michael@0: /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
michael@0:  * vim: set ts=8 sts=4 et sw=4 tw=99:
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #ifndef vm_ArrayObject_h
michael@0: #define vm_ArrayObject_h
michael@0: 
michael@0: #include "jsobj.h"
michael@0: 
michael@0: namespace js {
michael@0: 
michael@0: class ArrayObject : public JSObject
michael@0: {
michael@0:   public:
michael@0:     // Array(x) eagerly allocates dense elements if x <= this value.
michael@0:     static const uint32_t EagerAllocationMaxLength = 2048;
michael@0: 
michael@0:     static const Class class_;
michael@0: 
michael@0:     bool lengthIsWritable() const {
michael@0:         return !getElementsHeader()->hasNonwritableArrayLength();
michael@0:     }
michael@0: 
michael@0:     uint32_t length() const {
michael@0:         return getElementsHeader()->length;
michael@0:     }
michael@0: 
michael@0:     inline void setLength(ExclusiveContext *cx, uint32_t length);
michael@0: 
michael@0:     // Variant of setLength for use on arrays where the length cannot overflow int32_t.
michael@0:     void setLengthInt32(uint32_t length) {
michael@0:         JS_ASSERT(lengthIsWritable());
michael@0:         JS_ASSERT(length <= INT32_MAX);
michael@0:         getElementsHeader()->length = length;
michael@0:     }
michael@0: };
michael@0: 
michael@0: } // namespace js
michael@0: 
michael@0: #endif // vm_ArrayObject_h
michael@0: