| 1 | // Copyright (C) 2016 The Qt Company Ltd. |
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| 2 | // 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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| 3 | |
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| 4 | #ifndef QQMLVME_P_H |
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| 5 | #define QQMLVME_P_H |
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| 6 | |
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| 7 | // |
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| 8 | // W A R N I N G |
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| 9 | // ------------- |
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| 10 | // |
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| 11 | // This file is not part of the Qt API. It exists purely as an |
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| 12 | // implementation detail. This header file may change from version to |
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| 13 | // version without notice, or even be removed. |
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| 14 | // |
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| 15 | // We mean it. |
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| 16 | // |
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| 17 | |
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| 18 | #include <private/qrecursionwatcher_p.h> |
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| 19 | |
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| 20 | #include <QtCore/QStack> |
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| 21 | #include <QtCore/QString> |
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| 22 | #include <QtCore/qelapsedtimer.h> |
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| 23 | #include <QtCore/qdeadlinetimer.h> |
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| 24 | #include <QtCore/qcoreapplication.h> |
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| 25 | #include <QtCore/qtypeinfo.h> |
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| 26 | |
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| 27 | #include <private/qqmlengine_p.h> |
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| 28 | #include <private/qfinitestack_p.h> |
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| 29 | |
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| 30 | #include <atomic> |
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| 31 | |
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| 32 | QT_BEGIN_NAMESPACE |
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| 33 | |
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| 34 | class QObject; |
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| 35 | |
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| 36 | class QQmlInstantiationInterrupt { |
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| 37 | public: |
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| 38 | inline QQmlInstantiationInterrupt(); |
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| 39 | inline QQmlInstantiationInterrupt(std::atomic<bool> *runWhile, |
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| 40 | QDeadlineTimer deadline = QDeadlineTimer::Forever); |
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| 41 | inline QQmlInstantiationInterrupt(QDeadlineTimer deadline); |
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| 42 | |
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| 43 | inline bool shouldInterrupt() const; |
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| 44 | private: |
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| 45 | enum Mode { None, Time, Flag }; |
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| 46 | Mode mode; |
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| 47 | QDeadlineTimer deadline; |
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| 48 | std::atomic<bool> *runWhile = nullptr; |
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| 49 | }; |
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| 50 | |
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| 51 | class Q_QML_PRIVATE_EXPORT QQmlVME |
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| 52 | { |
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| 53 | public: |
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| 54 | static void enableComponentComplete(); |
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| 55 | static void disableComponentComplete(); |
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| 56 | static bool componentCompleteEnabled(); |
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| 57 | |
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| 58 | private: |
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| 59 | static bool s_enableComponentComplete; |
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| 60 | }; |
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| 61 | |
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| 62 | // Used to check that a QQmlVME that is interrupted mid-execution |
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| 63 | // is still valid. Checks all the objects and contexts have not been |
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| 64 | // deleted. |
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| 65 | // |
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| 66 | // VME stands for Virtual Machine Execution. QML files used to |
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| 67 | // be compiled to a byte code data structure that a virtual machine executed |
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| 68 | // (for constructing the tree of QObjects and setting properties). |
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| 69 | class QQmlVMEGuard |
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| 70 | { |
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| 71 | public: |
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| 72 | QQmlVMEGuard(); |
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| 73 | ~QQmlVMEGuard(); |
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| 74 | |
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| 75 | void guard(QQmlObjectCreator *); |
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| 76 | void clear(); |
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| 77 | |
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| 78 | bool isOK() const; |
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| 79 | |
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| 80 | private: |
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| 81 | int m_objectCount; |
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| 82 | QQmlGuard<QObject> *m_objects; |
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| 83 | int m_contextCount; |
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| 84 | QQmlGuardedContextData *m_contexts; |
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| 85 | }; |
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| 86 | |
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| 87 | QQmlInstantiationInterrupt::QQmlInstantiationInterrupt() |
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| 88 | : mode(None) |
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| 89 | { |
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| 90 | } |
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| 91 | |
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| 92 | QQmlInstantiationInterrupt::QQmlInstantiationInterrupt(std::atomic<bool> *runWhile, QDeadlineTimer deadline) |
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| 93 | : mode(Flag), deadline(deadline), runWhile(runWhile) |
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| 94 | { |
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| 95 | } |
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| 96 | |
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| 97 | QQmlInstantiationInterrupt::QQmlInstantiationInterrupt(QDeadlineTimer deadline) |
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| 98 | : mode(Time), deadline(deadline) |
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| 99 | { |
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| 100 | } |
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| 101 | |
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| 102 | bool QQmlInstantiationInterrupt::shouldInterrupt() const |
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| 103 | { |
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| 104 | switch (mode) { |
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| 105 | case None: |
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| 106 | return false; |
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| 107 | case Time: |
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| 108 | return deadline.hasExpired(); |
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| 109 | case Flag: |
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| 110 | return !runWhile->load(m: std::memory_order_acquire) || deadline.hasExpired(); |
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| 111 | } |
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| 112 | Q_UNREACHABLE_RETURN(false); |
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| 113 | } |
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| 114 | |
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| 115 | QT_END_NAMESPACE |
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| 116 | |
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| 117 | #endif // QQMLVME_P_H |
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| 118 | |
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