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

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's at that interval (1967) our staff all started theproject of writing a compiler for that language. We had ambitions in brain : to make major examine within the box of compiler method, to indicate the specified problems encountered within the layout of the compilerand hence most likely impression the definition of the language.This publication is worried with the 1st objective merely ; ALGOL sixty eight can be considereda aid to give an explanation for and enhance compiling rules and techniques.The entire ebook is at once according to the particular compiler we have now written for theElectrologica-X8 machine ; this compiler has been operational when you consider that early 1973oSince could 1975, it really is to be had at the ''BS-com~uter'', the Philips prototype developedby MBLE and that's on the beginning of the UNIDATA 7720. actually, the X8 has be~nmicroprogra~ed at the BS ; it truly is valuable to say that microprogrammingdid now not introduce any major loss in potency.

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5) cells in memory. g. from As a a structure display, ; in other words, this means that a composed value is never represented by several static accesses to its elements. b. p) pointing to WOST%. 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).

P) 51 Remark I. Local optimization may cause a value, considered to be Stored on intermediate appear in a register protected, WOST%in the code, never to be actually stored at run-time on this stack but only to ; theoretically, the protection WOST% value, a name for example~ is if such a should take the local optimization tect the name in the register and not on tions into account is of no consequence WOST%. e. pro- is not called before GCWOST%. If the latter condition is it is always possible to inhibit the local optimization by the genera- tion of a special object instruction between the copy of the name and its use.

Such HS addresses of instances of routines are used by the garbage collector to take accessible retained blocks into account (fig. 26). 2 . 5 DYNAMIC CHECI£S The language ALGOL 68 requires a number of checks ensuring program security. These checks impose a steady control of stored values avoiding wrong interpretations of the contents of the memory, in particular of pointers. Such misinterpretations could have disastrous effects on : (I) the eXecution of compiled programs to the point of overwriting important data and perhaps the system itself.

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