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.
//

#ifndef V8_OBJECTS_INL_H_
#define V8_OBJECTS_INL_H_

#include "src/objects.h"

#include "src/base/bits.h"
#include "src/base/tsan.h"
#include "src/builtins/builtins.h"
#include "src/contexts-inl.h"
#include "src/conversions-inl.h"
#include "src/feedback-vector-inl.h"
#include "src/field-index-inl.h"
#include "src/handles-inl.h"
#include "src/heap/factory.h"
#include "src/heap/heap-inl.h"  // crbug.com/v8/8499
#include "src/isolate-inl.h"
#include "src/keys.h"
#include "src/layout-descriptor-inl.h"
#include "src/lookup-cache-inl.h"
#include "src/lookup-inl.h"
#include "src/maybe-handles-inl.h"
#include "src/objects/bigint.h"
#include "src/objects/descriptor-array.h"
#include "src/objects/embedder-data-array-inl.h"
#include "src/objects/js-proxy-inl.h"
#include "src/objects/literal-objects.h"
#include "src/objects/maybe-object-inl.h"
#include "src/objects/regexp-match-info.h"
#include "src/objects/scope-info.h"
#include "src/objects/slots-inl.h"
#include "src/objects/smi-inl.h"
#include "src/objects/template-objects.h"
#include "src/objects/templates.h"
#include "src/property-details.h"
#include "src/property.h"
#include "src/prototype-inl.h"
#include "src/roots-inl.h"
#include "src/transitions-inl.h"
#include "src/v8memory.h"

// Has to be the last include (doesn't have include guards):
#include "src/objects/object-macros.h"

namespace v8 {
namespace internal {

PropertyDetails::PropertyDetails(Smi smi) { value_ = smi->value(); }

Smi PropertyDetails::AsSmi() const {
  // Ensure the upper 2 bits have the same value by sign extending it. This is
  // necessary to be able to use the 31st bit of the property details.
  int value = value_ << 1;
  return Smi::FromInt(value >> 1);
}


int PropertyDetails::field_width_in_words() const {
  DCHECK_EQ(location(), kField);
  if (!FLAG_unbox_double_fields) return 1;
  if (kDoubleSize == kPointerSize) return 1;
  return representation().IsDouble() ? kDoubleSize / kPointerSize : 1;
}

bool HeapObject::IsUncompiledData() const {
  return IsUncompiledDataWithoutPreParsedScope() ||
         IsUncompiledDataWithPreParsedScope();
}

bool HeapObject::IsSloppyArgumentsElements() const {
  return IsFixedArrayExact();
}

bool HeapObject::IsJSSloppyArgumentsObject() const {
  return IsJSArgumentsObject();
}

bool HeapObject::IsJSGeneratorObject() const {
  return map()->instance_type() == JS_GENERATOR_OBJECT_TYPE ||
         IsJSAsyncFunctionObject() || IsJSAsyncGeneratorObject();
}

bool HeapObject::IsDataHandler() const {
  return IsLoadHandler() || IsStoreHandler();
}

bool HeapObject::IsClassBoilerplate() const { return IsFixedArrayExact(); }

bool HeapObject::IsExternal(Isolate* isolate) const {
  return map()->FindRootMap(isolate) == isolate->heap()->external_map();
}

#define IS_TYPE_FUNCTION_DEF(type_)                               \
  bool Object::Is##type_() const {                                \
    return IsHeapObject() && HeapObject::cast(this)->Is##type_(); \
  }
HEAP_OBJECT_TYPE_LIST(IS_TYPE_FUNCTION_DEF)
#undef IS_TYPE_FUNCTION_DEF

#define IS_TYPE_FUNCTION_DEF(Type, Value)                        \
  bool Object::Is##Type(Isolate* isolate) const {                \
    return Is##Type(ReadOnlyRoots(isolate->heap()));             \
  }                                                              \
  bool Object::Is##Type(ReadOnlyRoots roots) const {             \
    return this == roots.Value();                                \
  }                                                              \
  bool Object::Is##Type() const {                                \
    return IsHeapObject() && HeapObject::cast(this)->Is##Type(); \
  }                                                              \
  bool HeapObject::Is##Type(Isolate* isolate) const {            \
    return Object::Is##Type(isolate);                            \
  }                                                              \
  bool HeapObject::Is##Type(ReadOnlyRoots roots) const {         \
    return Object::Is##Type(roots);                              \
  }                                                              \
  bool HeapObject::Is##Type() const { return Is##Type(GetReadOnlyRoots()); }
ODDBALL_LIST(IS_TYPE_FUNCTION_DEF)
#undef IS_TYPE_FUNCTION_DEF

bool Object::IsNullOrUndefined(Isolate* isolate) const {
  return IsNullOrUndefined(ReadOnlyRoots(isolate));
}

bool Object::IsNullOrUndefined(ReadOnlyRoots roots) const {
  return IsNull(roots) || IsUndefined(roots);
}

bool Object::IsNullOrUndefined() const {
  return IsHeapObject() && HeapObject::cast(this)->IsNullOrUndefined();
}

bool HeapObject::IsNullOrUndefined(Isolate* isolate) const {
  return Object::IsNullOrUndefined(isolate);
}

bool HeapObject::IsNullOrUndefined(ReadOnlyRoots roots) const {
  return Object::IsNullOrUndefined(roots);
}

bool HeapObject::IsNullOrUndefined() const {
  return IsNullOrUndefined(GetReadOnlyRoots());
}

bool HeapObject::IsUniqueName() const {
  return IsInternalizedString() || IsSymbol();
}

bool HeapObject::IsFunction() const {
  STATIC_ASSERT(LAST_FUNCTION_TYPE == LAST_TYPE);
  return map()->instance_type() >= FIRST_FUNCTION_TYPE;
}

bool HeapObject::IsCallable() const { return map()->is_callable(); }

bool HeapObject::IsConstructor() const { return map()->is_constructor(); }

bool HeapObject::IsModuleInfo() const {
  return map() == GetReadOnlyRoots().module_info_map();
}

bool HeapObject::IsTemplateInfo() const {
  return IsObjectTemplateInfo() || IsFunctionTemplateInfo();
}

bool HeapObject::IsConsString() const {
  if (!IsString()) return false;
  return StringShape(String::cast(this)).IsCons();
}

bool HeapObject::IsThinString() const {
  if (!IsString()) return false;
  return StringShape(String::cast(this)).IsThin();
}

bool HeapObject::IsSlicedString() const {
  if (!IsString()) return false;
  return StringShape(String::cast(this)).IsSliced();
}

bool HeapObject::IsSeqString() const {
  if (!IsString()) return false;
  return StringShape(String::cast(this)).IsSequential();
}

bool HeapObject::IsSeqOneByteString() const {
  if (!IsString()) return false;
  return StringShape(String::cast(this)).IsSequential() &&
         String::cast(this)->IsOneByteRepresentation();
}

bool HeapObject::IsSeqTwoByteString() const {
  if (!IsString()) return false;
  return StringShape(String::cast(this)).IsSequential() &&
         String::cast(this)->IsTwoByteRepresentation();
}

bool HeapObject::IsExternalString() const {
  if (!IsString()) return false;
  return StringShape(String::cast(this)).IsExternal();
}

bool HeapObject::IsExternalOneByteString() const {
  if (!IsString()) return false;
  return StringShape(String::cast(this)).IsExternal() &&
         String::cast(this)->IsOneByteRepresentation();
}

bool HeapObject::IsExternalTwoByteString() const {
  if (!IsString()) return false;
  return StringShape(String::cast(this)).IsExternal() &&
         String::cast(this)->IsTwoByteRepresentation();
}

bool Object::IsNumber() const { return IsSmi() || IsHeapNumber(); }

bool Object::IsNumeric() const { return IsNumber() || IsBigInt(); }

bool HeapObject::IsFiller() const {
  InstanceType instance_type = map()->instance_type();
  return instance_type == FREE_SPACE_TYPE || instance_type == FILLER_TYPE;
}

bool HeapObject::IsJSWeakCollection() const {
  return IsJSWeakMap() || IsJSWeakSet();
}

bool HeapObject::IsJSCollection() const { return IsJSMap() || IsJSSet(); }

bool HeapObject::IsPromiseReactionJobTask() const {
  return IsPromiseFulfillReactionJobTask() || IsPromiseRejectReactionJobTask();
}

bool HeapObject::IsEnumCache() const { return IsTuple2(); }

bool HeapObject::IsFrameArray() const { return IsFixedArrayExact(); }

bool HeapObject::IsArrayList() const {
  return map() == GetReadOnlyRoots().array_list_map() ||
         this == GetReadOnlyRoots().empty_fixed_array();
}

bool HeapObject::IsRegExpMatchInfo() const { return IsFixedArrayExact(); }

bool Object::IsLayoutDescriptor() const { return IsSmi() || IsByteArray(); }

bool HeapObject::IsDeoptimizationData() const {
  // Must be a fixed array.
  if (!IsFixedArrayExact()) return false;

  // There's no sure way to detect the difference between a fixed array and
  // a deoptimization data array.  Since this is used for asserts we can
  // check that the length is zero or else the fixed size plus a multiple of
  // the entry size.
  int length = FixedArray::cast(this)->length();
  if (length == 0) return true;

  length -= DeoptimizationData::kFirstDeoptEntryIndex;
  return length >= 0 && length % DeoptimizationData::kDeoptEntrySize == 0;
}

bool HeapObject::IsHandlerTable() const {
  if (!IsFixedArrayExact()) return false;
  // There's actually no way to see the difference between a fixed array and
  // a handler table array.
  return true;
}

bool HeapObject::IsTemplateList() const {
  if (!IsFixedArrayExact()) return false;
  // There's actually no way to see the difference between a fixed array and
  // a template list.
  if (FixedArray::cast(this)->length() < 1) return false;
  return true;
}

bool HeapObject::IsDependentCode() const {
  if (!IsWeakFixedArray()) return false;
  // There's actually no way to see the difference between a weak fixed array
  // and a dependent codes array.
  return true;
}

bool HeapObject::IsAbstractCode() const {
  return IsBytecodeArray() || IsCode();
}

bool HeapObject::IsStringWrapper() const {
  return IsJSValue() && JSValue::cast(this)->value()->IsString();
}

bool HeapObject::IsBooleanWrapper() const {
  return IsJSValue() && JSValue::cast(this)->value()->IsBoolean();
}

bool HeapObject::IsScriptWrapper() const {
  return IsJSValue() && JSValue::cast(this)->value()->IsScript();
}

bool HeapObject::IsNumberWrapper() const {
  return IsJSValue() && JSValue::cast(this)->value()->IsNumber();
}

bool HeapObject::IsBigIntWrapper() const {
  return IsJSValue() && JSValue::cast(this)->value()->IsBigInt();
}

bool HeapObject::IsSymbolWrapper() const {
  return IsJSValue() && JSValue::cast(this)->value()->IsSymbol();
}

bool HeapObject::IsBoolean() const {
  return IsOddball() &&
         ((Oddball::cast(this)->kind() & Oddball::kNotBooleanMask) == 0);
}

bool HeapObject::IsJSArrayBufferView() const {
  return IsJSDataView() || IsJSTypedArray();
}

bool HeapObject::IsStringSet() const { return IsHashTable(); }

bool HeapObject::IsObjectHashSet() const { return IsHashTable(); }

bool HeapObject::IsNormalizedMapCache() const {
  return NormalizedMapCache::IsNormalizedMapCache(this);
}

bool HeapObject::IsCompilationCacheTable() const { return IsHashTable(); }

bool HeapObject::IsMapCache() const { return IsHashTable(); }

bool HeapObject::IsObjectHashTable() const { return IsHashTable(); }

bool Object::IsSmallOrderedHashTable() const {
  return IsSmallOrderedHashSet() || IsSmallOrderedHashMap() ||
         IsSmallOrderedNameDictionary();
}

bool Object::IsPrimitive() const {
  return IsSmi() || HeapObject::cast(this)->map()->IsPrimitiveMap();
}

// static
Maybe<bool> Object::IsArray(Handle<Object> object) {
  if (object->IsSmi()) return Just(false);
  Handle<HeapObject> heap_object = Handle<HeapObject>::cast(object);
  if (heap_object->IsJSArray()) return Just(true);
  if (!heap_object->IsJSProxy()) return Just(false);
  return JSProxy::IsArray(Handle<JSProxy>::cast(object));
}

bool HeapObject::IsUndetectable() const { return map()->is_undetectable(); }

bool HeapObject::IsAccessCheckNeeded() const {
  if (IsJSGlobalProxy()) {
    const JSGlobalProxy* proxy = JSGlobalProxy::cast(this);
    JSGlobalObject* global = proxy->GetIsolate()->context()->global_object();
    return proxy->IsDetachedFrom(global);
  }
  return map()->is_access_check_needed();
}

bool HeapObject::IsStruct() const {
  switch (map()->instance_type()) {
#define MAKE_STRUCT_CASE(TYPE, Name, name) \
  case TYPE:                               \
    return true;
    STRUCT_LIST(MAKE_STRUCT_CASE)
#undef MAKE_STRUCT_CASE
    default:
      return false;
  }
}

#define MAKE_STRUCT_PREDICATE(NAME, Name, name)                  \
  bool Object::Is##Name() const {                                \
    return IsHeapObject() && HeapObject::cast(this)->Is##Name(); \
  }                                                              \
  TYPE_CHECKER(Name)
STRUCT_LIST(MAKE_STRUCT_PREDICATE)
#undef MAKE_STRUCT_PREDICATE

double Object::Number() const {
  DCHECK(IsNumber());
  return IsSmi() ? static_cast<double>(Smi(this->ptr())->value())
                 : reinterpret_cast<const HeapNumber*>(this)->value();
}

bool Object::IsNaN() const {
  return this->IsHeapNumber() && std::isnan(HeapNumber::cast(this)->value());
}

bool Object::IsMinusZero() const {
  return this->IsHeapNumber() &&
         i::IsMinusZero(HeapNumber::cast(this)->value());
}

OBJECT_CONSTRUCTORS_IMPL(HashTableBase, FixedArray)

template <typename Derived, typename Shape>
HashTable<Derived, Shape>::HashTable(Address ptr) : HashTableBase(ptr) {
  SLOW_DCHECK(IsHashTable());
}

template <typename Derived, typename Shape>
ObjectHashTableBase<Derived, Shape>::ObjectHashTableBase(Address ptr)
    : HashTable<Derived, Shape>(ptr) {}

ObjectHashTable::ObjectHashTable(Address ptr)
    : ObjectHashTableBase<ObjectHashTable, ObjectHashTableShape>(ptr) {
  SLOW_DCHECK(IsObjectHashTable());
}

EphemeronHashTable::EphemeronHashTable(Address ptr)
    : ObjectHashTableBase<EphemeronHashTable, EphemeronHashTableShape>(ptr) {
  SLOW_DCHECK(IsEphemeronHashTable());
}

ObjectHashSet::ObjectHashSet(Address ptr)
    : HashTable<ObjectHashSet, ObjectHashSetShape>(ptr) {
  SLOW_DCHECK(IsObjectHashSet());
}

template <typename Derived, typename Shape>
Dictionary<Derived, Shape>::Dictionary(Address ptr)
    : HashTable<Derived, Shape>(ptr) {}

template <typename Derived, typename Shape>
BaseNameDictionary<Derived, Shape>::BaseNameDictionary(Address ptr)
    : Dictionary<Derived, Shape>(ptr) {}

GlobalDictionary::GlobalDictionary(Address ptr)
    : BaseNameDictionary<GlobalDictionary, GlobalDictionaryShape>(ptr) {
  SLOW_DCHECK(IsGlobalDictionary());
}

NameDictionary::NameDictionary(Address ptr)
    : BaseNameDictionary<NameDictionary, NameDictionaryShape>(ptr) {
  SLOW_DCHECK(IsNameDictionary());
}

NumberDictionary::NumberDictionary(Address ptr)
    : Dictionary<NumberDictionary, NumberDictionaryShape>(ptr) {
  SLOW_DCHECK(IsNumberDictionary());
}

SimpleNumberDictionary::SimpleNumberDictionary(Address ptr)
    : Dictionary<SimpleNumberDictionary, SimpleNumberDictionaryShape>(ptr) {
  SLOW_DCHECK(IsSimpleNumberDictionary());
}

StringTable::StringTable(Address ptr)
    : HashTable<StringTable, StringTableShape>(ptr) {
  SLOW_DCHECK(IsStringTable());
}

StringSet::StringSet(Address ptr) : HashTable<StringSet, StringSetShape>(ptr) {
  SLOW_DCHECK(IsStringSet());
}

template <class Derived, int entrysize>
OrderedHashTable<Derived, entrysize>::OrderedHashTable(Address ptr)
    : FixedArray(ptr) {}

OrderedHashSet::OrderedHashSet(Address ptr)
    : OrderedHashTable<OrderedHashSet, 1>(ptr) {
  SLOW_DCHECK(IsOrderedHashSet());
}

OrderedHashMap::OrderedHashMap(Address ptr)
    : OrderedHashTable<OrderedHashMap, 2>(ptr) {
  SLOW_DCHECK(IsOrderedHashMap());
}

OrderedNameDictionary::OrderedNameDictionary(Address ptr)
    : OrderedHashTable<OrderedNameDictionary, 3>(ptr) {
  SLOW_DCHECK(IsOrderedNameDictionary());
}

template <class Derived>
SmallOrderedHashTable<Derived>::SmallOrderedHashTable(Address ptr)
    : HeapObjectPtr(ptr) {}

OBJECT_CONSTRUCTORS_IMPL(SmallOrderedHashSet,
                         SmallOrderedHashTable<SmallOrderedHashSet>)
OBJECT_CONSTRUCTORS_IMPL(SmallOrderedHashMap,
                         SmallOrderedHashTable<SmallOrderedHashMap>)
OBJECT_CONSTRUCTORS_IMPL(SmallOrderedNameDictionary,
                         SmallOrderedHashTable<SmallOrderedNameDictionary>)

OBJECT_CONSTRUCTORS_IMPL(RegExpMatchInfo, FixedArray)
OBJECT_CONSTRUCTORS_IMPL(ScopeInfo, FixedArray)

// ------------------------------------
// Cast operations

CAST_ACCESSOR(AccessorPair)
CAST_ACCESSOR(BigInt)
CAST_ACCESSOR2(ObjectBoilerplateDescription)
CAST_ACCESSOR(Cell)
CAST_ACCESSOR(ArrayBoilerplateDescription)
CAST_ACCESSOR(DataHandler)
CAST_ACCESSOR(DescriptorArray)
CAST_ACCESSOR2(EphemeronHashTable)
CAST_ACCESSOR(EnumCache)
CAST_ACCESSOR(FeedbackCell)
CAST_ACCESSOR(Foreign)
CAST_ACCESSOR2(GlobalDictionary)
CAST_ACCESSOR(HeapObject)
CAST_ACCESSOR(HeapNumber)
CAST_ACCESSOR(MutableHeapNumber)
CAST_ACCESSOR2(OrderedNameDictionary)
CAST_ACCESSOR2(NameDictionary)
CAST_ACCESSOR(NormalizedMapCache)
CAST_ACCESSOR2(NumberDictionary)
CAST_ACCESSOR(Object)
CAST_ACCESSOR2(ObjectHashSet)
CAST_ACCESSOR2(ObjectHashTable)
CAST_ACCESSOR(Oddball)
CAST_ACCESSOR2(OrderedHashMap)
CAST_ACCESSOR2(OrderedHashSet)
CAST_ACCESSOR(PropertyCell)
CAST_ACCESSOR2(RegExpMatchInfo)
CAST_ACCESSOR2(ScopeInfo)
CAST_ACCESSOR2(SimpleNumberDictionary)
CAST_ACCESSOR2(SmallOrderedHashMap)
CAST_ACCESSOR2(SmallOrderedHashSet)
CAST_ACCESSOR2(SmallOrderedNameDictionary)
CAST_ACCESSOR2(StringSet)
CAST_ACCESSOR2(StringTable)
CAST_ACCESSOR(Struct)
CAST_ACCESSOR(TemplateObjectDescription)
CAST_ACCESSOR(Tuple2)
CAST_ACCESSOR(Tuple3)

bool Object::HasValidElements() {
  // Dictionary is covered under FixedArray.
  return IsFixedArray() || IsFixedDoubleArray() || IsFixedTypedArrayBase();
}

bool Object::KeyEquals(Object* second) {
  Object* first = this;
  if (second->IsNumber()) {
    if (first->IsNumber()) return first->Number() == second->Number();
    Object* temp = first;
    first = second;
    second = temp;
  }
  if (first->IsNumber()) {
    DCHECK_LE(0, first->Number());
    uint32_t expected = static_cast<uint32_t>(first->Number());
    uint32_t index;
    return Name::cast(second)->AsArrayIndex(&index) && index == expected;
  }
  return Name::cast(first)->Equals(Name::cast(second));
}

bool Object::FilterKey(PropertyFilter filter) {
  DCHECK(!IsPropertyCell());
  if (IsSymbol()) {
    if (filter & SKIP_SYMBOLS) return true;
    if (Symbol::cast(this)->is_private()) return true;
  } else {
    if (filter & SKIP_STRINGS) return true;
  }
  return false;
}

Handle<Object> Object::NewStorageFor(Isolate* isolate, Handle<Object> object,
                                     Representation representation) {
  if (!representation.IsDouble()) return object;
  auto result = isolate->factory()->NewMutableHeapNumberWithHoleNaN();
  if (object->IsUninitialized(isolate)) {
    result->set_value_as_bits(kHoleNanInt64);
  } else if (object->IsMutableHeapNumber()) {
    // Ensure that all bits of the double value are preserved.
    result->set_value_as_bits(
        MutableHeapNumber::cast(*object)->value_as_bits());
  } else {
    result->set_value(object->Number());
  }
  return result;
}

Handle<Object> Object::WrapForRead(Isolate* isolate, Handle<Object> object,
                                   Representation representation) {
  DCHECK(!object->IsUninitialized(isolate));
  if (!representation.IsDouble()) {
    DCHECK(object->FitsRepresentation(representation));
    return object;
  }
  return isolate->factory()->NewHeapNumber(
      MutableHeapNumber::cast(*object)->value());
}

Representation Object::OptimalRepresentation() {
  if (!FLAG_track_fields) return Representation::Tagged();
  if (IsSmi()) {
    return Representation::Smi();
  } else if (FLAG_track_double_fields && IsHeapNumber()) {
    return Representation::Double();
  } else if (FLAG_track_computed_fields && IsUninitialized()) {
    return Representation::None();
  } else if (FLAG_track_heap_object_fields) {
    DCHECK(IsHeapObject());
    return Representation::HeapObject();
  } else {
    return Representation::Tagged();
  }
}


ElementsKind Object::OptimalElementsKind() {
  if (IsSmi()) return PACKED_SMI_ELEMENTS;
  if (IsNumber()) return PACKED_DOUBLE_ELEMENTS;
  return PACKED_ELEMENTS;
}


bool Object::FitsRepresentation(Representation representation) {
  if (FLAG_track_fields && representation.IsSmi()) {
    return IsSmi();
  } else if (FLAG_track_double_fields && representation.IsDouble()) {
    return IsMutableHeapNumber() || IsNumber();
  } else if (FLAG_track_heap_object_fields && representation.IsHeapObject()) {
    return IsHeapObject();
  } else if (FLAG_track_fields && representation.IsNone()) {
    return false;
  }
  return true;
}

bool Object::ToUint32(uint32_t* value) const {
  if (IsSmi()) {
    int num = Smi::ToInt(this);
    if (num < 0) return false;
    *value = static_cast<uint32_t>(num);
    return true;
  }
  if (IsHeapNumber()) {
    double num = HeapNumber::cast(this)->value();
    return DoubleToUint32IfEqualToSelf(num, value);
  }
  return false;
}

// static
MaybeHandle<JSReceiver> Object::ToObject(Isolate* isolate,
                                         Handle<Object> object,
                                         const char* method_name) {
  if (object->IsJSReceiver()) return Handle<JSReceiver>::cast(object);
  return ToObject(isolate, object, isolate->native_context(), method_name);
}


// static
MaybeHandle<Name> Object::ToName(Isolate* isolate, Handle<Object> input) {
  if (input->IsName()) return Handle<Name>::cast(input);
  return ConvertToName(isolate, input);
}

// static
MaybeHandle<Object> Object::ToPropertyKey(Isolate* isolate,
                                          Handle<Object> value) {
  if (value->IsSmi() || HeapObject::cast(*value)->IsName()) return value;
  return ConvertToPropertyKey(isolate, value);
}

// static
MaybeHandle<Object> Object::ToPrimitive(Handle<Object> input,
                                        ToPrimitiveHint hint) {
  if (input->IsPrimitive()) return input;
  return JSReceiver::ToPrimitive(Handle<JSReceiver>::cast(input), hint);
}

// static
MaybeHandle<Object> Object::ToNumber(Isolate* isolate, Handle<Object> input) {
  if (input->IsNumber()) return input;  // Shortcut.
  return ConvertToNumberOrNumeric(isolate, input, Conversion::kToNumber);
}

// static
MaybeHandle<Object> Object::ToNumeric(Isolate* isolate, Handle<Object> input) {
  if (input->IsNumber() || input->IsBigInt()) return input;  // Shortcut.
  return ConvertToNumberOrNumeric(isolate, input, Conversion::kToNumeric);
}

// static
MaybeHandle<Object> Object::ToInteger(Isolate* isolate, Handle<Object> input) {
  if (input->IsSmi()) return input;
  return ConvertToInteger(isolate, input);
}

// static
MaybeHandle<Object> Object::ToInt32(Isolate* isolate, Handle<Object> input) {
  if (input->IsSmi()) return input;
  return ConvertToInt32(isolate, input);
}

// static
MaybeHandle<Object> Object::ToUint32(Isolate* isolate, Handle<Object> input) {
  if (input->IsSmi()) return handle(Smi::cast(*input)->ToUint32Smi(), isolate);
  return ConvertToUint32(isolate, input);
}

// static
MaybeHandle<String> Object::ToString(Isolate* isolate, Handle<Object> input) {
  if (input->IsString()) return Handle<String>::cast(input);
  return ConvertToString(isolate, input);
}

// static
MaybeHandle<Object> Object::ToLength(Isolate* isolate, Handle<Object> input) {
  if (input->IsSmi()) {
    int value = std::max(Smi::ToInt(*input), 0);
    return handle(Smi::FromInt(value), isolate);
  }
  return ConvertToLength(isolate, input);
}

// static
MaybeHandle<Object> Object::ToIndex(Isolate* isolate, Handle<Object> input,
                                    MessageTemplate error_index) {
  if (input->IsSmi() && Smi::ToInt(*input) >= 0) return input;
  return ConvertToIndex(isolate, input, error_index);
}

MaybeHandle<Object> Object::GetProperty(Isolate* isolate, Handle<Object> object,
                                        Handle<Name> name) {
  LookupIterator it(isolate, object, name);
  if (!it.IsFound()) return it.factory()->undefined_value();
  return GetProperty(&it);
}

MaybeHandle<Object> Object::GetElement(Isolate* isolate, Handle<Object> object,
                                       uint32_t index) {
  LookupIterator it(isolate, object, index);
  if (!it.IsFound()) return it.factory()->undefined_value();
  return GetProperty(&it);
}

MaybeHandle<Object> Object::SetElement(Isolate* isolate, Handle<Object> object,
                                       uint32_t index, Handle<Object> value,
                                       LanguageMode language_mode) {
  LookupIterator it(isolate, object, index);
  MAYBE_RETURN_NULL(
      SetProperty(&it, value, language_mode, StoreOrigin::kMaybeKeyed));
  return value;
}

ObjectSlot HeapObject::RawField(int byte_offset) const {
  return ObjectSlot(FIELD_ADDR(this, byte_offset));
}

ObjectSlot HeapObject::RawField(const HeapObject* obj, int byte_offset) {
  return ObjectSlot(FIELD_ADDR(obj, byte_offset));
}

MaybeObjectSlot HeapObject::RawMaybeWeakField(int byte_offset) const {
  return MaybeObjectSlot(FIELD_ADDR(this, byte_offset));
}

MaybeObjectSlot HeapObject::RawMaybeWeakField(HeapObject* obj,
                                              int byte_offset) {
  return MaybeObjectSlot(FIELD_ADDR(obj, byte_offset));
}

MapWord MapWord::FromMap(const Map map) { return MapWord(map.ptr()); }

Map MapWord::ToMap() const { return Map::unchecked_cast(ObjectPtr(value_)); }

bool MapWord::IsForwardingAddress() const { return HAS_SMI_TAG(value_); }

MapWord MapWord::FromForwardingAddress(HeapObject* object) {
  return MapWord(object->ptr() - kHeapObjectTag);
}


HeapObject* MapWord::ToForwardingAddress() {
  DCHECK(IsForwardingAddress());
  return HeapObject::FromAddress(value_);
}


#ifdef VERIFY_HEAP
void HeapObject::VerifyObjectField(Isolate* isolate, int offset) {
  VerifyPointer(isolate, READ_FIELD(this, offset));
}

void HeapObject::VerifyMaybeObjectField(Isolate* isolate, int offset) {
  MaybeObject::VerifyMaybeObjectPointer(isolate, READ_WEAK_FIELD(this, offset));
}

void HeapObject::VerifySmiField(int offset) {
  CHECK(READ_FIELD(this, offset)->IsSmi());
}

void HeapObjectPtr::VerifyObjectField(Isolate* isolate, int offset) {
  Object::VerifyPointer(isolate, READ_FIELD(this, offset));
}

void HeapObjectPtr::VerifyMaybeObjectField(Isolate* isolate, int offset) {
  MaybeObject::VerifyMaybeObjectPointer(isolate, READ_WEAK_FIELD(this, offset));
}

void HeapObjectPtr::VerifySmiField(int offset) {
  CHECK(READ_FIELD(this, offset)->IsSmi());
}

#endif

ReadOnlyRoots HeapObject::GetReadOnlyRoots() const {
  // TODO(v8:7464): When RO_SPACE is embedded, this will access a global
  // variable instead.
  return ReadOnlyRoots(MemoryChunk::FromHeapObject(this)->heap());
}

Heap* NeverReadOnlySpaceObject::GetHeap() const {
  MemoryChunk* chunk =
      MemoryChunk::FromAddress(reinterpret_cast<Address>(this));
  // Make sure we are not accessing an object in RO space.
  SLOW_DCHECK(chunk->owner()->identity() != RO_SPACE);
  Heap* heap = chunk->heap();
  SLOW_DCHECK(heap != nullptr);
  return heap;
}

Isolate* NeverReadOnlySpaceObject::GetIsolate() const {
  return GetHeap()->isolate();
}

Map HeapObject::map() const { return map_word().ToMap(); }

void HeapObject::set_map(Map value) {
  if (!value.is_null()) {
#ifdef VERIFY_HEAP
    Heap::FromWritableHeapObject(this)->VerifyObjectLayoutChange(this, value);
#endif
  }
  set_map_word(MapWord::FromMap(value));
  if (!value.is_null()) {
    // TODO(1600) We are passing kNullAddress as a slot because maps can never
    // be on an evacuation candidate.
    MarkingBarrier(this, ObjectSlot(kNullAddress), value);
  }
}

Map HeapObject::synchronized_map() const {
  return synchronized_map_word().ToMap();
}

void HeapObject::synchronized_set_map(Map value) {
  if (!value.is_null()) {
#ifdef VERIFY_HEAP
    Heap::FromWritableHeapObject(this)->VerifyObjectLayoutChange(this, value);
#endif
  }
  synchronized_set_map_word(MapWord::FromMap(value));
  if (!value.is_null()) {
    // TODO(1600) We are passing kNullAddress as a slot because maps can never
    // be on an evacuation candidate.
    MarkingBarrier(this, ObjectSlot(kNullAddress), value);
  }
}


// Unsafe accessor omitting write barrier.
void HeapObject::set_map_no_write_barrier(Map value) {
  if (!value.is_null()) {
#ifdef VERIFY_HEAP
    Heap::FromWritableHeapObject(this)->VerifyObjectLayoutChange(this, value);
#endif
  }
  set_map_word(MapWord::FromMap(value));
}

void HeapObject::set_map_after_allocation(Map value, WriteBarrierMode mode) {
  set_map_word(MapWord::FromMap(value));
  if (mode != SKIP_WRITE_BARRIER) {
    DCHECK(!value.is_null());
    // TODO(1600) We are passing kNullAddress as a slot because maps can never
    // be on an evacuation candidate.
    MarkingBarrier(this, ObjectSlot(kNullAddress), value);
  }
}

ObjectSlot HeapObject::map_slot() {
  return ObjectSlot(FIELD_ADDR(this, kMapOffset));
}

MapWord HeapObject::map_word() const {
  return MapWord(RELAXED_READ_FIELD(this, kMapOffset).ptr());
}

void HeapObject::set_map_word(MapWord map_word) {
  RELAXED_WRITE_FIELD(this, kMapOffset,
                      reinterpret_cast<Object*>(map_word.value_));
}


MapWord HeapObject::synchronized_map_word() const {
  return MapWord(
      reinterpret_cast<Address>(ACQUIRE_READ_FIELD(this, kMapOffset)));
}


void HeapObject::synchronized_set_map_word(MapWord map_word) {
  RELEASE_WRITE_FIELD(
      this, kMapOffset, reinterpret_cast<Object*>(map_word.value_));
}

int HeapObject::Size() const { return SizeFromMap(map()); }

double HeapNumberBase::value() const {
  return READ_DOUBLE_FIELD(this, kValueOffset);
}

void HeapNumberBase::set_value(double value) {
  WRITE_DOUBLE_FIELD(this, kValueOffset, value);
}

uint64_t HeapNumberBase::value_as_bits() const {
  return READ_UINT64_FIELD(this, kValueOffset);
}

void HeapNumberBase::set_value_as_bits(uint64_t bits) {
  WRITE_UINT64_FIELD(this, kValueOffset, bits);
}

int HeapNumberBase::get_exponent() {
  return ((READ_INT_FIELD(this, kExponentOffset) & kExponentMask) >>
          kExponentShift) - kExponentBias;
}

int HeapNumberBase::get_sign() {
  return READ_INT_FIELD(this, kExponentOffset) & kSignMask;
}

double Oddball::to_number_raw() const {
  return READ_DOUBLE_FIELD(this, kToNumberRawOffset);
}

void Oddball::set_to_number_raw(double value) {
  WRITE_DOUBLE_FIELD(this, kToNumberRawOffset, value);
}

void Oddball::set_to_number_raw_as_bits(uint64_t bits) {
  WRITE_UINT64_FIELD(this, kToNumberRawOffset, bits);
}

ACCESSORS2(Oddball, to_string, String, kToStringOffset)
ACCESSORS(Oddball, to_number, Object, kToNumberOffset)
ACCESSORS2(Oddball, type_of, String, kTypeOfOffset)

byte Oddball::kind() const { return Smi::ToInt(READ_FIELD(this, kKindOffset)); }

void Oddball::set_kind(byte value) {
  WRITE_FIELD(this, kKindOffset, Smi::FromInt(value));
}


// static
Handle<Object> Oddball::ToNumber(Isolate* isolate, Handle<Oddball> input) {
  return handle(input->to_number(), isolate);
}


ACCESSORS(Cell, value, Object, kValueOffset)
ACCESSORS(FeedbackCell, value, HeapObject, kValueOffset)
ACCESSORS(PropertyCell, dependent_code, DependentCode, kDependentCodeOffset)
ACCESSORS2(PropertyCell, name, Name, kNameOffset)
ACCESSORS(PropertyCell, value, Object, kValueOffset)
ACCESSORS(PropertyCell, property_details_raw, Object, kDetailsOffset)

PropertyDetails PropertyCell::property_details() const {
  return PropertyDetails(Smi::cast(property_details_raw()));
}


void PropertyCell::set_property_details(PropertyDetails details) {
  set_property_details_raw(details.AsSmi());
}

inline bool IsSpecialReceiverInstanceType(InstanceType instance_type) {
  return instance_type <= LAST_SPECIAL_RECEIVER_TYPE;
}

// This should be in objects/map-inl.h, but can't, because of a cyclic
// dependency.
bool Map::IsSpecialReceiverMap() const {
  bool result = IsSpecialReceiverInstanceType(instance_type());
  DCHECK_IMPLIES(!result,
                 !has_named_interceptor() && !is_access_check_needed());
  return result;
}

inline bool IsCustomElementsReceiverInstanceType(InstanceType instance_type) {
  return instance_type <= LAST_CUSTOM_ELEMENTS_RECEIVER;
}

// This should be in objects/map-inl.h, but can't, because of a cyclic
// dependency.
bool Map::IsCustomElementsReceiverMap() const {
  return IsCustomElementsReceiverInstanceType(instance_type());
}

void Struct::InitializeBody(int object_size) {
  Object* value = GetReadOnlyRoots().undefined_value();
  for (int offset = kHeaderSize; offset < object_size; offset += kPointerSize) {
    WRITE_FIELD(this, offset, value);
  }
}

bool Object::ToArrayLength(uint32_t* index) const {
  return Object::ToUint32(index);
}

bool Object::ToArrayIndex(uint32_t* index) const {
  return Object::ToUint32(index) && *index != kMaxUInt32;
}


void Object::VerifyApiCallResultType() {
#if DEBUG
  if (IsSmi()) return;
  DCHECK(IsHeapObject());
  if (!(IsString() || IsSymbol() || IsJSReceiver() || IsHeapNumber() ||
        IsBigInt() || IsUndefined() || IsTrue() || IsFalse() || IsNull())) {
    FATAL("API call returned invalid object");
  }
#endif  // DEBUG
}

int RegExpMatchInfo::NumberOfCaptureRegisters() {
  DCHECK_GE(length(), kLastMatchOverhead);
  Object* obj = get(kNumberOfCapturesIndex);
  return Smi::ToInt(obj);
}

void RegExpMatchInfo::SetNumberOfCaptureRegisters(int value) {
  DCHECK_GE(length(), kLastMatchOverhead);
  set(kNumberOfCapturesIndex, Smi::FromInt(value));
}

String RegExpMatchInfo::LastSubject() {
  DCHECK_GE(length(), kLastMatchOverhead);
  return String::cast(get(kLastSubjectIndex));
}

void RegExpMatchInfo::SetLastSubject(String value) {
  DCHECK_GE(length(), kLastMatchOverhead);
  set(kLastSubjectIndex, value);
}

Object* RegExpMatchInfo::LastInput() {
  DCHECK_GE(length(), kLastMatchOverhead);
  return get(kLastInputIndex);
}

void RegExpMatchInfo::SetLastInput(Object* value) {
  DCHECK_GE(length(), kLastMatchOverhead);
  set(kLastInputIndex, value);
}

int RegExpMatchInfo::Capture(int i) {
  DCHECK_LT(i, NumberOfCaptureRegisters());
  Object* obj = get(kFirstCaptureIndex + i);
  return Smi::ToInt(obj);
}

void RegExpMatchInfo::SetCapture(int i, int value) {
  DCHECK_LT(i, NumberOfCaptureRegisters());
  set(kFirstCaptureIndex + i, Smi::FromInt(value));
}

WriteBarrierMode HeapObject::GetWriteBarrierMode(
    const DisallowHeapAllocation& promise) {
  Heap* heap = Heap::FromWritableHeapObject(this);
  if (heap->incremental_marking()->IsMarking()) return UPDATE_WRITE_BARRIER;
  if (Heap::InNewSpace(this)) return SKIP_WRITE_BARRIER;
  return UPDATE_WRITE_BARRIER;
}

AllocationAlignment HeapObject::RequiredAlignment(Map map) {
#ifdef V8_HOST_ARCH_32_BIT
  int instance_type = map->instance_type();
  if (instance_type == FIXED_FLOAT64_ARRAY_TYPE ||
      instance_type == FIXED_DOUBLE_ARRAY_TYPE) {
    return kDoubleAligned;
  }
  if (instance_type == HEAP_NUMBER_TYPE) return kDoubleUnaligned;
#endif  // V8_HOST_ARCH_32_BIT
  return kWordAligned;
}

bool HeapObject::NeedsRehashing() const {
  switch (map()->instance_type()) {
    case DESCRIPTOR_ARRAY_TYPE:
      return DescriptorArray::cast(this)->number_of_descriptors() > 1;
    case TRANSITION_ARRAY_TYPE:
      return TransitionArray::cast(this)->number_of_entries() > 1;
    case ORDERED_HASH_MAP_TYPE:
      return OrderedHashMap::cast(this)->NumberOfElements() > 0;
    case ORDERED_HASH_SET_TYPE:
      return OrderedHashSet::cast(this)->NumberOfElements() > 0;
    case NAME_DICTIONARY_TYPE:
    case GLOBAL_DICTIONARY_TYPE:
    case NUMBER_DICTIONARY_TYPE:
    case SIMPLE_NUMBER_DICTIONARY_TYPE:
    case STRING_TABLE_TYPE:
    case HASH_TABLE_TYPE:
    case SMALL_ORDERED_HASH_MAP_TYPE:
    case SMALL_ORDERED_HASH_SET_TYPE:
    case SMALL_ORDERED_NAME_DICTIONARY_TYPE:
      return true;
    default:
      return false;
  }
}

Address HeapObject::GetFieldAddress(int field_offset) const {
  return FIELD_ADDR(this, field_offset);
}

ACCESSORS2(EnumCache, keys, FixedArray, kKeysOffset)
ACCESSORS2(EnumCache, indices, FixedArray, kIndicesOffset)

ACCESSORS(DescriptorArray, enum_cache, EnumCache, kEnumCacheOffset)
RELAXED_INT16_ACCESSORS(DescriptorArray, number_of_all_descriptors,
                        kNumberOfAllDescriptorsOffset)
RELAXED_INT16_ACCESSORS(DescriptorArray, number_of_descriptors,
                        kNumberOfDescriptorsOffset)
RELAXED_INT16_ACCESSORS(DescriptorArray, number_of_marked_descriptors,
                        kNumberOfMarkedDescriptorsOffset)
RELAXED_INT16_ACCESSORS(DescriptorArray, filler16bits, kFiller16BitsOffset)

inline int16_t DescriptorArray::number_of_slack_descriptors() const {
  return number_of_all_descriptors() - number_of_descriptors();
}

inline int DescriptorArray::number_of_entries() const {
  return number_of_descriptors();
}

void DescriptorArray::CopyEnumCacheFrom(DescriptorArray* array) {
  set_enum_cache(array->enum_cache());
}

// Perform a binary search in a fixed array.
template <SearchMode search_mode, typename T>
int BinarySearch(T* array, Name name, int valid_entries,
                 int* out_insertion_index) {
  DCHECK(search_mode == ALL_ENTRIES || out_insertion_index == nullptr);
  int low = 0;
  int high = array->number_of_entries() - 1;
  uint32_t hash = name->hash_field();
  int limit = high;

  DCHECK(low <= high);

  while (low != high) {
    int mid = low + (high - low) / 2;
    Name mid_name = array->GetSortedKey(mid);
    uint32_t mid_hash = mid_name->hash_field();

    if (mid_hash >= hash) {
      high = mid;
    } else {
      low = mid + 1;
    }
  }

  for (; low <= limit; ++low) {
    int sort_index = array->GetSortedKeyIndex(low);
    Name entry = array->GetKey(sort_index);
    uint32_t current_hash = entry->hash_field();
    if (current_hash != hash) {
      if (search_mode == ALL_ENTRIES && out_insertion_index != nullptr) {
        *out_insertion_index = sort_index + (current_hash > hash ? 0 : 1);
      }
      return T::kNotFound;
    }
    if (entry == name) {
      if (search_mode == ALL_ENTRIES || sort_index < valid_entries) {
        return sort_index;
      }
      return T::kNotFound;
    }
  }

  if (search_mode == ALL_ENTRIES && out_insertion_index != nullptr) {
    *out_insertion_index = limit + 1;
  }
  return T::kNotFound;
}

// Perform a linear search in this fixed array. len is the number of entry
// indices that are valid.
template <SearchMode search_mode, typename T>
int LinearSearch(T* array, Name name, int valid_entries,
                 int* out_insertion_index) {
  if (search_mode == ALL_ENTRIES && out_insertion_index != nullptr) {
    uint32_t hash = name->hash_field();
    int len = array->number_of_entries();
    for (int number = 0; number < len; number++) {
      int sorted_index = array->GetSortedKeyIndex(number);
      Name entry = array->GetKey(sorted_index);
      uint32_t current_hash = entry->hash_field();
      if (current_hash > hash) {
        *out_insertion_index = sorted_index;
        return T::kNotFound;
      }
      if (entry == name) return sorted_index;
    }
    *out_insertion_index = len;
    return T::kNotFound;
  } else {
    DCHECK_LE(valid_entries, array->number_of_entries());
    DCHECK_NULL(out_insertion_index);  // Not supported here.
    for (int number = 0; number < valid_entries; number++) {
      if (array->GetKey(number) == name) return number;
    }
    return T::kNotFound;
  }
}

template <SearchMode search_mode, typename T>
int Search(T* array, Name name, int valid_entries, int* out_insertion_index) {
  SLOW_DCHECK(array->IsSortedNoDuplicates());

  if (valid_entries == 0) {
    if (search_mode == ALL_ENTRIES && out_insertion_index != nullptr) {
      *out_insertion_index = 0;
    }
    return T::kNotFound;
  }

  // Fast case: do linear search for small arrays.
  const int kMaxElementsForLinearSearch = 8;
  if (valid_entries <= kMaxElementsForLinearSearch) {
    return LinearSearch<search_mode>(array, name, valid_entries,
                                     out_insertion_index);
  }

  // Slow case: perform binary search.
  return BinarySearch<search_mode>(array, name, valid_entries,
                                   out_insertion_index);
}

int DescriptorArray::Search(Name name, int valid_descriptors) {
  DCHECK(name->IsUniqueName());
  return internal::Search<VALID_ENTRIES>(this, name, valid_descriptors,
                                         nullptr);
}

int DescriptorArray::Search(Name name, Map map) {
  DCHECK(name->IsUniqueName());
  int number_of_own_descriptors = map->NumberOfOwnDescriptors();
  if (number_of_own_descriptors == 0) return kNotFound;
  return Search(name, number_of_own_descriptors);
}

int DescriptorArray::SearchWithCache(Isolate* isolate, Name name, Map map) {
  DCHECK(name->IsUniqueName());
  int number_of_own_descriptors = map->NumberOfOwnDescriptors();
  if (number_of_own_descriptors == 0) return kNotFound;

  DescriptorLookupCache* cache = isolate->descriptor_lookup_cache();
  int number = cache->Lookup(map, name);

  if (number == DescriptorLookupCache::kAbsent) {
    number = Search(name, number_of_own_descriptors);
    cache->Update(map, name, number);
  }

  return number;
}

ObjectSlot DescriptorArray::GetFirstPointerSlot() {
  return ObjectSlot(
      HeapObject::RawField(this, DescriptorArray::kPointersStartOffset));
}

ObjectSlot DescriptorArray::GetDescriptorSlot(int descriptor) {
  // Allow descriptor == number_of_all_descriptors() for computing the slot
  // address that comes after the last descriptor (for iterating).
  DCHECK_LE(descriptor, number_of_all_descriptors());
  return HeapObject::RawField(this, OffsetOfDescriptorAt(descriptor));
}

ObjectSlot DescriptorArray::GetKeySlot(int descriptor) {
  DCHECK_LE(descriptor, number_of_all_descriptors());
  ObjectSlot slot = GetDescriptorSlot(descriptor) + kEntryKeyIndex;
  DCHECK((*slot)->IsObject());
  return slot;
}

Name DescriptorArray::GetKey(int descriptor_number) {
  DCHECK(descriptor_number < number_of_descriptors());
  return Name::cast(
      get(ToKeyIndex(descriptor_number))->GetHeapObjectAssumeStrong());
}

int DescriptorArray::GetSortedKeyIndex(int descriptor_number) {
  return GetDetails(descriptor_number).pointer();
}

Name DescriptorArray::GetSortedKey(int descriptor_number) {
  return GetKey(GetSortedKeyIndex(descriptor_number));
}

void DescriptorArray::SetSortedKey(int descriptor_index, int pointer) {
  PropertyDetails details = GetDetails(descriptor_index);
  set(ToDetailsIndex(descriptor_index),
      MaybeObject::FromObject(details.set_pointer(pointer).AsSmi()));
}

MaybeObjectSlot DescriptorArray::GetValueSlot(int descriptor) {
  DCHECK_LT(descriptor, number_of_descriptors());
  return MaybeObjectSlot(GetDescriptorSlot(descriptor) + kEntryValueIndex);
}

Object* DescriptorArray::GetStrongValue(int descriptor_number) {
  DCHECK(descriptor_number < number_of_descriptors());
  return get(ToValueIndex(descriptor_number))->cast<Object>();
}

void DescriptorArray::SetValue(int descriptor_index, Object* value) {
  set(ToValueIndex(descriptor_index), MaybeObject::FromObject(value));
}

MaybeObject DescriptorArray::GetValue(int descriptor_number) {
  DCHECK_LT(descriptor_number, number_of_descriptors());
  return get(ToValueIndex(descriptor_number));
}

PropertyDetails DescriptorArray::GetDetails(int descriptor_number) {
  DCHECK(descriptor_number < number_of_descriptors());
  MaybeObject details = get(ToDetailsIndex(descriptor_number));
  return PropertyDetails(details->ToSmi());
}

int DescriptorArray::GetFieldIndex(int descriptor_number) {
  DCHECK_EQ(GetDetails(descriptor_number).location(), kField);
  return GetDetails(descriptor_number).field_index();
}

FieldType DescriptorArray::GetFieldType(int descriptor_number) {
  DCHECK_EQ(GetDetails(descriptor_number).location(), kField);
  MaybeObject wrapped_type = GetValue(descriptor_number);
  return Map::UnwrapFieldType(wrapped_type);
}

void DescriptorArray::Set(int descriptor_number, Name key, MaybeObject value,
                          PropertyDetails details) {
  // Range check.
  DCHECK(descriptor_number < number_of_descriptors());
  set(ToKeyIndex(descriptor_number), MaybeObject::FromObject(key));
  set(ToValueIndex(descriptor_number), value);
  set(ToDetailsIndex(descriptor_number),
      MaybeObject::FromObject(details.AsSmi()));
}

void DescriptorArray::Set(int descriptor_number, Descriptor* desc) {
  Name key = *desc->GetKey();
  MaybeObject value = *desc->GetValue();
  Set(descriptor_number, key, value, desc->GetDetails());
}


void DescriptorArray::Append(Descriptor* desc) {
  DisallowHeapAllocation no_gc;
  int descriptor_number = number_of_descriptors();
  DCHECK_LE(descriptor_number + 1, number_of_all_descriptors());
  set_number_of_descriptors(descriptor_number + 1);
  Set(descriptor_number, desc);

  uint32_t hash = desc->GetKey()->Hash();

  int insertion;

  for (insertion = descriptor_number; insertion > 0; --insertion) {
    Name key = GetSortedKey(insertion - 1);
    if (key->Hash() <= hash) break;
    SetSortedKey(insertion, GetSortedKeyIndex(insertion - 1));
  }

  SetSortedKey(insertion, descriptor_number);
}


void DescriptorArray::SwapSortedKeys(int first, int second) {
  int first_key = GetSortedKeyIndex(first);
  SetSortedKey(first, GetSortedKeyIndex(second));
  SetSortedKey(second, first_key);
}

int DescriptorArray::length() const {
  return number_of_all_descriptors() * kEntrySize;
}

MaybeObject DescriptorArray::get(int index) const {
  DCHECK(index >= 0 && index < this->length());
  return RELAXED_READ_WEAK_FIELD(this, offset(index));
}

void DescriptorArray::set(int index, MaybeObject value) {
  DCHECK(index >= 0 && index < this->length());
  RELAXED_WRITE_WEAK_FIELD(this, offset(index), value);
  WEAK_WRITE_BARRIER(this, offset(index), value);
}

bool StringSetShape::IsMatch(String key, Object* value) {
  DCHECK(value->IsString());
  return key->Equals(String::cast(value));
}

uint32_t StringSetShape::Hash(Isolate* isolate, String key) {
  return key->Hash();
}

uint32_t StringSetShape::HashForObject(Isolate* isolate, Object* object) {
  return String::cast(object)->Hash();
}

StringTableKey::StringTableKey(uint32_t hash_field)
    : HashTableKey(hash_field >> Name::kHashShift), hash_field_(hash_field) {}

void StringTableKey::set_hash_field(uint32_t hash_field) {
  hash_field_ = hash_field;
  set_hash(hash_field >> Name::kHashShift);
}

Handle<Object> StringTableShape::AsHandle(Isolate* isolate,
                                          StringTableKey* key) {
  return key->AsHandle(isolate);
}

uint32_t StringTableShape::HashForObject(Isolate* isolate, Object* object) {
  return String::cast(object)->Hash();
}

RootIndex StringTableShape::GetMapRootIndex() {
  return RootIndex::kStringTableMap;
}

bool NumberDictionary::requires_slow_elements() {
  Object* max_index_object = get(kMaxNumberKeyIndex);
  if (!max_index_object->IsSmi()) return false;
  return 0 != (Smi::ToInt(max_index_object) & kRequiresSlowElementsMask);
}

uint32_t NumberDictionary::max_number_key() {
  DCHECK(!requires_slow_elements());
  Object* max_index_object = get(kMaxNumberKeyIndex);
  if (!max_index_object->IsSmi()) return 0;
  uint32_t value = static_cast<uint32_t>(Smi::ToInt(max_index_object));
  return value >> kRequiresSlowElementsTagSize;
}

void NumberDictionary::set_requires_slow_elements() {
  set(kMaxNumberKeyIndex, Smi::FromInt(kRequiresSlowElementsMask));
}

DEFINE_DEOPT_ELEMENT_ACCESSORS2(TranslationByteArray, ByteArray)
DEFINE_DEOPT_ELEMENT_ACCESSORS2(InlinedFunctionCount, Smi)
DEFINE_DEOPT_ELEMENT_ACCESSORS2(LiteralArray, FixedArray)
DEFINE_DEOPT_ELEMENT_ACCESSORS2(OsrBytecodeOffset, Smi)
DEFINE_DEOPT_ELEMENT_ACCESSORS2(OsrPcOffset, Smi)
DEFINE_DEOPT_ELEMENT_ACCESSORS2(OptimizationId, Smi)
DEFINE_DEOPT_ELEMENT_ACCESSORS2(InliningPositions, PodArray<InliningPosition>)

DEFINE_DEOPT_ENTRY_ACCESSORS(BytecodeOffsetRaw, Smi)
DEFINE_DEOPT_ENTRY_ACCESSORS(TranslationIndex, Smi)
DEFINE_DEOPT_ENTRY_ACCESSORS(Pc, Smi)

SMI_ACCESSORS(FreeSpace, size, kSizeOffset)
RELAXED_SMI_ACCESSORS(FreeSpace, size, kSizeOffset)


int FreeSpace::Size() { return size(); }


FreeSpace* FreeSpace::next() {
#ifdef DEBUG
  Heap* heap = Heap::FromWritableHeapObject(this);
  DCHECK_IMPLIES(map() != heap->isolate()->root(RootIndex::kFreeSpaceMap),
                 !heap->deserialization_complete() && map().is_null());
#endif
  DCHECK_LE(kNextOffset + kPointerSize, relaxed_read_size());
  return reinterpret_cast<FreeSpace*>(Memory<Address>(address() + kNextOffset));
}


void FreeSpace::set_next(FreeSpace* next) {
#ifdef DEBUG
  Heap* heap = Heap::FromWritableHeapObject(this);
  DCHECK_IMPLIES(map() != heap->isolate()->root(RootIndex::kFreeSpaceMap),
                 !heap->deserialization_complete() && map().is_null());
#endif
  DCHECK_LE(kNextOffset + kPointerSize, relaxed_read_size());
  base::Relaxed_Store(
      reinterpret_cast<base::AtomicWord*>(address() + kNextOffset),
      reinterpret_cast<base::AtomicWord>(next));
}


FreeSpace* FreeSpace::cast(HeapObject* o) {
  SLOW_DCHECK(!Heap::FromWritableHeapObject(o)->deserialization_complete() ||
              o->IsFreeSpace());
  return reinterpret_cast<FreeSpace*>(o);
}

int HeapObject::SizeFromMap(Map map) const {
  int instance_size = map->instance_size();
  if (instance_size != kVariableSizeSentinel) return instance_size;
  // Only inline the most frequent cases.
  InstanceType instance_type = map->instance_type();
  if (IsInRange(instance_type, FIRST_FIXED_ARRAY_TYPE, LAST_FIXED_ARRAY_TYPE)) {
    return FixedArray::SizeFor(
        FixedArray::unchecked_cast(this)->synchronized_length());
  }
  if (IsInRange(instance_type, FIRST_CONTEXT_TYPE, LAST_CONTEXT_TYPE)) {
    // Native context has fixed size.
    DCHECK_NE(instance_type, NATIVE_CONTEXT_TYPE);
    return Context::SizeFor(Context::unchecked_cast(this)->length());
  }
  if (instance_type == ONE_BYTE_STRING_TYPE ||
      instance_type == ONE_BYTE_INTERNALIZED_STRING_TYPE) {
    // Strings may get concurrently truncated, hence we have to access its
    // length synchronized.
    return SeqOneByteString::SizeFor(
        SeqOneByteString::unchecked_cast(this)->synchronized_length());
  }
  if (instance_type == BYTE_ARRAY_TYPE) {
    return ByteArray::SizeFor(
        ByteArray::unchecked_cast(this)->synchronized_length());
  }
  if (instance_type == BYTECODE_ARRAY_TYPE) {
    return BytecodeArray::SizeFor(
        BytecodeArray::unchecked_cast(this)->synchronized_length());
  }
  if (instance_type == FREE_SPACE_TYPE) {
    return reinterpret_cast<const FreeSpace*>(this)->relaxed_read_size();
  }
  if (instance_type == STRING_TYPE ||
      instance_type == INTERNALIZED_STRING_TYPE) {
    // Strings may get concurrently truncated, hence we have to access its
    // length synchronized.
    return SeqTwoByteString::SizeFor(
        SeqTwoByteString::unchecked_cast(this)->synchronized_length());
  }
  if (instance_type == FIXED_DOUBLE_ARRAY_TYPE) {
    return FixedDoubleArray::SizeFor(
        FixedDoubleArray::unchecked_cast(this)->synchronized_length());
  }
  if (instance_type == FEEDBACK_METADATA_TYPE) {
    return FeedbackMetadata::SizeFor(
        reinterpret_cast<const FeedbackMetadata*>(this)
            ->synchronized_slot_count());
  }
  if (instance_type == DESCRIPTOR_ARRAY_TYPE) {
    return DescriptorArray::SizeFor(
        reinterpret_cast<const DescriptorArray*>(this)
            ->number_of_all_descriptors());
  }
  if (IsInRange(instance_type, FIRST_WEAK_FIXED_ARRAY_TYPE,
                LAST_WEAK_FIXED_ARRAY_TYPE)) {
    return WeakFixedArray::SizeFor(
        reinterpret_cast<const WeakFixedArray*>(this)->synchronized_length());
  }
  if (instance_type == WEAK_ARRAY_LIST_TYPE) {
    return WeakArrayList::SizeForCapacity(
        reinterpret_cast<const WeakArrayList*>(this)->synchronized_capacity());
  }
  if (IsInRange(instance_type, FIRST_FIXED_TYPED_ARRAY_TYPE,
                LAST_FIXED_TYPED_ARRAY_TYPE)) {
    return FixedTypedArrayBase::unchecked_cast(this)->TypedArraySize(
        instance_type);
  }
  if (instance_type == SMALL_ORDERED_HASH_SET_TYPE) {
    return SmallOrderedHashSet::SizeFor(
        SmallOrderedHashSet::unchecked_cast(this)->Capacity());
  }
  if (instance_type == SMALL_ORDERED_HASH_MAP_TYPE) {
    return SmallOrderedHashMap::SizeFor(
        SmallOrderedHashMap::unchecked_cast(this)->Capacity());
  }
  if (instance_type == SMALL_ORDERED_NAME_DICTIONARY_TYPE) {
    return SmallOrderedNameDictionary::SizeFor(
        SmallOrderedNameDictionary::unchecked_cast(this)->Capacity());
  }
  if (instance_type == PROPERTY_ARRAY_TYPE) {
    return PropertyArray::SizeFor(
        PropertyArray::cast(this)->synchronized_length());
  }
  if (instance_type == FEEDBACK_VECTOR_TYPE) {
    return FeedbackVector::SizeFor(
        reinterpret_cast<const FeedbackVector*>(this)->length());
  }
  if (instance_type == BIGINT_TYPE) {
    return BigInt::SizeFor(reinterpret_cast<const BigInt*>(this)->length());
  }
  if (instance_type == PRE_PARSED_SCOPE_DATA_TYPE) {
    return PreParsedScopeData::SizeFor(
        reinterpret_cast<const PreParsedScopeData*>(this)->length());
  }
  if (instance_type == CODE_TYPE) {
    return Code::unchecked_cast(this)->CodeSize();
  }
  DCHECK_EQ(instance_type, EMBEDDER_DATA_ARRAY_TYPE);
  return EmbedderDataArray::SizeFor(
      EmbedderDataArray::unchecked_cast(this)->length());
}

ACCESSORS(Tuple2, value1, Object, kValue1Offset)
ACCESSORS(Tuple2, value2, Object, kValue2Offset)
ACCESSORS(Tuple3, value3, Object, kValue3Offset)

ACCESSORS2(TemplateObjectDescription, raw_strings, FixedArray,
           kRawStringsOffset)
ACCESSORS2(TemplateObjectDescription, cooked_strings, FixedArray,
           kCookedStringsOffset)

ACCESSORS(AccessorPair, getter, Object, kGetterOffset)
ACCESSORS(AccessorPair, setter, Object, kSetterOffset)

// static
bool Foreign::IsNormalized(Object* value) {
  if (value == Smi::kZero) return true;
  return Foreign::cast(value)->foreign_address() != kNullAddress;
}

Address Foreign::foreign_address() {
  return READ_UINTPTR_FIELD(this, kForeignAddressOffset);
}

void Foreign::set_foreign_address(Address value) {
  WRITE_UINTPTR_FIELD(this, kForeignAddressOffset, value);
}

template <class Derived>
void SmallOrderedHashTable<Derived>::SetDataEntry(int entry, int relative_index,
                                                  Object* value) {
  DCHECK_NE(kNotFound, entry);
  Address entry_offset = GetDataEntryOffset(entry, relative_index);
  RELAXED_WRITE_FIELD(this, entry_offset, value);
  WRITE_BARRIER(this, static_cast<int>(entry_offset), value);
}

// static
Maybe<bool> Object::GreaterThan(Isolate* isolate, Handle<Object> x,
                                Handle<Object> y) {
  Maybe<ComparisonResult> result = Compare(isolate, x, y);
  if (result.IsJust()) {
    switch (result.FromJust()) {
      case ComparisonResult::kGreaterThan:
        return Just(true);
      case ComparisonResult::kLessThan:
      case ComparisonResult::kEqual:
      case ComparisonResult::kUndefined:
        return Just(false);
    }
  }
  return Nothing<bool>();
}


// static
Maybe<bool> Object::GreaterThanOrEqual(Isolate* isolate, Handle<Object> x,
                                       Handle<Object> y) {
  Maybe<ComparisonResult> result = Compare(isolate, x, y);
  if (result.IsJust()) {
    switch (result.FromJust()) {
      case ComparisonResult::kEqual:
      case ComparisonResult::kGreaterThan:
        return Just(true);
      case ComparisonResult::kLessThan:
      case ComparisonResult::kUndefined:
        return Just(false);
    }
  }
  return Nothing<bool>();
}


// static
Maybe<bool> Object::LessThan(Isolate* isolate, Handle<Object> x,
                             Handle<Object> y) {
  Maybe<ComparisonResult> result = Compare(isolate, x, y);
  if (result.IsJust()) {
    switch (result.FromJust()) {
      case ComparisonResult::kLessThan:
        return Just(true);
      case ComparisonResult::kEqual:
      case ComparisonResult::kGreaterThan:
      case ComparisonResult::kUndefined:
        return Just(false);
    }
  }
  return Nothing<bool>();
}


// static
Maybe<bool> Object::LessThanOrEqual(Isolate* isolate, Handle<Object> x,
                                    Handle<Object> y) {
  Maybe<ComparisonResult> result = Compare(isolate, x, y);
  if (result.IsJust()) {
    switch (result.FromJust()) {
      case ComparisonResult::kEqual:
      case ComparisonResult::kLessThan:
        return Just(true);
      case ComparisonResult::kGreaterThan:
      case ComparisonResult::kUndefined:
        return Just(false);
    }
  }
  return Nothing<bool>();
}

MaybeHandle<Object> Object::GetPropertyOrElement(Isolate* isolate,
                                                 Handle<Object> object,
                                                 Handle<Name> name) {
  LookupIterator it = LookupIterator::PropertyOrElement(isolate, object, name);
  return GetProperty(&it);
}

MaybeHandle<Object> Object::SetPropertyOrElement(Isolate* isolate,
                                                 Handle<Object> object,
                                                 Handle<Name> name,
                                                 Handle<Object> value,
                                                 LanguageMode language_mode,
                                                 StoreOrigin store_origin) {
  LookupIterator it = LookupIterator::PropertyOrElement(isolate, object, name);
  MAYBE_RETURN_NULL(SetProperty(&it, value, language_mode, store_origin));
  return value;
}

MaybeHandle<Object> Object::GetPropertyOrElement(Handle<Object> receiver,
                                                 Handle<Name> name,
                                                 Handle<JSReceiver> holder) {
  LookupIterator it = LookupIterator::PropertyOrElement(holder->GetIsolate(),
                                                        receiver, name, holder);
  return GetProperty(&it);
}



Object* AccessorPair::get(AccessorComponent component) {
  return component == ACCESSOR_GETTER ? getter() : setter();
}


void AccessorPair::set(AccessorComponent component, Object* value) {
  if (component == ACCESSOR_GETTER) {
    set_getter(value);
  } else {
    set_setter(value);
  }
}


void AccessorPair::SetComponents(Object* getter, Object* setter) {
  if (!getter->IsNull()) set_getter(getter);
  if (!setter->IsNull()) set_setter(setter);
}

bool AccessorPair::Equals(AccessorPair* pair) {
  return (this == pair) || pair->Equals(getter(), setter());
}


bool AccessorPair::Equals(Object* getter_value, Object* setter_value) {
  return (getter() == getter_value) && (setter() == setter_value);
}


bool AccessorPair::ContainsAccessor() {
  return IsJSAccessor(getter()) || IsJSAccessor(setter());
}


bool AccessorPair::IsJSAccessor(Object* obj) {
  return obj->IsCallable() || obj->IsUndefined();
}

template <typename Derived, typename Shape>
void Dictionary<Derived, Shape>::ClearEntry(Isolate* isolate, int entry) {
  Object* the_hole = this->GetReadOnlyRoots().the_hole_value();
  PropertyDetails details = PropertyDetails::Empty();
  Derived::cast(*this)->SetEntry(isolate, entry, the_hole, the_hole, details);
}

template <typename Derived, typename Shape>
void Dictionary<Derived, Shape>::SetEntry(Isolate* isolate, int entry,
                                          Object* key, Object* value,
                                          PropertyDetails details) {
  DCHECK(Dictionary::kEntrySize == 2 || Dictionary::kEntrySize == 3);
  DCHECK(!key->IsName() || details.dictionary_index() > 0);
  int index = DerivedHashTable::EntryToIndex(entry);
  DisallowHeapAllocation no_gc;
  WriteBarrierMode mode = this->GetWriteBarrierMode(no_gc);
  this->set(index + Derived::kEntryKeyIndex, key, mode);
  this->set(index + Derived::kEntryValueIndex, value, mode);
  if (Shape::kHasDetails) DetailsAtPut(isolate, entry, details);
}

Object* GlobalDictionaryShape::Unwrap(Object* object) {
  return PropertyCell::cast(object)->name();
}

RootIndex GlobalDictionaryShape::GetMapRootIndex() {
  return RootIndex::kGlobalDictionaryMap;
}

Name NameDictionary::NameAt(int entry) { return Name::cast(KeyAt(entry)); }

RootIndex NameDictionaryShape::GetMapRootIndex() {
  return RootIndex::kNameDictionaryMap;
}

PropertyCell* GlobalDictionary::CellAt(int entry) {
  DCHECK(KeyAt(entry)->IsPropertyCell());
  return PropertyCell::cast(KeyAt(entry));
}

bool GlobalDictionaryShape::IsLive(ReadOnlyRoots roots, Object* k) {
  DCHECK_NE(roots.the_hole_value(), k);
  return k != roots.undefined_value();
}

bool GlobalDictionaryShape::IsKey(ReadOnlyRoots roots, Object* k) {
  return IsLive(roots, k) && !PropertyCell::cast(k)->value()->IsTheHole(roots);
}

Name GlobalDictionary::NameAt(int entry) { return CellAt(entry)->name(); }
Object* GlobalDictionary::ValueAt(int entry) { return CellAt(entry)->value(); }

void GlobalDictionary::SetEntry(Isolate* isolate, int entry, Object* key,
                                Object* value, PropertyDetails details) {
  DCHECK_EQ(key, PropertyCell::cast(value)->name());
  set(EntryToIndex(entry) + kEntryKeyIndex, value);
  DetailsAtPut(isolate, entry, details);
}

void GlobalDictionary::ValueAtPut(int entry, Object* value) {
  set(EntryToIndex(entry), value);
}

bool NumberDictionaryBaseShape::IsMatch(uint32_t key, Object* other) {
  DCHECK(other->IsNumber());
  return key == static_cast<uint32_t>(other->Number());
}

uint32_t NumberDictionaryBaseShape::Hash(Isolate* isolate, uint32_t key) {
  return ComputeSeededHash(key, isolate->heap()->HashSeed());
}

uint32_t NumberDictionaryBaseShape::HashForObject(Isolate* isolate,
                                                  Object* other) {
  DCHECK(other->IsNumber());
  return ComputeSeededHash(static_cast<uint32_t>(other->Number()),
                           isolate->heap()->HashSeed());
}

Handle<Object> NumberDictionaryBaseShape::AsHandle(Isolate* isolate,
                                                   uint32_t key) {
  return isolate->factory()->NewNumberFromUint(key);
}

RootIndex NumberDictionaryShape::GetMapRootIndex() {
  return RootIndex::kNumberDictionaryMap;
}

RootIndex SimpleNumberDictionaryShape::GetMapRootIndex() {
  return RootIndex::kSimpleNumberDictionaryMap;
}

bool NameDictionaryShape::IsMatch(Handle<Name> key, Object* other) {
  DCHECK(other->IsTheHole() || Name::cast(other)->IsUniqueName());
  DCHECK(key->IsUniqueName());
  return *key == other;
}

uint32_t NameDictionaryShape::Hash(Isolate* isolate, Handle<Name> key) {
  return key->Hash();
}

uint32_t NameDictionaryShape::HashForObject(Isolate* isolate, Object* other) {
  return Name::cast(other)->Hash();
}

bool GlobalDictionaryShape::IsMatch(Handle<Name> key, Object* other) {
  DCHECK(PropertyCell::cast(other)->name()->IsUniqueName());
  return *key == PropertyCell::cast(other)->name();
}

uint32_t GlobalDictionaryShape::HashForObject(Isolate* isolate, Object* other) {
  return PropertyCell::cast(other)->name()->Hash();
}

Handle<Object> NameDictionaryShape::AsHandle(Isolate* isolate,
                                             Handle<Name> key) {
  DCHECK(key->IsUniqueName());
  return key;
}

template <typename Dictionary>
PropertyDetails GlobalDictionaryShape::DetailsAt(Dictionary dict, int entry) {
  DCHECK_LE(0, entry);  // Not found is -1, which is not caught by get().
  return dict->CellAt(entry)->property_details();
}

template <typename Dictionary>
void GlobalDictionaryShape::DetailsAtPut(Isolate* isolate, Dictionary dict,
                                         int entry, PropertyDetails value) {
  DCHECK_LE(0, entry);  // Not found is -1, which is not caught by get().
  PropertyCell* cell = dict->CellAt(entry);
  if (cell->property_details().IsReadOnly() != value.IsReadOnly()) {
    cell->dependent_code()->DeoptimizeDependentCodeGroup(
        isolate, DependentCode::kPropertyCellChangedGroup);
  }
  cell->set_property_details(value);
}

bool ObjectHashTableShape::IsMatch(Handle<Object> key, Object* other) {
  return key->SameValue(other);
}

uint32_t ObjectHashTableShape::Hash(Isolate* isolate, Handle<Object> key) {
  return Smi::ToInt(key->GetHash());
}

uint32_t ObjectHashTableShape::HashForObject(Isolate* isolate, Object* other) {
  return Smi::ToInt(other->GetHash());
}

// static
Object* Object::GetSimpleHash(Object* object) {
  DisallowHeapAllocation no_gc;
  if (object->IsSmi()) {
    uint32_t hash = ComputeUnseededHash(Smi::ToInt(object));
    return Smi::FromInt(hash & Smi::kMaxValue);
  }
  if (object->IsHeapNumber()) {
    double num = HeapNumber::cast(object)->value();
    if (std::isnan(num)) return Smi::FromInt(Smi::kMaxValue);
    // Use ComputeUnseededHash for all values in Signed32 range, including -0,
    // which is considered equal to 0 because collections use SameValueZero.
    uint32_t hash;
    // Check range before conversion to avoid undefined behavior.
    if (num >= kMinInt && num <= kMaxInt && FastI2D(FastD2I(num)) == num) {
      hash = ComputeUnseededHash(FastD2I(num));
    } else {
      hash = ComputeLongHash(double_to_uint64(num));
    }
    return Smi::FromInt(hash & Smi::kMaxValue);
  }
  if (object->IsName()) {
    uint32_t hash = Name::cast(object)->Hash();
    return Smi::FromInt(hash);
  }
  if (object->IsOddball()) {
    uint32_t hash = Oddball::cast(object)->to_string()->Hash();
    return Smi::FromInt(hash);
  }
  if (object->IsBigInt()) {
    uint32_t hash = BigInt::cast(object)->Hash();
    return Smi::FromInt(hash & Smi::kMaxValue);
  }
  DCHECK(object->IsJSReceiver());
  return object;
}

Object* Object::GetHash() {
  DisallowHeapAllocation no_gc;
  Object* hash = GetSimpleHash(this);
  if (hash->IsSmi()) return hash;

  DCHECK(IsJSReceiver());
  JSReceiver* receiver = JSReceiver::cast(this);
  return receiver->GetIdentityHash();
}

Handle<Object> ObjectHashTableShape::AsHandle(Handle<Object> key) {
  return key;
}

Relocatable::Relocatable(Isolate* isolate) {
  isolate_ = isolate;
  prev_ = isolate->relocatable_top();
  isolate->set_relocatable_top(this);
}


Relocatable::~Relocatable() {
  DCHECK_EQ(isolate_->relocatable_top(), this);
  isolate_->set_relocatable_top(prev_);
}


template<class Derived, class TableType>
Object* OrderedHashTableIterator<Derived, TableType>::CurrentKey() {
  TableType table = TableType::cast(this->table());
  int index = Smi::ToInt(this->index());
  Object* key = table->KeyAt(index);
  DCHECK(!key->IsTheHole());
  return key;
}

// Predictably converts HeapObject* or Address to uint32 by calculating
// offset of the address in respective MemoryChunk.
static inline uint32_t ObjectAddressForHashing(void* object) {
  uint32_t value = static_cast<uint32_t>(reinterpret_cast<uintptr_t>(object));
  return value & MemoryChunk::kAlignmentMask;
}

static inline Handle<Object> MakeEntryPair(Isolate* isolate, uint32_t index,
                                           Handle<Object> value) {
  Handle<Object> key = isolate->factory()->Uint32ToString(index);
  Handle<FixedArray> entry_storage =
      isolate->factory()->NewUninitializedFixedArray(2);
  {
    entry_storage->set(0, *key, SKIP_WRITE_BARRIER);
    entry_storage->set(1, *value, SKIP_WRITE_BARRIER);
  }
  return isolate->factory()->NewJSArrayWithElements(entry_storage,
                                                    PACKED_ELEMENTS, 2);
}

static inline Handle<Object> MakeEntryPair(Isolate* isolate, Handle<Object> key,
                                           Handle<Object> value) {
  Handle<FixedArray> entry_storage =
      isolate->factory()->NewUninitializedFixedArray(2);
  {
    entry_storage->set(0, *key, SKIP_WRITE_BARRIER);
    entry_storage->set(1, *value, SKIP_WRITE_BARRIER);
  }
  return isolate->factory()->NewJSArrayWithElements(entry_storage,
                                                    PACKED_ELEMENTS, 2);
}


bool ScopeInfo::IsAsmModule() const { return AsmModuleField::decode(Flags()); }

bool ScopeInfo::HasSimpleParameters() const {
  return HasSimpleParametersField::decode(Flags());
}

#define FIELD_ACCESSORS(name)                                                 \
  void ScopeInfo::Set##name(int value) { set(k##name, Smi::FromInt(value)); } \
  int ScopeInfo::name() const {                                               \
    if (length() > 0) {                                                       \
      return Smi::ToInt(get(k##name));                                        \
    } else {                                                                  \
      return 0;                                                               \
    }                                                                         \
  }
FOR_EACH_SCOPE_INFO_NUMERIC_FIELD(FIELD_ACCESSORS)
#undef FIELD_ACCESSORS

FreshlyAllocatedBigInt* FreshlyAllocatedBigInt::cast(Object* object) {
  SLOW_DCHECK(object->IsBigInt());
  return reinterpret_cast<FreshlyAllocatedBigInt*>(object);
}

}  // namespace internal
}  // namespace v8

#include "src/objects/object-macros-undef.h"

#endif  // V8_OBJECTS_INL_H_