public static DynamicMethod GenerateStubForMethod(MethodInfo methodInfo)
{
ParameterInfo[] parameters = methodInfo.GetParameters();
List <Type> signatureParamTypes = new List <Type>();
List <Type> parameterTypes = new List <Type>();
if (!methodInfo.IsStatic)
{
if (methodInfo.IsForValueType())
{
signatureParamTypes.Add(methodInfo.DeclaringType.MakeByRefType());
}
else
{
signatureParamTypes.Add(methodInfo.DeclaringType);
}
}
signatureParamTypes.AddRange(parameters.Select(p => p.ParameterType));
parameterTypes.AddRange(signatureParamTypes);
parameterTypes.Add(typeof(RuntimeMethodHandle));
parameterTypes.Add(typeof(RuntimeTypeHandle));
DynamicMethod stub = new DynamicMethod(
string.Format("stub_{0}_{1}", methodInfo.DeclaringType, methodInfo.Name),
methodInfo.ReturnType,
parameterTypes.ToArray(),
StubHelper.GetOwningModule(),
true);
ILGenerator ilGenerator = stub.GetILGenerator();
ilGenerator.DeclareLocal(typeof(MethodInfo));
ilGenerator.DeclareLocal(typeof(int));
ilGenerator.DeclareLocal(typeof(IntPtr));
Label rewriteLabel = ilGenerator.DefineLabel();
Label returnLabel = ilGenerator.DefineLabel();
ilGenerator.Emit(OpCodes.Ldarg, parameterTypes.Count - 2);
ilGenerator.Emit(OpCodes.Ldarg, parameterTypes.Count - 1);
ilGenerator.Emit(OpCodes.Call, typeof(MethodBase).GetMethod("GetMethodFromHandle", new Type[] { typeof(RuntimeMethodHandle), typeof(RuntimeTypeHandle) }));
ilGenerator.Emit(OpCodes.Castclass, typeof(MethodInfo));
ilGenerator.Emit(OpCodes.Stloc_0);
ilGenerator.Emit(OpCodes.Ldloc_0);
ilGenerator.Emit(methodInfo.IsStatic || methodInfo.IsForValueType() ? OpCodes.Ldnull : OpCodes.Ldarg_0);
ilGenerator.Emit(OpCodes.Call, typeof(StubHelper).GetMethod("GetIndexOfMatchingShim", new Type[] { typeof(MethodBase), typeof(Object) }));
ilGenerator.Emit(OpCodes.Stloc_1);
ilGenerator.Emit(OpCodes.Ldloc_1);
ilGenerator.Emit(OpCodes.Ldc_I4_M1);
ilGenerator.Emit(OpCodes.Ceq);
ilGenerator.Emit(OpCodes.Brtrue_S, rewriteLabel);
var methodBase = StubHelper.GetShimReplacementMethod(StubHelper.GetIndexOfMatchingShim(methodInfo as MethodBase, null));
if (StubHelper.MethodBaseIsShimmyDynamic(methodBase))
{
var dynamicMethod = StubHelper.GetDynamicMethodFromDynamicMethodBase(methodBase);
EmitArguments(ilGenerator, signatureParamTypes);
ilGenerator.EmitCall(OpCodes.Call, dynamicMethod, null);
}
else
{
// do things the classic Pose way
ilGenerator.Emit(OpCodes.Ldloc_1);
ilGenerator.Emit(OpCodes.Call, typeof(StubHelper).GetMethod("GetShimReplacementMethod"));
ilGenerator.Emit(OpCodes.Stloc_0);
ilGenerator.Emit(OpCodes.Ldloc_0);
ilGenerator.Emit(OpCodes.Call, typeof(StubHelper).GetMethod("GetMethodPointer"));
ilGenerator.Emit(OpCodes.Stloc_2);
ilGenerator.Emit(OpCodes.Ldloc_1);
ilGenerator.Emit(OpCodes.Call, typeof(StubHelper).GetMethod("GetShimDelegateTarget"));
EmitArguments(ilGenerator, signatureParamTypes);
ilGenerator.Emit(OpCodes.Ldloc_2);
ilGenerator.EmitCalli(OpCodes.Calli, CallingConventions.HasThis, methodInfo.ReturnType, signatureParamTypes.ToArray(), null);
}
ilGenerator.Emit(OpCodes.Br_S, returnLabel);
ilGenerator.MarkLabel(rewriteLabel);
ilGenerator.Emit(OpCodes.Ldloc_0);
ilGenerator.Emit(OpCodes.Call, typeof(MethodRewriter).GetMethod("CreateRewriter", new Type[] { typeof(MethodBase) }));
ilGenerator.Emit(OpCodes.Call, typeof(MethodRewriter).GetMethod("Rewrite"));
ilGenerator.Emit(OpCodes.Castclass, typeof(MethodInfo));
ilGenerator.Emit(OpCodes.Stloc_0);
for (int i = 0; i < signatureParamTypes.Count; i++)
{
ilGenerator.Emit(OpCodes.Ldarg, i);
}
ilGenerator.Emit(OpCodes.Ldloc_0);
ilGenerator.Emit(OpCodes.Call, typeof(StubHelper).GetMethod("GetMethodPointer"));
ilGenerator.EmitCalli(OpCodes.Calli, CallingConventions.Standard, methodInfo.ReturnType, signatureParamTypes.ToArray(), null);
ilGenerator.MarkLabel(returnLabel);
ilGenerator.Emit(OpCodes.Ret);
return(stub);
}