1 | // Copyright (C) 2019 The Qt Company Ltd. |
2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only |
3 | |
4 | #ifndef QQMLTYPEMODULE_P_H |
5 | #define QQMLTYPEMODULE_P_H |
6 | |
7 | // |
8 | // W A R N I N G |
9 | // ------------- |
10 | // |
11 | // This file is not part of the Qt API. It exists purely as an |
12 | // implementation detail. This header file may change from version to |
13 | // version without notice, or even be removed. |
14 | // |
15 | // We mean it. |
16 | // |
17 | |
18 | #include <QtQml/qtqmlglobal.h> |
19 | #include <QtQml/private/qstringhash_p.h> |
20 | #include <QtQml/private/qqmltype_p.h> |
21 | #include <QtCore/qmutex.h> |
22 | #include <QtCore/qstring.h> |
23 | #include <QtCore/qversionnumber.h> |
24 | |
25 | #include <functional> |
26 | |
27 | QT_BEGIN_NAMESPACE |
28 | |
29 | class QQmlType; |
30 | class QQmlTypePrivate; |
31 | struct QQmlMetaTypeData; |
32 | |
33 | namespace QV4 { |
34 | struct String; |
35 | } |
36 | |
37 | class QQmlTypeModule |
38 | { |
39 | public: |
40 | enum class LockLevel { |
41 | Open = 0, |
42 | Weak = 1, |
43 | Strong = 2 |
44 | }; |
45 | |
46 | QQmlTypeModule() = default; |
47 | QQmlTypeModule(const QString &uri, quint8 majorVersion) |
48 | : m_module(uri), m_majorVersion(majorVersion) |
49 | {} |
50 | |
51 | void add(QQmlTypePrivate *); |
52 | void remove(const QQmlTypePrivate *type); |
53 | |
54 | LockLevel lockLevel() const { return LockLevel(m_lockLevel.loadRelaxed()); } |
55 | bool setLockLevel(LockLevel mode) |
56 | { |
57 | while (true) { |
58 | const int currentLock = m_lockLevel.loadAcquire(); |
59 | if (currentLock > int(mode)) |
60 | return false; |
61 | if (currentLock == int(mode) || m_lockLevel.testAndSetRelease(expectedValue: currentLock, newValue: int(mode))) |
62 | return true; |
63 | } |
64 | } |
65 | |
66 | QString module() const |
67 | { |
68 | // No need to lock. m_module is const |
69 | return m_module; |
70 | } |
71 | |
72 | quint8 majorVersion() const |
73 | { |
74 | // No need to lock. d->majorVersion is const |
75 | return m_majorVersion; |
76 | } |
77 | |
78 | void addMinorVersion(quint8 minorVersion); |
79 | quint8 minimumMinorVersion() const { return m_minMinorVersion.loadRelaxed(); } |
80 | quint8 maximumMinorVersion() const { return m_maxMinorVersion.loadRelaxed(); } |
81 | |
82 | QQmlType type(const QHashedStringRef &name, QTypeRevision version) const |
83 | { |
84 | QMutexLocker lock(&m_mutex); |
85 | return findType(types: m_typeHash.value(key: name), version); |
86 | } |
87 | |
88 | QQmlType type(const QV4::String *name, QTypeRevision version) const |
89 | { |
90 | QMutexLocker lock(&m_mutex); |
91 | return findType(types: m_typeHash.value(string: name), version); |
92 | } |
93 | |
94 | void walkCompositeSingletons(const std::function<void(const QQmlType &)> &callback) const; |
95 | |
96 | private: |
97 | static Q_QML_PRIVATE_EXPORT QQmlType findType( |
98 | const QList<QQmlTypePrivate *> *types, QTypeRevision version); |
99 | |
100 | const QString m_module; |
101 | const quint8 m_majorVersion = 0; |
102 | |
103 | // Can only ever decrease |
104 | QAtomicInt m_minMinorVersion = std::numeric_limits<quint8>::max(); |
105 | |
106 | // Can only ever increase |
107 | QAtomicInt m_maxMinorVersion = 0; |
108 | |
109 | // LockLevel. Can only be increased. |
110 | QAtomicInt m_lockLevel = int(LockLevel::Open); |
111 | |
112 | using TypeHash = QStringHash<QList<QQmlTypePrivate *>>; |
113 | TypeHash m_typeHash; |
114 | |
115 | mutable QMutex m_mutex; |
116 | }; |
117 | |
118 | QT_END_NAMESPACE |
119 | |
120 | #endif // QQMLTYPEMODULE_P_H |
121 | |