Make the tool_lints actually usable#52851

flip1995 · 2018-07-30T10:08:03Z

Necessary for rust-lang/rust-clippy#2955 and rust-lang/rust-clippy#2977

This PR makes it possible for lint tools (at the moment only for Clippy) to implement the tool_lints, like it was documented in #52018.

Because the declare_lint macro is pretty cluttered right now, there was not really a good way to add the tool_name as an additional argument of the macro. That's why I chose to introduce the new declare_tool_lint macro.

The switch from &str to String in the lint_groups FxHashMap is because I got weird error messages in the check_lint_name method. And the by_name field of the LintStore also uses String.

What comes with this PR:

If this PR lands and Clippy switches to the tool_lints, the currently used methods

#[cfg_attr(feature = "cargo-clippy", allow(clippy_lint))]
#[allow(unknown_lints, clippy_lint)]

to allow/warn/deny/forbid Clippy lints, won't have any effects anymore, but also won't produce a warning. That is because the name of clippy_lint will then be clippy::clippy_lint. (Maybe we can add a clippy lint to search for cfg_attr appearances with the cargo-clippy feature?)

r? @oli-obk

flip1995 · 2018-07-30T10:10:10Z

src/librustc/lint/levels.rs

I'm not sure what to do here... Can we somehow detect if we currently use the clippy_driver or the rustc_driver to find out if the lint does not exist or wasn't even added in the first place?

The driver could register itself as a tool. Not sure where that information belongs, maybe a new field in the Session?

I think tool attributes are required to be checked by the tool. So maybe instead we leave the "unknown lint" error to clippy?

Leaving it to the tool/Clippy was also my idea. We basically need a lint, which looks for allow(clippy::_)/... and checks if the lint exists, I think.

So... I guess just turn the FIXME comment into a comment explaining that

Ok will do. And I will squash these commits while doing this.

oli-obk · 2018-07-30T10:46:10Z

src/librustc/lint/levels.rs

The driver could register itself as a tool. Not sure where that information belongs, maybe a new field in the Session?

oli-obk · 2018-07-30T10:47:08Z

src/librustc/lint/levels.rs

I think tool attributes are required to be checked by the tool. So maybe instead we leave the "unknown lint" error to clippy?

oli-obk · 2018-07-30T10:48:30Z

src/librustc/lint/context.rs

What's the motivation for this change?

In the check_lint_name function I copied the check for lint_groups in the match of the tool_lints:
https://github.com/rust-lang/rust/pull/52851/files#diff-771d6215d1fb5e7f5503514f9895f7bdR341

This lead to the error

error[E0277]: the trait bound `&str: std::borrow::Borrow<std::string::String>` is not satisfied --> librustc/lint/context.rs:341:48 | 341 | None => match self.lint_groups.get(&complete_name) { | ^^^ the trait `std::borrow::Borrow<std::string::String>` is not implemented for `&str`

The weird part was that this error appeared only once and not in both cases. But I can't reproduce this anymore. Switching to String for the FxHashMap keys solved the problem.

While thinking about this a little longer and not at midnight, I found an easier solution...

flip1995 · 2018-07-30T13:37:55Z

I will squash the last 3 commits before merging.

oli-obk

r=me with comment adjusted and fixup commits squashed

oli-obk · 2018-07-30T13:55:31Z

src/librustc/lint/levels.rs

So... I guess just turn the FIXME comment into a comment explaining that

flip1995 · 2018-07-30T15:33:56Z

@bors: r=oli-obk

bors · 2018-07-30T15:33:57Z

@flip1995: 🔑 Insufficient privileges: Not in reviewers

oli-obk · 2018-07-30T15:39:18Z

@bors r+

bors · 2018-07-30T15:39:19Z

📌 Commit 7b9388b has been approved by oli-obk

@oli-obk

Make the tool_lints actually usable cc rust-lang#44690 Necessary for rust-lang/rust-clippy#2955 and rust-lang/rust-clippy#2977 This PR makes it possible for lint tools (at the moment only for Clippy) to implement the `tool_lints`, like it was documented in rust-lang#52018. Because the `declare_lint` macro is pretty cluttered right now, there was not really a good way to add the `tool_name` as an additional argument of the macro. That's why I chose to introduce the new `declare_tool_lint` macro. The switch from `&str` to `String` in the `lint_groups` `FxHashMap` is because I got weird error messages in the `check_lint_name` method. And the `by_name` field of the `LintStore` also uses `String`. ### What comes with this PR: If this PR lands and Clippy switches to the `tool_lints`, the currently used methods ```rust #[cfg_attr(feature = "cargo-clippy", allow(clippy_lint))] #[allow(unknown_lints, clippy_lint)] ``` to `allow`/`warn`/`deny`/`forbid` Clippy lints, won't have any effects anymore, but also won't produce a warning. That is because the name of `clippy_lint` will then be `clippy::clippy_lint`. (Maybe we can add a clippy lint to search for `cfg_attr` appearances with the `cargo-clippy` feature?) r? @oli-obk

@ghost

Rollup of 31 pull requests Successful merges: - #52332 (dead-code lint: say "constructed" for structs) - #52340 (Document From trait implementations for OsStr, OsString, CString, and CStr) - #52628 (Cleanup some rustdoc code) - #52732 (Remove unstable and deprecated APIs) - #52745 (Update clippy to latest master) - #52756 (rustc: Disallow machine applicability in foreign macros) - #52771 (Clarify thread::park semantics) - #52810 ([NLL] Don't make "fake" match variables mutable) - #52821 (pretty print for std::collections::vecdeque) - #52822 (Fix From<LocalWaker>) - #52824 (Fix -Wpessimizing-move warnings in rustllvm/PassWrapper) - #52831 (remove references to AUTHORS.txt file) - #52835 (Fix Alias intra doc ICE) - #52842 (update comment) - #52846 (Add timeout to use of `curl` in bootstrap.py.) - #52851 (Make the tool_lints actually usable) - #52853 (Improve bootstrap help on stages) - #52859 (Use Vec::extend in SmallVec::extend when applicable) - #52861 (Add targets for HermitCore (https://hermitcore.org) to the Rust compiler and port libstd to it.) - #52867 (releases.md: fix 2 typos) - #52870 (Implement Unpin for FutureObj and LocalFutureObj) - #52876 (run-pass/const-endianness: negate before to_le()) - #52878 (Fix wrong issue number in the test name) - #52883 (Include lifetime in mutability suggestion in NLL messages) - #52904 (NLL: sort diagnostics by span) - #52905 (Fix a typo in unsize.rs) - #52907 (NLL: On "cannot move out of type" error, print original before rewrite) - #52908 (Use SetLenOnDrop in Vec::truncate()) - #52914 (Only run the sparc-abi test on sparc) - #52918 (Backport 1.27.2 release notes) - #52929 (Update compatibility note for 1.28.0 to be correct) Failed merges: - #52758 (Cleanup for librustc::session) - #52799 (Use BitVector for global sets of AttrId) r? @ghost

@oli-obk

Make the tool_lints actually usable cc rust-lang#44690 Necessary for rust-lang/rust-clippy#2955 and rust-lang/rust-clippy#2977 This PR makes it possible for lint tools (at the moment only for Clippy) to implement the `tool_lints`, like it was documented in rust-lang#52018. Because the `declare_lint` macro is pretty cluttered right now, there was not really a good way to add the `tool_name` as an additional argument of the macro. That's why I chose to introduce the new `declare_tool_lint` macro. The switch from `&str` to `String` in the `lint_groups` `FxHashMap` is because I got weird error messages in the `check_lint_name` method. And the `by_name` field of the `LintStore` also uses `String`. ### What comes with this PR: If this PR lands and Clippy switches to the `tool_lints`, the currently used methods ```rust #[cfg_attr(feature = "cargo-clippy", allow(clippy_lint))] #[allow(unknown_lints, clippy_lint)] ``` to `allow`/`warn`/`deny`/`forbid` Clippy lints, won't have any effects anymore, but also won't produce a warning. That is because the name of `clippy_lint` will then be `clippy::clippy_lint`. (Maybe we can add a clippy lint to search for `cfg_attr` appearances with the `cargo-clippy` feature?) r? @oli-obk

@ghost

Rollup of 30 pull requests Successful merges: - #52340 (Document From trait implementations for OsStr, OsString, CString, and CStr) - #52628 (Cleanup some rustdoc code) - #52732 (Remove unstable and deprecated APIs) - #52745 (Update clippy to latest master) - #52771 (Clarify thread::park semantics) - #52778 (Improve readability of serialize.rs) - #52810 ([NLL] Don't make "fake" match variables mutable) - #52821 (pretty print for std::collections::vecdeque) - #52822 (Fix From<LocalWaker>) - #52824 (Fix -Wpessimizing-move warnings in rustllvm/PassWrapper) - #52825 (Make sure #47772 does not regress) - #52831 (remove references to AUTHORS.txt file) - #52842 (update comment) - #52846 (Add timeout to use of `curl` in bootstrap.py.) - #52851 (Make the tool_lints actually usable) - #52853 (Improve bootstrap help on stages) - #52859 (Use Vec::extend in SmallVec::extend when applicable) - #52861 (Add targets for HermitCore (https://hermitcore.org) to the Rust compiler and port libstd to it.) - #52867 (releases.md: fix 2 typos) - #52870 (Implement Unpin for FutureObj and LocalFutureObj) - #52876 (run-pass/const-endianness: negate before to_le()) - #52878 (Fix wrong issue number in the test name) - #52883 (Include lifetime in mutability suggestion in NLL messages) - #52888 (Use suggestions for shell format arguments) - #52904 (NLL: sort diagnostics by span) - #52905 (Fix a typo in unsize.rs) - #52907 (NLL: On "cannot move out of type" error, print original before rewrite) - #52914 (Only run the sparc-abi test on sparc) - #52918 (Backport 1.27.2 release notes) - #52929 (Update compatibility note for 1.28.0 to be correct) Failed merges: r? @ghost

Introduce the declare_tool_lint macro

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rust-highfive assigned oli-obk Jul 30, 2018

rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Jul 30, 2018

flip1995 commented Jul 30, 2018

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flip1995 mentioned this pull request Jul 30, 2018

Implement tool_lints rust-lang/rust-clippy#2977

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oli-obk reviewed Jul 30, 2018

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oli-obk approved these changes Jul 30, 2018

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src/librustc/lint/levels.rs Outdated

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So... I guess just turn the FIXME comment into a comment explaining that

flip1995 added 3 commits July 30, 2018 16:10

Check if the lint_name is from a tool and if the tool_lint exists

57c7742

Add a test for the declare_tool_lint macro

d4ff949

Explain that the tool is responsible for unknown tool_lints

7b9388b

flip1995 force-pushed the tool_lints branch from a7f7e88 to 7b9388b Compare July 30, 2018 14:12

bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jul 30, 2018

Mark-Simulacrum mentioned this pull request Jul 31, 2018

Rollup of 21 pull requests #52902

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Mark-Simulacrum mentioned this pull request Aug 1, 2018

Rollup of 31 pull requests #52931

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emilyalbini mentioned this pull request Aug 1, 2018

Rollup of 30 pull requests #52937

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bors merged commit 7b9388b into rust-lang:master Aug 1, 2018

flip1995 deleted the tool_lints branch August 1, 2018 11:02

jyn514 mentioned this pull request Mar 22, 2025

Tracking issue: RFC 2103 - attributes for tools #44690

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flip1995 commented Jul 30, 2018

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