[typemap] Preserve exported constructor throws metadata - #12564
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jonathanpeppers merged 3 commits intoAug 31, 2026
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Carry exported constructor exception metadata through scanning and Java source generation, and add constructor activation coverage for checked exceptions and caller-directed closed generic wrappers. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Convert JNI exception names before checking Java source identifiers so reserved package and nested-type segments are diagnosed for constructors and methods. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
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Copilot review overview
Review tier: Lite
Findings: 1
New issues introduced by this change (1)
| Severity | Finding |
|---|---|
 |
tests/Mono.Android-Tests/Mono.Android-Tests/Java.Interop/JnienvTest.cs — second is not disposed when Assert.AreSame fails. If GetObject ever… |
What changed in this PR
This PR closes a remaining trimmable typemap parity gap by carrying [Export(... Throws = ...)] exception metadata through scanning and into generated JCW Java constructors (not just methods), while validating/normalizing exception type names for Java source emission. It also adds targeted runtime/integration/unit test coverage for constructor throws propagation and for stable peer identity / exactly-once activation in closed-generic wrapping scenarios.
Changes:
- Propagate
[Export]constructor thrown exception metadata through the trimmable typemap scanner model and into the JCW Java source generator (throwsclauses for constructors). - Normalize/validate thrown exception names via JNI→Java-source conversion before reserved-identifier validation.
- Add/extend runtime, integration, and generator tests to cover constructor
throwsclauses and closed-generic wrapper activation/identity.
| File | Description |
|---|---|
| tests/Mono.Android-Tests/Mono.Android-Tests/Java.Interop/JnienvTest.cs | Adds runtime coverage for wrapping an existing Java handle as a known closed generic type and ensuring stable peer identity / single activation. |
| tests/Mono.Android-Tests/Mono.Android-Tests/Java.Interop/ConstructorActivationTests.cs | Adds Java-side activation coverage for an [Export] constructor declaring Throws. |
| tests/Microsoft.Android.Sdk.TrimmableTypeMap.Tests/TestFixtures/TestTypes.cs | Extends fixture types to include an [Export] constructor with declared thrown exception names. |
| tests/Microsoft.Android.Sdk.TrimmableTypeMap.Tests/TestFixtures/StubAttributes.cs | Updates stub Java.Interop.ExportAttribute to support constructors and SuperArgumentsString for scanning/generation tests. |
| tests/Microsoft.Android.Sdk.TrimmableTypeMap.Tests/Generator/TrimmableTypeMapGeneratorTests.cs | Updates reserved-name validation coverage to include thrown exception references in constructor/method validation. |
| tests/Microsoft.Android.Sdk.TrimmableTypeMap.Tests/Generator/JcwJavaSourceGeneratorTests.cs | Adds unit coverage asserting generated Java constructors include a throws clause. |
| tests/Microsoft.Android.Sdk.TrimmableTypeMap.IntegrationTests/UserTypesFixture/UserTypes.cs | Adds an [Export] constructor with Throws to the integration fixture. |
| tests/Microsoft.Android.Sdk.TrimmableTypeMap.IntegrationTests/ScannerExportShapesTests.cs | Adds integration assertions that constructor thrown exceptions are surfaced by the scanner model. |
| src/Microsoft.Android.Sdk.TrimmableTypeMap/TrimmableTypeMapGenerator.cs | Validates constructor/method thrown exception names after JNI→Java conversion for Java-source identifier checks. |
| src/Microsoft.Android.Sdk.TrimmableTypeMap/Scanner/JavaPeerScanner.cs | Propagates ThrownNames from constructor marshal-methods into JavaConstructorInfo. |
| src/Microsoft.Android.Sdk.TrimmableTypeMap/Scanner/JavaPeerInfo.cs | Extends JavaConstructorInfo model with ThrownNames metadata. |
| src/Microsoft.Android.Sdk.TrimmableTypeMap/Generator/JcwJavaSourceGenerator.cs | Emits throws clauses for generated Java constructors and centralizes throws-clause formatting with JNI→Java conversion. |
This was referenced Aug 28, 2026
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
jonathanpeppers
approved these changes
Aug 31, 2026
jonathanpeppers
deleted the
simonrozsival-trimmable-typemap-parity-gaps
branch
August 31, 2026 13:47
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Summary
[Export(Throws = ...)]metadata on generated Java constructorsthrowsclausesTDD matrix
The constructor fixture passed with
llvm-irand failed with the original trimmable typemap because its generated Java constructor omitted the checked exception declaration. After the fix, the unchanged constructor parity category passes under:Additional validation:
Microsoft.Android.Sdk.TrimmableTypeMap.Tests: 771/771Microsoft.Android.Sdk.TrimmableTypeMap.IntegrationTests: 24/24Fixes #12561