On Wed, Jan 23, 2013 at 9:01 AM, Igor Stasenko
<siguctua@gmail.com> wrote:
On 23 January 2013 17:27, Sean P. DeNigris <
sean@clipperadams.com> wrote:
> EstebanLM wrote
>> Pharo 2.0 will be released with a stable, branded vm with a bunch of
>> useful plugins and libraries (like freetype) and out-of-the-box support
>> for NativeBoost.
>> ...
>> For Pharo 3.0 we are even more ambitious: we want to start replacing some
>> important parts of the vm with plugins (like extract a "DisplayPlugin", so
>> we can control from image side the initialization of a morphic world or
>> something extra. And we want to replace BitBlt plugin with Athens, so that
>> will keep us busy enough time.
>
> Wow, very exciting! Thank everyone for the hard work :)
>
>
> EstebanLM wrote
>> - ephemerons support.
>
> Is this currently available? If so, does that mean that weak announcements
> taking a block are now working properly?
>
After discussing with Eliot, he recommended to use last object format
to denote ephemerons.
Existing implementation is a bit hackish way to determine if object is
ephemeron.
So, before we do such change, assume they are not working yet.
Yes, please. �This is the only thing that has kept me from integrating the ephemeron work. �We can use instSpec/format #5. �The�instSpec/formats are
0: zero-fixed-sized�pointers�(e.g. UndefinedObject)
1: non-zero-fixed-sized pointers (e.g. Point (x,y))
2: zero-fixed-size variable pointers (e.g. Array)
3.�non-zero-fixed-sized variable pointers (e.g. AdditionalMethodState (method,selector))
4.�arbitrary-fixed-sized variable weak pointers (e.g. WeakFinalizerItem (list,next,executor)
5. unused
6. variable�32-bit non-pointers (e.g. Float)
7. unused (but should be odd bit for length of format 6 objects in 64-bit system)
8. variable 8-bit non-pointers (e.g. ByteArray, String)
9,10,11 odd bits for length of format 8 objects
12 hybrid variable pointers, variable bytes (CompiledMethod and subclasses)
13,14,15�odd bits for length of format 12 objects
So 5 is the obvious one. format <= 5 are pointers, format <= 5 or >= 12 contain pointers. �7's a really bad choice.
And I won't bore you with the extension to 64-bits and a 5 bit field.
> Also, is the Pharo branded VM on the static file server based on Jit Cog (as
> opposed to stack, etc)?
>
which server?
--
Best regards,
Igor Stasenko.