1 /**************************************************************************** 2 ** 3 ** Copyright (C) 2016 The Qt Company Ltd. 4 ** Copyright (C) 2016 Intel Corporation. 5 ** Contact: https://www.qt.io/licensing/ 6 ** 7 ** This file is part of the QtCore module of the Qt Toolkit. 8 ** 9 ** $QT_BEGIN_LICENSE:LGPL$ 10 ** Commercial License Usage 11 ** Licensees holding valid commercial Qt licenses may use this file in 12 ** accordance with the commercial license agreement provided with the 13 ** Software or, alternatively, in accordance with the terms contained in 14 ** a written agreement between you and The Qt Company. For licensing terms 15 ** and conditions see https://www.qt.io/terms-conditions. For further 16 ** information use the contact form at https://www.qt.io/contact-us. 17 ** 18 ** GNU Lesser General Public License Usage 19 ** Alternatively, this file may be used under the terms of the GNU Lesser 20 ** General Public License version 3 as published by the Free Software 21 ** Foundation and appearing in the file LICENSE.LGPL3 included in the 22 ** packaging of this file. Please review the following information to 23 ** ensure the GNU Lesser General Public License version 3 requirements 24 ** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. 25 ** 26 ** GNU General Public License Usage 27 ** Alternatively, this file may be used under the terms of the GNU 28 ** General Public License version 2.0 or (at your option) the GNU General 29 ** Public license version 3 or any later version approved by the KDE Free 30 ** Qt Foundation. The licenses are as published by the Free Software 31 ** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 32 ** included in the packaging of this file. Please review the following 33 ** information to ensure the GNU General Public License requirements will 34 ** be met: https://www.gnu.org/licenses/gpl-2.0.html and 35 ** https://www.gnu.org/licenses/gpl-3.0.html. 36 ** 37 ** $QT_END_LICENSE$ 38 ** 39 ****************************************************************************/ 40 41 #ifndef QLIBRARY_P_H 42 #define QLIBRARY_P_H 43 44 // 45 // W A R N I N G 46 // ------------- 47 // 48 // This file is not part of the Qt API. It exists for the convenience 49 // of the QLibrary class. This header file may change from 50 // version to version without notice, or even be removed. 51 // 52 // We mean it. 53 // 54 55 #include <QtCore/private/qglobal_p.h> 56 #include "QtCore/qlibrary.h" 57 #include "QtCore/qmutex.h" 58 #include "QtCore/qpointer.h" 59 #include "QtCore/qstringlist.h" 60 #include "QtCore/qplugin.h" 61 #ifdef Q_OS_WIN 62 # include "QtCore/qt_windows.h" 63 #endif 64 65 QT_REQUIRE_CONFIG(library); 66 67 QT_BEGIN_NAMESPACE 68 69 bool qt_debug_component(); 70 71 class QLibraryStore; 72 class QLibraryPrivate 73 { 74 public: 75 #ifdef Q_OS_WIN 76 using Handle = HINSTANCE; 77 #else 78 using Handle = void *; 79 #endif 80 enum UnloadFlag { UnloadSys, NoUnloadSys }; 81 82 const QString fileName; 83 const QString fullVersion; 84 85 bool load(); 86 QtPluginInstanceFunction loadPlugin(); // loads and resolves instance 87 bool unload(UnloadFlag flag = UnloadSys); 88 void release(); 89 QFunctionPointer resolve(const char *); 90 loadHints()91 QLibrary::LoadHints loadHints() const 92 { return QLibrary::LoadHints(loadHintsInt.loadRelaxed()); } 93 void setLoadHints(QLibrary::LoadHints lh); 94 QObject *pluginInstance(); 95 96 static QLibraryPrivate *findOrCreate(const QString &fileName, const QString &version = QString(), 97 QLibrary::LoadHints loadHints = { }); 98 static QStringList suffixes_sys(const QString &fullVersion); 99 static QStringList prefixes_sys(); 100 101 QAtomicPointer<std::remove_pointer<QtPluginInstanceFunction>::type> instanceFactory; 102 QAtomicPointer<std::remove_pointer<Handle>::type> pHnd; 103 104 // the mutex protects the fields below 105 QMutex mutex; 106 QPointer<QObject> inst; // used by QFactoryLoader 107 QJsonObject metaData; 108 QString errorString; 109 QString qualifiedFileName; 110 111 void updatePluginState(); 112 bool isPlugin(); 113 114 private: 115 explicit QLibraryPrivate(const QString &canonicalFileName, const QString &version, QLibrary::LoadHints loadHints); 116 ~QLibraryPrivate(); 117 void mergeLoadHints(QLibrary::LoadHints loadHints); 118 119 bool load_sys(); 120 bool unload_sys(); 121 QFunctionPointer resolve_sys(const char *); 122 123 QAtomicInt loadHintsInt; 124 125 /// counts how many QLibrary or QPluginLoader are attached to us, plus 1 if it's loaded 126 QAtomicInt libraryRefCount; 127 /// counts how many times load() or loadPlugin() were called 128 QAtomicInt libraryUnloadCount; 129 130 enum { IsAPlugin, IsNotAPlugin, MightBeAPlugin } pluginState; 131 friend class QLibraryStore; 132 }; 133 134 QT_END_NAMESPACE 135 136 #endif // QLIBRARY_P_H 137