121 lines
4.2 KiB
C++
121 lines
4.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef vm_ArrayObject_inl_h
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#define vm_ArrayObject_inl_h
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#include "vm/ArrayObject.h"
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#include "gc/GCTrace.h"
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#include "vm/String.h"
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#include "jsgcinlines.h"
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#include "jsobjinlines.h"
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#include "vm/TypeInference-inl.h"
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namespace js {
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inline void
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ArrayObject::setLength(ExclusiveContext* cx, uint32_t length)
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{
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MOZ_ASSERT(lengthIsWritable());
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MOZ_ASSERT_IF(length != getElementsHeader()->length, !denseElementsAreFrozen());
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if (length > INT32_MAX) {
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/* Track objects with overflowing lengths in type information. */
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MarkObjectGroupFlags(cx, this, OBJECT_FLAG_LENGTH_OVERFLOW);
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}
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getElementsHeader()->length = length;
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}
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/* static */ inline ArrayObject*
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ArrayObject::createArrayInternal(ExclusiveContext* cx, gc::AllocKind kind, gc::InitialHeap heap,
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HandleShape shape, HandleObjectGroup group,
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AutoSetNewObjectMetadata&)
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{
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// Create a new array and initialize everything except for its elements.
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MOZ_ASSERT(shape && group);
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MOZ_ASSERT(group->clasp() == shape->getObjectClass());
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MOZ_ASSERT(group->clasp() == &ArrayObject::class_);
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MOZ_ASSERT_IF(group->clasp()->hasFinalize(), heap == gc::TenuredHeap);
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MOZ_ASSERT_IF(group->hasUnanalyzedPreliminaryObjects(),
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heap == js::gc::TenuredHeap);
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MOZ_ASSERT(group->clasp()->shouldDelayMetadataBuilder());
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// Arrays can use their fixed slots to store elements, so can't have shapes
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// which allow named properties to be stored in the fixed slots.
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MOZ_ASSERT(shape->numFixedSlots() == 0);
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size_t nDynamicSlots = dynamicSlotsCount(0, shape->slotSpan(), group->clasp());
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JSObject* obj = Allocate<JSObject>(cx, kind, nDynamicSlots, heap, group->clasp());
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if (!obj)
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return nullptr;
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static_cast<ArrayObject*>(obj)->shape_.init(shape);
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static_cast<ArrayObject*>(obj)->group_.init(group);
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cx->compartment()->setObjectPendingMetadata(cx, obj);
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return &obj->as<ArrayObject>();
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}
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/* static */ inline ArrayObject*
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ArrayObject::finishCreateArray(ArrayObject* obj, HandleShape shape, AutoSetNewObjectMetadata& metadata)
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{
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size_t span = shape->slotSpan();
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if (span)
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obj->initializeSlotRange(0, span);
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gc::TraceCreateObject(obj);
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return obj;
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}
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/* static */ inline ArrayObject*
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ArrayObject::createArray(ExclusiveContext* cx, gc::AllocKind kind, gc::InitialHeap heap,
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HandleShape shape, HandleObjectGroup group,
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uint32_t length, AutoSetNewObjectMetadata& metadata)
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{
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ArrayObject* obj = createArrayInternal(cx, kind, heap, shape, group, metadata);
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if (!obj)
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return nullptr;
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uint32_t capacity = gc::GetGCKindSlots(kind) - ObjectElements::VALUES_PER_HEADER;
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obj->setFixedElements();
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new (obj->getElementsHeader()) ObjectElements(capacity, length);
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return finishCreateArray(obj, shape, metadata);
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}
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/* static */ inline ArrayObject*
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ArrayObject::createCopyOnWriteArray(ExclusiveContext* cx, gc::InitialHeap heap,
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HandleArrayObject sharedElementsOwner)
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{
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MOZ_ASSERT(sharedElementsOwner->getElementsHeader()->isCopyOnWrite());
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MOZ_ASSERT(sharedElementsOwner->getElementsHeader()->ownerObject() == sharedElementsOwner);
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// Use the smallest allocation kind for the array, as it can't have any
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// fixed slots (see the assert in createArrayInternal) and will not be using
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// its fixed elements.
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gc::AllocKind kind = gc::AllocKind::OBJECT0_BACKGROUND;
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AutoSetNewObjectMetadata metadata(cx);
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RootedShape shape(cx, sharedElementsOwner->lastProperty());
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RootedObjectGroup group(cx, sharedElementsOwner->group());
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ArrayObject* obj = createArrayInternal(cx, kind, heap, shape, group, metadata);
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if (!obj)
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return nullptr;
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obj->elements_ = sharedElementsOwner->getDenseElementsAllowCopyOnWrite();
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return finishCreateArray(obj, shape, metadata);
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}
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} // namespace js
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#endif // vm_ArrayObject_inl_h
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