private LocalBuilder UnwrapNullableObject(LocalBuilder memberValue)// Leaves !HasValue on stack
{
Type memberType = memberValue.LocalType;
Label onNull = _ilg.DefineLabel();
Label end = _ilg.DefineLabel();
_ilg.LoadAddress(memberValue);
while (memberType.GetTypeInfo().IsGenericType && memberType.GetGenericTypeDefinition() == Globals.TypeOfNullable)
{
Type innerType = memberType.GetGenericArguments()[0];
_ilg.Dup();
_ilg.Call(typeof(Nullable<>).MakeGenericType(innerType).GetMethod("get_HasValue"));
_ilg.Brfalse(onNull);
_ilg.Call(typeof(Nullable<>).MakeGenericType(innerType).GetMethod("get_Value"));
memberType = innerType;
}
memberValue = _ilg.DeclareLocal(memberType, "nullableUnwrappedMemberValue");
_ilg.Stloc(memberValue);
_ilg.Load(false); //isNull
_ilg.Br(end);
_ilg.MarkLabel(onNull);
_ilg.Pop();
_ilg.LoadAddress(memberValue);
_ilg.InitObj(memberType);
_ilg.Load(true); //isNull
_ilg.MarkLabel(end);
return memberValue;
}