[TrimmableTypeMap] Add CoreCLRTrimmable Mono.Android.NET-Tests lane by simonrozsival · Pull Request #11091 · dotnet/android

simonrozsival · 2026-04-08T19:06:57Z

Summary

Add the CoreCLRTrimmable Mono.Android.NET-Tests CI lane and fix the Release regressions exposed by the trimmable typemap path.

This PR includes

[TrimmableTypeMap] Fix bugs exposed by Release+CoreCLR+trimmable test run

Generator fixes:

Use (managedName, assemblyName) tuple as scanner dictionary key — prevents duplicate-type crashes when two assemblies define the same managed name (e.g. Java.Lang.Throwable in both Java.Interop and Mono.Android)
Add MergeCrossAssemblyAliases to propagate aliases across assembly boundaries before splitting into per-assembly typemap universes (Release only)
Emit TypeMapAssociationAttribute for all entries with proxies so the runtime proxy type map is populated correctly (fixes CreatePeer for interface types)
ForceUnconditionalEntries=true workaround for dotnet/runtime#127004 — trimmer strips TypeMapAssociation attributes when TypeMap references the same type
Fix invalid ParameterHandle (was default/row-0); use valid 1-based row index

Runtime fixes:

Add JavaPeerProxy.ShouldSkipActivation(IntPtr) to detect existing managed peers and prevent duplicate peer creation during UCO constructor callbacks

Build fixes:

Add _PrepareTrimmableNativeConfigAssemblies target to populate native config unconditionally (not inside _GenerateJavaStubs which can be skipped)
Add typemap DLLs to _ShrunkAssemblies to keep _RemoveRegisterAttribute counts in sync
Skip _GenerateTrimmableTypeMap in inner per-RID builds

[tests] Add CoreCLRTrimmable test plumbing

Root test and runner assemblies via TrimmerRoots.xml
Exclude 48 tests incompatible with the trimmable typemap (tracked in [TrimmableTypeMap] Trimmable typemap test exclusions inventory #11170), guarded by RuntimeFeature.TrimmableTypeMap
Add TODO comments to tests with known trimmable-specific failures

[CI] Add CoreCLRTrimmable lane

Runs Mono.Android.NET-Tests with _AndroidTypeMapImplementation=trimmable and UseMonoRuntime=false

Excluded tests (48)

All 48 excluded tests are precisely named in NUnitInstrumentation.cs — no over-broad prefix matching. They are excluded only for trimmable builds (guarded by RuntimeFeature.TrimmableTypeMap). See #11170 for full inventory with root causes.

Root Cause	Count
`JavaProxyObject`/`JavaProxyThrowable` not in APK	24
Missing `net.dot.jni.test.` / `net.dot.jni.internal.` Java classes	5
Proxy resolution / trimmer gaps	4
JavaCast proxy resolution	4
Open generic types / registration	4
JNI method remapping not supported	4
Other	3

Validation

Local Release + CoreCLR + trimmable run:

859 passed ✅
48 excluded (known trimmable-incompatible, tracked in [TrimmableTypeMap] Trimmable typemap test exclusions inventory #11170)
10 ignored (by NativeTypeMap, Export, and other non-trimmable categories)
917 total

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot

Pull request overview

Adds CI/test-lane plumbing to run Mono.Android.NET-Tests on CoreCLR with the trimmable typemap implementation, keeping currently-unsupported test buckets explicitly excluded to maintain green coverage while follow-up runtime/generator work lands separately.

Changes:

Adds a new CoreCLRTrimmable APK instrumentation lane and pins the existing CoreCLR lane to llvm-ir.
Updates Mono.Android.NET-Tests.csproj to default to CoreCLR + exclude trimmable-specific buckets when _AndroidTypeMapImplementation=trimmable.
Centralizes additional trimmable-mode runtime test exclusions in NUnitInstrumentation, and adjusts a few Java.Interop tests/projects to avoid unsupported coverage.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/Mono.Android-Tests/Mono.Android-Tests/Xamarin.Android.RuntimeTests/NUnitInstrumentation.cs	Adds runtime-switch-driven exclusions for categories and specific Java.Interop test names under trimmable typemap.
tests/Mono.Android-Tests/Mono.Android-Tests/Mono.Android.NET-Tests.csproj	Sets defaults/exclusions for trimmable typemap runs (incl. CoreCLRTrimmable flavor).
tests/Mono.Android-Tests/Mono.Android-Tests/Java.Interop/JnienvTest.cs	Marks specific tests as `TrimmableIgnore`.
tests/Mono.Android-Tests/Mono.Android-Tests/Java.Interop/JavaObjectExtensionsTests.cs	Marks a specific test as `TrimmableIgnore` (and normalizes file header).
tests/Mono.Android-Tests/Java.Interop-Tests/Java.Interop-Tests.NET.csproj	Removes `JniTypeUtf8Test.cs` from compilation due to unsupported APIs in the product assembly.
build-tools/automation/yaml-templates/stage-package-tests.yaml	Updates CoreCLR lane args and adds the new CoreCLRTrimmable lane.

simonrozsival

🤖 AI Review Summary

Verdict: ✅ LGTM

Found 1 suggestion:

💡 Code organization — the trimmable category filtering is now split between Mono.Android.NET-Tests.csproj and NUnitInstrumentation.cs (NUnitInstrumentation.cs:29). Keeping one source of truth would make the temporary exclusions easier to retire.

The lane wiring itself looks good, and I like that the unsupported cases stay explicit instead of being hidden behind runtime fallback behavior.

Review generated by android-reviewer from review guidelines.

simonrozsival · 2026-04-17T10:23:08Z

Splitting this PR into focused, reviewable pieces so each fix gets the attention it deserves. This PR will stay open and become a thin, clean addition to CI configuration once all the children land on main.

Child PRs

#	Scope	Status
#11142	Package CoreCLR preserve list in SDK pack (+`<None>` with `Link` + test asserting the file is actually packaged)	merged
#11144	Fix IL1034 by excluding the app assembly from trimmer roots (Option A — preserves the whole point of the trimmable typemap by not rooting everything)	merged
#11143	Manifest generator fixes: default instrumentation `targetPackage`, stale-manifest sentinel on mode switch, outer `IntermediateOutputPath`, CRC name rewriting in manifest template	merged
#11145	Runtime and typemap generator fixes: init ordering, generic type proxy loading, `ClassLoader` mismatch in `RegisterNatives`, abstract Instrumentation/Application subtypes, proxy self-application as `[JavaPeerProxy]` + regression test	merged

Once the children merge, this PR will be rebased to include only:

The new CoreCLRTrimmable CI lane + TestEnvironment plumbing.
Test-side adjustments and CoreCLRTrimmable-specific skips for failing JavaCast/JavaAs/JavaObjectArray tests.

Follow-ups (issues)

Unify the native-method registration approach: always defer via __md_registerNatives () for all types, remove the CannotRegisterInStaticConstructor flag and its propagation helpers, and revisit static { registerNatives } as a later optimization for provably safe types. ([TrimmableTypeMap] Runtime and typemap generator fixes #11145 notes the known gap this creates for concrete descendants of abstract Application/Instrumentation.)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Keep the trimmable typemap PR focused on the CoreCLRTrimmable lane and its targeted test-side plumbing. Move the generic NUnit runner and logcat auditing work to PR #11162, and drop the leftover Preserve-related noise. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

simonrozsival

⚠️ Needs Changes

Nice split between the trimmable typemap/product work here and the generic harness changes in #11162 — that makes this PR much easier to reason about. I left one inline suggestion on the new regression tests.

CI note: the public checks look good, but the internal Xamarin.Android-PR pipeline is still pending, so this is not merge-ready quite yet.

## Summary Improve the Android NUnit harness so trimmable and test-lane investigations can audit discovery and exclusions reliably. ## Changes - fix final Passed/Failed/Skipped summary counts to match NUnit aggregate results - add a discovery-only dry-run mode - add noexclusions=true to bypass built-in exclusions for auditing - surface excluded tests as ignored results with explicit reasons - overwrite logcat output per run so stale logs do not masquerade as current crashes ## Why These generic test-runner improvements were useful while working on #11091. I had problems identifying which tests were discovered, but did not run, as passed + skipped + failed < total. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Co-authored-by: Jonathan Peppers <jonathan.peppers@microsoft.com>

simonrozsival · 2026-04-20T22:44:00Z

failing tests are unrelated

simonrozsival · 2026-04-20T22:44:28Z

/review

github-actions · 2026-04-20T22:44:53Z

✅ Android PR Reviewer completed successfully!

github-actions

✅ LGTM — well-structured change

Summary: Adds the CoreCLRTrimmable Mono.Android.NET-Tests CI lane and fixes several trimmable typemap issues exposed by running Release + CoreCLR + trimmable builds. Clean and well-organized PR.

What works well

PropagateCannotRegisterToDescendants — correct bidirectional propagation (up to base classes, then down to descendants) ensures the complete transitive closure. Algorithm is simple and appropriate for the small number of types involved.
CollectApplicationRegistrationTypes — smart filtering that keeps only the two framework roots plus app/runtime types, avoiding legacy android.test.* descendants that don't exist on modern API surfaces. Well-tested.
AdditionalResolvedAssemblies on GenerateNativeApplicationConfigSources — clean separation of counting (for native config) from assembly store inclusion (handled by _AddTrimmableTypeMapAssembliesToStore). Fixes the incremental build issue where the old approach inside _GenerateJavaStubs could be skipped.
Test coverage — new unit tests, build-level regression tests for assembly store mappings, and incremental build verification.
TrimmerRoots.xml — targeted preservation of only the types needed by the test suite via reflection.

Issues found

Severity	Count
💡 Suggestion	5

No bugs or correctness issues found. All suggestions are minor formatting/style items.

CI Status

Public checks (license/cla, dotnet-android) are ✅ passing. Internal Azure DevOps build status should be verified separately.

Generated by Android PR Reviewer for issue #11091 · ● 9.1M

github-actions · 2026-04-20T22:51:17Z

+    skipped on incremental builds, which would leave the item group empty.
+  -->
+  <Target Name="_PrepareTrimmableNativeConfigAssemblies"
+      BeforeTargets="_GeneratePackageManagerJava">


🤖 💡 MSBuild targets — _PrepareTrimmableNativeConfigAssemblies uses BeforeTargets="_GeneratePackageManagerJava", but $(_GeneratePackageManagerJavaDependsOn) exists and is the preferred extension point. Since this file is imported after Common.targets, you could append to the property:

<PropertyGroup> <_GeneratePackageManagerJavaDependsOn> _PrepareTrimmableNativeConfigAssemblies; $(_GeneratePackageManagerJavaDependsOn) </_GeneratePackageManagerJavaDependsOn> </PropertyGroup>

That said, BeforeTargets is simpler here and the comment explains the rationale well, so this is a "consider" not a "must fix."

Rule: Avoid BeforeTargets/AfterTargets (Postmortem #33)

github-actions · 2026-04-20T22:51:17Z

+				}
+
+				var environmentText = File.ReadAllText (environmentFile);
+				var runtimeDataMatch = Regex.Match (environmentText, @"assembly_store_bundled_assemblies.*\[(\d+)\s+x");


🤖 💡 Performance — The two Regex patterns inside the foreach loop are recompiled on every iteration. For a test this isn't critical, but consider extracting them to static readonly Regex fields (or using [GeneratedRegex]) for cleanliness:

static readonly Regex AssemblyStoreCountRegex = new (@"assembly_store_bundled_assemblies.*\[(\d+)\s+x", RegexOptions.Compiled); static readonly Regex MappingIndexRegex = new (@"\bmi:(\d+)\b", RegexOptions.Compiled);

Rule: Avoid unnecessary allocations

simonrozsival · 2026-04-20T22:56:39Z

@copilot implement the suggestions in review comments

Copilot · 2026-04-20T23:32:34Z

@copilot implement the suggestions in review comments

Implemented in 36b783e. Tests in our project that are trimmable-incompatible now use [Category("TrimmableIgnore")] (5 SSL cert callback tests in AndroidMessageHandlerTests.cs, 5 JavaCast/JavaAs tests in JavaObjectExtensionsTests.cs, and 2 typemap tests in JnienvTest.cs). The TrimmableIgnore category is excluded via ExcludeCategories in the csproj. NUnitInstrumentation.cs now only lists the 10 tests from the external Java.Interop-Tests assembly that we can't categorize without modifying the upstream submodule, with a comment explaining why.

🤖 AI Review Summary

Verdict: ✅ LGTM...

Addressed in 36b783e — tests in this project that are trimmable-incompatible now carry [Category("TrimmableIgnore")] and are excluded via ExcludeCategories in the csproj. Only the external Java.Interop-Tests fixtures (from the upstream submodule we don't control) remain listed by name in NUnitInstrumentation.cs.

… run Fix several trimmable typemap generator and runtime bugs that prevented Mono.Android.NET-Tests from passing in Release+CoreCLR+trimmable mode: Generator: - Use (managedName, assemblyName) tuple as scanner dictionary key to prevent duplicate-type crashes when two assemblies define the same managed type name (e.g. Java.Lang.Throwable in both Java.Interop and Mono.Android) - Add MergeCrossAssemblyAliases to propagate aliases across assembly boundaries before splitting peers into per-assembly typemap universes (Release only) - Emit TypeMapAssociationAttribute for all entries with proxies so the runtime proxy type map is populated correctly (fixes CreatePeer for interface types) - ForceUnconditionalEntries=true workaround for dotnet/runtime#127004 (trimmer strips TypeMapAssociation attributes when TypeMap references the same type) - Fix invalid ParameterHandle (was default/row-0); use valid 1-based row index - Skip inner per-RID builds in _GenerateTrimmableTypeMap (they lack the full assembly set needed for correct deferred-registration propagation) Runtime: - Add JavaPeerProxy.ShouldSkipActivation(IntPtr) to detect existing managed peers and prevent duplicate peer creation during UCO constructor callbacks - Use ShouldSkipActivation in UCO nctor callbacks instead of WithinNewObjectScope Build: - Add _PrepareTrimmableNativeConfigAssemblies target to populate native config with typemap DLL paths (must run unconditionally, not inside _GenerateJavaStubs) - Add typemap DLLs to _ShrunkAssemblies to keep _RemoveRegisterAttribute counts in sync with _ResolvedAssemblies Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Configure Mono.Android.NET-Tests to build and run successfully with _AndroidTypeMapImplementation=trimmable and UseMonoRuntime=false. Changes: - Root test and runner assemblies in TrimmerRoots.xml so NUnit can discover and execute tests after trimming - Exclude 48 tests that are incompatible with the trimmable typemap (tracked in #11170): - 5 tests that require net.dot.jni.test.*/net.dot.jni.internal.* Java classes - 24 tests relying on JavaProxyObject/JavaProxyThrowable (not in APK) - 4 proxy resolution / trimmer gaps - 4 JavaCast proxy resolution failures - 4 open generic type / registration failures - 4 JNI method remapping not supported - 3 other - Exclusions are guarded by RuntimeFeature.TrimmableTypeMap so they only apply to trimmable builds - Add TODO comments to tests with known trimmable-specific failures (issue #11170) so they are visible to contributors Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Add a new CI lane that runs Mono.Android.NET-Tests with the trimmable typemap implementation on CoreCLR: _AndroidTypeMapImplementation=trimmable UseMonoRuntime=false The lane runs after the existing CoreCLR lane and uses the same APK artifact from the CoreCLRTrimmable build flavor. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

In non-trimmed (Debug) builds, _AndroidEnableObjectReferenceLogging defaults to true, so RuntimeFeature.ObjectReferenceLogging returns true. The existing Meter test already uses the same #if DEBUG pattern; apply it here too. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

The feature switch (ObjectReferenceLoggingEnabledByDefault) is the source of truth; its default value varies by build configuration (true in non-trimmed Debug builds, false in trimmed Release builds). Hardcoding an expected value in the test is fragile. Remove the test case entirely. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

simonrozsival mentioned this pull request Apr 8, 2026

Enable trimmable typemap for Mono.Android.NET-Tests #11087

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simonrozsival force-pushed the dev/simonrozsival/trimmable-test-plumbing branch from f8106b0 to a437455 Compare April 9, 2026 09:19

simonrozsival added trimmable-type-map copilot `copilot-cli` or other AIs were used to author this labels Apr 9, 2026

simonrozsival force-pushed the dev/simonrozsival/trimmable-runtime-fixes branch from d5aefaa to 3a8d509 Compare April 10, 2026 09:49

simonrozsival mentioned this pull request Apr 10, 2026

[TrimmableTypeMap] Runtime-only trimmable typemap support #11090

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Base automatically changed from dev/simonrozsival/trimmable-runtime-fixes to main April 10, 2026 22:50

simonrozsival force-pushed the dev/simonrozsival/trimmable-test-plumbing branch 2 times, most recently from 1814a6d to d0e30f6 Compare April 11, 2026 09:42

simonrozsival changed the title ~~[TrimmableTypeMap] Test plumbing and CI lane for Mono.Android.NET-Tests~~ [TrimmableTypeMap] Stabilize CoreCLR Mono.Android.NET-Tests lane Apr 11, 2026

simonrozsival force-pushed the dev/simonrozsival/trimmable-test-plumbing branch from 17b123b to e2c70fd Compare April 11, 2026 23:28

simonrozsival changed the base branch from main to dev/simonrozsival/root-manifest-referenced-types April 11, 2026 23:28

simonrozsival added a commit that referenced this pull request Apr 11, 2026

[TrimmableTypeMap] Keep #11091 to explicit skips

87c531f

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

simonrozsival force-pushed the dev/simonrozsival/trimmable-test-plumbing branch from e2c70fd to 87c531f Compare April 11, 2026 23:50

simonrozsival changed the title ~~[TrimmableTypeMap] Stabilize CoreCLR Mono.Android.NET-Tests lane~~ [TrimmableTypeMap] Add CoreCLR Mono.Android.NET-Tests lane plumbing Apr 11, 2026

simonrozsival marked this pull request as ready for review April 12, 2026 08:01

simonrozsival requested a review from jonathanpeppers as a code owner April 12, 2026 08:01

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Base automatically changed from dev/simonrozsival/fix-deferred-registration-propagation to main April 14, 2026 14:19

simonrozsival force-pushed the dev/simonrozsival/trimmable-test-plumbing branch from 19ec2fa to e084238 Compare April 14, 2026 14:32

simonrozsival changed the title ~~[TrimmableTypeMap] Add CoreCLR Mono.Android.NET-Tests lane plumbing~~ [TrimmableTypeMap] Add CoreCLRTrimmable Mono.Android.NET-Tests lane plumbing Apr 14, 2026

This was referenced Apr 17, 2026

Add Copilot skill: diagnosing dotnet/android across C# / Java / C++ / generated native #11139

Open

Add generator output unit tests for trimmable typemap (attribute-shape verification) #11140

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simonrozsival force-pushed the dev/simonrozsival/trimmable-test-plumbing branch from e02ec3c to 4abdc1e Compare April 17, 2026 09:21

This was referenced Apr 17, 2026

Add investigation & debugging practices to copilot-instructions #11141

Merged

[TrimmableTypeMap] Package CoreCLR preserve list in SDK pack #11142

Merged

[TrimmableTypeMap] Manifest generator fixes #11143

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simonrozsival marked this pull request as draft April 17, 2026 10:35

simonrozsival added a commit that referenced this pull request Apr 18, 2026

[TrimmableTypeMap] Keep #11091 to explicit skips

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Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

simonrozsival mentioned this pull request Apr 20, 2026

[tests] Improve NUnit runner reporting and dry-run auditing #11162

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simonrozsival marked this pull request as ready for review April 20, 2026 10:46

simonrozsival commented Apr 20, 2026

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sbomer mentioned this pull request Apr 22, 2026

[NativeAOT] Add trimmable type map build tests and decouple ILC from ILLink #11183

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simonrozsival mentioned this pull request Apr 24, 2026

[TrimmableTypeMap] Trimmable typemap test exclusions inventory #11170

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simonrozsival force-pushed the dev/simonrozsival/trimmable-test-plumbing branch from fd05865 to 2d750b0 Compare April 24, 2026 17:11

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Excluded tests (48)

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✅ LGTM — well-structured change

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