Various style improvements to rustc_lint::levels
- Replace some nested if-let with let-chains
- Tweak a match pattern to allow shorthand struct syntax
- Fuse an `is_empty` check with getting the last element
- Merge some common code that emits `MalformedAttribute` and continues
- Format `"{tool}::{name}"` in a way that's consistent with other match arms
- Replace if-let-else-panic with let-else
- Use early-exit to flatten a method body
This commit is contained in:
Zalathar
parent
e61dcc7a0a
commit
f2fcfe82af
@ -103,11 +103,12 @@ fn raw_lint_id_level(
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mut idx: LintStackIndex,
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aux: Option<&FxIndexMap<LintId, LevelAndSource>>,
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) -> (Option<Level>, LintLevelSource) {
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if let Some(specs) = aux {
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if let Some(&(level, src)) = specs.get(&id) {
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return (Some(level), src);
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}
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if let Some(specs) = aux
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&& let Some(&(level, src)) = specs.get(&id)
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{
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return (Some(level), src);
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}
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loop {
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let LintSet { ref specs, parent } = self.list[idx];
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if let Some(&(level, src)) = specs.get(&id) {
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@ -177,7 +178,7 @@ fn shallow_lint_levels_on(tcx: TyCtxt<'_>, owner: hir::OwnerId) -> ShallowLintLe
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// There is only something to do if there are attributes at all.
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[] => {}
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// Most of the time, there is only one attribute. Avoid fetching HIR in that case.
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[(local_id, _)] => levels.add_id(HirId { owner, local_id: *local_id }),
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&[(local_id, _)] => levels.add_id(HirId { owner, local_id }),
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// Otherwise, we need to visit the attributes in source code order, so we fetch HIR and do
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// a standard visit.
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// FIXME(#102522) Just iterate on attrs once that iteration order matches HIR's.
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@ -643,63 +644,61 @@ fn insert_spec(&mut self, id: LintId, (mut level, src): LevelAndSource) {
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//
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// This means that this only errors if we're truly lowering the lint
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// level from forbid.
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if self.lint_added_lints && level != Level::Forbid {
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if let Level::Forbid = old_level {
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// Backwards compatibility check:
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//
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// We used to not consider `forbid(lint_group)`
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// as preventing `allow(lint)` for some lint `lint` in
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// `lint_group`. For now, issue a future-compatibility
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// warning for this case.
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let id_name = id.lint.name_lower();
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let fcw_warning = match old_src {
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LintLevelSource::Default => false,
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LintLevelSource::Node { name, .. } => self.store.is_lint_group(name),
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LintLevelSource::CommandLine(symbol, _) => self.store.is_lint_group(symbol),
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};
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debug!(
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"fcw_warning={:?}, specs.get(&id) = {:?}, old_src={:?}, id_name={:?}",
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fcw_warning,
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self.current_specs(),
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old_src,
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id_name
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);
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let sub = match old_src {
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LintLevelSource::Default => {
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OverruledAttributeSub::DefaultSource { id: id.to_string() }
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}
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LintLevelSource::Node { span, reason, .. } => {
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OverruledAttributeSub::NodeSource { span, reason }
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}
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LintLevelSource::CommandLine(_, _) => OverruledAttributeSub::CommandLineSource,
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};
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if !fcw_warning {
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self.sess.dcx().emit_err(OverruledAttribute {
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span: src.span(),
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if self.lint_added_lints && level != Level::Forbid && old_level == Level::Forbid {
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// Backwards compatibility check:
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//
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// We used to not consider `forbid(lint_group)`
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// as preventing `allow(lint)` for some lint `lint` in
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// `lint_group`. For now, issue a future-compatibility
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// warning for this case.
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let id_name = id.lint.name_lower();
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let fcw_warning = match old_src {
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LintLevelSource::Default => false,
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LintLevelSource::Node { name, .. } => self.store.is_lint_group(name),
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LintLevelSource::CommandLine(symbol, _) => self.store.is_lint_group(symbol),
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};
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debug!(
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"fcw_warning={:?}, specs.get(&id) = {:?}, old_src={:?}, id_name={:?}",
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fcw_warning,
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self.current_specs(),
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old_src,
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id_name
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);
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let sub = match old_src {
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LintLevelSource::Default => {
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OverruledAttributeSub::DefaultSource { id: id.to_string() }
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}
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LintLevelSource::Node { span, reason, .. } => {
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OverruledAttributeSub::NodeSource { span, reason }
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}
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LintLevelSource::CommandLine(_, _) => OverruledAttributeSub::CommandLineSource,
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};
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if !fcw_warning {
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self.sess.dcx().emit_err(OverruledAttribute {
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span: src.span(),
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overruled: src.span(),
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lint_level: level.as_str(),
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lint_source: src.name(),
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sub,
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});
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} else {
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self.emit_span_lint(
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FORBIDDEN_LINT_GROUPS,
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src.span().into(),
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OverruledAttributeLint {
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overruled: src.span(),
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lint_level: level.as_str(),
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lint_source: src.name(),
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sub,
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});
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} else {
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self.emit_span_lint(
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FORBIDDEN_LINT_GROUPS,
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src.span().into(),
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OverruledAttributeLint {
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overruled: src.span(),
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lint_level: level.as_str(),
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lint_source: src.name(),
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sub,
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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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// Retain the forbid lint level, unless we are
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// issuing a FCW. In the FCW case, we want to
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// respect the new setting.
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if !fcw_warning {
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return;
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}
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// Retain the forbid lint level, unless we are
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// issuing a FCW. In the FCW case, we want to
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// respect the new setting.
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if !fcw_warning {
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return;
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}
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}
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@ -770,15 +769,15 @@ fn add(&mut self, attrs: &[ast::Attribute], is_crate_node: bool, source_hir_id:
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let Some(mut metas) = attr.meta_item_list() else { continue };
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if metas.is_empty() {
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// Check whether `metas` is empty, and get its last element.
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let Some(tail_li) = metas.last() else {
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// This emits the unused_attributes lint for `#[level()]`
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continue;
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}
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};
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// Before processing the lint names, look for a reason (RFC 2383)
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// at the end.
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let mut reason = None;
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let tail_li = &metas[metas.len() - 1];
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if let Some(item) = tail_li.meta_item() {
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match item.kind {
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ast::MetaItemKind::Word => {} // actual lint names handled later
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@ -834,21 +833,16 @@ fn add(&mut self, attrs: &[ast::Attribute], is_crate_node: bool, source_hir_id:
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let meta_item = match li {
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ast::NestedMetaItem::MetaItem(meta_item) if meta_item.is_word() => meta_item,
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_ => {
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if let Some(item) = li.meta_item() {
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if let ast::MetaItemKind::NameValue(_) = item.kind {
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if item.path == sym::reason {
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sess.dcx().emit_err(MalformedAttribute {
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span: sp,
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sub: MalformedAttributeSub::ReasonMustComeLast(sp),
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});
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continue;
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}
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}
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}
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sess.dcx().emit_err(MalformedAttribute {
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span: sp,
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sub: MalformedAttributeSub::BadAttributeArgument(sp),
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});
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let sub = if let Some(item) = li.meta_item()
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&& let ast::MetaItemKind::NameValue(_) = item.kind
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&& item.path == sym::reason
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{
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MalformedAttributeSub::ReasonMustComeLast(sp)
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} else {
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MalformedAttributeSub::BadAttributeArgument(sp)
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};
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sess.dcx().emit_err(MalformedAttribute { span: sp, sub });
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continue;
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}
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};
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@ -987,11 +981,7 @@ fn add(&mut self, attrs: &[ast::Attribute], is_crate_node: bool, source_hir_id:
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}
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CheckLintNameResult::NoLint(suggestion) => {
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let name = if let Some(tool_ident) = tool_ident {
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format!("{}::{}", tool_ident.name, name)
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} else {
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name.to_string()
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};
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let name = tool_ident.map(|tool| format!("{tool}::{name}")).unwrap_or(name);
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let suggestion = suggestion.map(|(replace, from_rustc)| {
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UnknownLintSuggestion::WithSpan { suggestion: sp, replace, from_rustc }
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});
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@ -1005,27 +995,24 @@ fn add(&mut self, attrs: &[ast::Attribute], is_crate_node: bool, source_hir_id:
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if let CheckLintNameResult::Renamed(new_name) = lint_result {
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// Ignore any errors or warnings that happen because the new name is inaccurate
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// NOTE: `new_name` already includes the tool name, so we don't have to add it again.
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if let CheckLintNameResult::Ok(ids) =
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let CheckLintNameResult::Ok(ids) =
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self.store.check_lint_name(&new_name, None, self.registered_tools)
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{
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let src = LintLevelSource::Node {
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name: Symbol::intern(&new_name),
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span: sp,
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reason,
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};
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for &id in ids {
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if self.check_gated_lint(id, attr.span, false) {
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self.insert_spec(id, (level, src));
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}
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}
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if let Level::Expect(expect_id) = level {
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self.provider.push_expectation(
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expect_id,
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LintExpectation::new(reason, sp, false, tool_name),
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);
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}
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} else {
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else {
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panic!("renamed lint does not exist: {new_name}");
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};
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let src =
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LintLevelSource::Node { name: Symbol::intern(&new_name), span: sp, reason };
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for &id in ids {
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if self.check_gated_lint(id, attr.span, false) {
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self.insert_spec(id, (level, src));
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}
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}
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if let Level::Expect(expect_id) = level {
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self.provider.push_expectation(
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expect_id,
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LintExpectation::new(reason, sp, false, tool_name),
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);
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}
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}
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}
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@ -1058,38 +1045,44 @@ fn add(&mut self, attrs: &[ast::Attribute], is_crate_node: bool, source_hir_id:
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/// Returns `true` if the lint's feature is enabled.
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#[track_caller]
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fn check_gated_lint(&self, lint_id: LintId, span: Span, lint_from_cli: bool) -> bool {
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if let Some(feature) = lint_id.lint.feature_gate {
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if !self.features.active(feature) {
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if self.lint_added_lints {
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let lint = builtin::UNKNOWN_LINTS;
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let (level, src) = self.lint_level(builtin::UNKNOWN_LINTS);
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// FIXME: make this translatable
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#[allow(rustc::diagnostic_outside_of_impl)]
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#[allow(rustc::untranslatable_diagnostic)]
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lint_level(
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self.sess,
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let feature = if let Some(feature) = lint_id.lint.feature_gate
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&& !self.features.active(feature)
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{
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// Lint is behind a feature that is not enabled; eventually return false.
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feature
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} else {
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// Lint is ungated or its feature is enabled; exit early.
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return true;
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};
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if self.lint_added_lints {
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let lint = builtin::UNKNOWN_LINTS;
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let (level, src) = self.lint_level(builtin::UNKNOWN_LINTS);
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// FIXME: make this translatable
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#[allow(rustc::diagnostic_outside_of_impl)]
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#[allow(rustc::untranslatable_diagnostic)]
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lint_level(
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self.sess,
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lint,
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level,
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src,
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Some(span.into()),
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fluent::lint_unknown_gated_lint,
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|lint| {
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lint.arg("name", lint_id.lint.name_lower());
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lint.note(fluent::lint_note);
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rustc_session::parse::add_feature_diagnostics_for_issue(
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lint,
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level,
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src,
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Some(span.into()),
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fluent::lint_unknown_gated_lint,
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|lint| {
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lint.arg("name", lint_id.lint.name_lower());
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lint.note(fluent::lint_note);
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rustc_session::parse::add_feature_diagnostics_for_issue(
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lint,
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&self.sess,
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feature,
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GateIssue::Language,
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lint_from_cli,
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);
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},
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&self.sess,
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feature,
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GateIssue::Language,
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lint_from_cli,
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);
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}
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return false;
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}
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},
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);
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}
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true
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false
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}
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/// Find the lint level for a lint.
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