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# RJIT: Ruby JIT
This document has some tips that might be useful when you work on RJIT.
## Project purpose
This project is for experimental purposes.
For production deployment, consider using YJIT instead.
## Supported platforms
The following platforms are assumed to work. `linux-x86_64` is tested on CI.
* OS: Linux, macOS, BSD
* Arch: x86\_64
## configure
### --enable-rjit
On supported platforms, `--enable-rjit` is set by default. You usually don't need to specify this.
You may still manually pass `--enable-rjit` to try RJIT on unsupported platforms.
### --enable-rjit=dev
It enables `--rjit-dump-disasm` if libcapstone is available.
## make
### rjit-bindgen
If you see an "RJIT bindgen" GitHub Actions failure, please commit the `git diff` shown on the failed job.
For doing the same thing locally, run `make rjit-bindgen` after installing libclang.
macOS seems to have libclang by default. On Ubuntu, you can install it with `apt install libclang1`.
## ruby
### --rjit-stats
This prints RJIT stats at exit.
### --rjit-dump-disasm
This dumps all JIT code. You need to install libcapstone before configure and use `--enable-rjit=dev` on configure.
* Ubuntu: `sudo apt-get install -y libcapstone-dev`
* macOS: `brew install capstone`
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