1 use rustc_ast::{Attribute, MetaItem};
2 use rustc_expand::base::{Annotatable, ExtCtxt};
3 use rustc_feature::AttributeTemplate;
4 use rustc_lint_defs::builtin::DUPLICATE_MACRO_ATTRIBUTES;
5 use rustc_parse::validate_attr;
6 use rustc_span::Symbol;
8 pub fn check_builtin_macro_attribute(ecx: &ExtCtxt<'_>, meta_item: &MetaItem, name: Symbol) {
9 // All the built-in macro attributes are "words" at the moment.
10 let template = AttributeTemplate { word: true, ..Default::default() };
11 let attr = ecx.attribute(meta_item.clone());
12 validate_attr::check_builtin_attribute(&ecx.sess.parse_sess, &attr, name, template);
15 /// Emit a warning if the item is annotated with the given attribute. This is used to diagnose when
16 /// an attribute may have been mistakenly duplicated.
17 pub fn warn_on_duplicate_attribute(ecx: &ExtCtxt<'_>, item: &Annotatable, name: Symbol) {
18 let attrs: Option<&[Attribute]> = match item {
19 Annotatable::Item(item) => Some(&item.attrs),
20 Annotatable::TraitItem(item) => Some(&item.attrs),
21 Annotatable::ImplItem(item) => Some(&item.attrs),
22 Annotatable::ForeignItem(item) => Some(&item.attrs),
23 Annotatable::Expr(expr) => Some(&expr.attrs),
24 Annotatable::Arm(arm) => Some(&arm.attrs),
25 Annotatable::ExprField(field) => Some(&field.attrs),
26 Annotatable::PatField(field) => Some(&field.attrs),
27 Annotatable::GenericParam(param) => Some(¶m.attrs),
28 Annotatable::Param(param) => Some(¶m.attrs),
29 Annotatable::FieldDef(def) => Some(&def.attrs),
30 Annotatable::Variant(variant) => Some(&variant.attrs),
33 if let Some(attrs) = attrs {
34 if let Some(attr) = ecx.sess.find_by_name(attrs, name) {
35 ecx.parse_sess().buffer_lint(
36 DUPLICATE_MACRO_ATTRIBUTES,
38 ecx.current_expansion.lint_node_id,
39 "duplicated attribute",