mono/tests/sighelpermod.cs

   1 //
   2 // Not sure how we could automate this test, for now you have to look at the
   3 // generated output (b.dll) and see that the signature for the method called
   4 // (the one with no name :-) looks like this:
   5 //
   6 //  call       instance int32 (bool,
   7 //             class System.String modreq([mscorlib]System.Runtime.CompilerServices.IsBoxed),
   8 //             unsigned int8 modopt([mscorlib]System.Runtime.CompilerServices.IsConst),
   9 //             int32 modopt([mscorlib]System.Runtime.CompilerServices.IsConst),
  10 //             int64 modopt([mscorlib]System.Runtime.CompilerServices.IsConst))
  11
  12
  13 using System;
  14 using System.Reflection;
  15 using System.Reflection.Emit;
  16 using System.Threading;
  17
  18 public class EmitHelloWorld{
  19     static void Main(string[] args)
  20     {
  21         AssemblyName an = new AssemblyName();
  22         an.Name = "HelloWorld";
  23         AssemblyBuilder ab = Thread.GetDomain().DefineDynamicAssembly(an, AssemblyBuilderAccess.RunAndSave);
  24         ModuleBuilder module = ab.DefineDynamicModule("b.dll");
  25         TypeBuilder tb = module.DefineType("type", TypeAttributes.Public | TypeAttributes.Class);
  26         MethodBuilder mb = tb.DefineMethod("test",
  27                                            MethodAttributes.HideBySig | MethodAttributes.Static |
  28                                            MethodAttributes.Public, typeof(void), null);
  29         ILGenerator ig = mb.GetILGenerator();
  30
  31         //
  32         // This is the actual test:
  33         //   Generate a method signature that contains modopts and modreqs
  34         //   and call that.  It has no name or anything, not sure how this
  35         //   is actually used, but we at least generate the stuff
  36         //
  37         SignatureHelper sh = SignatureHelper.GetMethodSigHelper (module, CallingConventions.HasThis, typeof(int));
  38         sh.AddArgument (typeof (bool));
  39         Type [] req = new Type [] { typeof (System.Runtime.CompilerServices.IsBoxed) };
  40         sh.AddArgument (typeof (string), req, null);
  41         Type [] opt = new Type [] { typeof (System.Runtime.CompilerServices.IsConst) };
  42         sh.AddArgument (typeof (byte), null, opt);
  43         sh.AddArgument (typeof (int), null, opt);
  44         sh.AddArgument (typeof (long), null, opt);
  45         ig.Emit (OpCodes.Call, sh);
  46
  47         ig.Emit(OpCodes.Ret);
  48
  49         tb.CreateType();
  50
  51         ab.Save ("b.dll");
  52      }
  53 }