rust/compiler/rustc_codegen_cranelift
Nicholas Nethercote 4f008e06c3 Clarify Layout interning.
`Layout` is another type that is sometimes interned, sometimes not, and
we always use references to refer to it so we can't take any advantage
of the uniqueness properties for hashing or equality checks.

This commit renames `Layout` as `LayoutS`, and then introduces a new
`Layout` that is a newtype around an `Interned<LayoutS>`. It also
interns more layouts than before. Previously layouts within layouts
(via the `variants` field) were never interned, but now they are. Hence
the lifetime on the new `Layout` type.

Unlike other interned types, these ones are in `rustc_target` instead of
`rustc_middle`. This reflects the existing structure of the code, which
does layout-specific stuff in `rustc_target` while `TyAndLayout` is
generic over the `Ty`, allowing the type-specific stuff to occur in
`rustc_middle`.

The commit also adds a `HashStable` impl for `Interned`, which was
needed. It hashes the contents, unlike the `Hash` impl which hashes the
pointer.
2022-03-07 13:41:47 +11:00
..
.github/workflows Merge commit '40b00f4200fbdeefd11815398cb46394b8cb0a5e' into sync_cg_clif-2021-12-30 2021-12-30 14:53:41 +01:00
.vscode Merge commit '97e504549371d7640cf011d266e3c17394fdddac' into sync_cg_clif-2021-12-20 2021-12-20 18:56:35 +01:00
build_sysroot Merge commit '35d9c6bf256968e1b40e0d554607928bdf9cebea' into sync_cg_clif-2022-02-23 2022-02-23 11:49:34 +01:00
build_system Merge commit '35d9c6bf256968e1b40e0d554607928bdf9cebea' into sync_cg_clif-2022-02-23 2022-02-23 11:49:34 +01:00
docs Merge commit '40b00f4200fbdeefd11815398cb46394b8cb0a5e' into sync_cg_clif-2021-12-30 2021-12-30 14:53:41 +01:00
example Merge commit '40b00f4200fbdeefd11815398cb46394b8cb0a5e' into sync_cg_clif-2021-12-30 2021-12-30 14:53:41 +01:00
patches Merge commit '35d9c6bf256968e1b40e0d554607928bdf9cebea' into sync_cg_clif-2022-02-23 2022-02-23 11:49:34 +01:00
scripts Merge commit '35d9c6bf256968e1b40e0d554607928bdf9cebea' into sync_cg_clif-2022-02-23 2022-02-23 11:49:34 +01:00
src Clarify Layout interning. 2022-03-07 13:41:47 +11:00
.cirrus.yml Merge commit '3a31c6d8272c14388a34622193baf553636fe470' into sync_cg_clif-2021-07-07 2021-07-07 11:14:20 +02:00
.gitattributes
.gitignore Merge commit '40b00f4200fbdeefd11815398cb46394b8cb0a5e' into sync_cg_clif-2021-12-30 2021-12-30 14:53:41 +01:00
Cargo.lock Merge commit '35d9c6bf256968e1b40e0d554607928bdf9cebea' into sync_cg_clif-2022-02-23 2022-02-23 11:49:34 +01:00
Cargo.toml Merge commit '35d9c6bf256968e1b40e0d554607928bdf9cebea' into sync_cg_clif-2022-02-23 2022-02-23 11:49:34 +01:00
clean_all.sh Merge commit '35d9c6bf256968e1b40e0d554607928bdf9cebea' into sync_cg_clif-2022-02-23 2022-02-23 11:49:34 +01:00
config.txt Merge commit '3a31c6d8272c14388a34622193baf553636fe470' into sync_cg_clif-2021-07-07 2021-07-07 11:14:20 +02:00
LICENSE-APACHE
LICENSE-MIT
Readme.md Merge commit '40b00f4200fbdeefd11815398cb46394b8cb0a5e' into sync_cg_clif-2021-12-30 2021-12-30 14:53:41 +01:00
rust-toolchain Merge commit '35d9c6bf256968e1b40e0d554607928bdf9cebea' into sync_cg_clif-2022-02-23 2022-02-23 11:49:34 +01:00
rustfmt.toml
test.sh Merge commit '3a31c6d8272c14388a34622193baf553636fe470' into sync_cg_clif-2021-07-07 2021-07-07 11:14:20 +02:00
y.rs Merge commit '35d9c6bf256968e1b40e0d554607928bdf9cebea' into sync_cg_clif-2022-02-23 2022-02-23 11:49:34 +01:00

Cranelift codegen backend for rust

The goal of this project is to create an alternative codegen backend for the rust compiler based on Cranelift. This has the potential to improve compilation times in debug mode. If your project doesn't use any of the things listed under "Not yet supported", it should work fine. If not please open an issue.

Building and testing

$ git clone https://github.com/bjorn3/rustc_codegen_cranelift.git
$ cd rustc_codegen_cranelift
$ ./y.rs prepare # download and patch sysroot src and install hyperfine for benchmarking
$ ./y.rs build

To run the test suite replace the last command with:

$ ./test.sh

This will implicitly build cg_clif too. Both y.rs build and test.sh accept a --debug argument to build in debug mode.

Alternatively you can download a pre built version from GHA. It is listed in the artifacts section of workflow runs. Unfortunately due to GHA restrictions you need to be logged in to access it.

Usage

rustc_codegen_cranelift can be used as a near-drop-in replacement for cargo build or cargo run for existing projects.

Assuming $cg_clif_dir is the directory you cloned this repo into and you followed the instructions (y.rs prepare and y.rs build or test.sh).

In the directory with your project (where you can do the usual cargo build), run:

$ $cg_clif_dir/build/cargo-clif build

This will build your project with rustc_codegen_cranelift instead of the usual LLVM backend.

For additional ways to use rustc_codegen_cranelift like the JIT mode see usage.md.

Configuration

See the documentation on the BackendConfig struct in config.rs for all configuration options.

Not yet supported

  • Inline assembly (no cranelift support)
    • On Linux there is support for invoking an external assembler for global_asm! and asm!. llvm_asm! will remain unimplemented forever. asm! doesn't yet support reg classes. You have to specify specific registers instead.
  • SIMD (tracked here, some basic things work)

License

Licensed under either of

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you shall be dual licensed as above, without any additional terms or conditions.