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| author | Laurențiu Nicola <lnicola@users.noreply.github.com> | 2025-06-09 12:55:47 +0000 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2025-06-09 12:55:47 +0000 |
| commit | f5bfde2303f7b6784224230a8cb8d2bcb743b9f8 (patch) | |
| tree | 1fa465adaaf07355079312d2e1aa3e8594acadc7 /compiler/rustc_lint/src | |
| parent | 37c8788c5ecadcd2fc55435bcd7a4677884d541e (diff) | |
| parent | 88223c56d9352a14bf4e91d706d68ca3a696bcdf (diff) | |
| download | rust-f5bfde2303f7b6784224230a8cb8d2bcb743b9f8.tar.gz rust-f5bfde2303f7b6784224230a8cb8d2bcb743b9f8.zip | |
Merge pull request #19954 from lnicola/sync-from-rust
minor: Sync from downstream
Diffstat (limited to 'compiler/rustc_lint/src')
19 files changed, 1141 insertions, 395 deletions
diff --git a/compiler/rustc_lint/src/autorefs.rs b/compiler/rustc_lint/src/autorefs.rs index 5de2cbf9939..845a1f1b81f 100644 --- a/compiler/rustc_lint/src/autorefs.rs +++ b/compiler/rustc_lint/src/autorefs.rs @@ -16,7 +16,7 @@ declare_lint! { /// /// ### Example /// - /// ```rust + /// ```rust,compile_fail /// unsafe fn fun(ptr: *mut [u8]) -> *mut [u8] { /// unsafe { &raw mut (*ptr)[..16] } /// // ^^^^^^ this calls `IndexMut::index_mut(&mut ..., ..16)`, @@ -51,7 +51,7 @@ declare_lint! { /// } /// ``` pub DANGEROUS_IMPLICIT_AUTOREFS, - Warn, + Deny, "implicit reference to a dereference of a raw pointer", report_in_external_macro } diff --git a/compiler/rustc_lint/src/builtin.rs b/compiler/rustc_lint/src/builtin.rs index 95e31e4af1e..69e9f8e1b2c 100644 --- a/compiler/rustc_lint/src/builtin.rs +++ b/compiler/rustc_lint/src/builtin.rs @@ -39,7 +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; @@ -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(), @@ -1422,7 +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() { @@ -2125,9 +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() { @@ -2135,7 +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()) @@ -2145,7 +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) => { @@ -2228,7 +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 { @@ -2237,7 +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 { @@ -2255,18 +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 diff --git a/compiler/rustc_lint/src/default_could_be_derived.rs b/compiler/rustc_lint/src/default_could_be_derived.rs index 78d129642dc..7734f441df2 100644 --- a/compiler/rustc_lint/src/default_could_be_derived.rs +++ b/compiler/rustc_lint/src/default_could_be_derived.rs @@ -95,8 +95,8 @@ impl<'tcx> LateLintPass<'tcx> for DefaultCouldBeDerived { kind: hir::ItemKind::Struct( _, - hir::VariantData::Struct { fields, recovered: _ }, _generics, + hir::VariantData::Struct { fields, recovered: _ }, ), .. })) => fields.iter().map(|f| (f.ident.name, f)).collect::<FxHashMap<_, _>>(), diff --git a/compiler/rustc_lint/src/early.rs b/compiler/rustc_lint/src/early.rs index f9601fa5ef1..4978f293ab7 100644 --- a/compiler/rustc_lint/src/early.rs +++ b/compiler/rustc_lint/src/early.rs @@ -18,7 +18,7 @@ use tracing::debug; use crate::context::{EarlyContext, LintContext, LintStore}; use crate::passes::{EarlyLintPass, EarlyLintPassObject}; -mod diagnostics; +pub(super) mod diagnostics; macro_rules! lint_callback { ($cx:expr, $f:ident, $($args:expr),*) => ({ $cx.pass.$f(&$cx.context, $($args),*); @@ -40,7 +40,7 @@ impl<'ecx, 'tcx, T: EarlyLintPass> EarlyContextAndPass<'ecx, 'tcx, T> { for early_lint in self.context.buffered.take(id) { let BufferedEarlyLint { span, node_id: _, lint_id, diagnostic } = early_lint; self.context.opt_span_lint(lint_id.lint, span, |diag| { - diagnostics::decorate_lint(self.context.sess(), self.tcx, diagnostic, diag); + diagnostics::decorate_builtin_lint(self.context.sess(), self.tcx, diagnostic, diag); }); } } @@ -74,8 +74,8 @@ impl<'ecx, 'tcx, T: EarlyLintPass> EarlyContextAndPass<'ecx, 'tcx, T> { impl<'ast, 'ecx, 'tcx, T: EarlyLintPass> ast_visit::Visitor<'ast> for EarlyContextAndPass<'ecx, 'tcx, T> { - fn visit_coroutine_kind(&mut self, coroutine_kind: &'ast ast::CoroutineKind) -> Self::Result { - self.check_id(coroutine_kind.closure_id()); + fn visit_id(&mut self, id: rustc_ast::NodeId) { + self.check_id(id); } fn visit_param(&mut self, param: &'ast ast::Param) { @@ -101,7 +101,6 @@ impl<'ast, 'ecx, 'tcx, T: EarlyLintPass> ast_visit::Visitor<'ast> fn visit_pat(&mut self, p: &'ast ast::Pat) { lint_callback!(self, check_pat, p); - self.check_id(p.id); ast_visit::walk_pat(self, p); lint_callback!(self, check_pat_post, p); } @@ -112,11 +111,6 @@ impl<'ast, 'ecx, 'tcx, T: EarlyLintPass> ast_visit::Visitor<'ast> }); } - fn visit_anon_const(&mut self, c: &'ast ast::AnonConst) { - self.check_id(c.id); - ast_visit::walk_anon_const(self, c); - } - fn visit_expr(&mut self, e: &'ast ast::Expr) { self.with_lint_attrs(e.id, &e.attrs, |cx| { lint_callback!(cx, check_expr, e); @@ -157,13 +151,6 @@ impl<'ast, 'ecx, 'tcx, T: EarlyLintPass> ast_visit::Visitor<'ast> ast_visit::walk_fn(self, fk); } - fn visit_variant_data(&mut self, s: &'ast ast::VariantData) { - if let Some(ctor_node_id) = s.ctor_node_id() { - self.check_id(ctor_node_id); - } - ast_visit::walk_struct_def(self, s); - } - fn visit_field_def(&mut self, s: &'ast ast::FieldDef) { self.with_lint_attrs(s.id, &s.attrs, |cx| { ast_visit::walk_field_def(cx, s); @@ -179,7 +166,6 @@ impl<'ast, 'ecx, 'tcx, T: EarlyLintPass> ast_visit::Visitor<'ast> fn visit_ty(&mut self, t: &'ast ast::Ty) { lint_callback!(self, check_ty, t); - self.check_id(t.id); ast_visit::walk_ty(self, t); } @@ -196,7 +182,6 @@ impl<'ast, 'ecx, 'tcx, T: EarlyLintPass> ast_visit::Visitor<'ast> fn visit_block(&mut self, b: &'ast ast::Block) { lint_callback!(self, check_block, b); - self.check_id(b.id); ast_visit::walk_block(self, b); } @@ -257,29 +242,13 @@ impl<'ast, 'ecx, 'tcx, T: EarlyLintPass> ast_visit::Visitor<'ast> }); } - fn visit_lifetime(&mut self, lt: &'ast ast::Lifetime, _: ast_visit::LifetimeCtxt) { - self.check_id(lt.id); - ast_visit::walk_lifetime(self, lt); - } - - fn visit_path(&mut self, p: &'ast ast::Path, id: ast::NodeId) { - self.check_id(id); - ast_visit::walk_path(self, p); - } - - fn visit_path_segment(&mut self, s: &'ast ast::PathSegment) { - self.check_id(s.id); - ast_visit::walk_path_segment(self, s); - } - fn visit_attribute(&mut self, attr: &'ast ast::Attribute) { lint_callback!(self, check_attribute, attr); ast_visit::walk_attribute(self, attr); } - fn visit_mac_def(&mut self, mac: &'ast ast::MacroDef, id: ast::NodeId) { + fn visit_macro_def(&mut self, mac: &'ast ast::MacroDef) { lint_callback!(self, check_mac_def, mac); - self.check_id(id); } fn visit_mac_call(&mut self, mac: &'ast ast::MacCall) { diff --git a/compiler/rustc_lint/src/early/diagnostics.rs b/compiler/rustc_lint/src/early/diagnostics.rs index 40ca9e05d95..60c477dd6c7 100644 --- a/compiler/rustc_lint/src/early/diagnostics.rs +++ b/compiler/rustc_lint/src/early/diagnostics.rs @@ -10,15 +10,15 @@ use rustc_errors::{ use rustc_middle::middle::stability; use rustc_middle::ty::TyCtxt; use rustc_session::Session; -use rustc_session::lint::{BuiltinLintDiag, ElidedLifetimeResolution}; -use rustc_span::{BytePos, kw}; +use rustc_session::lint::BuiltinLintDiag; +use rustc_span::BytePos; use tracing::debug; -use crate::lints::{self, ElidedNamedLifetime}; +use crate::lints; mod check_cfg; -pub(super) fn decorate_lint( +pub fn decorate_builtin_lint( sess: &Session, tcx: Option<TyCtxt<'_>>, diagnostic: BuiltinLintDiag, @@ -187,6 +187,27 @@ pub(super) fn decorate_lint( lints::ReservedMultihash { suggestion }.decorate_lint(diag); } } + BuiltinLintDiag::HiddenUnicodeCodepoints { + label, + count, + span_label, + labels, + escape, + spans, + } => { + lints::HiddenUnicodeCodepointsDiag { + label: &label, + count, + span_label, + labels: labels.map(|spans| lints::HiddenUnicodeCodepointsDiagLabels { spans }), + sub: if escape { + lints::HiddenUnicodeCodepointsDiagSub::Escape { spans } + } else { + lints::HiddenUnicodeCodepointsDiagSub::NoEscape { spans } + }, + } + .decorate_lint(diag); + } BuiltinLintDiag::UnusedBuiltinAttribute { attr_name, macro_name, invoc_span } => { lints::UnusedBuiltinAttribute { invoc_span, attr_name, macro_name }.decorate_lint(diag); } @@ -292,8 +313,8 @@ pub(super) fn decorate_lint( BuiltinLintDiag::ByteSliceInPackedStructWithDerive { ty } => { lints::ByteSliceInPackedStructWithDerive { ty }.decorate_lint(diag); } - BuiltinLintDiag::UnusedExternCrate { removal_span } => { - lints::UnusedExternCrate { removal_span }.decorate_lint(diag); + BuiltinLintDiag::UnusedExternCrate { span, removal_span } => { + lints::UnusedExternCrate { span, removal_span }.decorate_lint(diag); } BuiltinLintDiag::ExternCrateNotIdiomatic { vis_span, ident_span } => { let suggestion_span = vis_span.between(ident_span); @@ -450,16 +471,5 @@ pub(super) fn decorate_lint( BuiltinLintDiag::UnexpectedBuiltinCfg { cfg, cfg_name, controlled_by } => { lints::UnexpectedBuiltinCfg { cfg, cfg_name, controlled_by }.decorate_lint(diag) } - BuiltinLintDiag::ElidedNamedLifetimes { elided: (span, kind), resolution } => { - match resolution { - ElidedLifetimeResolution::Static => { - ElidedNamedLifetime { span, kind, name: kw::StaticLifetime, declaration: None } - } - ElidedLifetimeResolution::Param(name, declaration) => { - ElidedNamedLifetime { span, kind, name, declaration: Some(declaration) } - } - } - .decorate_lint(diag) - } } } diff --git a/compiler/rustc_lint/src/early/diagnostics/check_cfg.rs b/compiler/rustc_lint/src/early/diagnostics/check_cfg.rs index 946dbc34f71..e2f5dd315d5 100644 --- a/compiler/rustc_lint/src/early/diagnostics/check_cfg.rs +++ b/compiler/rustc_lint/src/early/diagnostics/check_cfg.rs @@ -140,6 +140,14 @@ pub(super) fn unexpected_cfg_name( let code_sugg = if is_feature_cfg && is_from_cargo { lints::unexpected_cfg_name::CodeSuggestion::DefineFeatures + // Suggest correct `version("..")` predicate syntax + } else if let Some((_value, value_span)) = value + && name == sym::version + { + lints::unexpected_cfg_name::CodeSuggestion::VersionSyntax { + between_name_and_value: name_span.between(value_span), + after_value: value_span.shrink_to_hi(), + } // Suggest the most probable if we found one } else if let Some(best_match) = find_best_match_for_name(&possibilities, name, None) { is_feature_cfg |= best_match == sym::feature; diff --git a/compiler/rustc_lint/src/hidden_unicode_codepoints.rs b/compiler/rustc_lint/src/hidden_unicode_codepoints.rs deleted file mode 100644 index 491c2826baa..00000000000 --- a/compiler/rustc_lint/src/hidden_unicode_codepoints.rs +++ /dev/null @@ -1,136 +0,0 @@ -use ast::util::unicode::{TEXT_FLOW_CONTROL_CHARS, contains_text_flow_control_chars}; -use rustc_ast as ast; -use rustc_session::{declare_lint, declare_lint_pass}; -use rustc_span::{BytePos, Span, Symbol}; - -use crate::lints::{ - HiddenUnicodeCodepointsDiag, HiddenUnicodeCodepointsDiagLabels, HiddenUnicodeCodepointsDiagSub, -}; -use crate::{EarlyContext, EarlyLintPass, LintContext}; - -declare_lint! { - #[allow(text_direction_codepoint_in_literal)] - /// The `text_direction_codepoint_in_literal` lint detects Unicode codepoints that change the - /// visual representation of text on screen in a way that does not correspond to their on - /// memory representation. - /// - /// ### Explanation - /// - /// The unicode characters `\u{202A}`, `\u{202B}`, `\u{202D}`, `\u{202E}`, `\u{2066}`, - /// `\u{2067}`, `\u{2068}`, `\u{202C}` and `\u{2069}` make the flow of text on screen change - /// its direction on software that supports these codepoints. This makes the text "abc" display - /// as "cba" on screen. By leveraging software that supports these, people can write specially - /// crafted literals that make the surrounding code seem like it's performing one action, when - /// in reality it is performing another. Because of this, we proactively lint against their - /// presence to avoid surprises. - /// - /// ### Example - /// - /// ```rust,compile_fail - /// #![deny(text_direction_codepoint_in_literal)] - /// fn main() { - /// println!("{:?}", ''); - /// } - /// ``` - /// - /// {{produces}} - /// - pub TEXT_DIRECTION_CODEPOINT_IN_LITERAL, - Deny, - "detect special Unicode codepoints that affect the visual representation of text on screen, \ - changing the direction in which text flows", -} - -declare_lint_pass!(HiddenUnicodeCodepoints => [TEXT_DIRECTION_CODEPOINT_IN_LITERAL]); - -impl HiddenUnicodeCodepoints { - fn lint_text_direction_codepoint( - &self, - cx: &EarlyContext<'_>, - text: Symbol, - span: Span, - padding: u32, - point_at_inner_spans: bool, - label: &str, - ) { - // Obtain the `Span`s for each of the forbidden chars. - let spans: Vec<_> = text - .as_str() - .char_indices() - .filter_map(|(i, c)| { - TEXT_FLOW_CONTROL_CHARS.contains(&c).then(|| { - let lo = span.lo() + BytePos(i as u32 + padding); - (c, span.with_lo(lo).with_hi(lo + BytePos(c.len_utf8() as u32))) - }) - }) - .collect(); - - let count = spans.len(); - let labels = point_at_inner_spans - .then_some(HiddenUnicodeCodepointsDiagLabels { spans: spans.clone() }); - let sub = if point_at_inner_spans && !spans.is_empty() { - HiddenUnicodeCodepointsDiagSub::Escape { spans } - } else { - HiddenUnicodeCodepointsDiagSub::NoEscape { spans } - }; - - cx.emit_span_lint( - TEXT_DIRECTION_CODEPOINT_IN_LITERAL, - span, - HiddenUnicodeCodepointsDiag { label, count, span_label: span, labels, sub }, - ); - } - - fn check_literal( - &mut self, - cx: &EarlyContext<'_>, - text: Symbol, - lit_kind: ast::token::LitKind, - span: Span, - label: &'static str, - ) { - if !contains_text_flow_control_chars(text.as_str()) { - return; - } - let (padding, point_at_inner_spans) = match lit_kind { - // account for `"` or `'` - ast::token::LitKind::Str | ast::token::LitKind::Char => (1, true), - // account for `c"` - ast::token::LitKind::CStr => (2, true), - // account for `r###"` - ast::token::LitKind::StrRaw(n) => (n as u32 + 2, true), - // account for `cr###"` - ast::token::LitKind::CStrRaw(n) => (n as u32 + 3, true), - // suppress bad literals. - ast::token::LitKind::Err(_) => return, - // Be conservative just in case new literals do support these. - _ => (0, false), - }; - self.lint_text_direction_codepoint(cx, text, span, padding, point_at_inner_spans, label); - } -} - -impl EarlyLintPass for HiddenUnicodeCodepoints { - fn check_attribute(&mut self, cx: &EarlyContext<'_>, attr: &ast::Attribute) { - if let ast::AttrKind::DocComment(_, comment) = attr.kind { - if contains_text_flow_control_chars(comment.as_str()) { - self.lint_text_direction_codepoint(cx, comment, attr.span, 0, false, "doc comment"); - } - } - } - - #[inline] - fn check_expr(&mut self, cx: &EarlyContext<'_>, expr: &ast::Expr) { - // byte strings are already handled well enough by `EscapeError::NonAsciiCharInByteString` - match &expr.kind { - ast::ExprKind::Lit(token_lit) => { - self.check_literal(cx, token_lit.symbol, token_lit.kind, expr.span, "literal"); - } - ast::ExprKind::FormatArgs(args) => { - let (lit_kind, text) = args.uncooked_fmt_str; - self.check_literal(cx, text, lit_kind, args.span, "format string"); - } - _ => {} - }; - } -} diff --git a/compiler/rustc_lint/src/impl_trait_overcaptures.rs b/compiler/rustc_lint/src/impl_trait_overcaptures.rs index a8f45d043be..8124d7f7c86 100644 --- a/compiler/rustc_lint/src/impl_trait_overcaptures.rs +++ b/compiler/rustc_lint/src/impl_trait_overcaptures.rs @@ -461,7 +461,7 @@ fn extract_def_id_from_arg<'tcx>( generics: &'tcx ty::Generics, arg: ty::GenericArg<'tcx>, ) -> DefId { - match arg.unpack() { + match arg.kind() { ty::GenericArgKind::Lifetime(re) => match re.kind() { ty::ReEarlyParam(ebr) => generics.region_param(ebr, tcx).def_id, ty::ReBound( diff --git a/compiler/rustc_lint/src/internal.rs b/compiler/rustc_lint/src/internal.rs index 1d4be24ea9f..1805a674d68 100644 --- a/compiler/rustc_lint/src/internal.rs +++ b/compiler/rustc_lint/src/internal.rs @@ -328,16 +328,19 @@ impl<'tcx> LateLintPass<'tcx> for TypeIr { fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx hir::Item<'tcx>) { let rustc_hir::ItemKind::Use(path, kind) = item.kind else { return }; - let is_mod_inherent = |def_id| cx.tcx.is_diagnostic_item(sym::type_ir_inherent, def_id); + let is_mod_inherent = |res: Res| { + res.opt_def_id() + .is_some_and(|def_id| cx.tcx.is_diagnostic_item(sym::type_ir_inherent, def_id)) + }; // Path segments except for the final. - if let Some(seg) = - path.segments.iter().find(|seg| seg.res.opt_def_id().is_some_and(is_mod_inherent)) - { + if let Some(seg) = path.segments.iter().find(|seg| is_mod_inherent(seg.res)) { cx.emit_span_lint(USAGE_OF_TYPE_IR_INHERENT, seg.ident.span, TypeIrInherentUsage); } // Final path resolutions, like `use rustc_type_ir::inherent` - else if path.res.iter().any(|res| res.opt_def_id().is_some_and(is_mod_inherent)) { + else if let Some(type_ns) = path.res.type_ns + && is_mod_inherent(type_ns) + { cx.emit_span_lint( USAGE_OF_TYPE_IR_INHERENT, path.segments.last().unwrap().ident.span, @@ -346,13 +349,12 @@ impl<'tcx> LateLintPass<'tcx> for TypeIr { } let (lo, hi, snippet) = match path.segments { - [.., penultimate, segment] - if penultimate.res.opt_def_id().is_some_and(is_mod_inherent) => - { + [.., penultimate, segment] if is_mod_inherent(penultimate.res) => { (segment.ident.span, item.kind.ident().unwrap().span, "*") } [.., segment] - if path.res.iter().flat_map(Res::opt_def_id).any(is_mod_inherent) + if let Some(type_ns) = path.res.type_ns + && is_mod_inherent(type_ns) && let rustc_hir::UseKind::Single(ident) = kind => { let (lo, snippet) = diff --git a/compiler/rustc_lint/src/levels.rs b/compiler/rustc_lint/src/levels.rs index 00775647ac6..c52dbd892bf 100644 --- a/compiler/rustc_lint/src/levels.rs +++ b/compiler/rustc_lint/src/levels.rs @@ -126,7 +126,7 @@ fn lints_that_dont_need_to_run(tcx: TyCtxt<'_>, (): ()) -> UnordSet<LintId> { .filter(|lint| { // Lints that show up in future-compat reports must always be run. let has_future_breakage = - lint.future_incompatible.is_some_and(|fut| fut.reason.has_future_breakage()); + lint.future_incompatible.is_some_and(|fut| fut.report_in_deps); !has_future_breakage && !lint.eval_always }) .filter(|lint| { diff --git a/compiler/rustc_lint/src/lib.rs b/compiler/rustc_lint/src/lib.rs index 4ff586a79a6..72bfeaddbf1 100644 --- a/compiler/rustc_lint/src/lib.rs +++ b/compiler/rustc_lint/src/lib.rs @@ -48,7 +48,6 @@ mod errors; mod expect; mod for_loops_over_fallibles; mod foreign_modules; -pub mod hidden_unicode_codepoints; mod if_let_rescope; mod impl_trait_overcaptures; mod internal; @@ -56,6 +55,7 @@ mod invalid_from_utf8; mod late; mod let_underscore; mod levels; +mod lifetime_syntax; mod lints; mod macro_expr_fragment_specifier_2024_migration; mod map_unit_fn; @@ -75,6 +75,7 @@ mod reference_casting; mod shadowed_into_iter; mod static_mut_refs; mod traits; +mod transmute; mod types; mod unit_bindings; mod unqualified_local_imports; @@ -91,12 +92,12 @@ use deref_into_dyn_supertrait::*; use drop_forget_useless::*; use enum_intrinsics_non_enums::EnumIntrinsicsNonEnums; use for_loops_over_fallibles::*; -use hidden_unicode_codepoints::*; use if_let_rescope::IfLetRescope; use impl_trait_overcaptures::ImplTraitOvercaptures; use internal::*; use invalid_from_utf8::*; use let_underscore::*; +use lifetime_syntax::*; use macro_expr_fragment_specifier_2024_migration::*; use map_unit_fn::*; use multiple_supertrait_upcastable::*; @@ -118,6 +119,7 @@ use shadowed_into_iter::ShadowedIntoIter; pub use shadowed_into_iter::{ARRAY_INTO_ITER, BOXED_SLICE_INTO_ITER}; use static_mut_refs::*; use traits::*; +use transmute::CheckTransmutes; use types::*; use unit_bindings::*; use unqualified_local_imports::*; @@ -126,6 +128,7 @@ use unused::*; #[rustfmt::skip] pub use builtin::{MissingDoc, SoftLints}; pub use context::{CheckLintNameResult, EarlyContext, LateContext, LintContext, LintStore}; +pub use early::diagnostics::decorate_builtin_lint; pub use early::{EarlyCheckNode, check_ast_node}; pub use late::{check_crate, late_lint_mod, unerased_lint_store}; pub use levels::LintLevelsBuilder; @@ -174,7 +177,6 @@ early_lint_methods!( DeprecatedAttr: DeprecatedAttr::default(), WhileTrue: WhileTrue, NonAsciiIdents: NonAsciiIdents, - HiddenUnicodeCodepoints: HiddenUnicodeCodepoints, IncompleteInternalFeatures: IncompleteInternalFeatures, RedundantSemicolons: RedundantSemicolons, UnusedDocComment: UnusedDocComment, @@ -245,6 +247,8 @@ late_lint_methods!( IfLetRescope: IfLetRescope::default(), StaticMutRefs: StaticMutRefs, UnqualifiedLocalImports: UnqualifiedLocalImports, + CheckTransmutes: CheckTransmutes, + LifetimeSyntax: LifetimeSyntax, ] ] ); @@ -352,6 +356,7 @@ fn register_builtins(store: &mut LintStore) { store.register_renamed("unused_tuple_struct_fields", "dead_code"); store.register_renamed("static_mut_ref", "static_mut_refs"); store.register_renamed("temporary_cstring_as_ptr", "dangling_pointers_from_temporaries"); + store.register_renamed("elided_named_lifetimes", "mismatched_lifetime_syntaxes"); // These were moved to tool lints, but rustc still sees them when compiling normally, before // tool lints are registered, so `check_tool_name_for_backwards_compat` doesn't work. Use @@ -594,7 +599,6 @@ fn register_builtins(store: &mut LintStore) { "converted into hard error, see PR #125380 \ <https://github.com/rust-lang/rust/pull/125380> for more information", ); - store.register_removed("unsupported_calling_conventions", "converted into hard error"); store.register_removed( "cenum_impl_drop_cast", "converted into hard error, \ diff --git a/compiler/rustc_lint/src/lifetime_syntax.rs b/compiler/rustc_lint/src/lifetime_syntax.rs new file mode 100644 index 00000000000..31b038e6a46 --- /dev/null +++ b/compiler/rustc_lint/src/lifetime_syntax.rs @@ -0,0 +1,503 @@ +use rustc_data_structures::fx::FxIndexMap; +use rustc_hir::intravisit::{self, Visitor}; +use rustc_hir::{self as hir, LifetimeSource}; +use rustc_session::{declare_lint, declare_lint_pass}; +use rustc_span::Span; +use tracing::instrument; + +use crate::{LateContext, LateLintPass, LintContext, lints}; + +declare_lint! { + /// The `mismatched_lifetime_syntaxes` lint detects when the same + /// lifetime is referred to by different syntaxes between function + /// arguments and return values. + /// + /// The three kinds of syntaxes are: + /// + /// 1. Named lifetimes. These are references (`&'a str`) or paths + /// (`Person<'a>`) that use a lifetime with a name, such as + /// `'static` or `'a`. + /// + /// 2. Elided lifetimes. These are references with no explicit + /// lifetime (`&str`), references using the anonymous lifetime + /// (`&'_ str`), and paths using the anonymous lifetime + /// (`Person<'_>`). + /// + /// 3. Hidden lifetimes. These are paths that do not contain any + /// visual indication that it contains a lifetime (`Person`). + /// + /// ### Example + /// + /// ```rust,compile_fail + /// #![deny(mismatched_lifetime_syntaxes)] + /// + /// pub fn mixing_named_with_elided(v: &'static u8) -> &u8 { + /// v + /// } + /// + /// struct Person<'a> { + /// name: &'a str, + /// } + /// + /// pub fn mixing_hidden_with_elided(v: Person) -> Person<'_> { + /// v + /// } + /// + /// struct Foo; + /// + /// impl Foo { + /// // Lifetime elision results in the output lifetime becoming + /// // `'static`, which is not what was intended. + /// pub fn get_mut(&'static self, x: &mut u8) -> &mut u8 { + /// unsafe { &mut *(x as *mut _) } + /// } + /// } + /// ``` + /// + /// {{produces}} + /// + /// ### Explanation + /// + /// Lifetime elision is useful because it frees you from having to + /// give each lifetime its own name and show the relation of input + /// and output lifetimes for common cases. However, a lifetime + /// that uses inconsistent syntax between related arguments and + /// return values is more confusing. + /// + /// In certain `unsafe` code, lifetime elision combined with + /// inconsistent lifetime syntax may result in unsound code. + pub MISMATCHED_LIFETIME_SYNTAXES, + Warn, + "detects when a lifetime uses different syntax between arguments and return values" +} + +declare_lint_pass!(LifetimeSyntax => [MISMATCHED_LIFETIME_SYNTAXES]); + +impl<'tcx> LateLintPass<'tcx> for LifetimeSyntax { + #[instrument(skip_all)] + fn check_fn( + &mut self, + cx: &LateContext<'tcx>, + _: hir::intravisit::FnKind<'tcx>, + fd: &'tcx hir::FnDecl<'tcx>, + _: &'tcx hir::Body<'tcx>, + _: rustc_span::Span, + _: rustc_span::def_id::LocalDefId, + ) { + let mut input_map = Default::default(); + let mut output_map = Default::default(); + + for input in fd.inputs { + LifetimeInfoCollector::collect(input, &mut input_map); + } + + if let hir::FnRetTy::Return(output) = fd.output { + LifetimeInfoCollector::collect(output, &mut output_map); + } + + report_mismatches(cx, &input_map, &output_map); + } +} + +#[instrument(skip_all)] +fn report_mismatches<'tcx>( + cx: &LateContext<'tcx>, + inputs: &LifetimeInfoMap<'tcx>, + outputs: &LifetimeInfoMap<'tcx>, +) { + for (resolved_lifetime, output_info) in outputs { + if let Some(input_info) = inputs.get(resolved_lifetime) { + if !lifetimes_use_matched_syntax(input_info, output_info) { + emit_mismatch_diagnostic(cx, input_info, output_info); + } + } + } +} + +fn lifetimes_use_matched_syntax(input_info: &[Info<'_>], output_info: &[Info<'_>]) -> bool { + // Categorize lifetimes into source/syntax buckets. + let mut n_hidden = 0; + let mut n_elided = 0; + let mut n_named = 0; + + for info in input_info.iter().chain(output_info) { + use LifetimeSource::*; + use hir::LifetimeSyntax::*; + + let syntax_source = (info.lifetime.syntax, info.lifetime.source); + + match syntax_source { + // Ignore any other kind of lifetime. + (_, Other) => continue, + + // E.g. `&T`. + (Implicit, Reference | OutlivesBound | PreciseCapturing) | + // E.g. `&'_ T`. + (ExplicitAnonymous, Reference | OutlivesBound | PreciseCapturing) | + // E.g. `ContainsLifetime<'_>`. + (ExplicitAnonymous, Path { .. }) => n_elided += 1, + + // E.g. `ContainsLifetime`. + (Implicit, Path { .. }) => n_hidden += 1, + + // E.g. `&'a T`. + (ExplicitBound, Reference | OutlivesBound | PreciseCapturing) | + // E.g. `ContainsLifetime<'a>`. + (ExplicitBound, Path { .. }) => n_named += 1, + }; + } + + let syntax_counts = (n_hidden, n_elided, n_named); + tracing::debug!(?syntax_counts); + + matches!(syntax_counts, (_, 0, 0) | (0, _, 0) | (0, 0, _)) +} + +fn emit_mismatch_diagnostic<'tcx>( + cx: &LateContext<'tcx>, + input_info: &[Info<'_>], + output_info: &[Info<'_>], +) { + // There can only ever be zero or one bound lifetime + // for a given lifetime resolution. + let mut bound_lifetime = None; + + // We offer the following kinds of suggestions (when appropriate + // such that the suggestion wouldn't violate the lint): + // + // 1. Every lifetime becomes named, when there is already a + // user-provided name. + // + // 2. A "mixed" signature, where references become implicit + // and paths become explicitly anonymous. + // + // 3. Every lifetime becomes implicit. + // + // 4. Every lifetime becomes explicitly anonymous. + // + // Number 2 is arguably the most common pattern and the one we + // should push strongest. Number 3 is likely the next most common, + // followed by number 1. Coming in at a distant last would be + // number 4. + // + // Beyond these, there are variants of acceptable signatures that + // we won't suggest because they are very low-value. For example, + // we will never suggest `fn(&T1, &'_ T2) -> &T3` even though that + // would pass the lint. + // + // The following collections are the lifetime instances that we + // suggest changing to a given alternate style. + + // 1. Convert all to named. + let mut suggest_change_to_explicit_bound = Vec::new(); + + // 2. Convert to mixed. We track each kind of change separately. + let mut suggest_change_to_mixed_implicit = Vec::new(); + let mut suggest_change_to_mixed_explicit_anonymous = Vec::new(); + + // 3. Convert all to implicit. + let mut suggest_change_to_implicit = Vec::new(); + + // 4. Convert all to explicit anonymous. + let mut suggest_change_to_explicit_anonymous = Vec::new(); + + // Some styles prevent using implicit syntax at all. + let mut allow_suggesting_implicit = true; + + // It only makes sense to suggest mixed if we have both sources. + let mut saw_a_reference = false; + let mut saw_a_path = false; + + for info in input_info.iter().chain(output_info) { + use LifetimeSource::*; + use hir::LifetimeSyntax::*; + + let syntax_source = (info.lifetime.syntax, info.lifetime.source); + + if let (_, Other) = syntax_source { + // Ignore any other kind of lifetime. + continue; + } + + if let (ExplicitBound, _) = syntax_source { + bound_lifetime = Some(info); + } + + match syntax_source { + // E.g. `&T`. + (Implicit, Reference) => { + suggest_change_to_explicit_anonymous.push(info); + suggest_change_to_explicit_bound.push(info); + } + + // E.g. `&'_ T`. + (ExplicitAnonymous, Reference) => { + suggest_change_to_implicit.push(info); + suggest_change_to_mixed_implicit.push(info); + suggest_change_to_explicit_bound.push(info); + } + + // E.g. `ContainsLifetime`. + (Implicit, Path { .. }) => { + suggest_change_to_mixed_explicit_anonymous.push(info); + suggest_change_to_explicit_anonymous.push(info); + suggest_change_to_explicit_bound.push(info); + } + + // E.g. `ContainsLifetime<'_>`. + (ExplicitAnonymous, Path { .. }) => { + suggest_change_to_explicit_bound.push(info); + } + + // E.g. `&'a T`. + (ExplicitBound, Reference) => { + suggest_change_to_implicit.push(info); + suggest_change_to_mixed_implicit.push(info); + suggest_change_to_explicit_anonymous.push(info); + } + + // E.g. `ContainsLifetime<'a>`. + (ExplicitBound, Path { .. }) => { + suggest_change_to_mixed_explicit_anonymous.push(info); + suggest_change_to_explicit_anonymous.push(info); + } + + (Implicit, OutlivesBound | PreciseCapturing) => { + panic!("This syntax / source combination is not possible"); + } + + // E.g. `+ '_`, `+ use<'_>`. + (ExplicitAnonymous, OutlivesBound | PreciseCapturing) => { + suggest_change_to_explicit_bound.push(info); + } + + // E.g. `+ 'a`, `+ use<'a>`. + (ExplicitBound, OutlivesBound | PreciseCapturing) => { + suggest_change_to_mixed_explicit_anonymous.push(info); + suggest_change_to_explicit_anonymous.push(info); + } + + (_, Other) => { + panic!("This syntax / source combination has already been skipped"); + } + } + + if matches!(syntax_source, (_, Path { .. } | OutlivesBound | PreciseCapturing)) { + allow_suggesting_implicit = false; + } + + match syntax_source { + (_, Reference) => saw_a_reference = true, + (_, Path { .. }) => saw_a_path = true, + _ => {} + } + } + + let make_implicit_suggestions = + |infos: &[&Info<'_>]| infos.iter().map(|i| i.removing_span()).collect::<Vec<_>>(); + + let inputs = input_info.iter().map(|info| info.reporting_span()).collect(); + let outputs = output_info.iter().map(|info| info.reporting_span()).collect(); + + let explicit_bound_suggestion = bound_lifetime.map(|info| { + build_mismatch_suggestion(info.lifetime_name(), &suggest_change_to_explicit_bound) + }); + + let is_bound_static = bound_lifetime.is_some_and(|info| info.is_static()); + + tracing::debug!(?bound_lifetime, ?explicit_bound_suggestion, ?is_bound_static); + + let should_suggest_mixed = + // Do we have a mixed case? + (saw_a_reference && saw_a_path) && + // Is there anything to change? + (!suggest_change_to_mixed_implicit.is_empty() || + !suggest_change_to_mixed_explicit_anonymous.is_empty()) && + // If we have `'static`, we don't want to remove it. + !is_bound_static; + + let mixed_suggestion = should_suggest_mixed.then(|| { + let implicit_suggestions = make_implicit_suggestions(&suggest_change_to_mixed_implicit); + + let explicit_anonymous_suggestions = suggest_change_to_mixed_explicit_anonymous + .iter() + .map(|info| info.suggestion("'_")) + .collect(); + + lints::MismatchedLifetimeSyntaxesSuggestion::Mixed { + implicit_suggestions, + explicit_anonymous_suggestions, + tool_only: false, + } + }); + + tracing::debug!( + ?suggest_change_to_mixed_implicit, + ?suggest_change_to_mixed_explicit_anonymous, + ?mixed_suggestion, + ); + + let should_suggest_implicit = + // Is there anything to change? + !suggest_change_to_implicit.is_empty() && + // We never want to hide the lifetime in a path (or similar). + allow_suggesting_implicit && + // If we have `'static`, we don't want to remove it. + !is_bound_static; + + let implicit_suggestion = should_suggest_implicit.then(|| { + let suggestions = make_implicit_suggestions(&suggest_change_to_implicit); + + lints::MismatchedLifetimeSyntaxesSuggestion::Implicit { suggestions, tool_only: false } + }); + + tracing::debug!( + ?should_suggest_implicit, + ?suggest_change_to_implicit, + allow_suggesting_implicit, + ?implicit_suggestion, + ); + + let should_suggest_explicit_anonymous = + // Is there anything to change? + !suggest_change_to_explicit_anonymous.is_empty() && + // If we have `'static`, we don't want to remove it. + !is_bound_static; + + let explicit_anonymous_suggestion = should_suggest_explicit_anonymous + .then(|| build_mismatch_suggestion("'_", &suggest_change_to_explicit_anonymous)); + + tracing::debug!( + ?should_suggest_explicit_anonymous, + ?suggest_change_to_explicit_anonymous, + ?explicit_anonymous_suggestion, + ); + + let lifetime_name = bound_lifetime.map(|info| info.lifetime_name()).unwrap_or("'_").to_owned(); + + // We can produce a number of suggestions which may overwhelm + // the user. Instead, we order the suggestions based on Rust + // idioms. The "best" choice is shown to the user and the + // remaining choices are shown to tools only. + let mut suggestions = Vec::new(); + suggestions.extend(explicit_bound_suggestion); + suggestions.extend(mixed_suggestion); + suggestions.extend(implicit_suggestion); + suggestions.extend(explicit_anonymous_suggestion); + + cx.emit_span_lint( + MISMATCHED_LIFETIME_SYNTAXES, + Vec::clone(&inputs), + lints::MismatchedLifetimeSyntaxes { lifetime_name, inputs, outputs, suggestions }, + ); +} + +fn build_mismatch_suggestion( + lifetime_name: &str, + infos: &[&Info<'_>], +) -> lints::MismatchedLifetimeSyntaxesSuggestion { + let lifetime_name = lifetime_name.to_owned(); + + let suggestions = infos.iter().map(|info| info.suggestion(&lifetime_name)).collect(); + + lints::MismatchedLifetimeSyntaxesSuggestion::Explicit { + lifetime_name, + suggestions, + tool_only: false, + } +} + +#[derive(Debug)] +struct Info<'tcx> { + type_span: Span, + referenced_type_span: Option<Span>, + lifetime: &'tcx hir::Lifetime, +} + +impl<'tcx> Info<'tcx> { + fn lifetime_name(&self) -> &str { + self.lifetime.ident.as_str() + } + + fn is_static(&self) -> bool { + self.lifetime.is_static() + } + + /// When reporting a lifetime that is implicit, we expand the span + /// to include the type. Otherwise we end up pointing at nothing, + /// which is a bit confusing. + fn reporting_span(&self) -> Span { + if self.lifetime.is_implicit() { self.type_span } else { self.lifetime.ident.span } + } + + /// When removing an explicit lifetime from a reference, + /// we want to remove the whitespace after the lifetime. + /// + /// ```rust + /// fn x(a: &'_ u8) {} + /// ``` + /// + /// Should become: + /// + /// ```rust + /// fn x(a: &u8) {} + /// ``` + // FIXME: Ideally, we'd also remove the lifetime declaration. + fn removing_span(&self) -> Span { + let mut span = self.suggestion("'dummy").0; + + if let Some(referenced_type_span) = self.referenced_type_span { + span = span.until(referenced_type_span); + } + + span + } + + fn suggestion(&self, lifetime_name: &str) -> (Span, String) { + self.lifetime.suggestion(lifetime_name) + } +} + +type LifetimeInfoMap<'tcx> = FxIndexMap<&'tcx hir::LifetimeKind, Vec<Info<'tcx>>>; + +struct LifetimeInfoCollector<'a, 'tcx> { + type_span: Span, + referenced_type_span: Option<Span>, + map: &'a mut LifetimeInfoMap<'tcx>, +} + +impl<'a, 'tcx> LifetimeInfoCollector<'a, 'tcx> { + fn collect(ty: &'tcx hir::Ty<'tcx>, map: &'a mut LifetimeInfoMap<'tcx>) { + let mut this = Self { type_span: ty.span, referenced_type_span: None, map }; + + intravisit::walk_unambig_ty(&mut this, ty); + } +} + +impl<'a, 'tcx> Visitor<'tcx> for LifetimeInfoCollector<'a, 'tcx> { + #[instrument(skip(self))] + fn visit_lifetime(&mut self, lifetime: &'tcx hir::Lifetime) { + let type_span = self.type_span; + let referenced_type_span = self.referenced_type_span; + + let info = Info { type_span, referenced_type_span, lifetime }; + + self.map.entry(&lifetime.kind).or_default().push(info); + } + + #[instrument(skip(self))] + fn visit_ty(&mut self, ty: &'tcx hir::Ty<'tcx, hir::AmbigArg>) -> Self::Result { + let old_type_span = self.type_span; + let old_referenced_type_span = self.referenced_type_span; + + self.type_span = ty.span; + if let hir::TyKind::Ref(_, ty) = ty.kind { + self.referenced_type_span = Some(ty.ty.span); + } + + intravisit::walk_ty(self, ty); + + self.type_span = old_type_span; + self.referenced_type_span = old_referenced_type_span; + } +} diff --git a/compiler/rustc_lint/src/lints.rs b/compiler/rustc_lint/src/lints.rs index 7268a7f704f..9d3c74a9a2b 100644 --- a/compiler/rustc_lint/src/lints.rs +++ b/compiler/rustc_lint/src/lints.rs @@ -8,17 +8,17 @@ use rustc_errors::{ Applicability, Diag, DiagArgValue, DiagMessage, DiagStyledString, ElidedLifetimeInPathSubdiag, EmissionGuarantee, LintDiagnostic, MultiSpan, Subdiagnostic, SuggestionStyle, }; +use rustc_hir as hir; use rustc_hir::def::Namespace; use rustc_hir::def_id::DefId; use rustc_hir::intravisit::VisitorExt; -use rustc_hir::{self as hir, MissingLifetimeKind}; use rustc_macros::{LintDiagnostic, Subdiagnostic}; use rustc_middle::ty::inhabitedness::InhabitedPredicate; use rustc_middle::ty::{Clause, PolyExistentialTraitRef, Ty, TyCtxt}; use rustc_session::Session; use rustc_session::lint::AmbiguityErrorDiag; use rustc_span::edition::Edition; -use rustc_span::{Ident, MacroRulesNormalizedIdent, Span, Symbol, kw, sym}; +use rustc_span::{Ident, MacroRulesNormalizedIdent, Span, Symbol, sym}; use crate::builtin::{InitError, ShorthandAssocTyCollector, TypeAliasBounds}; use crate::errors::{OverruledAttributeSub, RequestedLevel}; @@ -1782,13 +1782,20 @@ pub(crate) enum InvalidNanComparisonsSuggestion { #[derive(LintDiagnostic)] pub(crate) enum AmbiguousWidePointerComparisons<'a> { #[diag(lint_ambiguous_wide_pointer_comparisons)] - Spanful { + SpanfulEq { #[subdiagnostic] addr_suggestion: AmbiguousWidePointerComparisonsAddrSuggestion<'a>, #[subdiagnostic] addr_metadata_suggestion: Option<AmbiguousWidePointerComparisonsAddrMetadataSuggestion<'a>>, }, #[diag(lint_ambiguous_wide_pointer_comparisons)] + SpanfulCmp { + #[subdiagnostic] + cast_suggestion: AmbiguousWidePointerComparisonsCastSuggestion<'a>, + #[subdiagnostic] + expect_suggestion: AmbiguousWidePointerComparisonsExpectSuggestion<'a>, + }, + #[diag(lint_ambiguous_wide_pointer_comparisons)] #[help(lint_addr_metadata_suggestion)] #[help(lint_addr_suggestion)] Spanless, @@ -1816,48 +1823,67 @@ pub(crate) struct AmbiguousWidePointerComparisonsAddrMetadataSuggestion<'a> { } #[derive(Subdiagnostic)] -pub(crate) enum AmbiguousWidePointerComparisonsAddrSuggestion<'a> { - #[multipart_suggestion( - lint_addr_suggestion, - style = "verbose", - // FIXME(#53934): make machine-applicable again - applicability = "maybe-incorrect" - )] - AddrEq { - ne: &'a str, - deref_left: &'a str, - deref_right: &'a str, - l_modifiers: &'a str, - r_modifiers: &'a str, - #[suggestion_part(code = "{ne}std::ptr::addr_eq({deref_left}")] - left: Span, - #[suggestion_part(code = "{l_modifiers}, {deref_right}")] - middle: Span, - #[suggestion_part(code = "{r_modifiers})")] - right: Span, - }, - #[multipart_suggestion( - lint_addr_suggestion, - style = "verbose", - // FIXME(#53934): make machine-applicable again - applicability = "maybe-incorrect" +#[multipart_suggestion( + lint_addr_suggestion, + style = "verbose", + // FIXME(#53934): make machine-applicable again + applicability = "maybe-incorrect" +)] +pub(crate) struct AmbiguousWidePointerComparisonsAddrSuggestion<'a> { + pub(crate) ne: &'a str, + pub(crate) deref_left: &'a str, + pub(crate) deref_right: &'a str, + pub(crate) l_modifiers: &'a str, + pub(crate) r_modifiers: &'a str, + #[suggestion_part(code = "{ne}std::ptr::addr_eq({deref_left}")] + pub(crate) left: Span, + #[suggestion_part(code = "{l_modifiers}, {deref_right}")] + pub(crate) middle: Span, + #[suggestion_part(code = "{r_modifiers})")] + pub(crate) right: Span, +} + +#[derive(Subdiagnostic)] +#[multipart_suggestion( + lint_cast_suggestion, + style = "verbose", + // FIXME(#53934): make machine-applicable again + applicability = "maybe-incorrect" +)] +pub(crate) struct AmbiguousWidePointerComparisonsCastSuggestion<'a> { + pub(crate) deref_left: &'a str, + pub(crate) deref_right: &'a str, + pub(crate) paren_left: &'a str, + pub(crate) paren_right: &'a str, + pub(crate) l_modifiers: &'a str, + pub(crate) r_modifiers: &'a str, + #[suggestion_part(code = "({deref_left}")] + pub(crate) left_before: Option<Span>, + #[suggestion_part(code = "{l_modifiers}{paren_left}.cast::<()>()")] + pub(crate) left_after: Span, + #[suggestion_part(code = "({deref_right}")] + pub(crate) right_before: Option<Span>, + #[suggestion_part(code = "{r_modifiers}{paren_right}.cast::<()>()")] + pub(crate) right_after: Span, +} + +#[derive(Subdiagnostic)] +#[multipart_suggestion( + lint_expect_suggestion, + style = "verbose", + // FIXME(#53934): make machine-applicable again + applicability = "maybe-incorrect" +)] +pub(crate) struct AmbiguousWidePointerComparisonsExpectSuggestion<'a> { + pub(crate) paren_left: &'a str, + pub(crate) paren_right: &'a str, + // FIXME(#127436): Adjust once resolved + #[suggestion_part( + code = r#"{{ #[expect(ambiguous_wide_pointer_comparisons, reason = "...")] {paren_left}"# )] - Cast { - deref_left: &'a str, - deref_right: &'a str, - paren_left: &'a str, - paren_right: &'a str, - l_modifiers: &'a str, - r_modifiers: &'a str, - #[suggestion_part(code = "({deref_left}")] - left_before: Option<Span>, - #[suggestion_part(code = "{l_modifiers}{paren_left}.cast::<()>()")] - left_after: Span, - #[suggestion_part(code = "({deref_right}")] - right_before: Option<Span>, - #[suggestion_part(code = "{r_modifiers}{paren_right}.cast::<()>()")] - right_after: Span, - }, + pub(crate) before: Span, + #[suggestion_part(code = "{paren_right} }}")] + pub(crate) after: Span, } #[derive(LintDiagnostic)] @@ -2273,6 +2299,16 @@ pub(crate) mod unexpected_cfg_name { pub(crate) enum CodeSuggestion { #[help(lint_unexpected_cfg_define_features)] DefineFeatures, + #[multipart_suggestion( + lint_unexpected_cfg_name_version_syntax, + applicability = "machine-applicable" + )] + VersionSyntax { + #[suggestion_part(code = "(")] + between_name_and_value: Span, + #[suggestion_part(code = ")")] + after_value: Span, + }, #[suggestion( lint_unexpected_cfg_name_similar_name_value, applicability = "maybe-incorrect", @@ -2716,58 +2752,6 @@ pub(crate) struct ElidedLifetimesInPaths { pub subdiag: ElidedLifetimeInPathSubdiag, } -pub(crate) struct ElidedNamedLifetime { - pub span: Span, - pub kind: MissingLifetimeKind, - pub name: Symbol, - pub declaration: Option<Span>, -} - -impl<G: EmissionGuarantee> LintDiagnostic<'_, G> for ElidedNamedLifetime { - fn decorate_lint(self, diag: &mut rustc_errors::Diag<'_, G>) { - let Self { span, kind, name, declaration } = self; - diag.primary_message(fluent::lint_elided_named_lifetime); - diag.arg("name", name); - diag.span_label(span, fluent::lint_label_elided); - if let Some(declaration) = declaration { - diag.span_label(declaration, fluent::lint_label_named); - } - // FIXME(GrigorenkoPV): this `if` and `return` should be removed, - // but currently this lint's suggestions can conflict with those of `clippy::needless_lifetimes`: - // https://github.com/rust-lang/rust/pull/129840#issuecomment-2323349119 - // HACK: `'static` suggestions will never sonflict, emit only those for now. - if name != kw::StaticLifetime { - return; - } - match kind { - MissingLifetimeKind::Underscore => diag.span_suggestion_verbose( - span, - fluent::lint_suggestion, - format!("{name}"), - Applicability::MachineApplicable, - ), - MissingLifetimeKind::Ampersand => diag.span_suggestion_verbose( - span.shrink_to_hi(), - fluent::lint_suggestion, - format!("{name} "), - Applicability::MachineApplicable, - ), - MissingLifetimeKind::Comma => diag.span_suggestion_verbose( - span.shrink_to_hi(), - fluent::lint_suggestion, - format!("{name}, "), - Applicability::MachineApplicable, - ), - MissingLifetimeKind::Brackets => diag.span_suggestion_verbose( - span.shrink_to_hi(), - fluent::lint_suggestion, - format!("<{name}>"), - Applicability::MachineApplicable, - ), - }; - } -} - #[derive(LintDiagnostic)] #[diag(lint_invalid_crate_type_value)] pub(crate) struct UnknownCrateTypes { @@ -3041,7 +3025,9 @@ pub(crate) struct ByteSliceInPackedStructWithDerive { #[derive(LintDiagnostic)] #[diag(lint_unused_extern_crate)] pub(crate) struct UnusedExternCrate { - #[suggestion(code = "", applicability = "machine-applicable")] + #[label] + pub span: Span, + #[suggestion(code = "", applicability = "machine-applicable", style = "verbose")] pub removal_span: Span, } @@ -3203,3 +3189,128 @@ pub(crate) struct ReservedMultihash { #[suggestion(code = " ", applicability = "machine-applicable")] pub suggestion: Span, } + +#[derive(Debug)] +pub(crate) struct MismatchedLifetimeSyntaxes { + pub lifetime_name: String, + pub inputs: Vec<Span>, + pub outputs: Vec<Span>, + + pub suggestions: Vec<MismatchedLifetimeSyntaxesSuggestion>, +} + +impl<'a, G: EmissionGuarantee> LintDiagnostic<'a, G> for MismatchedLifetimeSyntaxes { + fn decorate_lint<'b>(self, diag: &'b mut Diag<'a, G>) { + diag.primary_message(fluent::lint_mismatched_lifetime_syntaxes); + + diag.arg("lifetime_name", self.lifetime_name); + + diag.arg("n_inputs", self.inputs.len()); + for input in self.inputs { + let a = diag.eagerly_translate(fluent::lint_label_mismatched_lifetime_syntaxes_inputs); + diag.span_label(input, a); + } + + diag.arg("n_outputs", self.outputs.len()); + for output in self.outputs { + let a = diag.eagerly_translate(fluent::lint_label_mismatched_lifetime_syntaxes_outputs); + diag.span_label(output, a); + } + + let mut suggestions = self.suggestions.into_iter(); + if let Some(s) = suggestions.next() { + diag.subdiagnostic(s); + + for mut s in suggestions { + s.make_tool_only(); + diag.subdiagnostic(s); + } + } + } +} + +#[derive(Debug)] +pub(crate) enum MismatchedLifetimeSyntaxesSuggestion { + Implicit { + suggestions: Vec<Span>, + tool_only: bool, + }, + + Mixed { + implicit_suggestions: Vec<Span>, + explicit_anonymous_suggestions: Vec<(Span, String)>, + tool_only: bool, + }, + + Explicit { + lifetime_name: String, + suggestions: Vec<(Span, String)>, + tool_only: bool, + }, +} + +impl MismatchedLifetimeSyntaxesSuggestion { + fn make_tool_only(&mut self) { + use MismatchedLifetimeSyntaxesSuggestion::*; + + let tool_only = match self { + Implicit { tool_only, .. } | Mixed { tool_only, .. } | Explicit { tool_only, .. } => { + tool_only + } + }; + + *tool_only = true; + } +} + +impl Subdiagnostic for MismatchedLifetimeSyntaxesSuggestion { + fn add_to_diag<G: EmissionGuarantee>(self, diag: &mut Diag<'_, G>) { + use MismatchedLifetimeSyntaxesSuggestion::*; + + let style = |tool_only| { + if tool_only { SuggestionStyle::CompletelyHidden } else { SuggestionStyle::ShowAlways } + }; + + match self { + Implicit { suggestions, tool_only } => { + let suggestions = suggestions.into_iter().map(|s| (s, String::new())).collect(); + diag.multipart_suggestion_with_style( + fluent::lint_mismatched_lifetime_syntaxes_suggestion_implicit, + suggestions, + Applicability::MachineApplicable, + style(tool_only), + ); + } + + Mixed { implicit_suggestions, explicit_anonymous_suggestions, tool_only } => { + let implicit_suggestions = + implicit_suggestions.into_iter().map(|s| (s, String::new())); + + let suggestions = + implicit_suggestions.chain(explicit_anonymous_suggestions).collect(); + + diag.multipart_suggestion_with_style( + fluent::lint_mismatched_lifetime_syntaxes_suggestion_mixed, + suggestions, + Applicability::MachineApplicable, + style(tool_only), + ); + } + + Explicit { lifetime_name, suggestions, tool_only } => { + diag.arg("lifetime_name", lifetime_name); + + let msg = diag.eagerly_translate( + fluent::lint_mismatched_lifetime_syntaxes_suggestion_explicit, + ); + + diag.multipart_suggestion_with_style( + msg, + suggestions, + Applicability::MachineApplicable, + style(tool_only), + ); + } + } + } +} diff --git a/compiler/rustc_lint/src/non_local_def.rs b/compiler/rustc_lint/src/non_local_def.rs index 9ed11d9cc82..b877f909fc0 100644 --- a/compiler/rustc_lint/src/non_local_def.rs +++ b/compiler/rustc_lint/src/non_local_def.rs @@ -183,7 +183,7 @@ impl<'tcx> LateLintPass<'tcx> for NonLocalDefinitions { && parent_opt_item_name != Some(kw::Underscore) && let Some(parent) = parent.as_local() && let Node::Item(item) = cx.tcx.hir_node_by_def_id(parent) - && let ItemKind::Const(ident, ty, _, _) = item.kind + && let ItemKind::Const(ident, _, ty, _) = item.kind && let TyKind::Tup(&[]) = ty.kind { Some(ident.span) diff --git a/compiler/rustc_lint/src/nonstandard_style.rs b/compiler/rustc_lint/src/nonstandard_style.rs index 048d377b78f..31c18074466 100644 --- a/compiler/rustc_lint/src/nonstandard_style.rs +++ b/compiler/rustc_lint/src/nonstandard_style.rs @@ -513,7 +513,7 @@ impl<'tcx> LateLintPass<'tcx> for NonUpperCaseGlobals { fn check_item(&mut self, cx: &LateContext<'_>, it: &hir::Item<'_>) { let attrs = cx.tcx.hir_attrs(it.hir_id()); match it.kind { - hir::ItemKind::Static(ident, ..) + hir::ItemKind::Static(_, ident, ..) if !ast::attr::contains_name(attrs, sym::no_mangle) => { NonUpperCaseGlobals::check_upper_case(cx, "static variable", &ident); diff --git a/compiler/rustc_lint/src/transmute.rs b/compiler/rustc_lint/src/transmute.rs new file mode 100644 index 00000000000..bc1d4587d07 --- /dev/null +++ b/compiler/rustc_lint/src/transmute.rs @@ -0,0 +1,278 @@ +use rustc_errors::Applicability; +use rustc_hir::def::{DefKind, Res}; +use rustc_hir::def_id::LocalDefId; +use rustc_hir::{self as hir}; +use rustc_macros::LintDiagnostic; +use rustc_middle::ty::{self, Ty}; +use rustc_session::{declare_lint, impl_lint_pass}; +use rustc_span::sym; + +use crate::{LateContext, LateLintPass}; + +declare_lint! { + /// The `ptr_to_integer_transmute_in_consts` lint detects pointer to integer + /// transmute in const functions and associated constants. + /// + /// ### Example + /// + /// ```rust + /// const fn foo(ptr: *const u8) -> usize { + /// unsafe { + /// std::mem::transmute::<*const u8, usize>(ptr) + /// } + /// } + /// ``` + /// + /// {{produces}} + /// + /// ### Explanation + /// + /// Transmuting pointers to integers in a `const` context is undefined behavior. + /// Any attempt to use the resulting integer will abort const-evaluation. + /// + /// But sometimes the compiler might not emit an error for pointer to integer transmutes + /// inside const functions and associated consts because they are evaluated only when referenced. + /// Therefore, this lint serves as an extra layer of defense to prevent any undefined behavior + /// from compiling without any warnings or errors. + /// + /// See [std::mem::transmute] in the reference for more details. + /// + /// [std::mem::transmute]: https://doc.rust-lang.org/std/mem/fn.transmute.html + pub PTR_TO_INTEGER_TRANSMUTE_IN_CONSTS, + Warn, + "detects pointer to integer transmutes in const functions and associated constants", +} + +declare_lint! { + /// The `unnecessary_transmutes` lint detects transmutations that have safer alternatives. + /// + /// ### Example + /// + /// ```rust + /// fn bytes_at_home(x: [u8; 4]) -> u32 { + /// unsafe { std::mem::transmute(x) } + /// } + /// ``` + /// + /// {{produces}} + /// + /// ### Explanation + /// + /// Using an explicit method is preferable over calls to + /// [`transmute`](https://doc.rust-lang.org/std/mem/fn.transmute.html) as + /// they more clearly communicate the intent, are easier to review, and + /// are less likely to accidentally result in unsoundness. + pub UNNECESSARY_TRANSMUTES, + Warn, + "detects transmutes that can also be achieved by other operations" +} + +pub(crate) struct CheckTransmutes; + +impl_lint_pass!(CheckTransmutes => [PTR_TO_INTEGER_TRANSMUTE_IN_CONSTS, UNNECESSARY_TRANSMUTES]); + +impl<'tcx> LateLintPass<'tcx> for CheckTransmutes { + fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'tcx>) { + let hir::ExprKind::Call(callee, [arg]) = expr.kind else { + return; + }; + let hir::ExprKind::Path(qpath) = callee.kind else { + return; + }; + let Res::Def(DefKind::Fn, def_id) = cx.qpath_res(&qpath, callee.hir_id) else { + return; + }; + if !cx.tcx.is_intrinsic(def_id, sym::transmute) { + return; + }; + let body_owner_def_id = cx.tcx.hir_enclosing_body_owner(expr.hir_id); + let const_context = cx.tcx.hir_body_const_context(body_owner_def_id); + let args = cx.typeck_results().node_args(callee.hir_id); + + let src = args.type_at(0); + let dst = args.type_at(1); + + check_ptr_transmute_in_const(cx, expr, body_owner_def_id, const_context, src, dst); + check_unnecessary_transmute(cx, expr, callee, arg, const_context, src, dst); + } +} + +/// Check for transmutes that exhibit undefined behavior. +/// For example, transmuting pointers to integers in a const context. +/// +/// Why do we consider const functions and associated constants only? +/// +/// Generally, undefined behavior in const items are handled by the evaluator. +/// But, const functions and associated constants are evaluated only when referenced. +/// This can result in undefined behavior in a library going unnoticed until +/// the function or constant is actually used. +/// +/// Therefore, we only consider const functions and associated constants here and leave +/// other const items to be handled by the evaluator. +fn check_ptr_transmute_in_const<'tcx>( + cx: &LateContext<'tcx>, + expr: &'tcx hir::Expr<'tcx>, + body_owner_def_id: LocalDefId, + const_context: Option<hir::ConstContext>, + src: Ty<'tcx>, + dst: Ty<'tcx>, +) { + if matches!(const_context, Some(hir::ConstContext::ConstFn)) + || matches!(cx.tcx.def_kind(body_owner_def_id), DefKind::AssocConst) + { + if src.is_raw_ptr() && dst.is_integral() { + cx.tcx.emit_node_span_lint( + PTR_TO_INTEGER_TRANSMUTE_IN_CONSTS, + expr.hir_id, + expr.span, + UndefinedTransmuteLint, + ); + } + } +} + +/// Check for transmutes that overlap with stdlib methods. +/// For example, transmuting `[u8; 4]` to `u32`. +/// +/// We chose not to lint u8 -> bool transmutes, see #140431. +fn check_unnecessary_transmute<'tcx>( + cx: &LateContext<'tcx>, + expr: &'tcx hir::Expr<'tcx>, + callee: &'tcx hir::Expr<'tcx>, + arg: &'tcx hir::Expr<'tcx>, + const_context: Option<hir::ConstContext>, + src: Ty<'tcx>, + dst: Ty<'tcx>, +) { + let callee_span = callee.span.find_ancestor_inside(expr.span).unwrap_or(callee.span); + let (sugg, help) = match (src.kind(), dst.kind()) { + // dont check the length; transmute does that for us. + // [u8; _] => primitive + (ty::Array(t, _), ty::Uint(_) | ty::Float(_) | ty::Int(_)) + if *t.kind() == ty::Uint(ty::UintTy::U8) => + { + ( + Some(vec![(callee_span, format!("{dst}::from_ne_bytes"))]), + Some( + "there's also `from_le_bytes` and `from_be_bytes` if you expect a particular byte order", + ), + ) + } + // primitive => [u8; _] + (ty::Uint(_) | ty::Float(_) | ty::Int(_), ty::Array(t, _)) + if *t.kind() == ty::Uint(ty::UintTy::U8) => + { + ( + Some(vec![(callee_span, format!("{src}::to_ne_bytes"))]), + Some( + "there's also `to_le_bytes` and `to_be_bytes` if you expect a particular byte order", + ), + ) + } + // char → u32 + (ty::Char, ty::Uint(ty::UintTy::U32)) => { + (Some(vec![(callee_span, "u32::from".to_string())]), None) + } + // char (→ u32) → i32 + (ty::Char, ty::Int(ty::IntTy::I32)) => ( + Some(vec![ + (callee_span, "u32::from".to_string()), + (expr.span.shrink_to_hi(), ".cast_signed()".to_string()), + ]), + None, + ), + // u32 → char + (ty::Uint(ty::UintTy::U32), ty::Char) => ( + Some(vec![(callee_span, "char::from_u32_unchecked".to_string())]), + Some("consider using `char::from_u32(…).unwrap()`"), + ), + // i32 → char + (ty::Int(ty::IntTy::I32), ty::Char) => ( + Some(vec![ + (callee_span, "char::from_u32_unchecked(i32::cast_unsigned".to_string()), + (expr.span.shrink_to_hi(), ")".to_string()), + ]), + Some("consider using `char::from_u32(i32::cast_unsigned(…)).unwrap()`"), + ), + // uNN → iNN + (ty::Uint(_), ty::Int(_)) => { + (Some(vec![(callee_span, format!("{src}::cast_signed"))]), None) + } + // iNN → uNN + (ty::Int(_), ty::Uint(_)) => { + (Some(vec![(callee_span, format!("{src}::cast_unsigned"))]), None) + } + // fNN → usize, isize + (ty::Float(_), ty::Uint(ty::UintTy::Usize) | ty::Int(ty::IntTy::Isize)) => ( + Some(vec![ + (callee_span, format!("{src}::to_bits")), + (expr.span.shrink_to_hi(), format!(" as {dst}")), + ]), + None, + ), + // fNN (→ uNN) → iNN + (ty::Float(_), ty::Int(..)) => ( + Some(vec![ + (callee_span, format!("{src}::to_bits")), + (expr.span.shrink_to_hi(), ".cast_signed()".to_string()), + ]), + None, + ), + // fNN → uNN + (ty::Float(_), ty::Uint(..)) => { + (Some(vec![(callee_span, format!("{src}::to_bits"))]), None) + } + // xsize → fNN + (ty::Uint(ty::UintTy::Usize) | ty::Int(ty::IntTy::Isize), ty::Float(_)) => ( + Some(vec![ + (callee_span, format!("{dst}::from_bits")), + (arg.span.shrink_to_hi(), " as _".to_string()), + ]), + None, + ), + // iNN (→ uNN) → fNN + (ty::Int(_), ty::Float(_)) => ( + Some(vec![ + (callee_span, format!("{dst}::from_bits({src}::cast_unsigned")), + (expr.span.shrink_to_hi(), ")".to_string()), + ]), + None, + ), + // uNN → fNN + (ty::Uint(_), ty::Float(_)) => { + (Some(vec![(callee_span, format!("{dst}::from_bits"))]), None) + } + // bool → x8 in const context since `From::from` is not const yet + // FIXME: Consider arg expr's precedence to avoid parentheses. + // FIXME(const_traits): Remove this when `From::from` is constified. + (ty::Bool, ty::Int(..) | ty::Uint(..)) if const_context.is_some() => ( + Some(vec![ + (callee_span, "".to_string()), + (expr.span.shrink_to_hi(), format!(" as {dst}")), + ]), + None, + ), + // bool → x8 using `x8::from` + (ty::Bool, ty::Int(..) | ty::Uint(..)) => { + (Some(vec![(callee_span, format!("{dst}::from"))]), None) + } + _ => return, + }; + + cx.tcx.node_span_lint(UNNECESSARY_TRANSMUTES, expr.hir_id, expr.span, |diag| { + diag.primary_message("unnecessary transmute"); + if let Some(sugg) = sugg { + diag.multipart_suggestion("replace this with", sugg, Applicability::MachineApplicable); + } + if let Some(help) = help { + diag.help(help); + } + }); +} + +#[derive(LintDiagnostic)] +#[diag(lint_undefined_transmute)] +#[note] +#[note(lint_note2)] +#[help] +pub(crate) struct UndefinedTransmuteLint; diff --git a/compiler/rustc_lint/src/types.rs b/compiler/rustc_lint/src/types.rs index f1c06dfe6ce..fec23354c91 100644 --- a/compiler/rustc_lint/src/types.rs +++ b/compiler/rustc_lint/src/types.rs @@ -1,9 +1,7 @@ use std::iter; use std::ops::ControlFlow; -use rustc_abi::{ - BackendRepr, Integer, IntegerType, TagEncoding, VariantIdx, Variants, WrappingRange, -}; +use rustc_abi::{BackendRepr, TagEncoding, VariantIdx, Variants, WrappingRange}; use rustc_data_structures::fx::FxHashSet; use rustc_errors::DiagMessage; use rustc_hir::intravisit::VisitorExt; @@ -24,7 +22,8 @@ mod improper_ctypes; use crate::lints::{ AmbiguousWidePointerComparisons, AmbiguousWidePointerComparisonsAddrMetadataSuggestion, - AmbiguousWidePointerComparisonsAddrSuggestion, AtomicOrderingFence, AtomicOrderingLoad, + AmbiguousWidePointerComparisonsAddrSuggestion, AmbiguousWidePointerComparisonsCastSuggestion, + AmbiguousWidePointerComparisonsExpectSuggestion, AtomicOrderingFence, AtomicOrderingLoad, AtomicOrderingStore, ImproperCTypes, InvalidAtomicOrderingDiag, InvalidNanComparisons, InvalidNanComparisonsSuggestion, UnpredictableFunctionPointerComparisons, UnpredictableFunctionPointerComparisonsSuggestion, UnusedComparisons, UsesPowerAlignment, @@ -362,6 +361,7 @@ fn lint_wide_pointer<'tcx>( let ne = if cmpop == ComparisonOp::BinOp(hir::BinOpKind::Ne) { "!" } else { "" }; let is_eq_ne = matches!(cmpop, ComparisonOp::BinOp(hir::BinOpKind::Eq | hir::BinOpKind::Ne)); let is_dyn_comparison = l_inner_ty_is_dyn && r_inner_ty_is_dyn; + let via_method_call = matches!(&e.kind, ExprKind::MethodCall(..) | ExprKind::Call(..)); let left = e.span.shrink_to_lo().until(l_span.shrink_to_lo()); let middle = l_span.shrink_to_hi().until(r_span.shrink_to_lo()); @@ -376,21 +376,21 @@ fn lint_wide_pointer<'tcx>( cx.emit_span_lint( AMBIGUOUS_WIDE_POINTER_COMPARISONS, e.span, - AmbiguousWidePointerComparisons::Spanful { - addr_metadata_suggestion: (is_eq_ne && !is_dyn_comparison).then(|| { - AmbiguousWidePointerComparisonsAddrMetadataSuggestion { - ne, - deref_left, - deref_right, - l_modifiers, - r_modifiers, - left, - middle, - right, - } - }), - addr_suggestion: if is_eq_ne { - AmbiguousWidePointerComparisonsAddrSuggestion::AddrEq { + if is_eq_ne { + AmbiguousWidePointerComparisons::SpanfulEq { + addr_metadata_suggestion: (!is_dyn_comparison).then(|| { + AmbiguousWidePointerComparisonsAddrMetadataSuggestion { + ne, + deref_left, + deref_right, + l_modifiers, + r_modifiers, + left, + middle, + right, + } + }), + addr_suggestion: AmbiguousWidePointerComparisonsAddrSuggestion { ne, deref_left, deref_right, @@ -399,9 +399,11 @@ fn lint_wide_pointer<'tcx>( left, middle, right, - } - } else { - AmbiguousWidePointerComparisonsAddrSuggestion::Cast { + }, + } + } else { + AmbiguousWidePointerComparisons::SpanfulCmp { + cast_suggestion: AmbiguousWidePointerComparisonsCastSuggestion { deref_left, deref_right, l_modifiers, @@ -412,8 +414,14 @@ fn lint_wide_pointer<'tcx>( left_after: l_span.shrink_to_hi(), right_before: (r_ty_refs != 0).then_some(r_span.shrink_to_lo()), right_after: r_span.shrink_to_hi(), - } - }, + }, + expect_suggestion: AmbiguousWidePointerComparisonsExpectSuggestion { + paren_left: if via_method_call { "" } else { "(" }, + paren_right: if via_method_call { "" } else { ")" }, + before: e.span.shrink_to_lo(), + after: e.span.shrink_to_hi(), + }, + } }, ); } @@ -1274,14 +1282,6 @@ impl<'a, 'tcx> ImproperCTypesVisitor<'a, 'tcx> { }; } - if let Some(IntegerType::Fixed(Integer::I128, _)) = def.repr().int { - return FfiUnsafe { - ty, - reason: fluent::lint_improper_ctypes_128bit, - help: None, - }; - } - use improper_ctypes::check_non_exhaustive_variant; let non_exhaustive = def.variant_list_has_applicable_non_exhaustive(); @@ -1314,10 +1314,6 @@ impl<'a, 'tcx> ImproperCTypesVisitor<'a, 'tcx> { // but only the base type is relevant for being representable in FFI. ty::Pat(base, ..) => self.check_type_for_ffi(acc, base), - ty::Int(ty::IntTy::I128) | ty::Uint(ty::UintTy::U128) => { - FfiUnsafe { ty, reason: fluent::lint_improper_ctypes_128bit, help: None } - } - // Primitive types with a stable representation. ty::Bool | ty::Int(..) | ty::Uint(..) | ty::Float(..) | ty::Never => FfiSafe, @@ -1700,7 +1696,7 @@ impl ImproperCTypesDefinitions { && cx.tcx.sess.target.os == "aix" && !adt_def.all_fields().next().is_none() { - let struct_variant_data = item.expect_struct().1; + let struct_variant_data = item.expect_struct().2; for field_def in struct_variant_data.fields().iter().skip(1) { // Struct fields (after the first field) are checked for the // power alignment rule, as fields after the first are likely @@ -1725,9 +1721,9 @@ impl ImproperCTypesDefinitions { impl<'tcx> LateLintPass<'tcx> for ImproperCTypesDefinitions { fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx hir::Item<'tcx>) { match item.kind { - hir::ItemKind::Static(_, ty, ..) - | hir::ItemKind::Const(_, ty, ..) - | hir::ItemKind::TyAlias(_, ty, ..) => { + hir::ItemKind::Static(_, _, ty, _) + | hir::ItemKind::Const(_, _, ty, _) + | hir::ItemKind::TyAlias(_, _, ty) => { self.check_ty_maybe_containing_foreign_fnptr( cx, ty, @@ -1794,7 +1790,7 @@ declare_lint_pass!(VariantSizeDifferences => [VARIANT_SIZE_DIFFERENCES]); impl<'tcx> LateLintPass<'tcx> for VariantSizeDifferences { fn check_item(&mut self, cx: &LateContext<'_>, it: &hir::Item<'_>) { - if let hir::ItemKind::Enum(_, ref enum_definition, _) = it.kind { + if let hir::ItemKind::Enum(_, _, ref enum_definition) = it.kind { let t = cx.tcx.type_of(it.owner_id).instantiate_identity(); let ty = cx.tcx.erase_regions(t); let Ok(layout) = cx.layout_of(ty) else { return }; diff --git a/compiler/rustc_lint/src/unqualified_local_imports.rs b/compiler/rustc_lint/src/unqualified_local_imports.rs index 50c5119285f..0076cae3cff 100644 --- a/compiler/rustc_lint/src/unqualified_local_imports.rs +++ b/compiler/rustc_lint/src/unqualified_local_imports.rs @@ -1,4 +1,3 @@ -use rustc_hir::def::{DefKind, Res}; use rustc_hir::{self as hir}; use rustc_session::{declare_lint, declare_lint_pass}; use rustc_span::kw; @@ -47,17 +46,15 @@ declare_lint_pass!(UnqualifiedLocalImports => [UNQUALIFIED_LOCAL_IMPORTS]); impl<'tcx> LateLintPass<'tcx> for UnqualifiedLocalImports { fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx hir::Item<'tcx>) { let hir::ItemKind::Use(path, _kind) = item.kind else { return }; - // `path` has three resolutions for the type, module, value namespaces. - // Check if any of them qualifies: local crate, and not a macro. - // (Macros can't be imported any other way so we don't complain about them.) - let is_local_import = |res: &Res| { - matches!( - res, - hir::def::Res::Def(def_kind, def_id) - if def_id.is_local() && !matches!(def_kind, DefKind::Macro(_)), - ) - }; - if !path.res.iter().any(is_local_import) { + // Check the type and value namespace resolutions for a local crate. + let is_local_import = matches!( + path.res.type_ns, + Some(hir::def::Res::Def(_, def_id)) if def_id.is_local() + ) || matches!( + path.res.value_ns, + Some(hir::def::Res::Def(_, def_id)) if def_id.is_local() + ); + if !is_local_import { return; } // So this does refer to something local. Let's check whether it starts with `self`, diff --git a/compiler/rustc_lint/src/unused.rs b/compiler/rustc_lint/src/unused.rs index 50a27d7e84f..1620f425794 100644 --- a/compiler/rustc_lint/src/unused.rs +++ b/compiler/rustc_lint/src/unused.rs @@ -1,8 +1,7 @@ use std::iter; -use rustc_ast as ast; use rustc_ast::util::{classify, parser}; -use rustc_ast::{ExprKind, StmtKind}; +use rustc_ast::{self as ast, ExprKind, HasAttrs as _, StmtKind}; use rustc_errors::{MultiSpan, pluralize}; use rustc_hir::def::{DefKind, Res}; use rustc_hir::def_id::DefId; @@ -780,26 +779,30 @@ trait UnusedDelimLint { right_pos: Option<BytePos>, is_kw: bool, ) { - let spans = match value.kind { - ast::ExprKind::Block(ref block, None) if let [stmt] = block.stmts.as_slice() => stmt - .span - .find_ancestor_inside(value.span) - .map(|span| (value.span.with_hi(span.lo()), value.span.with_lo(span.hi()))), + let span_with_attrs = match value.kind { + ast::ExprKind::Block(ref block, None) if let [stmt] = block.stmts.as_slice() => { + // For the statements with attributes, like `{ #[allow()] println!("Hello!") }`, + // the span should contains the attributes, or the suggestion will remove them. + if let Some(attr_lo) = stmt.attrs().iter().map(|attr| attr.span.lo()).min() { + stmt.span.with_lo(attr_lo) + } else { + stmt.span + } + } ast::ExprKind::Paren(ref expr) => { // For the expr with attributes, like `let _ = (#[inline] || println!("Hello!"));`, // the span should contains the attributes, or the suggestion will remove them. - let expr_span_with_attrs = - if let Some(attr_lo) = expr.attrs.iter().map(|attr| attr.span.lo()).min() { - expr.span.with_lo(attr_lo) - } else { - expr.span - }; - expr_span_with_attrs.find_ancestor_inside(value.span).map(|expr_span| { - (value.span.with_hi(expr_span.lo()), value.span.with_lo(expr_span.hi())) - }) + if let Some(attr_lo) = expr.attrs.iter().map(|attr| attr.span.lo()).min() { + expr.span.with_lo(attr_lo) + } else { + expr.span + } } _ => return, }; + let spans = span_with_attrs + .find_ancestor_inside(value.span) + .map(|span| (value.span.with_hi(span.lo()), value.span.with_lo(span.hi()))); let keep_space = ( left_pos.is_some_and(|s| s >= value.span.lo()), right_pos.is_some_and(|s| s <= value.span.hi()), |