qqmlprofiler_p.h

Go to the documentation of this file.

// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
// Qt-Security score:significant
 
#ifndef QQMLPROFILER_P_H
#define QQMLPROFILER_P_H
 
//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
 
#include <private/qqmlbinding_p.h>
#include <private/qqmlboundsignal_p.h>
#include <private/qqmlglobal_p.h>
#include <private/qv4function_p.h>
 
#if QT_CONFIG(qml_debug)
#include "qqmlprofilerdefinitions_p.h"
#endif
 
#include <QtCore/qurl.h>
#include <QtCore/qstring.h>
 
QT_BEGIN_NAMESPACE
 
#if !QT_CONFIG(qml_debug)
 
#define Q_QML_PROFILE_IF_ENABLED(feature, profiler, Code)
#define Q_QML_PROFILE(feature, profiler, Method)
#define Q_QML_OC_PROFILE(member, Code)
 
class QQmlProfiler {};
 
struct QQmlBindingProfiler
{
    QQmlBindingProfiler(quintptr, QV4::Function *) {}
};
 
struct QQmlHandlingSignalProfiler
{
    QQmlHandlingSignalProfiler(quintptr, QQmlBoundSignalExpression *) {}
};
 
struct QQmlCompilingProfiler
{
    QQmlCompilingProfiler(quintptr, QQmlDataBlob *) {}
};
 
struct QQmlVmeProfiler {
    QQmlVmeProfiler() {}
 
    void init(quintptr, int) {}
 
    const QV4::CompiledData::Object *pop() { return nullptr; }
    void push(const QV4::CompiledData::Object *) {}
 
    static const quintptr profiler = 0;
};
 
struct QQmlObjectCreationProfiler
{
    QQmlObjectCreationProfiler(quintptr, const QV4::CompiledData::Object *) {}
    void update(QV4::CompiledData::CompilationUnit *, const QV4::CompiledData::Object *,
                const QString &, const QUrl &) {}
};
 
struct QQmlObjectCompletionProfiler
{
    QQmlObjectCompletionProfiler(QQmlVmeProfiler *) {}
};
 
#else
 
#define Q_QML_PROFILE_IF_ENABLED(feature, profiler, Code)
    if (profiler && (profiler->featuresEnabled & (1 << feature))) {
        Code;
    } else
        (void)0
 
#define Q_QML_PROFILE(feature, profiler, Method)
    Q_QML_PROFILE_IF_ENABLED(feature, profiler, profiler->Method)
 
#define Q_QML_OC_PROFILE(member, Code)
    Q_QML_PROFILE_IF_ENABLED(QQmlProfilerDefinitions::ProfileCreating, member.profiler, Code)
 
// This struct is somewhat dangerous to use:
// The messageType is a bit field. You can pack multiple messages into
// one object, e.g. RangeStart and RangeLocation. Each one will be read
// independently when converting to QByteArrays. Thus you can only pack
// messages if their data doesn't overlap. It's up to you to figure that
// out.
struct Q_AUTOTEST_EXPORT QQmlProfilerData : public QQmlProfilerDefinitions
{
    QQmlProfilerData(qint64 time = -1, int messageType = -1,
                     RangeType detailType = MaximumRangeType, quintptr locationId = 0) :
        time(time), locationId(locationId), messageType(messageType), detailType(detailType)
    {}
 
    qint64 time;
    quintptr locationId;
 
    int messageType;        //bit field of QQmlProfilerService::Message
    RangeType detailType;
};
 
Q_DECLARE_TYPEINFO(QQmlProfilerData, Q_RELOCATABLE_TYPE);
 
class Q_QML_EXPORT QQmlProfiler : public QObject, public QQmlProfilerDefinitions {
    Q_OBJECT
public:
 
    struct Location {
        Location(const QQmlSourceLocation &location = QQmlSourceLocation(),
                 const QUrl &url = QUrl()) :
            location(location), url(url) {}
        QQmlSourceLocation location;
        QUrl url;
    };
 
    // Unfortunately we have to resolve the locations right away because the QML context might not
    // be available anymore when we send the data.
    struct RefLocation : public Location {
        RefLocation()
            : Location(), locationType(MaximumRangeType), something(nullptr), sent(false)
        {
        }
 
        RefLocation(QV4::Function *ref)
            : Location(ref->sourceLocation()), locationType(Binding), sent(false)
        {
            function = ref;
            function->executableCompilationUnit()->addref();
        }
 
        RefLocation(QV4::ExecutableCompilationUnit *ref, const QUrl &url,
                    const QV4::CompiledData::Object *obj, const QString &type)
            : Location(QQmlSourceLocation(type, obj->location.line(), obj->location.column()), url),
              locationType(Creating), sent(false)
        {
            unit = ref;
            unit->addref();
        }
 
        RefLocation(QQmlBoundSignalExpression *ref)
            : Location(ref->sourceLocation()), locationType(HandlingSignal), sent(false)
        {
            boundSignal = ref;
            boundSignal->addref();
        }
 
        RefLocation(QQmlDataBlob *ref)
            : Location(QQmlSourceLocation(), ref->url()), locationType(Compiling), sent(false)
        {
            blob = ref;
            blob->addref();
        }
 
        RefLocation(const RefLocation &other)
            : Location(other),
              locationType(other.locationType),
              function(other.function),
              sent(other.sent)
        {
            addref();
        }
 
        RefLocation &operator=(const RefLocation &other)
        {
            if (this != &other) {
                release();
                Location::operator=(other);
                locationType = other.locationType;
                function = other.function;
                sent = other.sent;
                addref();
            }
            return *this;
        }
 
        ~RefLocation()
        {
            release();
        }
 
        void addref()
        {
            if (isNull())
                return;
 
            switch (locationType) {
            case Binding:
                function->executableCompilationUnit()->addref();
                break;
            case Creating:
                unit->addref();
                break;
            case HandlingSignal:
                boundSignal->addref();
                break;
            case Compiling:
                blob->addref();
                break;
            default:
                Q_ASSERT(locationType == MaximumRangeType);
                break;
            }
        }
 
        void release()
        {
            if (isNull())
                return;
 
            switch (locationType) {
            case Binding:
                function->executableCompilationUnit()->release();
                break;
            case Creating:
                unit->release();
                break;
            case HandlingSignal:
                boundSignal->release();
                break;
            case Compiling:
                blob->release();
                break;
            default:
                Q_ASSERT(locationType == MaximumRangeType);
                break;
            }
        }
 
        bool isValid() const
        {
            return locationType != MaximumRangeType;
        }
 
        bool isNull() const
        {
            return !something;
        }
 
        RangeType locationType;
        union {
            QV4::Function *function;
            QV4::ExecutableCompilationUnit *unit;
            QQmlBoundSignalExpression *boundSignal;
            QQmlDataBlob *blob;
            void *something;
        };
        bool sent;
    };
 
    typedef QHash<quintptr, Location> LocationHash;
 
    void startBinding(QV4::Function *function)
    {
        // Use the QV4::Function as ID, as that is common among different instances of the same
        // component. QQmlBinding is per instance.
        // Add 1 to the ID, to make it different from the IDs the V4 and signal handling profilers
        // produce. The +1 makes the pointer point into the middle of the QV4::Function. Thus it
        // still points to valid memory but we cannot accidentally create a duplicate key from
        // another object.
        // If there is no function, use a static but valid address: The profiler itself.
        quintptr locationId = function ? id(function) + 1 : id(this);
        m_data.append(QQmlProfilerData(m_timer.nsecsElapsed(),
                                       (1 << RangeStart | 1 << RangeLocation), Binding,
                                       locationId));
 
        RefLocation &location = m_locations[locationId];
        if (!location.isValid()) {
            if (function)
                location = RefLocation(function);
            else // Make it valid without actually providing a location
                location.locationType = Binding;
        }
    }
 
    // Have toByteArrays() construct another RangeData event from the same QString later.
    // This is somewhat pointless but important for backwards compatibility.
    void startCompiling(QQmlDataBlob *blob)
    {
        quintptr locationId(id(blob));
        m_data.append(QQmlProfilerData(m_timer.nsecsElapsed(),
                                       (1 << RangeStart | 1 << RangeLocation | 1 << RangeData),
                                       Compiling, locationId));
 
        RefLocation &location = m_locations[locationId];
        if (!location.isValid())
            location = RefLocation(blob);
    }
 
    void startHandlingSignal(QQmlBoundSignalExpression *expression)
    {
        // Use the QV4::Function as ID, as that is common among different instances of the same
        // component. QQmlBoundSignalExpression is per instance.
        // Add 2 to the ID, to make it different from the IDs the V4 and binding profilers produce.
        // The +2 makes the pointer point into the middle of the QV4::Function. Thus it still points
        // to valid memory but we cannot accidentally create a duplicate key from another object.
        quintptr locationId(id(expression->function()) + 2);
        m_data.append(QQmlProfilerData(m_timer.nsecsElapsed(),
                                       (1 << RangeStart | 1 << RangeLocation), HandlingSignal,
                                       locationId));
 
        RefLocation &location = m_locations[locationId];
        if (!location.isValid())
            location = RefLocation(expression);
    }
 
    void startCreating(const QV4::CompiledData::Object *obj)
    {
        m_data.append(QQmlProfilerData(m_timer.nsecsElapsed(),
                                       (1 << RangeStart | 1 << RangeLocation | 1 << RangeData),
                                       Creating, id(obj)));
    }
 
    void updateCreating(const QV4::CompiledData::Object *obj,
                        QV4::ExecutableCompilationUnit *ref,
                        const QUrl &url, const QString &type)
    {
        quintptr locationId(id(obj));
        RefLocation &location = m_locations[locationId];
        if (!location.isValid())
            location = RefLocation(ref, url, obj, type);
    }
 
    template<RangeType Range>
    void endRange()
    {
        m_data.append(QQmlProfilerData(m_timer.nsecsElapsed(), 1 << RangeEnd, Range));
    }
 
    QQmlProfiler();
 
    quint64 featuresEnabled;
 
    template<typename Object>
    static quintptr id(const Object *pointer)
    {
        return reinterpret_cast<quintptr>(pointer);
    }
 
    void startProfiling(quint64 features);
    void stopProfiling();
    void reportData();
    void setTimer(const QElapsedTimer &timer) { m_timer = timer; }
 
Q_SIGNALS:
    void dataReady(const QList<QQmlProfilerData> &, const QQmlProfiler::LocationHash &);
 
protected:
    QElapsedTimer m_timer;
    QHash<quintptr, RefLocation> m_locations;
    QList<QQmlProfilerData> m_data;
};
 
//
// RAII helper structs
//
 
struct QQmlProfilerHelper : public QQmlProfilerDefinitions {
    QQmlProfiler *profiler;
    QQmlProfilerHelper(QQmlProfiler *profiler) : profiler(profiler) {}
};
 
struct QQmlBindingProfiler : public QQmlProfilerHelper {
    QQmlBindingProfiler(QQmlProfiler *profiler, QV4::Function *function) :
        QQmlProfilerHelper(profiler)
    {
        Q_QML_PROFILE(QQmlProfilerDefinitions::ProfileBinding, profiler,
                      startBinding(function));
    }
 
    ~QQmlBindingProfiler()
    {
        Q_QML_PROFILE(QQmlProfilerDefinitions::ProfileBinding, profiler,
                      endRange<Binding>());
    }
};
 
struct QQmlHandlingSignalProfiler : public QQmlProfilerHelper {
    QQmlHandlingSignalProfiler(QQmlProfiler *profiler, QQmlBoundSignalExpression *expression) :
        QQmlProfilerHelper(profiler)
    {
        Q_QML_PROFILE(QQmlProfilerDefinitions::ProfileHandlingSignal, profiler,
                      startHandlingSignal(expression));
    }
 
    ~QQmlHandlingSignalProfiler()
    {
        Q_QML_PROFILE(QQmlProfilerDefinitions::ProfileHandlingSignal, profiler,
                      endRange<QQmlProfiler::HandlingSignal>());
    }
};
 
struct QQmlCompilingProfiler : public QQmlProfilerHelper {
    QQmlCompilingProfiler(QQmlProfiler *profiler, QQmlDataBlob *blob) :
        QQmlProfilerHelper(profiler)
    {
        Q_QML_PROFILE(QQmlProfilerDefinitions::ProfileCompiling, profiler, startCompiling(blob));
    }
 
    ~QQmlCompilingProfiler()
    {
        Q_QML_PROFILE(QQmlProfilerDefinitions::ProfileCompiling, profiler, endRange<Compiling>());
    }
};
 
struct QQmlVmeProfiler : public QQmlProfilerDefinitions {
public:
 
    QQmlVmeProfiler() : profiler(nullptr) {}
 
    void init(QQmlProfiler *p)
    {
        profiler = p;
    }
 
    const QV4::CompiledData::Object *pop()
    {
        if (ranges.size() > 0) {
            const auto *result = ranges.back();
            ranges.pop_back();
            return result;
        }
        return nullptr;
    }
 
    void push(const QV4::CompiledData::Object *object)
    {
        ranges.push_back(object);
    }
 
    QQmlProfiler *profiler;
 
private:
    std::vector<const QV4::CompiledData::Object *> ranges;
};
 
class QQmlObjectCreationProfiler {
public:
 
    QQmlObjectCreationProfiler(QQmlProfiler *profiler, const QV4::CompiledData::Object *obj)
        : profiler(profiler)
    {
        Q_QML_PROFILE(QQmlProfilerDefinitions::ProfileCreating, profiler, startCreating(obj));
    }
 
    ~QQmlObjectCreationProfiler()
    {
        Q_QML_PROFILE(QQmlProfilerDefinitions::ProfileCreating, profiler, endRange<QQmlProfilerDefinitions::Creating>());
    }
 
    void update(QV4::ExecutableCompilationUnit *ref, const QV4::CompiledData::Object *obj,
                const QString &typeName, const QUrl &url)
    {
        profiler->updateCreating(obj, ref, url, typeName);
    }
 
private:
    QQmlProfiler *profiler;
};
 
class QQmlObjectCompletionProfiler {
public:
    QQmlObjectCompletionProfiler(QQmlVmeProfiler *parent) :
        profiler(parent->profiler)
    {
        Q_QML_PROFILE_IF_ENABLED(QQmlProfilerDefinitions::ProfileCreating, profiler, {
            profiler->startCreating(parent->pop());
        });
    }
 
    ~QQmlObjectCompletionProfiler()
    {
        Q_QML_PROFILE(QQmlProfilerDefinitions::ProfileCreating, profiler,
                      endRange<QQmlProfilerDefinitions::Creating>());
    }
private:
    QQmlProfiler *profiler;
};
 
#endif // QT_CONFIG(qml_debug)
 
QT_END_NAMESPACE
 
#if QT_CONFIG(qml_debug)
 
Q_DECLARE_METATYPE(QList<QQmlProfilerData>)
Q_DECLARE_METATYPE(QQmlProfiler::LocationHash)
 
#endif // QT_CONFIG(qml_debug)
 
#endif // QQMLPROFILER_P_H