| /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- |
| * vim: set ts=8 sts=4 et sw=4 tw=99: |
| * 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 http://mozilla.org/MPL/2.0/. */ |
| |
| #ifndef vm_ArrayObject_inl_h |
| #define vm_ArrayObject_inl_h |
| |
| #include "vm/ArrayObject.h" |
| |
| #include "gc/GCTrace.h" |
| #include "vm/String.h" |
| |
| #include "jsgcinlines.h" |
| #include "jsobjinlines.h" |
| |
| #include "vm/TypeInference-inl.h" |
| |
| namespace js { |
| |
| inline void |
| ArrayObject::setLength(ExclusiveContext* cx, uint32_t length) |
| { |
| MOZ_ASSERT(lengthIsWritable()); |
| |
| if (length > INT32_MAX) { |
| /* Track objects with overflowing lengths in type information. */ |
| MarkObjectGroupFlags(cx, this, OBJECT_FLAG_LENGTH_OVERFLOW); |
| } |
| |
| getElementsHeader()->length = length; |
| } |
| |
| /* static */ inline ArrayObject* |
| ArrayObject::createArrayInternal(ExclusiveContext* cx, gc::AllocKind kind, gc::InitialHeap heap, |
| HandleShape shape, HandleObjectGroup group, |
| AutoSetNewObjectMetadata&) |
| { |
| // Create a new array and initialize everything except for its elements. |
| MOZ_ASSERT(shape && group); |
| MOZ_ASSERT(group->clasp() == shape->getObjectClass()); |
| MOZ_ASSERT(group->clasp() == &ArrayObject::class_); |
| MOZ_ASSERT_IF(group->clasp()->finalize, heap == gc::TenuredHeap); |
| MOZ_ASSERT_IF(group->hasUnanalyzedPreliminaryObjects(), |
| heap == js::gc::TenuredHeap); |
| MOZ_ASSERT(group->clasp()->shouldDelayMetadataCallback()); |
| |
| // 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 = dynamicSlotsCount(0, shape->slotSpan(), group->clasp()); |
| JSObject* obj = Allocate<JSObject>(cx, kind, nDynamicSlots, heap, group->clasp()); |
| if (!obj) |
| return nullptr; |
| |
| static_cast<ArrayObject*>(obj)->shape_.init(shape); |
| static_cast<ArrayObject*>(obj)->group_.init(group); |
| |
| cx->compartment()->setObjectPendingMetadata(cx, obj); |
| return &obj->as<ArrayObject>(); |
| } |
| |
| /* static */ inline ArrayObject* |
| ArrayObject::finishCreateArray(ArrayObject* obj, HandleShape shape, AutoSetNewObjectMetadata& metadata) |
| { |
| size_t span = shape->slotSpan(); |
| if (span) |
| obj->initializeSlotRange(0, span); |
| |
| gc::TraceCreateObject(obj); |
| |
| return obj; |
| } |
| |
| /* static */ inline ArrayObject* |
| ArrayObject::createArray(ExclusiveContext* 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; |
| |
| obj->setFixedElements(); |
| new (obj->getElementsHeader()) ObjectElements(capacity, length); |
| |
| return finishCreateArray(obj, shape, metadata); |
| } |
| |
| /* static */ inline ArrayObject* |
| ArrayObject::createCopyOnWriteArray(ExclusiveContext* cx, gc::InitialHeap heap, |
| HandleArrayObject sharedElementsOwner) |
| { |
| MOZ_ASSERT(sharedElementsOwner->getElementsHeader()->isCopyOnWrite()); |
| MOZ_ASSERT(sharedElementsOwner->getElementsHeader()->ownerObject() == sharedElementsOwner); |
| |
| // Use the smallest allocation kind for the array, as it can't have any |
| // fixed slots (see the assert in createArrayInternal) and will not be using |
| // its fixed elements. |
| gc::AllocKind kind = gc::AllocKind::OBJECT0_BACKGROUND; |
| |
| AutoSetNewObjectMetadata metadata(cx); |
| RootedShape shape(cx, sharedElementsOwner->lastProperty()); |
| RootedObjectGroup group(cx, sharedElementsOwner->group()); |
| ArrayObject* obj = createArrayInternal(cx, kind, heap, shape, group, metadata); |
| if (!obj) |
| return nullptr; |
| |
| obj->elements_ = sharedElementsOwner->getDenseElementsAllowCopyOnWrite(); |
| |
| return finishCreateArray(obj, shape, metadata); |
| } |
| |
| } // namespace js |
| |
| #endif // vm_ArrayObject_inl_h |