Move prototype metadata from internal properties to prototype maps

src/transitions.cc

 // 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.
 
 #include "src/v8.h"
 
 #include "src/objects.h"
 #include "src/transitions-inl.h"
 #include "src/utils.h"
 
@@ skipping 298 matching lines @@
   DCHECK(proto_transitions->length() != 0);
   proto_transitions->set(kProtoTransitionNumberOfEntriesOffset,
                          Smi::FromInt(value));
 }
 
 
 // static
 int TransitionArray::NumberOfTransitions(Object* raw_transitions) {
   if (CanStoreSimpleTransition(raw_transitions)) return 0;
   if (IsSimpleTransition(raw_transitions)) return 1;
+  // Prototype maps don't have transitions.
+  if (raw_transitions->IsPrototypeInfo()) return 0;
   DCHECK(IsFullTransitionArray(raw_transitions));
   return TransitionArray::cast(raw_transitions)->number_of_transitions();
 }
 
 
 // static
 int TransitionArray::Capacity(Object* raw_transitions) {
   if (!IsFullTransitionArray(raw_transitions)) return 1;
   TransitionArray* t = TransitionArray::cast(raw_transitions);
   if (t->length() <= kFirstIndex) return 0;
@@ skipping 176 matching lines @@
 int TransitionArray::Search(PropertyKind kind, Name* name,
                             PropertyAttributes attributes,
                             int* out_insertion_index) {
   int transition = SearchName(name, out_insertion_index);
   if (transition == kNotFound) {
     return kNotFound;
   }
   return SearchDetails(transition, kind, attributes, out_insertion_index);
 }
 } }  // namespace v8::internal