104 lines
3.8 KiB
C#
104 lines
3.8 KiB
C#
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#if !NO_RUNTIME
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using System;
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using System.Reflection;
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namespace ProtoBuf.Serializers
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{
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sealed class FieldDecorator : ProtoDecoratorBase
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{
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public override Type ExpectedType => forType;
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private readonly FieldInfo field;
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private readonly Type forType;
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public override bool RequiresOldValue => true;
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public override bool ReturnsValue => false;
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public FieldDecorator(Type forType, FieldInfo field, IProtoSerializer tail) : base(tail)
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{
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Helpers.DebugAssert(forType != null);
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Helpers.DebugAssert(field != null);
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this.forType = forType;
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this.field = field;
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}
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public override void Write(object value, ProtoWriter dest)
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{
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Helpers.DebugAssert(value != null);
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value = field.GetValue(value);
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if (value != null) Tail.Write(value, dest);
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}
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public override object Read(object value, ProtoReader source)
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{
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Helpers.DebugAssert(value != null);
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object newValue = Tail.Read((Tail.RequiresOldValue ? field.GetValue(value) : null), source);
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if (newValue != null) field.SetValue(value, newValue);
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return null;
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}
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#if FEAT_COMPILER
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protected override void EmitWrite(Compiler.CompilerContext ctx, Compiler.Local valueFrom)
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{
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ctx.LoadAddress(valueFrom, ExpectedType);
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ctx.LoadValue(field);
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ctx.WriteNullCheckedTail(field.FieldType, Tail, null);
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}
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protected override void EmitRead(Compiler.CompilerContext ctx, Compiler.Local valueFrom)
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{
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using (Compiler.Local loc = ctx.GetLocalWithValue(ExpectedType, valueFrom))
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{
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if (Tail.RequiresOldValue)
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{
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ctx.LoadAddress(loc, ExpectedType);
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ctx.LoadValue(field);
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}
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// value is either now on the stack or not needed
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ctx.ReadNullCheckedTail(field.FieldType, Tail, null);
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// the field could be a backing field that needs to be raised back to
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// the property if we're doing a full compile
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MemberInfo member = field;
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ctx.CheckAccessibility(ref member);
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bool writeValue = member is FieldInfo;
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if (writeValue)
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{
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if (Tail.ReturnsValue)
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{
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using (Compiler.Local newVal = new Compiler.Local(ctx, field.FieldType))
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{
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ctx.StoreValue(newVal);
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if (Helpers.IsValueType(field.FieldType))
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{
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ctx.LoadAddress(loc, ExpectedType);
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ctx.LoadValue(newVal);
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ctx.StoreValue(field);
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}
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else
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{
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Compiler.CodeLabel allDone = ctx.DefineLabel();
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ctx.LoadValue(newVal);
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ctx.BranchIfFalse(allDone, true); // interpret null as "don't assign"
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ctx.LoadAddress(loc, ExpectedType);
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ctx.LoadValue(newVal);
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ctx.StoreValue(field);
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ctx.MarkLabel(allDone);
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}
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}
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}
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}
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else
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{
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// can't use result
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if (Tail.ReturnsValue)
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{
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ctx.DiscardValue();
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}
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}
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}
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}
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#endif
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}
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}
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#endif
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