internal static void GetReadExpression(ParameterExpression inputStream,
ParameterExpression objTracking,
Type expectedType,
List <Expression> loopExpressions,
ParameterExpression tmpVariable,
ParameterExpression typeExpr,
ParameterExpression typeName,
ParameterExpression typeHashCode,
ParameterExpression deserializer)
{
if (expectedType == typeof(string))
{
loopExpressions.Add(Expression.Assign(tmpVariable, Deserializer.GenerateStringExpression(inputStream, objTracking)));
}
else if (expectedType.IsPrimitive || expectedType.IsValueType)
{
var primitiveDeserializer = Deserializer.GetTypeDeserializer(expectedType);
loopExpressions.Add(Expression.Assign(tmpVariable, Expression.Convert(Expression.Invoke(Expression.Constant(primitiveDeserializer), inputStream, objTracking), expectedType)));
}
else
{
loopExpressions.Add(Deserializer.GetReadClassExpression(inputStream, objTracking, tmpVariable, typeExpr, typeName, typeHashCode, deserializer, expectedType));
}
}
/// <summary>
/// Generates an expression tree to deserialize an ExpandoObject
/// </summary>
/// <param name="variables">Global variables for the expression tree</param>
/// <param name="inputStream">Stream to read from</param>
/// <param name="objTracker">Reference tracker</param>
/// <returns>An expression tree to deserialize an ExpandoObject</returns>
internal static Expression GenerateExpandoObjectExpression(List <ParameterExpression> variables,
ParameterExpression inputStream,
ParameterExpression objTracker)
{
var dictType = typeof(IDictionary <string, object>);
var length = Expression.Parameter(typeof(int), "length");
var i = Expression.Parameter(typeof(int), "i");
var key = Expression.Parameter(typeof(string), "key");
var value = Expression.Parameter(typeof(object), "value");
var typeName = Expression.Parameter(typeof(string), "typeName");
var typeExpr = Expression.Parameter(typeof(TypeWithHashCode), "type");
var deserializer = Expression.Parameter(typeof(Func <Stream, DeserializerObjectTracker, object>), "deserializer");
var newInstance = Expression.Parameter(typeof(ExpandoObject), "newInstance");
var destDict = Expression.Parameter(dictType, "destDict");
var typeHashCode = Expression.Parameter(typeof(int), "typeHashCode");
var trackType = Expression.Parameter(typeof(byte), "trackType");
variables.Add(key);
variables.Add(value);
variables.Add(length);
variables.Add(i);
variables.Add(deserializer);
variables.Add(typeName);
variables.Add(typeExpr);
variables.Add(newInstance);
variables.Add(destDict);
variables.Add(typeHashCode);
variables.Add(trackType);
var loopExpressions = new List <Expression>();
loopExpressions.Add(Expression.Assign(key, Deserializer.GenerateStringExpression(inputStream, objTracker)));
loopExpressions.Add(Deserializer.GetReadClassExpression(inputStream, objTracker, value, typeExpr, typeName, typeHashCode, deserializer, typeof(object)));
loopExpressions.Add(Expression.Call(destDict, DictionaryMih.Add <string, object>(), key, value));
loopExpressions.Add(Expression.Assign(i, Expression.Add(i, Expression.Constant(1))));
var cond = Expression.LessThan(i, length);
var loopBody = Expression.Block(loopExpressions);
var breakLabel = Expression.Label("breakLabel");
var loop = Expression.Loop(Expression.IfThenElse(cond,
loopBody,
Expression.Break(breakLabel)),
breakLabel);
var notTrackedExpressions = new List <Expression>();
notTrackedExpressions.Add(Expression.Assign(length, PrimitiveHelpers.ReadInt32(inputStream, objTracker)));
notTrackedExpressions.Add(Expression.Assign(i, Expression.Constant(0)));
notTrackedExpressions.Add(Expression.Assign(newInstance, Expression.New(typeof(ExpandoObject))));
notTrackedExpressions.Add(Expression.Assign(destDict, Expression.Convert(newInstance, dictType)));
notTrackedExpressions.Add(Expression.Call(objTracker, DeserializerObjectTrackerMih.TrackedObject(), newInstance));
notTrackedExpressions.Add(loop);
return(Deserializer.GenerateNullTrackedOrUntrackedExpression(typeof(ExpandoObject),
inputStream,
objTracker,
newInstance,
notTrackedExpressions,
trackType,
variables));
}
private static IEnumerable <Expression> ReadDimensionalArray(Type type,
Type elementType,
ParameterExpression newInstance,
List <ParameterExpression> variables,
ParameterExpression inputStream,
ParameterExpression lengths,
ParameterExpression objTracker,
int rank)
{
var typeName = Expression.Parameter(typeof(string), "typeName");
var typeExpr = Expression.Parameter(typeof(TypeWithHashCode), "type");
var indices = Expression.Parameter(typeof(int[]), "indices");
var tmpValue = Expression.Parameter(elementType, "tmpValue");
var deserializer = Expression.Parameter(typeof(Func <Stream, DeserializerObjectTracker, object>), "deserializer");
var typeHashCode = Expression.Parameter(typeof(int), "typeHashCode");
variables.Add(deserializer);
variables.Add(typeName);
variables.Add(typeExpr);
variables.Add(tmpValue);
variables.Add(typeHashCode);
var expressions = new List <Expression>();
expressions.Add(Expression.Assign(newInstance, Expression.Convert(Expression.Call(ArrayMih.CreateInstance(), Expression.Constant(elementType), lengths), type)));
if (type.IsClass)
{
expressions.Add(Expression.Call(objTracker, DeserializerObjectTrackerMih.TrackedObject(), newInstance));
}
if (rank > 1)
{
variables.Add(indices);
expressions.Add(Expression.Assign(indices, Expression.Call(CreateArrayMethodInfo.GetCreateArrayMethodInfo(typeof(int)), Expression.Property(lengths, "Length"))));
}
Expression innerExpression;
if (elementType == typeof(string))
{
innerExpression = Expression.Assign(tmpValue, Deserializer.GenerateStringExpression(inputStream, objTracker));
}
else if (elementType.IsPrimitive || elementType.IsValueType)
{
var primitiveReader = Deserializer.GetPrimitiveReader(elementType);
if (primitiveReader == null)
{
var primitiveDeserializer = Deserializer.GetTypeDeserializer(elementType);
innerExpression = Expression.Assign(tmpValue, Expression.Convert(Expression.Invoke(Expression.Constant(primitiveDeserializer), inputStream, objTracker), elementType));
}
else
{
if (elementType == typeof(byte) ||
elementType == typeof(sbyte) ||
elementType == typeof(byte?) ||
elementType == typeof(sbyte?) ||
Deserializer.IsEnumOrNullableEnum(elementType))
{
innerExpression = Expression.Assign(tmpValue, Expression.Convert(primitiveReader(inputStream, objTracker), elementType));
}
else
{
innerExpression = Expression.Assign(tmpValue, primitiveReader(inputStream, objTracker));
}
}
}
else
{
innerExpression = Deserializer.GetReadClassExpression(inputStream, objTracker, tmpValue, typeExpr, typeName, typeHashCode, deserializer, elementType);
}
Func <int, Expression, Expression> readArrayLoop = (loopRank,
innerExpr) =>
{
var loopRankIndex = Expression.Parameter(typeof(int), "loopRankIndex" + loopRank);
variables.Add(loopRankIndex);
var loopExpressions = new List <Expression>();
if (rank == 1)
{
loopExpressions.Add(innerExpr);
loopExpressions.Add(Expression.Assign(Expression.ArrayAccess(newInstance, loopRankIndex), tmpValue));
}
else
{
loopExpressions.Add(Expression.Assign(Expression.ArrayAccess(indices, Expression.Constant(loopRank)), loopRankIndex));
loopExpressions.Add(innerExpr);
loopExpressions.Add(Expression.Call(newInstance, ArrayMih.SetValueRank(), Expression.Convert(tmpValue, typeof(object)), indices));
}
loopExpressions.Add(Expression.Assign(loopRankIndex, Expression.Add(loopRankIndex, Expression.Constant(1))));
var cond = Expression.LessThan(loopRankIndex, Expression.ArrayIndex(lengths, Expression.Constant(loopRank)));
var loopBody = Expression.Block(loopExpressions);
var breakLabel = Expression.Label("breakLabel" + loopRank);
var loop = Expression.Loop(Expression.IfThenElse(cond,
loopBody,
Expression.Break(breakLabel)),
breakLabel);
return(Expression.Block(Expression.Assign(loopRankIndex, Expression.Constant(0)),
loop));
};
for (int r = rank - 1; r >= 0; r--)
{
innerExpression = readArrayLoop(r, innerExpression);
}
expressions.Add(innerExpression);
return(expressions);
}
/// <summary>
/// Generate an expression tree to deserialize a class
/// </summary>
/// <param name="inputStream">Stream to read from</param>
/// <param name="objTracker">Reference tracker</param>
/// <param name="leftSide">Left side of the assignment</param>
/// <param name="typeExpr">Type of the class as an expression</param>
/// <param name="typeName">Type of the class as a string</param>
/// <param name="typeHashCode">Hashcode of the class</param>
/// <param name="deserializer">Temporary deserializer variable</param>
/// <param name="itemType">Type of the class</param>
/// <returns>An expression tree to deserialize a class</returns>
internal static Expression GetReadClassExpression(ParameterExpression inputStream,
ParameterExpression objTracker,
Expression leftSide,
ParameterExpression typeExpr,
ParameterExpression typeName,
ParameterExpression typeHashCode,
ParameterExpression deserializer,
Type itemType)
{
var readType = Expression.IfThenElse(Expression.Equal(Expression.Convert(PrimitiveHelpers.ReadByte(inputStream, objTracker), typeof(byte)), Expression.Constant(SerializerObjectTracker.Value0)),
Expression.Assign(typeExpr, Expression.Call(SerializedTypeResolverMih.GetTypeFromFullName_Type(), Expression.Constant(itemType))),
Expression.Block(Expression.Assign(typeName, Deserializer.GenerateStringExpression(inputStream, objTracker)),
Expression.Assign(typeHashCode, PrimitiveHelpers.ReadInt32(inputStream, objTracker)),
Expression.Assign(typeExpr, Expression.Call(SerializedTypeResolverMih.GetTypeFromFullName_String(), typeName)),
Expression.IfThen(Expression.NotEqual(typeHashCode, Expression.Property(typeExpr, "HashCode")),
Expression.Throw(Expression.New(TypeWasModifiedSinceSerializationException.GetConstructor(), typeExpr)))));
var invokeDeserializer = Expression.Invoke(deserializer, inputStream, objTracker);
Expression convertExpression = Expression.Convert(Expression.Call(SerializerMih.ConvertObjectToExpectedType(), invokeDeserializer, Expression.Constant(itemType)), itemType);
return(Expression.IfThenElse(Expression.Equal(Expression.Convert(PrimitiveHelpers.ReadByte(inputStream, objTracker), typeof(byte)), Expression.Constant(SerializerObjectTracker.Value0)),
Expression.Assign(leftSide, Expression.Constant(null, itemType)),
Expression.Block(
readType,
Expression.Assign(deserializer, Expression.Call(DeserializerMih.GetTypeToObjectDeserializer(), Expression.Property(typeExpr, "Type"))),
Expression.Assign(leftSide, convertExpression))));
}
