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[Unsafe] Type-check JNI callback delegates - #13042
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Dispatch built-in JNI callbacks by concrete delegate type rather than their simple names. A custom delegate with a colliding name must use the Reflection.Emit fallback with its original delegate type and signature. The 40 built-in mappings and their callback wrappers remain unchanged. Context: #11467 Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
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🔵 Needs a closer look
The focused runtime regression test and SDK build were blocked, leaving the changed JNI callback path unvalidated.
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What changed in this PR
Replaces unsafe name-based JNI delegate dispatch with exact runtime-type matching.
Changes:
- Uses typed delegate patterns instead of
Unsafe.As. - Adds regression coverage for same-name custom delegates.
- Keeps generated source synchronized with its T4 template.
| File | Description |
|---|---|
JNINativeWrapper.g.tt |
Updates delegate dispatch generation. |
JNINativeWrapper.g.cs |
Applies generated type-safe mappings. |
JnienvArrayMarshaling.cs |
Adds collision regression test. |
🧠 Review effort: Balanced
Remove the new CreateDelegate regression test as requested. Its call to CreateDelegate also triggers IL3050 during NativeAOT compilation, even though the test is excluded from NativeAOT execution. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
simonrozsival
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The typed dispatch preserves all 40 built-in mappings and their exception/GC-bridge behavior while routing unrelated same-named delegates through the existing fallback. The template, generated source, and updated caller are consistent; no blocking issue remains.
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Pull Request
title and
description
should follow the
commit-messages.mdworkflow documentation, and in particular should include:Summary
JNINativeWrapper.CreateBuiltInDelegatedispatches on the runtime delegate type instead of its simple name. Unrelated custom delegates that collide with built-in names therefore use the existing Reflection.Emit fallback with their original delegate type and signature. All 40 built-in mappings and their wrappers remain unchanged. No new tests are included in this PR.Context
#11467 is broader background only; this PR addresses built-in delegate dispatch and does not close that issue.
Validation
cmpverified the generated source matches the template; all 40 mappings remain../dotnet-local.sh test external/Java.Interop/tests/Xamarin.SourceWriter-Tests/Xamarin.SourceWriter-Tests.csproj -v minimal(11 passed)../dotnet-local.sh test external/Java.Interop/tests/generator-Tests/generator-Tests.csproj -v minimal -p:JavaCPath=/Users/simon/Library/Java/JavaVirtualMachines/jdk-23.0.2+7/Contents/Home/bin/javac -p:JarPath=/Users/simon/Library/Java/JavaVirtualMachines/jdk-23.0.2+7/Contents/Home/bin/jar(526 passed).make prepare && make all:make preparefailed during restore with NU1102 becauseMicrosoft.NETCore.App.Ref10.0.13 is unavailable from the configured feeds;make allwas not reached.dotnet-androidchecks for that commit were listed at the time of this update.