Re: Prototype in RPG/ILE

["Peter Dow" <pcdow@xxxxxxxxx>]

Hi Hans,

I guess I misunderstood. You said

"No, it isn't easier for the compiler, since it has to
verify that the prototypes (PR specs) for procedures match
their corresponding procedure interfaces (PI specs)."

What did that mean? It sounded like you were saying the compiler compares
the PR specs with the PI specs. If you're compiling a module that refers to
a procedure in another module, how does it do that? It has the PR specs
(preferrably from a /COPY) but what about the PI specs?

Confused,
Peter Dow
Dow Software Services, Inc.
909 425-0194 voice
909 425-0196 fax

From: <boldt@ca.ibm.com>
> Peter wrote:
> >Aha! So in fact the compiler _is_ already going out and finding the
> >procedure interface whereever it may be in order to compare it to the
> >prototypes? I had the impression it was simply using the prototypes to
> >verify the procedure call parameters without having to find the procedure
> >interfaces, saving a lot of hunting for the PI specs.
>
> Huh?  Where did you get that idea from what I wrote?
>
> A module that exports a procedure needs both PR (prototype) and
> PI (interface) specs.  Normally, the PI is specified in the
> source file as part of the procedure and the PR is specified in
> a /COPY member included using a /COPY spec in the modules source.
> The compiler does not hunt around looking for things - the
> programmer needs to explicitly specify these things.
>
> On the other hand, a module that uses a particular procedure
> needs just the PR specs.  It gets them by including the /COPY
> member that contains them.


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