diff options
Diffstat (limited to '')
| -rw-r--r-- | compiler/rustc_passes/src/check_attr.rs | 82 | ||||
| -rw-r--r-- | compiler/rustc_passes/src/dead.rs | 22 | ||||
| -rw-r--r-- | compiler/rustc_passes/src/entry.rs | 56 | ||||
| -rw-r--r-- | compiler/rustc_passes/src/errors.rs | 201 | ||||
| -rw-r--r-- | compiler/rustc_passes/src/hir_id_validator.rs | 2 | ||||
| -rw-r--r-- | compiler/rustc_passes/src/hir_stats.rs | 540 | ||||
| -rw-r--r-- | compiler/rustc_passes/src/lib.rs | 2 | ||||
| -rw-r--r-- | compiler/rustc_passes/src/lib_features.rs | 25 | ||||
| -rw-r--r-- | compiler/rustc_passes/src/liveness.rs | 220 | ||||
| -rw-r--r-- | compiler/rustc_passes/src/naked_functions.rs | 96 | ||||
| -rw-r--r-- | compiler/rustc_passes/src/stability.rs | 176 |
11 files changed, 1017 insertions, 405 deletions
diff --git a/compiler/rustc_passes/src/check_attr.rs b/compiler/rustc_passes/src/check_attr.rs index a2ac329f2..b3f15ba7c 100644 --- a/compiler/rustc_passes/src/check_attr.rs +++ b/compiler/rustc_passes/src/check_attr.rs @@ -16,6 +16,7 @@ use rustc_hir::intravisit::{self, Visitor}; use rustc_hir::{self, FnSig, ForeignItem, HirId, Item, ItemKind, TraitItem, CRATE_HIR_ID}; use rustc_hir::{MethodKind, Target}; use rustc_middle::hir::nested_filter; +use rustc_middle::middle::resolve_lifetime::ObjectLifetimeDefault; use rustc_middle::ty::query::Providers; use rustc_middle::ty::TyCtxt; use rustc_session::lint::builtin::{ @@ -130,6 +131,7 @@ impl CheckAttrVisitor<'_> { | sym::rustc_if_this_changed | sym::rustc_then_this_would_need => self.check_rustc_dirty_clean(&attr), sym::cmse_nonsecure_entry => self.check_cmse_nonsecure_entry(attr, span, target), + sym::collapse_debuginfo => self.check_collapse_debuginfo(attr, span, target), sym::const_trait => self.check_const_trait(attr, span, target), sym::must_not_suspend => self.check_must_not_suspend(&attr, span, target), sym::must_use => self.check_must_use(hir_id, &attr, span, target), @@ -146,6 +148,7 @@ impl CheckAttrVisitor<'_> { | sym::stable | sym::rustc_allowed_through_unstable_modules | sym::rustc_promotable => self.check_stability_promotable(&attr, span, target), + sym::link_ordinal => self.check_link_ordinal(&attr, span, target), _ => true, }; is_valid &= attr_is_valid; @@ -171,6 +174,7 @@ impl CheckAttrVisitor<'_> { sym::no_implicit_prelude => { self.check_generic_attr(hir_id, attr, target, &[Target::Mod]) } + sym::rustc_object_lifetime_default => self.check_object_lifetime_default(hir_id), _ => {} } @@ -209,7 +213,14 @@ impl CheckAttrVisitor<'_> { } // FIXME(@lcnr): this doesn't belong here. - if matches!(target, Target::Closure | Target::Fn | Target::Method(_) | Target::ForeignFn) { + if matches!( + target, + Target::Closure + | Target::Fn + | Target::Method(_) + | Target::ForeignFn + | Target::ForeignStatic + ) { self.tcx.ensure().codegen_fn_attrs(self.tcx.hir().local_def_id(hir_id)); } @@ -402,6 +413,38 @@ impl CheckAttrVisitor<'_> { } } + /// Debugging aid for `object_lifetime_default` query. + fn check_object_lifetime_default(&self, hir_id: HirId) { + let tcx = self.tcx; + if let Some(generics) = tcx.hir().get_generics(tcx.hir().local_def_id(hir_id)) { + for p in generics.params { + let hir::GenericParamKind::Type { .. } = p.kind else { continue }; + let param_id = tcx.hir().local_def_id(p.hir_id); + let default = tcx.object_lifetime_default(param_id); + let repr = match default { + ObjectLifetimeDefault::Empty => "BaseDefault".to_owned(), + ObjectLifetimeDefault::Static => "'static".to_owned(), + ObjectLifetimeDefault::Param(def_id) => tcx.item_name(def_id).to_string(), + ObjectLifetimeDefault::Ambiguous => "Ambiguous".to_owned(), + }; + tcx.sess.span_err(p.span, &repr); + } + } + } + + /// Checks if `#[collapse_debuginfo]` is applied to a macro. + fn check_collapse_debuginfo(&self, attr: &Attribute, span: Span, target: Target) -> bool { + match target { + Target::MacroDef => true, + _ => { + self.tcx + .sess + .emit_err(errors::CollapseDebuginfo { attr_span: attr.span, defn_span: span }); + false + } + } + } + /// Checks if a `#[track_caller]` is applied to a non-naked function. Returns `true` if valid. fn check_track_caller( &self, @@ -632,6 +675,7 @@ impl CheckAttrVisitor<'_> { | Target::GlobalAsm | Target::TyAlias | Target::OpaqueTy + | Target::ImplTraitPlaceholder | Target::Enum | Target::Variant | Target::Struct @@ -644,7 +688,9 @@ impl CheckAttrVisitor<'_> { | Target::ForeignStatic | Target::ForeignTy | Target::GenericParam(..) - | Target::MacroDef => None, + | Target::MacroDef + | Target::PatField + | Target::ExprField => None, } { tcx.sess.emit_err(errors::DocAliasBadLocation { span, attr_str, location }); return false; @@ -1620,6 +1666,8 @@ impl CheckAttrVisitor<'_> { E0552, "unrecognized representation hint" ) + .help("valid reprs are `C`, `align`, `packed`, `transparent`, `simd`, `i8`, `u8`, \ + `i16`, `u16`, `i32`, `u32`, `i64`, `u64`, `i128`, `u128`, `isize`, `usize`") .emit(); continue; @@ -1886,6 +1934,16 @@ impl CheckAttrVisitor<'_> { } } + fn check_link_ordinal(&self, attr: &Attribute, _span: Span, target: Target) -> bool { + match target { + Target::ForeignFn | Target::ForeignStatic => true, + _ => { + self.tcx.sess.emit_err(errors::LinkOrdinal { attr_span: attr.span }); + false + } + } + } + fn check_deprecated(&self, hir_id: HirId, attr: &Attribute, _span: Span, target: Target) { match target { Target::Closure | Target::Expression | Target::Statement | Target::Arm => { @@ -2048,14 +2106,14 @@ impl<'tcx> Visitor<'tcx> for CheckAttrVisitor<'tcx> { intravisit::walk_expr(self, expr) } - fn visit_variant( - &mut self, - variant: &'tcx hir::Variant<'tcx>, - generics: &'tcx hir::Generics<'tcx>, - item_id: HirId, - ) { + fn visit_expr_field(&mut self, field: &'tcx hir::ExprField<'tcx>) { + self.check_attributes(field.hir_id, field.span, Target::ExprField, None); + intravisit::walk_expr_field(self, field) + } + + fn visit_variant(&mut self, variant: &'tcx hir::Variant<'tcx>) { self.check_attributes(variant.id, variant.span, Target::Variant, None); - intravisit::walk_variant(self, variant, generics, item_id) + intravisit::walk_variant(self, variant) } fn visit_param(&mut self, param: &'tcx hir::Param<'tcx>) { @@ -2063,6 +2121,11 @@ impl<'tcx> Visitor<'tcx> for CheckAttrVisitor<'tcx> { intravisit::walk_param(self, param); } + + fn visit_pat_field(&mut self, field: &'tcx hir::PatField<'tcx>) { + self.check_attributes(field.hir_id, field.span, Target::PatField, None); + intravisit::walk_pat_field(self, field); + } } fn is_c_like_enum(item: &Item<'_>) -> bool { @@ -2092,6 +2155,7 @@ fn check_invalid_crate_level_attr(tcx: TyCtxt<'_>, attrs: &[Attribute]) { sym::automatically_derived, sym::start, sym::rustc_main, + sym::unix_sigpipe, sym::derive, sym::test, sym::test_case, diff --git a/compiler/rustc_passes/src/dead.rs b/compiler/rustc_passes/src/dead.rs index 1e2fbeb38..f141d7bee 100644 --- a/compiler/rustc_passes/src/dead.rs +++ b/compiler/rustc_passes/src/dead.rs @@ -226,19 +226,16 @@ impl<'tcx> MarkSymbolVisitor<'tcx> { lhs: &hir::Pat<'_>, res: Res, pats: &[hir::Pat<'_>], - dotdot: Option<usize>, + dotdot: hir::DotDotPos, ) { let variant = match self.typeck_results().node_type(lhs.hir_id).kind() { ty::Adt(adt, _) => adt.variant_of_res(res), _ => span_bug!(lhs.span, "non-ADT in tuple struct pattern"), }; - let first_n = pats.iter().enumerate().take(dotdot.unwrap_or(pats.len())); + let dotdot = dotdot.as_opt_usize().unwrap_or(pats.len()); + let first_n = pats.iter().enumerate().take(dotdot); let missing = variant.fields.len() - pats.len(); - let last_n = pats - .iter() - .enumerate() - .skip(dotdot.unwrap_or(pats.len())) - .map(|(idx, pat)| (idx + missing, pat)); + let last_n = pats.iter().enumerate().skip(dotdot).map(|(idx, pat)| (idx + missing, pat)); for (idx, pat) in first_n.chain(last_n) { if let PatKind::Wild = pat.kind { continue; @@ -368,14 +365,7 @@ impl<'tcx> Visitor<'tcx> for MarkSymbolVisitor<'tcx> { self.maybe_typeck_results = old_maybe_typeck_results; } - fn visit_variant_data( - &mut self, - def: &'tcx hir::VariantData<'tcx>, - _: Symbol, - _: &hir::Generics<'_>, - _: hir::HirId, - _: rustc_span::Span, - ) { + fn visit_variant_data(&mut self, def: &'tcx hir::VariantData<'tcx>) { let tcx = self.tcx; let has_repr_c = self.repr_has_repr_c; let has_repr_simd = self.repr_has_repr_simd; @@ -457,7 +447,7 @@ impl<'tcx> Visitor<'tcx> for MarkSymbolVisitor<'tcx> { } fn visit_ty(&mut self, ty: &'tcx hir::Ty<'tcx>) { - if let TyKind::OpaqueDef(item_id, _) = ty.kind { + if let TyKind::OpaqueDef(item_id, _, _) = ty.kind { let item = self.tcx.hir().item(item_id); intravisit::walk_item(self, item); } diff --git a/compiler/rustc_passes/src/entry.rs b/compiler/rustc_passes/src/entry.rs index 7381019a6..cd10170d3 100644 --- a/compiler/rustc_passes/src/entry.rs +++ b/compiler/rustc_passes/src/entry.rs @@ -1,11 +1,11 @@ -use rustc_ast::{entry::EntryPointType, Attribute}; +use rustc_ast::entry::EntryPointType; use rustc_errors::struct_span_err; use rustc_hir::def::DefKind; use rustc_hir::def_id::{DefId, LocalDefId, CRATE_DEF_ID, LOCAL_CRATE}; use rustc_hir::{ItemId, Node, CRATE_HIR_ID}; use rustc_middle::ty::query::Providers; use rustc_middle::ty::{DefIdTree, TyCtxt}; -use rustc_session::config::{CrateType, EntryFnType}; +use rustc_session::config::{sigpipe, CrateType, EntryFnType}; use rustc_session::parse::feature_err; use rustc_span::symbol::sym; use rustc_span::{Span, Symbol, DUMMY_SP}; @@ -71,14 +71,12 @@ fn entry_point_type(ctxt: &EntryContext<'_>, id: ItemId, at_root: bool) -> Entry } } -fn err_if_attr_found(ctxt: &EntryContext<'_>, attrs: &[Attribute], sym: Symbol) { +fn err_if_attr_found(ctxt: &EntryContext<'_>, id: ItemId, sym: Symbol, details: &str) { + let attrs = ctxt.tcx.hir().attrs(id.hir_id()); if let Some(attr) = ctxt.tcx.sess.find_by_name(attrs, sym) { ctxt.tcx .sess - .struct_span_err( - attr.span, - &format!("`{}` attribute can only be used on functions", sym), - ) + .struct_span_err(attr.span, &format!("`{}` attribute {}", sym, details)) .emit(); } } @@ -87,14 +85,16 @@ fn find_item(id: ItemId, ctxt: &mut EntryContext<'_>) { let at_root = ctxt.tcx.opt_local_parent(id.def_id) == Some(CRATE_DEF_ID); match entry_point_type(ctxt, id, at_root) { - EntryPointType::None => (), + EntryPointType::None => { + err_if_attr_found(ctxt, id, sym::unix_sigpipe, "can only be used on `fn main()`"); + } _ if !matches!(ctxt.tcx.def_kind(id.def_id), DefKind::Fn) => { - let attrs = ctxt.tcx.hir().attrs(id.hir_id()); - err_if_attr_found(ctxt, attrs, sym::start); - err_if_attr_found(ctxt, attrs, sym::rustc_main); + err_if_attr_found(ctxt, id, sym::start, "can only be used on functions"); + err_if_attr_found(ctxt, id, sym::rustc_main, "can only be used on functions"); } EntryPointType::MainNamed => (), EntryPointType::OtherMain => { + err_if_attr_found(ctxt, id, sym::unix_sigpipe, "can only be used on root `fn main()`"); ctxt.non_main_fns.push(ctxt.tcx.def_span(id.def_id)); } EntryPointType::RustcMainAttr => { @@ -116,6 +116,7 @@ fn find_item(id: ItemId, ctxt: &mut EntryContext<'_>) { } } EntryPointType::Start => { + err_if_attr_found(ctxt, id, sym::unix_sigpipe, "can only be used on `fn main()`"); if ctxt.start_fn.is_none() { ctxt.start_fn = Some((id.def_id, ctxt.tcx.def_span(id.def_id.to_def_id()))); } else { @@ -136,8 +137,9 @@ fn find_item(id: ItemId, ctxt: &mut EntryContext<'_>) { fn configure_main(tcx: TyCtxt<'_>, visitor: &EntryContext<'_>) -> Option<(DefId, EntryFnType)> { if let Some((def_id, _)) = visitor.start_fn { Some((def_id.to_def_id(), EntryFnType::Start)) - } else if let Some((def_id, _)) = visitor.attr_main_fn { - Some((def_id.to_def_id(), EntryFnType::Main)) + } else if let Some((local_def_id, _)) = visitor.attr_main_fn { + let def_id = local_def_id.to_def_id(); + Some((def_id, EntryFnType::Main { sigpipe: sigpipe(tcx, def_id) })) } else { if let Some(main_def) = tcx.resolutions(()).main_def && let Some(def_id) = main_def.opt_fn_def_id() { // non-local main imports are handled below @@ -161,13 +163,39 @@ fn configure_main(tcx: TyCtxt<'_>, visitor: &EntryContext<'_>) -> Option<(DefId, ) .emit(); } - return Some((def_id, EntryFnType::Main)); + return Some((def_id, EntryFnType::Main { sigpipe: sigpipe(tcx, def_id) })); } no_main_err(tcx, visitor); None } } +fn sigpipe(tcx: TyCtxt<'_>, def_id: DefId) -> u8 { + if let Some(attr) = tcx.get_attr(def_id, sym::unix_sigpipe) { + match (attr.value_str(), attr.meta_item_list()) { + (Some(sym::inherit), None) => sigpipe::INHERIT, + (Some(sym::sig_ign), None) => sigpipe::SIG_IGN, + (Some(sym::sig_dfl), None) => sigpipe::SIG_DFL, + (_, Some(_)) => { + // Keep going so that `fn emit_malformed_attribute()` can print + // an excellent error message + sigpipe::DEFAULT + } + _ => { + tcx.sess + .struct_span_err( + attr.span, + "valid values for `#[unix_sigpipe = \"...\"]` are `inherit`, `sig_ign`, or `sig_dfl`", + ) + .emit(); + sigpipe::DEFAULT + } + } + } else { + sigpipe::DEFAULT + } +} + fn no_main_err(tcx: TyCtxt<'_>, visitor: &EntryContext<'_>) { let sp = tcx.def_span(CRATE_DEF_ID); if *tcx.sess.parse_sess.reached_eof.borrow() { diff --git a/compiler/rustc_passes/src/errors.rs b/compiler/rustc_passes/src/errors.rs index 5feb0e295..96cc8ae98 100644 --- a/compiler/rustc_passes/src/errors.rs +++ b/compiler/rustc_passes/src/errors.rs @@ -3,37 +3,37 @@ use rustc_macros::{LintDiagnostic, SessionDiagnostic, SessionSubdiagnostic}; use rustc_span::{Span, Symbol}; #[derive(LintDiagnostic)] -#[lint(passes::outer_crate_level_attr)] +#[diag(passes::outer_crate_level_attr)] pub struct OuterCrateLevelAttr; #[derive(LintDiagnostic)] -#[lint(passes::inner_crate_level_attr)] +#[diag(passes::inner_crate_level_attr)] pub struct InnerCrateLevelAttr; #[derive(LintDiagnostic)] -#[lint(passes::ignored_attr_with_macro)] +#[diag(passes::ignored_attr_with_macro)] pub struct IgnoredAttrWithMacro<'a> { pub sym: &'a str, } #[derive(LintDiagnostic)] -#[lint(passes::ignored_attr)] +#[diag(passes::ignored_attr)] pub struct IgnoredAttr<'a> { pub sym: &'a str, } #[derive(LintDiagnostic)] -#[lint(passes::inline_ignored_function_prototype)] +#[diag(passes::inline_ignored_function_prototype)] pub struct IgnoredInlineAttrFnProto; #[derive(LintDiagnostic)] -#[lint(passes::inline_ignored_constants)] -#[warn_] +#[diag(passes::inline_ignored_constants)] +#[warning] #[note] pub struct IgnoredInlineAttrConstants; #[derive(SessionDiagnostic)] -#[error(passes::inline_not_fn_or_closure, code = "E0518")] +#[diag(passes::inline_not_fn_or_closure, code = "E0518")] pub struct InlineNotFnOrClosure { #[primary_span] pub attr_span: Span, @@ -42,19 +42,19 @@ pub struct InlineNotFnOrClosure { } #[derive(LintDiagnostic)] -#[lint(passes::no_coverage_ignored_function_prototype)] +#[diag(passes::no_coverage_ignored_function_prototype)] pub struct IgnoredNoCoverageFnProto; #[derive(LintDiagnostic)] -#[lint(passes::no_coverage_propagate)] +#[diag(passes::no_coverage_propagate)] pub struct IgnoredNoCoveragePropagate; #[derive(LintDiagnostic)] -#[lint(passes::no_coverage_fn_defn)] +#[diag(passes::no_coverage_fn_defn)] pub struct IgnoredNoCoverageFnDefn; #[derive(SessionDiagnostic)] -#[error(passes::no_coverage_not_coverable, code = "E0788")] +#[diag(passes::no_coverage_not_coverable, code = "E0788")] pub struct IgnoredNoCoverageNotCoverable { #[primary_span] pub attr_span: Span, @@ -63,7 +63,7 @@ pub struct IgnoredNoCoverageNotCoverable { } #[derive(SessionDiagnostic)] -#[error(passes::should_be_applied_to_fn)] +#[diag(passes::should_be_applied_to_fn)] pub struct AttrShouldBeAppliedToFn { #[primary_span] pub attr_span: Span, @@ -72,14 +72,14 @@ pub struct AttrShouldBeAppliedToFn { } #[derive(SessionDiagnostic)] -#[error(passes::naked_tracked_caller, code = "E0736")] +#[diag(passes::naked_tracked_caller, code = "E0736")] pub struct NakedTrackedCaller { #[primary_span] pub attr_span: Span, } #[derive(SessionDiagnostic)] -#[error(passes::should_be_applied_to_fn, code = "E0739")] +#[diag(passes::should_be_applied_to_fn, code = "E0739")] pub struct TrackedCallerWrongLocation { #[primary_span] pub attr_span: Span, @@ -88,7 +88,7 @@ pub struct TrackedCallerWrongLocation { } #[derive(SessionDiagnostic)] -#[error(passes::should_be_applied_to_struct_enum, code = "E0701")] +#[diag(passes::should_be_applied_to_struct_enum, code = "E0701")] pub struct NonExhaustiveWrongLocation { #[primary_span] pub attr_span: Span, @@ -97,7 +97,7 @@ pub struct NonExhaustiveWrongLocation { } #[derive(SessionDiagnostic)] -#[error(passes::should_be_applied_to_trait)] +#[diag(passes::should_be_applied_to_trait)] pub struct AttrShouldBeAppliedToTrait { #[primary_span] pub attr_span: Span, @@ -106,11 +106,11 @@ pub struct AttrShouldBeAppliedToTrait { } #[derive(LintDiagnostic)] -#[lint(passes::target_feature_on_statement)] +#[diag(passes::target_feature_on_statement)] pub struct TargetFeatureOnStatement; #[derive(SessionDiagnostic)] -#[error(passes::should_be_applied_to_static)] +#[diag(passes::should_be_applied_to_static)] pub struct AttrShouldBeAppliedToStatic { #[primary_span] pub attr_span: Span, @@ -119,7 +119,7 @@ pub struct AttrShouldBeAppliedToStatic { } #[derive(SessionDiagnostic)] -#[error(passes::doc_expect_str)] +#[diag(passes::doc_expect_str)] pub struct DocExpectStr<'a> { #[primary_span] pub attr_span: Span, @@ -127,7 +127,7 @@ pub struct DocExpectStr<'a> { } #[derive(SessionDiagnostic)] -#[error(passes::doc_alias_empty)] +#[diag(passes::doc_alias_empty)] pub struct DocAliasEmpty<'a> { #[primary_span] pub span: Span, @@ -135,7 +135,7 @@ pub struct DocAliasEmpty<'a> { } #[derive(SessionDiagnostic)] -#[error(passes::doc_alias_bad_char)] +#[diag(passes::doc_alias_bad_char)] pub struct DocAliasBadChar<'a> { #[primary_span] pub span: Span, @@ -144,7 +144,7 @@ pub struct DocAliasBadChar<'a> { } #[derive(SessionDiagnostic)] -#[error(passes::doc_alias_start_end)] +#[diag(passes::doc_alias_start_end)] pub struct DocAliasStartEnd<'a> { #[primary_span] pub span: Span, @@ -152,7 +152,7 @@ pub struct DocAliasStartEnd<'a> { } #[derive(SessionDiagnostic)] -#[error(passes::doc_alias_bad_location)] +#[diag(passes::doc_alias_bad_location)] pub struct DocAliasBadLocation<'a> { #[primary_span] pub span: Span, @@ -161,7 +161,7 @@ pub struct DocAliasBadLocation<'a> { } #[derive(SessionDiagnostic)] -#[error(passes::doc_alias_not_an_alias)] +#[diag(passes::doc_alias_not_an_alias)] pub struct DocAliasNotAnAlias<'a> { #[primary_span] pub span: Span, @@ -169,42 +169,42 @@ pub struct DocAliasNotAnAlias<'a> { } #[derive(LintDiagnostic)] -#[lint(passes::doc_alias_duplicated)] +#[diag(passes::doc_alias_duplicated)] pub struct DocAliasDuplicated { #[label] pub first_defn: Span, } #[derive(SessionDiagnostic)] -#[error(passes::doc_alias_not_string_literal)] +#[diag(passes::doc_alias_not_string_literal)] pub struct DocAliasNotStringLiteral { #[primary_span] pub span: Span, } #[derive(SessionDiagnostic)] -#[error(passes::doc_alias_malformed)] +#[diag(passes::doc_alias_malformed)] pub struct DocAliasMalformed { #[primary_span] pub span: Span, } #[derive(SessionDiagnostic)] -#[error(passes::doc_keyword_empty_mod)] +#[diag(passes::doc_keyword_empty_mod)] pub struct DocKeywordEmptyMod { #[primary_span] pub span: Span, } #[derive(SessionDiagnostic)] -#[error(passes::doc_keyword_not_mod)] +#[diag(passes::doc_keyword_not_mod)] pub struct DocKeywordNotMod { #[primary_span] pub span: Span, } #[derive(SessionDiagnostic)] -#[error(passes::doc_keyword_invalid_ident)] +#[diag(passes::doc_keyword_invalid_ident)] pub struct DocKeywordInvalidIdent { #[primary_span] pub span: Span, @@ -212,21 +212,21 @@ pub struct DocKeywordInvalidIdent { } #[derive(SessionDiagnostic)] -#[error(passes::doc_fake_variadic_not_valid)] +#[diag(passes::doc_fake_variadic_not_valid)] pub struct DocFakeVariadicNotValid { #[primary_span] pub span: Span, } #[derive(SessionDiagnostic)] -#[error(passes::doc_keyword_only_impl)] +#[diag(passes::doc_keyword_only_impl)] pub struct DocKeywordOnlyImpl { #[primary_span] pub span: Span, } #[derive(SessionDiagnostic)] -#[error(passes::doc_inline_conflict)] +#[diag(passes::doc_inline_conflict)] #[help] pub struct DocKeywordConflict { #[primary_span] @@ -234,7 +234,7 @@ pub struct DocKeywordConflict { } #[derive(LintDiagnostic)] -#[lint(passes::doc_inline_only_use)] +#[diag(passes::doc_inline_only_use)] #[note] pub struct DocInlineOnlyUse { #[label] @@ -244,7 +244,7 @@ pub struct DocInlineOnlyUse { } #[derive(SessionDiagnostic)] -#[error(passes::doc_attr_not_crate_level)] +#[diag(passes::doc_attr_not_crate_level)] pub struct DocAttrNotCrateLevel<'a> { #[primary_span] pub span: Span, @@ -252,27 +252,27 @@ pub struct DocAttrNotCrateLevel<'a> { } #[derive(LintDiagnostic)] -#[lint(passes::doc_test_unknown)] +#[diag(passes::doc_test_unknown)] pub struct DocTestUnknown { pub path: String, } #[derive(LintDiagnostic)] -#[lint(passes::doc_test_takes_list)] +#[diag(passes::doc_test_takes_list)] pub struct DocTestTakesList; #[derive(LintDiagnostic)] -#[lint(passes::doc_primitive)] +#[diag(passes::doc_primitive)] pub struct DocPrimitive; #[derive(LintDiagnostic)] -#[lint(passes::doc_test_unknown_any)] +#[diag(passes::doc_test_unknown_any)] pub struct DocTestUnknownAny { pub path: String, } #[derive(LintDiagnostic)] -#[lint(passes::doc_test_unknown_spotlight)] +#[diag(passes::doc_test_unknown_spotlight)] #[note] #[note(passes::no_op_note)] pub struct DocTestUnknownSpotlight { @@ -282,7 +282,7 @@ pub struct DocTestUnknownSpotlight { } #[derive(LintDiagnostic)] -#[lint(passes::doc_test_unknown_include)] +#[diag(passes::doc_test_unknown_include)] pub struct DocTestUnknownInclude { pub path: String, pub value: String, @@ -292,11 +292,11 @@ pub struct DocTestUnknownInclude { } #[derive(LintDiagnostic)] -#[lint(passes::doc_invalid)] +#[diag(passes::doc_invalid)] pub struct DocInvalid; #[derive(SessionDiagnostic)] -#[error(passes::pass_by_value)] +#[diag(passes::pass_by_value)] pub struct PassByValue { #[primary_span] pub attr_span: Span, @@ -305,7 +305,7 @@ pub struct PassByValue { } #[derive(SessionDiagnostic)] -#[error(passes::allow_incoherent_impl)] +#[diag(passes::allow_incoherent_impl)] pub struct AllowIncoherentImpl { #[primary_span] pub attr_span: Span, @@ -314,7 +314,7 @@ pub struct AllowIncoherentImpl { } #[derive(SessionDiagnostic)] -#[error(passes::has_incoherent_inherent_impl)] +#[diag(passes::has_incoherent_inherent_impl)] pub struct HasIncoherentInherentImpl { #[primary_span] pub attr_span: Span, @@ -323,21 +323,21 @@ pub struct HasIncoherentInherentImpl { } #[derive(LintDiagnostic)] -#[lint(passes::must_use_async)] +#[diag(passes::must_use_async)] pub struct MustUseAsync { #[label] pub span: Span, } #[derive(LintDiagnostic)] -#[lint(passes::must_use_no_effect)] +#[diag(passes::must_use_no_effect)] pub struct MustUseNoEffect { pub article: &'static str, pub target: rustc_hir::Target, } #[derive(SessionDiagnostic)] -#[error(passes::must_not_suspend)] +#[diag(passes::must_not_suspend)] pub struct MustNotSuspend { #[primary_span] pub attr_span: Span, @@ -346,24 +346,24 @@ pub struct MustNotSuspend { } #[derive(LintDiagnostic)] -#[lint(passes::cold)] -#[warn_] +#[diag(passes::cold)] +#[warning] pub struct Cold { #[label] pub span: Span, } #[derive(LintDiagnostic)] -#[lint(passes::link)] -#[warn_] +#[diag(passes::link)] +#[warning] pub struct Link { #[label] pub span: Option<Span>, } #[derive(LintDiagnostic)] -#[lint(passes::link_name)] -#[warn_] +#[diag(passes::link_name)] +#[warning] pub struct LinkName<'a> { #[help] pub attr_span: Option<Span>, @@ -373,7 +373,7 @@ pub struct LinkName<'a> { } #[derive(SessionDiagnostic)] -#[error(passes::no_link)] +#[diag(passes::no_link)] pub struct NoLink { #[primary_span] pub attr_span: Span, @@ -382,7 +382,7 @@ pub struct NoLink { } #[derive(SessionDiagnostic)] -#[error(passes::export_name)] +#[diag(passes::export_name)] pub struct ExportName { #[primary_span] pub attr_span: Span, @@ -391,7 +391,7 @@ pub struct ExportName { } #[derive(SessionDiagnostic)] -#[error(passes::rustc_layout_scalar_valid_range_not_struct)] +#[diag(passes::rustc_layout_scalar_valid_range_not_struct)] pub struct RustcLayoutScalarValidRangeNotStruct { #[primary_span] pub attr_span: Span, @@ -400,14 +400,14 @@ pub struct RustcLayoutScalarValidRangeNotStruct { } #[derive(SessionDiagnostic)] -#[error(passes::rustc_layout_scalar_valid_range_arg)] +#[diag(passes::rustc_layout_scalar_valid_range_arg)] pub struct RustcLayoutScalarValidRangeArg { #[primary_span] pub attr_span: Span, } #[derive(SessionDiagnostic)] -#[error(passes::rustc_legacy_const_generics_only)] +#[diag(passes::rustc_legacy_const_generics_only)] pub struct RustcLegacyConstGenericsOnly { #[primary_span] pub attr_span: Span, @@ -416,7 +416,7 @@ pub struct RustcLegacyConstGenericsOnly { } #[derive(SessionDiagnostic)] -#[error(passes::rustc_legacy_const_generics_index)] +#[diag(passes::rustc_legacy_const_generics_index)] pub struct RustcLegacyConstGenericsIndex { #[primary_span] pub attr_span: Span, @@ -425,7 +425,7 @@ pub struct RustcLegacyConstGenericsIndex { } #[derive(SessionDiagnostic)] -#[error(passes::rustc_legacy_const_generics_index_exceed)] +#[diag(passes::rustc_legacy_const_generics_index_exceed)] pub struct RustcLegacyConstGenericsIndexExceed { #[primary_span] #[label] @@ -434,30 +434,30 @@ pub struct RustcLegacyConstGenericsIndexExceed { } #[derive(SessionDiagnostic)] -#[error(passes::rustc_legacy_const_generics_index_negative)] +#[diag(passes::rustc_legacy_const_generics_index_negative)] pub struct RustcLegacyConstGenericsIndexNegative { #[primary_span] pub invalid_args: Vec<Span>, } #[derive(SessionDiagnostic)] -#[error(passes::rustc_dirty_clean)] +#[diag(passes::rustc_dirty_clean)] pub struct RustcDirtyClean { #[primary_span] pub span: Span, } #[derive(LintDiagnostic)] -#[lint(passes::link_section)] -#[warn_] +#[diag(passes::link_section)] +#[warning] pub struct LinkSection { #[label] pub span: Span, } #[derive(LintDiagnostic)] -#[lint(passes::no_mangle_foreign)] -#[warn_] +#[diag(passes::no_mangle_foreign)] +#[warning] #[note] pub struct NoMangleForeign { #[label] @@ -468,40 +468,40 @@ pub struct NoMangleForeign { } #[derive(LintDiagnostic)] -#[lint(passes::no_mangle)] -#[warn_] +#[diag(passes::no_mangle)] +#[warning] pub struct NoMangle { #[label] pub span: Span, } #[derive(SessionDiagnostic)] -#[error(passes::repr_ident, code = "E0565")] +#[diag(passes::repr_ident, code = "E0565")] pub struct ReprIdent { #[primary_span] pub span: Span, } #[derive(LintDiagnostic)] -#[lint(passes::repr_conflicting, code = "E0566")] +#[diag(passes::repr_conflicting, code = "E0566")] pub struct ReprConflicting; #[derive(SessionDiagnostic)] -#[error(passes::used_static)] +#[diag(passes::used_static)] pub struct UsedStatic { #[primary_span] pub span: Span, } #[derive(SessionDiagnostic)] -#[error(passes::used_compiler_linker)] +#[diag(passes::used_compiler_linker)] pub struct UsedCompilerLinker { #[primary_span] pub spans: Vec<Span>, } #[derive(SessionDiagnostic)] -#[error(passes::allow_internal_unstable)] +#[diag(passes::allow_internal_unstable)] pub struct AllowInternalUnstable { #[primary_span] pub attr_span: Span, @@ -510,14 +510,14 @@ pub struct AllowInternalUnstable { } #[derive(SessionDiagnostic)] -#[error(passes::debug_visualizer_placement)] +#[diag(passes::debug_visualizer_placement)] pub struct DebugVisualizerPlacement { #[primary_span] pub span: Span, } #[derive(SessionDiagnostic)] -#[error(passes::debug_visualizer_invalid)] +#[diag(passes::debug_visualizer_invalid)] #[note(passes::note_1)] #[note(passes::note_2)] #[note(passes::note_3)] @@ -527,7 +527,7 @@ pub struct DebugVisualizerInvalid { } #[derive(SessionDiagnostic)] -#[error(passes::rustc_allow_const_fn_unstable)] +#[diag(passes::rustc_allow_const_fn_unstable)] pub struct RustcAllowConstFnUnstable { #[primary_span] pub attr_span: Span, @@ -536,7 +536,7 @@ pub struct RustcAllowConstFnUnstable { } #[derive(SessionDiagnostic)] -#[error(passes::rustc_std_internal_symbol)] +#[diag(passes::rustc_std_internal_symbol)] pub struct RustcStdInternalSymbol { #[primary_span] pub attr_span: Span, @@ -545,35 +545,42 @@ pub struct RustcStdInternalSymbol { } #[derive(SessionDiagnostic)] -#[error(passes::const_trait)] +#[diag(passes::const_trait)] pub struct ConstTrait { #[primary_span] pub attr_span: Span, } #[derive(SessionDiagnostic)] -#[error(passes::stability_promotable)] +#[diag(passes::link_ordinal)] +pub struct LinkOrdinal { + #[primary_span] + pub attr_span: Span, +} + +#[derive(SessionDiagnostic)] +#[diag(passes::stability_promotable)] pub struct StabilityPromotable { #[primary_span] pub attr_span: Span, } #[derive(LintDiagnostic)] -#[lint(passes::deprecated)] +#[diag(passes::deprecated)] pub struct Deprecated; #[derive(LintDiagnostic)] -#[lint(passes::macro_use)] +#[diag(passes::macro_use)] pub struct MacroUse { pub name: Symbol, } #[derive(LintDiagnostic)] -#[lint(passes::macro_export)] +#[diag(passes::macro_export)] pub struct MacroExport; #[derive(LintDiagnostic)] -#[lint(passes::plugin_registrar)] +#[diag(passes::plugin_registrar)] pub struct PluginRegistrar; #[derive(SessionSubdiagnostic)] @@ -587,7 +594,7 @@ pub enum UnusedNote { } #[derive(LintDiagnostic)] -#[lint(passes::unused)] +#[diag(passes::unused)] pub struct Unused { #[suggestion(applicability = "machine-applicable")] pub attr_span: Span, @@ -596,7 +603,7 @@ pub struct Unused { } #[derive(SessionDiagnostic)] -#[error(passes::non_exported_macro_invalid_attrs, code = "E0518")] +#[diag(passes::non_exported_macro_invalid_attrs, code = "E0518")] pub struct NonExportedMacroInvalidAttrs { #[primary_span] #[label] @@ -604,19 +611,18 @@ pub struct NonExportedMacroInvalidAttrs { } #[derive(LintDiagnostic)] -#[lint(passes::unused_duplicate)] +#[diag(passes::unused_duplicate)] pub struct UnusedDuplicate { - #[primary_span] #[suggestion(code = "", applicability = "machine-applicable")] pub this: Span, #[note] pub other: Span, - #[warn_] + #[warning] pub warning: Option<()>, } #[derive(SessionDiagnostic)] -#[error(passes::unused_multiple)] +#[diag(passes::unused_multiple)] pub struct UnusedMultiple { #[primary_span] #[suggestion(code = "", applicability = "machine-applicable")] @@ -627,7 +633,7 @@ pub struct UnusedMultiple { } #[derive(SessionDiagnostic)] -#[error(passes::rustc_lint_opt_ty)] +#[diag(passes::rustc_lint_opt_ty)] pub struct RustcLintOptTy { #[primary_span] pub attr_span: Span, @@ -636,10 +642,19 @@ pub struct RustcLintOptTy { } #[derive(SessionDiagnostic)] -#[error(passes::rustc_lint_opt_deny_field_access)] +#[diag(passes::rustc_lint_opt_deny_field_access)] pub struct RustcLintOptDenyFieldAccess { #[primary_span] pub attr_span: Span, #[label] pub span: Span, } + +#[derive(SessionDiagnostic)] +#[diag(passes::collapse_debuginfo)] +pub struct CollapseDebuginfo { + #[primary_span] + pub attr_span: Span, + #[label] + pub defn_span: Span, +} diff --git a/compiler/rustc_passes/src/hir_id_validator.rs b/compiler/rustc_passes/src/hir_id_validator.rs index 212ea9e57..3bb8c0bb4 100644 --- a/compiler/rustc_passes/src/hir_id_validator.rs +++ b/compiler/rustc_passes/src/hir_id_validator.rs @@ -103,7 +103,7 @@ impl<'a, 'hir> HirIdValidator<'a, 'hir> { self.error(|| { format!( "ItemLocalIds not assigned densely in {}. \ - Max ItemLocalId = {}, missing IDs = {:?}; seens IDs = {:?}", + Max ItemLocalId = {}, missing IDs = {:#?}; seens IDs = {:#?}", self.hir_map.def_path(owner).to_string_no_crate_verbose(), max, missing_items, diff --git a/compiler/rustc_passes/src/hir_stats.rs b/compiler/rustc_passes/src/hir_stats.rs index a3be827a7..0be2fc053 100644 --- a/compiler/rustc_passes/src/hir_stats.rs +++ b/compiler/rustc_passes/src/hir_stats.rs @@ -21,75 +21,169 @@ enum Id { None, } -struct NodeData { +struct NodeStats { count: usize, size: usize, } +impl NodeStats { + fn new() -> NodeStats { + NodeStats { count: 0, size: 0 } + } +} + +struct Node { + stats: NodeStats, + subnodes: FxHashMap<&'static str, NodeStats>, +} + +impl Node { + fn new() -> Node { + Node { stats: NodeStats::new(), subnodes: FxHashMap::default() } + } +} + +/// This type measures the size of AST and HIR nodes, by implementing the AST +/// and HIR `Visitor` traits. But we don't measure every visited type because +/// that could cause double counting. +/// +/// For example, `ast::Visitor` has `visit_ident`, but `Ident`s are always +/// stored inline within other AST nodes, so we don't implement `visit_ident` +/// here. In contrast, we do implement `visit_expr` because `ast::Expr` is +/// always stored as `P<ast::Expr>`, and every such expression should be +/// measured separately. +/// +/// In general, a `visit_foo` method should be implemented here if the +/// corresponding `Foo` type is always stored on its own, e.g.: `P<Foo>`, +/// `Box<Foo>`, `Vec<Foo>`, `Box<[Foo]>`. +/// +/// There are some types in the AST and HIR tree that the visitors do not have +/// a `visit_*` method for, and so we cannot measure these, which is +/// unfortunate. struct StatCollector<'k> { krate: Option<Map<'k>>, - data: FxHashMap<&'static str, NodeData>, + nodes: FxHashMap<&'static str, Node>, seen: FxHashSet<Id>, } pub fn print_hir_stats(tcx: TyCtxt<'_>) { let mut collector = StatCollector { krate: Some(tcx.hir()), - data: FxHashMap::default(), + nodes: FxHashMap::default(), seen: FxHashSet::default(), }; tcx.hir().walk_toplevel_module(&mut collector); tcx.hir().walk_attributes(&mut collector); - collector.print("HIR STATS"); + collector.print("HIR STATS", "hir-stats"); } -pub fn print_ast_stats(krate: &ast::Crate, title: &str) { +pub fn print_ast_stats(krate: &ast::Crate, title: &str, prefix: &str) { + use rustc_ast::visit::Visitor; + let mut collector = - StatCollector { krate: None, data: FxHashMap::default(), seen: FxHashSet::default() }; - ast_visit::walk_crate(&mut collector, krate); - collector.print(title); + StatCollector { krate: None, nodes: FxHashMap::default(), seen: FxHashSet::default() }; + collector.visit_crate(krate); + collector.print(title, prefix); } impl<'k> StatCollector<'k> { - fn record<T>(&mut self, label: &'static str, id: Id, node: &T) { + // Record a top-level node. + fn record<T>(&mut self, label: &'static str, id: Id, val: &T) { + self.record_inner(label, None, id, val); + } + + // Record a two-level entry, with a top-level enum type and a variant. + fn record_variant<T>(&mut self, label1: &'static str, label2: &'static str, id: Id, val: &T) { + self.record_inner(label1, Some(label2), id, val); + } + + fn record_inner<T>( + &mut self, + label1: &'static str, + label2: Option<&'static str>, + id: Id, + val: &T, + ) { if id != Id::None && !self.seen.insert(id) { return; } - let entry = self.data.entry(label).or_insert(NodeData { count: 0, size: 0 }); + let node = self.nodes.entry(label1).or_insert(Node::new()); + node.stats.count += 1; + node.stats.size = std::mem::size_of_val(val); - entry.count += 1; - entry.size = std::mem::size_of_val(node); + if let Some(label2) = label2 { + let subnode = node.subnodes.entry(label2).or_insert(NodeStats::new()); + subnode.count += 1; + subnode.size = std::mem::size_of_val(val); + } } - fn print(&self, title: &str) { - let mut stats: Vec<_> = self.data.iter().collect(); - - stats.sort_by_key(|&(_, ref d)| d.count * d.size); + fn print(&self, title: &str, prefix: &str) { + let mut nodes: Vec<_> = self.nodes.iter().collect(); + nodes.sort_by_key(|&(_, ref node)| node.stats.count * node.stats.size); - let mut total_size = 0; + let total_size = nodes.iter().map(|(_, node)| node.stats.count * node.stats.size).sum(); - eprintln!("\n{}\n", title); + eprintln!("{} {}", prefix, title); + eprintln!( + "{} {:<18}{:>18}{:>14}{:>14}", + prefix, "Name", "Accumulated Size", "Count", "Item Size" + ); + eprintln!("{} ----------------------------------------------------------------", prefix); - eprintln!("{:<18}{:>18}{:>14}{:>14}", "Name", "Accumulated Size", "Count", "Item Size"); - eprintln!("----------------------------------------------------------------"); + let percent = |m, n| (m * 100) as f64 / n as f64; - for (label, data) in stats { + for (label, node) in nodes { + let size = node.stats.count * node.stats.size; eprintln!( - "{:<18}{:>18}{:>14}{:>14}", + "{} {:<18}{:>10} ({:4.1}%){:>14}{:>14}", + prefix, label, - to_readable_str(data.count * data.size), - to_readable_str(data.count), - to_readable_str(data.size) + to_readable_str(size), + percent(size, total_size), + to_readable_str(node.stats.count), + to_readable_str(node.stats.size) ); - - total_size += data.count * data.size; + if !node.subnodes.is_empty() { + let mut subnodes: Vec<_> = node.subnodes.iter().collect(); + subnodes.sort_by_key(|&(_, ref subnode)| subnode.count * subnode.size); + + for (label, subnode) in subnodes { + let size = subnode.count * subnode.size; + eprintln!( + "{} - {:<18}{:>10} ({:4.1}%){:>14}", + prefix, + label, + to_readable_str(size), + percent(size, total_size), + to_readable_str(subnode.count), + ); + } + } } - eprintln!("----------------------------------------------------------------"); - eprintln!("{:<18}{:>18}\n", "Total", to_readable_str(total_size)); + eprintln!("{} ----------------------------------------------------------------", prefix); + eprintln!("{} {:<18}{:>10}", prefix, "Total", to_readable_str(total_size)); + eprintln!("{}", prefix); } } +// Used to avoid boilerplate for types with many variants. +macro_rules! record_variants { + ( + ($self:ident, $val:expr, $kind:expr, $id:expr, $mod:ident, $ty:ty, $tykind:ident), + [$($variant:ident),*] + ) => { + match $kind { + $( + $mod::$tykind::$variant { .. } => { + $self.record_variant(stringify!($ty), stringify!($variant), $id, $val) + } + )* + } + }; +} + impl<'v> hir_visit::Visitor<'v> for StatCollector<'v> { fn visit_param(&mut self, param: &'v hir::Param<'v>) { self.record("Param", Id::Node(param.hir_id), param); @@ -122,12 +216,46 @@ impl<'v> hir_visit::Visitor<'v> for StatCollector<'v> { } fn visit_item(&mut self, i: &'v hir::Item<'v>) { - self.record("Item", Id::Node(i.hir_id()), i); + record_variants!( + (self, i, i.kind, Id::Node(i.hir_id()), hir, Item, ItemKind), + [ + ExternCrate, + Use, + Static, + Const, + Fn, + Macro, + Mod, + ForeignMod, + GlobalAsm, + TyAlias, + OpaqueTy, + Enum, + Struct, + Union, + Trait, + TraitAlias, + Impl + ] + ); hir_visit::walk_item(self, i) } + fn visit_body(&mut self, b: &'v hir::Body<'v>) { + self.record("Body", Id::None, b); + hir_visit::walk_body(self, b); + } + + fn visit_mod(&mut self, m: &'v hir::Mod<'v>, _s: Span, n: HirId) { + self.record("Mod", Id::None, m); + hir_visit::walk_mod(self, m, n) + } + fn visit_foreign_item(&mut self, i: &'v hir::ForeignItem<'v>) { - self.record("ForeignItem", Id::Node(i.hir_id()), i); + record_variants!( + (self, i, i.kind, Id::Node(i.hir_id()), hir, ForeignItem, ForeignItemKind), + [Fn, Static, Type] + ); hir_visit::walk_foreign_item(self, i) } @@ -142,7 +270,10 @@ impl<'v> hir_visit::Visitor<'v> for StatCollector<'v> { } fn visit_stmt(&mut self, s: &'v hir::Stmt<'v>) { - self.record("Stmt", Id::Node(s.hir_id), s); + record_variants!( + (self, s, s.kind, Id::Node(s.hir_id), hir, Stmt, StmtKind), + [Local, Item, Expr, Semi] + ); hir_visit::walk_stmt(self, s) } @@ -152,50 +283,135 @@ impl<'v> hir_visit::Visitor<'v> for StatCollector<'v> { } fn visit_pat(&mut self, p: &'v hir::Pat<'v>) { - self.record("Pat", Id::Node(p.hir_id), p); + record_variants!( + (self, p, p.kind, Id::Node(p.hir_id), hir, Pat, PatKind), + [Wild, Binding, Struct, TupleStruct, Or, Path, Tuple, Box, Ref, Lit, Range, Slice] + ); hir_visit::walk_pat(self, p) } - fn visit_expr(&mut self, ex: &'v hir::Expr<'v>) { - self.record("Expr", Id::Node(ex.hir_id), ex); - hir_visit::walk_expr(self, ex) + fn visit_pat_field(&mut self, f: &'v hir::PatField<'v>) { + self.record("PatField", Id::Node(f.hir_id), f); + hir_visit::walk_pat_field(self, f) + } + + fn visit_expr(&mut self, e: &'v hir::Expr<'v>) { + record_variants!( + (self, e, e.kind, Id::Node(e.hir_id), hir, Expr, ExprKind), + [ + Box, ConstBlock, Array, Call, MethodCall, Tup, Binary, Unary, Lit, Cast, Type, + DropTemps, Let, If, Loop, Match, Closure, Block, Assign, AssignOp, Field, Index, + Path, AddrOf, Break, Continue, Ret, InlineAsm, Struct, Repeat, Yield, Err + ] + ); + hir_visit::walk_expr(self, e) + } + + fn visit_let_expr(&mut self, lex: &'v hir::Let<'v>) { + self.record("Let", Id::Node(lex.hir_id), lex); + hir_visit::walk_let_expr(self, lex) + } + + fn visit_expr_field(&mut self, f: &'v hir::ExprField<'v>) { + self.record("ExprField", Id::Node(f.hir_id), f); + hir_visit::walk_expr_field(self, f) } fn visit_ty(&mut self, t: &'v hir::Ty<'v>) { - self.record("Ty", Id::Node(t.hir_id), t); + record_variants!( + (self, t, t.kind, Id::Node(t.hir_id), hir, Ty, TyKind), + [ + Slice, + Array, + Ptr, + Rptr, + BareFn, + Never, + Tup, + Path, + OpaqueDef, + TraitObject, + Typeof, + Infer, + Err + ] + ); hir_visit::walk_ty(self, t) } + fn visit_generic_param(&mut self, p: &'v hir::GenericParam<'v>) { + self.record("GenericParam", Id::Node(p.hir_id), p); + hir_visit::walk_generic_param(self, p) + } + + fn visit_generics(&mut self, g: &'v hir::Generics<'v>) { + self.record("Generics", Id::None, g); + hir_visit::walk_generics(self, g) + } + + fn visit_where_predicate(&mut self, p: &'v hir::WherePredicate<'v>) { + record_variants!( + (self, p, p, Id::None, hir, WherePredicate, WherePredicate), + [BoundPredicate, RegionPredicate, EqPredicate] + ); + hir_visit::walk_where_predicate(self, p) + } + fn visit_fn( &mut self, fk: hir_visit::FnKind<'v>, fd: &'v hir::FnDecl<'v>, b: hir::BodyId, - s: Span, + _: Span, id: hir::HirId, ) { self.record("FnDecl", Id::None, fd); - hir_visit::walk_fn(self, fk, fd, b, s, id) + hir_visit::walk_fn(self, fk, fd, b, id) } - fn visit_where_predicate(&mut self, predicate: &'v hir::WherePredicate<'v>) { - self.record("WherePredicate", Id::None, predicate); - hir_visit::walk_where_predicate(self, predicate) + fn visit_use(&mut self, p: &'v hir::Path<'v>, hir_id: hir::HirId) { + // This is `visit_use`, but the type is `Path` so record it that way. + self.record("Path", Id::None, p); + hir_visit::walk_use(self, p, hir_id) } fn visit_trait_item(&mut self, ti: &'v hir::TraitItem<'v>) { - self.record("TraitItem", Id::Node(ti.hir_id()), ti); + record_variants!( + (self, ti, ti.kind, Id::Node(ti.hir_id()), hir, TraitItem, TraitItemKind), + [Const, Fn, Type] + ); hir_visit::walk_trait_item(self, ti) } + fn visit_trait_item_ref(&mut self, ti: &'v hir::TraitItemRef) { + self.record("TraitItemRef", Id::Node(ti.id.hir_id()), ti); + hir_visit::walk_trait_item_ref(self, ti) + } + fn visit_impl_item(&mut self, ii: &'v hir::ImplItem<'v>) { - self.record("ImplItem", Id::Node(ii.hir_id()), ii); + record_variants!( + (self, ii, ii.kind, Id::Node(ii.hir_id()), hir, ImplItem, ImplItemKind), + [Const, Fn, TyAlias] + ); hir_visit::walk_impl_item(self, ii) } - fn visit_param_bound(&mut self, bounds: &'v hir::GenericBound<'v>) { - self.record("GenericBound", Id::None, bounds); - hir_visit::walk_param_bound(self, bounds) + fn visit_foreign_item_ref(&mut self, fi: &'v hir::ForeignItemRef) { + self.record("ForeignItemRef", Id::Node(fi.id.hir_id()), fi); + hir_visit::walk_foreign_item_ref(self, fi) + } + + fn visit_impl_item_ref(&mut self, ii: &'v hir::ImplItemRef) { + self.record("ImplItemRef", Id::Node(ii.id.hir_id()), ii); + hir_visit::walk_impl_item_ref(self, ii) + } + + fn visit_param_bound(&mut self, b: &'v hir::GenericBound<'v>) { + record_variants!( + (self, b, b, Id::None, hir, GenericBound, GenericBound), + [Trait, LangItemTrait, Outlives] + ); + hir_visit::walk_param_bound(self, b) } fn visit_field_def(&mut self, s: &'v hir::FieldDef<'v>) { @@ -203,14 +419,22 @@ impl<'v> hir_visit::Visitor<'v> for StatCollector<'v> { hir_visit::walk_field_def(self, s) } - fn visit_variant( - &mut self, - v: &'v hir::Variant<'v>, - g: &'v hir::Generics<'v>, - item_id: hir::HirId, - ) { + fn visit_variant(&mut self, v: &'v hir::Variant<'v>) { self.record("Variant", Id::None, v); - hir_visit::walk_variant(self, v, g, item_id) + hir_visit::walk_variant(self, v) + } + + fn visit_generic_arg(&mut self, ga: &'v hir::GenericArg<'v>) { + record_variants!( + (self, ga, ga, Id::Node(ga.hir_id()), hir, GenericArg, GenericArg), + [Lifetime, Type, Const, Infer] + ); + match ga { + hir::GenericArg::Lifetime(lt) => self.visit_lifetime(lt), + hir::GenericArg::Type(ty) => self.visit_ty(ty), + hir::GenericArg::Const(ct) => self.visit_anon_const(&ct.value), + hir::GenericArg::Infer(inf) => self.visit_infer(inf), + } } fn visit_lifetime(&mut self, lifetime: &'v hir::Lifetime) { @@ -218,19 +442,19 @@ impl<'v> hir_visit::Visitor<'v> for StatCollector<'v> { hir_visit::walk_lifetime(self, lifetime) } - fn visit_qpath(&mut self, qpath: &'v hir::QPath<'v>, id: hir::HirId, span: Span) { - self.record("QPath", Id::None, qpath); - hir_visit::walk_qpath(self, qpath, id, span) - } - fn visit_path(&mut self, path: &'v hir::Path<'v>, _id: hir::HirId) { self.record("Path", Id::None, path); hir_visit::walk_path(self, path) } - fn visit_path_segment(&mut self, path_span: Span, path_segment: &'v hir::PathSegment<'v>) { + fn visit_path_segment(&mut self, path_segment: &'v hir::PathSegment<'v>) { self.record("PathSegment", Id::None, path_segment); - hir_visit::walk_path_segment(self, path_span, path_segment) + hir_visit::walk_path_segment(self, path_segment) + } + + fn visit_generic_args(&mut self, ga: &'v hir::GenericArgs<'v>) { + self.record("GenericArgs", Id::None, ga); + hir_visit::walk_generic_args(self, ga) } fn visit_assoc_type_binding(&mut self, type_binding: &'v hir::TypeBinding<'v>) { @@ -241,16 +465,45 @@ impl<'v> hir_visit::Visitor<'v> for StatCollector<'v> { fn visit_attribute(&mut self, attr: &'v ast::Attribute) { self.record("Attribute", Id::Attr(attr.id), attr); } + + fn visit_inline_asm(&mut self, asm: &'v hir::InlineAsm<'v>, id: HirId) { + self.record("InlineAsm", Id::None, asm); + hir_visit::walk_inline_asm(self, asm, id); + } } impl<'v> ast_visit::Visitor<'v> for StatCollector<'v> { fn visit_foreign_item(&mut self, i: &'v ast::ForeignItem) { - self.record("ForeignItem", Id::None, i); + record_variants!( + (self, i, i.kind, Id::None, ast, ForeignItem, ForeignItemKind), + [Static, Fn, TyAlias, MacCall] + ); ast_visit::walk_foreign_item(self, i) } fn visit_item(&mut self, i: &'v ast::Item) { - self.record("Item", Id::None, i); + record_variants!( + (self, i, i.kind, Id::None, ast, Item, ItemKind), + [ + ExternCrate, + Use, + Static, + Const, + Fn, + Mod, + ForeignMod, + GlobalAsm, + TyAlias, + Enum, + Struct, + Union, + Trait, + TraitAlias, + Impl, + MacCall, + MacroDef + ] + ); ast_visit::walk_item(self, i) } @@ -265,47 +518,119 @@ impl<'v> ast_visit::Visitor<'v> for StatCollector<'v> { } fn visit_stmt(&mut self, s: &'v ast::Stmt) { - self.record("Stmt", Id::None, s); + record_variants!( + (self, s, s.kind, Id::None, ast, Stmt, StmtKind), + [Local, Item, Expr, Semi, Empty, MacCall] + ); ast_visit::walk_stmt(self, s) } + fn visit_param(&mut self, p: &'v ast::Param) { + self.record("Param", Id::None, p); + ast_visit::walk_param(self, p) + } + fn visit_arm(&mut self, a: &'v ast::Arm) { self.record("Arm", Id::None, a); ast_visit::walk_arm(self, a) } fn visit_pat(&mut self, p: &'v ast::Pat) { - self.record("Pat", Id::None, p); + record_variants!( + (self, p, p.kind, Id::None, ast, Pat, PatKind), + [ + Wild, + Ident, + Struct, + TupleStruct, + Or, + Path, + Tuple, + Box, + Ref, + Lit, + Range, + Slice, + Rest, + Paren, + MacCall + ] + ); ast_visit::walk_pat(self, p) } - fn visit_expr(&mut self, ex: &'v ast::Expr) { - self.record("Expr", Id::None, ex); - ast_visit::walk_expr(self, ex) + fn visit_expr(&mut self, e: &'v ast::Expr) { + record_variants!( + (self, e, e.kind, Id::None, ast, Expr, ExprKind), + [ + Box, Array, ConstBlock, Call, MethodCall, Tup, Binary, Unary, Lit, Cast, Type, Let, + If, While, ForLoop, Loop, Match, Closure, Block, Async, Await, TryBlock, Assign, + AssignOp, Field, Index, Range, Underscore, Path, AddrOf, Break, Continue, Ret, + InlineAsm, MacCall, Struct, Repeat, Paren, Try, Yield, Yeet, Err + ] + ); + ast_visit::walk_expr(self, e) } fn visit_ty(&mut self, t: &'v ast::Ty) { - self.record("Ty", Id::None, t); + record_variants!( + (self, t, t.kind, Id::None, ast, Ty, TyKind), + [ + Slice, + Array, + Ptr, + Rptr, + BareFn, + Never, + Tup, + Path, + TraitObject, + ImplTrait, + Paren, + Typeof, + Infer, + ImplicitSelf, + MacCall, + Err, + CVarArgs + ] + ); + ast_visit::walk_ty(self, t) } - fn visit_fn(&mut self, fk: ast_visit::FnKind<'v>, s: Span, _: NodeId) { + fn visit_generic_param(&mut self, g: &'v ast::GenericParam) { + self.record("GenericParam", Id::None, g); + ast_visit::walk_generic_param(self, g) + } + + fn visit_where_predicate(&mut self, p: &'v ast::WherePredicate) { + record_variants!( + (self, p, p, Id::None, ast, WherePredicate, WherePredicate), + [BoundPredicate, RegionPredicate, EqPredicate] + ); + ast_visit::walk_where_predicate(self, p) + } + + fn visit_fn(&mut self, fk: ast_visit::FnKind<'v>, _: Span, _: NodeId) { self.record("FnDecl", Id::None, fk.decl()); - ast_visit::walk_fn(self, fk, s) + ast_visit::walk_fn(self, fk) } - fn visit_assoc_item(&mut self, item: &'v ast::AssocItem, ctxt: ast_visit::AssocCtxt) { - let label = match ctxt { - ast_visit::AssocCtxt::Trait => "TraitItem", - ast_visit::AssocCtxt::Impl => "ImplItem", - }; - self.record(label, Id::None, item); - ast_visit::walk_assoc_item(self, item, ctxt); + fn visit_assoc_item(&mut self, i: &'v ast::AssocItem, ctxt: ast_visit::AssocCtxt) { + record_variants!( + (self, i, i.kind, Id::None, ast, AssocItem, AssocItemKind), + [Const, Fn, TyAlias, MacCall] + ); + ast_visit::walk_assoc_item(self, i, ctxt); } - fn visit_param_bound(&mut self, bounds: &'v ast::GenericBound, _ctxt: BoundKind) { - self.record("GenericBound", Id::None, bounds); - ast_visit::walk_param_bound(self, bounds) + fn visit_param_bound(&mut self, b: &'v ast::GenericBound, _ctxt: BoundKind) { + record_variants!( + (self, b, b, Id::None, ast, GenericBound, GenericBound), + [Trait, Outlives] + ); + ast_visit::walk_param_bound(self, b) } fn visit_field_def(&mut self, s: &'v ast::FieldDef) { @@ -318,27 +643,52 @@ impl<'v> ast_visit::Visitor<'v> for StatCollector<'v> { ast_visit::walk_variant(self, v) } - fn visit_lifetime(&mut self, lifetime: &'v ast::Lifetime, _: ast_visit::LifetimeCtxt) { - self.record("Lifetime", Id::None, lifetime); - ast_visit::walk_lifetime(self, lifetime) + // `UseTree` has one inline use (in `ast::ItemKind::Use`) and one + // non-inline use (in `ast::UseTreeKind::Nested). The former case is more + // common, so we don't implement `visit_use_tree` and tolerate the missed + // coverage in the latter case. + + // `PathSegment` has one inline use (in `ast::ExprKind::MethodCall`) and + // one non-inline use (in `ast::Path::segments`). The latter case is more + // common than the former case, so we implement this visitor and tolerate + // the double counting in the former case. + fn visit_path_segment(&mut self, path_segment: &'v ast::PathSegment) { + self.record("PathSegment", Id::None, path_segment); + ast_visit::walk_path_segment(self, path_segment) } - fn visit_mac_call(&mut self, mac: &'v ast::MacCall) { - self.record("MacCall", Id::None, mac); - ast_visit::walk_mac(self, mac) + // `GenericArgs` has one inline use (in `ast::AssocConstraint::gen_args`) and one + // non-inline use (in `ast::PathSegment::args`). The latter case is more + // common, so we implement `visit_generic_args` and tolerate the double + // counting in the former case. + fn visit_generic_args(&mut self, g: &'v ast::GenericArgs) { + record_variants!( + (self, g, g, Id::None, ast, GenericArgs, GenericArgs), + [AngleBracketed, Parenthesized] + ); + ast_visit::walk_generic_args(self, g) } - fn visit_path_segment(&mut self, path_span: Span, path_segment: &'v ast::PathSegment) { - self.record("PathSegment", Id::None, path_segment); - ast_visit::walk_path_segment(self, path_span, path_segment) + fn visit_attribute(&mut self, attr: &'v ast::Attribute) { + record_variants!( + (self, attr, attr.kind, Id::None, ast, Attribute, AttrKind), + [Normal, DocComment] + ); + ast_visit::walk_attribute(self, attr) } - fn visit_assoc_constraint(&mut self, constraint: &'v ast::AssocConstraint) { - self.record("AssocConstraint", Id::None, constraint); - ast_visit::walk_assoc_constraint(self, constraint) + fn visit_expr_field(&mut self, f: &'v ast::ExprField) { + self.record("ExprField", Id::None, f); + ast_visit::walk_expr_field(self, f) } - fn visit_attribute(&mut self, attr: &'v ast::Attribute) { - self.record("Attribute", Id::None, attr); + fn visit_crate(&mut self, krate: &'v ast::Crate) { + self.record("Crate", Id::None, krate); + ast_visit::walk_crate(self, krate) + } + + fn visit_inline_asm(&mut self, asm: &'v ast::InlineAsm) { + self.record("InlineAsm", Id::None, asm); + ast_visit::walk_inline_asm(self, asm) } } diff --git a/compiler/rustc_passes/src/lib.rs b/compiler/rustc_passes/src/lib.rs index 7b2f83958..39ebb8db2 100644 --- a/compiler/rustc_passes/src/lib.rs +++ b/compiler/rustc_passes/src/lib.rs @@ -8,7 +8,7 @@ #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")] #![feature(iter_intersperse)] #![feature(let_chains)] -#![feature(let_else)] +#![cfg_attr(bootstrap, feature(let_else))] #![feature(map_try_insert)] #![feature(min_specialization)] #![feature(try_blocks)] diff --git a/compiler/rustc_passes/src/lib_features.rs b/compiler/rustc_passes/src/lib_features.rs index e05994f13..04173c792 100644 --- a/compiler/rustc_passes/src/lib_features.rs +++ b/compiler/rustc_passes/src/lib_features.rs @@ -5,6 +5,7 @@ //! collect them instead. use rustc_ast::{Attribute, MetaItemKind}; +use rustc_attr::{rust_version_symbol, VERSION_PLACEHOLDER}; use rustc_errors::struct_span_err; use rustc_hir::intravisit::Visitor; use rustc_middle::hir::nested_filter; @@ -29,11 +30,16 @@ impl<'tcx> LibFeatureCollector<'tcx> { } fn extract(&self, attr: &Attribute) -> Option<(Symbol, Option<Symbol>, Span)> { - let stab_attrs = - [sym::stable, sym::unstable, sym::rustc_const_stable, sym::rustc_const_unstable]; + let stab_attrs = [ + sym::stable, + sym::unstable, + sym::rustc_const_stable, + sym::rustc_const_unstable, + sym::rustc_default_body_unstable, + ]; // Find a stability attribute: one of #[stable(…)], #[unstable(…)], - // #[rustc_const_stable(…)], or #[rustc_const_unstable(…)]. + // #[rustc_const_stable(…)], #[rustc_const_unstable(…)] or #[rustc_default_body_unstable]. if let Some(stab_attr) = stab_attrs.iter().find(|stab_attr| attr.has_name(**stab_attr)) { let meta_kind = attr.meta_kind(); if let Some(MetaItemKind::List(ref metas)) = meta_kind { @@ -49,12 +55,21 @@ impl<'tcx> LibFeatureCollector<'tcx> { } } } + + if let Some(s) = since && s.as_str() == VERSION_PLACEHOLDER { + since = Some(rust_version_symbol()); + } + if let Some(feature) = feature { // This additional check for stability is to make sure we // don't emit additional, irrelevant errors for malformed // attributes. - let is_unstable = - matches!(*stab_attr, sym::unstable | sym::rustc_const_unstable); + let is_unstable = matches!( + *stab_attr, + sym::unstable + | sym::rustc_const_unstable + | sym::rustc_default_body_unstable + ); if since.is_some() || is_unstable { return Some((feature, since, attr.span)); } diff --git a/compiler/rustc_passes/src/liveness.rs b/compiler/rustc_passes/src/liveness.rs index 461dd52b9..6a4cd79cd 100644 --- a/compiler/rustc_passes/src/liveness.rs +++ b/compiler/rustc_passes/src/liveness.rs @@ -89,16 +89,15 @@ use rustc_data_structures::fx::FxIndexMap; use rustc_errors::Applicability; use rustc_hir as hir; use rustc_hir::def::*; -use rustc_hir::def_id::LocalDefId; +use rustc_hir::def_id::{DefId, LocalDefId}; use rustc_hir::intravisit::{self, Visitor}; use rustc_hir::{Expr, HirId, HirIdMap, HirIdSet}; use rustc_index::vec::IndexVec; -use rustc_middle::hir::nested_filter; use rustc_middle::ty::query::Providers; use rustc_middle::ty::{self, DefIdTree, RootVariableMinCaptureList, Ty, TyCtxt}; use rustc_session::lint; use rustc_span::symbol::{kw, sym, Symbol}; -use rustc_span::Span; +use rustc_span::{BytePos, Span}; use std::collections::VecDeque; use std::io; @@ -139,12 +138,54 @@ fn live_node_kind_to_string(lnk: LiveNodeKind, tcx: TyCtxt<'_>) -> String { } } -fn check_mod_liveness(tcx: TyCtxt<'_>, module_def_id: LocalDefId) { - tcx.hir().visit_item_likes_in_module(module_def_id, &mut IrMaps::new(tcx)); +fn check_liveness(tcx: TyCtxt<'_>, def_id: DefId) { + let local_def_id = match def_id.as_local() { + None => return, + Some(def_id) => def_id, + }; + + // Don't run unused pass for #[derive()] + let parent = tcx.local_parent(local_def_id); + if let DefKind::Impl = tcx.def_kind(parent) + && tcx.has_attr(parent.to_def_id(), sym::automatically_derived) + { + return; + } + + // Don't run unused pass for #[naked] + if tcx.has_attr(def_id, sym::naked) { + return; + } + + let mut maps = IrMaps::new(tcx); + let body_id = tcx.hir().body_owned_by(local_def_id); + let hir_id = tcx.hir().body_owner(body_id); + let body = tcx.hir().body(body_id); + + if let Some(upvars) = tcx.upvars_mentioned(def_id) { + for &var_hir_id in upvars.keys() { + let var_name = tcx.hir().name(var_hir_id); + maps.add_variable(Upvar(var_hir_id, var_name)); + } + } + + // gather up the various local variables, significant expressions, + // and so forth: + maps.visit_body(body); + + // compute liveness + let mut lsets = Liveness::new(&mut maps, local_def_id); + let entry_ln = lsets.compute(&body, hir_id); + lsets.log_liveness(entry_ln, body_id.hir_id); + + // check for various error conditions + lsets.visit_body(body); + lsets.warn_about_unused_upvars(entry_ln); + lsets.warn_about_unused_args(body, entry_ln); } pub fn provide(providers: &mut Providers) { - *providers = Providers { check_mod_liveness, ..*providers }; + *providers = Providers { check_liveness, ..*providers }; } // ______________________________________________________________________ @@ -188,6 +229,19 @@ enum VarKind { Upvar(HirId, Symbol), } +struct CollectLitsVisitor<'tcx> { + lit_exprs: Vec<&'tcx hir::Expr<'tcx>>, +} + +impl<'tcx> Visitor<'tcx> for CollectLitsVisitor<'tcx> { + fn visit_expr(&mut self, expr: &'tcx Expr<'tcx>) { + if let hir::ExprKind::Lit(_) = expr.kind { + self.lit_exprs.push(expr); + } + intravisit::walk_expr(self, expr); + } +} + struct IrMaps<'tcx> { tcx: TyCtxt<'tcx>, live_node_map: HirIdMap<LiveNode>, @@ -316,56 +370,6 @@ impl<'tcx> IrMaps<'tcx> { } impl<'tcx> Visitor<'tcx> for IrMaps<'tcx> { - type NestedFilter = nested_filter::OnlyBodies; - - fn nested_visit_map(&mut self) -> Self::Map { - self.tcx.hir() - } - - fn visit_body(&mut self, body: &'tcx hir::Body<'tcx>) { - debug!("visit_body {:?}", body.id()); - - // swap in a new set of IR maps for this body - let mut maps = IrMaps::new(self.tcx); - let hir_id = maps.tcx.hir().body_owner(body.id()); - let local_def_id = maps.tcx.hir().local_def_id(hir_id); - let def_id = local_def_id.to_def_id(); - - // Don't run unused pass for #[derive()] - let parent = self.tcx.local_parent(local_def_id); - if let DefKind::Impl = self.tcx.def_kind(parent) - && self.tcx.has_attr(parent.to_def_id(), sym::automatically_derived) - { - return; - } - - // Don't run unused pass for #[naked] - if self.tcx.has_attr(def_id, sym::naked) { - return; - } - - if let Some(upvars) = maps.tcx.upvars_mentioned(def_id) { - for &var_hir_id in upvars.keys() { - let var_name = maps.tcx.hir().name(var_hir_id); - maps.add_variable(Upvar(var_hir_id, var_name)); - } - } - - // gather up the various local variables, significant expressions, - // and so forth: - intravisit::walk_body(&mut maps, body); - - // compute liveness - let mut lsets = Liveness::new(&mut maps, local_def_id); - let entry_ln = lsets.compute(&body, hir_id); - lsets.log_liveness(entry_ln, body.id().hir_id); - - // check for various error conditions - lsets.visit_body(body); - lsets.warn_about_unused_upvars(entry_ln); - lsets.warn_about_unused_args(body, entry_ln); - } - fn visit_local(&mut self, local: &'tcx hir::Local<'tcx>) { self.add_from_pat(&local.pat); if local.els.is_some() { @@ -1035,9 +1039,10 @@ impl<'a, 'tcx> Liveness<'a, 'tcx> { self.propagate_through_expr(&f, succ) } - hir::ExprKind::MethodCall(.., ref args, _) => { + hir::ExprKind::MethodCall(.., receiver, ref args, _) => { let succ = self.check_is_ty_uninhabited(expr, succ); - self.propagate_through_exprs(args, succ) + let succ = self.propagate_through_exprs(args, succ); + self.propagate_through_expr(receiver, succ) } hir::ExprKind::Tup(ref exprs) => self.propagate_through_exprs(exprs, succ), @@ -1342,7 +1347,7 @@ impl<'a, 'tcx> Liveness<'a, 'tcx> { impl<'a, 'tcx> Visitor<'tcx> for Liveness<'a, 'tcx> { fn visit_local(&mut self, local: &'tcx hir::Local<'tcx>) { - self.check_unused_vars_in_pat(&local.pat, None, |spans, hir_id, ln, var| { + self.check_unused_vars_in_pat(&local.pat, None, None, |spans, hir_id, ln, var| { if local.init.is_some() { self.warn_about_dead_assign(spans, hir_id, ln, var); } @@ -1357,7 +1362,7 @@ impl<'a, 'tcx> Visitor<'tcx> for Liveness<'a, 'tcx> { } fn visit_arm(&mut self, arm: &'tcx hir::Arm<'tcx>) { - self.check_unused_vars_in_pat(&arm.pat, None, |_, _, _, _| {}); + self.check_unused_vars_in_pat(&arm.pat, None, None, |_, _, _, _| {}); intravisit::walk_arm(self, arm); } } @@ -1396,7 +1401,7 @@ fn check_expr<'tcx>(this: &mut Liveness<'_, 'tcx>, expr: &'tcx Expr<'tcx>) { } hir::ExprKind::Let(let_expr) => { - this.check_unused_vars_in_pat(let_expr.pat, None, |_, _, _, _| {}); + this.check_unused_vars_in_pat(let_expr.pat, None, None, |_, _, _, _| {}); } // no correctness conditions related to liveness @@ -1517,13 +1522,18 @@ impl<'tcx> Liveness<'_, 'tcx> { fn warn_about_unused_args(&self, body: &hir::Body<'_>, entry_ln: LiveNode) { for p in body.params { - self.check_unused_vars_in_pat(&p.pat, Some(entry_ln), |spans, hir_id, ln, var| { - if !self.live_on_entry(ln, var) { - self.report_unused_assign(hir_id, spans, var, |name| { - format!("value passed to `{}` is never read", name) - }); - } - }); + self.check_unused_vars_in_pat( + &p.pat, + Some(entry_ln), + Some(body), + |spans, hir_id, ln, var| { + if !self.live_on_entry(ln, var) { + self.report_unused_assign(hir_id, spans, var, |name| { + format!("value passed to `{}` is never read", name) + }); + } + }, + ); } } @@ -1531,6 +1541,7 @@ impl<'tcx> Liveness<'_, 'tcx> { &self, pat: &hir::Pat<'_>, entry_ln: Option<LiveNode>, + opt_body: Option<&hir::Body<'_>>, on_used_on_entry: impl Fn(Vec<Span>, HirId, LiveNode, Variable), ) { // In an or-pattern, only consider the variable; any later patterns must have the same @@ -1549,6 +1560,8 @@ impl<'tcx> Liveness<'_, 'tcx> { .or_insert_with(|| (ln, var, vec![id_and_sp])); }); + let can_remove = matches!(&pat.kind, hir::PatKind::Struct(_, _, true)); + for (_, (ln, var, hir_ids_and_spans)) in vars { if self.used_on_entry(ln, var) { let id = hir_ids_and_spans[0].0; @@ -1556,16 +1569,20 @@ impl<'tcx> Liveness<'_, 'tcx> { hir_ids_and_spans.into_iter().map(|(_, _, ident_span)| ident_span).collect(); on_used_on_entry(spans, id, ln, var); } else { - self.report_unused(hir_ids_and_spans, ln, var); + self.report_unused(hir_ids_and_spans, ln, var, can_remove, pat, opt_body); } } } + #[instrument(skip(self), level = "INFO")] fn report_unused( &self, hir_ids_and_spans: Vec<(HirId, Span, Span)>, ln: LiveNode, var: Variable, + can_remove: bool, + pat: &hir::Pat<'_>, + opt_body: Option<&hir::Body<'_>>, ) { let first_hir_id = hir_ids_and_spans[0].0; @@ -1590,6 +1607,32 @@ impl<'tcx> Liveness<'_, 'tcx> { .emit(); }, ) + } else if can_remove { + self.ir.tcx.struct_span_lint_hir( + lint::builtin::UNUSED_VARIABLES, + first_hir_id, + hir_ids_and_spans.iter().map(|(_, pat_span, _)| *pat_span).collect::<Vec<_>>(), + |lint| { + let mut err = lint.build(&format!("unused variable: `{}`", name)); + err.multipart_suggestion( + "try removing the field", + hir_ids_and_spans + .iter() + .map(|(_, pat_span, _)| { + let span = self + .ir + .tcx + .sess + .source_map() + .span_extend_to_next_char(*pat_span, ',', true); + (span.with_hi(BytePos(span.hi().0 + 1)), String::new()) + }) + .collect(), + Applicability::MachineApplicable, + ); + err.emit(); + }, + ); } else { let (shorthands, non_shorthands): (Vec<_>, Vec<_>) = hir_ids_and_spans.iter().copied().partition(|(hir_id, _, ident_span)| { @@ -1643,6 +1686,9 @@ impl<'tcx> Liveness<'_, 'tcx> { .collect::<Vec<_>>(), |lint| { let mut err = lint.build(&format!("unused variable: `{}`", name)); + if self.has_added_lit_match_name_span(&name, opt_body, &mut err) { + err.span_label(pat.span, "unused variable"); + } err.multipart_suggestion( "if this is intentional, prefix it with an underscore", non_shorthands, @@ -1656,6 +1702,42 @@ impl<'tcx> Liveness<'_, 'tcx> { } } + fn has_added_lit_match_name_span( + &self, + name: &str, + opt_body: Option<&hir::Body<'_>>, + err: &mut rustc_errors::DiagnosticBuilder<'_, ()>, + ) -> bool { + let mut has_litstring = false; + let Some(opt_body) = opt_body else {return false;}; + let mut visitor = CollectLitsVisitor { lit_exprs: vec![] }; + intravisit::walk_body(&mut visitor, opt_body); + for lit_expr in visitor.lit_exprs { + let hir::ExprKind::Lit(litx) = &lit_expr.kind else { continue }; + let rustc_ast::LitKind::Str(syb, _) = litx.node else{ continue; }; + let name_str: &str = syb.as_str(); + let mut name_pa = String::from("{"); + name_pa.push_str(&name); + name_pa.push('}'); + if name_str.contains(&name_pa) { + err.span_label( + lit_expr.span, + "you might have meant to use string interpolation in this string literal", + ); + err.multipart_suggestion( + "string interpolation only works in `format!` invocations", + vec![ + (lit_expr.span.shrink_to_lo(), "format!(".to_string()), + (lit_expr.span.shrink_to_hi(), ")".to_string()), + ], + Applicability::MachineApplicable, + ); + has_litstring = true; + } + } + has_litstring + } + fn warn_about_dead_assign(&self, spans: Vec<Span>, hir_id: HirId, ln: LiveNode, var: Variable) { if !self.live_on_exit(ln, var) { self.report_unused_assign(hir_id, spans, var, |name| { diff --git a/compiler/rustc_passes/src/naked_functions.rs b/compiler/rustc_passes/src/naked_functions.rs index 20765abf3..607973446 100644 --- a/compiler/rustc_passes/src/naked_functions.rs +++ b/compiler/rustc_passes/src/naked_functions.rs @@ -1,11 +1,12 @@ //! Checks validity of naked functions. -use rustc_ast::{Attribute, InlineAsmOptions}; +use rustc_ast::InlineAsmOptions; use rustc_errors::{struct_span_err, Applicability}; use rustc_hir as hir; +use rustc_hir::def::DefKind; use rustc_hir::def_id::LocalDefId; -use rustc_hir::intravisit::{FnKind, Visitor}; -use rustc_hir::{ExprKind, HirId, InlineAsmOperand, StmtKind}; +use rustc_hir::intravisit::Visitor; +use rustc_hir::{ExprKind, InlineAsmOperand, StmtKind}; use rustc_middle::ty::query::Providers; use rustc_middle::ty::TyCtxt; use rustc_session::lint::builtin::UNDEFINED_NAKED_FUNCTION_ABI; @@ -13,71 +14,58 @@ use rustc_span::symbol::sym; use rustc_span::Span; use rustc_target::spec::abi::Abi; -fn check_mod_naked_functions(tcx: TyCtxt<'_>, module_def_id: LocalDefId) { - tcx.hir().visit_item_likes_in_module(module_def_id, &mut CheckNakedFunctions { tcx }); -} - pub(crate) fn provide(providers: &mut Providers) { *providers = Providers { check_mod_naked_functions, ..*providers }; } -struct CheckNakedFunctions<'tcx> { - tcx: TyCtxt<'tcx>, -} - -impl<'tcx> Visitor<'tcx> for CheckNakedFunctions<'tcx> { - fn visit_fn( - &mut self, - fk: FnKind<'_>, - _fd: &'tcx hir::FnDecl<'tcx>, - body_id: hir::BodyId, - span: Span, - hir_id: HirId, - ) { - let ident_span; - let fn_header; - - match fk { - FnKind::Closure => { - // Closures with a naked attribute are rejected during attribute - // check. Don't validate them any further. - return; - } - FnKind::ItemFn(ident, _, ref header, ..) => { - ident_span = ident.span; - fn_header = header; - } - - FnKind::Method(ident, ref sig, ..) => { - ident_span = ident.span; - fn_header = &sig.header; - } +fn check_mod_naked_functions(tcx: TyCtxt<'_>, module_def_id: LocalDefId) { + let items = tcx.hir_module_items(module_def_id); + for def_id in items.definitions() { + if !matches!(tcx.def_kind(def_id), DefKind::Fn | DefKind::AssocFn) { + continue; } - let attrs = self.tcx.hir().attrs(hir_id); - let naked = attrs.iter().any(|attr| attr.has_name(sym::naked)); - if naked { - let body = self.tcx.hir().body(body_id); - check_abi(self.tcx, hir_id, fn_header.abi, ident_span); - check_no_patterns(self.tcx, body.params); - check_no_parameters_use(self.tcx, body); - check_asm(self.tcx, body, span); - check_inline(self.tcx, attrs); + let naked = tcx.has_attr(def_id.to_def_id(), sym::naked); + if !naked { + continue; } + + let (fn_header, body_id) = match tcx.hir().get_by_def_id(def_id) { + hir::Node::Item(hir::Item { kind: hir::ItemKind::Fn(sig, _, body_id), .. }) + | hir::Node::TraitItem(hir::TraitItem { + kind: hir::TraitItemKind::Fn(sig, hir::TraitFn::Provided(body_id)), + .. + }) + | hir::Node::ImplItem(hir::ImplItem { + kind: hir::ImplItemKind::Fn(sig, body_id), + .. + }) => (sig.header, *body_id), + _ => continue, + }; + + let body = tcx.hir().body(body_id); + check_abi(tcx, def_id, fn_header.abi); + check_no_patterns(tcx, body.params); + check_no_parameters_use(tcx, body); + check_asm(tcx, def_id, body); + check_inline(tcx, def_id); } } /// Check that the function isn't inlined. -fn check_inline(tcx: TyCtxt<'_>, attrs: &[Attribute]) { - for attr in attrs.iter().filter(|attr| attr.has_name(sym::inline)) { +fn check_inline(tcx: TyCtxt<'_>, def_id: LocalDefId) { + let attrs = tcx.get_attrs(def_id.to_def_id(), sym::inline); + for attr in attrs { tcx.sess.struct_span_err(attr.span, "naked functions cannot be inlined").emit(); } } /// Checks that function uses non-Rust ABI. -fn check_abi(tcx: TyCtxt<'_>, hir_id: HirId, abi: Abi, fn_ident_span: Span) { +fn check_abi(tcx: TyCtxt<'_>, def_id: LocalDefId, abi: Abi) { if abi == Abi::Rust { - tcx.struct_span_lint_hir(UNDEFINED_NAKED_FUNCTION_ABI, hir_id, fn_ident_span, |lint| { + let hir_id = tcx.hir().local_def_id_to_hir_id(def_id); + let span = tcx.def_span(def_id); + tcx.struct_span_lint_hir(UNDEFINED_NAKED_FUNCTION_ABI, hir_id, span, |lint| { lint.build("Rust ABI is unsupported in naked functions").emit(); }); } @@ -88,7 +76,7 @@ fn check_no_patterns(tcx: TyCtxt<'_>, params: &[hir::Param<'_>]) { for param in params { match param.pat.kind { hir::PatKind::Wild - | hir::PatKind::Binding(hir::BindingAnnotation::Unannotated, _, _, None) => {} + | hir::PatKind::Binding(hir::BindingAnnotation::NONE, _, _, None) => {} _ => { tcx.sess .struct_span_err( @@ -141,7 +129,7 @@ impl<'tcx> Visitor<'tcx> for CheckParameters<'tcx> { } /// Checks that function body contains a single inline assembly block. -fn check_asm<'tcx>(tcx: TyCtxt<'tcx>, body: &'tcx hir::Body<'tcx>, fn_span: Span) { +fn check_asm<'tcx>(tcx: TyCtxt<'tcx>, def_id: LocalDefId, body: &'tcx hir::Body<'tcx>) { let mut this = CheckInlineAssembly { tcx, items: Vec::new() }; this.visit_body(body); if let [(ItemKind::Asm | ItemKind::Err, _)] = this.items[..] { @@ -149,7 +137,7 @@ fn check_asm<'tcx>(tcx: TyCtxt<'tcx>, body: &'tcx hir::Body<'tcx>, fn_span: Span } else { let mut diag = struct_span_err!( tcx.sess, - fn_span, + tcx.def_span(def_id), E0787, "naked functions must contain a single asm block" ); diff --git a/compiler/rustc_passes/src/stability.rs b/compiler/rustc_passes/src/stability.rs index ca6a2ac3d..9ba127609 100644 --- a/compiler/rustc_passes/src/stability.rs +++ b/compiler/rustc_passes/src/stability.rs @@ -1,8 +1,10 @@ //! A pass that annotates every item and method with its stability level, //! propagating default levels lexically from parent to children ast nodes. -use attr::StabilityLevel; -use rustc_attr::{self as attr, ConstStability, Stability, Unstable, UnstableReason}; +use rustc_attr::{ + self as attr, rust_version_symbol, ConstStability, Stability, StabilityLevel, Unstable, + UnstableReason, VERSION_PLACEHOLDER, +}; use rustc_data_structures::fx::{FxHashMap, FxHashSet, FxIndexMap}; use rustc_errors::{struct_span_err, Applicability}; use rustc_hir as hir; @@ -10,7 +12,7 @@ use rustc_hir::def::{DefKind, Res}; use rustc_hir::def_id::{LocalDefId, CRATE_DEF_ID}; use rustc_hir::hir_id::CRATE_HIR_ID; use rustc_hir::intravisit::{self, Visitor}; -use rustc_hir::{FieldDef, Generics, HirId, Item, ItemKind, TraitRef, Ty, TyKind, Variant}; +use rustc_hir::{FieldDef, Item, ItemKind, TraitRef, Ty, TyKind, Variant}; use rustc_middle::hir::nested_filter; use rustc_middle::middle::privacy::AccessLevels; use rustc_middle::middle::stability::{AllowUnstable, DeprecationEntry, Index}; @@ -161,7 +163,7 @@ impl<'a, 'tcx> Annotator<'a, 'tcx> { return; } - let (stab, const_stab) = attr::find_stability(&self.tcx.sess, attrs, item_sp); + let (stab, const_stab, body_stab) = attr::find_stability(&self.tcx.sess, attrs, item_sp); let mut const_span = None; let const_stab = const_stab.map(|(const_stab, const_span_node)| { @@ -209,6 +211,13 @@ impl<'a, 'tcx> Annotator<'a, 'tcx> { } } + if let Some((body_stab, _span)) = body_stab { + // FIXME: check that this item can have body stability + + self.index.default_body_stab_map.insert(def_id, body_stab); + debug!(?self.index.default_body_stab_map); + } + let stab = stab.map(|(stab, span)| { // Error if prohibited, or can't inherit anything from a container. if kind == AnnotationKind::Prohibited @@ -434,7 +443,7 @@ impl<'a, 'tcx> Visitor<'tcx> for Annotator<'a, 'tcx> { ); } - fn visit_variant(&mut self, var: &'tcx Variant<'tcx>, g: &'tcx Generics<'tcx>, item_id: HirId) { + fn visit_variant(&mut self, var: &'tcx Variant<'tcx>) { self.annotate( self.tcx.hir().local_def_id(var.id), var.span, @@ -452,12 +461,12 @@ impl<'a, 'tcx> Visitor<'tcx> for Annotator<'a, 'tcx> { AnnotationKind::Required, InheritDeprecation::Yes, InheritConstStability::No, - InheritStability::No, + InheritStability::Yes, |_| {}, ); } - intravisit::walk_variant(v, var, g, item_id) + intravisit::walk_variant(v, var) }, ) } @@ -590,9 +599,12 @@ impl<'tcx> Visitor<'tcx> for MissingStabilityAnnotations<'tcx> { intravisit::walk_impl_item(self, ii); } - fn visit_variant(&mut self, var: &'tcx Variant<'tcx>, g: &'tcx Generics<'tcx>, item_id: HirId) { + fn visit_variant(&mut self, var: &'tcx Variant<'tcx>) { self.check_missing_stability(self.tcx.hir().local_def_id(var.id), var.span); - intravisit::walk_variant(self, var, g, item_id); + if let Some(ctor_hir_id) = var.data.ctor_hir_id() { + self.check_missing_stability(self.tcx.hir().local_def_id(ctor_hir_id), var.span); + } + intravisit::walk_variant(self, var); } fn visit_field_def(&mut self, s: &'tcx FieldDef<'tcx>) { @@ -613,6 +625,7 @@ fn stability_index(tcx: TyCtxt<'_>, (): ()) -> Index { let mut index = Index { stab_map: Default::default(), const_stab_map: Default::default(), + default_body_stab_map: Default::default(), depr_map: Default::default(), implications: Default::default(), }; @@ -673,6 +686,9 @@ pub(crate) fn provide(providers: &mut Providers) { stability_implications: |tcx, _| tcx.stability().implications.clone(), lookup_stability: |tcx, id| tcx.stability().local_stability(id.expect_local()), lookup_const_stability: |tcx, id| tcx.stability().local_const_stability(id.expect_local()), + lookup_default_body_stability: |tcx, id| { + tcx.stability().local_default_body_stability(id.expect_local()) + }, lookup_deprecation_entry: |tcx, id| { tcx.stability().local_deprecation_entry(id.expect_local()) }, @@ -723,7 +739,8 @@ impl<'tcx> Visitor<'tcx> for Checker<'tcx> { let features = self.tcx.features(); if features.staged_api { let attrs = self.tcx.hir().attrs(item.hir_id()); - let (stab, const_stab) = attr::find_stability(&self.tcx.sess, attrs, item.span); + let (stab, const_stab, _) = + attr::find_stability(&self.tcx.sess, attrs, item.span); // If this impl block has an #[unstable] attribute, give an // error if all involved types and traits are stable, because @@ -816,7 +833,7 @@ impl<'tcx> Visitor<'tcx> for Checker<'tcx> { // added, such as `core::intrinsics::transmute` let parents = path.segments.iter().rev().skip(1); for path_segment in parents { - if let Some(def_id) = path_segment.res.as_ref().and_then(Res::opt_def_id) { + if let Some(def_id) = path_segment.res.opt_def_id() { // use `None` for id to prevent deprecation check self.tcx.check_stability_allow_unstable( def_id, @@ -949,51 +966,90 @@ pub fn check_unused_or_stable_features(tcx: TyCtxt<'_>) { remaining_lib_features.remove(&sym::libc); remaining_lib_features.remove(&sym::test); - // We always collect the lib features declared in the current crate, even if there are - // no unknown features, because the collection also does feature attribute validation. - let local_defined_features = tcx.lib_features(()); - let mut all_lib_features: FxHashMap<_, _> = - local_defined_features.to_vec().iter().map(|el| *el).collect(); - let mut implications = tcx.stability_implications(rustc_hir::def_id::LOCAL_CRATE).clone(); - for &cnum in tcx.crates(()) { - implications.extend(tcx.stability_implications(cnum)); - all_lib_features.extend(tcx.defined_lib_features(cnum).iter().map(|el| *el)); - } - - // Check that every feature referenced by an `implied_by` exists (for features defined in the - // local crate). - for (implied_by, feature) in tcx.stability_implications(rustc_hir::def_id::LOCAL_CRATE) { - // Only `implied_by` needs to be checked, `feature` is guaranteed to exist. - if !all_lib_features.contains_key(implied_by) { - let span = local_defined_features - .stable - .get(feature) - .map(|(_, span)| span) - .or_else(|| local_defined_features.unstable.get(feature)) - .expect("feature that implied another does not exist"); - tcx.sess - .struct_span_err( - *span, - format!("feature `{implied_by}` implying `{feature}` does not exist"), - ) - .emit(); - } - } - - if !remaining_lib_features.is_empty() { - for (feature, since) in all_lib_features.iter() { + /// For each feature in `defined_features`.. + /// + /// - If it is in `remaining_lib_features` (those features with `#![feature(..)]` attributes in + /// the current crate), check if it is stable (or partially stable) and thus an unnecessary + /// attribute. + /// - If it is in `remaining_implications` (a feature that is referenced by an `implied_by` + /// from the current crate), then remove it from the remaining implications. + /// + /// Once this function has been invoked for every feature (local crate and all extern crates), + /// then.. + /// + /// - If features remain in `remaining_lib_features`, then the user has enabled a feature that + /// does not exist. + /// - If features remain in `remaining_implications`, the `implied_by` refers to a feature that + /// does not exist. + /// + /// By structuring the code in this way: checking the features defined from each crate one at a + /// time, less loading from metadata is performed and thus compiler performance is improved. + fn check_features<'tcx>( + tcx: TyCtxt<'tcx>, + remaining_lib_features: &mut FxIndexMap<&Symbol, Span>, + remaining_implications: &mut FxHashMap<Symbol, Symbol>, + defined_features: &[(Symbol, Option<Symbol>)], + all_implications: &FxHashMap<Symbol, Symbol>, + ) { + for (feature, since) in defined_features { if let Some(since) = since && let Some(span) = remaining_lib_features.get(&feature) { // Warn if the user has enabled an already-stable lib feature. - if let Some(implies) = implications.get(&feature) { + if let Some(implies) = all_implications.get(&feature) { unnecessary_partially_stable_feature_lint(tcx, *span, *feature, *implies, *since); } else { unnecessary_stable_feature_lint(tcx, *span, *feature, *since); } + + } + remaining_lib_features.remove(feature); + + // `feature` is the feature doing the implying, but `implied_by` is the feature with + // the attribute that establishes this relationship. `implied_by` is guaranteed to be a + // feature defined in the local crate because `remaining_implications` is only the + // implications from this crate. + remaining_implications.remove(feature); + + if remaining_lib_features.is_empty() && remaining_implications.is_empty() { + break; } - remaining_lib_features.remove(&feature); - if remaining_lib_features.is_empty() { + } + } + + // All local crate implications need to have the feature that implies it confirmed to exist. + let mut remaining_implications = + tcx.stability_implications(rustc_hir::def_id::LOCAL_CRATE).clone(); + + // We always collect the lib features declared in the current crate, even if there are + // no unknown features, because the collection also does feature attribute validation. + let local_defined_features = tcx.lib_features(()).to_vec(); + if !remaining_lib_features.is_empty() || !remaining_implications.is_empty() { + // Loading the implications of all crates is unavoidable to be able to emit the partial + // stabilization diagnostic, but it can be avoided when there are no + // `remaining_lib_features`. + let mut all_implications = remaining_implications.clone(); + for &cnum in tcx.crates(()) { + all_implications.extend(tcx.stability_implications(cnum)); + } + + check_features( + tcx, + &mut remaining_lib_features, + &mut remaining_implications, + local_defined_features.as_slice(), + &all_implications, + ); + + for &cnum in tcx.crates(()) { + if remaining_lib_features.is_empty() && remaining_implications.is_empty() { break; } + check_features( + tcx, + &mut remaining_lib_features, + &mut remaining_implications, + tcx.defined_lib_features(cnum).to_vec().as_slice(), + &all_implications, + ); } } @@ -1001,6 +1057,22 @@ pub fn check_unused_or_stable_features(tcx: TyCtxt<'_>) { struct_span_err!(tcx.sess, span, E0635, "unknown feature `{}`", feature).emit(); } + for (implied_by, feature) in remaining_implications { + let local_defined_features = tcx.lib_features(()); + let span = local_defined_features + .stable + .get(&feature) + .map(|(_, span)| span) + .or_else(|| local_defined_features.unstable.get(&feature)) + .expect("feature that implied another does not exist"); + tcx.sess + .struct_span_err( + *span, + format!("feature `{implied_by}` implying `{feature}` does not exist"), + ) + .emit(); + } + // FIXME(#44232): the `used_features` table no longer exists, so we // don't lint about unused features. We should re-enable this one day! } @@ -1035,7 +1107,15 @@ fn unnecessary_partially_stable_feature_lint( }); } -fn unnecessary_stable_feature_lint(tcx: TyCtxt<'_>, span: Span, feature: Symbol, since: Symbol) { +fn unnecessary_stable_feature_lint( + tcx: TyCtxt<'_>, + span: Span, + feature: Symbol, + mut since: Symbol, +) { + if since.as_str() == VERSION_PLACEHOLDER { + since = rust_version_symbol(); + } tcx.struct_span_lint_hir(lint::builtin::STABLE_FEATURES, hir::CRATE_HIR_ID, span, |lint| { lint.build(&format!( "the feature `{feature}` has been stable since {since} and no longer requires an \ |