summaryrefslogtreecommitdiffstats
path: root/compiler/rustc_lint/src/levels.rs
diff options
context:
space:
mode:
Diffstat (limited to 'compiler/rustc_lint/src/levels.rs')
-rw-r--r--compiler/rustc_lint/src/levels.rs813
1 files changed, 813 insertions, 0 deletions
diff --git a/compiler/rustc_lint/src/levels.rs b/compiler/rustc_lint/src/levels.rs
new file mode 100644
index 000000000..00e96f20d
--- /dev/null
+++ b/compiler/rustc_lint/src/levels.rs
@@ -0,0 +1,813 @@
+use crate::context::{CheckLintNameResult, LintStore};
+use crate::late::unerased_lint_store;
+use rustc_ast as ast;
+use rustc_ast_pretty::pprust;
+use rustc_data_structures::fx::FxHashMap;
+use rustc_errors::{struct_span_err, Applicability, Diagnostic, LintDiagnosticBuilder, MultiSpan};
+use rustc_hir as hir;
+use rustc_hir::{intravisit, HirId};
+use rustc_middle::hir::nested_filter;
+use rustc_middle::lint::{
+ struct_lint_level, LevelAndSource, LintExpectation, LintLevelMap, LintLevelSets,
+ LintLevelSource, LintSet, LintStackIndex, COMMAND_LINE,
+};
+use rustc_middle::ty::query::Providers;
+use rustc_middle::ty::{RegisteredTools, TyCtxt};
+use rustc_session::lint::{
+ builtin::{self, FORBIDDEN_LINT_GROUPS, SINGLE_USE_LIFETIMES, UNFULFILLED_LINT_EXPECTATIONS},
+ Level, Lint, LintExpectationId, LintId,
+};
+use rustc_session::parse::{add_feature_diagnostics, feature_err};
+use rustc_session::Session;
+use rustc_span::symbol::{sym, Symbol};
+use rustc_span::{Span, DUMMY_SP};
+use tracing::debug;
+
+fn lint_levels(tcx: TyCtxt<'_>, (): ()) -> LintLevelMap {
+ let store = unerased_lint_store(tcx);
+ let levels =
+ LintLevelsBuilder::new(tcx.sess, false, &store, &tcx.resolutions(()).registered_tools);
+ let mut builder = LintLevelMapBuilder { levels, tcx };
+ let krate = tcx.hir().krate();
+
+ builder.levels.id_to_set.reserve(krate.owners.len() + 1);
+
+ let push =
+ builder.levels.push(tcx.hir().attrs(hir::CRATE_HIR_ID), true, Some(hir::CRATE_HIR_ID));
+
+ builder.levels.register_id(hir::CRATE_HIR_ID);
+ tcx.hir().walk_toplevel_module(&mut builder);
+ builder.levels.pop(push);
+
+ builder.levels.update_unstable_expectation_ids();
+ builder.levels.build_map()
+}
+
+pub struct LintLevelsBuilder<'s> {
+ sess: &'s Session,
+ lint_expectations: Vec<(LintExpectationId, LintExpectation)>,
+ /// Each expectation has a stable and an unstable identifier. This map
+ /// is used to map from unstable to stable [`LintExpectationId`]s.
+ expectation_id_map: FxHashMap<LintExpectationId, LintExpectationId>,
+ sets: LintLevelSets,
+ id_to_set: FxHashMap<HirId, LintStackIndex>,
+ cur: LintStackIndex,
+ warn_about_weird_lints: bool,
+ store: &'s LintStore,
+ registered_tools: &'s RegisteredTools,
+}
+
+pub struct BuilderPush {
+ prev: LintStackIndex,
+ pub changed: bool,
+}
+
+impl<'s> LintLevelsBuilder<'s> {
+ pub fn new(
+ sess: &'s Session,
+ warn_about_weird_lints: bool,
+ store: &'s LintStore,
+ registered_tools: &'s RegisteredTools,
+ ) -> Self {
+ let mut builder = LintLevelsBuilder {
+ sess,
+ lint_expectations: Default::default(),
+ expectation_id_map: Default::default(),
+ sets: LintLevelSets::new(),
+ cur: COMMAND_LINE,
+ id_to_set: Default::default(),
+ warn_about_weird_lints,
+ store,
+ registered_tools,
+ };
+ builder.process_command_line(sess, store);
+ assert_eq!(builder.sets.list.len(), 1);
+ builder
+ }
+
+ pub(crate) fn sess(&self) -> &Session {
+ self.sess
+ }
+
+ pub(crate) fn lint_store(&self) -> &LintStore {
+ self.store
+ }
+
+ fn current_specs(&self) -> &FxHashMap<LintId, LevelAndSource> {
+ &self.sets.list[self.cur].specs
+ }
+
+ fn current_specs_mut(&mut self) -> &mut FxHashMap<LintId, LevelAndSource> {
+ &mut self.sets.list[self.cur].specs
+ }
+
+ fn process_command_line(&mut self, sess: &Session, store: &LintStore) {
+ self.sets.lint_cap = sess.opts.lint_cap.unwrap_or(Level::Forbid);
+
+ self.cur =
+ self.sets.list.push(LintSet { specs: FxHashMap::default(), parent: COMMAND_LINE });
+ for &(ref lint_name, level) in &sess.opts.lint_opts {
+ store.check_lint_name_cmdline(sess, &lint_name, level, self.registered_tools);
+ let orig_level = level;
+ let lint_flag_val = Symbol::intern(lint_name);
+
+ let Ok(ids) = store.find_lints(&lint_name) else {
+ // errors handled in check_lint_name_cmdline above
+ continue
+ };
+ for id in ids {
+ // ForceWarn and Forbid cannot be overridden
+ if let Some((Level::ForceWarn(_) | Level::Forbid, _)) =
+ self.current_specs().get(&id)
+ {
+ continue;
+ }
+
+ if self.check_gated_lint(id, DUMMY_SP) {
+ let src = LintLevelSource::CommandLine(lint_flag_val, orig_level);
+ self.current_specs_mut().insert(id, (level, src));
+ }
+ }
+ }
+ }
+
+ /// Attempts to insert the `id` to `level_src` map entry. If unsuccessful
+ /// (e.g. if a forbid was already inserted on the same scope), then emits a
+ /// diagnostic with no change to `specs`.
+ fn insert_spec(&mut self, id: LintId, (level, src): LevelAndSource) {
+ let (old_level, old_src) =
+ self.sets.get_lint_level(id.lint, self.cur, Some(self.current_specs()), &self.sess);
+ // Setting to a non-forbid level is an error if the lint previously had
+ // a forbid level. Note that this is not necessarily true even with a
+ // `#[forbid(..)]` attribute present, as that is overridden by `--cap-lints`.
+ //
+ // This means that this only errors if we're truly lowering the lint
+ // level from forbid.
+ if level != Level::Forbid {
+ if let Level::Forbid = old_level {
+ // Backwards compatibility check:
+ //
+ // We used to not consider `forbid(lint_group)`
+ // as preventing `allow(lint)` for some lint `lint` in
+ // `lint_group`. For now, issue a future-compatibility
+ // warning for this case.
+ let id_name = id.lint.name_lower();
+ let fcw_warning = match old_src {
+ LintLevelSource::Default => false,
+ LintLevelSource::Node(symbol, _, _) => self.store.is_lint_group(symbol),
+ LintLevelSource::CommandLine(symbol, _) => self.store.is_lint_group(symbol),
+ };
+ debug!(
+ "fcw_warning={:?}, specs.get(&id) = {:?}, old_src={:?}, id_name={:?}",
+ fcw_warning,
+ self.current_specs(),
+ old_src,
+ id_name
+ );
+
+ let decorate_diag = |diag: &mut Diagnostic| {
+ diag.span_label(src.span(), "overruled by previous forbid");
+ match old_src {
+ LintLevelSource::Default => {
+ diag.note(&format!(
+ "`forbid` lint level is the default for {}",
+ id.to_string()
+ ));
+ }
+ LintLevelSource::Node(_, forbid_source_span, reason) => {
+ diag.span_label(forbid_source_span, "`forbid` level set here");
+ if let Some(rationale) = reason {
+ diag.note(rationale.as_str());
+ }
+ }
+ LintLevelSource::CommandLine(_, _) => {
+ diag.note("`forbid` lint level was set on command line");
+ }
+ }
+ };
+ if !fcw_warning {
+ let mut diag_builder = struct_span_err!(
+ self.sess,
+ src.span(),
+ E0453,
+ "{}({}) incompatible with previous forbid",
+ level.as_str(),
+ src.name(),
+ );
+ decorate_diag(&mut diag_builder);
+ diag_builder.emit();
+ } else {
+ self.struct_lint(
+ FORBIDDEN_LINT_GROUPS,
+ Some(src.span().into()),
+ |diag_builder| {
+ let mut diag_builder = diag_builder.build(&format!(
+ "{}({}) incompatible with previous forbid",
+ level.as_str(),
+ src.name(),
+ ));
+ decorate_diag(&mut diag_builder);
+ diag_builder.emit();
+ },
+ );
+ }
+
+ // Retain the forbid lint level, unless we are
+ // issuing a FCW. In the FCW case, we want to
+ // respect the new setting.
+ if !fcw_warning {
+ return;
+ }
+ }
+ }
+
+ // The lint `unfulfilled_lint_expectations` can't be expected, as it would suppress itself.
+ // Handling expectations of this lint would add additional complexity with little to no
+ // benefit. The expect level for this lint will therefore be ignored.
+ if let Level::Expect(_) = level && id == LintId::of(UNFULFILLED_LINT_EXPECTATIONS) {
+ return;
+ }
+
+ match (old_level, level) {
+ // If the new level is an expectation store it in `ForceWarn`
+ (Level::ForceWarn(_), Level::Expect(expectation_id)) => self
+ .current_specs_mut()
+ .insert(id, (Level::ForceWarn(Some(expectation_id)), old_src)),
+ // Keep `ForceWarn` level but drop the expectation
+ (Level::ForceWarn(_), _) => {
+ self.current_specs_mut().insert(id, (Level::ForceWarn(None), old_src))
+ }
+ // Set the lint level as normal
+ _ => self.current_specs_mut().insert(id, (level, src)),
+ };
+ }
+
+ /// Pushes a list of AST lint attributes onto this context.
+ ///
+ /// This function will return a `BuilderPush` object which should be passed
+ /// to `pop` when this scope for the attributes provided is exited.
+ ///
+ /// This function will perform a number of tasks:
+ ///
+ /// * It'll validate all lint-related attributes in `attrs`
+ /// * It'll mark all lint-related attributes as used
+ /// * Lint levels will be updated based on the attributes provided
+ /// * Lint attributes are validated, e.g., a `#[forbid]` can't be switched to
+ /// `#[allow]`
+ ///
+ /// Don't forget to call `pop`!
+ pub(crate) fn push(
+ &mut self,
+ attrs: &[ast::Attribute],
+ is_crate_node: bool,
+ source_hir_id: Option<HirId>,
+ ) -> BuilderPush {
+ let prev = self.cur;
+ self.cur = self.sets.list.push(LintSet { specs: FxHashMap::default(), parent: prev });
+
+ let sess = self.sess;
+ let bad_attr = |span| struct_span_err!(sess, span, E0452, "malformed lint attribute input");
+ for (attr_index, attr) in attrs.iter().enumerate() {
+ if attr.has_name(sym::automatically_derived) {
+ self.current_specs_mut().insert(
+ LintId::of(SINGLE_USE_LIFETIMES),
+ (Level::Allow, LintLevelSource::Default),
+ );
+ continue;
+ }
+
+ let level = match Level::from_attr(attr) {
+ None => continue,
+ // This is the only lint level with a `LintExpectationId` that can be created from an attribute
+ Some(Level::Expect(unstable_id)) if let Some(hir_id) = source_hir_id => {
+ let stable_id = self.create_stable_id(unstable_id, hir_id, attr_index);
+
+ Level::Expect(stable_id)
+ }
+ Some(lvl) => lvl,
+ };
+
+ let Some(mut metas) = attr.meta_item_list() else {
+ continue
+ };
+
+ if metas.is_empty() {
+ // This emits the unused_attributes lint for `#[level()]`
+ continue;
+ }
+
+ // Before processing the lint names, look for a reason (RFC 2383)
+ // at the end.
+ let mut reason = None;
+ let tail_li = &metas[metas.len() - 1];
+ if let Some(item) = tail_li.meta_item() {
+ match item.kind {
+ ast::MetaItemKind::Word => {} // actual lint names handled later
+ ast::MetaItemKind::NameValue(ref name_value) => {
+ if item.path == sym::reason {
+ if let ast::LitKind::Str(rationale, _) = name_value.kind {
+ if !self.sess.features_untracked().lint_reasons {
+ feature_err(
+ &self.sess.parse_sess,
+ sym::lint_reasons,
+ item.span,
+ "lint reasons are experimental",
+ )
+ .emit();
+ }
+ reason = Some(rationale);
+ } else {
+ bad_attr(name_value.span)
+ .span_label(name_value.span, "reason must be a string literal")
+ .emit();
+ }
+ // found reason, reslice meta list to exclude it
+ metas.pop().unwrap();
+ } else {
+ bad_attr(item.span)
+ .span_label(item.span, "bad attribute argument")
+ .emit();
+ }
+ }
+ ast::MetaItemKind::List(_) => {
+ bad_attr(item.span).span_label(item.span, "bad attribute argument").emit();
+ }
+ }
+ }
+
+ for (lint_index, li) in metas.iter_mut().enumerate() {
+ let level = match level {
+ Level::Expect(mut id) => {
+ id.set_lint_index(Some(lint_index as u16));
+ Level::Expect(id)
+ }
+ level => level,
+ };
+
+ let sp = li.span();
+ let meta_item = match li {
+ ast::NestedMetaItem::MetaItem(meta_item) if meta_item.is_word() => meta_item,
+ _ => {
+ let mut err = bad_attr(sp);
+ let mut add_label = true;
+ if let Some(item) = li.meta_item() {
+ if let ast::MetaItemKind::NameValue(_) = item.kind {
+ if item.path == sym::reason {
+ err.span_label(sp, "reason in lint attribute must come last");
+ add_label = false;
+ }
+ }
+ }
+ if add_label {
+ err.span_label(sp, "bad attribute argument");
+ }
+ err.emit();
+ continue;
+ }
+ };
+ let tool_ident = if meta_item.path.segments.len() > 1 {
+ Some(meta_item.path.segments.remove(0).ident)
+ } else {
+ None
+ };
+ let tool_name = tool_ident.map(|ident| ident.name);
+ let name = pprust::path_to_string(&meta_item.path);
+ let lint_result =
+ self.store.check_lint_name(&name, tool_name, self.registered_tools);
+ match &lint_result {
+ CheckLintNameResult::Ok(ids) => {
+ // This checks for instances where the user writes `#[expect(unfulfilled_lint_expectations)]`
+ // in that case we want to avoid overriding the lint level but instead add an expectation that
+ // can't be fulfilled. The lint message will include an explanation, that the
+ // `unfulfilled_lint_expectations` lint can't be expected.
+ if let Level::Expect(expect_id) = level {
+ // The `unfulfilled_lint_expectations` lint is not part of any lint groups. Therefore. we
+ // only need to check the slice if it contains a single lint.
+ let is_unfulfilled_lint_expectations = match ids {
+ [lint] => *lint == LintId::of(UNFULFILLED_LINT_EXPECTATIONS),
+ _ => false,
+ };
+ self.lint_expectations.push((
+ expect_id,
+ LintExpectation::new(
+ reason,
+ sp,
+ is_unfulfilled_lint_expectations,
+ tool_name,
+ ),
+ ));
+ }
+ let src = LintLevelSource::Node(
+ meta_item.path.segments.last().expect("empty lint name").ident.name,
+ sp,
+ reason,
+ );
+ for &id in *ids {
+ if self.check_gated_lint(id, attr.span) {
+ self.insert_spec(id, (level, src));
+ }
+ }
+ }
+
+ CheckLintNameResult::Tool(result) => {
+ match *result {
+ Ok(ids) => {
+ let complete_name =
+ &format!("{}::{}", tool_ident.unwrap().name, name);
+ let src = LintLevelSource::Node(
+ Symbol::intern(complete_name),
+ sp,
+ reason,
+ );
+ for id in ids {
+ self.insert_spec(*id, (level, src));
+ }
+ if let Level::Expect(expect_id) = level {
+ self.lint_expectations.push((
+ expect_id,
+ LintExpectation::new(reason, sp, false, tool_name),
+ ));
+ }
+ }
+ Err((Some(ids), ref new_lint_name)) => {
+ let lint = builtin::RENAMED_AND_REMOVED_LINTS;
+ let (lvl, src) = self.sets.get_lint_level(
+ lint,
+ self.cur,
+ Some(self.current_specs()),
+ &sess,
+ );
+ struct_lint_level(
+ self.sess,
+ lint,
+ lvl,
+ src,
+ Some(sp.into()),
+ |lint| {
+ let msg = format!(
+ "lint name `{}` is deprecated \
+ and may not have an effect in the future.",
+ name
+ );
+ lint.build(&msg)
+ .span_suggestion(
+ sp,
+ "change it to",
+ new_lint_name,
+ Applicability::MachineApplicable,
+ )
+ .emit();
+ },
+ );
+
+ let src = LintLevelSource::Node(
+ Symbol::intern(&new_lint_name),
+ sp,
+ reason,
+ );
+ for id in ids {
+ self.insert_spec(*id, (level, src));
+ }
+ if let Level::Expect(expect_id) = level {
+ self.lint_expectations.push((
+ expect_id,
+ LintExpectation::new(reason, sp, false, tool_name),
+ ));
+ }
+ }
+ Err((None, _)) => {
+ // If Tool(Err(None, _)) is returned, then either the lint does not
+ // exist in the tool or the code was not compiled with the tool and
+ // therefore the lint was never added to the `LintStore`. To detect
+ // this is the responsibility of the lint tool.
+ }
+ }
+ }
+
+ &CheckLintNameResult::NoTool => {
+ let mut err = struct_span_err!(
+ sess,
+ tool_ident.map_or(DUMMY_SP, |ident| ident.span),
+ E0710,
+ "unknown tool name `{}` found in scoped lint: `{}::{}`",
+ tool_name.unwrap(),
+ tool_name.unwrap(),
+ pprust::path_to_string(&meta_item.path),
+ );
+ if sess.is_nightly_build() {
+ err.help(&format!(
+ "add `#![register_tool({})]` to the crate root",
+ tool_name.unwrap()
+ ));
+ }
+ err.emit();
+ continue;
+ }
+
+ _ if !self.warn_about_weird_lints => {}
+
+ CheckLintNameResult::Warning(msg, renamed) => {
+ let lint = builtin::RENAMED_AND_REMOVED_LINTS;
+ let (renamed_lint_level, src) = self.sets.get_lint_level(
+ lint,
+ self.cur,
+ Some(self.current_specs()),
+ &sess,
+ );
+ struct_lint_level(
+ self.sess,
+ lint,
+ renamed_lint_level,
+ src,
+ Some(sp.into()),
+ |lint| {
+ let mut err = lint.build(msg);
+ if let Some(new_name) = &renamed {
+ err.span_suggestion(
+ sp,
+ "use the new name",
+ new_name,
+ Applicability::MachineApplicable,
+ );
+ }
+ err.emit();
+ },
+ );
+ }
+ CheckLintNameResult::NoLint(suggestion) => {
+ let lint = builtin::UNKNOWN_LINTS;
+ let (level, src) = self.sets.get_lint_level(
+ lint,
+ self.cur,
+ Some(self.current_specs()),
+ self.sess,
+ );
+ struct_lint_level(self.sess, lint, level, src, Some(sp.into()), |lint| {
+ let name = if let Some(tool_ident) = tool_ident {
+ format!("{}::{}", tool_ident.name, name)
+ } else {
+ name.to_string()
+ };
+ let mut db = lint.build(format!("unknown lint: `{}`", name));
+ if let Some(suggestion) = suggestion {
+ db.span_suggestion(
+ sp,
+ "did you mean",
+ suggestion,
+ Applicability::MachineApplicable,
+ );
+ }
+ db.emit();
+ });
+ }
+ }
+ // If this lint was renamed, apply the new lint instead of ignoring the attribute.
+ // This happens outside of the match because the new lint should be applied even if
+ // we don't warn about the name change.
+ if let CheckLintNameResult::Warning(_, Some(new_name)) = lint_result {
+ // Ignore any errors or warnings that happen because the new name is inaccurate
+ // NOTE: `new_name` already includes the tool name, so we don't have to add it again.
+ if let CheckLintNameResult::Ok(ids) =
+ self.store.check_lint_name(&new_name, None, self.registered_tools)
+ {
+ let src = LintLevelSource::Node(Symbol::intern(&new_name), sp, reason);
+ for &id in ids {
+ if self.check_gated_lint(id, attr.span) {
+ self.insert_spec(id, (level, src));
+ }
+ }
+ if let Level::Expect(expect_id) = level {
+ self.lint_expectations.push((
+ expect_id,
+ LintExpectation::new(reason, sp, false, tool_name),
+ ));
+ }
+ } else {
+ panic!("renamed lint does not exist: {}", new_name);
+ }
+ }
+ }
+ }
+
+ if !is_crate_node {
+ for (id, &(level, ref src)) in self.current_specs().iter() {
+ if !id.lint.crate_level_only {
+ continue;
+ }
+
+ let LintLevelSource::Node(lint_attr_name, lint_attr_span, _) = *src else {
+ continue
+ };
+
+ let lint = builtin::UNUSED_ATTRIBUTES;
+ let (lint_level, lint_src) =
+ self.sets.get_lint_level(lint, self.cur, Some(self.current_specs()), self.sess);
+ struct_lint_level(
+ self.sess,
+ lint,
+ lint_level,
+ lint_src,
+ Some(lint_attr_span.into()),
+ |lint| {
+ let mut db = lint.build(&format!(
+ "{}({}) is ignored unless specified at crate level",
+ level.as_str(),
+ lint_attr_name
+ ));
+ db.emit();
+ },
+ );
+ // don't set a separate error for every lint in the group
+ break;
+ }
+ }
+
+ if self.current_specs().is_empty() {
+ self.sets.list.pop();
+ self.cur = prev;
+ }
+
+ BuilderPush { prev, changed: prev != self.cur }
+ }
+
+ fn create_stable_id(
+ &mut self,
+ unstable_id: LintExpectationId,
+ hir_id: HirId,
+ attr_index: usize,
+ ) -> LintExpectationId {
+ let stable_id =
+ LintExpectationId::Stable { hir_id, attr_index: attr_index as u16, lint_index: None };
+
+ self.expectation_id_map.insert(unstable_id, stable_id);
+
+ stable_id
+ }
+
+ /// Checks if the lint is gated on a feature that is not enabled.
+ ///
+ /// Returns `true` if the lint's feature is enabled.
+ fn check_gated_lint(&self, lint_id: LintId, span: Span) -> bool {
+ if let Some(feature) = lint_id.lint.feature_gate {
+ if !self.sess.features_untracked().enabled(feature) {
+ let lint = builtin::UNKNOWN_LINTS;
+ let (level, src) = self.lint_level(builtin::UNKNOWN_LINTS);
+ struct_lint_level(self.sess, lint, level, src, Some(span.into()), |lint_db| {
+ let mut db =
+ lint_db.build(&format!("unknown lint: `{}`", lint_id.lint.name_lower()));
+ db.note(&format!("the `{}` lint is unstable", lint_id.lint.name_lower(),));
+ add_feature_diagnostics(&mut db, &self.sess.parse_sess, feature);
+ db.emit();
+ });
+ return false;
+ }
+ }
+ true
+ }
+
+ /// Called after `push` when the scope of a set of attributes are exited.
+ pub fn pop(&mut self, push: BuilderPush) {
+ self.cur = push.prev;
+ }
+
+ /// Find the lint level for a lint.
+ pub fn lint_level(&self, lint: &'static Lint) -> (Level, LintLevelSource) {
+ self.sets.get_lint_level(lint, self.cur, None, self.sess)
+ }
+
+ /// Used to emit a lint-related diagnostic based on the current state of
+ /// this lint context.
+ pub fn struct_lint(
+ &self,
+ lint: &'static Lint,
+ span: Option<MultiSpan>,
+ decorate: impl for<'a> FnOnce(LintDiagnosticBuilder<'a, ()>),
+ ) {
+ let (level, src) = self.lint_level(lint);
+ struct_lint_level(self.sess, lint, level, src, span, decorate)
+ }
+
+ /// Registers the ID provided with the current set of lints stored in
+ /// this context.
+ pub fn register_id(&mut self, id: HirId) {
+ self.id_to_set.insert(id, self.cur);
+ }
+
+ fn update_unstable_expectation_ids(&self) {
+ self.sess.diagnostic().update_unstable_expectation_id(&self.expectation_id_map);
+ }
+
+ pub fn build_map(self) -> LintLevelMap {
+ LintLevelMap {
+ sets: self.sets,
+ id_to_set: self.id_to_set,
+ lint_expectations: self.lint_expectations,
+ }
+ }
+}
+
+struct LintLevelMapBuilder<'tcx> {
+ levels: LintLevelsBuilder<'tcx>,
+ tcx: TyCtxt<'tcx>,
+}
+
+impl LintLevelMapBuilder<'_> {
+ fn with_lint_attrs<F>(&mut self, id: hir::HirId, f: F)
+ where
+ F: FnOnce(&mut Self),
+ {
+ let is_crate_hir = id == hir::CRATE_HIR_ID;
+ let attrs = self.tcx.hir().attrs(id);
+ let push = self.levels.push(attrs, is_crate_hir, Some(id));
+
+ if push.changed {
+ self.levels.register_id(id);
+ }
+ f(self);
+ self.levels.pop(push);
+ }
+}
+
+impl<'tcx> intravisit::Visitor<'tcx> for LintLevelMapBuilder<'tcx> {
+ type NestedFilter = nested_filter::All;
+
+ fn nested_visit_map(&mut self) -> Self::Map {
+ self.tcx.hir()
+ }
+
+ fn visit_param(&mut self, param: &'tcx hir::Param<'tcx>) {
+ self.with_lint_attrs(param.hir_id, |builder| {
+ intravisit::walk_param(builder, param);
+ });
+ }
+
+ fn visit_item(&mut self, it: &'tcx hir::Item<'tcx>) {
+ self.with_lint_attrs(it.hir_id(), |builder| {
+ intravisit::walk_item(builder, it);
+ });
+ }
+
+ fn visit_foreign_item(&mut self, it: &'tcx hir::ForeignItem<'tcx>) {
+ self.with_lint_attrs(it.hir_id(), |builder| {
+ intravisit::walk_foreign_item(builder, it);
+ })
+ }
+
+ fn visit_stmt(&mut self, e: &'tcx hir::Stmt<'tcx>) {
+ // We will call `with_lint_attrs` when we walk
+ // the `StmtKind`. The outer statement itself doesn't
+ // define the lint levels.
+ intravisit::walk_stmt(self, e);
+ }
+
+ fn visit_expr(&mut self, e: &'tcx hir::Expr<'tcx>) {
+ self.with_lint_attrs(e.hir_id, |builder| {
+ intravisit::walk_expr(builder, e);
+ })
+ }
+
+ fn visit_field_def(&mut self, s: &'tcx hir::FieldDef<'tcx>) {
+ self.with_lint_attrs(s.hir_id, |builder| {
+ intravisit::walk_field_def(builder, s);
+ })
+ }
+
+ fn visit_variant(
+ &mut self,
+ v: &'tcx hir::Variant<'tcx>,
+ g: &'tcx hir::Generics<'tcx>,
+ item_id: hir::HirId,
+ ) {
+ self.with_lint_attrs(v.id, |builder| {
+ intravisit::walk_variant(builder, v, g, item_id);
+ })
+ }
+
+ fn visit_local(&mut self, l: &'tcx hir::Local<'tcx>) {
+ self.with_lint_attrs(l.hir_id, |builder| {
+ intravisit::walk_local(builder, l);
+ })
+ }
+
+ fn visit_arm(&mut self, a: &'tcx hir::Arm<'tcx>) {
+ self.with_lint_attrs(a.hir_id, |builder| {
+ intravisit::walk_arm(builder, a);
+ })
+ }
+
+ fn visit_trait_item(&mut self, trait_item: &'tcx hir::TraitItem<'tcx>) {
+ self.with_lint_attrs(trait_item.hir_id(), |builder| {
+ intravisit::walk_trait_item(builder, trait_item);
+ });
+ }
+
+ fn visit_impl_item(&mut self, impl_item: &'tcx hir::ImplItem<'tcx>) {
+ self.with_lint_attrs(impl_item.hir_id(), |builder| {
+ intravisit::walk_impl_item(builder, impl_item);
+ });
+ }
+}
+
+pub fn provide(providers: &mut Providers) {
+ providers.lint_levels = lint_levels;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-12 02:34:32 +0000