Share LibrarySpecificUnits when possible

pkg/analyzer/lib/src/generated/engine.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.
 
 library analyzer.src.generated.engine;
 
 import 'dart:async';
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
@@ skipping 2123 matching lines @@
    *
    * If the context knows how to provide the value, it sets the value into
    * the [entry] with all required dependencies, and returns `true`.
    *
    * Otherwise, it returns `false` to indicate that the result should be
    * computed as usually.
    */
   bool aboutToComputeResult(CacheEntry entry, ResultDescriptor result);
 
   /**
+   * Return the canonical instance of the given [target].
+   */
+  AnalysisTarget canonicalizeTarget(AnalysisTarget target);
+
+  /**
    * Return a list containing the sources of the libraries that are exported by
    * the library with the given [source]. The list will be empty if the given
    * source is invalid, if the given source does not represent a library, or if
    * the library does not export any other libraries.
    *
    * Throws an [AnalysisException] if the exported libraries could not be
    * computed.
    */
   List<Source> computeExportedLibraries(Source source);
 
@@ skipping 19 matching lines @@
    * Return the cache entry associated with the given [target].
    */
   CacheEntry getCacheEntry(AnalysisTarget target);
 
   /**
    * Return context that owns the given [source].
    */
   InternalAnalysisContext getContextFor(Source source);
 
   /**
+   * Return a library specific unit representing the given [unit] as analyzed in
+   * the given [library].
+   */
+  LibrarySpecificUnit getLibrarySpecificUnit(Source library, Source unit);
+
+  /**
    * Return a change notice for the given [source], creating one if one does not
    * already exist.
    */
   ChangeNoticeImpl getNotice(Source source);
 
   /**
    * Return a namespace containing mappings for all of the public names defined
    * by the given [library].
    */
   Namespace getPublicNamespace(LibraryElement library);
@@ skipping 520 matching lines @@
    * The data that was created from the source.
    */
   final E data;
 
   /**
    * Initialize a newly created holder to associate the given [data] with the
    * given [modificationTime].
    */
   TimestampedData(this.modificationTime, this.data);
 }