Dart2js option to dump info about compilation

sdk/lib/_internal/compiler/implementation/dart_backend/backend.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;
 
 // TODO(ahe): This class is simply wrong.  This backend should use
 // elements when it can, not AST nodes.  Perhaps a [Map<Element,
 // TreeElements>] is what is needed.
 class ElementAst {
@@ skipping 127 matching lines @@
   /// Initialized when dart:mirrors is loaded if the useMirrorHelperLibrary
   /// field is set.
   FunctionElement mirrorHelperGetNameFunction;
   /// Initialized when dart:mirrors is loaded if the useMirrorHelperLibrary
   /// field is set.
   Element mirrorHelperSymbolsMap;
 
   Map<Element, TreeElements> get resolvedElements =>
       compiler.enqueuer.resolution.resolvedElements;
 
+  CodeBuffer emitCodeFor(Element e) {
+    return null; // TODO (sigurdm) Emit the code if available

[ahe, 2013/11/27 19:28:53]

Why isn't this the default implementation?

[sigurdm, 2013/11/29 10:39:37]

Good question

+  }
+

[ahe, 2013/11/27 19:28:53]

Extra line.

[sigurdm, 2013/11/29 10:39:37]

Done.

+
   /**
    * Tells whether it is safe to remove type declarations from variables,
    * functions parameters. It becomes not safe if:
    * 1) TypeError is used somewhere in the code,
    * 2) The code has typedefs in right hand side of IS checks,
    * 3) The code has classes which extend typedefs, have type arguments typedefs
    *    or type variable bounds typedefs.
    * These restrictions can be less strict.
    */
   bool isSafeToRemoveTypeDeclarations(
@@ skipping 474 matching lines @@
 }
 
 compareElements(e0, e1) {
   int result = compareBy((e) => e.getLibrary().canonicalUri.toString())(e0, e1);
   if (result != 0) return result;
   return compareBy((e) => e.position().charOffset)(e0, e1);
 }
 
 List<Element> sortElements(Iterable<Element> elements) =>
     sorted(elements, compareElements);