Praxis compiler internals

Technical Report · Thu Jan 01 04:00:00 EST 1981

OSTI ID:6558998

Evans, A Jr

Praxis is a high level machine-oriented algebraic computer language, designed by Bolt Beranek and Newman, Inc. (BBN) and intended for such applications as process control, communications, and system programming in general. Under contract to Lawrence Livermore National Laboratories (LLNL), BBN has implemented the following three compilers for Praxis: a VAX compiler, running on VAX and producing VAX code; a PDP-11 compiler, running on the PDP-11 and producing code for that machine; and a cross compiler, running on VAX and producing code for the PDP-11. The compilers are written in Praxis and so compile themselves. Further, most of the code is common to the three compilers. This document describes the internal operation of the compilers. The emphasis is on the major data bases and interfaces with little discussion of the details of algorithms, since the latter can readily be deduced from study of the listings providing that the data being manipulated are understood. The purpose of this document is to provide enough information to a maintenance staff that does not include the initial implementors so that they can maintain the compiler and make modifications as requirements change.

• Research Organization: Bolt, Beranek and Newman, Inc., Cambridge, MA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6558998
• Report Number(s): UCRL-15335
• Country of Publication: United States
• Language: English

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