2018-07-18 04:55:32 -05:00
|
|
|
# Work in progress cranelift codegen backend for rust
|
|
|
|
|
|
|
|
|
|
> ⚠⚠⚠ This doesn't do anything useful yet ⚠⚠⚠
|
|
|
|
|
|
|
|
|
|
## Building
|
|
|
|
|
|
|
|
|
|
```bash
|
2018-07-18 06:35:03 -05:00
|
|
|
$ git clone https://github.com/bjorn3/rustc_codegen_cranelift.git
|
2018-07-18 04:55:32 -05:00
|
|
|
$ cd rustc_codegen_cranelift
|
2018-07-19 10:59:13 -05:00
|
|
|
$ rustup override set nightly
|
2018-07-18 04:55:32 -05:00
|
|
|
$ git submodule update --init
|
|
|
|
|
$ cargo build
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
## Usage
|
|
|
|
|
|
|
|
|
|
```bash
|
|
|
|
|
$ rustc -Zcodegen-backend=$(pwd)/target/debug/librustc_codegen_cranelift.so my_crate.rs --crate-type lib -Og
|
|
|
|
|
```
|
|
|
|
|
|
2018-07-18 06:35:03 -05:00
|
|
|
## Building libcore
|
|
|
|
|
|
|
|
|
|
```bash
|
2018-07-19 11:41:37 -05:00
|
|
|
$ rustup component add rust-src
|
|
|
|
|
$ ./prepare_libcore.sh
|
2018-07-18 06:35:03 -05:00
|
|
|
$ ./build.sh
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
> ⚠⚠⚠ You will get a panic because of unimplemented stuff ⚠⚠⚠
|
|
|
|
|
|
2018-07-18 04:55:32 -05:00
|
|
|
## Not yet supported
|
|
|
|
|
|
2018-07-19 12:08:37 -05:00
|
|
|
* Checked binops
|
|
|
|
|
* Statics
|
|
|
|
|
* Drop glue
|
2018-07-18 04:55:32 -05:00
|
|
|
|
2018-07-19 12:08:37 -05:00
|
|
|
* Building libraries
|
|
|
|
|
* Other call abi's
|
|
|
|
|
* Unsized types
|
|
|
|
|
* Slice indexing
|
|
|
|
|
* Sub slice
|
|
|
|
|
* Some rvalue's
|
2018-07-18 04:55:32 -05:00
|
|
|
|
2018-07-19 12:08:37 -05:00
|
|
|
* Inline assembly
|
|
|
|
|
* Custom sections
|
2018-07-18 09:29:40 -05:00
|
|
|
|
|
|
|
|
## Known errors
|
|
|
|
|
|
2018-07-19 12:08:37 -05:00
|
|
|
* cranelift-module api seems to be used wrong, thus causing panic for some consts
|
|
|
|
|
* cranelift-codegen doesn't have encodings for some instructions for types smaller than I32
|
|
|
|
|
|
|
|
|
|
```
|
|
|
|
|
[...]
|
|
|
|
|
warning: DefId(0/0:128 ~ lib[8787]::f64[0]::{{impl}}[0]::classify[0]):
|
|
|
|
|
fn f64::<impl at ./target/libcore/src/libcore/num/f64.rs:156:1: 490:2>::classify(_1: f64) -> num::FpCategory{
|
|
|
|
|
[...]
|
|
|
|
|
}
|
|
|
|
|
warning: stmt _3 = _1
|
|
|
|
|
warning: stmt _5 = BitAnd(move _6, const Unevaluated(DefId(0/0:130 ~ lib[8787]::f64[0]::{{impl}}[0]::classify[0]::MAN_MASK[0]), []):u64)
|
|
|
|
|
thread 'main' panicked at 'called `Option::unwrap()` on a `None` value', libcore/option.rs:345:21
|
|
|
|
|
stack backtrace:
|
|
|
|
|
[...]
|
|
|
|
|
10: <core::option::Option<T>>::unwrap
|
|
|
|
|
at /checkout/src/libcore/macros.rs:20
|
|
|
|
|
11: rustc_codegen_cranelift::constant::trans_constant
|
|
|
|
|
at src/constant.rs:26
|
|
|
|
|
[...]
|
|
|
|
|
```
|
