3 rustc_codegen_cranelift can be used as a near-drop-in replacement for `cargo build` or `cargo run` for existing projects.
5 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`).
9 In the directory with your project (where you can do the usual `cargo build`), run:
12 $ $cg_clif_dir/build/cargo build
15 This will build your project with rustc_codegen_cranelift instead of the usual LLVM backend.
19 > You should prefer using the Cargo method.
22 $ $cg_clif_dir/build/bin/cg_clif my_crate.rs
27 In jit mode cg_clif will immediately execute your code without creating an executable file.
29 > This requires all dependencies to be available as dynamic library.
30 > The jit mode will probably need cargo integration to make this possible.
33 $ $cg_clif_dir/build/cargo jit
39 $ $cg_clif_dir/build/bin/cg_clif -Cllvm-args=mode=jit -Cprefer-dynamic my_crate.rs
42 There is also an experimental lazy jit mode. In this mode functions are only compiled once they are
46 $ $cg_clif_dir/build/cargo lazy-jit
51 These are a few functions that allow you to easily run rust code from the shell using cg_clif as jit.
54 function jit_naked() {
55 echo "$@" | $cg_clif_dir/build/bin/cg_clif - -Cllvm-args=mode=jit -Cprefer-dynamic
59 jit_naked "fn main() { $@ }"
63 jit 'println!("0x{:x}", ' $@ ');';