Make instance_size immediately useful for all fixed size objects.

src/objects.cc

 // Copyright 2006-2009 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 1006 matching lines @@
       accumulator->Add("Cell for ");
       JSGlobalPropertyCell::cast(this)->value()->ShortPrint(accumulator);
       break;
     default:
       accumulator->Add("<Other heap object (%d)>", map()->instance_type());
       break;
   }
 }
 
 
-int HeapObject::SlowSizeFromMap(Map* map) {
-  // Avoid calling functions such as FixedArray::cast during GC, which
-  // read map pointer of this object again.
-  InstanceType instance_type = map->instance_type();
-  uint32_t type = static_cast<uint32_t>(instance_type);
-
-  if (instance_type < FIRST_NONSTRING_TYPE
-      && (StringShape(instance_type).IsSequential())) {
-    if ((type & kStringEncodingMask) == kAsciiStringTag) {
-      SeqAsciiString* seq_ascii_this = reinterpret_cast<SeqAsciiString*>(this);
-      return seq_ascii_this->SeqAsciiStringSize(instance_type);
-    } else {
-      SeqTwoByteString* self = reinterpret_cast<SeqTwoByteString*>(this);
-      return self->SeqTwoByteStringSize(instance_type);
-    }
-  }
-
-  switch (instance_type) {
-    case FIXED_ARRAY_TYPE:
-      return FixedArray::BodyDescriptor::SizeOf(map, this);
-    case BYTE_ARRAY_TYPE:
-      return reinterpret_cast<ByteArray*>(this)->ByteArraySize();
-    case CODE_TYPE:
-      return reinterpret_cast<Code*>(this)->CodeSize();
-    case MAP_TYPE:
-      return Map::kSize;
-    default:
-      return map->instance_size();
-  }
-}
-
-
 void HeapObject::Iterate(ObjectVisitor* v) {
   // Handle header
   IteratePointer(v, kMapOffset);
   // Handle object body
   Map* m = map();
   IterateBody(m->instance_type(), SizeFromMap(m), v);
 }
 
 
 void HeapObject::IterateBody(InstanceType type, int object_size,
@@ skipping 7704 matching lines @@
   if (break_point_objects()->IsUndefined()) return 0;
   // Single beak point.
   if (!break_point_objects()->IsFixedArray()) return 1;
   // Multiple break points.
   return FixedArray::cast(break_point_objects())->length();
 }
 #endif
 
 
 } }  // namespace v8::internal