Re: [Ikvm-developers] Using C# attributes from Java

[Michael B. <md...@sa...>]

On Fri, Apr 26, 2013 at 5:02 PM, Michael Bayne <md...@sa...> wrote:

> then convert that to a DLL via IKVM, and then decompile the resulting DLL,
> I get a disassembly like so:
>
>     .custom instance void class
> [mscorlib]System.ThreadStaticAttribute::'.ctor'() =  (01 00 00 00 ) // ....
>
> which has both "instance void class" and quoted '.ctor'.
>

Yet more data:

I thought perhaps something was awry with attributes that take a string
argument, so I tried adding this to my test:

    @cli.System.ObsoleteAttribute.Annotation("Another test")
    public Foo () {
    }

but that seems to work fine:

        .custom instance void class
[mscorlib]System.ObsoleteAttribute::'.ctor'(string) =  (
01 00 0C 41 6E 6F 74 68 65 72 20 74 65 73 74 00   // ...Another test.
00                                              ) // .

I also noticed something strange about the Java stub for System.Obsolete
versus MonoTouch.Foundation.Register:

public final class cli.System.ObsoleteAttribute extends
cli.System.Attribute implements
cli.System.Runtime.InteropServices._Attribute {
  public cli.System.ObsoleteAttribute();
  public cli.System.ObsoleteAttribute(java.lang.String);
  public cli.System.ObsoleteAttribute(java.lang.String, boolean);
  public final native java.lang.String get_Message();
  public final native boolean get_IsError();
}
public interface cli.System.ObsoleteAttribute$Annotation extends
java.lang.annotation.Annotation {
  public abstract java.lang.String value();
}

public final class cli.MonoTouch.Foundation.RegisterAttribute extends
cli.System.Attribute implements
cli.System.Runtime.InteropServices._Attribute {
  public cli.MonoTouch.Foundation.RegisterAttribute();
  public cli.MonoTouch.Foundation.RegisterAttribute(java.lang.String);
  public cli.MonoTouch.Foundation.RegisterAttribute(java.lang.String,
boolean);
  public final native java.lang.String get_Name();
  public final native void set_Name(java.lang.String);
  public final native boolean get_IsWrapper();
  public final native void set_IsWrapper(boolean);
}
public interface cli.MonoTouch.Foundation.RegisterAttribute$Annotation
extends java.lang.annotation.Annotation {
  public abstract java.lang.String value();
  public abstract java.lang.String Name();
  public abstract boolean IsWrapper();
}

It seems strange that the boolean IsError field is not exposed
in cli.System.ObsoleteAttribute$Annotation.

In any case, changing my test code to:

@cli.MonoTouch.Foundation.RegisterAttribute.Annotation(Name="Test",
IsWrapper=false)
public class Foo

does not impact the underlying issue. I still get an apparently bogus
disassembly:

    .custom instance void
[monotouch]MonoTouch.Foundation.RegisterAttribute::.ctor() =  (
01 00 02 00 54 0E 04 4E 61 6D 65 04 54 65 73 74   // ....T..Name.Test
54 02 09 49 73 57 72 61 70 70 65 72 00          ) // T..IsWrapper.

The quest continues...

-- md...@sa...