Make rustc_mir::dataflow module pub (for clippy) #64207
Merged
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
|
r? @cramertj (rust_highfive has picked a reviewer for you, use r? to override) |
rust-highfive
added
the
S-waiting-on-review
|
I think this is fine, but I'd like to double check with either @eddyb, @pnkfelix, or @matthewjasper. What are you using to consume the results? Right now I think |
|
I'm using |
|
@JohnCSimon Waiting for an approval from
|
|
No objections have been voiced so I'm approving this. |
|
📌 Commit 867ce76 has been approved by |
bors
added
S-waiting-on-bors
tmandry
added a commit
to tmandry/rust
that referenced
this pull request
Sep 18, 2019
Make rustc_mir::dataflow module pub (for clippy) I'm working on fixing false-positives of a MIR-based clippy lint (rust-lang/rust-clippy#4509), and in need of the dataflow infrastructure.
bors
added a commit
that referenced
this pull request
Sep 18, 2019
Rollup of 5 pull requests Successful merges: - #64207 (Make rustc_mir::dataflow module pub (for clippy)) - #64348 (PR: documentation spin loop hint) - #64532 (Replace `state_for_location` with `DataflowResultsCursor`) - #64578 (Fix issue22656 with LLDB 8) - #64580 (Update books) Failed merges: r? @ghost
bors
added a commit
to rust-lang/rust-clippy
that referenced
this pull request
Oct 3, 2019
Fix false-positive of redundant_clone and move to clippy::perf This PR introduces dataflow analysis to `redundant_clone` lint to filter out borrowed variables, which had been incorrectly detected. Depends on rust-lang/rust#64207. changelog: Moved `redundant_clone` lint to `perf` group # What this lint catches ## `clone`/`to_owned` ```rust let s = String::new(); let t = s.clone(); ``` ```rust // MIR _1 = String::new(); _2 = &_1; _3 = clone(_2); // (*) ``` We can turn this `clone` call into a move if 1. `_2` is the sole borrow of `_1` at the statement `(*)` 2. `_1` is not used hereafter ## `Deref` + type-specific `to_owned` method ```rust let s = std::path::PathBuf::new(); let t = s.to_path_buf(); ``` ```rust // MIR _1 = PathBuf::new(); _2 = &1; _3 = call deref(_2); _4 = _3; // Copies borrow StorageDead(_2); _5 = Path::to_path_buf(_4); // (*) ``` We can turn this `to_path_buf` call into a move if 1. `_3` `_4` are the sole borrow of `_1` at `(*)` 2. `_1` is not used hereafter # What this PR introduces 1. `MaybeStorageLive` that determines whether a local lives at a particular location 2. `PossibleBorrowerVisitor` that constructs [`TransitiveRelation`](https://doc.rust-lang.org/nightly/nightly-rustc/rustc_data_structures/transitive_relation/struct.TransitiveRelation.html) of possible borrows, e.g. visiting `_2 = &1; _3 = &_2:` will result in `_3 -> _2 -> _1` relation. Then `_3` and `_2` will be counted as possible borrowers of `_1` in the sole-borrow analysis above.
phansch
added a commit
to phansch/rust-clippy
that referenced
this pull request
Oct 4, 2019
Fix false-positive of redundant_clone and move to clippy::perf This PR introduces dataflow analysis to `redundant_clone` lint to filter out borrowed variables, which had been incorrectly detected. Depends on rust-lang/rust#64207. changelog: Moved `redundant_clone` lint to `perf` group # What this lint catches ## `clone`/`to_owned` ```rust let s = String::new(); let t = s.clone(); ``` ```rust // MIR _1 = String::new(); _2 = &_1; _3 = clone(_2); // (*) ``` We can turn this `clone` call into a move if 1. `_2` is the sole borrow of `_1` at the statement `(*)` 2. `_1` is not used hereafter ## `Deref` + type-specific `to_owned` method ```rust let s = std::path::PathBuf::new(); let t = s.to_path_buf(); ``` ```rust // MIR _1 = PathBuf::new(); _2 = &1; _3 = call deref(_2); _4 = _3; // Copies borrow StorageDead(_2); _5 = Path::to_path_buf(_4); // (*) ``` We can turn this `to_path_buf` call into a move if 1. `_3` `_4` are the sole borrow of `_1` at `(*)` 2. `_1` is not used hereafter # What this PR introduces 1. `MaybeStorageLive` that determines whether a local lives at a particular location 2. `PossibleBorrowerVisitor` that constructs [`TransitiveRelation`](https://doc.rust-lang.org/nightly/nightly-rustc/rustc_data_structures/transitive_relation/struct.TransitiveRelation.html) of possible borrows, e.g. visiting `_2 = &1; _3 = &_2:` will result in `_3 -> _2 -> _1` relation. Then `_3` and `_2` will be counted as possible borrowers of `_1` in the sole-borrow analysis above.
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
I'm working on fixing false-positives of a MIR-based clippy lint (rust-lang/rust-clippy#4509), and in need of the dataflow infrastructure.