celm: Elm compiler written in Elm

celm is an experimental compiler that parses Elm code and generates ARM64 assembly code. celm is written in Elm and developed on Apple Silicon.

How does it work?

Take this Elm expression for example:

module Main exposing (main)
main = 3 + 4 * 3

celm compiles the above code into the following assembly instruction sequence:

    .text
    .globl _main
    .align 2
_main:
    stp x29, x30, [sp, -16]!
    mov x29, sp
    sub sp, sp, 416
    mov x0, 3
    str x0, [sp, -16]!
    mov x0, 4
    ldr x1, [sp], 16
    mul x0, x0, x1
    str x0, [sp, -16]!
    mov x0, 3
    ldr x1, [sp], 16
    add x0, x0, x1
    mov sp, x29
    ldp x29, x30, [sp], 16
    ret

Getting Started

You can get started with the celm experiment by first cloning the necessary repositories.

git clone git@github.com:derbuihan/celm.git
cd celm
npm install

After installing, you can build with the following command:

npm run build

Now, you are ready to write your Elm code, please save it as tmp/tmp.elm. For example, the code can be a single instruction like:

module Main exposing (main)

main = 1

To compile the Elm code to an executable and run it, use the following commands:

npm run compile "tmp/tmp.elm"
clang output/tmp.s -o output/tmp; ./output/tmp; echo $?;

If you want to run tests, execute the following command:

npm run test

Happy Coding!