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Auto merge of rust-lang#124895 - obeis:static-mut-hidden-ref, r=compi…
…ler-errors Disallow hidden references to mutable static Closes rust-lang#123060 Tracking: - rust-lang#123758
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,154 @@ | ||
| use rustc_hir as hir; | ||
| use rustc_hir::{Expr, Stmt}; | ||
| use rustc_middle::ty::{Mutability, TyKind}; | ||
| use rustc_session::lint::FutureIncompatibilityReason; | ||
| use rustc_session::{declare_lint, declare_lint_pass}; | ||
| use rustc_span::edition::Edition; | ||
| use rustc_span::Span; | ||
|
|
||
| use crate::lints::{MutRefSugg, RefOfMutStatic}; | ||
| use crate::{LateContext, LateLintPass, LintContext}; | ||
|
|
||
| declare_lint! { | ||
| /// The `static_mut_refs` lint checks for shared or mutable references | ||
| /// of mutable static inside `unsafe` blocks and `unsafe` functions. | ||
| /// | ||
| /// ### Example | ||
| /// | ||
| /// ```rust,edition2021 | ||
| /// fn main() { | ||
| /// static mut X: i32 = 23; | ||
| /// static mut Y: i32 = 24; | ||
| /// | ||
| /// unsafe { | ||
| /// let y = &X; | ||
| /// let ref x = X; | ||
| /// let (x, y) = (&X, &Y); | ||
| /// foo(&X); | ||
| /// } | ||
| /// } | ||
| /// | ||
| /// unsafe fn _foo() { | ||
| /// static mut X: i32 = 23; | ||
| /// static mut Y: i32 = 24; | ||
| /// | ||
| /// let y = &X; | ||
| /// let ref x = X; | ||
| /// let (x, y) = (&X, &Y); | ||
| /// foo(&X); | ||
| /// } | ||
| /// | ||
| /// fn foo<'a>(_x: &'a i32) {} | ||
| /// ``` | ||
| /// | ||
| /// {{produces}} | ||
| /// | ||
| /// ### Explanation | ||
| /// | ||
| /// Shared or mutable references of mutable static are almost always a mistake and | ||
| /// can lead to undefined behavior and various other problems in your code. | ||
| /// | ||
| /// This lint is "warn" by default on editions up to 2021, in 2024 is "deny". | ||
| pub STATIC_MUT_REFS, | ||
| Warn, | ||
| "shared references or mutable references of mutable static is discouraged", | ||
| @future_incompatible = FutureIncompatibleInfo { | ||
| reason: FutureIncompatibilityReason::EditionError(Edition::Edition2024), | ||
| reference: "<https://doc.rust-lang.org/nightly/edition-guide/rust-2024/static-mut-references.html>", | ||
| explain_reason: false, | ||
| }; | ||
| @edition Edition2024 => Deny; | ||
| } | ||
|
|
||
| declare_lint_pass!(StaticMutRefs => [STATIC_MUT_REFS]); | ||
|
|
||
| impl<'tcx> LateLintPass<'tcx> for StaticMutRefs { | ||
| #[allow(rustc::usage_of_ty_tykind)] | ||
| fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &Expr<'_>) { | ||
| let err_span = expr.span; | ||
| match expr.kind { | ||
| hir::ExprKind::AddrOf(borrow_kind, m, ex) | ||
| if matches!(borrow_kind, hir::BorrowKind::Ref) | ||
| && let Some(err_span) = path_is_static_mut(ex, err_span) => | ||
| { | ||
| emit_static_mut_refs( | ||
| cx, | ||
| err_span, | ||
| err_span.with_hi(ex.span.lo()), | ||
| m, | ||
| !expr.span.from_expansion(), | ||
| ); | ||
| } | ||
| hir::ExprKind::MethodCall(_, e, _, _) | ||
| if let Some(err_span) = path_is_static_mut(e, expr.span) | ||
| && let typeck = cx.typeck_results() | ||
| && let Some(method_def_id) = typeck.type_dependent_def_id(expr.hir_id) | ||
| && let inputs = | ||
| cx.tcx.fn_sig(method_def_id).skip_binder().inputs().skip_binder() | ||
| && let Some(receiver) = inputs.get(0) | ||
| && let TyKind::Ref(_, _, m) = receiver.kind() => | ||
| { | ||
| emit_static_mut_refs(cx, err_span, err_span.shrink_to_lo(), *m, false); | ||
| } | ||
| _ => {} | ||
| } | ||
| } | ||
|
|
||
| fn check_stmt(&mut self, cx: &LateContext<'tcx>, stmt: &Stmt<'_>) { | ||
| if let hir::StmtKind::Let(loc) = stmt.kind | ||
| && let hir::PatKind::Binding(ba, _, _, _) = loc.pat.kind | ||
| && let hir::ByRef::Yes(m) = ba.0 | ||
| && let Some(init) = loc.init | ||
| && let Some(err_span) = path_is_static_mut(init, init.span) | ||
| { | ||
| emit_static_mut_refs(cx, err_span, err_span.shrink_to_lo(), m, false); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| fn path_is_static_mut(mut expr: &hir::Expr<'_>, mut err_span: Span) -> Option<Span> { | ||
| if err_span.from_expansion() { | ||
| err_span = expr.span; | ||
| } | ||
|
|
||
| while let hir::ExprKind::Field(e, _) = expr.kind { | ||
| expr = e; | ||
| } | ||
|
|
||
| if let hir::ExprKind::Path(qpath) = expr.kind | ||
| && let hir::QPath::Resolved(_, path) = qpath | ||
| && let hir::def::Res::Def(def_kind, _) = path.res | ||
| && let hir::def::DefKind::Static { safety: _, mutability: Mutability::Mut, nested: false } = | ||
| def_kind | ||
| { | ||
| return Some(err_span); | ||
| } | ||
| None | ||
| } | ||
|
|
||
| fn emit_static_mut_refs( | ||
| cx: &LateContext<'_>, | ||
| span: Span, | ||
| sugg_span: Span, | ||
| mutable: Mutability, | ||
| suggest_addr_of: bool, | ||
| ) { | ||
| let (shared_label, shared_note, mut_note, sugg) = match mutable { | ||
| Mutability::Mut => { | ||
| let sugg = | ||
| if suggest_addr_of { Some(MutRefSugg::Mut { span: sugg_span }) } else { None }; | ||
| ("mutable ", false, true, sugg) | ||
| } | ||
| Mutability::Not => { | ||
| let sugg = | ||
| if suggest_addr_of { Some(MutRefSugg::Shared { span: sugg_span }) } else { None }; | ||
| ("shared ", true, false, sugg) | ||
| } | ||
| }; | ||
|
|
||
| cx.emit_span_lint( | ||
| STATIC_MUT_REFS, | ||
| span, | ||
| RefOfMutStatic { span, sugg, shared_label, shared_note, mut_note }, | ||
| ); | ||
| } |
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