Remove last traces of QV8Engine

Change-Id: I59f738402d51e39188bbbca2ef1fbc8a61612372
Reviewed-by: Simon Hausmann <[email protected]>

27 files changed, 404 insertions, 687 deletions

diff --git a/src/imports/localstorage/plugin.cpp b/src/imports/localstorage/plugin.cpp
index 0aad0d7c16..9004d1ee6f 100644
--- a/src/imports/localstorage/plugin.cpp
+++ b/src/imports/localstorage/plugin.cpp
@@ -85,7 +85,7 @@ QT_BEGIN_NAMESPACE
 }
 
 
-class QQmlSqlDatabaseData : public QV8Engine::Deletable
+class QQmlSqlDatabaseData : public QV4::ExecutionEngine::Deletable
 {
 public:
     QQmlSqlDatabaseData(QV4::ExecutionEngine *engine);
diff --git a/src/particles/qquickv4particledata.cpp b/src/particles/qquickv4particledata.cpp
index 383444a808..459797f977 100644
--- a/src/particles/qquickv4particledata.cpp
+++ b/src/particles/qquickv4particledata.cpp
@@ -290,7 +290,7 @@ struct QV4ParticleData : public QV4::Object
 
 DEFINE_OBJECT_VTABLE(QV4ParticleData);
 
-class QV4ParticleDataDeletable : public QV8Engine::Deletable
+class QV4ParticleDataDeletable : public QV4::ExecutionEngine::Deletable
 {
 public:
     QV4ParticleDataDeletable(QV4::ExecutionEngine *engine);
diff --git a/src/qml/compiler/qqmltypecompiler.cpp b/src/qml/compiler/qqmltypecompiler.cpp
index db57d38c24..996b2f16ae 100644
--- a/src/qml/compiler/qqmltypecompiler.cpp
+++ b/src/qml/compiler/qqmltypecompiler.cpp
@@ -146,7 +146,7 @@ QQmlRefPointer<QV4::CompiledData::CompilationUnit> QQmlTypeCompiler::compile()
         document->jsModule.fileName = typeData->urlString();
         document->jsModule.finalUrl = typeData->finalUrlString();
         QmlIR::JSCodeGen v4CodeGenerator(document->code, &document->jsGenerator, &document->jsModule, &document->jsParserEngine,
-                                         document->program, &document->jsGenerator.stringTable, engine->v8engine()->illegalNames());
+                                         document->program, &document->jsGenerator.stringTable, engine->v4engine()->illegalNames());
         QQmlJSCodeGenerator jsCodeGen(this, &v4CodeGenerator);
         if (!jsCodeGen.generateCodeForComponents())
             return nullptr;
@@ -298,7 +298,7 @@ SignalHandlerConverter::SignalHandlerConverter(QQmlTypeCompiler *typeCompiler)
     , qmlObjects(*typeCompiler->qmlObjects())
     , imports(typeCompiler->imports())
     , customParsers(typeCompiler->customParserCache())
-    , illegalNames(typeCompiler->enginePrivate()->v8engine()->illegalNames())
+    , illegalNames(typeCompiler->enginePrivate()->v4engine()->illegalNames())
     , propertyCaches(typeCompiler->propertyCaches())
 {
 }
diff --git a/src/qml/jsapi/qjsengine.cpp b/src/qml/jsapi/qjsengine.cpp
index 45ea79d31a..7bf2a4d004 100644
--- a/src/qml/jsapi/qjsengine.cpp
+++ b/src/qml/jsapi/qjsengine.cpp
@@ -41,7 +41,6 @@
 #include "qjsengine_p.h"
 #include "qjsvalue.h"
 #include "qjsvalue_p.h"
-#include "private/qv8engine_p.h"
 
 #include "private/qv4engine_p.h"
 #include "private/qv4mm_p.h"
@@ -348,7 +347,6 @@ QJSEngine::QJSEngine(QObject *parent)
     : QObject(*new QJSEnginePrivate, parent)
     , m_v4Engine(new QV4::ExecutionEngine(this))
 {
-    m_v4Engine->v8Engine = new QV8Engine(m_v4Engine);
     checkForApplicationInstance();
 
     QJSEnginePrivate::addToDebugServer(this);
@@ -361,7 +359,6 @@ QJSEngine::QJSEngine(QJSEnginePrivate &dd, QObject *parent)
     : QObject(dd, parent)
     , m_v4Engine(new QV4::ExecutionEngine(this))
 {
-    m_v4Engine->v8Engine = new QV8Engine(m_v4Engine);
     checkForApplicationInstance();
 }
 
@@ -375,7 +372,6 @@ QJSEngine::QJSEngine(QJSEnginePrivate &dd, QObject *parent)
 QJSEngine::~QJSEngine()
 {
     QJSEnginePrivate::removeFromDebugServer(this);
-    delete m_v4Engine->v8Engine;
     delete m_v4Engine;
 }
 
diff --git a/src/qml/jsruntime/qv4engine.cpp b/src/qml/jsruntime/qv4engine.cpp
index b65a2f2dad..b04a879c7f 100644
--- a/src/qml/jsruntime/qv4engine.cpp
+++ b/src/qml/jsruntime/qv4engine.cpp
@@ -102,7 +102,6 @@
 #include "qv4dataview_p.h"
 #include "qv4promiseobject_p.h"
 #include "qv4typedarray_p.h"
-#include <private/qv8engine_p.h>
 #include <private/qjsvalue_p.h>
 #include <private/qqmltypewrapper_p.h>
 #include <private/qqmlvaluetypewrapper_p.h>
@@ -110,9 +109,16 @@
 #include <private/qqmllistwrapper_p.h>
 #include <private/qqmllist_p.h>
 #include <private/qqmltypeloader_p.h>
+#include <private/qqmlmemoryprofiler_p.h>
+#include <private/qqmlbuiltinfunctions_p.h>
 #if QT_CONFIG(qml_locale)
 #include <private/qqmllocale_p.h>
 #endif
+#if QT_CONFIG(qml_xml_http_request)
+#include <private/qv4domerrors_p.h>
+#include <private/qqmlxmlhttprequest_p.h>
+#endif
+#include <private/qv4sqlerrors_p.h>
 #include <qqmlfile.h>
 
 #if USE(PTHREADS)
@@ -129,6 +135,8 @@
 #include <valgrind/memcheck.h>
 #endif
 
+Q_DECLARE_METATYPE(QList<int>)
+
 QT_BEGIN_NAMESPACE
 
 using namespace QV4;
@@ -142,6 +150,43 @@ ReturnedValue throwTypeError(const FunctionObject *b, const QV4::Value *, const
 
 qint32 ExecutionEngine::maxCallDepth = -1;
 
+template <typename ReturnType>
+ReturnType convertJSValueToVariantType(const QJSValue &value)
+{
+    return value.toVariant().value<ReturnType>();
+}
+
+static void saveJSValue(QDataStream &stream, const void *data)
+{
+    const QJSValue *jsv = reinterpret_cast<const QJSValue *>(data);
+    quint32 isNullOrUndefined = 0;
+    if (jsv->isNull())
+        isNullOrUndefined |= 0x1;
+    if (jsv->isUndefined())
+        isNullOrUndefined |= 0x2;
+    stream << isNullOrUndefined;
+    if (!isNullOrUndefined)
+        reinterpret_cast<const QJSValue*>(data)->toVariant().save(stream);
+}
+
+static void restoreJSValue(QDataStream &stream, void *data)
+{
+    QJSValue *jsv = reinterpret_cast<QJSValue*>(data);
+
+    quint32 isNullOrUndefined;
+    stream >> isNullOrUndefined;
+
+    if (isNullOrUndefined & 0x1) {
+        *jsv = QJSValue(QJSValue::NullValue);
+    } else if (isNullOrUndefined & 0x2) {
+        *jsv = QJSValue();
+    } else {
+        QVariant v;
+        v.load(stream);
+        QJSValuePrivate::setVariant(jsv, v);
+    }
+}
+
 ExecutionEngine::ExecutionEngine(QJSEngine *jsEngine)
     : executableAllocator(new QV4::ExecutableAllocator)
     , regExpAllocator(new QV4::ExecutableAllocator)
@@ -149,7 +194,6 @@ ExecutionEngine::ExecutionEngine(QJSEngine *jsEngine)
     , jsStack(new WTF::PageAllocation)
     , gcStack(new WTF::PageAllocation)
     , globalCode(nullptr)
-    , v8Engine(nullptr)
     , publicEngine(jsEngine)
     , m_engineId(engineSerial.fetchAndAddOrdered(1))
     , regExpCache(nullptr)
@@ -157,6 +201,10 @@ ExecutionEngine::ExecutionEngine(QJSEngine *jsEngine)
 #if QT_CONFIG(qml_jit)
     , m_canAllocateExecutableMemory(OSAllocator::canAllocateExecutableMemory())
 #endif
+#if QT_CONFIG(qml_xml_http_request)
+    , m_xmlHttpRequestData(nullptr)
+#endif
+    , m_qmlEngine(nullptr)
 {
     memoryManager = new QV4::MemoryManager(this);
 
@@ -643,11 +691,28 @@ ExecutionEngine::ExecutionEngine(QJSEngine *jsEngine)
     pd->set = thrower();
     functionPrototype()->insertMember(id_caller(), pd, Attr_Accessor|Attr_ReadOnly_ButConfigurable);
     functionPrototype()->insertMember(id_arguments(), pd, Attr_Accessor|Attr_ReadOnly_ButConfigurable);
+
+    QML_MEMORY_SCOPE_STRING("QV4Engine::QV4Engine");
+    qMetaTypeId<QJSValue>();
+    qMetaTypeId<QList<int> >();
+
+    if (!QMetaType::hasRegisteredConverterFunction<QJSValue, QVariantMap>())
+        QMetaType::registerConverter<QJSValue, QVariantMap>(convertJSValueToVariantType<QVariantMap>);
+    if (!QMetaType::hasRegisteredConverterFunction<QJSValue, QVariantList>())
+        QMetaType::registerConverter<QJSValue, QVariantList>(convertJSValueToVariantType<QVariantList>);
+    if (!QMetaType::hasRegisteredConverterFunction<QJSValue, QStringList>())
+        QMetaType::registerConverter<QJSValue, QStringList>(convertJSValueToVariantType<QStringList>);
+    QMetaType::registerStreamOperators(qMetaTypeId<QJSValue>(), saveJSValue, restoreJSValue);
+
+    QV4::QObjectWrapper::initializeBindings(this);
+
+    m_delayedCallQueue.init(this);
 }
 
 ExecutionEngine::~ExecutionEngine()
 {
     modules.clear();
+    qDeleteAll(m_extensionData);
     delete m_multiplyWrappedQObjects;
     m_multiplyWrappedQObjects = nullptr;
     delete identifierTable;
@@ -664,6 +729,11 @@ ExecutionEngine::~ExecutionEngine()
     delete jsStack;
     gcStack->deallocate();
     delete gcStack;
+
+#if QT_CONFIG(qml_xml_http_request)
+    qt_rem_qmlxmlhttprequest(this, m_xmlHttpRequestData);
+    m_xmlHttpRequestData = nullptr;
+#endif
 }
 
 ExecutionContext *ExecutionEngine::currentContext() const
@@ -1750,6 +1820,133 @@ QQmlRefPointer<CompiledData::CompilationUnit> ExecutionEngine::loadModule(const
     return newModule;
 }
 
+void ExecutionEngine::initQmlGlobalObject()
+{
+    initializeGlobal();
+    freezeObject(*globalObject);
+}
+
+void ExecutionEngine::initializeGlobal()
+{
+    QV4::Scope scope(this);
+    QV4::GlobalExtensions::init(globalObject, QJSEngine::AllExtensions);
+
+    QV4::ScopedObject qt(scope, memoryManager->allocate<QV4::QtObject>(qmlEngine()));
+    globalObject->defineDefaultProperty(QStringLiteral("Qt"), qt);
+
+#if QT_CONFIG(qml_locale)
+    QQmlLocale::registerStringLocaleCompare(this);
+    QQmlDateExtension::registerExtension(this);
+    QQmlNumberExtension::registerExtension(this);
+#endif
+
+#if QT_CONFIG(qml_xml_http_request)
+    qt_add_domexceptions(this);
+    m_xmlHttpRequestData = qt_add_qmlxmlhttprequest(this);
+#endif
+
+    qt_add_sqlexceptions(this);
+
+    {
+        for (uint i = 0; i < globalObject->internalClass()->size; ++i) {
+            if (globalObject->internalClass()->nameMap.at(i).isString()) {
+                QV4::PropertyKey id = globalObject->internalClass()->nameMap.at(i);
+                m_illegalNames.insert(id.toQString());
+            }
+        }
+    }
+}
+
+const QSet<QString> &ExecutionEngine::illegalNames() const
+{
+    return m_illegalNames;
+}
+
+void ExecutionEngine::setQmlEngine(QQmlEngine *engine)
+{
+    m_qmlEngine = engine;
+    initQmlGlobalObject();
+}
+
+static void freeze_recursive(QV4::ExecutionEngine *v4, QV4::Object *object)
+{
+    if (object->as<QV4::QObjectWrapper>())
+        return;
+
+    QV4::Scope scope(v4);
+
+    bool instanceOfObject = false;
+    QV4::ScopedObject p(scope, object->getPrototypeOf());
+    while (p) {
+        if (p->d() == v4->objectPrototype()->d()) {
+            instanceOfObject = true;
+            break;
+        }
+        p = p->getPrototypeOf();
+    }
+    if (!instanceOfObject)
+        return;
+
+    QV4::Heap::InternalClass *frozen = object->internalClass()->propertiesFrozen();
+    if (object->internalClass() == frozen)
+        return;
+    object->setInternalClass(frozen);
+
+    QV4::ScopedObject o(scope);
+    for (uint i = 0; i < frozen->size; ++i) {
+        if (!frozen->nameMap.at(i).isStringOrSymbol())
+            continue;
+        o = *object->propertyData(i);
+        if (o)
+            freeze_recursive(v4, o);
+    }
+}
+
+void ExecutionEngine::freezeObject(const QV4::Value &value)
+{
+    QV4::Scope scope(this);
+    QV4::ScopedObject o(scope, value);
+    freeze_recursive(this, o);
+}
+
+void ExecutionEngine::startTimer(const QString &timerName)
+{
+    if (!m_time.isValid())
+        m_time.start();
+    m_startedTimers[timerName] = m_time.elapsed();
+}
+
+qint64 ExecutionEngine::stopTimer(const QString &timerName, bool *wasRunning)
+{
+    if (!m_startedTimers.contains(timerName)) {
+        *wasRunning = false;
+        return 0;
+    }
+    *wasRunning = true;
+    qint64 startedAt = m_startedTimers.take(timerName);
+    return m_time.elapsed() - startedAt;
+}
+
+int ExecutionEngine::consoleCountHelper(const QString &file, quint16 line, quint16 column)
+{
+    const QString key = file + QString::number(line) + QString::number(column);
+    int number = m_consoleCount.value(key, 0);
+    number++;
+    m_consoleCount.insert(key, number);
+    return number;
+}
+
+void ExecutionEngine::setExtensionData(int index, Deletable *data)
+{
+    if (m_extensionData.count() <= index)
+        m_extensionData.resize(index + 1);
+
+    if (m_extensionData.at(index))
+        delete m_extensionData.at(index);
+
+    m_extensionData[index] = data;
+}
+
 // Converts a JS value to a meta-type.
 // data must point to a place that can store a value of the given type.
 // Returns true if conversion succeeded, false otherwise.
@@ -1996,4 +2193,23 @@ static QObject *qtObjectFromJS(QV4::ExecutionEngine *engine, const QV4::Value &v
     return wrapper->object();
 }
 
+struct QV4EngineRegistrationData
+{
+    QV4EngineRegistrationData() : extensionCount(0) {}
+
+    QMutex mutex;
+    int extensionCount;
+};
+Q_GLOBAL_STATIC(QV4EngineRegistrationData, registrationData);
+
+QMutex *ExecutionEngine::registrationMutex()
+{
+    return &registrationData()->mutex;
+}
+
+int ExecutionEngine::registerExtension()
+{
+    return registrationData()->extensionCount++;
+}
+
 QT_END_NAMESPACE
diff --git a/src/qml/jsruntime/qv4engine_p.h b/src/qml/jsruntime/qv4engine_p.h
index 4ce854bc52..0d113754c0 100644
--- a/src/qml/jsruntime/qv4engine_p.h
+++ b/src/qml/jsruntime/qv4engine_p.h
@@ -53,13 +53,16 @@
 #include "qv4global_p.h"
 #include "qv4managed_p.h"
 #include "qv4context_p.h"
+#include "qv4stackframe_p.h"
 #include <private/qintrusivelist_p.h>
 #include "qv4enginebase_p.h"
 #include <private/qqmlrefcount_p.h>
 #include <private/qqmljsengine_p.h>
+#include <private/qqmldelayedcallqueue_p.h>
+#include <QtCore/qelapsedtimer.h>
+#include <QtCore/qmutex.h>
 
 #include "qv4function_p.h"
-#include <private/qv8engine_p.h>
 #include <private/qv4compileddata_p.h>
 
 namespace WTF {
@@ -67,9 +70,65 @@ class BumpPointerAllocator;
 class PageAllocation;
 }
 
+#define V4_DEFINE_EXTENSION(dataclass, datafunction) \
+    static inline dataclass *datafunction(QV4::ExecutionEngine *engine) \
+    { \
+        static int extensionId = -1; \
+        if (extensionId == -1) { \
+            QV4::ExecutionEngine::registrationMutex()->lock(); \
+            if (extensionId == -1) \
+                extensionId = QV4::ExecutionEngine::registerExtension(); \
+            QV4::ExecutionEngine::registrationMutex()->unlock(); \
+        } \
+        dataclass *rv = (dataclass *)engine->extensionData(extensionId); \
+        if (!rv) { \
+            rv = new dataclass(engine); \
+            engine->setExtensionData(extensionId, rv); \
+        } \
+        return rv; \
+    } \
+
+
 QT_BEGIN_NAMESPACE
 
-class QV8Engine;
+namespace QV4 { struct QObjectMethod; }
+
+// Used to allow a QObject method take and return raw V4 handles without having to expose
+// 48 in the public API.
+// Use like this:
+//     class MyClass : public QObject {
+//         Q_OBJECT
+//         ...
+//         Q_INVOKABLE void myMethod(QQmlV4Function*);
+//     };
+// The QQmlV8Function - and consequently the arguments and return value - only remains
+// valid during the call.  If the return value isn't set within myMethod(), the will return
+// undefined.
+
+class QQmlV4Function
+{
+public:
+    int length() const { return callData->argc(); }
+    QV4::ReturnedValue operator[](int idx) const { return (idx < callData->argc() ? callData->args[idx].asReturnedValue() : QV4::Encode::undefined()); }
+    void setReturnValue(QV4::ReturnedValue rv) { *retVal = rv; }
+    QV4::ExecutionEngine *v4engine() const { return e; }
+private:
+    friend struct QV4::QObjectMethod;
+    QQmlV4Function();
+    QQmlV4Function(const QQmlV4Function &);
+    QQmlV4Function &operator=(const QQmlV4Function &);
+
+    QQmlV4Function(QV4::CallData *callData, QV4::Value *retVal, QV4::ExecutionEngine *e)
+        : callData(callData), retVal(retVal), e(e)
+    {
+        callData->thisObject = QV4::Encode::undefined();
+    }
+
+    QV4::CallData *callData;
+    QV4::Value *retVal;
+    QV4::ExecutionEngine *e;
+};
+
 class QQmlError;
 class QJSEngine;
 class QQmlEngine;
@@ -127,8 +186,7 @@ public:
     Function *globalCode;
 
     QJSEngine *jsEngine() const { return publicEngine; }
-    QQmlEngine *qmlEngine() const { return v8Engine ? v8Engine->engine() : nullptr; }
-    QV8Engine *v8Engine;
+    QQmlEngine *qmlEngine() const { return m_qmlEngine; }
     QJSEngine *publicEngine;
 
     enum JSObjects {
@@ -599,6 +657,44 @@ public:
     }
 
     QV4::ReturnedValue global();
+    void initQmlGlobalObject();
+    void initializeGlobal();
+
+    void freezeObject(const QV4::Value &value);
+
+    // Return the list of illegal id names (the names of the properties on the global object)
+    const QSet<QString> &illegalNames() const;
+
+#if QT_CONFIG(qml_xml_http_request)
+    void *xmlHttpRequestData() const { return m_xmlHttpRequestData; }
+#endif
+
+    void setQmlEngine(QQmlEngine *engine);
+
+    QQmlDelayedCallQueue *delayedCallQueue() { return &m_delayedCallQueue; }
+
+    // used for console.time(), console.timeEnd()
+    void startTimer(const QString &timerName);
+    qint64 stopTimer(const QString &timerName, bool *wasRunning);
+
+    // used for console.count()
+    int consoleCountHelper(const QString &file, quint16 line, quint16 column);
+
+    struct Deletable {
+        virtual ~Deletable() {}
+    };
+
+    static QMutex *registrationMutex();
+    static int registerExtension();
+
+    void setExtensionData(int, Deletable *);
+    Deletable *extensionData(int index) const
+    {
+        if (index < m_extensionData.count())
+            return m_extensionData[index];
+        else
+            return nullptr;
+    }
 
     double localTZA = 0.0; // local timezone, initialized at startup
 
@@ -616,10 +712,26 @@ private:
     QScopedPointer<QV4::Debugging::Debugger> m_debugger;
     QScopedPointer<QV4::Profiling::Profiler> m_profiler;
 #endif
+    QSet<QString> m_illegalNames;
     int jitCallCountThreshold;
 
     // used by generated Promise objects to handle 'then' events
     QScopedPointer<QV4::Promise::ReactionHandler> m_reactionHandler;
+
+#if QT_CONFIG(qml_xml_http_request)
+    void *m_xmlHttpRequestData;
+#endif
+
+    QQmlEngine *m_qmlEngine;
+
+    QQmlDelayedCallQueue m_delayedCallQueue;
+
+    QElapsedTimer m_time;
+    QHash<QString, qint64> m_startedTimers;
+
+    QHash<QString, quint32> m_consoleCount;
+
+    QVector<Deletable *> m_extensionData;
 };
 
 #define CHECK_STACK_LIMITS(v4) if ((v4)->checkStackLimits()) return Encode::undefined(); \
diff --git a/src/qml/jsruntime/qv4include.cpp b/src/qml/jsruntime/qv4include.cpp
index 3c732bc555..c0885a418c 100644
--- a/src/qml/jsruntime/qv4include.cpp
+++ b/src/qml/jsruntime/qv4include.cpp
@@ -72,13 +72,17 @@ QV4Include::QV4Include(const QUrl &url, QV4::ExecutionEngine *engine,
     m_resultObject.set(v4, resultValue(v4));
 
 #if QT_CONFIG(qml_network)
-    m_network = engine->v8Engine->networkAccessManager();
+    if (QQmlEngine *qmlEngine = engine->qmlEngine()) {
+        m_network = qmlEngine->networkAccessManager();
 
-    QNetworkRequest request;
-    request.setUrl(url);
+        QNetworkRequest request;
+        request.setUrl(url);
 
-    m_reply = m_network->get(request);
-    QObject::connect(m_reply, SIGNAL(finished()), this, SLOT(finished()));
+        m_reply = m_network->get(request);
+        QObject::connect(m_reply, SIGNAL(finished()), this, SLOT(finished()));
+    } else {
+        finished();
+    }
 #else
     finished();
 #endif
@@ -197,7 +201,7 @@ void QV4Include::finished()
 }
 
 /*
-    Documented in qv8engine.cpp
+    Documented in qv4engine.cpp
 */
 QV4::ReturnedValue QV4Include::method_include(const QV4::FunctionObject *b, const QV4::Value *, const QV4::Value *argv, int argc)
 {
diff --git a/src/qml/qml/qqmlcomponent.cpp b/src/qml/qml/qqmlcomponent.cpp
index 64d2a064df..f9f26b6b1e 100644
--- a/src/qml/qml/qqmlcomponent.cpp
+++ b/src/qml/qml/qqmlcomponent.cpp
@@ -72,7 +72,7 @@ namespace {
 
 QT_BEGIN_NAMESPACE
 
-class QQmlComponentExtension : public QV8Engine::Deletable
+class QQmlComponentExtension : public QV4::ExecutionEngine::Deletable
 {
 public:
     QQmlComponentExtension(QV4::ExecutionEngine *v4);
diff --git a/src/qml/qml/qqmlengine.cpp b/src/qml/qml/qqmlengine.cpp
index cb94ae379e..8bdbe0fc47 100644
--- a/src/qml/qml/qqmlengine.cpp
+++ b/src/qml/qml/qqmlengine.cpp
@@ -957,7 +957,7 @@ void QQmlEnginePrivate::init()
     qRegisterMetaType<QList<int> >();
     qRegisterMetaType<QQmlBinding*>();
 
-    v8engine()->setEngine(q);
+    q->handle()->setQmlEngine(q);
 
     rootContext = new QQmlContext(q,true);
 }
diff --git a/src/qml/qml/qqmlengine_p.h b/src/qml/qml/qqmlengine_p.h
index 6ef88404fd..668dfed91e 100644
--- a/src/qml/qml/qqmlengine_p.h
+++ b/src/qml/qml/qqmlengine_p.h
@@ -76,7 +76,6 @@
 
 #include <private/qobject_p.h>
 
-#include <private/qv8engine_p.h>
 #include <private/qjsengine_p.h>
 #include <private/qqmldirparser_p.h>
 
@@ -149,7 +148,6 @@ public:
     QQmlDelayedError *erroredBindings;
     int inProgressCreations;
 
-    QV8Engine *v8engine() const { return q_func()->handle()->v8Engine; }
     QV4::ExecutionEngine *v4engine() const { return q_func()->handle(); }
 
 #if QT_CONFIG(qml_worker_script)
@@ -240,7 +238,6 @@ public:
     static void warning(QQmlEnginePrivate *, const QQmlError &);
     static void warning(QQmlEnginePrivate *, const QList<QQmlError> &);
 
-    inline static QV8Engine *getV8Engine(QQmlEngine *e);
     inline static QV4::ExecutionEngine *getV4Engine(QQmlEngine *e);
     inline static QQmlEnginePrivate *get(QQmlEngine *e);
     inline static const QQmlEnginePrivate *get(const QQmlEngine *e);
@@ -388,13 +385,6 @@ QQmlPropertyCache *QQmlEnginePrivate::cache(const QQmlType &type, int minorVersi
     return QQmlMetaType::propertyCache(type, minorVersion);
 }
 
-QV8Engine *QQmlEnginePrivate::getV8Engine(QQmlEngine *e)
-{
-    Q_ASSERT(e);
-
-    return e->handle()->v8Engine;
-}
-
 QV4::ExecutionEngine *QQmlEnginePrivate::getV4Engine(QQmlEngine *e)
 {
     Q_ASSERT(e);
diff --git a/src/qml/qml/qqmlglobal_p.h b/src/qml/qml/qqmlglobal_p.h
index 53caffe040..136159993a 100644
--- a/src/qml/qml/qqmlglobal_p.h
+++ b/src/qml/qml/qqmlglobal_p.h
@@ -55,7 +55,6 @@
 #include <QtCore/QObject>
 #include <private/qqmlmetaobject_p.h>
 #include <private/qmetaobject_p.h>
-#include <private/qv8engine_p.h>
 
 QT_BEGIN_NAMESPACE
 
diff --git a/src/qml/qml/qqmllocale.cpp b/src/qml/qml/qqmllocale.cpp
index 2b17037df0..dca13ac8d4 100644
--- a/src/qml/qml/qqmllocale.cpp
+++ b/src/qml/qml/qqmllocale.cpp
@@ -662,7 +662,7 @@ LOCALE_STRING_PROPERTY(exponential)
 LOCALE_STRING_PROPERTY(amText)
 LOCALE_STRING_PROPERTY(pmText)
 
-class QV4LocaleDataDeletable : public QV8Engine::Deletable
+class QV4LocaleDataDeletable : public QV4::ExecutionEngine::Deletable
 {
 public:
     QV4LocaleDataDeletable(QV4::ExecutionEngine *engine);
diff --git a/src/qml/qml/qqmlpropertycache.cpp b/src/qml/qml/qqmlpropertycache.cpp
index a6546ae330..48c4216d54 100644
--- a/src/qml/qml/qqmlpropertycache.cpp
+++ b/src/qml/qml/qqmlpropertycache.cpp
@@ -868,7 +868,7 @@ QQmlPropertyCacheMethodArguments *QQmlPropertyCache::createArgumentsObject(int a
 QString QQmlPropertyCache::signalParameterStringForJS(QV4::ExecutionEngine *engine, const QList<QByteArray> &parameterNameList, QString *errorString)
 {
     bool unnamedParameter = false;
-    const QSet<QString> &illegalNames = engine->v8Engine->illegalNames();
+    const QSet<QString> &illegalNames = engine->illegalNames();
     QString parameters;
 
     for (int i = 0; i < parameterNameList.count(); ++i) {
diff --git a/src/qml/qml/qqmltypeloader.cpp b/src/qml/qml/qqmltypeloader.cpp
index a953e677fa..d694909c7c 100644
--- a/src/qml/qml/qqmltypeloader.cpp
+++ b/src/qml/qml/qqmltypeloader.cpp
@@ -2516,7 +2516,7 @@ bool QQmlTypeData::loadFromSource()
     m_document.reset(new QmlIR::Document(isDebugging()));
     m_document->jsModule.sourceTimeStamp = m_backupSourceCode.sourceTimeStamp();
     QQmlEngine *qmlEngine = typeLoader()->engine();
-    QmlIR::IRBuilder compiler(qmlEngine->handle()->v8Engine->illegalNames());
+    QmlIR::IRBuilder compiler(qmlEngine->handle()->illegalNames());
 
     QString sourceError;
     const QString source = m_backupSourceCode.readAll(&sourceError);
diff --git a/src/qml/qml/qqmlvaluetype.cpp b/src/qml/qml/qqmlvaluetype.cpp
index f08005fd20..fce753cd26 100644
--- a/src/qml/qml/qqmlvaluetype.cpp
+++ b/src/qml/qml/qqmlvaluetype.cpp
@@ -39,6 +39,7 @@
 
 #include "qqmlvaluetype_p.h"
 
+#include <QtCore/qmutex.h>
 #include <private/qqmlglobal_p.h>
 #include <QtCore/qdebug.h>
 #include <private/qmetaobjectbuilder_p.h>
diff --git a/src/qml/qml/qqmlxmlhttprequest.cpp b/src/qml/qml/qqmlxmlhttprequest.cpp
index c6b7f2ab3f..b435f8ef66 100644
--- a/src/qml/qml/qqmlxmlhttprequest.cpp
+++ b/src/qml/qml/qqmlxmlhttprequest.cpp
@@ -95,7 +95,7 @@ struct QQmlXMLHttpRequestData {
 
 static inline QQmlXMLHttpRequestData *xhrdata(ExecutionEngine *v4)
 {
-    return (QQmlXMLHttpRequestData *)v4->v8Engine->xmlHttpRequestData();
+    return (QQmlXMLHttpRequestData *)v4->xmlHttpRequestData();
 }
 
 QQmlXMLHttpRequestData::QQmlXMLHttpRequestData()
@@ -591,7 +591,7 @@ ReturnedValue NodePrototype::getProto(ExecutionEngine *v4)
     if (d->nodePrototype.isUndefined()) {
         ScopedObject p(scope, v4->memoryManager->allocate<NodePrototype>());
         d->nodePrototype.set(v4, p);
-        v4->v8Engine->freezeObject(p);
+        v4->freezeObject(p);
     }
     return d->nodePrototype.value();
 }
@@ -640,7 +640,7 @@ ReturnedValue Element::prototype(ExecutionEngine *engine)
         p->setPrototypeUnchecked((pp = NodePrototype::getProto(engine)));
         p->defineAccessorProperty(QStringLiteral("tagName"), NodePrototype::method_get_nodeName, nullptr);
         d->elementPrototype.set(engine, p);
-        engine->v8Engine->freezeObject(p);
+        engine->freezeObject(p);
     }
     return d->elementPrototype.value();
 }
@@ -657,7 +657,7 @@ ReturnedValue Attr::prototype(ExecutionEngine *engine)
         p->defineAccessorProperty(QStringLiteral("value"), method_value, nullptr);
         p->defineAccessorProperty(QStringLiteral("ownerElement"), method_ownerElement, nullptr);
         d->attrPrototype.set(engine, p);
-        engine->v8Engine->freezeObject(p);
+        engine->freezeObject(p);
     }
     return d->attrPrototype.value();
 }
@@ -713,7 +713,7 @@ ReturnedValue CharacterData::prototype(ExecutionEngine *v4)
         p->defineAccessorProperty(QStringLiteral("data"), NodePrototype::method_get_nodeValue, nullptr);
         p->defineAccessorProperty(QStringLiteral("length"), method_length, nullptr);
         d->characterDataPrototype.set(v4, p);
-        v4->v8Engine->freezeObject(p);
+        v4->freezeObject(p);
     }
     return d->characterDataPrototype.value();
 }
@@ -749,7 +749,7 @@ ReturnedValue Text::prototype(ExecutionEngine *v4)
         p->defineAccessorProperty(QStringLiteral("isElementContentWhitespace"), method_isElementContentWhitespace, nullptr);
         p->defineAccessorProperty(QStringLiteral("wholeText"), method_wholeText, nullptr);
         d->textPrototype.set(v4, p);
-        v4->v8Engine->freezeObject(p);
+        v4->freezeObject(p);
     }
     return d->textPrototype.value();
 }
@@ -764,7 +764,7 @@ ReturnedValue CDATA::prototype(ExecutionEngine *v4)
         ScopedObject pp(scope);
         p->setPrototypeUnchecked((pp = Text::prototype(v4)));
         d->cdataPrototype.set(v4, p);
-        v4->v8Engine->freezeObject(p);
+        v4->freezeObject(p);
     }
     return d->cdataPrototype.value();
 }
@@ -782,7 +782,7 @@ ReturnedValue Document::prototype(ExecutionEngine *v4)
         p->defineAccessorProperty(QStringLiteral("xmlStandalone"), method_xmlStandalone, nullptr);
         p->defineAccessorProperty(QStringLiteral("documentElement"), method_documentElement, nullptr);
         d->documentPrototype.set(v4, p);
-        v4->v8Engine->freezeObject(p);
+        v4->freezeObject(p);
     }
     return d->documentPrototype.value();
 }
@@ -1646,7 +1646,7 @@ struct QQmlXMLHttpRequestCtor : public FunctionObject
         Scope scope(f->engine());
         const QQmlXMLHttpRequestCtor *ctor = static_cast<const QQmlXMLHttpRequestCtor *>(f);
 
-        QQmlXMLHttpRequest *r = new QQmlXMLHttpRequest(scope.engine->v8Engine->networkAccessManager(), scope.engine);
+        QQmlXMLHttpRequest *r = new QQmlXMLHttpRequest(scope.engine->qmlEngine()->networkAccessManager(), scope.engine);
         Scoped<QQmlXMLHttpRequestWrapper> w(scope, scope.engine->memoryManager->allocate<QQmlXMLHttpRequestWrapper>(r));
         ScopedObject proto(scope, ctor->d()->proto);
         w->setPrototypeUnchecked(proto);
diff --git a/src/qml/qml/v8/qqmlbuiltinfunctions.cpp b/src/qml/qml/v8/qqmlbuiltinfunctions.cpp
index 3bc588b50e..532bfa8754 100644
--- a/src/qml/qml/v8/qqmlbuiltinfunctions.cpp
+++ b/src/qml/qml/v8/qqmlbuiltinfunctions.cpp
@@ -47,7 +47,6 @@
 #if QT_CONFIG(qml_locale)
 #include <private/qqmllocale_p.h>
 #endif
-#include <private/qv8engine_p.h>
 #include <private/qqmldelayedcallqueue_p.h>
 #include <QFileInfo>
 
@@ -1684,10 +1683,8 @@ ReturnedValue ConsoleObject::method_time(const FunctionObject *b, const Value *,
     if (argc != 1)
         THROW_GENERIC_ERROR("console.time(): Invalid arguments");
 
-    QV8Engine *v8engine = scope.engine->v8Engine;
-
     QString name = argv[0].toQStringNoThrow();
-    v8engine->startTimer(name);
+    scope.engine->startTimer(name);
     return QV4::Encode::undefined();
 }
 
@@ -1697,11 +1694,9 @@ ReturnedValue ConsoleObject::method_timeEnd(const FunctionObject *b, const Value
     if (argc != 1)
         THROW_GENERIC_ERROR("console.timeEnd(): Invalid arguments");
 
-    QV8Engine *v8engine = scope.engine->v8Engine;
-
     QString name = argv[0].toQStringNoThrow();
     bool wasRunning;
-    qint64 elapsed = v8engine->stopTimer(name, &wasRunning);
+    qint64 elapsed = scope.engine->stopTimer(name, &wasRunning);
     if (wasRunning) {
         qDebug("%s: %llims", qPrintable(name), elapsed);
     }
@@ -1717,13 +1712,12 @@ ReturnedValue ConsoleObject::method_count(const FunctionObject *b, const Value *
 
     Scope scope(b);
     QV4::ExecutionEngine *v4 = scope.engine;
-    QV8Engine *v8engine = scope.engine->v8Engine;
 
     QV4::CppStackFrame *frame = v4->currentStackFrame;
 
     QString scriptName = frame->source();
 
-    int value = v8engine->consoleCountHelper(scriptName, frame->lineNumber(), 0);
+    int value = v4->consoleCountHelper(scriptName, frame->lineNumber(), 0);
     QString message = name + QLatin1String(": ") + QString::number(value);
 
     QMessageLogger(qPrintable(scriptName), frame->lineNumber(),
@@ -2147,8 +2141,7 @@ function.
 */
 ReturnedValue QtObject::method_callLater(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
 {
-    QV8Engine *v8engine = b->engine()->v8Engine;
-    return v8engine->delayedCallQueue()->addUniquelyAndExecuteLater(b, thisObject, argv, argc);
+    return b->engine()->delayedCallQueue()->addUniquelyAndExecuteLater(b, thisObject, argv, argc);
 }
 
 QT_END_NAMESPACE
diff --git a/src/qml/qml/v8/qv8engine.cpp b/src/qml/qml/v8/qv8engine.cpp
deleted file mode 100644
index d76344b613..0000000000
--- a/src/qml/qml/v8/qv8engine.cpp
+++ /dev/null
@@ -1,331 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the QtQml module of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU Lesser
-** General Public License version 3 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL3 included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU Lesser General Public License version 3 requirements
-** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 2.0 or (at your option) the GNU General
-** Public license version 3 or any later version approved by the KDE Free
-** Qt Foundation. The licenses are as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
-** included in the packaging of this file. Please review the following
-** information to ensure the GNU General Public License requirements will
-** be met: https://www.gnu.org/licenses/gpl-2.0.html and
-** https://www.gnu.org/licenses/gpl-3.0.html.
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#include "qv8engine_p.h"
-
-#if QT_CONFIG(qml_sequence_object)
-#include "qv4sequenceobject_p.h"
-#endif
-
-#include "private/qjsengine_p.h"
-
-#include <private/qqmlbuiltinfunctions_p.h>
-#include <private/qqmllist_p.h>
-#include <private/qqmlengine_p.h>
-#if QT_CONFIG(qml_xml_http_request)
-#include <private/qqmlxmlhttprequest_p.h>
-#endif
-#if QT_CONFIG(qml_locale)
-#include <private/qqmllocale_p.h>
-#endif
-#include <private/qqmlglobal_p.h>
-#include <private/qqmlmemoryprofiler_p.h>
-#include <private/qqmlplatform_p.h>
-#include <private/qjsvalue_p.h>
-#include <private/qqmltypewrapper_p.h>
-#include <private/qqmlvaluetypewrapper_p.h>
-#include <private/qqmllistwrapper_p.h>
-#include <private/qv4scopedvalue_p.h>
-
-#include "qv4domerrors_p.h"
-#include "qv4sqlerrors_p.h"
-
-#include <QtCore/qjsonarray.h>
-#include <QtCore/qjsonobject.h>
-#include <QtCore/qjsonvalue.h>
-#include <QtCore/qdatetime.h>
-#include <QtCore/qdatastream.h>
-#include <private/qsimd_p.h>
-
-#include <private/qv4value_p.h>
-#include <private/qv4dateobject_p.h>
-#include <private/qv4objectiterator_p.h>
-#include <private/qv4qobjectwrapper_p.h>
-#include <private/qv4mm_p.h>
-#include <private/qv4objectproto_p.h>
-#include <private/qv4globalobject_p.h>
-#include <private/qv4regexpobject_p.h>
-#include <private/qv4variantobject_p.h>
-#include <private/qv4script_p.h>
-#include <private/qv4include_p.h>
-#include <private/qv4jsonobject_p.h>
-#include <private/qv4identifiertable_p.h>
-
-Q_DECLARE_METATYPE(QList<int>)
-
-
-// XXX TODO: Need to check all the global functions will also work in a worker script where the
-// QQmlEngine is not available
-QT_BEGIN_NAMESPACE
-
-template <typename ReturnType>
-ReturnType convertJSValueToVariantType(const QJSValue &value)
-{
-    return value.toVariant().value<ReturnType>();
-}
-
-static void saveJSValue(QDataStream &stream, const void *data)
-{
-    const QJSValue *jsv = reinterpret_cast<const QJSValue *>(data);
-    quint32 isNullOrUndefined = 0;
-    if (jsv->isNull())
-        isNullOrUndefined |= 0x1;
-    if (jsv->isUndefined())
-        isNullOrUndefined |= 0x2;
-    stream << isNullOrUndefined;
-    if (!isNullOrUndefined)
-        reinterpret_cast<const QJSValue*>(data)->toVariant().save(stream);
-}
-
-static void restoreJSValue(QDataStream &stream, void *data)
-{
-    QJSValue *jsv = reinterpret_cast<QJSValue*>(data);
-
-    quint32 isNullOrUndefined;
-    stream >> isNullOrUndefined;
-
-    if (isNullOrUndefined & 0x1) {
-        *jsv = QJSValue(QJSValue::NullValue);
-    } else if (isNullOrUndefined & 0x2) {
-        *jsv = QJSValue();
-    } else {
-        QVariant v;
-        v.load(stream);
-        QJSValuePrivate::setVariant(jsv, v);
-    }
-}
-
-QV8Engine::QV8Engine(QV4::ExecutionEngine *v4)
-    : m_engine(nullptr)
-    , m_v4Engine(v4)
-#if QT_CONFIG(qml_xml_http_request)
-    , m_xmlHttpRequestData(nullptr)
-#endif
-{
-#ifndef Q_OS_WASM // wasm does not have working simd QTBUG-63924
-#ifdef Q_PROCESSOR_X86_32
-    if (!qCpuHasFeature(SSE2)) {
-        qFatal("This program requires an X86 processor that supports SSE2 extension, at least a Pentium 4 or newer");
-    }
-#endif
-#endif
-
-    QML_MEMORY_SCOPE_STRING("QV8Engine::QV8Engine");
-    qMetaTypeId<QJSValue>();
-    qMetaTypeId<QList<int> >();
-
-    if (!QMetaType::hasRegisteredConverterFunction<QJSValue, QVariantMap>())
-        QMetaType::registerConverter<QJSValue, QVariantMap>(convertJSValueToVariantType<QVariantMap>);
-    if (!QMetaType::hasRegisteredConverterFunction<QJSValue, QVariantList>())
-        QMetaType::registerConverter<QJSValue, QVariantList>(convertJSValueToVariantType<QVariantList>);
-    if (!QMetaType::hasRegisteredConverterFunction<QJSValue, QStringList>())
-        QMetaType::registerConverter<QJSValue, QStringList>(convertJSValueToVariantType<QStringList>);
-    QMetaType::registerStreamOperators(qMetaTypeId<QJSValue>(), saveJSValue, restoreJSValue);
-
-    m_delayedCallQueue.init(m_v4Engine);
-
-    QV4::QObjectWrapper::initializeBindings(m_v4Engine);
-}
-
-QV8Engine::~QV8Engine()
-{
-    qDeleteAll(m_extensionData);
-    m_extensionData.clear();
-
-#if QT_CONFIG(qml_xml_http_request)
-    qt_rem_qmlxmlhttprequest(m_v4Engine, m_xmlHttpRequestData);
-    m_xmlHttpRequestData = nullptr;
-#endif
-}
-
-#if QT_CONFIG(qml_network)
-QNetworkAccessManager *QV8Engine::networkAccessManager()
-{
-    return QQmlEnginePrivate::get(m_engine)->getNetworkAccessManager();
-}
-#endif
-
-const QSet<QString> &QV8Engine::illegalNames() const
-{
-    return m_illegalNames;
-}
-
-void QV8Engine::initializeGlobal()
-{
-    QV4::Scope scope(m_v4Engine);
-    QV4::GlobalExtensions::init(m_v4Engine->globalObject, QJSEngine::AllExtensions);
-
-    QV4::ScopedObject qt(scope, m_v4Engine->memoryManager->allocate<QV4::QtObject>(m_engine));
-    m_v4Engine->globalObject->defineDefaultProperty(QStringLiteral("Qt"), qt);
-
-#if QT_CONFIG(qml_locale)
-    QQmlLocale::registerStringLocaleCompare(m_v4Engine);
-    QQmlDateExtension::registerExtension(m_v4Engine);
-    QQmlNumberExtension::registerExtension(m_v4Engine);
-#endif
-
-#if QT_CONFIG(qml_xml_http_request)
-    qt_add_domexceptions(m_v4Engine);
-    m_xmlHttpRequestData = qt_add_qmlxmlhttprequest(m_v4Engine);
-#endif
-
-    qt_add_sqlexceptions(m_v4Engine);
-
-    {
-        for (uint i = 0; i < m_v4Engine->globalObject->internalClass()->size; ++i) {
-            if (m_v4Engine->globalObject->internalClass()->nameMap.at(i).isString()) {
-                QV4::PropertyKey id = m_v4Engine->globalObject->internalClass()->nameMap.at(i);
-                m_illegalNames.insert(id.toQString());
-            }
-        }
-    }
-}
-
-static void freeze_recursive(QV4::ExecutionEngine *v4, QV4::Object *object)
-{
-    if (object->as<QV4::QObjectWrapper>())
-        return;
-
-    QV4::Scope scope(v4);
-
-    bool instanceOfObject = false;
-    QV4::ScopedObject p(scope, object->getPrototypeOf());
-    while (p) {
-        if (p->d() == v4->objectPrototype()->d()) {
-            instanceOfObject = true;
-            break;
-        }
-        p = p->getPrototypeOf();
-    }
-    if (!instanceOfObject)
-        return;
-
-    QV4::Heap::InternalClass *frozen = object->internalClass()->propertiesFrozen();
-    if (object->internalClass() == frozen)
-        return;
-    object->setInternalClass(frozen);
-
-    QV4::ScopedObject o(scope);
-    for (uint i = 0; i < frozen->size; ++i) {
-        if (!frozen->nameMap.at(i).isStringOrSymbol())
-            continue;
-        o = *object->propertyData(i);
-        if (o)
-            freeze_recursive(v4, o);
-    }
-}
-
-void QV8Engine::freezeObject(const QV4::Value &value)
-{
-    QV4::Scope scope(m_v4Engine);
-    QV4::ScopedObject o(scope, value);
-    freeze_recursive(m_v4Engine, o);
-}
-
-struct QV8EngineRegistrationData
-{
-    QV8EngineRegistrationData() : extensionCount(0) {}
-
-    QMutex mutex;
-    int extensionCount;
-};
-Q_GLOBAL_STATIC(QV8EngineRegistrationData, registrationData);
-
-QMutex *QV8Engine::registrationMutex()
-{
-    return &registrationData()->mutex;
-}
-
-int QV8Engine::registerExtension()
-{
-    return registrationData()->extensionCount++;
-}
-
-void QV8Engine::setExtensionData(int index, Deletable *data)
-{
-    if (m_extensionData.count() <= index)
-        m_extensionData.resize(index + 1);
-
-    if (m_extensionData.at(index))
-        delete m_extensionData.at(index);
-
-    m_extensionData[index] = data;
-}
-
-void QV8Engine::initQmlGlobalObject()
-{
-    initializeGlobal();
-    freezeObject(*m_v4Engine->globalObject);
-}
-
-void QV8Engine::setEngine(QQmlEngine *engine)
-{
-    m_engine = engine;
-    initQmlGlobalObject();
-}
-
-void QV8Engine::startTimer(const QString &timerName)
-{
-    if (!m_time.isValid())
-        m_time.start();
-    m_startedTimers[timerName] = m_time.elapsed();
-}
-
-qint64 QV8Engine::stopTimer(const QString &timerName, bool *wasRunning)
-{
-    if (!m_startedTimers.contains(timerName)) {
-        *wasRunning = false;
-        return 0;
-    }
-    *wasRunning = true;
-    qint64 startedAt = m_startedTimers.take(timerName);
-    return m_time.elapsed() - startedAt;
-}
-
-int QV8Engine::consoleCountHelper(const QString &file, quint16 line, quint16 column)
-{
-    const QString key = file + QString::number(line) + QString::number(column);
-    int number = m_consoleCount.value(key, 0);
-    number++;
-    m_consoleCount.insert(key, number);
-    return number;
-}
-
-QT_END_NAMESPACE
-
diff --git a/src/qml/qml/v8/qv8engine_p.h b/src/qml/qml/v8/qv8engine_p.h
deleted file mode 100644
index f9b69cfacc..0000000000
--- a/src/qml/qml/v8/qv8engine_p.h
+++ /dev/null
@@ -1,228 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the QtQml module of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU Lesser
-** General Public License version 3 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL3 included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU Lesser General Public License version 3 requirements
-** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 2.0 or (at your option) the GNU General
-** Public license version 3 or any later version approved by the KDE Free
-** Qt Foundation. The licenses are as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
-** included in the packaging of this file. Please review the following
-** information to ensure the GNU General Public License requirements will
-** be met: https://www.gnu.org/licenses/gpl-2.0.html and
-** https://www.gnu.org/licenses/gpl-3.0.html.
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#ifndef QQMLV8ENGINE_P_H
-#define QQMLV8ENGINE_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 <QtCore/qglobal.h>
-#include <QtCore/qvariant.h>
-#include <QtCore/qset.h>
-#include <QtCore/qmutex.h>
-#include <QtCore/qstack.h>
-#include <QtCore/qstringlist.h>
-#include <QtCore/QElapsedTimer>
-#include <QtCore/QThreadStorage>
-
-#include <QtQml/qjsengine.h>
-#include "private/qintrusivelist_p.h"
-
-
-#include <private/qv4value_p.h>
-#include <private/qv4identifier_p.h>
-#include <private/qv4context_p.h>
-#include <private/qv4stackframe_p.h>
-#include <private/qqmldelayedcallqueue_p.h>
-
-QT_BEGIN_NAMESPACE
-
-namespace QV4 {
-    struct ArrayObject;
-    struct ExecutionEngine;
-    struct QObjectMethod;
-}
-
-#define V4_DEFINE_EXTENSION(dataclass, datafunction) \
-    static inline dataclass *datafunction(QV4::ExecutionEngine *engine) \
-    { \
-        static int extensionId = -1; \
-        if (extensionId == -1) { \
-            QV8Engine::registrationMutex()->lock(); \
-            if (extensionId == -1) \
-                extensionId = QV8Engine::registerExtension(); \
-            QV8Engine::registrationMutex()->unlock(); \
-        } \
-        dataclass *rv = (dataclass *)engine->v8Engine->extensionData(extensionId); \
-        if (!rv) { \
-            rv = new dataclass(engine); \
-            engine->v8Engine->setExtensionData(extensionId, rv); \
-        } \
-        return rv; \
-    } \
-
-// Used to allow a QObject method take and return raw V4 handles without having to expose
-// 48 in the public API.
-// Use like this:
-//     class MyClass : public QObject {
-//         Q_OBJECT
-//         ...
-//         Q_INVOKABLE void myMethod(QQmlV4Function*);
-//     };
-// The QQmlV8Function - and consequently the arguments and return value - only remains
-// valid during the call.  If the return value isn't set within myMethod(), the will return
-// undefined.
-
-class QQmlV4Function
-{
-public:
-    int length() const { return callData->argc(); }
-    QV4::ReturnedValue operator[](int idx) const { return (idx < callData->argc() ? callData->args[idx].asReturnedValue() : QV4::Encode::undefined()); }
-    void setReturnValue(QV4::ReturnedValue rv) { *retVal = rv; }
-    QV4::ExecutionEngine *v4engine() const { return e; }
-private:
-    friend struct QV4::QObjectMethod;
-    QQmlV4Function();
-    QQmlV4Function(const QQmlV4Function &);
-    QQmlV4Function &operator=(const QQmlV4Function &);
-
-    QQmlV4Function(QV4::CallData *callData, QV4::Value *retVal, QV4::ExecutionEngine *e)
-        : callData(callData), retVal(retVal), e(e)
-    {
-        callData->thisObject = QV4::Encode::undefined();
-    }
-
-    QV4::CallData *callData;
-    QV4::Value *retVal;
-    QV4::ExecutionEngine *e;
-};
-
-class QObject;
-class QQmlEngine;
-class QNetworkAccessManager;
-class QQmlContextData;
-
-class Q_QML_PRIVATE_EXPORT QV8Engine
-{
-    friend class QJSEngine;
-public:
-//    static QJSEngine* get(QV8Engine* d) { Q_ASSERT(d); return d->q; }
-    static QV4::ExecutionEngine *getV4(QV8Engine *d) { return d->m_v4Engine; }
-
-    QV8Engine(QV4::ExecutionEngine *v4);
-    virtual ~QV8Engine();
-
-    // This enum should be in sync with QQmlEngine::ObjectOwnership
-    enum ObjectOwnership { CppOwnership, JavaScriptOwnership };
-
-    struct Deletable {
-        virtual ~Deletable() {}
-    };
-
-    void initQmlGlobalObject();
-    void setEngine(QQmlEngine *engine);
-    QQmlEngine *engine() { return m_engine; }
-    QQmlDelayedCallQueue *delayedCallQueue() { return &m_delayedCallQueue; }
-
-#if QT_CONFIG(qml_xml_http_request)
-    void *xmlHttpRequestData() const { return m_xmlHttpRequestData; }
-#endif
-
-    void freezeObject(const QV4::Value &value);
-
-#if QT_CONFIG(qml_network)
-    // Return the network access manager for this engine.  By default this returns the network
-    // access manager of the QQmlEngine.  It is overridden in the case of a threaded v8
-    // instance (like in WorkerScript).
-    virtual QNetworkAccessManager *networkAccessManager();
-#endif
-
-    // Return the list of illegal id names (the names of the properties on the global object)
-    const QSet<QString> &illegalNames() const;
-
-    static QMutex *registrationMutex();
-    static int registerExtension();
-
-    inline Deletable *extensionData(int) const;
-    void setExtensionData(int, Deletable *);
-
-public:
-    // used for console.time(), console.timeEnd()
-    void startTimer(const QString &timerName);
-    qint64 stopTimer(const QString &timerName, bool *wasRunning);
-
-    // used for console.count()
-    int consoleCountHelper(const QString &file, quint16 line, quint16 column);
-
-protected:
-    QQmlEngine *m_engine;
-    QQmlDelayedCallQueue m_delayedCallQueue;
-
-    QV4::ExecutionEngine *m_v4Engine;
-
-#if QT_CONFIG(qml_xml_http_request)
-    void *m_xmlHttpRequestData;
-#endif
-
-    QVector<Deletable *> m_extensionData;
-
-    QSet<QString> m_illegalNames;
-
-    QElapsedTimer m_time;
-    QHash<QString, qint64> m_startedTimers;
-
-    QHash<QString, quint32> m_consoleCount;
-
-    void initializeGlobal();
-
-private:
-    Q_DISABLE_COPY(QV8Engine)
-};
-
-inline QV8Engine::Deletable *QV8Engine::extensionData(int index) const
-{
-    if (index < m_extensionData.count())
-        return m_extensionData[index];
-    else
-        return nullptr;
-}
-
-
-QT_END_NAMESPACE
-
-#endif // QQMLV8ENGINE_P_H
diff --git a/src/qml/qml/v8/v8.pri b/src/qml/qml/v8/v8.pri
index 4592022939..fbcc47de0c 100644
--- a/src/qml/qml/v8/v8.pri
+++ b/src/qml/qml/v8/v8.pri
@@ -1,11 +1,9 @@
 HEADERS += \
-    $$PWD/qv8engine_p.h \
     $$PWD/qv4domerrors_p.h \
     $$PWD/qv4sqlerrors_p.h \
     $$PWD/qqmlbuiltinfunctions_p.h
 
 SOURCES += \
-    $$PWD/qv8engine.cpp \
     $$PWD/qv4domerrors.cpp \
     $$PWD/qv4sqlerrors.cpp \
     $$PWD/qqmlbuiltinfunctions.cpp
diff --git a/src/qml/qtqmlglobal.h b/src/qml/qtqmlglobal.h
index a111f72e81..3e275c6359 100644
--- a/src/qml/qtqmlglobal.h
+++ b/src/qml/qtqmlglobal.h
@@ -54,6 +54,8 @@
 #  define QT_FEATURE_qml_debug -1
 #  define QT_FEATURE_qml_sequence_object 1
 #  define QT_FEATURE_qml_jit -1
+#  define QT_FEATURE_qml_worker_script -1
+#  define QT_FEATURE_qml_xml_http_request -1
 #endif
 
 QT_BEGIN_NAMESPACE
diff --git a/src/qmlmodels/qqmladaptormodel.cpp b/src/qmlmodels/qqmladaptormodel.cpp
index f991ae0a69..0bc67e1aad 100644
--- a/src/qmlmodels/qqmladaptormodel.cpp
+++ b/src/qmlmodels/qqmladaptormodel.cpp
@@ -48,7 +48,7 @@
 
 QT_BEGIN_NAMESPACE
 
-class QQmlAdaptorModelEngineData : public QV8Engine::Deletable
+class QQmlAdaptorModelEngineData : public QV4::ExecutionEngine::Deletable
 {
 public:
     QQmlAdaptorModelEngineData(QV4::ExecutionEngine *v4);
diff --git a/src/qmlmodels/qqmldelegatemodel.cpp b/src/qmlmodels/qqmldelegatemodel.cpp
index 742c164508..2216e5fb50 100644
--- a/src/qmlmodels/qqmldelegatemodel.cpp
+++ b/src/qmlmodels/qqmldelegatemodel.cpp
@@ -123,7 +123,7 @@ DEFINE_OBJECT_VTABLE(QV4::DelegateModelGroupFunction);
 
 
 
-class QQmlDelegateModelEngineData : public QV8Engine::Deletable
+class QQmlDelegateModelEngineData : public QV4::ExecutionEngine::Deletable
 {
 public:
     QQmlDelegateModelEngineData(QV4::ExecutionEngine *v4);
diff --git a/src/qmlmodels/qqmllistmodelworkeragent_p.h b/src/qmlmodels/qqmllistmodelworkeragent_p.h
index f79c0c557a..1ef27cea3f 100644
--- a/src/qmlmodels/qqmllistmodelworkeragent_p.h
+++ b/src/qmlmodels/qqmllistmodelworkeragent_p.h
@@ -57,7 +57,7 @@
 #include <QMutex>
 #include <QWaitCondition>
 
-#include <private/qv8engine_p.h>
+#include <private/qv4engine_p.h>
 
 QT_REQUIRE_CONFIG(qml_list_model);
 
diff --git a/src/qmlworkerscript/qquickworkerscript.cpp b/src/qmlworkerscript/qquickworkerscript.cpp
index 273ec2a7a6..4da1def5f5 100644
--- a/src/qmlworkerscript/qquickworkerscript.cpp
+++ b/src/qmlworkerscript/qquickworkerscript.cpp
@@ -57,7 +57,6 @@
 #include "qqmlnetworkaccessmanagerfactory.h"
 #endif
 
-#include <private/qv8engine_p.h>
 #include <private/qv4serialize_p.h>
 
 #include <private/qv4value_p.h>
@@ -125,6 +124,15 @@ private:
     QQmlError m_error;
 };
 
+struct WorkerScript : public QV4::ExecutionEngine {
+    WorkerScript(int id, QQuickWorkerScriptEnginePrivate *parent);
+
+    QQuickWorkerScriptEnginePrivate *p = nullptr;
+    QUrl source;
+    QQuickWorkerScript *owner = nullptr;
+    int id = -1;
+};
+
 class QQuickWorkerScriptEnginePrivate : public QObject
 {
     Q_OBJECT
@@ -140,23 +148,6 @@ public:
     QMutex m_lock;
     QWaitCondition m_wait;
 
-    struct WorkerScript : public QV8Engine {
-        WorkerScript(int id, QQuickWorkerScriptEnginePrivate *parent);
-        ~WorkerScript() override;
-
-#if QT_CONFIG(qml_network)
-        QNetworkAccessManager *networkAccessManager() override;
-#endif
-
-        QQuickWorkerScriptEnginePrivate *p = nullptr;
-        QUrl source;
-        QQuickWorkerScript *owner = nullptr;
-#if QT_CONFIG(qml_network)
-        QScopedPointer<QNetworkAccessManager> accessManager;
-#endif
-        int id = -1;
-    };
-
     QHash<int, WorkerScript *> workers;
     QV4::ReturnedValue getWorker(WorkerScript *);
 
@@ -185,7 +176,7 @@ QV4::ReturnedValue QQuickWorkerScriptEnginePrivate::method_sendMessage(const QV4
                                                                        const QV4::Value *, const QV4::Value *argv, int argc)
 {
     QV4::Scope scope(b);
-    WorkerScript *script = static_cast<WorkerScript *>(scope.engine->v8Engine);
+    WorkerScript *script = static_cast<WorkerScript *>(scope.engine);
 
     QV4::ScopedValue v(scope, argc > 0 ? argv[0] : QV4::Value::undefinedValue());
     QByteArray data = QV4::Serialize::serialize(v, scope.engine);
@@ -230,21 +221,20 @@ void QQuickWorkerScriptEnginePrivate::processMessage(int id, const QByteArray &d
     if (!script)
         return;
 
-    QV4::ExecutionEngine *v4 = QV8Engine::getV4(script);
-    QV4::Scope scope(v4);
+    QV4::Scope scope(script);
     QV4::ScopedString v(scope);
-    QV4::ScopedObject worker(scope, v4->globalObject->get((v = v4->newString(QStringLiteral("WorkerScript")))));
+    QV4::ScopedObject worker(scope, script->globalObject->get((v = script->newString(QStringLiteral("WorkerScript")))));
     QV4::ScopedFunctionObject onmessage(scope);
     if (worker)
-        onmessage = worker->get((v = v4->newString(QStringLiteral("onMessage"))));
+        onmessage = worker->get((v = script->newString(QStringLiteral("onMessage"))));
 
     if (!onmessage)
         return;
 
-    QV4::ScopedValue value(scope, QV4::Serialize::deserialize(data, v4));
+    QV4::ScopedValue value(scope, QV4::Serialize::deserialize(data, script));
 
     QV4::JSCallData jsCallData(scope, 1);
-    *jsCallData->thisObject = v4->global();
+    *jsCallData->thisObject = script->global();
     jsCallData->args[0] = value;
     onmessage->call(jsCallData);
     if (scope.hasException()) {
@@ -264,35 +254,33 @@ void QQuickWorkerScriptEnginePrivate::processLoad(int id, const QUrl &url)
     if (!script)
         return;
 
-    QV4::ExecutionEngine *v4 = QV8Engine::getV4(script);
-
     script->source = url;
 
     if (fileName.endsWith(QLatin1String(".mjs"))) {
-        auto moduleUnit = v4->loadModule(url);
+        auto moduleUnit = script->loadModule(url);
         if (moduleUnit) {
-            if (moduleUnit->instantiate(v4))
+            if (moduleUnit->instantiate(script))
                 moduleUnit->evaluate();
         } else {
-            v4->throwError(QStringLiteral("Could not load module file"));
+            script->throwError(QStringLiteral("Could not load module file"));
         }
     } else {
         QString error;
-        QV4::Scope scope(v4);
+        QV4::Scope scope(script);
         QScopedPointer<QV4::Script> program;
-        program.reset(QV4::Script::createFromFileOrCache(v4, /*qmlContext*/nullptr, fileName, url, &error));
+        program.reset(QV4::Script::createFromFileOrCache(script, /*qmlContext*/nullptr, fileName, url, &error));
         if (program.isNull()) {
             if (!error.isEmpty())
                 qWarning().nospace() << error;
             return;
         }
 
-        if (!v4->hasException)
+        if (!script->hasException)
             program->run();
     }
 
-    if (v4->hasException) {
-        QQmlError error = v4->catchExceptionAsQmlError();
+    if (script->hasException) {
+        QQmlError error = script->catchExceptionAsQmlError();
         reportScriptException(script, error);
     }
 }
@@ -389,45 +377,22 @@ QQuickWorkerScriptEngine::~QQuickWorkerScriptEngine()
     d->deleteLater();
 }
 
-QQuickWorkerScriptEnginePrivate::WorkerScript::WorkerScript(int id, QQuickWorkerScriptEnginePrivate *parent)
-    : QV8Engine(new QV4::ExecutionEngine)
-    , p(parent)
+WorkerScript::WorkerScript(int id, QQuickWorkerScriptEnginePrivate *parent)
+    : p(parent)
     , id(id)
 {
-    m_v4Engine->v8Engine = this;
-
     initQmlGlobalObject();
 
-    QV4::Scope scope(m_v4Engine);
+    QV4::Scope scope(this);
     QV4::ScopedObject api(scope, scope.engine->newObject());
-    QV4::ScopedString name(scope, m_v4Engine->newString(QStringLiteral("sendMessage")));
-    QV4::ScopedValue sendMessage(scope, QV4::FunctionObject::createBuiltinFunction(m_v4Engine, name, method_sendMessage, 1));
+    QV4::ScopedString name(scope, newString(QStringLiteral("sendMessage")));
+    QV4::ScopedValue sendMessage(scope, QV4::FunctionObject::createBuiltinFunction(this, name, QQuickWorkerScriptEnginePrivate::method_sendMessage, 1));
     api->put(QV4::ScopedString(scope, scope.engine->newString(QStringLiteral("sendMessage"))), sendMessage);
-    m_v4Engine->globalObject->put(QV4::ScopedString(scope, scope.engine->newString(QStringLiteral("WorkerScript"))), api);
-}
-
-QQuickWorkerScriptEnginePrivate::WorkerScript::~WorkerScript()
-{
-    delete m_v4Engine;
-}
-
-#if QT_CONFIG(qml_network)
-QNetworkAccessManager *QQuickWorkerScriptEnginePrivate::WorkerScript::networkAccessManager()
-{
-    if (!accessManager) {
-        if (p->qmlengine && p->qmlengine->networkAccessManagerFactory()) {
-            accessManager.reset(p->qmlengine->networkAccessManagerFactory()->create(p));
-        } else {
-            accessManager.reset(new QNetworkAccessManager(p));
-        }
-    }
-    return accessManager.data();
+    globalObject->put(QV4::ScopedString(scope, scope.engine->newString(QStringLiteral("WorkerScript"))), api);
 }
-#endif
 
 int QQuickWorkerScriptEngine::registerWorkerScript(QQuickWorkerScript *owner)
 {
-    typedef QQuickWorkerScriptEnginePrivate::WorkerScript WorkerScript;
     WorkerScript *script = new WorkerScript(d->m_nextId++, d);
 
     script->owner = owner;
@@ -441,8 +406,7 @@ int QQuickWorkerScriptEngine::registerWorkerScript(QQuickWorkerScript *owner)
 
 void QQuickWorkerScriptEngine::removeWorkerScript(int id)
 {
-    QQuickWorkerScriptEnginePrivate::WorkerScript* script = d->workers.value(id);
-    if (script) {
+    if (WorkerScript *script = d->workers.value(id)) {
         script->owner = nullptr;
         QCoreApplication::postEvent(d, new WorkerRemoveEvent(id));
     }
diff --git a/src/quick/items/context2d/qquickcontext2d.cpp b/src/quick/items/context2d/qquickcontext2d.cpp
index 58bc12a221..5640721c6f 100644
--- a/src/quick/items/context2d/qquickcontext2d.cpp
+++ b/src/quick/items/context2d/qquickcontext2d.cpp
@@ -473,7 +473,7 @@ static QFont qt_font_from_string(const QString& fontString, const QFont &current
     return newFont;
 }
 
-class QQuickContext2DEngineData : public QV8Engine::Deletable
+class QQuickContext2DEngineData : public QV4::ExecutionEngine::Deletable
 {
 public:
     QQuickContext2DEngineData(QV4::ExecutionEngine *engine);
diff --git a/src/quick/scenegraph/qsgdefaultdistancefieldglyphcache.cpp b/src/quick/scenegraph/qsgdefaultdistancefieldglyphcache.cpp
index 8121b4559e..9ad0a77318 100644
--- a/src/quick/scenegraph/qsgdefaultdistancefieldglyphcache.cpp
+++ b/src/quick/scenegraph/qsgdefaultdistancefieldglyphcache.cpp
@@ -41,6 +41,7 @@
 
 #include <QtCore/qelapsedtimer.h>
 #include <QtCore/qbuffer.h>
+#include <QtCore/qendian.h>
 #include <QtQml/qqmlfile.h>
 
 #include <QtGui/private/qdistancefield_p.h>