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      1 // Copyright 2018 the V8 project authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef V8_OBJECTS_PROTOTYPE_INFO_INL_H_
      6 #define V8_OBJECTS_PROTOTYPE_INFO_INL_H_
      7 
      8 #include "src/objects/prototype-info.h"
      9 
     10 #include "src/heap/heap-write-barrier-inl.h"
     11 #include "src/objects/map.h"
     12 #include "src/objects/maybe-object.h"
     13 
     14 // Has to be the last include (doesn't have include guards):
     15 #include "src/objects/object-macros.h"
     16 
     17 namespace v8 {
     18 namespace internal {
     19 
     20 CAST_ACCESSOR(PrototypeInfo)
     21 
     22 Map* PrototypeInfo::ObjectCreateMap() {
     23   return Map::cast(object_create_map()->ToWeakHeapObject());
     24 }
     25 
     26 // static
     27 void PrototypeInfo::SetObjectCreateMap(Handle<PrototypeInfo> info,
     28                                        Handle<Map> map) {
     29   info->set_object_create_map(HeapObjectReference::Weak(*map));
     30 }
     31 
     32 bool PrototypeInfo::HasObjectCreateMap() {
     33   MaybeObject* cache = object_create_map();
     34   return cache->IsWeakHeapObject();
     35 }
     36 
     37 ACCESSORS(PrototypeInfo, module_namespace, Object, kJSModuleNamespaceOffset)
     38 ACCESSORS(PrototypeInfo, prototype_users, Object, kPrototypeUsersOffset)
     39 WEAK_ACCESSORS(PrototypeInfo, object_create_map, kObjectCreateMapOffset)
     40 SMI_ACCESSORS(PrototypeInfo, registry_slot, kRegistrySlotOffset)
     41 SMI_ACCESSORS(PrototypeInfo, bit_field, kBitFieldOffset)
     42 BOOL_ACCESSORS(PrototypeInfo, bit_field, should_be_fast_map, kShouldBeFastBit)
     43 
     44 void PrototypeUsers::MarkSlotEmpty(WeakArrayList* array, int index) {
     45   DCHECK_GT(index, 0);
     46   DCHECK_LT(index, array->length());
     47   // Chain the empty slots into a linked list (each empty slot contains the
     48   // index of the next empty slot).
     49   array->Set(index, MaybeObject::FromObject(empty_slot_index(array)));
     50   set_empty_slot_index(array, index);
     51 }
     52 
     53 Smi* PrototypeUsers::empty_slot_index(WeakArrayList* array) {
     54   return array->Get(kEmptySlotIndex)->ToSmi();
     55 }
     56 
     57 void PrototypeUsers::set_empty_slot_index(WeakArrayList* array, int index) {
     58   array->Set(kEmptySlotIndex, MaybeObject::FromObject(Smi::FromInt(index)));
     59 }
     60 
     61 }  // namespace internal
     62 }  // namespace v8
     63 
     64 #include "src/objects/object-macros-undef.h"
     65 
     66 #endif  // V8_OBJECTS_PROTOTYPE_INFO_INL_H_
     67