Re: Passing Parameter as Variable vs as address of variable

[Niels Liisberg <nli@xxxxxxxxxxxxxxxxx>]

When you are in ILE then you have extra opportunities like passing pointers
by value and extra information about the variables passed (the OPT-DESC
part).

Also the the options CONST will (or will not) copy the value of a variable
to a hidden place and pass the pointer to the temporary variable.

option STRING will pass a pointer to a zero terminated string like in the
CONST case - handy for call C-library API's

You can say that calling programs is a subset of the ILE options calling
procedures.


On Fri, Aug 25, 2023 at 4:24 PM Vinay Gavankar <vinaygav@xxxxxxxxx> wrote:

> Hi,
>
> Since RPG internally passes the parm as an address of the variable, is
> there any performance advantage in passing the address of the variable as a
> parm instead of the variable itself when the variable is large (say 2K).
>
> Is the answer the same when calling a program vs a procedure in a Service
> Program?
>
> TIA
> Vinay
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