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// Copyright 2018 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.
#ifndef V8_OBJECTS_DESCRIPTOR_ARRAY_INL_H_
#define V8_OBJECTS_DESCRIPTOR_ARRAY_INL_H_
#include "src/objects/descriptor-array.h"
#include "src/field-type.h"
#include "src/heap/heap-write-barrier.h"
#include "src/heap/heap.h"
#include "src/isolate.h"
#include "src/lookup-cache.h"
#include "src/objects/heap-object-inl.h"
#include "src/objects/maybe-object.h"
#include "src/objects/struct-inl.h"
#include "src/property.h"
// Has to be the last include (doesn't have include guards):
#include "src/objects/object-macros.h"
namespace v8 {
namespace internal {
OBJECT_CONSTRUCTORS_IMPL(DescriptorArray, HeapObject)
OBJECT_CONSTRUCTORS_IMPL(EnumCache, Tuple2)
CAST_ACCESSOR(DescriptorArray)
CAST_ACCESSOR(EnumCache)
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, raw_number_of_marked_descriptors,
kRawNumberOfMarkedDescriptorsOffset)
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();
}
inline int16_t DescriptorArray::CompareAndSwapRawNumberOfMarkedDescriptors(
int16_t expected, int16_t value) {
return base::Relaxed_CompareAndSwap(
reinterpret_cast<base::Atomic16*>(
FIELD_ADDR(this, kRawNumberOfMarkedDescriptorsOffset)),
expected, value);
}
void DescriptorArray::CopyEnumCacheFrom(DescriptorArray array) {
set_enum_cache(array->enum_cache());
}
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 RawField(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 RawField(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) const {
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);
}
} // namespace internal
} // namespace v8
#include "src/objects/object-macros-undef.h"
#endif // V8_OBJECTS_DESCRIPTOR_ARRAY_INL_H_
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