[Pharo-project] Ideas for CompiledMethod proxies?

Igor Stasenko siguctua at gmail.com
Sun Nov 21 17:31:23 CET 2010

Obviously you can't having a single object representation (a tagged
machine word with lowest bit set)
and have two different classes for it.

On 21 November 2010 16:51, Mariano Martinez Peck <marianopeck at gmail.com> wrote:
> On Sun, Nov 21, 2010 at 12:13 AM, Levente Uzonyi <leves at elte.hu> wrote:
>> On Sat, 20 Nov 2010, Mariano Martinez Peck wrote:
>>> On Sat, Nov 20, 2010 at 5:41 PM, Levente Uzonyi <leves at elte.hu> wrote:
>>>> The only problem is that you can't swap-out a method that's used by the
>>>> swap-in code.
>>> Yes, but that's easy to solve. Before swapping everything, I "simulate"
>>> the
>>> swapping of a dummy CompiledMethod. During that, I mark all the
>>> CompiledMethods that were used to perform that. And then, I exclude those
>>> objects from being swapped :)
>> That won't work, because during the simulation you'll only try a single
>> execution path. Swapping in a real method may invoke methods that weren't
>> used during the simulation. For example my implementation uses #storeString
>> to serialize the methods and Compiler >> #evaluate: to deserialize them. So
>> during deserialization a lot of different methods may be invoked.
> Ahhh I got it....
> Are you using Cog?  because with the SmallInteger I have the problem I
> described with #run:with:in:
> Last question....to use SmallIntegers, I need to put some methods in
> SmallInteger, like #run:with:in:  , #doesNotUnderstand: ,  and all the
> methods related to writing and loading back the original compiledMethod.  Of
> course I can put all those methods under a category  *MyProxyPackage  ...
> but I was thinking if there is another way. I would love to have
> MySmallIntegerProxy that extends from ProtoObject (because I want my proxy
> to understand as less messages as possible) and that is threated by the VM
> like a SmallInetger, I mean, that it directly stores the number value in the
> address, and put the last bit in 1.
> Is this possible? how much work can it be?
> Thanks in advance,
> Mariano

Best regards,
Igor Stasenko AKA sig.

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