Split implementation of KernelToElementMapImpl

pkg/compiler/lib/src/kernel/kernel_strategy.dart

 // Copyright (c) 2017, 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 dart2js.kernel.frontend_strategy;
 
 import '../closure.dart';
 import '../common.dart';
 import '../common_elements.dart';
 import '../common/backend_api.dart';
@@ skipping 16 matching lines @@
 import '../js_backend/runtime_types.dart';
 import '../library_loader.dart';
 import '../native/resolver.dart';
 import '../serialization/task.dart';
 import '../patch_parser.dart';
 import '../resolved_uri_translator.dart';
 import '../universe/world_builder.dart';
 import '../universe/world_impact.dart';
 import '../world.dart';
 import 'element_map_impl.dart';
+import 'kernel_backend_strategy.dart';
 
 /// Front end strategy that loads '.dill' files and builds a resolved element
 /// model from kernel IR nodes.
 class KernelFrontEndStrategy implements FrontendStrategy {
-  KernelToElementMapImpl elementMap;
+  KernelToElementMapForImpactImpl elementMap;
 
   KernelAnnotationProcessor _annotationProcesser;
 
   KernelFrontEndStrategy(
       DiagnosticReporter reporter, env.Environment environment)
-      : elementMap = new KernelToElementMapImpl(reporter, environment);
+      : elementMap = useJsStrategyForTesting
+            ? new KernelToElementMapForImpactImpl2(reporter, environment)
+            : new KernelToElementMapImpl(reporter, environment);
 
   @override
   LibraryLoaderTask createLibraryLoader(
       ResolvedUriTranslator uriTranslator,
       ScriptLoader scriptLoader,
       ElementScanner scriptScanner,
       LibraryDeserializer deserializer,
       PatchResolverFunction patchResolverFunc,
       PatchParserTask patchParser,
       env.Environment environment,
@@ skipping 70 matching lines @@
   }
 
   @override
   SourceSpan spanFromSpannable(Spannable spannable, Entity currentElement) {
     // TODO(redemption): Compute source spans from kernel elements.
     return new SourceSpan(null, null, null);
   }
 }
 
 class KernelWorkItemBuilder implements WorkItemBuilder {
-  final KernelToElementMapImpl _elementMap;
+  final KernelToElementMapForImpactImpl _elementMap;
   final ImpactTransformer _impactTransformer;
   final NativeMemberResolver _nativeMemberResolver;
 
   KernelWorkItemBuilder(this._elementMap, NativeBasicData nativeBasicData,
       NativeDataBuilder nativeDataBuilder, this._impactTransformer)
       : _nativeMemberResolver = new KernelNativeMemberResolver(
             _elementMap, nativeBasicData, nativeDataBuilder);
 
   @override
   WorkItem createWorkItem(MemberEntity entity) {
     return new KernelWorkItem(
         _elementMap, _impactTransformer, _nativeMemberResolver, entity);
   }
 }
 
 class KernelWorkItem implements ResolutionWorkItem {
-  final KernelToElementMapImpl _elementMap;
+  final KernelToElementMapForImpactImpl _elementMap;
   final ImpactTransformer _impactTransformer;
   final NativeMemberResolver _nativeMemberResolver;
   final MemberEntity element;
 
   KernelWorkItem(this._elementMap, this._impactTransformer,
       this._nativeMemberResolver, this.element);
 
   @override
   WorldImpact run() {
     _nativeMemberResolver.resolveNativeMember(element);
@@ skipping 51 matching lines @@
   int get preMirrorsMethodCount {
     // TODO(redemption): Implement this.
     return null;
   }
 
   @override
   void onQueueEmpty(Enqueuer enqueuer, Iterable<ClassEntity> recentClasses) {
     // TODO(redemption): Implement this.
   }
 }