[Vm-dev] Merging SqueakVM and CogVM

Mariano Martinez Peck marianopeck at gmail.com
Thu Jul 8 09:23:50 UTC 2010


On Thu, Jul 8, 2010 at 5:38 AM, David T. Lewis <lewis at mail.msen.com> wrote:

>
> On Wed, Jul 07, 2010 at 06:01:42PM -0700, Andreas Raab wrote:
> >
> > On 7/7/2010 3:11 PM, David T. Lewis wrote:
> > >Personally, I do not have a good sense of how this should be handled.
> > >I expect that we will want to keep the traditional SqueakVM alive
> > >and healthy for at least a few years into the future, but I do not
> > >know if it is better to merge it with the StackVM, or just let it
> > >be separatedly maintained for some period of time.
> >
> > Eliot needs to comment on this but the intention was always to keep the
> > "classic" Squeak VM working and add the context-to-stack mapping
> > (StackInterpreter) and the JIT (CoInterpreter). So the real work would
> > be to merge the Interpreter sources and promote any necessary changes to
> > [Stack|Co]Interpreter as needed.
>
> So possibly the common portions of Interpreter and StackInterpreter could
> be moved into a shared base class? The hierarchy looks a bit tortured,
> but it should keep both the simulators and the C code generator happy.
>
>  ObjectMemory
>    InterpreterBase
>      NewObjectMemory
>


I am completly ignorant, but cannnot we have a better name than
NewObjectMemory?   What if then we have a even newer one?



>        StackInterpreter
>          CoInterpreter
>            CogVMSimulator ...
>      Interpreter
>        InterpreterSimulator ...
>
> The above structure could be accomplished in steps as time permits,
> checking at each update to ensure that the generated interp.c remains
> unchanged for both Interpreter and CoInterpreter.
>
> If it turns out that the methods in StackInterpreter are more or less
> a superset of those in Interpreter (I have not checked in detail), then
> the InterpreterBase class would go away:
>
>  ObjectMemory
>    Interpreter
>      InterpreterSimulator ...
>      NewObjectMemory
>        StackInterpreter
>          CoInterpreter
>            CogVMSimulator ...
>
> Dave
>
>
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