Readme.md

   1 # Work in progress cranelift codegen backend for rust
   2
   3 > ⚠⚠⚠ This doesn't do anything useful yet ⚠⚠⚠
   4
   5 ## Building
   6
   7 ```bash
   8 $ git clone https://github.com/bjorn3/rustc_codegen_cranelift.git
   9 $ cd rustc_codegen_cranelift
  10 $ rustup override set nightly
  11 $ git submodule update --init
  12 $ cargo build
  13 ```
  14
  15 ## Usage
  16
  17 ```bash
  18 $ rustc -Zcodegen-backend=$(pwd)/target/debug/librustc_codegen_cranelift.so my_crate.rs --crate-type lib -Og
  19 ```
  20
  21 > You must compile with `-Og`, because checked binops are not yet supported.
  22
  23 ## Building libcore
  24
  25 ```bash
  26 $ git clone https://github.com/rust-lang/rust.git
  27 $ cd rust
  28 $ git apply ../0001-Disable-stdsimd-in-libcore.patch
  29 $ git apply ../0002-Disable-u128-and-i128-in-libcore.patch
  30 $ cd ../
  31 $ ./build.sh
  32 ```
  33
  34 > ⚠⚠⚠ You will get a panic because of unimplemented stuff ⚠⚠⚠
  35
  36 ## Not yet supported
  37
  38 * [ ] Checked binops
  39 * [ ] Statics
  40 * [ ] Drop glue
  41
  42 * [ ] Building libraries
  43 * [ ] Other call abi's
  44 * [ ] Unsized types
  45 * [ ] Slice indexing
  46 * [ ] Sub slice
  47 * [ ] Closures
  48 * [ ] Some rvalue's
  49
  50 * [ ] Inline assembly
  51 * [ ] Custom sections
  52
  53 ## Known errors
  54
  55 * [ ] cranelift-module api seems to be used wrong, thus causing panic for some consts
  56 * [ ] cranelift-codegen doesn't have encodings for some instructions for types smaller than I32