Add ConstructorBodyEntity

pkg/compiler/lib/src/elements/entities.dart

 // Copyright (c) 2016, 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 entities;
 
 import 'package:front_end/src/fasta/parser/async_modifier.dart'
     show AsyncModifier;
 
 import '../common.dart';
@@ skipping 188 matching lines @@
   bool get isGenerativeConstructor;
 
   /// Whether this is a factory constructor, possibly redirecting.
   bool get isFactoryConstructor;
 
   /// Whether this is a `fromEnvironment` const constructor in `int`, `bool` or
   /// `String`.
   bool get isFromEnvironmentConstructor;
 }
 
+/// The constructor body for a [ConstructorEntity].
+///
+/// This is used only in the backend to split encoding of a Dart constructor
+/// into two JavaScript functions; the constructor and the constructor body.
+// TODO(johnniwinther): Remove this when modelx is removed. Constructor bodies
+// should then be created directly with the J-model.
+abstract class ConstructorBodyEntity extends FunctionEntity {
+  /// The constructor for which this constructor body was created.
+  ConstructorEntity get constructor;
+}
+
 /// An entity that defines a local entity (memory slot) in generated code.
 ///
 /// Parameters, local variables and local functions (can) define local entity
 /// and thus implement [Local] through [LocalElement]. For non-element locals,
 /// like `this` and boxes, specialized [Local] classes are created.
 ///
 /// Type variables can introduce locals in factories and constructors
 /// but since one type variable can introduce different locals in different
 /// factories and constructors it is not itself a [Local] but instead
 /// a non-element [Local] is created through a specialized class.
@@ skipping 36 matching lines @@
   /// The total number of parameters (required or optional).
   int get totalParameters => positionalParameters + namedParameters.length;
 
   /// Returns the [CallStructure] corresponding to a call site passing all
   /// parameters both required and optional.
   CallStructure get callStructure {
     return new CallStructure(
         positionalParameters + namedParameters.length, namedParameters);
   }
 }