Added per-file stats to -Dscala.timings.

  % pscalac -Dscala.timings ./src/library/scala/util/*.scala
                    phase  id    ms  share
  -----------------------  --  ----  -----
                    typer  4   3632  44.73
               specialize  13  1175  14.47
                  erasure  15   800  9.85
                      jvm  27   504  6.21
                    icode  22   427  5.26
                    ...
        ms  path
  --------  ----------------------------------------------
  1056.667  ./src/library/scala/util/Sorting.scala
  1019.369  ./src/library/scala/util/MurmurHash.scala
   702.881  ./src/library/scala/util/Properties.scala
   435.053  ./src/library/scala/util/Random.scala
   429.702  ./src/library/scala/util/MurmurHash3.scala
   246.453  ./src/library/scala/util/DynamicVariable.scala
    69.755  ./src/library/scala/util/Marshal.scala

Author: paulp

src/compiler/scala/tools/nsc/Global.scala

@@ -343,7 +343,14 @@ class Global(var currentSettings: Settings, var reporter: Reporter) extends Symb
 
     def run() {
       echoPhaseSummary(this)
-      currentRun.units foreach applyPhase
+      currentRun.units foreach { unit =>
+        if (opt.timings) {
+          val start = System.nanoTime
+          try applyPhase(unit)
+          finally unitTimings(unit) += (System.nanoTime - start)
+        }
+        else applyPhase(unit)
+      }
     }
 
     def apply(unit: CompilationUnit): Unit
@@ -669,6 +676,21 @@ class Global(var currentSettings: Settings, var reporter: Reporter) extends Symb
   protected lazy val phasesSet     = new mutable.HashSet[SubComponent]
   protected lazy val phasesDescMap = new mutable.HashMap[SubComponent, String] withDefaultValue ""
   private lazy val phaseTimings = new Phases.TimingModel   // tracking phase stats
+  private lazy val unitTimings = mutable.HashMap[CompilationUnit, Long]() withDefaultValue 0L // tracking time spent per unit
+  private def unitTimingsFormatted(): String = {
+    def toMillis(nanos: Long) = "%.3f" format nanos / 1000000d
+    
+    val formatter = new util.TableDef[(String, String)] {
+      >> ("ms"   -> (_._1)) >+ "  "
+      << ("path" -> (_._2))
+    }
+    "" + (
+      new formatter.Table(unitTimings.toList sortBy (-_._2) map { 
+        case (unit, nanos) => (toMillis(nanos), unit.source.path)
+      })
+    )
+  }
+  
   protected def addToPhasesSet(sub: SubComponent, descr: String) {
     phasesSet += sub
     phasesDescMap(sub) = descr
@@ -1149,8 +1171,10 @@ class Global(var currentSettings: Settings, var reporter: Reporter) extends Symb
       if (opt.profileAll)
         profiler.stopProfiling()
 
-      if (opt.timings)
+      if (opt.timings) {
         inform(phaseTimings.formatted)
+        inform(unitTimingsFormatted)
+      }
 
       // In case no phase was specified for -Xshow-class/object, show it now for sure.
       if (opt.noShow)