Re: [patch] Fix oddity in personality routine

[Andrew Haley <aph at redhat dot com>]

Jack Howarth wrote:
> On Sun, Nov 29, 2009 at 06:00:57PM +0000, Andrew Haley wrote:
>> Jack Howarth wrote:
>>> On Sat, Nov 28, 2009 at 10:43:26AM +0000, Andrew Haley wrote:
>>>> Jack Howarth wrote:
>>>>> On Fri, Nov 27, 2009 at 10:40:17AM +0000, Andrew Haley wrote:

>>>>
>>>    I managed to get a build of libgcc at -O0 under darwin9 that I used to walk through
>>> the FSF gcc unwinder. The walk is at...
>>>
>>> http://gcc.gnu.org/bugzilla/attachment.cgi?id=19174
>>>
>>> and the list of the frames is at...
>>>
>>> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41991#c26
>>>
>>> Does this clarify the problem at all on intel darwin? Let me know if there
>>> is any other particular debug information I can provide.
>> It stops when unwinding java.lang.ClassLoader.loadClass(java.lang.String, boolean),
>> either because the unwinder data is buggy (probably) or because the unwinder
>> itself is buggy.
> 
>   Would it help if I just used a breakpoint on uw_frame_state_for() and provided all
> of the unwinding info that is being processed? Might that clarify if the unwinder
> data is buggy?

Not really, no.  The only thing now is to debug the unwinder at the point
where the exception should be caught.  You're seeing a bus error in the
unwinder itself, which points to a failure to follow the chain of stack
frames.

Andrew.