Add a transport package with libmono-profiler-aot.so on Android

[directhex]

This is partially cursed, as runtime.git's packaging infra is opinionated about e.g. overriding PackageID

[jonathanpeppers]

Does this PR produce the package? Was going to download and look at it.

[jonathanpeppers]

So I manually tested the build artifact, and I'm seeing:

02-18 16:56:20.751 20237 20237 W monodroid: Initializing profiler with options: aot:port=9999,output=/data/user/0/com.mono.profiler.hellomaui/files/.__override__/profile.aotprofile
02-18 16:56:20.752 20237 20237 W monodroid: The 'aot' profiler wasn't found in the main executable nor could it be loaded from 'libmono-profiler-aot.so'.

It is inside the .apk:

lib\arm64-v8a\libmono-profiler-aot.so

I reverted to the old files I built myself, and those seem to work. It can load:

02-18 17:04:21.449 26961 26961 W monodroid: Looking for profiler init symbol 'mono_profiler_init_aot'? 0x7000c7855c

Is there enough changes in main, where a build from this PR wouldn't work alongside release/6.0?

[steveisok]

@jonathanpeppers is what you're trying to build easy so that we can test the same thing?

[jonathanpeppers]

It looks like the symbol for mono_profiler_init is there:

$ nm -D -C libmono-profiler-aot.so | grep mono_profiler_init
0000d7cd T mono_profiler_init_aot

The binary I have that works:

$ nm -D -C libmono-profiler-aot.so | grep mono_profiler_init
00015f11 T mono_profiler_init_aot

So then I looked at all symbols with mono, and there is a new one:

$ nm -D -C libmono-profiler-aot.so | grep mono_profiler_set_inline_method_callback
U mono_profiler_set_inline_method_callback

This symbol wasn't there before, would this cause an issue?

[steveisok]

This symbol wasn't there before, would this cause an issue?

Yes, you're going to need a lib that is 1-1 with the runtime version you're using. I can generate one from release/6.0 that you could try.

[jonathanpeppers]

I manually tested a build based on release/6.0 and it seems to work:

https://dev.azure.com/dnceng/internal/_build/results?buildId=1627363&view=results

 Read total 380759 bytes...
Summary:
Modules: 30
Types: 966
Methods: 3,969
Going to write the profile to 'custom.aprof'

[steveisok]

Since the transport package is most useful in release/6.0, we shouldn't merge this to main just yet.

[ghost]

Draft Pull Request was automatically closed for inactivity. Please let us know if you'd like to reopen it.