Encode super calls via extra properties on prototypes.

sdk/lib/_internal/compiler/implementation/js_emitter/old_emitter/emitter.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.
 
 part of dart2js.js_emitter;
 
 
 class OldEmitter implements Emitter {
   final Compiler compiler;
   final CodeEmitterTask task;
@@ skipping 294 matching lines @@
   /** Needs defineClass to be defined. */
   List buildInheritFrom() {
     return [js(r'''
         var inheritFrom = function() {
           function tmp() {}
           var hasOwnProperty = Object.prototype.hasOwnProperty;
           return function (constructor, superConstructor) {
             tmp.prototype = superConstructor.prototype;
             var object = new tmp();
             var properties = constructor.prototype;
-            for (var member in properties)
-              if (hasOwnProperty.call(properties, member))
-                object[member] = properties[member];
+            for (var member in properties) {
+              if (hasOwnProperty.call(properties, member)) {
+                var s = member.split(':');
+                if (s.length > 1) {
+                  object[s[0]] = object[s[1]] = properties[member];
+                } else {
+                  object[member] = properties[member];
+                }
+              }
+            }
             object.constructor = constructor;
             constructor.prototype = object;
             return object;
           };
         }()
       ''')];
   }
 
   jsAst.Fun get finishClassesFunction {
     // Class descriptions are collected in a JS object.
@@ skipping 38 matching lines @@
              "function \$reflectable(fn){fn.$reflectableField=1;return fn};\\n"+
              "var \$desc;\\n";
           var constructorsList = [];
         }
 
         for (var cls in collectedClasses) {
           var desc = collectedClasses[cls];
           if (desc instanceof Array) desc = desc[1];
 
           /* The 'fields' are either a constructor function or a
-           * string encoding fields, constructor and superclass.  Get
-           * the superclass and the fields in the format
+           * string encoding fields, constructor and superclass. Get the

[floitsch, 2014/11/04 13:35:21]

Gets

[herhut, 2014/11/04 13:55:37]

Done.

+           * superclass and fields in the format
            *   '[name/]Super;field1,field2'
            * from the CLASS_DESCRIPTOR_PROPERTY property on the descriptor.
            * The 'name/' is optional and contains the name that should be used
            * when printing the runtime type string.  It is used, for example,
            * to print the runtime type JSInt as 'int'.
            */
           var classData = desc["${namer.classDescriptorProperty}"],
               supr, name = cls, fields = classData;
           if (#)  // backend.hasRetainedMetadata
             if (typeof classData == "object" &&
@@ skipping 1601 matching lines @@
     for (Element element in compiler.enqueuer.codegen.newlyEnqueuedElements) {
       if (element.isInstanceMember) {
         cachedClassBuilders.remove(element.enclosingClass);
 
         nativeEmitter.cachedBuilders.remove(element.enclosingClass);
 
       }
     }
   }
 }