From aa265869baf55d59d310edf76fef50026d7c70e3 Mon Sep 17 00:00:00 2001
From: Niko Matsakis <niko@alum.mit.edu>
Date: Tue, 5 Jan 2016 13:07:45 -0500
Subject: [PATCH] Add DepGraph to tcx.

---
 src/librustc/middle/ty/context.rs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/librustc/middle/ty/context.rs b/src/librustc/middle/ty/context.rs
index cee651743ca..e700abf9db1 100644
--- a/src/librustc/middle/ty/context.rs
+++ b/src/librustc/middle/ty/context.rs
@@ -13,6 +13,7 @@
 // FIXME: (@jroesch) @eddyb should remove this when he renames ctxt
 #![allow(non_camel_case_types)]
 
+use dep_graph::{DepGraph, DepNode, DepTrackingMap};
 use front::map as ast_map;
 use session::Session;
 use lint;
@@ -224,6 +225,8 @@ pub struct ctxt<'tcx> {
     region_interner: RefCell<FnvHashMap<&'tcx Region, &'tcx Region>>,
     stability_interner: RefCell<FnvHashMap<&'tcx attr::Stability, &'tcx attr::Stability>>,
 
+    pub dep_graph: DepGraph,
+
     /// Common types, pre-interned for your convenience.
     pub types: CommonTypes<'tcx>,
 
@@ -483,7 +486,7 @@ impl<'tcx> ctxt<'tcx> {
     {
         let interner = RefCell::new(FnvHashMap());
         let common_types = CommonTypes::new(&arenas.type_, &interner);
-
+        let dep_graph = DepGraph::new(s.opts.incremental_compilation);
         tls::enter(ctxt {
             arenas: arenas,
             interner: interner,
@@ -491,6 +494,7 @@ impl<'tcx> ctxt<'tcx> {
             bare_fn_interner: RefCell::new(FnvHashMap()),
             region_interner: RefCell::new(FnvHashMap()),
             stability_interner: RefCell::new(FnvHashMap()),
+            dep_graph: dep_graph.clone(),
             types: common_types,
             named_region_map: named_region_map,
             region_maps: region_maps,