1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27
use rustc_hir as hir;
use rustc_hir::def_id::LocalDefId;
use rustc_middle::ty::query::Providers;
use rustc_middle::ty::TyCtxt;
use rustc_span::symbol::sym;
fn proc_macro_decls_static(tcx: TyCtxt<'_>, (): ()) -> Option<LocalDefId> {
let mut finder = Finder { tcx, decls: None };
for id in tcx.hir().items() {
let attrs = finder.tcx.hir().attrs(id.hir_id());
if finder.tcx.sess.contains_name(attrs, sym::rustc_proc_macro_decls) {
finder.decls = Some(id.def_id);
}
}
finder.decls
}
struct Finder<'tcx> {
tcx: TyCtxt<'tcx>,
decls: Option<hir::def_id::LocalDefId>,
}
pub(crate) fn provide(providers: &mut Providers) {
*providers = Providers { proc_macro_decls_static, ..*providers };
}