/// <summary>
/// Generates IL for serializing the property
/// </summary>
/// <param name="args">
/// <para>The arguments used to generate the il.</para>
/// </param>
public void GenerateWriteIL(GenerateArgs args)
{
#region Names
const string loopConditionLabel = "loopStart";
const string loopEndLabel = "loopEnd";
const string propVar = "propValue";
const string elemVar = "elemValue";
const string instanceVar = "instance";
const string collectionNotNullLabel = "collectionNotNullLabel";
const string countVar = "collectionCount";
const string enumVar = "enumerator";
const string dictEnumVar = "dictEnumerator";
const string dictKeyVar = "dictKey";
const string dictValueVar = "dictValue";
const string enumerableVar = "enumerable";
#endregion
DynamicMethodHelper il = args.il;
if (this.attribute.WriteMethod != null)
{
// Call custom handler
MethodInfo method = this.OwnerType.GetMethod(
this.attribute.WriteMethod,
BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.FlattenHierarchy,
null,
new [] { typeof(IPrimitiveWriter) },
null
);
if (method == null)
{
throw new ApplicationException(string.Format(
"Failed to locate method {0}.{1} to write property {2}",
this.OwnerType.Name,
this.attribute.ReadMethod,
this.Name
));
}
il.PushArg(args.instanceArg);
il.PushLocal(args.streamVar);
il.CallMethod(method);
return;
}
il.DeclareLocal(instanceVar, this.OwnerType);
il.DeclareLocal(propVar, this.Type);
il.PushArg(args.instanceArg);
il.PopLocal(instanceVar);
// Get property value and store in local
if (this.classType != null)
{
// For indexer load the instance itself
il.PushLocal(instanceVar);
}
else if (this.property is PropertyInfo)
{
il.PushLocal(instanceVar);
il.CallMethod(((PropertyInfo)this.property).GetGetMethod(true));
}
else // FieldInfo
{
// push instance
// load_field
il.GetField(instanceVar, (FieldInfo)this.property);
}
// store propValue
il.PopLocal(propVar);
// If this is a collection and null then store -1 length
// If this is a non-null collection then emit loop code
if (IsCollection)
{
il.DeclareLocal(countVar, typeof(int));
il.DeclareLocal(enumVar, typeof(IEnumerator));
il.DeclareLocal(enumerableVar, typeof(IEnumerable));
il.DeclareLocal(elemVar, this.elementType);
// push propValue
// push null
// branch_if_equal collectionNullLabel
// branch collectionNotNullLabel
il.PushLocal(propVar);
il.GotoIfTrue(collectionNotNullLabel);
// ; collection is null so write -1
// push writer
// push -1
// call IPrimitiveWriter.Write(int)
// goto loopEnd
il.PushLocal(args.streamVar);
il.PushInt(-1);
il.CallMethod(GetTypeMethod(typeof(int), TypeMethodType.Serialize));
il.Goto(loopEndLabel);
// :collectionNotNullLabel
il.MarkLabel(collectionNotNullLabel);
// countVar = collection.Length/Count
if (IsArray)
{
il.CallMethod(propVar, "get_Length");
}
else
{
il.PushLocal(propVar);
il.Cast(this.collectionInterfaceType);
il.CallMethod(this.collectionCountMethod);
}
il.PopLocal(countVar);
// writer.Write(countVar)
il.PushLocal(args.streamVar);
il.PushLocal(countVar);
il.CallMethod(GetTypeMethod(typeof(int), TypeMethodType.Serialize));
// enumerable = propVar
// enumVar = enumerable.GetEnumerator()
il.CopyLocal(propVar, enumerableVar);
il.CallMethod(enumerableVar, "GetEnumerator");
il.PopLocal(enumVar);
if (IsDictionary)
{
il.DeclareLocal(dictEnumVar, typeof(IDictionaryEnumerator));
il.DeclareLocal(dictKeyVar, this.dictionaryKeyType);
il.DeclareLocal(dictValueVar, this.dictionaryValueType);
il.CopyLocal(enumVar, dictEnumVar);
}
// :loopConditionLable
// if (enumVar.MoveNext == false) goto loopEndLabel
il.MarkLabel(loopConditionLabel);
il.CallMethod(enumVar, "MoveNext");
il.GotoIfFalse(loopEndLabel);
// if (!dictionary) elemVar = enumVar.Current
if (IsDictionary == false)
{
il.CallMethod(enumVar, "get_Current");
il.PopLocalFromObject(elemVar);
}
}
// For dictionary properties serialize the key and value
// For everything else serialize the element as-is
if (IsDictionary)
{
// push elemValue
// call get_Key
// serialize key
il.CallMethod(dictEnumVar, "get_Key");
this.GenerateWriteTypeIL(this.dictionaryKeyType, args);
// push elemValue
// call get_Value
// serialize value
il.CallMethod(dictEnumVar, "get_Value");
GenerateWriteTypeIL(this.dictionaryValueType, args);
}
else if (IsCollection)
{
// push elemValue
// serialize elemValue
il.PushLocalAsObject(elemVar);
GenerateWriteTypeIL(this.elementType, args);
}
else
{
il.PushLocalAsObject(propVar);
GenerateWriteTypeIL(this.elementType, args);
}
// Complete loop instructions for collection
if (IsCollection)
{
// branch loopConditionLabel
// :loopEnd
il.Goto(loopConditionLabel);
il.MarkLabel(loopEndLabel);
}
}
/// <summary>
/// Generates IL to write a single value from the stack to the stream
/// </summary>
/// <param name="type">Type of the object on the stack</param>
/// <param name="args">The generate args.</param>
void GenerateWriteTypeIL(Type type, GenerateArgs args)
{
MethodInfo method = GetTypeMethod(type, TypeMethodType.Serialize);
const string valueVar = "writeValue";
const string valueDoneLabel = "_writeValueDone";
DynamicMethodHelper il = args.il;
bool dynamic = IsDynamic && (type.IsValueType == false);
il.BeginScope();
{
il.DeclareLocal(valueVar, type);
il.PopLocalFromObject(valueVar);
if (dynamic)
{
const string notNullLabel = "_dynamicNotNull";
// If value is a reference type then serialize
// NullVersion (-1) and do nothing else. No need to
// save a type name or anything. If not null then
// add type to name table and write the type byte
// before calling serializer to write the instance
il.PushLocal(valueVar);
il.GotoIfTrue(notNullLabel);
il.PushLocal(args.streamVar);
il.PushInt(-1);
il.CallMethod(GetTypeMethod(typeof(byte), TypeMethodType.Serialize));
il.Goto(valueDoneLabel);
il.MarkLabel(notNullLabel);
// push writer for Write(byte) call
il.PushLocal(args.streamVar);
// push nameTable for Add(Type) call
il.DebugWriteNamedLocal(args.nameTableVar);
il.PushLocal(args.nameTableVar);
// push (object)value
// call object.GetType()
il.PushLocal(valueVar);
il.Cast(typeof(object));
il.CallMethod(typeof(object).GetMethod("GetType"));
// push this.Version
il.PushInt(this.Version);
// call TypeNameTable.Add(Type, version)
il.CallMethod(typeof(TypeNameTable).GetMethod("Add", new [] { typeof(Type), typeof(int) })); // Return type byte
// call IPrimitiveWriter.Write(byte)
il.CallMethod(GetTypeMethod(typeof(byte), TypeMethodType.Serialize));
}
if (method.DeclaringType == typeof(IPrimitiveWriter))
{
// push IPrimitiveWriter ; arg 1 for method call
// push elemValue ; arg 2 for method call
il.PushLocal(args.streamVar);
il.PushLocal(valueVar);
}
else
{
// push value
// push TypeSerializationArgs
il.PushLocal(valueVar);
il.PushArg(args.dataArg);
}
il.CallMethod(method);
if (dynamic)
{
il.MarkLabel(valueDoneLabel);
}
}
il.EndScope();
}
static void GenerateCompareTypeIL(DynamicMethodHelper il, Type t)
{
MethodInfo method = GetTypeMethod(t, TypeMethodType.Compare);
if ((method == null) && (t.IsPrimitive == false))
{
il.Pop();
il.Pop();
il.PushInt(1);
return;
}
il.BeginScope();
{
const string valX = "x";
const string valY = "y";
const string valThis = "_thisX";
const string trueLabel = "endTrue";
const string falseLabel = "endFalse";
const string endLabel = "endCheck";
il.DeclareLocal(valX, typeof(object));
il.PopLocal(valX);
il.DeclareLocal(valY, typeof(object));
il.PopLocal(valY);
// If both null or the same object then return true
il.PushLocal(valX);
il.PushLocal(valY);
il.GotoIfEqual(trueLabel);
// Exit false if either value is null
il.PushLocal(valX);
il.GotoIfFalse(falseLabel);
il.PushLocal(valY);
il.GotoIfFalse(falseLabel);
// Both operands are non-null so call the type-specific comparison method
if (t.IsPrimitive)
{
il.PushLocal(valX);
il.UnboxValueType(t);
il.PushLocal(valX);
il.UnboxValueType(t);
il.CompareEqual();
}
else
{
Type paramType = method.GetParameters()[0].ParameterType;
il.DebugWriteLine("Calling " + method);
if (method.IsStatic)
{
il.PushLocal(valX);
if (paramType.IsValueType) il.UnboxValueType(paramType);
}
else
{
il.DeclareLocal(valThis, t);
il.PushLocal(valX);
il.PopLocalFromObject(valThis);
il.PushThis(valThis, method);
}
il.PushLocal(valY);
if (paramType.IsValueType) il.UnboxValueType(paramType);
il.CallMethod(method);
}
il.GotoIfFalse(falseLabel);
il.MarkLabel(trueLabel);
il.PushInt(1);
il.Goto(endLabel);
il.MarkLabel(falseLabel);
il.DebugWriteLine("The following values are not equal:");
il.DebugWriteLocal(valX);
il.DebugWriteLocal(valY);
il.PushInt(0);
il.MarkLabel(endLabel);
}
il.EndScope();
}