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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
--enable-rjit=dev makes the interpreter slower, but enables vm_insns_count and ratio_in_rjit
in ruby --rjit-stats to work.
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. Some stats are available only with --enable-rjit=dev on configure.
--rjit-dump-disasm
This dumps all JIT code. You need to install libcapstone before configure.
- Ubuntu:
sudo apt-get install -y libcapstone-dev - macOS:
brew install capstone