Re: [rvm-research] [rvm-core] Regarding Exception thrown in RefCount Implementation.

Hi Dr. Steve,

Thank you for your reply.   It seems to be it is  not accepting any
additional header words. If I add additional header words other than zero
in Ref Count implementation, the instruction offset is trying to access
0x00000000 and  which leads to recursive use of hardware exception. I can
definitely wait until holiday break gets over for the solution.  Merry
Christmas and Happy New Year to y'all.

Cheers
Hari


On Tue, Dec 24, 2013 at 5:13 AM, Steve Blackburn <[email protected]
> wrote:

>  Hi Hari,
>
>  Sorry for not responding to this earlier.   I have seen this problem
> too.   I will look into it further.   For now, though, it seems to be an
> off-by-one error of some kind.   An unsatisfying, but pragmatic, workaround
> is to allocate N+1 header words (where you desire N).
>
>  Hopefully I’ll be able you offer a better solution after the holiday
> break.
>
>  —Steve
>
>   From: Hari Krishnan <[email protected]>
> Reply-To: "General discussion of Jikes RVM design, implementation,
> issues, and plans" <[email protected]>
> Date: Tuesday, 24 December 2013 1:04 pm
> To: "General discussion of Jikes RVM design, implementation, issues, and
> plans" <[email protected]>
> Subject: Re: [rvm-research] [rvm-core] Regarding Exception thrown in
> RefCount Implementation.
>
>   Hi Erik and Robin,
>
>  Thank you for the reply.  I am using RDB to inspect Boot Image.  I am
> going to download the earlier stable release now  and will let you know the
> status soon.
>
>  Cheers
> Hari
>
>
> On Mon, Dec 23, 2013 at 8:21 AM, Erik Brangs <[email protected]> wrote:
>
>> Hi,
>>
>> On 19.12.2013 01:45, Hari Krishnan wrote:
>> > I cannot figure out why this error pops up.
>>
>>  Based on your previous mails, I assume that you've already read the
>> documentation. I'm not proficient in MMTk so I can't give you any specific
>> advice. However, my experience is that it is a good idea to read a book
>> about debugging if you never had any formal education in debugging.
>>
>> You can also take a look at rdb ( http://sape.inf.usi.ch/rdb ), a Jikes
>> RVM specific debugger that's being developed by Dmitri Makarov and Matthias
>> Hauswirth at the University of Lugano. AFAIK you'll need to use Mac OS if
>> you want to attach to a running Jikes RVM. If you don't use Mac OS, you can
>> still use rdb to examine the bootimage.
>>
>> > I am attaching the patch here that reproduced that error. The error
>> that produced is following:
>>
>>  I can confirm that the patch reproduces the problem on hg tip for the
>> BaseBaseRefCount configuration. I'm not sure whether it's a MMTk problem or
>> a problem in the interaction of MMTk and Jikes RVM. Perhaps the MMTk test
>> harness can be used to determine that?
>>
>>
>> Kind regards,
>>
>> Erik Brangs
>>
>>
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