private static OpCode GetStindInstruction(System.Type parameterType)
{
if (parameterType.IsByRef)
{
OpCode stindOpCode;
if(OpCodesMap.TryGetStindOpCode(parameterType.GetElementType(), out stindOpCode))
{
return stindOpCode;
}
}
return OpCodes.Stind_Ref;
}
private static void SaveRefArguments(ILGenerator IL, ParameterInfo[] parameters)
{
// Save the arguments returned from the handler method
IL.Emit(OpCodes.Ldloc_1);
IL.Emit(OpCodes.Call, getArguments);
IL.Emit(OpCodes.Stloc_0);
foreach (ParameterInfo param in parameters)
{
string typeName = param.ParameterType.Name;
bool isRef = param.ParameterType.IsByRef && typeName.EndsWith("&");
if (!isRef)
{
continue;
}
// Load the destination address
IL.Emit(OpCodes.Ldarg, param.Position + 1);
// Load the argument value
IL.Emit(OpCodes.Ldloc_0);
IL.Emit(OpCodes.Ldc_I4, param.Position);
IL.Emit(OpCodes.Ldelem_Ref);
System.Type unboxedType = param.ParameterType.GetElementType();
IL.Emit(OpCodes.Unbox_Any, unboxedType);
if (Nullable.GetUnderlyingType(unboxedType) != null)
{
IL.Emit(OpCodes.Stobj, unboxedType);
}
else if (OpCodesMap.TryGetStindOpCode(param.ParameterType.GetElementType(), out var stind))
{
IL.Emit(stind);
}
else
{
IL.Emit(OpCodes.Stind_Ref);
}
}
}
public void PushArguments(ParameterInfo[] methodParameters, ILGenerator IL, bool isStatic)
{
ParameterInfo[] parameters = methodParameters ?? Array.Empty <ParameterInfo>();
int parameterCount = parameters.Length;
// object[] args = new object[size];
IL.Emit(OpCodes.Ldc_I4, parameterCount);
IL.Emit(OpCodes.Newarr, typeof(object));
IL.Emit(OpCodes.Stloc_S, 0);
if (parameterCount == 0)
{
IL.Emit(OpCodes.Ldloc_S, 0);
return;
}
// Populate the object array with the list of arguments
int index = 0;
int argumentPosition = 1;
foreach (ParameterInfo param in parameters)
{
System.Type parameterType = param.ParameterType.IsByRef ? param.ParameterType.GetElementType() : param.ParameterType;
// args[N] = argumentN (pseudocode)
IL.Emit(OpCodes.Ldloc_S, 0);
IL.Emit(OpCodes.Ldc_I4, index);
// Zero out the [out] parameters
if (param.IsOut)
{
IL.Emit(OpCodes.Ldnull);
IL.Emit(OpCodes.Stelem_Ref);
argumentPosition++;
index++;
continue;
}
IL.Emit(OpCodes.Ldarg, argumentPosition);
if (param.ParameterType.IsByRef)
{
var unboxedType = param.ParameterType.GetElementType();
if (Nullable.GetUnderlyingType(unboxedType) != null)
{
IL.Emit(OpCodes.Ldobj, unboxedType);
}
else if (OpCodesMap.TryGetLdindOpCode(unboxedType, out var ldind))
{
IL.Emit(ldind);
}
else
{
IL.Emit(OpCodes.Ldind_Ref);
}
}
if (parameterType.IsValueType || param.ParameterType.IsByRef || parameterType.IsGenericParameter)
{
IL.Emit(OpCodes.Box, parameterType);
}
IL.Emit(OpCodes.Stelem_Ref);
index++;
argumentPosition++;
}
IL.Emit(OpCodes.Ldloc_S, 0);
}