| commit | 96bf0bde7441ee0f0fa087e8963e38d332c58556 | [log] [tgz] |
|---|---|---|
| author | Devin Jeanpierre <jeanpierreda@google.com> | Tue Oct 04 20:32:15 2022 -0700 |
| committer | Copybara-Service <copybara-worker@google.com> | Tue Oct 04 20:32:50 2022 -0700 |
| tree | 752376b690f7627a7d7ddcdd771324f3e72c4573 | |
| parent | 4223859bc18a4f982dc53501ba463c5336d76888 [diff] |
Add custom bindings glue code to the STL, starting with `std::string_view`. This change makes `std::string_view` usable, in a hacky way, from Rust: you can convert a Rust `&'static str` or `&'static [u8]` to a C++ `std::string_view`, and vice versa. This is not *sound*: 1. `string_view` doesn't necessarily obey Rust's aliasing rules. (This is common with all our bindings atm.) 2. `string_view` doesn't currently have lifetime params; we just kinda assume static for now. (This makes Rust code that takes in a string_view about as safe as C++ code that does, to be fair!) Overall, not the worst. And the result is that you really can call APIs that take and return `string_view`. Well, probably. ### How does it work? This reuses `extra_rs_srcs` so that the STL can have additional methods/trait impls. In theory the same mechanism should also work for providing extra sources to any target, but that requires more plumbing / aspect hints / whatever. At the moment this does not expose `extra_rs_srcs` to anything except the STL. But presumably that's an obvious next step, especially if we want to do similar things to support Abseil, and so on. PiperOrigin-RevId: 478948595
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.
$ 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
$ 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