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# Swift Bindings for LLVM
Swift Bindings for LLVM is a part of the Swift project, and aims to make it
easier and more convenient to use [LLVM](https://github.com/llvm/llvm-project)
APIs from Swift code.
It relies on the experimental Swift/C++ Interoperability, which allows calling
C++ APIs directly from Swift, removing the need for a C bridging layer.
This is a work-in-progress. The design of the bindings will be changing as
Swift/C++ Interoperability evolves.
## Trying it out
### Within the Swift compiler project
(This will be updated once the Swift compiler starts using Swift LLVM Bindings.)
### As a standalone project
A [Swift Development Snapshot](https://www.swift.org/download/#snapshots)
toolchain is required to build the project. Using the latest available trunk
snapshot is recommended.
Since the bindings rely on LLVM headers, you will need a fresh checkout of LLVM
locally. Both upstream LLVM
([llvm/llvm-project](https://github.com/llvm/llvm-project)) and Apple's
LLVM fork ([apple/llvm-project](https://github.com/apple/llvm-project)) are
supported.
Similarly to LLVM, CMake is used to build the bindings. To configure the build
process, run the following command:
```
cmake -G Ninja \
-D CMAKE_BUILD_TYPE=Debug \
-D CMAKE_Swift_COMPILER=/Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-{YYYY-MM-DD}.xctoolchain/usr/bin/swiftc \
-D LLVM_DIR={PATH_TO_LLVM_BUILD_ROOT}/lib/cmake/llvm \
-B {PATH_TO_BUILD_ROOT}
```
To build all of the bindings, run:
```
cmake --build {PATH_TO_BUILD_ROOT} --target all
```
To build the bindings for a specific LLVM module (e.g. `LLVM_Utils`), run:
```
cmake --build {PATH_TO_BUILD_ROOT} --target LLVM_Utils
```
## Branching scheme
`llvm.org/main` branch tracks the `main` branch
of ([llvm/llvm-project](https://github.com/llvm/llvm-project)).
`stable/YYYYMMDD` branch tracks the corresponding `stable/YYYYMMDD` branch
of ([apple/llvm-project](https://github.com/apple/llvm-project)).
## Contributing
If you are working on a feature that you intend to use in SwiftCompilerSources,
you should create pull requests against two branches: `llvm.org/main`
and `stable/YYYYMMDD`. If you are merging the pull requests yourself, please
make sure you merge the pull request to `llvm.org/main` branch first.
Otherwise, you should create pull requests against `llvm.org/main` branch only.
|
