[Vm-dev] Works in SqueakVM but not Cog

Eliot Miranda eliot.miranda at gmail.com
Mon Dec 13 20:30:03 UTC 2010

On Mon, Dec 13, 2010 at 12:01 PM, Andreas Raab <andreas.raab at gmx.de> wrote:

> On 12/13/2010 11:52 AM, Igor Stasenko wrote:
>> The problem i that we want to swap special objects array. And there
>> are two approaches:
>> 1  - create a full object memory , which is a copy of existing objects
>> (but not everything, just selected pieces). This means that there will
>> be two 'nils' and therefore need a working #become: for swapping.
>> 2  - mark a set of objects for inclusion in 'new' image, and throw
>> away the rest via stubbing. So, this approach avoids copying, but also
>> it doesn't allows to hold two object memories in object memory at same
>> time (host and baby one).
> There are at least two more options:
> (3) Write a primitive that replaces the special objects array and includes
> a set of classes to be updated (this would include all the literals).

which would give Cog the opportunity to void its code cache, hence  avoiding
its limitations w.r.t. nil true false and the character table.

good approach

> (4) A variant on the above would make all these classes be compact and have
> them switch implicitly by replacing the compact classes array in the
> splObjs.

yes; as long as this is primitive Cog can intercept and react apropriately.


> Cheers,
>  - Andreas
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