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 past due 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 crew begun theproject of writing a compiler for that language. We had objectives in brain : to make major learn within the box of compiler technique, to show the specified problems encountered within the layout of the compilerand therefore very likely impression the definition of the language.This booklet is worried with the 1st objective in basic terms ; ALGOL sixty eight might be considereda aid to give an explanation for and enhance compiling rules and techniques.The complete ebook is at once in keeping with the particular compiler we now have written for theElectrologica-X8 machine ; this compiler has been operational considering early 1973oSince might 1975, it really is on hand at the ''BS-com~uter'', the Philips prototype developedby MBLE and that is on the starting place of the UNIDATA 7720. in truth, the X8 has be~nmicroprogra~ed at the BS ; it really is beneficial to say that microprogrammingdid now not introduce any major loss in potency.

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Cancel the protection. appears : 52 If during the machine code generation it appears that between the setting up of the protection and its cancelling, the garbage collector can never be called, the protection and the corresponding cancelling may be ignored. Remark 3. Suppose we have to translate an action with a number of parameters stored on WOST% and protected via GCWOST% and suppose the result of the action is a value which has to be stored on WOST~ and also to be protected. There are seversA strate~ e s allowing to construct the result on WOST$ while controlling the protection of WOST% values, in order to avoid the destruction of HEAP% values accessible through the result of the action : I) The protection management may be taken in charge by the routine translating the action.

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. However, (fi~. 17), if the value V were originated from an identifier which is only sliced ( k i n ~ = i ~ n and ~ r e f o = O) the access class of V would be dirwost' but Vd would not be on the HEAP%.

During the copy fi~. 2. 3 VALIDITY OF ACCESSES The validity of an access to a stored value is based on the following principle: a stored value may be used as the result of an action as long as this stored value is not overwritten. There are three run-time actions by which stored values can be lost : - the end of a block, - - the call of the garbage collector, the assignation. a. 1). eft~ assuming that scope rules (T) have been performed, cess remains valid. the ac- Clearly, when the access class is dirwost, indwost or diznoost', a run-time action is implied, by which the result of the block left is transmitted to the calling block, and the specification field of the access must be modified accordingly.

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