Add renames in output when using the mirror helper library.

sdk/lib/_internal/compiler/implementation/dart_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 dart_backend;
 
 String emitCode(
       Unparser unparser,
       Map<LibraryElement, String> imports,
       Iterable<Node> topLevelNodes,
       Map<ClassNode, Iterable<Node>> classMembers) {
   imports.forEach((libraryElement, prefix) {
     unparser.unparseImportTag('${libraryElement.canonicalUri}', prefix);
   });
 
+

[ahe, 2013/08/12 15:43:21]

Extra line.

+  bool isTopLevelMain(Node node) =>

[ahe, 2013/08/12 15:43:21]

In dart2js, we tend to perfer '{ return expr; }' when '=> expr;' doesn't fit on
one line.

[ahe, 2013/08/12 15:43:21]

I'm not at all sure about this method. What is it for?

+    (node is FunctionExpression &&

[ahe, 2013/08/12 15:43:21]

FunctionExpression functionExpression = node.asFunctionExpression();
if (functionExpression != null) {
...
}

+     (node as FunctionExpression).name.asIdentifier().source.

[ahe, 2013/08/12 15:43:21]

....source == const SourceString('main')

+         stringValue == 'main');
+
   for (final node in topLevelNodes) {
-    if (node is ClassNode) {
+    if ((unparser is MirrorRenamerUnparser) && isTopLevelMain(node)) {
+      (unparser as MirrorRenamerUnparser).unparseTopLevelMain(node);

[ahe, 2013/08/12 15:43:21]

Don't use casts, they are slow and unnecessary. Instead introduce a new
variable:

MirrorRenamerUnparser mirrorUnparser = unparser;

+    } else if (node is ClassNode) {
       // TODO(smok): Filter out default constructors here.
       unparser.unparseClassWithBody(node, classMembers[node]);
     } else {
       unparser.unparse(node);
     }
   }
 }