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Re: [PATCH/i386newframe] Add asssertion to CFI frame unwinder
- From: Elena Zannoni <ezannoni at redhat dot com>
- To: gdb-patches at sources dot redhat dot com
- Cc: Mark Kettenis <kettenis at chello dot nl>
- Date: Tue, 24 Jun 2003 17:32:20 -0400
- Subject: Re: [PATCH/i386newframe] Add asssertion to CFI frame unwinder
- References: <200305291602.h4TG2HVr031955@elgar.kettenis.dyndns.org><16119.32928.499250.823983@localhost.redhat.com>
Elena Zannoni writes:
> Mark Kettenis writes:
> > This assertion can unfortunately be triggered. Don't know how to fix
> > the bug yet, but this makes clear there is a bug.
> >
> > Mark
> >
> > Index: ChangeLog
> > from Mark Kettenis <kettenis@gnu.org>
> >
> > * dwarf-frame.c (dwarf2_frame_cache): Assert that we have a FDE.
> >
> > Index: dwarf-frame.c
> > ===================================================================
> > RCS file: /cvs/src/src/gdb/Attic/dwarf-frame.c,v
> > retrieving revision 1.1.2.6
> > diff -u -p -r1.1.2.6 dwarf-frame.c
> > --- dwarf-frame.c 23 May 2003 20:18:32 -0000 1.1.2.6
> > +++ dwarf-frame.c 29 May 2003 15:47:12 -0000
> > @@ -483,6 +483,7 @@ dwarf2_frame_cache (struct frame_info *n
> >
> > /* Find the correct FDE. */
> > fde = dwarf2_frame_find_fde (&fs->pc);
> > + gdb_assert (fde != NULL);
> >
> > /* Extract any interesting information from the CIE. */
> > fs->data_align = fde->cie->data_alignment_factor;
>
>
> I am running into this in several cases running the testsuite on x86.
> For instance for me callfuncs.exp just doesn't do anything, because
> the assertion is triggered at startup.
> what exactly is happening?
>
> thanks
> elena
Well, this is a problem with the infimous separate debug info. The
.debug_blah sections are in one objfile (the .debug one), while the
.eh_frame is in another (the stripped executable). However, there is
an empty .eh_frame in the .debug file as well. This one is the one
that screws things up. I'll post a patch separately.
elena