P.S.: Re: When ctl-opt main() is missing...

Am 31.10.2024 um 17:02 schrieb Daniel Gross <daniel@xxxxxxxx>:

Yes - one would think, that the compile can "sense" this and emit an error message.

In my memory, I have a compiler error in mind, that would read somehow like this: "The compiler can not detect how the program is ended." And I thought this error would come, if no return, no *INLR and no primary file was coded in the program.

But my memory might trick me on this - I really don't know. And even if this kind of error message exists (or existed) this might be a constellation that the compiler simply cannot detect.

Kind regards,
Daniel

Am 31.10.2024 um 16:40 schrieb Martijn van Breden <m.vanbreden@xxxxxxxxxxxxxxxxxxxxxxxxxx>:

Hi Daniel,

Your explanaition seems to be quite to the point, thanks! I didn't think of it this way. The program is just very busy doing nothing, as there were no "C-specs" outside of any procedure and there were only usropn file specifications.
Still... the compiler might notice this IMHO


Kind regards,



Martijn van Breden

lead software architect







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Van: RPG400-L <rpg400-l-bounces@xxxxxxxxxxxxxxxxxx> namens Daniel Gross <daniel@xxxxxxxx>
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Onderwerp: Re: When ctl-opt main() is missing...

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Hi Martjin,

this program works indeed as intended.

If you do not code the "main(..)" keyword, you end up with a "traditional" ILE-RPG program which uses the cycle main "procedure".

This cycle main "procedure" is not enclosed in "dcl-proc/end-proc" and it is normally repeated for every record in a primary or secondary file. The cycle main "procedure" ends, when the last record was processed and the *INLR indicator is *ON when it reached the end of the cycle main "procedure".

But you might have no primary or secondary file - so the LR indicator doesn't switch *ON automatically, so you have to code *INLR = *ON somewhere in the cycle main "procedure".

So if all your code is enclosed inside of "real" procedures, you have effectively an empty cycle main "procedure" - which is repeated until *INLR is *ON ... which never happens - resulting in an endless loop.

And even as the new Power10 processors are really fast - they really just can't finish an endless loop.

HTH and kind regards,
Daniel

Am 31.10.2024 um 15:40 schrieb Martijn van Breden <m.vanbreden@xxxxxxxxxxxxxxxxxxxxxxxxxx>:

Hi all,

I've just helped out a very experienced colleague with a program that just wouldn't run. In debug it halted at **free. It showed status RUN in WrkActJob eaiting quite some CPU. In the call stack it stopped just past program entry point _QRNP_PEP.... We were not even able to force it into an error with the wrong number of parameters.
After a couple of hours testing we found that the ctl-opt main() keyword was missing.

I would say that the compiler should have been able to tell us about this situation or that it could have just ungracefully failed runtime.

Just out of curiosity: is there a reason why a program with this condition does indeed compile and can be called without failing?

Thank you for any shared thoughts


Kind regards,



Martijn van Breden

lead software architect






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