diff --git a/compiler/rustc_errors/src/diagnostic.rs b/compiler/rustc_errors/src/diagnostic.rs index a52e95e92d5..1c440a0a07e 100644 --- a/compiler/rustc_errors/src/diagnostic.rs +++ b/compiler/rustc_errors/src/diagnostic.rs @@ -339,10 +339,9 @@ pub fn update_unstable_expectation_id( // The lint index inside the attribute is manually transferred here. let lint_index = expectation_id.get_lint_index(); expectation_id.set_lint_index(None); - let mut stable_id = unstable_to_stable + let mut stable_id = *unstable_to_stable .get(&expectation_id) - .expect("each unstable `LintExpectationId` must have a matching stable id") - .normalize(); + .expect("each unstable `LintExpectationId` must have a matching stable id"); stable_id.set_lint_index(lint_index); *expectation_id = stable_id; diff --git a/compiler/rustc_errors/src/lib.rs b/compiler/rustc_errors/src/lib.rs index 68971cebc35..b44cf352233 100644 --- a/compiler/rustc_errors/src/lib.rs +++ b/compiler/rustc_errors/src/lib.rs @@ -1205,7 +1205,7 @@ fn emit_diagnostic(&mut self, diagnostic: &mut Diagnostic) -> Option { /// Context for lint checking of the AST, after expansion, before lowering to HIR. pub struct EarlyContext<'a> { - pub builder: LintLevelsBuilder<'a, crate::levels::TopDown>, + pub builder: LintLevelsBuilder<'a>, pub buffered: LintBuffer, } diff --git a/compiler/rustc_lint/src/early.rs b/compiler/rustc_lint/src/early.rs index 45f54cfed2d..96ecd79a69c 100644 --- a/compiler/rustc_lint/src/early.rs +++ b/compiler/rustc_lint/src/early.rs @@ -59,7 +59,6 @@ fn with_lint_attrs(&mut self, id: ast::NodeId, attrs: &'a [ast::Attribute], f F: FnOnce(&mut Self), { let is_crate_node = id == ast::CRATE_NODE_ID; - debug!(?id); let push = self.context.builder.push(attrs, is_crate_node, None); self.check_id(id); diff --git a/compiler/rustc_lint/src/expect.rs b/compiler/rustc_lint/src/expect.rs index b9a3d52ca9b..699e8154318 100644 --- a/compiler/rustc_lint/src/expect.rs +++ b/compiler/rustc_lint/src/expect.rs @@ -16,10 +16,8 @@ fn check_expectations(tcx: TyCtxt<'_>, tool_filter: Option) { return; } - let lint_expectations = tcx.lint_expectations(()); let fulfilled_expectations = tcx.sess.diagnostic().steal_fulfilled_expectation_ids(); - - tracing::debug!(?lint_expectations, ?fulfilled_expectations); + let lint_expectations = &tcx.lint_levels(()).lint_expectations; for (id, expectation) in lint_expectations { // This check will always be true, since `lint_expectations` only diff --git a/compiler/rustc_lint/src/levels.rs b/compiler/rustc_lint/src/levels.rs index a9ba2ad1d10..1e16ac51e9e 100644 --- a/compiler/rustc_lint/src/levels.rs +++ b/compiler/rustc_lint/src/levels.rs @@ -6,11 +6,10 @@ use rustc_errors::{Applicability, Diagnostic, LintDiagnosticBuilder, MultiSpan}; use rustc_hir as hir; use rustc_hir::{intravisit, HirId}; -use rustc_index::vec::IndexVec; use rustc_middle::hir::nested_filter; use rustc_middle::lint::{ - reveal_actual_level, struct_lint_level, LevelAndSource, LintExpectation, LintLevelSource, - ShallowLintLevelMap, + struct_lint_level, LevelAndSource, LintExpectation, LintLevelMap, LintLevelSets, + LintLevelSource, LintSet, LintStackIndex, COMMAND_LINE, }; use rustc_middle::ty::query::Providers; use rustc_middle::ty::{RegisteredTools, TyCtxt}; @@ -28,292 +27,47 @@ UnknownToolInScopedLint, }; -/// Collection of lint levels for the whole crate. -/// This is used by AST-based lints, which do not -/// wait until we have built HIR to be emitted. -#[derive(Debug)] -struct LintLevelSets { - /// Linked list of specifications. - list: IndexVec, -} - -rustc_index::newtype_index! { - struct LintStackIndex { - ENCODABLE = custom, // we don't need encoding - const COMMAND_LINE = 0, - } -} - -/// Specifications found at this position in the stack. This map only represents the lints -/// found for one set of attributes (like `shallow_lint_levels_on` does). -/// -/// We store the level specifications as a linked list. -/// Each `LintSet` represents a set of attributes on the same AST node. -/// The `parent` forms a linked list that matches the AST tree. -/// This way, walking the linked list is equivalent to walking the AST bottom-up -/// to find the specifications for a given lint. -#[derive(Debug)] -struct LintSet { - // -A,-W,-D flags, a `Symbol` for the flag itself and `Level` for which - // flag. - specs: FxHashMap, - parent: LintStackIndex, -} - -impl LintLevelSets { - fn new() -> Self { - LintLevelSets { list: IndexVec::new() } - } - - fn get_lint_level( - &self, - lint: &'static Lint, - idx: LintStackIndex, - aux: Option<&FxHashMap>, - sess: &Session, - ) -> LevelAndSource { - let lint = LintId::of(lint); - let (level, mut src) = self.raw_lint_id_level(lint, idx, aux); - let level = reveal_actual_level(level, &mut src, sess, lint, |id| { - self.raw_lint_id_level(id, idx, aux) - }); - (level, src) - } - - fn raw_lint_id_level( - &self, - id: LintId, - mut idx: LintStackIndex, - aux: Option<&FxHashMap>, - ) -> (Option, LintLevelSource) { - if let Some(specs) = aux { - if let Some(&(level, src)) = specs.get(&id) { - return (Some(level), src); - } - } - loop { - let LintSet { ref specs, parent } = self.list[idx]; - if let Some(&(level, src)) = specs.get(&id) { - return (Some(level), src); - } - if idx == COMMAND_LINE { - return (None, LintLevelSource::Default); - } - idx = parent; - } - } -} - -fn lint_expectations(tcx: TyCtxt<'_>, (): ()) -> Vec<(LintExpectationId, LintExpectation)> { +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(); - let mut builder = LintLevelsBuilder { - sess: tcx.sess, - provider: QueryMapExpectationsWrapper { - tcx, - cur: hir::CRATE_HIR_ID, - specs: ShallowLintLevelMap::default(), - expectations: Vec::new(), - unstable_to_stable_ids: FxHashMap::default(), - }, - warn_about_weird_lints: false, - store, - registered_tools: &tcx.resolutions(()).registered_tools, - }; + builder.levels.id_to_set.reserve(krate.owners.len() + 1); - builder.add_command_line(); - builder.add_id(hir::CRATE_HIR_ID); + 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); - tcx.sess.diagnostic().update_unstable_expectation_id(&builder.provider.unstable_to_stable_ids); - - builder.provider.expectations + builder.levels.update_unstable_expectation_ids(); + builder.levels.build_map() } -fn shallow_lint_levels_on(tcx: TyCtxt<'_>, hir_id: HirId) -> ShallowLintLevelMap { - let store = unerased_lint_store(tcx); - - let mut levels = LintLevelsBuilder { - sess: tcx.sess, - provider: LintLevelQueryMap { tcx, cur: hir_id, specs: ShallowLintLevelMap::default() }, - warn_about_weird_lints: false, - store, - registered_tools: &tcx.resolutions(()).registered_tools, - }; - - let is_crate = hir::CRATE_HIR_ID == hir_id; - if is_crate { - levels.add_command_line(); - } - debug!(?hir_id); - levels.add(tcx.hir().attrs(hir_id), is_crate, Some(hir_id)); - - levels.provider.specs -} - -pub struct TopDown { - sets: LintLevelSets, - cur: LintStackIndex, -} - -pub trait LintLevelsProvider { - fn current_specs(&self) -> &FxHashMap; - fn current_specs_mut(&mut self) -> &mut FxHashMap; - fn get_lint_level(&self, lint: &'static Lint, sess: &Session) -> LevelAndSource; - fn push_expectation(&mut self, _id: LintExpectationId, _expectation: LintExpectation) {} -} - -impl LintLevelsProvider for TopDown { - fn current_specs(&self) -> &FxHashMap { - &self.sets.list[self.cur].specs - } - - fn current_specs_mut(&mut self) -> &mut FxHashMap { - &mut self.sets.list[self.cur].specs - } - - fn get_lint_level(&self, lint: &'static Lint, sess: &Session) -> LevelAndSource { - self.sets.get_lint_level(lint, self.cur, Some(self.current_specs()), sess) - } -} - -struct LintLevelQueryMap<'tcx> { - tcx: TyCtxt<'tcx>, - cur: HirId, - specs: ShallowLintLevelMap, -} - -impl LintLevelsProvider for LintLevelQueryMap<'_> { - fn current_specs(&self) -> &FxHashMap { - &self.specs.specs - } - fn current_specs_mut(&mut self) -> &mut FxHashMap { - &mut self.specs.specs - } - fn get_lint_level(&self, lint: &'static Lint, _: &Session) -> LevelAndSource { - self.specs.lint_level_id_at_node(self.tcx, LintId::of(lint), self.cur) - } -} - -struct QueryMapExpectationsWrapper<'tcx> { - tcx: TyCtxt<'tcx>, - cur: HirId, - specs: ShallowLintLevelMap, - expectations: Vec<(LintExpectationId, LintExpectation)>, - unstable_to_stable_ids: FxHashMap, -} - -impl LintLevelsProvider for QueryMapExpectationsWrapper<'_> { - fn current_specs(&self) -> &FxHashMap { - &self.specs.specs - } - fn current_specs_mut(&mut self) -> &mut FxHashMap { - self.specs.specs.clear(); - &mut self.specs.specs - } - fn get_lint_level(&self, lint: &'static Lint, _: &Session) -> LevelAndSource { - self.specs.lint_level_id_at_node(self.tcx, LintId::of(lint), self.cur) - } - fn push_expectation(&mut self, id: LintExpectationId, expectation: LintExpectation) { - let LintExpectationId::Stable { attr_id: Some(attr_id), hir_id, attr_index, .. } = id else { bug!("unstable expectation id should already be mapped") }; - let key = LintExpectationId::Unstable { attr_id, lint_index: None }; - - if !self.unstable_to_stable_ids.contains_key(&key) { - self.unstable_to_stable_ids.insert( - key, - LintExpectationId::Stable { hir_id, attr_index, lint_index: None, attr_id: None }, - ); - } - - self.expectations.push((id.normalize(), expectation)); - } -} - -impl<'tcx> LintLevelsBuilder<'_, QueryMapExpectationsWrapper<'tcx>> { - fn add_id(&mut self, hir_id: HirId) { - self.add(self.provider.tcx.hir().attrs(hir_id), hir_id == hir::CRATE_HIR_ID, Some(hir_id)); - } -} - -impl<'tcx> intravisit::Visitor<'tcx> for LintLevelsBuilder<'_, QueryMapExpectationsWrapper<'tcx>> { - type NestedFilter = nested_filter::All; - - fn nested_visit_map(&mut self) -> Self::Map { - self.provider.tcx.hir() - } - - fn visit_param(&mut self, param: &'tcx hir::Param<'tcx>) { - self.add_id(param.hir_id); - intravisit::walk_param(self, param); - } - - fn visit_item(&mut self, it: &'tcx hir::Item<'tcx>) { - self.add_id(it.hir_id()); - intravisit::walk_item(self, it); - } - - fn visit_foreign_item(&mut self, it: &'tcx hir::ForeignItem<'tcx>) { - self.add_id(it.hir_id()); - intravisit::walk_foreign_item(self, it); - } - - fn visit_stmt(&mut self, e: &'tcx hir::Stmt<'tcx>) { - // We will call `add_id` 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.add_id(e.hir_id); - intravisit::walk_expr(self, e); - } - - fn visit_field_def(&mut self, s: &'tcx hir::FieldDef<'tcx>) { - self.add_id(s.hir_id); - intravisit::walk_field_def(self, s); - } - - fn visit_variant(&mut self, v: &'tcx hir::Variant<'tcx>) { - self.add_id(v.id); - intravisit::walk_variant(self, v); - } - - fn visit_local(&mut self, l: &'tcx hir::Local<'tcx>) { - self.add_id(l.hir_id); - intravisit::walk_local(self, l); - } - - fn visit_arm(&mut self, a: &'tcx hir::Arm<'tcx>) { - self.add_id(a.hir_id); - intravisit::walk_arm(self, a); - } - - fn visit_trait_item(&mut self, trait_item: &'tcx hir::TraitItem<'tcx>) { - self.add_id(trait_item.hir_id()); - intravisit::walk_trait_item(self, trait_item); - } - - fn visit_impl_item(&mut self, impl_item: &'tcx hir::ImplItem<'tcx>) { - self.add_id(impl_item.hir_id()); - intravisit::walk_impl_item(self, impl_item); - } -} - -pub struct LintLevelsBuilder<'s, P> { +pub struct LintLevelsBuilder<'s> { sess: &'s Session, - provider: P, + 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, + sets: LintLevelSets, + id_to_set: FxHashMap, + cur: LintStackIndex, warn_about_weird_lints: bool, store: &'s LintStore, registered_tools: &'s RegisteredTools, } -pub(crate) struct BuilderPush { +pub struct BuilderPush { prev: LintStackIndex, + pub changed: bool, } -impl<'s> LintLevelsBuilder<'s, TopDown> { - pub(crate) fn new( +impl<'s> LintLevelsBuilder<'s> { + pub fn new( sess: &'s Session, warn_about_weird_lints: bool, store: &'s LintStore, @@ -321,66 +75,20 @@ pub(crate) fn new( ) -> Self { let mut builder = LintLevelsBuilder { sess, - provider: TopDown { sets: LintLevelSets::new(), cur: COMMAND_LINE }, + 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(); - assert_eq!(builder.provider.sets.list.len(), 1); + builder.process_command_line(sess, store); + assert_eq!(builder.sets.list.len(), 1); builder } - fn process_command_line(&mut self) { - self.provider.cur = self - .provider - .sets - .list - .push(LintSet { specs: FxHashMap::default(), parent: COMMAND_LINE }); - self.add_command_line(); - } - - /// 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, - ) -> BuilderPush { - let prev = self.provider.cur; - self.provider.cur = - self.provider.sets.list.push(LintSet { specs: FxHashMap::default(), parent: prev }); - - self.add(attrs, is_crate_node, source_hir_id); - - if self.provider.current_specs().is_empty() { - self.provider.sets.list.pop(); - self.provider.cur = prev; - } - - BuilderPush { prev } - } - - /// Called after `push` when the scope of a set of attributes are exited. - pub(crate) fn pop(&mut self, push: BuilderPush) { - self.provider.cur = push.prev; - } -} - -impl<'s, P: LintLevelsProvider> LintLevelsBuilder<'s, P> { pub(crate) fn sess(&self) -> &Session { self.sess } @@ -390,20 +98,24 @@ pub(crate) fn lint_store(&self) -> &LintStore { } fn current_specs(&self) -> &FxHashMap { - self.provider.current_specs() + &self.sets.list[self.cur].specs } fn current_specs_mut(&mut self) -> &mut FxHashMap { - self.provider.current_specs_mut() + &mut self.sets.list[self.cur].specs } - fn add_command_line(&mut self) { - for &(ref lint_name, level) in &self.sess.opts.lint_opts { - self.store.check_lint_name_cmdline(self.sess, &lint_name, level, self.registered_tools); + 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) = self.store.find_lints(&lint_name) else { + let Ok(ids) = store.find_lints(&lint_name) else { // errors handled in check_lint_name_cmdline above continue }; @@ -426,11 +138,9 @@ fn add_command_line(&mut self) { /// 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, (mut level, src): LevelAndSource) { - let (old_level, old_src) = self.provider.get_lint_level(id.lint, &self.sess); - if let Level::Expect(id) = &mut level && let LintExpectationId::Stable { .. } = id { - *id = id.normalize(); - } + 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`. @@ -448,7 +158,7 @@ fn insert_spec(&mut self, id: LintId, (mut level, src): LevelAndSource) { let id_name = id.lint.name_lower(); let fcw_warning = match old_src { LintLevelSource::Default => false, - LintLevelSource::Node { name, .. } => self.store.is_lint_group(name), + LintLevelSource::Node(symbol, _, _) => self.store.is_lint_group(symbol), LintLevelSource::CommandLine(symbol, _) => self.store.is_lint_group(symbol), }; debug!( @@ -468,8 +178,8 @@ fn insert_spec(&mut self, id: LintId, (mut level, src): LevelAndSource) { id.to_string() )); } - LintLevelSource::Node { span, reason, .. } => { - diag.span_label(span, "`forbid` level set here"); + 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()); } @@ -489,8 +199,11 @@ fn insert_spec(&mut self, id: LintId, (mut level, src): LevelAndSource) { LintLevelSource::Default => { OverruledAttributeSub::DefaultSource { id: id.to_string() } } - LintLevelSource::Node { span, reason, .. } => { - OverruledAttributeSub::NodeSource { span, reason } + LintLevelSource::Node(_, forbid_source_span, reason) => { + OverruledAttributeSub::NodeSource { + span: forbid_source_span, + reason, + } } LintLevelSource::CommandLine(_, _) => { OverruledAttributeSub::CommandLineSource @@ -543,7 +256,29 @@ fn insert_spec(&mut self, id: LintId, (mut level, src): LevelAndSource) { }; } - fn add(&mut self, attrs: &[ast::Attribute], is_crate_node: bool, source_hir_id: Option) { + /// 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, + ) -> BuilderPush { + let prev = self.cur; + self.cur = self.sets.list.push(LintSet { specs: FxHashMap::default(), parent: prev }); + let sess = self.sess; for (attr_index, attr) in attrs.iter().enumerate() { if attr.has_name(sym::automatically_derived) { @@ -558,17 +293,7 @@ fn add(&mut self, attrs: &[ast::Attribute], is_crate_node: bool, source_hir_id: 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 LintExpectationId::Unstable { attr_id, lint_index } = unstable_id - else { bug!("stable id Level::from_attr") }; - - let stable_id = LintExpectationId::Stable { - hir_id, - attr_index: attr_index.try_into().unwrap(), - lint_index, - // we pass the previous unstable attr_id such that we can trace the ast id when building a map - // to go from unstable to stable id. - attr_id: Some(attr_id), - }; + let stable_id = self.create_stable_id(unstable_id, hir_id, attr_index); Level::Expect(stable_id) } @@ -683,7 +408,7 @@ fn add(&mut self, attrs: &[ast::Attribute], is_crate_node: bool, source_hir_id: [lint] => *lint == LintId::of(UNFULFILLED_LINT_EXPECTATIONS), _ => false, }; - self.provider.push_expectation( + self.lint_expectations.push(( expect_id, LintExpectation::new( reason, @@ -691,19 +416,13 @@ fn add(&mut self, attrs: &[ast::Attribute], is_crate_node: bool, source_hir_id: is_unfulfilled_lint_expectations, tool_name, ), - ); + )); } - let src = LintLevelSource::Node { - name: meta_item - .path - .segments - .last() - .expect("empty lint name") - .ident - .name, - span: sp, + 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)); @@ -716,26 +435,31 @@ fn add(&mut self, attrs: &[ast::Attribute], is_crate_node: bool, source_hir_id: Ok(ids) => { let complete_name = &format!("{}::{}", tool_ident.unwrap().name, name); - let src = LintLevelSource::Node { - name: Symbol::intern(complete_name), - span: sp, + let src = LintLevelSource::Node( + Symbol::intern(complete_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.provider.push_expectation( + 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.provider.get_lint_level(lint, &sess); + let (lvl, src) = self.sets.get_lint_level( + lint, + self.cur, + Some(self.current_specs()), + &sess, + ); struct_lint_level( self.sess, lint, @@ -759,19 +483,19 @@ fn add(&mut self, attrs: &[ast::Attribute], is_crate_node: bool, source_hir_id: }, ); - let src = LintLevelSource::Node { - name: Symbol::intern(&new_lint_name), - span: sp, + 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.provider.push_expectation( + self.lint_expectations.push(( expect_id, LintExpectation::new(reason, sp, false, tool_name), - ); + )); } } Err((None, _)) => { @@ -797,7 +521,12 @@ fn add(&mut self, attrs: &[ast::Attribute], is_crate_node: bool, source_hir_id: CheckLintNameResult::Warning(msg, renamed) => { let lint = builtin::RENAMED_AND_REMOVED_LINTS; - let (renamed_lint_level, src) = self.provider.get_lint_level(lint, &sess); + let (renamed_lint_level, src) = self.sets.get_lint_level( + lint, + self.cur, + Some(self.current_specs()), + &sess, + ); struct_lint_level( self.sess, lint, @@ -820,7 +549,12 @@ fn add(&mut self, attrs: &[ast::Attribute], is_crate_node: bool, source_hir_id: } CheckLintNameResult::NoLint(suggestion) => { let lint = builtin::UNKNOWN_LINTS; - let (level, src) = self.provider.get_lint_level(lint, self.sess); + 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) @@ -849,21 +583,17 @@ fn add(&mut self, attrs: &[ast::Attribute], is_crate_node: bool, source_hir_id: if let CheckLintNameResult::Ok(ids) = self.store.check_lint_name(&new_name, None, self.registered_tools) { - let src = LintLevelSource::Node { - name: Symbol::intern(&new_name), - span: sp, - reason, - }; + 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.provider.push_expectation( + self.lint_expectations.push(( expect_id, LintExpectation::new(reason, sp, false, tool_name), - ); + )); } } else { panic!("renamed lint does not exist: {}", new_name); @@ -878,12 +608,13 @@ fn add(&mut self, attrs: &[ast::Attribute], is_crate_node: bool, source_hir_id: continue; } - let LintLevelSource::Node { name: lint_attr_name, span: lint_attr_span, .. } = *src else { + let LintLevelSource::Node(lint_attr_name, lint_attr_span, _) = *src else { continue }; let lint = builtin::UNUSED_ATTRIBUTES; - let (lint_level, lint_src) = self.provider.get_lint_level(lint, &self.sess); + 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, @@ -903,13 +634,32 @@ fn add(&mut self, attrs: &[ast::Attribute], is_crate_node: bool, source_hir_id: 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. - // FIXME only emit this once for each attribute, instead of repeating it 4 times for - // pre-expansion lints, post-expansion lints, `shallow_lint_levels_on` and `lint_expectations`. 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) { @@ -928,14 +678,19 @@ fn check_gated_lint(&self, lint_id: LintId, span: Span) -> bool { 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) -> LevelAndSource { - self.provider.get_lint_level(lint, self.sess) + 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(crate) fn struct_lint( + pub fn struct_lint( &self, lint: &'static Lint, span: Option, @@ -944,8 +699,141 @@ pub(crate) fn struct_lint( 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, + } + } } -pub(crate) fn provide(providers: &mut Providers) { - *providers = Providers { shallow_lint_levels_on, lint_expectations, ..*providers }; +struct LintLevelMapBuilder<'tcx> { + levels: LintLevelsBuilder<'tcx>, + tcx: TyCtxt<'tcx>, +} + +impl LintLevelMapBuilder<'_> { + fn with_lint_attrs(&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_expr_field(&mut self, field: &'tcx hir::ExprField<'tcx>) { + self.with_lint_attrs(field.hir_id, |builder| { + intravisit::walk_expr_field(builder, field); + }) + } + + 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>) { + self.with_lint_attrs(v.id, |builder| { + intravisit::walk_variant(builder, v); + }) + } + + 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); + }); + } + + fn visit_pat_field(&mut self, field: &'tcx hir::PatField<'tcx>) { + self.with_lint_attrs(field.hir_id, |builder| { + intravisit::walk_pat_field(builder, field); + }) + } + + fn visit_generic_param(&mut self, p: &'tcx hir::GenericParam<'tcx>) { + self.with_lint_attrs(p.hir_id, |builder| { + intravisit::walk_generic_param(builder, p); + }); + } +} + +pub fn provide(providers: &mut Providers) { + providers.lint_levels = lint_levels; } diff --git a/compiler/rustc_lint/src/lib.rs b/compiler/rustc_lint/src/lib.rs index c760e435699..752a751f6bc 100644 --- a/compiler/rustc_lint/src/lib.rs +++ b/compiler/rustc_lint/src/lib.rs @@ -35,7 +35,6 @@ #![feature(iter_order_by)] #![feature(let_chains)] #![cfg_attr(bootstrap, feature(let_else))] -#![feature(min_specialization)] #![feature(never_type)] #![recursion_limit = "256"] diff --git a/compiler/rustc_lint_defs/src/lib.rs b/compiler/rustc_lint_defs/src/lib.rs index cbe7afc8e55..11b2d057a07 100644 --- a/compiler/rustc_lint_defs/src/lib.rs +++ b/compiler/rustc_lint_defs/src/lib.rs @@ -92,7 +92,7 @@ pub enum LintExpectationId { /// stable and can be cached. The additional index ensures that nodes with /// several expectations can correctly match diagnostics to the individual /// expectation. - Stable { hir_id: HirId, attr_index: u16, lint_index: Option, attr_id: Option }, + Stable { hir_id: HirId, attr_index: u16, lint_index: Option }, } impl LintExpectationId { @@ -116,31 +116,13 @@ pub fn set_lint_index(&mut self, new_lint_index: Option) { *lint_index = new_lint_index } - - /// Prepares the id for hashing. Removes references to the ast. - /// Should only be called when the id is stable. - pub fn normalize(self) -> Self { - match self { - Self::Stable { hir_id, attr_index, lint_index, .. } => { - Self::Stable { hir_id, attr_index, lint_index, attr_id: None } - } - Self::Unstable { .. } => { - unreachable!("`normalize` called when `ExpectationId` is unstable") - } - } - } } impl HashStable for LintExpectationId { #[inline] fn hash_stable(&self, hcx: &mut HCX, hasher: &mut StableHasher) { match self { - LintExpectationId::Stable { - hir_id, - attr_index, - lint_index: Some(lint_index), - attr_id: _, - } => { + LintExpectationId::Stable { hir_id, attr_index, lint_index: Some(lint_index) } => { hir_id.hash_stable(hcx, hasher); attr_index.hash_stable(hcx, hasher); lint_index.hash_stable(hcx, hasher); @@ -160,12 +142,9 @@ impl ToStableHashKey for LintExpectation #[inline] fn to_stable_hash_key(&self, _: &HCX) -> Self::KeyType { match self { - LintExpectationId::Stable { - hir_id, - attr_index, - lint_index: Some(lint_index), - attr_id: _, - } => (*hir_id, *attr_index, *lint_index), + LintExpectationId::Stable { hir_id, attr_index, lint_index: Some(lint_index) } => { + (*hir_id, *attr_index, *lint_index) + } _ => { unreachable!("HashStable should only be called for a filled `LintExpectationId`") } diff --git a/compiler/rustc_middle/src/dep_graph/dep_node.rs b/compiler/rustc_middle/src/dep_graph/dep_node.rs index eded3b3eedc..1fa0c6babab 100644 --- a/compiler/rustc_middle/src/dep_graph/dep_node.rs +++ b/compiler/rustc_middle/src/dep_graph/dep_node.rs @@ -62,7 +62,7 @@ use rustc_data_structures::fingerprint::Fingerprint; use rustc_hir::def_id::{CrateNum, DefId, LocalDefId}; use rustc_hir::definitions::DefPathHash; -use rustc_hir::{HirId, ItemLocalId}; +use rustc_hir::HirId; use rustc_query_system::dep_graph::FingerprintStyle; use rustc_span::symbol::Symbol; use std::hash::Hash; @@ -280,7 +280,7 @@ fn from_label_string( let kind = dep_kind_from_label_string(label)?; match kind.fingerprint_style(tcx) { - FingerprintStyle::Opaque | FingerprintStyle::HirId => Err(()), + FingerprintStyle::Opaque => Err(()), FingerprintStyle::Unit => Ok(DepNode::new_no_params(tcx, kind)), FingerprintStyle::DefPathHash => { Ok(DepNode::from_def_path_hash(tcx, def_path_hash, kind)) @@ -408,7 +408,7 @@ fn to_debug_str(&self, tcx: TyCtxt<'tcx>) -> String { impl<'tcx> DepNodeParams> for HirId { #[inline(always)] fn fingerprint_style() -> FingerprintStyle { - FingerprintStyle::HirId + FingerprintStyle::Opaque } // We actually would not need to specialize the implementation of this @@ -417,36 +417,10 @@ fn fingerprint_style() -> FingerprintStyle { #[inline(always)] fn to_fingerprint(&self, tcx: TyCtxt<'tcx>) -> Fingerprint { let HirId { owner, local_id } = *self; + let def_path_hash = tcx.def_path_hash(owner.to_def_id()); - Fingerprint::new( - // `owner` is local, so is completely defined by the local hash - def_path_hash.local_hash(), - local_id.as_u32().into(), - ) - } + let local_id = Fingerprint::from_smaller_hash(local_id.as_u32().into()); - #[inline(always)] - fn to_debug_str(&self, tcx: TyCtxt<'tcx>) -> String { - let HirId { owner, local_id } = *self; - format!("{}.{}", tcx.def_path_str(owner.to_def_id()), local_id.as_u32()) - } - - #[inline(always)] - fn recover(tcx: TyCtxt<'tcx>, dep_node: &DepNode) -> Option { - if dep_node.kind.fingerprint_style(tcx) == FingerprintStyle::HirId { - let (local_hash, local_id) = Fingerprint::from(dep_node.hash).as_value(); - let def_path_hash = DefPathHash::new(tcx.sess.local_stable_crate_id(), local_hash); - let owner = tcx - .def_path_hash_to_def_id(def_path_hash, &mut || { - panic!("Failed to extract HirId: {:?} {}", dep_node.kind, dep_node.hash) - }) - .expect_local(); - let local_id = local_id - .try_into() - .unwrap_or_else(|_| panic!("local id should be u32, found {:?}", local_id)); - Some(HirId { owner, local_id: ItemLocalId::from_u32(local_id) }) - } else { - None - } + def_path_hash.0.combine(local_id) } } diff --git a/compiler/rustc_middle/src/lint.rs b/compiler/rustc_middle/src/lint.rs index 4cb5ef79177..2f45222de47 100644 --- a/compiler/rustc_middle/src/lint.rs +++ b/compiler/rustc_middle/src/lint.rs @@ -1,19 +1,20 @@ use std::cmp; use rustc_data_structures::fx::FxHashMap; +use rustc_data_structures::stable_hasher::{HashStable, StableHasher}; use rustc_errors::{Diagnostic, DiagnosticId, LintDiagnosticBuilder, MultiSpan}; use rustc_hir::HirId; +use rustc_index::vec::IndexVec; +use rustc_query_system::ich::StableHashingContext; use rustc_session::lint::{ builtin::{self, FORBIDDEN_LINT_GROUPS}, - FutureIncompatibilityReason, Level, Lint, LintId, + FutureIncompatibilityReason, Level, Lint, LintExpectationId, LintId, }; use rustc_session::Session; use rustc_span::hygiene::MacroKind; use rustc_span::source_map::{DesugaringKind, ExpnKind}; use rustc_span::{symbol, Span, Symbol, DUMMY_SP}; -use crate::ty::TyCtxt; - /// How a lint level was set. #[derive(Clone, Copy, PartialEq, Eq, HashStable, Debug)] pub enum LintLevelSource { @@ -22,12 +23,7 @@ pub enum LintLevelSource { Default, /// Lint level was set by an attribute. - Node { - name: Symbol, - span: Span, - /// RFC 2383 reason - reason: Option, - }, + Node(Symbol, Span, Option /* RFC 2383 reason */), /// Lint level was set by a command-line flag. /// The provided `Level` is the level specified on the command line. @@ -39,7 +35,7 @@ impl LintLevelSource { pub fn name(&self) -> Symbol { match *self { LintLevelSource::Default => symbol::kw::Default, - LintLevelSource::Node { name, .. } => name, + LintLevelSource::Node(name, _, _) => name, LintLevelSource::CommandLine(name, _) => name, } } @@ -47,7 +43,7 @@ pub fn name(&self) -> Symbol { pub fn span(&self) -> Span { match *self { LintLevelSource::Default => DUMMY_SP, - LintLevelSource::Node { span, .. } => span, + LintLevelSource::Node(_, span, _) => span, LintLevelSource::CommandLine(_, _) => DUMMY_SP, } } @@ -56,115 +52,145 @@ pub fn span(&self) -> Span { /// A tuple of a lint level and its source. pub type LevelAndSource = (Level, LintLevelSource); -/// Return type for the `shallow_lint_levels_on` query. -/// -/// This map represents the set of allowed lints and allowance levels given -/// by the attributes for *a single HirId*. -#[derive(Default, Debug, HashStable)] -pub struct ShallowLintLevelMap { - pub specs: FxHashMap, +#[derive(Debug, HashStable)] +pub struct LintLevelSets { + pub list: IndexVec, + pub lint_cap: Level, } -/// From an initial level and source, verify the effect of special annotations: -/// `warnings` lint level and lint caps. -/// -/// The return of this function is suitable for diagnostics. -pub fn reveal_actual_level( - level: Option, - src: &mut LintLevelSource, - sess: &Session, - lint: LintId, - probe_for_lint_level: impl FnOnce(LintId) -> (Option, LintLevelSource), -) -> Level { - // If `level` is none then we actually assume the default level for this lint. - let mut level = level.unwrap_or_else(|| lint.lint.default_level(sess.edition())); +rustc_index::newtype_index! { + #[derive(HashStable)] + pub struct LintStackIndex { + const COMMAND_LINE = 0, + } +} - // If we're about to issue a warning, check at the last minute for any - // directives against the warnings "lint". If, for example, there's an - // `allow(warnings)` in scope then we want to respect that instead. - // - // We exempt `FORBIDDEN_LINT_GROUPS` from this because it specifically - // triggers in cases (like #80988) where you have `forbid(warnings)`, - // and so if we turned that into an error, it'd defeat the purpose of the - // future compatibility warning. - if level == Level::Warn && lint != LintId::of(FORBIDDEN_LINT_GROUPS) { - let (warnings_level, warnings_src) = probe_for_lint_level(LintId::of(builtin::WARNINGS)); - if let Some(configured_warning_level) = warnings_level { - if configured_warning_level != Level::Warn { - level = configured_warning_level; - *src = warnings_src; +#[derive(Debug, HashStable)] +pub struct LintSet { + // -A,-W,-D flags, a `Symbol` for the flag itself and `Level` for which + // flag. + pub specs: FxHashMap, + + pub parent: LintStackIndex, +} + +impl LintLevelSets { + pub fn new() -> Self { + LintLevelSets { list: IndexVec::new(), lint_cap: Level::Forbid } + } + + pub fn get_lint_level( + &self, + lint: &'static Lint, + idx: LintStackIndex, + aux: Option<&FxHashMap>, + sess: &Session, + ) -> LevelAndSource { + let (level, mut src) = self.get_lint_id_level(LintId::of(lint), idx, aux); + + // If `level` is none then we actually assume the default level for this + // lint. + let mut level = level.unwrap_or_else(|| lint.default_level(sess.edition())); + + // If we're about to issue a warning, check at the last minute for any + // directives against the warnings "lint". If, for example, there's an + // `allow(warnings)` in scope then we want to respect that instead. + // + // We exempt `FORBIDDEN_LINT_GROUPS` from this because it specifically + // triggers in cases (like #80988) where you have `forbid(warnings)`, + // and so if we turned that into an error, it'd defeat the purpose of the + // future compatibility warning. + if level == Level::Warn && LintId::of(lint) != LintId::of(FORBIDDEN_LINT_GROUPS) { + let (warnings_level, warnings_src) = + self.get_lint_id_level(LintId::of(builtin::WARNINGS), idx, aux); + if let Some(configured_warning_level) = warnings_level { + if configured_warning_level != Level::Warn { + level = configured_warning_level; + src = warnings_src; + } } } - } - // Ensure that we never exceed the `--cap-lints` argument unless the source is a --force-warn - level = if let LintLevelSource::CommandLine(_, Level::ForceWarn(_)) = src { - level - } else { - cmp::min(level, sess.opts.lint_cap.unwrap_or(Level::Forbid)) - }; + // Ensure that we never exceed the `--cap-lints` argument + // unless the source is a --force-warn + level = if let LintLevelSource::CommandLine(_, Level::ForceWarn(_)) = src { + level + } else { + cmp::min(level, self.lint_cap) + }; - if let Some(driver_level) = sess.driver_lint_caps.get(&lint) { - // Ensure that we never exceed driver level. - level = cmp::min(*driver_level, level); - } - - level -} - -impl ShallowLintLevelMap { - /// Perform a deep probe in the HIR tree looking for the actual level for the lint. - /// This lint level is not usable for diagnostics, it needs to be corrected by - /// `reveal_actual_level` beforehand. - fn probe_for_lint_level( - &self, - tcx: TyCtxt<'_>, - id: LintId, - start: HirId, - ) -> (Option, LintLevelSource) { - if let Some(&(level, src)) = self.specs.get(&id) { - return (Some(level), src); + if let Some(driver_level) = sess.driver_lint_caps.get(&LintId::of(lint)) { + // Ensure that we never exceed driver level. + level = cmp::min(*driver_level, level); } - for (parent, _) in tcx.hir().parent_iter(start) { - let specs = tcx.shallow_lint_levels_on(parent); - if let Some(&(level, src)) = specs.specs.get(&id) { + (level, src) + } + + pub fn get_lint_id_level( + &self, + id: LintId, + mut idx: LintStackIndex, + aux: Option<&FxHashMap>, + ) -> (Option, LintLevelSource) { + if let Some(specs) = aux { + if let Some(&(level, src)) = specs.get(&id) { return (Some(level), src); } } - (None, LintLevelSource::Default) - } - - /// Fetch and return the user-visible lint level for the given lint at the given HirId. - pub fn lint_level_id_at_node( - &self, - tcx: TyCtxt<'_>, - lint: LintId, - id: HirId, - ) -> (Level, LintLevelSource) { - let (level, mut src) = self.probe_for_lint_level(tcx, lint, id); - let level = reveal_actual_level(level, &mut src, tcx.sess, lint, |lint| { - self.probe_for_lint_level(tcx, lint, id) - }); - debug!(?id, ?level, ?src); - (level, src) + loop { + let LintSet { ref specs, parent } = self.list[idx]; + if let Some(&(level, src)) = specs.get(&id) { + return (Some(level), src); + } + if idx == COMMAND_LINE { + return (None, LintLevelSource::Default); + } + idx = parent; + } } } -impl TyCtxt<'_> { - /// Fetch and return the user-visible lint level for the given lint at the given HirId. - pub fn lint_level_at_node(self, lint: &'static Lint, id: HirId) -> (Level, LintLevelSource) { - self.shallow_lint_levels_on(id).lint_level_id_at_node(self, LintId::of(lint), id) - } +#[derive(Debug)] +pub struct LintLevelMap { + /// This is a collection of lint expectations as described in RFC 2383, that + /// can be fulfilled during this compilation session. This means that at least + /// one expected lint is currently registered in the lint store. + /// + /// The [`LintExpectationId`] is stored as a part of the [`Expect`](Level::Expect) + /// lint level. + pub lint_expectations: Vec<(LintExpectationId, LintExpectation)>, + pub sets: LintLevelSets, + pub id_to_set: FxHashMap, +} - /// Walks upwards from `id` to find a node which might change lint levels with attributes. - /// It stops at `bound` and just returns it if reached. - pub fn maybe_lint_level_root_bounded(self, mut id: HirId, bound: HirId) -> HirId { - let hir = self.hir(); - while id != bound && self.shallow_lint_levels_on(id).specs.is_empty() { - id = hir.get_parent_node(id) - } - id +impl LintLevelMap { + /// If the `id` was previously registered with `register_id` when building + /// this `LintLevelMap` this returns the corresponding lint level and source + /// of the lint level for the lint provided. + /// + /// If the `id` was not previously registered, returns `None`. If `None` is + /// returned then the parent of `id` should be acquired and this function + /// should be called again. + pub fn level_and_source( + &self, + lint: &'static Lint, + id: HirId, + session: &Session, + ) -> Option { + self.id_to_set.get(&id).map(|idx| self.sets.get_lint_level(lint, *idx, None, session)) + } +} + +impl<'a> HashStable> for LintLevelMap { + #[inline] + fn hash_stable(&self, hcx: &mut StableHashingContext<'a>, hasher: &mut StableHasher) { + let LintLevelMap { ref sets, ref id_to_set, ref lint_expectations } = *self; + + id_to_set.hash_stable(hcx, hasher); + lint_expectations.hash_stable(hcx, hasher); + + hcx.while_hashing_spans(true, |hcx| sets.hash_stable(hcx, hasher)) } } @@ -235,11 +261,11 @@ pub fn explain_lint_level_source( )); } } - LintLevelSource::Node { name: lint_attr_name, span, reason, .. } => { + LintLevelSource::Node(lint_attr_name, src, reason) => { if let Some(rationale) = reason { err.note(rationale.as_str()); } - err.span_note_once(span, "the lint level is defined here"); + err.span_note_once(src, "the lint level is defined here"); if lint_attr_name.as_str() != name { let level_str = level.as_str(); err.note_once(&format!( diff --git a/compiler/rustc_middle/src/query/mod.rs b/compiler/rustc_middle/src/query/mod.rs index 1afea4864b8..7ea8c9ed3d3 100644 --- a/compiler/rustc_middle/src/query/mod.rs +++ b/compiler/rustc_middle/src/query/mod.rs @@ -274,14 +274,10 @@ separate_provide_extern } - query shallow_lint_levels_on(key: HirId) -> rustc_middle::lint::ShallowLintLevelMap { + query lint_levels(_: ()) -> LintLevelMap { arena_cache - desc { |tcx| "looking up lint levels for `{}`", key } - } - - query lint_expectations(_: ()) -> Vec<(LintExpectationId, LintExpectation)> { - arena_cache - desc { "computing `#[expect]`ed lints in this crate" } + eval_always + desc { "computing the lint levels for items in this crate" } } query parent_module_from_def_id(key: LocalDefId) -> LocalDefId { diff --git a/compiler/rustc_middle/src/ty/context.rs b/compiler/rustc_middle/src/ty/context.rs index 2b5b4017a5a..8c44f4a98df 100644 --- a/compiler/rustc_middle/src/ty/context.rs +++ b/compiler/rustc_middle/src/ty/context.rs @@ -4,7 +4,7 @@ use crate::dep_graph::{DepGraph, DepKind, DepKindStruct}; use crate::hir::place::Place as HirPlace; use crate::infer::canonical::{Canonical, CanonicalVarInfo, CanonicalVarInfos}; -use crate::lint::struct_lint_level; +use crate::lint::{struct_lint_level, LintLevelSource}; use crate::middle::codegen_fn_attrs::CodegenFnAttrs; use crate::middle::resolve_lifetime; use crate::middle::stability; @@ -54,7 +54,7 @@ use rustc_session::config::{CrateType, OutputFilenames}; use rustc_session::cstore::CrateStoreDyn; use rustc_session::errors::TargetDataLayoutErrorsWrapper; -use rustc_session::lint::Lint; +use rustc_session::lint::{Level, Lint}; use rustc_session::Limit; use rustc_session::Session; use rustc_span::def_id::{DefPathHash, StableCrateId}; @@ -2813,6 +2813,44 @@ pub fn mk_bound_variable_kinds< iter.intern_with(|xs| self.intern_bound_variable_kinds(xs)) } + /// Walks upwards from `id` to find a node which might change lint levels with attributes. + /// It stops at `bound` and just returns it if reached. + pub fn maybe_lint_level_root_bounded(self, mut id: HirId, bound: HirId) -> HirId { + let hir = self.hir(); + loop { + if id == bound { + return bound; + } + + if hir.attrs(id).iter().any(|attr| Level::from_attr(attr).is_some()) { + return id; + } + let next = hir.get_parent_node(id); + if next == id { + bug!("lint traversal reached the root of the crate"); + } + id = next; + } + } + + pub fn lint_level_at_node( + self, + lint: &'static Lint, + mut id: hir::HirId, + ) -> (Level, LintLevelSource) { + let sets = self.lint_levels(()); + loop { + if let Some(pair) = sets.level_and_source(lint, id, self.sess) { + return pair; + } + let next = self.hir().get_parent_node(id); + if next == id { + bug!("lint traversal reached the root of the crate"); + } + id = next; + } + } + /// Emit a lint at `span` from a lint struct (some type that implements `DecorateLint`, /// typically generated by `#[derive(LintDiagnostic)]`). pub fn emit_spanned_lint( diff --git a/compiler/rustc_middle/src/ty/query.rs b/compiler/rustc_middle/src/ty/query.rs index be208a9fc70..00da260b1dc 100644 --- a/compiler/rustc_middle/src/ty/query.rs +++ b/compiler/rustc_middle/src/ty/query.rs @@ -1,6 +1,6 @@ use crate::dep_graph; use crate::infer::canonical::{self, Canonical}; -use crate::lint::LintExpectation; +use crate::lint::LintLevelMap; use crate::metadata::ModChild; use crate::middle::codegen_fn_attrs::CodegenFnAttrs; use crate::middle::exported_symbols::{ExportedSymbol, SymbolExportInfo}; @@ -44,14 +44,12 @@ use rustc_hir as hir; use rustc_hir::def::DefKind; use rustc_hir::def_id::{CrateNum, DefId, DefIdMap, DefIdSet, LocalDefId}; -use rustc_hir::hir_id::HirId; use rustc_hir::lang_items::{LangItem, LanguageItems}; use rustc_hir::{Crate, ItemLocalId, TraitCandidate}; use rustc_index::{bit_set::FiniteBitSet, vec::IndexVec}; use rustc_session::config::{EntryFnType, OptLevel, OutputFilenames, SymbolManglingVersion}; use rustc_session::cstore::{CrateDepKind, CrateSource}; use rustc_session::cstore::{ExternCrate, ForeignModule, LinkagePreference, NativeLib}; -use rustc_session::lint::LintExpectationId; use rustc_session::utils::NativeLibKind; use rustc_session::Limits; use rustc_span::symbol::Symbol; diff --git a/compiler/rustc_query_impl/src/keys.rs b/compiler/rustc_query_impl/src/keys.rs index 31de83ee141..49175e97f41 100644 --- a/compiler/rustc_query_impl/src/keys.rs +++ b/compiler/rustc_query_impl/src/keys.rs @@ -1,7 +1,6 @@ //! Defines the set of legal keys that can be used in queries. use rustc_hir::def_id::{CrateNum, DefId, LocalDefId, LOCAL_CRATE}; -use rustc_hir::hir_id::HirId; use rustc_middle::infer::canonical::Canonical; use rustc_middle::mir; use rustc_middle::traits; @@ -544,19 +543,3 @@ fn default_span(&self, _: TyCtxt<'_>) -> Span { DUMMY_SP } } - -impl Key for HirId { - #[inline(always)] - fn query_crate_is_local(&self) -> bool { - true - } - - fn default_span(&self, tcx: TyCtxt<'_>) -> Span { - tcx.hir().span(*self) - } - - #[inline(always)] - fn key_as_def_id(&self) -> Option { - None - } -} diff --git a/compiler/rustc_query_system/src/dep_graph/mod.rs b/compiler/rustc_query_system/src/dep_graph/mod.rs index 6f3bd776216..342d95ca490 100644 --- a/compiler/rustc_query_system/src/dep_graph/mod.rs +++ b/compiler/rustc_query_system/src/dep_graph/mod.rs @@ -67,8 +67,6 @@ fn dep_context(&self) -> &Self::DepContext { pub enum FingerprintStyle { /// The fingerprint is actually a DefPathHash. DefPathHash, - /// The fingerprint is actually a HirId. - HirId, /// Query key was `()` or equivalent, so fingerprint is just zero. Unit, /// Some opaque hash. @@ -79,9 +77,7 @@ impl FingerprintStyle { #[inline] pub fn reconstructible(self) -> bool { match self { - FingerprintStyle::DefPathHash | FingerprintStyle::Unit | FingerprintStyle::HirId => { - true - } + FingerprintStyle::DefPathHash | FingerprintStyle::Unit => true, FingerprintStyle::Opaque => false, } } diff --git a/src/test/ui/feature-gates/feature-gate-non_exhaustive_omitted_patterns_lint.rs b/src/test/ui/feature-gates/feature-gate-non_exhaustive_omitted_patterns_lint.rs index 23457b8e062..9b646060adf 100644 --- a/src/test/ui/feature-gates/feature-gate-non_exhaustive_omitted_patterns_lint.rs +++ b/src/test/ui/feature-gates/feature-gate-non_exhaustive_omitted_patterns_lint.rs @@ -3,11 +3,9 @@ #![deny(non_exhaustive_omitted_patterns)] //~^ WARNING unknown lint: `non_exhaustive_omitted_patterns` //~| WARNING unknown lint: `non_exhaustive_omitted_patterns` -//~| WARNING unknown lint: `non_exhaustive_omitted_patterns` #![allow(non_exhaustive_omitted_patterns)] //~^ WARNING unknown lint: `non_exhaustive_omitted_patterns` //~| WARNING unknown lint: `non_exhaustive_omitted_patterns` -//~| WARNING unknown lint: `non_exhaustive_omitted_patterns` fn main() { enum Foo { @@ -19,8 +17,6 @@ enum Foo { //~| WARNING unknown lint: `non_exhaustive_omitted_patterns` //~| WARNING unknown lint: `non_exhaustive_omitted_patterns` //~| WARNING unknown lint: `non_exhaustive_omitted_patterns` - //~| WARNING unknown lint: `non_exhaustive_omitted_patterns` - //~| WARNING unknown lint: `non_exhaustive_omitted_patterns` match Foo::A { Foo::A => {} Foo::B => {} @@ -35,5 +31,4 @@ enum Foo { } //~^^^ WARNING unknown lint: `non_exhaustive_omitted_patterns` //~| WARNING unknown lint: `non_exhaustive_omitted_patterns` - //~| WARNING unknown lint: `non_exhaustive_omitted_patterns` } diff --git a/src/test/ui/feature-gates/feature-gate-non_exhaustive_omitted_patterns_lint.stderr b/src/test/ui/feature-gates/feature-gate-non_exhaustive_omitted_patterns_lint.stderr index 29023858e4f..3de08e215da 100644 --- a/src/test/ui/feature-gates/feature-gate-non_exhaustive_omitted_patterns_lint.stderr +++ b/src/test/ui/feature-gates/feature-gate-non_exhaustive_omitted_patterns_lint.stderr @@ -10,7 +10,7 @@ LL | #![deny(non_exhaustive_omitted_patterns)] = help: add `#![feature(non_exhaustive_omitted_patterns_lint)]` to the crate attributes to enable warning: unknown lint: `non_exhaustive_omitted_patterns` - --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:7:1 + --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:6:1 | LL | #![allow(non_exhaustive_omitted_patterns)] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ @@ -20,7 +20,7 @@ LL | #![allow(non_exhaustive_omitted_patterns)] = help: add `#![feature(non_exhaustive_omitted_patterns_lint)]` to the crate attributes to enable warning: unknown lint: `non_exhaustive_omitted_patterns` - --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:17:5 + --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:15:5 | LL | #[allow(non_exhaustive_omitted_patterns)] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ @@ -30,7 +30,7 @@ LL | #[allow(non_exhaustive_omitted_patterns)] = help: add `#![feature(non_exhaustive_omitted_patterns_lint)]` to the crate attributes to enable warning: unknown lint: `non_exhaustive_omitted_patterns` - --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:17:5 + --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:15:5 | LL | #[allow(non_exhaustive_omitted_patterns)] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ @@ -40,7 +40,7 @@ LL | #[allow(non_exhaustive_omitted_patterns)] = help: add `#![feature(non_exhaustive_omitted_patterns_lint)]` to the crate attributes to enable warning: unknown lint: `non_exhaustive_omitted_patterns` - --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:33:9 + --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:29:9 | LL | #[warn(non_exhaustive_omitted_patterns)] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ @@ -60,7 +60,7 @@ LL | #![deny(non_exhaustive_omitted_patterns)] = help: add `#![feature(non_exhaustive_omitted_patterns_lint)]` to the crate attributes to enable warning: unknown lint: `non_exhaustive_omitted_patterns` - --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:7:1 + --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:6:1 | LL | #![allow(non_exhaustive_omitted_patterns)] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ @@ -70,7 +70,7 @@ LL | #![allow(non_exhaustive_omitted_patterns)] = help: add `#![feature(non_exhaustive_omitted_patterns_lint)]` to the crate attributes to enable warning: unknown lint: `non_exhaustive_omitted_patterns` - --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:17:5 + --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:15:5 | LL | #[allow(non_exhaustive_omitted_patterns)] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ @@ -80,7 +80,7 @@ LL | #[allow(non_exhaustive_omitted_patterns)] = help: add `#![feature(non_exhaustive_omitted_patterns_lint)]` to the crate attributes to enable warning: unknown lint: `non_exhaustive_omitted_patterns` - --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:17:5 + --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:15:5 | LL | #[allow(non_exhaustive_omitted_patterns)] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ @@ -90,7 +90,7 @@ LL | #[allow(non_exhaustive_omitted_patterns)] = help: add `#![feature(non_exhaustive_omitted_patterns_lint)]` to the crate attributes to enable warning: unknown lint: `non_exhaustive_omitted_patterns` - --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:33:9 + --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:29:9 | LL | #[warn(non_exhaustive_omitted_patterns)] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ @@ -100,13 +100,13 @@ LL | #[warn(non_exhaustive_omitted_patterns)] = help: add `#![feature(non_exhaustive_omitted_patterns_lint)]` to the crate attributes to enable error[E0004]: non-exhaustive patterns: `Foo::C` not covered - --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:24:11 + --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:20:11 | LL | match Foo::A { | ^^^^^^ pattern `Foo::C` not covered | note: `Foo` defined here - --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:14:15 + --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:12:15 | LL | enum Foo { | --- @@ -119,56 +119,6 @@ LL ~ Foo::B => {} LL + Foo::C => todo!() | -warning: unknown lint: `non_exhaustive_omitted_patterns` - --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:3:1 - | -LL | #![deny(non_exhaustive_omitted_patterns)] - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - | - = note: the `non_exhaustive_omitted_patterns` lint is unstable - = note: see issue #89554 for more information - = help: add `#![feature(non_exhaustive_omitted_patterns_lint)]` to the crate attributes to enable - -warning: unknown lint: `non_exhaustive_omitted_patterns` - --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:7:1 - | -LL | #![allow(non_exhaustive_omitted_patterns)] - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - | - = note: the `non_exhaustive_omitted_patterns` lint is unstable - = note: see issue #89554 for more information - = help: add `#![feature(non_exhaustive_omitted_patterns_lint)]` to the crate attributes to enable - -warning: unknown lint: `non_exhaustive_omitted_patterns` - --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:17:5 - | -LL | #[allow(non_exhaustive_omitted_patterns)] - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - | - = note: the `non_exhaustive_omitted_patterns` lint is unstable - = note: see issue #89554 for more information - = help: add `#![feature(non_exhaustive_omitted_patterns_lint)]` to the crate attributes to enable - -warning: unknown lint: `non_exhaustive_omitted_patterns` - --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:17:5 - | -LL | #[allow(non_exhaustive_omitted_patterns)] - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - | - = note: the `non_exhaustive_omitted_patterns` lint is unstable - = note: see issue #89554 for more information - = help: add `#![feature(non_exhaustive_omitted_patterns_lint)]` to the crate attributes to enable - -warning: unknown lint: `non_exhaustive_omitted_patterns` - --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:33:9 - | -LL | #[warn(non_exhaustive_omitted_patterns)] - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - | - = note: the `non_exhaustive_omitted_patterns` lint is unstable - = note: see issue #89554 for more information - = help: add `#![feature(non_exhaustive_omitted_patterns_lint)]` to the crate attributes to enable - -error: aborting due to previous error; 15 warnings emitted +error: aborting due to previous error; 10 warnings emitted For more information about this error, try `rustc --explain E0004`. diff --git a/src/test/ui/lint/rfc-2383-lint-reason/force_warn_expected_lints_fulfilled.stderr b/src/test/ui/lint/rfc-2383-lint-reason/force_warn_expected_lints_fulfilled.stderr index 5942fa8aeb4..06befcbb511 100644 --- a/src/test/ui/lint/rfc-2383-lint-reason/force_warn_expected_lints_fulfilled.stderr +++ b/src/test/ui/lint/rfc-2383-lint-reason/force_warn_expected_lints_fulfilled.stderr @@ -1,3 +1,11 @@ +warning: denote infinite loops with `loop { ... }` + --> $DIR/force_warn_expected_lints_fulfilled.rs:10:5 + | +LL | while true { + | ^^^^^^^^^^ help: use `loop` + | + = note: requested on the command line with `--force-warn while-true` + warning: unused variable: `x` --> $DIR/force_warn_expected_lints_fulfilled.rs:20:9 | @@ -28,13 +36,5 @@ LL | let mut what_does_the_fox_say = "*ding* *deng* *dung*"; | = note: requested on the command line with `--force-warn unused-mut` -warning: denote infinite loops with `loop { ... }` - --> $DIR/force_warn_expected_lints_fulfilled.rs:10:5 - | -LL | while true { - | ^^^^^^^^^^ help: use `loop` - | - = note: requested on the command line with `--force-warn while-true` - warning: 5 warnings emitted