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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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bors[bot] 73aba192c1
Merge #295 
295: Make storage fields of #nameGroupStorage private r=nikomatsakis a=mheiber

This change resolves a fixme that referenced #120.

This change breaks no tests, and, if I understand
correctly, does not affect user-facing API.

Here is the difference for the `HelloWorldGroupStorage__` struct
generated from macros in the `hello_world` example:

**Before:**

```rs
struct HelloWorldGroupStorage__ {
    pub input_string:std::sync::Arc<<InputStringQuery as salsa::Query> ::Storage> ,pub length:std::sync::Arc<<LengthQuery as salsa::Query> ::Storage> ,
}
```

**After:**

```rs
struct HelloWorldGroupStorage__ {
    input_string:std::sync::Arc<<InputStringQuery as salsa::Query> ::Storage> ,length:std::sync::Arc<<LengthQuery as salsa::Query> ::Storage> ,
}
```

Co-authored-by: Maxwell Elliot Heiber <mheiber@fb.com>
2022-01-25 19:54:56 +00:00
.github/workflows Update book workflow 2021-09-28 22:03:05 +02:00
book s/maybe_changed_since/maybe_changed_after/ 2021-11-13 16:39:41 -05:00
components/salsa-macros Make storage fields of #nameGroupStorage private 2022-01-23 20:18:25 +00:00
examples Remove ': salsa::Database' bound from two examples 2021-12-30 11:02:30 +00:00
src Merge #288 #289 2022-01-21 18:35:51 +00:00
tests don't recover when not a participant 2021-11-12 05:50:06 -05:00
.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
bors.toml Update book workflow 2021-09-28 22:03:05 +02:00
Cargo.toml Merge #287 2022-01-21 18:33:32 +00:00
FAQ.md Update New Mexico state question 2020-06-26 15:48:29 +01:00
LICENSE-APACHE add readme, license, etc 2018-09-28 11:01:27 -04:00
LICENSE-MIT add readme, license, etc 2018-09-28 11:01:27 -04:00
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.