Re: [patch] Fix oddity in personality routine

On Fri, Nov 27, 2009 at 10:40:17AM +0000, Andrew Haley wrote:
> borlum wrote:
> > 
> > 
> > Jack Howarth-3 wrote:
> >> On Tue, Nov 17, 2009 at 05:13:31PM +0000, Andrew Haley wrote:
> >>> Sometimes it doesn't work, so you have to be inventive.  Try
> >>> setting a breakpoint on Unwind_RaiseException, or step a single
> >>> instruction at a time when you get to a call.
> >>>
> >>>> I assume that gcc trunk's
> >>>> debug code is still compatible with Apple's gdb. If not, I do have
> >>>> a build of gdb 7.0 on Intel darwin that I can use instead. Thanks
> >>>> in advance for any hints on this issue.
> >>>>               Jack
> >>>> ps I do notice that gdb can't find the object files from
> >>> /sw/src/fink.build/gcc45-4.4.999-20091116/darwin_objdir/x86_64-apple-darwin9.8.0/libjava/.libs/libgcj.lax
> >>> so it might have problems with debugging within libgcj. If I recall
> >>> correctly this .lax issue is known...
> >>>> http://gcc.gnu.org/ml/gcc/2008-10/msg00083.html
> >>> Ouch.  That will cause gdb breakage, for sure.
> >> Andrew,
> >>    Re-reading Peter's comments in
> >> http://gcc.gnu.org/ml/gcc/2008-10/msg00083.html, I think I
> >> may be able to work around the lax issue with the proper setting of
> >> LD_LIBRARY to point to 
> >> the shared library in the build directory. I'll see if I can puzzle that
> >> one out.
> >>                  Jack
> >>> Andrew.
> >>
> > 
> > Hey Andrew,
> > 
> > Did you ever solve the problem? I'm having the same rather frustrating
> > error.
> 
> Not me, no.  I don't have a Darwin system.
> 
> Andrew.

Andrew,
    Now that we have a set of patches to fix the breakage in current gcc
trunk to dsymutil, I have uploaded a much more complete walk under x86_64-apple-darwin10.
I haven't managed to walk into _Unwind_Exception() yet but I do see that the 
crash occurs on continuing from the 39th instance of the _Unwind_Exception() breakpoint.
Is there some way I can get the unwinder data from inside of libgcj itself before
the call to _Unwind_Exception()? If the bad unwind information is being generated in
libjava wouldn't it be just as easy to see that from outside of libgcc (before the call
to _Unwind_Exception()?
               Jack