Befunge interpreter in Rust

Boxfunge (oxidized Befunge) is an experimental interpreter and JIT compiler for the esoteric Befunge programming language. Befunge is one of the most well-known esoteric programming languages and intended to be hard to compile. This implementation has a basic, but very fast interpreter as its core. Currently, a very complicated program, such as the self-interpreter included in this repo, can run at roughly 5ns per Befunge command (200 million steps per second) in release mode. There is also a just-in-time compiler.

Boxfunge supports standard Befunge-93, the original variant. However, it is planned to remove the 80x25 grid restriction via a command-line flag, which would allow the language to be Turing-complete. Support for Befunge-98 (a generalized extension with many advanced features like concurrency) may be added at some point.

To try out the interpreter, this repo contains a collection of programs that are also used for testing the interpreter's functionality. They are mostly taken from the Esolangs wiki.

$ cargo build
$ cargo run -- arguments...
$ cargo test

Usage: boxfunge <input> [-p] [-j] [-s <language-standard>] [-i <stdin>]

Befunge-93 interpreter.

Positional Arguments:
  input             input file to read

Options:
  -p, --show-performance
                    collect and show performance metrics
  -j, --use-jit     use the experimental just-in-time compiler
  -s, --language-standard
                    language standard to use, for future compatibility. default:
                    98
  -i, --stdin       file to use as stdin for the program; particularly useful
                    with self-interpreters
  --help            display usage information