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  • Subject: W-code
  • From: Francesco Scafi <fscafi@xxxxxx>
  • Date: Sat, 13 Nov 1999 23:10:18 +0100

At :
http://as400.rochester.ibm.com/beyondtech/translator.htm
I have found:

Introduction

One of the most distinguishing features of the AS/400 computer system is the technology-independent machine interface (MI). The MI architecture defines a complete set of instructions to operate on data and objects, and to control a program's flow of control. In conjunction with development of the Integrated Language Environment (ILE), the MI architecture was extended with additional computation and branching instructions based on W-Code, which is the compiler intermediate language generated by the latest generation of IBM compiler front ends. The result of these extensions is commonly referred to as new MI (NMI).
All programs that execute on the AS/400 RISC models first pass through the translator as a sequence of NMI instructions. Original program model (OPM) compilers produce original MI (OMI) instructions. An additional step in the compile process converts OMI instruction streams to NMI instruction streams that are semantically equivalent. ILE compiler front ends generate W-Code instructions that are then converted to NMI instructions. Currently, there are W-Code compiler front ends for the RPG, COBOL, C, C++, Modula-2 and CL languages. Starting with Version 4 Release 2, Java™ bytecodes can be converted to NMI using the Create Java Program command. The translator recognizes NMI instruction streams produced by all of these sources.
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