[Vm-dev] Works in SqueakVM but not Cog

Andreas Raab andreas.raab at gmx.de
Mon Dec 13 20:01:29 UTC 2010

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 

(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.

   - Andreas

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