src/librustc/dep_graph/visit.rs

   1 // Copyright 2014 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 use hir;
  12 use hir::def_id::DefId;
  13 use hir::itemlikevisit::ItemLikeVisitor;
  14 use ty::TyCtxt;
  15
  16 use super::dep_node::DepNode;
  17
  18 /// Visit all the items in the krate in some order. When visiting a
  19 /// particular item, first create a dep-node by calling `dep_node_fn`
  20 /// and push that onto the dep-graph stack of tasks, and also create a
  21 /// read edge from the corresponding AST node. This is used in
  22 /// compiler passes to automatically record the item that they are
  23 /// working on.
  24 pub fn visit_all_item_likes_in_krate<'a, 'tcx, V, F>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
  25                                                      mut dep_node_fn: F,
  26                                                      visitor: &mut V)
  27     where F: FnMut(DefId) -> DepNode<DefId>, V: ItemLikeVisitor<'tcx>
  28 {
  29     struct TrackingVisitor<'visit, 'tcx: 'visit, F: 'visit, V: 'visit> {
  30         tcx: TyCtxt<'visit, 'tcx, 'tcx>,
  31         dep_node_fn: &'visit mut F,
  32         visitor: &'visit mut V
  33     }
  34
  35     impl<'visit, 'tcx, F, V> ItemLikeVisitor<'tcx> for TrackingVisitor<'visit, 'tcx, F, V>
  36         where F: FnMut(DefId) -> DepNode<DefId>, V: ItemLikeVisitor<'tcx>
  37     {
  38         fn visit_item(&mut self, i: &'tcx hir::Item) {
  39             let item_def_id = self.tcx.hir.local_def_id(i.id);
  40             let task_id = (self.dep_node_fn)(item_def_id);
  41             let _task = self.tcx.dep_graph.in_task(task_id.clone());
  42             debug!("Started task {:?}", task_id);
  43             self.tcx.dep_graph.read(DepNode::Hir(item_def_id));
  44             self.visitor.visit_item(i);
  45             debug!("Ended task {:?}", task_id);
  46         }
  47
  48         fn visit_trait_item(&mut self, i: &'tcx hir::TraitItem) {
  49             let trait_item_def_id = self.tcx.hir.local_def_id(i.id);
  50             let task_id = (self.dep_node_fn)(trait_item_def_id);
  51             let _task = self.tcx.dep_graph.in_task(task_id.clone());
  52             debug!("Started task {:?}", task_id);
  53             self.tcx.dep_graph.read(DepNode::Hir(trait_item_def_id));
  54             self.visitor.visit_trait_item(i);
  55             debug!("Ended task {:?}", task_id);
  56         }
  57
  58         fn visit_impl_item(&mut self, i: &'tcx hir::ImplItem) {
  59             let impl_item_def_id = self.tcx.hir.local_def_id(i.id);
  60             let task_id = (self.dep_node_fn)(impl_item_def_id);
  61             let _task = self.tcx.dep_graph.in_task(task_id.clone());
  62             debug!("Started task {:?}", task_id);
  63             self.tcx.dep_graph.read(DepNode::Hir(impl_item_def_id));
  64             self.visitor.visit_impl_item(i);
  65             debug!("Ended task {:?}", task_id);
  66         }
  67     }
  68
  69     let krate = tcx.dep_graph.with_ignore(|| tcx.hir.krate());
  70     let mut tracking_visitor = TrackingVisitor {
  71         tcx: tcx,
  72         dep_node_fn: &mut dep_node_fn,
  73         visitor: visitor
  74     };
  75     krate.visit_all_item_likes(&mut tracking_visitor)
  76 }
  77
  78 pub fn visit_all_bodies_in_krate<'a, 'tcx, C>(tcx: TyCtxt<'a, 'tcx, 'tcx>, callback: C)
  79     where C: Fn(/* body_owner */ DefId, /* body id */ hir::BodyId),
  80 {
  81     let krate = tcx.hir.krate();
  82     for &body_id in &krate.body_ids {
  83         let body_owner_def_id = tcx.hir.body_owner_def_id(body_id);
  84         callback(body_owner_def_id, body_id);
  85     }
  86 }