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chromium / v8 / v8 / d3d57ebaf6cd7084892aae37c3e54293c07b65b8 / . / src / elements.cc
blob: c0a9540274407e0608197ccd37ebaa980b76b0f2 [file] [log] [blame]
// 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.
#include "src/elements.h"
#include "src/arguments.h"
#include "src/conversions.h"
#include "src/factory.h"
#include "src/isolate-inl.h"
#include "src/messages.h"
#include "src/objects-inl.h"
#include "src/utils.h"
// Each concrete ElementsAccessor can handle exactly one ElementsKind,
// several abstract ElementsAccessor classes are used to allow sharing
// common code.
//
// Inheritance hierarchy:
// - ElementsAccessorBase (abstract)
// - FastElementsAccessor (abstract)
// - FastSmiOrObjectElementsAccessor
// - FastPackedSmiElementsAccessor
// - FastHoleySmiElementsAccessor
// - FastPackedObjectElementsAccessor
// - FastHoleyObjectElementsAccessor
// - FastDoubleElementsAccessor
// - FastPackedDoubleElementsAccessor
// - FastHoleyDoubleElementsAccessor
// - TypedElementsAccessor: template, with instantiations:
// - FixedUint8ElementsAccessor
// - FixedInt8ElementsAccessor
// - FixedUint16ElementsAccessor
// - FixedInt16ElementsAccessor
// - FixedUint32ElementsAccessor
// - FixedInt32ElementsAccessor
// - FixedFloat32ElementsAccessor
// - FixedFloat64ElementsAccessor
// - FixedUint8ClampedElementsAccessor
// - DictionaryElementsAccessor
// - SloppyArgumentsElementsAccessor
// - FastSloppyArgumentsElementsAccessor
// - SlowSloppyArgumentsElementsAccessor
// - StringWrapperElementsAccessor
// - FastStringWrapperElementsAccessor
// - SlowStringWrapperElementsAccessor
namespace v8 {
namespace internal {
namespace {
static const int kPackedSizeNotKnown = -1;
enum Where { AT_START, AT_END };
// First argument in list is the accessor class, the second argument is the
// accessor ElementsKind, and the third is the backing store class. Use the
// fast element handler for smi-only arrays. The implementation is currently
// identical. Note that the order must match that of the ElementsKind enum for
// the |accessor_array[]| below to work.
#define ELEMENTS_LIST(V) \
V(FastPackedSmiElementsAccessor, FAST_SMI_ELEMENTS, FixedArray) \
V(FastHoleySmiElementsAccessor, FAST_HOLEY_SMI_ELEMENTS, FixedArray) \
V(FastPackedObjectElementsAccessor, FAST_ELEMENTS, FixedArray) \
V(FastHoleyObjectElementsAccessor, FAST_HOLEY_ELEMENTS, FixedArray) \
V(FastPackedDoubleElementsAccessor, FAST_DOUBLE_ELEMENTS, FixedDoubleArray) \
V(FastHoleyDoubleElementsAccessor, FAST_HOLEY_DOUBLE_ELEMENTS, \
FixedDoubleArray) \
V(DictionaryElementsAccessor, DICTIONARY_ELEMENTS, SeededNumberDictionary) \
V(FastSloppyArgumentsElementsAccessor, FAST_SLOPPY_ARGUMENTS_ELEMENTS, \
FixedArray) \
V(SlowSloppyArgumentsElementsAccessor, SLOW_SLOPPY_ARGUMENTS_ELEMENTS, \
FixedArray) \
V(FastStringWrapperElementsAccessor, FAST_STRING_WRAPPER_ELEMENTS, \
FixedArray) \
V(SlowStringWrapperElementsAccessor, SLOW_STRING_WRAPPER_ELEMENTS, \
FixedArray) \
V(FixedUint8ElementsAccessor, UINT8_ELEMENTS, FixedUint8Array) \
V(FixedInt8ElementsAccessor, INT8_ELEMENTS, FixedInt8Array) \
V(FixedUint16ElementsAccessor, UINT16_ELEMENTS, FixedUint16Array) \
V(FixedInt16ElementsAccessor, INT16_ELEMENTS, FixedInt16Array) \
V(FixedUint32ElementsAccessor, UINT32_ELEMENTS, FixedUint32Array) \
V(FixedInt32ElementsAccessor, INT32_ELEMENTS, FixedInt32Array) \
V(FixedFloat32ElementsAccessor, FLOAT32_ELEMENTS, FixedFloat32Array) \
V(FixedFloat64ElementsAccessor, FLOAT64_ELEMENTS, FixedFloat64Array) \
V(FixedUint8ClampedElementsAccessor, UINT8_CLAMPED_ELEMENTS, \
FixedUint8ClampedArray)
template<ElementsKind Kind> class ElementsKindTraits {
public:
typedef FixedArrayBase BackingStore;
};
#define ELEMENTS_TRAITS(Class, KindParam, Store) \
template<> class ElementsKindTraits<KindParam> { \
public: /* NOLINT */ \
static const ElementsKind Kind = KindParam; \
typedef Store BackingStore; \
};
ELEMENTS_LIST(ELEMENTS_TRAITS)
#undef ELEMENTS_TRAITS
MUST_USE_RESULT
MaybeHandle<Object> ThrowArrayLengthRangeError(Isolate* isolate) {
THROW_NEW_ERROR(isolate, NewRangeError(MessageTemplate::kInvalidArrayLength),
Object);
}
void CopyObjectToObjectElements(FixedArrayBase* from_base,
ElementsKind from_kind, uint32_t from_start,
FixedArrayBase* to_base, ElementsKind to_kind,
uint32_t to_start, int raw_copy_size) {
DCHECK(to_base->map() !=
from_base->GetIsolate()->heap()->fixed_cow_array_map());
DisallowHeapAllocation no_allocation;
int copy_size = raw_copy_size;
if (raw_copy_size < 0) {
DCHECK(raw_copy_size == ElementsAccessor::kCopyToEnd ||
raw_copy_size == ElementsAccessor::kCopyToEndAndInitializeToHole);
copy_size = Min(from_base->length() - from_start,
to_base->length() - to_start);
if (raw_copy_size == ElementsAccessor::kCopyToEndAndInitializeToHole) {
int start = to_start + copy_size;
int length = to_base->length() - start;
if (length > 0) {
Heap* heap = from_base->GetHeap();
MemsetPointer(FixedArray::cast(to_base)->data_start() + start,
heap->the_hole_value(), length);
}
}
}
DCHECK((copy_size + static_cast<int>(to_start)) <= to_base->length() &&
(copy_size + static_cast<int>(from_start)) <= from_base->length());
if (copy_size == 0) return;
FixedArray* from = FixedArray::cast(from_base);
FixedArray* to = FixedArray::cast(to_base);
DCHECK(IsFastSmiOrObjectElementsKind(from_kind));
DCHECK(IsFastSmiOrObjectElementsKind(to_kind));
WriteBarrierMode write_barrier_mode =
(IsFastObjectElementsKind(from_kind) && IsFastObjectElementsKind(to_kind))
? UPDATE_WRITE_BARRIER
: SKIP_WRITE_BARRIER;
for (int i = 0; i < copy_size; i++) {
Object* value = from->get(from_start + i);
to->set(to_start + i, value, write_barrier_mode);
}
}
static void CopyDictionaryToObjectElements(
FixedArrayBase* from_base, uint32_t from_start, FixedArrayBase* to_base,
ElementsKind to_kind, uint32_t to_start, int raw_copy_size) {
DisallowHeapAllocation no_allocation;
SeededNumberDictionary* from = SeededNumberDictionary::cast(from_base);
int copy_size = raw_copy_size;
if (raw_copy_size < 0) {
DCHECK(raw_copy_size == ElementsAccessor::kCopyToEnd ||
raw_copy_size == ElementsAccessor::kCopyToEndAndInitializeToHole);
copy_size = from->max_number_key() + 1 - from_start;
if (raw_copy_size == ElementsAccessor::kCopyToEndAndInitializeToHole) {
int start = to_start + copy_size;
int length = to_base->length() - start;
if (length > 0) {
Heap* heap = from->GetHeap();
MemsetPointer(FixedArray::cast(to_base)->data_start() + start,
heap->the_hole_value(), length);
}
}
}
DCHECK(to_base != from_base);
DCHECK(IsFastSmiOrObjectElementsKind(to_kind));
if (copy_size == 0) return;
FixedArray* to = FixedArray::cast(to_base);
uint32_t to_length = to->length();
if (to_start + copy_size > to_length) {
copy_size = to_length - to_start;
}
WriteBarrierMode write_barrier_mode = IsFastObjectElementsKind(to_kind)
? UPDATE_WRITE_BARRIER
: SKIP_WRITE_BARRIER;
Isolate* isolate = from->GetIsolate();
for (int i = 0; i < copy_size; i++) {
int entry = from->FindEntry(i + from_start);
if (entry != SeededNumberDictionary::kNotFound) {
Object* value = from->ValueAt(entry);
DCHECK(!value->IsTheHole(isolate));
to->set(i + to_start, value, write_barrier_mode);
} else {
to->set_the_hole(isolate, i + to_start);
}
}
}
// NOTE: this method violates the handlified function signature convention:
// raw pointer parameters in the function that allocates.
// See ElementsAccessorBase::CopyElements() for details.
static void CopyDoubleToObjectElements(FixedArrayBase* from_base,
uint32_t from_start,
FixedArrayBase* to_base,
uint32_t to_start, int raw_copy_size) {
int copy_size = raw_copy_size;
if (raw_copy_size < 0) {
DisallowHeapAllocation no_allocation;
DCHECK(raw_copy_size == ElementsAccessor::kCopyToEnd ||
raw_copy_size == ElementsAccessor::kCopyToEndAndInitializeToHole);
copy_size = Min(from_base->length() - from_start,
to_base->length() - to_start);
if (raw_copy_size == ElementsAccessor::kCopyToEndAndInitializeToHole) {
// Also initialize the area that will be copied over since HeapNumber
// allocation below can cause an incremental marking step, requiring all
// existing heap objects to be propertly initialized.
int start = to_start;
int length = to_base->length() - start;
if (length > 0) {
Heap* heap = from_base->GetHeap();
MemsetPointer(FixedArray::cast(to_base)->data_start() + start,
heap->the_hole_value(), length);
}
}
}
DCHECK((copy_size + static_cast<int>(to_start)) <= to_base->length() &&
(copy_size + static_cast<int>(from_start)) <= from_base->length());
if (copy_size == 0) return;
// From here on, the code below could actually allocate. Therefore the raw
// values are wrapped into handles.
Isolate* isolate = from_base->GetIsolate();
Handle<FixedDoubleArray> from(FixedDoubleArray::cast(from_base), isolate);
Handle<FixedArray> to(FixedArray::cast(to_base), isolate);
// Use an outer loop to not waste too much time on creating HandleScopes.
// On the other hand we might overflow a single handle scope depending on
// the copy_size.
int offset = 0;
while (offset < copy_size) {
HandleScope scope(isolate);
offset += 100;
for (int i = offset - 100; i < offset && i < copy_size; ++i) {
Handle<Object> value =
FixedDoubleArray::get(*from, i + from_start, isolate);
to->set(i + to_start, *value, UPDATE_WRITE_BARRIER);
}
}
}
static void CopyDoubleToDoubleElements(FixedArrayBase* from_base,
uint32_t from_start,
FixedArrayBase* to_base,
uint32_t to_start, int raw_copy_size) {
DisallowHeapAllocation no_allocation;
int copy_size = raw_copy_size;
if (raw_copy_size < 0) {
DCHECK(raw_copy_size == ElementsAccessor::kCopyToEnd ||
raw_copy_size == ElementsAccessor::kCopyToEndAndInitializeToHole);
copy_size = Min(from_base->length() - from_start,
to_base->length() - to_start);
if (raw_copy_size == ElementsAccessor::kCopyToEndAndInitializeToHole) {
for (int i = to_start + copy_size; i < to_base->length(); ++i) {
FixedDoubleArray::cast(to_base)->set_the_hole(i);
}
}
}
DCHECK((copy_size + static_cast<int>(to_start)) <= to_base->length() &&
(copy_size + static_cast<int>(from_start)) <= from_base->length());
if (copy_size == 0) return;
FixedDoubleArray* from = FixedDoubleArray::cast(from_base);
FixedDoubleArray* to = FixedDoubleArray::cast(to_base);
Address to_address = to->address() + FixedDoubleArray::kHeaderSize;
Address from_address = from->address() + FixedDoubleArray::kHeaderSize;
to_address += kDoubleSize * to_start;
from_address += kDoubleSize * from_start;
int words_per_double = (kDoubleSize / kPointerSize);
CopyWords(reinterpret_cast<Object**>(to_address),
reinterpret_cast<Object**>(from_address),
static_cast<size_t>(words_per_double * copy_size));
}
static void CopySmiToDoubleElements(FixedArrayBase* from_base,
uint32_t from_start,
FixedArrayBase* to_base, uint32_t to_start,
int raw_copy_size) {
DisallowHeapAllocation no_allocation;
int copy_size = raw_copy_size;
if (raw_copy_size < 0) {
DCHECK(raw_copy_size == ElementsAccessor::kCopyToEnd ||
raw_copy_size == ElementsAccessor::kCopyToEndAndInitializeToHole);
copy_size = from_base->length() - from_start;
if (raw_copy_size == ElementsAccessor::kCopyToEndAndInitializeToHole) {
for (int i = to_start + copy_size; i < to_base->length(); ++i) {
FixedDoubleArray::cast(to_base)->set_the_hole(i);
}
}
}
DCHECK((copy_size + static_cast<int>(to_start)) <= to_base->length() &&
(copy_size + static_cast<int>(from_start)) <= from_base->length());
if (copy_size == 0) return;
FixedArray* from = FixedArray::cast(from_base);
FixedDoubleArray* to = FixedDoubleArray::cast(to_base);
Object* the_hole = from->GetHeap()->the_hole_value();
for (uint32_t from_end = from_start + static_cast<uint32_t>(copy_size);
from_start < from_end; from_start++, to_start++) {
Object* hole_or_smi = from->get(from_start);
if (hole_or_smi == the_hole) {
to->set_the_hole(to_start);
} else {
to->set(to_start, Smi::cast(hole_or_smi)->value());
}
}
}
static void CopyPackedSmiToDoubleElements(FixedArrayBase* from_base,
uint32_t from_start,
FixedArrayBase* to_base,
uint32_t to_start, int packed_size,
int raw_copy_size) {
DisallowHeapAllocation no_allocation;
int copy_size = raw_copy_size;
uint32_t to_end;
if (raw_copy_size < 0) {
DCHECK(raw_copy_size == ElementsAccessor::kCopyToEnd ||
raw_copy_size == ElementsAccessor::kCopyToEndAndInitializeToHole);
copy_size = packed_size - from_start;
if (raw_copy_size == ElementsAccessor::kCopyToEndAndInitializeToHole) {
to_end = to_base->length();
for (uint32_t i = to_start + copy_size; i < to_end; ++i) {
FixedDoubleArray::cast(to_base)->set_the_hole(i);
}
} else {
to_end = to_start + static_cast<uint32_t>(copy_size);
}
} else {
to_end = to_start + static_cast<uint32_t>(copy_size);
}
DCHECK(static_cast<int>(to_end) <= to_base->length());
DCHECK(packed_size >= 0 && packed_size <= copy_size);
DCHECK((copy_size + static_cast<int>(to_start)) <= to_base->length() &&
(copy_size + static_cast<int>(from_start)) <= from_base->length());
if (copy_size == 0) return;
FixedArray* from = FixedArray::cast(from_base);
FixedDoubleArray* to = FixedDoubleArray::cast(to_base);
for (uint32_t from_end = from_start + static_cast<uint32_t>(packed_size);
from_start < from_end; from_start++, to_start++) {
Object* smi = from->get(from_start);
DCHECK(!smi->IsTheHole(from->GetIsolate()));
to->set(to_start, Smi::cast(smi)->value());
}
}
static void CopyObjectToDoubleElements(FixedArrayBase* from_base,
uint32_t from_start,
FixedArrayBase* to_base,
uint32_t to_start, int raw_copy_size) {
DisallowHeapAllocation no_allocation;
int copy_size = raw_copy_size;
if (raw_copy_size < 0) {
DCHECK(raw_copy_size == ElementsAccessor::kCopyToEnd ||
raw_copy_size == ElementsAccessor::kCopyToEndAndInitializeToHole);
copy_size = from_base->length() - from_start;
if (raw_copy_size == ElementsAccessor::kCopyToEndAndInitializeToHole) {
for (int i = to_start + copy_size; i < to_base->length(); ++i) {
FixedDoubleArray::cast(to_base)->set_the_hole(i);
}
}
}
DCHECK((copy_size + static_cast<int>(to_start)) <= to_base->length() &&
(copy_size + static_cast<int>(from_start)) <= from_base->length());
if (copy_size == 0) return;
FixedArray* from = FixedArray::cast(from_base);
FixedDoubleArray* to = FixedDoubleArray::cast(to_base);
Object* the_hole = from->GetHeap()->the_hole_value();
for (uint32_t from_end = from_start + copy_size;
from_start < from_end; from_start++, to_start++) {
Object* hole_or_object = from->get(from_start);
if (hole_or_object == the_hole) {
to->set_the_hole(to_start);
} else {
to->set(to_start, hole_or_object->Number());
}
}
}
static void CopyDictionaryToDoubleElements(FixedArrayBase* from_base,
uint32_t from_start,
FixedArrayBase* to_base,
uint32_t to_start,
int raw_copy_size) {
DisallowHeapAllocation no_allocation;
SeededNumberDictionary* from = SeededNumberDictionary::cast(from_base);
int copy_size = raw_copy_size;
if (copy_size < 0) {
DCHECK(copy_size == ElementsAccessor::kCopyToEnd ||
copy_size == ElementsAccessor::kCopyToEndAndInitializeToHole);
copy_size = from->max_number_key() + 1 - from_start;
if (raw_copy_size == ElementsAccessor::kCopyToEndAndInitializeToHole) {
for (int i = to_start + copy_size; i < to_base->length(); ++i) {
FixedDoubleArray::cast(to_base)->set_the_hole(i);
}
}
}
if (copy_size == 0) return;
FixedDoubleArray* to = FixedDoubleArray::cast(to_base);
uint32_t to_length = to->length();
if (to_start + copy_size > to_length) {
copy_size = to_length - to_start;
}
for (int i = 0; i < copy_size; i++) {
int entry = from->FindEntry(i + from_start);
if (entry != SeededNumberDictionary::kNotFound) {
to->set(i + to_start, from->ValueAt(entry)->Number());
} else {
to->set_the_hole(i + to_start);
}
}
}
static void TraceTopFrame(Isolate* isolate) {
StackFrameIterator it(isolate);
if (it.done()) {
PrintF("unknown location (no JavaScript frames present)");
return;
}
StackFrame* raw_frame = it.frame();
if (raw_frame->is_internal()) {
Code* apply_builtin =
isolate->builtins()->builtin(Builtins::kFunctionPrototypeApply);
if (raw_frame->unchecked_code() == apply_builtin) {
PrintF("apply from ");
it.Advance();
raw_frame = it.frame();
}
}
JavaScriptFrame::PrintTop(isolate, stdout, false, true);
}
static void SortIndices(
Handle<FixedArray> indices, uint32_t sort_size,
WriteBarrierMode write_barrier_mode = UPDATE_WRITE_BARRIER) {
struct {
bool operator()(Object* a, Object* b) {
if (a->IsSmi() || !a->IsUndefined(HeapObject::cast(a)->GetIsolate())) {
if (!b->IsSmi() && b->IsUndefined(HeapObject::cast(b)->GetIsolate())) {
return true;
}
return a->Number() < b->Number();
}
return !b->IsSmi() && b->IsUndefined(HeapObject::cast(b)->GetIsolate());
}
} cmp;
Object** start =
reinterpret_cast<Object**>(indices->GetFirstElementAddress());
std::sort(start, start + sort_size, cmp);
if (write_barrier_mode != SKIP_WRITE_BARRIER) {
FIXED_ARRAY_ELEMENTS_WRITE_BARRIER(indices->GetIsolate()->heap(), *indices,
0, sort_size);
}
}
static Maybe<bool> IncludesValueSlowPath(Isolate* isolate,
Handle<JSObject> receiver,
Handle<Object> value,
uint32_t start_from, uint32_t length) {
bool search_for_hole = value->IsUndefined(isolate);
for (uint32_t k = start_from; k < length; ++k) {
LookupIterator it(isolate, receiver, k);
if (!it.IsFound()) {
if (search_for_hole) return Just(true);
continue;
}
Handle<Object> element_k;
ASSIGN_RETURN_ON_EXCEPTION_VALUE(isolate, element_k,
Object::GetProperty(&it), Nothing<bool>());
if (value->SameValueZero(*element_k)) return Just(true);
}
return Just(false);
}
static Maybe<int64_t> IndexOfValueSlowPath(Isolate* isolate,
Handle<JSObject> receiver,
Handle<Object> value,
uint32_t start_from,
uint32_t length) {
for (uint32_t k = start_from; k < length; ++k) {
LookupIterator it(isolate, receiver, k);
if (!it.IsFound()) {
continue;
}
Handle<Object> element_k;
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, element_k, Object::GetProperty(&it), Nothing<int64_t>());
if (value->StrictEquals(*element_k)) return Just<int64_t>(k);
}
return Just<int64_t>(-1);
}
// Base class for element handler implementations. Contains the
// the common logic for objects with different ElementsKinds.
// Subclasses must specialize method for which the element
// implementation differs from the base class implementation.
//
// This class is intended to be used in the following way:
//
// class SomeElementsAccessor :
// public ElementsAccessorBase<SomeElementsAccessor,
// BackingStoreClass> {
// ...
// }
//
// This is an example of the Curiously Recurring Template Pattern (see
// http://en.wikipedia.org/wiki/Curiously_recurring_template_pattern). We use
// CRTP to guarantee aggressive compile time optimizations (i.e. inlining and
// specialization of SomeElementsAccessor methods).
template <typename Subclass, typename ElementsTraitsParam>
class ElementsAccessorBase : public ElementsAccessor {
public:
explicit ElementsAccessorBase(const char* name)
: ElementsAccessor(name) { }
typedef ElementsTraitsParam ElementsTraits;
typedef typename ElementsTraitsParam::BackingStore BackingStore;
static ElementsKind kind() { return ElementsTraits::Kind; }
static void ValidateContents(Handle<JSObject> holder, int length) {
}
static void ValidateImpl(Handle<JSObject> holder) {
Handle<FixedArrayBase> fixed_array_base(holder->elements());
if (!fixed_array_base->IsHeapObject()) return;
// Arrays that have been shifted in place can't be verified.
if (fixed_array_base->IsFiller()) return;
int length = 0;
if (holder->IsJSArray()) {
Object* length_obj = Handle<JSArray>::cast(holder)->length();
if (length_obj->IsSmi()) {
length = Smi::cast(length_obj)->value();
}
} else {
length = fixed_array_base->length();
}
Subclass::ValidateContents(holder, length);
}
void Validate(Handle<JSObject> holder) final {
DisallowHeapAllocation no_gc;
Subclass::ValidateImpl(holder);
}
static bool IsPackedImpl(Handle<JSObject> holder,
Handle<FixedArrayBase> backing_store, uint32_t start,
uint32_t end) {
if (IsFastPackedElementsKind(kind())) return true;
Isolate* isolate = backing_store->GetIsolate();
for (uint32_t i = start; i < end; i++) {
if (!Subclass::HasElementImpl(isolate, holder, i, backing_store,
ALL_PROPERTIES)) {
return false;
}
}
return true;
}
static void TryTransitionResultArrayToPacked(Handle<JSArray> array) {
if (!IsHoleyElementsKind(kind())) return;
int length = Smi::cast(array->length())->value();
Handle<FixedArrayBase> backing_store(array->elements());
if (!Subclass::IsPackedImpl(array, backing_store, 0, length)) {
return;
}
ElementsKind packed_kind = GetPackedElementsKind(kind());
Handle<Map> new_map =
JSObject::GetElementsTransitionMap(array, packed_kind);
JSObject::MigrateToMap(array, new_map);
if (FLAG_trace_elements_transitions) {
JSObject::PrintElementsTransition(stdout, array, kind(), backing_store,
packed_kind, backing_store);
}
}
bool HasElement(Handle<JSObject> holder, uint32_t index,
Handle<FixedArrayBase> backing_store,
PropertyFilter filter) final {
return Subclass::HasElementImpl(holder->GetIsolate(), holder, index,
backing_store, filter);
}
static bool HasElementImpl(Isolate* isolate, Handle<JSObject> holder,
uint32_t index,
Handle<FixedArrayBase> backing_store,
PropertyFilter filter = ALL_PROPERTIES) {
return Subclass::GetEntryForIndexImpl(isolate, *holder, *backing_store,
index, filter) != kMaxUInt32;
}
bool HasAccessors(JSObject* holder) final {
return Subclass::HasAccessorsImpl(holder, holder->elements());
}
static bool HasAccessorsImpl(JSObject* holder,
FixedArrayBase* backing_store) {
return false;
}
Handle<Object> Get(Handle<JSObject> holder, uint32_t entry) final {
return Subclass::GetInternalImpl(holder, entry);
}
static Handle<Object> GetInternalImpl(Handle<JSObject> holder,
uint32_t entry) {
return Subclass::GetImpl(holder->GetIsolate(), holder->elements(), entry);
}
static Handle<Object> GetImpl(Isolate* isolate, FixedArrayBase* backing_store,
uint32_t entry) {
uint32_t index = GetIndexForEntryImpl(backing_store, entry);
return handle(BackingStore::cast(backing_store)->get(index), isolate);
}
void Set(Handle<JSObject> holder, uint32_t entry, Object* value) final {
Subclass::SetImpl(holder, entry, value);
}
void Reconfigure(Handle<JSObject> object, Handle<FixedArrayBase> store,
uint32_t entry, Handle<Object> value,
PropertyAttributes attributes) final {
Subclass::ReconfigureImpl(object, store, entry, value, attributes);
}
static void ReconfigureImpl(Handle<JSObject> object,
Handle<FixedArrayBase> store, uint32_t entry,
Handle<Object> value,
PropertyAttributes attributes) {
UNREACHABLE();
}
void Add(Handle<JSObject> object, uint32_t index, Handle<Object> value,
PropertyAttributes attributes, uint32_t new_capacity) final {
Subclass::AddImpl(object, index, value, attributes, new_capacity);
}
static void AddImpl(Handle<JSObject> object, uint32_t index,
Handle<Object> value, PropertyAttributes attributes,
uint32_t new_capacity) {
UNREACHABLE();
}
uint32_t Push(Handle<JSArray> receiver, Arguments* args,
uint32_t push_size) final {
return Subclass::PushImpl(receiver, args, push_size);
}
static uint32_t PushImpl(Handle<JSArray> receiver, Arguments* args,
uint32_t push_sized) {
UNREACHABLE();
return 0;
}
uint32_t Unshift(Handle<JSArray> receiver, Arguments* args,
uint32_t unshift_size) final {
return Subclass::UnshiftImpl(receiver, args, unshift_size);
}
static uint32_t UnshiftImpl(Handle<JSArray> receiver, Arguments* args,
uint32_t unshift_size) {
UNREACHABLE();
return 0;
}
Handle<JSArray> Slice(Handle<JSObject> receiver, uint32_t start,
uint32_t end) final {
return Subclass::SliceImpl(receiver, start, end);
}
static Handle<JSArray> SliceImpl(Handle<JSObject> receiver,
uint32_t start, uint32_t end) {
UNREACHABLE();
return Handle<JSArray>();
}
Handle<JSArray> Splice(Handle<JSArray> receiver, uint32_t start,
uint32_t delete_count, Arguments* args,
uint32_t add_count) final {
return Subclass::SpliceImpl(receiver, start, delete_count, args, add_count);
}
static Handle<JSArray> SpliceImpl(Handle<JSArray> receiver,
uint32_t start, uint32_t delete_count,
Arguments* args, uint32_t add_count) {
UNREACHABLE();
return Handle<JSArray>();
}
Handle<Object> Pop(Handle<JSArray> receiver) final {
return Subclass::PopImpl(receiver);
}
static Handle<Object> PopImpl(Handle<JSArray> receiver) {
UNREACHABLE();
return Handle<Object>();
}
Handle<Object> Shift(Handle<JSArray> receiver) final {
return Subclass::ShiftImpl(receiver);
}
static Handle<Object> ShiftImpl(Handle<JSArray> receiver) {
UNREACHABLE();
return Handle<Object>();
}
void SetLength(Handle<JSArray> array, uint32_t length) final {
Subclass::SetLengthImpl(array->GetIsolate(), array, length,
handle(array->elements()));
}
static void SetLengthImpl(Isolate* isolate, Handle<JSArray> array,
uint32_t length,
Handle<FixedArrayBase> backing_store) {
DCHECK(!array->SetLengthWouldNormalize(length));
DCHECK(IsFastElementsKind(array->GetElementsKind()));
uint32_t old_length = 0;
CHECK(array->length()->ToArrayIndex(&old_length));
if (old_length < length) {
ElementsKind kind = array->GetElementsKind();
if (!IsFastHoleyElementsKind(kind)) {
kind = GetHoleyElementsKind(kind);
JSObject::TransitionElementsKind(array, kind);
}
}
// Check whether the backing store should be shrunk.
uint32_t capacity = backing_store->length();
old_length = Min(old_length, capacity);
if (length == 0) {
array->initialize_elements();
} else if (length <= capacity) {
if (IsFastSmiOrObjectElementsKind(kind())) {
JSObject::EnsureWritableFastElements(array);
if (array->elements() != *backing_store) {
backing_store = handle(array->elements(), isolate);
}
}
if (2 * length <= capacity) {
// If more than half the elements won't be used, trim the array.
isolate->heap()->RightTrimFixedArray(*backing_store, capacity - length);
} else {
// Otherwise, fill the unused tail with holes.
BackingStore::cast(*backing_store)->FillWithHoles(length, old_length);
}
} else {
// Check whether the backing store should be expanded.
capacity = Max(length, JSObject::NewElementsCapacity(capacity));
Subclass::GrowCapacityAndConvertImpl(array, capacity);
}
array->set_length(Smi::FromInt(length));
JSObject::ValidateElements(array);
}
uint32_t NumberOfElements(JSObject* receiver) final {
return Subclass::NumberOfElementsImpl(receiver, receiver->elements());
}
static uint32_t NumberOfElementsImpl(JSObject* receiver,
FixedArrayBase* backing_store) {
UNREACHABLE();
}
static uint32_t GetMaxIndex(JSObject* receiver, FixedArrayBase* elements) {
if (receiver->IsJSArray()) {
DCHECK(JSArray::cast(receiver)->length()->IsSmi());
return static_cast<uint32_t>(
Smi::cast(JSArray::cast(receiver)->length())->value());
}
return Subclass::GetCapacityImpl(receiver, elements);
}
static uint32_t GetMaxNumberOfEntries(JSObject* receiver,
FixedArrayBase* elements) {
return Subclass::GetMaxIndex(receiver, elements);
}
static Handle<FixedArrayBase> ConvertElementsWithCapacity(
Handle<JSObject> object, Handle<FixedArrayBase> old_elements,
ElementsKind from_kind, uint32_t capacity) {
return ConvertElementsWithCapacity(
object, old_elements, from_kind, capacity, 0, 0,
ElementsAccessor::kCopyToEndAndInitializeToHole);
}
static Handle<FixedArrayBase> ConvertElementsWithCapacity(
Handle<JSObject> object, Handle<FixedArrayBase> old_elements,
ElementsKind from_kind, uint32_t capacity, int copy_size) {
return ConvertElementsWithCapacity(object, old_elements, from_kind,
capacity, 0, 0, copy_size);
}
static Handle<FixedArrayBase> ConvertElementsWithCapacity(
Handle<JSObject> object, Handle<FixedArrayBase> old_elements,
ElementsKind from_kind, uint32_t capacity, uint32_t src_index,
uint32_t dst_index, int copy_size) {
Isolate* isolate = object->GetIsolate();
Handle<FixedArrayBase> new_elements;
if (IsFastDoubleElementsKind(kind())) {
new_elements = isolate->factory()->NewFixedDoubleArray(capacity);
} else {
new_elements = isolate->factory()->NewUninitializedFixedArray(capacity);
}
int packed_size = kPackedSizeNotKnown;
if (IsFastPackedElementsKind(from_kind) && object->IsJSArray()) {
packed_size = Smi::cast(JSArray::cast(*object)->length())->value();
}
Subclass::CopyElementsImpl(*old_elements, src_index, *new_elements,
from_kind, dst_index, packed_size, copy_size);
return new_elements;
}
static void TransitionElementsKindImpl(Handle<JSObject> object,
Handle<Map> to_map) {
Handle<Map> from_map = handle(object->map());
ElementsKind from_kind = from_map->elements_kind();
ElementsKind to_kind = to_map->elements_kind();
if (IsFastHoleyElementsKind(from_kind)) {
to_kind = GetHoleyElementsKind(to_kind);
}
if (from_kind != to_kind) {
// This method should never be called for any other case.
DCHECK(IsFastElementsKind(from_kind));
DCHECK(IsFastElementsKind(to_kind));
DCHECK_NE(TERMINAL_FAST_ELEMENTS_KIND, from_kind);
Handle<FixedArrayBase> from_elements(object->elements());
if (object->elements() == object->GetHeap()->empty_fixed_array() ||
IsFastDoubleElementsKind(from_kind) ==
IsFastDoubleElementsKind(to_kind)) {
// No change is needed to the elements() buffer, the transition
// only requires a map change.
JSObject::MigrateToMap(object, to_map);
} else {
DCHECK((IsFastSmiElementsKind(from_kind) &&
IsFastDoubleElementsKind(to_kind)) ||
(IsFastDoubleElementsKind(from_kind) &&
IsFastObjectElementsKind(to_kind)));
uint32_t capacity = static_cast<uint32_t>(object->elements()->length());
Handle<FixedArrayBase> elements = ConvertElementsWithCapacity(
object, from_elements, from_kind, capacity);
JSObject::SetMapAndElements(object, to_map, elements);
}
if (FLAG_trace_elements_transitions) {
JSObject::PrintElementsTransition(stdout, object, from_kind,
from_elements, to_kind,
handle(object->elements()));
}
}
}
static void GrowCapacityAndConvertImpl(Handle<JSObject> object,
uint32_t capacity) {
ElementsKind from_kind = object->GetElementsKind();
if (IsFastSmiOrObjectElementsKind(from_kind)) {
// Array optimizations rely on the prototype lookups of Array objects
// always returning undefined. If there is a store to the initial
// prototype object, make sure all of these optimizations are invalidated.
object->GetIsolate()->UpdateArrayProtectorOnSetLength(object);
}
Handle<FixedArrayBase> old_elements(object->elements());
// This method should only be called if there's a reason to update the
// elements.
DCHECK(IsFastDoubleElementsKind(from_kind) !=
IsFastDoubleElementsKind(kind()) ||
IsDictionaryElementsKind(from_kind) ||
static_cast<uint32_t>(old_elements->length()) < capacity);
Subclass::BasicGrowCapacityAndConvertImpl(object, old_elements, from_kind,
kind(), capacity);
}
static void BasicGrowCapacityAndConvertImpl(
Handle<JSObject> object, Handle<FixedArrayBase> old_elements,
ElementsKind from_kind, ElementsKind to_kind, uint32_t capacity) {
Handle<FixedArrayBase> elements =
ConvertElementsWithCapacity(object, old_elements, from_kind, capacity);
if (IsHoleyElementsKind(from_kind)) to_kind = GetHoleyElementsKind(to_kind);
Handle<Map> new_map = JSObject::GetElementsTransitionMap(object, to_kind);
JSObject::SetMapAndElements(object, new_map, elements);
// Transition through the allocation site as well if present.
JSObject::UpdateAllocationSite(object, to_kind);
if (FLAG_trace_elements_transitions) {
JSObject::PrintElementsTransition(stdout, object, from_kind, old_elements,
to_kind, elements);
}
}
void TransitionElementsKind(Handle<JSObject> object, Handle<Map> map) final {
Subclass::TransitionElementsKindImpl(object, map);
}
void GrowCapacityAndConvert(Handle<JSObject> object,
uint32_t capacity) final {
Subclass::GrowCapacityAndConvertImpl(object, capacity);
}
bool GrowCapacity(Handle<JSObject> object, uint32_t index) final {
// This function is intended to be called from optimized code. We don't
// want to trigger lazy deopts there, so refuse to handle cases that would.
if (object->map()->is_prototype_map() ||
object->WouldConvertToSlowElements(index)) {
return false;
}
Handle<FixedArrayBase> old_elements(object->elements());
uint32_t new_capacity = JSObject::NewElementsCapacity(index + 1);
DCHECK(static_cast<uint32_t>(old_elements->length()) < new_capacity);
Handle<FixedArrayBase> elements =
ConvertElementsWithCapacity(object, old_elements, kind(), new_capacity);
DCHECK_EQ(object->GetElementsKind(), kind());
// Transition through the allocation site as well if present.
if (JSObject::UpdateAllocationSite<AllocationSiteUpdateMode::kCheckOnly>(
object, kind())) {
return false;
}
object->set_elements(*elements);
return true;
}
void Delete(Handle<JSObject> obj, uint32_t entry) final {
Subclass::DeleteImpl(obj, entry);
}
static void CopyElementsImpl(FixedArrayBase* from, uint32_t from_start,
FixedArrayBase* to, ElementsKind from_kind,
uint32_t to_start, int packed_size,
int copy_size) {
UNREACHABLE();
}
void CopyElements(JSObject* from_holder, uint32_t from_start,
ElementsKind from_kind, Handle<FixedArrayBase> to,
uint32_t to_start, int copy_size) final {
int packed_size = kPackedSizeNotKnown;
bool is_packed = IsFastPackedElementsKind(from_kind) &&
from_holder->IsJSArray();
if (is_packed) {
packed_size =
Smi::cast(JSArray::cast(from_holder)->length())->value();
if (copy_size >= 0 && packed_size > copy_size) {
packed_size = copy_size;
}
}
FixedArrayBase* from = from_holder->elements();
// NOTE: the Subclass::CopyElementsImpl() methods
// violate the handlified function signature convention:
// raw pointer parameters in the function that allocates. This is done
// intentionally to avoid ArrayConcat() builtin performance degradation.
//
// Details: The idea is that allocations actually happen only in case of
// copying from object with fast double elements to object with object
// elements. In all the other cases there are no allocations performed and
// handle creation causes noticeable performance degradation of the builtin.
Subclass::CopyElementsImpl(from, from_start, *to, from_kind, to_start,
packed_size, copy_size);
}
void CopyElements(Handle<FixedArrayBase> source, ElementsKind source_kind,
Handle<FixedArrayBase> destination, int size) {
Subclass::CopyElementsImpl(*source, 0, *destination, source_kind, 0,
kPackedSizeNotKnown, size);
}
Handle<SeededNumberDictionary> Normalize(Handle<JSObject> object) final {
return Subclass::NormalizeImpl(object, handle(object->elements()));
}
static Handle<SeededNumberDictionary> NormalizeImpl(
Handle<JSObject> object, Handle<FixedArrayBase> elements) {
UNREACHABLE();
return Handle<SeededNumberDictionary>();
}
Maybe<bool> CollectValuesOrEntries(Isolate* isolate, Handle<JSObject> object,
Handle<FixedArray> values_or_entries,
bool get_entries, int* nof_items,
PropertyFilter filter) {
return Subclass::CollectValuesOrEntriesImpl(
isolate, object, values_or_entries, get_entries, nof_items, filter);
}
static Maybe<bool> CollectValuesOrEntriesImpl(
Isolate* isolate, Handle<JSObject> object,
Handle<FixedArray> values_or_entries, bool get_entries, int* nof_items,
PropertyFilter filter) {
int count = 0;
KeyAccumulator accumulator(isolate, KeyCollectionMode::kOwnOnly,
ALL_PROPERTIES);
Subclass::CollectElementIndicesImpl(
object, handle(object->elements(), isolate), &accumulator);
Handle<FixedArray> keys = accumulator.GetKeys();
for (int i = 0; i < keys->length(); ++i) {
Handle<Object> key(keys->get(i), isolate);
Handle<Object> value;
uint32_t index;
if (!key->ToUint32(&index)) continue;
uint32_t entry = Subclass::GetEntryForIndexImpl(
isolate, *object, object->elements(), index, filter);
if (entry == kMaxUInt32) continue;
PropertyDetails details = Subclass::GetDetailsImpl(*object, entry);
if (details.kind() == kData) {
value = Subclass::GetImpl(isolate, object->elements(), entry);
} else {
LookupIterator it(isolate, object, index, LookupIterator::OWN);
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, value, Object::GetProperty(&it), Nothing<bool>());
}
if (get_entries) {
value = MakeEntryPair(isolate, index, value);
}
values_or_entries->set(count++, *value);
}
*nof_items = count;
return Just(true);
}
void CollectElementIndices(Handle<JSObject> object,
Handle<FixedArrayBase> backing_store,
KeyAccumulator* keys) final {
if (keys->filter() & ONLY_ALL_CAN_READ) return;
Subclass::CollectElementIndicesImpl(object, backing_store, keys);
}
static void CollectElementIndicesImpl(Handle<JSObject> object,
Handle<FixedArrayBase> backing_store,
KeyAccumulator* keys) {
DCHECK_NE(DICTIONARY_ELEMENTS, kind());
// Non-dictionary elements can't have all-can-read accessors.
uint32_t length = Subclass::GetMaxIndex(*object, *backing_store);
PropertyFilter filter = keys->filter();
Isolate* isolate = keys->isolate();
Factory* factory = isolate->factory();
for (uint32_t i = 0; i < length; i++) {
if (Subclass::HasElementImpl(isolate, object, i, backing_store, filter)) {
keys->AddKey(factory->NewNumberFromUint(i));
}
}
}
static Handle<FixedArray> DirectCollectElementIndicesImpl(
Isolate* isolate, Handle<JSObject> object,
Handle<FixedArrayBase> backing_store, GetKeysConversion convert,
PropertyFilter filter, Handle<FixedArray> list, uint32_t* nof_indices,
uint32_t insertion_index = 0) {
uint32_t length = Subclass::GetMaxIndex(*object, *backing_store);
for (uint32_t i = 0; i < length; i++) {
if (Subclass::HasElementImpl(isolate, object, i, backing_store, filter)) {
if (convert == GetKeysConversion::kConvertToString) {
Handle<String> index_string = isolate->factory()->Uint32ToString(i);
list->set(insertion_index, *index_string);
} else {
list->set(insertion_index, Smi::FromInt(i), SKIP_WRITE_BARRIER);
}
insertion_index++;
}
}
*nof_indices = insertion_index;
return list;
}
MaybeHandle<FixedArray> PrependElementIndices(
Handle<JSObject> object, Handle<FixedArrayBase> backing_store,
Handle<FixedArray> keys, GetKeysConversion convert,
PropertyFilter filter) final {
return Subclass::PrependElementIndicesImpl(object, backing_store, keys,
convert, filter);
}
static MaybeHandle<FixedArray> PrependElementIndicesImpl(
Handle<JSObject> object, Handle<FixedArrayBase> backing_store,
Handle<FixedArray> keys, GetKeysConversion convert,
PropertyFilter filter) {
Isolate* isolate = object->GetIsolate();
uint32_t nof_property_keys = keys->length();
uint32_t initial_list_length =
Subclass::GetMaxNumberOfEntries(*object, *backing_store);
initial_list_length += nof_property_keys;
if (initial_list_length > FixedArray::kMaxLength ||
initial_list_length < nof_property_keys) {
return isolate->Throw<FixedArray>(isolate->factory()->NewRangeError(
MessageTemplate::kInvalidArrayLength));
}
// Collect the element indices into a new list.
MaybeHandle<FixedArray> raw_array =
isolate->factory()->TryNewFixedArray(initial_list_length);
Handle<FixedArray> combined_keys;
// If we have a holey backing store try to precisely estimate the backing
// store size as a last emergency measure if we cannot allocate the big
// array.
if (!raw_array.ToHandle(&combined_keys)) {
if (IsHoleyElementsKind(kind())) {
// If we overestimate the result list size we might end up in the
// large-object space which doesn't free memory on shrinking the list.
// Hence we try to estimate the final size for holey backing stores more
// precisely here.
initial_list_length =
Subclass::NumberOfElementsImpl(*object, *backing_store);
initial_list_length += nof_property_keys;
}
combined_keys = isolate->factory()->NewFixedArray(initial_list_length);
}
uint32_t nof_indices = 0;
bool needs_sorting =
IsDictionaryElementsKind(kind()) || IsSloppyArgumentsElements(kind());
combined_keys = Subclass::DirectCollectElementIndicesImpl(
isolate, object, backing_store,
needs_sorting ? GetKeysConversion::kKeepNumbers : convert, filter,
combined_keys, &nof_indices);
if (needs_sorting) {
SortIndices(combined_keys, nof_indices);
// Indices from dictionary elements should only be converted after
// sorting.
if (convert == GetKeysConversion::kConvertToString) {
for (uint32_t i = 0; i < nof_indices; i++) {
Handle<Object> index_string = isolate->factory()->Uint32ToString(
combined_keys->get(i)->Number());
combined_keys->set(i, *index_string);
}
}
}
// Copy over the passed-in property keys.
CopyObjectToObjectElements(*keys, FAST_ELEMENTS, 0, *combined_keys,
FAST_ELEMENTS, nof_indices, nof_property_keys);
// For holey elements and arguments we might have to shrink the collected
// keys since the estimates might be off.
if (IsHoleyElementsKind(kind()) || IsSloppyArgumentsElements(kind())) {
// Shrink combined_keys to the final size.
int final_size = nof_indices + nof_property_keys;
DCHECK_LE(final_size, combined_keys->length());
combined_keys->Shrink(final_size);
}
return combined_keys;
}
void AddElementsToKeyAccumulator(Handle<JSObject> receiver,
KeyAccumulator* accumulator,
AddKeyConversion convert) final {
Subclass::AddElementsToKeyAccumulatorImpl(receiver, accumulator, convert);
}
static uint32_t GetCapacityImpl(JSObject* holder,
FixedArrayBase* backing_store) {
return backing_store->length();
}
uint32_t GetCapacity(JSObject* holder, FixedArrayBase* backing_store) final {
return Subclass::GetCapacityImpl(holder, backing_store);
}
static Maybe<bool> IncludesValueImpl(Isolate* isolate,
Handle<JSObject> receiver,
Handle<Object> value,
uint32_t start_from, uint32_t length) {
return IncludesValueSlowPath(isolate, receiver, value, start_from, length);
}
Maybe<bool> IncludesValue(Isolate* isolate, Handle<JSObject> receiver,
Handle<Object> value, uint32_t start_from,
uint32_t length) final {
return Subclass::IncludesValueImpl(isolate, receiver, value, start_from,
length);
}
static Maybe<int64_t> IndexOfValueImpl(Isolate* isolate,
Handle<JSObject> receiver,
Handle<Object> value,
uint32_t start_from, uint32_t length) {
return IndexOfValueSlowPath(isolate, receiver, value, start_from, length);
}
Maybe<int64_t> IndexOfValue(Isolate* isolate, Handle<JSObject> receiver,
Handle<Object> value, uint32_t start_from,
uint32_t length) final {
return Subclass::IndexOfValueImpl(isolate, receiver, value, start_from,
length);
}
static uint32_t GetIndexForEntryImpl(FixedArrayBase* backing_store,
uint32_t entry) {
return entry;
}
static uint32_t GetEntryForIndexImpl(Isolate* isolate, JSObject* holder,
FixedArrayBase* backing_store,
uint32_t index, PropertyFilter filter) {
uint32_t length = Subclass::GetMaxIndex(holder, backing_store);
if (IsHoleyElementsKind(kind())) {
return index < length &&
!BackingStore::cast(backing_store)
->is_the_hole(isolate, index)
? index
: kMaxUInt32;
} else {
return index < length ? index : kMaxUInt32;
}
}
uint32_t GetEntryForIndex(Isolate* isolate, JSObject* holder,
FixedArrayBase* backing_store,
uint32_t index) final {
return Subclass::GetEntryForIndexImpl(isolate, holder, backing_store, index,
ALL_PROPERTIES);
}
static PropertyDetails GetDetailsImpl(FixedArrayBase* backing_store,
uint32_t entry) {
return PropertyDetails(NONE, DATA, 0, PropertyCellType::kNoCell);
}
static PropertyDetails GetDetailsImpl(JSObject* holder, uint32_t entry) {
return PropertyDetails(NONE, DATA, 0, PropertyCellType::kNoCell);
}
PropertyDetails GetDetails(JSObject* holder, uint32_t entry) final {
return Subclass::GetDetailsImpl(holder, entry);
}
Handle<FixedArray> CreateListFromArray(Isolate* isolate,
Handle<JSArray> array) final {
return Subclass::CreateListFromArrayImpl(isolate, array);
};
static Handle<FixedArray> CreateListFromArrayImpl(Isolate* isolate,
Handle<JSArray> array) {
UNREACHABLE();
return Handle<FixedArray>();
}
private:
DISALLOW_COPY_AND_ASSIGN(ElementsAccessorBase);
};
class DictionaryElementsAccessor
: public ElementsAccessorBase<DictionaryElementsAccessor,
ElementsKindTraits<DICTIONARY_ELEMENTS> > {
public:
explicit DictionaryElementsAccessor(const char* name)
: ElementsAccessorBase<DictionaryElementsAccessor,
ElementsKindTraits<DICTIONARY_ELEMENTS> >(name) {}
static uint32_t GetMaxIndex(JSObject* receiver, FixedArrayBase* elements) {
// We cannot properly estimate this for dictionaries.
UNREACHABLE();
}
static uint32_t GetMaxNumberOfEntries(JSObject* receiver,
FixedArrayBase* backing_store) {
return NumberOfElementsImpl(receiver, backing_store);
}
static uint32_t NumberOfElementsImpl(JSObject* receiver,
FixedArrayBase* backing_store) {
SeededNumberDictionary* dict = SeededNumberDictionary::cast(backing_store);
return dict->NumberOfElements();
}
static void SetLengthImpl(Isolate* isolate, Handle<JSArray> array,
uint32_t length,
Handle<FixedArrayBase> backing_store) {
Handle<SeededNumberDictionary> dict =
Handle<SeededNumberDictionary>::cast(backing_store);
int capacity = dict->Capacity();
uint32_t old_length = 0;
CHECK(array->length()->ToArrayLength(&old_length));
if (length < old_length) {
if (dict->requires_slow_elements()) {
// Find last non-deletable element in range of elements to be
// deleted and adjust range accordingly.
for (int entry = 0; entry < capacity; entry++) {
DisallowHeapAllocation no_gc;
Object* index = dict->KeyAt(entry);
if (index->IsNumber()) {
uint32_t number = static_cast<uint32_t>(index->Number());
if (length <= number && number < old_length) {
PropertyDetails details = dict->DetailsAt(entry);
if (!details.IsConfigurable()) length = number + 1;
}
}
}
}
if (length == 0) {
// Flush the backing store.
JSObject::ResetElements(array);
} else {
DisallowHeapAllocation no_gc;
// Remove elements that should be deleted.
int removed_entries = 0;
Handle<Object> the_hole_value = isolate->factory()->the_hole_value();
for (int entry = 0; entry < capacity; entry++) {
Object* index = dict->KeyAt(entry);
if (index->IsNumber()) {
uint32_t number = static_cast<uint32_t>(index->Number());
if (length <= number && number < old_length) {
dict->SetEntry(entry, the_hole_value, the_hole_value);
removed_entries++;
}
}
}
// Update the number of elements.
dict->ElementsRemoved(removed_entries);
}
}
Handle<Object> length_obj = isolate->factory()->NewNumberFromUint(length);
array->set_length(*length_obj);
}
static void CopyElementsImpl(FixedArrayBase* from, uint32_t from_start,
FixedArrayBase* to, ElementsKind from_kind,
uint32_t to_start, int packed_size,
int copy_size) {
UNREACHABLE();
}
static void DeleteImpl(Handle<JSObject> obj, uint32_t entry) {
// TODO(verwaest): Remove reliance on index in Shrink.
Handle<SeededNumberDictionary> dict(
SeededNumberDictionary::cast(obj->elements()));
uint32_t index = GetIndexForEntryImpl(*dict, entry);
Handle<Object> result = SeededNumberDictionary::DeleteProperty(dict, entry);
USE(result);
DCHECK(result->IsTrue(dict->GetIsolate()));
Handle<FixedArray> new_elements =
SeededNumberDictionary::Shrink(dict, index);
obj->set_elements(*new_elements);
}
static bool HasAccessorsImpl(JSObject* holder,
FixedArrayBase* backing_store) {
DisallowHeapAllocation no_gc;
SeededNumberDictionary* dict = SeededNumberDictionary::cast(backing_store);
if (!dict->requires_slow_elements()) return false;
int capacity = dict->Capacity();
Isolate* isolate = dict->GetIsolate();
for (int i = 0; i < capacity; i++) {
Object* key = dict->KeyAt(i);
if (!dict->IsKey(isolate, key)) continue;
DCHECK(!dict->IsDeleted(i));
PropertyDetails details = dict->DetailsAt(i);
if (details.kind() == kAccessor) return true;
}
return false;
}
static Object* GetRaw(FixedArrayBase* store, uint32_t entry) {
SeededNumberDictionary* backing_store = SeededNumberDictionary::cast(store);
return backing_store->ValueAt(entry);
}
static Handle<Object> GetImpl(Isolate* isolate, FixedArrayBase* backing_store,
uint32_t entry) {
return handle(GetRaw(backing_store, entry), isolate);
}
static inline void SetImpl(Handle<JSObject> holder, uint32_t entry,
Object* value) {
SetImpl(holder->elements(), entry, value);
}
static inline void SetImpl(FixedArrayBase* backing_store, uint32_t entry,
Object* value) {
SeededNumberDictionary::cast(backing_store)->ValueAtPut(entry, value);
}
static void ReconfigureImpl(Handle<JSObject> object,
Handle<FixedArrayBase> store, uint32_t entry,
Handle<Object> value,
PropertyAttributes attributes) {
SeededNumberDictionary* dictionary = SeededNumberDictionary::cast(*store);
if (attributes != NONE) object->RequireSlowElements(dictionary);
dictionary->ValueAtPut(entry, *value);
PropertyDetails details = dictionary->DetailsAt(entry);
details = PropertyDetails(attributes, DATA, details.dictionary_index(),
PropertyCellType::kNoCell);
dictionary->DetailsAtPut(entry, details);
}
static void AddImpl(Handle<JSObject> object, uint32_t index,
Handle<Object> value, PropertyAttributes attributes,
uint32_t new_capacity) {
PropertyDetails details(attributes, DATA, 0, PropertyCellType::kNoCell);
Handle<SeededNumberDictionary> dictionary =
object->HasFastElements() || object->HasFastStringWrapperElements()
? JSObject::NormalizeElements(object)
: handle(SeededNumberDictionary::cast(object->elements()));
Handle<SeededNumberDictionary> new_dictionary =
SeededNumberDictionary::AddNumberEntry(dictionary, index, value,
details, object);
if (attributes != NONE) object->RequireSlowElements(*new_dictionary);
if (dictionary.is_identical_to(new_dictionary)) return;
object->set_elements(*new_dictionary);
}
static bool HasEntryImpl(Isolate* isolate, FixedArrayBase* store,
uint32_t entry) {
DisallowHeapAllocation no_gc;
SeededNumberDictionary* dict = SeededNumberDictionary::cast(store);
Object* index = dict->KeyAt(entry);
return !index->IsTheHole(isolate);
}
static uint32_t GetIndexForEntryImpl(FixedArrayBase* store, uint32_t entry) {
DisallowHeapAllocation no_gc;
SeededNumberDictionary* dict = SeededNumberDictionary::cast(store);
uint32_t result = 0;
CHECK(dict->KeyAt(entry)->ToArrayIndex(&result));
return result;
}
static uint32_t GetEntryForIndexImpl(Isolate* isolate, JSObject* holder,
FixedArrayBase* store, uint32_t index,
PropertyFilter filter) {
DisallowHeapAllocation no_gc;
SeededNumberDictionary* dictionary = SeededNumberDictionary::cast(store);
int entry = dictionary->FindEntry(isolate, index);
if (entry == SeededNumberDictionary::kNotFound) return kMaxUInt32;
if (filter != ALL_PROPERTIES) {
PropertyDetails details = dictionary->DetailsAt(entry);
PropertyAttributes attr = details.attributes();
if ((attr & filter) != 0) return kMaxUInt32;
}
return static_cast<uint32_t>(entry);
}
static PropertyDetails GetDetailsImpl(JSObject* holder, uint32_t entry) {
return GetDetailsImpl(holder->elements(), entry);
}
static PropertyDetails GetDetailsImpl(FixedArrayBase* backing_store,
uint32_t entry) {
return SeededNumberDictionary::cast(backing_store)->DetailsAt(entry);
}
static uint32_t FilterKey(Handle<SeededNumberDictionary> dictionary,
int entry, Object* raw_key, PropertyFilter filter) {
DCHECK(!dictionary->IsDeleted(entry));
DCHECK(raw_key->IsNumber());
DCHECK_LE(raw_key->Number(), kMaxUInt32);
PropertyDetails details = dictionary->DetailsAt(entry);
PropertyAttributes attr = details.attributes();
if ((attr & filter) != 0) return kMaxUInt32;
return static_cast<uint32_t>(raw_key->Number());
}
static uint32_t GetKeyForEntryImpl(Isolate* isolate,
Handle<SeededNumberDictionary> dictionary,
int entry, PropertyFilter filter) {
DisallowHeapAllocation no_gc;
Object* raw_key = dictionary->KeyAt(entry);
if (!dictionary->IsKey(isolate, raw_key)) return kMaxUInt32;
return FilterKey(dictionary, entry, raw_key, filter);
}
static void CollectElementIndicesImpl(Handle<JSObject> object,
Handle<FixedArrayBase> backing_store,
KeyAccumulator* keys) {
if (keys->filter() & SKIP_STRINGS) return;
Isolate* isolate = keys->isolate();
Handle<SeededNumberDictionary> dictionary =
Handle<SeededNumberDictionary>::cast(backing_store);
int capacity = dictionary->Capacity();
Handle<FixedArray> elements = isolate->factory()->NewFixedArray(
GetMaxNumberOfEntries(*object, *backing_store));
int insertion_index = 0;
PropertyFilter filter = keys->filter();
for (int i = 0; i < capacity; i++) {
Object* raw_key = dictionary->KeyAt(i);
if (!dictionary->IsKey(isolate, raw_key)) continue;
uint32_t key = FilterKey(dictionary, i, raw_key, filter);
if (key == kMaxUInt32) {
keys->AddShadowingKey(raw_key);
continue;
}
elements->set(insertion_index, raw_key);
insertion_index++;
}
SortIndices(elements, insertion_index);
for (int i = 0; i < insertion_index; i++) {
keys->AddKey(elements->get(i));
}
}
static Handle<FixedArray> DirectCollectElementIndicesImpl(
Isolate* isolate, Handle<JSObject> object,
Handle<FixedArrayBase> backing_store, GetKeysConversion convert,
PropertyFilter filter, Handle<FixedArray> list, uint32_t* nof_indices,
uint32_t insertion_index = 0) {
if (filter & SKIP_STRINGS) return list;
if (filter & ONLY_ALL_CAN_READ) return list;
Handle<SeededNumberDictionary> dictionary =
Handle<SeededNumberDictionary>::cast(backing_store);
uint32_t capacity = dictionary->Capacity();
for (uint32_t i = 0; i < capacity; i++) {
uint32_t key = GetKeyForEntryImpl(isolate, dictionary, i, filter);
if (key == kMaxUInt32) continue;
Handle<Object> index = isolate->factory()->NewNumberFromUint(key);
list->set(insertion_index, *index);
insertion_index++;
}
*nof_indices = insertion_index;
return list;
}
static void AddElementsToKeyAccumulatorImpl(Handle<JSObject> receiver,
KeyAccumulator* accumulator,
AddKeyConversion convert) {
Isolate* isolate = accumulator->isolate();
Handle<Object> undefined = isolate->factory()->undefined_value();
Handle<Object> the_hole = isolate->factory()->the_hole_value();
Handle<SeededNumberDictionary> dictionary(
SeededNumberDictionary::cast(receiver->elements()), isolate);
int capacity = dictionary->Capacity();
for (int i = 0; i < capacity; i++) {
Object* k = dictionary->KeyAt(i);
if (k == *undefined) continue;
if (k == *the_hole) continue;
if (dictionary->IsDeleted(i)) continue;
Object* value = dictionary->ValueAt(i);
DCHECK(!value->IsTheHole(isolate));
DCHECK(!value->IsAccessorPair());
DCHECK(!value->IsAccessorInfo());
accumulator->AddKey(value, convert);
}
}
static bool IncludesValueFastPath(Isolate* isolate, Handle<JSObject> receiver,
Handle<Object> value, uint32_t start_from,
uint32_t length, Maybe<bool>* result) {
DisallowHeapAllocation no_gc;
SeededNumberDictionary* dictionary =
SeededNumberDictionary::cast(receiver->elements());
int capacity = dictionary->Capacity();
Object* the_hole = isolate->heap()->the_hole_value();
Object* undefined = isolate->heap()->undefined_value();
// Scan for accessor properties. If accessors are present, then elements
// must be accessed in order via the slow path.
bool found = false;
for (int i = 0; i < capacity; ++i) {
Object* k = dictionary->KeyAt(i);
if (k == the_hole) continue;
if (k == undefined) continue;
uint32_t index;
if (!k->ToArrayIndex(&index) || index < start_from || index >= length) {
continue;
}
if (dictionary->DetailsAt(i).kind() == kAccessor) {
// Restart from beginning in slow path, otherwise we may observably
// access getters out of order
return false;
} else if (!found) {
Object* element_k = dictionary->ValueAt(i);
if (value->SameValueZero(element_k)) found = true;
}
}
*result = Just(found);
return true;
}
static Maybe<bool> IncludesValueImpl(Isolate* isolate,
Handle<JSObject> receiver,
Handle<Object> value,
uint32_t start_from, uint32_t length) {
DCHECK(JSObject::PrototypeHasNoElements(isolate, *receiver));
bool search_for_hole = value->IsUndefined(isolate);
if (!search_for_hole) {
Maybe<bool> result = Nothing<bool>();
if (DictionaryElementsAccessor::IncludesValueFastPath(
isolate, receiver, value, start_from, length, &result)) {
return result;
}
}
Handle<SeededNumberDictionary> dictionary(
SeededNumberDictionary::cast(receiver->elements()), isolate);
// Iterate through entire range, as accessing elements out of order is
// observable
for (uint32_t k = start_from; k < length; ++k) {
int entry = dictionary->FindEntry(k);
if (entry == SeededNumberDictionary::kNotFound) {
if (search_for_hole) return Just(true);
continue;
}
PropertyDetails details = GetDetailsImpl(*dictionary, entry);
switch (details.kind()) {
case kData: {
Object* element_k = dictionary->ValueAt(entry);
if (value->SameValueZero(element_k)) return Just(true);
break;
}
case kAccessor: {
LookupIterator it(isolate, receiver, k,
LookupIterator::OWN_SKIP_INTERCEPTOR);
DCHECK(it.IsFound());
DCHECK_EQ(it.state(), LookupIterator::ACCESSOR);
Handle<Object> element_k;
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, element_k, JSObject::GetPropertyWithAccessor(&it),
Nothing<bool>());
if (value->SameValueZero(*element_k)) return Just(true);
// Bailout to slow path if elements on prototype changed
if (!JSObject::PrototypeHasNoElements(isolate, *receiver)) {
return IncludesValueSlowPath(isolate, receiver, value, k + 1,
length);
}
// Continue if elements unchanged
if (*dictionary == receiver->elements()) continue;
// Otherwise, bailout or update elements
if (receiver->GetElementsKind() != DICTIONARY_ELEMENTS) {
if (receiver->map()->GetInitialElements() == receiver->elements()) {
// If switched to initial elements, return true if searching for
// undefined, and false otherwise.
return Just(search_for_hole);
}
// Otherwise, switch to slow path.
return IncludesValueSlowPath(isolate, receiver, value, k + 1,
length);
}
dictionary = handle(
SeededNumberDictionary::cast(receiver->elements()), isolate);
break;
}
}
}
return Just(false);
}
static Maybe<int64_t> IndexOfValueImpl(Isolate* isolate,
Handle<JSObject> receiver,
Handle<Object> value,
uint32_t start_from, uint32_t length) {
DCHECK(JSObject::PrototypeHasNoElements(isolate, *receiver));
Handle<SeededNumberDictionary> dictionary(
SeededNumberDictionary::cast(receiver->elements()), isolate);
// Iterate through entire range, as accessing elements out of order is
// observable.
for (uint32_t k = start_from; k < length; ++k) {
int entry = dictionary->FindEntry(k);
if (entry == SeededNumberDictionary::kNotFound) {
continue;
}
PropertyDetails details = GetDetailsImpl(*dictionary, entry);
switch (details.kind()) {
case kData: {
Object* element_k = dictionary->ValueAt(entry);
if (value->StrictEquals(element_k)) {
return Just<int64_t>(k);
}
break;
}
case kAccessor: {
LookupIterator it(isolate, receiver, k,
LookupIterator::OWN_SKIP_INTERCEPTOR);
DCHECK(it.IsFound());
DCHECK_EQ(it.state(), LookupIterator::ACCESSOR);
Handle<Object> element_k;
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, element_k, JSObject::GetPropertyWithAccessor(&it),
Nothing<int64_t>());
if (value->StrictEquals(*element_k)) return Just<int64_t>(k);
// Bailout to slow path if elements on prototype changed.
if (!JSObject::PrototypeHasNoElements(isolate, *receiver)) {
return IndexOfValueSlowPath(isolate, receiver, value, k + 1,
length);
}
// Continue if elements unchanged.
if (*dictionary == receiver->elements()) continue;
// Otherwise, bailout or update elements.
if (receiver->GetElementsKind() != DICTIONARY_ELEMENTS) {
// Otherwise, switch to slow path.
return IndexOfValueSlowPath(isolate, receiver, value, k + 1,
length);
}
dictionary = handle(
SeededNumberDictionary::cast(receiver->elements()), isolate);
break;
}
}
}
return Just<int64_t>(-1);
}
};
// Super class for all fast element arrays.
template <typename Subclass, typename KindTraits>
class FastElementsAccessor : public ElementsAccessorBase<Subclass, KindTraits> {
public:
explicit FastElementsAccessor(const char* name)
: ElementsAccessorBase<Subclass, KindTraits>(name) {}
typedef typename KindTraits::BackingStore BackingStore;
static Handle<SeededNumberDictionary> NormalizeImpl(
Handle<JSObject> object, Handle<FixedArrayBase> store) {
Isolate* isolate = store->GetIsolate();
ElementsKind kind = Subclass::kind();
// Ensure that notifications fire if the array or object prototypes are
// normalizing.
if (IsFastSmiOrObjectElementsKind(kind)) {
isolate->UpdateArrayProtectorOnNormalizeElements(object);
}
int capacity = object->GetFastElementsUsage();
Handle<SeededNumberDictionary> dictionary =
SeededNumberDictionary::New(isolate, capacity);
PropertyDetails details = PropertyDetails::Empty();
int j = 0;
for (int i = 0; j < capacity; i++) {
if (IsHoleyElementsKind(kind)) {
if (BackingStore::cast(*store)->is_the_hole(isolate, i)) continue;
}
Handle<Object> value = Subclass::GetImpl(isolate, *store, i);
dictionary = SeededNumberDictionary::AddNumberEntry(dictionary, i, value,
details, object);
j++;
}
return dictionary;
}
static void DeleteAtEnd(Handle<JSObject> obj,
Handle<BackingStore> backing_store, uint32_t entry) {
uint32_t length = static_cast<uint32_t>(backing_store->length());
Isolate* isolate = obj->GetIsolate();
for (; entry > 0; entry--) {
if (!backing_store->is_the_hole(isolate, entry - 1)) break;
}
if (entry == 0) {
FixedArray* empty = isolate->heap()->empty_fixed_array();
// Dynamically ask for the elements kind here since we manually redirect
// the operations for argument backing stores.
if (obj->GetElementsKind() == FAST_SLOPPY_ARGUMENTS_ELEMENTS) {
FixedArray::cast(obj->elements())->set(1, empty);
} else {
obj->set_elements(empty);
}
return;
}
isolate->heap()->RightTrimFixedArray(*backing_store, length - entry);
}
static void DeleteCommon(Handle<JSObject> obj, uint32_t entry,
Handle<FixedArrayBase> store) {
DCHECK(obj->HasFastSmiOrObjectElements() || obj->HasFastDoubleElements() ||
obj->HasFastArgumentsElements() ||
obj->HasFastStringWrapperElements());
Handle<BackingStore> backing_store = Handle<BackingStore>::cast(store);
if (!obj->IsJSArray() &&
entry == static_cast<uint32_t>(store->length()) - 1) {
DeleteAtEnd(obj, backing_store, entry);
return;
}
Isolate* isolate = obj->GetIsolate();
backing_store->set_the_hole(isolate, entry);
// TODO(verwaest): Move this out of elements.cc.
// If an old space backing store is larger than a certain size and
// has too few used values, normalize it.
// To avoid doing the check on every delete we require at least
// one adjacent hole to the value being deleted.
const int kMinLengthForSparsenessCheck = 64;
if (backing_store->length() < kMinLengthForSparsenessCheck) return;
if (backing_store->GetHeap()->InNewSpace(*backing_store)) return;
uint32_t length = 0;
if (obj->IsJSArray()) {
JSArray::cast(*obj)->length()->ToArrayLength(&length);
} else {
length = static_cast<uint32_t>(store->length());
}
if ((entry > 0 && backing_store->is_the_hole(isolate, entry - 1)) ||
(entry + 1 < length &&
backing_store->is_the_hole(isolate, entry + 1))) {
if (!obj->IsJSArray()) {
uint32_t i;
for (i = entry + 1; i < length; i++) {
if (!backing_store->is_the_hole(isolate, i)) break;
}
if (i == length) {
DeleteAtEnd(obj, backing_store, entry);
return;
}
}
int num_used = 0;
for (int i = 0; i < backing_store->length(); ++i) {
if (!backing_store->is_the_hole(isolate, i)) {
++num_used;
// Bail out if a number dictionary wouldn't be able to save at least
// 75% space.
if (4 * SeededNumberDictionary::ComputeCapacity(num_used) *
SeededNumberDictionary::kEntrySize >
backing_store->length()) {
return;
}
}
}
JSObject::NormalizeElements(obj);
}
}
static void ReconfigureImpl(Handle<JSObject> object,
Handle<FixedArrayBase> store, uint32_t entry,
Handle<Object> value,
PropertyAttributes attributes) {
Handle<SeededNumberDictionary> dictionary =
JSObject::NormalizeElements(object);
entry = dictionary->FindEntry(entry);
DictionaryElementsAccessor::ReconfigureImpl(object, dictionary, entry,
value, attributes);
}
static void AddImpl(Handle<JSObject> object, uint32_t index,
Handle<Object> value, PropertyAttributes attributes,
uint32_t new_capacity) {
DCHECK_EQ(NONE, attributes);
ElementsKind from_kind = object->GetElementsKind();
ElementsKind to_kind = Subclass::kind();
if (IsDictionaryElementsKind(from_kind) ||
IsFastDoubleElementsKind(from_kind) !=
IsFastDoubleElementsKind(to_kind) ||
Subclass::GetCapacityImpl(*object, object->elements()) !=
new_capacity) {
Subclass::GrowCapacityAndConvertImpl(object, new_capacity);
} else {
if (IsFastElementsKind(from_kind) && from_kind != to_kind) {
JSObject::TransitionElementsKind(object, to_kind);
}
if (IsFastSmiOrObjectElementsKind(from_kind)) {
DCHECK(IsFastSmiOrObjectElementsKind(to_kind));
JSObject::EnsureWritableFastElements(object);
}
}
Subclass::SetImpl(object, index, *value);
}
static void DeleteImpl(Handle<JSObject> obj, uint32_t entry) {
ElementsKind kind = KindTraits::Kind;
if (IsFastPackedElementsKind(kind)) {
JSObject::TransitionElementsKind(obj, GetHoleyElementsKind(kind));
}
if (IsFastSmiOrObjectElementsKind(KindTraits::Kind)) {
JSObject::EnsureWritableFastElements(obj);
}
DeleteCommon(obj, entry, handle(obj->elements()));
}
static bool HasEntryImpl(Isolate* isolate, FixedArrayBase* backing_store,
uint32_t entry) {
return !BackingStore::cast(backing_store)->is_the_hole(isolate, entry);
}
static uint32_t NumberOfElementsImpl(JSObject* receiver,
FixedArrayBase* backing_store) {
uint32_t max_index = Subclass::GetMaxIndex(receiver, backing_store);
if (IsFastPackedElementsKind(Subclass::kind())) return max_index;
Isolate* isolate = receiver->GetIsolate();
uint32_t count = 0;
for (uint32_t i = 0; i < max_index; i++) {
if (Subclass::HasEntryImpl(isolate, backing_store, i)) count++;
}
return count;
}
static void AddElementsToKeyAccumulatorImpl(Handle<JSObject> receiver,
KeyAccumulator* accumulator,
AddKeyConversion convert) {
Isolate* isolate = accumulator->isolate();
Handle<FixedArrayBase> elements(receiver->elements(), isolate);
uint32_t length = Subclass::GetMaxNumberOfEntries(*receiver, *elements);
for (uint32_t i = 0; i < length; i++) {
if (IsFastPackedElementsKind(KindTraits::Kind) ||
HasEntryImpl(isolate, *elements, i)) {
accumulator->AddKey(Subclass::GetImpl(isolate, *elements, i), convert);
}
}
}
static void ValidateContents(Handle<JSObject> holder, int length) {
#if DEBUG
Isolate* isolate = holder->GetIsolate();
Heap* heap = isolate->heap();
HandleScope scope(isolate);
Handle<FixedArrayBase> elements(holder->elements(), isolate);
Map* map = elements->map();
if (IsFastSmiOrObjectElementsKind(KindTraits::Kind)) {
DCHECK_NE(map, heap->fixed_double_array_map());
} else if (IsFastDoubleElementsKind(KindTraits::Kind)) {
DCHECK_NE(map, heap->fixed_cow_array_map());
if (map == heap->fixed_array_map()) DCHECK_EQ(0, length);
} else {
UNREACHABLE();
}
if (length == 0) return; // nothing to do!
#if ENABLE_SLOW_DCHECKS
DisallowHeapAllocation no_gc;
Handle<BackingStore> backing_store = Handle<BackingStore>::cast(elements);
if (IsFastSmiElementsKind(KindTraits::Kind)) {
for (int i = 0; i < length; i++) {
DCHECK(BackingStore::get(*backing_store, i, isolate)->IsSmi() ||
(IsFastHoleyElementsKind(KindTraits::Kind) &&
backing_store->is_the_hole(isolate, i)));
}
} else if (KindTraits::Kind == FAST_ELEMENTS ||
KindTraits::Kind == FAST_DOUBLE_ELEMENTS) {
for (int i = 0; i < length; i++) {
DCHECK(!backing_store->is_the_hole(isolate, i));
}
} else {
DCHECK(IsFastHoleyElementsKind(KindTraits::Kind));
}
#endif
#endif
}
static Handle<Object> PopImpl(Handle<JSArray> receiver) {
return Subclass::RemoveElement(receiver, AT_END);
}
static Handle<Object> ShiftImpl(Handle<JSArray> receiver) {
return Subclass::RemoveElement(receiver, AT_START);
}
static uint32_t PushImpl(Handle<JSArray> receiver,
Arguments* args, uint32_t push_size) {
Handle<FixedArrayBase> backing_store(receiver->elements());
return Subclass::AddArguments(receiver, backing_store, args, push_size,
AT_END);
}
static uint32_t UnshiftImpl(Handle<JSArray> receiver,
Arguments* args, uint32_t unshift_size) {
Handle<FixedArrayBase> backing_store(receiver->elements());
return Subclass::AddArguments(receiver, backing_store, args, unshift_size,
AT_START);
}
static Handle<JSArray> SliceImpl(Handle<JSObject> receiver,
uint32_t start, uint32_t end) {
Isolate* isolate = receiver->GetIsolate();
Handle<FixedArrayBase> backing_store(receiver->elements(), isolate);
int result_len = end < start ? 0u : end - start;
Handle<JSArray> result_array = isolate->factory()->NewJSArray(
KindTraits::Kind, result_len, result_len);
DisallowHeapAllocation no_gc;
Subclass::CopyElementsImpl(*backing_store, start, result_array->elements(),
KindTraits::Kind, 0, kPackedSizeNotKnown,
result_len);
Subclass::TryTransitionResultArrayToPacked(result_array);
return result_array;
}
static Handle<JSArray> SpliceImpl(Handle<JSArray> receiver,
uint32_t start, uint32_t delete_count,
Arguments* args, uint32_t add_count) {
Isolate* isolate = receiver->GetIsolate();
Heap* heap = isolate->heap();
uint32_t length = Smi::cast(receiver->length())->value();
uint32_t new_length = length - delete_count + add_count;
ElementsKind kind = KindTraits::Kind;
if (new_length <= static_cast<uint32_t>(receiver->elements()->length()) &&
IsFastSmiOrObjectElementsKind(kind)) {
HandleScope scope(isolate);
JSObject::EnsureWritableFastElements(receiver);
}
Handle<FixedArrayBase> backing_store(receiver->elements(), isolate);
if (new_length == 0) {
receiver->set_elements(heap->empty_fixed_array());
receiver->set_length(Smi::kZero);
return isolate->factory()->NewJSArrayWithElements(
backing_store, KindTraits::Kind, delete_count);
}
// Construct the result array which holds the deleted elements.
Handle<JSArray> deleted_elements = isolate->factory()->NewJSArray(
KindTraits::Kind, delete_count, delete_count);
if (delete_count > 0) {
DisallowHeapAllocation no_gc;
Subclass::CopyElementsImpl(*backing_store, start,
deleted_elements->elements(), KindTraits::Kind,
0, kPackedSizeNotKnown, delete_count);
}
// Delete and move elements to make space for add_count new elements.
if (add_count < delete_count) {
Subclass::SpliceShrinkStep(isolate, receiver, backing_store, start,
delete_count, add_count, length, new_length);
} else if (add_count > delete_count) {
backing_store =
Subclass::SpliceGrowStep(isolate, receiver, backing_store, start,
delete_count, add_count, length, new_length);
}
// Copy over the arguments.
Subclass::CopyArguments(args, backing_store, add_count, 3, start);
receiver->set_length(Smi::FromInt(new_length));
Subclass::TryTransitionResultArrayToPacked(deleted_elements);
return deleted_elements;
}
static Maybe<bool> CollectValuesOrEntriesImpl(
Isolate* isolate, Handle<JSObject> object,
Handle<FixedArray> values_or_entries, bool get_entries, int* nof_items,
PropertyFilter filter) {
Handle<BackingStore> elements(BackingStore::cast(object->elements()),
isolate);
int count = 0;
uint32_t length = elements->length();
for (uint32_t index = 0; index < length; ++index) {
if (!HasEntryImpl(isolate, *elements, index)) continue;
Handle<Object> value = Subclass::GetImpl(isolate, *elements, index);
if (get_entries) {
value = MakeEntryPair(isolate, index, value);
}
values_or_entries->set(count++, *value);
}
*nof_items = count;
return Just(true);
}
static void MoveElements(Isolate* isolate, Handle<JSArray> receiver,
Handle<FixedArrayBase> backing_store, int dst_index,
int src_index, int len, int hole_start,
int hole_end) {
Heap* heap = isolate->heap();
Handle<BackingStore> dst_elms = Handle<BackingStore>::cast(backing_store);
if (heap->CanMoveObjectStart(*dst_elms) && dst_index == 0) {
// Update all the copies of this backing_store handle.
*dst_elms.location() =
BackingStore::cast(heap->LeftTrimFixedArray(*dst_elms, src_index));
receiver->set_elements(*dst_elms);
// Adjust the hole offset as the array has been shrunk.
hole_end -= src_index;
DCHECK_LE(hole_start, backing_store->length());
DCHECK_LE(hole_end, backing_store->length());
} else if (len != 0) {
if (IsFastDoubleElementsKind(KindTraits::Kind)) {
MemMove(dst_elms->data_start() + dst_index,
dst_elms->data_start() + src_index, len * kDoubleSize);
} else {
DisallowHeapAllocation no_gc;
heap->MoveElements(FixedArray::cast(*dst_elms), dst_index, src_index,
len);
}
}
if (hole_start != hole_end) {
dst_elms->FillWithHoles(hole_start, hole_end);
}
}
static Maybe<bool> IncludesValueImpl(Isolate* isolate,
Handle<JSObject> receiver,
Handle<Object> search_value,
uint32_t start_from, uint32_t length) {
DCHECK(JSObject::PrototypeHasNoElements(isolate, *receiver));
DisallowHeapAllocation no_gc;
FixedArrayBase* elements_base = receiver->elements();
Object* the_hole = isolate->heap()->the_hole_value();
Object* undefined = isolate->heap()->undefined_value();
Object* value = *search_value;
// Elements beyond the capacity of the backing store treated as undefined.
if (value == undefined &&
static_cast<uint32_t>(elements_base->length()) < length) {
return Just(true);
}
if (start_from >= length) return Just(false);
length = std::min(static_cast<uint32_t>(elements_base->length()), length);
if (!value->IsNumber()) {
if (value == undefined) {
// Only FAST_ELEMENTS, FAST_HOLEY_ELEMENTS, FAST_HOLEY_SMI_ELEMENTS, and
// FAST_HOLEY_DOUBLE_ELEMENTS can have `undefined` as a value.
if (!IsFastObjectElementsKind(Subclass::kind()) &&
!IsFastHoleyElementsKind(Subclass::kind())) {
return Just(false);
}
// Search for `undefined` or The Hole in FAST_ELEMENTS,
// FAST_HOLEY_ELEMENTS or FAST_HOLEY_SMI_ELEMENTS
if (IsFastSmiOrObjectElementsKind(Subclass::kind())) {
auto elements = FixedArray::cast(receiver->elements());
for (uint32_t k = start_from; k < length; ++k) {
Object* element_k = elements->get(k);
if (IsFastHoleyElementsKind(Subclass::kind()) &&
element_k == the_hole) {
return Just(true);
}
if (IsFastObjectElementsKind(Subclass::kind()) &&
element_k == undefined) {
return Just(true);
}
}
return Just(false);
} else {
// Seach for The Hole in FAST_HOLEY_DOUBLE_ELEMENTS
DCHECK_EQ(Subclass::kind(), FAST_HOLEY_DOUBLE_ELEMENTS);
auto elements = FixedDoubleArray::cast(receiver->elements());
for (uint32_t k = start_from; k < length; ++k) {
if (IsFastHoleyElementsKind(Subclass::kind()) &&
elements->is_the_hole(k)) {
return Just(true);
}
}
return Just(false);
}
} else if (!IsFastObjectElementsKind(Subclass::kind())) {
// Search for non-number, non-Undefined value, with either
// FAST_SMI_ELEMENTS, FAST_DOUBLE_ELEMENTS, FAST_HOLEY_SMI_ELEMENTS or
// FAST_HOLEY_DOUBLE_ELEMENTS. Guaranteed to return false, since these
// elements kinds can only contain Number values or undefined.
return Just(false);
} else {
// Search for non-number, non-Undefined value with either
// FAST_ELEMENTS or FAST_HOLEY_ELEMENTS.
DCHECK(IsFastObjectElementsKind(Subclass::kind()));
auto elements = FixedArray::cast(receiver->elements());
for (uint32_t k = start_from; k < length; ++k) {
Object* element_k = elements->get(k);
if (IsFastHoleyElementsKind(Subclass::kind()) &&
element_k == the_hole) {
continue;
}
if (value->SameValueZero(element_k)) return Just(true);
}
return Just(false);
}
} else {
if (!value->IsNaN()) {
double search_value = value->Number();
if (IsFastDoubleElementsKind(Subclass::kind())) {
// Search for non-NaN Number in FAST_DOUBLE_ELEMENTS or
// FAST_HOLEY_DOUBLE_ELEMENTS --- Skip TheHole, and trust UCOMISD or
// similar operation for result.
auto elements = FixedDoubleArray::cast(receiver->elements());
for (uint32_t k = start_from; k < length; ++k) {
if (IsFastHoleyElementsKind(Subclass::kind()) &&
elements->is_the_hole(k)) {
continue;
}
if (elements->get_scalar(k) == search_value) return Just(true);
}
return Just(false);
} else {
// Search for non-NaN Number in FAST_ELEMENTS, FAST_HOLEY_ELEMENTS,
// FAST_SMI_ELEMENTS or FAST_HOLEY_SMI_ELEMENTS --- Skip non-Numbers,
// and trust UCOMISD or similar operation for result
auto elements = FixedArray::cast(receiver->elements());
for (uint32_t k = start_from; k < length; ++k) {
Object* element_k = elements->get(k);
if (element_k->IsNumber() && element_k->Number() == search_value) {
return Just(true);
}
}
return Just(false);
}
} else {
// Search for NaN --- NaN cannot be represented with Smi elements, so
// abort if ElementsKind is FAST_SMI_ELEMENTS or FAST_HOLEY_SMI_ELEMENTS
if (IsFastSmiElementsKind(Subclass::kind())) return Just(false);
if (IsFastDoubleElementsKind(Subclass::kind())) {
// Search for NaN in FAST_DOUBLE_ELEMENTS or
// FAST_HOLEY_DOUBLE_ELEMENTS --- Skip The Hole and trust
// std::isnan(elementK) for result
auto elements = FixedDoubleArray::cast(receiver->elements());
for (uint32_t k = start_from; k < length; ++k) {
if (IsFastHoleyElementsKind(Subclass::kind()) &&
elements->is_the_hole(k)) {
continue;
}
if (std::isnan(elements->get_scalar(k))) return Just(true);
}
return Just(false);
} else {
// Search for NaN in FAST_ELEMENTS, FAST_HOLEY_ELEMENTS,
// FAST_SMI_ELEMENTS or FAST_HOLEY_SMI_ELEMENTS. Return true if
// elementK->IsHeapNumber() && std::isnan(elementK->Number())
DCHECK(IsFastSmiOrObjectElementsKind(Subclass::kind()));
auto elements = FixedArray::cast(receiver->elements());
for (uint32_t k = start_from; k < length; ++k) {
if (elements->get(k)->IsNaN()) return Just(true);
}
return Just(false);
}
}
}
}
static Handle<FixedArray> CreateListFromArrayImpl(Isolate* isolate,
Handle<JSArray> array) {
uint32_t length = 0;
array->length()->ToArrayLength(&length);
Handle<FixedArray> result = isolate->factory()->NewFixedArray(length);
Handle<FixedArrayBase> elements(array->elements(), isolate);
for (uint32_t i = 0; i < length; i++) {
if (!Subclass::HasElementImpl(isolate, array, i, elements)) continue;
Handle<Object> value;
value = Subclass::GetImpl(isolate, *elements, i);
if (value->IsName()) {
value = isolate->factory()->InternalizeName(Handle<Name>::cast(value));
}
result->set(i, *value);
}
return result;
}
private:
// SpliceShrinkStep might modify the backing_store.
static void SpliceShrinkStep(Isolate* isolate, Handle<JSArray> receiver,
Handle<FixedArrayBase> backing_store,
uint32_t start, uint32_t delete_count,
uint32_t add_count, uint32_t len,
uint32_t new_length) {
const int move_left_count = len - delete_count - start;
const int move_left_dst_index = start + add_count;
Subclass::MoveElements(isolate, receiver, backing_store,
move_left_dst_index, start + delete_count,
move_left_count, new_length, len);
}
// SpliceGrowStep might modify the backing_store.
static Handle<FixedArrayBase> SpliceGrowStep(
Isolate* isolate, Handle<JSArray> receiver,
Handle<FixedArrayBase> backing_store, uint32_t start,
uint32_t delete_count, uint32_t add_count, uint32_t length,
uint32_t new_length) {
// Check we do not overflow the new_length.
DCHECK((add_count - delete_count) <= (Smi::kMaxValue - length));
// Check if backing_store is big enough.
if (new_length <= static_cast<uint32_t>(backing_store->length())) {
Subclass::MoveElements(isolate, receiver, backing_store,
start + add_count, start + delete_count,
(length - delete_count - start), 0, 0);
// MoveElements updates the backing_store in-place.
return backing_store;
}
// New backing storage is needed.
int capacity = JSObject::NewElementsCapacity(new_length);
// Partially copy all elements up to start.
Handle<FixedArrayBase> new_elms = Subclass::ConvertElementsWithCapacity(
receiver, backing_store, KindTraits::Kind, capacity, start);
// Copy the trailing elements after start + delete_count
Subclass::CopyElementsImpl(*backing_store, start + delete_count, *new_elms,
KindTraits::Kind, start + add_count,
kPackedSizeNotKnown,
ElementsAccessor::kCopyToEndAndInitializeToHole);
receiver->set_elements(*new_elms);
return new_elms;
}
static Handle<Object> RemoveElement(Handle<JSArray> receiver,
Where remove_position) {
Isolate* isolate = receiver->GetIsolate();
ElementsKind kind = KindTraits::Kind;
if (IsFastSmiOrObjectElementsKind(kind)) {
HandleScope scope(isolate);
JSObject::EnsureWritableFastElements(receiver);
}
Handle<FixedArrayBase> backing_store(receiver->elements(), isolate);
uint32_t length =
static_cast<uint32_t>(Smi::cast(receiver->length())->value());
DCHECK(length > 0);
int new_length = length - 1;
int remove_index = remove_position == AT_START ? 0 : new_length;
Handle<Object> result =
Subclass::GetImpl(isolate, *backing_store, remove_index);
if (remove_position == AT_START) {
Subclass::MoveElements(isolate, receiver, backing_store, 0, 1, new_length,
0, 0);
}
Subclass::SetLengthImpl(isolate, receiver, new_length, backing_store);
if (IsHoleyElementsKind(kind) && result->IsTheHole(isolate)) {
return isolate->factory()->undefined_value();
}
return result;
}
static uint32_t AddArguments(Handle<JSArray> receiver,
Handle<FixedArrayBase> backing_store,
Arguments* args, uint32_t add_size,
Where add_position) {
uint32_t length = Smi::cast(receiver->length())->value();
DCHECK(0 < add_size);
uint32_t elms_len = backing_store->length();
// Check we do not overflow the new_length.
DCHECK(add_size <= static_cast<uint32_t>(Smi::kMaxValue - length));
uint32_t new_length = length + add_size;
if (new_length > elms_len) {
// New backing storage is needed.
uint32_t capacity = JSObject::NewElementsCapacity(new_length);
// If we add arguments to the start we have to shift the existing objects.
int copy_dst_index = add_position == AT_START ? add_size : 0;
// Copy over all objects to a new backing_store.
backing_store = Subclass::ConvertElementsWithCapacity(
receiver, backing_store, KindTraits::Kind, capacity, 0,
copy_dst_index, ElementsAccessor::kCopyToEndAndInitializeToHole);
receiver->set_elements(*backing_store);
} else if (add_position == AT_START) {
// If the backing store has enough capacity and we add elements to the
// start we have to shift the existing objects.
Isolate* isolate = receiver->GetIsolate();
Subclass::MoveElements(isolate, receiver, backing_store, add_size, 0,
length, 0, 0);
}
int insertion_index = add_position == AT_START ? 0 : length;
// Copy the arguments to the start.
Subclass::CopyArguments(args, backing_store, add_size, 1, insertion_index);
// Set the length.
receiver->set_length(Smi::FromInt(new_length));
return new_length;
}
static void CopyArguments(Arguments* args, Handle<FixedArrayBase> dst_store,
uint32_t copy_size, uint32_t src_index,
uint32_t dst_index) {
// Add the provided values.
DisallowHeapAllocation no_gc;
FixedArrayBase* raw_backing_store = *dst_store;
WriteBarrierMode mode = raw_backing_store->GetWriteBarrierMode(no_gc);
for (uint32_t i = 0; i < copy_size; i++) {
Object* argument = (*args)[src_index + i];
DCHECK(!argument->IsTheHole(raw_backing_store->GetIsolate()));
Subclass::SetImpl(raw_backing_store, dst_index + i, argument, mode);
}
}
};
template <typename Subclass, typename KindTraits>
class FastSmiOrObjectElementsAccessor
: public FastElementsAccessor<Subclass, KindTraits> {
public:
explicit FastSmiOrObjectElementsAccessor(const char* name)
: FastElementsAccessor<Subclass, KindTraits>(name) {}
static inline void SetImpl(Handle<JSObject> holder, uint32_t entry,
Object* value) {
SetImpl(holder->elements(), entry, value);
}
static inline void SetImpl(FixedArrayBase* backing_store, uint32_t entry,
Object* value) {
FixedArray::cast(backing_store)->set(entry, value);
}
static inline void SetImpl(FixedArrayBase* backing_store, uint32_t entry,
Object* value, WriteBarrierMode mode) {
FixedArray::cast(backing_store)->set(entry, value, mode);
}
static Object* GetRaw(FixedArray* backing_store, uint32_t entry) {
uint32_t index = Subclass::GetIndexForEntryImpl(backing_store, entry);
return backing_store->get(index);
}
// NOTE: this method violates the handlified function signature convention:
// raw pointer parameters in the function that allocates.
// See ElementsAccessor::CopyElements() for details.
// This method could actually allocate if copying from double elements to
// object elements.
static void CopyElementsImpl(FixedArrayBase* from, uint32_t from_start,
FixedArrayBase* to, ElementsKind from_kind,
uint32_t to_start, int packed_size,
int copy_size) {
DisallowHeapAllocation no_gc;
ElementsKind to_kind = KindTraits::Kind;
switch (from_kind) {
case FAST_SMI_ELEMENTS:
case FAST_HOLEY_SMI_ELEMENTS:
case FAST_ELEMENTS:
case FAST_HOLEY_ELEMENTS:
CopyObjectToObjectElements(from, from_kind, from_start, to, to_kind,
to_start, copy_size);
break;
case FAST_DOUBLE_ELEMENTS:
case FAST_HOLEY_DOUBLE_ELEMENTS: {
AllowHeapAllocation allow_allocation;
DCHECK(IsFastObjectElementsKind(to_kind));
CopyDoubleToObjectElements(from, from_start, to, to_start, copy_size);
break;
}
case DICTIONARY_ELEMENTS:
CopyDictionaryToObjectElements(from, from_start, to, to_kind, to_start,
copy_size);
break;
case FAST_SLOPPY_ARGUMENTS_ELEMENTS:
case SLOW_SLOPPY_ARGUMENTS_ELEMENTS:
case FAST_STRING_WRAPPER_ELEMENTS:
case SLOW_STRING_WRAPPER_ELEMENTS:
#define TYPED_ARRAY_CASE(Type, type, TYPE, ctype, size) case TYPE##_ELEMENTS:
TYPED_ARRAYS(TYPED_ARRAY_CASE)
#undef TYPED_ARRAY_CASE
// This function is currently only used for JSArrays with non-zero
// length.
UNREACHABLE();
break;
case NO_ELEMENTS:
break; // Nothing to do.
}
}
static Maybe<int64_t> IndexOfValueImpl(Isolate* isolate,
Handle<JSObject> receiver,
Handle<Object> search_value,
uint32_t start_from, uint32_t length) {
DCHECK(JSObject::PrototypeHasNoElements(isolate, *receiver));
DisallowHeapAllocation no_gc;
FixedArrayBase* elements_base = receiver->elements();
Object* value = *search_value;
if (start_from >= length) return Just<int64_t>(-1);
length = std::min(static_cast<uint32_t>(elements_base->length()), length);
// Only FAST_{,HOLEY_}ELEMENTS can store non-numbers.
if (!value->IsNumber() && !IsFastObjectElementsKind(Subclass::kind())) {
return Just<int64_t>(-1);
}
// NaN can never be found by strict equality.
if (value->IsNaN()) return Just<int64_t>(-1);
FixedArray* elements = FixedArray::cast(receiver->elements());
for (uint32_t k = start_from; k < length; ++k) {
if (value->StrictEquals(elements->get(k))) return Just<int64_t>(k);
}
return Just<int64_t>(-1);
}
};
class FastPackedSmiElementsAccessor
: public FastSmiOrObjectElementsAccessor<
FastPackedSmiElementsAccessor,
ElementsKindTraits<FAST_SMI_ELEMENTS> > {
public:
explicit FastPackedSmiElementsAccessor(const char* name)
: FastSmiOrObjectElementsAccessor<
FastPackedSmiElementsAccessor,
ElementsKindTraits<FAST_SMI_ELEMENTS> >(name) {}
};
class FastHoleySmiElementsAccessor
: public FastSmiOrObjectElementsAccessor<
FastHoleySmiElementsAccessor,
ElementsKindTraits<FAST_HOLEY_SMI_ELEMENTS> > {
public:
explicit FastHoleySmiElementsAccessor(const char* name)
: FastSmiOrObjectElementsAccessor<
FastHoleySmiElementsAccessor,
ElementsKindTraits<FAST_HOLEY_SMI_ELEMENTS> >(name) {}
};
class FastPackedObjectElementsAccessor
: public FastSmiOrObjectElementsAccessor<
FastPackedObjectElementsAccessor,
ElementsKindTraits<FAST_ELEMENTS> > {
public:
explicit FastPackedObjectElementsAccessor(const char* name)
: FastSmiOrObjectElementsAccessor<
FastPackedObjectElementsAccessor,
ElementsKindTraits<FAST_ELEMENTS> >(name) {}
};
class FastHoleyObjectElementsAccessor
: public FastSmiOrObjectElementsAccessor<
FastHoleyObjectElementsAccessor,
ElementsKindTraits<FAST_HOLEY_ELEMENTS> > {
public:
explicit FastHoleyObjectElementsAccessor(const char* name)
: FastSmiOrObjectElementsAccessor<
FastHoleyObjectElementsAccessor,
ElementsKindTraits<FAST_HOLEY_ELEMENTS> >(name) {}
};
template <typename Subclass, typename KindTraits>
class FastDoubleElementsAccessor
: public FastElementsAccessor<Subclass, KindTraits> {
public:
explicit FastDoubleElementsAccessor(const char* name)
: FastElementsAccessor<Subclass, KindTraits>(name) {}
static Handle<Object> GetImpl(Isolate* isolate, FixedArrayBase* backing_store,
uint32_t entry) {
return FixedDoubleArray::get(FixedDoubleArray::cast(backing_store), entry,
isolate);
}
static inline void SetImpl(Handle<JSObject> holder, uint32_t entry,
Object* value) {
SetImpl(holder->elements(), entry, value);
}
static inline void SetImpl(FixedArrayBase* backing_store, uint32_t entry,
Object* value) {
FixedDoubleArray::cast(backing_store)->set(entry, value->Number());
}
static inline void SetImpl(FixedArrayBase* backing_store, uint32_t entry,
Object* value, WriteBarrierMode mode) {
FixedDoubleArray::cast(backing_store)->set(entry, value->Number());
}
static void CopyElementsImpl(FixedArrayBase* from, uint32_t from_start,
FixedArrayBase* to, ElementsKind from_kind,
uint32_t to_start, int packed_size,
int copy_size) {
DisallowHeapAllocation no_allocation;
switch (from_kind) {
case FAST_SMI_ELEMENTS:
CopyPackedSmiToDoubleElements(from, from_start, to, to_start,
packed_size, copy_size);
break;
case FAST_HOLEY_SMI_ELEMENTS:
CopySmiToDoubleElements(from, from_start, to, to_start, copy_size);
break;
case FAST_DOUBLE_ELEMENTS:
case FAST_HOLEY_DOUBLE_ELEMENTS:
CopyDoubleToDoubleElements(from, from_start, to, to_start, copy_size);
break;
case FAST_ELEMENTS:
case FAST_HOLEY_ELEMENTS:
CopyObjectToDoubleElements(from, from_start, to, to_start, copy_size);
break;
case DICTIONARY_ELEMENTS:
CopyDictionaryToDoubleElements(from, from_start, to, to_start,
copy_size);
break;
case FAST_SLOPPY_ARGUMENTS_ELEMENTS:
case SLOW_SLOPPY_ARGUMENTS_ELEMENTS:
case FAST_STRING_WRAPPER_ELEMENTS:
case SLOW_STRING_WRAPPER_ELEMENTS:
case NO_ELEMENTS:
#define TYPED_ARRAY_CASE(Type, type, TYPE, ctype, size) case TYPE##_ELEMENTS:
TYPED_ARRAYS(TYPED_ARRAY_CASE)
#undef TYPED_ARRAY_CASE
// This function is currently only used for JSArrays with non-zero
// length.
UNREACHABLE();
break;
}
}
static Maybe<int64_t> IndexOfValueImpl(Isolate* isolate,
Handle<JSObject> receiver,
Handle<Object> search_value,
uint32_t start_from, uint32_t length) {
DCHECK(JSObject::PrototypeHasNoElements(isolate, *receiver));
DisallowHeapAllocation no_gc;
FixedArrayBase* elements_base = receiver->elements();
Object* value = *search_value;
if (start_from >= length) return Just<int64_t>(-1);
length = std::min(static_cast<uint32_t>(elements_base->length()), length);
if (!value->IsNumber()) {
return Just<int64_t>(-1);
}
if (value->IsNaN()) {
return Just<int64_t>(-1);
}
double numeric_search_value = value->Number();
FixedDoubleArray* elements = FixedDoubleArray::cast(receiver->elements());
for (uint32_t k = start_from; k < length; ++k) {
if (elements->is_the_hole(k)) {
continue;
}
if (elements->get_scalar(k) == numeric_search_value) {
return Just<int64_t>(k);
}
}
return Just<int64_t>(-1);
}
};
class FastPackedDoubleElementsAccessor
: public FastDoubleElementsAccessor<
FastPackedDoubleElementsAccessor,
ElementsKindTraits<FAST_DOUBLE_ELEMENTS> > {
public:
explicit FastPackedDoubleElementsAccessor(const char* name)
: FastDoubleElementsAccessor<
FastPackedDoubleElementsAccessor,
ElementsKindTraits<FAST_DOUBLE_ELEMENTS> >(name) {}
};
class FastHoleyDoubleElementsAccessor
: public FastDoubleElementsAccessor<
FastHoleyDoubleElementsAccessor,
ElementsKindTraits<FAST_HOLEY_DOUBLE_ELEMENTS> > {
public:
explicit FastHoleyDoubleElementsAccessor(const char* name)
: FastDoubleElementsAccessor<
FastHoleyDoubleElementsAccessor,
ElementsKindTraits<FAST_HOLEY_DOUBLE_ELEMENTS> >(name) {}
};
// Super class for all external element arrays.
template <ElementsKind Kind, typename ctype>
class TypedElementsAccessor
: public ElementsAccessorBase<TypedElementsAccessor<Kind, ctype>,
ElementsKindTraits<Kind>> {
public:
explicit TypedElementsAccessor(const char* name)
: ElementsAccessorBase<AccessorClass,
ElementsKindTraits<Kind> >(name) {}
typedef typename ElementsKindTraits<Kind>::BackingStore BackingStore;
typedef TypedElementsAccessor<Kind, ctype> AccessorClass;
static inline void SetImpl(Handle<JSObject> holder, uint32_t entry,
Object* value) {
SetImpl(holder->elements(), entry, value);
}
static inline void SetImpl(FixedArrayBase* backing_store, uint32_t entry,
Object* value) {
BackingStore::cast(backing_store)->SetValue(entry, value);
}
static inline void SetImpl(FixedArrayBase* backing_store, uint32_t entry,
Object* value, WriteBarrierMode mode) {
BackingStore::cast(backing_store)->SetValue(entry, value);
}
static Handle<Object> GetImpl(Isolate* isolate, FixedArrayBase* backing_store,
uint32_t entry) {
return BackingStore::get(BackingStore::cast(backing_store), entry);
}
static PropertyDetails GetDetailsImpl(JSObject* holder, uint32_t entry) {
return PropertyDetails(DONT_DELETE, DATA, 0, PropertyCellType::kNoCell);
}
static PropertyDetails GetDetailsImpl(FixedArrayBase* backing_store,
uint32_t entry) {
return PropertyDetails(DONT_DELETE, DATA, 0, PropertyCellType::kNoCell);
}
static bool HasElementImpl(Isolate* isolate, Handle<JSObject> holder,
uint32_t index,
Handle<FixedArrayBase> backing_store,
PropertyFilter filter) {
return index < AccessorClass::GetCapacityImpl(*holder, *backing_store);
}
static bool HasAccessorsImpl(JSObject* holder,
FixedArrayBase* backing_store) {
return false;
}
static void SetLengthImpl(Isolate* isolate, Handle<JSArray> array,
uint32_t length,
Handle<FixedArrayBase> backing_store) {
// External arrays do not support changing their length.
UNREACHABLE();
}
static void DeleteImpl(Handle<JSObject> obj, uint32_t entry) {
UNREACHABLE();
}
static uint32_t GetIndexForEntryImpl(FixedArrayBase* backing_store,
uint32_t entry) {
return entry;
}
static uint32_t GetEntryForIndexImpl(Isolate* isolate, JSObject* holder,
FixedArrayBase* backing_store,
uint32_t index, PropertyFilter filter) {
return index < AccessorClass::GetCapacityImpl(holder, backing_store)
? index
: kMaxUInt32;
}
static uint32_t GetCapacityImpl(JSObject* holder,
FixedArrayBase* backing_store) {
JSArrayBufferView* view = JSArrayBufferView::cast(holder);
if (view->WasNeutered()) return 0;
return backing_store->length();
}
static uint32_t NumberOfElementsImpl(JSObject* receiver,
FixedArrayBase* backing_store) {
return AccessorClass::GetCapacityImpl(receiver, backing_store);
}
static void AddElementsToKeyAccumulatorImpl(Handle<JSObject> receiver,
KeyAccumulator* accumulator,
AddKeyConversion convert) {
Isolate* isolate = receiver->GetIsolate();
Handle<FixedArrayBase> elements(receiver->elements());
uint32_t length = AccessorClass::GetCapacityImpl(*receiver, *elements);
for (uint32_t i = 0; i < length; i++) {
Handle<Object> value = AccessorClass::GetImpl(isolate, *elements, i);
accumulator->AddKey(value, convert);
}
}
static Maybe<bool> CollectValuesOrEntriesImpl(
Isolate* isolate, Handle<JSObject> object,
Handle<FixedArray> values_or_entries, bool get_entries, int* nof_items,
PropertyFilter filter) {
int count = 0;
if ((filter & ONLY_CONFIGURABLE) == 0) {
Handle<FixedArrayBase> elements(object->elements());
uint32_t length = AccessorClass::GetCapacityImpl(*object, *elements);
for (uint32_t index = 0; index < length; ++index) {
Handle<Object> value =
AccessorClass::GetImpl(isolate, *elements, index);
if (get_entries) {
value = MakeEntryPair(isolate, index, value);
}
values_or_entries->set(count++, *value);
}
}
*nof_items = count;
return Just(true);
}
static Maybe<bool> IncludesValueImpl(Isolate* isolate,
Handle<JSObject> receiver,
Handle<Object> value,
uint32_t start_from, uint32_t length) {
DCHECK(JSObject::PrototypeHasNoElements(isolate, *receiver));
DisallowHeapAllocation no_gc;
BackingStore* elements = BackingStore::cast(receiver->elements());
if (value->IsUndefined(isolate) &&
length > static_cast<uint32_t>(elements->length())) {
return Just(true);
}
if (!value->IsNumber()) return Just(false);
double search_value = value->Number();
if (!std::isfinite(search_value)) {
// Integral types cannot represent +Inf or NaN
if (AccessorClass::kind() < FLOAT32_ELEMENTS ||
AccessorClass::kind() > FLOAT64_ELEMENTS) {
return Just(false);
}
} else if (search_value < std::numeric_limits<ctype>::lowest() ||
search_value > std::numeric_limits<ctype>::max()) {
// Return false if value can't be represented in this space
return Just(false);
}
// Prototype has no elements, and not searching for the hole --- limit
// search to backing store length.
if (static_cast<uint32_t>(elements->length()) < length) {
length = elements->length();
}
if (!std::isnan(search_value)) {
for (uint32_t k = start_from; k < length; ++k) {
double element_k = elements->get_scalar(k);
if (element_k == search_value) return Just(true);
}
return Just(false);
} else {
for (uint32_t k = start_from; k < length; ++k) {
double element_k = elements->get_scalar(k);
if (std::isnan(element_k)) return Just(true);
}
return Just(false);
}
}
static Maybe<int64_t> IndexOfValueImpl(Isolate* isolate,
Handle<JSObject> receiver,
Handle<Object> value,
uint32_t start_from, uint32_t length) {
DCHECK(JSObject::PrototypeHasNoElements(isolate, *receiver));
DisallowHeapAllocation no_gc;
BackingStore* elements = BackingStore::cast(receiver->elements());
if (!value->IsNumber()) return Just<int64_t>(-1);
double search_value = value->Number();
if (!std::isfinite(search_value)) {
// Integral types cannot represent +Inf or NaN.
if (AccessorClass::kind() < FLOAT32_ELEMENTS ||
AccessorClass::kind() > FLOAT64_ELEMENTS) {
return Just<int64_t>(-1);
}
} else if (search_value < std::numeric_limits<ctype>::lowest() ||
search_value > std::numeric_limits<ctype>::max()) {
// Return false if value can't be represented in this ElementsKind.
return Just<int64_t>(-1);
}
// Prototype has no elements, and not searching for the hole --- limit
// search to backing store length.
if (static_cast<uint32_t>(elements->length()) < length) {
length = elements->length();
}
if (std::isnan(search_value)) {
return Just<int64_t>(-1);
}
ctype typed_search_value = static_cast<ctype>(search_value);
if (static_cast<double>(typed_search_value) != search_value) {
return Just<int64_t>(-1); // Loss of precision.
}
for (uint32_t k = start_from; k < length; ++k) {
ctype element_k = elements->get_scalar(k);
if (element_k == typed_search_value) return Just<int64_t>(k);
}
return Just<int64_t>(-1);
}
};
#define FIXED_ELEMENTS_ACCESSOR(Type, type, TYPE, ctype, size) \
typedef TypedElementsAccessor<TYPE##_ELEMENTS, ctype> \
Fixed##Type##ElementsAccessor;
TYPED_ARRAYS(FIXED_ELEMENTS_ACCESSOR)
#undef FIXED_ELEMENTS_ACCESSOR
template <typename Subclass, typename ArgumentsAccessor, typename KindTraits>
class SloppyArgumentsElementsAccessor
: public ElementsAccessorBase<Subclass, KindTraits> {
public:
explicit SloppyArgumentsElementsAccessor(const char* name)
: ElementsAccessorBase<Subclass, KindTraits>(name) {
USE(KindTraits::Kind);
}
static Handle<Object> GetImpl(Isolate* isolate, FixedArrayBase* parameters,
uint32_t entry) {
Handle<FixedArray> parameter_map(FixedArray::cast(parameters), isolate);
uint32_t length = parameter_map->length() - 2;
if (entry < length) {
DisallowHeapAllocation no_gc;
Object* probe = parameter_map->get(entry + 2);
Context* context = Context::cast(parameter_map->get(0));
int context_entry = Smi::cast(probe)->value();
DCHECK(!context->get(context_entry)->IsTheHole(isolate));
return handle(context->get(context_entry), isolate);
} else {
// Object is not mapped, defer to the arguments.
Handle<Object> result = ArgumentsAccessor::GetImpl(
isolate, FixedArray::cast(parameter_map->get(1)), entry - length);
// Elements of the arguments object in slow mode might be slow aliases.
if (result->IsAliasedArgumentsEntry()) {
DisallowHeapAllocation no_gc;
AliasedArgumentsEntry* alias = AliasedArgumentsEntry::cast(*result);
Context* context = Context::cast(parameter_map->get(0));
int context_entry = alias->aliased_context_slot();
DCHECK(!context->get(context_entry)->IsTheHole(isolate));
return handle(context->get(context_entry), isolate);
}
return result;
}
}
static void TransitionElementsKindImpl(Handle<JSObject> object,
Handle<Map> map) {
UNREACHABLE();
}
static void GrowCapacityAndConvertImpl(Handle<JSObject> object,
uint32_t capacity) {
UNREACHABLE();
}
static inline void SetImpl(Handle<JSObject> holder, uint32_t entry,
Object* value) {
SetImpl(holder->elements(), entry, value);
}
static inline void SetImpl(FixedArrayBase* store, uint32_t entry,
Object* value) {
FixedArray* parameter_map = FixedArray::cast(store);
uint32_t length = parameter_map->length() - 2;
if (entry < length) {
Object* probe = parameter_map->get(entry + 2);
Context* context = Context::cast(parameter_map->get(0));
int context_entry = Smi::cast(probe)->value();
DCHECK(!context->get(context_entry)->IsTheHole(store->GetIsolate()));
context->set(context_entry, value);
} else {
FixedArray* arguments = FixedArray::cast(parameter_map->get(1));
Object* current = ArgumentsAccessor::GetRaw(arguments, entry - length);
if (current->IsAliasedArgumentsEntry()) {
AliasedArgumentsEntry* alias = AliasedArgumentsEntry::cast(current);
Context* context = Context::cast(parameter_map->get(0));
int context_entry = alias->aliased_context_slot();
DCHECK(!context->get(context_entry)->IsTheHole(store->GetIsolate()));
context->set(context_entry, value);
} else {
ArgumentsAccessor::SetImpl(arguments, entry - length, value);
}
}
}
static void SetLengthImpl(Isolate* isolate, Handle<JSArray> array,
uint32_t length,
Handle<FixedArrayBase> parameter_map) {
// Sloppy arguments objects are not arrays.
UNREACHABLE();
}
static uint32_t GetCapacityImpl(JSObject* holder,
FixedArrayBase* backing_store) {
FixedArray* parameter_map = FixedArray::cast(backing_store);
FixedArrayBase* arguments = FixedArrayBase::cast(parameter_map->get(1));
return parameter_map->length() - 2 +
ArgumentsAccessor::GetCapacityImpl(holder, arguments);
}
static uint32_t GetMaxNumberOfEntries(JSObject* holder,
FixedArrayBase* backing_store) {
FixedArray* parameter_map = FixedArray::cast(backing_store);
FixedArrayBase* arguments = FixedArrayBase::cast(parameter_map->get(1));
return parameter_map->length() - 2 +
ArgumentsAccessor::GetMaxNumberOfEntries(holder, arguments);
}
static uint32_t NumberOfElementsImpl(JSObject* receiver,
FixedArrayBase* backing_store) {
FixedArray* parameter_map = FixedArray::cast(backing_store);
FixedArrayBase* arguments = FixedArrayBase::cast(parameter_map->get(1));
uint32_t nof_elements = 0;
uint32_t length = parameter_map->length() - 2;
for (uint32_t entry = 0; entry < length; entry++) {
if (HasParameterMapArg(parameter_map, entry)) nof_elements++;
}
return nof_elements +
ArgumentsAccessor::NumberOfElementsImpl(receiver, arguments);
}
static void AddElementsToKeyAccumulatorImpl(Handle<JSObject> receiver,
KeyAccumulator* accumulator,
AddKeyConversion convert) {
Isolate* isolate = accumulator->isolate();
Handle<FixedArrayBase> elements(receiver->elements(), isolate);
uint32_t length = GetCapacityImpl(*receiver, *elements);
for (uint32_t entry = 0; entry < length; entry++) {
if (!HasEntryImpl(isolate, *elements, entry)) continue;
Handle<Object> value = GetImpl(isolate, *elements, entry);
accumulator->AddKey(value, convert);
}
}
static bool HasEntryImpl(Isolate* isolate, FixedArrayBase* parameters,
uint32_t entry) {
FixedArray* parameter_map = FixedArray::cast(parameters);
uint32_t length = parameter_map->length() - 2;
if (entry < length) {
return HasParameterMapArg(parameter_map, entry);
}
FixedArrayBase* arguments = FixedArrayBase::cast(parameter_map->get(1));
return ArgumentsAccessor::HasEntryImpl(isolate, arguments, entry - length);
}
static bool HasAccessorsImpl(JSObject* holder,
FixedArrayBase* backing_store) {
FixedArray* parameter_map = FixedArray::cast(backing_store);
FixedArrayBase* arguments = FixedArrayBase::cast(parameter_map->get(1));
return ArgumentsAccessor::HasAccessorsImpl(holder, arguments);
}
static uint32_t GetIndexForEntryImpl(FixedArrayBase* parameters,
uint32_t entry) {
FixedArray* parameter_map = FixedArray::cast(parameters);
uint32_t length = parameter_map->length() - 2;
if (entry < length) return entry;
FixedArray* arguments = FixedArray::cast(parameter_map->get(1));
return ArgumentsAccessor::GetIndexForEntryImpl(arguments, entry - length);
}
static uint32_t GetEntryForIndexImpl(Isolate* isolate, JSObject* holder,
FixedArrayBase* parameters,
uint32_t index, PropertyFilter filter) {
FixedArray* parameter_map = FixedArray::cast(parameters);
if (HasParameterMapArg(parameter_map, index)) return index;
FixedArray* arguments = FixedArray::cast(parameter_map->get(1));
uint32_t entry = ArgumentsAccessor::GetEntryForIndexImpl(
isolate, holder, arguments, index, filter);
if (entry == kMaxUInt32) return kMaxUInt32;
return (parameter_map->length() - 2) + entry;
}
static PropertyDetails GetDetailsImpl(JSObject* holder, uint32_t entry) {
FixedArray* parameter_map = FixedArray::cast(holder->elements());
uint32_t length = parameter_map->length() - 2;
if (entry < length) {
return PropertyDetails(NONE, DATA, 0, PropertyCellType::kNoCell);
}
FixedArray* arguments = FixedArray::cast(parameter_map->get(1));
return ArgumentsAccessor::GetDetailsImpl(arguments, entry - length);
}
static bool HasParameterMapArg(FixedArray* parameter_map, uint32_t index) {
uint32_t length = parameter_map->length() - 2;
if (index >= length) return false;
return !parameter_map->get(index + 2)->IsTheHole(
parameter_map->GetIsolate());
}
static void DeleteImpl(Handle<JSObject> obj, uint32_t entry) {
FixedArray* parameter_map = FixedArray::cast(obj->elements());
uint32_t length = static_cast<uint32_t>(parameter_map->length()) - 2;
if (entry < length) {
// TODO(kmillikin): We could check if this was the last aliased
// parameter, and revert to normal elements in that case. That
// would enable GC of the context.
parameter_map->set_the_hole(entry + 2);
} else {
Subclass::DeleteFromArguments(obj, entry - length);
}
}
static void CollectElementIndicesImpl(Handle<JSObject> object,
Handle<FixedArrayBase> backing_store,
KeyAccumulator* keys) {
Isolate* isolate = keys->isolate();
uint32_t nof_indices = 0;
Handle<FixedArray> indices = isolate->factory()->NewFixedArray(
GetCapacityImpl(*object, *backing_store));
DirectCollectElementIndicesImpl(isolate, object, backing_store,
GetKeysConversion::kKeepNumbers,
ENUMERABLE_STRINGS, indices, &nof_indices);
SortIndices(indices, nof_indices);
for (uint32_t i = 0; i < nof_indices; i++) {
keys->AddKey(indices->get(i));
}
}
static Handle<FixedArray> DirectCollectElementIndicesImpl(
Isolate* isolate, Handle<JSObject> object,
Handle<FixedArrayBase> backing_store, GetKeysConversion convert,
PropertyFilter filter, Handle<FixedArray> list, uint32_t* nof_indices,
uint32_t insertion_index = 0) {
Handle<FixedArray> parameter_map(FixedArray::cast(*backing_store), isolate);
uint32_t length = parameter_map->length() - 2;
for (uint32_t i = 0; i < length; ++i) {
if (parameter_map->get(i + 2)->IsTheHole(isolate)) continue;
if (convert == GetKeysConversion::kConvertToString) {
Handle<String> index_string = isolate->factory()->Uint32ToString(i);
list->set(insertion_index, *index_string);
} else {
list->set(insertion_index, Smi::FromInt(i), SKIP_WRITE_BARRIER);
}
insertion_index++;
}
Handle<FixedArrayBase> store(FixedArrayBase::cast(parameter_map->get(1)));
return ArgumentsAccessor::DirectCollectElementIndicesImpl(
isolate, object, store, convert, filter, list, nof_indices,
insertion_index);
}
static Maybe<bool> IncludesValueImpl(Isolate* isolate,
Handle<JSObject> object,
Handle<Object> value,
uint32_t start_from, uint32_t length) {
DCHECK(JSObject::PrototypeHasNoElements(isolate, *object));
Handle<Map> original_map = handle(object->map(), isolate);
Handle<FixedArray> parameter_map(FixedArray::cast(object->elements()),
isolate);
bool search_for_hole = value->IsUndefined(isolate);
for (uint32_t k = start_from; k < length; ++k) {
uint32_t entry = GetEntryForIndexImpl(isolate, *object, *parameter_map, k,
ALL_PROPERTIES);
if (entry == kMaxUInt32) {
if (search_for_hole) return Just(true);
continue;
}
Handle<Object> element_k =
Subclass::GetImpl(isolate, *parameter_map, entry);
if (element_k->IsAccessorPair()) {
LookupIterator it(isolate, object, k, LookupIterator::OWN);
DCHECK(it.IsFound());
DCHECK_EQ(it.state(), LookupIterator::ACCESSOR);
ASSIGN_RETURN_ON_EXCEPTION_VALUE(isolate, element_k,
Object::GetPropertyWithAccessor(&it),
Nothing<bool>());
if (value->SameValueZero(*element_k)) return Just(true);
if (object->map() != *original_map) {
// Some mutation occurred in accessor. Abort "fast" path
return IncludesValueSlowPath(isolate, object, value, k + 1, length);
}
} else if (value->SameValueZero(*element_k)) {
return Just(true);
}
}
return Just(false);
}
static Maybe<int64_t> IndexOfValueImpl(Isolate* isolate,
Handle<JSObject> object,
Handle<Object> value,
uint32_t start_from, uint32_t length) {
DCHECK(JSObject::PrototypeHasNoElements(isolate, *object));
Handle<Map> original_map = handle(object->map(), isolate);
Handle<FixedArray> parameter_map(FixedArray::cast(object->elements()),
isolate);
for (uint32_t k = start_from; k < length; ++k) {
uint32_t entry = GetEntryForIndexImpl(isolate, *object, *parameter_map, k,
ALL_PROPERTIES);
if (entry == kMaxUInt32) {
continue;
}
Handle<Object> element_k =
Subclass::GetImpl(isolate, *parameter_map, entry);
if (element_k->IsAccessorPair()) {
LookupIterator it(isolate, object, k, LookupIterator::OWN);
DCHECK(it.IsFound());
DCHECK_EQ(it.state(), LookupIterator::ACCESSOR);
ASSIGN_RETURN_ON_EXCEPTION_VALUE(isolate, element_k,
Object::GetPropertyWithAccessor(&it),
Nothing<int64_t>());
if (value->StrictEquals(*element_k)) {
return Just<int64_t>(k);
}
if (object->map() != *original_map) {
// Some mutation occurred in accessor. Abort "fast" path.
return IndexOfValueSlowPath(isolate, object, value, k + 1, length);
}
} else if (value->StrictEquals(*element_k)) {
return Just<int64_t>(k);
}
}
return Just<int64_t>(-1);
}
};
class SlowSloppyArgumentsElementsAccessor
: public SloppyArgumentsElementsAccessor<
SlowSloppyArgumentsElementsAccessor, DictionaryElementsAccessor,
ElementsKindTraits<SLOW_SLOPPY_ARGUMENTS_ELEMENTS> > {
public:
explicit SlowSloppyArgumentsElementsAccessor(const char* name)
: SloppyArgumentsElementsAccessor<
SlowSloppyArgumentsElementsAccessor, DictionaryElementsAccessor,
ElementsKindTraits<SLOW_SLOPPY_ARGUMENTS_ELEMENTS> >(name) {}
static void DeleteFromArguments(Handle<JSObject> obj, uint32_t entry) {
Handle<FixedArray> parameter_map(FixedArray::cast(obj->elements()));
Handle<SeededNumberDictionary> dict(
SeededNumberDictionary::cast(parameter_map->get(1)));
// TODO(verwaest): Remove reliance on index in Shrink.
uint32_t index = GetIndexForEntryImpl(*dict, entry);
Handle<Object> result = SeededNumberDictionary::DeleteProperty(dict, entry);
USE(result);
DCHECK(result->IsTrue(dict->GetIsolate()));
Handle<FixedArray> new_elements =
SeededNumberDictionary::Shrink(dict, index);
parameter_map->set(1, *new_elements);
}
static void AddImpl(Handle<JSObject> object, uint32_t index,
Handle<Object> value, PropertyAttributes attributes,
uint32_t new_capacity) {
Handle<FixedArray> parameter_map(FixedArray::cast(object->elements()));
Handle<FixedArrayBase> old_elements(
FixedArrayBase::cast(parameter_map->get(1)));
Handle<SeededNumberDictionary> dictionary =
old_elements->IsSeededNumberDictionary()
? Handle<SeededNumberDictionary>::cast(old_elements)
: JSObject::NormalizeElements(object);
PropertyDetails details(attributes, DATA, 0, PropertyCellType::kNoCell);
Handle<SeededNumberDictionary> new_dictionary =
SeededNumberDictionary::AddNumberEntry(dictionary, index, value,
details, object);
if (attributes != NONE) object->RequireSlowElements(*new_dictionary);
if (*dictionary != *new_dictionary) {
FixedArray::cast(object->elements())->set(1, *new_dictionary);
}
}
static void ReconfigureImpl(Handle<JSObject> object,
Handle<FixedArrayBase> store, uint32_t entry,
Handle<Object> value,
PropertyAttributes attributes) {
Handle<FixedArray> parameter_map = Handle<FixedArray>::cast(store);
uint32_t length = parameter_map->length() - 2;
Isolate* isolate = store->GetIsolate();
if (entry < length) {
Object* probe = parameter_map->get(entry + 2);
DCHECK(!probe->IsTheHole(isolate));
Context* context = Context::cast(parameter_map->get(0));
int context_entry = Smi::cast(probe)->value();
DCHECK(!context->get(context_entry)->IsTheHole(isolate));
context->set(context_entry, *value);
// Redefining attributes of an aliased element destroys fast aliasing.
parameter_map->set_the_hole(isolate, entry + 2);
// For elements that are still writable we re-establish slow aliasing.
if ((attributes & READ_ONLY) == 0) {
value = isolate->factory()->NewAliasedArgumentsEntry(context_entry);
}
PropertyDetails details(attributes, DATA, 0, PropertyCellType::kNoCell);
Handle<SeededNumberDictionary> arguments(
SeededNumberDictionary::cast(parameter_map->get(1)), isolate);
arguments = SeededNumberDictionary::AddNumberEntry(
arguments, entry, value, details, object);
// If the attributes were NONE, we would have called set rather than
// reconfigure.
DCHECK_NE(NONE, attributes);
object->RequireSlowElements(*arguments);
parameter_map->set(1, *arguments);
} else {
Handle<FixedArrayBase> arguments(
FixedArrayBase::cast(parameter_map->get(1)), isolate);
DictionaryElementsAccessor::ReconfigureImpl(
object, arguments, entry - length, value, attributes);
}
}
};
class FastSloppyArgumentsElementsAccessor
: public SloppyArgumentsElementsAccessor<
FastSloppyArgumentsElementsAccessor, FastHoleyObjectElementsAccessor,
ElementsKindTraits<FAST_SLOPPY_ARGUMENTS_ELEMENTS> > {
public:
explicit FastSloppyArgumentsElementsAccessor(const char* name)
: SloppyArgumentsElementsAccessor<
FastSloppyArgumentsElementsAccessor,
FastHoleyObjectElementsAccessor,
ElementsKindTraits<FAST_SLOPPY_ARGUMENTS_ELEMENTS> >(name) {}
static Handle<FixedArray> GetArguments(Isolate* isolate,
FixedArrayBase* backing_store) {
FixedArray* parameter_map = FixedArray::cast(backing_store);
return Handle<FixedArray>(FixedArray::cast(parameter_map->get(1)), isolate);
}
static Handle<JSArray> SliceImpl(Handle<JSObject> receiver, uint32_t start,
uint32_t end) {
Isolate* isolate = receiver->GetIsolate();
uint32_t result_len = end < start ? 0u : end - start;
Handle<JSArray> result_array = isolate->factory()->NewJSArray(
FAST_HOLEY_ELEMENTS, result_len, result_len);
DisallowHeapAllocation no_gc;
FixedArray* elements = FixedArray::cast(result_array->elements());
FixedArray* parameters = FixedArray::cast(receiver->elements());
uint32_t insertion_index = 0;
for (uint32_t i = start; i < end; i++) {
uint32_t entry = GetEntryForIndexImpl(isolate, *receiver, parameters, i,
ALL_PROPERTIES);
if (entry != kMaxUInt32 && HasEntryImpl(isolate, parameters, entry)) {
elements->set(insertion_index, *GetImpl(isolate, parameters, entry));
} else {
elements->set_the_hole(isolate, insertion_index);
}
insertion_index++;
}
return result_array;
}
static Handle<SeededNumberDictionary> NormalizeImpl(
Handle<JSObject> object, Handle<FixedArrayBase> elements) {
Handle<FixedArray> arguments =
GetArguments(elements->GetIsolate(), *elements);
return FastHoleyObjectElementsAccessor::NormalizeImpl(object, arguments);
}
static void DeleteFromArguments(Handle<JSObject> obj, uint32_t entry) {
Handle<FixedArray> arguments =
GetArguments(obj->GetIsolate(), obj->elements());
FastHoleyObjectElementsAccessor::DeleteCommon(obj, entry, arguments);
}
static void AddImpl(Handle<JSObject> object, uint32_t index,
Handle<Object> value, PropertyAttributes attributes,
uint32_t new_capacity) {
DCHECK_EQ(NONE, attributes);
Handle<FixedArray> parameter_map(FixedArray::cast(object->elements()));
Handle<FixedArrayBase> old_elements(
FixedArrayBase::cast(parameter_map->get(1)));
if (old_elements->IsSeededNumberDictionary() ||
static_cast<uint32_t>(old_elements->length()) < new_capacity) {
GrowCapacityAndConvertImpl(object, new_capacity);
}
FixedArray* arguments = FixedArray::cast(parameter_map->get(1));
// For fast holey objects, the entry equals the index. The code above made
// sure that there's enough space to store the value. We cannot convert
// index to entry explicitly since the slot still contains the hole, so the
// current EntryForIndex would indicate that it is "absent" by returning
// kMaxUInt32.
FastHoleyObjectElementsAccessor::SetImpl(arguments, index, *value);
}
static void ReconfigureImpl(Handle<JSObject> object,
Handle<FixedArrayBase> store, uint32_t entry,
Handle<Object> value,
PropertyAttributes attributes) {
Handle<SeededNumberDictionary> dictionary =
JSObject::NormalizeElements(object);
FixedArray::cast(*store)->set(1, *dictionary);
uint32_t length = static_cast<uint32_t>(store->length()) - 2;
if (entry >= length) {
entry = dictionary->FindEntry(entry - length) + length;
}
SlowSloppyArgumentsElementsAccessor::ReconfigureImpl(object, store, entry,
value, attributes);
}
static void CopyElementsImpl(FixedArrayBase* from, uint32_t from_start,
FixedArrayBase* to, ElementsKind from_kind,
uint32_t to_start, int packed_size,
int copy_size) {
DCHECK(!to->IsDictionary());
if (from_kind == SLOW_SLOPPY_ARGUMENTS_ELEMENTS) {
CopyDictionaryToObjectElements(from, from_start, to, FAST_HOLEY_ELEMENTS,
to_start, copy_size);
} else {
DCHECK_EQ(FAST_SLOPPY_ARGUMENTS_ELEMENTS, from_kind);
CopyObjectToObjectElements(from, FAST_HOLEY_ELEMENTS, from_start, to,
FAST_HOLEY_ELEMENTS, to_start, copy_size);
}
}
static void GrowCapacityAndConvertImpl(Handle<JSObject> object,
uint32_t capacity) {
Handle<FixedArray> parameter_map(FixedArray::cast(object->elements()));
Handle<FixedArray> old_elements(FixedArray::cast(parameter_map->get(1)));
ElementsKind from_kind = object->GetElementsKind();
// This method should only be called if there's a reason to update the
// elements.
DCHECK(from_kind == SLOW_SLOPPY_ARGUMENTS_ELEMENTS ||
static_cast<uint32_t>(old_elements->length()) < capacity);
Handle<FixedArrayBase> elements =
ConvertElementsWithCapacity(object, old_elements, from_kind, capacity);
Handle<Map> new_map = JSObject::GetElementsTransitionMap(
object, FAST_SLOPPY_ARGUMENTS_ELEMENTS);
JSObject::MigrateToMap(object, new_map);
parameter_map->set(1, *elements);
JSObject::ValidateElements(object);
}
};
template <typename Subclass, typename BackingStoreAccessor, typename KindTraits>
class StringWrapperElementsAccessor
: public ElementsAccessorBase<Subclass, KindTraits> {
public:
explicit StringWrapperElementsAccessor(const char* name)
: ElementsAccessorBase<Subclass, KindTraits>(name) {
USE(KindTraits::Kind);
}
static Handle<Object> GetInternalImpl(Handle<JSObject> holder,
uint32_t entry) {
return GetImpl(holder, entry);
}
static Handle<Object> GetImpl(Handle<JSObject> holder, uint32_t entry) {
Isolate* isolate = holder->GetIsolate();
Handle<String> string(GetString(*holder), isolate);
uint32_t length = static_cast<uint32_t>(string->length());
if (entry < length) {
return isolate->factory()->LookupSingleCharacterStringFromCode(
String::Flatten(string)->Get(entry));
}
return BackingStoreAccessor::GetImpl(isolate, holder->elements(),
entry - length);
}
static Handle<Object> GetImpl(Isolate* isolate, FixedArrayBase* elements,
uint32_t entry) {
UNREACHABLE();
return Handle<Object>();
}
static PropertyDetails GetDetailsImpl(JSObject* holder, uint32_t entry) {
uint32_t length = static_cast<uint32_t>(GetString(holder)->length());
if (entry < length) {
PropertyAttributes attributes =
static_cast<PropertyAttributes>(READ_ONLY | DONT_DELETE);
return PropertyDetails(attributes, v8::internal::DATA, 0,
PropertyCellType::kNoCell);
}
return BackingStoreAccessor::GetDetailsImpl(holder, entry - length);
}
static uint32_t GetEntryForIndexImpl(Isolate* isolate, JSObject* holder,
FixedArrayBase* backing_store,
uint32_t index, PropertyFilter filter) {
uint32_t length = static_cast<uint32_t>(GetString(holder)->length());
if (index < length) return index;
uint32_t backing_store_entry = BackingStoreAccessor::GetEntryForIndexImpl(
isolate, holder, backing_store, index, filter);
if (backing_store_entry == kMaxUInt32) return kMaxUInt32;
DCHECK(backing_store_entry < kMaxUInt32 - length);
return backing_store_entry + length;
}
static void DeleteImpl(Handle<JSObject> holder, uint32_t entry) {
uint32_t length = static_cast<uint32_t>(GetString(*holder)->length());
if (entry < length) {
return; // String contents can't be deleted.
}
BackingStoreAccessor::DeleteImpl(holder, entry - length);
}
static void SetImpl(Handle<JSObject> holder, uint32_t entry, Object* value) {
uint32_t length = static_cast<uint32_t>(GetString(*holder)->length());
if (entry < length) {
return; // String contents are read-only.
}
BackingStoreAccessor::SetImpl(holder->elements(), entry - length, value);
}
static void AddImpl(Handle<JSObject> object, uint32_t index,
Handle<Object> value, PropertyAttributes attributes,
uint32_t new_capacity) {
DCHECK(index >= static_cast<uint32_t>(GetString(*object)->length()));
// Explicitly grow fast backing stores if needed. Dictionaries know how to
// extend their capacity themselves.
if (KindTraits::Kind == FAST_STRING_WRAPPER_ELEMENTS &&
(object->GetElementsKind() == SLOW_STRING_WRAPPER_ELEMENTS ||
BackingStoreAccessor::GetCapacityImpl(*object, object->elements()) !=
new_capacity)) {
GrowCapacityAndConvertImpl(object, new_capacity);
}
BackingStoreAccessor::AddImpl(object, index, value, attributes,
new_capacity);
}
static void ReconfigureImpl(Handle<JSObject> object,
Handle<FixedArrayBase> store, uint32_t entry,
Handle<Object> value,
PropertyAttributes attributes) {
uint32_t length = static_cast<uint32_t>(GetString(*object)->length());
if (entry < length) {
return; // String contents can't be reconfigured.
}
BackingStoreAccessor::ReconfigureImpl(object, store, entry - length, value,
attributes);
}
static void AddElementsToKeyAccumulatorImpl(Handle<JSObject> receiver,
KeyAccumulator* accumulator,
AddKeyConversion convert) {
Isolate* isolate = receiver->GetIsolate();
Handle<String> string(GetString(*receiver), isolate);
string = String::Flatten(string);
uint32_t length = static_cast<uint32_t>(string->length());
for (uint32_t i = 0; i < length; i++) {
accumulator->AddKey(
isolate->factory()->LookupSingleCharacterStringFromCode(
string->Get(i)),
convert);
}
BackingStoreAccessor::AddElementsToKeyAccumulatorImpl(receiver, accumulator,
convert);
}
static void CollectElementIndicesImpl(Handle<JSObject> object,
Handle<FixedArrayBase> backing_store,
KeyAccumulator* keys) {
uint32_t length = GetString(*object)->length();
Factory* factory = keys->isolate()->factory();
for (uint32_t i = 0; i < length; i++) {
keys->AddKey(factory->NewNumberFromUint(i));
}
BackingStoreAccessor::CollectElementIndicesImpl(object, backing_store,
keys);
}
static void GrowCapacityAndConvertImpl(Handle<JSObject> object,
uint32_t capacity) {
Handle<FixedArrayBase> old_elements(object->elements());
ElementsKind from_kind = object->GetElementsKind();
// This method should only be called if there's a reason to update the
// elements.
DCHECK(from_kind == SLOW_STRING_WRAPPER_ELEMENTS ||
static_cast<uint32_t>(old_elements->length()) < capacity);
Subclass::BasicGrowCapacityAndConvertImpl(object, old_elements, from_kind,
FAST_STRING_WRAPPER_ELEMENTS,
capacity);
}
static void CopyElementsImpl(FixedArrayBase* from, uint32_t from_start,
FixedArrayBase* to, ElementsKind from_kind,
uint32_t to_start, int packed_size,
int copy_size) {
DCHECK(!to->IsDictionary());
if (from_kind == SLOW_STRING_WRAPPER_ELEMENTS) {
CopyDictionaryToObjectElements(from, from_start, to, FAST_HOLEY_ELEMENTS,
to_start, copy_size);
} else {
DCHECK_EQ(FAST_STRING_WRAPPER_ELEMENTS, from_kind);
CopyObjectToObjectElements(from, FAST_HOLEY_ELEMENTS, from_start, to,
FAST_HOLEY_ELEMENTS, to_start, copy_size);
}
}
static uint32_t NumberOfElementsImpl(JSObject* object,
FixedArrayBase* backing_store) {
uint32_t length = GetString(object)->length();
return length +
BackingStoreAccessor::NumberOfElementsImpl(object, backing_store);
}
private:
static String* GetString(JSObject* holder) {
DCHECK(holder->IsJSValue());
JSValue* js_value = JSValue::cast(holder);
DCHECK(js_value->value()->IsString());
return String::cast(js_value->value());
}
};
class FastStringWrapperElementsAccessor
: public StringWrapperElementsAccessor<
FastStringWrapperElementsAccessor, FastHoleyObjectElementsAccessor,
ElementsKindTraits<FAST_STRING_WRAPPER_ELEMENTS>> {
public:
explicit FastStringWrapperElementsAccessor(const char* name)
: StringWrapperElementsAccessor<
FastStringWrapperElementsAccessor, FastHoleyObjectElementsAccessor,
ElementsKindTraits<FAST_STRING_WRAPPER_ELEMENTS>>(name) {}
static Handle<SeededNumberDictionary> NormalizeImpl(
Handle<JSObject> object, Handle<FixedArrayBase> elements) {
return FastHoleyObjectElementsAccessor::NormalizeImpl(object, elements);
}
};
class SlowStringWrapperElementsAccessor
: public StringWrapperElementsAccessor<
SlowStringWrapperElementsAccessor, DictionaryElementsAccessor,
ElementsKindTraits<SLOW_STRING_WRAPPER_ELEMENTS>> {
public:
explicit SlowStringWrapperElementsAccessor(const char* name)
: StringWrapperElementsAccessor<
SlowStringWrapperElementsAccessor, DictionaryElementsAccessor,
ElementsKindTraits<SLOW_STRING_WRAPPER_ELEMENTS>>(name) {}
static bool HasAccessorsImpl(JSObject* holder,
FixedArrayBase* backing_store) {
return DictionaryElementsAccessor::HasAccessorsImpl(holder, backing_store);
}
};
} // namespace
void CheckArrayAbuse(Handle<JSObject> obj, const char* op, uint32_t index,
bool allow_appending) {
DisallowHeapAllocation no_allocation;
Object* raw_length = NULL;
const char* elements_type = "array";
if (obj->IsJSArray()) {
JSArray* array = JSArray::cast(*obj);
raw_length = array->length();
} else {
raw_length = Smi::FromInt(obj->elements()->length());
elements_type = "object";
}
if (raw_length->IsNumber()) {
double n = raw_length->Number();
if (FastI2D(FastD2UI(n)) == n) {
int32_t int32_length = DoubleToInt32(n);
uint32_t compare_length = static_cast<uint32_t>(int32_length);
if (allow_appending) compare_length++;
if (index >= compare_length) {
PrintF("[OOB %s %s (%s length = %d, element accessed = %d) in ",
elements_type, op, elements_type, static_cast<int>(int32_length),
static_cast<int>(index));
TraceTopFrame(obj->GetIsolate());
PrintF("]\n");
}
} else {
PrintF("[%s elements length not integer value in ", elements_type);
TraceTopFrame(obj->GetIsolate());
PrintF("]\n");
}
} else {
PrintF("[%s elements length not a number in ", elements_type);
TraceTopFrame(obj->GetIsolate());
PrintF("]\n");
}
}
MaybeHandle<Object> ArrayConstructInitializeElements(Handle<JSArray> array,
Arguments* args) {
if (args->length() == 0) {
// Optimize the case where there are no parameters passed.
JSArray::Initialize(array, JSArray::kPreallocatedArrayElements);
return array;
} else if (args->length() == 1 && args->at(0)->IsNumber()) {
uint32_t length;
if (!args->at(0)->ToArrayLength(&length)) {
return ThrowArrayLengthRangeError(array->GetIsolate());
}
// Optimize the case where there is one argument and the argument is a small
// smi.
if (length > 0 && length < JSArray::kInitialMaxFastElementArray) {
ElementsKind elements_kind = array->GetElementsKind();
JSArray::Initialize(array, length, length);
if (!IsFastHoleyElementsKind(elements_kind)) {
elements_kind = GetHoleyElementsKind(elements_kind);
JSObject::TransitionElementsKind(array, elements_kind);
}
} else if (length == 0) {
JSArray::Initialize(array, JSArray::kPreallocatedArrayElements);
} else {
// Take the argument as the length.
JSArray::Initialize(array, 0);
JSArray::SetLength(array, length);
}
return array;
}
Factory* factory = array->GetIsolate()->factory();
// Set length and elements on the array.
int number_of_elements = args->length();
JSObject::EnsureCanContainElements(
array, args, 0, number_of_elements, ALLOW_CONVERTED_DOUBLE_ELEMENTS);
// Allocate an appropriately typed elements array.
ElementsKind elements_kind = array->GetElementsKind();
Handle<FixedArrayBase> elms;
if (IsFastDoubleElementsKind(elements_kind)) {
elms = Handle<FixedArrayBase>::cast(
factory->NewFixedDoubleArray(number_of_elements));
} else {
elms = Handle<FixedArrayBase>::cast(
factory->NewFixedArrayWithHoles(number_of_elements));
}
// Fill in the content
switch (elements_kind) {
case FAST_HOLEY_SMI_ELEMENTS:
case FAST_SMI_ELEMENTS: {
Handle<FixedArray> smi_elms = Handle<FixedArray>::cast(elms);
for (int entry = 0; entry < number_of_elements; entry++) {
smi_elms->set(entry, (*args)[entry], SKIP_WRITE_BARRIER);
}
break;
}
case FAST_HOLEY_ELEMENTS:
case FAST_ELEMENTS: {
DisallowHeapAllocation no_gc;
WriteBarrierMode mode = elms->GetWriteBarrierMode(no_gc);
Handle<FixedArray> object_elms = Handle<FixedArray>::cast(elms);
for (int entry = 0; entry < number_of_elements; entry++) {
object_elms->set(entry, (*args)[entry], mode);
}
break;
}
case FAST_HOLEY_DOUBLE_ELEMENTS:
case FAST_DOUBLE_ELEMENTS: {
Handle<FixedDoubleArray> double_elms =
Handle<FixedDoubleArray>::cast(elms);
for (int entry = 0; entry < number_of_elements; entry++) {
double_elms->set(entry, (*args)[entry]->Number());
}
break;
}
default:
UNREACHABLE();
break;
}
array->set_elements(*elms);
array->set_length(Smi::FromInt(number_of_elements));
return array;
}
void ElementsAccessor::InitializeOncePerProcess() {
static ElementsAccessor* accessor_array[] = {
#define ACCESSOR_ARRAY(Class, Kind, Store) new Class(#Kind),
ELEMENTS_LIST(ACCESSOR_ARRAY)
#undef ACCESSOR_ARRAY
};
STATIC_ASSERT((sizeof(accessor_array) / sizeof(*accessor_array)) ==
kElementsKindCount);
elements_accessors_ = accessor_array;
}
void ElementsAccessor::TearDown() {
if (elements_accessors_ == NULL) return;
#define ACCESSOR_DELETE(Class, Kind, Store) delete elements_accessors_[Kind];
ELEMENTS_LIST(ACCESSOR_DELETE)
#undef ACCESSOR_DELETE
elements_accessors_ = NULL;
}
Handle<JSArray> ElementsAccessor::Concat(Isolate* isolate, Arguments* args,
uint32_t concat_size,
uint32_t result_len) {
ElementsKind result_elements_kind = GetInitialFastElementsKind();
bool has_raw_doubles = false;
{
DisallowHeapAllocation no_gc;
bool is_holey = false;
for (uint32_t i = 0; i < concat_size; i++) {
Object* arg = (*args)[i];
ElementsKind arg_kind = JSArray::cast(arg)->GetElementsKind();
has_raw_doubles = has_raw_doubles || IsFastDoubleElementsKind(arg_kind);
is_holey = is_holey || IsFastHoleyElementsKind(arg_kind);
result_elements_kind =
GetMoreGeneralElementsKind(result_elements_kind, arg_kind);
}
if (is_holey) {
result_elements_kind = GetHoleyElementsKind(result_elements_kind);
}
}
// If a double array is concatted into a fast elements array, the fast
// elements array needs to be initialized to contain proper holes, since
// boxing doubles may cause incremental marking.
bool requires_double_boxing =
has_raw_doubles && !IsFastDoubleElementsKind(result_elements_kind);
ArrayStorageAllocationMode mode = requires_double_boxing
? INITIALIZE_ARRAY_ELEMENTS_WITH_HOLE
: DONT_INITIALIZE_ARRAY_ELEMENTS;
Handle<JSArray> result_array = isolate->factory()->NewJSArray(
result_elements_kind, result_len, result_len, mode);
if (result_len == 0) return result_array;
uint32_t insertion_index = 0;
Handle<FixedArrayBase> storage(result_array->elements(), isolate);
ElementsAccessor* accessor = ElementsAccessor::ForKind(result_elements_kind);
for (uint32_t i = 0; i < concat_size; i++) {
// It is crucial to keep |array| in a raw pointer form to avoid
// performance degradation.
JSArray* array = JSArray::cast((*args)[i]);
uint32_t len = 0;
array->length()->ToArrayLength(&len);
if (len == 0) continue;
ElementsKind from_kind = array->GetElementsKind();
accessor->CopyElements(array, 0, from_kind, storage, insertion_index, len);
insertion_index += len;
}
DCHECK_EQ(insertion_index, result_len);
return result_array;
}
ElementsAccessor** ElementsAccessor::elements_accessors_ = NULL;
} // namespace internal
} // namespace v8