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 (`prepare.sh` and `build.sh` 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.sh 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.sh 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
43 first called. It currently does not work with multi-threaded programs. When a not yet compiled
44 function is called from another thread than the main thread, you will get an ICE.
47 $ $cg_clif_dir/build/cargo.sh lazy-jit
52 These are a few functions that allow you to easily run rust code from the shell using cg_clif as jit.
55 function jit_naked() {
56 echo "$@" | $cg_clif_dir/build/bin/cg_clif - -Cllvm-args=mode=jit -Cprefer-dynamic
60 jit_naked "fn main() { $@ }"
64 jit 'println!("0x{:x}", ' $@ ');';