On Wed, 22 Dec 2010, Stéphane Ducasse wrote:
Hi guys
Ideally I would love to be able to use accessors as the abstraction layer that
they can bring us:
I mean the fact that we could avoid to have offset based bytecode means that we
could reuse a lot more
the methods (in special case - mixins and others).
It's simply a bad idea. If you don't want instance variables, just change
the VM's object representation, but then don't call your system Smalltalk
anymore. ;)
Btw without instance variables you don't need mixins, cause you have
traits.
If you only want mixins (instead of stateful traits), then there's at
least one mixin implementation for Squeak out there.
Now I have a question does the JIT or the shortcut (not sure if this is in
stackVM) blurry the cost of accessors
vs. direct accesses?
Bytecodes are still 10-12x faster with Cog than sends.
Levente
P.S.: IIRC one of V8's optimizations is to use a common representation
(class) for objects that have the same slots (instance variables).
Does anybody run a benchmarck about
self x vs x in Cog recently
on a real app?
Stef
