[TrimmableTypeMap] Build pipeline: targets, scanner, task, assembly store by simonrozsival · Pull Request #10980 · dotnet/android

simonrozsival · 2026-03-20T12:12:39Z

Summary

Build pipeline for the trimmable typemap. Wires up manifest generation, assembly store,
and JCW generation. HelloWorld app runs end-to-end on device with button Click events.

Closes #10807.
Closes #10800.

Depends on #10991 (ManifestGenerator), #10967 (runtime).

Scanner extensions (`AssemblyIndex.cs`, `JavaPeerInfo.cs`, `JavaPeerScanner.cs`)

ComponentInfo, IntentFilterInfo, MetaDataInfo data model for type-level component attributes
AssemblyManifestInfo with ScanAssemblyAttributes() for assembly-level attrs
HasPublicParameterlessCtor via SRM method signature inspection (XA4213)
ScanAssemblyManifestInfo() returns assembly-level data alongside peer list

`GenerateTrimmableTypeMap` task

Manifest generation via ManifestGenerator (from [TrimmableTypeMap] Add ManifestGenerator #10991)
XA4213 validation, duplicate Application detection
JCW generation for user assemblies + framework mono/ Implementors (e.g. View_OnClickListenerImplementor). Framework binding types exist in java_runtime.dex; Implementor types need fresh generation because mono.android.jar uses legacy TypeManager.Activate() which is incompatible with Runtime.registerNatives(). Pre-generating SDK-compatible JCWs tracked by [TrimmableTypeMap] Pre-generating code for Mono.Android and other SDK assemblies #10792.

JCW generation fixes

JniNameToJavaName: converts $ → . for inner class references in Java source (javac requires ., not $)
GetNativeCallbackName: splits [Register] Connector string on : before checking Get…Handler pattern
ParseConnectorDeclaringType: extracts the Invoker type from the Connector so UCO wrappers resolve callbacks on the correct type

Trimmer size regression prevention

Set TrimmableTypeMap=false via RuntimeHostConfigurationOption in MonoVM.targets and NativeAOT.targets so ILLink can eliminate trimmable typemap code paths
Add ILLink substitutions for IsMonoRuntime and IsCoreClrRuntime
TrimmableTypeMap uses private ctor + Initialize() + singleton pattern — no type references leak outside feature guards
TrimmableTypeMapTypeManager uses TrimmableTypeMap.Instance singleton (no constructor parameter)
_RemoveRegisterAttribute: empty target — [Register] attributes needed at runtime for TryGetJniNameForType

MSBuild targets

`Trimmable.targets`

_GenerateTrimmableTypeMap: AfterTargets="CoreCompile" with Inputs/Outputs for incremental builds
_GenerateJavaStubs: assembly store wiring, TypeMap DLLs to _ResolvedAssemblies
Path normalization for macOS (Replace('\','/'))

`Trimmable.CoreCLR.targets`

ILLink integration: ManagedAssemblyToLink, --typemap-entry-assembly
_AddTrimmableTypeMapAssembliesToStore: per-ABI batched, linked/ to typemap/ fallback

Tests

296/296 unit tests pass
HelloWorld verified on emulator: Activity, layout XML, FindViewById<Button>, Click events
PublishTrimmed=true (ILLink inner build) verified: builds and runs successfully
BuildReleaseArm64SimpleDotNet.MonoVM apkdesc baseline updated

Other

File	Purpose
`GenerateEmptyTypemapStub.cs`	LLVM IR stub symbols (uses `Files.CopyIfStringChanged`)
`GenerateNativeApplicationConfigSources.cs`	Token=0 fallback gated behind `TargetsCLR`
`Trimmable.CoreCLR.xml`	Preserves `JNIEnvInit.Initialize`
`TypeMapAssemblyEmitter.cs`	Self-application attribute on proxy types
`HelloWorld` sample	`_AndroidTypeMapImplementation=trimmable`

Part of #10807 (build pipeline, targets, manifest integration, native stubs)

samples/HelloTrimmable/trimmable-override.targets

...id.Build.Tasks/Microsoft.Android.Sdk/targets/Microsoft.Android.Sdk.TypeMap.Trimmable.targets

....Tasks/Microsoft.Android.Sdk/targets/Microsoft.Android.Sdk.TypeMap.Trimmable.CoreCLR.targets

…t providers - Fix Categories parsing: remove TryGetNamedArgument<string> guard that always returns false for string[] properties. Directly iterate named arguments with IReadOnlyCollection<> cast. - Delete empty ManifestModel.cs placeholder (all types in JavaPeerInfo.cs). - Document ApplicationRegistration.java: registerApplications() is intentionally empty in the trimmable path (types activated via registerNatives + UCO wrappers, not Runtime.register). - Add TODO for multi-process per-provider .java generation. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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

Enables ILLink to trim TrimmableTypeMap code paths when ILLink runs (e.g. with PublishTrimmed=true or AOT). Without this, the feature switch is unknown to the trimmer and both branches are preserved. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

get_TargetType is no longer emitted on proxy types — it's inherited from the generic base class JavaPeerProxy<T>. Update test assertions. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Use $(IntermediateOutputPath) instead of manually constructing the path from $(BaseIntermediateOutputPath)$(Configuration)/$(TargetFramework)/. The manual construction breaks when AppendTargetFrameworkToOutputPath is false, as in the test infrastructure. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

1. Add $(_AndroidManifestAbs) to _GenerateTrimmableTypeMap Inputs so manifest changes trigger re-generation. 2. Use @(ReferencePath->Count()) instead of '@(ReferencePath)' != '' to avoid string-joining hundreds of assembly paths. 3. Add XA4212 and XA4217 error codes for duplicate/conflicting [Application] attributes (replacing bare Log.LogError calls). 4. Add copied Java files, ApplicationRegistration.java, AndroidManifest, and acw-map.txt to @(FileWrites) so IncrementalClean won't delete them. 5. Add Inputs/Outputs to _PrepareNativeAssemblySources so MSBuild can skip it on incremental builds. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Pass AcwMapOutputFile to GenerateTrimmableTypeMap so AcwMapWriter produces real managed→Java mappings for _ConvertCustomView and layout fixup. The <Touch> in _GenerateJavaStubs now only creates an empty placeholder when _GenerateTrimmableTypeMap was skipped. The generated acw-map.txt is tracked in @(FileWrites) from both targets. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Move business logic into a core class in the TrimmableTypeMap project. The MSBuild task becomes a thin adapter. Tests instantiate the generator directly — no MSBuild ceremony needed for unit testing. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

samples/HelloWorld/HelloWorld/HelloWorld.DotNet.csproj

src/Microsoft.Android.Sdk.TrimmableTypeMap/Microsoft.Android.Sdk.TrimmableTypeMap.csproj

...in.Android.Build.Tasks/Microsoft.Android.Sdk/targets/Microsoft.Android.Sdk.NativeAOT.targets

- Remove commented-out lines in TypeMapAssemblyGeneratorTests and TypeMapModelBuilderTests - Replace WriteLinesToFile inline Java with a static ApplicationRegistration.Trimmable.java file - Remove UseMonoRuntime from HelloWorld.DotNet.csproj (not needed) - Move MSBuildPackageReferenceVersion to eng/Versions.props (centralize with other package versions) - Fix TrimmableTypeMap feature switch in NativeAOT.targets: Value=true (NativeAOT uses trimmable typemap) Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

simonrozsival

🤖 AI Review Summary

Verdict: ⚠️ Needs Changes

Found 5 issues: 2 errors, 2 warnings, 1 suggestion.

❌ Localization — Error messages hardcoded as strings instead of Properties.Resources.XA#### (TrimmableTypeMapGenerator.cs:247,261,263)
❌ Platform-specific — Backslash path separators in cross-platform target will break the Mac/Linux build (Microsoft.Android.Sdk.TypeMap.Trimmable.targets:103,105,108)
⚠️ Code organization — ~13 new public types added to JavaPeerInfo.cs; one type per file (JavaPeerInfo.cs:322+)
⚠️ Nullable — string.IsNullOrEmpty(x) should use the .IsNullOrEmpty() extension (multiple files)
💡 Patterns — TrimmableTypeMapResult record exposes List<string> in public API; prefer IReadOnlyList<string>

👍 Great use of sealed record types for data carriers, proper #nullable enable, thorough XML docs, and clean Inputs/Outputs for incremental builds. The GetNativeCallbackName/ParseConnectorDeclaringType refactoring is well-reasoned.

⚠️ CI: Linux build passed ✅, but Mac and Windows builds are still pending — do not merge until they are green.

Review generated by android-reviewer from review guidelines.

src/Microsoft.Android.Sdk.TrimmableTypeMap/TrimmableTypeMapGenerator.cs

...id.Build.Tasks/Microsoft.Android.Sdk/targets/Microsoft.Android.Sdk.TypeMap.Trimmable.targets

src/Microsoft.Android.Sdk.TrimmableTypeMap/Scanner/JavaPeerInfo.cs

src/Microsoft.Android.Sdk.TrimmableTypeMap/Generator/ManifestGenerator.cs

src/Microsoft.Android.Sdk.TrimmableTypeMap/TrimmableTypeMapGenerator.cs

- Use Properties.Resources.XA#### for error messages (XA4212, XA4213, XA4217) - Add Properties/Resources.resx + Resources.Designer.cs to TrimmableTypeMap project - Remove XA4212/XA4217 from Xamarin.Android.Build.Tasks resources (they are only used in TrimmableTypeMapGenerator, not in any Build.Tasks code path) - Fix cross-platform path separator bugs in Trimmable.targets - Replace \**\*.java glob with /**/*.java - Replace android\src\ destination paths with android/src/ - Replace ..\ TrimmerRootDescriptor path with ../ - Split 13 new types out of JavaPeerInfo.cs (one type per file) - ComponentInfo.cs (ComponentKind + ComponentInfo) - IntentFilterInfo.cs - MetaDataInfo.cs - AssemblyManifestInfo.cs - ManifestAttributeInfo.cs (Permission*, UsesPermission, UsesFeature, UsesLibrary, UsesConfiguration, PropertyInfo) - TrimmableTypeMapTypes.cs (ManifestConfig + TrimmableTypeMapResult) - Replace string.IsNullOrEmpty() static calls with .IsNullOrEmpty() extension - Add NullableExtensions.cs to TrimmableTypeMap project - ManifestGenerator.cs: 6 occurrences - TrimmableTypeMapGenerator.cs: 3 occurrences - Change List<string> to IReadOnlyList<string> in TrimmableTypeMapResult Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

simonrozsival

🤖 AI Review Summary

Verdict: ⚠️ Needs Changes

Found 4 issues: 1 error + 2 warnings + 1 suggestion.

❌ MSBuild targets: AcwMapOutputFile passed to task but no such property exists → MSB4064 build error (Microsoft.Android.Sdk.TypeMap.Trimmable.targets:77)
⚠️ Code organization: 8 types in ManifestAttributeInfo.cs — one type per file (Scanner/ManifestAttributeInfo.cs:7)
⚠️ Code organization: ManifestGenerator unnecessarily made public — new helpers default to internal (Generator/ManifestGenerator.cs:16)
💡 MSBuild targets: AfterTargets="CoreCompile" runs even if CoreCompile fails; consider $(MSBuildLastTaskResult) guard

👍 The overall architecture is solid: AndroidTask with correct TaskPrefix, [Required] property conventions followed, error codes from Properties.Resources, IsNullOrEmpty() extension used consistently throughout, Files.CopyIfStringChanged in GenerateEmptyTypemapStub, and FileWrites tracked correctly for incremental builds. The JniNameToJavaName fix for $ → . in inner class names is correct and well-tested.

Review generated by android-reviewer from review guidelines.

simonrozsival · 2026-03-25T17:33:28Z

...id.Build.Tasks/Microsoft.Android.Sdk/targets/Microsoft.Android.Sdk.TypeMap.Trimmable.targets

+        ManifestPlaceholders="$(AndroidManifestPlaceholders)"
+        CheckedBuild="$(_AndroidCheckedBuild)"
+        ApplicationJavaClass="$(AndroidApplicationJavaClass)"
+        AcwMapOutputFile="$(IntermediateOutputPath)acw-map.txt">


🤖 ❌ MSBuild targets — AcwMapOutputFile is passed here but the GenerateTrimmableTypeMap C# task class has no such property. MSBuild will fail with MSB4064 ("The 'GenerateTrimmableTypeMap' task does not support the parameter 'AcwMapOutputFile'"). Either add the property to the task class, or remove this line if it was left from an earlier refactor.

Rule: Incremental builds / task parameter accuracy

src/Microsoft.Android.Sdk.TrimmableTypeMap/Scanner/ManifestAttributeInfo.cs

src/Microsoft.Android.Sdk.TrimmableTypeMap/Generator/ManifestGenerator.cs

- Fix AcwMapOutputFile: add property to GenerateTrimmableTypeMap task, wire through TrimmableTypeMapGenerator.Execute, and write acw-map.txt via AcwMapWriter so _ConvertCustomView and _UpdateAndroidResgen get real managed→Java mappings - Split ManifestAttributeInfo.cs: move each of the 8 types to its own file (one type per file rule) - Make ManifestGenerator internal: no external consumers; tests use InternalsVisibleTo - Return IReadOnlyList<string> from public Generate overloads (was IList) Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

…peMapImplementation=trimmable The unconditional Value="true" was causing all non-trimmable NativeAOT builds to fail: ILLink eliminated the legacy binary typemap code path (expecting the trimmable typemap assembly to be present), but the typemap DLLs are only generated when _AndroidTypeMapImplementation=trimmable. When _AndroidTypeMapImplementation=trimmable, Microsoft.Android.Sdk.TypeMap.Trimmable.targets (imported conditionally) already adds RuntimeHostConfigurationOption Value="true", so NativeAOT.targets should not also set it unconditionally. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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

The trimmable typemap targets don't support MonoVM yet, so explicitly set UseMonoRuntime=false for the HelloWorld build in Linux and package test stages. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

- GenerateTrimmableTypeMapTests: assert empty arrays instead of null (the task returns [].ToArray(), not null, for empty results) - Update MonoVM apkdesc baseline: ILLink now trims dead trimmable typemap branches thanks to RuntimeFeature.TrimmableTypeMap=false Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

…ensions, make new types internal - Remove '!' on acwMapOutputPath (line 73) — flow analysis handles nullability - Use .IsNullOrEmpty() instead of 'is not null && .Length > 0' for consistency - Use .IsNullOrEmpty() extension in AssemblyIndex.TryGetNameFromDecodedAttribute - Avoid re-enumeration: store group.ToList() result and use .Count property - Make new types internal: TrimmableTypeMapGenerator, ManifestConfig, TrimmableTypeMapResult, AssemblyManifestInfo, and scanner model types (PermissionInfo, UsesPermissionInfo, etc.) - Add InternalsVisibleTo for Xamarin.Android.Build.Tasks - Keep ComponentInfo, IntentFilterInfo, MetaDataInfo public (referenced by public JavaPeerInfo.ComponentAttribute) Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

…lyfill conflict InternalsVisibleTo exposes the internal NotNullWhenAttribute polyfill from the netstandard2.0 TrimmableTypeMap assembly, which conflicts with Build.Tasks' own polyfill from Java.Interop/NullableAttributes.cs. Remove the IVT and keep TrimmableTypeMapGenerator, ManifestConfig, TrimmableTypeMapResult public instead. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

simonrozsival · 2026-03-27T09:15:37Z

Closing in favor of splitting into smaller, focused PRs. Will open 5 fresh PRs from main with clean history.

simonrozsival changed the title ~~[TrimmableTypeMap] Build pipeline: targets, scanner, generator fixes~~ [WIP][TrimmableTypeMap] Build pipeline: targets, scanner, generator fixes Mar 20, 2026

simonrozsival commented Mar 20, 2026

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[TrimmableTypeMap] Implement runtime TypeManager, ValueManager, and JavaConvert #10967

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[TrimmableTypeMap] Generate AndroidManifest.xml from component attributes (#10807) #10983

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simonrozsival changed the title ~~[WIP][TrimmableTypeMap] Build pipeline: targets, scanner, generator fixes~~ [TrimmableTypeMap] Build pipeline + manifest generation Mar 21, 2026

simonrozsival force-pushed the dev/simonrozsival/trimmable-typemap-build-pipeline branch from e2214d6 to 483dc03 Compare March 21, 2026 06:54

simonrozsival changed the title ~~[TrimmableTypeMap] Build pipeline + manifest generation~~ [TrimmableTypeMap] Build pipeline: targets, scanner, generator fixes Mar 21, 2026

simonrozsival added copilot `copilot-cli` or other AIs were used to author this trimmable-type-map labels Mar 21, 2026

simonrozsival force-pushed the dev/simonrozsival/trimmable-typemap-build-pipeline branch 2 times, most recently from 12a1c2b to 4d55775 Compare March 21, 2026 09:12

simonrozsival force-pushed the dev/simonrozsival/trimmable-typemap-runtime-pr branch from 76a490e to aad2ddb Compare March 21, 2026 09:14

simonrozsival changed the title ~~[TrimmableTypeMap] Build pipeline: targets, scanner, generator fixes~~ [TrimmableTypeMap] Build pipeline + manifest generation Mar 21, 2026

simonrozsival force-pushed the dev/simonrozsival/trimmable-typemap-build-pipeline branch 4 times, most recently from af78ed0 to 5a4a1f3 Compare March 21, 2026 21:31

simonrozsival mentioned this pull request Mar 21, 2026

[TrimmableTypeMap] Generate AndroidManifest.xml from component attributes (#10807) #10990

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simonrozsival force-pushed the dev/simonrozsival/trimmable-typemap-build-pipeline branch from 5a4a1f3 to 2bdc637 Compare March 21, 2026 22:11

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[TrimmableTypeMap] Add ManifestGenerator #10991

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simonrozsival changed the base branch from dev/simonrozsival/trimmable-typemap-runtime-pr to dev/simonrozsival/trimmable-typemap-manifest-generation March 21, 2026 22:14

simonrozsival changed the title ~~[TrimmableTypeMap] Build pipeline + manifest generation~~ [TrimmableTypeMap] Build pipeline: targets, scanner, task, assembly store Mar 21, 2026

simonrozsival marked this pull request as ready for review March 21, 2026 22:38

simonrozsival requested a review from jonathanpeppers as a code owner March 21, 2026 22:38

Copilot AI review requested due to automatic review settings March 21, 2026 22:38

simonrozsival requested a review from grendello as a code owner March 21, 2026 22:38

Copilot started reviewing on behalf of simonrozsival March 21, 2026 22:38 View session

simonrozsival mentioned this pull request Mar 25, 2026

[TrimmableTypeMap] Root manifest-referenced types as unconditional #11016

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simonrozsival and others added 9 commits March 25, 2026 17:16

Fix: reset Java.Interop submodule to match base

2d03c56

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

Fix test: JniNameToJavaName now converts $ to . for inner classes

7e3c653

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

Fix tests: get_TargetType inherited from JavaPeerProxy<T>

443396d

get_TargetType is no longer emitted on proxy types — it's inherited from the generic base class JavaPeerProxy<T>. Update test assertions. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

simonrozsival force-pushed the dev/simonrozsival/trimmable-typemap-build-pipeline branch from 6f42b4d to 384a5a8 Compare March 25, 2026 16:16

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simonrozsival and others added 4 commits March 25, 2026 18:40

Revert NativeAOT TrimmableTypeMap wiring; defer to separate PR

1a990b0

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

[CI] Use CoreCLR for HelloWorld smoke test

03fb97e

The trimmable typemap targets don't support MonoVM yet, so explicitly set UseMonoRuntime=false for the HelloWorld build in Linux and package test stages. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

simonrozsival mentioned this pull request Mar 26, 2026

Add ci-status Copilot skill for PR build investigation #11024

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simonrozsival force-pushed the dev/simonrozsival/trimmable-typemap-build-pipeline branch from 89052b9 to 3c1d9d7 Compare March 26, 2026 14:08

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[TrimmableTypeMap] Build pipeline: targets, scanner, task, assembly store#10980

[TrimmableTypeMap] Build pipeline: targets, scanner, task, assembly store#10980
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Summary

Scanner extensions (AssemblyIndex.cs, JavaPeerInfo.cs, JavaPeerScanner.cs)

GenerateTrimmableTypeMap task

JCW generation fixes

Trimmer size regression prevention

MSBuild targets

Trimmable.targets

Trimmable.CoreCLR.targets

Tests

Other

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simonrozsival commented Mar 20, 2026 •

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Scanner extensions (`AssemblyIndex.cs`, `JavaPeerInfo.cs`, `JavaPeerScanner.cs`)

`GenerateTrimmableTypeMap` task

`Trimmable.targets`

`Trimmable.CoreCLR.targets`