void CreateCompareMethod(List <PropertySerializationInfo> properties)
{
const string endFalseLabel = "compareFailedLabel";
DynamicMethodHelper il = new DynamicMethodHelper(
"Compare_" + type.Name,
typeof(bool),
new Type[] { typeof(object), typeof(object) },
this.type
);
// Create calls to compare each member
foreach (PropertySerializationInfo propInfo in properties)
{
il.BeginScope();
propInfo.GenerateCompareIL(il, 0, 1);
il.EndScope();
il.GotoIfFalse(endFalseLabel);
}
// Return true if all properties passed (didn't goto endFalseLabel)
il.PushInt(Convert.ToInt32(true));
il.Return();
// Return false if any properties failed (did goto endFalseLabel)
il.MarkLabel(endFalseLabel);
il.PushInt(Convert.ToInt32(false));
il.Return();
this.compareMethod = (CompareMethod)il.Compile(typeof(CompareMethod));
}
/// <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);
}
}
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();
}
public void GenerateCompareIL(DynamicMethodHelper il, int xIndex, int yIndex)
{
#region Names
const string instanceX = "instanceX";
const string propVarX = "propValueX";
const string enumerableX = "enumerableX";
const string enumVarX = "enumX";
const string dictEnumVarX = "dictEnumX";
const string instanceY = "instanceY";
const string propVarY = "propValueY";
const string enumerableY = "enumerableY";
const string enumVarY = "enumY";
const string dictEnumVarY = "dictEnumY";
const string endFalseLabel = "logBadPropertyLabel";
const string endTrueLabel = "endTrue";
const string endLabel = "endLabel";
const string loopStart = "loopStart";
const string loopEnd = "loopEnd";
#endregion
il.DebugWriteLine("Comparing property " + this.Name);
il.DeclareLocal(instanceX, this.OwnerType);
il.PushArg(xIndex);
il.PopLocal(instanceX);
il.DeclareLocal(instanceY, this.OwnerType);
il.PushArg(yIndex);
il.PopLocal(instanceY);
il.DeclareLocal(propVarX, this.Type);
il.DeclareLocal(propVarY, this.Type);
if (this.classType != null)
{
il.CopyLocal(instanceX, propVarX);
il.CopyLocal(instanceY, propVarY);
}
else if (this.property is PropertyInfo)
{
PropertyInfo pi = (PropertyInfo)this.property;
MethodInfo getMethod = pi.GetGetMethod(true);
il.CallMethod(instanceX, getMethod);
il.PopLocal(propVarX);
il.CallMethod(instanceY, getMethod);
il.PopLocal(propVarY);
}
else
{
il.GetField(instanceX, this.property as FieldInfo);
il.PopLocal(propVarX);
il.GetField(instanceY, this.property as FieldInfo);
il.PopLocal(propVarY);
}
// For ref types, if both null or the same object then return true
// For value types, this is a value comparison
Type t = IsCollection ? (IsDictionary ? null : this.elementType) : this.Type;
bool doDefault = true;
if (t != null && t.IsValueType)
{
MethodInfo mi = t.GetMethod("op_Equality", new [] { t, t });
if (mi != null)
{
il.PushLocal(propVarX);
il.PushLocal(propVarY);
il.CallMethod(mi);
il.GotoIfFalse(endTrueLabel);
doDefault = false;
}
else if (t.IsGenericType && t.GetGenericTypeDefinition().Equals(typeof(Nullable<>)))
{
Type it = t.GetGenericArguments()[0];
mi = typeof(Nullable).GetMethod("Equals", BindingFlags.Public | BindingFlags.Static | BindingFlags.DeclaredOnly);
mi = mi.MakeGenericMethod(it);
il.PushLocal(propVarX);
il.PushLocal(propVarY);
il.CallMethod(mi);
il.GotoIfFalse(endTrueLabel);
doDefault = false;
}
}
if (doDefault)
{
il.PushLocal(propVarX);
il.PushLocal(propVarY);
il.GotoIfEqual(endTrueLabel);
}
if (IsCollection)
{
il.DeclareLocal(enumerableX, typeof(IEnumerable));
il.DeclareLocal(enumVarX, typeof(IEnumerator));
il.DeclareLocal(enumerableY, typeof(IEnumerable));
il.DeclareLocal(enumVarY, typeof(IEnumerator));
il.CopyLocal(propVarX, enumerableX);
il.CallMethod(enumerableX, "GetEnumerator");
il.PopLocal(enumVarX);
il.CopyLocal(propVarY, enumerableX);
il.CallMethod(enumerableX, "GetEnumerator");
il.PopLocal(enumVarY);
if (IsDictionary)
{
il.DeclareLocal(dictEnumVarX, typeof(IDictionaryEnumerator));
il.CopyLocal(enumVarX, dictEnumVarX);
il.DeclareLocal(dictEnumVarY, typeof(IDictionaryEnumerator));
il.CopyLocal(enumVarY, dictEnumVarY);
}
il.MarkLabel(loopStart);
il.CallMethod(enumVarX, "MoveNext");
il.GotoIfFalse(loopEnd);
il.CallMethod(enumVarY, "MoveNext");
il.GotoIfFalse(endFalseLabel); // y has less elements than x
if (IsDictionary)
{
il.CallMethod(dictEnumVarX, "get_Key");
il.CallMethod(dictEnumVarY, "get_Key");
GenerateCompareTypeIL(il, this.dictionaryKeyType);
il.GotoIfFalse(endFalseLabel);
il.CallMethod(dictEnumVarX, "get_Value");
il.CallMethod(dictEnumVarY, "get_Value");
GenerateCompareTypeIL(il, this.dictionaryValueType);
il.GotoIfFalse(endFalseLabel);
}
else // if (not dictionary)
{
il.CallMethod(enumVarX, "get_Current");
il.CallMethod(enumVarY, "get_Current");
GenerateCompareTypeIL(il, this.elementType);
il.GotoIfFalse(endFalseLabel);
}
il.Goto(loopStart);
il.MarkLabel(loopEnd);
// enumVarX has no more elements so enumVarY shouldn't
// have any more either
il.CallMethod(enumVarY, "MoveNext");
il.GotoIfTrue(endFalseLabel); // count mismatch
}
else // if (not collection)
{
il.PushLocalAsObject(propVarX);
il.PushLocalAsObject(propVarY);
GenerateCompareTypeIL(il, this.Type);
il.GotoIfFalse(endFalseLabel);
}
il.MarkLabel(endTrueLabel);
//il.DebugWriteLine(string.Format("Property {0} is equal", this.Name));
il.PushInt(1);
il.Goto(endLabel);
// Log out name of property if not equal
il.MarkLabel(endFalseLabel);
il.DebugWriteLine(string.Format("Property {0} is not equal", this.Name));
il.PushInt(0); // set success to false
il.MarkLabel(endLabel);
}