From: Charles Oliver Nutter <charles.nutter@...>
Date: 2007-11-12T04:18:27+09:00
Subject: Re: JRuby performance questions answered

evanwebb@gmail.com wrote:
> The big problem with this approach is the RARRAY(), RSTRING(), etc
> macros, that access an object directly as C data structure. Thats the
> main reason for trying to move MRI away from using these macros and to
> using something that looks like a function call that we in rubinius
> can implement differently.

This is also, incidentally, why JRuby doesn't support extensions yet. 
The same techniques in Rubinius would apply equally well to JRuby 
through a JNI-level Ruby API. But so long as extensions abuse their 
direct memory access privileges, neither Rubinius nor JRuby can run them.

- Charlie