/// <summary>
/// Create a marshaller
/// </summary>
/// <param name="parameterType">type of the parameter to marshal</param>
/// <param name="pInvokeMethodData">PInvoke Method specific marshal data</param>
/// <param name="pInvokeParameterdata">PInvoke parameter specific marshal data</param>
/// <returns>The created Marshaller</returns>
public static Marshaller CreateMarshaller(TypeDesc parameterType, PInvokeMethodData pInvokeMethodData, ParameterMetadata pInvokeParameterdata)
{
MarshallerKind marshallerKind = GetMarshallerKind(parameterType,
pInvokeParameterdata,
pInvokeMethodData,
isField: false);
// Create the marshaller based on MarshallerKind
Marshaller marshaller = Marshaller.CreateMarshallerInternal(marshallerKind);
marshaller.PInvokeMethodData = pInvokeMethodData;
marshaller.PInvokeParameterMetadata = pInvokeParameterdata;
marshaller.MarshallerKind = marshallerKind;
marshaller.NativeParameterType = null;
marshaller.ManagedParameterType = parameterType;
marshaller.Optional = pInvokeParameterdata.Optional;
marshaller.Return = pInvokeParameterdata.Return;
marshaller.IsByRef = parameterType.IsByRef;
marshaller.In = pInvokeParameterdata.In;
//
// Desktop ignores [Out] on marshaling scenarios where they don't make sense (such as passing
// value types and string as [out] without byref).
//
if (parameterType.IsByRef)
{
// Passing as [Out] by ref is valid
marshaller.Out = pInvokeParameterdata.Out;
}
else
{
// Passing as [Out] is valid only if it is not ValueType nor string
if (!parameterType.IsValueType && !parameterType.IsString)
{
marshaller.Out = pInvokeParameterdata.Out;
}
}
if (!marshaller.In && !marshaller.Out)
{
//
// Rules for in/out
// 1. ByRef args: [in]/[out] implied by default
// 2. StringBuilder: [in, out] by default
// 3. non-ByRef args: [In] is implied if no [In]/[Out] is specified
//
if (parameterType.IsByRef)
{
marshaller.In = true;
marshaller.Out = true;
}
else if (pInvokeMethodData.IsStringBuilder(parameterType))
{
marshaller.In = true;
marshaller.Out = true;
}
else
{
marshaller.In = true;
}
}
return(marshaller);
}