BJIT

Introduction

I recently had an empty day, with the only plans being relaxation. I quickly got bored. So I decided to do the next best thing. Write a JIT compiler targeting ARM64. I was able to get it into a working state in around ~24 hours. There might be some bugs, but I plan to clean this up later.

Features

✔️ ARM64 JIT, for maximum performance

✔️ Support user input via ',' syntax

✔️ Optimize compiled instructions

✔️ Compile Brainfuck -> ELF

🚧 Support other architectures

Usage

Getting Started

git clone https://github.com/mateocabanal/bjit
cd bjit
cmake -B build
cd build
cmake --build .
./bjit ../bf_tests/hello.bf

Help Menu

bjit -h

Compile BF to ARM64 ELF

bjit -c <output file> <input file>

JIT Status

This project might not fit the true definition of a Just-in-Time Compiler. The code reads a BF file character by character, than compiles the program and executes the resulting instructions. I think this might make BJIT fall under the category of a AOT (Ahead-Of-Time) Compiler.

How does this JIT work?

My Blog Post