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bors bd36e69d25 Auto merge of #133566 - lcnr:fast-reject-perf, r=compiler-errors 
fast-reject: add cache

slightly modified version of #133524

I tried a few alternatives:
- simply bail after recursion for a certain amount of times, however, looking at the number of steps taken while compiling different crates we get the following results[^1]:
- add a cache: results in a bigger performance impact

typenum
```rust
1098842 counts
(  1)   670511 (61.0%, 61.0%): dropping after 1
(  2)   358785 (32.7%, 93.7%): dropping after 0
(  3)    25191 ( 2.3%, 96.0%): dropping after 2
(  4)    10912 ( 1.0%, 97.0%): dropping after 4
(  5)     6461 ( 0.6%, 97.5%): dropping after 3
(  6)     5239 ( 0.5%, 98.0%): dropping after 5
(  7)     2528 ( 0.2%, 98.3%): dropping after 8
(  8)     2188 ( 0.2%, 98.5%): dropping after 1094
(  9)     2097 ( 0.2%, 98.6%): dropping after 6
( 10)     1179 ( 0.1%, 98.7%): dropping after 34
( 11)     1148 ( 0.1%, 98.9%): dropping after 7
( 12)      822 ( 0.1%, 98.9%): dropping after 10
```
bitmaps
```rust
533346 counts
(  1)   526166 (98.7%, 98.7%): dropping after 1
(  2)     4562 ( 0.9%, 99.5%): dropping after 0
(  3)     2072 ( 0.4%, 99.9%): dropping after 1024
(  4)      305 ( 0.1%,100.0%): dropping after 2
(  5)      106 ( 0.0%,100.0%): dropping after 4
(  6)       30 ( 0.0%,100.0%): dropping after 8
(  7)       18 ( 0.0%,100.0%): dropping after 3
(  8)       17 ( 0.0%,100.0%): dropping after 44
(  9)       15 ( 0.0%,100.0%): dropping after 168
( 10)        8 ( 0.0%,100.0%): dropping after 14
( 11)        7 ( 0.0%,100.0%): dropping after 13
( 12)        7 ( 0.0%,100.0%): dropping after 24
```
stage 2 compiler is mostly trivial, but has a few cases where we get >5000
```rust
12987156 counts
(  1)  9280476 (71.5%, 71.5%): dropping after 0
(  2)  2277841 (17.5%, 89.0%): dropping after 1
(  3)   724888 ( 5.6%, 94.6%): dropping after 2
(  4)   204005 ( 1.6%, 96.2%): dropping after 4
(  5)   146537 ( 1.1%, 97.3%): dropping after 3
(  6)    64287 ( 0.5%, 97.8%): dropping after 5
(  7)    43938 ( 0.3%, 98.1%): dropping after 6
(  8)    43758 ( 0.3%, 98.4%): dropping after 8
(  9)    27220 ( 0.2%, 98.7%): dropping after 7
( 10)    17374 ( 0.1%, 98.8%): dropping after 9
( 11)    16015 ( 0.1%, 98.9%): dropping after 10
( 12)    12855 ( 0.1%, 99.0%): dropping after 12
( 13)    10494 ( 0.1%, 99.1%): dropping after 11
( 14)     7553 ( 0.1%, 99.2%): dropping after 14
```

[^1]: i've incremented a counter in the place I now decrement the depth at and then printed it on drop

r? `@compiler-errors`
2024-12-02 09:19:20 +00:00
.github Rollup merge of #132605 - Kobzol:ci-increase-timeout, r=Mark-Simulacrum 2024-11-26 20:35:37 -05:00
compiler Auto merge of #133566 - lcnr:fast-reject-perf, r=compiler-errors 2024-12-02 09:19:20 +00:00
library Rollup merge of #133711 - cod10129:master, r=Noratrieb 2024-12-01 21:38:25 -05:00
LICENSES Synchronize Unicode license text from unicode.org 2024-11-20 00:54:12 -08:00
src Rollup merge of #133712 - RalfJung:rust_analyzer_settings, r=jieyouxu 2024-12-01 21:38:26 -05:00
tests Rollup merge of #133446 - Zalathar:querify, r=cjgillot 2024-12-01 21:38:25 -05:00
.clang-format Add .clang-format 2024-06-26 05:56:00 +08:00
.editorconfig Only use max_line_length = 100 for *.rs 2023-07-10 15:18:36 -07:00
.git-blame-ignore-revs Add rustfmt 2024 reformatting to git blame ignore 2024-09-23 10:02:04 +02:00
.gitattributes Rename config.toml.example to config.example.toml 2023-03-11 14:10:00 -08:00
.gitignore ignore /build instead of build/ in gitignore 2024-11-28 21:52:23 +01:00
.gitmodules Update to LLVM 19.1.0 2024-09-20 14:41:36 -07:00
.ignore Add .ignore file to make config.toml searchable in vscode 2024-06-24 10:15:16 +02:00
.mailmap Add a bunch of mailmap entries 2024-11-01 20:10:36 +01:00
Cargo.lock Rollup merge of #133569 - paolobarbolini:ruzstd-0.7.3, r=Mark-Simulacrum 2024-11-30 12:56:52 +08:00
Cargo.toml Bump Clippy version -> 0.1.85 2024-11-28 18:57:52 +01:00
CODE_OF_CONDUCT.md Remove the code of conduct; instead link https://www.rust-lang.org/conduct.html 2019-10-05 22:55:19 +02:00
config.example.toml Rollup merge of #132502 - Voultapher:document-core-features-in-config-toml-example, r=Mark-Simulacrum 2024-11-25 07:01:38 +01:00
configure Ensure ./configure works when configure.py path contains spaces 2024-02-16 18:57:22 +00:00
CONTRIBUTING.md fix: Update CONTRIBUTING.md recommend -> recommended 2023-11-16 23:57:09 +05:30
COPYRIGHT Synchronize Unicode license text from unicode.org 2024-11-20 00:54:12 -08:00
INSTALL.md add clarity for custom path installation 2024-10-06 07:37:00 -05:00
LICENSE-APACHE Remove appendix from LICENCE-APACHE 2019-12-30 14:25:53 +00:00
license-metadata.json collect-license-metadata: move JSON to root, and add a 'check' mode 2024-11-25 14:14:57 +00:00
LICENSE-MIT LICENSE-MIT: Remove inaccurate (misattributed) copyright notice 2017-07-26 16:51:58 -07:00
README.md Add new lint doc_include_without_cfg 2024-11-21 22:43:55 +01:00
RELEASES.md fix typo in RELEASES.md 2024-11-28 23:06:15 +08:00
REUSE.toml collect-license-metadata: move JSON to root, and add a 'check' mode 2024-11-25 14:14:57 +00:00
rust-bors.toml Increase timeout for new bors bot 2024-03-13 08:31:07 +01:00
rustfmt.toml chore(style): sync submodule exclusion list between tidy and rustfmt 2024-11-02 16:43:10 +03:00
triagebot.toml remove "onur-ozkan" from users_on_vacation 2024-11-25 16:19:21 +03:00
x fix(x): fix a regex used to find python executable 2024-11-06 16:40:02 +03:00
x.ps1 use & instead of start-process in x.ps1 2023-12-09 09:46:16 -05:00
x.py Fix recent python linting errors 2023-08-02 04:40:28 -04:00

README.md

This is the main source code repository for Rust. It contains the compiler, standard library, and documentation.

Why Rust?

  • Performance: Fast and memory-efficient, suitable for critical services, embedded devices, and easily integrate with other languages.

  • Reliability: Our rich type system and ownership model ensure memory and thread safety, reducing bugs at compile-time.

  • Productivity: Comprehensive documentation, a compiler committed to providing great diagnostics, and advanced tooling including package manager and build tool (Cargo), auto-formatter (rustfmt), linter (Clippy) and editor support (rust-analyzer).

Quick Start

Read "Installation" from The Book.

Installing from Source

If you really want to install from source (though this is not recommended), see INSTALL.md.

Getting Help

See https://www.rust-lang.org/community for a list of chat platforms and forums.

Contributing

See CONTRIBUTING.md.

License

Rust is primarily distributed under the terms of both the MIT license and the Apache License (Version 2.0), with portions covered by various BSD-like licenses.

See LICENSE-APACHE, LICENSE-MIT, and COPYRIGHT for details.

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The Rust Foundation owns and protects the Rust and Cargo trademarks and logos (the "Rust Trademarks").

If you want to use these names or brands, please read the media guide.

Third-party logos may be subject to third-party copyrights and trademarks. See Licenses for details.