Ian Piumarta wrote:

>  Helge,
>
>  > I wonder what a J2-NCM VM could do...
>  [snip]

>  What does cost (a *lot*) is block activation, since I have to go
>  through the maps to find the initial nPC based on the intial vPC
>  stored in the closure.  (For compiled methods this cost is only paid
>  when flushing a context out of the context cache, which happens
>  relatively infrequently.)  My #1 request would therefore be to have
>  block bodies compiled into their own CompiledMethods, separate from
>  the home method.  (Or does NCM do this already???  I've not been
>  following the thread very closely.)

I haven't looked at Tim's NCM implementation yet (Hi, Tim!), butI 
know that the VisualWorks implementation has something called
a CompiledBlock, which shares a common superclass with
CompiledMethod (namely, CompiledCode).   I think this is essentially
what you requested.

Tim and I worked together on a project (that shall remain nameless)
where we modified the Squeak VM in a way very similar to Tim's
current NCM implementation (well, actually Tim and Don Charnley
reworked the VM, and I reworked the CompiledMethod class).
It **is** cleaner and more elegant, and makes CompiledMethods
more easily extensible.

--Alan


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