66 lines
1.7 KiB
Markdown
66 lines
1.7 KiB
Markdown
# Usage
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rustc_codegen_cranelift can be used as a near-drop-in replacement for `cargo build` or `cargo run` for existing projects.
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Assuming `$cg_clif_dir` is the directory you cloned this repo into and you followed the instructions (`prepare.sh` and `build.sh` or `test.sh`).
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## Cargo
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In the directory with your project (where you can do the usual `cargo build`), run:
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```bash
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$ $cg_clif_dir/build/cargo.sh build
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```
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This will build your project with rustc_codegen_cranelift instead of the usual LLVM backend.
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## Rustc
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> You should prefer using the Cargo method.
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```bash
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$ $cg_clif_dir/build/bin/cg_clif my_crate.rs
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```
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## Jit mode
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In jit mode cg_clif will immediately execute your code without creating an executable file.
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> This requires all dependencies to be available as dynamic library.
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> The jit mode will probably need cargo integration to make this possible.
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```bash
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$ $cg_clif_dir/build/cargo.sh jit
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```
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or
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```bash
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$ $cg_clif_dir/build/bin/cg_clif -Cllvm-args=mode=jit -Cprefer-dynamic my_crate.rs
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```
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There is also an experimental lazy jit mode. In this mode functions are only compiled once they are
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first called. It currently does not work with multi-threaded programs. When a not yet compiled
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function is called from another thread than the main thread, you will get an ICE.
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```bash
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$ $cg_clif_dir/build/cargo.sh lazy-jit
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```
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## Shell
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These are a few functions that allow you to easily run rust code from the shell using cg_clif as jit.
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```bash
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function jit_naked() {
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echo "$@" | $cg_clif_dir/build/bin/cg_clif - -Cllvm-args=mode=jit -Cprefer-dynamic
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}
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function jit() {
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jit_naked "fn main() { $@ }"
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}
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function jit_calc() {
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jit 'println!("0x{:x}", ' $@ ');';
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}
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```
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