bjoernager/rust
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Add validation for link attribute position.

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This commit is contained in:
Eric Huss 2022-01-09 11:28:40 -08:00
parent f7bb8e3677
commit 59d4bae018
3 changed files with 264 additions and 161 deletions
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21
compiler/rustc_passes/src/check_attr.rs
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@ -126,6 +126,7 @@ impl CheckAttrVisitor<'_> {
// lint-only checks
match attr.name_or_empty() {
sym::cold => self.check_cold(hir_id, attr, span, target),
sym::link => self.check_link(hir_id, attr, span, target),
sym::link_name => self.check_link_name(hir_id, attr, span, target),
sym::link_section => self.check_link_section(hir_id, attr, span, target),
sym::no_mangle => self.check_no_mangle(hir_id, attr, span, target),
@ -1140,6 +1141,26 @@ impl CheckAttrVisitor<'_> {
}
}
/// Checks if `#[link]` is applied to an item other than a foreign module.
fn check_link(&self, hir_id: HirId, attr: &Attribute, span: &Span, target: Target) {
match target {
Target::ForeignMod => {}
_ => {
self.tcx.struct_span_lint_hir(UNUSED_ATTRIBUTES, hir_id, attr.span, |lint| {
let mut diag = lint.build("attribute should be applied to an `extern` block");
diag.warn(
"this was previously accepted by the compiler but is \
being phased out; it will become a hard error in \
a future release!",
);
diag.span_label(*span, "not an `extern` block");
diag.emit();
});
}
}
}
/// Checks if `#[link_name]` is applied to an item other than a foreign function or static.
fn check_link_name(&self, hir_id: HirId, attr: &Attribute, span: &Span, target: Target) {
match target {