Check for read-only-ness when preparing for array sort.

src/objects.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 11878 matching lines @@
   int capacity = dict->Capacity();
   for (int i = 0; i < capacity; i++) {
     Object* k = dict->KeyAt(i);
     if (dict->IsKey(k)) {
       ASSERT(k->IsNumber());
       ASSERT(!k->IsSmi() || Smi::cast(k)->value() >= 0);
       ASSERT(!k->IsHeapNumber() || HeapNumber::cast(k)->value() >= 0);
       ASSERT(!k->IsHeapNumber() || HeapNumber::cast(k)->value() <= kMaxUInt32);
       Object* value = dict->ValueAt(i);
       PropertyDetails details = dict->DetailsAt(i);
-      if (details.type() == CALLBACKS) {
+      if (details.type() == CALLBACKS || details.IsReadOnly()) {
         // Bail out and do the sorting of undefineds and array holes in JS.
+        // Also bail out if the element is not supposed to be moved.
         return Smi::FromInt(-1);
       }
       uint32_t key = NumberToUint32(k);
       // In the following we assert that adding the entry to the new dictionary
       // does not cause GC.  This is the case because we made sure to allocate
       // the dictionary big enough above, so it need not grow.
       if (key < limit) {
         if (value->IsUndefined()) {
           undefs++;
         } else {
@@ skipping 1812 matching lines @@
   set_year(Smi::FromInt(year), SKIP_WRITE_BARRIER);
   set_month(Smi::FromInt(month), SKIP_WRITE_BARRIER);
   set_day(Smi::FromInt(day), SKIP_WRITE_BARRIER);
   set_weekday(Smi::FromInt(weekday), SKIP_WRITE_BARRIER);
   set_hour(Smi::FromInt(hour), SKIP_WRITE_BARRIER);
   set_min(Smi::FromInt(min), SKIP_WRITE_BARRIER);
   set_sec(Smi::FromInt(sec), SKIP_WRITE_BARRIER);
 }
 
 } }  // namespace v8::internal