Add dead CodeRegionTable for tracking overwritten Dart code

runtime/bin/vmservice/client/lib/src/service/object.dart

 // Copyright (c) 2014, 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.
 
 part of service;
 
 /// State for a running isolate.
 class Isolate extends ServiceObject {
   final VM vm;
   String get link => _id;
@@ skipping 31 matching lines @@
   /// Creates a relative link to [id] with a '#/' prefix.
   @reflectable String relativeHashLink(String id) => '#/${relativeLink(id)}';
 
   Future<ScriptCache> refreshCoverage() {
     return get('coverage').then(_scripts._processCoverage);
   }
 
   void processProfile(ServiceMap profile) {
     assert(profile.serviceType == 'Profile');
     var codeTable = new List<Code>();
-    var profileCodes = profile['codes'];
-    for (var profileCode in profileCodes) {
-      Code code = profileCode['code'];
+    var codeRegions = profile['codes'];
+    for (var codeRegion in codeRegions) {
+      Code code = codeRegion['code'];
+      assert(code != null);
       codeTable.add(code);
     }
     _codes._resetProfileData();
     _codes._updateProfileData(profile, codeTable);
   }
 
   /// Requests [serviceId] from [this]. Completes to a [ServiceObject].
   /// Can return pre-existing, cached, [ServiceObject]s.
   Future<ServiceObject> get(String serviceId) {
     if (_scripts.cachesId(serviceId)) {
@@ skipping 421 matching lines @@
       calls.add(new CodeCallCount(codes[index], count));
     }
     // Sort to descending count order.
     calls.sort((a, b) => b.count - a.count);
   }
 
 
   void updateProfileData(Map profileData,
                          List<Code> codeTable,
                          int sampleCount) {
-    // Assert we have a ProfileCode entry.
-    assert(profileData['type'] == 'ProfileCode');
+    // Assert we have a CodeRegion entry.
+    assert(profileData['type'] == 'CodeRegion');
     // Assert we are handed profile data for this code object.
     assert(profileData['code'] == this);
     totalSamplesInProfile = sampleCount;
     inclusiveTicks = int.parse(profileData['inclusive_ticks']);
     exclusiveTicks = int.parse(profileData['exclusive_ticks']);
     _resolveCalls(callers, profileData['callers'], codeTable);
     _resolveCalls(callees, profileData['callees'], codeTable);
     var ticks = profileData['ticks'];
     if (ticks != null) {
       _processTicks(ticks);
@@ skipping 71 matching lines @@
 
   int _callCount(List<CodeCallCount> calls, Code code) {
     for (CodeCallCount caller in calls) {
       if (caller.code == code) {
         return caller.count;
       }
     }
     return 0;
   }
 }