What?

A silly demo to run FizzBuzz. It invents a dumb, imperative, untyped, basic looking language and implements the standard FizzBuzz test in it. Then it parses and JIT compiles the source, finally running it in place.

It's a very basic implementation, doing the absolute bare minimum to get the FizzBuzz going. The print function, which is the only library function available, is pretty hacky. It calls libc puts() for strings and has its own little method for printing integers, which in turn must be postive and must not exceed 999. 😁

It has a for-loop, but the iterator range must be specified as immediates. As I said, whatever I needed for FizzBuzz.

Why?

I've read all about JIT compilers in theory, but never implemented an interpreter or compiler using one.

This is also a talking piece for whenever I'm looking for Rust/compiler work.

How?

There are a bunch of tests in the tests/ directory, most importantly the fizzbuzz.test file.

From the root directory:

cargo run -- fizzbuzz.script

  1
  2
Fizz
  4
Buzz
Fizz
  7
  8
Fizz
Buzz
 11
Fizz
 13
 14
FizzBuzz
 16
 17
.
.
.