Another tweak for displaying performance.

pkg/analyzer/lib/src/task/driver.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library analyzer.src.task.driver;
 
 import 'dart:async';
 import 'dart:collection';
 
 import 'package:analyzer/src/context/cache.dart';
 import 'package:analyzer/src/generated/engine.dart'
     hide AnalysisTask, AnalysisContextImpl;
 import 'package:analyzer/src/generated/java_engine.dart';
 import 'package:analyzer/src/generated/resolver.dart';
 import 'package:analyzer/src/generated/utilities_general.dart';
 import 'package:analyzer/src/task/inputs.dart';
 import 'package:analyzer/src/task/manager.dart';
 import 'package:analyzer/task/model.dart';
 
+final PerformanceTag workOrderMoveNextPerfTag =
+    new PerformanceTag('WorkOrder.moveNext');
+
 /**
  * An object that is used to cause analysis to be performed until all of the
  * required analysis information has been computed.
  */
 class AnalysisDriver {
   /**
    * The task manager used to figure out how to compute analysis results.
    */
   final TaskManager taskManager;
 
@@ skipping 679 matching lines @@
   WorkItem get current {
     if (currentItems == null) {
       return null;
     } else {
       return currentItems.last;
     }
   }
 
   @override
   bool moveNext() {
-    if (currentItems != null && currentItems.length > 1) {
-      // Yield more items.
-      currentItems.removeLast();
-      return true;
-    } else {
-      // Get a new strongly connected component.
-      StronglyConnectedComponent<WorkItem> nextStronglyConnectedComponent =
-          _dependencyWalker.getNextStronglyConnectedComponent();
-      if (nextStronglyConnectedComponent == null) {
-        currentItems = null;
-        return false;
+    return workOrderMoveNextPerfTag.makeCurrentWhile(() {
+      if (currentItems != null && currentItems.length > 1) {
+        // Yield more items.
+        currentItems.removeLast();
+        return true;
+      } else {
+        // Get a new strongly connected component.
+        StronglyConnectedComponent<WorkItem> nextStronglyConnectedComponent =
+            _dependencyWalker.getNextStronglyConnectedComponent();
+        if (nextStronglyConnectedComponent == null) {
+          currentItems = null;
+          return false;
+        }
+        currentItems = nextStronglyConnectedComponent.nodes;
+        if (nextStronglyConnectedComponent.containsCycle) {
+          // A cycle has been found.
+          for (WorkItem item in currentItems) {
+            item.dependencyCycle = currentItems.toList();
+          }
+        } else {
+          assert(currentItems.length == 1);
+        }
+        return true;
       }
-      currentItems = nextStronglyConnectedComponent.nodes;
-      if (nextStronglyConnectedComponent.containsCycle) {
-        // A cycle has been found.
-        for (WorkItem item in currentItems) {
-          item.dependencyCycle = currentItems.toList();
-        }
-      } else {
-        assert(currentItems.length == 1);
-      }
-      return true;
-    }
+    });
   }
 }
 
 /**
  * The priorities of work orders returned by [WorkManager]s.
  */
 enum WorkOrderPriority {
   /**
    * Responding to an user's action.
    */
@@ skipping 25 matching lines @@
   final TaskManager taskManager;
 
   _WorkOrderDependencyWalker(this.taskManager, WorkItem startingNode)
       : super(startingNode);
 
   @override
   WorkItem getNextInput(WorkItem node, List<WorkItem> skipInputs) {
     return node.gatherInputs(taskManager, skipInputs);
   }
 }