# Tuesday, 17 March 2009
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New Development Snapshot

One major change: I rewrote exception handling to store exception state in java.lang.Throwable (for non-.NET exceptions) instead of using a weak map. I never got around to doing that earlier, because the overhead of exceptions on the CLR is such that the weak map didn't contribute significantly, but on Mono the situation was very different, as it turns out the weap map was very slow there and exception handling is much faster. Anyway, the result is that on Mono a particular microbenchmark went from 40 seconds to less than a second. On the CLR the performance is also a little bit better, but still horrible.

If you use exceptions for control flow, make sure to override fillInStackTrace (simply "return this") as this saves a lot of time in collecting the stack trace. On previous versions of IKVM this sometimes didn't help, but now it always does.


  • Rewrote exception handling.
  • Moved PDB generating code (used by IKVM.Reflection.Emit.dll) into a separate assembly (IKVM.PdbWriter.dll) to work around missing ISymWrapper.dll on Mono.
  • Made java.lang.Object and java.lang.StackTraceElement serializable (in the .NET sense).
  • Added workaround for Mono bug (Type.IsGenericTypeDefinition throws for non-MonoType types).
  • Fixed ikvm.extensions.ExtensionMethods.printStackTrace() to unmap the exception after printing the stack trace.
  • Volker implemented a couple more AWT graphics functions.

As always with a development snapshot, don't use this in production, but please do try it out and let me know about it. The sources are available in cvs and the binaries here: ikvmbin-0.39.3363.zip

Tuesday, 17 March 2009 07:10:27 (W. Europe Standard Time, UTC+01:00)  #    Comments [3]