ES6: Implement WeakSet

src/bootstrapper.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1306 matching lines @@
     {  // -- M a p
       InstallFunction(global, "Map", JS_MAP_TYPE, JSMap::kSize,
                       isolate()->initial_object_prototype(),
                       Builtins::kIllegal, true, true);
     }
     {  // -- W e a k M a p
       InstallFunction(global, "WeakMap", JS_WEAK_MAP_TYPE, JSWeakMap::kSize,
                       isolate()->initial_object_prototype(),
                       Builtins::kIllegal, true, true);
     }
+    {  // -- W e a k S e t
+      InstallFunction(global, "WeakSet", JS_WEAK_SET_TYPE, JSWeakSet::kSize,
+                      isolate()->initial_object_prototype(),
+                      Builtins::kIllegal, true, true);
+    }
   }
 
   if (FLAG_harmony_array_buffer) {
     // -- A r r a y B u f f e r
     Handle<JSFunction> array_buffer_fun =
         InstallFunction(
             global, "ArrayBuffer", JS_ARRAY_BUFFER_TYPE,
             JSArrayBuffer::kSizeWithInternalFields,
             isolate()->initial_object_prototype(),
             Builtins::kIllegal, true, true);
@@ skipping 1333 matching lines @@
   return from + sizeof(NestingCounterType);
 }
 
 
 // Called when the top-level V8 mutex is destroyed.
 void Bootstrapper::FreeThreadResources() {
   ASSERT(!IsActive());
 }
 
 } }  // namespace v8::internal