Track computed literal properties.

src/objects-debug.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 294 matching lines @@
   if (HasFastProperties()) {
     CHECK_EQ(map()->unused_property_fields(),
              (map()->inobject_properties() + properties()->length() -
               map()->NextFreePropertyIndex()));
     DescriptorArray* descriptors = map()->instance_descriptors();
     for (int i = 0; i < map()->NumberOfOwnDescriptors(); i++) {
       if (descriptors->GetDetails(i).type() == FIELD) {
         Representation r = descriptors->GetDetails(i).representation();
         int field = descriptors->GetFieldIndex(i);
         Object* value = RawFastPropertyAt(field);
+        if (r.IsDouble()) ASSERT(value->IsHeapNumber());
+        // Ignore values set to undefined. Undefined could be the placeholder
+        // for fields that did not yet have a representation.
+        if (value->IsUndefined()) continue;
         if (r.IsSmi()) ASSERT(value->IsSmi());
-        if (r.IsDouble()) ASSERT(value->IsHeapNumber());
         if (r.IsHeapObject()) ASSERT(value->IsHeapObject());
       }
     }
   }
   CHECK_EQ((map()->has_fast_smi_or_object_elements() ||
              (elements() == GetHeap()->empty_fixed_array())),
             (elements()->map() == GetHeap()->fixed_array_map() ||
              elements()->map() == GetHeap()->fixed_cow_array_map()));
   CHECK(map()->has_fast_object_elements() == HasFastObjectElements());
 }
@@ skipping 792 matching lines @@
   for (int i = 0; i < number_of_transitions(); ++i) {
     if (!CheckOneBackPointer(current_map, GetTarget(i))) return false;
   }
   return true;
 }
 
 
 #endif  // DEBUG
 
 } }  // namespace v8::internal