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• W4245763182 abstract "Zed is the base language used to implement the portable realtime operating system Thoth[7], and to write commands, utilities, application programs, and other software which run under Thoth. (Zed is similar to C, although language details are not important in this paper.) One of the founding principles of Thoth is our experience that the hardest problems in porting programs usually arise when interfacing to different operating systems. By porting the whole operating system first, we ensure that other programs see the same system interface. Hence, with a modicum of care in programming, programs can be machine independent in that, without change, they can be compiled for any machine to which Thoth has been ported. Since the Zed compiler is a program which runs under the Thoth operating system, it is portable in this sense, and the same source serves to produce either native mode or cross compilers because it does not depend on the machine on which the compiler will run. Compilers, in common with certain other “system software”, are, however, machine specific in that the output from executing a compiler must be different depending upon the machine on which that output is destined to be run. Clearly, for Thoth to be ported to many machines, the compiler should be portable in this second sense: as much as possible of the source of the compiler should be machine invariant, that is, independent of the target machine, and for those parts which are machine specific, there must be a well organized scheme to assist realizing versions for new machines. The Zed compiler is designed to ease such ports. Actually, the objective is broader than that, because the initial port is only part of the problem: once versions of the compiler are available for several machines, we still have the problems of maintaining all these different versions, enhancing them, and evolving them to follow changes in the language. To do this, we need a structure that is easy to understand and to work with. We also want to minimize the amount of source code for which multiple versions must exist." @default.
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• W4245763182 date "1979-08-01" @default.
• W4245763182 modified "2023-10-18" @default.
• W4245763182 title "Porting the Zed compiler" @default.
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• W4245763182 doi "https://doi.org/10.1145/872732.806958" @default.
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