Generative constructor factories for native objects

sdk/lib/_internal/compiler/implementation/js_emitter/code_emitter_task.dart

Index: sdk/lib/_internal/compiler/implementation/js_emitter/code_emitter_task.dart
diff --git a/sdk/lib/_internal/compiler/implementation/js_emitter/code_emitter_task.dart b/sdk/lib/_internal/compiler/implementation/js_emitter/code_emitter_task.dart
index e9d9642cdefc32c4789422ced05c525ded3d58a6..5a1ff475881794a7274c6573a4ca2a2c0cd28f91 100644
--- a/sdk/lib/_internal/compiler/implementation/js_emitter/code_emitter_task.dart
+++ b/sdk/lib/_internal/compiler/implementation/js_emitter/code_emitter_task.dart
@@ -1504,6 +1504,25 @@ class CodeEmitterTask extends CompilerTask {
           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);
         }
       }
     }