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 really is at that interval (1967) our staff 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 precise problems encountered within the layout of the compilerand therefore most likely effect the definition of the language.This e-book is anxious with the 1st aim simply ; ALGOL sixty eight can be considereda help to provide an explanation for and boost compiling ideas and techniques.The entire ebook is without delay according to the particular compiler we now have written for theElectrologica-X8 machine ; this compiler has been operational because early 1973oSince may possibly 1975, it truly is 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 really is useful to say that microprogrammingdid no longer introduce any major loss in potency.

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3) but in practice, wrong programs may have side-effects everywhere. 1). This is the reason why the WOST% protection described below does take even dis~ allowed side-effects into account. Suppose a HEAP% value Vh is protected through an IDST% value V, the protection may become obs61ete if some pointer linking V and Vh may be overwritten. This may happen if, according to the origin properties of V, an assignation may take place, by which pointers corresponding to names or to offsets of flexible descriptors involved in the link may be overwritten.

10 VS 1 Vd' Vd J 4O Remark 3 It has been explained in [ 13] haw the presence of local generators may hamper the last-in-first-out principle of WOST$, when LGST% and WOST% are marged in ~ N S T % . The solution of [ 13] implies an order of elaboration ; more precisely, it implies that "syntactically accessible" generators of collateral clauses are elaborated before the other elements of the clause. We propose here a solution implying no order of elaboration but by which we accept the freezing of some parts of DWOST$ i for the duration of BLOCK$ i.

B) the access class of the value is dir~ost', and according to its mode, the value contains a name N (fi@. 15). 12 (fig. 16) Suppose a value V (VS and Vd) with an access class di~ost' has the following origin properties - kindo =var - derefo = 1 - ~exo = I This means that the last dereferenced name was referring to a value with flexible bounds, and hence that the dynamic part of this value is stored on the HEAP$. As a consequence Vd is on the HEA~. g. J ~ is first dereferenced giving rise to a multiple value M(~ and bld) with flexible bounds and then sliced giving rise to V.

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