Hiding more namespace-body-formatting within `code_gen_utils.rs`.

As pointed out in "A Philosophy of Software Design" moving code up or
down the architectural layers can often bring related code together and
therefore help improve modularity of code.  Before this CL
`common/code_gen_utils.rs` would provide
`NamespaceQualifier::format_with_cc_body` and
`cc_bindings_from_rs/bindings.rs` would group consecutive snippets from
the same namespace.  After this CL, all of this is hidden as an
implementation detail of a new `format_namespace_bound_cc_tokens` API
offered by `common/code_gen_utils.rs`.

The public API of `common/code_gen_utils.rs` is slightly simpler before
this CL:
    fn format_with_cc_body(&self, body: TokenStream) -> Result<TokenStream>
and slightly more complicated after this CL:
    pub fn format_namespace_bound_cc_tokens(
        iter: impl IntoIterator<Item = (NamespaceQualifier, TokenStream)>,
    ) -> Result<TokenStream>
Nevertheless, overall the modularity and readability seems improved.

The only behavior change in this CL is to insert an empty line
between different namespaces.

PiperOrigin-RevId: 495980348
2 files changed
tree: f282a734ec43e03682836ce29936d700cd3a579c
  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. .bazelrc
  14. .gitignore
  15. BUILD
  16. Cargo.Bazel.lock
  17. CODE_OF_CONDUCT
  18. CONTRIBUTING
  19. LICENSE
  20. README.md
  21. 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