qt-creator/src/plugins/qmlprofiler/qmlprofilertracefile.cpp

// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0+ OR GPL-3.0 WITH Qt-GPL-exception-1.0

#include "qmlprofilertracefile.h"
#include "qmlprofilernotesmodel.h"
#include "qmlprofilerconstants.h"

#include <utils/qtcassert.h>

#include <QIODevice>
#include <QStringList>
#include <QXmlStreamReader>
#include <QXmlStreamWriter>
#include <QStack>
#include <QDebug>
#include <QFile>
#include <QBuffer>
#include <QDataStream>

namespace QmlProfiler {
namespace Internal {

const char PROFILER_FILE_VERSION[] = "1.02";

static const char *RANGE_TYPE_STRINGS[] = {
    "Painting",
    "Compiling",
    "Creating",
    "Binding",
    "HandlingSignal",
    "Javascript"
};

Q_STATIC_ASSERT(sizeof(RANGE_TYPE_STRINGS) == MaximumRangeType * sizeof(const char *));

static const char *MESSAGE_STRINGS[] = {
    // So far only pixmap and scenegraph are used. The others are padding.
    "Event",
    "RangeStart",
    "RangeData",
    "RangeLocation",
    "RangeEnd",
    "Complete",
    "PixmapCache",
    "SceneGraph",
    "MemoryAllocation",
    "DebugMessage",
    "Quick3D"
};

Q_STATIC_ASSERT(sizeof(MESSAGE_STRINGS) == MaximumMessage * sizeof(const char *));

#define _(X) QLatin1String(X)

//
// "be strict in your output but tolerant in your inputs"
//

static QPair<Message, RangeType> qmlTypeAsEnum(const QString &typeString)
{
    QPair<Message, RangeType> ret(MaximumMessage, MaximumRangeType);

    for (int i = 0; i < MaximumMessage; ++i) {
        if (typeString == _(MESSAGE_STRINGS[i])) {
            ret.first = static_cast<Message>(i);
            break;
        }
    }

    for (int i = 0; i < MaximumRangeType; ++i) {
        if (typeString == _(RANGE_TYPE_STRINGS[i])) {
            ret.second = static_cast<RangeType>(i);
            break;
        }
    }

    if (ret.first == MaximumMessage && ret.second == MaximumRangeType) {
        bool isNumber = false;
        int type = typeString.toUInt(&isNumber);
        if (isNumber && type < MaximumRangeType)
            // Allow saving ranges as numbers, but not messages.
            ret.second = static_cast<RangeType>(type);
    }

    return ret;
}

static QString qmlTypeAsString(Message message, RangeType rangeType)
{
    if (rangeType < MaximumRangeType)
        return _(RANGE_TYPE_STRINGS[rangeType]);
    else if (message < MaximumMessage)
        return _(MESSAGE_STRINGS[message]);
    else
        return QString::number((int)rangeType);
}

QmlProfilerTraceFile::QmlProfilerTraceFile(QObject *parent) : Timeline::TimelineTraceFile(parent)
{
    static int meta[] = {
        qRegisterMetaType<QVector<QmlEvent> >(),
        qRegisterMetaType<QVector<QmlEventType> >(),
        qRegisterMetaType<QVector<QmlNote> >()
    };
    Q_UNUSED(meta)
}

void QmlProfilerTraceFile::load(QIODevice *device)
{
    const QFile *file = qobject_cast<QFile *>(device);
    if (file && file->fileName().endsWith(Constants::QtdFileExtension))
        loadQtd(device);
    else
        loadQzt(device);
}

void QmlProfilerTraceFile::save(QIODevice *device)
{
    const QFile *file = qobject_cast<QFile *>(device);
    if (file && file->fileName().endsWith(Constants::QtdFileExtension))
        saveQtd(device);
    else
        saveQzt(device);
}

void QmlProfilerTraceFile::loadQtd(QIODevice *device)
{
    QXmlStreamReader stream(device);

    bool validVersion = true;

    while (validVersion && !stream.atEnd() && !stream.hasError() && !isCanceled()) {
        QXmlStreamReader::TokenType token = stream.readNext();
        const QStringView elementName = stream.name();
        switch (token) {
        case QXmlStreamReader::StartDocument :  continue;
        case QXmlStreamReader::StartElement : {
            if (elementName == _("trace")) {
                QXmlStreamAttributes attributes = stream.attributes();
                if (attributes.hasAttribute(_("version")))
                    validVersion = attributes.value(_("version")) == _(PROFILER_FILE_VERSION);
                else
                    validVersion = false;
                if (attributes.hasAttribute(_("traceStart")))
                    setTraceStart(attributes.value(_("traceStart")).toLongLong());
                if (attributes.hasAttribute(_("traceEnd")))
                    setTraceEnd(attributes.value(_("traceEnd")).toLongLong());
            }

            if (elementName == _("eventData")) {
                loadEventTypes(stream);
                break;
            }

            if (elementName == _("profilerDataModel")) {
                loadEvents(stream);
                break;
            }

            if (elementName == _("noteData")) {
                loadNotes(stream);
                break;
            }

            break;
        }
        default: break;
        }
    }

    if (stream.hasError())
        fail(tr("Error while parsing trace data file: %1").arg(stream.errorString()));
    else
        finish();
}

void QmlProfilerTraceFile::loadQzt(QIODevice *device)
{
    QDataStream stream(device);
    stream.setVersion(QDataStream::Qt_5_5);

    QByteArray magic;
    stream >> magic;
    if (magic != QByteArray("QMLPROFILER")) {
        fail(tr("Invalid magic: %1").arg(QLatin1String(magic)));
        return;
    }

    qint32 dataStreamVersion;
    stream >> dataStreamVersion;

    if (dataStreamVersion > QDataStream::Qt_DefaultCompiledVersion) {
        fail(tr("Unknown data stream version: %1").arg(dataStreamVersion));
        return;
    }
    stream.setVersion(dataStreamVersion);

    qint64 traceStart, traceEnd;
    stream >> traceStart >> traceEnd;
    setTraceStart(traceStart);
    setTraceEnd(traceEnd);

    QBuffer buffer;
    QDataStream bufferStream(&buffer);
    bufferStream.setVersion(dataStreamVersion);
    QByteArray data;
    setDeviceProgress(device);

    QmlProfilerModelManager *manager = modelManager();
    if (!isCanceled()) {
        stream >> data;
        buffer.setData(qUncompress(data));
        buffer.open(QIODevice::ReadOnly);
        quint32 numEventTypes;
        bufferStream >> numEventTypes;
        if (numEventTypes > quint32(std::numeric_limits<int>::max())) {
            fail(tr("Excessive number of event types: %1").arg(numEventTypes));
            return;
        }

        for (int typeId = 0; typeId < static_cast<int>(numEventTypes); ++typeId) {
            QmlEventType type;
            bufferStream >> type;
            manager->setEventType(typeId, std::move(type));
        }
        buffer.close();
        setDeviceProgress(device);
    }

    if (!isCanceled()) {
        stream >> data;
        buffer.setData(qUncompress(data));
        buffer.open(QIODevice::ReadOnly);
        QVector<QmlNote> notes;
        bufferStream >> notes;
        buffer.close();
        qmlNotes()->setNotes(notes);
        setDeviceProgress(device);
    }

    while (!stream.atEnd() && !isCanceled()) {
        stream >> data;
        buffer.setData(qUncompress(data));
        buffer.open(QIODevice::ReadOnly);
        while (!buffer.atEnd() && !isCanceled()) {
            QmlEvent event;
            bufferStream >> event;
            if (bufferStream.status() == QDataStream::Ok) {
                if (event.typeIndex() >= traceManager()->numEventTypes()) {
                    fail(tr("Invalid type index %1").arg(event.typeIndex()));
                    return;
                }
                addFeature(manager->eventType(event.typeIndex()).feature());
                if (event.timestamp() < 0)
                    event.setTimestamp(0);
            } else if (bufferStream.status() == QDataStream::ReadPastEnd) {
                break; // Apparently EOF is a character so we end up here after the last event.
            } else if (bufferStream.status() == QDataStream::ReadCorruptData) {
                fail(tr("Corrupt data before position %1.").arg(device->pos()));
                return;
            } else {
                Q_UNREACHABLE();
            }
            manager->appendEvent(std::move(event));
        }
        buffer.close();
        setDeviceProgress(device);
    }

    finish();
}

void QmlProfilerTraceFile::addEventsProgress(qint64 timestamp)
{
    addProgressValue(static_cast<float>(timestamp) / static_cast<float>(traceEnd() - traceStart())
                     * ProgressEvents);
}

void QmlProfilerTraceFile::addStageProgress(QmlProfilerTraceFile::ProgressValues stage)
{
    addProgressValue(stage);
}

void QmlProfilerTraceFile::loadEventTypes(QXmlStreamReader &stream)
{
    QTC_ASSERT(stream.name() == _("eventData"), return);

    int typeIndex = -1;

    QPair<Message, RangeType> messageAndRange(MaximumMessage, MaximumRangeType);
    int detailType = -1;
    QString displayName;
    QString data;
    QString filename;
    int line = 0, column = 0;

    auto clearType = [&](){
        messageAndRange = QPair<Message, RangeType>(MaximumMessage, MaximumRangeType);
        detailType = -1;
        displayName.clear();
        data.clear();
        filename.clear();
        line = column = 0;
    };

    while (!stream.atEnd() && !stream.hasError() && !isCanceled()) {

        QXmlStreamReader::TokenType token = stream.readNext();
        const QStringView elementName = stream.name();

        switch (token) {
        case QXmlStreamReader::StartElement: {
            if (elementName == _("event")) {
                setDeviceProgress(stream.device());
                clearType();

                const QXmlStreamAttributes attributes = stream.attributes();
                if (attributes.hasAttribute(_("index"))) {
                    typeIndex = attributes.value(_("index")).toInt();
                } else {
                    // ignore event
                    typeIndex = -1;
                }
                break;
            }

            stream.readNext();
            if (stream.tokenType() != QXmlStreamReader::Characters)
                break;

            const QString readData = stream.text().toString();

            if (elementName == _("displayname")) {
                displayName = readData;
                break;
            }

            if (elementName == _("type")) {
                messageAndRange = qmlTypeAsEnum(readData);
                break;
            }

            if (elementName == _("filename")) {
                filename = readData;
                break;
            }

            if (elementName == _("line")) {
                line = readData.toInt();
                break;
            }

            if (elementName == _("column")) {
                column = readData.toInt();
                break;
            }

            if (elementName == _("details")) {
                data = readData;
                break;
            }

            if (elementName == _("animationFrame")) {
                detailType = readData.toInt();
                // new animation frames used to be saved as ranges of range type Painting with
                // binding type 4 (which was called "AnimationFrame" to make everything even more
                // confusing), even though they clearly aren't ranges. Convert that to something
                // sane here.
                if (detailType == 4) {
                    messageAndRange = QPair<Message, RangeType>(Event, MaximumRangeType);
                    detailType = AnimationFrame;
                }
            }

            if (elementName == _("bindingType") ||
                    elementName == _("cacheEventType") ||
                    elementName == _("sgEventType") ||
                    elementName == _("memoryEventType") ||
                    elementName == _("mouseEvent") ||
                    elementName == _("keyEvent") ||
                    elementName == _("level")) {
                detailType = readData.toInt();
                break;
            }

            break;
        }
        case QXmlStreamReader::EndElement: {
            if (elementName == _("event")) {
                if (typeIndex >= 0) {
                    QmlEventType type(messageAndRange.first, messageAndRange.second,
                                      detailType, QmlEventLocation(filename, line, column),
                                      data, displayName);
                    const quint8 feature = type.feature();
                    modelManager()->setEventType(typeIndex, std::move(type));
                    if (feature != MaximumProfileFeature)
                        addFeature(feature);
                }
                break;
            }

            if (elementName == _("eventData")) {
                // done reading eventData
                return;
            }
            break;
        }
        default: break;
        } // switch
    }
}

class EventList
{
public:
    void addEvent(const QmlEvent &event);
    void addRange(const QmlEvent &start, const QmlEvent &end);

    void finalize(QmlProfilerModelManager *modelManager);

private:
    struct QmlRange {
        QmlEvent begin;
        QmlEvent end;
    };

    QList<QmlRange> ranges; // We are going to do a lot of takeFirst() on this.
};

void EventList::addEvent(const QmlEvent &event)
{
    ranges.append({event, QmlEvent()});
}

void EventList::addRange(const QmlEvent &start, const QmlEvent &end)
{
    ranges.append({start, end});
}

void EventList::finalize(QmlProfilerModelManager *modelManager)
{
    std::sort(ranges.begin(), ranges.end(), [](const QmlRange &a, const QmlRange &b) {
        if (a.begin.timestamp() < b.begin.timestamp())
            return true;
        if (a.begin.timestamp() > b.begin.timestamp())
            return false;

        // If the start times are equal. Sort the one with the greater end time first, so that
        // the nesting is retained.
        return (a.end.timestamp() > b.end.timestamp());
    });

    QList<QmlEvent> ends;
    while (!ranges.isEmpty()) {
        // This is more expensive than just iterating, but we don't want to double the already
        // high memory footprint.
        QmlRange range = ranges.takeFirst();
        while (!ends.isEmpty() && ends.last().timestamp() <= range.begin.timestamp())
            modelManager->appendEvent(ends.takeLast());

        if (range.end.isValid()) {
            auto it = ends.end();
            for (auto begin = ends.begin(); it != begin;) {
                if ((--it)->timestamp() >= range.end.timestamp()) {
                    ++it;
                    break;
                }
            }
            ends.insert(it, range.end);
        }
        modelManager->appendEvent(std::move(range.begin));
    }
    while (!ends.isEmpty())
        modelManager->appendEvent(ends.takeLast());
}

void QmlProfilerTraceFile::loadEvents(QXmlStreamReader &stream)
{
    QTC_ASSERT(stream.name() == _("profilerDataModel"), return);
    EventList events;

    while (!stream.atEnd() && !stream.hasError() && !isCanceled()) {

        QXmlStreamReader::TokenType token = stream.readNext();
        const QStringView elementName = stream.name();

        switch (token) {
        case QXmlStreamReader::StartElement: {
            if (elementName == _("range")) {
                setDeviceProgress(stream.device());
                QmlEvent event;

                const QXmlStreamAttributes attributes = stream.attributes();
                if (!attributes.hasAttribute(_("startTime"))
                        || !attributes.hasAttribute(_("eventIndex"))) {
                    // ignore incomplete entry
                    continue;
                }

                const qint64 timestamp = attributes.value(_("startTime")).toLongLong();
                event.setTimestamp(timestamp > 0 ? timestamp : 0);
                event.setTypeIndex(attributes.value(_("eventIndex")).toInt());

                if (attributes.hasAttribute(_("duration"))) {
                    event.setRangeStage(RangeStart);
                    QmlEvent rangeEnd(event);
                    rangeEnd.setRangeStage(RangeEnd);
                    const qint64 duration = attributes.value(_("duration")).toLongLong();
                    rangeEnd.setTimestamp(event.timestamp() + (duration > 0 ? duration : 0));
                    events.addRange(event, rangeEnd);
                } else {
                    // attributes for special events
                    if (attributes.hasAttribute(_("framerate")))
                        event.setNumber<qint32>(0, attributes.value(_("framerate")).toInt());
                    if (attributes.hasAttribute(_("animationcount")))
                        event.setNumber<qint32>(1, attributes.value(_("animationcount")).toInt());
                    if (attributes.hasAttribute(_("thread")))
                        event.setNumber<qint32>(2, attributes.value(_("thread")).toInt());
                    if (attributes.hasAttribute(_("width")))
                        event.setNumber<qint32>(0, attributes.value(_("width")).toInt());
                    if (attributes.hasAttribute(_("height")))
                        event.setNumber<qint32>(1, attributes.value(_("height")).toInt());
                    if (attributes.hasAttribute(_("refCount")))
                        event.setNumber<qint32>(2, attributes.value(_("refCount")).toInt());
                    if (attributes.hasAttribute(_("amount")))
                        event.setNumber<qint64>(0, attributes.value(_("amount")).toLongLong());
                    if (attributes.hasAttribute(_("timing1")))
                        event.setNumber<qint64>(0, attributes.value(_("timing1")).toLongLong());
                    if (attributes.hasAttribute(_("timing2")))
                        event.setNumber<qint64>(1, attributes.value(_("timing2")).toLongLong());
                    if (attributes.hasAttribute(_("timing3")))
                        event.setNumber<qint64>(2, attributes.value(_("timing3")).toLongLong());
                    if (attributes.hasAttribute(_("timing4")))
                        event.setNumber<qint64>(3, attributes.value(_("timing4")).toLongLong());
                    if (attributes.hasAttribute(_("timing5")))
                        event.setNumber<qint64>(4, attributes.value(_("timing5")).toLongLong());
                    if (attributes.hasAttribute(_("type")))
                        event.setNumber<qint32>(0, attributes.value(_("type")).toInt());
                    if (attributes.hasAttribute(_("data1")))
                        event.setNumber<qint32>(1, attributes.value(_("data1")).toInt());
                    if (attributes.hasAttribute(_("data2")))
                        event.setNumber<qint32>(2, attributes.value(_("data2")).toInt());
                    if (attributes.hasAttribute(_("text")))
                        event.setString(attributes.value(_("text")).toString());

                    events.addEvent(event);
                }
            }
            break;
        }
        case QXmlStreamReader::EndElement: {
            if (elementName == _("profilerDataModel")) {
                // done reading profilerDataModel
                events.finalize(modelManager());
                return;
            }
            break;
        }
        default: break;
        } // switch
    }
}

void QmlProfilerTraceFile::loadNotes(QXmlStreamReader &stream)
{
    QmlNote currentNote;
    while (!stream.atEnd() && !stream.hasError() && !isCanceled()) {

        QXmlStreamReader::TokenType token = stream.readNext();
        const QStringView elementName = stream.name();

        switch (token) {
        case QXmlStreamReader::StartElement: {
            if (elementName == _("note")) {
                setDeviceProgress(stream.device());
                QXmlStreamAttributes attrs = stream.attributes();
                int collapsedRow = attrs.hasAttribute(_("collapsedRow")) ?
                            attrs.value(_("collapsedRow")).toInt() : -1;

                currentNote = QmlNote(attrs.value(_("eventIndex")).toInt(),
                                      collapsedRow,
                                      attrs.value(_("startTime")).toLongLong(),
                                      attrs.value(_("duration")).toLongLong());
            }
            break;
        }
        case QXmlStreamReader::Characters: {
            currentNote.setText(stream.text().toString());
            break;
        }
        case QXmlStreamReader::EndElement: {
            if (elementName == _("note")) {
                qmlNotes()->addNote(currentNote);
            } else if (elementName == _("noteData")) {
                return;
            }
            break;
        }
        default:
            break;
        }
    }
}

void QmlProfilerTraceFile::saveQtd(QIODevice *device)
{
    QXmlStreamWriter stream(device);

    stream.setAutoFormatting(true);
    stream.writeStartDocument();

    stream.writeStartElement(_("trace"));
    stream.writeAttribute(_("version"), _(PROFILER_FILE_VERSION));

    stream.writeAttribute(_("traceStart"), QString::number(traceStart()));
    stream.writeAttribute(_("traceEnd"), QString::number(traceEnd()));

    stream.writeStartElement(_("eventData"));
    stream.writeAttribute(_("totalTime"), QString::number(measuredTime()));
    const QmlProfilerModelManager *manager = modelManager();
    for (int typeIndex = 0, end = manager->numEventTypes(); typeIndex < end && !isCanceled();
         ++typeIndex) {

        const QmlEventType &type = manager->eventType(typeIndex);

        stream.writeStartElement(_("event"));
        stream.writeAttribute(_("index"), QString::number(typeIndex));
        stream.writeTextElement(_("displayname"), type.displayName());
        stream.writeTextElement(_("type"), qmlTypeAsString(type.message(), type.rangeType()));
        const QmlEventLocation location(type.location());
        if (!location.filename().isEmpty()) {
            stream.writeTextElement(_("filename"), location.filename());
            stream.writeTextElement(_("line"), QString::number(location.line()));
            stream.writeTextElement(_("column"), QString::number(location.column()));
        }

        if (!type.data().isEmpty())
            stream.writeTextElement(_("details"), type.data());

        if (type.rangeType() == Binding) {
            stream.writeTextElement(_("bindingType"), QString::number(type.detailType()));
        } else if (type.message() == Event) {
            switch (type.detailType()) {
            case AnimationFrame:
                stream.writeTextElement(_("animationFrame"), QString::number(type.detailType()));
                break;
            case Key:
                stream.writeTextElement(_("keyEvent"), QString::number(type.detailType()));
                break;
            case Mouse:
                stream.writeTextElement(_("mouseEvent"), QString::number(type.detailType()));
                break;
            default:
                break;
            }
        } else if (type.message() == PixmapCacheEvent) {
            stream.writeTextElement(_("cacheEventType"), QString::number(type.detailType()));
        } else if (type.message() == SceneGraphFrame) {
            stream.writeTextElement(_("sgEventType"), QString::number(type.detailType()));
        } else if (type.message() == MemoryAllocation) {
            stream.writeTextElement(_("memoryEventType"), QString::number(type.detailType()));
        } else if (type.message() == DebugMessage) {
            stream.writeTextElement(_("level"), QString::number(type.detailType()));
        }
        stream.writeEndElement();
    }
    addStageProgress(ProgressTypes);
    stream.writeEndElement(); // eventData

    if (isCanceled())
        return;

    QStack<QmlEvent> stack;
    qint64 lastProgressTimestamp = traceStart();
    modelManager()->replayQmlEvents([&](const QmlEvent &event, const QmlEventType &type) {
        if (type.rangeType() != MaximumRangeType && event.rangeStage() == RangeStart) {
            stack.push(event);
            return;
        }

        stream.writeStartElement(_("range"));
        if (type.rangeType() != MaximumRangeType && event.rangeStage() == RangeEnd) {
            QmlEvent start = stack.pop();
            stream.writeAttribute(_("startTime"), QString::number(start.timestamp()));
            stream.writeAttribute(_("duration"),
                                  QString::number(event.timestamp() - start.timestamp()));
        } else {
            stream.writeAttribute(_("startTime"), QString::number(event.timestamp()));
        }

        stream.writeAttribute(_("eventIndex"), QString::number(event.typeIndex()));

        if (type.message() == Event) {
            if (type.detailType() == AnimationFrame) {
                // special: animation event
                stream.writeAttribute(_("framerate"), QString::number(event.number<qint32>(0)));
                stream.writeAttribute(_("animationcount"),
                                      QString::number(event.number<qint32>(1)));
                stream.writeAttribute(_("thread"), QString::number(event.number<qint32>(2)));
            } else if (type.detailType() == Key || type.detailType() == Mouse) {
                // special: input event
                stream.writeAttribute(_("type"), QString::number(event.number<qint32>(0)));
                stream.writeAttribute(_("data1"), QString::number(event.number<qint32>(1)));
                stream.writeAttribute(_("data2"), QString::number(event.number<qint32>(2)));
            }
        }

        // special: pixmap cache event
        if (type.message() == PixmapCacheEvent) {
            if (type.detailType() == PixmapSizeKnown) {
                stream.writeAttribute(_("width"), QString::number(event.number<qint32>(0)));
                stream.writeAttribute(_("height"), QString::number(event.number<qint32>(1)));
            }

            if (type.detailType() == PixmapReferenceCountChanged
                    || type.detailType() == PixmapCacheCountChanged)
                stream.writeAttribute(_("refCount"), QString::number(event.number<qint32>(2)));
        }

        if (type.message() == SceneGraphFrame) {
            // special: scenegraph frame events
            for (int i = 0; i < 5; ++i) {
                qint64 number = event.number<qint64>(i);
                if (number <= 0)
                    continue;
                stream.writeAttribute(QString::fromLatin1("timing%1").arg(i + 1),
                                      QString::number(number));
            }
        }

        // special: memory allocation event
        if (type.message() == MemoryAllocation)
            stream.writeAttribute(_("amount"), QString::number(event.number<qint64>(0)));

        if (type.message() == DebugMessage)
            stream.writeAttribute(_("text"), event.string());

        stream.writeEndElement();

        if (isProgressUpdateNeeded()) {
            addEventsProgress(event.timestamp() - lastProgressTimestamp);
            lastProgressTimestamp = event.timestamp();
        }
    }, [&stream](){
        stream.writeStartElement(_("profilerDataModel"));
    }, [this, &stream]() {
        stream.writeEndElement(); // profilerDataModel
        if (!isCanceled()) {
            stream.writeStartElement(_("noteData"));
            const QVector<QmlNote> &notes = qmlNotes()->notes();
            for (int noteIndex = 0; noteIndex < notes.length() && !isCanceled(); ++noteIndex) {
                const QmlNote &note = notes[noteIndex];
                stream.writeStartElement(_("note"));
                stream.writeAttribute(_("startTime"), QString::number(note.startTime()));
                stream.writeAttribute(_("duration"), QString::number(note.duration()));
                stream.writeAttribute(_("eventIndex"), QString::number(note.typeIndex()));
                stream.writeAttribute(_("collapsedRow"), QString::number(note.collapsedRow()));
                stream.writeCharacters(note.text());
                stream.writeEndElement(); // note
            }
            stream.writeEndElement(); // noteData
            addStageProgress(ProgressNotes);
        }

        stream.writeEndElement(); // trace
        stream.writeEndDocument();

        if (stream.hasError())
            fail(tr("Error writing trace file."));
    }, [this](const QString &message) {
        fail(tr("Could not re-read events from temporary trace file: %1\nSaving failed.")
             .arg(message));
    }, future());
}

void QmlProfilerTraceFile::saveQzt(QIODevice *device)
{
    QDataStream stream(device);
    stream.setVersion(QDataStream::Qt_5_5);
    stream << QByteArray("QMLPROFILER");
    stream << static_cast<qint32>(QDataStream::Qt_DefaultCompiledVersion);
    stream.setVersion(QDataStream::Qt_DefaultCompiledVersion);

    stream << traceStart() << traceEnd();

    QBuffer buffer;
    QDataStream bufferStream(&buffer);
    buffer.open(QIODevice::WriteOnly);

    if (!isCanceled()) {
        const QmlProfilerModelManager *manager = modelManager();
        const int numEventTypes = manager->numEventTypes();
        bufferStream << static_cast<quint32>(numEventTypes);
        for (int typeId = 0; typeId < numEventTypes; ++typeId)
            bufferStream << manager->eventType(typeId);
        stream << qCompress(buffer.data());
        buffer.close();
        buffer.buffer().clear();
        addStageProgress(ProgressTypes);
    }

    if (!isCanceled()) {
        buffer.open(QIODevice::WriteOnly);
        bufferStream << qmlNotes()->notes();
        stream << qCompress(buffer.data());
        buffer.close();
        buffer.buffer().clear();
        addStageProgress(ProgressNotes);
    }

    if (isCanceled())
        return;

    qint64 lastProgressTimestamp = traceStart();
    modelManager()->replayQmlEvents([&](const QmlEvent &event, const QmlEventType &type) {
        Q_UNUSED(type)
        bufferStream << event;
        // 32MB buffer should be plenty for efficient compression
        if (buffer.data().length() > (1 << 25)) {
            stream << qCompress(buffer.data());
            buffer.close();
            buffer.buffer().clear();
            buffer.open(QIODevice::WriteOnly);
            if (isProgressUpdateNeeded()) {
                addEventsProgress(event.timestamp() - lastProgressTimestamp);
                lastProgressTimestamp = event.timestamp();
            }
        }
    }, [&]() {
        buffer.open(QIODevice::WriteOnly);
    }, [&]() {
        if (!isCanceled()) {
            stream << qCompress(buffer.data());
            buffer.close();
            buffer.buffer().clear();
            addEventsProgress(traceEnd() - lastProgressTimestamp);
        }
    }, [this](const QString &message) {
        fail(tr("Could not re-read events from temporary trace file: %1\nSaving failed.")
             .arg(message));
    }, future());
}

QmlProfilerModelManager *QmlProfilerTraceFile::modelManager()
{
    return static_cast<QmlProfilerModelManager *>(traceManager());
}

QmlProfilerNotesModel *QmlProfilerTraceFile::qmlNotes()
{
    return static_cast<QmlProfilerNotesModel *>(notes());
}

} // namespace Internal
} // namespace QmlProfiler