[Vm-dev] Re: [squeak-dev] uncompacting classes

[Mariano Martinez Peck]

On Wed, Nov 30, 2011 at 10:47 AM, Stefan Marr <squeak at stefan-marr.de> wrote:

>
> Hi:
>
> On 30 Nov 2011, at 10:19, Mariano Martinez Peck wrote:
>
> > I would like to have one extra free bit in the object header. I can hack
> my own VM which uses 4 bits for CompactClasses rather than 5, but do you
> think we can do this for the official Cog VM as well? this would allow
> "researched" a much nice infrastructure out of the box.
>
> If you really need more flexibility, consider adding a compile-time option
> to add an extra preheader to each object.
> We have that in the RoarVM.
> Of course, there is a performance impact. But in return you get what you
> have dreamed of in your wildest dreams... And it is easy to add just
> another word, or another one...
>
>
That' would be very nice to have :)


> We had a bug recently, that required me to clean up the code, I could
> point you at the fix. That should give an indication where you would need
> to adapt the VM.
> And this approach should work at least for the classic interpreter. Not
> sure what that would entail for the stackVM, but for Cog you would probably
> need to adapt the code generation.
>
> Best regards
> Stefan
>
>
> --
> Stefan Marr
> Software Languages Lab
> Vrije Universiteit Brussel
> Pleinlaan 2 / B-1050 Brussels / Belgium
> http://soft.vub.ac.be/~smarr
> Phone: +32 2 629 2974
> Fax:   +32 2 629 3525
>
>


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