*Update on the Mu computer's memory-safe language*

Progress has been slow over the holiday season because I've been working on a paper about Mu for 2020.programming-conference.or

But functions can now return outputs.

```
fn foo a: int -> result/eax: int {
result <- copy a
increment result
}
```

Project page: github.com/akkartik/mu#readme

Sources for the memory-safe language, now at 5kLoC: akkartik.github.io/mu/html/app

Caveats: no checking yet, only int types supported.

*Update on the Mu computer's memory-safe language*

Still no type-checking or memory-safety, but we can now write any programs with int variables.

There's still no 'var' keyword, so we can't define local variables yet. But that's not insurmountable; just pass in extra arguments for any space you want on the stack 😀

```
result <- factorial n 0 0 0
```

Show thread
Follow

*Update on the Mu computer's memory-safe language*

Basic language is done! Here's factorial. (Compare mastodon.social/@akkartik/1027.)

Still todo:
- user-defined types
- type checking and memory-safety

In other words, I'm about a third of the way there 😂 More detailed todo list: lobste.rs/s/pv8jpr/what_are_yo

(More details on the Mu project: akkartik.name/post/mu-2019-1. Repo: github.com/akkartik/mu)

I should probably highlight register names. Here's an updated screenshot.

(Yes, in Mu you manually allocate registers. Mu will eventually check your allocation.)

Show thread

I just wrote up a cheatsheet of all the instructions supported by Mu (best on a wide screen/window):

raw.githubusercontent.com/akka

It's not clean. Mu isn't a clean, well-designed language. Because it's designed to map 1:1 with x86, and x86 is not a clean, well-designed instruction set.

But this sort of 1-page summary of a compiler is something I've always wished I had. Something that doesn't tell you what to type out and then pretend you understand compilers (compilers.iecc.com/crenshaw/tu)

Show thread

A brief timeline of the Mu computing stack

Jul 6, 2014: commit 0, tree-based interpreter for a statement-oriented language (github.com/akkartik/mu)

Jul 19, 2017: commit 3930, start of SubX machine code (akkartik.name/post/mu-2019-1)

Sep 20, 2018: started building SubX in SubX (mastodon.social/@akkartik/1007)

Jul 24, 2019: SubX in SubX done, commit 5461 (mastodon.social/@akkartik/1024)

Oct 2, 2019: started designing the Mu memory-safe language (akkartik.name/post/mu-2019-2)

Oct 29: started akkartik.github.io/mu/html/app

Show thread

I'll be in Porto, Portugal on Mar 24 to present a paper on Mu at the Convivial Computing Salon: 2020.programming-conference.or

Hoping for some great conversation and disagreements.

Show thread

*Update on the Mu computer's memory-safe language*

Mu just got its first couple of non-integer types: addresses and arrays. As a result, the factorial app can _finally_ run its tests based on command-line args.

akkartik.github.io/mu/html/app

Addresses are accessed using a '*' operator. Arrays are accessed using an 'index' instruction that takes an address (addr array T) and returns an address (addr T).

Literal indexes aren't supported yet.

Open q: indexing arrays of non-power-of-2 element sizes.

Show thread

"I'd like Mu to be a stack a single person can hold in their head all at once, and modify in radical ways." — @akkartik akkartik.name/post/mu-2019-1

@akkartik wow, the whole list of accepted papers looks so cool!

@akkartik Looks like a stimulating conference; wish the travel fit with my plans.

@abecedarius Indeed! I'd have loved to meet you. Hope it happens some other way.

@akkartik This is one of the coolest looking conferences I've seen. Do you know if the talks will be recorded and/or if there will actually be PDFs for the "Accepted Papers"? 👀

@kingcons What I'm hearing is that there won't be recordings 😔

But there _will_ be proceedings published around June or July. And I'll certainly be independently posting the final version of my paper on or before the day of the conference.

Sign in to participate in the conversation
Mastodon

Server run by the main developers of the project 🐘 It is not focused on any particular niche interest - everyone is welcome as long as you follow our code of conduct!