2014-05-26 14:48:54 -07:00
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//! Used by `rustc` when compiling a plugin crate.
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2020-01-05 02:37:57 +01:00
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use rustc_hir as hir;
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2021-05-11 12:07:14 +02:00
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use rustc_hir::def_id::LocalDefId;
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2020-01-05 02:37:57 +01:00
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use rustc_hir::itemlikevisit::ItemLikeVisitor;
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2020-03-29 17:19:48 +02:00
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use rustc_middle::ty::query::Providers;
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use rustc_middle::ty::TyCtxt;
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2020-01-01 19:30:57 +01:00
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use rustc_span::symbol::sym;
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2019-12-31 20:15:40 +03:00
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use rustc_span::Span;
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2013-12-25 11:10:33 -07:00
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2020-07-30 11:27:50 +10:00
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struct RegistrarFinder<'tcx> {
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tcx: TyCtxt<'tcx>,
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2021-01-30 17:47:51 +01:00
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registrars: Vec<(LocalDefId, Span)>,
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2013-12-25 11:10:33 -07:00
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}
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2020-07-30 11:27:50 +10:00
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impl<'v, 'tcx> ItemLikeVisitor<'v> for RegistrarFinder<'tcx> {
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2019-11-28 19:28:50 +01:00
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fn visit_item(&mut self, item: &hir::Item<'_>) {
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2019-09-26 17:51:36 +01:00
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if let hir::ItemKind::Fn(..) = item.kind {
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2021-01-24 13:17:54 +01:00
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let attrs = self.tcx.hir().attrs(item.hir_id());
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if self.tcx.sess.contains_name(attrs, sym::plugin_registrar) {
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2021-01-30 17:47:51 +01:00
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self.registrars.push((item.def_id, item.span));
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2013-12-25 11:10:33 -07:00
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}
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}
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2016-12-04 04:21:06 +02:00
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}
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2019-12-22 17:42:04 -05:00
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fn visit_trait_item(&mut self, _trait_item: &hir::TraitItem<'_>) {}
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2016-11-04 18:20:15 -04:00
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2019-12-22 17:42:04 -05:00
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fn visit_impl_item(&mut self, _impl_item: &hir::ImplItem<'_>) {}
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2020-11-11 21:57:54 +01:00
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fn visit_foreign_item(&mut self, _foreign_item: &hir::ForeignItem<'_>) {}
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2013-12-25 11:10:33 -07:00
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}
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2019-02-08 14:53:55 +01:00
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/// Finds the function marked with `#[plugin_registrar]`, if any.
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2021-05-11 12:07:14 +02:00
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fn plugin_registrar_fn(tcx: TyCtxt<'_>, (): ()) -> Option<LocalDefId> {
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2020-07-30 11:27:50 +10:00
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let mut finder = RegistrarFinder { tcx, registrars: Vec::new() };
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2019-01-13 01:06:50 +01:00
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tcx.hir().krate().visit_all_item_likes(&mut finder);
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2013-12-25 11:10:33 -07:00
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2021-05-11 12:07:14 +02:00
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let (def_id, span) = finder.registrars.pop()?;
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if !finder.registrars.is_empty() {
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let diagnostic = tcx.sess.diagnostic();
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let mut e = diagnostic.struct_err("multiple plugin registration functions found");
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e.span_note(span, "one is here");
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for &(_, span) in &finder.registrars {
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e.span_note(span, "one is here");
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2013-12-25 11:10:33 -07:00
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}
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2021-05-11 12:07:14 +02:00
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e.emit();
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diagnostic.abort_if_errors();
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unreachable!();
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2013-12-25 11:10:33 -07:00
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}
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2021-05-11 12:07:14 +02:00
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Some(def_id)
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2013-12-25 11:10:33 -07:00
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}
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2019-01-13 01:06:50 +01:00
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2020-07-05 23:00:14 +03:00
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pub fn provide(providers: &mut Providers) {
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2019-12-22 17:42:04 -05:00
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*providers = Providers { plugin_registrar_fn, ..*providers };
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2019-01-13 01:06:50 +01:00
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}
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