Refactor SimpleAST's References to be typed

src/Castle.Core/DynamicProxy/Contributors/ClassProxySerializableContributor.cs

@@ -1,4 +1,4 @@
-// Copyright 2004-2021 Castle Project - http://www.castleproject.org/
+// Copyright 2004-2025 Castle Project - http://www.castleproject.org/
 // 
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -129,7 +129,7 @@ private void EmitCustomGetObjectData(CodeBuilder codeBuilder, ArgumentReference
 			var getObjectData = new MethodInvocationExpression(
 				null,
 				FormatterServicesMethods.GetObjectData,
-				SelfReference.Self,
+				ThisExpression.Instance,
 				members);
 			codeBuilder.AddStatement(new AssignStatement(data, getObjectData));
 

src/Castle.Core/DynamicProxy/Contributors/ClassProxyTargetContributor.cs

@@ -1,4 +1,4 @@
-// Copyright 2004-2021 Castle Project - http://www.castleproject.org/
+// Copyright 2004-2025 Castle Project - http://www.castleproject.org/
 // 
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -122,7 +122,7 @@ private MethodBuilder CreateCallbackMethod(ClassEmitter emitter, MethodInfo meth
 
 			callBackMethod.CodeBuilder.AddStatement(
 				new ReturnStatement(
-					new MethodInvocationExpression(SelfReference.Self,
+					new MethodInvocationExpression(ThisExpression.Instance,
 					                               targetMethod,
 					                               callBackMethod.Arguments)));
 

src/Castle.Core/DynamicProxy/Contributors/InterfaceProxyWithoutTargetContributor.cs

@@ -1,4 +1,4 @@
-// Copyright 2004-2021 Castle Project - http://www.castleproject.org/
+// Copyright 2004-2025 Castle Project - http://www.castleproject.org/
 // 
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -119,7 +119,7 @@ private MethodInfo CreateCallbackMethod(ClassEmitter emitter, MethodInfo methodI
 
 			callBackMethod.CodeBuilder.AddStatement(
 				new ReturnStatement(
-					new MethodInvocationExpression(SelfReference.Self, targetMethod, callBackMethod.Arguments)));
+					new MethodInvocationExpression(ThisExpression.Instance, targetMethod, callBackMethod.Arguments)));
 
 			return callBackMethod.MethodBuilder;
 		}

src/Castle.Core/DynamicProxy/Contributors/ProxyTargetAccessorContributor.cs

@@ -1,4 +1,4 @@
-// Copyright 2004-2021 Castle Project - http://www.castleproject.org/
+// Copyright 2004-2025 Castle Project - http://www.castleproject.org/
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -25,12 +25,12 @@ namespace Castle.DynamicProxy.Contributors
 	/// </summary>
 	internal sealed class ProxyTargetAccessorContributor : ITypeContributor
 	{
-		private readonly Func<Reference> getTargetReference;
+		private readonly Func<IExpression> getTarget;
 		private readonly Type targetType;
 
-		public ProxyTargetAccessorContributor(Func<Reference> getTargetReference, Type targetType)
+		public ProxyTargetAccessorContributor(Func<IExpression> getTarget, Type targetType)
 		{
-			this.getTargetReference = getTargetReference;
+			this.getTarget = getTarget;
 			this.targetType = targetType;
 		}
 
@@ -41,17 +41,17 @@ public void CollectElementsToProxy(IProxyGenerationHook hook, MetaType model)
 		public void Generate(ClassEmitter emitter)
 		{
 			var interceptorsField = emitter.GetField("__interceptors");
-			var targetReference = getTargetReference();
+			var target = getTarget();
 
 			var dynProxyGetTarget = emitter.CreateMethod(nameof(IProxyTargetAccessor.DynProxyGetTarget), typeof(object));
 
 			dynProxyGetTarget.CodeBuilder.AddStatement(
-				new ReturnStatement(new ConvertExpression(typeof(object), targetType, targetReference)));
+				new ReturnStatement(new ConvertExpression(typeof(object), targetType, target)));
 
 			var dynProxySetTarget = emitter.CreateMethod(nameof(IProxyTargetAccessor.DynProxySetTarget), typeof(void), typeof(object));
 
 			// we can only change the target of the interface proxy
-			if (targetReference is FieldReference targetField)
+			if (target is FieldReference targetField)
 			{
 				dynProxySetTarget.CodeBuilder.AddStatement(
 					new AssignStatement(targetField,

src/Castle.Core/DynamicProxy/Generators/ClassProxyGenerator.cs

@@ -1,4 +1,4 @@
-// Copyright 2004-2021 Castle Project - http://www.castleproject.org/
+// Copyright 2004-2025 Castle Project - http://www.castleproject.org/
 // 
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -51,7 +51,7 @@ protected override CompositeTypeContributor GetProxyTargetContributor(INamingSco
 		protected override ProxyTargetAccessorContributor GetProxyTargetAccessorContributor()
 		{
 			return new ProxyTargetAccessorContributor(
-				getTargetReference: () => SelfReference.Self,
+				getTarget: () => ThisExpression.Instance,
 				targetType);
 		}
 	}

src/Castle.Core/DynamicProxy/Generators/ClassProxyWithTargetGenerator.cs

@@ -1,4 +1,4 @@
-// Copyright 2004-2021 Castle Project - http://www.castleproject.org/
+// Copyright 2004-2025 Castle Project - http://www.castleproject.org/
 // 
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -65,7 +65,7 @@ protected override CompositeTypeContributor GetProxyTargetContributor(INamingSco
 		protected override ProxyTargetAccessorContributor GetProxyTargetAccessorContributor()
 		{
 			return new ProxyTargetAccessorContributor(
-				getTargetReference: () => targetField,
+				getTarget: () => targetField,
 				targetType);
 		}
 

src/Castle.Core/DynamicProxy/Generators/CompositionInvocationTypeGenerator.cs

@@ -1,4 +1,4 @@
-// Copyright 2004-2021 Castle Project - http://www.castleproject.org/
+// Copyright 2004-2025 Castle Project - http://www.castleproject.org/
 // 
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -62,7 +62,7 @@ protected override void ImplementInvokeMethodOnTarget(AbstractTypeEmitter invoca
 		{
 			invokeMethodOnTarget.CodeBuilder.AddStatement(
 				new MethodInvocationExpression(
-					SelfReference.Self,
+					ThisExpression.Instance,
 					InvocationMethods.CompositionInvocationEnsureValidTarget));
 
 			base.ImplementInvokeMethodOnTarget(invocation, parameters, invokeMethodOnTarget, targetField);

src/Castle.Core/DynamicProxy/Generators/Emitters/SimpleAST/ArgumentReference.cs

@@ -21,7 +21,7 @@ namespace Castle.DynamicProxy.Generators.Emitters.SimpleAST
 	using System.Reflection.Emit;
 
 	[DebuggerDisplay("argument {Type}")]
-	internal class ArgumentReference : TypeReference
+	internal class ArgumentReference : Reference
 	{
 		public ArgumentReference(Type argumentType)
 			: base(argumentType)

src/Castle.Core/DynamicProxy/Generators/Emitters/SimpleAST/AsTypeReference.cs

@@ -27,6 +27,7 @@ internal class AsTypeReference : Reference
 		private readonly Type type;
 
 		public AsTypeReference(Reference reference, Type type)
+			: base(type)
 		{
 			this.reference = reference;
 			this.type = type;

src/Castle.Core/DynamicProxy/Generators/Emitters/SimpleAST/ByRefReference.cs

@@ -22,7 +22,7 @@ namespace Castle.DynamicProxy.Generators.Emitters.SimpleAST
 
 
 	[DebuggerDisplay("&{localReference}")]
-	internal class ByRefReference : TypeReference
+	internal class ByRefReference : Reference
 	{
 		private readonly LocalReference localReference;
 

src/Castle.Core/DynamicProxy/Generators/Emitters/SimpleAST/FieldReference.cs

@@ -28,6 +28,7 @@ internal class FieldReference : Reference
 		private readonly bool isStatic;
 
 		public FieldReference(FieldInfo field)
+			: base(field.FieldType)
 		{
 			this.field = field;
 			if ((field.Attributes & FieldAttributes.Static) != 0)
@@ -37,6 +38,7 @@ public FieldReference(FieldInfo field)
 		}
 
 		public FieldReference(FieldBuilder fieldBuilder)
+			: base(fieldBuilder.FieldType)
 		{
 			this.fieldBuilder = fieldBuilder;
 			field = fieldBuilder;
@@ -64,7 +66,7 @@ public override void EmitAddress(ILGenerator gen)
 			}
 			else
 			{
-				SelfReference.Self.Emit(gen);
+				ThisExpression.Instance.Emit(gen);
 				gen.Emit(OpCodes.Ldflda, Reference);
 			}
 		}
@@ -77,7 +79,7 @@ public override void Emit(ILGenerator gen)
 			}
 			else
 			{
-				SelfReference.Self.Emit(gen);
+				ThisExpression.Instance.Emit(gen);
 				gen.Emit(OpCodes.Ldfld, Reference);
 			}
 		}
@@ -91,7 +93,7 @@ public override void EmitStore(IExpression value, ILGenerator gen)
 			}
 			else
 			{
-				SelfReference.Self.Emit(gen);
+				ThisExpression.Instance.Emit(gen);
 				value.Emit(gen);
 				gen.Emit(OpCodes.Stfld, Reference);
 			}

src/Castle.Core/DynamicProxy/Generators/Emitters/SimpleAST/IndirectReference.cs

@@ -26,12 +26,12 @@ namespace Castle.DynamicProxy.Generators.Emitters.SimpleAST
 	///   ByRef and provides indirect load/store support.
 	/// </summary>
 	[DebuggerDisplay("&{OwnerReference}")]
-	internal class IndirectReference : TypeReference
+	internal class IndirectReference : Reference
 	{
-		private readonly TypeReference byRefReference;
+		private readonly Reference byRefReference;
 
-		public IndirectReference(TypeReference byRefReference)
-			: base(byRefReference.Type.GetElementType())
+		public IndirectReference(Reference byRefReference)
+			: base(byRefReference.Type.GetElementType()!)
 		{
 			if (!byRefReference.Type.IsByRef)
 			{
@@ -59,15 +59,15 @@ public override void EmitStore(IExpression value, ILGenerator gen)
 			OpCodeUtil.EmitStoreIndirectOpCodeForType(gen, Type);
 		}
 
-		public static TypeReference WrapIfByRef(TypeReference reference)
+		public static Reference WrapIfByRef(Reference reference)
 		{
 			return reference.Type.IsByRef ? new IndirectReference(reference) : reference;
 		}
 
 		// TODO: Better name
-		public static TypeReference[] WrapIfByRef(TypeReference[] references)
+		public static Reference[] WrapIfByRef(Reference[] references)
 		{
-			var result = new TypeReference[references.Length];
+			var result = new Reference[references.Length];
 
 			for (var i = 0; i < references.Length; i++)
 			{

src/Castle.Core/DynamicProxy/Generators/Emitters/SimpleAST/LocalReference.cs

@@ -21,7 +21,7 @@ namespace Castle.DynamicProxy.Generators.Emitters.SimpleAST
 	using System.Reflection.Emit;
 
 	[DebuggerDisplay("local {Type}")]
-	internal class LocalReference : TypeReference
+	internal class LocalReference : Reference
 	{
 		private LocalBuilder? localBuilder;
 

src/Castle.Core/DynamicProxy/Generators/Emitters/SimpleAST/MethodInvocationExpression.cs

@@ -23,26 +23,26 @@ internal class MethodInvocationExpression : IExpression, IStatement
 	{
 		protected readonly IExpression[] args;
 		protected readonly MethodInfo method;
-		protected readonly Reference? owner;
+		protected readonly IExpression? instance;
 
 		public MethodInvocationExpression(MethodInfo method, params IExpression[] args) :
-			this(SelfReference.Self, method, args)
+			this(ThisExpression.Instance, method, args)
 		{
 		}
 
 		public MethodInvocationExpression(MethodEmitter method, params IExpression[] args) :
-			this(SelfReference.Self, method.MethodBuilder, args)
+			this(ThisExpression.Instance, method.MethodBuilder, args)
 		{
 		}
 
-		public MethodInvocationExpression(Reference? owner, MethodEmitter method, params IExpression[] args) :
-			this(owner, method.MethodBuilder, args)
+		public MethodInvocationExpression(IExpression? instance, MethodEmitter method, params IExpression[] args)
+			: this(instance, method.MethodBuilder, args)
 		{
 		}
 
-		public MethodInvocationExpression(Reference? owner, MethodInfo method, params IExpression[] args)
+		public MethodInvocationExpression(IExpression? instance, MethodInfo method, params IExpression[] args)
 		{
-			this.owner = owner;
+			this.instance = instance;
 			this.method = method;
 			this.args = args;
 		}
@@ -51,7 +51,7 @@ public MethodInvocationExpression(Reference? owner, MethodInfo method, params IE
 
 		public void Emit(ILGenerator gen)
 		{
-			owner?.Emit(gen);
+			instance?.Emit(gen);
 
 			foreach (var exp in args)
 			{

src/Castle.Core/DynamicProxy/Generators/Emitters/SimpleAST/Reference.cs

@@ -16,10 +16,23 @@
 
 namespace Castle.DynamicProxy.Generators.Emitters.SimpleAST
 {
+	using System;
 	using System.Reflection.Emit;
 
 	internal abstract class Reference : IExpression
 	{
+		private readonly Type type;
+
+		protected Reference(Type type)
+		{
+			this.type = type;
+		}
+
+		public Type Type
+		{
+			get { return type; }
+		}
+
 		public abstract void EmitAddress(ILGenerator gen);
 
 		public abstract void Emit(ILGenerator gen);

src/Castle.Core/DynamicProxy/Generators/Emitters/SimpleAST/ReferencesToObjectArrayExpression.cs

@@ -24,9 +24,9 @@ namespace Castle.DynamicProxy.Generators.Emitters.SimpleAST
 
 	internal class ReferencesToObjectArrayExpression : IExpression
 	{
-		private readonly TypeReference[] args;
+		private readonly Reference[] args;
 
-		public ReferencesToObjectArrayExpression(params TypeReference[] args)
+		public ReferencesToObjectArrayExpression(params Reference[] args)
 		{
 			this.args = args;
 		}

src/Castle.Core/DynamicProxy/Generators/Emitters/SimpleAST/SelfReference.cs → src/Castle.Core/DynamicProxy/Generators/Emitters/SimpleAST/ThisExpression.cs

@@ -21,28 +21,17 @@ namespace Castle.DynamicProxy.Generators.Emitters.SimpleAST
 	using System.Reflection.Emit;
 
 	[DebuggerDisplay("this")]
-	internal class SelfReference : Reference
+	internal class ThisExpression : IExpression
 	{
-		public static readonly SelfReference Self = new SelfReference();
+		public static readonly ThisExpression Instance = new ThisExpression();
 
-		protected SelfReference()
+		protected ThisExpression()
 		{
 		}
 
-		public override void EmitAddress(ILGenerator gen)
-		{
-			throw new NotSupportedException();
-		}
-
-		public override void Emit(ILGenerator gen)
+		public void Emit(ILGenerator gen)
 		{
 			gen.Emit(OpCodes.Ldarg_0);
 		}
-
-		public override void EmitStore(IExpression value, ILGenerator gen)
-		{
-			// It does not make sense to assign a value to the this pointer.
-			throw new NotSupportedException();
-		}
 	}
 }