private static void EmitReadMethodContents(
ILGenerator gen,
Type formattedType,
FieldInfo dictField,
Dictionary <Type, FieldBuilder> serializerFields,
Dictionary <MemberInfo, List <string> > memberNames,
Dictionary <Type, MethodInfo> serializerReadMethods)
{
MethodInfo skipMethod = typeof(IDataReader).GetMethod("SkipEntry", Flags.InstancePublic);
MethodInfo tryGetValueMethod = typeof(Dictionary <string, int>).GetMethod("TryGetValue", Flags.InstancePublic);
//methodBuilder.DefineParameter(5, ParameterAttributes.None, "switchLookup");
LocalBuilder lookupResult = gen.DeclareLocal(typeof(int));
Label defaultLabel = gen.DefineLabel();
Label switchLabel = gen.DefineLabel();
Label endLabel = gen.DefineLabel();
Label[] switchLabels = memberNames.Select(n => gen.DefineLabel()).ToArray();
gen.Emit(OpCodes.Ldarg_1); // Load entryName string
gen.Emit(OpCodes.Ldnull); // Load null
gen.Emit(OpCodes.Ceq); // Equality check
gen.Emit(OpCodes.Brtrue, defaultLabel); // If entryName is null, go to default case
//gen.Emit(OpCodes.Ldarg, (short)4); // Load lookup dictionary argument (OLD CODE)
gen.Emit(OpCodes.Ldsfld, dictField); // Load lookup dictionary from static field on helper type
gen.Emit(OpCodes.Ldarg_1); // Load entryName string
gen.Emit(OpCodes.Ldloca, (short)lookupResult.LocalIndex); // Load address of lookupResult
gen.Emit(OpCodes.Callvirt, tryGetValueMethod); // Call TryGetValue on the dictionary
gen.Emit(OpCodes.Brtrue, switchLabel); // If TryGetValue returned true, go to the switch case
gen.Emit(OpCodes.Br, defaultLabel); // Else, go to the default case
gen.MarkLabel(switchLabel); // Switch starts here
gen.Emit(OpCodes.Ldloc, lookupResult); // Load lookupResult
gen.Emit(OpCodes.Switch, switchLabels); // Perform switch on switchLabels
int count = 0;
foreach (var member in memberNames.Keys)
{
var memberType = FormatterUtilities.GetContainedType(member);
var propInfo = member as PropertyInfo;
var fieldInfo = member as FieldInfo;
gen.MarkLabel(switchLabels[count]); // Switch case for [count] starts here
// Now we load the instance that we have to set the value on
gen.Emit(OpCodes.Ldarg_0); // Load value reference
if (formattedType.IsValueType == false)
{
gen.Emit(OpCodes.Ldind_Ref); // Indirectly load value of reference
}
// Now we deserialize the value itself
gen.Emit(OpCodes.Ldsfld, serializerFields[memberType]); // Load serializer from serializer container type
gen.Emit(OpCodes.Ldarg, (short)3); // Load reader argument
gen.Emit(OpCodes.Callvirt, serializerReadMethods[memberType]); // Call Serializer.ReadValue(IDataReader reader)
// The stack now contains the formatted instance and the deserialized value to set the member to
// Now we set the value
if (fieldInfo != null)
{
gen.Emit(OpCodes.Stfld, fieldInfo.DeAliasField()); // Set field
}
else if (propInfo != null)
{
gen.Emit(OpCodes.Callvirt, propInfo.DeAliasProperty().GetSetMethod(true)); // Call property setter
}
else
{
throw new NotImplementedException();
}
gen.Emit(OpCodes.Br, endLabel); // Jump to end of method
count++;
}
gen.MarkLabel(defaultLabel); // Default case starts here
gen.Emit(OpCodes.Ldarg, (short)3); // Load reader argument
gen.Emit(OpCodes.Callvirt, skipMethod); // Call IDataReader.SkipEntry
gen.MarkLabel(endLabel); // Method end starts here
gen.Emit(OpCodes.Ret); // Return method
}
private static Type BuildHelperType(
ModuleBuilder moduleBuilder,
string helperTypeName,
Type formattedType,
Dictionary <string, MemberInfo> serializableMembers,
out Dictionary <Type, MethodInfo> serializerReadMethods,
out Dictionary <Type, MethodInfo> serializerWriteMethods,
out Dictionary <Type, FieldBuilder> serializerFields,
out FieldBuilder dictField,
out Dictionary <MemberInfo, List <string> > memberNames)
{
TypeBuilder helperTypeBuilder = moduleBuilder.DefineType(helperTypeName, TypeAttributes.Public | TypeAttributes.Sealed | TypeAttributes.Class);
memberNames = new Dictionary <MemberInfo, List <string> >();
foreach (var entry in serializableMembers)
{
List <string> list;
if (memberNames.TryGetValue(entry.Value, out list) == false)
{
list = new List <string>();
memberNames.Add(entry.Value, list);
}
list.Add(entry.Key);
}
dictField = helperTypeBuilder.DefineField("SwitchLookup", typeof(Dictionary <string, int>), FieldAttributes.Public | FieldAttributes.Static | FieldAttributes.InitOnly);
List <Type> neededSerializers = memberNames.Keys.Select(n => FormatterUtilities.GetContainedType(n)).Distinct().ToList();
serializerReadMethods = new Dictionary <Type, MethodInfo>(neededSerializers.Count);
serializerWriteMethods = new Dictionary <Type, MethodInfo>(neededSerializers.Count);
serializerFields = new Dictionary <Type, FieldBuilder>(neededSerializers.Count);
foreach (var t in neededSerializers)
{
string name = t.GetCompilableNiceFullName() + "__Serializer";
int counter = 1;
while (serializerFields.Values.Any(n => n.Name == name))
{
counter++;
name = t.GetCompilableNiceFullName() + "__Serializer" + counter;
}
Type serializerType = typeof(Serializer <>).MakeGenericType(t);
serializerReadMethods.Add(t, serializerType.GetMethod("ReadValue", Flags.InstancePublicDeclaredOnly));
serializerWriteMethods.Add(t, serializerType.GetMethod("WriteValue", Flags.InstancePublicDeclaredOnly, null, new[] { typeof(string), t, typeof(IDataWriter) }, null));
serializerFields.Add(t, helperTypeBuilder.DefineField(name, serializerType, FieldAttributes.Public | FieldAttributes.Static | FieldAttributes.InitOnly));
}
//FieldBuilder readMethodFieldBuilder = helperTypeBuilder.DefineField("ReadMethod", readDelegateType, FieldAttributes.Public | FieldAttributes.Static | FieldAttributes.InitOnly);
//FieldBuilder writeMethodFieldBuilder = helperTypeBuilder.DefineField("WriteMethod", writeDelegateType, FieldAttributes.Public | FieldAttributes.Static | FieldAttributes.InitOnly);
// We generate a static constructor for our formatter helper type that initializes our switch lookup dictionary and our needed Serializer references
{
var addMethod = typeof(Dictionary <string, int>).GetMethod("Add", Flags.InstancePublic);
var dictionaryConstructor = typeof(Dictionary <string, int>).GetConstructor(Type.EmptyTypes);
var serializerGetMethod = typeof(Serializer).GetMethod("Get", Flags.StaticPublic, null, new[] { typeof(Type) }, null);
var typeOfMethod = typeof(Type).GetMethod("GetTypeFromHandle", Flags.StaticPublic, null, new Type[] { typeof(RuntimeTypeHandle) }, null);
ConstructorBuilder staticConstructor = helperTypeBuilder.DefineTypeInitializer();
ILGenerator gen = staticConstructor.GetILGenerator();
gen.Emit(OpCodes.Newobj, dictionaryConstructor); // Create new dictionary
int count = 0;
foreach (var entry in memberNames)
{
foreach (var name in entry.Value)
{
gen.Emit(OpCodes.Dup); // Load duplicate dictionary value
gen.Emit(OpCodes.Ldstr, name); // Load entry name
gen.Emit(OpCodes.Ldc_I4, count); // Load entry index
gen.Emit(OpCodes.Call, addMethod); // Call dictionary add
}
count++;
}
gen.Emit(OpCodes.Stsfld, dictField); // Set static dictionary field to dictionary value
foreach (var entry in serializerFields)
{
gen.Emit(OpCodes.Ldtoken, entry.Key); // Load type token
gen.Emit(OpCodes.Call, typeOfMethod); // Call typeof method (this pushes a type value onto the stack)
gen.Emit(OpCodes.Call, serializerGetMethod); // Call Serializer.Get(Type type) method
gen.Emit(OpCodes.Stsfld, entry.Value); // Set static serializer field to result of get method
}
gen.Emit(OpCodes.Ret); // Return
}
// Now we need to actually create the serializer container type so we can generate the dynamic methods below without getting TypeLoadExceptions up the wazoo
return(helperTypeBuilder.CreateType());
}