generator        -- Import Statements
    (:  import java.util.LinkedList;
        import comp.codegen.Reg;
        import comp.ast.Node;                            :) 
declarations    -- General Declarations
    (: public LinkedList instrList = new LinkedList();    :)
operators        -- Operators (our Node Kinds)
    CONST(:E_CONST:), ADD(:E_ADD:),
    SUB(:E_SUB:), MULT(:E_MULT:)
rules            -- Production Rules
    reg  = CONST c1 (:  c1.result = Reg.getNextReg();
                        instrList.add("loadI " + 
                                        c1.val + "," + 
                                        c1.result);
                        :) : 1 
        |    ADD a1 ( reg r1, reg r2, reg r3) 
                        (:  a1.result = Reg.getNextReg();
                            instrList.add("add " + 
                                            r1.result + "," +
                                            r2.result + "," +
                                            a1.result);
                         :) : 1
        |    SUB s1 ( reg r1, reg r2, reg r3 )
                        (:  s1.result = Reg.getNextReg();
                            instrList.add("sub " + 
                                            r1.result + "," +
                                            r2.result + "," +
                                            s1.result);
                         :) : 1
        |    MULT m1 ( reg r1, reg r2, reg r3 )
                        (: ... :) : 2
        . 
end