Experimental Physics and
Industrial Control System

On 6/19/24 21:26, Michael Davidsaver wrote:

I see something like the following.  All of the 'f's mean that GCC
is unable to track the sizes of the objects involved.  I also don't
see a fault.

X test.LINR ptemp=ffffffffffffffff,ffffffffffffffff papChoice=ffffffffffffffff,ffffffffffffffff i=0

I spoke too soon.  I can reproduce, but not with a -debug build.
So I guess '-O2' vs '-O3' plays some role?

X test.LINR ptemp=ffffffffffffffff,28 papChoice=ffffffffffffffff,ffffffffffffffff i=0
X test.LINR ptemp=ffffffffffffffff,0 papChoice=ffffffffffffffff,ffffffffffffffff i=1
*** buffer overflow detected ***: terminated

The inferred size of 'ptemp' is 28 bytes, which I can only assume comes from
this line.

ptemp = &(pdbr_enumStrs->strs[0][0]);

I don't understand why 28 and not 1, 30, or 30*40 ?

The first iteration steps past this.

ptemp += sizeof(pdbr_enumStrs->strs[0]);

This is certainly an odd way to iterate an array...

Replies:

Re: Strange problem with EPICS areaDetector Jörn Dreyer via Tech-talk

References:

Strange problem with EPICS areaDetector Jörn Dreyer via Tech-talk

Re: Strange problem with EPICS areaDetector Ralph Lange via Tech-talk

Re: Strange problem with EPICS areaDetector Jörn Dreyer via Tech-talk

Re: Strange problem with EPICS areaDetector Jörn Dreyer via Tech-talk

Re: Strange problem with EPICS areaDetector Michael Davidsaver via Tech-talk

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