Appended fields

BeefLibs/corlib/src/GC.bf

@@ -149,6 +149,19 @@ namespace System
 		public static void ExcludeThreadId(int thereadId) {}
 #endif
 
+		static void MarkAppendedObject(Object obj)
+		{
+#if BF_ENABLE_REALTIME_LEAK_CHECK
+			ClassVData* maskedVData = (ClassVData*)(void*)(obj.[Friend]mClassVData & ~(int)0xFF);
+			if (maskedVData == null)
+				return;
+#else
+			if (obj.mClassVData == null)
+				return;
+#endif
+			obj.[Friend]GCMarkMembers();
+		}
+
 		static void MarkDerefedObject(Object* obj)
 		{
 #if BF_ENABLE_REALTIME_LEAK_CHECK

BeefLibs/corlib/src/Internal.bf

@@ -89,6 +89,8 @@ namespace System
 		[CallingConvention(.Cdecl), NoReturn]
 		public static extern void ThrowIndexOutOfRange(int stackOffset = 0);
 		[CallingConvention(.Cdecl), NoReturn]
+		public static extern void ThrowObjectNotInitialized(int stackOffset = 0);
+		[CallingConvention(.Cdecl), NoReturn]
 		public static extern void FatalError(String error, int stackOffset = 0);
 		[Intrinsic("memcpy")]
 		public static extern void MemCpy(void* dest, void* src, int length, int32 align = 1, bool isVolatile = false);

BeefLibs/corlib/src/Reflection/FieldInfo.bf

@@ -8,7 +8,8 @@ namespace System.Reflection
 		public enum Error
 		{
 			InvalidTargetType,
-			InvalidValueType
+			InvalidValueType,
+			AppendedField
 		}
 
 	    TypeInstance mTypeInstance;
@@ -24,6 +25,7 @@ namespace System.Reflection
 	    public int32 MemberOffset => (int32)mFieldData.mData;
 	    public Type FieldType => Type.[Friend]GetType(mFieldData.mFieldTypeId);
 		public bool IsConst => mFieldData.mFlags.HasFlag(.Const);
+		public bool IsAppended => mFieldData.mFlags.HasFlag(.Appended);
 		public bool IsEnumCase => mFieldData.mFlags.HasFlag(.EnumCase);
 		public bool IsReadOnly => mFieldData.mFlags.HasFlag(.ReadOnly);
 		public bool IsStatic => mFieldData.mFlags.HasFlag(.Static);
@@ -86,7 +88,12 @@ namespace System.Reflection
 			if (valueType == fieldType)
 			{
 				if (valueType.IsObject)
+				{
+					if (mFieldData.mFlags.HasFlag(.Appended))
+						return .Err(.AppendedField);
+
 					*((void**)dataAddr) = Internal.UnsafeCastToPtr(value);
+				}
 				else
 					Internal.MemCpy(dataAddr, valueDataAddr, fieldType.[Friend]mSize);
 			}
@@ -385,7 +392,10 @@ namespace System.Reflection
 			if (typeCode == TypeCode.Object)
 			{
 				value.[Friend]mStructType = 0;
-			    value.[Friend]mData = *(int*)targetDataAddr;
+				if (mFieldData.mFlags.HasFlag(.Appended))
+			    	value.[Friend]mData = (int)targetDataAddr;
+				else
+					value.[Friend]mData = *(int*)targetDataAddr;
 			}
 			else
 			{

BeefLibs/corlib/src/Type.bf

@@ -1480,6 +1480,7 @@ namespace System.Reflection
 		EnumDiscriminator		= 0x0200,
 		EnumCase				= 0x0400,
 		ReadOnly				= 0x0800,
+		Appended				= 0x1000,
     }
 
 	public enum MethodFlags : uint16