Javac + invokedynamic

Just for fun, this morning, i've patched the java compiler to be able to generate classes that use invokedynamic instead of invokevirtual/invokeinterface when invoking a method. following the JSR292 EDR

The patch is based on the source of the langtools repository of the hotspot project, so to apply the patch, first clone the repository

  hg clone http://hg.openjdk.java.net/jdk7/hotspot/langtools/
 

An then apply the following patch invokedynamic.patch then run ant in langtools/make.
Now, you have a patched javac that will insert an invokedynamic instead of an invokevirtual when calling a method tagged by @InvokeDynamic.

import java.dyn.InvokeDynamic;

public class Test {
  @InvokeDynamic
  public void m(String message) {
    System.out.println(message);
  }
  
  public static void main(String[] args) {
    // here m is invoked dynamically
    new Test().m("hello invoke dynamic");
  }
}

And now, how to run it.
Hum, good question, i'm afraid we have to wait the RI implementation of JSR 292 :)
Or perhaps an enhanced version of the IKVM Proof of Concept.

Cheers,
Rémi