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・ xns
・ xoff
・ xon
・ xon/xoff
・ xopen
・ xor
・ xpc
・ xpercase
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・ xpg3
・ xpl
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XPL : FOLDOC
XPL
A small dialect of PL/I used for compiler writing from Stanford, 1967-69. XPL has one-dimensional arrays. I/O is achieved with character pseudo-variable INPUT and OUTPUT, e.g.
OUTPUT = 'This is a line';

It has inline machine code. "Programmers are given all the rope they ask for. Novices tend to hang themselves fairly frequently." XPL has been implemented on IBM 360, {Univac 1100}, {ICL System 4}, {CDC 6000} and Cyber series, {XDS Sigma-5} and {Sigma-7} and DEC PDP-10.
An optimising XPL compiler (version 1) by Robin Vowels is a standard implementation of XPL and is based on McKeeman, Horning, and Wortman's improved {XCOM} (which employs hashed symbol table generation). It includes the extra built-in function COREHALFWORD.
The following areas have been optimised: procedures calls when the argument and corresponding parameter are of the same type, and when the argument is a constant; constant subscripts; use of CORELHALFWOR


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