Source : Free On-Line Dictionary of Computing

G-Code
     
        1. Johnsson & Augustsson, Chalmers Inst Tech.  Intermediate
        language used by the G-machine, an implementation of graph
        reduction based on supercombinators.  "Efficient Compilation
        of Lazy Evaluation", T. Johnsson, SIGPLAN Notices 19(6):58-69
        (June 1984).
     
        2. A machine-like language for the representation and
        interpretation of attributed grammars.  Used as an
        intermediate language by the Coco compiler generator.  "A
        Compiler Generator for Microcomputers", P. Rechenberg et al,
        P-H 1989.