[Pharo-project] Bug in #pointsTo: ?

Levente Uzonyi leves at elte.hu
Fri Jan 6 16:18:45 CET 2012


On Fri, 6 Jan 2012, Mariano Martinez Peck wrote:

> 2012/1/6 Levente Uzonyi <leves at elte.hu>
>
>> On Fri, 6 Jan 2012, Mariano Martinez Peck wrote:
>>
>>  On Fri, Jan 6, 2012 at 2:59 PM, Stéphane Ducasse
>>> <stephane.ducasse at inria.fr>**wrote:
>>>
>>>
>>>> On Jan 6, 2012, at 2:46 PM, Levente Uzonyi wrote:
>>>>
>>>>  Of course, but I'd check for the class equality first, because it's
>>>>>
>>>> faster (yeah, i know you turned off inlining of #class, but Cog doesn't
>>>> care about that ;)).
>>>>
>>>
>>>
>>> Ok, makes sense.
>>>
>>>
>>>  Another thing that you should add (besides tests of course) is
>>>> SmallInteger >> #pointsTo: which should return false.
>>>>
>>>
>>>
>>> Ok.
>>>
>>>
>>>  Also make sure that pointer tracing tools use #pointsTo:. In Squeak I
>>>> found that some of them "reinvented" this method?
>>>>
>>>>
>>>>  I found a problem with the PointerFinder:
>>> http://forum.world.st/Help-**pointersTo-broken-and-fix-but-**
>>> I-don-t-understand-why-it-**fixes-td4244097.html<http://forum.world.st/Help-pointersTo-broken-and-fix-but-I-don-t-understand-why-it-fixes-td4244097.html>
>>> However, I still don't understand why it works if I use #instVarsInclude:
>>> and doesn't with  #pointsTo:
>>>
>>
>> IIUC your problem is that MethodContext instances show up as objects which
>> point to your object.
>
>
> yes
>
>
>> And in fact (i think, but didn't check) they do point to your object,
>> because the sender of those MethodContexts is the Date object.
>
>
> probably
>
>
>> I think it only depends on when GC will happen. If the GC kicks in too
>> late, then PointerFinder will find those transient objects and they will be
>> listed.
>>
>>
> Thanks Levente. However, #pointersToExcept:  does a GC at the beginning...
> so.. am I missing something?

Yes, at the beginning The MethodContexts are created after that GC.


Levente

>
> Thanks again.
>
>
>>
>> Levente
>>
>>
>>
>>>
>>> Do you mean what I understand :)? that some tools compiled methods? :)
>>>
>>>>
>>>> Stef
>>>>
>>>>
>>>>
>>>
>>> --
>>> Mariano
>>> http://marianopeck.wordpress.**com <http://marianopeck.wordpress.com>
>>>
>>
>
>
> -- 
> Mariano
> http://marianopeck.wordpress.com
>


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