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Auto merge of #11698 - a1phyr:waker_clone_and_wake, r=y21
Add `waker_clone_and_wake` lint to check needless `Waker` clones Check for patterns of `waker.clone().wake()` and replace them with `waker.wake_by_ref()`. An alternative name could be `waker_clone_then_wake` changelog: [ `waker_clone_wake`]: new lint
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commit
2f0f4ddcf7
8 changed files with 137 additions and 0 deletions
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@ -5589,6 +5589,7 @@ Released 2018-09-13
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[`verbose_bit_mask`]: https://rust-lang.github.io/rust-clippy/master/index.html#verbose_bit_mask
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[`verbose_file_reads`]: https://rust-lang.github.io/rust-clippy/master/index.html#verbose_file_reads
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[`vtable_address_comparisons`]: https://rust-lang.github.io/rust-clippy/master/index.html#vtable_address_comparisons
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[`waker_clone_wake`]: https://rust-lang.github.io/rust-clippy/master/index.html#waker_clone_wake
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[`while_immutable_condition`]: https://rust-lang.github.io/rust-clippy/master/index.html#while_immutable_condition
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[`while_let_loop`]: https://rust-lang.github.io/rust-clippy/master/index.html#while_let_loop
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[`while_let_on_iterator`]: https://rust-lang.github.io/rust-clippy/master/index.html#while_let_on_iterator
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@ -443,6 +443,7 @@ pub(crate) static LINTS: &[&crate::LintInfo] = &[
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crate::methods::USELESS_ASREF_INFO,
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crate::methods::VEC_RESIZE_TO_ZERO_INFO,
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crate::methods::VERBOSE_FILE_READS_INFO,
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crate::methods::WAKER_CLONE_WAKE_INFO,
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crate::methods::WRONG_SELF_CONVENTION_INFO,
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crate::methods::ZST_OFFSET_INFO,
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crate::min_ident_chars::MIN_IDENT_CHARS_INFO,
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@ -112,6 +112,7 @@ mod useless_asref;
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mod utils;
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mod vec_resize_to_zero;
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mod verbose_file_reads;
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mod waker_clone_wake;
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mod wrong_self_convention;
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mod zst_offset;
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@ -3632,6 +3633,28 @@ declare_clippy_lint! {
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"`as_str` used to call a method on `str` that is also available on `String`"
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}
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declare_clippy_lint! {
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/// ### What it does
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/// Checks for usage of `waker.clone().wake()`
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///
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/// ### Why is this bad?
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/// Cloning the waker is not necessary, `wake_by_ref()` enables the same operation
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/// without extra cloning/dropping.
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///
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/// ### Example
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/// ```rust,ignore
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/// waker.clone().wake();
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/// ```
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/// Should be written
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/// ```rust,ignore
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/// waker.wake_by_ref();
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/// ```
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#[clippy::version = "1.75.0"]
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pub WAKER_CLONE_WAKE,
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perf,
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"cloning a `Waker` only to wake it"
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}
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pub struct Methods {
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avoid_breaking_exported_api: bool,
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msrv: Msrv,
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@ -3777,6 +3800,7 @@ impl_lint_pass!(Methods => [
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ITER_OUT_OF_BOUNDS,
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PATH_ENDS_WITH_EXT,
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REDUNDANT_AS_STR,
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WAKER_CLONE_WAKE,
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]);
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/// Extracts a method call name, args, and `Span` of the method name.
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@ -4365,6 +4389,9 @@ impl Methods {
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}
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unnecessary_literal_unwrap::check(cx, expr, recv, name, args);
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},
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("wake", []) => {
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waker_clone_wake::check(cx, expr, recv);
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}
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("write", []) => {
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readonly_write_lock::check(cx, expr, recv);
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}
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32
clippy_lints/src/methods/waker_clone_wake.rs
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32
clippy_lints/src/methods/waker_clone_wake.rs
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@ -0,0 +1,32 @@
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use clippy_utils::diagnostics::span_lint_and_sugg;
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use clippy_utils::source::snippet_with_applicability;
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use clippy_utils::{is_trait_method, match_def_path, paths};
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use rustc_errors::Applicability;
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use rustc_hir::{Expr, ExprKind};
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use rustc_lint::LateContext;
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use rustc_span::sym;
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use super::WAKER_CLONE_WAKE;
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pub(super) fn check<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, recv: &'tcx Expr<'_>) {
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let ty = cx.typeck_results().expr_ty(recv);
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if let Some(did) = ty.ty_adt_def()
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&& match_def_path(cx, did.did(), &paths::WAKER)
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&& let ExprKind::MethodCall(_, waker_ref, &[], _) = recv.kind
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&& is_trait_method(cx, recv, sym::Clone)
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{
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let mut applicability = Applicability::MachineApplicable;
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let snippet = snippet_with_applicability(cx, waker_ref.span.source_callsite(), "..", &mut applicability);
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span_lint_and_sugg(
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cx,
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WAKER_CLONE_WAKE,
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expr.span,
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"cloning a `Waker` only to wake it",
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"replace with",
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format!("{snippet}.wake_by_ref()"),
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applicability,
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);
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}
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}
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@ -112,6 +112,7 @@ pub const VEC_RESIZE: [&str; 4] = ["alloc", "vec", "Vec", "resize"];
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pub const INSTANT_NOW: [&str; 4] = ["std", "time", "Instant", "now"];
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pub const VEC_IS_EMPTY: [&str; 4] = ["alloc", "vec", "Vec", "is_empty"];
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pub const VEC_POP: [&str; 4] = ["alloc", "vec", "Vec", "pop"];
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pub const WAKER: [&str; 4] = ["core", "task", "wake", "Waker"];
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pub const OPTION_UNWRAP: [&str; 4] = ["core", "option", "Option", "unwrap"];
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pub const OPTION_EXPECT: [&str; 4] = ["core", "option", "Option", "expect"];
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#[expect(clippy::invalid_paths)] // not sure why it thinks this, it works so
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29
tests/ui/waker_clone_wake.fixed
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29
tests/ui/waker_clone_wake.fixed
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@ -0,0 +1,29 @@
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#[derive(Clone)]
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pub struct Custom;
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impl Custom {
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pub fn wake(self) {}
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}
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macro_rules! mac {
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($cx:ident) => {
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$cx.waker()
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};
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}
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pub fn wake(cx: &mut std::task::Context) {
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cx.waker().wake_by_ref();
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mac!(cx).wake_by_ref();
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}
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pub fn no_lint(cx: &mut std::task::Context, c: &Custom) {
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c.clone().wake();
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let w = cx.waker().clone();
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w.wake();
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cx.waker().clone().wake_by_ref();
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}
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fn main() {}
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tests/ui/waker_clone_wake.rs
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29
tests/ui/waker_clone_wake.rs
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@ -0,0 +1,29 @@
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#[derive(Clone)]
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pub struct Custom;
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impl Custom {
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pub fn wake(self) {}
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}
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macro_rules! mac {
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($cx:ident) => {
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$cx.waker()
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};
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}
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pub fn wake(cx: &mut std::task::Context) {
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cx.waker().clone().wake();
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mac!(cx).clone().wake();
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}
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pub fn no_lint(cx: &mut std::task::Context, c: &Custom) {
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c.clone().wake();
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let w = cx.waker().clone();
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w.wake();
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cx.waker().clone().wake_by_ref();
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}
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fn main() {}
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17
tests/ui/waker_clone_wake.stderr
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17
tests/ui/waker_clone_wake.stderr
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@ -0,0 +1,17 @@
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error: cloning a `Waker` only to wake it
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--> $DIR/waker_clone_wake.rs:15:5
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LL | cx.waker().clone().wake();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `cx.waker().wake_by_ref()`
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= note: `-D clippy::waker-clone-wake` implied by `-D warnings`
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= help: to override `-D warnings` add `#[allow(clippy::waker_clone_wake)]`
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error: cloning a `Waker` only to wake it
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--> $DIR/waker_clone_wake.rs:17:5
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LL | mac!(cx).clone().wake();
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| ^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `mac!(cx).wake_by_ref()`
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error: aborting due to 2 previous errors
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