I am interested in the various efforts to add Polymorphic Inline Caches to Squeak, like in

slides - http://www.iam.unibe.ch/~denker/talks/07ICOOLPS/07PICsICOOOLPS.pdf

paper - http://www.hirschfeld.org/misc/media/HauptHirschfeldDenker_2007_TypeFeedback...

For this design they just replace the pointer to the symbol in the method's literal frame with a pointer to an object which then points to that symbol and which also adds the needed information (class / compiled method pairs).

I plan to browse the Exupery sources to see what its PICs are like, but for now I just took a quick look at the various presentations that are available and saw a thread on this list from October 2008. My impression so far is that PICs are short code fragments with pointers to classes and which are treated mostly like native methods.

If there are more details anywhere, it would be very helpful. -- Jecel