/// <summary>
/// Returns a boolean value if we can determine whether the type is managed
/// without looking at its fields and Unset otherwise.
/// </summary>
private static (ThreeState isManaged, bool hasGenerics) IsManagedTypeHelper(NamedTypeSymbol type)
{
// To match dev10, we treat enums as their underlying types.
if (type.IsEnumType())
{
type = type.GetEnumUnderlyingType();
}
bool hasGenerics = type.TupleUnderlyingTypeOrSelf().GetArity() > 0;
// Short-circuit common cases.
switch (type.SpecialType)
{
case SpecialType.System_Void:
case SpecialType.System_Boolean:
case SpecialType.System_Char:
case SpecialType.System_Int8:
case SpecialType.System_UInt8:
case SpecialType.System_Int16:
case SpecialType.System_UInt16:
case SpecialType.System_Int32:
case SpecialType.System_UInt32:
case SpecialType.System_Int64:
case SpecialType.System_UInt64:
case SpecialType.System_Decimal:
case SpecialType.System_Float32:
case SpecialType.System_Float64:
case SpecialType.System_Int:
case SpecialType.System_UInt:
case SpecialType.System_TypedReference:
case SpecialType.System_ArgIterator:
case SpecialType.System_RuntimeArgumentHandle:
return(ThreeState.False, hasGenerics);
case SpecialType.None:
default:
// CONSIDER: could provide cases for other common special types.
break; // Proceed with additional checks.
}
switch (type.TypeKind)
{
case TypeKind.Enum:
return(ThreeState.False, hasGenerics);
case TypeKind.Struct:
return(ThreeState.Unknown, hasGenerics);
default:
return(ThreeState.True, hasGenerics);
}
}