diff options
Diffstat (limited to 'compiler/rustc_lint/src/builtin.rs')
| -rw-r--r-- | compiler/rustc_lint/src/builtin.rs | 143 |
1 files changed, 76 insertions, 67 deletions
diff --git a/compiler/rustc_lint/src/builtin.rs b/compiler/rustc_lint/src/builtin.rs index f7be37dc4a2..69e9f8e1b2c 100644 --- a/compiler/rustc_lint/src/builtin.rs +++ b/compiler/rustc_lint/src/builtin.rs @@ -29,6 +29,7 @@ use rustc_hir::def_id::{CRATE_DEF_ID, DefId, LocalDefId}; use rustc_hir::intravisit::FnKind as HirFnKind; use rustc_hir::{Body, FnDecl, GenericParamKind, PatKind, PredicateOrigin}; use rustc_middle::bug; +use rustc_middle::lint::LevelAndSource; use rustc_middle::ty::layout::LayoutOf; use rustc_middle::ty::print::with_no_trimmed_paths; use rustc_middle::ty::{self, Ty, TyCtxt, TypeVisitableExt, Upcast, VariantDef}; @@ -38,7 +39,7 @@ pub use rustc_session::lint::builtin::*; use rustc_session::{declare_lint, declare_lint_pass, impl_lint_pass}; use rustc_span::edition::Edition; use rustc_span::source_map::Spanned; -use rustc_span::{BytePos, Ident, InnerSpan, Span, Symbol, kw, sym}; +use rustc_span::{BytePos, DUMMY_SP, Ident, InnerSpan, Span, Symbol, kw, sym}; use rustc_target::asm::InlineAsmArch; use rustc_trait_selection::infer::{InferCtxtExt, TyCtxtInferExt}; use rustc_trait_selection::traits::misc::type_allowed_to_implement_copy; @@ -330,7 +331,6 @@ impl EarlyLintPass for UnsafeCode { if let FnKind::Fn( ctxt, _, - _, ast::Fn { sig: ast::FnSig { header: ast::FnHeader { safety: ast::Safety::Unsafe(_), .. }, .. }, body, @@ -419,7 +419,7 @@ impl MissingDoc { return; } - let attrs = cx.tcx.hir().attrs(cx.tcx.local_def_id_to_hir_id(def_id)); + let attrs = cx.tcx.hir_attrs(cx.tcx.local_def_id_to_hir_id(def_id)); let has_doc = attrs.iter().any(has_doc); if !has_doc { cx.emit_span_lint( @@ -441,7 +441,7 @@ impl<'tcx> LateLintPass<'tcx> for MissingDoc { // so we will continue to exclude them for compatibility. // // The documentation on `ExternCrate` is not used at the moment so no need to warn for it. - if let hir::ItemKind::Impl(..) | hir::ItemKind::Use(..) | hir::ItemKind::ExternCrate(_) = + if let hir::ItemKind::Impl(..) | hir::ItemKind::Use(..) | hir::ItemKind::ExternCrate(..) = it.kind { return; @@ -545,22 +545,22 @@ impl<'tcx> LateLintPass<'tcx> for MissingCopyImplementations { return; } let (def, ty) = match item.kind { - hir::ItemKind::Struct(_, ast_generics) => { - if !ast_generics.params.is_empty() { + hir::ItemKind::Struct(_, generics, _) => { + if !generics.params.is_empty() { return; } let def = cx.tcx.adt_def(item.owner_id); (def, Ty::new_adt(cx.tcx, def, ty::List::empty())) } - hir::ItemKind::Union(_, ast_generics) => { - if !ast_generics.params.is_empty() { + hir::ItemKind::Union(_, generics, _) => { + if !generics.params.is_empty() { return; } let def = cx.tcx.adt_def(item.owner_id); (def, Ty::new_adt(cx.tcx, def, ty::List::empty())) } - hir::ItemKind::Enum(_, ast_generics) => { - if !ast_generics.params.is_empty() { + hir::ItemKind::Enum(_, generics, _) => { + if !generics.params.is_empty() { return; } let def = cx.tcx.adt_def(item.owner_id); @@ -635,7 +635,8 @@ fn type_implements_negative_copy_modulo_regions<'tcx>( typing_env: ty::TypingEnv<'tcx>, ) -> bool { let (infcx, param_env) = tcx.infer_ctxt().build_with_typing_env(typing_env); - let trait_ref = ty::TraitRef::new(tcx, tcx.require_lang_item(hir::LangItem::Copy, None), [ty]); + let trait_ref = + ty::TraitRef::new(tcx, tcx.require_lang_item(hir::LangItem::Copy, DUMMY_SP), [ty]); let pred = ty::TraitPredicate { trait_ref, polarity: ty::PredicatePolarity::Negative }; let obligation = traits::Obligation { cause: traits::ObligationCause::dummy(), @@ -695,7 +696,8 @@ impl<'tcx> LateLintPass<'tcx> for MissingDebugImplementations { } // Avoid listing trait impls if the trait is allowed. - let (level, _) = cx.tcx.lint_level_at_node(MISSING_DEBUG_IMPLEMENTATIONS, item.hir_id()); + let LevelAndSource { level, .. } = + cx.tcx.lint_level_at_node(MISSING_DEBUG_IMPLEMENTATIONS, item.hir_id()); if level == Level::Allow { return; } @@ -778,21 +780,19 @@ impl EarlyLintPass for AnonymousParameters { } if let ast::AssocItemKind::Fn(box Fn { ref sig, .. }) = it.kind { for arg in sig.decl.inputs.iter() { - if let ast::PatKind::Ident(_, ident, None) = arg.pat.kind { - if ident.name == kw::Empty { - let ty_snip = cx.sess().source_map().span_to_snippet(arg.ty.span); + if let ast::PatKind::Missing = arg.pat.kind { + let ty_snip = cx.sess().source_map().span_to_snippet(arg.ty.span); - let (ty_snip, appl) = if let Ok(ref snip) = ty_snip { - (snip.as_str(), Applicability::MachineApplicable) - } else { - ("<type>", Applicability::HasPlaceholders) - }; - cx.emit_span_lint( - ANONYMOUS_PARAMETERS, - arg.pat.span, - BuiltinAnonymousParams { suggestion: (arg.pat.span, appl), ty_snip }, - ); - } + let (ty_snip, appl) = if let Ok(ref snip) = ty_snip { + (snip.as_str(), Applicability::MachineApplicable) + } else { + ("<type>", Applicability::HasPlaceholders) + }; + cx.emit_span_lint( + ANONYMOUS_PARAMETERS, + arg.pat.span, + BuiltinAnonymousParams { suggestion: (arg.pat.span, appl), ty_snip }, + ); } } } @@ -949,7 +949,7 @@ declare_lint! { /// /// ### Example /// - /// ```rust,compile_fail + /// ```rust,compile_fail,edition2021 /// #[no_mangle] /// const FOO: i32 = 5; /// ``` @@ -977,6 +977,9 @@ declare_lint! { /// ```rust /// #[unsafe(no_mangle)] /// fn foo<T>(t: T) {} + /// + /// #[unsafe(export_name = "bar")] + /// fn bar<T>(t: T) {} /// ``` /// /// {{produces}} @@ -984,10 +987,11 @@ declare_lint! { /// ### Explanation /// /// A function with generics must have its symbol mangled to accommodate - /// the generic parameter. The [`no_mangle` attribute] has no effect in - /// this situation, and should be removed. + /// the generic parameter. The [`no_mangle`] and [`export_name`] attributes + /// have no effect in this situation, and should be removed. /// - /// [`no_mangle` attribute]: https://doc.rust-lang.org/reference/abi.html#the-no_mangle-attribute + /// [`no_mangle`]: https://doc.rust-lang.org/reference/abi.html#the-no_mangle-attribute + /// [`export_name`]: https://doc.rust-lang.org/reference/abi.html#the-export_name-attribute NO_MANGLE_GENERIC_ITEMS, Warn, "generic items must be mangled" @@ -997,8 +1001,8 @@ declare_lint_pass!(InvalidNoMangleItems => [NO_MANGLE_CONST_ITEMS, NO_MANGLE_GEN impl<'tcx> LateLintPass<'tcx> for InvalidNoMangleItems { fn check_item(&mut self, cx: &LateContext<'_>, it: &hir::Item<'_>) { - let attrs = cx.tcx.hir().attrs(it.hir_id()); - let check_no_mangle_on_generic_fn = |no_mangle_attr: &hir::Attribute, + let attrs = cx.tcx.hir_attrs(it.hir_id()); + let check_no_mangle_on_generic_fn = |attr: &hir::Attribute, impl_generics: Option<&hir::Generics<'_>>, generics: &hir::Generics<'_>, span| { @@ -1011,7 +1015,7 @@ impl<'tcx> LateLintPass<'tcx> for InvalidNoMangleItems { cx.emit_span_lint( NO_MANGLE_GENERIC_ITEMS, span, - BuiltinNoMangleGeneric { suggestion: no_mangle_attr.span() }, + BuiltinNoMangleGeneric { suggestion: attr.span() }, ); break; } @@ -1020,8 +1024,10 @@ impl<'tcx> LateLintPass<'tcx> for InvalidNoMangleItems { }; match it.kind { hir::ItemKind::Fn { generics, .. } => { - if let Some(no_mangle_attr) = attr::find_by_name(attrs, sym::no_mangle) { - check_no_mangle_on_generic_fn(no_mangle_attr, None, generics, it.span); + if let Some(attr) = attr::find_by_name(attrs, sym::export_name) + .or_else(|| attr::find_by_name(attrs, sym::no_mangle)) + { + check_no_mangle_on_generic_fn(attr, None, generics, it.span); } } hir::ItemKind::Const(..) => { @@ -1049,11 +1055,12 @@ impl<'tcx> LateLintPass<'tcx> for InvalidNoMangleItems { hir::ItemKind::Impl(hir::Impl { generics, items, .. }) => { for it in *items { if let hir::AssocItemKind::Fn { .. } = it.kind { - if let Some(no_mangle_attr) = - attr::find_by_name(cx.tcx.hir().attrs(it.id.hir_id()), sym::no_mangle) + let attrs = cx.tcx.hir_attrs(it.id.hir_id()); + if let Some(attr) = attr::find_by_name(attrs, sym::export_name) + .or_else(|| attr::find_by_name(attrs, sym::no_mangle)) { check_no_mangle_on_generic_fn( - no_mangle_attr, + attr, Some(generics), cx.tcx.hir_get_generics(it.id.owner_id.def_id).unwrap(), it.span, @@ -1416,7 +1423,7 @@ impl TypeAliasBounds { impl<'tcx> LateLintPass<'tcx> for TypeAliasBounds { fn check_item(&mut self, cx: &LateContext<'_>, item: &hir::Item<'_>) { - let hir::ItemKind::TyAlias(hir_ty, generics) = item.kind else { return }; + let hir::ItemKind::TyAlias(_, generics, hir_ty) = item.kind else { return }; // There must not be a where clause. if generics.predicates.is_empty() { @@ -1989,7 +1996,7 @@ impl ExplicitOutlivesRequirements { inferred_outlives .filter_map(|(clause, _)| match clause.kind().skip_binder() { - ty::ClauseKind::RegionOutlives(ty::OutlivesPredicate(a, b)) => match *a { + ty::ClauseKind::RegionOutlives(ty::OutlivesPredicate(a, b)) => match a.kind() { ty::ReEarlyParam(ebr) if item_generics.region_param(ebr, tcx).def_id == lifetime.to_def_id() => { @@ -2039,7 +2046,7 @@ impl ExplicitOutlivesRequirements { let is_inferred = match tcx.named_bound_var(lifetime.hir_id) { Some(ResolvedArg::EarlyBound(def_id)) => inferred_outlives .iter() - .any(|r| matches!(**r, ty::ReEarlyParam(ebr) if { item_generics.region_param(ebr, tcx).def_id == def_id.to_def_id() })), + .any(|r| matches!(r.kind(), ty::ReEarlyParam(ebr) if { item_generics.region_param(ebr, tcx).def_id == def_id.to_def_id() })), _ => false, }; @@ -2119,9 +2126,9 @@ impl<'tcx> LateLintPass<'tcx> for ExplicitOutlivesRequirements { use rustc_middle::middle::resolve_bound_vars::ResolvedArg; let def_id = item.owner_id.def_id; - if let hir::ItemKind::Struct(_, hir_generics) - | hir::ItemKind::Enum(_, hir_generics) - | hir::ItemKind::Union(_, hir_generics) = item.kind + if let hir::ItemKind::Struct(_, generics, _) + | hir::ItemKind::Enum(_, generics, _) + | hir::ItemKind::Union(_, generics, _) = item.kind { let inferred_outlives = cx.tcx.inferred_outlives_of(def_id); if inferred_outlives.is_empty() { @@ -2129,7 +2136,7 @@ impl<'tcx> LateLintPass<'tcx> for ExplicitOutlivesRequirements { } let ty_generics = cx.tcx.generics_of(def_id); - let num_where_predicates = hir_generics + let num_where_predicates = generics .predicates .iter() .filter(|predicate| predicate.kind.in_where_clause()) @@ -2139,7 +2146,7 @@ impl<'tcx> LateLintPass<'tcx> for ExplicitOutlivesRequirements { let mut lint_spans = Vec::new(); let mut where_lint_spans = Vec::new(); let mut dropped_where_predicate_count = 0; - for (i, where_predicate) in hir_generics.predicates.iter().enumerate() { + for (i, where_predicate) in generics.predicates.iter().enumerate() { let (relevant_lifetimes, bounds, predicate_span, in_where_clause) = match where_predicate.kind { hir::WherePredicateKind::RegionPredicate(predicate) => { @@ -2222,7 +2229,7 @@ impl<'tcx> LateLintPass<'tcx> for ExplicitOutlivesRequirements { } else if i + 1 < num_where_predicates { // If all the bounds on a predicate were inferable and there are // further predicates, we want to eat the trailing comma. - let next_predicate_span = hir_generics.predicates[i + 1].span; + let next_predicate_span = generics.predicates[i + 1].span; if next_predicate_span.from_expansion() { where_lint_spans.push(predicate_span); } else { @@ -2231,7 +2238,7 @@ impl<'tcx> LateLintPass<'tcx> for ExplicitOutlivesRequirements { } } else { // Eat the optional trailing comma after the last predicate. - let where_span = hir_generics.where_clause_span; + let where_span = generics.where_clause_span; if where_span.from_expansion() { where_lint_spans.push(predicate_span); } else { @@ -2249,18 +2256,18 @@ impl<'tcx> LateLintPass<'tcx> for ExplicitOutlivesRequirements { // If all predicates in where clause are inferable, drop the entire clause // (including the `where`) - if hir_generics.has_where_clause_predicates + if generics.has_where_clause_predicates && dropped_where_predicate_count == num_where_predicates { - let where_span = hir_generics.where_clause_span; + let where_span = generics.where_clause_span; // Extend the where clause back to the closing `>` of the // generics, except for tuple struct, which have the `where` // after the fields of the struct. let full_where_span = - if let hir::ItemKind::Struct(hir::VariantData::Tuple(..), _) = item.kind { + if let hir::ItemKind::Struct(_, _, hir::VariantData::Tuple(..)) = item.kind { where_span } else { - hir_generics.span.shrink_to_hi().to(where_span) + generics.span.shrink_to_hi().to(where_span) }; // Due to macro expansions, the `full_where_span` might not actually contain all @@ -2582,34 +2589,35 @@ impl<'tcx> LateLintPass<'tcx> for InvalidValue { ) -> Option<InitError> { let ty = cx.tcx.try_normalize_erasing_regions(cx.typing_env(), ty).unwrap_or(ty); - use rustc_type_ir::TyKind::*; match ty.kind() { // Primitive types that don't like 0 as a value. - Ref(..) => Some("references must be non-null".into()), - Adt(..) if ty.is_box() => Some("`Box` must be non-null".into()), - FnPtr(..) => Some("function pointers must be non-null".into()), - Never => Some("the `!` type has no valid value".into()), - RawPtr(ty, _) if matches!(ty.kind(), Dynamic(..)) => + ty::Ref(..) => Some("references must be non-null".into()), + ty::Adt(..) if ty.is_box() => Some("`Box` must be non-null".into()), + ty::FnPtr(..) => Some("function pointers must be non-null".into()), + ty::Never => Some("the `!` type has no valid value".into()), + ty::RawPtr(ty, _) if matches!(ty.kind(), ty::Dynamic(..)) => // raw ptr to dyn Trait { Some("the vtable of a wide raw pointer must be non-null".into()) } // Primitive types with other constraints. - Bool if init == InitKind::Uninit => { + ty::Bool if init == InitKind::Uninit => { Some("booleans must be either `true` or `false`".into()) } - Char if init == InitKind::Uninit => { + ty::Char if init == InitKind::Uninit => { Some("characters must be a valid Unicode codepoint".into()) } - Int(_) | Uint(_) if init == InitKind::Uninit => { + ty::Int(_) | ty::Uint(_) if init == InitKind::Uninit => { Some("integers must be initialized".into()) } - Float(_) if init == InitKind::Uninit => Some("floats must be initialized".into()), - RawPtr(_, _) if init == InitKind::Uninit => { + ty::Float(_) if init == InitKind::Uninit => { + Some("floats must be initialized".into()) + } + ty::RawPtr(_, _) if init == InitKind::Uninit => { Some("raw pointers must be initialized".into()) } // Recurse and checks for some compound types. (but not unions) - Adt(adt_def, args) if !adt_def.is_union() => { + ty::Adt(adt_def, args) if !adt_def.is_union() => { // Handle structs. if adt_def.is_struct() { return variant_find_init_error( @@ -2675,11 +2683,11 @@ impl<'tcx> LateLintPass<'tcx> for InvalidValue { // We couldn't find anything wrong here. None } - Tuple(..) => { + ty::Tuple(..) => { // Proceed recursively, check all fields. ty.tuple_fields().iter().find_map(|field| ty_find_init_error(cx, field, init)) } - Array(ty, len) => { + ty::Array(ty, len) => { if matches!(len.try_to_target_usize(cx.tcx), Some(v) if v > 0) { // Array length known at array non-empty -- recurse. ty_find_init_error(cx, *ty, init) @@ -3115,6 +3123,7 @@ impl EarlyLintPass for SpecialModuleName { for item in &krate.items { if let ast::ItemKind::Mod( _, + ident, ast::ModKind::Unloaded | ast::ModKind::Loaded(_, ast::Inline::No, _, _), ) = item.kind { @@ -3122,7 +3131,7 @@ impl EarlyLintPass for SpecialModuleName { continue; } - match item.ident.name.as_str() { + match ident.name.as_str() { "lib" => cx.emit_span_lint( SPECIAL_MODULE_NAME, item.span, |