Reverting 3174. Aka reapplying 3150, 3151 and 3159. Aka api accessor

src/handles.cc

 // Copyright 2009 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 87 matching lines @@
 
 
 void HandleScope::ZapRange(Object** start, Object** end) {
   if (start == NULL) return;
   for (Object** p = start; p < end; p++) {
     *reinterpret_cast<Address*>(p) = v8::internal::kHandleZapValue;
   }
 }
 
 
+Address HandleScope::current_extensions_address() {
+  return reinterpret_cast<Address>(&current_.extensions);
+}
+
+
+Address HandleScope::current_next_address() {
+  return reinterpret_cast<Address>(&current_.next);
+}
+
+
+Address HandleScope::current_limit_address() {
+  return reinterpret_cast<Address>(&current_.limit);
+}
+
+
 Handle<FixedArray> AddKeysFromJSArray(Handle<FixedArray> content,
                                       Handle<JSArray> array) {
   CALL_HEAP_FUNCTION(content->AddKeysFromJSArray(*array), FixedArray);
 }
 
 
 Handle<FixedArray> UnionOfKeys(Handle<FixedArray> first,
                                Handle<FixedArray> second) {
   CALL_HEAP_FUNCTION(first->UnionOfKeys(*second), FixedArray);
 }
@@ skipping 639 matching lines @@
   Handle<Map> new_map = Factory::CopyMapDropTransitions(old_map);
   obj->set_map(*new_map);
   new_map->set_needs_loading(true);
   // Store the lazy loading info in the constructor field.  We'll
   // reestablish the constructor from the fixed array after loading.
   new_map->set_constructor(*arr);
   ASSERT(!obj->IsLoaded());
 }
 
 } }  // namespace v8::internal