Friday, November 01, 2002

This weblog has moved to http://weblog.ikvm.net/

GetHashCode & reflection What is the output of the following code fragment?   object o = "foo";   Console.WriteLine(o.GetHashCode());   Console.WriteLine(typeof(object).GetMethod("GetHashCode").Invoke(o, null));   Console.WriteLine(typeof(string).GetMethod("GetHashCode").Invoke(o, null)); .NET 1.0 says: 193410979 23 193410979 .NET 1.1 beta says: 193410979 193410979 193410979 Mono 0.13 says: 101574 1554225471 1554225471 Mono 0.16 says: 101574 33369132 101574 Note: the actual numbers are irrelevant, it matters if they match up or not. .NET 1.1 is correct, the others aren't. The funny thing is, I just realised that IK.VM.NET currently depends (for its System.identityHashCode implementation) on the broken behavior. .NET 1.0 only behaves this way for methods in String, for other types reflective method invocation works the same as a virtual method call. In Mono 0.16 all reflective method invocations appear to be non-virtual. 2:41:12 PM    Comments

This weblog has moved to http://weblog.ikvm.net/

Dependencies Thanks to Zoltan Varga for trying to compile IK.VM.NET on Mono. He pointed out some problems: I used the undocument C# __arglist keyword in my multianewarray helper method, but since Mono's C# compiler doesn't support that and it isn't part of the standard, I reworked that to get rid of the __arglist construct. zlib.dll is a part managed part unmanaged dll, and thus it will not run on Mono. I removed the zlib.dll dependency and I've changed ikvmc and netexp to use java.util.zip.* from classpath.dll. This change has introduced a circular dependency: ikvmc is used to generate classpath.dll, but it also depends on it. Other changes: started on NAnt build files, to support building the project outside of Visual Studio .NET, and (in the future) hopefully without platform dependencies. All Classpath's native methods are now (at least partially) implemented, except for java.nio.* Updated the binaries and source snaphots. 11:01:07 AM    Comments