diff --git a/compiler/rustc_passes/src/check_attr.rs b/compiler/rustc_passes/src/check_attr.rs index 06184b4797255..8c1d6188e7c82 100644 --- a/compiler/rustc_passes/src/check_attr.rs +++ b/compiler/rustc_passes/src/check_attr.rs @@ -80,6 +80,7 @@ impl CheckAttrVisitor<'_> { self.check_rustc_must_implement_one_of(attr, span, target) } sym::target_feature => self.check_target_feature(hir_id, attr, span, target), + sym::thread_local => self.check_thread_local(attr, span, target), sym::track_caller => { self.check_track_caller(hir_id, attr.span, attrs, span, target) } @@ -521,6 +522,21 @@ impl CheckAttrVisitor<'_> { } } + /// Checks if the `#[thread_local]` attribute on `item` is valid. Returns `true` if valid. + fn check_thread_local(&self, attr: &Attribute, span: Span, target: Target) -> bool { + match target { + Target::ForeignStatic | Target::Static => true, + _ => { + self.tcx + .sess + .struct_span_err(attr.span, "attribute should be applied to a static") + .span_label(span, "not a static") + .emit(); + false + } + } + } + fn doc_attr_str_error(&self, meta: &NestedMetaItem, attr_name: &str) { self.tcx .sess diff --git a/src/test/ui/thread-local/non-static.rs b/src/test/ui/thread-local/non-static.rs new file mode 100644 index 0000000000000..f1c4273870bff --- /dev/null +++ b/src/test/ui/thread-local/non-static.rs @@ -0,0 +1,30 @@ +// Check that #[thread_local] attribute is rejected on non-static items. +#![feature(thread_local)] + +#[thread_local] +//~^ ERROR attribute should be applied to a static +const A: u32 = 0; + +#[thread_local] +//~^ ERROR attribute should be applied to a static +fn main() { + #[thread_local] || {}; + //~^ ERROR attribute should be applied to a static +} + +struct S { + #[thread_local] + //~^ ERROR attribute should be applied to a static + a: String, + b: String, +} + +#[thread_local] +// Static. OK. +static B: u32 = 0; + +extern "C" { + #[thread_local] + // Foreign static. OK. + static C: u32; +} diff --git a/src/test/ui/thread-local/non-static.stderr b/src/test/ui/thread-local/non-static.stderr new file mode 100644 index 0000000000000..09a1618d6e710 --- /dev/null +++ b/src/test/ui/thread-local/non-static.stderr @@ -0,0 +1,38 @@ +error: attribute should be applied to a static + --> $DIR/non-static.rs:4:1 + | +LL | #[thread_local] + | ^^^^^^^^^^^^^^^ +LL | +LL | const A: u32 = 0; + | ----------------- not a static + +error: attribute should be applied to a static + --> $DIR/non-static.rs:8:1 + | +LL | #[thread_local] + | ^^^^^^^^^^^^^^^ +LL | +LL | / fn main() { +LL | | #[thread_local] || {}; +LL | | +LL | | } + | |_- not a static + +error: attribute should be applied to a static + --> $DIR/non-static.rs:11:5 + | +LL | #[thread_local] || {}; + | ^^^^^^^^^^^^^^^ ----- not a static + +error: attribute should be applied to a static + --> $DIR/non-static.rs:16:5 + | +LL | #[thread_local] + | ^^^^^^^^^^^^^^^ +LL | +LL | a: String, + | --------- not a static + +error: aborting due to 4 previous errors +