[NativeAOT-LLVM]: Outstanding tasks tracking issue

If someone want to contribute to the NativeAOT-LLVM branch, its not obvious what tasks need doing. This issue is a checklist of tasks that can be picked up by whoever is interested. Hopefully this will encourage engagement by providing a list where the difficulty can be marked. The list is in a vague priority list, top items = higher priority, but that's just my own preference and not official. Feel free to pick anything you like.

• Complete RyuJIT compilation. The LLVM compilation is currently in 2 modules, the old IL->LLVM module, and the new RyuJIT IR -> LLVM module. The latter offers the opportunity to take advantage of RyuJit's optimisations.
  In progress RyuJIT IR instructions:

  • CT_INDIRECT https://github.com/dotnet/runtimelab/pull/1768
  • GT_INDEX/GT_INDEX_ADDR https://github.com/dotnet/runtimelab/pull/1824
  • GT_OBJ/GT_STORE_OBJ https://github.com/dotnet/runtimelab/pull/1825
  • GT_NULLCHECK #1871
  • GT_STORE_BLK
  • GT_ARR_LENGTH
  • GT_SUB
  • GT_FIELD_LIST https://github.com/dotnet/runtimelab/pull/2007
  • Other IR op codes that need implementing can be identified by placing a break point at https://github.com/dotnet/runtimelab/blob/d30559af2b063dcaacdd973d3c9a2107b36c08bb/src/coreclr/jit/llvm.cpp#L1573

• Complete Helper functions

  • CORINFO_HELP_READYTORUN_GENERIC_HANDLE (and generics in general)
  • CORINFO_HELP_READYTORUN_GENERIC_STATIC_BASE
  • CORINFO_HELP_GVMLOOKUP_FOR_SLOT
  • CORINFO_HELP_READYTORUN_DELEGATE_CTOR Some early discussion in #1870

• Merge latest from main/NativeAOT or at least move forward. Note https://github.com/dotnet/runtimelab/pull/1681#issuecomment-954335818

• Release configuration compilation, i.e. src\tests\build nativeaot Release wasm targetsNonWindows skipnative /p:SmokeTestsOnly=true /p:LibrariesConfiguration=Release and src\tests\run runnativeaottests Release wasm currently fails

• Threads

  • Thread suspension: add GC Polls.
  • Confirm atomics are created, for exmaple, Interlocked.*
  • Update runtime code, e.g. where we have #ifndef FEATURE_WASM_THREADS
  • Shadow stack management needs to be moved to Thread (for stack walking non-current threads) (partially done in #2672, still to do is adding shadow stack top to the transition frame)
  • Library code - update for enabling threads.
  • Create new packages, ones for single threaded and ones for multithreaded.
  • Anything else not thought of, build intergration.

• Linux build - see #2605

• Mac build

• Mechanism to allow imports and exports through the WebAssembly Canonical ABI (for more info https://github.com/bytecodealliance/wit-bindgen)

• Wasm Exceptions . Probably have to wait until the RyuJIT compilation is complete as Wasm Exceptions are not compatible with c++ exceptions which are currently produced by the IL->LLVM module

• Remove IL->LLVM module

• Other Smoke tests