9b2835e464
The q_status member has too much space dedicated to it: 32 bits. So we can shrink it to a mere 8 bits and move it up to the 1-byte padding hole and repurpose the space it used to use. This only works because the q_status member was not accessed by any inline function before Qt 6.8 (see commit fc23fa459c5924bf1cc4564c7bce1fd59d7c972b). After this, pahole says: class QScopedPointer<QDataStreamPrivate> d; /* 0 8 */ class QIODevice * dev; /* 8 8 */ bool owndev; /* 16 1 */ bool noswap; /* 17 1 */ quint8 fpPrecision; /* 18 1 */ quint8 q_status; /* 19 1 */ enum ByteOrder byteorder; /* 20 4 */ int ver; /* 24 4 */ quint16 transactionDepth; /* 28 2 */ /* size: 32, cachelines: 1, members: 10 */ That leaves 16 bits of tail padding unused, so reduces the maximum number of nested transactions to 65536. That is to support a Qt 7 layout in an upcoming commit. Change-Id: I50e2158aeade4256ad1dfffd17b29d75fd13f472 Reviewed-by: Marc Mutz <marc.mutz@qt.io> Reviewed-by: Ivan Solovev <ivan.solovev@qt.io> Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
33 lines
673 B
C++
33 lines
673 B
C++
// Copyright (C) 2016 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
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#ifndef QDATASTREAM_P_H
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#define QDATASTREAM_P_H
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//
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// W A R N I N G
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// -------------
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//
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// This file is not part of the Qt API. It exists purely as an
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// implementation detail. This header file may change from version to
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// version without notice, or even be removed.
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//
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// We mean it.
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//
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#include <QtCore/private/qglobal_p.h>
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#include <qdatastream.h>
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QT_BEGIN_NAMESPACE
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#if !defined(QT_NO_DATASTREAM) || defined(QT_BOOTSTRAPPED)
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class QDataStreamPrivate
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{
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public:
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};
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#endif
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QT_END_NAMESPACE
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#endif // QDATASTREAM_P_H
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