RE: Tracing statements executed in debug

[Martin Rowe <martin@xxxxxxxxxx>]

On Tuesday 17 December 2002 6:41 pm, Dan wrote:
> Actually, it's a little more complicated than that.  This is a
> 2800-line Cobol program which uses "PERFORM par1 THROUGH par9-exit".
> I'm not an expert on Cobol, but I believe Cobol will "perform" every
> paragraph beginning from par1 and (through) par9-exit.  It's more
> difficult than isolating an RPG subroutine call.
>
> But your advice will be useful in the future, as I had not considered
> that idea before.

Hi Dan

I was going to suggest one of my routines which links trace data to a
program's source. I now see you want it for Cobol, and my routine is
geared up for RPG, but should work for Cobol too (it works for CL). The
technique is a bit more sophisticated that using a DSPTRCDTA(*PRINT), as
you don't have to parse the printfile afterwards.

This is due to a nice feature of ADDTRC is that you can specify a trace
program. This will be called everytime the trace condition is met, with
(ISTR) four parameters (program, library, machine instruction & source
sequence). With this you can STRDBG with MAXTRC(1) TRCFULL(*WRAP), and
ADDTRC with no conditions which will let your TRCPGM process each
executed line. My routine just writes to or updates a file with the line
info, so it can produce a code listing which also shows the number of
times each line has been executed. It would be fairly easy to tweak this
to show the code lines in executed order instead. In fact I have an
earlier routine (from '94) that does this, but only for RPG400, and it
uses the parse DSPTRCDTA(*PRINT) technique, so is a bit slower. At least
that's how I remember it, as I'm not sure I've used it since we moved off
our old B45!

Code is at http://www.dbg400.net/extras.html#runpgmtrc with the already
mentioned proviso that this only works for OPM code - not ILE.

Regards, Martin
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