1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
|
/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QtCore/qarraydata.h>
QT_BEGIN_NAMESPACE
const QArrayData QArrayData::shared_null = { Q_REFCOUNT_INITIALIZE_STATIC, 0, 0, 0, 0 };
static const QArrayData qt_array_empty = { Q_REFCOUNT_INITIALIZE_STATIC, 0, 0, 0, 0 };
static const QArrayData qt_array_unsharable_empty = { { Q_BASIC_ATOMIC_INITIALIZER(0) }, 0, 0, 0, 0 };
QArrayData *QArrayData::allocate(size_t objectSize, size_t alignment,
size_t capacity, AllocateOptions options)
{
// Alignment is a power of two
Q_ASSERT(alignment >= Q_ALIGNOF(QArrayData)
&& !(alignment & (alignment - 1)));
// Don't allocate empty headers
if (!capacity)
return !(options & Unsharable)
? const_cast<QArrayData *>(&qt_array_empty)
: const_cast<QArrayData *>(&qt_array_unsharable_empty);
// Allocate extra (alignment - Q_ALIGNOF(QArrayData)) padding bytes so we
// can properly align the data array. This assumes malloc is able to
// provide appropriate alignment for the header -- as it should!
size_t allocSize = sizeof(QArrayData) + objectSize * capacity
+ (alignment - Q_ALIGNOF(QArrayData));
QArrayData *header = static_cast<QArrayData *>(qMalloc(allocSize));
Q_CHECK_PTR(header);
if (header) {
quintptr data = (quintptr(header) + sizeof(QArrayData) + alignment - 1)
& ~(alignment - 1);
header->ref.atomic.store(bool(!(options & Unsharable)));
header->size = 0;
header->alloc = capacity;
header->capacityReserved = bool(options & CapacityReserved);
header->offset = data - quintptr(header);
}
return header;
}
void QArrayData::deallocate(QArrayData *data, size_t objectSize,
size_t alignment)
{
// Alignment is a power of two
Q_ASSERT(alignment >= Q_ALIGNOF(QArrayData)
&& !(alignment & (alignment - 1)));
Q_UNUSED(objectSize) Q_UNUSED(alignment)
if (data == &qt_array_unsharable_empty)
return;
qFree(data);
}
QT_END_NAMESPACE
|
