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A generic framework for on-demand, incrementalized computation. Inspired by adapton, glimmer, and rustc's query system.
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Aleksey Kladov 44ca713da1 Make salsa buildable on power 
rust-analyzer fails in rust-lang/rust repo on the power target,
because it doesn't have `AtomicU64`. So, lets just use `AtomicUsize`
as a revision number.

Semantically this is wrong, as we are not using revision to address
arrays, but, practically, it's a nice compromise to build on targets
without AtomicU64 and to have large revision numbers on most relevant
targets.
2020-07-03 16:20:31 +02:00
.github/workflows Check without features on CI 2020-07-01 22:42:14 +02:00
book add RFC 4, 5 2020-06-27 10:25:20 +00:00
components/salsa-macros document the database macro 2020-06-26 22:21:54 +00:00
examples document the database macro 2020-06-26 22:21:54 +00:00
src Make salsa buildable on power 2020-07-03 16:20:31 +02:00
tests make synthetic_write require &mut self (breaking change!) 2019-09-27 05:50:16 -04:00
.dir-locals.el ask emacs to rustfmt on save 2018-09-28 11:26:57 -04:00
.gitignore update travis to test book and publish 2019-01-31 10:33:28 -05:00
Cargo.toml feat: Prune unnecessary dependencies 2020-07-01 22:42:07 +02:00
FAQ.md Update New Mexico state question 2020-06-26 15:48:29 +01:00
LICENSE-APACHE
LICENSE-MIT
README.md Setup GitHub actions 2020-06-25 12:22:03 +02:00
RELEASES.md highlight breaking changes 2019-08-15 08:08:00 -04:00

README.md

salsa

Test Book Released API docs Crates.io

A generic framework for on-demand, incrementalized computation.

Obligatory warning

Very much a WORK IN PROGRESS at this point. Ready for experimental use but expect frequent breaking changes.

Credits

This system is heavily inspired by adapton, glimmer, and rustc's query system. So credit goes to Eduard-Mihai Burtescu, Matthew Hammer, Yehuda Katz, and Michael Woerister.

Key idea

The key idea of salsa is that you define your program as a set of queries. Every query is used like function K -> V that maps from some key of type K to a value of type V. Queries come in two basic varieties:

  • Inputs: the base inputs to your system. You can change these whenever you like.
  • Functions: pure functions (no side effects) that transform your inputs into other values. The results of queries is memoized to avoid recomputing them a lot. When you make changes to the inputs, we'll figure out (fairly intelligently) when we can re-use these memoized values and when we have to recompute them.

Want to learn more?

To learn more about Salsa, try one of the following:

Getting in touch

The bulk of the discussion happens in the issues and pull requests, but we have a zulip chat as well.