[TrimmableTypeMap] Generate NativeAOT bootstrap Java sources in trimmable path

[sbomer]

Summary

The trimmable typemap generator handles runtime provider, application registration, and JCW Java source generation — replacing GenerateAdditionalProviderSources for the CoreCLR path. However, it does not generate the two NativeAOT-specific bootstrap Java files:

• JavaInteropRuntime.java — .NET runtime initialization entry point (template with @MAIN_ASSEMBLY_NAME@)
• NativeAotEnvironmentVars.java — baked-in environment variable names/values for the native runtime

These files are currently only generated by GenerateAdditionalProviderSources (in TypeMap.LlvmIr.targets), which is not called from the trimmable path. Without them, NativeAotRuntimeProvider.java fails to compile because it references JavaInteropRuntime and NativeAotEnvironmentVars.

Proposed fix

Add JavaInteropRuntime.java and NativeAotEnvironmentVars.java generation to the trimmable typemap generator, conditioned on _AndroidRuntime == NativeAOT. This is consistent with the existing pattern where the trimmable generator took over the CoreCLR pieces from GenerateAdditionalProviderSources.

Context

• Part of [Epic] Trimmable Type Map for Native AOT and CoreCLR #10788 (Epic: Trimmable Type Map)
• Related to [TrimmableTypeMap] Decompose _GenerateJavaStubs: shared tasks for trimmable path #10807 (Decompose _GenerateJavaStubs)
• Related to [TrimmableTypeMap] NativeAOT end-to-end validation #11052 (NativeAOT end-to-end validation)
• Blocking full NativeAOT + trimmable typemap builds ([NativeAOT] Add trimmable type map build tests and decouple ILC from ILLink #11183)

This content was created with assistance from AI.