Few questions about invokeDynamic

[Rémi Forax]

Le 08/11/2010 20:52, assembling signals a écrit :
> Ok, I extended my "benchmark" to support a method handle with spread args,
> and this part slower than everything else :(
>    

No chance.

> Note: I use Object[] for spread arguments, because in my real-world scenario,
> as mentioned before, I would need any possible method signature to work.
>    

You can also use invokedynamic and linked to the spread
version of the method handle.

But sadly, it crashes the VM.
The test case below reproduces the bug.

Rémi

-------------------------------------------------------------------------------
import java.dyn.CallSite;
import java.dyn.InvokeDynamic;
import java.dyn.Linkage;
import java.dyn.MethodHandle;
import java.dyn.MethodHandles;
import java.dyn.MethodType;


public class IndySpreadBug {
   public static void main(String[] args) throws Throwable {
     for(int i=0; i<1000000; i++) {
         InvokeDynamic.foo(new Object[]{2,3});
     }
   }

   private static void foo(int i, int j) {
     //System.out.println(i + " " + j);
   }

   private static CallSite bootstrap(Class<?> declaring, String name, 
MethodType type) throws Throwable {
     CallSite cs = new CallSite();

     MethodHandle mh = 
MethodHandles.lookup().findStatic(IndySpreadBug.class, "foo",
         MethodType.methodType(void.class, int.class, int.class));
     mh = MethodHandles.spreadArguments(mh, type);
     cs.setTarget(mh);
     return cs;
   }

   static {
     Linkage.registerBootstrapMethod("bootstrap");
   }
}