internal static MarshallerKind GetMarshallerKind(
TypeDesc type,
MarshalAsDescriptor marshalAs,
bool isReturn,
bool isAnsi,
MarshallerType marshallerType,
out MarshallerKind elementMarshallerKind)
{
if (type.IsByRef)
{
type = type.GetParameterType();
}
TypeSystemContext context = type.Context;
NativeTypeKind nativeType = NativeTypeKind.Invalid;
bool isField = marshallerType == MarshallerType.Field;
if (marshalAs != null)
{
nativeType = (NativeTypeKind)marshalAs.Type;
}
elementMarshallerKind = MarshallerKind.Invalid;
//
// Determine MarshalerKind
//
// This mostly resembles desktop CLR and .NET Native code as we need to match their behavior
//
if (type.IsPrimitive)
{
switch (type.Category)
{
case TypeFlags.Void:
return(MarshallerKind.VoidReturn);
case TypeFlags.Boolean:
switch (nativeType)
{
case NativeTypeKind.Invalid:
case NativeTypeKind.Boolean:
return(MarshallerKind.Bool);
case NativeTypeKind.U1:
case NativeTypeKind.I1:
return(MarshallerKind.CBool);
default:
return(MarshallerKind.Invalid);
}
case TypeFlags.Char:
switch (nativeType)
{
case NativeTypeKind.I1:
case NativeTypeKind.U1:
return(MarshallerKind.AnsiChar);
case NativeTypeKind.I2:
case NativeTypeKind.U2:
return(MarshallerKind.UnicodeChar);
case NativeTypeKind.Invalid:
if (isAnsi)
{
return(MarshallerKind.AnsiChar);
}
else
{
return(MarshallerKind.UnicodeChar);
}
default:
return(MarshallerKind.Invalid);
}
case TypeFlags.SByte:
case TypeFlags.Byte:
if (nativeType == NativeTypeKind.I1 || nativeType == NativeTypeKind.U1 || nativeType == NativeTypeKind.Invalid)
{
return(MarshallerKind.BlittableValue);
}
else
{
return(MarshallerKind.Invalid);
}
case TypeFlags.Int16:
case TypeFlags.UInt16:
if (nativeType == NativeTypeKind.I2 || nativeType == NativeTypeKind.U2 || nativeType == NativeTypeKind.Invalid)
{
return(MarshallerKind.BlittableValue);
}
else
{
return(MarshallerKind.Invalid);
}
case TypeFlags.Int32:
case TypeFlags.UInt32:
if (nativeType == NativeTypeKind.I4 || nativeType == NativeTypeKind.U4 || nativeType == NativeTypeKind.Invalid)
{
return(MarshallerKind.BlittableValue);
}
else
{
return(MarshallerKind.Invalid);
}
case TypeFlags.Int64:
case TypeFlags.UInt64:
if (nativeType == NativeTypeKind.I8 || nativeType == NativeTypeKind.U8 || nativeType == NativeTypeKind.Invalid)
{
return(MarshallerKind.BlittableValue);
}
else
{
return(MarshallerKind.Invalid);
}
case TypeFlags.IntPtr:
case TypeFlags.UIntPtr:
if (nativeType == NativeTypeKind.Invalid)
{
return(MarshallerKind.BlittableValue);
}
else
{
return(MarshallerKind.Invalid);
}
case TypeFlags.Single:
if (nativeType == NativeTypeKind.R4 || nativeType == NativeTypeKind.Invalid)
{
return(MarshallerKind.BlittableValue);
}
else
{
return(MarshallerKind.Invalid);
}
case TypeFlags.Double:
if (nativeType == NativeTypeKind.R8 || nativeType == NativeTypeKind.Invalid)
{
return(MarshallerKind.BlittableValue);
}
else
{
return(MarshallerKind.Invalid);
}
default:
return(MarshallerKind.Invalid);
}
}
else if (type.IsValueType)
{
if (type.IsEnum)
{
return(MarshallerKind.Enum);
}
if (InteropTypes.IsSystemDateTime(context, type))
{
if (nativeType == NativeTypeKind.Invalid ||
nativeType == NativeTypeKind.Struct)
{
return(MarshallerKind.OleDateTime);
}
else
{
return(MarshallerKind.Invalid);
}
}
/*
* TODO: Bring HandleRef to CoreLib
* https://github.com/dotnet/corert/issues/2570
*
* else if (context.IsHandleRef(type))
* {
* if (nativeType == NativeType.Invalid)
* return MarshallerKind.HandleRef;
* else
* return MarshallerKind.Invalid;
* }
*/
switch (nativeType)
{
case NativeTypeKind.Invalid:
case NativeTypeKind.Struct:
if (InteropTypes.IsSystemDecimal(context, type))
{
return(MarshallerKind.Decimal);
}
break;
case NativeTypeKind.LPStruct:
if (InteropTypes.IsSystemGuid(context, type) ||
InteropTypes.IsSystemDecimal(context, type))
{
if (isField || isReturn)
{
return(MarshallerKind.Invalid);
}
else
{
return(MarshallerKind.BlittableStructPtr);
}
}
break;
default:
return(MarshallerKind.Invalid);
}
if (type is MetadataType)
{
MetadataType metadataType = (MetadataType)type;
// the struct type need to be either sequential or explicit. If it is
// auto layout we will throw exception.
if (!metadataType.IsSequentialLayout && !metadataType.IsExplicitLayout)
{
throw new InvalidProgramException("The specified structure " + metadataType.Name + " has invalid StructLayout information. It must be either Sequential or Explicit.");
}
}
if (MarshalHelpers.IsBlittableType(type))
{
return(MarshallerKind.BlittableStruct);
}
else
{
return(MarshallerKind.Struct);
}
}
else // !ValueType
{
if (type.Category == TypeFlags.Class)
{
if (type.IsString)
{
switch (nativeType)
{
case NativeTypeKind.LPWStr:
return(MarshallerKind.UnicodeString);
case NativeTypeKind.LPStr:
return(MarshallerKind.AnsiString);
case NativeTypeKind.LPTStr:
return(MarshallerKind.UnicodeString);
case NativeTypeKind.ByValTStr:
if (isAnsi)
{
elementMarshallerKind = MarshallerKind.AnsiChar;
return(MarshallerKind.ByValAnsiString);
}
else
{
elementMarshallerKind = MarshallerKind.UnicodeChar;
return(MarshallerKind.ByValUnicodeString);
}
case NativeTypeKind.Invalid:
if (isAnsi)
{
return(MarshallerKind.AnsiString);
}
else
{
return(MarshallerKind.UnicodeString);
}
default:
return(MarshallerKind.Invalid);
}
}
else if (type.IsDelegate)
{
if (nativeType == NativeTypeKind.Invalid || nativeType == NativeTypeKind.Func)
{
return(MarshallerKind.FunctionPointer);
}
else
{
return(MarshallerKind.Invalid);
}
}
else if (type.IsObject)
{
if (nativeType == NativeTypeKind.Invalid)
{
return(MarshallerKind.Variant);
}
else
{
return(MarshallerKind.Invalid);
}
}
else if (InteropTypes.IsStringBuilder(context, type))
{
switch (nativeType)
{
case NativeTypeKind.Invalid:
if (isAnsi)
{
return(MarshallerKind.AnsiStringBuilder);
}
else
{
return(MarshallerKind.UnicodeStringBuilder);
}
case NativeTypeKind.LPStr:
return(MarshallerKind.AnsiStringBuilder);
case NativeTypeKind.LPWStr:
return(MarshallerKind.UnicodeStringBuilder);
default:
return(MarshallerKind.Invalid);
}
}
else if (InteropTypes.IsSafeHandle(context, type))
{
if (nativeType == NativeTypeKind.Invalid)
{
return(MarshallerKind.SafeHandle);
}
else
{
return(MarshallerKind.Invalid);
}
}
/*
* TODO: Bring CriticalHandle to CoreLib
* https://github.com/dotnet/corert/issues/2570
*
* else if (InteropTypes.IsCriticalHandle(context, type))
* {
* if (nativeType != NativeType.Invalid || isField)
* {
* return MarshallerKind.Invalid;
* }
* else
* {
* return MarshallerKind.CriticalHandle;
* }
* }
*/
return(MarshallerKind.Invalid);
}
else if (InteropTypes.IsSystemArray(context, type))
{
return(MarshallerKind.Invalid);
}
else if (type.IsSzArray)
{
if (nativeType == NativeTypeKind.Invalid)
{
nativeType = NativeTypeKind.Array;
}
switch (nativeType)
{
case NativeTypeKind.Array:
{
if (isField || isReturn)
{
return(MarshallerKind.Invalid);
}
var arrayType = (ArrayType)type;
elementMarshallerKind = GetArrayElementMarshallerKind(
arrayType,
marshalAs,
isAnsi);
// If element is invalid type, the array itself is invalid
if (elementMarshallerKind == MarshallerKind.Invalid)
{
return(MarshallerKind.Invalid);
}
if (elementMarshallerKind == MarshallerKind.AnsiChar)
{
return(MarshallerKind.AnsiCharArray);
}
else if (elementMarshallerKind == MarshallerKind.UnicodeChar || // Arrays of unicode char should be marshalled as blittable arrays
elementMarshallerKind == MarshallerKind.Enum ||
elementMarshallerKind == MarshallerKind.BlittableValue)
{
return(MarshallerKind.BlittableArray);
}
else
{
return(MarshallerKind.Array);
}
}
case NativeTypeKind.ByValArray: // fix sized array
{
var arrayType = (ArrayType)type;
elementMarshallerKind = GetArrayElementMarshallerKind(
arrayType,
marshalAs,
isAnsi);
// If element is invalid type, the array itself is invalid
if (elementMarshallerKind == MarshallerKind.Invalid)
{
return(MarshallerKind.Invalid);
}
if (elementMarshallerKind == MarshallerKind.AnsiChar)
{
return(MarshallerKind.ByValAnsiCharArray);
}
else
{
return(MarshallerKind.ByValArray);
}
}
default:
return(MarshallerKind.Invalid);
}
}
else if (type.Category == TypeFlags.Pointer)
{
//
// @TODO - add checks for the pointee type in case the pointee type is not blittable
// C# already does this and will emit compilation errors (can't declare pointers to
// managed type).
//
if (nativeType == NativeTypeKind.Invalid)
{
return(MarshallerKind.BlittableValue);
}
else
{
return(MarshallerKind.Invalid);
}
}
}
return(MarshallerKind.Invalid);
}