Convert most of the javascript isolate code into Dart, inject JS code only when

frog/gen.dart

 // Copyright (c) 2011, 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.
 
 /**
  * Top level generator object for writing code and keeping track of
  * dependencies.
  *
  * Should have two compilation models, but only one implemented so far.
  *
@@ skipping 19 matching lines @@
 
     // TODO(jimhug): Better way to capture hidden control flow.
     world.corelib.types['BadNumberFormatException'].markUsed();
     world.coreimpl.types['NumImplementation'].markUsed();
     world.coreimpl.types['StringImplementation'].markUsed();
     world.coreimpl.types['MatchImplementation'].markUsed();
     genMethod(world.coreimpl.types['MatchImplementation'].getConstructor(''));
     genMethod(
         world.coreimpl.types['StringImplementation'].getMember('contains'));
 
+    // Only include isolate-specific code if isolates are used.
+    if (world.corelib.types['Isolate'].isUsed
+        || world.coreimpl.types['ReceivePortImpl'].isUsed) {
+      corejs.useIsolates = true;
+      MethodMember isolateMain =
+          world.coreimpl.topType.resolveMember('startAsIsolate').members[0];
+      mainCall = isolateMain.invoke(metaGen, null, null,
+          new Arguments(null, [main._get(metaGen, main.definition, null)]));
+    }
+
     writeTypes(world.coreimpl);
     writeTypes(world.corelib);
 
     // Write the main library. This will cause all libraries to be written in
     // the topographic sort order.
     writeTypes(main.declaringType.library);
 
     _writeGlobals();
-    writer.writeln('RunEntry(function() {${mainCall.code};}, []);');
+    writer.writeln('${mainCall.code};');
   }
 
   GlobalValue globalForStaticField(FieldMember field, Value fieldValue,
       List<Value> dependencies) {
     var fullname = "${field.declaringType.jsname}.${field.jsname}";
     if (!globals.containsKey(fullname)) {
       globals[fullname] = new GlobalValue.fromStatic(
           field, fieldValue, dependencies);
     }
     return globals[fullname];
@@ skipping 2179 matching lines @@
       result.add(new Value(world.varType, '\$$i', null, /*needsTemp:*/false));
     }
     for (int i = bareCount; i < length; i++) {
       var name = getName(i);
       if (name == null) name = '\$$i';
       result.add(new Value(world.varType, name, null, /*needsTemp:*/false));
     }
     return new Arguments(nodes, result);
   }
 }