The Cims PL/I Compiler: April 1979, Report No; 013 (Classic Reprint) by Paul W Abrahams (Paperback / softback, 2015)

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The compiler is itself written almost entirely in Pl/I. The compiler is a multi-pass affair, and the first three passes are almost entirely machine-independent. Two primary kinds of internal representations are used: a sequential form for information with relatively little interreferencing, and a pointer-linked form for other objects such as declarations and block descriptors.
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