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elements.cc
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// Copyright 2012 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/elements.h"
#include "src/arguments.h"
#include "src/conversions.h"
#include "src/frames.h"
#include "src/heap/factory.h"
#include "src/heap/heap-write-barrier-inl.h"
#include "src/isolate-inl.h"
#include "src/messages.h"
#include "src/objects-inl.h"
#include "src/objects/arguments-inl.h"
#include "src/objects/hash-table-inl.h"
#include "src/objects/js-array-buffer-inl.h"
#include "src/objects/js-array-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
// - FixedBigUint64ElementsAccessor
// - FixedBigInt64ElementsAccessor
// - 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, PACKED_SMI_ELEMENTS, FixedArray) \
V(FastHoleySmiElementsAccessor, HOLEY_SMI_ELEMENTS, FixedArray) \
V(FastPackedObjectElementsAccessor, PACKED_ELEMENTS, FixedArray) \
V(FastHoleyObjectElementsAccessor, HOLEY_ELEMENTS, FixedArray) \
V(FastPackedDoubleElementsAccessor, PACKED_DOUBLE_ELEMENTS, \
FixedDoubleArray) \
V(FastHoleyDoubleElementsAccessor, HOLEY_DOUBLE_ELEMENTS, FixedDoubleArray) \
V(DictionaryElementsAccessor, DICTIONARY_ELEMENTS, NumberDictionary) \
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) \
V(FixedBigUint64ElementsAccessor, BIGUINT64_ELEMENTS, FixedBigUint64Array) \
V(FixedBigInt64ElementsAccessor, BIGINT64_ELEMENTS, FixedBigInt64Array)
template<ElementsKind Kind> class ElementsKindTraits {
public:
typedef FixedArrayBase BackingStore;
};
#define ELEMENTS_TRAITS(Class, KindParam, Store) \
template <> \
class ElementsKindTraits<KindParam> { \
public: /* NOLINT */ \
static constexpr ElementsKind Kind = KindParam; \
typedef Store BackingStore; \
}; \
constexpr ElementsKind ElementsKindTraits<KindParam>::Kind;
ELEMENTS_LIST(ELEMENTS_TRAITS)
#undef ELEMENTS_TRAITS
V8_WARN_UNUSED_RESULT
MaybeHandle<Object> ThrowArrayLengthRangeError(Isolate* isolate) {
THROW_NEW_ERROR(isolate, NewRangeError(MessageTemplate::kInvalidArrayLength),
Object);
}
WriteBarrierMode GetWriteBarrierMode(ElementsKind kind) {
if (IsSmiElementsKind(kind)) return SKIP_WRITE_BARRIER;
if (IsDoubleElementsKind(kind)) return SKIP_WRITE_BARRIER;
return UPDATE_WRITE_BARRIER;
}
void CopyObjectToObjectElements(Isolate* isolate, FixedArrayBase* from_base,
ElementsKind from_kind, uint32_t from_start,
FixedArrayBase* to_base, ElementsKind to_kind,
uint32_t to_start, int raw_copy_size) {
ReadOnlyRoots roots(isolate);
DCHECK(to_base->map() != roots.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) {
MemsetPointer(FixedArray::cast(to_base)->data_start() + start,
roots.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(IsSmiOrObjectElementsKind(from_kind));
DCHECK(IsSmiOrObjectElementsKind(to_kind));
WriteBarrierMode write_barrier_mode =
(IsObjectElementsKind(from_kind) && IsObjectElementsKind(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(
Isolate* isolate, FixedArrayBase* from_base, uint32_t from_start,
FixedArrayBase* to_base, ElementsKind to_kind, uint32_t to_start,
int raw_copy_size) {
DisallowHeapAllocation no_allocation;
NumberDictionary* from = NumberDictionary::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) {
MemsetPointer(FixedArray::cast(to_base)->data_start() + start,
ReadOnlyRoots(isolate).the_hole_value(), length);
}
}
}
DCHECK(to_base != from_base);
DCHECK(IsSmiOrObjectElementsKind(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 = GetWriteBarrierMode(to_kind);
for (int i = 0; i < copy_size; i++) {
int entry = from->FindEntry(isolate, i + from_start);
if (entry != NumberDictionary::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(Isolate* isolate,
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) {
MemsetPointer(FixedArray::cast(to_base)->data_start() + start,
ReadOnlyRoots(isolate).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.
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->GetReadOnlyRoots().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::ToInt(hole_or_smi));
}
}
}
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());
to->set(to_start, Smi::ToInt(smi));
}
}
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->GetReadOnlyRoots().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(
Isolate* isolate, FixedArrayBase* from_base, uint32_t from_start,
FixedArrayBase* to_base, uint32_t to_start, int raw_copy_size) {
DisallowHeapAllocation no_allocation;
NumberDictionary* from = NumberDictionary::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(isolate, i + from_start);
if (entry != NumberDictionary::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* current_code_object =
isolate->heap()->GcSafeFindCodeForInnerPointer(raw_frame->pc());
if (current_code_object->builtin_index() ==
Builtins::kFunctionPrototypeApply) {
PrintF("apply from ");
it.Advance();
raw_frame = it.frame();
}
}
JavaScriptFrame::PrintTop(isolate, stdout, false, true);
}
static void SortIndices(
Isolate* isolate, Handle<FixedArray> indices, uint32_t sort_size,
WriteBarrierMode write_barrier_mode = UPDATE_WRITE_BARRIER) {
// Use AtomicElement wrapper to ensure that std::sort uses atomic load and
// store operations that are safe for concurrent marking.
base::AtomicElement<Object*>* start =
reinterpret_cast<base::AtomicElement<Object*>*>(
indices->GetFirstElementAddress());
std::sort(start, start + sort_size,
[isolate](const base::AtomicElement<Object*>& elementA,
const base::AtomicElement<Object*>& elementB) {
const Object* a = elementA.value();
const Object* b = elementB.value();
if (a->IsSmi() || !a->IsUndefined(isolate)) {
if (!b->IsSmi() && b->IsUndefined(isolate)) {
return true;
}
return a->Number() < b->Number();
}
return !b->IsSmi() && b->IsUndefined(isolate);
});
if (write_barrier_mode != SKIP_WRITE_BARRIER) {
FIXED_ARRAY_ELEMENTS_WRITE_BARRIER(isolate->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);
}
// The InternalElementsAccessor is a helper class to expose otherwise protected
// methods to its subclasses. Namely, we don't want to publicly expose methods
// that take an entry (instead of an index) as an argument.
class InternalElementsAccessor : public ElementsAccessor {
public:
explicit InternalElementsAccessor(const char* name)
: ElementsAccessor(name) {}
virtual uint32_t GetEntryForIndex(Isolate* isolate, JSObject* holder,
FixedArrayBase* backing_store,
uint32_t index) = 0;
virtual PropertyDetails GetDetails(JSObject* holder, uint32_t entry) = 0;
};
// 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 InternalElementsAccessor {
public:
explicit ElementsAccessorBase(const char* name)
: InternalElementsAccessor(name) {}
typedef ElementsTraitsParam ElementsTraits;
typedef typename ElementsTraitsParam::BackingStore BackingStore;
static ElementsKind kind() { return ElementsTraits::Kind; }
static void ValidateContents(JSObject* holder, int length) {}
static void ValidateImpl(JSObject* holder) {
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 = JSArray::cast(holder)->length();
if (length_obj->IsSmi()) {
length = Smi::ToInt(length_obj);
}
} else {
length = fixed_array_base->length();
}
Subclass::ValidateContents(holder, length);
}
void Validate(JSObject* holder) final {
DisallowHeapAllocation no_gc;
Subclass::ValidateImpl(holder);
}
static bool IsPackedImpl(JSObject* holder, FixedArrayBase* backing_store,
uint32_t start, uint32_t end) {
DisallowHeapAllocation no_gc;
if (IsFastPackedElementsKind(kind())) return true;
Isolate* isolate = holder->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;
Handle<FixedArrayBase> backing_store(array->elements(),
array->GetIsolate());
int length = Smi::ToInt(array->length());
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(JSObject* holder, uint32_t index,
FixedArrayBase* backing_store, PropertyFilter filter) final {
return Subclass::HasElementImpl(holder->GetIsolate(), holder, index,
backing_store, filter);
}
static bool HasElementImpl(Isolate* isolate, JSObject* holder, uint32_t index,
FixedArrayBase* backing_store,
PropertyFilter filter = ALL_PROPERTIES) {
return Subclass::GetEntryForIndexImpl(isolate, holder, backing_store, index,
filter) != kMaxUInt32;
}
bool HasEntry(JSObject* holder, uint32_t entry) final {
return Subclass::HasEntryImpl(holder->GetIsolate(), holder->elements(),
entry);
}
static bool HasEntryImpl(Isolate* isolate, FixedArrayBase* backing_store,
uint32_t entry) {
UNIMPLEMENTED();
}
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();
}
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();
}
Handle<JSObject> Slice(Handle<JSObject> receiver, uint32_t start,
uint32_t end) final {
return Subclass::SliceImpl(receiver, start, end);
}
static Handle<JSObject> SliceImpl(Handle<JSObject> receiver, uint32_t start,
uint32_t end) {
UNREACHABLE();
}
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();
}
Handle<Object> Pop(Handle<JSArray> receiver) final {
return Subclass::PopImpl(receiver);
}
static Handle<Object> PopImpl(Handle<JSArray> receiver) {
UNREACHABLE();
}
Handle<Object> Shift(Handle<JSArray> receiver) final {
return Subclass::ShiftImpl(receiver);
}
static Handle<Object> ShiftImpl(Handle<JSArray> receiver) {
UNREACHABLE();
}
void SetLength(Handle<JSArray> array, uint32_t length) final {
Subclass::SetLengthImpl(array->GetIsolate(), array, length,
handle(array->elements(), array->GetIsolate()));
}
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 (!IsHoleyElementsKind(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 (IsSmiOrObjectElementsKind(kind())) {
JSObject::EnsureWritableFastElements(array);
if (array->elements() != *backing_store) {
backing_store = handle(array->elements(), isolate);
}
}
if (2 * length + JSObject::kMinAddedElementsCapacity <= capacity) {
// If more than half the elements won't be used, trim the array.
// Do not trim from short arrays to prevent frequent trimming on
// repeated pop operations.
// Leave some space to allow for subsequent push operations.
int elements_to_trim = length + 1 == old_length
? (capacity - length) / 2
: capacity - length;
isolate->heap()->RightTrimFixedArray(*backing_store, elements_to_trim);
// Fill the non-trimmed elements with holes.
BackingStore::cast(*backing_store)
->FillWithHoles(length,
std::min(old_length, capacity - elements_to_trim));
} 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::ToInt(JSArray::cast(receiver)->length()));
}
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 (IsDoubleElementsKind(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::ToInt(JSArray::cast(*object)->length());
}
Subclass::CopyElementsImpl(isolate, *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(), object->GetIsolate());
ElementsKind from_kind = from_map->elements_kind();
ElementsKind to_kind = to_map->elements_kind();
if (IsHoleyElementsKind(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(),
object->GetIsolate());
if (object->elements() ==
object->GetReadOnlyRoots().empty_fixed_array() ||
IsDoubleElementsKind(from_kind) == IsDoubleElementsKind(to_kind)) {
// No change is needed to the elements() buffer, the transition
// only requires a map change.
JSObject::MigrateToMap(object, to_map);
} else {
DCHECK(
(IsSmiElementsKind(from_kind) && IsDoubleElementsKind(to_kind)) ||
(IsDoubleElementsKind(from_kind) && IsObjectElementsKind(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(), object->GetIsolate()));
}
}
}
static void GrowCapacityAndConvertImpl(Handle<JSObject> object,
uint32_t capacity) {
ElementsKind from_kind = object->GetElementsKind();
if (IsSmiOrObjectElementsKind(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()->UpdateNoElementsProtectorOnSetLength(object);
}
Handle<FixedArrayBase> old_elements(object->elements(),
object->GetIsolate());
// This method should only be called if there's a reason to update the
// elements.
DCHECK(IsDoubleElementsKind(from_kind) != IsDoubleElementsKind(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(),
object->GetIsolate());
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(Isolate* isolate, FixedArrayBase* from,
uint32_t from_start, FixedArrayBase* to,
ElementsKind from_kind, uint32_t to_start,
int packed_size, int copy_size) {
UNREACHABLE();
}