By Peter W. O’Hearn, Robert D. Tennent
To build a compiler for a latest higher-level programming languagel one must constitution the interpretation to a machine-like intermediate language in a manner that displays the semantics of the language. little is expounded approximately such struc turing in compiler texts which are meant to hide a large choice of software ming languages. extra is expounded within the Iiterature on semantics-directed compiler building  yet the following too the point of view is particularly basic (though constrained to at least one languages with a finite variety of syntactic types). at the different handl there's a substantial physique of labor utilizing the continuation-passing transformation to constitution compilers for the explicit case of call-by-value languages comparable to SCHEME and ML [21 3]. ln this paperl we are going to describe a mode of structuring the interpretation of ALGOL-like languages that's in accordance with the functor-category semantics devel oped via Reynolds  and Oles [51 6]. an alternate method utilizing type conception to constitution compilers is the early paintings of F. L. Morris 1 which anticipates our therapy of boolean expressionsl yet doesn't take care of techniques. 2 kinds and Syntax An ALGOL-like language is a typed lambda calculus with an strange repertoire of primitive kinds. all through such a lot of this paper we suppose that the primi tive varieties are comm(and) int(eger)exp(ression) int(eger)acc(eptor) int(eger)var(iable) I and that the set eight of varieties is the least set containing those primitive varieties and closed below the binary operation -.
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Extra info for ALGOL-like Languages
S"' . \r2. if r1 :S: r2[Sd- s;J'] then K eise i<)))). On the other hand, the translations of boolean Operations and conditional commands simply compose or rearrange the trees produced by subexpressions: [not b]rr,boolexpSI]S' (K, K) = [b]rr,boolexpSI]S' (K, K) [b1 or b2]rr,boolexpS1]S' (K, K) = [bl]rr,boolexpSI]S' (K, [b2]rr,boolexpS1]S' (K, i<)) [if b then c1 eise c2]rr,commSnS' K = [b ]rr,boolexpSI]S' ([Cl ]rr,commSnS' K, [c2 ]rr,commS1JS' K) • Notlee that the second equation describes "short-circuit" evaluation for or.
AI-TR-474, Massachusetts Institute of Technology, Artificial Intelligence Laboratory, May 1978, iii+272 pp. [3) Wand, M. Deriving target code as a representation of continuation semantics. ACM Transactions on Programming Languages and Systems, vol. 4 (1982), pp. 496-517.  Reynolds, J. C. The essence of ALGOL In Algorithmic Languages, Proceedings of the International Symposium on Algorithmic Languages, Amsterdam, October 26-29, edited by J. W. de Bakker and J. C. van Vliet. North-Holland, Amsterdam, 1981, pp.
Calling a subroutine is a more complex operation than merely jumping to an instruction sequence, since it may be necessary to switch context from a ]ohn C. Reynolds 29 frame Iist appropriate to the calling program to a frame Iist appropriate to the subroutine, and since arguments may be passed by placing them in a vector accessible from the new frame Iist. In general, to call a subroutine one must specify 1. the subroutine to be called, 2. the global frame Iist to be used during execution of the subroutine, 3.