On 13.01.2014, at 21:56, Stefan Marr <smalltalk at stefan-marr.de> wrote:

> Hi Tobias:
> 
> On 12 Jan 2014, at 18:47, Tobias Pape <Das.Linux at gmx.de> wrote:
> 
>> I really don’t like to say it, but it seems to me, that a 
>> VM primitive (say #primAllObjectsDo:) would be apt here.
>> • is more easy implemented by cousin VMs (say, Potato, SqueakJS, 
>> SPy/RSqueakVM, SqueakMaxine† 
> 
> How do you implement that efficiently in RPython, or Java?
> Keeping some kind of object table around?
> 

Well, I have no Idea currently, but i think some #primAllObjectsDo:
(or #primAllObjects, as it seems now) has IMHO less severe constraints
than the #someObject/#nextObject way.
 OT is one path. Manual heap scanning another. Collecting objects from
the roots (special objects array) a third. All these do not require 
the #nextObject invariant.

Best
	-Tobias
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