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Auto merge of #11207 - Centri3:#11182, r=giraffate
[`needless_pass_by_ref_mut`]: Do not lint if passed as a fn-like argument Fixes #11182 and also fixes #11199 (though this is kind of a duplicate) There's likely a case or two I've missed, so this likely needs a bit more work but it seems to work fine with the tests I've added. PS, the diff for the test is useless because it iterates over a hashmap before linting. Seems to work fine but we could maybe change this for consistency's sake changelog: [`needless_pass_by_ref_mut`]: No longer lints if the function is passed as a fn-like argument
This commit is contained in:
bors
commit
43b0e1101b
@ -1,16 +1,16 @@
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use super::needless_pass_by_value::requires_exact_signature;
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use clippy_utils::diagnostics::span_lint_and_then;
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use clippy_utils::diagnostics::span_lint_hir_and_then;
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use clippy_utils::source::snippet;
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use clippy_utils::{is_from_proc_macro, is_self};
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use if_chain::if_chain;
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use rustc_data_structures::fx::FxHashSet;
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use clippy_utils::{get_parent_node, is_from_proc_macro, is_self};
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use rustc_data_structures::fx::{FxHashSet, FxIndexMap};
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use rustc_errors::Applicability;
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use rustc_hir::intravisit::FnKind;
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use rustc_hir::{Body, FnDecl, HirId, HirIdMap, HirIdSet, Impl, ItemKind, Mutability, Node, PatKind};
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use rustc_hir::intravisit::{walk_qpath, FnKind, Visitor};
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use rustc_hir::{Body, ExprKind, FnDecl, HirId, HirIdMap, HirIdSet, Impl, ItemKind, Mutability, Node, PatKind, QPath};
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use rustc_hir_typeck::expr_use_visitor as euv;
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use rustc_infer::infer::TyCtxtInferExt;
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use rustc_lint::{LateContext, LateLintPass};
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use rustc_middle::hir::map::associated_body;
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use rustc_middle::hir::nested_filter::OnlyBodies;
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use rustc_middle::mir::FakeReadCause;
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use rustc_middle::ty::{self, Ty, UpvarId, UpvarPath};
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use rustc_session::{declare_tool_lint, impl_lint_pass};
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@ -48,20 +48,24 @@ declare_clippy_lint! {
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"using a `&mut` argument when it's not mutated"
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}
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#[derive(Copy, Clone)]
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pub struct NeedlessPassByRefMut {
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#[derive(Clone)]
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pub struct NeedlessPassByRefMut<'tcx> {
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avoid_breaking_exported_api: bool,
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used_fn_def_ids: FxHashSet<LocalDefId>,
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fn_def_ids_to_maybe_unused_mut: FxIndexMap<LocalDefId, Vec<rustc_hir::Ty<'tcx>>>,
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}
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impl NeedlessPassByRefMut {
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impl NeedlessPassByRefMut<'_> {
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pub fn new(avoid_breaking_exported_api: bool) -> Self {
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Self {
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avoid_breaking_exported_api,
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used_fn_def_ids: FxHashSet::default(),
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fn_def_ids_to_maybe_unused_mut: FxIndexMap::default(),
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}
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}
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}
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impl_lint_pass!(NeedlessPassByRefMut => [NEEDLESS_PASS_BY_REF_MUT]);
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impl_lint_pass!(NeedlessPassByRefMut<'_> => [NEEDLESS_PASS_BY_REF_MUT]);
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fn should_skip<'tcx>(
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cx: &LateContext<'tcx>,
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@ -89,12 +93,12 @@ fn should_skip<'tcx>(
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is_from_proc_macro(cx, &input)
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}
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impl<'tcx> LateLintPass<'tcx> for NeedlessPassByRefMut {
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impl<'tcx> LateLintPass<'tcx> for NeedlessPassByRefMut<'tcx> {
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fn check_fn(
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&mut self,
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cx: &LateContext<'tcx>,
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kind: FnKind<'tcx>,
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decl: &'tcx FnDecl<'_>,
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decl: &'tcx FnDecl<'tcx>,
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body: &'tcx Body<'_>,
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span: Span,
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fn_def_id: LocalDefId,
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@ -140,7 +144,6 @@ impl<'tcx> LateLintPass<'tcx> for NeedlessPassByRefMut {
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if it.peek().is_none() {
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return;
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}
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// Collect variables mutably used and spans which will need dereferencings from the
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// function body.
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let MutablyUsedVariablesCtxt { mutably_used_vars, .. } = {
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@ -165,30 +168,45 @@ impl<'tcx> LateLintPass<'tcx> for NeedlessPassByRefMut {
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}
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ctx
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};
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let show_semver_warning = self.avoid_breaking_exported_api && cx.effective_visibilities.is_exported(fn_def_id);
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for ((&input, &_), arg) in it {
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// Only take `&mut` arguments.
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if_chain! {
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if let PatKind::Binding(_, canonical_id, ..) = arg.pat.kind;
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if !mutably_used_vars.contains(&canonical_id);
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if let rustc_hir::TyKind::Ref(_, inner_ty) = input.kind;
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then {
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// If the argument is never used mutably, we emit the warning.
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let sp = input.span;
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span_lint_and_then(
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if let PatKind::Binding(_, canonical_id, ..) = arg.pat.kind
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&& !mutably_used_vars.contains(&canonical_id)
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{
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self.fn_def_ids_to_maybe_unused_mut.entry(fn_def_id).or_default().push(input);
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}
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}
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}
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fn check_crate_post(&mut self, cx: &LateContext<'tcx>) {
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cx.tcx.hir().visit_all_item_likes_in_crate(&mut FnNeedsMutVisitor {
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cx,
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used_fn_def_ids: &mut self.used_fn_def_ids,
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});
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for (fn_def_id, unused) in self
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.fn_def_ids_to_maybe_unused_mut
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.iter()
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.filter(|(def_id, _)| !self.used_fn_def_ids.contains(def_id))
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{
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let show_semver_warning =
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self.avoid_breaking_exported_api && cx.effective_visibilities.is_exported(*fn_def_id);
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for input in unused {
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// If the argument is never used mutably, we emit the warning.
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let sp = input.span;
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if let rustc_hir::TyKind::Ref(_, inner_ty) = input.kind {
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span_lint_hir_and_then(
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cx,
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NEEDLESS_PASS_BY_REF_MUT,
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cx.tcx.hir().local_def_id_to_hir_id(*fn_def_id),
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sp,
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"this argument is a mutable reference, but not used mutably",
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|diag| {
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diag.span_suggestion(
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sp,
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"consider changing to".to_string(),
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format!(
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"&{}",
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snippet(cx, cx.tcx.hir().span(inner_ty.ty.hir_id), "_"),
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),
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format!("&{}", snippet(cx, cx.tcx.hir().span(inner_ty.ty.hir_id), "_"),),
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Applicability::Unspecified,
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);
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if show_semver_warning {
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@ -316,3 +334,44 @@ impl<'tcx> euv::Delegate<'tcx> for MutablyUsedVariablesCtxt {
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self.prev_bind = Some(id);
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}
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}
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/// A final pass to check for paths referencing this function that require the argument to be
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/// `&mut`, basically if the function is ever used as a `fn`-like argument.
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struct FnNeedsMutVisitor<'a, 'tcx> {
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cx: &'a LateContext<'tcx>,
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used_fn_def_ids: &'a mut FxHashSet<LocalDefId>,
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}
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impl<'tcx> Visitor<'tcx> for FnNeedsMutVisitor<'_, 'tcx> {
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type NestedFilter = OnlyBodies;
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fn nested_visit_map(&mut self) -> Self::Map {
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self.cx.tcx.hir()
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}
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fn visit_qpath(&mut self, qpath: &'tcx QPath<'tcx>, hir_id: HirId, _: Span) {
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walk_qpath(self, qpath, hir_id);
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let Self { cx, used_fn_def_ids } = self;
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// #11182; do not lint if mutability is required elsewhere
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if let Node::Expr(expr) = cx.tcx.hir().get(hir_id)
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&& let Some(parent) = get_parent_node(cx.tcx, expr.hir_id)
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&& let ty::FnDef(def_id, _) = cx.tcx.typeck(cx.tcx.hir().enclosing_body_owner(hir_id)).expr_ty(expr).kind()
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&& let Some(def_id) = def_id.as_local()
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{
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if let Node::Expr(e) = parent
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&& let ExprKind::Call(call, _) = e.kind
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&& call.hir_id == expr.hir_id
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{
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return;
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}
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// We don't need to check each argument individually as you cannot coerce a function
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// taking `&mut` -> `&`, for some reason, so if we've gotten this far we know it's
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// passed as a `fn`-like argument (or is unified) and should ignore every "unused"
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// argument entirely
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used_fn_def_ids.insert(def_id);
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}
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}
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}
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@ -1,11 +1,3 @@
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error: this argument is a mutable reference, but not used mutably
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--> $DIR/infinite_loop.rs:7:17
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|
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LL | fn fn_mutref(i: &mut i32) {
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| ^^^^^^^^ help: consider changing to: `&i32`
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|
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= note: `-D clippy::needless-pass-by-ref-mut` implied by `-D warnings`
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error: variables in the condition are not mutated in the loop body
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--> $DIR/infinite_loop.rs:20:11
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|
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@ -99,5 +91,13 @@ LL | while y < 10 {
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= note: this loop contains `return`s or `break`s
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= help: rewrite it as `if cond { loop { } }`
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error: this argument is a mutable reference, but not used mutably
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--> $DIR/infinite_loop.rs:7:17
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|
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LL | fn fn_mutref(i: &mut i32) {
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| ^^^^^^^^ help: consider changing to: `&i32`
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|
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= note: `-D clippy::needless-pass-by-ref-mut` implied by `-D warnings`
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error: aborting due to 12 previous errors
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@ -1,11 +1,3 @@
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error: this argument is a mutable reference, but not used mutably
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--> $DIR/let_underscore_future.rs:11:35
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|
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LL | fn do_something_to_future(future: &mut impl Future<Output = ()>) {}
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider changing to: `&impl Future<Output = ()>`
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|
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= note: `-D clippy::needless-pass-by-ref-mut` implied by `-D warnings`
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error: non-binding `let` on a future
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--> $DIR/let_underscore_future.rs:14:5
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|
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@ -31,5 +23,13 @@ LL | let _ = future;
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|
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= help: consider awaiting the future or dropping explicitly with `std::mem::drop`
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error: this argument is a mutable reference, but not used mutably
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--> $DIR/let_underscore_future.rs:11:35
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|
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LL | fn do_something_to_future(future: &mut impl Future<Output = ()>) {}
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider changing to: `&impl Future<Output = ()>`
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|
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= note: `-D clippy::needless-pass-by-ref-mut` implied by `-D warnings`
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error: aborting due to 4 previous errors
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@ -12,14 +12,6 @@ error: mutable key type
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LL | fn should_not_take_this_arg(m: &mut HashMap<Key, usize>, _n: usize) -> HashSet<Key> {
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| ^^^^^^^^^^^^
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error: this argument is a mutable reference, but not used mutably
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--> $DIR/mut_key.rs:31:32
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|
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LL | fn should_not_take_this_arg(m: &mut HashMap<Key, usize>, _n: usize) -> HashSet<Key> {
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| ^^^^^^^^^^^^^^^^^^^^^^^^ help: consider changing to: `&HashMap<Key, usize>`
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|
|
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= note: `-D clippy::needless-pass-by-ref-mut` implied by `-D warnings`
|
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|
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error: mutable key type
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--> $DIR/mut_key.rs:32:5
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|
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@ -110,5 +102,13 @@ error: mutable key type
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LL | let _map = HashMap::<Arc<Cell<usize>>, usize>::new();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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|
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error: this argument is a mutable reference, but not used mutably
|
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--> $DIR/mut_key.rs:31:32
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|
|
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LL | fn should_not_take_this_arg(m: &mut HashMap<Key, usize>, _n: usize) -> HashSet<Key> {
|
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| ^^^^^^^^^^^^^^^^^^^^^^^^ help: consider changing to: `&HashMap<Key, usize>`
|
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|
|
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= note: `-D clippy::needless-pass-by-ref-mut` implied by `-D warnings`
|
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|
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error: aborting due to 18 previous errors
|
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|
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|
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@ -1,17 +1,3 @@
|
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error: this argument is a mutable reference, but not used mutably
|
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--> $DIR/mut_reference.rs:4:33
|
||||
|
|
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LL | fn takes_a_mutable_reference(a: &mut i32) {}
|
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| ^^^^^^^^ help: consider changing to: `&i32`
|
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|
|
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= note: `-D clippy::needless-pass-by-ref-mut` implied by `-D warnings`
|
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|
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error: this argument is a mutable reference, but not used mutably
|
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--> $DIR/mut_reference.rs:11:44
|
||||
|
|
||||
LL | fn takes_a_mutable_reference(&self, a: &mut i32) {}
|
||||
| ^^^^^^^^ help: consider changing to: `&i32`
|
||||
|
||||
error: the function `takes_an_immutable_reference` doesn't need a mutable reference
|
||||
--> $DIR/mut_reference.rs:17:34
|
||||
|
|
||||
@ -32,5 +18,13 @@ error: the method `takes_an_immutable_reference` doesn't need a mutable referenc
|
||||
LL | my_struct.takes_an_immutable_reference(&mut 42);
|
||||
| ^^^^^^^
|
||||
|
||||
error: aborting due to 5 previous errors
|
||||
error: this argument is a mutable reference, but not used mutably
|
||||
--> $DIR/mut_reference.rs:11:44
|
||||
|
|
||||
LL | fn takes_a_mutable_reference(&self, a: &mut i32) {}
|
||||
| ^^^^^^^^ help: consider changing to: `&i32`
|
||||
|
|
||||
= note: `-D clippy::needless-pass-by-ref-mut` implied by `-D warnings`
|
||||
|
||||
error: aborting due to 4 previous errors
|
||||
|
||||
|
||||
@ -1,4 +1,5 @@
|
||||
#![allow(unused)]
|
||||
#![allow(clippy::if_same_then_else, clippy::no_effect)]
|
||||
#![feature(lint_reasons)]
|
||||
|
||||
use std::ptr::NonNull;
|
||||
|
||||
@ -155,15 +156,48 @@ async fn a8(x: i32, a: &mut i32, y: i32, z: &mut i32) {
|
||||
println!("{:?}", z);
|
||||
}
|
||||
|
||||
fn main() {
|
||||
// let mut u = 0;
|
||||
// let mut v = vec![0];
|
||||
// foo(&mut v, &0, &mut u);
|
||||
// foo2(&mut v);
|
||||
// foo3(&mut v);
|
||||
// foo4(&mut v);
|
||||
// foo5(&mut v);
|
||||
// alias_check(&mut v);
|
||||
// alias_check2(&mut v);
|
||||
// println!("{u}");
|
||||
// Should not warn (passed as closure which takes `&mut`).
|
||||
fn passed_as_closure(s: &mut u32) {}
|
||||
|
||||
// Should not warn.
|
||||
fn passed_as_local(s: &mut u32) {}
|
||||
|
||||
// Should not warn.
|
||||
fn ty_unify_1(s: &mut u32) {}
|
||||
|
||||
// Should not warn.
|
||||
fn ty_unify_2(s: &mut u32) {}
|
||||
|
||||
// Should not warn.
|
||||
fn passed_as_field(s: &mut u32) {}
|
||||
|
||||
fn closure_takes_mut(s: fn(&mut u32)) {}
|
||||
|
||||
struct A {
|
||||
s: fn(&mut u32),
|
||||
}
|
||||
|
||||
// Should warn.
|
||||
fn used_as_path(s: &mut u32) {}
|
||||
|
||||
// Make sure lint attributes work fine
|
||||
#[expect(clippy::needless_pass_by_ref_mut)]
|
||||
fn lint_attr(s: &mut u32) {}
|
||||
|
||||
fn main() {
|
||||
let mut u = 0;
|
||||
let mut v = vec![0];
|
||||
foo(&mut v, &0, &mut u);
|
||||
foo2(&mut v);
|
||||
foo3(&mut v);
|
||||
foo4(&mut v);
|
||||
foo5(&mut v);
|
||||
alias_check(&mut v);
|
||||
alias_check2(&mut v);
|
||||
println!("{u}");
|
||||
closure_takes_mut(passed_as_closure);
|
||||
A { s: passed_as_field };
|
||||
used_as_path;
|
||||
let _: fn(&mut u32) = passed_as_local;
|
||||
let _ = if v[0] == 0 { ty_unify_1 } else { ty_unify_2 };
|
||||
}
|
||||
|
||||
@ -1,5 +1,5 @@
|
||||
error: this argument is a mutable reference, but not used mutably
|
||||
--> $DIR/needless_pass_by_ref_mut.rs:6:11
|
||||
--> $DIR/needless_pass_by_ref_mut.rs:7:11
|
||||
|
|
||||
LL | fn foo(s: &mut Vec<u32>, b: &u32, x: &mut u32) {
|
||||
| ^^^^^^^^^^^^^ help: consider changing to: `&Vec<u32>`
|
||||
@ -7,73 +7,73 @@ LL | fn foo(s: &mut Vec<u32>, b: &u32, x: &mut u32) {
|
||||
= note: `-D clippy::needless-pass-by-ref-mut` implied by `-D warnings`
|
||||
|
||||
error: this argument is a mutable reference, but not used mutably
|
||||
--> $DIR/needless_pass_by_ref_mut.rs:31:12
|
||||
--> $DIR/needless_pass_by_ref_mut.rs:32:12
|
||||
|
|
||||
LL | fn foo6(s: &mut Vec<u32>) {
|
||||
| ^^^^^^^^^^^^^ help: consider changing to: `&Vec<u32>`
|
||||
|
||||
error: this argument is a mutable reference, but not used mutably
|
||||
--> $DIR/needless_pass_by_ref_mut.rs:44:29
|
||||
--> $DIR/needless_pass_by_ref_mut.rs:45:29
|
||||
|
|
||||
LL | fn mushroom(&self, vec: &mut Vec<i32>) -> usize {
|
||||
| ^^^^^^^^^^^^^ help: consider changing to: `&Vec<i32>`
|
||||
|
||||
error: this argument is a mutable reference, but not used mutably
|
||||
--> $DIR/needless_pass_by_ref_mut.rs:49:31
|
||||
--> $DIR/needless_pass_by_ref_mut.rs:50:31
|
||||
|
|
||||
LL | fn badger(&mut self, vec: &mut Vec<i32>) -> usize {
|
||||
| ^^^^^^^^^^^^^ help: consider changing to: `&Vec<i32>`
|
||||
|
||||
error: this argument is a mutable reference, but not used mutably
|
||||
--> $DIR/needless_pass_by_ref_mut.rs:126:16
|
||||
--> $DIR/needless_pass_by_ref_mut.rs:127:16
|
||||
|
|
||||
LL | async fn a1(x: &mut i32) {
|
||||
| ^^^^^^^^ help: consider changing to: `&i32`
|
||||
|
||||
error: this argument is a mutable reference, but not used mutably
|
||||
--> $DIR/needless_pass_by_ref_mut.rs:130:16
|
||||
--> $DIR/needless_pass_by_ref_mut.rs:131:16
|
||||
|
|
||||
LL | async fn a2(x: &mut i32, y: String) {
|
||||
| ^^^^^^^^ help: consider changing to: `&i32`
|
||||
|
||||
error: this argument is a mutable reference, but not used mutably
|
||||
--> $DIR/needless_pass_by_ref_mut.rs:134:16
|
||||
--> $DIR/needless_pass_by_ref_mut.rs:135:16
|
||||
|
|
||||
LL | async fn a3(x: &mut i32, y: String, z: String) {
|
||||
| ^^^^^^^^ help: consider changing to: `&i32`
|
||||
|
||||
error: this argument is a mutable reference, but not used mutably
|
||||
--> $DIR/needless_pass_by_ref_mut.rs:138:16
|
||||
--> $DIR/needless_pass_by_ref_mut.rs:139:16
|
||||
|
|
||||
LL | async fn a4(x: &mut i32, y: i32) {
|
||||
| ^^^^^^^^ help: consider changing to: `&i32`
|
||||
|
||||
error: this argument is a mutable reference, but not used mutably
|
||||
--> $DIR/needless_pass_by_ref_mut.rs:142:24
|
||||
--> $DIR/needless_pass_by_ref_mut.rs:143:24
|
||||
|
|
||||
LL | async fn a5(x: i32, y: &mut i32) {
|
||||
| ^^^^^^^^ help: consider changing to: `&i32`
|
||||
|
||||
error: this argument is a mutable reference, but not used mutably
|
||||
--> $DIR/needless_pass_by_ref_mut.rs:146:24
|
||||
--> $DIR/needless_pass_by_ref_mut.rs:147:24
|
||||
|
|
||||
LL | async fn a6(x: i32, y: &mut i32) {
|
||||
| ^^^^^^^^ help: consider changing to: `&i32`
|
||||
|
||||
error: this argument is a mutable reference, but not used mutably
|
||||
--> $DIR/needless_pass_by_ref_mut.rs:150:32
|
||||
--> $DIR/needless_pass_by_ref_mut.rs:151:32
|
||||
|
|
||||
LL | async fn a7(x: i32, y: i32, z: &mut i32) {
|
||||
| ^^^^^^^^ help: consider changing to: `&i32`
|
||||
|
||||
error: this argument is a mutable reference, but not used mutably
|
||||
--> $DIR/needless_pass_by_ref_mut.rs:154:24
|
||||
--> $DIR/needless_pass_by_ref_mut.rs:155:24
|
||||
|
|
||||
LL | async fn a8(x: i32, a: &mut i32, y: i32, z: &mut i32) {
|
||||
| ^^^^^^^^ help: consider changing to: `&i32`
|
||||
|
||||
error: this argument is a mutable reference, but not used mutably
|
||||
--> $DIR/needless_pass_by_ref_mut.rs:154:45
|
||||
--> $DIR/needless_pass_by_ref_mut.rs:155:45
|
||||
|
|
||||
LL | async fn a8(x: i32, a: &mut i32, y: i32, z: &mut i32) {
|
||||
| ^^^^^^^^ help: consider changing to: `&i32`
|
||||
|
||||
@ -39,15 +39,6 @@ LL | | }
|
||||
|
|
||||
= help: consider implementing the trait `std::hash::Hash` or choosing a less ambiguous method name
|
||||
|
||||
error: this argument is a mutable reference, but not used mutably
|
||||
--> $DIR/method_list_2.rs:38:31
|
||||
|
|
||||
LL | pub fn hash(&self, state: &mut T) {
|
||||
| ^^^^^^ help: consider changing to: `&T`
|
||||
|
|
||||
= warning: changing this function will impact semver compatibility
|
||||
= note: `-D clippy::needless-pass-by-ref-mut` implied by `-D warnings`
|
||||
|
||||
error: method `index` can be confused for the standard trait method `std::ops::Index::index`
|
||||
--> $DIR/method_list_2.rs:42:5
|
||||
|
|
||||
@ -158,5 +149,14 @@ LL | | }
|
||||
|
|
||||
= help: consider implementing the trait `std::ops::Sub` or choosing a less ambiguous method name
|
||||
|
||||
error: this argument is a mutable reference, but not used mutably
|
||||
--> $DIR/method_list_2.rs:38:31
|
||||
|
|
||||
LL | pub fn hash(&self, state: &mut T) {
|
||||
| ^^^^^^ help: consider changing to: `&T`
|
||||
|
|
||||
= warning: changing this function will impact semver compatibility
|
||||
= note: `-D clippy::needless-pass-by-ref-mut` implied by `-D warnings`
|
||||
|
||||
error: aborting due to 16 previous errors
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user