Re: Debug question

IBM did see the need - that's why you have DS arrays and MODS are deprecated.

The very nature of the way MODS are handled by means that there is only ever one active element.

Any debug capability would need to be RPG specific and generally the debugger has never done that. Like Scott I've been adding a pointer mapped equivalent whenever I needed to debug MODS and was not able to change to a nested DS.

It certainly makes no sense to make this kind of change today some 15 years after MODS became obsolete.



Jon Paris

On Feb 12, 2021, at 12:16 PM, dr2@xxxxxxxx wrote:

Scott..

no arguments...however when you walk into a shoppe you have to use
what's in production and when that's what's in production, it is what it
is...

What has surprised me is that IBM didn't see this need DECADES ago and
build it it...but then, how many decades after how much asking did it
take them to FINALLY put .pdf as an option in OVRPRTF ?????

DR2

On 2021-02-12 09:51, Scott Klement wrote:

This is one of the quirks of the old multiple-occurrence data structure support that came from RPG III, you can only see one element at a time.

I want to be absolutely clear: Multiple occurrence data structures (MODS) have been obsolete since 2001 (that's 20 years ago!) You should be using data structure arrays today!!

Assuming that this is old code and you don't have the time to rewrite it, though... In days of yore, I would write a subroutine that looped through the data structure. I would not call it normally, but would have a 'debug flag' (indicator) that would cause the program to call this subroutine at key points. Then, I could step through the subroutine to see what was in the different elements of the MODS.

In the early 2000's when DS arrays came along, I changed my technique to overlay my MODS with an array of data structures. I'd use a pointer to base the array on the first element of the MODS (its very important to set the pointer when the MODS is set to the first occurence.) Then, I would always be able to view the DS array in the debugger, even if the code didn't use the array version.

At this point, though... I haven't used a MODS in probably 15 years.

On 2/11/2021 5:29 PM, dr2@xxxxxxxx wrote:

In Debug, in RPG... I have DS with multiple occurs.... When I do an
eval xxx I want to see ALL elements in the array... How can that be
done?

DR2

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