Cache Object.create maps on the passed prototype's PrototypeInfo

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 5468 matching lines @@
 ACCESSORS(AccessorInfo, expected_receiver_type, Object,
           kExpectedReceiverTypeOffset)
 
 ACCESSORS(AccessorInfo, getter, Object, kGetterOffset)
 ACCESSORS(AccessorInfo, setter, Object, kSetterOffset)
 ACCESSORS(AccessorInfo, js_getter, Object, kJsGetterOffset)
 ACCESSORS(AccessorInfo, data, Object, kDataOffset)
 
 ACCESSORS(Box, value, Object, kValueOffset)
 
+Map* PrototypeInfo::ObjectCreateMap() {
+  return Map::cast(WeakCell::cast(object_create_map())->value());
+}
+
+// static
+void PrototypeInfo::SetObjectCreateMap(Handle<PrototypeInfo> info,
+                                       Handle<Map> map) {
+  Handle<WeakCell> cell = Map::WeakCellForMap(map);
+  info->set_object_create_map(*cell);
+}
+
+bool PrototypeInfo::HasObjectCreateMap() {
+  Object* cache = object_create_map();
+  return cache->IsWeakCell() && !WeakCell::cast(cache)->cleared();
+}
+
 ACCESSORS(PrototypeInfo, prototype_users, Object, kPrototypeUsersOffset)
+ACCESSORS(PrototypeInfo, object_create_map, Object, kObjectCreateMap)
 SMI_ACCESSORS(PrototypeInfo, registry_slot, kRegistrySlotOffset)
 ACCESSORS(PrototypeInfo, validity_cell, Object, kValidityCellOffset)
 SMI_ACCESSORS(PrototypeInfo, bit_field, kBitFieldOffset)
 BOOL_ACCESSORS(PrototypeInfo, bit_field, should_be_fast_map, kShouldBeFastBit)
 
 ACCESSORS(SloppyBlockWithEvalContextExtension, scope_info, ScopeInfo,
           kScopeInfoOffset)
 ACCESSORS(SloppyBlockWithEvalContextExtension, extension, JSObject,
           kExtensionOffset)
 
@@ skipping 2430 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_