2 use rustc_hir::def_id::LocalDefId;
3 use rustc_hir::itemlikevisit::ItemLikeVisitor;
4 use rustc_middle::ty::query::Providers;
5 use rustc_middle::ty::TyCtxt;
6 use rustc_span::symbol::sym;
8 fn proc_macro_decls_static(tcx: TyCtxt<'_>, (): ()) -> Option<LocalDefId> {
9 let mut finder = Finder { tcx, decls: None };
10 tcx.hir().visit_all_item_likes(&mut finder);
12 finder.decls.map(|id| tcx.hir().local_def_id(id))
17 decls: Option<hir::HirId>,
20 impl<'v> ItemLikeVisitor<'v> for Finder<'_> {
21 fn visit_item(&mut self, item: &hir::Item<'_>) {
22 let attrs = self.tcx.hir().attrs(item.hir_id());
23 if self.tcx.sess.contains_name(attrs, sym::rustc_proc_macro_decls) {
24 self.decls = Some(item.hir_id());
28 fn visit_trait_item(&mut self, _trait_item: &hir::TraitItem<'_>) {}
30 fn visit_impl_item(&mut self, _impl_item: &hir::ImplItem<'_>) {}
32 fn visit_foreign_item(&mut self, _foreign_item: &hir::ForeignItem<'_>) {}
35 pub(crate) fn provide(providers: &mut Providers) {
36 *providers = Providers { proc_macro_decls_static, ..*providers };