Rollback trunk to 3.21.15.

src/handles.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 276 matching lines @@
 
 Handle<String> SubString(Handle<String> str,
                          int start,
                          int end,
                          PretenureFlag pretenure) {
   CALL_HEAP_FUNCTION(str->GetIsolate(),
                      str->SubString(start, end, pretenure), String);
 }
 
 
+Handle<JSObject> Copy(Handle<JSObject> obj) {
+  Isolate* isolate = obj->GetIsolate();
+  CALL_HEAP_FUNCTION(isolate,
+                     isolate->heap()->CopyJSObject(*obj), JSObject);
+}
+
+
+Handle<JSObject> DeepCopy(Handle<JSObject> obj) {
+  Isolate* isolate = obj->GetIsolate();
+  CALL_HEAP_FUNCTION(isolate,
+                     obj->DeepCopy(isolate),
+                     JSObject);
+}
+
+
 // Wrappers for scripts are kept alive and cached in weak global
 // handles referred from foreign objects held by the scripts as long as
 // they are used. When they are not used anymore, the garbage
 // collector will call the weak callback on the global handle
 // associated with the wrapper and get rid of both the wrapper and the
 // handle.
 static void ClearWrapperCache(v8::Isolate* v8_isolate,
                               Persistent<v8::Value>* handle,
                               void*) {
   Handle<Object> cache = Utils::OpenPersistent(handle);
@@ skipping 577 matching lines @@
   data->next = prev_next_;
   data->limit = prev_limit_;
 #ifdef DEBUG
   handles_detached_ = true;
 #endif
   return deferred;
 }
 
 
 } }  // namespace v8::internal