1 use rustc_ast::{AttrStyle, 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 validate_attr::check_builtin_meta_item(
20 /// Emit a warning if the item is annotated with the given attribute. This is used to diagnose when
21 /// an attribute may have been mistakenly duplicated.
22 pub fn warn_on_duplicate_attribute(ecx: &ExtCtxt<'_>, item: &Annotatable, name: Symbol) {
23 let attrs: Option<&[Attribute]> = match item {
24 Annotatable::Item(item) => Some(&item.attrs),
25 Annotatable::TraitItem(item) => Some(&item.attrs),
26 Annotatable::ImplItem(item) => Some(&item.attrs),
27 Annotatable::ForeignItem(item) => Some(&item.attrs),
28 Annotatable::Expr(expr) => Some(&expr.attrs),
29 Annotatable::Arm(arm) => Some(&arm.attrs),
30 Annotatable::ExprField(field) => Some(&field.attrs),
31 Annotatable::PatField(field) => Some(&field.attrs),
32 Annotatable::GenericParam(param) => Some(¶m.attrs),
33 Annotatable::Param(param) => Some(¶m.attrs),
34 Annotatable::FieldDef(def) => Some(&def.attrs),
35 Annotatable::Variant(variant) => Some(&variant.attrs),
38 if let Some(attrs) = attrs {
39 if let Some(attr) = ecx.sess.find_by_name(attrs, name) {
40 ecx.parse_sess().buffer_lint(
41 DUPLICATE_MACRO_ATTRIBUTES,
43 ecx.current_expansion.lint_node_id,
44 "duplicated attribute",