1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/js/src/vm/ArrayObject.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,43 @@
1.4 +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
1.5 + * vim: set ts=8 sts=4 et sw=4 tw=99:
1.6 + * This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#ifndef vm_ArrayObject_h
1.11 +#define vm_ArrayObject_h
1.12 +
1.13 +#include "jsobj.h"
1.14 +
1.15 +namespace js {
1.16 +
1.17 +class ArrayObject : public JSObject
1.18 +{
1.19 + public:
1.20 + // Array(x) eagerly allocates dense elements if x <= this value.
1.21 + static const uint32_t EagerAllocationMaxLength = 2048;
1.22 +
1.23 + static const Class class_;
1.24 +
1.25 + bool lengthIsWritable() const {
1.26 + return !getElementsHeader()->hasNonwritableArrayLength();
1.27 + }
1.28 +
1.29 + uint32_t length() const {
1.30 + return getElementsHeader()->length;
1.31 + }
1.32 +
1.33 + inline void setLength(ExclusiveContext *cx, uint32_t length);
1.34 +
1.35 + // Variant of setLength for use on arrays where the length cannot overflow int32_t.
1.36 + void setLengthInt32(uint32_t length) {
1.37 + JS_ASSERT(lengthIsWritable());
1.38 + JS_ASSERT(length <= INT32_MAX);
1.39 + getElementsHeader()->length = length;
1.40 + }
1.41 +};
1.42 +
1.43 +} // namespace js
1.44 +
1.45 +#endif // vm_ArrayObject_h
1.46 +
