasons : (]) the whole of all parameters may be needed up to the end of the action~ (2) heap vS/ues accessible through parameters may remain accessible through the result. If such heap values are protected through garbage collection information associated with the parameters, the value of the parameter must remain available for the garbage collector up to the end of the action, Where the result itself will be associated with a garbage collection information.

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