Implement IsolateMirror.

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 3737 matching lines @@
           if (buffer != null) {
             var metadata = buildMetadataFunction(library);
             mainBuffer
                 ..write('["${library.getLibraryOrScriptName()}",$_')
                 ..write('"${uri}",$_')
                 ..write(metadata == null
                         ? "" : jsAst.prettyPrint(metadata, compiler))
                 ..write(',$_')
                 ..write('{$n')
                 ..addBuffer(buffer)
-                ..write('}],$n');
+                ..write('}');
+            if (library == compiler.mainApp) {
+              mainBuffer.write(',${n}1');
+            }
+            mainBuffer.write('],$n');
           }
           buffer = buffers[1];
           if (buffer != null) {
             deferredLibraries
                 ..write('["${library.getLibraryOrScriptName()}",$_')
                 ..write('"${uri}",$_')
                 ..write('[],$_')
                 ..write('{$n')
                 ..addBuffer(buffer)
                 ..write('}],$n');
@@ skipping 200 matching lines @@
   var mangledNames = init.mangledNames;
   var mangledGlobalNames = init.mangledGlobalNames;
   var hasOwnProperty = Object.prototype.hasOwnProperty;
   var length = reflectionData.length;
   for (var i = 0; i < length; i++) {
     var data = reflectionData[i];
     var name = data[0];
     var uri = data[1];
     var metadata = data[2];
     var descriptor = data[3];
+    var isRoot = !!data[4];

[kustermann, 2013/07/25 14:56:45]

I guess this double negation is because the last parameter is optional?

[ahe, 2013/07/25 18:01:01]

Yes. We use it so frequently in dart2js that we don't normally document it.

It is important for checked mode.

     var fields = descriptor && descriptor[""];
     var classes = [];
     var functions = [];
     function processStatics(descriptor) {
       for (var property in descriptor) {
         if (!hasOwnProperty.call(descriptor, property)) continue;
         if (property === "") continue;
         var element = descriptor[property];
         var firstChar = property.substring(0, 1);
         var previousProperty;
@@ skipping 21 matching lines @@
             } else {
               newDesc[previousProp = prop] = element[prop];
             }
           }
           $classesCollector[property] = newDesc;
           classes.push(property);
         }
       }
     }
     processStatics(descriptor);
-    libraries.push([name, uri, classes, functions, metadata, fields]);
+    libraries.push([name, uri, classes, functions, metadata, fields, isRoot]);
   }
 })''';
   }
 }
 
 const String GENERATED_BY = """
 // Generated by dart2js, the Dart to JavaScript compiler.
 """;
 
 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].
 """;