2018-07-18 04:55:32 -05:00
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# Work in progress cranelift codegen backend for rust
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> ⚠⚠⚠ This doesn't do anything useful yet ⚠⚠⚠
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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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$ git submodule update --init
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$ cargo build
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```
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## Usage
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```bash
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$ rustc -Zcodegen-backend=$(pwd)/target/debug/librustc_codegen_cranelift.so my_crate.rs --crate-type lib -Og
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```
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> You must compile with `-Og`, because checked binops are not yet supported.
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2018-07-18 06:35:03 -05:00
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## Building libcore
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```bash
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$ git clone https://github.com/rust-lang/rust.git
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$ cd rust
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$ git apply ../0001-Disable-stdsimd-in-libcore.patch
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$ git apply ../0002-Disable-u128-and-i128-in-libcore.patch
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$ cd ../
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$ ./build.sh
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```
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> ⚠⚠⚠ You will get a panic because of unimplemented stuff ⚠⚠⚠
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2018-07-18 04:55:32 -05:00
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## Not yet supported
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* [ ] Checked binops
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* [ ] Statics
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* [ ] Drop glue
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* [ ] Building libraries
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* [ ] Other call abi's
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* [ ] Unsized types
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* [ ] Slice indexing
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* [ ] Sub slice
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* [ ] Closures
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* [ ] Some rvalue's
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* [ ] Inline assembly
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2018-07-18 09:29:40 -05:00
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* [ ] Custom sections
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## Known errors
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* [ ] cranelift-module api seems to be used wrong, thus causing panic for some consts
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* [ ] cranelift-codegen doesn't have encodings for some instructions for types smaller than I32
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* [ ] `thread 'main' panicked at 'assertion failed: !value.has_escaping_regions()', librustc/ty/sty.rs:754:9` in cton_sig_from_mono_fn_sig
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