[Vm-dev] Detecting objects that point to an object

[Mariano Martinez Peck]

On Thu, Jul 15, 2010 at 2:42 PM, Rob Withers <reefedjib at yahoo.com> wrote:

>
>  Utilities pointersTo: object
>
>
Thanks Rob. But that implementation does a someObject and then loops with
nextObject. Thus, it does a full memory scan. I want to avoid that. So the
only way is storing somewhere such pointers or at least a counter I think.

Thanks agian

mariano


> ----
> http://www.noharmmeansnofoul.org
>
>
>
>  *From:* Mariano Martinez Peck <marianopeck at gmail.com>
> *Sent:* Thursday, July 15, 2010 8:40 AM
> *To:* Squeak Development Discussion Virtual Machine<vm-dev at lists.squeakfoundation.org>
> *Subject:* [Vm-dev] Detecting objects that point to an object
>
>  ------------------------------
>
> Hi folks. I need to know the objects (actually, only how many) that are
> pointing to any object. So...I take an object X, and I want to know how many
> objects are pointing to X.
>
> The only possible I see in Squeak VM is to do a full mark over all objects
> in memory (or starting by the roots). This is time consuming and I even need
> (maybe) to do this check (to know how many objects are pointing to an
> object) for every single object.
>
> So...is there a faster solution for this? The only thing I can imagine is
> to modify the object header, maybe create a new type, and add an array with
> the addresses of the objects that are pointing to that object. Or maybe just
> a counter that I can increase or decrease ?
>
> Thanks for any tip.
>
> Mariano
>
>
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