about WriteBarrier

[Mariano Martinez Peck]

On Sun, Dec 11, 2011 at 12:52 AM, Chris Muller <ma.chris.m at gmail.com> wrote:

> Hm, not sure what you're seeing..    #canUncompact is implemented only
> Behavior as:
>
> canUncompact
>        ^ (Smalltalk isRunningCog or: [ Smalltalk isRunningCogit ])
>                ifTrue: [ (Smalltalk compactClassesArray includes: self)
> not ]
>                ifFalse: [ true ]
>
> Sounds like you are looking at the wrong version of WriteBarrier.  The
> correct one is WriteBarrier-cmm.35.
>

Indeed, I was looking the implementation in WriteBarrier repo, not the one
inside Magma.
Anyway, that looks strange. You are saying that if you are running in Cog
then you cannot uncompact any compact class?  The only ones you cannot
uncompact are:
Array
LargeNegativeInteger
 LargePositiveInteger
Float
MethodContext

Maybe this is not that important...

Cheers


>  - Chris
>
>
>
> On Sat, Dec 10, 2011 at 5:38 PM, Mariano Martinez Peck
> <marianopeck at gmail.com> wrote:
> > Thanks now I understand why you asked about compact classes. However, you
> > only implement canUncompact  ^ false
> > in CompiledMethod and ContextPart, even if with Cog there are more
> classes
> > that you *cannot* uncompact.
> >
> > Cheers
> >
> > On Sat, Dec 10, 2011 at 5:37 PM, Chris Muller <asqueaker at gmail.com>
> wrote:
> >>
> >> > I would like to take a look to this. In which primitives you need to
> >> > send
> >> > #yourself for example? This is because otherwise the VM will fail /
> >> > crash
> >> > because it expects the parameters of a primitive to be of a certain
> type
> >> > rather than a proxy ?
> >>
> >> Right, this is the problem that has been solved with the new extension.
> >>
> >> > Which are those subclases you mention that override the primitive
> >> > methods?
> >>
> >> The ones that WriteBarrier dynamically instantiates for each class of
> >> object added to the WB.  Please look at the WriteBarrier package (it's
> >> a small, standalone package) and it will become crystal clear.
> >>
> >> > Thanks and congrats for the release.
> >>
> >> Thanks,
> >>  Chris
> >
> >
> >
> >
> > --
> > Mariano
> > http://marianopeck.wordpress.com
> >
>



-- 
Mariano
http://marianopeck.wordpress.com
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