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78 lines
2.5 KiB
C++
78 lines
2.5 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: set ts=8 sts=4 et sw=4 tw=99:
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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_h
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#define vm_ArrayObject_h
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#include "vm/NativeObject.h"
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namespace js {
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class AutoSetNewObjectMetadata;
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class ArrayObject : public NativeObject
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{
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public:
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// Array(x) eagerly allocates dense elements if x <= this value. Without
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// the subtraction the max would roll over to the next power-of-two (4096)
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// due to the way that growElements() and goodAllocated() work.
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static const uint32_t EagerAllocationMaxLength = 2048 - ObjectElements::VALUES_PER_HEADER;
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static const Class class_;
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bool lengthIsWritable() const {
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return !getElementsHeader()->hasNonwritableArrayLength();
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}
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uint32_t length() const {
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return getElementsHeader()->length;
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}
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inline void setLength(ExclusiveContext* cx, uint32_t length);
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// Variant of setLength for use on arrays where the length cannot overflow int32_t.
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void setLengthInt32(uint32_t length) {
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MOZ_ASSERT(lengthIsWritable());
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MOZ_ASSERT(length <= INT32_MAX);
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getElementsHeader()->length = length;
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}
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// Make an array object with the specified initial state.
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static inline ArrayObject*
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createArray(ExclusiveContext* cx,
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gc::AllocKind kind,
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gc::InitialHeap heap,
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HandleShape shape,
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HandleObjectGroup group,
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uint32_t length,
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AutoSetNewObjectMetadata& metadata);
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// Make a copy-on-write array object which shares the elements of an
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// existing object.
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static inline ArrayObject*
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createCopyOnWriteArray(ExclusiveContext* cx,
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gc::InitialHeap heap,
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HandleArrayObject sharedElementsOwner);
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private:
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// Helper for the above methods.
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static inline ArrayObject*
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createArrayInternal(ExclusiveContext* cx,
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gc::AllocKind kind,
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gc::InitialHeap heap,
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HandleShape shape,
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HandleObjectGroup group,
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AutoSetNewObjectMetadata&);
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static inline ArrayObject*
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finishCreateArray(ArrayObject* obj, HandleShape shape, AutoSetNewObjectMetadata& metadata);
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};
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} // namespace js
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#endif // vm_ArrayObject_h
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