Unify three type nullability traversals, so they don't get out of sync

NullabilityWalker is the source of truth for which type nodes are traversed in
which sequence, and how NullabilityKinds are associated with PointerTypes.

Not a panacea, NullabilityWalker must:
 - stay in sync with expr transfer functions
 - find the same pointers regardless of sugar (I have some further idea here)

The template substitution logic gets folded in as an optional part of
getNullabilityAnnotationsFromType as Dmitri suggested.
While here, give the callback the option to bail out (and we just traverse the
template arg sans sugar) instead of returning an invalid empty vector.
This fixes a couple of testcases.

PiperOrigin-RevId: 503951667
3 files changed
tree: 387501956a2d7b04fc397215ccc54cd4e197c350
  1. .bazelci/
  2. bazel/
  3. cc_bindings_from_rs/
  4. cc_import/
  5. cc_template/
  6. common/
  7. docs/
  8. lifetime_analysis/
  9. lifetime_annotations/
  10. migrator/
  11. nullability_verification/
  12. rs_bindings_from_cc/
  13. support/
  14. .bazelrc
  15. .gitignore
  16. BUILD
  17. Cargo.Bazel.lock
  18. CODE_OF_CONDUCT
  19. CONTRIBUTING
  20. LICENSE
  21. README.md
  22. WORKSPACE
README.md

Crubit: C++/Rust Bidirectional Interop Tool

Build status

Extremely experimental interop tooling for C++ and Rust.

Please don‘t use, this is an experiment and we don’t yet know where will it take us. There will be breaking changes without warning. Unfortunately, we can't take contributions at this point.

Building Crubit

$ apt install clang lld bazel
$ git clone git@github.com:google/crubit.git
$ cd crubit
$ bazel build --linkopt=-fuse-ld=/usr/bin/ld.lld //rs_bindings_from_cc:rs_bindings_from_cc_impl

Using a prebuilt LLVM tree

$ git clone https://github.com/llvm/llvm-project
$ cd llvm-project
$ CC=clang CXX=clang++ cmake -S llvm -B build -DLLVM_ENABLE_PROJECTS='clang' -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=install
$ cmake --build build -j
$ # wait...
$ cmake --install build
$ cd ../crubit
$ LLVM_INSTALL_PATH=../llvm-project/install bazel build //rs_bindings_from_cc:rs_bindings_from_cc_impl