dart2js: support tear-offs in the startup emitter.

pkg/compiler/lib/src/js_emitter/model.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 dart2js.new_js_emitter.model;
 
 import '../js/js.dart' as js show Expression, Statement, Name, Literal,
     TokenFinalizer;
 import '../constants/values.dart' show ConstantValue;
 
@@ skipping 362 matching lines @@
   /// The element should only be used during the transition to the new model.
   /// Uses indicate missing information in the model.
   final Element element;
   final js.Name name;
   final js.Expression code;
 
   Method(this.element, this.name, this.code);
 }
 
 /// A method that corresponds to a method in the original Dart program.
-class DartMethod extends Method {
+abstract class DartMethod extends Method {
   final bool needsTearOff;
   final js.Name tearOffName;
   final List<ParameterStubMethod> parameterStubs;
   final bool canBeApplied;
   final bool canBeReflected;
 
   // Is non-null if [needsTearOff] or [canBeReflected].
   //
   // If the type is encoded in the metadata table this field contains an index
   // into the table. Otherwise the type contains type variables in which case
@@ skipping 17 matching lines @@
               this.optionalParameterDefaultValues, this.functionType})
       : super(element, name, code) {
     assert(needsTearOff != null);
     assert(!needsTearOff || tearOffName != null);
     assert(canBeApplied != null);
     assert(canBeReflected != null);
     assert((!canBeReflected && !canBeApplied) ||
            (requiredParameterCount != null &&
             optionalParameterDefaultValues != null));
   }
+
+  bool get isStatic;
 }
 
 class InstanceMethod extends DartMethod {
   /// An alternative name for this method. This is used to model calls to
   /// a method via `super`. If [aliasName] is non-null, the emitter has to
   /// ensure that this method is registered on the prototype under both [name]
   /// and [aliasName].
   final js.Name aliasName;
   final bool isClosure;
 
@@ skipping 13 matching lines @@
       : super(element, name, code, parameterStubs, callName,
               needsTearOff: needsTearOff,
               tearOffName: tearOffName,
               canBeApplied: canBeApplied,
               canBeReflected: canBeReflected,
               requiredParameterCount: requiredParameterCount,
               optionalParameterDefaultValues: optionalParameterDefaultValues,
               functionType: functionType) {
     assert(isClosure != null);
   }
+
+  bool get isStatic => false;
 }
 
 /// A method that is generated by the backend and has not direct correspondence
 /// to a method in the original Dart program. Examples are getter and setter
 /// stubs and stubs to dispatch calls to methods with optional parameters.
 class StubMethod extends Method {
   StubMethod(js.Name name, js.Expression code,
              {Element element})
       : super(element, name, code);
 }
@@ skipping 35 matching lines @@
                     /* List | Map */ optionalParameterDefaultValues,
                     js.Expression functionType})
       : super(element, name, code, parameterStubs, callName,
               needsTearOff: needsTearOff,
               tearOffName : tearOffName,
               canBeApplied : canBeApplied,
               canBeReflected : canBeReflected,
               requiredParameterCount: requiredParameterCount,
               optionalParameterDefaultValues: optionalParameterDefaultValues,
               functionType: functionType);
+
+  bool get isStatic => true;
 }
 
 class StaticStubMethod extends StubMethod implements StaticMethod {
   Holder holder;
   StaticStubMethod(js.Name name, this.holder, js.Expression code)
       : super(name, code);
 }