// this helper prepares arguments for COM binding by transforming ByVal StongBox arguments
// into ByRef expressions that represent the argument's Value fields.
internal static bool[] ProcessArgumentsForCom(ComMethodDesc method, ref DynamicMetaObject[] args,
List <ParameterExpression> temps, List <Expression> initTemps)
{
Debug.Assert(args != null);
DynamicMetaObject[] newArgs = new DynamicMetaObject[args.Length];
bool[] isByRefArg = new bool[args.Length];
for (int i = 0; i < args.Length; i++)
{
DynamicMetaObject curArgument = args[i];
// set new arg infos to their original values or set default ones
// we will do this fixup early so that we can assume we always have
// arginfos in COM binder.
if (IsByRef(curArgument))
{
newArgs[i] = curArgument;
isByRefArg[i] = true;
}
else
{
if (IsPSReferenceArg(curArgument))
{
var restrictions = curArgument.Restrictions.Merge(
GetTypeRestrictionForDynamicMetaObject(curArgument)
);
// we have restricted this argument to LimitType so we can convert and conversion will be trivial cast.
Expression boxedValueAccessor = Expression.Property(
Helpers.Convert(
curArgument.Expression,
curArgument.LimitType
),
curArgument.LimitType.GetProperty("Value")
);
PSReference value = curArgument.Value as PSReference;
object boxedValue = value != null ? value.Value : null;
newArgs[i] = new DynamicMetaObject(
boxedValueAccessor,
restrictions,
boxedValue
);
isByRefArg[i] = true;
}
else
{
if ((method.ParameterInformation != null) && (i < method.ParameterInformation.Length))
{
newArgs[i] = new DynamicMetaObject(curArgument.CastOrConvertMethodArgument(
method.ParameterInformation[i].parameterType,
i.ToString(CultureInfo.InvariantCulture),
method.Name,
temps,
initTemps), curArgument.Restrictions);
}
else
{
newArgs[i] = curArgument;
}
isByRefArg[i] = false;
}
}
}
args = newArgs;
return(isByRefArg);
}
