C# Compiler.MarkLabel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);
 }

        protected override void EmitWrite(Compiler.CompilerContext ctx, Compiler.Local valueFrom)
        {
            if (getSpecified == null)
            {
                Tail.EmitWrite(ctx, valueFrom);
                return;
            }
            using (Compiler.Local loc = ctx.GetLocalWithValue(ExpectedType, valueFrom))
            {
                ctx.LoadAddress(loc, ExpectedType);
                ctx.EmitCall(getSpecified);
                Compiler.CodeLabel done = ctx.DefineLabel();
                ctx.BranchIfFalse(done, false);
                Tail.EmitWrite(ctx, loc);
                ctx.MarkLabel(done);
            }

        }

        protected override void EmitWrite(Compiler.CompilerContext ctx, Compiler.Local valueFrom)
        {
            using(Compiler.Local valOrNull = ctx.GetLocalWithValue(expectedType, valueFrom))
            using(Compiler.Local token = new Compiler.Local(ctx, ctx.MapType(typeof(SubItemToken))))
            {
                ctx.LoadNullRef();
                ctx.LoadReaderWriter();
                ctx.EmitCall(ctx.MapType(typeof(ProtoWriter)).GetMethod("StartSubItem"));
                ctx.StoreValue(token);
                
                if (Helpers.IsValueType(expectedType))
                {
                    ctx.LoadAddress(valOrNull, expectedType);
                    ctx.LoadValue(expectedType.GetProperty("HasValue"));
                }
                else
                {
                    ctx.LoadValue(valOrNull);
                }
                Compiler.CodeLabel @end = ctx.DefineLabel();
                ctx.BranchIfFalse(@end, false);
                if (Helpers.IsValueType(expectedType))
                {
                    ctx.LoadAddress(valOrNull, expectedType);
                    ctx.EmitCall(expectedType.GetMethod("GetValueOrDefault", Helpers.EmptyTypes));
                }
                else
                {
                    ctx.LoadValue(valOrNull);
                }
                Tail.EmitWrite(ctx, null);

                ctx.MarkLabel(@end);

                ctx.LoadValue(token);
                ctx.LoadReaderWriter();
                ctx.EmitCall(ctx.MapType(typeof(ProtoWriter)).GetMethod("EndSubItem"));
            }
        }

        public void EmitWrite(Compiler.CompilerContext ctx, Compiler.Local valueFrom)
        {
        	Compiler.CodeLabel @end = ctx.DefineLabel();

        	using (Compiler.Local value = ctx.GetLocalWithValue(ctor.DeclaringType, valueFrom))
            {
				if (!baseTupleAsReference && asReference)
				{
					using (Compiler.Local existing = new Compiler.Local(ctx, typeof(bool)))
					using (Compiler.Local tupleKey = new Compiler.Local(ctx, typeof(int)))
					{
						//int tupleKey = dest.NetCache.AddObjectKey(value, out existing);
						ctx.LoadReaderWriter();
						ctx.LoadValue(typeof(ProtoWriter).GetProperty("NetCache"));
						ctx.LoadValue(value);
						ctx.CastToObject(ctor.DeclaringType); // HACK : doesn't seem to get boxed from ctx.GetLocalWithValue
						ctx.LoadAddress(existing, typeof(bool));
						ctx.EmitCall(typeof(NetObjectCache).GetMethod("AddObjectKey", new Type[] { typeof(object), typeof(bool).MakeByRefType() }));
						ctx.StoreValue(tupleKey);

						//ProtoWriter.WriteUInt32(existing ? (uint) tupleKey : 0, dest);
						Compiler.CodeLabel @continueBranch = ctx.DefineLabel();
						ctx.LoadValue(0);
						ctx.LoadValue(existing);
						ctx.BranchIfFalse(@continueBranch, true);
						ctx.DiscardValue();
						ctx.LoadValue(tupleKey);
						//ctx.CastToObject(typeof(uint));
						ctx.MarkLabel(@continueBranch);
						ctx.LoadReaderWriter();
						ctx.EmitCall(typeof(ProtoWriter).GetMethod("WriteUInt32"));

						//if (existing) { return; }
						ctx.LoadValue(existing);
						ctx.BranchIfTrue(@end, false);
					}
				}

                for (int i = 0; i < tails.Length; i++)
                {
                    Type type = GetMemberType(i);
                    ctx.LoadAddress(value, ExpectedType);
                    switch(members[i].MemberType)
                    {
                        case MemberTypes.Field:
                            ctx.LoadValue((FieldInfo)members[i]);
                            break;
                        case MemberTypes.Property:
                            ctx.LoadValue((PropertyInfo)members[i]);
                            break;
                    }
                    ctx.WriteNullCheckedTail(type, tails[i], null);
                }
            }

			if (forceIssueFakeHeader)
			{
				ctx.LoadReaderWriter();
				ctx.EmitCall(typeof(ProtoWriter).GetMethod("WriteEndGroupFieldHeaderHack"));
			}

			ctx.MarkLabel(@end);
        }

 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);
        }

 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);
            }
        }

        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 (!useConstructor)
                {   // DataContractSerializer style
                    ctx.LoadValue(constructType);
                    ctx.EmitCall(typeof(BclHelpers).GetMethod("GetUninitializedObject"));
                    ctx.Cast(forType);
                }
                else if (constructType.IsClass && hasConstructor)
                {   // XmlSerializer style
                    ctx.EmitCtor(constructType);
                }
                else
                {
                    ctx.LoadValue(type);
                    ctx.EmitCall(typeof(TypeModel).GetMethod("ThrowCannotCreateInstance",
                        BindingFlags.Static | BindingFlags.Public));
                    ctx.LoadNullRef();
                    callNoteObject = false;
                }
                if (callNoteObject)
                {
                // track root object creation
                ctx.CopyValue();
                ctx.LoadReaderWriter();
                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]);
                    }
                }
                if (callbacks != null) EmitInvokeCallback(ctx, callbacks.BeforeDeserialize);
                ctx.StoreValue(storage);
                ctx.MarkLabel(afterNullCheck);
            }
        }

        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.........

        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"
        }

        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.........