This program throw an Internal Error
import java.dyn.MethodHandle;
import java.dyn.MethodHandles;
import java.dyn.MethodType;
public class MethodHandleInvocationTest {
public static void sayHello(String message) {
System.out.println("hello " + message);
}
public static void main(String[] args) {
MethodHandle mh =
MethodHandles.Lookup.PUBLIC_LOOKUP.findStatic(MethodHandleInvocationTest.class,
"sayHello", MethodType.make(void.class, String.class));
mh.<void>invoke("jsr 292 backport");
}
}
Exception in thread "main" java.lang.InternalError
at sun.dyn.MethodHandleImpl.<clinit>(MethodHandleImpl.java:112)
at java.dyn.MethodHandles.<clinit>(MethodHandles.java:66)
at java.dyn.MethodHandles$Lookup.<clinit>(MethodHandles.java:158)
at MethodHandleInvocationTest.main(MethodHandleInvocationTest.java:11)
I use the jdkb59 here,
but the current mlvm repository patch seems to exhibit the same problem.
MethodHandles$Lookup static init calls MethodHandles.<clinit>
but *before* the call to initLookup(), the class MethodHandleImpl need
to be initialized,
so its <clinit> is called and raise the InternalError.
static final Lookup IMPL_LOOKUP = new Lookup(null);
static { MethodHandleImpl.initLookup(IMPL_TOKEN, IMPL_LOOKUP);
A simple patch, even if it doesn't solve the real problem is to
change the visibility of the constant PUBLIC_LOOKUP in Lookup
and to provide an access through a method in MethodHandles
public static Lookup lookup() {
return new Lookup();
}
public static Lookup publicLookup() {
return Lookup.PUBLIC_LOOKUP;
}
cheers,
Rémi
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