2018-07-18 11:55:32 +02:00
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# Work in progress cranelift codegen backend for rust
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2018-10-10 19:12:41 +02:00
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> ⚠⚠⚠ This doesn't do much useful yet ⚠⚠⚠
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2018-07-18 11:55:32 +02:00
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## Building
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```bash
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2018-07-18 13:35:03 +02:00
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$ git clone https://github.com/bjorn3/rustc_codegen_cranelift.git
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2018-07-18 11:55:32 +02:00
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$ cd rustc_codegen_cranelift
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2018-11-16 17:05:59 +01:00
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$ rustup override set nightly # This uses unstable api's which will never be stabilized
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$ cargo install xargo # Used for building the sysroot
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$ cargo install hyperfine # Used for benchmarking in build.sh
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2018-07-18 11:55:32 +02:00
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$ cargo build
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```
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## Usage
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```bash
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2018-11-16 17:05:59 +01:00
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$ rustc -Zcodegen-backend=$(pwd)/target/debug/librustc_codegen_cranelift.so my_crate.rs
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2018-07-18 11:55:32 +02:00
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```
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2018-11-16 17:05:59 +01:00
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## Build sysroot and test
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2018-07-18 13:35:03 +02:00
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```bash
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2018-11-16 17:05:59 +01:00
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$ rustup component add rust-src # Make sure the sysroot source is availablr
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$ ./prepare_libcore.sh # Patch the sysroot source for some not yet supported things
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2018-07-18 13:35:03 +02:00
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$ ./build.sh
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```
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2018-07-18 11:55:32 +02:00
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## Not yet supported
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2018-11-16 17:05:59 +01:00
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* Good non-rust abi support ([non scalars are not yet supported for the "C" abi](https://github.com/bjorn3/rustc_codegen_cranelift/issues/10))
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* Checked binops ([some missing instructions in cranelift](https://github.com/CraneStation/cranelift/issues/460))
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* Inline assembly ([no cranelift support](https://github.com/CraneStation/cranelift/issues/444))
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* Varargs ([no cranelift support](https://github.com/CraneStation/cranelift/issues/212))
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* libstd (needs varargs and some other stuff) ([tracked here](https://github.com/bjorn3/rustc_codegen_cranelift/issues/146))
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* u128 and i128 ([no cranelift support](https://github.com/CraneStation/cranelift/issues/354))
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* SIMD (huge amount of work to get all intrinsics implemented, so may never be supported)
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