Add J-elements

pkg/compiler/lib/src/js_backend/backend.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 js_backend.backend;
 
 import '../common.dart';
 import '../common/backend_api.dart'
     show ForeignResolver, NativeRegistry, ImpactTransformer;
 import '../common/codegen.dart' show CodegenWorkItem;
@@ skipping 60 matching lines @@
 import 'native_data.dart';
 import 'no_such_method_registry.dart';
 import 'patch_resolver.dart';
 import 'resolution_listener.dart';
 import 'runtime_types.dart';
 import 'type_variable_handler.dart';
 
 const VERBOSE_OPTIMIZER_HINTS = false;
 
 abstract class FunctionCompiler {
+  void onCodegenStart();
+
   /// Generates JavaScript code for `work.element`.
   jsAst.Fun compile(CodegenWorkItem work, ClosedWorld closedWorld);
 
   Iterable get tasks;
 }
 
 /*
  * Invariants:
  *   canInline(function) implies canInline(function, insideLoop:true)
  *   !canInline(function, insideLoop: true) implies !canInline(function)
@@ skipping 964 matching lines @@
         ..add(commonElements.objectClass)
         ..add(commonElements.jsInterceptorClass)
         ..add(commonElements.jsNullClass);
     }
   }
 
   /// Called when the compiler starts running the codegen enqueuer. The
   /// [WorldImpact] of enabled backend features is returned.
   WorldImpact onCodegenStart(
       ClosedWorld closedWorld, CodegenWorldBuilder codegenWorldBuilder) {
+    functionCompiler.onCodegenStart();
     _oneShotInterceptorData = new OneShotInterceptorData(
         closedWorld.interceptorData, closedWorld.commonElements);
     _namer = determineNamer(closedWorld, codegenWorldBuilder);
     tracer = new Tracer(closedWorld, namer, compiler);
     _rtiEncoder = _namer.rtiEncoder = new RuntimeTypesEncoderImpl(
         namer, closedWorld.elementEnvironment, closedWorld.commonElements);
     emitter.createEmitter(namer, closedWorld, codegenWorldBuilder);
     _codegenImpactTransformer = new CodegenImpactTransformer(
         compiler.options,
         closedWorld.elementEnvironment,
@@ skipping 319 matching lines @@
 
   bool canUseAliasedSuperMember(MemberEntity member, Selector selector) {
     return !selector.isGetter;
   }
 
   /// Returns `true` if [member] is called from a subclass via `super`.
   bool isAliasedSuperMember(MemberEntity member) {
     return _aliasedSuperMembers.contains(member);
   }
 }