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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=8 sts=2 et sw=2 tw=80:
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at */
#ifndef vm_ArrayObject_inl_h
#define vm_ArrayObject_inl_h
#include "vm/ArrayObject.h"
#include "gc/Allocator.h"
#include "gc/GCProbes.h"
#include "vm/StringType.h"
#include "vm/JSObject-inl.h"
#include "vm/ObjectOperations-inl.h" // js::GetElement
namespace js {
/* static */ inline ArrayObject* ArrayObject::createArrayInternal(
JSContext* cx, gc::AllocKind kind, gc::InitialHeap heap, HandleShape shape,
HandleObjectGroup group, AutoSetNewObjectMetadata&) {
const JSClass* clasp = group->clasp();
MOZ_ASSERT(shape && group);
MOZ_ASSERT(clasp == shape->getObjectClass());
MOZ_ASSERT(clasp == &ArrayObject::class_);
MOZ_ASSERT_IF(clasp->hasFinalize(), heap == gc::TenuredHeap);
// Arrays can use their fixed slots to store elements, so can't have shapes
// which allow named properties to be stored in the fixed slots.
MOZ_ASSERT(shape->numFixedSlots() == 0);
size_t nDynamicSlots = calculateDynamicSlots(0, shape->slotSpan(), clasp);
JSObject* obj = js::AllocateObject(cx, kind, nDynamicSlots, heap, clasp);
if (!obj) {
return nullptr;
ArrayObject* aobj = static_cast<ArrayObject*>(obj);
// NOTE: Dynamic slots are created internally by Allocate<JSObject>.
if (!nDynamicSlots) {
cx->realm()->setObjectPendingMetadata(cx, aobj);
return aobj;
/* static */ inline ArrayObject* ArrayObject::finishCreateArray(
ArrayObject* obj, HandleShape shape, AutoSetNewObjectMetadata& metadata) {
size_t span = shape->slotSpan();
if (span) {
obj->initializeSlotRange(0, span);
return obj;
/* static */ inline ArrayObject* ArrayObject::createArray(
JSContext* cx, gc::AllocKind kind, gc::InitialHeap heap, HandleShape shape,
HandleObjectGroup group, uint32_t length,
AutoSetNewObjectMetadata& metadata) {
ArrayObject* obj =
createArrayInternal(cx, kind, heap, shape, group, metadata);
if (!obj) {
return nullptr;
uint32_t capacity =
gc::GetGCKindSlots(kind) - ObjectElements::VALUES_PER_HEADER;
new (obj->getElementsHeader()) ObjectElements(capacity, length);
return finishCreateArray(obj, shape, metadata);
} // namespace js
#endif // vm_ArrayObject_inl_h