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// 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.
#ifndef V8_TRANSITIONS_INL_H_
#define V8_TRANSITIONS_INL_H_
#include "src/transitions.h"
#include "src/ic/handler-configuration-inl.h"
#include "src/objects/fixed-array-inl.h"
#include "src/objects/maybe-object-inl.h"
// Has to be the last include (doesn't have include guards):
#include "src/objects/object-macros.h"
namespace v8 {
namespace internal {
TransitionArray* TransitionsAccessor::transitions() {
DCHECK_EQ(kFullTransitionArray, encoding());
return TransitionArray::cast(raw_transitions_->ToStrongHeapObject());
}
CAST_ACCESSOR(TransitionArray)
bool TransitionArray::HasPrototypeTransitions() {
return Get(kPrototypeTransitionsIndex) != MaybeObject::FromSmi(Smi::kZero);
}
WeakFixedArray* TransitionArray::GetPrototypeTransitions() {
DCHECK(HasPrototypeTransitions()); // Callers must check first.
Object* prototype_transitions =
Get(kPrototypeTransitionsIndex)->ToStrongHeapObject();
return WeakFixedArray::cast(prototype_transitions);
}
HeapObjectReference** TransitionArray::GetKeySlot(int transition_number) {
DCHECK(transition_number < number_of_transitions());
return reinterpret_cast<HeapObjectReference**>(
RawFieldOfElementAt(ToKeyIndex(transition_number)));
}
void TransitionArray::SetPrototypeTransitions(WeakFixedArray* transitions) {
DCHECK(transitions->IsWeakFixedArray());
WeakFixedArray::Set(kPrototypeTransitionsIndex,
HeapObjectReference::Strong(transitions));
}
int TransitionArray::NumberOfPrototypeTransitions(
WeakFixedArray* proto_transitions) {
if (proto_transitions->length() == 0) return 0;
MaybeObject* raw =
proto_transitions->Get(kProtoTransitionNumberOfEntriesOffset);
return Smi::ToInt(raw->ToSmi());
}
Name* TransitionArray::GetKey(int transition_number) {
DCHECK(transition_number < number_of_transitions());
return Name::cast(Get(ToKeyIndex(transition_number))->ToStrongHeapObject());
}
Name* TransitionsAccessor::GetKey(int transition_number) {
switch (encoding()) {
case kPrototypeInfo:
case kUninitialized:
UNREACHABLE();
return nullptr;
case kWeakRef: {
Map* map = Map::cast(raw_transitions_->ToWeakHeapObject());
return GetSimpleTransitionKey(map);
}
case kFullTransitionArray:
return transitions()->GetKey(transition_number);
}
UNREACHABLE();
}
void TransitionArray::SetKey(int transition_number, Name* key) {
DCHECK(transition_number < number_of_transitions());
WeakFixedArray::Set(ToKeyIndex(transition_number),
HeapObjectReference::Strong(key));
}
HeapObjectReference** TransitionArray::GetTargetSlot(int transition_number) {
DCHECK(transition_number < number_of_transitions());
return reinterpret_cast<HeapObjectReference**>(
RawFieldOfElementAt(ToTargetIndex(transition_number)));
}
// static
PropertyDetails TransitionsAccessor::GetTargetDetails(Name* name, Map* target) {
DCHECK(!IsSpecialTransition(name->GetReadOnlyRoots(), name));
int descriptor = target->LastAdded();
DescriptorArray* descriptors = target->instance_descriptors();
// Transitions are allowed only for the last added property.
DCHECK(descriptors->GetKey(descriptor)->Equals(name));
return descriptors->GetDetails(descriptor);
}
// static
Map* TransitionsAccessor::GetTargetFromRaw(MaybeObject* raw) {
return Map::cast(raw->ToWeakHeapObject());
}
MaybeObject* TransitionArray::GetRawTarget(int transition_number) {
DCHECK(transition_number < number_of_transitions());
return Get(ToTargetIndex(transition_number));
}
Map* TransitionArray::GetTarget(int transition_number) {
MaybeObject* raw = GetRawTarget(transition_number);
return TransitionsAccessor::GetTargetFromRaw(raw);
}
Map* TransitionsAccessor::GetTarget(int transition_number) {
switch (encoding()) {
case kPrototypeInfo:
case kUninitialized:
UNREACHABLE();
return nullptr;
case kWeakRef:
return Map::cast(raw_transitions_->ToWeakHeapObject());
case kFullTransitionArray:
return transitions()->GetTarget(transition_number);
}
UNREACHABLE();
}
void TransitionArray::SetRawTarget(int transition_number, MaybeObject* value) {
DCHECK(transition_number < number_of_transitions());
DCHECK(value->IsWeakHeapObject() && value->ToWeakHeapObject()->IsMap());
WeakFixedArray::Set(ToTargetIndex(transition_number), value);
}
bool TransitionArray::GetTargetIfExists(int transition_number, Isolate* isolate,
Map** target) {
MaybeObject* raw = GetRawTarget(transition_number);
HeapObject* heap_object;
if (raw->ToStrongHeapObject(&heap_object) &&
heap_object->IsUndefined(isolate)) {
return false;
}
*target = TransitionsAccessor::GetTargetFromRaw(raw);
return true;
}
int TransitionArray::SearchName(Name* name, int* out_insertion_index) {
DCHECK(name->IsUniqueName());
return internal::Search<ALL_ENTRIES>(this, name, number_of_entries(),
out_insertion_index);
}
int TransitionArray::number_of_transitions() const {
if (length() < kFirstIndex) return 0;
return Smi::ToInt(Get(kTransitionLengthIndex)->ToSmi());
}
int TransitionArray::CompareKeys(Name* key1, uint32_t hash1, PropertyKind kind1,
PropertyAttributes attributes1, Name* key2,
uint32_t hash2, PropertyKind kind2,
PropertyAttributes attributes2) {
int cmp = CompareNames(key1, hash1, key2, hash2);
if (cmp != 0) return cmp;
return CompareDetails(kind1, attributes1, kind2, attributes2);
}
int TransitionArray::CompareNames(Name* key1, uint32_t hash1, Name* key2,
uint32_t hash2) {
if (key1 != key2) {
// In case of hash collisions key1 is always "less" than key2.
return hash1 <= hash2 ? -1 : 1;
}
return 0;
}
int TransitionArray::CompareDetails(PropertyKind kind1,
PropertyAttributes attributes1,
PropertyKind kind2,
PropertyAttributes attributes2) {
if (kind1 != kind2) {
return static_cast<int>(kind1) < static_cast<int>(kind2) ? -1 : 1;
}
if (attributes1 != attributes2) {
return static_cast<int>(attributes1) < static_cast<int>(attributes2) ? -1
: 1;
}
return 0;
}
void TransitionArray::Set(int transition_number, Name* key,
MaybeObject* target) {
WeakFixedArray::Set(ToKeyIndex(transition_number),
MaybeObject::FromObject(key));
WeakFixedArray::Set(ToTargetIndex(transition_number), target);
}
int TransitionArray::Capacity() {
if (length() <= kFirstIndex) return 0;
return (length() - kFirstIndex) / kEntrySize;
}
void TransitionArray::SetNumberOfTransitions(int number_of_transitions) {
DCHECK(number_of_transitions <= Capacity());
WeakFixedArray::Set(
kTransitionLengthIndex,
MaybeObject::FromSmi(Smi::FromInt(number_of_transitions)));
}
} // namespace internal
} // namespace v8
#include "src/objects/object-macros-undef.h"
#endif // V8_TRANSITIONS_INL_H_
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