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using System;
using System.Threading;
using System.Reflection;
using System.Reflection.Emit;
/*public delegate void FooDelegate ();*/
public class EmitTest
{
static ConstructorBuilder ctor;
static MethodBuilder targetMethod;
static MethodBuilder testEvents;
static Type fooOpenInst;
static Type[] genericArgs;
static void EmitCtor (TypeBuilder genericFoo) {
ConstructorBuilder mb = genericFoo.DefineConstructor (MethodAttributes.Public, CallingConventions.Standard, null);
ILGenerator il = mb.GetILGenerator ();
for (int i = 0; i < 20; ++i)
il.Emit (OpCodes.Nop);
il.Emit (OpCodes.Ldarg_0);
il.Emit (OpCodes.Call, typeof (object).GetConstructors()[0]);
il.Emit (OpCodes.Ret);
ctor = mb;
}
static void EmitTestEvents (TypeBuilder genericFoo) {
MethodBuilder mb = genericFoo.DefineMethod ("TestEvents", MethodAttributes.Public, typeof (void), null);
ILGenerator il = mb.GetILGenerator ();
for (int i = 0; i < 20; ++i)
il.Emit (OpCodes.Nop);
il.Emit (OpCodes.Ldarg_0);
il.Emit (OpCodes.Ldnull);
il.Emit (OpCodes.Callvirt, targetMethod);
il.Emit (OpCodes.Ret);
testEvents = mb;
}
static void EmitTargetMethod (TypeBuilder genericFoo) {
MethodBuilder mb = genericFoo.DefineMethod ("TargetMethod", MethodAttributes.Public, typeof (void), new Type[] {typeof (object) });
ILGenerator il = mb.GetILGenerator ();
for (int i = 0; i < 20; ++i)
il.Emit (OpCodes.Nop);
il.Emit (OpCodes.Ldtoken, genericArgs [0]);
il.Emit (OpCodes.Call, typeof (Type).GetMethod ("GetTypeFromHandle"));
il.Emit (OpCodes.Call, typeof (Console).GetMethod ("WriteLine", new Type[] { typeof (object) }));
il.Emit (OpCodes.Ret);
targetMethod = mb;
}
public static int Main () {
AssemblyName assemblyName = new AssemblyName();
assemblyName.Name = "customMod";
assemblyName.Version = new Version (1, 2, 3, 4);
AssemblyBuilder assembly
= Thread.GetDomain().DefineDynamicAssembly(
assemblyName, AssemblyBuilderAccess.RunAndSave);
ModuleBuilder module = assembly.DefineDynamicModule("res.exe", "res.exe");
TypeBuilder genericFoo = module.DefineType ("GenericFoo", TypeAttributes.Public, typeof (object));
genericArgs = genericFoo.DefineGenericParameters ("T");
fooOpenInst = genericFoo.MakeGenericType (genericArgs);
EmitCtor (genericFoo);
EmitTargetMethod (genericFoo);
EmitTestEvents (genericFoo);
TypeBuilder moduletype = module.DefineType ("ModuleType", TypeAttributes.Public, typeof (object));
MethodBuilder main = moduletype.DefineMethod ("Main", MethodAttributes.Public | MethodAttributes.Static, typeof (void), null);
ILGenerator il = main.GetILGenerator ();
Type strInst = genericFoo.MakeGenericType (typeof (string));
il.Emit (OpCodes.Newobj, TypeBuilder.GetConstructor (strInst, ctor));
il.Emit (OpCodes.Callvirt, TypeBuilder.GetMethod (strInst, testEvents));
il.Emit (OpCodes.Ret);
genericFoo.CreateType ();
Type res = moduletype.CreateType ();
res.GetMethod ("Main").Invoke (null, null);
return 0;
}
}
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