C# Compiler.Branch方法代码示例

        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 (Helpers.IsValueType(expectedType))
                    {
                        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 (Helpers.IsValueType(expectedType))
                {
                    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(typeof(Uri), typeof(string));
     ctx.MarkLabel(@end);
     
 }

        protected override void EmitRead(Compiler.CompilerContext ctx, Compiler.Local valueFrom)
        {
            using (Compiler.Local loc = ctx.GetLocalWithValue(ExpectedType, valueFrom))
            {
                ctx.LoadAddress(loc, ExpectedType);
                if (Tail.RequiresOldValue)
                {
                    ctx.CopyValue();
                    ctx.LoadValue(field);  
                }
                // value is either now on the stack or not needed
                ctx.ReadNullCheckedTail(field.FieldType, Tail, null);

                if (Tail.ReturnsValue)
                {
                    if (field.FieldType.IsValueType)
                    {
                        // stack is now the return value
                        ctx.StoreValue(field);
                    }
                    else
                    {
                        
                        Compiler.CodeLabel hasValue = ctx.DefineLabel(), allDone = ctx.DefineLabel();
                        ctx.CopyValue();
                        ctx.BranchIfTrue(hasValue, true); // interpret null as "don't assign"

                        // no value, discard
                        ctx.DiscardValue();
                        ctx.DiscardValue();
                        ctx.Branch(allDone, true);

                        ctx.MarkLabel(hasValue);
                        ctx.StoreValue(field);
                        ctx.MarkLabel(allDone);
                    }
                }
                else
                {
                    ctx.DiscardValue();
                }
            }
        }

 protected override void EmitWrite(Compiler.CompilerContext ctx, Compiler.Local valueFrom)
 {
     Compiler.CodeLabel done = ctx.DefineLabel();
     if (valueFrom == null)
     {
         ctx.CopyValue(); // on the stack
         Compiler.CodeLabel needToPop = ctx.DefineLabel();
         EmitBranchIfDefaultValue(ctx, needToPop);
         Tail.EmitWrite(ctx, null);
         ctx.Branch(done, true);
         ctx.MarkLabel(needToPop);
         ctx.DiscardValue();
     }
     else
     {
         ctx.LoadValue(valueFrom); // variable/parameter
         EmitBranchIfDefaultValue(ctx, done);
         Tail.EmitWrite(ctx, valueFrom);
     }
     ctx.MarkLabel(done);
 }

 private static void WriteEnumValue(Compiler.CompilerContext ctx, TypeCode typeCode, Compiler.CodeLabel handler, Compiler.CodeLabel @continue, object value, Compiler.Local local)
 {
     ctx.MarkLabel(handler);
     WriteEnumValue(ctx, typeCode, value);
     ctx.StoreValue(local);
     ctx.Branch(@continue, false); // "continue"
 }

 void IProtoSerializer.EmitRead(Compiler.CompilerContext ctx, Compiler.Local valueFrom)
 {
     TypeCode typeCode = GetTypeCode();
     if (map == null)
     {
         ctx.EmitBasicRead("ReadInt32", typeof(int));
         ctx.ConvertFromInt32(typeCode);
     }
     else
     {
         int[] wireValues = new int[map.Length];
         object[] values = new object[map.Length];
         for (int i = 0; i < map.Length; i++)
         {
             wireValues[i] = map[i].WireValue;
             values[i] = map[i].Value;
         }
         using (Compiler.Local result = new Compiler.Local(ctx, ExpectedType))
         using (Compiler.Local wireValue = new Compiler.Local(ctx, typeof(int)))
         {
             ctx.EmitBasicRead("ReadInt32", typeof(int));
             ctx.StoreValue(wireValue);
             Compiler.CodeLabel @continue = ctx.DefineLabel();
             foreach (BasicList.Group group in BasicList.GetContiguousGroups(wireValues, values))
             {
                 Compiler.CodeLabel tryNextGroup = ctx.DefineLabel();
                 int groupItemCount = group.Items.Count;
                 if (groupItemCount == 1)
                 {
                     // discreet group; use an equality test
                     ctx.LoadValue(wireValue);
                     ctx.LoadValue(group.First);
                     Compiler.CodeLabel processThisValue = ctx.DefineLabel();
                     ctx.BranchIfEqual(processThisValue, true);
                     ctx.Branch(tryNextGroup, false);
                     WriteEnumValue(ctx, typeCode, processThisValue, @continue, group.Items[0], @result);
                 }
                 else
                 {
                     // implement as a jump-table-based switch
                     ctx.LoadValue(wireValue);
                     ctx.LoadValue(group.First);
                     ctx.Subtract(); // jump-tables are zero-based
                     Compiler.CodeLabel[] jmp = new Compiler.CodeLabel[groupItemCount];
                     for (int i = 0; i < groupItemCount; i++) {
                         jmp[i] = ctx.DefineLabel();
                     }
                     ctx.Switch(jmp);
                     // write the default...
                     ctx.Branch(tryNextGroup, false);
                     for (int i = 0; i < groupItemCount; i++)
                     {
                         WriteEnumValue(ctx, typeCode, jmp[i], @continue, group.Items[i], @result);
                     }
                 }
                 ctx.MarkLabel(tryNextGroup);
             }
             // throw source.CreateEnumException(ExpectedType, wireValue);
             ctx.LoadReaderWriter();
             ctx.LoadValue(ExpectedType);
             ctx.LoadValue(wireValue);
             ctx.EmitCall(typeof(ProtoReader).GetMethod("ThrowEnumException"));
             ctx.MarkLabel(@continue);
             ctx.LoadValue(result);
         }
     }
 }

        private void EmitWriteArrayLoop(Compiler.CompilerContext ctx, Compiler.Local i, Compiler.Local arr)
        {
            // i = 0
            ctx.LoadValue(0);
            ctx.StoreValue(i);

            // range test is last (to minimise branches)
            Compiler.CodeLabel loopTest = ctx.DefineLabel(), processItem = ctx.DefineLabel();
            ctx.Branch(loopTest, false);
            ctx.MarkLabel(processItem);

            // {...}
            ctx.LoadArrayValue(arr, i);
            if (SupportNull)
            {
                Tail.EmitWrite(ctx, null);
            }
            else
            {
                ctx.WriteNullCheckedTail(itemType, Tail, null);
            }

            // i++
            ctx.LoadValue(i);
            ctx.LoadValue(1);
            ctx.Add();
            ctx.StoreValue(i);

            // i < arr.Length
            ctx.MarkLabel(loopTest);
            ctx.LoadValue(i);
            ctx.LoadLength(arr, false);
            ctx.BranchIfLess(processItem, false);
        }

        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 (!Helpers.IsValueType(ExpectedType))
                        {
                            // value-types always read the old value
                            if (Helpers.IsValueType(type))
                            {
                                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 = Helpers.IsValueType(ExpectedType)
                                                        ? new Compiler.CodeLabel()
                                                        : ctx.DefineLabel();
                    if (!Helpers.IsValueType(ExpectedType))
                    {
                        ctx.LoadAddress(objValue, ExpectedType);
                        ctx.BranchIfFalse(skipOld, false);
                    }
                    for (int i = 0; i < members.Length; i++)
                    {
                        ctx.LoadAddress(objValue, ExpectedType);
                        if (members[i] is FieldInfo)
                        {
                            ctx.LoadValue((FieldInfo)members[i]);
                        }
                        else if (members[i] is PropertyInfo)
                        {
                            ctx.LoadValue((PropertyInfo)members[i]);
                        }
                        ctx.StoreValue(locals[i]);
                    }

                    if (!Helpers.IsValueType(ExpectedType)) 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);
//.........这里部分代码省略.........

        protected override void EmitRead(Compiler.CompilerContext ctx, Compiler.Local valueFrom)
        {

            bool writeValue;
            SanityCheck(ctx.Model, property, Tail, out writeValue, ctx.NonPublic, ctx.AllowInternal(property));
            if (ExpectedType.IsValueType && valueFrom == null)
            {
                throw new InvalidOperationException("Attempt to mutate struct on the head of the stack; changes would be lost");
            }

            ctx.LoadAddress(valueFrom, ExpectedType); // stack is: old-addr
            if (writeValue && Tail.RequiresOldValue)
            { // need to read and write
                ctx.CopyValue();
            }
            // stack is: [old-addr]|old-addr
            if (Tail.RequiresOldValue)
            {
                ctx.LoadValue(property); // stack is: [old-addr]|old-value
            }
            Type propertyType = property.PropertyType;
            ctx.ReadNullCheckedTail(propertyType, Tail, null); // stack is [old-addr]|[new-value]
            
            if (writeValue)
            {
                // stack is old-addr|new-value
                Compiler.CodeLabel @skip = new Compiler.CodeLabel(), allDone = new Compiler.CodeLabel(); // <=== default structs
                if (!propertyType.IsValueType)
                { // if the tail returns a null, intepret that as *no assign*
                    ctx.CopyValue(); // old-addr|new-value|new-value
                    @skip = ctx.DefineLabel();
                    allDone = ctx.DefineLabel();
                    ctx.BranchIfFalse(@skip, true); // old-addr|new-value
                }
                
                if (shadowSetter == null)
                {
                    ctx.StoreValue(property);
                }
                else
                {
                    ctx.EmitCall(shadowSetter);
                }
                if (!propertyType.IsValueType)
                {
                    ctx.Branch(allDone, true);

                    ctx.MarkLabel(@skip); // old-addr|new-value
                    ctx.DiscardValue();
                    ctx.DiscardValue();

                    ctx.MarkLabel(allDone);
                }

            }
            else
            { // don't want return value; drop it if anything there
                // stack is [new-value]
                if (Tail.ReturnsValue) { ctx.DiscardValue(); }
            }
        }

    	private void EmitReadArray(Compiler.CompilerContext ctx, Compiler.Local list, Compiler.Local oldArr,
    	                           Compiler.Local newArr, IProtoSerializer tail, MethodInfo add, Type listType)
		{
			Compiler.CodeLabel readPacked = packedWireType == WireType.None ? new Compiler.CodeLabel() : ctx.DefineLabel();
    		Compiler.CodeLabel @end = ctx.DefineLabel();
			
			if (packedWireType != WireType.None)
			{
				ctx.LoadReaderWriter();
				ctx.LoadValue(typeof(ProtoReader).GetProperty("WireType"));
				ctx.LoadValue((int)WireType.String);
				ctx.BranchIfEqual(readPacked, false);
			}

			using (Compiler.Local fieldNumber = new Compiler.Local(ctx, typeof(int)))
			{
				// int fieldNumber = source.FieldNumber;
				ctx.LoadReaderWriter();
				ctx.LoadValue(typeof (ProtoReader).GetProperty("FieldNumber"));
				ctx.StoreValue(fieldNumber);

				using (Compiler.Local readObject = new Compiler.Local(ctx, typeof (bool)))
				using (Compiler.Local arrayKey = new Compiler.Local(ctx, typeof (int)))
				{
					// bool readObject = true;
					ctx.LoadValue(true);
					ctx.StoreValue(readObject);

					// value = value ?? Array.CreateInstance(itemType, 0);
                    Compiler.CodeLabel @endCreateInstance = ctx.DefineLabel();

                    ctx.LoadValue(oldArr);
                    ctx.LoadNullRef();
                    ctx.TestEqual();
                    ctx.BranchIfFalse(@endCreateInstance, true);

                    ctx.LoadValue(itemType);
                    ctx.LoadValue(0);
                    ctx.EmitCall(typeof(Array).GetMethod("CreateInstance", new Type[] { typeof(Type), typeof(int) }));
                    ctx.StoreValue(oldArr);

                    ctx.MarkLabel(@endCreateInstance);                    

					if (AsReference)
					{
                        using (Compiler.Local objectKey = new Compiler.Local(ctx, typeof(int)))
                        {
                            //int objectKey = source.ReadInt32();
                            ctx.LoadReaderWriter();
                            ctx.EmitCall(typeof(ProtoReader).GetMethod("ReadInt32"));
                            ctx.StoreValue(objectKey);

                            Compiler.CodeLabel @ifNotThere = ctx.DefineLabel();
                            Compiler.CodeLabel @endIf = ctx.DefineLabel();

                            //if (objectKey > 0)
                            ctx.LoadValue(objectKey);
                            ctx.LoadValue(0);
                            ctx.BranchIfLessOrEqual(@ifNotThere, true);

                            // value = source.NetCache.GetKeyedObject(objectKey);
                            ctx.LoadReaderWriter();
                            ctx.LoadValue(typeof(ProtoReader).GetProperty("NetCache"));
                            ctx.LoadValue(objectKey);
                            ctx.EmitCall(typeof(NetObjectCache).GetMethod("GetKeyedObject"));
                            ctx.StoreValue(oldArr);

                            //readObject = false;
                            ctx.LoadValue(false);
                            ctx.StoreValue(readObject);

                            //}
                            ctx.Branch(@endIf, true);

                            //else
                            ctx.MarkLabel(@ifNotThere);

                            //bool dummy;
                            //arrayKey = source.NetCache.AddObjectKey(value, out dummy);
                            using (Compiler.Local dummy = new Compiler.Local(ctx, typeof(bool)))
                            {
                                ctx.LoadReaderWriter();
                                ctx.LoadValue(typeof(ProtoReader).GetProperty("NetCache"));
                                ctx.LoadValue(oldArr);
                                ctx.LoadAddress(dummy, typeof(bool));
                                ctx.EmitCall(typeof(NetObjectCache).GetMethod("AddObjectKey", new Type[] { typeof(object), typeof(bool).MakeByRefType() }));
                                ctx.StoreValue(arrayKey);
                            }

                            ctx.MarkLabel(@endIf);
                        }
					}
					else
					{
                        using (Compiler.Local readValue = new Compiler.Local(ctx, typeof(int)))
                        {
                            ctx.LoadReaderWriter();
                            ctx.EmitCall(typeof(ProtoReader).GetMethod("ReadInt32"));
                            ctx.StoreValue(readValue);

//.........这里部分代码省略.........

        private void WriteFieldHandler(
            Compiler.CompilerContext ctx, Type expected, Compiler.Local loc,
            Compiler.CodeLabel handler, Compiler.CodeLabel @continue, IProtoSerializer serializer)
        {
            ctx.MarkLabel(handler);
            if (serializer.ExpectedType == forType) {
                EmitCreateIfNull(ctx, expected, loc);
                serializer.EmitRead(ctx, loc);
            }
            else {
                ctx.LoadValue(loc);
                ctx.Cast(serializer.ExpectedType);
                serializer.EmitRead(ctx, null);
            }

            if (serializer.ReturnsValue)
            {   // update the variable
                ctx.StoreValue(loc);
            }
            ctx.Branch(@continue, false); // "continue"
        }

 void IProtoTypeSerializer.EmitCallback(Compiler.CompilerContext ctx, Compiler.Local valueFrom, TypeModel.CallbackType callbackType)
 {
     Helpers.DebugAssert(((IProtoTypeSerializer)this).HasCallbacks(callbackType), "Shouldn't be calling this if there is nothing to do");
     MethodInfo method = callbacks == null ? null : callbacks[callbackType];
     ctx.LoadValue(valueFrom);
     EmitInvokeCallback(ctx, method);
     Compiler.CodeLabel @break = ctx.DefineLabel();
     if (CanHaveInheritance)
     {
         for (int i = 0; i < serializers.Length; i++)
         {
             IProtoSerializer ser = serializers[i];
             IProtoTypeSerializer typeser;
             if (ser.ExpectedType != forType && (typeser = (IProtoTypeSerializer)ser).HasCallbacks(callbackType))
             {
                 Compiler.CodeLabel ifMatch = ctx.DefineLabel(), nextTest = ctx.DefineLabel();
                 ctx.CopyValue();
                 ctx.TryCast(ser.ExpectedType);
                 ctx.CopyValue();
                 ctx.BranchIfTrue(ifMatch, true);
                 ctx.DiscardValue();
                 ctx.Branch(nextTest, false);
                 ctx.MarkLabel(ifMatch);
                 typeser.EmitCallback(ctx, null, callbackType);
                 ctx.Branch(@break, false);
                 ctx.MarkLabel(nextTest);
             }
         }
     }
     ctx.MarkLabel(@break);
     ctx.DiscardValue();
 }

        void IProtoSerializer.EmitWrite(Compiler.CompilerContext ctx, Compiler.Local valueFrom)
        {
            Type expected = ExpectedType;
            using (Compiler.Local loc = ctx.GetLocalWithValue(expected, valueFrom))
            {
                // pre-callbacks
                EmitCallbackIfNeeded(ctx, loc, TypeModel.CallbackType.BeforeSerialize);

                Compiler.CodeLabel startFields = ctx.DefineLabel();
                // inheritance
                if (CanHaveInheritance)
                {
                    for (int i = 0; i < serializers.Length; i++)
                    {
                        IProtoSerializer ser = serializers[i];
                        if (ser.ExpectedType != forType)
                        {
                            Compiler.CodeLabel ifMatch = ctx.DefineLabel(), nextTest = ctx.DefineLabel();
                            ctx.LoadValue(loc);
                            ctx.TryCast(ser.ExpectedType);
                            ctx.CopyValue();
                            ctx.BranchIfTrue(ifMatch, true);
                            ctx.DiscardValue();
                            ctx.Branch(nextTest, true);
                            ctx.MarkLabel(ifMatch);
                            ser.EmitWrite(ctx, null);
                            ctx.Branch(startFields, false);
                            ctx.MarkLabel(nextTest);
                        }
                    }

                    if (constructType != null && constructType != forType)
                    {
                        using(Compiler.Local actualType = new Compiler.Local(ctx, typeof(Type)))
                        {
                            // would have jumped to "fields" if an expected sub-type, so two options:
                            // a: *exactly* that type, b: an *unexpected* type
                            ctx.LoadValue(loc);
                            ctx.EmitCall(typeof(object).GetMethod("GetType"));
                            ctx.CopyValue();
                            ctx.StoreValue(actualType);
                            ctx.LoadValue(forType);
                            ctx.BranchIfEqual(startFields, true);

                            ctx.LoadValue(actualType);
                            ctx.LoadValue(constructType);
                            ctx.BranchIfEqual(startFields, true);
                        }
                    }
                    else
                    {
                        // would have jumped to "fields" if an expected sub-type, so two options:
                        // a: *exactly* that type, b: an *unexpected* type
                        ctx.LoadValue(loc);
                        ctx.EmitCall(typeof(object).GetMethod("GetType"));
                        ctx.LoadValue(forType);
                        ctx.BranchIfEqual(startFields, true);
                    }
                    // unexpected, then... note that this *might* be a proxy, which
                    // is handled by ThrowUnexpectedSubtype
                    ctx.LoadValue(forType);
                    ctx.LoadValue(loc);
                    ctx.EmitCall(typeof(object).GetMethod("GetType"));
                    ctx.EmitCall(typeof(TypeModel).GetMethod("ThrowUnexpectedSubtype",
                        BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Static));

                }
                // fields

                ctx.MarkLabel(startFields);
                for (int i = 0; i < serializers.Length; i++)
                {
                    IProtoSerializer ser = serializers[i];
                    if (ser.ExpectedType == forType) ser.EmitWrite(ctx, loc);
                }

                // extension data
                if (isExtensible)
                {
                    ctx.LoadValue(loc);
                    ctx.LoadReaderWriter();
                    ctx.EmitCall(typeof(ProtoWriter).GetMethod("AppendExtensionData"));
                }
                // post-callbacks
                EmitCallbackIfNeeded(ctx, loc, TypeModel.CallbackType.AfterSerialize);
            }
        }

        protected override void EmitRead(Compiler.CompilerContext ctx, Compiler.Local valueFrom)
        {
            using (Compiler.Local oldList = AppendToCollection ? ctx.GetLocalWithValue(ExpectedType, valueFrom) : null)
            using(Compiler.Local builder = new Compiler.Local(ctx, builderFactory.ReturnType))
            {
                ctx.EmitCall(builderFactory);
                ctx.StoreValue(builder);

                if(AppendToCollection)
                {
                    Compiler.CodeLabel done = ctx.DefineLabel();
                    if(!ExpectedType.IsValueType)
                    {
                        ctx.LoadValue(oldList);
                        ctx.BranchIfFalse(done, false); // old value null; nothing to add
                    }
                    PropertyInfo prop = Helpers.GetProperty(ExpectedType, "Length", false);
                    if(prop == null) prop = Helpers.GetProperty(ExpectedType, "Count", false);
#if !NO_GENERICS
                    if (prop == null) prop = Helpers.GetProperty(ResolveIReadOnlyCollection(ExpectedType, Tail.ExpectedType), "Count", false);
#endif
                    ctx.LoadAddress(oldList, oldList.Type);
                    ctx.EmitCall(Helpers.GetGetMethod(prop, false, false));
                    ctx.BranchIfFalse(done, false); // old list is empty; nothing to add

                    Type voidType = ctx.MapType(typeof(void));
                    if(addRange != null)
                    {
                        ctx.LoadValue(builder);
                        ctx.LoadValue(oldList);
                        ctx.EmitCall(addRange);
                        if (addRange.ReturnType != null && add.ReturnType != voidType) ctx.DiscardValue();
                    }
                    else
                    {
                        // loop and call Add repeatedly
                        MethodInfo moveNext, current, getEnumerator = GetEnumeratorInfo(ctx.Model, out moveNext, out current);
                        Helpers.DebugAssert(moveNext != null);
                        Helpers.DebugAssert(current != null);
                        Helpers.DebugAssert(getEnumerator != null);

                        Type enumeratorType = getEnumerator.ReturnType;
                        using (Compiler.Local iter = new Compiler.Local(ctx, enumeratorType))
                        {
                            ctx.LoadAddress(oldList, ExpectedType);
                            ctx.EmitCall(getEnumerator);
                            ctx.StoreValue(iter);
                            using (ctx.Using(iter))
                            {
                                Compiler.CodeLabel body = ctx.DefineLabel(), next = ctx.DefineLabel();
                                ctx.Branch(next, false);

                                ctx.MarkLabel(body);
                                ctx.LoadAddress(builder, builder.Type);
                                ctx.LoadAddress(iter, enumeratorType);                                
                                ctx.EmitCall(current);
                                ctx.EmitCall(add);
                                if (add.ReturnType != null && add.ReturnType != voidType) ctx.DiscardValue();

                                ctx.MarkLabel(@next);
                                ctx.LoadAddress(iter, enumeratorType);
                                ctx.EmitCall(moveNext);
                                ctx.BranchIfTrue(body, false);
                            }
                        }
                    }


                    ctx.MarkLabel(done);
                }

                EmitReadList(ctx, builder, Tail, add, packedWireType, false);

                ctx.LoadAddress(builder, builder.Type);
                ctx.EmitCall(finish);
                if(ExpectedType != finish.ReturnType)
                {
                    ctx.Cast(ExpectedType);
                }
            }
        }

        public void EmitRead(Compiler.CompilerContext ctx, Compiler.Local incoming)
        {
			bool issueReferenceDirectives = !baseTupleAsReference && asReference;
        	
			Compiler.CodeLabel @end = ctx.DefineLabel();

			using (Compiler.Local tupleKey = new Compiler.Local(ctx, typeof(int)))
			using (Compiler.Local oldTuple = new Compiler.Local(ctx, typeof(object)))
			using (Compiler.Local objValue = ctx.GetLocalWithValue(ExpectedType, incoming))
			{
				Compiler.Local[] locals = new Compiler.Local[members.Length];
				try
				{
					if (issueReferenceDirectives)
					{
						//int tupleKey = 0;
						ctx.LoadValue(0);
						ctx.StoreValue(tupleKey);

						//object oldTuple = null;
						ctx.LoadNullRef();
						ctx.StoreValue(oldTuple);

						//tupleKey = (int)source.ReadUInt32();
						ctx.LoadReaderWriter();
						ctx.EmitCall(typeof (ProtoReader).GetMethod("ReadUInt32"));
						//ctx.CastToObject(typeof (int));
						ctx.StoreValue(tupleKey);

						Compiler.CodeLabel @objectNotFound = ctx.DefineLabel();

						ctx.LoadValue(tupleKey);
						ctx.LoadValue(0);
						ctx.BranchIfEqual(@objectNotFound, true);

						//// return source.NetCache.GetKeyedObject(tupleKey);
						ctx.LoadReaderWriter();
						ctx.LoadValue(typeof (ProtoReader).GetProperty("NetCache"));
						ctx.LoadValue(tupleKey);
						ctx.EmitCall(typeof (NetObjectCache).GetMethod("GetKeyedObject"));
						ctx.CastFromObject(ExpectedType);
						ctx.StoreValue(objValue);
						ctx.Branch(@end, false);

						ctx.MarkLabel(@objectNotFound);

						ctx.EmitCtor(typeof (object));
						ctx.StoreValue(oldTuple);

						// tupleKey = source.NetCache.AddObjectKey(oldTuple, out dummy);
						using (Compiler.Local dummy = new Compiler.Local(ctx, typeof (bool)))
						{
							ctx.LoadReaderWriter();
							ctx.LoadValue(typeof (ProtoReader).GetProperty("NetCache"));
							ctx.LoadValue(oldTuple);
							ctx.LoadAddress(dummy, typeof (bool));
							ctx.EmitCall(typeof (NetObjectCache).GetMethod("AddObjectKey", new Type[] { typeof(object), typeof(bool).MakeByRefType() }));
							ctx.StoreValue(tupleKey);
						}
					}

					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);
//.........这里部分代码省略.........