18b4be59fe
Avoid `GenFuture` shim when compiling async constructs Previously, async constructs would be lowered to "normal" generators, with an additional `from_generator` / `GenFuture` shim in between to convert from `Generator` to `Future`. The compiler will now special-case these generators internally so that async constructs will *directly* implement `Future` without the need to go through the `from_generator` / `GenFuture` shim. The primary motivation for this change was hiding this implementation detail in stack traces and debuginfo, but it can in theory also help the optimizer as there is less abstractions to see through. --- Given this demo code: ```rust pub async fn a(arg: u32) -> Backtrace { let bt = b().await; let _arg = arg; bt } pub async fn b() -> Backtrace { Backtrace::force_capture() } ``` I would get the following with the latest stable compiler (on Windows): ``` 4: async_codegen:🅱️:async_fn$0 at .\src\lib.rs:10 5: core::future::from_generator::impl$1::poll<enum2$<async_codegen:🅱️:async_fn_env$0> > at /rustc/897e37553bba8b42751c67658967889d11ecd120\library\core\src\future\mod.rs:91 6: async_codegen:🅰️:async_fn$0 at .\src\lib.rs:4 7: core::future::from_generator::impl$1::poll<enum2$<async_codegen:🅰️:async_fn_env$0> > at /rustc/897e37553bba8b42751c67658967889d11ecd120\library\core\src\future\mod.rs:91 ``` whereas now I get a much cleaner stack trace: ``` 3: async_codegen:🅱️:async_fn$0 at .\src\lib.rs:10 4: async_codegen:🅰️:async_fn$0 at .\src\lib.rs:4 ``` |
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rustfmt.toml | ||
triagebot.toml |
rust-analyzer is a modular compiler frontend for the Rust language. It is a part of a larger rls-2.0 effort to create excellent IDE support for Rust.
Quick Start
https://rust-analyzer.github.io/manual.html#installation
Documentation
If you want to contribute to rust-analyzer or are just curious about how things work under the hood, check the ./docs/dev folder.
If you want to use rust-analyzer's language server with your editor of choice, check the manual folder. It also contains some tips & tricks to help you be more productive when using rust-analyzer.
Security and Privacy
See the corresponding sections of the manual.
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For usage and troubleshooting requests, please use "IDEs and Editors" category of the Rust forum:
https://users.rust-lang.org/c/ide/14
For questions about development and implementation, join rust-analyzer working group on Zulip:
https://rust-lang.zulipchat.com/#narrow/stream/185405-t-compiler.2Frust-analyzer
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- Website: https://rust-analyzer.github.io/
- Metrics: https://rust-analyzer.github.io/metrics/
- API docs: https://rust-lang.github.io/rust-analyzer/ide/
- Changelog: https://rust-analyzer.github.io/thisweek
License
rust-analyzer is primarily distributed under the terms of both the MIT license and the Apache License (Version 2.0).
See LICENSE-APACHE and LICENSE-MIT for details.