is_defined() again [Was: Follow up on profiler development]

[Daniel Kraft]

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Hi again,

I just observed an "interesting" segfault while working on hierarchical
profiling (but it happens as well with the version without my work in
progress):

Running "demo profshow" three times in a row makes Octave segfault --
but GDB shows that the segfault happens not inside some profiler data
collection routine (which I first thought, since I reworked them for
hierarchical profiling) but rather with is_defined().  This routine
becomes more and more mystical to me over time! :D

Any ideas?  But until the problem occurs in a more "direct" situation,
I'll defer this to later.  (Of course, maybe it is still a problem with
my profiler code which corrupts some memory but leads only later to a
segfault ... or something.  Maybe I'll try to run Octave through
valgrind to find that out -- any experience with that?  Does it work?)

Yours,
Daniel

PS: Regarding the hierarchical profiler, I now have the data collection
routines in a state that reproduces the flat profile correctly; but
internally reworked so that the data collection takes place in form of a
hierarchical call-tree rather than the flat table directly.  Next will
be interfacing the hierarchical data to the outside world.

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