| commit | 2f849cffd6c7cb5c0988b7c805cd51e7ebdc618b | [log] [tgz] |
|---|---|---|
| author | Lukasz Anforowicz <lukasza@google.com> | Thu Nov 17 15:52:39 2022 -0800 |
| committer | Copybara-Service <copybara-worker@google.com> | Thu Nov 17 15:53:09 2022 -0800 |
| tree | 7a07c3511d37dcfaead2537f7b9434bb02ad37d2 | |
| parent | 519705f755261899ce5d5cc517f7938ccd25f4aa [diff] |
Support calling Rust-ABI functions through the generated bindings. Before this CL the tool would only generate meaningful code in the ..._cc_api.h file. This was sufficient for invoking `pub extern "C" fn` Rust functions (simply redeclaring `#[no_mangle]` functions in C++, or defining a small, `inline` C++ function that forwards to a slightly renamed `#[export_name = ...]` function). After this CL the tool will also populate ..._cc_api_impl.rs file with Rust thunks that expose `pub fn` Rust functions that use the default Rust ABI (rather than using `extern "C"` to ask for C ABI). A small, `inline` C++ function is generated to call into the think (quite similar to how the `#[export_name = ...]` case is handled). The thunks expose the same parameter and return types as the original function via C ABI. (Currently the tool only supports a limited set of parameter types and return types - all of the supported types can be directly used in an `extedn "C"` function/thunk.) PiperOrigin-RevId: 489328746
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