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1638: Avoid cloning a TtToken in SubtreeTokenSource::mk_token r=matklad a=lnicola

According to `perf record`, this function is the hottest one while running `ra_cli analysis-stats`:

Before:

```
6.05%  ra_cli  ra_cli        <ra_mbe::subtree_source::SubtreeTokenSource as ra_parser::TokenSource>::lookahead_nth
5.56%  ra_cli  ra_cli        <rowan::green::GreenNode as core:#️⃣:Hash>::hash
4.16%  ra_cli  libc-2.29.so  _int_malloc
3.93%  ra_cli  ra_cli        ra_mbe::subtree_source::SubtreeTokenSource::get

Database loaded, 255 roots, 231.676882ms
Crates in this dir: 27
Total modules found: 282
Total declarations: 9642
Total functions: 3287
Total expressions: 64616
Expressions of unknown type: 9111 (14%)
Expressions of partially unknown type: 3417 (5%)
Analysis: 24.012797561s, 0b allocated 0b resident
target/release/ra_cli analysis-stats  24.60s user 0.56s system 100% cpu 25.125 total
```

After:

```
5.85%  ra_cli  ra_cli        <rowan::green::GreenNode as core:#️⃣:Hash>::hash
4.55%  ra_cli  libc-2.29.so  _int_malloc
4.31%  ra_cli  ra_cli        ra_parser::parser::Parser::nth
3.61%  ra_cli  ra_cli        <ra_syntax::parsing::text_token_source::TextTokenSource as ra_parser::TokenSource>::lookahead_nth
3.54%  ra_cli  ra_cli        ra_syntax::syntax_node::SyntaxTreeBuilder::finish_node
3.46%  ra_cli  libc-2.29.so  _int_free
3.12%  ra_cli  libc-2.29.so  malloc
2.76%  ra_cli  ra_cli        ra_parser::event::process
2.68%  ra_cli  ra_cli        alloc::sync::Arc<T>::drop_slow
2.50%  ra_cli  ra_cli        ra_mbe::subtree_source::SubtreeTokenSource::get
2.31%  ra_cli  ra_cli        <smol_str::SmolStr as core:#️⃣:Hash>::hash
2.04%  ra_cli  libc-2.29.so  __memmove_avx_unaligned_erms
1.92%  ra_cli  ra_cli        <ra_mbe::subtree_source::SubtreeTokenSource as ra_parser::TokenSource>::lookahead_nth

Database loaded, 255 roots, 236.176803ms
Crates in this dir: 27
Total modules found: 282
Total declarations: 9642
Total functions: 3287
Total expressions: 64620
Expressions of unknown type: 9107 (14%)
Expressions of partially unknown type: 3425 (5%)
Analysis: 22.562328486s, 0b allocated 0b resident
target/release/ra_cli analysis-stats  23.12s user 0.57s system 100% cpu 23.659 total
```

r? @edwin0cheng, @matklad 

Co-authored-by: Laurențiu Nicola <lnicola@dend.ro>

2019-08-03 20:07:07 +00:00

.cargo

Overhaul installation process

2019-07-27 14:35:18 +03:00

.github

Create FUNDING.yml

2019-07-06 08:33:19 +03:00

.vscode

revert change to "check" since "build" is intentional

2019-03-10 14:57:30 +01:00

crates

Merge #1638

2019-08-03 20:07:07 +00:00

docs

document upgrade process

2019-07-29 12:14:11 +03:00

editors

Merge #1614

2019-07-29 08:55:09 +00:00

.gitattributes

add .gitattributes

2019-04-05 23:31:58 +08:00

.gitignore

Updated the gitignore

2019-04-05 22:06:15 +01:00

.travis.yml

install npm deps once

2019-07-29 11:13:16 +03:00

bors.toml

remove appveyor

2019-04-21 19:26:01 +03:00

Cargo.lock

Update insta to 0.9.0 and cargo update

2019-07-31 10:05:00 -04:00

Cargo.toml

smaller debuginfo in release

2019-07-22 18:30:39 +03:00

LICENSE-APACHE

…

LICENSE-MIT

…

README.md

Fix rls URL.

2019-08-02 15:19:19 +01:00

rustfmt.toml

allow rustfmt to reorder imports

2019-07-04 23:09:09 +03:00

README.md

Rust Analyzer

Rust Analyzer is an experimental 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. If you want to get involved, check the rls-2.0 working group in the compiler-team repository:

https://github.com/rust-lang/compiler-team/tree/master/content/working-groups/rls-2.0

Work on the Rust Analyzer is sponsored by

Mozilla

Language Server Quick Start

Rust Analyzer is a work-in-progress, so you'll have to build it from source, and you might encounter critical bugs. That said, it is complete enough to provide a useful IDE experience and some people use it as a daily driver.

To build rust-analyzer, you need:

latest stable rust for language server itself
latest stable npm and VS Code for VS Code extension (code should be in path)

For setup for other editors, see ./docs/user.

# clone the repo
$ git clone https://github.com/rust-analyzer/rust-analyzer && cd rust-analyzer

# install both the language server and VS Code extension
$ cargo install-ra

# alternatively, install only the server. Binary name is `ra_lsp_server`.
$ cargo install-ra --server

Documentation

If you want to contribute to rust-analyzer or 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 ./docs/user folder. It also contains some tips & tricks to help you be more productive when using rust-analyzer.

Getting in touch

We are on the rust-lang Zulip!

https://rust-lang.zulipchat.com/#narrow/stream/185405-t-compiler.2Frls-2.2E0

Quick Links

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.

Languages

Rust 96.2%

RenderScript 0.7%

JavaScript 0.6%

Shell 0.6%

Fluent 0.4%

Other 1.3%