Generative constructor factories for native objects

sdk/lib/_internal/compiler/implementation/js_emitter/code_emitter_task.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.
 
 part of dart2js.js_emitter;
 
 /**
  * Generates the code for all used classes in the program. Static fields (even
  * in classes) are ignored, since they can be treated as non-class elements.
  *
@@ skipping 1486 matching lines @@
     ConstantHandler handler = compiler.constantHandler;
     List<Constant> constants = handler.getConstantsForEmission();
     for (Constant constant in constants) {
       if (constant is TypeConstant) {
         TypeConstant typeConstant = constant;
         Element element = typeConstant.representedType.element;
         if (element is ClassElement) {
           ClassElement classElement = element;
           elements.add(backend.emitter.constantReference(constant));
           elements.add(js(namer.isolateAccess(classElement)));
+
+          // Create JavaScript Object map for by-name lookup of generative

[kasperl, 2013/10/04 11:08:43]

Can we avoid this if document.register isn't being used? Maybe add an example
map to the comment that shows what it maps from and to?

[sra1, 2013/10/04 20:21:28]

It would be slightly more complicated than that - it is actually the helpers
that document.register calls that should be the trigger.

 Maybe add an example
Done.

+          // constructors.
+          var properties = [];
+          classElement.forEachMember(
+              (ClassElement enclosingClass, Element member) {
+                if (member.isGenerativeConstructor()) {
+                  properties.add(
+                      new jsAst.Property(
+                          js.string(member.name.slowToString()),
+                          new jsAst.VariableUse(
+                              backend.namer.isolateAccess(member))));
+                }
+              },
+              includeBackendMembers: false,
+              includeSuperAndInjectedMembers: false);
+
+          var map = new jsAst.ObjectInitializer(properties);
+          elements.add(map);
         }
       }
     }
 
     jsAst.ArrayInitializer array = new jsAst.ArrayInitializer.from(elements);
     String name =
         backend.namer.getNameOfGlobalField(backend.mapTypeToInterceptor);
     jsAst.Expression assignment = js('$isolateProperties.$name = #', array);
 
     buffer.write(jsAst.prettyPrint(assignment, compiler));
@@ skipping 595 matching lines @@
     return compiler.deferredLoadTask.isDeferred(element);
   }
 
   bool get areAnyElementsDeferred {
     return compiler.deferredLoadTask.areAnyElementsDeferred;
   }
 }
 
 // TODO(ahe): Move code for interceptors to own file.
 // TODO(ahe): Move code for reifying metadata/types to own file.