2019-09-20 02:54:23 -05:00
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# WIP Cranelift codegen backend for rust
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2018-07-18 04:55:32 -05:00
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2019-09-20 02:54:23 -05:00
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> ⚠⚠⚠ Threads and certain kinds of FFI don't work yet. ⚠⚠⚠
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2018-07-18 04:55:32 -05:00
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## Building
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```bash
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2018-07-18 06:35:03 -05:00
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$ git clone https://github.com/bjorn3/rustc_codegen_cranelift.git
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2018-07-18 04:55:32 -05:00
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$ cd rustc_codegen_cranelift
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2019-04-14 03:49:07 -05:00
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$ ./prepare.sh # download and patch sysroot src and install hyperfine for benchmarking
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2020-01-15 04:53:24 -06:00
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$ ./test.sh --release
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2018-07-18 04:55:32 -05:00
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```
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## Usage
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2019-01-26 10:03:35 -06:00
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`$cg_clif_dir` is the directory you cloned this repo into in the following instruction.
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2019-09-12 13:27:10 -05:00
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### Cargo
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2019-01-26 10:03:35 -06:00
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2018-07-18 04:55:32 -05:00
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```bash
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2020-03-11 13:54:18 -05:00
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$ export CG_CLIF_INCR_CACHE=1 # Enable caching of object files in the incremental cache
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2020-01-15 04:53:24 -06:00
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$ CHANNEL="release" $cg_clif_dir/cargo.sh run
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2018-07-18 04:55:32 -05:00
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```
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2020-01-15 04:53:24 -06:00
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If you compiled cg_clif in debug mode you should use `CHANNEL="debug"` instead or omit `CHANNEL="release"` completely.
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2019-09-12 13:27:10 -05:00
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### Rustc
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2018-07-18 06:35:03 -05:00
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```bash
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2020-03-11 13:54:18 -05:00
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$ export CG_CLIF_INCR_CACHE=1 # Enable caching of object files in the incremental cache
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2020-01-15 04:53:24 -06:00
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$ rustc -Cpanic=abort -Zcodegen-backend=$cg_clif_dir/target/release/librustc_codegen_cranelift.so --sysroot $cg_clif_dir/build_sysroot/sysroot my_crate.rs
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2018-07-18 06:35:03 -05:00
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```
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2019-09-12 13:27:10 -05:00
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2018-07-18 04:55:32 -05:00
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## Not yet supported
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2019-09-12 13:27:10 -05:00
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* Good non-rust abi support ([several problems](https://github.com/bjorn3/rustc_codegen_cranelift/issues/10))
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2018-11-16 10:05:59 -06:00
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* Checked binops ([some missing instructions in cranelift](https://github.com/CraneStation/cranelift/issues/460))
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2019-09-12 13:27:10 -05:00
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* Inline assembly ([no cranelift support](https://github.com/CraneStation/cranelift/issues/444), not coming soon)
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2019-07-30 07:51:05 -05:00
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* SIMD ([tracked here](https://github.com/bjorn3/rustc_codegen_cranelift/issues/171), some basic things work)
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