user0/rust
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Auto merge of #4930 - flip1995:unused_label, r=phansch

Browse source 
Deprecate unused_label lint

This lint was uplifted/turned into warn-by-default in rustc

Fixes #4925

changelog: Deprecate [`unused_label`] lint
This commit is contained in:
bors 2019-12-22 09:39:32 +00:00
commit 19dbb22032
11 changed files with 26 additions and 167 deletions
Download patch file Download diff file Expand all files Collapse all files

9
clippy_lints/src/deprecated_lints.rs
View file

@ -138,3 +138,12 @@ declare_deprecated_lint! {
pub INTO_ITER_ON_ARRAY,
"this lint has been uplifted to rustc and is now called `array_into_iter`"
}
declare_deprecated_lint! {
/// **What it does:** Nothing. This lint has been deprecated.
///
/// **Deprecation reason:** This lint has been uplifted to rustc and is now called
/// `unused_labels`.
pub UNUSED_LABEL,
"this lint has been uplifted to rustc and is now called `unused_labels`"
}

9
clippy_lints/src/lib.rs
View file

@ -292,7 +292,6 @@ pub mod types;
pub mod unicode;
pub mod unsafe_removed_from_name;
pub mod unused_io_amount;
pub mod unused_label;
pub mod unused_self;
pub mod unwrap;
pub mod use_self;
@ -446,6 +445,10 @@ pub fn register_plugins(store: &mut lint::LintStore, sess: &Session, conf: &Conf
"clippy::into_iter_on_array",
"this lint has been uplifted to rustc and is now called `array_into_iter`",
);
store.register_removed(
"clippy::unused_label",
"this lint has been uplifted to rustc and is now called `unused_labels`",
);
// end deprecated lints, do not remove this comment, it’s used in `update_lints`
// begin register lints, do not remove this comment, it’s used in `update_lints`
@ -774,7 +777,6 @@ pub fn register_plugins(store: &mut lint::LintStore, sess: &Session, conf: &Conf
&unicode::ZERO_WIDTH_SPACE,
&unsafe_removed_from_name::UNSAFE_REMOVED_FROM_NAME,
&unused_io_amount::UNUSED_IO_AMOUNT,
&unused_label::UNUSED_LABEL,
&unused_self::UNUSED_SELF,
&unwrap::PANICKING_UNWRAP,
&unwrap::UNNECESSARY_UNWRAP,
@ -868,7 +870,6 @@ pub fn register_plugins(store: &mut lint::LintStore, sess: &Session, conf: &Conf
store.register_late_pass(|| box format::UselessFormat);
store.register_late_pass(|| box swap::Swap);
store.register_late_pass(|| box overflow_check_conditional::OverflowCheckConditional);
store.register_late_pass(|| box unused_label::UnusedLabel);
store.register_late_pass(|| box new_without_default::NewWithoutDefault::default());
let blacklisted_names = conf.blacklisted_names.iter().cloned().collect::<FxHashSet<_>>();
store.register_late_pass(move || box blacklisted_name::BlacklistedName::new(blacklisted_names.clone()));
@ -1302,7 +1303,6 @@ pub fn register_plugins(store: &mut lint::LintStore, sess: &Session, conf: &Conf
LintId::of(&unicode::ZERO_WIDTH_SPACE),
LintId::of(&unsafe_removed_from_name::UNSAFE_REMOVED_FROM_NAME),
LintId::of(&unused_io_amount::UNUSED_IO_AMOUNT),
LintId::of(&unused_label::UNUSED_LABEL),
LintId::of(&unwrap::PANICKING_UNWRAP),
LintId::of(&unwrap::UNNECESSARY_UNWRAP),
LintId::of(&vec::USELESS_VEC),
@ -1482,7 +1482,6 @@ pub fn register_plugins(store: &mut lint::LintStore, sess: &Session, conf: &Conf
LintId::of(&types::UNIT_ARG),
LintId::of(&types::UNNECESSARY_CAST),
LintId::of(&types::VEC_BOX),
LintId::of(&unused_label::UNUSED_LABEL),
LintId::of(&unwrap::UNNECESSARY_UNWRAP),
LintId::of(&zero_div_zero::ZERO_DIVIDED_BY_ZERO),
]);

83
clippy_lints/src/unused_label.rs
View file

@ -1,83 +0,0 @@
use crate::utils::span_lint;
use rustc::declare_lint_pass;
use rustc::hir;
use rustc::hir::intravisit::{walk_expr, walk_fn, FnKind, NestedVisitorMap, Visitor};
use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
use rustc_data_structures::fx::FxHashMap;
use rustc_session::declare_tool_lint;
use syntax::source_map::Span;
use syntax::symbol::Symbol;
declare_clippy_lint! {
/// **What it does:** Checks for unused labels.
///
/// **Why is this bad?** Maybe the label should be used in which case there is
/// an error in the code or it should be removed.
///
/// **Known problems:** Hopefully none.
///
/// **Example:**
/// ```rust,ignore
/// fn unused_label() {
/// 'label: for i in 1..2 {
/// if i > 4 { continue }
/// }
/// ```
pub UNUSED_LABEL,
complexity,
"unused labels"
}
struct UnusedLabelVisitor<'a, 'tcx> {
labels: FxHashMap<Symbol, Span>,
cx: &'a LateContext<'a, 'tcx>,
}
declare_lint_pass!(UnusedLabel => [UNUSED_LABEL]);
impl<'a, 'tcx> LateLintPass<'a, 'tcx> for UnusedLabel {
fn check_fn(
&mut self,
cx: &LateContext<'a, 'tcx>,
kind: FnKind<'tcx>,
decl: &'tcx hir::FnDecl,
body: &'tcx hir::Body,
span: Span,
fn_id: hir::HirId,
) {
if span.from_expansion() {
return;
}
let mut v = UnusedLabelVisitor {
cx,
labels: FxHashMap::default(),
};
walk_fn(&mut v, kind, decl, body.id(), span, fn_id);
for (label, span) in v.labels {
span_lint(cx, UNUSED_LABEL, span, &format!("unused label `{}`", label));
}
}
}
impl<'a, 'tcx> Visitor<'tcx> for UnusedLabelVisitor<'a, 'tcx> {
fn visit_expr(&mut self, expr: &'tcx hir::Expr) {
match expr.kind {
hir::ExprKind::Break(destination, _) | hir::ExprKind::Continue(destination) => {
if let Some(label) = destination.label {
self.labels.remove(&label.ident.name);
}
},
hir::ExprKind::Loop(_, Some(label), _) => {
self.labels.insert(label.ident.name, expr.span);
},
_ => (),
}
walk_expr(self, expr);
}
fn nested_visit_map<'this>(&'this mut self) -> NestedVisitorMap<'this, 'tcx> {
NestedVisitorMap::All(&self.cx.tcx.hir())
}
}