Add TypeVariable object on runtime to support reflection on type variables.

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

Index: sdk/lib/_internal/compiler/implementation/js_emitter/class_emitter.dart
diff --git a/sdk/lib/_internal/compiler/implementation/js_emitter/class_emitter.dart b/sdk/lib/_internal/compiler/implementation/js_emitter/class_emitter.dart
index edf808f5b97b28aa514d411ba67ea39d9d6ff7ad..b29e8d5582e0ecb51d10709ca9a9d66614281f60 100644
--- a/sdk/lib/_internal/compiler/implementation/js_emitter/class_emitter.dart
+++ b/sdk/lib/_internal/compiler/implementation/js_emitter/class_emitter.dart
@@ -5,6 +5,7 @@
 part of dart2js.js_emitter;
 
 class ClassEmitter extends CodeEmitterHelper {
+

[ahe, 2013/10/15 14:56:31]

Extra line.

[zarah, 2013/10/16 07:00:47]

Done.

   /**
    * Documentation wanted -- johnniwinther
    *
@@ -291,9 +292,9 @@ class ClassEmitter extends CodeEmitterHelper {
     if (backend.isNeededForReflection(classElement)) {
       Link typeVars = classElement.typeVariables;
       List properties = [];
-      for (TypeVariableType typeVar in typeVars) {
-        properties.add(js.string(typeVar.name.slowToString()));
-        properties.add(js.toExpression(task.reifyType(typeVar.element.bound)));
+      if (task.typeVariableHandler.typeVariablesOf(classElement) != null) {
+        properties = task.typeVariableHandler.typeVariablesOf(classElement)
+            .map((s) => js.toExpression(s));

[ahe, 2013/10/15 14:56:31]

"(s) => js.toExpression(s)" is equivalent to "js.toExpression" due to tear-off
closures.

[zarah, 2013/10/16 07:00:47]

Done.

       }
 
       ClassElement superclass = classElement.superclass;
@@ -340,11 +341,15 @@ class ClassEmitter extends CodeEmitterHelper {
     buffer.write(jsAst.prettyPrint(builder.toObjectInitializer(), compiler));
     String reflectionName = task.getReflectionName(classElement, className);
     if (reflectionName != null) {
-      List<int> interfaces = <int>[];
-      for (DartType interface in classElement.interfaces) {
-        interfaces.add(task.reifyType(interface));
+      if (!backend.isNeededForReflection(classElement)) {
+        buffer.write(',$n$n"+$reflectionName": 0');
+      } else {
+        List<int> interfaces = <int>[];
+        for (DartType interface in classElement.interfaces) {
+          interfaces.add(task.reifyType(interface));
+        }
+        buffer.write(',$n$n"+$reflectionName": $interfaces');
       }
-      buffer.write(',$n$n"+$reflectionName": $interfaces');
     }
   }