Change Enqueuer to use Entity instead of Element.

pkg/compiler/lib/src/common/backend_api.dart

 // Copyright (c) 2012, 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.backend_api;
 
 import 'dart:async' show Future;
 
 import '../common.dart';
 import '../common/codegen.dart' show CodegenImpact;
 import '../common/resolution.dart' show ResolutionImpact, Frontend, Target;
 import '../compile_time_constants.dart'
     show BackendConstantEnvironment, ConstantCompilerTask;
 import '../compiler.dart' show Compiler;
 import '../constants/constant_system.dart' show ConstantSystem;
 import '../constants/expressions.dart' show ConstantExpression;
 import '../constants/values.dart' show ConstantValue;
 import '../dart_types.dart' show DartType, InterfaceType;
 import '../elements/elements.dart'
     show ClassElement, Element, FunctionElement, MethodElement, LibraryElement;
+import '../elements/entities.dart';
 import '../enqueue.dart' show Enqueuer, EnqueueTask, ResolutionEnqueuer;
 import '../io/code_output.dart' show CodeBuffer;
 import '../io/source_information.dart' show SourceInformationStrategy;
 import '../js_backend/backend_helpers.dart' as js_backend show BackendHelpers;
 import '../js_backend/js_backend.dart' as js_backend;
 import '../library_loader.dart' show LibraryLoader, LoadedLibraries;
 import '../native/native.dart' as native show NativeEnqueuer, maybeEnableNative;
 import '../patch_parser.dart'
     show checkNativeAnnotation, checkJsInteropAnnotation;
 import '../serialization/serialization.dart'
@@ skipping 184 matching lines @@
     Uri canonicalUri = library.canonicalUri;
     if (canonicalUri == js_backend.BackendHelpers.DART_JS_HELPER ||
         canonicalUri == js_backend.BackendHelpers.DART_INTERCEPTORS) {
       return true;
     }
     return false;
   }
 
   /// Called to register that [element] is statically known to be used. Any
   /// backend specific [WorldImpact] of this is returned.
-  WorldImpact registerStaticUse(Element element, {bool forResolution}) =>
+  WorldImpact registerUsedElement(Element element, {bool forResolution}) =>
       const WorldImpact();
 
   /// This method is called immediately after the [LibraryElement] [library] has
   /// been created.
   void onLibraryCreated(LibraryElement library) {}
 
   /// This method is called immediately after the [library] and its parts have
   /// been scanned.
   Future onLibraryScanned(LibraryElement library, LibraryLoader loader) {
     // TODO(johnniwinther): Move this to [JavaScriptBackend].
@@ skipping 62 matching lines @@
   ///
   /// A return value of [:true:] indicates that [recentClasses] has been
   /// processed and its elements do not need to be seen in the next round. When
   /// [:false:] is returned, [onQueueEmpty] will be called again once the
   /// resolution queue has drained and [recentClasses] will be a superset of the
   /// current value.
   ///
   /// There is no guarantee that a class is only present once in
   /// [recentClasses], but every class seen by the [enqueuer] will be present in
   /// [recentClasses] at least once.
-  bool onQueueEmpty(Enqueuer enqueuer, Iterable<ClassElement> recentClasses) {
+  bool onQueueEmpty(Enqueuer enqueuer, Iterable<ClassEntity> recentClasses) {
     return true;
   }
 
   /// Called after the queue is closed. [onQueueEmpty] may be called multiple
   /// times, but [onQueueClosed] is only called once.
   void onQueueClosed() {}
 
   /// Called when the compiler starts running the codegen enqueuer.
   void onCodegenStart() {}
 
-  /// Called after [element] has been resolved.
-  void onElementResolved(Element element) {}
-
   // Does this element belong in the output
   bool shouldOutput(Element element) => true;
 
   FunctionElement helperForBadMain() => null;
 
   FunctionElement helperForMissingMain() => null;
 
   FunctionElement helperForMainArity() => null;
 
   void forgetElement(Element element) {}
@@ skipping 82 matching lines @@
   ClassElement get typeImplementation;
   ClassElement get boolImplementation;
   ClassElement get nullImplementation;
   ClassElement get uint32Implementation;
   ClassElement get uint31Implementation;
   ClassElement get positiveIntImplementation;
   ClassElement get syncStarIterableImplementation;
   ClassElement get asyncFutureImplementation;
   ClassElement get asyncStarStreamImplementation;
 }