trouble building mlvm

[Paul Phillips]

On Tue, Dec 16, 2008 at 05:37:35PM +0100, Iulian Dragos wrote:
> To clarify this point: doing an (what I think) exhaustive search
> through all jars in the output directory yields no CallSite.class, or
> anything in the java.dyn package. Those source files exist in
> sources/jdk.

You are quite right, the whole java.dyn package wasn't being built.  I will guess that when the mlvm 
patches were last tested, the make system built whatever files it found - but now it only builds what is 
specifically enumerated.  I mimicked another java package to get it built, as shown in this patch:

  http://www.improving.org/scala/openjdk.diff

and (along with all the other patch fiddling) I'm almost sort of there:

export JAVA_HOME=/soft/lang/java/davinci/sources/build/bsd-i586/j2sdk-image
export JAVA_OPTS="-verbose -Xbootclasspath/a:$JAVA_HOME/jre/lib/rt.jar -XX:+{InvokeDynamic,MethodHandles}"
export PATH=$JAVA_HOME/bin:$PATH

[paulp at jon demo (exp)]$ scala
Welcome to Scala version 2.7.2.final (OpenJDK Server VM, Java 1.7.0-internal).
Type in expressions to have them evaluated.
Type :help for more information.

scala> import java.dyn._
import java.dyn._

scala> class Foo { def bar(s: String): Unit = { } }                                                 
defined class Foo

scala> val fooType = MethodType.make(classOf[Unit], Array[Class[_]](classOf[String]), false)
fooType: java.dyn.MethodType = (java.lang.String)void

scala> val fooHandle = MethodHandles.findVirtual(classOf[Foo], "bar", fooType)
#
# A fatal error has been detected by the Java Runtime Environment:
#
#  SIGBUS (0xa) at pc=0x01366b0f, pid=49241, tid=2953121792
#
# Java VM: OpenJDK Server VM (14.0-b08 mixed mode bsd-x86 )
# Problematic frame:
# V  [libjvm.dylib+0x366b0f]
#

Oops.  Well, it's something.  It's dying somewhere in MethodHandle::verify_method_type.  I don't know if 
I'm using it right -- I tried to run the demo from "invoke dynamic day" but it NPEs on me pretty fast and 
I didn't have much faith it was up to date with current sources so I didn't investigate too hard.

[paulp at jon demo (exp)]$ $JAVACMD -Xbootclasspath/p:$JAVA_HOME/jre/lib/rt.jar -classpath /local/lib/java/junit.jar:. jdk.java.dyn.InvokeDynamicDemo count-1000
running ID demo
utf8Map: {fakeIdentity=identity, jdk/java/dyn/InvokeDynamicDemo$FakeDynamic=java/dyn/Dynamic, (Ljava/lang/Object;)Ljdk/java/dyn/InvokeDynamicDemo$FakeDynamic;=(Ljava/lang/Object;)Ljava/lang/Object;, FAKE_OPTIONS=[count-1000]}
Exception in thread "main" java.lang.NullPointerException
	at java.dyn.ConstantPoolPatch$1.visitConstantValue(ConstantPoolPatch.java:178)
	at java.dyn.ConstantPoolParser.parseConstantPool(ConstantPoolParser.java:208)
	at java.dyn.ConstantPoolParser.parse(ConstantPoolParser.java:174)
	at java.dyn.ConstantPoolPatch.putPatches(ConstantPoolPatch.java:168)
	at jdk.java.dyn.InvokeDynamicDemo.run(InvokeDynamicDemo.java:146)
	at jdk.java.dyn.InvokeDynamicDemo.main(InvokeDynamicDemo.java:179)

Let us keep soldiering onward, I can see the train at the end of the tunnel...

-- 
Paul Phillips      | These are the climbs that apply men's soles.
Stickler           | 
Empiricist         | 
i pull his palp!   |----------* http://www.improving.org/paulp/ *----------