1 # Cranelift codegen backend for rust
3 The goal of this project is to create an alternative codegen backend for the rust compiler based on [Cranelift](https://github.com/bytecodealliance/wasmtime/blob/main/cranelift).
4 This has the potential to improve compilation times in debug mode.
5 If your project doesn't use any of the things listed under "Not yet supported", it should work fine.
6 If not please open an issue.
8 ## Building and testing
11 $ git clone https://github.com/bjorn3/rustc_codegen_cranelift
12 $ cd rustc_codegen_cranelift
17 To run the test suite replace the last command with:
23 For more docs on how to build and test see [build_system/usage.txt](build_system/usage.txt) or the help message of `./y.rs`.
25 Alternatively you can download a pre built version from [Github Actions]. It is listed in the artifacts section
26 of workflow runs. Unfortunately due to GHA restrictions you need to be logged in to access it.
28 [Github Actions]: https://github.com/bjorn3/rustc_codegen_cranelift/actions?query=branch%3Amaster+event%3Apush+is%3Asuccess
32 rustc_codegen_cranelift can be used as a near-drop-in replacement for `cargo build` or `cargo run` for existing projects.
34 Assuming `$cg_clif_dir` is the directory you cloned this repo into and you followed the instructions (`y.rs prepare` and `y.rs build` or `test.sh`).
36 In the directory with your project (where you can do the usual `cargo build`), run:
39 $ $cg_clif_dir/dist/cargo-clif build
42 This will build your project with rustc_codegen_cranelift instead of the usual LLVM backend.
44 For additional ways to use rustc_codegen_cranelift like the JIT mode see [usage.md](docs/usage.md).
48 See the documentation on the `BackendConfig` struct in [config.rs](src/config.rs) for all
49 configuration options.
53 * Inline assembly ([no cranelift support](https://github.com/bytecodealliance/wasmtime/issues/1041))
54 * On UNIX there is support for invoking an external assembler for `global_asm!` and `asm!`.
55 * SIMD ([tracked here](https://github.com/bjorn3/rustc_codegen_cranelift/issues/171), `std::simd` fully works, `std::arch` is partially supported)
56 * Unwinding on panics ([no cranelift support](https://github.com/bytecodealliance/wasmtime/issues/1677), `-Cpanic=abort` is enabled by default)
60 Licensed under either of
62 * Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or
63 http://www.apache.org/licenses/LICENSE-2.0)
64 * MIT license ([LICENSE-MIT](LICENSE-MIT) or
65 http://opensource.org/licenses/MIT)
71 Unless you explicitly state otherwise, any contribution intentionally submitted
72 for inclusion in the work by you shall be dual licensed as above, without any
73 additional terms or conditions.