A Language for System Programs and Its Implementation Using a Macro Processor

概要

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A new programming language ML-ll has been designed and implemented with the following features:(1) system implementation language. (2) structured programming oriented language. (3) implemented by using macro assembly language MACBO-ll for the PDP-ll/20. The space and time efficiency of the program is an important factor in the system programming. The structured programming is useful for productivity including the documentation, the debugging and the maintenance of the programs. But these requirements are often conflicting. To resolve this conflict, ML-1l is implemented as a compound language of a low level assembly language and high level varietal macros. A set. of new macros listed in Table-l are defined. They are classified into four groups. (l) control macros (2) subroutine macros (3) data macros (4) field handling macros. This language is implemented by adding the macro definitions to the system library of the macro assembler. This approach is much easier than preparing the complier. Furthermore, the modification and the extension of this language are very easy.
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