Return descriptor ownership after TrimDescriptorArray to allow resharing of descriptor arrays

src/objects.cc

 // Copyright 2013 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 9288 matching lines @@
   // TODO(verwaest) Should be an assert, otherwise back pointers are not
   // properly cleared.
   if (transition_index == t->number_of_transitions()) return;
 
   int number_of_own_descriptors = NumberOfOwnDescriptors();
 
   if (descriptors_owner_died) {
     if (number_of_own_descriptors > 0) {
       TrimDescriptorArray(heap, this, descriptors, number_of_own_descriptors);
       ASSERT(descriptors->number_of_descriptors() == number_of_own_descriptors);
+      map->set_owns_descriptors(true);
     } else {
       ASSERT(descriptors == GetHeap()->empty_descriptor_array());
     }
   }
 
   int trim = t->number_of_transitions() - transition_index;
   if (trim > 0) {
     RightTrimFixedArray<FROM_GC>(heap, t, t->IsSimpleTransition()
         ? trim : trim * TransitionArray::kTransitionSize);
   }
@@ skipping 6942 matching lines @@
 #define ERROR_MESSAGES_TEXTS(C, T) T,
   static const char* error_messages_[] = {
       ERROR_MESSAGES_LIST(ERROR_MESSAGES_TEXTS)
   };
 #undef ERROR_MESSAGES_TEXTS
   return error_messages_[reason];
 }
 
 
 } }  // namespace v8::internal