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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 truly is at that interval (1967) our crew all started theproject of writing a compiler for that language. We had pursuits in brain : to make major learn within the box of compiler method, to show the specific problems encountered within the layout of the compilerand therefore potentially impact the definition of the language.This e-book is worried with the 1st objective basically ; ALGOL sixty eight will be considereda help to provide an explanation for and advance compiling rules and techniques.The complete e-book is at once according to the particular compiler we have now written for theElectrologica-X8 laptop ; this compiler has been operational due to the fact that early 1973oSince may possibly 1975, it truly is to be had at the ''BS-com~uter'', the Philips prototype developedby MBLE and that is on the starting place of the UNIDATA 7720. in reality, 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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Extra info for An Optimized Translation Process and Its Application to ALGOL 68

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53 BLOCK%i-I BLOCK%i_I GCWOST%i_ GCW~T%~I _____ SWaT%i_ I VS' I I I I I DWOST%i_I DWOST%i_I II I BLOCK%i GCWOSI%i Vd ' a. before exit from BLOCK%i b. after exit from #_i~. 25 BLOCK%i 54 ~roc P L F p:_- 31{bodyF of a routine where x is applied} (3) L 2, C~ L a. Nesting of blocks {I and 2 &re retained blocks} 0 0 p 2"" Ii......... stch% p 1' I' , stch% 2' stch% (1) (2) (3) b. 16~NST$ at the execution points (I), (2) and (3) flg. 26 55 - to call the garbage collection if there is not space enough, and to stop if this call does not free enough space.

3). 2 Source program : x:--a+b×c (%) In the revision [8] side-effects are no longer allowed. 28 Result of the s~T_tactic analysis : :--x+~xbc Intermediate code : × (~roc (int, int)int, (diriden b)j Cdiriden c), (dirwost w)) +( r~_~ (in~t int)in___tj (diriden a), (dirwost w), (dirwost Wl)) :; (int, (variden x), (dirwost wl)) Machine code without local optimization : LDA b ~v~y c STA w LDA w ADA a STA w 1 (When the second operand of a commutative dyadic operator is stored on WOST% the order of the two operands is inverted in machine code} LDA w I STA x Machine code after local optimizations LDA Y~Y ADA STA : b c a x The only price to pay in the above example is the reservation of the memory cells W and wI (actually w and w I may be the same cell), which will in fact never be used at rnm-time.

CONSTAB is a table which is filled at compile-time and available at run-time ; it consists essentially of values of denotations. e. fitting in the address part of a machine instruction. p". p. Such an address as long as the block in which they are declared has not been left. p) to a variable. p". p) of a variable with the access thus implying no run-time action. p) noted that the result of a selection applied to a variable of access will he provided with the access varia- P~ANST%address is the static of the location of the name on [QST$.

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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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