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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2018-07-19 10:59:13 -05:00
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$ rustup override set nightly
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2018-07-18 04:55:32 -05:00
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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=$(pwd)/target/debug/librustc_codegen_cranelift.so my_crate.rs --crate-type lib -Og
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```
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> You must compile with `-Og`, because checked binops are not yet supported.
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2018-07-18 06:35:03 -05:00
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## Building libcore
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```bash
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2018-07-19 11:41:37 -05:00
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$ rustup component add rust-src
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$ ./prepare_libcore.sh
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2018-07-18 06:35:03 -05:00
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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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2018-07-19 12:08:37 -05:00
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* Checked binops
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* Statics
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* Drop glue
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2018-07-18 04:55:32 -05:00
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2018-07-19 12:08:37 -05:00
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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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* Some rvalue's
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2018-07-18 04:55:32 -05:00
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2018-07-19 12:08:37 -05:00
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* Inline assembly
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* Custom sections
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2018-07-18 09:29:40 -05:00
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## Known errors
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2018-07-19 12:08:37 -05:00
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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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```
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[...]
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warning: DefId(0/0:128 ~ lib[8787]::f64[0]::{{impl}}[0]::classify[0]):
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fn f64::<impl at ./target/libcore/src/libcore/num/f64.rs:156:1: 490:2>::classify(_1: f64) -> num::FpCategory{
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[...]
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}
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warning: stmt _3 = _1
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warning: stmt _5 = BitAnd(move _6, const Unevaluated(DefId(0/0:130 ~ lib[8787]::f64[0]::{{impl}}[0]::classify[0]::MAN_MASK[0]), []):u64)
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thread 'main' panicked at 'called `Option::unwrap()` on a `None` value', libcore/option.rs:345:21
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stack backtrace:
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[...]
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10: <core::option::Option<T>>::unwrap
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at /checkout/src/libcore/macros.rs:20
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11: rustc_codegen_cranelift::constant::trans_constant
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at src/constant.rs:26
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[...]
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```
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