| commit | 38489504f0baf4e454e7769bdd18c60fb9d050ee | [log] [tgz] |
|---|---|---|
| author | Jing Lu <lujin@google.com> | Mon Jul 10 10:26:06 2023 -0700 |
| committer | Copybara-Service <copybara-worker@google.com> | Mon Jul 10 10:27:05 2023 -0700 |
| tree | 743a6f7a3fa4b9d4b3553adc512c73a08691bb6e | |
| parent | 6d9048d8beaea0eea5c5fbd7f093283c4fc82250 [diff] |
Mark `SomeStruct` which is passed across FFI boundary as `#[repr(C)]`
This avoids the warning (hence test failure):
```
error: `extern` fn uses type `SomeStruct`, which is not FFI-safe
--> <crubit_unittests.rs>:1:592
|
1 | ...tOfStruct ; pub fn test_function (_arg : extern "C" fn (SomeStruct , f32) -> f32) { unimplemented ! () }
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
|
= help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
= note: this struct has unspecified layout
note: the type is defined here
```
PiperOrigin-RevId: 546911383
Change-Id: I6ec0bb387a16de33af841e2b3c551a5ded6709b0
Crubit is an experimental bidirectional bindings generator 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.
Crubit allows for C++ code and Rust code to call each other without manually wrapping the APIs in an FFI-friendly interop layer. For example, a C++ function like this:
bool IsAbsPath(std::string_view path);
... becomes callable from Rust as if it were defined as:
pub fn IsAbsPath(path: std::string_view) -> bool {...}
Crubit automatically generates ABI-compatible bindings for structs (which can be passed both by value and by reference), functions, and methods, for a large variety of types. (Trivial types, nontrivial types, templated types, etc.)
$ 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