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[coreclr] Initial support of R2R builds #10007

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Merged
merged 4 commits into from
Apr 21, 2025
Merged

[coreclr] Initial support of R2R builds #10007

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9a3e300
Enable R2R builds
ivanpovazan Apr 4, 2025
772de8e
Add R2R build tests
ivanpovazan Apr 7, 2025
de98b73
Update src/Xamarin.Android.Build.Tasks/Tests/Xamarin.Android.Build.Te…
ivanpovazan Apr 16, 2025
619186b
Use better verification method that app assembly in the apk has R2R i…
ivanpovazan Apr 17, 2025
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15 changes: 15 additions & 0 deletions src/Xamarin.Android.Build.Tasks/Tests/Xamarin.Android.Build.Tests/BuildTest2.cs
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Expand Up @@ -156,12 +156,27 @@ public void BasicApplicationPublishReadyToRun (bool isComposite, string rid)
proj.SetProperty ("UseMonoRuntime", "false"); // Enables CoreCLR
proj.SetProperty ("_IsPublishing", "true"); // Make "dotnet build" act as "dotnet publish"
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Can you update this line for when $(PublishReadyToRun) is true:

android/src/Xamarin.Android.Build.Tasks/Microsoft.Android.Sdk/targets/Microsoft.Android.Sdk.DefaultProperties.targets

Line 34 in 747041d

<_IsPublishing Condition=" '$(_IsPublishing)' == '' and '$(_AndroidRuntime)' == 'NativeAOT' ">true</_IsPublishing>

I would expect dotnet build -c Release -p:PublishReadyToRun=true to work by default on Android.

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We could make this as a temporary workaround for R2R as well.
However, on the long run we shouldn't force dotnet build -c Release -p:PublishReadyToRun=true to do publishing as that would not match the behavior on other platforms.
On desktop and on iOS, triggering NativeAOT builds only happens with dotnet publish , dotnet build uses "regular" default runtimes/builds -> CoreCLR desktop, Mono iOS

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Just for reference, MAUI on Windows uses PublishReadyToRun=true by default on Release builds since .NET 7:

If R2R is what makes the startup performance reasonable, I think we have to use it by default on Android as well? So, dotnet build -c Release on Android would use R2R?

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That only applies if you are publishing your app through Visual Studio, or manually through dotnet publish.
dotnet build will not / should not run publish targets when PublishReadyToRun=true.

On a regular console app if you add PublishReadyToRun=true to the project and run dotnet build it will not run R2R AOT compiler. But if you run dotnet publish it will.

So to come back to my previous comment, we should not force _IsPublishing=true for NativeAOT nor R2R just so we would make
dotnet build -p:PublishAOT=true or
dotnet build -p:PublishReadyToRun=true to run/act like dotnet publish, it is against the behavior we have on other platforms (e.g., on macios we solved it with yet another property: https://github.com/dotnet/macios/blob/7cef45367161ca26d3a68e2e096639194ed4df1f/dotnet/targets/Xamarin.Shared.Sdk.props#L39)

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The difference is people can actually ship their app with dotnet build -c Release for Android today (and they are). There is currently no requirement to use dotnet publish on Android.

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As per our offline discussion, we will address this in the follow-up work of fully enabling R2R builds

proj.SetProperty ("PublishReadyToRun", "true"); // Enable R2R
proj.SetProperty ("AndroidEnableAssemblyCompression", "false");

if (isComposite)
proj.SetProperty ("PublishReadyToRunComposite", "true"); // Enable R2R composite

var b = CreateApkBuilder ();
Assert.IsTrue (b.Build (proj), "Build should have succeeded.");

var assemblyName = proj.ProjectName;
var apk = Path.Combine (Root, b.ProjectDirectory, proj.OutputPath, rid, $"{proj.PackageName}-Signed.apk");
FileAssert.Exists (apk);

var helper = new ArchiveAssemblyHelper (apk, true);
var abi = MonoAndroidHelper.RidToAbi (rid);
Assert.IsTrue (helper.Exists ($"assemblies/{abi}/{assemblyName}.dll"), $"{assemblyName}.dll should exist in apk!");

using var stream = helper.ReadEntry ($"assemblies/{assemblyName}.dll");
stream.Position = 0;
using var peReader = new System.Reflection.PortableExecutable.PEReader (stream);
Assert.IsTrue (peReader.PEHeaders.CorHeader.ManagedNativeHeaderDirectory.Size > 0,
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@jonathanpeppers I used the recommendation from: dotnet/runtime#38440 (comment) to verify that the app main assembly that gets packed into the .apk has R2R image in it.

$"ReadyToRun image not found in {assemblyName}.dll! ManagedNativeHeaderDirectory should not be empty!");
}

[Test]
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