dotnet · simonrozsival · May 27, 2026 · May 22, 2026 · May 22, 2026 · May 22, 2026
@@ -13,7 +13,7 @@ namespace Xamarin.Android.Tools.Aidl_Tests
 {
 	public class AidlCompilerTestBase
 	{
-		protected void RunTest (string name)
+		protected void RunTest (string name, ParcelableHandling parcelableHandling = ParcelableHandling.Ignore)
 		{
 			var root = Path.GetDirectoryName (Assembly.GetExecutingAssembly ().Location);
 			var file = Path.Combine (root, "TestData", name + ".txt");
@@ -22,7 +22,7 @@ protected void RunTest (string name)
 			(var input, var expected_output) = SplitTestFile (text);
 
 			var compiler = new AidlCompiler ();
-			var results = compiler.Run (input, out var output);
+			var results = compiler.Run (input, out var output, parcelableHandling: parcelableHandling);
 
 			Assert.False (results.LogMessages.Any ());
 

@@ -0,0 +1,61 @@
+using System;
+using System.Linq;
+using NUnit.Framework;
+using Xamarin.Android.Tools.Aidl;
+
+namespace Xamarin.Android.Tools.Aidl_Tests
+{
+	// Tests targeting specific code paths of Xamarin.Android.Tools.Aidl.CSharpCodeGenerator.
+	// These exist so we don't need to go through the MSBuild integration tests in AidlTest.cs
+	// to validate generator behavior.
+	[TestFixture]
+	public class CSharpCodeGeneratorTests : AidlCompilerTestBase
+	{
+		[Test]
+		public void ParcelableIgnore () => RunTest (nameof (ParcelableIgnore), ParcelableHandling.Ignore);
+
+		[Test]
+		public void ParcelableStub () => RunTest (nameof (ParcelableStub), ParcelableHandling.Stub);
+
+		[Test]
+		public void ParcelableError ()
+		{
+			const string input = @"package com.xamarin.test;
+parcelable MyData;
+";
+			var compiler = new AidlCompiler ();
+			Assert.Throws<InvalidOperationException> (() =>
+				compiler.Run (input, out _, parcelableHandling: ParcelableHandling.Error));
+		}
+
+		[Test]
+		public void MultipleInterfaces () => RunTest (nameof (MultipleInterfaces));
+
+		// NOTE: This test intentionally snapshots the *current* generator behavior for `oneway` methods.
+		// The generated Proxy still allocates a reply Parcel and calls `__reply.ReadException ()`, which
+		// does not match true AIDL oneway semantics. Tracked by https://github.com/dotnet/android/issues/11507.
+		[Test]
+		public void OnewayMethods () => RunTest (nameof (OnewayMethods));
+
+		// NOTE: The golden output for this test also captures a pre-existing bug where the generated
+		// Proxy void method allocates `__reply` but never recycles it, leaking Parcel instances.
+		// Tracked by https://github.com/dotnet/android/issues/11508.
+		[Test]
+		public void IBinderTypes () => RunTest (nameof (IBinderTypes));
+
+		[Test]
+		public void CharSequenceType () => RunTest (nameof (CharSequenceType));
+
+		[Test]
+		public void ParseErrorIsReported ()
+		{
+			const string input = "this is not valid aidl @@@";
+
+			var compiler = new AidlCompiler ();
+			var results = compiler.Run (input, out var output);
+
+			Assert.IsNull (output, "Output should be null when the input fails to parse.");
+			Assert.IsTrue (results.LogMessages.Any (), "Parser error messages should be reported.");
+		}
+	}
+}
@@ -0,0 +1,151 @@
+package com.xamarin.test;
+
+import java.lang;
+
+interface ITest {
+	CharSequence getLabel ();
+	void setLabel (in CharSequence label);
+}
+
+####
+
+// This file is automatically generated and not supposed to be modified.
+using System;
+using Boolean = System.Boolean;
+using String = System.String;
+using List = Android.Runtime.JavaList;
+using Map = Android.Runtime.JavaDictionary;
+using Java;
+
+namespace Com.Xamarin.Test
+{
+	public interface ITest : global::Android.OS.IInterface
+	{
+		Java.Lang.ICharSequence GetLabel ();
+		void SetLabel (Java.Lang.ICharSequence label);
+	}
+
+	public abstract class ITestStub : global::Android.OS.Binder, global::Android.OS.IInterface, Com.Xamarin.Test.ITest
+	{
+		const string descriptor = "com.xamarin.test.ITest";
+		public ITestStub ()
+		{
+			this.AttachInterface (this, descriptor);
+		}
+
+		public static Com.Xamarin.Test.ITest AsInterface (global::Android.OS.IBinder obj)
+		{
+			if (obj == null)
+				return null;
+			var iin = (global::Android.OS.IInterface) obj.QueryLocalInterface (descriptor);
+			if (iin != null && iin is Com.Xamarin.Test.ITest)
+				return (Com.Xamarin.Test.ITest) iin;
+			return new Proxy (obj);
+		}
+
+		public global::Android.OS.IBinder AsBinder ()
+		{
+			return this;
+		}
+
+		protected override bool OnTransact (int code, global::Android.OS.Parcel data, global::Android.OS.Parcel reply, int flags)
+		{
+			switch (code) {
+			case global::Android.OS.BinderConsts.InterfaceTransaction:
+				reply.WriteString (descriptor);
+				return true;
+
+			case TransactionGetLabel: {
+				data.EnforceInterface (descriptor);
+				var result = this.GetLabel ();
+				reply.WriteNoException ();
+				if (result != null) { reply.WriteInt (1); global::Android.Text.TextUtils.WriteToParcel (result, reply, global::Android.OS.ParcelableWriteFlags.ReturnValue); } else reply.WriteInt (0);
+				return true;
+				}
+
+			case TransactionSetLabel: {
+				data.EnforceInterface (descriptor);
+				Java.Lang.ICharSequence arg0 = default (Java.Lang.ICharSequence);
+				arg0 = data.ReadInt () != 0 ? (global::Java.Lang.ICharSequence) global::Android.Text.TextUtils.CharSequenceCreator.CreateFromParcel (data) : null;
+				this.SetLabel (arg0);
+				reply.WriteNoException ();
+				return true;
+				}
+
+			}
+			return base.OnTransact (code, data, reply, flags);
+		}
+
+		public class Proxy : Java.Lang.Object, Com.Xamarin.Test.ITest
+		{
+			global::Android.OS.IBinder remote;
+
+			public Proxy (global::Android.OS.IBinder remote)
+			{
+				this.remote = remote;
+			}
+
+			public global::Android.OS.IBinder AsBinder ()
+			{
+				return remote;
+			}
+
+			public string GetInterfaceDescriptor ()
+			{
+				return descriptor;
+			}
+
+			public Java.Lang.ICharSequence GetLabel ()
+			{
+				global::Android.OS.Parcel __data = global::Android.OS.Parcel.Obtain ();
+
+				global::Android.OS.Parcel __reply = global::Android.OS.Parcel.Obtain ();
+				Java.Lang.ICharSequence __result = default (Java.Lang.ICharSequence);
+
+				try {
+					__data.WriteInterfaceToken (descriptor);
+					remote.Transact (ITestStub.TransactionGetLabel, __data, __reply, 0);
+					__reply.ReadException ();
+					__result = __reply.ReadInt () != 0 ? (global::Java.Lang.ICharSequence) global::Android.Text.TextUtils.CharSequenceCreator.CreateFromParcel (__reply) : null;
+
+				} finally {
+					__reply.Recycle ();
+					__data.Recycle ();
+				}
+				return __result;
+
+			}
+
+
+			public void SetLabel (Java.Lang.ICharSequence label)
+			{
+				global::Android.OS.Parcel __data = global::Android.OS.Parcel.Obtain ();
+
+				global::Android.OS.Parcel __reply = global::Android.OS.Parcel.Obtain ();
+
+				try {
+					__data.WriteInterfaceToken (descriptor);
+					if (label != null) { __data.WriteInt (1); global::Android.Text.TextUtils.WriteToParcel (label, __data, global::Android.OS.ParcelableWriteFlags.None); } else __data.WriteInt (0);
+					remote.Transact (ITestStub.TransactionSetLabel, __data, __reply, 0);
+					__reply.ReadException ();
+
+				} finally {
+					__data.Recycle ();
+				}
+
+			}
+
+
+		}
+
+		internal const int TransactionGetLabel = global::Android.OS.Binder.InterfaceConsts.FirstCallTransaction + 0;
+
+		internal const int TransactionSetLabel = global::Android.OS.Binder.InterfaceConsts.FirstCallTransaction + 1;
+
+		public abstract Java.Lang.ICharSequence GetLabel ();
+
+		public abstract void SetLabel (Java.Lang.ICharSequence label);
+
+	}
+}
+
@@ -0,0 +1,151 @@
+package com.xamarin.test;
+
+import android.os;
+
+interface ITest {
+	IBinder getBinder ();
+	void setBinder (in IBinder binder);
+}
+
+####
+
+// This file is automatically generated and not supposed to be modified.
+using System;
+using Boolean = System.Boolean;
+using String = System.String;
+using List = Android.Runtime.JavaList;
+using Map = Android.Runtime.JavaDictionary;
+using Android;
+
+namespace Com.Xamarin.Test
+{
+	public interface ITest : global::Android.OS.IInterface
+	{
+		Android.OS.IBinder GetBinder ();
+		void SetBinder (Android.OS.IBinder binder);
+	}
+
+	public abstract class ITestStub : global::Android.OS.Binder, global::Android.OS.IInterface, Com.Xamarin.Test.ITest
+	{
+		const string descriptor = "com.xamarin.test.ITest";
+		public ITestStub ()
+		{
+			this.AttachInterface (this, descriptor);
+		}
+
+		public static Com.Xamarin.Test.ITest AsInterface (global::Android.OS.IBinder obj)
+		{
+			if (obj == null)
+				return null;
+			var iin = (global::Android.OS.IInterface) obj.QueryLocalInterface (descriptor);
+			if (iin != null && iin is Com.Xamarin.Test.ITest)
+				return (Com.Xamarin.Test.ITest) iin;
+			return new Proxy (obj);
+		}
+
+		public global::Android.OS.IBinder AsBinder ()
+		{
+			return this;
+		}
+
+		protected override bool OnTransact (int code, global::Android.OS.Parcel data, global::Android.OS.Parcel reply, int flags)
+		{
+			switch (code) {
+			case global::Android.OS.BinderConsts.InterfaceTransaction:
+				reply.WriteString (descriptor);
+				return true;
+
+			case TransactionGetBinder: {
+				data.EnforceInterface (descriptor);
+				var result = this.GetBinder ();
+				reply.WriteNoException ();
+				reply.WriteStrongBinder (result);
+				return true;
+				}
+
+			case TransactionSetBinder: {
+				data.EnforceInterface (descriptor);
+				Android.OS.IBinder arg0 = default (Android.OS.IBinder);
+				arg0 = data.ReadStrongBinder ();
+				this.SetBinder (arg0);
+				reply.WriteNoException ();
+				return true;
+				}
+
+			}
+			return base.OnTransact (code, data, reply, flags);
+		}
+
+		public class Proxy : Java.Lang.Object, Com.Xamarin.Test.ITest
+		{
+			global::Android.OS.IBinder remote;
+
+			public Proxy (global::Android.OS.IBinder remote)
+			{
+				this.remote = remote;
+			}
+
+			public global::Android.OS.IBinder AsBinder ()
+			{
+				return remote;
+			}
+
+			public string GetInterfaceDescriptor ()
+			{
+				return descriptor;
+			}
+
+			public Android.OS.IBinder GetBinder ()
+			{
+				global::Android.OS.Parcel __data = global::Android.OS.Parcel.Obtain ();
+
+				global::Android.OS.Parcel __reply = global::Android.OS.Parcel.Obtain ();
+				Android.OS.IBinder __result = default (Android.OS.IBinder);
+
+				try {
+					__data.WriteInterfaceToken (descriptor);
+					remote.Transact (ITestStub.TransactionGetBinder, __data, __reply, 0);
+					__reply.ReadException ();
+					__result = __reply.ReadStrongBinder ();
+
+				} finally {
+					__reply.Recycle ();
+					__data.Recycle ();
+				}
+				return __result;
+
+			}
+
+
+			public void SetBinder (Android.OS.IBinder binder)
+			{
+				global::Android.OS.Parcel __data = global::Android.OS.Parcel.Obtain ();
+
+				global::Android.OS.Parcel __reply = global::Android.OS.Parcel.Obtain ();
+
+				try {
+					__data.WriteInterfaceToken (descriptor);
+					__data.WriteStrongBinder (binder);
+					remote.Transact (ITestStub.TransactionSetBinder, __data, __reply, 0);
+					__reply.ReadException ();
+
+				} finally {
+					__data.Recycle ();
+				}
+
+			}
+
+
+		}
+
+		internal const int TransactionGetBinder = global::Android.OS.Binder.InterfaceConsts.FirstCallTransaction + 0;
+
+		internal const int TransactionSetBinder = global::Android.OS.Binder.InterfaceConsts.FirstCallTransaction + 1;
+
+		public abstract Android.OS.IBinder GetBinder ();
+
+		public abstract void SetBinder (Android.OS.IBinder binder);
+
+	}
+}
+