protected override void EmitRead(Compiler.CompilerContext ctx, Compiler.Local valueFrom)
{
using (Compiler.Local oldValue = ctx.GetLocalWithValue(expectedType, valueFrom))
using (Compiler.Local token = new Compiler.Local(ctx, ctx.MapType(typeof(SubItemToken))))
using (Compiler.Local field = new Compiler.Local(ctx, ctx.MapType(typeof(int))))
{
ctx.LoadReaderWriter();
ctx.EmitCall(ctx.MapType(typeof(ProtoReader)).GetMethod("StartSubItem"));
ctx.StoreValue(token);
Compiler.CodeLabel next = ctx.DefineLabel(), processField = ctx.DefineLabel(), end = ctx.DefineLabel();
ctx.MarkLabel(next);
ctx.EmitBasicRead("ReadFieldHeader", ctx.MapType(typeof(int)));
ctx.CopyValue();
ctx.StoreValue(field);
ctx.LoadValue(Tag); // = 1 - process
ctx.BranchIfEqual(processField, true);
ctx.LoadValue(field);
ctx.LoadValue(1); // < 1 - exit
ctx.BranchIfLess(end, false);
// default: skip
ctx.LoadReaderWriter();
ctx.EmitCall(ctx.MapType(typeof(ProtoReader)).GetMethod("SkipField"));
ctx.Branch(next, true);
// process
ctx.MarkLabel(processField);
if (Tail.RequiresOldValue)
{
if (expectedType.IsValueType)
{
ctx.LoadAddress(oldValue, expectedType);
ctx.EmitCall(expectedType.GetMethod("GetValueOrDefault", Helpers.EmptyTypes));
}
else
{
ctx.LoadValue(oldValue);
}
}
Tail.EmitRead(ctx, null);
// note we demanded always returns a value
if (expectedType.IsValueType)
{
ctx.EmitCtor(expectedType, Tail.ExpectedType); // re-nullable<T> it
}
ctx.StoreValue(oldValue);
ctx.Branch(next, false);
// outro
ctx.MarkLabel(end);
ctx.LoadValue(token);
ctx.LoadReaderWriter();
ctx.EmitCall(ctx.MapType(typeof(ProtoReader)).GetMethod("EndSubItem"));
ctx.LoadValue(oldValue); // load the old value
}
}
protected override void EmitRead(Compiler.CompilerContext ctx, Compiler.Local valueFrom)
{
Tail.EmitRead(ctx, valueFrom);
ctx.CopyValue();
Compiler.CodeLabel @nonEmpty = ctx.DefineLabel(), @end = ctx.DefineLabel();
ctx.LoadValue(typeof(string).GetProperty("Length"));
ctx.BranchIfTrue(@nonEmpty, true);
ctx.DiscardValue();
ctx.LoadNullRef();
ctx.Branch(@end, true);
ctx.MarkLabel(@nonEmpty);
ctx.EmitCtor(ctx.MapType(typeof(Uri)), ctx.MapType(typeof(string)));
ctx.MarkLabel(@end);
}
private static MethodBuilder EmitBoxedSerializer(TypeBuilder type, int i, Type valueType, SerializerPair[] methodPairs)
{
MethodInfo dedicated = methodPairs[i].Deserialize;
MethodBuilder boxedSerializer = type.DefineMethod("_" + i, MethodAttributes.Static, CallingConventions.Standard,
typeof(object), new Type[] { typeof(object), typeof(ProtoReader) });
Compiler.CompilerContext ctx = new Compiler.CompilerContext(boxedSerializer.GetILGenerator(), true, methodPairs);
ctx.LoadValue(Compiler.Local.InputValue);
Compiler.CodeLabel @null = ctx.DefineLabel();
ctx.BranchIfFalse(@null, true);
ctx.LoadValue(Compiler.Local.InputValue);
ctx.CastFromObject(valueType);
ctx.LoadReaderWriter();
ctx.EmitCall(dedicated);
ctx.CastToObject(valueType);
ctx.Return();
ctx.MarkLabel(@null);
using (Compiler.Local typedVal = new Compiler.Local(ctx, valueType))
{
// create a new valueType
ctx.LoadAddress(typedVal, valueType);
ctx.EmitCtor(valueType);
ctx.LoadValue(typedVal);
ctx.LoadReaderWriter();
ctx.EmitCall(dedicated);
ctx.CastToObject(valueType);
ctx.Return();
}
return(boxedSerializer);
}
private void EmitCreateIfNull(Compiler.CompilerContext ctx, Type type, Compiler.Local storage)
{
Helpers.DebugAssert(storage != null);
if (!type.IsValueType)
{
Compiler.CodeLabel afterNullCheck = ctx.DefineLabel();
ctx.LoadValue(storage);
ctx.BranchIfTrue(afterNullCheck, true);
// different ways of creating a new instance
bool callNoteObject = true;
if (factory != null)
{
EmitInvokeCallback(ctx, factory, false);
}
else if (!useConstructor)
{ // DataContractSerializer style
ctx.LoadValue(constructType);
ctx.EmitCall(ctx.MapType(typeof(BclHelpers)).GetMethod("GetUninitializedObject"));
ctx.Cast(forType);
}
else if (constructType.IsClass && hasConstructor)
{ // XmlSerializer style
ctx.EmitCtor(constructType);
}
else
{
ctx.LoadValue(type);
ctx.EmitCall(ctx.MapType(typeof(TypeModel)).GetMethod("ThrowCannotCreateInstance",
BindingFlags.Static | BindingFlags.Public));
ctx.LoadNullRef();
callNoteObject = false;
}
if (callNoteObject)
{
// track root object creation
ctx.CopyValue();
ctx.LoadReaderWriter();
ctx.EmitCall(ctx.MapType(typeof(ProtoReader)).GetMethod("NoteObject",
BindingFlags.Static | BindingFlags.Public));
}
if (baseCtorCallbacks != null)
{
for (int i = 0; i < baseCtorCallbacks.Length; i++)
{
EmitInvokeCallback(ctx, baseCtorCallbacks[i], true);
}
}
if (callbacks != null)
{
EmitInvokeCallback(ctx, callbacks.BeforeDeserialize, true);
}
ctx.StoreValue(storage);
ctx.MarkLabel(afterNullCheck);
}
}
private static MethodContext EmitBoxedSerializer(TypeBuilder type, int i, Type valueType, SerializerPair[] methodPairs, RuntimeTypeModel model, Compiler.CompilerContext.ILVersion ilVersion, string assemblyName)
{
MethodInfo dedicated = methodPairs[i].Deserialize;
string name = "_" + i.ToString();
MethodContext methodContext;
model.EmitDefineMethod(
type,
name,
MethodAttributes.Static,
CallingConventions.Standard,
model.MapType(typeof(object)),
new[]
{
new MethodContext.ParameterGenInfo(model.MapType(typeof(object)), "obj", 1),
new MethodContext.ParameterGenInfo(model.MapType(typeof(ProtoReader)), "source", 2),
},
false,
out methodContext);
Compiler.CompilerContext ctx = new Compiler.CompilerContext(methodContext, true, false, methodPairs, model, ilVersion, assemblyName, model.MapType(typeof(object)));
ctx.LoadValue(ctx.InputValue);
Compiler.CodeLabel @null = ctx.DefineLabel();
ctx.BranchIfFalse(@null, true);
Type mappedValueType = valueType;
ctx.LoadValue(ctx.InputValue);
ctx.CastFromObject(mappedValueType);
ctx.LoadReaderWriter();
ctx.EmitCall(dedicated);
ctx.CastToObject(mappedValueType);
ctx.Return();
ctx.MarkLabel(@null);
using (Compiler.Local typedVal = new Compiler.Local(ctx, mappedValueType))
{
// create a new valueType
ctx.LoadAddress(typedVal, mappedValueType);
ctx.EmitCtor(mappedValueType);
ctx.LoadValue(typedVal);
ctx.LoadReaderWriter();
ctx.EmitCall(dedicated);
ctx.CastToObject(mappedValueType);
ctx.Return();
}
return(methodContext);
}
void IProtoTypeSerializer.EmitCreateInstance(Compiler.CompilerContext ctx)
{
using (ctx.StartDebugBlockAuto(this))
{
// different ways of creating a new instance
bool callNoteObject = true;
if (_factory != null)
{
EmitInvokeCallback(ctx, _factory, false, _constructType, ExpectedType);
}
else if (!_useConstructor || (_useConstructor && !_hasConstructor))
{ // DataContractSerializer style
ctx.LoadValue(_constructType);
ctx.EmitCall(ctx.MapType(typeof(BclHelpers)).GetMethod("GetUninitializedObject"));
ctx.Cast(ExpectedType);
}
else if (_constructType.IsClass && _hasConstructor)
{ // XmlSerializer style
ctx.EmitCtor(_constructType);
}
else
{
ctx.LoadValue(ExpectedType);
ctx.EmitCall(
ctx.MapType(typeof(TypeModel)).GetMethod(
"ThrowCannotCreateInstance",
BindingFlags.Static | BindingFlags.Public));
ctx.LoadNullRef();
callNoteObject = false;
}
if (callNoteObject)
{
// track root object creation
ctx.CopyValue();
ctx.LoadReaderWriter();
ctx.EmitCall(
ctx.MapType(typeof(ProtoReader)).GetMethod(
"NoteObject",
BindingFlags.Static | BindingFlags.Public));
}
if (_baseCtorCallbacks != null)
{
for (int i = 0; i < _baseCtorCallbacks.Length; i++)
{
EmitInvokeCallback(ctx, _baseCtorCallbacks[i], true, null, ExpectedType);
}
}
}
}
static void EmitInvokeCallback(Compiler.CompilerContext ctx, MethodInfo method)
{
if (method != null)
{
ctx.CopyValue(); // assumes the target is on the stack, and that we want to *retain* it on the stack
#if PLAT_BINARYFORMATTER
if (method.GetParameters().Length == 1)
{
ctx.LoadValue((int)StreamingContextState);
ctx.EmitCtor(typeof(System.Runtime.Serialization.StreamingContext), new Type[] { typeof(System.Runtime.Serialization.StreamingContextStates) });
}
#endif
ctx.EmitCall(method);
}
}
void EmitCreateUnknownInstance(Compiler.CompilerContext ctx)
{
ctx.EmitCtor(unknownConstructType);
ctx.CopyValue();
ctx.LoadReaderWriter();
ctx.EmitCall(ctx.MapType(typeof(ProtoReader)).GetMethod("NoteObject",
BindingFlags.Static | BindingFlags.Public));
if (baseCtorCallbacks != null)
{
for (int i = 0; i < baseCtorCallbacks.Length; i++)
{
EmitInvokeCallback(ctx, baseCtorCallbacks[i], true, null, forType);
}
}
}
private void EmitCreateIfNull(Compiler.CompilerContext ctx, Type type, Compiler.Local storage)
{
Helpers.DebugAssert(storage != null);
if (!type.IsValueType)
{
Compiler.CodeLabel afterNullCheck = ctx.DefineLabel();
ctx.LoadValue(storage);
ctx.BranchIfTrue(afterNullCheck, true);
// different ways of creating a new instance
if (!useConstructor)
{ // DataContractSerializer style
ctx.LoadValue(forType);
ctx.EmitCall(typeof(BclHelpers).GetMethod("GetUninitializedObject"));
ctx.Cast(forType);
}
else if (type.IsClass && !type.IsAbstract && (
(type.GetConstructor(
BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public,
null, Helpers.EmptyTypes, null)) != null))
{ // XmlSerializer style
ctx.EmitCtor(type);
}
else
{
ctx.LoadValue(type);
ctx.EmitCall(typeof(TypeModel).GetMethod("ThrowCannotCreateInstance",
BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic));
ctx.LoadNullRef();
}
if (baseCtorCallbacks != null)
{
for (int i = 0; i < baseCtorCallbacks.Length; i++)
{
EmitInvokeCallback(ctx, baseCtorCallbacks[i]);
}
}
if (callbacks != null)
{
EmitInvokeCallback(ctx, callbacks.BeforeDeserialize);
}
ctx.StoreValue(storage);
ctx.MarkLabel(afterNullCheck);
}
}
void IProtoTypeSerializer.EmitCreateInstance(Compiler.CompilerContext ctx)
{
// different ways of creating a new instance
bool callNoteObject = true;
if (factory != null)
{
EmitInvokeCallback(ctx, factory, false, constructType, ExpectedType);
}
else if (!useConstructor)
{ // DataContractSerializer style
ctx.LoadValue(constructType);
ctx.EmitCall(typeof(BclHelpers).GetMethod("GetUninitializedObject"));
ctx.Cast(ExpectedType);
}
else if (Helpers.IsClass(constructType) && hasConstructor)
{ // XmlSerializer style
ctx.EmitCtor(constructType);
}
else
{
ctx.LoadValue(ExpectedType);
ctx.EmitCall(typeof(TypeModel).GetMethod("ThrowCannotCreateInstance",
BindingFlags.Static | BindingFlags.Public));
ctx.LoadNullRef();
callNoteObject = false;
}
if (callNoteObject)
{
// track root object creation
ctx.CopyValue();
ctx.LoadReader(false);
ctx.EmitCall(typeof(ProtoReader).GetMethod("NoteObject",
BindingFlags.Static | BindingFlags.Public));
}
if (baseCtorCallbacks != null)
{
for (int i = 0; i < baseCtorCallbacks.Length; i++)
{
EmitInvokeCallback(ctx, baseCtorCallbacks[i], true, null, ExpectedType);
}
}
}
private static void EmitReadAndAddItem(Compiler.CompilerContext ctx, Compiler.Local list, IProtoSerializer tail, MethodInfo add, bool castListForAdd)
{
ctx.LoadAddress(list, list.Type); // needs to be the reference in case the list is value-type (static-call)
if (castListForAdd)
{
ctx.Cast(add.DeclaringType);
}
Type itemType = tail.ExpectedType;
bool tailReturnsValue = tail.ReturnsValue;
if (tail.RequiresOldValue)
{
if (itemType.IsValueType || !tailReturnsValue)
{
// going to need a variable
using (Compiler.Local item = new Compiler.Local(ctx, itemType))
{
if (itemType.IsValueType)
{ // initialise the struct
ctx.LoadAddress(item, itemType);
ctx.EmitCtor(itemType);
}
else
{ // assign null
ctx.LoadNullRef();
ctx.StoreValue(item);
}
tail.EmitRead(ctx, item);
if (!tailReturnsValue)
{
ctx.LoadValue(item);
}
}
}
else
{ // no variable; pass the null on the stack and take the value *off* the stack
ctx.LoadNullRef();
tail.EmitRead(ctx, null);
}
}
else
{
if (tailReturnsValue)
{ // out only (on the stack); just emit it
tail.EmitRead(ctx, null);
}
else
{ // doesn't take anything in nor return anything! WTF?
throw new InvalidOperationException();
}
}
// our "Add" is chosen either to take the correct type, or to take "object";
// we may need to box the value
Type addParamType = add.GetParameters()[0].ParameterType;
if (addParamType != itemType)
{
if (addParamType == ctx.MapType(typeof(object)))
{
ctx.CastToObject(itemType);
}
else if (Helpers.GetUnderlyingType(addParamType) == itemType)
{ // list is nullable
ConstructorInfo ctor = Helpers.GetConstructor(addParamType, new Type[] { itemType }, false);
ctx.EmitCtor(ctor); // the itemType on the stack is now a Nullable<ItemType>
}
else
{
throw new InvalidOperationException("Conflicting item/add type");
}
}
ctx.EmitCall(add);
if (add.ReturnType != ctx.MapType(typeof(void)))
{
ctx.DiscardValue();
}
}
public void EmitRead(Compiler.CompilerContext ctx, Compiler.Local incoming)
{
using (Compiler.Local objValue = ctx.GetLocalWithValue(ExpectedType, incoming))
{
Compiler.Local[] locals = new Compiler.Local[members.Length];
try
{
for (int i = 0; i < locals.Length; i++)
{
Type type = GetMemberType(i);
bool store = true;
locals[i] = new Compiler.Local(ctx, type);
if (!ExpectedType.IsValueType)
{
// value-types always read the old value
if (type.IsValueType)
{
switch (Helpers.GetTypeCode(type))
{
case ProtoTypeCode.Boolean:
case ProtoTypeCode.Byte:
case ProtoTypeCode.Int16:
case ProtoTypeCode.Int32:
case ProtoTypeCode.SByte:
case ProtoTypeCode.UInt16:
case ProtoTypeCode.UInt32:
ctx.LoadValue(0);
break;
case ProtoTypeCode.Int64:
case ProtoTypeCode.UInt64:
ctx.LoadValue(0L);
break;
case ProtoTypeCode.Single:
ctx.LoadValue(0.0F);
break;
case ProtoTypeCode.Double:
ctx.LoadValue(0.0D);
break;
case ProtoTypeCode.Decimal:
ctx.LoadValue(0M);
break;
case ProtoTypeCode.Guid:
ctx.LoadValue(Guid.Empty);
break;
default:
ctx.LoadAddress(locals[i], type);
ctx.EmitCtor(type);
store = false;
break;
}
}
else
{
ctx.LoadNullRef();
}
if (store)
{
ctx.StoreValue(locals[i]);
}
}
}
Compiler.CodeLabel skipOld = ExpectedType.IsValueType
? new Compiler.CodeLabel()
: ctx.DefineLabel();
if (!ExpectedType.IsValueType)
{
ctx.LoadAddress(objValue, ExpectedType);
ctx.BranchIfFalse(skipOld, false);
}
for (int i = 0; i < members.Length; i++)
{
ctx.LoadAddress(objValue, ExpectedType);
switch (members[i].MemberType)
{
case MemberTypes.Field:
ctx.LoadValue((FieldInfo)members[i]);
break;
case MemberTypes.Property:
ctx.LoadValue((PropertyInfo)members[i]);
break;
}
ctx.StoreValue(locals[i]);
}
if (!ExpectedType.IsValueType)
{
ctx.MarkLabel(skipOld);
}
using (Compiler.Local fieldNumber = new Compiler.Local(ctx, ctx.MapType(typeof(int))))
{
Compiler.CodeLabel @continue = ctx.DefineLabel(),
processField = ctx.DefineLabel(),
notRecognised = ctx.DefineLabel();
ctx.Branch(@continue, false);
Compiler.CodeLabel[] handlers = new Compiler.CodeLabel[members.Length];
for (int i = 0; i < members.Length; i++)
{
handlers[i] = ctx.DefineLabel();
}
ctx.MarkLabel(processField);
ctx.LoadValue(fieldNumber);
ctx.LoadValue(1);
ctx.Subtract(); // jump-table is zero-based
ctx.Switch(handlers);
// and the default:
ctx.Branch(notRecognised, false);
for (int i = 0; i < handlers.Length; i++)
{
ctx.MarkLabel(handlers[i]);
IProtoSerializer tail = tails[i];
Compiler.Local oldValIfNeeded = tail.RequiresOldValue ? locals[i] : null;
ctx.ReadNullCheckedTail(locals[i].Type, tail, oldValIfNeeded);
if (tail.ReturnsValue)
{
if (locals[i].Type.IsValueType)
{
ctx.StoreValue(locals[i]);
}
else
{
Compiler.CodeLabel hasValue = ctx.DefineLabel(), allDone = ctx.DefineLabel();
ctx.CopyValue();
ctx.BranchIfTrue(hasValue, true); // interpret null as "don't assign"
ctx.DiscardValue();
ctx.Branch(allDone, true);
ctx.MarkLabel(hasValue);
ctx.StoreValue(locals[i]);
ctx.MarkLabel(allDone);
}
}
ctx.Branch(@continue, false);
}
ctx.MarkLabel(notRecognised);
ctx.LoadReaderWriter();
ctx.EmitCall(ctx.MapType(typeof(ProtoReader)).GetMethod("SkipField"));
ctx.MarkLabel(@continue);
ctx.EmitBasicRead("ReadFieldHeader", ctx.MapType(typeof(int)));
ctx.CopyValue();
ctx.StoreValue(fieldNumber);
ctx.LoadValue(0);
ctx.BranchIfGreater(processField, false);
}
for (int i = 0; i < locals.Length; i++)
{
ctx.LoadValue(locals[i]);
}
ctx.EmitCtor(ctor);
ctx.StoreValue(objValue);
}
finally
{
for (int i = 0; i < locals.Length; i++)
{
if (locals[i] != null)
{
locals[i].Dispose(); // release for re-use
}
}
}
}
}
private static MethodBuilder EmitBoxedSerializer(TypeBuilder type, int i, Type valueType, SerializerPair[] methodPairs, TypeModel model, Compiler.CompilerContext.ILVersion ilVersion, string assemblyName)
{
MethodInfo dedicated = methodPairs[i].Deserialize;
MethodBuilder boxedSerializer = type.DefineMethod("_" + i.ToString(), MethodAttributes.Static, CallingConventions.Standard,
model.MapType(typeof(object)), new Type[] { model.MapType(typeof(object)), model.MapType(typeof(ProtoReader)) });
Compiler.CompilerContext ctx = new Compiler.CompilerContext(boxedSerializer.GetILGenerator(), true, false, methodPairs, model, ilVersion, assemblyName, model.MapType(typeof(object)));
ctx.LoadValue(ctx.InputValue);
Compiler.CodeLabel @null = ctx.DefineLabel();
ctx.BranchIfFalse(@null, true);
Type mappedValueType = valueType;
ctx.LoadValue(ctx.InputValue);
ctx.CastFromObject(mappedValueType);
ctx.LoadReaderWriter();
ctx.EmitCall(dedicated);
ctx.CastToObject(mappedValueType);
ctx.Return();
ctx.MarkLabel(@null);
using (Compiler.Local typedVal = new Compiler.Local(ctx, mappedValueType))
{
// create a new valueType
ctx.LoadAddress(typedVal, mappedValueType);
ctx.EmitCtor(mappedValueType);
ctx.LoadValue(typedVal);
ctx.LoadReaderWriter();
ctx.EmitCall(dedicated);
ctx.CastToObject(mappedValueType);
ctx.Return();
}
return boxedSerializer;
}
private static MethodBuilder EmitBoxedSerializer(TypeBuilder type, int i, Type valueType, SerializerPair[] methodPairs)
{
MethodInfo dedicated = methodPairs[i].Deserialize;
MethodBuilder boxedSerializer = type.DefineMethod("_" + i, MethodAttributes.Static, CallingConventions.Standard,
typeof(object), new Type[] { typeof(object), typeof(ProtoReader) });
Compiler.CompilerContext ctx = new Compiler.CompilerContext(boxedSerializer.GetILGenerator(), true, false, methodPairs);
ctx.LoadValue(Compiler.Local.InputValue);
Compiler.CodeLabel @null = ctx.DefineLabel();
ctx.BranchIfFalse(@null, true);
ctx.LoadValue(Compiler.Local.InputValue);
ctx.CastFromObject(valueType);
ctx.LoadReaderWriter();
ctx.EmitCall(dedicated);
ctx.CastToObject(valueType);
ctx.Return();
ctx.MarkLabel(@null);
using(Compiler.Local typedVal = new Compiler.Local(ctx, valueType))
{
// create a new valueType
ctx.LoadAddress(typedVal, valueType);
ctx.EmitCtor(valueType);
ctx.LoadValue(typedVal);
ctx.LoadReaderWriter();
ctx.EmitCall(dedicated);
ctx.CastToObject(valueType);
ctx.Return();
}
return boxedSerializer;
}
private static void EmitReadAndAddItem(Compiler.CompilerContext ctx, Compiler.Local list, IProtoSerializer tail, MethodInfo add)
{
ctx.LoadValue(list);
Type itemType = tail.ExpectedType;
if (tail.RequiresOldValue)
{
if (itemType.IsValueType || !tail.ReturnsValue)
{
// going to need a variable
using (Compiler.Local item = new Compiler.Local(ctx, itemType))
{
if (itemType.IsValueType)
{ // initialise the struct
ctx.LoadAddress(item, itemType);
ctx.EmitCtor(itemType);
}
else
{ // assign null
ctx.LoadNullRef();
ctx.StoreValue(item);
}
tail.EmitRead(ctx, item);
if (!tail.ReturnsValue)
{
ctx.LoadValue(item);
}
}
}
else
{ // no variable; pass the null on the stack and take the value *off* the stack
ctx.LoadNullRef();
tail.EmitRead(ctx, null);
}
}
else
{
if (tail.ReturnsValue)
{ // out only (on the stack); just emit it
tail.EmitRead(ctx, null);
}
else
{ // doesn't take anything in nor return anything! WTF?
throw new InvalidOperationException();
}
}
// our "Add" is chosen either to take the correct type, or to take "object";
// we may need to box the value
Type addParamType = add.GetParameters()[0].ParameterType;
if (addParamType != itemType)
{
if (addParamType == typeof(object))
{
ctx.CastToObject(itemType);
}
else
{
throw new InvalidOperationException("Conflicting item/add type");
}
}
ctx.EmitCall(add);
if (add.ReturnType != typeof(void))
{
ctx.DiscardValue();
}
}
protected override void EmitRead(Compiler.CompilerContext ctx, Compiler.Local valueFrom)
{
using (ctx.StartDebugBlockAuto(this))
{
using (Compiler.Local oldValue = ctx.GetLocalWithValueForEmitRead(this, valueFrom))
{
Compiler.Local tempLocal = null;
Compiler.Local valueForTail;
Debug.Assert(Tail.RequiresOldValue || Tail.EmitReadReturnsValue);
if (Tail.RequiresOldValue)
{
if (_expectedType.IsValueType)
{
tempLocal = ctx.Local(Tail.ExpectedType);
ctx.LoadAddress(oldValue, _expectedType);
ctx.EmitCall(_expectedType.GetMethod("GetValueOrDefault", Helpers.EmptyTypes));
ctx.StoreValue(tempLocal);
valueForTail = tempLocal;
}
else
{
valueForTail = oldValue;
}
}
else
{
valueForTail = null;
}
// valueForTail contains:
// null: when not required old value
// oldValue local: when reference type
// tempLocal: when nullable value type
Tail.EmitRead(ctx, valueForTail);
if (_expectedType.IsValueType)
{
if (!Tail.EmitReadReturnsValue)
{
ctx.LoadValue(tempLocal);
}
// note we demanded always returns a value
ctx.EmitCtor(_expectedType, Tail.ExpectedType); // re-nullable<T> it
}
if (Tail.EmitReadReturnsValue || _expectedType.IsValueType)
{
ctx.StoreValue(oldValue);
}
if (EmitReadReturnsValue)
{
ctx.LoadValue(oldValue);
}
if (!tempLocal.IsNullRef())
{
tempLocal.Dispose();
}
}
}
}