Post by @hipsterelectron@circumstances.run

@hipsterelectron@circumstances.run 35 min. ago

loved this https://bun.com/blog/bun-in-rust

mixing GC with manually-managed memory is an uncommon enough thing for software to need that no language really designs for it.

actually every environment with a gc necessarily does this. maybe try acting like you're building a whole programming language environment for once

One common way to reduce this class of issue is to ensure cleanup code is always run exactly once for code that needs it. Zig is designed to be a simple language with no hidden control flow, and so it prefers the explicit defer keyword to run code at the end of a scope over C++'s implicit ~Destructor or Rust's implicit Drop.

ensuring cleanup is run exactly once is easier when it's explicit

A large percentage of bugs from that list are use-after-free, double-free, and "forgot to free" in an error path. In safe Rust, these are compiler errors and RAII-like automatic cleanup with Drop.

you do know any usage of GC requires unsafe right

Homegrown smart pointers offer worse ergonomics than Rust, with none of the guarantees.

this is flatly incorrect

A year of zero user-facing impact is not a realistic option we could consider.

then don't make a programming language. you're not ready for it

An incremental rewrite adds temporary code that you hope gets deleted eventually, and would be painful in the short-medium term.

if you can't do an incremental rewrite, your abstractions are not strong enough. we rewrote the build system twitter inc used for all its code without user-facing impact. do better

The next question: how do you add Rust lifetimes to code that manually manages memory?

you have to use unsafe. the same way you do in every other language. rust lifetimes only work for code that acts like C++. for everything else you have wrapper functions using unsafe. just like everywhere else.

The trickiest class of error was cyclical dependencies.

if only cargo supported dependency inference like we did in pants. too bad google killed us for using rust to do better than them

To maximize parallelism, the workflow looped

not how you maximize parallelism actually

This is the bleeding edge of what's possible today.

you should not be bleeding from writing a programming language. people do that all the time

Anyone who understands the original Zig code understands the mechanically translated Rust code.

so that makes zero, since even you didn't understand the zig code you shitted out

This Rust rewrite would've taken a team of engineers with full-context on the codebase a year of work.

did claude tell you that too

Rewriting Bun in Rust | Bun BlogMay 4, 7am–8am PDT — 6 commits, +89,278 linesMay 4, 8am–9am PDT — 2 commits, +50,742 linesMay 4, 9am–10am PDT — 1 commit, +28,149 linesMay 4, 11am–12pm PDT — 1 commit, +39,752 linesMay 4, 12pm–1pm PDT — 3 commits, +251,616 linesMay 4, 1pm–2pm PDT — 2 commits, +161,724 linesMay 4, 3pm–4pm PDT — 3 commits, +136,381 linesMay 4, 5pm–6pm PDT — 5 commits, +895 linesMay 4, 6pm–7pm PDT — 5 commits, +17,027 linesMay 4, 7pm–8pm PDT — 1 commit, +106 linesMay 4, 9pm–10pm PDT — 13 commits, +11,661 linesMay 4, 11pm–12am PDT — 6 commits, +8,516 linesMay 5, 12am–1am PDT — 9 commits, +1,381 linesMay 5, 1am–2am PDT — 7 commits, +1,577 linesMay 5, 2am–3am PDT — 4 commits, +2,035 linesMay 5, 3am–4am PDT — 4 commits, +7,808 linesMay 5, 4am–5am PDT — 1 commit, +2,796 linesMay 5, 5am–6am PDT — 2 commits, +29,370 linesMay 5, 8am–9am PDT — 2 commits, +7,076 linesMay 5, 9am–10am PDT — 2 commits, +308 linesMay 5, 11am–12pm PDT — 2 commits, +1,643 linesMay 5, 12pm–1pm PDT — 4 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passedbuild #53952: all shards passedbuild #53973: no failures (partial run)build #53983: shard failuresbuild #53992: shard failuresbuild #53999: shard failuresbuild #54002: no failures (partial run)build #54004: no failures (partial run)build #54007: shard failuresbuild #54008: no failures (partial run)build #54012: all shards passedbuild #54015: all shards passedbuild #54017: all shards passedbuild #54022: shard failuresbuild #54026: all shards passedbuild #54030: all shards passedbuild #54033: all shards passedbuild #54040: all shards passedbuild #54047: shard failuresbuild #54049: shard failuresbuild #54055: shard failuresbuild #54057: shard failuresbuild #54064: all shards passedbuild #54074: all shards passedbuild #54083: all shards passedbuild #54093: all shards passedbuild #54144: shard failuresbuild #54161: shard failuresbuild #54186: shard failuresbuild #54189: shard failuresbuild #54196: shard failuresbuild #54202: all shards passedbuild #53090: shard failuresbuild #53095: shard failuresbuild #53106: shard failuresbuild #53109: shard failuresbuild #53123: shard failuresbuild #53127: shard failuresbuild #53130: shard failuresbuild #53131: shard failuresbuild #53134: shard failuresbuild #53135: shard failuresbuild #53149: shard failuresbuild #53159: shard failuresbuild #53164: shard failuresbuild #53167: shard failuresbuild #53172: shard failuresbuild #53176: shard failuresbuild #53188: shard failuresbuild #53194: shard failuresbuild #53208: shard failuresbuild #53212: shard failuresbuild #53213: shard failuresbuild #53214: shard failuresbuild #53216: shard failuresbuild #53222: shard failuresbuild #53229: shard failuresbuild #53236: no failures (partial run)build #53241: shard failuresbuild #53260: shard failuresbuild #53265: shard failuresbuild #53271: shard failuresbuild #53304: shard failuresbuild #53327: all shards passedbuild #53340: all shards passedbuild #53360: no failures (partial run)build #53419: no failures (partial run)build #53431: shard failuresbuild #53458: no failures (partial run)build #53485: shard failuresbuild #53491: no failures (partial run)build #53503: no failures (partial run)build #53599: shard failuresbuild #53748: shard failuresbuild #53753: shard failuresbuild #53757: shard failuresbuild #53759: shard failuresbuild #53762: shard failuresbuild #53787: shard failuresbuild #53808: shard failuresbuild #53811: shard failuresbuild #53852: shard failuresbuild #53863: shard failuresbuild #53883: shard failuresbuild #53893: shard failuresbuild #53914: no failures (partial run)build #53933: all shards passedbuild #53952: all shards passedbuild #53983: shard failuresbuild #53992: shard failuresbuild #53999: shard failuresbuild #54007: no failures (partial run)build #54012: all shards passedbuild #54015: all shards passedbuild #54017: all shards passedbuild #54022: shard failuresbuild #54026: all shards passedbuild #54030: no failures (partial run)build #54033: all shards passedbuild #54040: all shards passedbuild #54047: shard failuresbuild #54049: shard failuresbuild #54055: no failures (partial run)build #54057: shard failuresbuild #54064: all shards passedbuild #54074: all shards passedbuild #54083: no failures (partial run)build #54093: all shards passedbuild #54144: shard failuresbuild #54161: shard failuresbuild #54186: shard failuresbuild #54189: shard failuresbuild #54196: shard failuresbuild #54202: all shards passed

Why & how we rewrote Bun from Zig to Rust