Address comments

src/librustc/dep_graph/mod.rs

@@ -10,6 +10,7 @@
 
 use self::thread::{DepGraphThreadData, DepMessage};
 use middle::def_id::DefId;
+use syntax::ast::NodeId;
 use middle::ty::TyCtxt;
 use rustc_front::hir;
 use rustc_front::intravisit::Visitor;
@@ -70,7 +71,7 @@ pub enum DepNode {
     IntrinsicCheck(DefId),
     MatchCheck(DefId),
     MirMapConstruction(DefId),
-    MirPasses,
+    MirTypeck(NodeId),
     BorrowCheck(DefId),
     RvalueCheck(DefId),
     Reachability,

src/librustc/mir/transform.rs

@@ -8,6 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+use dep_graph::DepNode;
 use mir::mir_map::MirMap;
 use mir::repr::Mir;
 use middle::ty::TyCtxt;
@@ -23,8 +24,9 @@ pub trait MirMapPass<'tcx>: Pass {
     fn run_pass(&mut self, cx: &TyCtxt<'tcx>, map: &mut MirMap<'tcx>);
 }
 
+/// A pass which inspects Mir of functions in isolation.
 pub trait MirPass<'tcx>: Pass {
-    fn run_pass(&mut self, cx: &TyCtxt<'tcx>, map: &mut Mir<'tcx>);
+    fn run_pass(&mut self, cx: &TyCtxt<'tcx>, mir: &mut Mir<'tcx>);
 }
 
 impl<'tcx, T: MirPass<'tcx>> MirMapPass<'tcx> for T {

src/librustc_driver/driver.rs

@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use rustc::dep_graph::{DepGraph, DepNode};
+use rustc::dep_graph::DepGraph;
 use rustc::front;
 use rustc::front::map as hir_map;
 use rustc_mir as mir;
@@ -862,7 +862,6 @@ pub fn phase_3_run_analysis_passes<'tcx, F, R>(sess: &'tcx Session,
                  || mir::mir_map::build_mir_for_crate(tcx));
 
         time(time_passes, "MIR passes", || {
-            let _task = tcx.dep_graph.in_task(DepNode::MirPasses);
             let mut passes = sess.mir_passes.borrow_mut();
             // Push all the built-in passes.
             passes.push_pass(box mir::transform::remove_dead_blocks::RemoveDeadBlocks);

src/librustc_mir/transform/type_check.rs

@@ -11,6 +11,7 @@
 //! This pass type-checks the MIR to ensure it is not broken.
 #![allow(unreachable_code)]
 
+use rustc::dep_graph::DepNode;
 use rustc::middle::infer::{self, InferCtxt};
 use rustc::middle::traits;
 use rustc::middle::ty::{self, Ty, TyCtxt};
@@ -581,6 +582,7 @@ impl<'tcx> MirMapPass<'tcx> for TypeckMir {
             return;
         }
         for (&id, mir) in &mut map.map {
+            let _task = tcx.dep_graph.in_task(DepNode::MirTypeck(id));
             let param_env = ty::ParameterEnvironment::for_item(tcx, id);
             let infcx = infer::new_infer_ctxt(tcx, &tcx.tables, Some(param_env));
             let mut checker = TypeChecker::new(&infcx);