Implement reflection on native classes.

dart/sdk/lib/_internal/compiler/implementation/js_backend/emitter.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 js_backend;
 
 /**
  * A function element that represents a closure call. The signature is copied
  * from the given element.
  */
@@ skipping 1815 matching lines @@
       String mixinName = namer.getName(computeMixinClass(classElement));
       superName = '$superName+$mixinName';
       needsMixinSupport = true;
     }
 
     ClassBuilder builder = new ClassBuilder();
     emitClassConstructor(classElement, builder);
     emitSuper(superName, builder);
     emitRuntimeName(runtimeName, builder);
     emitClassFields(classElement, builder, superName);
-    var metadata = buildMetadataFunction(classElement);
-    if (metadata != null) {
-      builder.addProperty("@", metadata);
-    }
     emitClassGettersSetters(classElement, builder);
     if (!classElement.isMixinApplication) {
       emitInstanceMembers(classElement, builder);
     }
     emitIsTests(classElement, builder);
 
+    emitClassBuilderWithReflectionData(
+        className, classElement, builder, buffer);
+  }
+
+  void emitClassBuilderWithReflectionData(String className,
+                                          ClassElement classElement,
+                                          ClassBuilder builder,
+                                          CodeBuffer buffer) {
+    var metadata = buildMetadataFunction(classElement);
+    if (metadata != null) {
+      builder.addProperty("@", metadata);
+    }
+
     List<CodeBuffer> classBuffers = elementBuffers[classElement];
     if (classBuffers == null) {
       classBuffers = [];
     } else {
       elementBuffers.remove(classElement);
     }
     CodeBuffer statics = new CodeBuffer();
     statics.write('{$n');
     bool hasStatics = false;
     ClassBuilder staticsBuilder = new ClassBuilder();
-    if (emitClassFields(
-            classElement, staticsBuilder, superName, emitStatics: true)) {
+    if (emitClassFields(classElement, staticsBuilder, '', emitStatics: true)) {

[ngeoffray, 2013/07/19 09:37:40]

I don't understand this change.

[ahe, 2013/07/19 10:00:00]

The superclass is irrelevant for the static field descriptor.  It was a
copy-and-paste mistake from when I added the 'static' property to class
descriptions.

I've updated the code to make it even clearer.

       hasStatics = true;
       statics.write('"":$_');
       statics.write(
           jsAst.prettyPrint(staticsBuilder.properties.single.value, compiler));
       statics.write(',$n');
     }
     for (CodeBuffer classBuffer in classBuffers) {
       // TODO(ahe): What about deferred?
       if (classBuffer != null) {
         hasStatics = true;
@@ skipping 2026 matching lines @@
 
 const String HOOKS_API_USAGE = """
 // The code supports the following hooks:
 // dartPrint(message)   - if this function is defined it is called
 //                        instead of the Dart [print] method.
 // dartMainRunner(main) - if this function is defined, the Dart [main]
 //                        method will not be invoked directly.
 //                        Instead, a closure that will invoke [main] is
 //                        passed to [dartMainRunner].
 """;