[PATCH][gdb] Fix internal-error in process_event_stop_test

[Hafiz Abid Qadeer]

On 08/01/2021 05:23, Tom de Vries wrote:
> On 1/7/21 9:10 PM, Tom Tromey wrote:
>>>>>>> "Tom" == Tom de Vries <tdevries@suse.de> writes:
>> Tom> Fix this by only trying to install the master exception breakpoint in
>> Tom> libgcc.debug using the _Unwind_DebugHook method, if the install using probes
>> Tom> in libgcc failed.
>>
>> This seems like a reasonable idea.
>>
>> Tom> Any comments?
>>
>> I suspect this would be a bit shorter if the loop only examined
>> "primary" objfiles (ones that don't have a backlink) and then delegated
>> to a helper function that did the search.  What do you think?
> I've made the loop now over "primary" objfiles.  Also, I've split up the
> helper function into one using probes, and the other using the hook,
> which hopefully helps to make the code a bit clearer.
> 
> I'll put this through testing and commit, unless there are further comments.

Hi Tom,
I observed that nextoverthrow.exp is now failing for many targets
including arm-none-eabi after this change.

> +      /* Iterate over separate debug objects and try an _Unwind_DebugHook
> +	 kind breakpoint.  */
> +      for (objfile *sepdebug = obj->separate_debug_objfile;
> +	   sepdebug != nullptr; sepdebug = sepdebug->separate_debug_objfile)
> +	if (create_exception_master_breakpoint_hook (sepdebug))
> +	  break;

This bit seems to be problematic as it is stopping exception breakpoint
to be installed when separate_debug_objfile is null.

Thanks,
-- 
Hafiz Abid Qadeer
Mentor, a Siemens Business