76 lines
2.8 KiB
Markdown
76 lines
2.8 KiB
Markdown
# Cranelift codegen backend for rust
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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).
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This has the potential to improve compilation times in debug mode.
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If your project doesn't use any of the things listed under "Not yet supported", it should work fine.
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If not please open an issue.
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## Building and testing
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```bash
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$ git clone https://github.com/bjorn3/rustc_codegen_cranelift.git
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$ cd rustc_codegen_cranelift
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$ ./y.rs prepare # download and patch sysroot src and install hyperfine for benchmarking
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$ ./y.rs build
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```
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To run the test suite replace the last command with:
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```bash
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$ ./test.sh
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```
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This will implicitly build cg_clif too. Both `y.rs build` and `test.sh` accept a `--debug` argument to
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build in debug mode.
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Alternatively you can download a pre built version from [GHA]. It is listed in the artifacts section
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of workflow runs. Unfortunately due to GHA restrictions you need to be logged in to access it.
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[GHA]: https://github.com/bjorn3/rustc_codegen_cranelift/actions?query=branch%3Amaster+event%3Apush+is%3Asuccess
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## Usage
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rustc_codegen_cranelift can be used as a near-drop-in replacement for `cargo build` or `cargo run` for existing projects.
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Assuming `$cg_clif_dir` is the directory you cloned this repo into and you followed the instructions (`y.rs prepare` and `y.rs build` or `test.sh`).
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In the directory with your project (where you can do the usual `cargo build`), run:
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```bash
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$ $cg_clif_dir/build/cargo build
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```
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This will build your project with rustc_codegen_cranelift instead of the usual LLVM backend.
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For additional ways to use rustc_codegen_cranelift like the JIT mode see [usage.md](docs/usage.md).
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## Configuration
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See the documentation on the `BackendConfig` struct in [config.rs](src/config.rs) for all
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configuration options.
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## Not yet supported
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* Inline assembly ([no cranelift support](https://github.com/bytecodealliance/wasmtime/issues/1041))
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* On Linux there is support for invoking an external assembler for `global_asm!` and `asm!`.
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`llvm_asm!` will remain unimplemented forever. `asm!` doesn't yet support reg classes. You
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have to specify specific registers instead.
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* SIMD ([tracked here](https://github.com/bjorn3/rustc_codegen_cranelift/issues/171), some basic things work)
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## License
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Licensed under either of
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* Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or
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http://www.apache.org/licenses/LICENSE-2.0)
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* MIT license ([LICENSE-MIT](LICENSE-MIT) or
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http://opensource.org/licenses/MIT)
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at your option.
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### Contribution
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Unless you explicitly state otherwise, any contribution intentionally submitted
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for inclusion in the work by you shall be dual licensed as above, without any
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additional terms or conditions.
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