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https://github.com/rust-lang/rust-clippy
synced 2024-09-20 22:51:58 +00:00
Fix needless_pass_by_value
This also accidentally improved the spans of the suggestions
This commit is contained in:
flip1995
parent
b46f5b4a98
commit
c420b07191
3 changed files with 15 additions and 109 deletions
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@ -134,7 +134,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for NeedlessPassByValue {
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spans_need_deref,
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..
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} = {
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let mut ctx = MovedVariablesCtxt::new(cx);
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let mut ctx = MovedVariablesCtxt::default();
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let region_scope_tree = &cx.tcx.region_scope_tree(fn_def_id);
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euv::ExprUseVisitor::new(
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&mut ctx,
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@ -324,98 +324,28 @@ fn requires_exact_signature(attrs: &[Attribute]) -> bool {
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})
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}
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struct MovedVariablesCtxt<'a, 'tcx> {
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cx: &'a LateContext<'a, 'tcx>,
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#[derive(Default)]
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struct MovedVariablesCtxt {
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moved_vars: FxHashSet<HirId>,
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/// Spans which need to be prefixed with `*` for dereferencing the
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/// suggested additional reference.
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spans_need_deref: FxHashMap<HirId, FxHashSet<Span>>,
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}
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impl<'a, 'tcx> MovedVariablesCtxt<'a, 'tcx> {
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fn new(cx: &'a LateContext<'a, 'tcx>) -> Self {
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Self {
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cx,
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moved_vars: FxHashSet::default(),
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spans_need_deref: FxHashMap::default(),
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}
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}
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fn move_common(&mut self, _consume_id: HirId, _span: Span, cmt: &mc::cmt_<'tcx>) {
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impl MovedVariablesCtxt {
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fn move_common(&mut self, cmt: &mc::cmt_<'_>) {
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let cmt = unwrap_downcast_or_interior(cmt);
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if let mc::Categorization::Local(vid) = cmt.cat {
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self.moved_vars.insert(vid);
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}
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}
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fn non_moving_pat(&mut self, matched_pat: &Pat, cmt: &mc::cmt_<'tcx>) {
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let cmt = unwrap_downcast_or_interior(cmt);
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if let mc::Categorization::Local(vid) = cmt.cat {
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let mut id = matched_pat.hir_id;
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loop {
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let parent = self.cx.tcx.hir().get_parent_node(id);
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if id == parent {
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// no parent
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return;
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}
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id = parent;
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if let Some(node) = self.cx.tcx.hir().find(id) {
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match node {
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Node::Expr(e) => {
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// `match` and `if let`
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if let ExprKind::Match(ref c, ..) = e.kind {
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self.spans_need_deref
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.entry(vid)
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.or_insert_with(FxHashSet::default)
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.insert(c.span);
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}
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},
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Node::Stmt(s) => {
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// `let <pat> = x;`
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if_chain! {
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if let StmtKind::Local(ref local) = s.kind;
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then {
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self.spans_need_deref
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.entry(vid)
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.or_insert_with(FxHashSet::default)
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.insert(local.init
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.as_ref()
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.map(|e| e.span)
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.expect("`let` stmt without init aren't caught by match_pat"));
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}
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}
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},
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_ => {},
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}
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}
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}
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}
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}
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}
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impl<'a, 'tcx> euv::Delegate<'tcx> for MovedVariablesCtxt<'a, 'tcx> {
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impl<'tcx> euv::Delegate<'tcx> for MovedVariablesCtxt {
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fn consume(&mut self, cmt: &mc::cmt_<'tcx>, mode: euv::ConsumeMode) {
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if let euv::ConsumeMode::Move = mode {
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self.move_common(cmt.hir_id, cmt.span, cmt);
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}
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}
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fn matched_pat(&mut self, matched_pat: &Pat, cmt: &mc::cmt_<'tcx>, mode: euv::MatchMode) {
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if let euv::MatchMode::MovingMatch = mode {
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self.move_common(matched_pat.hir_id, matched_pat.span, cmt);
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} else {
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self.non_moving_pat(matched_pat, cmt);
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}
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}
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fn consume_pat(&mut self, consume_pat: &Pat, cmt: &mc::cmt_<'tcx>, mode: euv::ConsumeMode) {
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if let euv::ConsumeMode::Move(_) = mode {
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self.move_common(consume_pat.hir_id, consume_pat.span, cmt);
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self.move_common(cmt);
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}
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}
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@ -2,7 +2,7 @@ error: attempt to mutate range bound within loop; note that the range of the loo
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--> $DIR/mut_range_bound.rs:16:9
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LL | m = 5;
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| ^^^^^
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| ^
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= note: `-D clippy::mut-range-bound` implied by `-D warnings`
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@ -10,19 +10,19 @@ error: attempt to mutate range bound within loop; note that the range of the loo
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--> $DIR/mut_range_bound.rs:23:9
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LL | m *= 2;
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| ^^^^^^
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| ^
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error: attempt to mutate range bound within loop; note that the range of the loop is unchanged
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--> $DIR/mut_range_bound.rs:31:9
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LL | m = 5;
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| ^^^^^
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| ^
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error: attempt to mutate range bound within loop; note that the range of the loop is unchanged
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--> $DIR/mut_range_bound.rs:32:9
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LL | n = 7;
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| ^^^^^
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| ^
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error: attempt to mutate range bound within loop; note that the range of the loop is unchanged
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--> $DIR/mut_range_bound.rs:46:22
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@ -28,12 +28,7 @@ error: this argument is passed by value, but not consumed in the function body
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--> $DIR/needless_pass_by_value.rs:49:18
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LL | fn test_match(x: Option<Option<String>>, y: Option<Option<String>>) {
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| ^^^^^^^^^^^^^^^^^^^^^^
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help: consider taking a reference instead
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LL | fn test_match(x: &Option<Option<String>>, y: Option<Option<String>>) {
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LL | match *x {
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| ^^^^^^^^^^^^^^^^^^^^^^ help: consider taking a reference instead: `&Option<Option<String>>`
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error: this argument is passed by value, but not consumed in the function body
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--> $DIR/needless_pass_by_value.rs:62:24
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@ -45,14 +40,7 @@ error: this argument is passed by value, but not consumed in the function body
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--> $DIR/needless_pass_by_value.rs:62:36
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LL | fn test_destructure(x: Wrapper, y: Wrapper, z: Wrapper) {
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| ^^^^^^^
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help: consider taking a reference instead
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LL | fn test_destructure(x: Wrapper, y: &Wrapper, z: Wrapper) {
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LL | let Wrapper(s) = z; // moved
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LL | let Wrapper(ref t) = *y; // not moved
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LL | let Wrapper(_) = *y; // still not moved
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| ^^^^^^^ help: consider taking a reference instead: `&Wrapper`
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error: this argument is passed by value, but not consumed in the function body
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--> $DIR/needless_pass_by_value.rs:78:49
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@ -152,37 +140,25 @@ error: this argument is passed by value, but not consumed in the function body
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--> $DIR/needless_pass_by_value.rs:131:45
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LL | fn test_destructure_copy(x: CopyWrapper, y: CopyWrapper, z: CopyWrapper) {
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| ^^^^^^^^^^^
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| ^^^^^^^^^^^ help: consider taking a reference instead: `&CopyWrapper`
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help: consider marking this type as Copy
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--> $DIR/needless_pass_by_value.rs:123:1
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LL | struct CopyWrapper(u32);
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| ^^^^^^^^^^^^^^^^^^^^^^^^
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help: consider taking a reference instead
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LL | fn test_destructure_copy(x: CopyWrapper, y: &CopyWrapper, z: CopyWrapper) {
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LL | let CopyWrapper(s) = z; // moved
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LL | let CopyWrapper(ref t) = *y; // not moved
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LL | let CopyWrapper(_) = *y; // still not moved
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error: this argument is passed by value, but not consumed in the function body
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--> $DIR/needless_pass_by_value.rs:131:61
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LL | fn test_destructure_copy(x: CopyWrapper, y: CopyWrapper, z: CopyWrapper) {
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| ^^^^^^^^^^^
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| ^^^^^^^^^^^ help: consider taking a reference instead: `&CopyWrapper`
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help: consider marking this type as Copy
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--> $DIR/needless_pass_by_value.rs:123:1
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LL | struct CopyWrapper(u32);
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| ^^^^^^^^^^^^^^^^^^^^^^^^
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help: consider taking a reference instead
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LL | fn test_destructure_copy(x: CopyWrapper, y: CopyWrapper, z: &CopyWrapper) {
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LL | let CopyWrapper(s) = *z; // moved
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error: this argument is passed by value, but not consumed in the function body
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--> $DIR/needless_pass_by_value.rs:143:40
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