private static DeserializationFunc <T> CreateUnionDeserializationFunc <T>(Type[] types)
{
var deserialzationFunc = new DynamicMethod(string.Empty, typeof(T), new[] { typeof(byte[]), typeof(int), typeof(int), typeof(int), typeof(int), typeof(int).MakeByRefType() }, true);
var il = deserialzationFunc.GetILGenerator();
var index = il.DeclareLocal(typeof(int));
var indexSize = il.DeclareLocal(typeof(int));
var objectSize = il.DeclareLocal(typeof(int));
var result = il.DeclareLocal(typeof(T));
il.EmitLoadArgument(0);
il.EmitLoadArgument(1);
il.EmitLoadArgument(2);
il.EmitLoadLocalAddress(indexSize.LocalIndex);
il.Emit(OpCodes.Call, typeof(Binary).GetMethod(nameof(Binary.InternalRead7BitEncodedInt32), BindingFlagsEx.Static));
il.EmitStoreLocal(index.LocalIndex);
{
var validIndex = il.DefineLabel();
il.EmitLoadLocal(index.LocalIndex);
il.EmitLoadDeclaredConstant(types.Length);
il.Emit(OpCodes.Ble_S, validIndex);
il.Emit(OpCodes.Ldstr, "Failed to deserialize the object, because its union index was out of bounds.");
il.Emit(OpCodes.Newobj, typeof(SerializationException).GetConstructor(new[] { typeof(string) }));
il.Emit(OpCodes.Throw);
il.MarkLabel(validIndex);
}
{
var valueNotNull = il.DefineLabel();
il.EmitLoadLocal(result.LocalIndex);
il.Emit(OpCodes.Brtrue_S, valueNotNull);
il.EmitLoadArgument(5);
il.EmitLoadLocal(indexSize.LocalIndex);
il.Emit(OpCodes.Stind_I4);
il.Emit(OpCodes.Ldnull);
il.Emit(OpCodes.Ret);
il.MarkLabel(valueNotNull);
}
il.EmitLoadArgument(1);
il.EmitLoadLocal(indexSize.LocalIndex);
il.Emit(OpCodes.Add);
il.EmitStoreArgument(1);
il.EmitLoadArgument(2);
il.EmitLoadLocal(indexSize.LocalIndex);
il.Emit(OpCodes.Sub);
il.EmitStoreArgument(2);
il.EmitLoadLocal(index.LocalIndex);
il.EmitLoadDeclaredConstant(1);
il.Emit(OpCodes.Sub);
il.EmitStoreLocal(index.LocalIndex);
var jumpTable = new Label[types.Length];
var endOfSwitch = il.DefineLabel();
for (var i = 0; i < types.Length; i++)
{
jumpTable[i] = il.DefineLabel();
}
il.EmitLoadLocal(index.LocalIndex);
il.Emit(OpCodes.Switch, jumpTable);
for (var i = 0; i < types.Length; i++)
{
var type = types[i];
il.MarkLabel(jumpTable[i]);
GenericFormatter.EmitLoadCachedInstance(il, type);
il.EmitLoadArgument(0);
il.EmitLoadArgument(1);
il.EmitLoadArgument(2);
il.EmitLoadArgument(3);
il.EmitLoadArgument(4);
il.EmitLoadLocalAddress(objectSize.LocalIndex);
GenericFormatter.EmitDeserialize(il, type);
if (type.IsValueType)
{
il.Emit(OpCodes.Box, type);
}
il.EmitStoreLocal(result.LocalIndex);
il.Emit(OpCodes.Br, endOfSwitch);
}
il.MarkLabel(endOfSwitch);
il.EmitLoadArgument(5);
il.EmitLoadLocal(indexSize.LocalIndex);
il.EmitLoadLocal(objectSize.LocalIndex);
il.Emit(OpCodes.Add);
il.Emit(OpCodes.Stind_I4);
il.EmitLoadLocal(result.LocalIndex);
il.Emit(OpCodes.Ret);
return((DeserializationFunc <T>)deserialzationFunc.CreateDelegate(typeof(DeserializationFunc <T>)));
}
private static void DeserializeField(ILGenerator il, FieldInfo field, LocalBuilder size)
{
var type = PrimitiveTypes.GetPrimitiveType(field.FieldType);
if (type == PrimitiveType.NotPrimitive)
{
GenericFormatter.EmitLoadCachedInstance(il, field.FieldType);
}
il.EmitLoadArgument(0);
il.EmitLoadArgument(1);
il.EmitLoadArgument(2);
il.EmitLoadLocalAddress(size.LocalIndex);
switch (type)
{
case PrimitiveType.NotPrimitive:
il.EmitLoadArgument(4);
il.EmitLoadArgument(5);
GenericFormatter.EmitDeserialize(il, field.FieldType);
break;
case PrimitiveType.SByte:
il.Emit(OpCodes.Call, typeof(Binary).GetMethod(nameof(Binary.InternalReadSByte), BindingFlagsEx.Static));
break;
case PrimitiveType.Byte:
il.Emit(OpCodes.Call, typeof(Binary).GetMethod(nameof(Binary.InternalReadByte), BindingFlagsEx.Static));
break;
case PrimitiveType.Int16:
il.Emit(OpCodes.Call, typeof(Binary).GetMethod(nameof(Binary.InternalReadInt16), BindingFlagsEx.Static));
break;
case PrimitiveType.UInt16:
il.Emit(OpCodes.Call, typeof(Binary).GetMethod(nameof(Binary.InternalReadUInt16), BindingFlagsEx.Static));
break;
case PrimitiveType.Int32:
il.Emit(OpCodes.Call, typeof(Binary).GetMethod(nameof(Binary.InternalRead7BitEncodedInt32), BindingFlagsEx.Static));
break;
case PrimitiveType.UInt32:
il.Emit(OpCodes.Call, typeof(Binary).GetMethod(nameof(Binary.InternalRead7BitEncodedUInt32), BindingFlagsEx.Static));
break;
case PrimitiveType.Int64:
il.Emit(OpCodes.Call, typeof(Binary).GetMethod(nameof(Binary.InternalRead7BitEncodedInt64), BindingFlagsEx.Static));
break;
case PrimitiveType.UInt64:
il.Emit(OpCodes.Call, typeof(Binary).GetMethod(nameof(Binary.InternalRead7BitEncodedUInt64), BindingFlagsEx.Static));
break;
case PrimitiveType.Boolean:
il.Emit(OpCodes.Call, typeof(Binary).GetMethod(nameof(Binary.InternalReadBoolean), BindingFlagsEx.Static));
break;
case PrimitiveType.Char:
il.Emit(OpCodes.Call, typeof(Binary).GetMethod(nameof(Binary.InternalReadChar), BindingFlagsEx.Static));
break;
case PrimitiveType.Single:
il.Emit(OpCodes.Call, typeof(Binary).GetMethod(nameof(Binary.InternalReadSingle), BindingFlagsEx.Static));
break;
case PrimitiveType.Double:
il.Emit(OpCodes.Call, typeof(Binary).GetMethod(nameof(Binary.InternalReadDouble), BindingFlagsEx.Static));
break;
default:
Debug.Assert(false);
break;
}
}