Share LibrarySpecificUnits when possible

pkg/analyzer/lib/src/context/cache.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.context.cache;
 
 import 'dart:async';
 import 'dart:collection';
 
 import 'package:analyzer/src/dart/element/element.dart'
     show ElementImpl, Modifier;
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/java_engine.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/generated/utilities_collection.dart';
 import 'package:analyzer/src/task/model.dart';
+import 'package:analyzer/task/dart.dart';
 import 'package:analyzer/task/model.dart';
 
 /**
  * Return `true` if the [result] of the [target] should be flushed.
  */
 typedef bool FlushResultFilter<V>(
     AnalysisTarget target, ResultDescriptor<V> result);
 
 /**
  * Return `true` if the given [target] is a priority one.
@@ skipping 279 matching lines @@
    */
   static final Map<ResultDescriptor, int> recomputedCounts =
       new HashMap<ResultDescriptor, int>();
 
   /**
    * The target this entry is about.
    */
   final AnalysisTarget target;
 
   /**
+   * A library specific unit associated with the target if the target is a
+   * [Source], or `null` if the target is not a [Source] or if a library
+   * specific unit for the source has not yet been computed.
+   */
+  LibrarySpecificUnit librarySpecificUnit;
+
+  /**
    * The partition that is responsible for this entry.
    */
   CachePartition _partition;
 
   /**
    * The most recent time at which the state of the target matched the state
    * represented by this entry, `-1` if the target does not exist.
    */
   int modificationTime = -1;
 
@@ skipping 768 matching lines @@
     _removeIfSource(target);
     return entry;
   }
 
   /**
    * Records that a value of the result described by the given [descriptor]
    * for the given [target] was just read from the cache.
    */
   void resultAccessed(AnalysisTarget target, ResultDescriptor descriptor) {
     CacheFlushManager flushManager = _getFlushManager(descriptor);
-    TargetedResult result = new TargetedResult(target, descriptor);
+    TargetedResult result =
+        new TargetedResult(context.canonicalizeTarget(target), descriptor);
     flushManager.resultAccessed(result);
   }
 
   /**
    * Records that the given [result] was just stored into the cache.
    */
   void resultStored(TargetedResult result, Object value) {
     CacheFlushManager flushManager = _getFlushManager(result.result);
     List<TargetedResult> resultsToFlush =
         flushManager.resultStored(result, value);
@@ skipping 285 matching lines @@
   void resultAccessed(TargetedResult result) {}
 
   @override
   List<TargetedResult> resultStored(TargetedResult newResult, newValue) {
     return TargetedResult.EMPTY_LIST;
   }
 
   @override
   void targetRemoved(AnalysisTarget target) {}
 }