[DISCUSSION] Is Squeak/Smalltalk able to do this?

Withers, Robert rwithers at quallaby.com
Mon Feb 10 17:27:30 UTC 2003


I don't have your paper in front of me (it's on an old machine and also
printed out in a lost doc folder of mine).  As I recall, you mention 4
different techniques for control message sending.  Of the 4 approaches, one
approach was method wrappers and another approach was a vm change to
intercept the lookup.  I took the latter approach, while Nathanael's Traits
work takes the former approach, I believe.

Funny enough, my lookup redirection code required such a method to execute
mixin compiled methods.  The SqueakElib package (on SM) includes
RedirectionManager class>>#primExecuteCompiledMethod:on:withArguments:.

Anothony's impl of the same method, in the CompiledClosures, but mine passes
the receiver as an arg to the prim.  Easier to think about implementing
priviledged access to such a primitive.


> -----Original Message-----
> From: Stephane Ducasse [mailto:ducasse at iam.unibe.ch]
> Sent: Monday, February 10, 2003 2:48 AM
> To: The general-purpose Squeak developers list
> Subject: Re: [DISCUSSION] Is Squeak/Smalltalk able to do this?
> Which technique did you then used?
> Because the paper was not squeak friendly. What I would 
> really like to 
> have in squeak is a primitive to execute a method 
> (CompiledMethod>>value:withReceiver: in VW).
> Stef
> >> You have also MethodWrappers from john Brant (I know 
> somebody ported 
> >> them to squeak).
> >> You can also read my Joop paper: message passing Control 
> in Smalltalk 
> >> available on my webpage.
> >
> >
> > Stephane, your paper was fundamental in implementing SqueakElib.  I 
> > decided to intercept the message lookup, rather than the 
> > wrapper/instrumentation approach.  It turns out that a wrapper is 
> > still needed, but the other goal is to secure these references into 
> > the vm, and the approach taken supports that too.
> >
> > cheers,
> > rob
> >
> >
> >
> Prof. Dr. Stéphane DUCASSE (ducasse at iam.unibe.ch) 
> http://www.iam.unibe.ch/~ducasse/
>   "if you knew today was your last day on earth, what would you do
>   different? ... especially if, by doing something different, today
>   might not be your last day on earth" Calvin&Hobbes

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