Re: RFC: next/finish/etc -vs- exceptions

Tom Tromey
2009-06-10T16:50:58Z

>>>>> "Joel" == Joel Brobecker <brobecker@adacore.com> writes:

Joel> I can't seem to find the time to look at this in more details while
Joel> I'm at the summit, but I always find myself wondering whether it might
Joel> have been possible to use the breakpoint_ops structure rather than
Joel> introducing a couple of breakpoint kinds... I glanced quickly at the
Joel> patch, and I don't think this is the case in this particular instance,
Joel> but did you also look at this option, eventually ruling it out?

Actually I just looked at the longjmp code and did something very
similar. I will take a look at doing this.

It would be nice if we had a flag day and simply converted everything
to breakpoint_ops. That's usually the best way to ensure that new
code is written the "right" way (gcc has also had some bad experiences
with these incomplete transitions).

Also, I recently realized that the patch computes the CFA incorrectly.
Really it ought to always compute the Dwarf CFA. I didn't see a nice
way to do that; if you have any suggestions...

Joel> The feature itself is really interesting, and I wonder if there might
Joel> be something we can do for Ada as well. As far as I know, there is no
Joel> hook just yet, but maybe we can have it added as well. After all, I know
Joel> a few people who work on the Ada compiler ;-).

I was under the impression that Ada used longjmp to implement
exceptions, and so the existing longjmp support should work. (Modulo
the odd bug or two -- I'm not sure if Pedro's fix for the glibc
pointer mangling went in or not.)

Tom