bjoernager/rust
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Merge commit 'dbee13661e' into sync_cg_clif-2020-12-27

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bjorn3 2020-12-27 10:30:38 +01:00
commit 52cf01c815
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14
compiler/rustc_codegen_cranelift/Readme.md
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@ -2,7 +2,7 @@
> ⚠⚠⚠ Certain kinds of FFI don't work yet. ⚠⚠⚠
The goal of this project is to create an alternative codegen backend for the rust compiler based on [Cranelift](https://github.com/bytecodealliance/wasmtime/blob/master/cranelift).
The goal of this project is to create an alternative codegen backend for the rust compiler based on [Cranelift](https://github.com/bytecodealliance/wasmtime/blob/main/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.
@ -68,7 +68,15 @@ $ $cg_clif_dir/build/cargo.sh jit
or
```bash
$ $cg_clif_dir/build/bin/cg_clif --jit my_crate.rs
$ $cg_clif_dir/build/bin/cg_clif -Cllvm-args=mode=jit -Cprefer-dynamic my_crate.rs
```
There is also an experimental lazy jit mode. In this mode functions are only compiled once they are
first called. It currently does not work with multi-threaded programs. When a not yet compiled
function is called from another thread than the main thread, you will get an ICE.
```bash
$ $cg_clif_dir/build/cargo.sh lazy-jit
```
### Shell
@ -77,7 +85,7 @@ These are a few functions that allow you to easily run rust code from the shell
```bash
function jit_naked() {
echo "$@" | $cg_clif_dir/build/bin/cg_clif - --jit
echo "$@" | $cg_clif_dir/build/bin/cg_clif - -Cllvm-args=mode=jit -Cprefer-dynamic
}
function jit() {