[Mono.Android.Export] decorate types to improve trimming warnings #9300
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The entire `Mono.Android.Export.dll` assembly is not trimming safe,
and never will be: it relies on many dynamic features. But it is
possible to get the warning:
warning IL2104: Assembly 'Mono.Android.Export' produced trim warnings. For more information see https://aka.ms/dotnet-illink/libraries
First, import `trim-analyzers.props` so we have the right analyzers
set for `Mono.Android.Export.csproj`. We can also remove
`$(EnableSingleFileAnalyzer)` as it is in `trim-analyzers.props`.
This results in ~41 errors, which are mostly resolved by decorating
every type with:
[RequiresUnreferencedCode (MonoAndroidExport.DynamicFeatures)]
This seems simpler than decorating methods, as there are quite a few
more methods involved than classes.
After this change, we are down to a handful of warnings:
Mono.Android.Export\CallbackCode.cs(526,19): error IL3050: Using member 'System.Reflection.Emit.AssemblyBuilder.DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess)' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. Defining a dynamic assembly requires dynamic code.
Mono.Android.Export\CallbackCode.cs(197,32): error IL3050: Using member 'System.Reflection.MethodInfo.MakeGenericMethod(params Type[])' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. The native code for this instantiation might not be available at runtime.
Mono.Android.Export\Mono.CodeGeneration\CodeCustomAttribute.cs(82,23): error IL3050: Using member 'System.Collections.ArrayList.ToArray(Type)' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. The code for an array of the specified type might not be available.
Mono.Android.Export\Mono.CodeGeneration\CodeCustomAttribute.cs(83,20): error IL3050: Using member 'System.Collections.ArrayList.ToArray(Type)' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. The code for an array of the specified type might not be available.
Mono.Android.Export\CallbackCode.cs(609,59): error IL3050: Using member 'System.Type.MakeGenericType(params Type[])' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. The native code for this instantiation might not be available at runtime.
Mono.Android.Export\CallbackCode.cs(612,22): error IL3050: Using member 'System.Type.MakeGenericType(params Type[])' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. The native code for this instantiation might not be available at runtime.
Mono.Android.Export\CallbackCode.cs(270,32): error IL3050: Using member 'System.Reflection.MethodInfo.MakeGenericMethod(params Type[])' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. The native code for this instantiation might not be available at runtime.
Mono.Android.Export\Mono.CodeGeneration\CodeModule.cs(48,35): error IL3050: Using member 'System.Reflection.Emit.AssemblyBuilder.DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess)' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. Defining a dynamic assembly requires dynamic code.
Mono.Android.Export\CallbackCode.cs(426,32): error IL3050: Using member 'System.Reflection.MethodInfo.MakeGenericMethod(params Type[])' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. The native code for this instantiation might not be available at runtime.
Mono.Android.Export\CallbackCode.cs(643,13): error IL3050: Using member 'System.Reflection.Emit.DynamicMethod.DynamicMethod(String, MethodAttributes, CallingConventions, Type, Type[], Module, Boolean)' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. Creating a DynamicMethod requires dynamic code.
Mono.Android.Export\CallbackCode.cs(336,32): error IL3050: Using member 'System.Reflection.MethodInfo.MakeGenericMethod(params Type[])' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. The native code for this instantiation might not be available at runtime.
Mono.Android.Export\CallbackCode.cs(336,154): error IL3050: Using member 'System.Type.MakeArrayType()' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. The code for an array of the specified type might not be available.
Mono.Android.Export\CallbackCode.cs(341,32): error IL3050: Using member 'System.Reflection.MethodInfo.MakeGenericMethod(params Type[])' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. The native code for this instantiation might not be available at runtime.
Mono.Android.Export\CallbackCode.cs(346,32): error IL3050: Using member 'System.Reflection.MethodInfo.MakeGenericMethod(params Type[])' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. The native code for this instantiation might not be available at runtime.
Mono.Android.Export\CallbackCode.cs(368,32): error IL3050: Using member 'System.Reflection.MethodInfo.MakeGenericMethod(params Type[])' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. The native code for this instantiation might not be available at runtime.
Mono.Android.Export\CallbackCode.cs(373,32): error IL3050: Using member 'System.Reflection.MethodInfo.MakeGenericMethod(params Type[])' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. The native code for this instantiation might not be available at runtime.
Mono.Android.Export\CallbackCode.cs(671,6): error IL3050: Using member 'System.Reflection.MethodInfo.MakeGenericMethod(params Type[])' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. The native code for this instantiation might not be available at runtime.
This is a *different* analyzer for NativeAOT, which is IL3050.
The types involved are a smaller list, I decorated each with:
[RequiresDynamicCode (MonoAndroidExport.DynamicFeatures)]
With these changes, there are no no warnings present any longer.
Other changes:
* Delete `CodeAdd.cs`, it only contains a comment
src/Xamarin.Android.NamingCustomAttributes/Java.Interop/ExportAttribute.cs(21,3):
warning IL2026: Java.Interop.ExportAttribute.ExportAttribute(String): Using member 'Java.Interop.DynamicCallbackCodeGenerator..cctor()' which has 'RequiresUnreferencedCodeAttribute' can break functionality when trimming application code. Mono.Android.Export uses dynamic features.
jonathanpeppers
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to jonathanpeppers/maui
that referenced
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Sep 12, 2024
Context: dotnet#23769 Context: dotnet/android#9300 026e046 introduced `HybridWebView`, which unfortunately introduces trimmer warnings in the `dotnet new maui` project template: > dotnet new maui > dotnet build -f net9.0-android -c Release -p:TrimMode=Full ... hellomaui succeeded with 1 warning(s) (7.9s) /_/src/Core/src/Handlers/HybridWebView/HybridWebViewHandler.Android.cs(53,5): Trim analysis warning IL2026: Microsoft.Maui.Handlers.HybridWebViewHandler.HybridWebViewJavaScriptInterface.SendMessage(String): Using member 'Java.Interop.ExportAttribute.ExportAttribute(String)' which has 'RequiresUnreferencedCodeAttribute' can break functionality when trimming application code. [ExportAttribute] uses dynamic features. This is due to usage of `Java.Interop.ExportAttribute`: private sealed class HybridWebViewJavaScriptInterface : Java.Lang.Object { //... [JavascriptInterface] [Export("sendMessage")] public void SendMessage(string message) `Java.Interop.ExportAttribute` makes heavy usage of unbounded System.Reflection, System.Reflection.Emit, etc. for it to be able to work. It brings in an additional assembly `Mono.Android.Export.dll` as well. It is inherently trimming unsafe, but how did it get through these tests? https://github.com/dotnet/maui/blob/08ff1246383ed4fdaef84a40d5b2ae8e6096bb56/src/TestUtils/src/Microsoft.Maui.IntegrationTests/AndroidTemplateTests.cs#L50-L61 This slipped through, unfortunately, as we had missed solving all the trimmer warnings in `Mono.Android.Export.dll`! dotnet/android#9300 aims to fix that. After dotnet/android#9300, new trimming warnings specific to .NET MAUI will surface such as the one above. But we can easily replace `[Export]` by: * Define a Java interface & create a binding for it in C#, we already have `maui.aar` setup for this. * We can simply implement the interface in C# and remove `[Export]`. Lastly, I fixed some of the defaults in `Metadata.xml`, it didn't look like we were automatically making Java interfaces `internal`. It looks like we probably made `ImageLoaderCallback` public by mistake.
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Ok wow Until we get this one: |
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The entire
Mono.Android.Export.dllassembly is not trimming safe, and never will be: it relies on many dynamic features. But it is possible to get the warning:First, import
trim-analyzers.propsso we have the right analyzers set forMono.Android.Export.csproj. We can also remove$(EnableSingleFileAnalyzer)as it is intrim-analyzers.props.This results in ~41 errors, which are mostly resolved by decorating every type with:
This seems simpler than decorating methods, as there are quite a few more methods involved than classes.
After this change, we are down to a handful of warnings:
This is a different analyzer for NativeAOT, which is IL3050.
The types involved are a smaller list, I decorated each with:
With these changes, there are no no warnings present any longer.
Other changes:
CodeAdd.cs, it only contains a comment