mono/tests/dynamic-method-finalize.2.cs

   1 using System;
   2 using System.Reflection;
   3 using System.Reflection.Emit;
   4
   5 delegate int Getter ();
   6
   7 class Host {
   8
   9         static int Field = 42;
  10
  11         Getter g;
  12
  13         public Host (Getter g) {
  14                 this.g = g;
  15         }
  16
  17         ~Host () {
  18                 int d = g ();
  19                 Console.WriteLine (d);
  20         }
  21 }
  22
  23 class Program {
  24
  25         static Host h;
  26
  27         public static int Main ()
  28         {
  29                         DynamicMethod method = new DynamicMethod ("GetField",
  30                         typeof (int), new Type [0], Type.GetType ("Host"));
  31
  32                         ILGenerator il = method.GetILGenerator ();
  33                         il.Emit (OpCodes.Ldsfld, typeof (Host).GetField (
  34                         "Field", BindingFlags.Static |
  35 BindingFlags.NonPublic));
  36                         il.Emit (OpCodes.Ret);
  37
  38                         Getter g = (Getter) method.CreateDelegate (typeof (Getter));
  39
  40                         /*
  41                          * Create an object whose finalizer calls a dynamic method which
  42                          * dies at the same time.
  43                          * Storing into a static guarantees that this is only finalized during
  44                          * shutdown. This is needed since the !shutdown case still doesn't
  45                          * work.
  46                          */
  47                         h = new Host (g);
  48
  49                         return 0;
  50         }
  51 }