Improve elements validation and object printing

src/objects-inl.h

 // Copyright 2012 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.
 //
 // Review notes:
 //
 // - The use of macros in these inline functions may seem superfluous
 // but it is absolutely needed to make sure gcc generates optimal
 // code. gcc is not happy when attempting to inline too deep.
 //
@@ skipping 1761 matching lines @@
       TransitionElementsKind(object, FAST_ELEMENTS);
     }
   }
 }
 
 
 void JSObject::EnsureCanContainElements(Handle<JSObject> object,
                                         Object** objects,
                                         uint32_t count,
                                         EnsureElementsMode mode) {
-  ElementsKind current_kind = object->map()->elements_kind();
+  ElementsKind current_kind = object->GetElementsKind();
   ElementsKind target_kind = current_kind;
   {
     DisallowHeapAllocation no_allocation;
     DCHECK(mode != ALLOW_COPIED_DOUBLE_ELEMENTS);
     bool is_holey = IsFastHoleyElementsKind(current_kind);
     if (current_kind == FAST_HOLEY_ELEMENTS) return;
     Heap* heap = object->GetHeap();
     Object* the_hole = heap->the_hole_value();
     for (uint32_t i = 0; i < count; ++i) {
       Object* current = *objects++;
@@ skipping 6009 matching lines @@
 #undef WRITE_INT64_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 #undef NOBARRIER_READ_BYTE_FIELD
 #undef NOBARRIER_WRITE_BYTE_FIELD
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_OBJECTS_INL_H_