My hobbyist coding updates and releases as the mysterious "Mr. Tines"

Sunday, 3 February 2008

Under my nose all the time

Another of those hidden things about J# -- the JbImp tool, which takes .class files and spits out J# assemblies. Just what I wanted, but was looking in the general freeware community for.

Now the full scala-library.jar has a lot of post-J# Java API calls, but by cutting out a lot of the code I can get

>"\Program Files\Microsoft Visual Studio 8\SDK\v2.0\Bin\Jbimp.exe" /t:library /usestubrefs /out:scala-lib.dll /recurse *.class

to work on the remainder of it, and then

>"\Program Files\Microsoft Visual Studio 8\SDK\v2.0\Bin\Jbimp.exe" /t:library /usestubrefs /r:..\JavaLayer.dll ..\scala-lib.dll /out:SClass.dll /recurse *.class

And then build an IronPython project against it and get…

In class com_ravnaandtines.jlayer.JClass1.doSomething(), printing from Jython
In class com_ravnaandtines.jlayer.JClass1.doSomething(), printing Hello Babel!
Traceback (most recent call last):
  File scala-lib, line unknown, in .cctor
  File vjslib, line unknown, in checkAndThrowException
  File src\, line 24, in Initialize
  File , line 0, in NonDefaultNew##27
  File , line 0, in .ctor##29
  File SClass, line unknown, in .ctor
SystemError: The type initializer for 'scala.Console$' threw an exception.

which is progress, and most of what the JVM version does; but as this

    private int len;
    private JClass1 in = new JClass1();

    public SClass(String token)
        len = in().doSomething(token);

is the relevant part of the SClass code decompiled, the failure means that although it has executed some Scala derived code, it has fallen over at the first sniff of runtime.

I hope that a more measured winnowing of the runtime will fix this. But not tonight.

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