Status update on self-hosting my new Assembly syntax

All example apps now translating correctly, and the result is bit-for-bit identical with the results of the C++ translator.

The last remaining step, the final frontier: SubX-in-SubX in SubX-in-SubX. Translating the self-hosted translator using the self-hosted translator. Still seeing some discrepancies there.

I fixed just one bug since yesterday, but had to cope with a 4.4GB trace for it.

https://github.com/akkartik/mu/blob/70a0776031ff/subx/Readme.md

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Status update on self-hosting my new Assembly syntax

Standard library is now self-hosted!

apps/factorial is also translating successfully, and the binary is the exact same size as before. However there are diffs to track down.

I'm ignoring emulated mode for now, and am testing ELF binaries natively. 5k lines of input take 26 seconds to translate. The cost: having to slum it with some light debug by print action in the absence of time-travel debugging.

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Status update on self-hosting my new Assembly syntax

Test harness done. The self-hosted translator now handles all 12 example programs. A beach-head for reproducible builds.

Time to start translating the standard library. In emulated mode things get slow fast:

$ time ./translate 049*.subx 05[0-n]*.subx
35 lines in 9s
84 lines in 20s
219 lines in 59s
262 lines in 68s
382 lines in ... ERROR

In native mode, translating 262 lines takes 0.1s.

https://github.com/akkartik/mu/blob/90538f232a/subx/Readme.md

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Status update on self-hosting my new Assembly syntax

Another day, another bug fixed, another example program working.

But now I've hit a missing feature: code-generating the special run-tests function, which just calls all functions starting with 'test-'. Pretty much all remaining programs are now bottlenecked on this.

Next few tasks:

• run-tests
• '\n' in string literals
• it's dog slow. Probably the linear search. But no profiling yet.

https://github.com/akkartik/mu/blob/3af52436dfa/subx/Readme.md#roadmap-and-status

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Status update on self-hosting my new Assembly syntax

2 bugfixes later, 10/12 example programs building correctly.

There's one known hole in my implementation: it doesn't support '\n' in string literals. Now may be the time to plug this gap.

https://github.com/akkartik/mu/blob/5030d67c85/subx/Readme.md

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Status update on self-hosting my new Assembly syntax

First example program successfully translated!

4 programs now translating:

✓ ex1
✓ ex2
  ex3
✓ ex4
  ex5
  ex6
✓ ex7
  ex8
  ex9
...

Sample run:

$ cat examples/ex1.subx |dquotes |assort |pack |survey |hex > a.elf

https://github.com/akkartik/mu/blob/294a15206329/subx/Readme.md

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Status update on self-hosting my new Assembly syntax

All phases are done and passing tests separately. However I haven't yet managed to actually put the final phase together with the rest to build any actual programs.

Here's what I have so far in the final phase: http://akkartik.github.io/mu/html/subx/apps/survey.subx.html

I've also started working on the next step: a simple list of steps for building a minimal Linux kernel to go with SubX. It's the final dependency.

See more

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Status update on self-hosting my new Assembly syntax

All tests for the fifth and final phase are written, and detailed pseudocode has been sketched out (in classic waterfall fashion). That seems like 90% done. Is this when they say the remaining 90% kicks in? :)

Back on Mar 31 I estimated it would take 3-4 months. That makes the 'deadline' end-June or mid-July. Is this project somehow going to get delivered on schedule, in spite of missing all intermediate deadlines until now?!

Someone's been helping me. Is it possible adding more manpower to the project will help it get delivered on time?!

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My new Assembly syntax is now 4/5ths bootstrapped in itself. Just one phase left: https://github.com/akkartik/mu/pull/34

The previous phase took 7 weeks, but what's a factor of 7 between friends 😄

Some LoC stats (total, and excluding comments/tests):

• hex: 1511/144
• pack: 7348/1054
• assort: 1318/284
• dquotes: 2694/497

Similarly, some executable sizes:

• hex: 22KB/3KB
• pack: 37KB/8KB
• assort: 22KB/5KB
• dquotes: 27KB/6KB

https://github.com/akkartik/mu/blob/6f28e4b66/subx/Readme.md

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I just had an interesting chat with a contributor to SubX, my bootstrapped Assembly syntax. In response:

a) SubX now has sandbox branches where people can reimplement existing features.

b) I'll be publishing in-progress work. In the past wanting to keep HEAD passing tests has caused changes to accumulate for weeks at a time. Now they'll start getting feature branches like https://github.com/akkartik/mu/pull/23

Each PR at https://github.com/akkartik/mu/pulls now has context and instructions.

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