src/librustc_metadata/foreign_modules.rs

   1 use rustc_hir as hir;
   2 use rustc_hir::itemlikevisit::ItemLikeVisitor;
   3 use rustc_middle::middle::cstore::ForeignModule;
   4 use rustc_middle::ty::TyCtxt;
   5
   6 crate fn collect(tcx: TyCtxt<'_>) -> Vec<ForeignModule> {
   7     let mut collector = Collector { tcx, modules: Vec::new() };
   8     tcx.hir().krate().visit_all_item_likes(&mut collector);
   9     collector.modules
  10 }
  11
  12 struct Collector<'tcx> {
  13     tcx: TyCtxt<'tcx>,
  14     modules: Vec<ForeignModule>,
  15 }
  16
  17 impl ItemLikeVisitor<'tcx> for Collector<'tcx> {
  18     fn visit_item(&mut self, it: &'tcx hir::Item<'tcx>) {
  19         let fm = match it.kind {
  20             hir::ItemKind::ForeignMod(ref fm) => fm,
  21             _ => return,
  22         };
  23
  24         let foreign_items =
  25             fm.items.iter().map(|it| self.tcx.hir().local_def_id(it.hir_id)).collect();
  26         self.modules
  27             .push(ForeignModule { foreign_items, def_id: self.tcx.hir().local_def_id(it.hir_id) });
  28     }
  29
  30     fn visit_trait_item(&mut self, _it: &'tcx hir::TraitItem<'tcx>) {}
  31     fn visit_impl_item(&mut self, _it: &'tcx hir::ImplItem<'tcx>) {}
  32 }