On Tue, Feb 15, 2011 at 8:50 AM, Kirill Shirokov <kirill.shiro...@oracle.com> wrote: > - JRuby by Charles Oliver Nutter > - PHP.reboot by Remi Forax > - Smalltalk implementation by Mark Roos (in progress)
My "other" language, Mirah, also has prototype support for invokedynamic using JSR-292, in the following form (similar to C#): def foo(obj:dynamic) obj.bar # dynamic call end > And the main question to early adopters: is JSR292 really helping you: > simplifies and clarifies your code, do you expect performance improvements > over the "old" code as soon as this will be addressed in HotSpot? These are definitely the two benefits we're looking forward to. I'll address them seperately: * Code simplification Because we can use handles and invokedynamic, almost all of JRuby's call protocol will be drastically simpler than it is presently. JRuby has done a good job of re-inventing the wheel when it comes to dynamically optimizing Ruby method calls, but that optimization comes at the cost of great complexity: lots of generated handles of our own, complicated and difficult-to-inline call paths, and so on. Moving to indy will mean we can mostly delete all that logic (and I'm considering a Java 7-specific distribution artifact that does exactly that). * Performance Because JRuby does a pretty good job optimizing, indy only recently started to be faster than our normal call protocol logic. I expect to see it get better and better as more of the method handle chain inlines and optimizes with the rest of the calling method. Seeing a recent indy build run 30% faster than our normal protocol was a great feeling. Schedule-wise, JRuby was the first language to support JSR-292 in any form...about two years ago. We have not worked heavily on 292 support since then, but I intend to make JRuby 1.7 fully indy-fied from end to end (I estimate we'd release that some time this summer). - Charlie _______________________________________________ mlvm-dev mailing list mlvm-dev@openjdk.java.net http://mail.openjdk.java.net/mailman/listinfo/mlvm-dev
