[Mono-dev] Bug?: Mcs Custom Attribute Handling

[Norbert Berzen]

Hi all,

After compiling 'mono-tools-1.1.11' by 'mcs-1.1.14' I ran into some
trouble during execution of 'browser.exe'. IMHO recent version(s) of mcs
(1.1.14 and may be earlier) introduce a bug custom attribute handling.

E.g.: In a declaration of the form

class SomeClass {
  [SomeCustomAttribute] int x, y;
}

the field 'x' does not have any 'SomeCustomAttribute' attached to it,
but the field 'y' does have two 'SomeCustomAttribute' attached to it.
One may proof by compiling the following small snippet.

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using System;
using System.Reflection;

[AttributeUsage(AttributeTargets.Field)]
class SomeCustomAttribute : Attribute {
  public SomeCustomAttribute ()
  {
  }
}

class MainClass {

  // Here, the custom attribute is attached correctly
  [SomeCustomAttribute]
  public int a;

  // Here, the custom attribute attachment has a flaw
  [SomeCustomAttribute]
  public int x, y;

  public static void Main ()
  {
    Type t = typeof (MainClass);
    FieldInfo[] fia = t.GetFields();

    foreach (FieldInfo fi in fia) {
      object[] ca = fi.GetCustomAttributes(false);
      System.Console.WriteLine ("Field: {0} [{1}]", fi.Name, ca.Length);
      foreach (Attribute a in ca)
        System.Console.WriteLine ("  Attribute: {0}", a);
    }
  }

}

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-- 
Norbert