private static void CreateTupleUnpackFrom(SerializerEmitter emitter, IList <Type> itemTypes)
{
var il = emitter.GetUnpackFromMethodILGenerator();
var localHolder = new LocalVariableHolder(il);
try
{
/*
* checked
* {
* if (!unpacker.IsArrayHeader)
* {
* throw SerializationExceptions.NewIsNotArrayHeader();
* }
*
* if ((int)unpacker.ItemsCount != n)
* {
* throw SerializationExceptions.NewTupleCardinarityIsNotMatch(n, (int)unpacker.ItemsCount);
* }
*
* if (!unpacker.Read())
* {
* throw SerializationExceptions.NewMissingItem(0);
* }
*
* DESERIALIZE_VALUE
*
* :
*
* return new Tuple<...>( item1, ... , new Tuple<...>(...)...);
* }
*/
il.EmitAnyLdarg(1);
il.EmitGetProperty(Metadata._Unpacker.IsArrayHeader);
var endIf = il.DefineLabel("END_IF");
il.EmitBrtrue_S(endIf);
il.EmitAnyCall(SerializationExceptions.NewIsNotArrayHeaderMethod);
il.EmitThrow();
il.MarkLabel(endIf);
var itemsCount = localHolder.ItemsCount;
Emittion.EmitGetUnpackerItemsCountAsInt32(il, 1, localHolder);
il.EmitAnyLdc_I4(itemTypes.Count);
il.EmitAnyStloc(itemsCount);
il.EmitAnyLdloc(itemsCount);
var endIf1 = il.DefineLabel("END_IF1");
il.EmitBeq_S(endIf1);
il.EmitAnyLdc_I4(itemTypes.Count);
il.EmitAnyLdloc(itemsCount);
il.EmitAnyCall(SerializationExceptions.NewTupleCardinarityIsNotMatchMethod);
il.EmitThrow();
il.MarkLabel(endIf1);
var itemLocals = new LocalBuilder[itemTypes.Count];
var useDummyNullables = new bool[itemTypes.Count];
for (int i = 0; i < itemTypes.Count; i++)
{
if (itemTypes[i] != typeof(MessagePackObject) &&
itemTypes[i].GetIsValueType() &&
Nullable.GetUnderlyingType(itemTypes[i]) == null)
{
// Use temporary nullable value for nil implication.
itemLocals[i] = il.DeclareLocal(typeof(Nullable <>).MakeGenericType(itemTypes[i]), "item" + i.ToString(CultureInfo.InvariantCulture));
useDummyNullables[i] = true;
}
else
{
itemLocals[i] = il.DeclareLocal(itemTypes[i], "item" + i.ToString(CultureInfo.InvariantCulture));
}
// Tuple member should be NilImplication.MemberDefault.
Emittion.EmitDeserializeValueWithoutNilImplication(emitter, il, 1, itemLocals[i], typeof(Tuple), "Item" + (i).ToString(CultureInfo.InvariantCulture), localHolder);
}
for (int i = 0; i < itemLocals.Length; i++)
{
if (useDummyNullables[i])
{
il.EmitAnyLdloca(itemLocals[i]);
il.EmitGetProperty(typeof(Nullable <>).MakeGenericType(itemTypes[i]).GetProperty("Value"));
}
else
{
il.EmitAnyLdloc(itemLocals[i]);
}
}
var tupleTypeList = TupleItems.CreateTupleTypeList(itemTypes);
for (int depth = tupleTypeList.Count - 1; 0 <= depth; depth--)
{
il.EmitNewobj(tupleTypeList[depth].GetConstructors().Single());
}
il.EmitRet();
}
finally
{
il.FlushTrace();
}
}