134 lines
5.0 KiB
C++
134 lines
5.0 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/legal
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**
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** This file is part of the QtCore module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Digia. For licensing terms and
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** conditions see http://qt.digia.com/licensing. For further information
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** use the contact form at http://qt.digia.com/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Digia gives you certain additional
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** rights. These rights are described in the Digia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3.0 as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU General Public License version 3.0 requirements will be
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** met: http://www.gnu.org/copyleft/gpl.html.
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include <QtCore/qarraydata.h>
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#include <QtCore/private/qtools_p.h>
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#include <stdlib.h>
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QT_BEGIN_NAMESPACE
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#if defined (__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ >= 406) && !defined(Q_CC_INTEL)
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wmissing-field-initializers"
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#endif
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const QArrayData QArrayData::shared_null[2] = {
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{ Q_REFCOUNT_INITIALIZE_STATIC, 0, 0, 0, sizeof(QArrayData) }, // shared null
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/* zero initialized terminator */};
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static const QArrayData qt_array[3] = {
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{ Q_REFCOUNT_INITIALIZE_STATIC, 0, 0, 0, sizeof(QArrayData) }, // shared empty
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{ { Q_BASIC_ATOMIC_INITIALIZER(0) }, 0, 0, 0, sizeof(QArrayData) }, // unsharable empty
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/* zero initialized terminator */};
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#if defined (__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ >= 406) && !defined(Q_CC_INTEL)
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#pragma GCC diagnostic pop
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#endif
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static const QArrayData &qt_array_empty = qt_array[0];
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static const QArrayData &qt_array_unsharable_empty = qt_array[1];
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QArrayData *QArrayData::allocate(size_t objectSize, size_t alignment,
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size_t capacity, AllocationOptions options)
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{
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// Alignment is a power of two
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Q_ASSERT(alignment >= Q_ALIGNOF(QArrayData)
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&& !(alignment & (alignment - 1)));
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// Don't allocate empty headers
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if (!(options & RawData) && !capacity) {
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#if QT_SUPPORTS(UNSHARABLE_CONTAINERS)
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if (options & Unsharable)
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return const_cast<QArrayData *>(&qt_array_unsharable_empty);
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#endif
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return const_cast<QArrayData *>(&qt_array_empty);
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}
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size_t headerSize = sizeof(QArrayData);
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// Allocate extra (alignment - Q_ALIGNOF(QArrayData)) padding bytes so we
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// can properly align the data array. This assumes malloc is able to
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// provide appropriate alignment for the header -- as it should!
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// Padding is skipped when allocating a header for RawData.
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if (!(options & RawData))
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headerSize += (alignment - Q_ALIGNOF(QArrayData));
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// Allocate additional space if array is growing
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if (options & Grow)
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capacity = qAllocMore(int(objectSize * capacity), int(headerSize)) / int(objectSize);
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size_t allocSize = headerSize + objectSize * capacity;
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QArrayData *header = static_cast<QArrayData *>(::malloc(allocSize));
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if (header) {
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quintptr data = (quintptr(header) + sizeof(QArrayData) + alignment - 1)
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& ~(alignment - 1);
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header->ref.atomic.store(bool(!(options & Unsharable)));
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header->size = 0;
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header->alloc = capacity;
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header->capacityReserved = bool(options & CapacityReserved);
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header->offset = data - quintptr(header);
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}
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return header;
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}
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void QArrayData::deallocate(QArrayData *data, size_t objectSize,
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size_t alignment)
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{
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// Alignment is a power of two
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Q_ASSERT(alignment >= Q_ALIGNOF(QArrayData)
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&& !(alignment & (alignment - 1)));
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Q_UNUSED(objectSize) Q_UNUSED(alignment)
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#if QT_SUPPORTS(UNSHARABLE_CONTAINERS)
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if (data == &qt_array_unsharable_empty)
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return;
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#endif
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Q_ASSERT_X(!data->ref.isStatic(), "QArrayData::deallocate", "Static data can not be deleted");
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::free(data);
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}
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QT_END_NAMESPACE
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