debugging object memory

[Frank Shearar]

If it is, it ought not to be :)

frank

On 11 February 2013 19:03, Noah Evans <noah.evans at gmail.com> wrote:
> Yeah I probably should. I'm a bit wary of doing this though as I
> understand it, the spoon vm is a bit different isn't it?
>
> Noah
>
>
> On Sun, Feb 10, 2013 at 6:57 PM, Frank Shearar <frank.shearar at gmail.com> wrote:
>> I realise you're semi-keeping a lid on this, but the folks on the
>> vm-dev mailing list [1], while probably not terribly knowledgeable
>> about Plan 9 in particular, do collectively have a whole lot of
>> experience debugging the VMs on multiple platforms (including esoteric
>> ones like RISC OS).
>>
>> frank
>>
>> [1] http://lists.squeakfoundation.org/mailman/listinfo/vm-dev
>>
>> On 10 February 2013 17:36, Noah Evans <noah.evans at gmail.com> wrote:
>>> I'm also getting an interesting floating point behavior.
>>>
>>> I'm getting a float division of 1023.0/0.0. This should be caught be
>>> the test !(arg != 0.0) but it isn't. Until I understand the problem
>>> better I'll blame the plan9 compilers. I've gotten the expected
>>> behavior by substituting "(int)arg == 0" which yields something close
>>> to the expected behavior.
>>>
>>> After digging around in the source I'd hazard a guess that the 1023.0
>>> value is ComponentMax in the class Color. If that's true I'd bet that
>>> the division comes from Color>blue. This would imply that the division
>>> is being done backwards and that something is potentially funky with
>>> my stack handling. Does anyone have any experience debugging these
>>> sorts of problems? printAllStacks() is unhelpful, I think this may be
>>> due to some bit of initialization I'm not doing.
>>>
>>> Any thoughts?
>>>
>>> Noah
>>>
>>>
>>> On Sun, Feb 10, 2013 at 3:51 PM, Noah Evans <noah.evans at gmail.com> wrote:
>>>> I've got the vm receiving events (no graphics yet) and I make it to
>>>> the first GC.
>>>>
>>>> At oop=0x213cc94 oopSize is 34852108 which immediately causes a
>>>> segfault. What is the proper way to debug object memory when
>>>> bootstrapping?
>>>>
>>>> Noah
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