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This directory contains a Unix tar file for the Rochester PL/0 compiler.
The PL/0 language was defined by Wirth in his "Algorithms + Data Structures =
Programs" (Prentice Hall, 1976).  It's basically a tiny subset of Pascal.

The PL/0 compiler is written in C++, with clearly delineated phases,
extensive comments, and a heavily object-oriented style.  It uses a
table-driven scanner and top-down (LL(1)) parser, built by the ScanGen and
FMQ tools available from the University of Wisconsin
(http://www.wisc.edu/~fischer/ftp/tools).  It generates assembly code for
the MIPS II instruction set, which can either be assembled and executed on
SGI machines, or run under the SPIM and XSPIM interpreters, also available
from Wisconsin (ftp://ftp.cs.wisc.edu/pub/spim).