Add J-elements

pkg/compiler/lib/src/js_model/js_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.js_model.strategy;
 
 import '../backend_strategy.dart';
+import '../common/tasks.dart';
 import '../common_elements.dart';
 import '../compiler.dart';
 import '../elements/elements.dart' show TypedefElement;
 import '../elements/entities.dart';
 import '../enqueue.dart';
 import '../io/source_information.dart';
 import '../js_emitter/sorter.dart';
 import '../js/js_source_mapping.dart';
 import '../js_backend/backend.dart';
 import '../js_backend/backend_usage.dart';
 import '../js_backend/constant_system_javascript.dart';
 import '../js_backend/interceptor_data.dart';
 import '../js_backend/native_data.dart';
+import '../kernel/element_map.dart';
+import '../kernel/element_map_impl.dart';
 import '../kernel/kernel_backend_strategy.dart';
+import '../kernel/kernel_strategy.dart';
 import '../ssa/ssa.dart';
 import '../universe/class_set.dart';
 import '../universe/world_builder.dart';
 import '../util/emptyset.dart';
 import '../world.dart';
 import 'elements.dart';
 
 class JsBackendStrategy implements BackendStrategy {
   final Compiler _compiler;
-  final JsToFrontendMap _map = new JsToFrontendMap();
+  final JsToFrontendMap _map = new JsToFrontendMapImpl();
+  ElementEnvironment _elementEnvironment;
+  CommonElements _commonElements;
 
   JsBackendStrategy(this._compiler);
 
   @override
   ClosedWorldRefiner createClosedWorldRefiner(ClosedWorld closedWorld) {
-    CommonElements commonElements =
-        new JsCommonElements(_map, closedWorld.commonElements);
+    _elementEnvironment =
+        new JsElementEnvironment(_map, closedWorld.elementEnvironment);
+    _commonElements = new JsCommonElements(_map, closedWorld.commonElements);
     BackendUsage backendUsage =
         new JsBackendUsage(_map, closedWorld.backendUsage);
     NativeData nativeData = new JsNativeData(_map, closedWorld.nativeData);
     InterceptorData interceptorData = new InterceptorDataImpl(
         nativeData,
-        commonElements,
+        _commonElements,
         // TODO(johnniwinther): Convert these.
         const {},
         new Set(),
         new Set());
 
     Map<ClassEntity, ClassHierarchyNode> classHierarchyNodes =
         <ClassEntity, ClassHierarchyNode>{};
     Map<ClassEntity, ClassSet> classSets = <ClassEntity, ClassSet>{};
     Set<ClassEntity> implementedClasses = new Set<ClassEntity>();
 
@@ skipping 27 matching lines @@
       });
     }
 
     closedWorld
         .getClassHierarchyNode(closedWorld.commonElements.objectClass)
         .forEachSubclass((ClassEntity cls) {
       convertClassSet(closedWorld.getClassSet(cls));
     }, ClassHierarchyNode.ALL);
 
     return new JsClosedWorld(
-        // TODO(johnniwinther): Create a JsElementEnvironment.
-        elementEnvironment: closedWorld.elementEnvironment,
-        commonElements: commonElements,
+        elementEnvironment: _elementEnvironment,
+        commonElements: _commonElements,
         constantSystem: const JavaScriptConstantSystem(),
         backendUsage: backendUsage,
         nativeData: nativeData,
         interceptorData: interceptorData,
         classHierarchyNodes: classHierarchyNodes,
         classSets: classSets,
         implementedClasses: implementedClasses,
         // TODO(johnniwinther): Support this.
         allTypedefs: new ImmutableEmptySet<TypedefElement>());
   }
 
   @override
   Sorter get sorter {
     throw new UnimplementedError('JsBackendStrategy.sorter');
   }
 
   @override
   void convertClosures(ClosedWorldRefiner closedWorldRefiner) {}
 
   @override
   SourceInformationStrategy get sourceInformationStrategy =>
       const JavaScriptSourceInformationStrategy();
 
   @override
-  SsaBuilderTask createSsaBuilderTask(JavaScriptBackend backend,
+  SsaBuilder createSsaBuilder(CompilerTask task, JavaScriptBackend backend,
       SourceInformationStrategy sourceInformationStrategy) {
-    return new KernelSsaBuilderTask(backend.compiler);
+    KernelFrontEndStrategy strategy = backend.compiler.frontendStrategy;
+    KernelToElementMap elementMap = strategy.elementMap;
+    JsKernelToElementMap jsElementMap = new JsKernelToElementMap(
+        _map, _elementEnvironment, _commonElements, elementMap);
+    return new KernelSsaBuilder(task, backend.compiler, jsElementMap);
   }
 
   @override
   WorkItemBuilder createCodegenWorkItemBuilder(ClosedWorld closedWorld) {
     return new KernelCodegenWorkItemBuilder(_compiler.backend, closedWorld);
   }
 
   @override
   CodegenWorldBuilder createCodegenWorldBuilder(
       NativeBasicData nativeBasicData,
       ClosedWorld closedWorld,
       SelectorConstraintsStrategy selectorConstraintsStrategy) {
     return new KernelCodegenWorldBuilder(closedWorld.elementEnvironment,
         nativeBasicData, closedWorld, selectorConstraintsStrategy);
   }
 }