Restructuring of JSObject::preventExtensions.

src/messages.h

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // The infrastructure used for (localized) message reporting in V8.
 //
 // Note: there's a big unresolved issue about ownership of the data
 // structures used by this framework.
 
 #ifndef V8_MESSAGES_H_
@@ skipping 74 matching lines @@
   T(ApplyNonFunction,                                                          \
     "Function.prototype.apply was called on %, which is a % and not a "        \
     "function")                                                                \
   T(ArrayFunctionsOnFrozen, "Cannot modify frozen array elements")             \
   T(ArrayFunctionsOnSealed, "Cannot add/remove sealed array elements")         \
   T(ArrayNotSubclassable, "Subclassing Arrays is not currently supported.")    \
   T(CalledNonCallable, "% is not a function")                                  \
   T(CalledOnNonObject, "% called on non-object")                               \
   T(CalledOnNullOrUndefined, "% called on null or undefined")                  \
   T(CannotConvertToPrimitive, "Cannot convert object to primitive value")      \
+  T(CannotPreventExt, "Cannot prevent extensions")                             \
   T(CannotPreventExtExternalArray,                                             \
     "Cannot prevent extension of an object with external array elements")      \
   T(CircularStructure, "Converting circular structure to JSON")                \
   T(ConstAssign, "Assignment to constant variable.")                           \
   T(ConstructorNonCallable,                                                    \
     "Class constructors cannot be invoked without 'new'")                      \
   T(ConstructorNotFunction, "Constructor % requires 'new'")                    \
   T(CurrencyCode, "Currency code is required with currency style.")            \
   T(DataViewNotArrayBuffer,                                                    \
     "First argument to DataView constructor must be an ArrayBuffer")           \
@@ skipping 382 matching lines @@
   static MUST_USE_RESULT MaybeHandle<String> GetStringifiedProperty(
       Isolate* isolate, LookupIterator* property_lookup,
       Handle<String> default_value);
 
   List<Handle<JSObject> > visited_;
 };
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_MESSAGES_H_