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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System;
using System.Collections;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;
using System.Reflection;
using System.Reflection.Emit;
using System.Runtime.CompilerServices;
using System.Runtime.Serialization.DataContracts;
using System.Security;
using System.Xml;
using System.Xml.Schema;
namespace System.Runtime.Serialization
{
internal delegate object? XmlFormatClassReaderDelegate(XmlReaderDelegator xmlReader, XmlObjectSerializerReadContext? context, XmlDictionaryString[]? memberNames, XmlDictionaryString[]? memberNamespaces);
internal delegate object XmlFormatCollectionReaderDelegate(XmlReaderDelegator xmlReader, XmlObjectSerializerReadContext context, XmlDictionaryString itemName, XmlDictionaryString itemNamespace, CollectionDataContract collectionContract);
internal delegate void XmlFormatGetOnlyCollectionReaderDelegate(XmlReaderDelegator xmlReader, XmlObjectSerializerReadContext context, XmlDictionaryString itemName, XmlDictionaryString itemNamespace, CollectionDataContract collectionContract);
internal sealed class XmlFormatReaderGenerator
{
private readonly CriticalHelper _helper;
public XmlFormatReaderGenerator()
{
_helper = new CriticalHelper();
}
[RequiresDynamicCode(DataContract.SerializerAOTWarning)]
[RequiresUnreferencedCode(DataContract.SerializerTrimmerWarning)]
public XmlFormatClassReaderDelegate GenerateClassReader(ClassDataContract classContract)
{
return _helper.GenerateClassReader(classContract);
}
[RequiresDynamicCode(DataContract.SerializerAOTWarning)]
[RequiresUnreferencedCode(DataContract.SerializerTrimmerWarning)]
public XmlFormatCollectionReaderDelegate GenerateCollectionReader(CollectionDataContract collectionContract)
{
return _helper.GenerateCollectionReader(collectionContract);
}
[RequiresDynamicCode(DataContract.SerializerAOTWarning)]
[RequiresUnreferencedCode(DataContract.SerializerTrimmerWarning)]
public XmlFormatGetOnlyCollectionReaderDelegate GenerateGetOnlyCollectionReader(CollectionDataContract collectionContract)
{
return _helper.GenerateGetOnlyCollectionReader(collectionContract);
}
/// <SecurityNote>
/// Review - handles all aspects of IL generation including initializing the DynamicMethod.
/// changes to how IL generated could affect how data is deserialized and what gets access to data,
/// therefore we mark it for review so that changes to generation logic are reviewed.
/// </SecurityNote>
private sealed class CriticalHelper
{
private CodeGenerator _ilg = null!; // initialized in GenerateXXXReader
private LocalBuilder? _objectLocal;
private Type? _objectType;
private ArgBuilder _xmlReaderArg = null!; // initialized in InitArgs
private ArgBuilder _contextArg = null!; // initialized in InitArgs
private ArgBuilder _memberNamesArg = null!; // initialized in InitArgs
private ArgBuilder _memberNamespacesArg = null!; // initialized in InitArgs
private ArgBuilder? _collectionContractArg;
[RequiresDynamicCode(DataContract.SerializerAOTWarning)]
[RequiresUnreferencedCode(DataContract.SerializerTrimmerWarning)]
private static XmlFormatClassReaderDelegate CreateReflectionXmlClassReader(ClassDataContract classContract)
{
return new ReflectionXmlClassReader(classContract).ReflectionReadClass;
}
[RequiresDynamicCode(DataContract.SerializerAOTWarning)]
[RequiresUnreferencedCode(DataContract.SerializerTrimmerWarning)]
public XmlFormatClassReaderDelegate GenerateClassReader(ClassDataContract classContract)
{
if (DataContractSerializer.Option == SerializationOption.ReflectionOnly)
{
return CreateReflectionXmlClassReader(classContract);
}
else
{
_ilg = new CodeGenerator();
bool memberAccessFlag = classContract.RequiresMemberAccessForRead(null);
try
{
_ilg.BeginMethod("Read" + classContract.XmlName.Name + "FromXml", Globals.TypeOfXmlFormatClassReaderDelegate, memberAccessFlag);
}
catch (SecurityException securityException)
{
if (memberAccessFlag)
{
classContract.RequiresMemberAccessForRead(securityException);
}
else
{
throw;
}
}
InitArgs();
CreateObject(classContract);
_ilg.Call(_contextArg, XmlFormatGeneratorStatics.AddNewObjectMethod, _objectLocal);
InvokeOnDeserializing(classContract);
LocalBuilder? objectId = null;
if (HasFactoryMethod(classContract))
{
objectId = _ilg.DeclareLocal(Globals.TypeOfString);
_ilg.Call(_contextArg, XmlFormatGeneratorStatics.GetObjectIdMethod);
_ilg.Stloc(objectId);
}
if (classContract.IsISerializable)
{
ReadISerializable(classContract);
}
else
{
ReadClass(classContract);
}
bool isFactoryType = InvokeFactoryMethod(classContract, objectId);
if (Globals.TypeOfIDeserializationCallback.IsAssignableFrom(classContract.UnderlyingType))
{
_ilg.Call(_objectLocal, XmlFormatGeneratorStatics.OnDeserializationMethod, null);
}
InvokeOnDeserialized(classContract);
if (objectId == null || !isFactoryType)
{
_ilg.Load(_objectLocal);
// Do a conversion back from DateTimeOffsetAdapter to DateTimeOffset after deserialization.
// DateTimeOffsetAdapter is used here for deserialization purposes to bypass the ISerializable implementation
// on DateTimeOffset; which does not work in partial trust.
if (classContract.UnderlyingType == Globals.TypeOfDateTimeOffsetAdapter)
{
_ilg.ConvertValue(_objectLocal.LocalType, Globals.TypeOfDateTimeOffsetAdapter);
_ilg.Call(XmlFormatGeneratorStatics.GetDateTimeOffsetMethod);
_ilg.ConvertValue(Globals.TypeOfDateTimeOffset, _ilg.CurrentMethod.ReturnType);
}
else if (classContract.UnderlyingType == Globals.TypeOfMemoryStreamAdapter)
{
_ilg.ConvertValue(_objectLocal.LocalType, Globals.TypeOfMemoryStreamAdapter);
_ilg.Call(XmlFormatGeneratorStatics.GetMemoryStreamMethod);
_ilg.ConvertValue(Globals.TypeOfMemoryStream, _ilg.CurrentMethod.ReturnType);
}
else
{
_ilg.ConvertValue(_objectLocal.LocalType, _ilg.CurrentMethod.ReturnType);
}
}
return (XmlFormatClassReaderDelegate)_ilg.EndMethod();
}
}
[RequiresDynamicCode(DataContract.SerializerAOTWarning)]
[RequiresUnreferencedCode(DataContract.SerializerTrimmerWarning)]
private static XmlFormatCollectionReaderDelegate CreateReflectionXmlCollectionReader()
{
return new ReflectionXmlCollectionReader().ReflectionReadCollection;
}
[RequiresDynamicCode(DataContract.SerializerAOTWarning)]
[RequiresUnreferencedCode(DataContract.SerializerTrimmerWarning)]
public XmlFormatCollectionReaderDelegate GenerateCollectionReader(CollectionDataContract collectionContract)
{
if (DataContractSerializer.Option == SerializationOption.ReflectionOnly)
{
return CreateReflectionXmlCollectionReader();
}
else
{
_ilg = GenerateCollectionReaderHelper(collectionContract, false /*isGetOnlyCollection*/);
ReadCollection(collectionContract);
_ilg.Load(_objectLocal);
_ilg.ConvertValue(_objectLocal.LocalType, _ilg.CurrentMethod.ReturnType);
return (XmlFormatCollectionReaderDelegate)_ilg.EndMethod();
}
}
[RequiresDynamicCode(DataContract.SerializerAOTWarning)]
[RequiresUnreferencedCode(DataContract.SerializerTrimmerWarning)]
private static XmlFormatGetOnlyCollectionReaderDelegate CreateReflectionReadGetOnlyCollectionReader()
{
return new ReflectionXmlCollectionReader().ReflectionReadGetOnlyCollection;
}
[RequiresDynamicCode(DataContract.SerializerAOTWarning)]
[RequiresUnreferencedCode(DataContract.SerializerTrimmerWarning)]
public XmlFormatGetOnlyCollectionReaderDelegate GenerateGetOnlyCollectionReader(CollectionDataContract collectionContract)
{
if (DataContractSerializer.Option == SerializationOption.ReflectionOnly)
{
return CreateReflectionReadGetOnlyCollectionReader();
}
else
{
_ilg = GenerateCollectionReaderHelper(collectionContract, true /*isGetOnlyCollection*/);
ReadGetOnlyCollection(collectionContract);
return (XmlFormatGetOnlyCollectionReaderDelegate)_ilg.EndMethod();
}
}
[RequiresDynamicCode(DataContract.SerializerAOTWarning)]
private CodeGenerator GenerateCollectionReaderHelper(CollectionDataContract collectionContract, bool isGetOnlyCollection)
{
_ilg = new CodeGenerator();
bool memberAccessFlag = collectionContract.RequiresMemberAccessForRead(null);
try
{
if (isGetOnlyCollection)
{
_ilg.BeginMethod("Read" + collectionContract.XmlName.Name + "FromXml" + "IsGetOnly", Globals.TypeOfXmlFormatGetOnlyCollectionReaderDelegate, memberAccessFlag);
}
else
{
_ilg.BeginMethod("Read" + collectionContract.XmlName.Name + "FromXml" + string.Empty, Globals.TypeOfXmlFormatCollectionReaderDelegate, memberAccessFlag);
}
}
catch (SecurityException securityException)
{
if (memberAccessFlag)
{
collectionContract.RequiresMemberAccessForRead(securityException);
}
else
{
throw;
}
}
InitArgs();
_collectionContractArg = _ilg.GetArg(4);
return _ilg;
}
private void InitArgs()
{
_xmlReaderArg = _ilg.GetArg(0);
_contextArg = _ilg.GetArg(1);
_memberNamesArg = _ilg.GetArg(2);
_memberNamespacesArg = _ilg.GetArg(3);
}
[MemberNotNull(nameof(_objectType))]
[MemberNotNull(nameof(_objectLocal))]
[RequiresUnreferencedCode(DataContract.SerializerTrimmerWarning)]
private void CreateObject(ClassDataContract classContract)
{
Type type = _objectType = classContract.UnderlyingType;
if (type.IsValueType && !classContract.IsNonAttributedType)
type = Globals.TypeOfValueType;
_objectLocal = _ilg.DeclareLocal(type);
if (classContract.UnderlyingType == Globals.TypeOfDBNull)
{
_ilg.LoadMember(GetDBNullValueField());
_ilg.Stloc(_objectLocal);
}
else if (classContract.IsNonAttributedType)
{
if (type.IsValueType)
{
_ilg.Ldloca(_objectLocal);
_ilg.InitObj(type);
}
else
{
_ilg.New(classContract.GetNonAttributedTypeConstructor()!);
_ilg.Stloc(_objectLocal);
}
}
else
{
_ilg.Call(null, XmlFormatGeneratorStatics.GetUninitializedObjectMethod, DataContract.GetIdForInitialization(classContract));
_ilg.ConvertValue(Globals.TypeOfObject, type);
_ilg.Stloc(_objectLocal);
}
}
private static FieldInfo GetDBNullValueField() => typeof(DBNull).GetField("Value")!;
private void InvokeOnDeserializing(ClassDataContract classContract)
{
Debug.Assert(_objectLocal != null);
Debug.Assert(_objectType != null);
if (classContract.BaseClassContract != null)
InvokeOnDeserializing(classContract.BaseClassContract);
if (classContract.OnDeserializing != null)
{
_ilg.LoadAddress(_objectLocal);
_ilg.ConvertAddress(_objectLocal.LocalType, _objectType);
_ilg.Load(_contextArg);
_ilg.LoadMember(XmlFormatGeneratorStatics.GetStreamingContextMethod);
_ilg.Call(classContract.OnDeserializing);
}
}
private void InvokeOnDeserialized(ClassDataContract classContract)
{
Debug.Assert(_objectLocal != null);
Debug.Assert(_objectType != null);
if (classContract.BaseClassContract != null)
InvokeOnDeserialized(classContract.BaseClassContract);
if (classContract.OnDeserialized != null)
{
_ilg.LoadAddress(_objectLocal);
_ilg.ConvertAddress(_objectLocal.LocalType, _objectType);
_ilg.Load(_contextArg);
_ilg.LoadMember(XmlFormatGeneratorStatics.GetStreamingContextMethod);
_ilg.Call(classContract.OnDeserialized);
}
}
private static bool HasFactoryMethod(ClassDataContract classContract)
{
return Globals.TypeOfIObjectReference.IsAssignableFrom(classContract.UnderlyingType);
}
private bool InvokeFactoryMethod(ClassDataContract classContract, LocalBuilder? objectId)
{
Debug.Assert(_objectLocal != null);
if (HasFactoryMethod(classContract))
{
_ilg.Load(_contextArg);
_ilg.LoadAddress(_objectLocal);
_ilg.ConvertAddress(_objectLocal.LocalType, Globals.TypeOfIObjectReference);
_ilg.Load(objectId);
_ilg.Call(XmlFormatGeneratorStatics.GetRealObjectMethod);
_ilg.ConvertValue(Globals.TypeOfObject, _ilg.CurrentMethod.ReturnType);
return true;
}
return false;
}
[RequiresDynamicCode(DataContract.SerializerAOTWarning)]
[RequiresUnreferencedCode(DataContract.SerializerTrimmerWarning)]
private void ReadClass(ClassDataContract classContract)
{
if (classContract.HasExtensionData)
{
LocalBuilder extensionDataLocal = _ilg.DeclareLocal(Globals.TypeOfExtensionDataObject);
_ilg.New(XmlFormatGeneratorStatics.ExtensionDataObjectCtor);
_ilg.Store(extensionDataLocal);
ReadMembers(classContract, extensionDataLocal);
ClassDataContract? currentContract = classContract;
while (currentContract != null)
{
MethodInfo? extensionDataSetMethod = currentContract.ExtensionDataSetMethod;
if (extensionDataSetMethod != null)
_ilg.Call(_objectLocal, extensionDataSetMethod, extensionDataLocal);
currentContract = currentContract.BaseClassContract;
}
}
else
{
ReadMembers(classContract, null /*extensionDataLocal*/);
}
}
[RequiresDynamicCode(DataContract.SerializerAOTWarning)]
[RequiresUnreferencedCode(DataContract.SerializerTrimmerWarning)]
private void ReadMembers(ClassDataContract classContract, LocalBuilder? extensionDataLocal)
{
int memberCount = classContract.MemberNames!.Length;
_ilg.Call(_contextArg, XmlFormatGeneratorStatics.IncrementItemCountMethod, memberCount);
LocalBuilder memberIndexLocal = _ilg.DeclareLocal(Globals.TypeOfInt, -1);
int firstRequiredMember;
bool[] requiredMembers = GetRequiredMembers(classContract, out firstRequiredMember);
bool hasRequiredMembers = (firstRequiredMember < memberCount);
LocalBuilder? requiredIndexLocal = hasRequiredMembers ? _ilg.DeclareLocal(Globals.TypeOfInt, firstRequiredMember) : null;
object forReadElements = _ilg.For(null, null, null);
_ilg.Call(null, XmlFormatGeneratorStatics.MoveToNextElementMethod, _xmlReaderArg);
_ilg.IfFalseBreak(forReadElements);
if (hasRequiredMembers)
_ilg.Call(_contextArg, XmlFormatGeneratorStatics.GetMemberIndexWithRequiredMembersMethod, _xmlReaderArg, _memberNamesArg, _memberNamespacesArg, memberIndexLocal, requiredIndexLocal, extensionDataLocal);
else
_ilg.Call(_contextArg, XmlFormatGeneratorStatics.GetMemberIndexMethod, _xmlReaderArg, _memberNamesArg, _memberNamespacesArg, memberIndexLocal, extensionDataLocal);
if (memberCount > 0)
{
Label[] memberLabels = _ilg.Switch(memberCount);
ReadMembers(classContract, requiredMembers, memberLabels, memberIndexLocal, requiredIndexLocal);
_ilg.EndSwitch();
}
else
{
_ilg.Pop();
}
_ilg.EndFor();
if (hasRequiredMembers)
{
_ilg.If(requiredIndexLocal!, Cmp.LessThan, memberCount);
_ilg.Call(null, XmlFormatGeneratorStatics.ThrowRequiredMemberMissingExceptionMethod, _xmlReaderArg, memberIndexLocal, requiredIndexLocal, _memberNamesArg);
_ilg.EndIf();
}
}
[RequiresDynamicCode(DataContract.SerializerAOTWarning)]
[RequiresUnreferencedCode(DataContract.SerializerTrimmerWarning)]
private int ReadMembers(ClassDataContract classContract, bool[] requiredMembers, Label[] memberLabels, LocalBuilder memberIndexLocal, LocalBuilder? requiredIndexLocal)
{
Debug.Assert(_objectLocal != null);
Debug.Assert(_objectType != null);
int memberCount = (classContract.BaseClassContract == null) ? 0 : ReadMembers(classContract.BaseClassContract, requiredMembers,
memberLabels, memberIndexLocal, requiredIndexLocal);
for (int i = 0; i < classContract.Members!.Count; i++, memberCount++)
{
DataMember dataMember = classContract.Members[i];
Type memberType = dataMember.MemberType;
_ilg.Case(memberLabels[memberCount]);
if (dataMember.IsRequired)
{
int nextRequiredIndex = memberCount + 1;
for (; nextRequiredIndex < requiredMembers.Length; nextRequiredIndex++)
if (requiredMembers[nextRequiredIndex])
break;
_ilg.Set(requiredIndexLocal!, nextRequiredIndex);
}
LocalBuilder? value;
if (dataMember.IsGetOnlyCollection)
{
_ilg.LoadAddress(_objectLocal);
_ilg.LoadMember(dataMember.MemberInfo);
value = _ilg.DeclareLocal(memberType);
_ilg.Stloc(value);
_ilg.Call(_contextArg, XmlFormatGeneratorStatics.StoreCollectionMemberInfoMethod, value);
ReadValue(memberType, dataMember.Name, classContract.XmlName.Namespace);
}
else
{
_ilg.Call(_contextArg, XmlFormatGeneratorStatics.ResetCollectionMemberInfoMethod);
value = ReadValue(memberType, dataMember.Name, classContract.XmlName.Namespace);
_ilg.LoadAddress(_objectLocal);
_ilg.ConvertAddress(_objectLocal.LocalType, _objectType);
_ilg.Ldloc(value);
_ilg.StoreMember(dataMember.MemberInfo);
}
_ilg.Set(memberIndexLocal, memberCount);
_ilg.EndCase();
}
return memberCount;
}
private static bool[] GetRequiredMembers(ClassDataContract contract, out int firstRequiredMember)
{
int memberCount = contract.MemberNames!.Length;
bool[] requiredMembers = new bool[memberCount];
GetRequiredMembers(contract, requiredMembers);
for (firstRequiredMember = 0; firstRequiredMember < memberCount; firstRequiredMember++)
if (requiredMembers[firstRequiredMember])
break;
return requiredMembers;
}
private static int GetRequiredMembers(ClassDataContract contract, bool[] requiredMembers)
{
int memberCount = (contract.BaseClassContract == null) ? 0 : GetRequiredMembers(contract.BaseClassContract, requiredMembers);
List<DataMember> members = contract.Members!;
for (int i = 0; i < members.Count; i++, memberCount++)
{
requiredMembers[memberCount] = members[i].IsRequired;
}
return memberCount;
}
[RequiresUnreferencedCode(DataContract.SerializerTrimmerWarning)]
private void ReadISerializable(ClassDataContract classContract)
{
Debug.Assert(_objectLocal != null);
Debug.Assert(_objectType != null);
ConstructorInfo ctor = classContract.GetISerializableConstructor()!;
_ilg.LoadAddress(_objectLocal);
_ilg.ConvertAddress(_objectLocal.LocalType, _objectType);
_ilg.Call(_contextArg, XmlFormatGeneratorStatics.ReadSerializationInfoMethod, _xmlReaderArg, classContract.UnderlyingType);
_ilg.Load(_contextArg);
_ilg.LoadMember(XmlFormatGeneratorStatics.GetStreamingContextMethod);
_ilg.Call(ctor);
}
[RequiresDynamicCode(DataContract.SerializerAOTWarning)]
[RequiresUnreferencedCode(DataContract.SerializerTrimmerWarning)]
private LocalBuilder ReadValue(Type type, string name, string ns)
{
LocalBuilder value = _ilg.DeclareLocal(type);
LocalBuilder? nullableValue = null;
int nullables = 0;
while (type.IsGenericType && type.GetGenericTypeDefinition() == Globals.TypeOfNullable)
{
nullables++;
type = type.GetGenericArguments()[0];
}
PrimitiveDataContract? primitiveContract = PrimitiveDataContract.GetPrimitiveDataContract(type);
if ((primitiveContract != null && primitiveContract.UnderlyingType != Globals.TypeOfObject) || nullables != 0 || type.IsValueType)
{
LocalBuilder objectId = _ilg.DeclareLocal(Globals.TypeOfString);
_ilg.Call(_contextArg, XmlFormatGeneratorStatics.ReadAttributesMethod, _xmlReaderArg);
_ilg.Call(_contextArg, XmlFormatGeneratorStatics.ReadIfNullOrRefMethod, _xmlReaderArg, type, DataContract.IsTypeSerializable(type));
_ilg.Stloc(objectId);
// Deserialize null
_ilg.If(objectId, Cmp.EqualTo, Globals.NullObjectId);
if (nullables != 0)
{
_ilg.LoadAddress(value);
_ilg.InitObj(value.LocalType);
}
else if (type.IsValueType)
ThrowValidationException(SR.Format(SR.ValueTypeCannotBeNull, DataContract.GetClrTypeFullName(type)));
else
{
_ilg.Load(null);
_ilg.Stloc(value);
}
// Deserialize value
// Compare against Globals.NewObjectId, which is set to string.Empty
_ilg.ElseIfIsEmptyString(objectId);
_ilg.Call(_contextArg, XmlFormatGeneratorStatics.GetObjectIdMethod);
_ilg.Stloc(objectId);
if (type.IsValueType)
{
_ilg.IfNotIsEmptyString(objectId);
ThrowValidationException(SR.Format(SR.ValueTypeCannotHaveId, DataContract.GetClrTypeFullName(type)));
_ilg.EndIf();
}
if (nullables != 0)
{
nullableValue = value;
value = _ilg.DeclareLocal(type);
}
if (primitiveContract != null && primitiveContract.UnderlyingType != Globals.TypeOfObject)
{
_ilg.Call(_xmlReaderArg, primitiveContract.XmlFormatReaderMethod);
_ilg.Stloc(value);
if (!type.IsValueType)
_ilg.Call(_contextArg, XmlFormatGeneratorStatics.AddNewObjectMethod, value);
}
else
{
InternalDeserialize(value, type, name, ns);
}
// Deserialize ref
_ilg.Else();
if (type.IsValueType)
ThrowValidationException(SR.Format(SR.ValueTypeCannotHaveRef, DataContract.GetClrTypeFullName(type)));
else
{
_ilg.Call(_contextArg, XmlFormatGeneratorStatics.GetExistingObjectMethod, objectId, type, name, ns);
_ilg.ConvertValue(Globals.TypeOfObject, type);
_ilg.Stloc(value);
}
_ilg.EndIf();
if (nullableValue != null)
{
_ilg.If(objectId, Cmp.NotEqualTo, Globals.NullObjectId);
WrapNullableObject(value, nullableValue, nullables);
_ilg.EndIf();
value = nullableValue;
}
}
else
{
InternalDeserialize(value, type, name, ns);
}
return value;
}
[RequiresUnreferencedCode(DataContract.SerializerTrimmerWarning)]
private void InternalDeserialize(LocalBuilder value, Type type, string name, string ns)
{
_ilg.Load(_contextArg);
_ilg.Load(_xmlReaderArg);
Type declaredType = type.IsPointer ? Globals.TypeOfReflectionPointer : type;
_ilg.Load(DataContract.GetId(declaredType.TypeHandle));
_ilg.Ldtoken(declaredType);
_ilg.Load(name);
_ilg.Load(ns);
_ilg.Call(XmlFormatGeneratorStatics.InternalDeserializeMethod);
if (type.IsPointer)
_ilg.Call(XmlFormatGeneratorStatics.UnboxPointer);
else
_ilg.ConvertValue(Globals.TypeOfObject, type);
_ilg.Stloc(value);
}
[RequiresDynamicCode(DataContract.SerializerAOTWarning)]
[RequiresUnreferencedCode(DataContract.SerializerTrimmerWarning)]
private void WrapNullableObject(LocalBuilder innerValue, LocalBuilder outerValue, int nullables)
{
Type innerType = innerValue.LocalType, outerType = outerValue.LocalType;
_ilg.LoadAddress(outerValue);
_ilg.Load(innerValue);
for (int i = 1; i < nullables; i++)
{
Type type = Globals.TypeOfNullable.MakeGenericType(innerType);
_ilg.New(type.GetConstructor(new Type[] { innerType })!);
innerType = type;
}
_ilg.Call(outerType.GetConstructor(new Type[] { innerType })!);
}
[MemberNotNull(nameof(_objectLocal))]
[RequiresDynamicCode(DataContract.SerializerAOTWarning)]
[RequiresUnreferencedCode(DataContract.SerializerTrimmerWarning)]
private void ReadCollection(CollectionDataContract collectionContract)
{
Type type = collectionContract.UnderlyingType;
Type itemType = collectionContract.ItemType;
bool isArray = (collectionContract.Kind == CollectionKind.Array);
ConstructorInfo constructor = collectionContract.Constructor!;
if (type.IsInterface)
{
switch (collectionContract.Kind)
{
case CollectionKind.GenericDictionary:
type = Globals.TypeOfDictionaryGeneric.MakeGenericType(itemType.GetGenericArguments());
constructor = type.GetConstructor(BindingFlags.Instance | BindingFlags.Public, Type.EmptyTypes)!;
break;
case CollectionKind.Dictionary:
type = Globals.TypeOfHashtable;
constructor = XmlFormatGeneratorStatics.HashtableCtor;
break;
case CollectionKind.Collection:
case CollectionKind.GenericCollection:
case CollectionKind.Enumerable:
case CollectionKind.GenericEnumerable:
case CollectionKind.List:
case CollectionKind.GenericList:
type = itemType.MakeArrayType();
isArray = true;
break;
}
}
string itemName = collectionContract.ItemName;
string itemNs = collectionContract.XmlName.Namespace;
_objectLocal = _ilg.DeclareLocal(type);
if (!isArray)
{
if (type.IsValueType)
{
_ilg.Ldloca(_objectLocal);
_ilg.InitObj(type);
}
else
{
_ilg.New(constructor);
_ilg.Stloc(_objectLocal);
_ilg.Call(_contextArg, XmlFormatGeneratorStatics.AddNewObjectMethod, _objectLocal);
}
}
LocalBuilder size = _ilg.DeclareLocal(Globals.TypeOfInt);
_ilg.Call(_contextArg, XmlFormatGeneratorStatics.GetArraySizeMethod);
_ilg.Stloc(size);
LocalBuilder objectId = _ilg.DeclareLocal(Globals.TypeOfString);
_ilg.Call(_contextArg, XmlFormatGeneratorStatics.GetObjectIdMethod);
_ilg.Stloc(objectId);
bool canReadPrimitiveArray = false;
if (isArray && TryReadPrimitiveArray(itemType, size))
{
canReadPrimitiveArray = true;
_ilg.IfNot();
}
_ilg.If(size, Cmp.EqualTo, -1);
LocalBuilder? growingCollection = null;
if (isArray)
{
growingCollection = _ilg.DeclareLocal(type);
_ilg.NewArray(itemType, 32);
_ilg.Stloc(growingCollection);
}
LocalBuilder i = _ilg.DeclareLocal(Globals.TypeOfInt);
object forLoop = _ilg.For(i, 0, int.MaxValue);
IsStartElement(_memberNamesArg, _memberNamespacesArg);
_ilg.If();
_ilg.Call(_contextArg, XmlFormatGeneratorStatics.IncrementItemCountMethod, 1);
LocalBuilder value = ReadCollectionItem(collectionContract, itemType, itemName, itemNs);
if (isArray)
{
Debug.Assert(growingCollection != null);
MethodInfo ensureArraySizeMethod = XmlFormatGeneratorStatics.EnsureArraySizeMethod.MakeGenericMethod(itemType);
_ilg.Call(null, ensureArraySizeMethod, growingCollection, i);
_ilg.Stloc(growingCollection);
_ilg.StoreArrayElement(growingCollection, i, value);
}
else
StoreCollectionValue(_objectLocal, value, collectionContract);
_ilg.Else();
IsEndElement();
_ilg.If();
_ilg.Break(forLoop);
_ilg.Else();
HandleUnexpectedItemInCollection(i);
_ilg.EndIf();
_ilg.EndIf();
_ilg.EndFor();
if (isArray)
{
MethodInfo trimArraySizeMethod = XmlFormatGeneratorStatics.TrimArraySizeMethod.MakeGenericMethod(itemType);
_ilg.Call(null, trimArraySizeMethod, growingCollection, i);
_ilg.Stloc(_objectLocal);
_ilg.Call(_contextArg, XmlFormatGeneratorStatics.AddNewObjectWithIdMethod, objectId, _objectLocal);
}
_ilg.Else();
_ilg.Call(_contextArg, XmlFormatGeneratorStatics.IncrementItemCountMethod, size);
if (isArray)
{
_ilg.NewArray(itemType, size);
_ilg.Stloc(_objectLocal);
_ilg.Call(_contextArg, XmlFormatGeneratorStatics.AddNewObjectMethod, _objectLocal);
}
LocalBuilder j = _ilg.DeclareLocal(Globals.TypeOfInt);
_ilg.For(j, 0, size);
IsStartElement(_memberNamesArg, _memberNamespacesArg);
_ilg.If();
LocalBuilder itemValue = ReadCollectionItem(collectionContract, itemType, itemName, itemNs);
if (isArray)
_ilg.StoreArrayElement(_objectLocal, j, itemValue);
else
StoreCollectionValue(_objectLocal, itemValue, collectionContract);
_ilg.Else();
HandleUnexpectedItemInCollection(j);
_ilg.EndIf();
_ilg.EndFor();
_ilg.Call(_contextArg, XmlFormatGeneratorStatics.CheckEndOfArrayMethod, _xmlReaderArg, size, _memberNamesArg, _memberNamespacesArg);
_ilg.EndIf();
if (canReadPrimitiveArray)
{
_ilg.Else();
_ilg.Call(_contextArg, XmlFormatGeneratorStatics.AddNewObjectWithIdMethod, objectId, _objectLocal);
_ilg.EndIf();
}
}
[RequiresDynamicCode(DataContract.SerializerAOTWarning)]
[RequiresUnreferencedCode(DataContract.SerializerTrimmerWarning)]
private void ReadGetOnlyCollection(CollectionDataContract collectionContract)
{
Type type = collectionContract.UnderlyingType;
Type itemType = collectionContract.ItemType;
bool isArray = (collectionContract.Kind == CollectionKind.Array);
string itemName = collectionContract.ItemName;
string itemNs = collectionContract.XmlName.Namespace;
_objectLocal = _ilg.DeclareLocal(type);
_ilg.Load(_contextArg);
_ilg.LoadMember(XmlFormatGeneratorStatics.GetCollectionMemberMethod);
_ilg.ConvertValue(Globals.TypeOfObject, type);
_ilg.Stloc(_objectLocal);
//check that items are actually going to be deserialized into the collection
IsStartElement(_memberNamesArg, _memberNamespacesArg);
_ilg.If();
_ilg.If(_objectLocal, Cmp.EqualTo, null);
_ilg.Call(null, XmlFormatGeneratorStatics.ThrowNullValueReturnedForGetOnlyCollectionExceptionMethod, type);
_ilg.Else();
LocalBuilder size = _ilg.DeclareLocal(Globals.TypeOfInt);
if (isArray)
{
_ilg.Load(_objectLocal);
_ilg.Call(XmlFormatGeneratorStatics.GetArrayLengthMethod);
_ilg.Stloc(size);
}
_ilg.Call(_contextArg, XmlFormatGeneratorStatics.AddNewObjectMethod, _objectLocal);
LocalBuilder i = _ilg.DeclareLocal(Globals.TypeOfInt);
object forLoop = _ilg.For(i, 0, int.MaxValue);
IsStartElement(_memberNamesArg, _memberNamespacesArg);
_ilg.If();
_ilg.Call(_contextArg, XmlFormatGeneratorStatics.IncrementItemCountMethod, 1);
LocalBuilder value = ReadCollectionItem(collectionContract, itemType, itemName, itemNs);
if (isArray)
{
_ilg.If(size, Cmp.EqualTo, i);
_ilg.Call(null, XmlFormatGeneratorStatics.ThrowArrayExceededSizeExceptionMethod, size, type);
_ilg.Else();
_ilg.StoreArrayElement(_objectLocal, i, value);
_ilg.EndIf();
}
else
StoreCollectionValue(_objectLocal, value, collectionContract);
_ilg.Else();
IsEndElement();
_ilg.If();
_ilg.Break(forLoop);
_ilg.Else();
HandleUnexpectedItemInCollection(i);
_ilg.EndIf();
_ilg.EndIf();
_ilg.EndFor();
_ilg.Call(_contextArg, XmlFormatGeneratorStatics.CheckEndOfArrayMethod, _xmlReaderArg, size, _memberNamesArg, _memberNamespacesArg);
_ilg.EndIf();
_ilg.EndIf();
}
[RequiresDynamicCode(DataContract.SerializerAOTWarning)]
[RequiresUnreferencedCode(DataContract.SerializerTrimmerWarning)]
private bool TryReadPrimitiveArray(Type itemType, LocalBuilder size)
{
Debug.Assert(_objectLocal != null);
PrimitiveDataContract? primitiveContract = PrimitiveDataContract.GetPrimitiveDataContract(itemType);
if (primitiveContract == null)
return false;
string? readArrayMethod = null;
switch (Type.GetTypeCode(itemType))
{
case TypeCode.Boolean:
readArrayMethod = "TryReadBooleanArray";
break;
case TypeCode.DateTime:
readArrayMethod = "TryReadDateTimeArray";
break;
case TypeCode.Decimal:
readArrayMethod = "TryReadDecimalArray";
break;
case TypeCode.Int32:
readArrayMethod = "TryReadInt32Array";
break;
case TypeCode.Int64:
readArrayMethod = "TryReadInt64Array";
break;
case TypeCode.Single:
readArrayMethod = "TryReadSingleArray";
break;
case TypeCode.Double:
readArrayMethod = "TryReadDoubleArray";
break;
default:
break;
}
if (readArrayMethod != null)
{
_ilg.Load(_xmlReaderArg);
_ilg.Load(_contextArg);
_ilg.Load(_memberNamesArg);
_ilg.Load(_memberNamespacesArg);
_ilg.Load(size);
_ilg.Ldloca(_objectLocal);
_ilg.Call(typeof(XmlReaderDelegator).GetMethod(readArrayMethod, Globals.ScanAllMembers)!);
return true;
}
return false;
}
[RequiresDynamicCode(DataContract.SerializerAOTWarning)]
[RequiresUnreferencedCode(DataContract.SerializerTrimmerWarning)]
private LocalBuilder ReadCollectionItem(CollectionDataContract collectionContract, Type itemType, string itemName, string itemNs)
{
if (collectionContract.Kind == CollectionKind.Dictionary || collectionContract.Kind == CollectionKind.GenericDictionary)
{
_ilg.Call(_contextArg, XmlFormatGeneratorStatics.ResetAttributesMethod);
LocalBuilder value = _ilg.DeclareLocal(itemType);
_ilg.Load(_collectionContractArg);
_ilg.Call(XmlFormatGeneratorStatics.GetItemContractMethod);
_ilg.Load(_xmlReaderArg);
_ilg.Load(_contextArg);
_ilg.Call(XmlFormatGeneratorStatics.ReadXmlValueMethod);
_ilg.ConvertValue(Globals.TypeOfObject, itemType);
_ilg.Stloc(value);
return value;
}
else
{
return ReadValue(itemType, itemName, itemNs);
}
}
[RequiresDynamicCode(DataContract.SerializerAOTWarning)]
[RequiresUnreferencedCode(DataContract.SerializerTrimmerWarning)]
private void StoreCollectionValue(LocalBuilder collection, LocalBuilder value, CollectionDataContract collectionContract)
{
Debug.Assert(collectionContract.AddMethod != null);
if (collectionContract.Kind == CollectionKind.GenericDictionary || collectionContract.Kind == CollectionKind.Dictionary)
{
ClassDataContract? keyValuePairContract = DataContract.GetDataContract(value.LocalType) as ClassDataContract;
if (keyValuePairContract == null)
{
Debug.Fail("Failed to create contract for KeyValuePair type");
}
DataMember keyMember = keyValuePairContract.Members![0];
DataMember valueMember = keyValuePairContract.Members[1];
LocalBuilder pairKey = _ilg.DeclareLocal(keyMember.MemberType);
LocalBuilder pairValue = _ilg.DeclareLocal(valueMember.MemberType);
_ilg.LoadAddress(value);
_ilg.LoadMember(keyMember.MemberInfo);
_ilg.Stloc(pairKey);
_ilg.LoadAddress(value);
_ilg.LoadMember(valueMember.MemberInfo);
_ilg.Stloc(pairValue);
_ilg.Call(collection, collectionContract.AddMethod, pairKey, pairValue);
if (collectionContract.AddMethod.ReturnType != Globals.TypeOfVoid)
_ilg.Pop();
}
else
{
_ilg.Call(collection, collectionContract.AddMethod, value);
if (collectionContract.AddMethod.ReturnType != Globals.TypeOfVoid)
_ilg.Pop();
}
}
private void HandleUnexpectedItemInCollection(LocalBuilder iterator)
{
IsStartElement();
_ilg.If();
_ilg.Call(_contextArg, XmlFormatGeneratorStatics.SkipUnknownElementMethod, _xmlReaderArg);
_ilg.Dec(iterator);
_ilg.Else();
ThrowUnexpectedStateException(XmlNodeType.Element);
_ilg.EndIf();
}
private void IsStartElement(ArgBuilder nameArg, ArgBuilder nsArg)
{
_ilg.Call(_xmlReaderArg, XmlFormatGeneratorStatics.IsStartElementMethod2, nameArg, nsArg);
}
private void IsStartElement()
{
_ilg.Call(_xmlReaderArg, XmlFormatGeneratorStatics.IsStartElementMethod0);
}
private void IsEndElement()
{
_ilg.Load(_xmlReaderArg);
_ilg.LoadMember(XmlFormatGeneratorStatics.NodeTypeProperty);
_ilg.Load(XmlNodeType.EndElement);
_ilg.Ceq();
}
private void ThrowUnexpectedStateException(XmlNodeType expectedState)
{
_ilg.Call(null, XmlFormatGeneratorStatics.CreateUnexpectedStateExceptionMethod, expectedState, _xmlReaderArg);
_ilg.Throw();
}
private void ThrowValidationException(string msg)
{
_ilg.Load(msg);
ThrowValidationException();
}
private void ThrowValidationException()
{
_ilg.New(XmlFormatGeneratorStatics.SerializationExceptionCtor);
_ilg.Throw();
}
}
internal static object UnsafeGetUninitializedObject(
[DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors | DynamicallyAccessedMemberTypes.NonPublicConstructors)]
Type type)
{
return RuntimeHelpers.GetUninitializedObject(type);
}
/// <SecurityNote>
/// Critical - Elevates by calling GetUninitializedObject which has a LinkDemand
/// Safe - marked as such so that it's callable from transparent generated IL. Takes id as parameter which
/// is guaranteed to be in internal serialization cache.
/// </SecurityNote>
[RequiresUnreferencedCode(DataContract.SerializerTrimmerWarning)]
internal static object UnsafeGetUninitializedObject(int id)
{
var type = DataContract.GetDataContractForInitialization(id).TypeForInitialization;
return UnsafeGetUninitializedObject(type);
}
}
}
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