Merge branch 'master' of git@scm.dev.nokia.troll.no:qt/oslo-staging-1

8 files changed, 1253 insertions, 841 deletions

diff --git a/src/script/api/qscriptengine.cpp b/src/script/api/qscriptengine.cpp
index 237b6fd..739b3fc 100644
--- a/src/script/api/qscriptengine.cpp
+++ b/src/script/api/qscriptengine.cpp
@@ -24,7 +24,6 @@
 #include "config.h"
 #include "qscriptengine.h"
 #include "qscriptsyntaxchecker_p.h"
-#include "qnumeric.h"
 
 #include "qscriptengine_p.h"
 #include "qscriptengineagent_p.h"
@@ -41,12 +40,11 @@
 #include <QtCore/qstringlist.h>
 #include <QtCore/qmetaobject.h>
 
+#include <math.h>
+
 #include "Error.h"
-#include "JSArray.h"
 #include "JSLock.h"
 #include "Interpreter.h"
-#include "DateConstructor.h"
-#include "RegExpConstructor.h"
 
 #include "PrototypeFunction.h"
 #include "InitializeThreading.h"
@@ -56,11 +54,10 @@
 #include "TimeoutChecker.h"
 #include "JSFunction.h"
 #include "Parser.h"
+#include "PropertyNameArray.h"
 #include "Operations.h"
 
-#include "utils/qscriptdate_p.h"
 #include "bridge/qscriptfunction_p.h"
-#include "bridge/qscriptobject_p.h"
 #include "bridge/qscriptclassobject_p.h"
 #include "bridge/qscriptvariant_p.h"
 #include "bridge/qscriptqobject_p.h"
@@ -328,6 +325,74 @@ public:
 namespace QScript
 {
 
+static const qsreal D32 = 4294967296.0;
+
+qint32 ToInt32(qsreal n)
+{
+    if (qIsNaN(n) || qIsInf(n) || (n == 0))
+        return 0;
+
+    qsreal sign = (n < 0) ? -1.0 : 1.0;
+    qsreal abs_n = fabs(n);
+
+    n = ::fmod(sign * ::floor(abs_n), D32);
+    const double D31 = D32 / 2.0;
+
+    if (sign == -1 && n < -D31)
+        n += D32;
+
+    else if (sign != -1 && n >= D31)
+        n -= D32;
+
+    return qint32 (n);
+}
+
+quint32 ToUInt32(qsreal n)
+{
+    if (qIsNaN(n) || qIsInf(n) || (n == 0))
+        return 0;
+
+    qsreal sign = (n < 0) ? -1.0 : 1.0;
+    qsreal abs_n = fabs(n);
+
+    n = ::fmod(sign * ::floor(abs_n), D32);
+
+    if (n < 0)
+        n += D32;
+
+    return quint32 (n);
+}
+
+quint16 ToUInt16(qsreal n)
+{
+    static const qsreal D16 = 65536.0;
+
+    if (qIsNaN(n) || qIsInf(n) || (n == 0))
+        return 0;
+
+    qsreal sign = (n < 0) ? -1.0 : 1.0;
+    qsreal abs_n = fabs(n);
+
+    n = ::fmod(sign * ::floor(abs_n), D16);
+
+    if (n < 0)
+        n += D16;
+
+    return quint16 (n);
+}
+
+qsreal ToInteger(qsreal n)
+{
+    if (qIsNaN(n))
+        return 0;
+
+    if (n == 0 || qIsInf(n))
+        return n;
+
+    int sign = n < 0 ? -1 : 1;
+    return sign * ::floor(::fabs(n));
+}
+
 void GlobalClientData::mark(JSC::MarkStack& markStack)
 {
     engine->mark(markStack);
@@ -482,11 +547,9 @@ JSC::JSValue JSC_HOST_CALL functionDisconnect(JSC::ExecState *exec, JSC::JSObjec
         if (isFunction(arg1))
             slot = arg1;
         else {
-            // ### don't go via QScriptValue
             QScript::SaveFrameHelper saveFrame(engine, exec);
-            QScriptValue tmp = engine->scriptValueFromJSCValue(arg0);
-            QString propertyName(arg1.toString(exec));
-            slot = engine->scriptValueToJSCValue(tmp.property(propertyName, QScriptValue::ResolvePrototype));
+            QString propertyName(QScriptEnginePrivate::toString(exec, arg1));
+            slot = QScriptEnginePrivate::property(exec, arg0, propertyName, QScriptValue::ResolvePrototype);
         }
     }
 
@@ -566,11 +629,9 @@ JSC::JSValue JSC_HOST_CALL functionConnect(JSC::ExecState *exec, JSC::JSObject *
         if (isFunction(arg1))
             slot = arg1;
         else {
-            // ### don't go via QScriptValue
             QScript::SaveFrameHelper saveFrame(engine, exec);
-            QScriptValue tmp = engine->scriptValueFromJSCValue(arg0);
-            QString propertyName = arg1.toString(exec);
-            slot = engine->scriptValueToJSCValue(tmp.property(propertyName, QScriptValue::ResolvePrototype));
+            QString propertyName = QScriptEnginePrivate::toString(exec, arg1);
+            slot = QScriptEnginePrivate::property(exec, arg0, propertyName, QScriptValue::ResolvePrototype);
         }
     }
 
@@ -844,22 +905,15 @@ QScriptEnginePrivate::~QScriptEnginePrivate()
     }
 }
 
-QScriptValue QScriptEnginePrivate::scriptValueFromVariant(const QVariant &v)
-{
-    QScriptValue result = create(v.userType(), v.data());
-    Q_ASSERT(result.isValid());
-    return result;
-}
-
-QVariant QScriptEnginePrivate::scriptValueToVariant(const QScriptValue &value, int targetType)
+QVariant QScriptEnginePrivate::jscValueToVariant(JSC::ExecState *exec, JSC::JSValue value, int targetType)
 {
     QVariant v(targetType, (void *)0);
-    if (QScriptEnginePrivate::convert(value, targetType, v.data(), this))
+    if (convertValue(exec, value, targetType, v.data()))
         return v;
     if (uint(targetType) == QVariant::LastType)
-        return value.toVariant();
-    if (value.isVariant()) {
-        v = value.toVariant();
+        return toVariant(exec, value);
+    if (isVariant(value)) {
+        v = variantValue(value);
         if (v.canConvert(QVariant::Type(targetType))) {
             v.convert(QVariant::Type(targetType));
             return v;
@@ -870,88 +924,61 @@ QVariant QScriptEnginePrivate::scriptValueToVariant(const QScriptValue &value, i
             return QVariant(targetType, *reinterpret_cast<void* *>(v.data()));
         }
     }
-
     return QVariant();
 }
 
-JSC::JSValue QScriptEnginePrivate::jscValueFromVariant(const QVariant &v)
-{
-    // ### it's inefficient to convert to QScriptValue and then to JSValue
-    QScriptValue vv = scriptValueFromVariant(v);
-    QScriptValuePrivate *p = QScriptValuePrivate::get(vv);
-    switch (p->type) {
-    case QScriptValuePrivate::JavaScriptCore:
-        return p->jscValue;
-    case QScriptValuePrivate::Number:
-        return JSC::jsNumber(currentFrame, p->numberValue);
-    case QScriptValuePrivate::String: {
-        JSC::UString str = p->stringValue;
-        return JSC::jsString(currentFrame, str);
-      }
-    }
-    return JSC::JSValue();
-}
-
-QVariant QScriptEnginePrivate::jscValueToVariant(JSC::JSValue value, int targetType)
+JSC::JSValue QScriptEnginePrivate::arrayFromStringList(JSC::ExecState *exec, const QStringList &lst)
 {
-    // ### it's inefficient to convert to QScriptValue and then to QVariant
-    return scriptValueToVariant(scriptValueFromJSCValue(value), targetType);
-}
-
-QScriptValue QScriptEnginePrivate::arrayFromStringList(const QStringList &lst)
-{
-    Q_Q(QScriptEngine);
-    QScriptValue arr = q->newArray(lst.size());
+    JSC::JSValue arr =  newArray(exec, lst.size());
     for (int i = 0; i < lst.size(); ++i)
-        arr.setProperty(i, QScriptValue(q, lst.at(i)));
+        setProperty(exec, arr, i, JSC::jsString(exec, lst.at(i)));
     return arr;
 }
 
-QStringList QScriptEnginePrivate::stringListFromArray(const QScriptValue &arr)
+QStringList QScriptEnginePrivate::stringListFromArray(JSC::ExecState *exec, JSC::JSValue arr)
 {
     QStringList lst;
-    uint len = arr.property(QLatin1String("length")).toUInt32();
+    uint len = toUInt32(exec, property(exec, arr, exec->propertyNames().length));
     for (uint i = 0; i < len; ++i)
-        lst.append(arr.property(i).toString());
+        lst.append(toString(exec, property(exec, arr, i)));
     return lst;
 }
 
-QScriptValue QScriptEnginePrivate::arrayFromVariantList(const QVariantList &lst)
+JSC::JSValue QScriptEnginePrivate::arrayFromVariantList(JSC::ExecState *exec, const QVariantList &lst)
 {
-    Q_Q(QScriptEngine);
-    QScriptValue arr = q->newArray(lst.size());
+    JSC::JSValue arr = newArray(exec, lst.size());
     for (int i = 0; i < lst.size(); ++i)
-        arr.setProperty(i, scriptValueFromVariant(lst.at(i)));
+        setProperty(exec, arr, i, jscValueFromVariant(exec, lst.at(i)));
     return arr;
 }
 
-QVariantList QScriptEnginePrivate::variantListFromArray(const QScriptValue &arr)
+QVariantList QScriptEnginePrivate::variantListFromArray(JSC::ExecState *exec, JSC::JSValue arr)
 {
     QVariantList lst;
-    uint len = arr.property(QLatin1String("length")).toUInt32();
+    uint len = toUInt32(exec, property(exec, arr, exec->propertyNames().length));
     for (uint i = 0; i < len; ++i)
-        lst.append(arr.property(i).toVariant());
+        lst.append(toVariant(exec, property(exec, arr, i)));
     return lst;
 }
 
-QScriptValue QScriptEnginePrivate::objectFromVariantMap(const QVariantMap &vmap)
+JSC::JSValue QScriptEnginePrivate::objectFromVariantMap(JSC::ExecState *exec, const QVariantMap &vmap)
 {
-    Q_Q(QScriptEngine);
-    QScriptValue obj = q->newObject();
+    JSC::JSValue obj = JSC::constructEmptyObject(exec);
     QVariantMap::const_iterator it;
     for (it = vmap.constBegin(); it != vmap.constEnd(); ++it)
-        obj.setProperty(it.key(), scriptValueFromVariant(it.value()));
+        setProperty(exec, obj, it.key(), jscValueFromVariant(exec, it.value()));
     return obj;
 }
 
-QVariantMap QScriptEnginePrivate::variantMapFromObject(const QScriptValue &obj)
+QVariantMap QScriptEnginePrivate::variantMapFromObject(JSC::ExecState *exec, JSC::JSValue obj)
 {
+    JSC::PropertyNameArray propertyNames(exec);
+    propertyNames.setShouldCache(false);
+    JSC::asObject(obj)->getOwnPropertyNames(exec, propertyNames, /*includeNonEnumerable=*/true);
     QVariantMap vmap;
-    QScriptValueIterator it(obj);
-    while (it.hasNext()) {
-        it.next();
-        vmap.insert(it.name(), it.value().toVariant());
-    }
+    JSC::PropertyNameArray::const_iterator it = propertyNames.begin();
+    for( ; it != propertyNames.end(); ++it)
+        vmap.insert(it->ustring(), toVariant(exec, property(exec, obj, *it)));
     return vmap;
 }
 
@@ -1280,13 +1307,13 @@ JSC::JSValue QScriptEnginePrivate::newQMetaObject(
     return result;
 }
 
-bool QScriptEnginePrivate::convertToNativeQObject(const QScriptValue &value,
+bool QScriptEnginePrivate::convertToNativeQObject(JSC::ExecState *exec, JSC::JSValue value,
                                                   const QByteArray &targetType,
                                                   void **result)
 {
     if (!targetType.endsWith('*'))
         return false;
-    if (QObject *qobject = value.toQObject()) {
+    if (QObject *qobject = toQObject(exec, value)) {
         int start = targetType.startsWith("const ") ? 6 : 0;
         QByteArray className = targetType.mid(start, targetType.size()-start-1);
         if (void *instance = qobject->qt_metacast(className)) {
@@ -1427,6 +1454,328 @@ void QScriptEnginePrivate::detachAllRegisteredScriptStrings()
     registeredScriptStrings = 0;
 }
 
+#ifndef QT_NO_REGEXP
+
+extern QString qt_regexp_toCanonical(const QString &, QRegExp::PatternSyntax);
+
+JSC::JSValue QScriptEnginePrivate::newRegExp(JSC::ExecState *exec, const QRegExp &regexp)
+{
+    JSC::JSValue buf[2];
+    JSC::ArgList args(buf, sizeof(buf));
+
+    //convert the pattern to a ECMAScript pattern
+    QString pattern = qt_regexp_toCanonical(regexp.pattern(), regexp.patternSyntax());
+    if (regexp.isMinimal()) {
+        QString ecmaPattern;
+        int len = pattern.length();
+        ecmaPattern.reserve(len);
+        int i = 0;
+        const QChar *wc = pattern.unicode();
+        bool inBracket = false;
+        while (i < len) {
+            QChar c = wc[i++];
+            ecmaPattern += c;
+            switch (c.unicode()) {
+            case '?':
+            case '+':
+            case '*':
+            case '}':
+                if (!inBracket)
+                    ecmaPattern += QLatin1Char('?');
+                break;
+            case '\\':
+                if (i < len)
+                    ecmaPattern += wc[i++];
+                break;
+            case '[':
+                inBracket = true;
+                break;
+            case ']':
+                inBracket = false;
+               break;
+            default:
+                break;
+            }
+        }
+        pattern = ecmaPattern;
+    }
+
+    JSC::UString jscPattern = pattern;
+    QString flags;
+    if (regexp.caseSensitivity() == Qt::CaseInsensitive)
+        flags.append(QLatin1Char('i'));
+    JSC::UString jscFlags = flags;
+    buf[0] = JSC::jsString(exec, jscPattern);
+    buf[1] = JSC::jsString(exec, jscFlags);
+    return JSC::constructRegExp(exec, args);
+}
+
+#endif
+
+JSC::JSValue QScriptEnginePrivate::newRegExp(JSC::ExecState *exec, const QString &pattern, const QString &flags)
+{
+    JSC::JSValue buf[2];
+    JSC::ArgList args(buf, sizeof(buf));
+    JSC::UString jscPattern = pattern;
+    QString strippedFlags;
+    if (flags.contains(QLatin1Char('i')))
+        strippedFlags += QLatin1Char('i');
+    if (flags.contains(QLatin1Char('m')))
+        strippedFlags += QLatin1Char('m');
+    if (flags.contains(QLatin1Char('g')))
+        strippedFlags += QLatin1Char('g');
+    JSC::UString jscFlags = strippedFlags;
+    buf[0] = JSC::jsString(exec, jscPattern);
+    buf[1] = JSC::jsString(exec, jscFlags);
+    return JSC::constructRegExp(exec, args);
+}
+
+JSC::JSValue QScriptEnginePrivate::newVariant(const QVariant &value)
+{
+    QScriptObject *obj = new (currentFrame) QScriptObject(variantWrapperObjectStructure);
+    obj->setDelegate(new QScript::QVariantDelegate(value));
+    JSC::JSValue proto = defaultPrototype(value.userType());
+    if (proto)
+        obj->setPrototype(proto);
+    return obj;
+}
+
+JSC::JSValue QScriptEnginePrivate::newVariant(JSC::JSValue objectValue,
+                                              const QVariant &value)
+{
+    if (!isObject(objectValue))
+        return newVariant(value);
+    JSC::JSObject *jscObject = JSC::asObject(objectValue);
+    if (!jscObject->inherits(&QScriptObject::info)) {
+        qWarning("QScriptEngine::newVariant(): changing class of non-QScriptObject not supported");
+        return JSC::JSValue();
+    }
+    QScriptObject *jscScriptObject = static_cast<QScriptObject*>(jscObject);
+    if (!isVariant(objectValue)) {
+        jscScriptObject->setDelegate(new QScript::QVariantDelegate(value));
+    } else {
+        setVariantValue(objectValue, value);
+    }
+    return objectValue;
+}
+
+#ifndef QT_NO_REGEXP
+
+QRegExp QScriptEnginePrivate::toRegExp(JSC::ExecState *exec, JSC::JSValue value)
+{
+    if (!isRegExp(value))
+        return QRegExp();
+    QString pattern = toString(exec, property(exec, value, QLatin1String("source"), QScriptValue::ResolvePrototype));
+    Qt::CaseSensitivity kase = Qt::CaseSensitive;
+    if (toBool(exec, property(exec, value, QLatin1String("ignoreCase"), QScriptValue::ResolvePrototype)))
+        kase = Qt::CaseInsensitive;
+    return QRegExp(pattern, kase, QRegExp::RegExp2);
+}
+
+#endif
+
+QVariant QScriptEnginePrivate::toVariant(JSC::ExecState *exec, JSC::JSValue value)
+{
+    if (isObject(value)) {
+        if (isVariant(value))
+            return variantValue(value);
+#ifndef QT_NO_QOBJECT
+        else if (isQObject(value))
+            return qVariantFromValue(toQObject(exec, value));
+#endif
+        else if (isDate(value))
+            return QVariant(toDateTime(exec, value));
+#ifndef QT_NO_REGEXP
+        else if (isRegExp(value))
+            return QVariant(toRegExp(exec, value));
+#endif
+        else if (isArray(value))
+            return variantListFromArray(exec, value);
+        else if (QScriptDeclarativeClass *dc = declarativeClass(value))
+            return dc->toVariant(declarativeObject(value));
+        // try to convert to primitive
+        JSC::JSValue savedException;
+        saveException(exec, &savedException);
+        JSC::JSValue prim = value.toPrimitive(exec);
+        restoreException(exec, savedException);
+        if (!prim.isObject())
+            return toVariant(exec, prim);
+    } else if (value.isNumber()) {
+        return QVariant(toNumber(exec, value));
+    } else if (value.isString()) {
+        return QVariant(toString(exec, value));
+    } else if (value.isBoolean()) {
+        return QVariant(toBool(exec, value));
+    }
+    return QVariant();
+}
+
+JSC::JSValue QScriptEnginePrivate::propertyHelper(JSC::ExecState *exec, JSC::JSValue value, const JSC::Identifier &id, int resolveMode)
+{
+    JSC::JSValue result;
+    if (!(resolveMode & QScriptValue::ResolvePrototype)) {
+        // Look in the object's own properties
+        JSC::JSObject *object = JSC::asObject(value);
+        JSC::PropertySlot slot(object);
+        if (object->getOwnPropertySlot(exec, id, slot))
+            result = slot.getValue(exec, id);
+    }
+    if (!result && (resolveMode & QScriptValue::ResolveScope)) {
+        // ### check if it's a function object and look in the scope chain
+        JSC::JSValue scope = property(exec, value, QString::fromLatin1("__qt_scope__"), QScriptValue::ResolveLocal);
+        if (isObject(scope))
+            result = property(exec, scope, id, resolveMode);
+    }
+    return result;
+}
+
+JSC::JSValue QScriptEnginePrivate::propertyHelper(JSC::ExecState *exec, JSC::JSValue value, quint32 index, int resolveMode)
+{
+    JSC::JSValue result;
+    if (!(resolveMode & QScriptValue::ResolvePrototype)) {
+        // Look in the object's own properties
+        JSC::JSObject *object = JSC::asObject(value);
+        JSC::PropertySlot slot(object);
+        if (object->getOwnPropertySlot(exec, index, slot))
+            result = slot.getValue(exec, index);
+    }
+    return result;
+}
+
+void QScriptEnginePrivate::setProperty(JSC::ExecState *exec, JSC::JSValue objectValue, const JSC::Identifier &id,
+                                       JSC::JSValue value, const QScriptValue::PropertyFlags &flags)
+{
+    JSC::JSObject *thisObject = JSC::asObject(objectValue);
+    JSC::JSValue setter = thisObject->lookupSetter(exec, id);
+    JSC::JSValue getter = thisObject->lookupGetter(exec, id);
+    if ((flags & QScriptValue::PropertyGetter) || (flags & QScriptValue::PropertySetter)) {
+        if (!value) {
+            // deleting getter/setter
+            if ((flags & QScriptValue::PropertyGetter) && (flags & QScriptValue::PropertySetter)) {
+                // deleting both: just delete the property
+                thisObject->deleteProperty(exec, id, /*checkDontDelete=*/false);
+            } else if (flags & QScriptValue::PropertyGetter) {
+                // preserve setter, if there is one
+                thisObject->deleteProperty(exec, id, /*checkDontDelete=*/false);
+                if (setter && setter.isObject())
+                    thisObject->defineSetter(exec, id, JSC::asObject(setter));
+            } else { // flags & QScriptValue::PropertySetter
+                // preserve getter, if there is one
+                thisObject->deleteProperty(exec, id, /*checkDontDelete=*/false);
+                if (getter && getter.isObject())
+                    thisObject->defineGetter(exec, id, JSC::asObject(getter));
+            }
+        } else {
+            if (value.isObject()) { // ### should check if it has callData()
+                // defining getter/setter
+                if (id == exec->propertyNames().underscoreProto) {
+                    qWarning("QScriptValue::setProperty() failed: "
+                             "cannot set getter or setter of native property `__proto__'");
+                } else {
+                    if (flags & QScriptValue::PropertyGetter)
+                        thisObject->defineGetter(exec, id, JSC::asObject(value));
+                    if (flags & QScriptValue::PropertySetter)
+                        thisObject->defineSetter(exec, id, JSC::asObject(value));
+                }
+            } else {
+                qWarning("QScriptValue::setProperty(): getter/setter must be a function");
+            }
+        }
+    } else {
+        // setting the value
+        if (getter && getter.isObject() && !(setter && setter.isObject())) {
+            qWarning("QScriptValue::setProperty() failed: "
+                     "property '%s' has a getter but no setter",
+                     qPrintable(QString(id.ustring())));
+            return;
+        }
+        if (!value) {
+            // ### check if it's a getter/setter property
+            thisObject->deleteProperty(exec, id, /*checkDontDelete=*/false);
+        } else if (flags != QScriptValue::KeepExistingFlags) {
+            if (thisObject->hasOwnProperty(exec, id))
+                thisObject->deleteProperty(exec, id, /*checkDontDelete=*/false); // ### hmmm - can't we just update the attributes?
+            unsigned attribs = 0;
+            if (flags & QScriptValue::ReadOnly)
+                attribs |= JSC::ReadOnly;
+            if (flags & QScriptValue::SkipInEnumeration)
+                attribs |= JSC::DontEnum;
+            if (flags & QScriptValue::Undeletable)
+                attribs |= JSC::DontDelete;
+            attribs |= flags & QScriptValue::UserRange;
+            thisObject->putWithAttributes(exec, id, value, attribs);
+        } else {
+            JSC::PutPropertySlot slot;
+            thisObject->put(exec, id, value, slot);
+        }
+    }
+}
+
+void QScriptEnginePrivate::setProperty(JSC::ExecState *exec, JSC::JSValue objectValue, quint32 index,
+                                       JSC::JSValue value, const QScriptValue::PropertyFlags &flags)
+{
+    if (!value) {
+        JSC::asObject(objectValue)->deleteProperty(exec, index, /*checkDontDelete=*/false);
+    } else {
+        if ((flags & QScriptValue::PropertyGetter) || (flags & QScriptValue::PropertySetter)) {
+            // fall back to string-based setProperty(), since there is no
+            // JSC::JSObject::defineGetter(unsigned)
+            setProperty(exec, objectValue, JSC::Identifier::from(exec, index), value, flags);
+        } else {
+            if (flags != QScriptValue::KeepExistingFlags) {
+                //                if (JSC::asObject(d->jscValue)->hasOwnProperty(exec, arrayIndex))
+                //                    JSC::asObject(d->jscValue)->deleteProperty(exec, arrayIndex);
+                unsigned attribs = 0;
+                if (flags & QScriptValue::ReadOnly)
+                    attribs |= JSC::ReadOnly;
+                if (flags & QScriptValue::SkipInEnumeration)
+                    attribs |= JSC::DontEnum;
+                if (flags & QScriptValue::Undeletable)
+                    attribs |= JSC::DontDelete;
+                attribs |= flags & QScriptValue::UserRange;
+                JSC::asObject(objectValue)->putWithAttributes(exec, index, value, attribs);
+            } else {
+                JSC::asObject(objectValue)->put(exec, index, value);
+            }
+        }
+    }
+}
+
+QScriptValue::PropertyFlags QScriptEnginePrivate::propertyFlags(JSC::ExecState *exec, JSC::JSValue value, const JSC::Identifier &id,
+                                                                const QScriptValue::ResolveFlags &mode)
+{
+    JSC::JSObject *object = JSC::asObject(value);
+    unsigned attribs = 0;
+    JSC::PropertyDescriptor descriptor;
+    if (object->getOwnPropertyDescriptor(exec, id, descriptor))
+        attribs = descriptor.attributes();
+    else if (!object->getPropertyAttributes(exec, id, attribs)) {
+        if ((mode & QScriptValue::ResolvePrototype) && object->prototype() && object->prototype().isObject()) {
+            JSC::JSValue proto = object->prototype();
+            return propertyFlags(exec, proto, id, mode);
+        }
+        return 0;
+    }
+    QScriptValue::PropertyFlags result = 0;
+    if (attribs & JSC::ReadOnly)
+        result |= QScriptValue::ReadOnly;
+    if (attribs & JSC::DontEnum)
+        result |= QScriptValue::SkipInEnumeration;
+    if (attribs & JSC::DontDelete)
+        result |= QScriptValue::Undeletable;
+    //We cannot rely on attribs JSC::Setter/Getter because they are not necesserly set by JSC (bug?)
+    if (attribs & JSC::Getter || !object->lookupGetter(exec, id).isUndefinedOrNull())
+        result |= QScriptValue::PropertyGetter;
+    if (attribs & JSC::Setter || !object->lookupSetter(exec, id).isUndefinedOrNull())
+        result |= QScriptValue::PropertySetter;
+#ifndef QT_NO_QOBJECT
+    if (attribs & QScript::QObjectMemberAttribute)
+        result |= QScriptValue::QObjectMember;
+#endif
+    result |= QScriptValue::PropertyFlag(attribs & QScriptValue::UserRange);
+    return result;
+}
+
 #ifdef QT_NO_QOBJECT
 
 QScriptEngine::QScriptEngine()
@@ -1599,56 +1948,7 @@ extern QString qt_regexp_toCanonical(const QString &, QRegExp::PatternSyntax);
 QScriptValue QScriptEngine::newRegExp(const QRegExp &regexp)
 {
     Q_D(QScriptEngine);
-    JSC::ExecState* exec = d->currentFrame;
-    JSC::JSValue buf[2];
-    JSC::ArgList args(buf, sizeof(buf));
-
-    //convert the pattern to a ECMAScript pattern
-    QString pattern = qt_regexp_toCanonical(regexp.pattern(), regexp.patternSyntax());
-    if (regexp.isMinimal()) {
-        QString ecmaPattern;
-        int len = pattern.length();
-        ecmaPattern.reserve(len);
-        int i = 0;
-        const QChar *wc = pattern.unicode();
-        bool inBracket = false;
-        while (i < len) {
-            QChar c = wc[i++];
-            ecmaPattern += c;
-            switch (c.unicode()) {
-            case '?':
-            case '+':
-            case '*':
-            case '}':
-                if (!inBracket)
-                    ecmaPattern += QLatin1Char('?');
-                break;
-            case '\\':
-                if (i < len)
-                    ecmaPattern += wc[i++];
-                break;
-            case '[':
-                inBracket = true;
-                break;
-            case ']':
-                inBracket = false;
-                break;
-            default:
-                break;
-            }
-        }
-        pattern = ecmaPattern;
-    }
-
-    JSC::UString jscPattern = pattern;
-    QString flags;
-    if (regexp.caseSensitivity() == Qt::CaseInsensitive)
-        flags.append(QLatin1Char('i'));
-    JSC::UString jscFlags = flags;
-    buf[0] = JSC::jsString(exec, jscPattern);
-    buf[1] = JSC::jsString(exec, jscFlags);
-    JSC::JSObject* result = JSC::constructRegExp(exec, args);
-    return d->scriptValueFromJSCValue(result);
+    return d->scriptValueFromJSCValue(d->newRegExp(d->currentFrame, regexp));
 }
 
 #endif // QT_NO_REGEXP
@@ -1666,14 +1966,7 @@ QScriptValue QScriptEngine::newRegExp(const QRegExp &regexp)
 QScriptValue QScriptEngine::newVariant(const QVariant &value)
 {
     Q_D(QScriptEngine);
-    JSC::ExecState* exec = d->currentFrame;
-    QScriptObject *obj = new (exec) QScriptObject(d->variantWrapperObjectStructure);
-    obj->setDelegate(new QScript::QVariantDelegate(value));
-    QScriptValue result = d->scriptValueFromJSCValue(obj);
-    QScriptValue proto = defaultPrototype(value.userType());
-    if (proto.isValid())
-        result.setPrototype(proto);
-    return result;
+    return d->scriptValueFromJSCValue(d->newVariant(value));
 }
 
 /*!
@@ -1703,20 +1996,9 @@ QScriptValue QScriptEngine::newVariant(const QVariant &value)
 QScriptValue QScriptEngine::newVariant(const QScriptValue &object,
                                        const QVariant &value)
 {
-    if (!object.isObject())
-        return newVariant(value);
-    JSC::JSObject *jscObject = JSC::asObject(QScriptValuePrivate::get(object)->jscValue);
-    if (!jscObject->inherits(&QScriptObject::info)) {
-        qWarning("QScriptEngine::newVariant(): changing class of non-QScriptObject not supported");
-        return QScriptValue();
-    }
-    QScriptObject *jscScriptObject = static_cast<QScriptObject*>(jscObject);
-    if (!object.isVariant()) {
-        jscScriptObject->setDelegate(new QScript::QVariantDelegate(value));
-    } else {
-        QScriptValuePrivate::get(object)->setVariantValue(value);
-    }
-    return object;
+    Q_D(QScriptEngine);
+    JSC::JSValue jsObject = d->scriptValueToJSCValue(object);
+    return d->scriptValueFromJSCValue(d->newVariant(jsObject, value));
 }
 
 #ifndef QT_NO_QOBJECT
@@ -1812,9 +2094,7 @@ QScriptValue QScriptEngine::newQObject(const QScriptValue &scriptObject,
 QScriptValue QScriptEngine::newObject()
 {
     Q_D(QScriptEngine);
-    JSC::ExecState* exec = d->currentFrame;
-    JSC::JSObject *result = new (exec)QScriptObject(d->scriptObjectStructure);
-    return d->scriptValueFromJSCValue(result);
+    return d->scriptValueFromJSCValue(d->newObject());
 }
 
 /*!
@@ -1937,9 +2217,7 @@ QScriptValue QScriptEngine::newFunction(QScriptEngine::FunctionWithArgSignature
 QScriptValue QScriptEngine::newArray(uint length)
 {
     Q_D(QScriptEngine);
-    JSC::ExecState* exec = d->currentFrame;
-    JSC::JSArray* result = JSC::constructEmptyArray(exec, length);
-    return d->scriptValueFromJSCValue(result);
+    return d->scriptValueFromJSCValue(d->newArray(d->currentFrame, length));
 }
 
 /*!
@@ -1952,22 +2230,7 @@ QScriptValue QScriptEngine::newArray(uint length)
 QScriptValue QScriptEngine::newRegExp(const QString &pattern, const QString &flags)
 {
     Q_D(QScriptEngine);
-    JSC::ExecState* exec = d->currentFrame;
-    JSC::JSValue buf[2];
-    JSC::ArgList args(buf, sizeof(buf));
-    JSC::UString jscPattern = pattern;
-    QString strippedFlags;
-    if (flags.contains(QLatin1Char('i')))
-        strippedFlags += QLatin1Char('i');
-    if (flags.contains(QLatin1Char('m')))
-        strippedFlags += QLatin1Char('m');
-    if (flags.contains(QLatin1Char('g')))
-        strippedFlags += QLatin1Char('g');
-    JSC::UString jscFlags = strippedFlags;
-    buf[0] = JSC::jsString(exec, jscPattern);
-    buf[1] = JSC::jsString(exec, jscFlags);
-    JSC::JSObject* result = JSC::constructRegExp(exec, args);
-    return d->scriptValueFromJSCValue(result);
+    return d->scriptValueFromJSCValue(d->newRegExp(d->currentFrame, pattern, flags));
 }
 
 /*!
@@ -1978,11 +2241,7 @@ QScriptValue QScriptEngine::newRegExp(const QString &pattern, const QString &fla
 QScriptValue QScriptEngine::newDate(qsreal value)
 {
     Q_D(QScriptEngine);
-    JSC::ExecState* exec = d->currentFrame;
-    JSC::JSValue val = JSC::jsNumber(exec, value);
-    JSC::ArgList args(&val, 1);
-    JSC::JSObject *result = JSC::constructDate(exec, args);
-    return d->scriptValueFromJSCValue(result);
+    return d->scriptValueFromJSCValue(d->newDate(d->currentFrame, value));
 }
 
 /*!
@@ -1992,7 +2251,8 @@ QScriptValue QScriptEngine::newDate(qsreal value)
 */
 QScriptValue QScriptEngine::newDate(const QDateTime &value)
 {
-    return newDate(QScript::FromDateTime(value));
+    Q_D(QScriptEngine);
+    return d->scriptValueFromJSCValue(d->newDate(d->currentFrame, value));
 }
 
 #ifndef QT_NO_QOBJECT
@@ -2551,128 +2811,126 @@ void QScriptEngine::setDefaultPrototype(int metaTypeId, const QScriptValue &prot
 QScriptValue QScriptEngine::create(int type, const void *ptr)
 {
     Q_D(QScriptEngine);
-    return d->create(type, ptr);
+    return d->scriptValueFromJSCValue(d->create(d->currentFrame, type, ptr));
 }
 
-QScriptValue QScriptEnginePrivate::create(int type, const void *ptr)
+JSC::JSValue QScriptEnginePrivate::create(JSC::ExecState *exec, int type, const void *ptr)
 {
-    Q_Q(QScriptEngine);
     Q_ASSERT(ptr != 0);
-    QScriptValue result;
-    QScriptTypeInfo *info = m_typeInfos.value(type);
+    JSC::JSValue result;
+    QScriptEnginePrivate *eng = exec ? QScript::scriptEngineFromExec(exec) : 0;
+    QScriptTypeInfo *info = eng ? eng->m_typeInfos.value(type) : 0;
     if (info && info->marshal) {
-        result = info->marshal(q, ptr);
+        result = eng->scriptValueToJSCValue(info->marshal(eng->q_func(), ptr));
     } else {
         // check if it's one of the types we know
         switch (QMetaType::Type(type)) {
         case QMetaType::Void:
-            return QScriptValue(q, QScriptValue::UndefinedValue);
+            return JSC::jsUndefined();
         case QMetaType::Bool:
-            return QScriptValue(q, *reinterpret_cast<const bool*>(ptr));
+            return JSC::jsBoolean(*reinterpret_cast<const bool*>(ptr));
         case QMetaType::Int:
-            return QScriptValue(q, *reinterpret_cast<const int*>(ptr));
+            return JSC::jsNumber(exec, *reinterpret_cast<const int*>(ptr));
         case QMetaType::UInt:
-            return QScriptValue(q, *reinterpret_cast<const uint*>(ptr));
+            return JSC::jsNumber(exec, *reinterpret_cast<const uint*>(ptr));
         case QMetaType::LongLong:
-            return QScriptValue(q, qsreal(*reinterpret_cast<const qlonglong*>(ptr)));
+            return JSC::jsNumber(exec, qsreal(*reinterpret_cast<const qlonglong*>(ptr)));
         case QMetaType::ULongLong:
 #if defined(Q_OS_WIN) && defined(_MSC_FULL_VER) && _MSC_FULL_VER <= 12008804
 #pragma message("** NOTE: You need the Visual Studio Processor Pack to compile support for 64bit unsigned integers.")
-            return QScriptValue(q, qsreal((qlonglong)*reinterpret_cast<const qulonglong*>(ptr)));
+            return JSC::jsNumber(exec, qsreal((qlonglong)*reinterpret_cast<const qulonglong*>(ptr)));
 #elif defined(Q_CC_MSVC) && !defined(Q_CC_MSVC_NET)
-            return QScriptValue(q, qsreal((qlonglong)*reinterpret_cast<const qulonglong*>(ptr)));
+            return JSC::jsNumber(exec, qsreal((qlonglong)*reinterpret_cast<const qulonglong*>(ptr)));
 #else
-            return QScriptValue(q, qsreal(*reinterpret_cast<const qulonglong*>(ptr)));
+            return JSC::jsNumber(exec, qsreal(*reinterpret_cast<const qulonglong*>(ptr)));
 #endif
         case QMetaType::Double:
-            return QScriptValue(q, qsreal(*reinterpret_cast<const double*>(ptr)));
+            return JSC::jsNumber(exec, qsreal(*reinterpret_cast<const double*>(ptr)));
         case QMetaType::QString:
-            return QScriptValue(q, *reinterpret_cast<const QString*>(ptr));
+            return JSC::jsString(exec, *reinterpret_cast<const QString*>(ptr));
         case QMetaType::Float:
-            return QScriptValue(q, *reinterpret_cast<const float*>(ptr));
+            return JSC::jsNumber(exec, *reinterpret_cast<const float*>(ptr));
         case QMetaType::Short:
-            return QScriptValue(q, *reinterpret_cast<const short*>(ptr));
+            return JSC::jsNumber(exec, *reinterpret_cast<const short*>(ptr));
         case QMetaType::UShort:
-            return QScriptValue(q, *reinterpret_cast<const unsigned short*>(ptr));
+            return JSC::jsNumber(exec, *reinterpret_cast<const unsigned short*>(ptr));
         case QMetaType::Char:
-            return QScriptValue(q, *reinterpret_cast<const char*>(ptr));
+            return JSC::jsNumber(exec, *reinterpret_cast<const char*>(ptr));
         case QMetaType::UChar:
-            return QScriptValue(q, *reinterpret_cast<const unsigned char*>(ptr));
+            return JSC::jsNumber(exec, *reinterpret_cast<const unsigned char*>(ptr));
         case QMetaType::QChar:
-            return QScriptValue(q, (*reinterpret_cast<const QChar*>(ptr)).unicode());
+            return JSC::jsNumber(exec, (*reinterpret_cast<const QChar*>(ptr)).unicode());
         case QMetaType::QStringList:
-            result = arrayFromStringList(*reinterpret_cast<const QStringList *>(ptr));
+            result = arrayFromStringList(exec, *reinterpret_cast<const QStringList *>(ptr));
             break;
         case QMetaType::QVariantList:
-            result = arrayFromVariantList(*reinterpret_cast<const QVariantList *>(ptr));
+            result = arrayFromVariantList(exec, *reinterpret_cast<const QVariantList *>(ptr));
             break;
         case QMetaType::QVariantMap:
-            result = objectFromVariantMap(*reinterpret_cast<const QVariantMap *>(ptr));
+            result = objectFromVariantMap(exec, *reinterpret_cast<const QVariantMap *>(ptr));
             break;
         case QMetaType::QDateTime:
-            result = q->newDate(*reinterpret_cast<const QDateTime *>(ptr));
+            result = newDate(exec, *reinterpret_cast<const QDateTime *>(ptr));
             break;
         case QMetaType::QDate:
-            result = q->newDate(QDateTime(*reinterpret_cast<const QDate *>(ptr)));
+            result = newDate(exec, QDateTime(*reinterpret_cast<const QDate *>(ptr)));
             break;
 #ifndef QT_NO_REGEXP
         case QMetaType::QRegExp:
-            result = q->newRegExp(*reinterpret_cast<const QRegExp *>(ptr));
+            result = newRegExp(exec, *reinterpret_cast<const QRegExp *>(ptr));
             break;
 #endif
 #ifndef QT_NO_QOBJECT
         case QMetaType::QObjectStar:
         case QMetaType::QWidgetStar:
-            result = q->newQObject(*reinterpret_cast<QObject* const *>(ptr));
+            result = eng->newQObject(*reinterpret_cast<QObject* const *>(ptr));
             break;
 #endif
         default:
             if (type == qMetaTypeId<QScriptValue>()) {
-                result = *reinterpret_cast<const QScriptValue*>(ptr);
-                if (!result.isValid())
-                    return QScriptValue(q, QScriptValue::UndefinedValue);
+                result = eng->scriptValueToJSCValue(*reinterpret_cast<const QScriptValue*>(ptr));
+                if (!result)
+                    return JSC::jsUndefined();
             }
 
 #ifndef QT_NO_QOBJECT
             // lazy registration of some common list types
             else if (type == qMetaTypeId<QObjectList>()) {
-                qScriptRegisterSequenceMetaType<QObjectList>(q);
-                return create(type, ptr);
+                qScriptRegisterSequenceMetaType<QObjectList>(eng->q_func());
+                return create(exec, type, ptr);
             }
 #endif
             else if (type == qMetaTypeId<QList<int> >()) {
-                qScriptRegisterSequenceMetaType<QList<int> >(q);
-                return create(type, ptr);
+                qScriptRegisterSequenceMetaType<QList<int> >(eng->q_func());
+                return create(exec, type, ptr);
             }
 
             else {
                 QByteArray typeName = QMetaType::typeName(type);
                 if (typeName == "QVariant")
-                    result = scriptValueFromVariant(*reinterpret_cast<const QVariant*>(ptr));
+                    result = jscValueFromVariant(exec, *reinterpret_cast<const QVariant*>(ptr));
                 if (typeName.endsWith('*') && !*reinterpret_cast<void* const *>(ptr))
-                    return QScriptValue(q, QScriptValue::NullValue);
+                    return JSC::jsNull();
                 else
-                    result = q->newVariant(QVariant(type, ptr));
+                    result = eng->newVariant(QVariant(type, ptr));
             }
         }
     }
-    if (result.isObject() && info && info->prototype
-        && JSC::JSValue::strictEqual(scriptValueToJSCValue(result.prototype()), originalGlobalObject()->objectPrototype())) {
-        result.setPrototype(scriptValueFromJSCValue(info->prototype));
+    if (result && result.isObject() && info && info->prototype
+        && JSC::JSValue::strictEqual(JSC::asObject(result)->prototype(), eng->originalGlobalObject()->objectPrototype())) {
+        JSC::asObject(result)->setPrototype(info->prototype);
     }
     return result;
 }
 
-bool QScriptEnginePrivate::convert(const QScriptValue &value,
-                                   int type, void *ptr,
-                                   QScriptEnginePrivate *eng)
+bool QScriptEnginePrivate::convertValue(JSC::ExecState *exec, JSC::JSValue value,
+                                        int type, void *ptr)
 {
-    if (!eng)
-        eng = QScriptValuePrivate::getEngine(value);
+    QScriptEnginePrivate *eng = exec ? QScript::scriptEngineFromExec(exec) : 0;
     if (eng) {
         QScriptTypeInfo *info = eng->m_typeInfos.value(type);
         if (info && info->demarshal) {
-            info->demarshal(value, ptr);
+            info->demarshal(eng->scriptValueFromJSCValue(value), ptr);
             return true;
         }
     }
@@ -2680,78 +2938,78 @@ bool QScriptEnginePrivate::convert(const QScriptValue &value,
     // check if it's one of the types we know
     switch (QMetaType::Type(type)) {
     case QMetaType::Bool:
-        *reinterpret_cast<bool*>(ptr) = value.toBoolean();
+        *reinterpret_cast<bool*>(ptr) = toBool(exec, value);
         return true;
     case QMetaType::Int:
-        *reinterpret_cast<int*>(ptr) = value.toInt32();
+        *reinterpret_cast<int*>(ptr) = toInt32(exec, value);
         return true;
     case QMetaType::UInt:
-        *reinterpret_cast<uint*>(ptr) = value.toUInt32();
+        *reinterpret_cast<uint*>(ptr) = toUInt32(exec, value);
         return true;
     case QMetaType::LongLong:
-        *reinterpret_cast<qlonglong*>(ptr) = qlonglong(value.toInteger());
+        *reinterpret_cast<qlonglong*>(ptr) = qlonglong(toInteger(exec, value));
         return true;
     case QMetaType::ULongLong:
-        *reinterpret_cast<qulonglong*>(ptr) = qulonglong(value.toInteger());
+        *reinterpret_cast<qulonglong*>(ptr) = qulonglong(toInteger(exec, value));
         return true;
     case QMetaType::Double:
-        *reinterpret_cast<double*>(ptr) = value.toNumber();
+        *reinterpret_cast<double*>(ptr) = toNumber(exec, value);
         return true;
     case QMetaType::QString:
         if (value.isUndefined() || value.isNull())
             *reinterpret_cast<QString*>(ptr) = QString();
         else
-            *reinterpret_cast<QString*>(ptr) = value.toString();
+            *reinterpret_cast<QString*>(ptr) = toString(exec, value);
         return true;
     case QMetaType::Float:
-        *reinterpret_cast<float*>(ptr) = value.toNumber();
+        *reinterpret_cast<float*>(ptr) = toNumber(exec, value);
         return true;
     case QMetaType::Short:
-        *reinterpret_cast<short*>(ptr) = short(value.toInt32());
+        *reinterpret_cast<short*>(ptr) = short(toInt32(exec, value));
         return true;
     case QMetaType::UShort:
-        *reinterpret_cast<unsigned short*>(ptr) = value.toUInt16();
+        *reinterpret_cast<unsigned short*>(ptr) = QScript::ToUInt16(toNumber(exec, value));
         return true;
     case QMetaType::Char:
-        *reinterpret_cast<char*>(ptr) = char(value.toInt32());
+        *reinterpret_cast<char*>(ptr) = char(toInt32(exec, value));
         return true;
     case QMetaType::UChar:
-        *reinterpret_cast<unsigned char*>(ptr) = (unsigned char)(value.toInt32());
+        *reinterpret_cast<unsigned char*>(ptr) = (unsigned char)(toInt32(exec, value));
         return true;
     case QMetaType::QChar:
         if (value.isString()) {
-            QString str = value.toString();
+            QString str = toString(exec, value);
             *reinterpret_cast<QChar*>(ptr) = str.isEmpty() ? QChar() : str.at(0);
         } else {
-            *reinterpret_cast<QChar*>(ptr) = QChar(value.toUInt16());
+            *reinterpret_cast<QChar*>(ptr) = QChar(QScript::ToUInt16(toNumber(exec, value)));
         }
         return true;
     case QMetaType::QDateTime:
-        if (value.isDate()) {
-            *reinterpret_cast<QDateTime *>(ptr) = value.toDateTime();
+        if (isDate(value)) {
+            *reinterpret_cast<QDateTime *>(ptr) = toDateTime(exec, value);
             return true;
         } break;
     case QMetaType::QDate:
-        if (value.isDate()) {
-            *reinterpret_cast<QDate *>(ptr) = value.toDateTime().date();
+        if (isDate(value)) {
+            *reinterpret_cast<QDate *>(ptr) = toDateTime(exec, value).date();
             return true;
         } break;
 #ifndef QT_NO_REGEXP
     case QMetaType::QRegExp:
-        if (value.isRegExp()) {
-            *reinterpret_cast<QRegExp *>(ptr) = value.toRegExp();
+        if (isRegExp(value)) {
+            *reinterpret_cast<QRegExp *>(ptr) = toRegExp(exec, value);
             return true;
         } break;
 #endif
 #ifndef QT_NO_QOBJECT
     case QMetaType::QObjectStar:
-        if (value.isQObject() || value.isNull()) {
-            *reinterpret_cast<QObject* *>(ptr) = value.toQObject();
+        if (isQObject(value) || value.isNull()) {
+            *reinterpret_cast<QObject* *>(ptr) = toQObject(exec, value);
             return true;
         } break;
     case QMetaType::QWidgetStar:
-        if (value.isQObject() || value.isNull()) {
-            QObject *qo = value.toQObject();
+        if (isQObject(value) || value.isNull()) {
+            QObject *qo = toQObject(exec, value);
             if (!qo || qo->isWidgetType()) {
                 *reinterpret_cast<QWidget* *>(ptr) = reinterpret_cast<QWidget*>(qo);
                 return true;
@@ -2759,18 +3017,18 @@ bool QScriptEnginePrivate::convert(const QScriptValue &value,
         } break;
 #endif
     case QMetaType::QStringList:
-        if (value.isArray()) {
-            *reinterpret_cast<QStringList *>(ptr) = stringListFromArray(value);
+        if (isArray(value)) {
+            *reinterpret_cast<QStringList *>(ptr) = stringListFromArray(exec, value);
             return true;
         } break;
     case QMetaType::QVariantList:
-        if (value.isArray()) {
-            *reinterpret_cast<QVariantList *>(ptr) = variantListFromArray(value);
+        if (isArray(value)) {
+            *reinterpret_cast<QVariantList *>(ptr) = variantListFromArray(exec, value);
             return true;
         } break;
     case QMetaType::QVariantMap:
-        if (value.isObject()) {
-            *reinterpret_cast<QVariantMap *>(ptr) = variantMapFromObject(value);
+        if (isObject(value)) {
+            *reinterpret_cast<QVariantMap *>(ptr) = variantMapFromObject(exec, value);
             return true;
         } break;
     default:
@@ -2779,28 +3037,28 @@ bool QScriptEnginePrivate::convert(const QScriptValue &value,
 
     QByteArray name = QMetaType::typeName(type);
 #ifndef QT_NO_QOBJECT
-    if (convertToNativeQObject(value, name, reinterpret_cast<void* *>(ptr)))
+    if (convertToNativeQObject(exec, value, name, reinterpret_cast<void* *>(ptr)))
         return true;
 #endif
-    if (value.isVariant() && name.endsWith('*')) {
+    if (isVariant(value) && name.endsWith('*')) {
         int valueType = QMetaType::type(name.left(name.size()-1));
-        QVariant &var = QScriptValuePrivate::get(value)->variantValue();
+        QVariant &var = variantValue(value);
         if (valueType == var.userType()) {
             *reinterpret_cast<void* *>(ptr) = var.data();
             return true;
         } else {
             // look in the prototype chain
-            QScriptValue proto = value.prototype();
+            JSC::JSValue proto = JSC::asObject(value)->prototype();
             while (proto.isObject()) {
                 bool canCast = false;
-                if (proto.isVariant()) {
-                    canCast = (type == proto.toVariant().userType())
-                              || (valueType && (valueType == proto.toVariant().userType()));
+                if (isVariant(proto)) {
+                    canCast = (type == variantValue(proto).userType())
+                              || (valueType && (valueType == variantValue(proto).userType()));
                 }
 #ifndef QT_NO_QOBJECT
-                else if (proto.isQObject()) {
+                else if (isQObject(proto)) {
                     QByteArray className = name.left(name.size()-1);
-                    if (QObject *qobject = proto.toQObject())
+                    if (QObject *qobject = toQObject(exec, proto))
                         canCast = qobject->qt_metacast(className) != 0;
                 }
 #endif
@@ -2812,7 +3070,7 @@ bool QScriptEnginePrivate::convert(const QScriptValue &value,
                         *reinterpret_cast<void* *>(ptr) = var.data();
                     return true;
                 }
-                proto = proto.prototype();
+                proto = JSC::asObject(proto)->prototype();
             }
         }
     } else if (value.isNull() && name.endsWith('*')) {
@@ -2821,10 +3079,10 @@ bool QScriptEnginePrivate::convert(const QScriptValue &value,
     } else if (type == qMetaTypeId<QScriptValue>()) {
         if (!eng)
             return false;
-        *reinterpret_cast<QScriptValue*>(ptr) = value;
+        *reinterpret_cast<QScriptValue*>(ptr) = eng->scriptValueFromJSCValue(value);
         return true;
     } else if (name == "QVariant") {
-        *reinterpret_cast<QVariant*>(ptr) = value.toVariant();
+        *reinterpret_cast<QVariant*>(ptr) = toVariant(exec, value);
         return true;
     }
 
@@ -2834,14 +3092,14 @@ bool QScriptEnginePrivate::convert(const QScriptValue &value,
         if (!eng)
             return false;
         qScriptRegisterSequenceMetaType<QObjectList>(eng->q_func());
-        return convert(value, type, ptr, eng);
+        return convertValue(exec, value, type, ptr);
     }
 #endif
     else if (type == qMetaTypeId<QList<int> >()) {
         if (!eng)
             return false;
         qScriptRegisterSequenceMetaType<QList<int> >(eng->q_func());
-        return convert(value, type, ptr, eng);
+        return convertValue(exec, value, type, ptr);
     }
 
 #if 0
@@ -2853,6 +3111,102 @@ bool QScriptEnginePrivate::convert(const QScriptValue &value,
     return false;
 }
 
+bool QScriptEnginePrivate::convertNumber(qsreal value, int type, void *ptr)
+{
+    switch (QMetaType::Type(type)) {
+    case QMetaType::Bool:
+        *reinterpret_cast<bool*>(ptr) = QScript::ToBool(value);
+        return true;
+    case QMetaType::Int:
+        *reinterpret_cast<int*>(ptr) = QScript::ToInt32(value);
+        return true;
+    case QMetaType::UInt:
+        *reinterpret_cast<uint*>(ptr) = QScript::ToUInt32(value);
+        return true;
+    case QMetaType::LongLong:
+        *reinterpret_cast<qlonglong*>(ptr) = qlonglong(QScript::ToInteger(value));
+        return true;
+    case QMetaType::ULongLong:
+        *reinterpret_cast<qulonglong*>(ptr) = qulonglong(QScript::ToInteger(value));
+        return true;
+    case QMetaType::Double:
+        *reinterpret_cast<double*>(ptr) = value;
+        return true;
+    case QMetaType::QString:
+        *reinterpret_cast<QString*>(ptr) = QScript::ToString(value);
+        return true;
+    case QMetaType::Float:
+        *reinterpret_cast<float*>(ptr) = value;
+        return true;
+    case QMetaType::Short:
+        *reinterpret_cast<short*>(ptr) = short(QScript::ToInt32(value));
+        return true;
+    case QMetaType::UShort:
+        *reinterpret_cast<unsigned short*>(ptr) = QScript::ToUInt16(value);
+        return true;
+    case QMetaType::Char:
+        *reinterpret_cast<char*>(ptr) = char(QScript::ToInt32(value));
+        return true;
+    case QMetaType::UChar:
+        *reinterpret_cast<unsigned char*>(ptr) = (unsigned char)(QScript::ToInt32(value));
+        return true;
+    case QMetaType::QChar:
+        *reinterpret_cast<QChar*>(ptr) = QChar(QScript::ToUInt16(value));
+        return true;
+    default:
+        break;
+    }
+    return false;
+}
+
+bool QScriptEnginePrivate::convertString(const QString &value, int type, void *ptr)
+{
+    switch (QMetaType::Type(type)) {
+    case QMetaType::Bool:
+        *reinterpret_cast<bool*>(ptr) = QScript::ToBool(value);
+        return true;
+    case QMetaType::Int:
+        *reinterpret_cast<int*>(ptr) = QScript::ToInt32(value);
+        return true;
+    case QMetaType::UInt:
+        *reinterpret_cast<uint*>(ptr) = QScript::ToUInt32(value);
+        return true;
+    case QMetaType::LongLong:
+        *reinterpret_cast<qlonglong*>(ptr) = qlonglong(QScript::ToInteger(value));
+        return true;
+    case QMetaType::ULongLong:
+        *reinterpret_cast<qulonglong*>(ptr) = qulonglong(QScript::ToInteger(value));
+        return true;
+    case QMetaType::Double:
+        *reinterpret_cast<double*>(ptr) = QScript::ToNumber(value);
+        return true;
+    case QMetaType::QString:
+        *reinterpret_cast<QString*>(ptr) = value;
+        return true;
+    case QMetaType::Float:
+        *reinterpret_cast<float*>(ptr) = QScript::ToNumber(value);
+        return true;
+    case QMetaType::Short:
+        *reinterpret_cast<short*>(ptr) = short(QScript::ToInt32(value));
+        return true;
+    case QMetaType::UShort:
+        *reinterpret_cast<unsigned short*>(ptr) = QScript::ToUInt16(value);
+        return true;
+    case QMetaType::Char:
+        *reinterpret_cast<char*>(ptr) = char(QScript::ToInt32(value));
+        return true;
+    case QMetaType::UChar:
+        *reinterpret_cast<unsigned char*>(ptr) = (unsigned char)(QScript::ToInt32(value));
+        return true;
+    case QMetaType::QChar:
+        *reinterpret_cast<QChar*>(ptr) = QChar(QScript::ToUInt16(value));
+        return true;
+    default:
+        break;
+    }
+    return false;
+}
+
 bool QScriptEnginePrivate::hasDemarshalFunction(int type) const
 {
     QScriptTypeInfo *info = m_typeInfos.value(type);
@@ -2865,7 +3219,7 @@ bool QScriptEnginePrivate::hasDemarshalFunction(int type) const
 bool QScriptEngine::convert(const QScriptValue &value, int type, void *ptr)
 {
     Q_D(QScriptEngine);
-    return QScriptEnginePrivate::convert(value, type, ptr, d);
+    return QScriptEnginePrivate::convertValue(d->currentFrame, d->scriptValueToJSCValue(value), type, ptr);
 }
 
 /*!
@@ -2873,7 +3227,20 @@ bool QScriptEngine::convert(const QScriptValue &value, int type, void *ptr)
 */
 bool QScriptEngine::convertV2(const QScriptValue &value, int type, void *ptr)
 {
-    return QScriptEnginePrivate::convert(value, type, ptr, /*engine=*/0);
+    QScriptValuePrivate *vp = QScriptValuePrivate::get(value);
+    if (vp) {
+        switch (vp->type) {
+        case QScriptValuePrivate::JavaScriptCore: {
+            JSC::ExecState *exec = vp->engine ? vp->engine->currentFrame : 0;
+            return QScriptEnginePrivate::convertValue(exec, vp->jscValue, type, ptr);
+        }
+        case QScriptValuePrivate::Number:
+            return QScriptEnginePrivate::convertNumber(vp->numberValue, type, ptr);
+        case QScriptValuePrivate::String:
+            return QScriptEnginePrivate::convertString(vp->stringValue, type, ptr);
+        }
+    }
+    return false;
 }
 
 /*!
diff --git a/src/script/api/qscriptengine_p.h b/src/script/api/qscriptengine_p.h
index 6780b2c..eff34af 100644
--- a/src/script/api/qscriptengine_p.h
+++ b/src/script/api/qscriptengine_p.h
@@ -37,14 +37,30 @@
 
 #include "private/qobject_p.h"
 
+#include <QtCore/qdatetime.h>
 #include <QtCore/qhash.h>
+#include <QtCore/qnumeric.h>
+#include <QtCore/qregexp.h>
 #include <QtCore/qset.h>
 #include "qscriptvalue_p.h"
 #include "qscriptstring_p.h"
-
+#include "bridge/qscriptclassobject_p.h"
+#include "bridge/qscriptdeclarativeclass_p.h"
+#include "bridge/qscriptdeclarativeobject_p.h"
+#include "bridge/qscriptobject_p.h"
+#include "bridge/qscriptqobject_p.h"
+#include "bridge/qscriptvariant_p.h"
+#include "utils/qscriptdate_p.h"
+
+#include "DateConstructor.h"
+#include "DateInstance.h"
 #include "Debugger.h"
+#include "ErrorInstance.h"
+#include "JSArray.h"
 #include "Lexer.h"
 #include "RefPtr.h"
+#include "RegExpConstructor.h"
+#include "RegExpObject.h"
 #include "SourceProvider.h"
 #include "Structure.h"
 #include "JSGlobalObject.h"
@@ -83,6 +99,20 @@ namespace QScript
 #endif
     class TimeoutCheckerProxy;
 
+    qint32 ToInt32(qsreal);
+    quint32 ToUInt32(qsreal);
+    quint16 ToUInt16(qsreal);
+    qsreal ToInteger(qsreal);
+
+    inline bool ToBool(qsreal);
+    inline bool ToBool(const QString &);
+    inline qsreal ToNumber(const QString &);
+    inline qint32 ToInt32(const QString &);
+    inline quint32 ToUInt32(const QString &);
+    inline quint16 ToUInt16(const QString &);
+    inline qsreal ToInteger(const QString &);
+    inline QString ToString(qsreal);
+
     //some conversion helper functions
     inline QScriptEnginePrivate *scriptEngineFromExec(const JSC::ExecState *exec);
     bool isFunction(JSC::JSValue value);
@@ -114,29 +144,72 @@ public:
     static QScriptEnginePrivate *get(QScriptEngine *q) { return q ? q->d_func() : 0; }
     static QScriptEngine *get(QScriptEnginePrivate *d) { return d ? d->q_func() : 0; }
 
-    static bool convert(const QScriptValue &value,
-                        int type, void *ptr,
-                        QScriptEnginePrivate *eng);
-    QScriptValue create(int type, const void *ptr);
+    static inline bool isArray(JSC::JSValue);
+    static inline bool isDate(JSC::JSValue);
+    static inline bool isError(JSC::JSValue);
+    static inline bool isObject(JSC::JSValue);
+    static inline bool isRegExp(JSC::JSValue);
+    static inline bool isVariant(JSC::JSValue);
+    static inline bool isQObject(JSC::JSValue);
+    static inline bool isQMetaObject(JSC::JSValue);
+
+    static inline bool toBool(JSC::ExecState *, JSC::JSValue);
+    static inline qsreal toInteger(JSC::ExecState *, JSC::JSValue);
+    static inline qsreal toNumber(JSC::ExecState *, JSC::JSValue);
+    static inline qint32 toInt32(JSC::ExecState *, JSC::JSValue);
+    static inline quint32 toUInt32(JSC::ExecState *, JSC::JSValue);
+    static inline quint16 toUInt16(JSC::ExecState *, JSC::JSValue);
+    static inline QString toString(JSC::ExecState *, JSC::JSValue);
+
+    static inline QDateTime toDateTime(JSC::ExecState *, JSC::JSValue);
+#ifndef QT_NO_REGEXP
+    static QRegExp toRegExp(JSC::ExecState*, JSC::JSValue);
+#endif
+    static QVariant toVariant(JSC::ExecState *, JSC::JSValue);
+    static inline QObject *toQObject(JSC::ExecState *, JSC::JSValue);
+    static inline const QMetaObject *toQMetaObject(JSC::ExecState *, JSC::JSValue);
+
+    static inline JSC::JSValue property(JSC::ExecState*, JSC::JSValue, const JSC::Identifier &id,
+                                 int resolveMode = QScriptValue::ResolvePrototype);
+    static JSC::JSValue propertyHelper(JSC::ExecState*, JSC::JSValue, const JSC::Identifier &id, int resolveMode);
+    static inline JSC::JSValue property(JSC::ExecState*, JSC::JSValue, quint32 index,
+                                 int resolveMode = QScriptValue::ResolvePrototype);
+    static JSC::JSValue propertyHelper(JSC::ExecState*, JSC::JSValue, quint32, int resolveMode);
+    static inline JSC::JSValue property(JSC::ExecState*, JSC::JSValue, const QString &, int resolveMode);
+    static inline void setProperty(JSC::ExecState*, JSC::JSValue object, const QString &name, JSC::JSValue,
+                     const QScriptValue::PropertyFlags &flags = QScriptValue::KeepExistingFlags);
+    static void setProperty(JSC::ExecState*, JSC::JSValue object, const JSC::Identifier &id, JSC::JSValue,
+                     const QScriptValue::PropertyFlags &flags = QScriptValue::KeepExistingFlags);
+    static void setProperty(JSC::ExecState*, JSC::JSValue object, quint32 index, JSC::JSValue,
+                     const QScriptValue::PropertyFlags &flags = QScriptValue::KeepExistingFlags);
+    static QScriptValue::PropertyFlags propertyFlags(JSC::ExecState*, JSC::JSValue value,
+                                              const JSC::Identifier &id, const QScriptValue::ResolveFlags &mode);
+    static inline QScriptValue::PropertyFlags propertyFlags(JSC::ExecState*, JSC::JSValue value,
+                                              const QString &name, const QScriptValue::ResolveFlags &mode);
+
+    static bool convertValue(JSC::ExecState*, JSC::JSValue value,
+                             int type, void *ptr);
+    static bool convertNumber(qsreal, int type, void *ptr);
+    static bool convertString(const QString &, int type, void *ptr);
+    static JSC::JSValue create(JSC::ExecState*, int type, const void *ptr);
     bool hasDemarshalFunction(int type) const;
 
     inline QScriptValue scriptValueFromJSCValue(JSC::JSValue value);
     inline JSC::JSValue scriptValueToJSCValue(const QScriptValue &value);
 
-    QScriptValue scriptValueFromVariant(const QVariant &value);
-    QVariant scriptValueToVariant(const QScriptValue &value, int targetType);
-
-    JSC::JSValue jscValueFromVariant(const QVariant &value);
-    QVariant jscValueToVariant(JSC::JSValue value, int targetType);
+    static inline JSC::JSValue jscValueFromVariant(JSC::ExecState*, const QVariant &value);
+    static QVariant jscValueToVariant(JSC::ExecState*, JSC::JSValue value, int targetType);
+    static inline QVariant &variantValue(JSC::JSValue value);
+    static inline void setVariantValue(JSC::JSValue objectValue, const QVariant &value);
 
-    QScriptValue arrayFromStringList(const QStringList &lst);
-    static QStringList stringListFromArray(const QScriptValue &arr);
+    static JSC::JSValue arrayFromStringList(JSC::ExecState*, const QStringList &lst);
+    static QStringList stringListFromArray(JSC::ExecState*, JSC::JSValue arr);
 
-    QScriptValue arrayFromVariantList(const QVariantList &lst);
-    static QVariantList variantListFromArray(const QScriptValue &arr);
+    static JSC::JSValue arrayFromVariantList(JSC::ExecState*, const QVariantList &lst);
+    static QVariantList variantListFromArray(JSC::ExecState*, JSC::JSValue arr);
 
-    QScriptValue objectFromVariantMap(const QVariantMap &vmap);
-    static QVariantMap variantMapFromObject(const QScriptValue &obj);
+    static JSC::JSValue objectFromVariantMap(JSC::ExecState*, const QVariantMap &vmap);
+    static QVariantMap variantMapFromObject(JSC::ExecState*, JSC::JSValue obj);
 
     JSC::JSValue defaultPrototype(int metaTypeId) const;
     void setDefaultPrototype(int metaTypeId, JSC::JSValue prototype);
@@ -177,10 +250,43 @@ public:
 
     void agentDeleted(QScriptEngineAgent *agent);
 
+    static inline void saveException(JSC::ExecState *, JSC::JSValue *);
+    static inline void restoreException(JSC::ExecState *, JSC::JSValue);
+
     void setCurrentException(QScriptValue exception) { m_currentException = exception; }
     QScriptValue currentException() const { return m_currentException; }
     void clearCurrentException() { m_currentException.d_ptr.reset(); }
 
+    static QScriptSyntaxCheckResult checkSyntax(const QString &program);
+    static bool canEvaluate(const QString &program);
+
+    inline QScriptValuePrivate *allocateScriptValuePrivate(size_t);
+    inline void freeScriptValuePrivate(QScriptValuePrivate *p);
+
+    inline void registerScriptValue(QScriptValuePrivate *value);
+    inline void unregisterScriptValue(QScriptValuePrivate *value);
+    void detachAllRegisteredScriptValues();
+
+    inline void registerScriptString(QScriptStringPrivate *value);
+    inline void unregisterScriptString(QScriptStringPrivate *value);
+    void detachAllRegisteredScriptStrings();
+
+    static inline JSC::JSValue newArray(JSC::ExecState *, uint length);
+    static inline JSC::JSValue newDate(JSC::ExecState *, qsreal value);
+    static inline JSC::JSValue newDate(JSC::ExecState *, const QDateTime &);
+    inline JSC::JSValue newObject();
+
+#ifndef QT_NO_REGEXP
+    static JSC::JSValue newRegExp(JSC::ExecState *, const QRegExp &);
+#endif
+
+    static JSC::JSValue newRegExp(JSC::ExecState *, const QString &pattern, const QString &flags);
+    JSC::JSValue newVariant(const QVariant &);
+    JSC::JSValue newVariant(JSC::JSValue objectValue, const QVariant &);
+
+    static inline QScriptDeclarativeClass *declarativeClass(JSC::JSValue);
+    static inline QScriptDeclarativeClass::Object *declarativeObject(JSC::JSValue);
+
 #ifndef QT_NO_QOBJECT
     JSC::JSValue newQObject(QObject *object,
         QScriptEngine::ValueOwnership ownership = QScriptEngine::QtOwnership,
@@ -188,9 +294,7 @@ public:
     JSC::JSValue newQMetaObject(const QMetaObject *metaObject,
                                 JSC::JSValue ctor);
 
-    static QScriptSyntaxCheckResult checkSyntax(const QString &program);
-    static bool canEvaluate(const QString &program);
-    static bool convertToNativeQObject(const QScriptValue &value,
+    static bool convertToNativeQObject(JSC::ExecState*, JSC::JSValue,
                                        const QByteArray &targetType,
                                        void **result);
 
@@ -220,17 +324,6 @@ public:
     bool scriptDisconnect(JSC::JSValue signal, JSC::JSValue receiver,
                           JSC::JSValue function);
 
-    inline QScriptValuePrivate *allocateScriptValuePrivate(size_t);
-    inline void freeScriptValuePrivate(QScriptValuePrivate *p);
-
-    inline void registerScriptValue(QScriptValuePrivate *value);
-    inline void unregisterScriptValue(QScriptValuePrivate *value);
-    void detachAllRegisteredScriptValues();
-
-    inline void registerScriptString(QScriptStringPrivate *value);
-    inline void unregisterScriptString(QScriptStringPrivate *value);
-    void detachAllRegisteredScriptStrings();
-
     // private slots
     void _q_objectDestroyed(QObject *);
 #endif
@@ -370,6 +463,46 @@ inline QScriptEnginePrivate *scriptEngineFromExec(const JSC::ExecState *exec)
     return static_cast<GlobalClientData*>(exec->globalData().clientData)->engine;
 }
 
+inline QString ToString(qsreal value)
+{
+    return JSC::UString::from(value);
+}
+
+inline qsreal ToNumber(const QString &value)
+{
+    return ((JSC::UString)value).toDouble();
+}
+
+inline qint32 ToInt32(const QString &value)
+{
+    return ToInt32(ToNumber(value));
+}
+
+inline quint32 ToUInt32(const QString &value)
+{
+    return ToUInt32(ToNumber(value));
+}
+
+inline quint16 ToUInt16(const QString &value)
+{
+    return ToUInt16(ToNumber(value));
+}
+
+inline qsreal ToInteger(const QString &value)
+{
+    return ToInteger(ToNumber(value));
+}
+
+inline bool ToBool(qsreal value)
+{
+    return (value != 0) && !qIsNaN(value);
+}
+
+inline bool ToBool(const QString &value)
+{
+     return !value.isEmpty();
+}
+
 } // namespace QScript
 
 inline QScriptValuePrivate *QScriptEnginePrivate::allocateScriptValuePrivate(size_t size)
@@ -409,6 +542,13 @@ inline void QScriptEnginePrivate::unregisterScriptValue(QScriptValuePrivate *val
     value->next = 0;
 }
 
+inline JSC::JSValue QScriptEnginePrivate::jscValueFromVariant(JSC::ExecState *exec, const QVariant &v)
+{
+    JSC::JSValue result = create(exec, v.userType(), v.data());
+    Q_ASSERT(result);
+    return result;
+}
+
 inline QScriptValue QScriptEnginePrivate::scriptValueFromJSCValue(JSC::JSValue value)
 {
     if (!value)
@@ -470,32 +610,83 @@ inline void QScriptValuePrivate::initFrom(const QString &value)
         engine->registerScriptValue(this);
 }
 
-inline QScriptValue QScriptValuePrivate::property(const QString &name, int resolveMode) const
+inline JSC::JSValue QScriptEnginePrivate::property(JSC::ExecState *exec, JSC::JSValue value, const QString &name, int resolveMode)
 {
-    JSC::ExecState *exec = engine->currentFrame;
-    return property(JSC::Identifier(exec, name), resolveMode);
+    return property(exec, value, JSC::Identifier(exec, name), resolveMode);
 }
 
-inline QScriptValue QScriptValuePrivate::property(const JSC::Identifier &id, int resolveMode) const
+inline JSC::JSValue QScriptEnginePrivate::property(JSC::ExecState *exec, JSC::JSValue value, const JSC::Identifier &id, int resolveMode)
 {
-    Q_ASSERT(isObject());
-    JSC::ExecState *exec = engine->currentFrame;
-    JSC::JSObject *object = JSC::asObject(jscValue);
+    Q_ASSERT(isObject(value));
+    JSC::JSObject *object = JSC::asObject(value);
     JSC::PropertySlot slot(object);
     if ((resolveMode & QScriptValue::ResolvePrototype) && object->getPropertySlot(exec, id, slot))
-        return engine->scriptValueFromJSCValue(slot.getValue(exec, id));
-    return propertyHelper(id, resolveMode);
+        return slot.getValue(exec, id);
+    return propertyHelper(exec, value, id, resolveMode);
 }
 
-inline QScriptValue QScriptValuePrivate::property(quint32 index, int resolveMode) const
+inline JSC::JSValue QScriptEnginePrivate::property(JSC::ExecState *exec, JSC::JSValue value, quint32 index, int resolveMode)
 {
-    Q_ASSERT(isObject());
-    JSC::ExecState *exec = engine->currentFrame;
-    JSC::JSObject *object = JSC::asObject(jscValue);
+    Q_ASSERT(isObject(value));
+    JSC::JSObject *object = JSC::asObject(value);
     JSC::PropertySlot slot(object);
     if ((resolveMode & QScriptValue::ResolvePrototype) && object->getPropertySlot(exec, index, slot))
-        return engine->scriptValueFromJSCValue(slot.getValue(exec, index));
-    return propertyHelper(index, resolveMode);
+        return slot.getValue(exec, index);
+    return propertyHelper(exec, value, index, resolveMode);
+}
+
+inline QScriptValue::PropertyFlags QScriptEnginePrivate::propertyFlags(JSC::ExecState *exec, JSC::JSValue value,
+                                                                       const QString &name,
+                                                                       const QScriptValue::ResolveFlags &mode)
+{
+    return propertyFlags(exec, value, JSC::Identifier(exec, name), mode);
+}
+
+inline void QScriptEnginePrivate::setProperty(JSC::ExecState *exec, JSC::JSValue objectValue, const QString &name,
+                                              JSC::JSValue value, const QScriptValue::PropertyFlags &flags)
+{
+    setProperty(exec, objectValue, JSC::Identifier(exec, name), value, flags);
+}
+
+inline JSC::JSValue QScriptValuePrivate::property(const JSC::Identifier &id, int resolveMode) const
+{
+    return QScriptEnginePrivate::property(engine->currentFrame, jscValue, id, resolveMode);
+}
+
+inline JSC::JSValue QScriptValuePrivate::property(quint32 index, int resolveMode) const
+{
+    return QScriptEnginePrivate::property(engine->currentFrame, jscValue, index, resolveMode);
+}
+
+inline JSC::JSValue QScriptValuePrivate::property(const QString &name, int resolveMode) const
+{
+    JSC::ExecState *exec = engine->currentFrame;
+    return QScriptEnginePrivate::property(exec, jscValue, JSC::Identifier(exec, name), resolveMode);
+}
+
+inline QScriptValue::PropertyFlags QScriptValuePrivate::propertyFlags(
+        const JSC::Identifier &id, const QScriptValue::ResolveFlags &mode) const
+{
+    return QScriptEnginePrivate::propertyFlags(engine->currentFrame, jscValue, id, mode);
+}
+
+inline void QScriptValuePrivate::setProperty(const JSC::Identifier &id, const JSC::JSValue &value,
+                                             const QScriptValue::PropertyFlags &flags)
+{
+    QScriptEnginePrivate::setProperty(engine->currentFrame, jscValue, id, value, flags);
+}
+
+inline void QScriptValuePrivate::setProperty(quint32 index, const JSC::JSValue &value,
+                                             const QScriptValue::PropertyFlags &flags)
+{
+    QScriptEnginePrivate::setProperty(engine->currentFrame, jscValue, index, value, flags);
+}
+
+inline void QScriptValuePrivate::setProperty(const QString &name, const JSC::JSValue &value,
+                                             const QScriptValue::PropertyFlags &flags)
+{
+    JSC::ExecState *exec = engine->currentFrame;
+    QScriptEnginePrivate::setProperty(exec, jscValue, JSC::Identifier(exec, name), value, flags);
 }
 
 inline void* QScriptValuePrivate::operator new(size_t size, QScriptEnginePrivate *engine)
@@ -514,7 +705,7 @@ inline void QScriptValuePrivate::operator delete(void *ptr)
         qFree(d);
 }
 
-inline void QScriptValuePrivate::saveException(JSC::ExecState *exec, JSC::JSValue *val)
+inline void QScriptEnginePrivate::saveException(JSC::ExecState *exec, JSC::JSValue *val)
 {
     if (exec) {
         *val = exec->exception();
@@ -524,7 +715,7 @@ inline void QScriptValuePrivate::saveException(JSC::ExecState *exec, JSC::JSValu
     }
 }
 
-inline void QScriptValuePrivate::restoreException(JSC::ExecState *exec, JSC::JSValue val)
+inline void QScriptEnginePrivate::restoreException(JSC::ExecState *exec, JSC::JSValue val)
 {
     if (exec && val)
         exec->setException(val);
@@ -578,6 +769,231 @@ inline JSC::ExecState *QScriptEnginePrivate::globalExec() const
     return originalGlobalObject()->globalExec();
 }
 
+inline JSC::JSValue QScriptEnginePrivate::newArray(JSC::ExecState *exec, uint length)
+{
+    return JSC::constructEmptyArray(exec, length);
+}
+
+inline JSC::JSValue QScriptEnginePrivate::newDate(JSC::ExecState *exec, qsreal value)
+{
+    JSC::JSValue val = JSC::jsNumber(exec, value);
+    JSC::ArgList args(&val, 1);
+    return JSC::constructDate(exec, args);
+}
+
+inline JSC::JSValue QScriptEnginePrivate::newDate(JSC::ExecState *exec, const QDateTime &value)
+{
+    return newDate(exec, QScript::FromDateTime(value));
+}
+
+inline JSC::JSValue QScriptEnginePrivate::newObject()
+{
+    return new (currentFrame)QScriptObject(scriptObjectStructure);
+}
+
+inline bool QScriptEnginePrivate::isObject(JSC::JSValue value)
+{
+    return value && value.isObject();
+}
+
+inline bool QScriptEnginePrivate::isArray(JSC::JSValue value)
+{
+    return isObject(value) && value.inherits(&JSC::JSArray::info);
+}
+
+inline bool QScriptEnginePrivate::isDate(JSC::JSValue value)
+{
+    return isObject(value) && value.inherits(&JSC::DateInstance::info);
+}
+
+inline bool QScriptEnginePrivate::isError(JSC::JSValue value)
+{
+    return isObject(value) && value.inherits(&JSC::ErrorInstance::info);
+}
+
+inline bool QScriptEnginePrivate::isRegExp(JSC::JSValue value)
+{
+    return isObject(value) && value.inherits(&JSC::RegExpObject::info);
+}
+
+inline bool QScriptEnginePrivate::isVariant(JSC::JSValue value)
+{
+    if (!isObject(value) || !value.inherits(&QScriptObject::info))
+        return false;
+    QScriptObject *object = static_cast<QScriptObject*>(JSC::asObject(value));
+    QScriptObjectDelegate *delegate = object->delegate();
+    return (delegate && (delegate->type() == QScriptObjectDelegate::Variant));
+}
+
+inline bool QScriptEnginePrivate::isQObject(JSC::JSValue value)
+{
+#ifndef QT_NO_QOBJECT
+    if (!isObject(value) || !value.inherits(&QScriptObject::info))
+        return false;
+    QScriptObject *object = static_cast<QScriptObject*>(JSC::asObject(value));
+    QScriptObjectDelegate *delegate = object->delegate();
+    return (delegate && (delegate->type() == QScriptObjectDelegate::QtObject ||
+                         (delegate->type() == QScriptObjectDelegate::DeclarativeClassObject &&
+                          static_cast<QScript::DeclarativeObjectDelegate*>(delegate)->scriptClass()->isQObject())));
+#else
+    return false;
+#endif
+}
+
+inline bool QScriptEnginePrivate::isQMetaObject(JSC::JSValue value)
+{
+#ifndef QT_NO_QOBJECT
+    return JSC::asObject(value)->inherits(&QScript::QMetaObjectWrapperObject::info);
+#else
+    return false;
+#endif
+}
+
+inline bool QScriptEnginePrivate::toBool(JSC::ExecState *exec, JSC::JSValue value)
+{
+    JSC::JSValue savedException;
+    saveException(exec, &savedException);
+    bool result = value.toBoolean(exec);
+    restoreException(exec, savedException);
+    return result;
+}
+
+inline qsreal QScriptEnginePrivate::toInteger(JSC::ExecState *exec, JSC::JSValue value)
+{
+    JSC::JSValue savedException;
+    saveException(exec, &savedException);
+    qsreal result = value.toInteger(exec);
+    restoreException(exec, savedException);
+    return result;
+}
+
+inline qsreal QScriptEnginePrivate::toNumber(JSC::ExecState *exec, JSC::JSValue value)
+{
+    JSC::JSValue savedException;
+    saveException(exec, &savedException);
+    qsreal result = value.toNumber(exec);
+    restoreException(exec, savedException);
+    return result;
+}
+
+inline qint32 QScriptEnginePrivate::toInt32(JSC::ExecState *exec, JSC::JSValue value)
+{
+    JSC::JSValue savedException;
+    saveException(exec, &savedException);
+    qint32 result = value.toInt32(exec);
+    restoreException(exec, savedException);
+    return result;
+}
+
+inline quint32 QScriptEnginePrivate::toUInt32(JSC::ExecState *exec, JSC::JSValue value)
+{
+    JSC::JSValue savedException;
+    saveException(exec, &savedException);
+    quint32 result = value.toUInt32(exec);
+    restoreException(exec, savedException);
+    return result;
+}
+
+inline quint16 QScriptEnginePrivate::toUInt16(JSC::ExecState *exec, JSC::JSValue value)
+{
+    // ### no equivalent function in JSC
+    return QScript::ToUInt16(toNumber(exec, value));
+}
+
+inline QString QScriptEnginePrivate::toString(JSC::ExecState *exec, JSC::JSValue value)
+{
+    JSC::JSValue savedException;
+    saveException(exec, &savedException);
+    JSC::UString str = value.toString(exec);
+    if (exec && exec->hadException() && !str.size()) {
+        JSC::JSValue savedException2;
+        saveException(exec, &savedException2);
+        str = savedException2.toString(exec);
+        restoreException(exec, savedException2);
+    }
+    if (savedException)
+        restoreException(exec, savedException);
+    return str;
+}
+
+inline QDateTime QScriptEnginePrivate::toDateTime(JSC::ExecState *, JSC::JSValue value)
+{
+    if (!isDate(value))
+        return QDateTime();
+    qsreal t = static_cast<JSC::DateInstance*>(JSC::asObject(value))->internalNumber();
+    return QScript::ToDateTime(t, Qt::LocalTime);
+}
+
+inline QObject *QScriptEnginePrivate::toQObject(JSC::ExecState *exec, JSC::JSValue value)
+{
+#ifndef QT_NO_QOBJECT
+    if (isObject(value) && value.inherits(&QScriptObject::info)) {
+        QScriptObject *object = static_cast<QScriptObject*>(JSC::asObject(value));
+        QScriptObjectDelegate *delegate = object->delegate();
+        if (!delegate)
+            return 0;
+        if (delegate->type() == QScriptObjectDelegate::QtObject)
+            return static_cast<QScript::QObjectDelegate*>(delegate)->value();
+        if (delegate->type() == QScriptObjectDelegate::DeclarativeClassObject)
+            return static_cast<QScript::DeclarativeObjectDelegate*>(delegate)->scriptClass()->toQObject(declarativeObject(value));
+        if (delegate->type() == QScriptObjectDelegate::Variant) {
+            QVariant var = variantValue(value);
+            int type = var.userType();
+            if ((type == QMetaType::QObjectStar) || (type == QMetaType::QWidgetStar))
+                return *reinterpret_cast<QObject* const *>(var.constData());
+        }
+    }
+#endif
+    return 0;
+}
+
+inline const QMetaObject *QScriptEnginePrivate::toQMetaObject(JSC::ExecState*, JSC::JSValue value)
+{
+#ifndef QT_NO_QOBJECT
+    if (isQMetaObject(value))
+        return static_cast<QScript::QMetaObjectWrapperObject*>(JSC::asObject(value))->value();
+#endif
+    return 0;
+}
+
+inline QVariant &QScriptEnginePrivate::variantValue(JSC::JSValue value)
+{
+    Q_ASSERT(value.inherits(&QScriptObject::info));
+    QScriptObjectDelegate *delegate = static_cast<QScriptObject*>(JSC::asObject(value))->delegate();
+    Q_ASSERT(delegate && (delegate->type() == QScriptObjectDelegate::Variant));
+    return static_cast<QScript::QVariantDelegate*>(delegate)->value();
+}
+
+inline void QScriptEnginePrivate::setVariantValue(JSC::JSValue objectValue, const QVariant &value)
+{
+    Q_ASSERT(objectValue.inherits(&QScriptObject::info));
+    QScriptObjectDelegate *delegate = static_cast<QScriptObject*>(JSC::asObject(objectValue))->delegate();
+    Q_ASSERT(delegate && (delegate->type() == QScriptObjectDelegate::Variant));
+    static_cast<QScript::QVariantDelegate*>(delegate)->setValue(value);
+}
+
+inline QScriptDeclarativeClass *QScriptEnginePrivate::declarativeClass(JSC::JSValue v)
+{
+    if (!QScriptEnginePrivate::isObject(v) || !v.inherits(&QScriptObject::info))
+        return 0;
+    QScriptObject *scriptObject = static_cast<QScriptObject*>(JSC::asObject(v));
+    QScriptObjectDelegate *delegate = scriptObject->delegate();
+    if (!delegate || (delegate->type() != QScriptObjectDelegate::DeclarativeClassObject))
+        return 0;
+    return static_cast<QScript::DeclarativeObjectDelegate*>(delegate)->scriptClass();
+}
+
+inline QScriptDeclarativeClass::Object *QScriptEnginePrivate::declarativeObject(JSC::JSValue v)
+{
+    if (!QScriptEnginePrivate::isObject(v) || !v.inherits(&QScriptObject::info))
+        return 0;
+    QScriptObject *scriptObject = static_cast<QScriptObject*>(JSC::asObject(v));
+    QScriptObjectDelegate *delegate = scriptObject->delegate();
+    if (!delegate || (delegate->type() != QScriptObjectDelegate::DeclarativeClassObject))
+        return 0;
+    return static_cast<QScript::DeclarativeObjectDelegate*>(delegate)->object();
+}
+
 QT_END_NAMESPACE
 
 #endif
diff --git a/src/script/api/qscriptvalue.cpp b/src/script/api/qscriptvalue.cpp
index 5bfe46a..7f1fdaa 100644
--- a/src/script/api/qscriptvalue.cpp
+++ b/src/script/api/qscriptvalue.cpp
@@ -29,33 +29,19 @@
 #include "qscriptengine_p.h"
 #include "qscriptstring_p.h"
 
-#include "JSArray.h"
 #include "JSGlobalObject.h"
 #include "JSImmediate.h"
 #include "JSObject.h"
 #include "JSValue.h"
 #include "JSFunction.h"
-#include "DateInstance.h"
-#include "ErrorInstance.h"
-#include "RegExpObject.h"
 #include "Identifier.h"
 #include "Operations.h"
 #include "Arguments.h"
 
-#include <QtCore/qdatetime.h>
-#include <QtCore/qregexp.h>
 #include <QtCore/qvariant.h>
 #include <QtCore/qvarlengtharray.h>
 #include <QtCore/qnumeric.h>
 
-#include "utils/qscriptdate_p.h"
-#include "bridge/qscriptobject_p.h"
-#include "bridge/qscriptclassobject_p.h"
-#include "bridge/qscriptvariant_p.h"
-#include "bridge/qscriptqobject_p.h"
-#include "bridge/qscriptdeclarativeclass_p.h"
-#include "bridge/qscriptdeclarativeobject_p.h"
-
 /*!
   \since 4.3
   \class QScriptValue
@@ -180,248 +166,8 @@
     \omitvalue ResolveFull Check the object's own properties first, then search the prototype chain, and finally search the scope chain.
 */
 
-// ### move
-
-#include <QtCore/qnumeric.h>
-#include <math.h>
-
 QT_BEGIN_NAMESPACE
 
-namespace QScript
-{
-
-static const qsreal D32 = 4294967296.0;
-
-qint32 ToInt32(qsreal n)
-{
-    if (qIsNaN(n) || qIsInf(n) || (n == 0))
-        return 0;
-
-    qsreal sign = (n < 0) ? -1.0 : 1.0;
-    qsreal abs_n = fabs(n);
-
-    n = ::fmod(sign * ::floor(abs_n), D32);
-    const double D31 = D32 / 2.0;
-
-    if (sign == -1 && n < -D31)
-        n += D32;
-
-    else if (sign != -1 && n >= D31)
-        n -= D32;
-
-    return qint32 (n);
-}
-
-quint32 ToUint32(qsreal n)
-{
-    if (qIsNaN(n) || qIsInf(n) || (n == 0))
-        return 0;
-
-    qsreal sign = (n < 0) ? -1.0 : 1.0;
-    qsreal abs_n = fabs(n);
-
-    n = ::fmod(sign * ::floor(abs_n), D32);
-
-    if (n < 0)
-        n += D32;
-
-    return quint32 (n);
-}
-
-quint16 ToUint16(qsreal n)
-{
-    static const qsreal D16 = 65536.0;
-
-    if (qIsNaN(n) || qIsInf(n) || (n == 0))
-        return 0;
-
-    qsreal sign = (n < 0) ? -1.0 : 1.0;
-    qsreal abs_n = fabs(n);
-
-    n = ::fmod(sign * ::floor(abs_n), D16);
-
-    if (n < 0)
-        n += D16;
-
-    return quint16 (n);
-}
-
-qsreal ToInteger(qsreal n)
-{
-    if (qIsNaN(n))
-        return 0;
-
-    if (n == 0 || qIsInf(n))
-        return n;
-
-    int sign = n < 0 ? -1 : 1;
-    return sign * ::floor(::fabs(n));
-}
-
-} // namespace QScript
-
-QScriptValue QScriptValuePrivate::propertyHelper(const JSC::Identifier &id, int resolveMode) const
-{
-    JSC::JSValue result;
-    if (!(resolveMode & QScriptValue::ResolvePrototype)) {
-        // Look in the object's own properties
-        JSC::ExecState *exec = engine->currentFrame;
-        JSC::JSObject *object = JSC::asObject(jscValue);
-        JSC::PropertySlot slot(object);
-        if (object->getOwnPropertySlot(exec, id, slot))
-            result = slot.getValue(exec, id);
-    }
-    if (!result && (resolveMode & QScriptValue::ResolveScope)) {
-        // ### check if it's a function object and look in the scope chain
-        QScriptValue scope = property(QString::fromLatin1("__qt_scope__"), QScriptValue::ResolveLocal);
-        if (scope.isObject())
-            result = engine->scriptValueToJSCValue(QScriptValuePrivate::get(scope)->property(id, resolveMode));
-    }
-    return engine->scriptValueFromJSCValue(result);
-}
-
-QScriptValue QScriptValuePrivate::propertyHelper(quint32 index, int resolveMode) const
-{
-    JSC::JSValue result;
-    if (!(resolveMode & QScriptValue::ResolvePrototype)) {
-        // Look in the object's own properties
-        JSC::ExecState *exec = engine->currentFrame;
-        JSC::JSObject *object = JSC::asObject(jscValue);
-        JSC::PropertySlot slot(object);
-        if (object->getOwnPropertySlot(exec, index, slot))
-            result = slot.getValue(exec, index);
-    }
-    return engine->scriptValueFromJSCValue(result);
-}
-
-void QScriptValuePrivate::setProperty(const JSC::Identifier &id, const QScriptValue &value,
-                                      const QScriptValue::PropertyFlags &flags)
-{
-    QScriptEnginePrivate *valueEngine = QScriptValuePrivate::getEngine(value);
-    if (valueEngine && (valueEngine != engine)) {
-        qWarning("QScriptValue::setProperty(%s) failed: "
-                 "cannot set value created in a different engine",
-                 qPrintable(QString(id.ustring())));
-        return;
-    }
-    JSC::ExecState *exec = engine->currentFrame;
-    JSC::JSValue jsValue = engine->scriptValueToJSCValue(value);
-    JSC::JSObject *thisObject = JSC::asObject(jscValue);
-    JSC::JSValue setter = thisObject->lookupSetter(exec, id);
-    JSC::JSValue getter = thisObject->lookupGetter(exec, id);
-    if ((flags & QScriptValue::PropertyGetter) || (flags & QScriptValue::PropertySetter)) {
-        if (!jsValue) {
-            // deleting getter/setter
-            if ((flags & QScriptValue::PropertyGetter) && (flags & QScriptValue::PropertySetter)) {
-                // deleting both: just delete the property
-                thisObject->deleteProperty(exec, id, /*checkDontDelete=*/false);
-            } else if (flags & QScriptValue::PropertyGetter) {
-                // preserve setter, if there is one
-                thisObject->deleteProperty(exec, id, /*checkDontDelete=*/false);
-                if (setter && setter.isObject())
-                    thisObject->defineSetter(exec, id, JSC::asObject(setter));
-            } else { // flags & QScriptValue::PropertySetter
-                // preserve getter, if there is one
-                thisObject->deleteProperty(exec, id, /*checkDontDelete=*/false);
-                if (getter && getter.isObject())
-                    thisObject->defineGetter(exec, id, JSC::asObject(getter));
-            }
-        } else {
-            if (jsValue.isObject()) { // ### should check if it has callData()
-                // defining getter/setter
-                if (id == exec->propertyNames().underscoreProto) {
-                    qWarning("QScriptValue::setProperty() failed: "
-                             "cannot set getter or setter of native property `__proto__'");
-                } else {
-                    if (flags & QScriptValue::PropertyGetter)
-                        thisObject->defineGetter(exec, id, JSC::asObject(jsValue));
-                    if (flags & QScriptValue::PropertySetter)
-                        thisObject->defineSetter(exec, id, JSC::asObject(jsValue));
-                }
-            } else {
-                qWarning("QScriptValue::setProperty(): getter/setter must be a function");
-            }
-        }
-    } else {
-        // setting the value
-        if (getter && getter.isObject() && !(setter && setter.isObject())) {
-            qWarning("QScriptValue::setProperty() failed: "
-                     "property '%s' has a getter but no setter",
-                     qPrintable(QString(id.ustring())));
-            return;
-        }
-        if (!jsValue) {
-            // ### check if it's a getter/setter property
-            thisObject->deleteProperty(exec, id, /*checkDontDelete=*/false);
-        } else if (flags != QScriptValue::KeepExistingFlags) {
-            if (thisObject->hasOwnProperty(exec, id))
-                thisObject->deleteProperty(exec, id, /*checkDontDelete=*/false); // ### hmmm - can't we just update the attributes?
-            unsigned attribs = 0;
-            if (flags & QScriptValue::ReadOnly)
-                attribs |= JSC::ReadOnly;
-            if (flags & QScriptValue::SkipInEnumeration)
-                attribs |= JSC::DontEnum;
-            if (flags & QScriptValue::Undeletable)
-                attribs |= JSC::DontDelete;
-            attribs |= flags & QScriptValue::UserRange;
-            thisObject->putWithAttributes(exec, id, jsValue, attribs);
-        } else {
-            JSC::PutPropertySlot slot;
-            thisObject->put(exec, id, jsValue, slot);
-        }
-    }
-}
-
-QScriptValue::PropertyFlags QScriptValuePrivate::propertyFlags(const JSC::Identifier &id,
-                                                               const QScriptValue::ResolveFlags &mode) const
-{
-    JSC::ExecState *exec = engine->currentFrame;
-    JSC::JSObject *object = JSC::asObject(jscValue);
-    unsigned attribs = 0;
-    JSC::PropertyDescriptor descriptor;
-    if (object->getOwnPropertyDescriptor(exec, id, descriptor))
-        attribs = descriptor.attributes();
-    else if (!object->getPropertyAttributes(exec, id, attribs)) {
-        if ((mode & QScriptValue::ResolvePrototype) && object->prototype() && object->prototype().isObject()) {
-            QScriptValue proto = engine->scriptValueFromJSCValue(object->prototype());
-            return QScriptValuePrivate::get(proto)->propertyFlags(id, mode);
-        }
-        return 0;
-    }
-    QScriptValue::PropertyFlags result = 0;
-    if (attribs & JSC::ReadOnly)
-        result |= QScriptValue::ReadOnly;
-    if (attribs & JSC::DontEnum)
-        result |= QScriptValue::SkipInEnumeration;
-    if (attribs & JSC::DontDelete)
-        result |= QScriptValue::Undeletable;
-    //We cannot rely on attribs JSC::Setter/Getter because they are not necesserly set by JSC (bug?)
-    if (attribs & JSC::Getter || !object->lookupGetter(exec, id).isUndefinedOrNull())
-        result |= QScriptValue::PropertyGetter;
-    if (attribs & JSC::Setter || !object->lookupSetter(exec, id).isUndefinedOrNull())
-        result |= QScriptValue::PropertySetter;
-    if (attribs & QScript::QObjectMemberAttribute)
-        result |= QScriptValue::QObjectMember;
-    result |= QScriptValue::PropertyFlag(attribs & QScriptValue::UserRange);
-    return result;
-}
-
-QVariant &QScriptValuePrivate::variantValue() const
-{
-    Q_ASSERT(jscValue.inherits(&QScriptObject::info));
-    QScriptObjectDelegate *delegate = static_cast<QScriptObject*>(JSC::asObject(jscValue))->delegate();
-    Q_ASSERT(delegate && (delegate->type() == QScriptObjectDelegate::Variant));
-    return static_cast<QScript::QVariantDelegate*>(delegate)->value();
-}
-
-void QScriptValuePrivate::setVariantValue(const QVariant &value)
-{
-    Q_ASSERT(jscValue.inherits(&QScriptObject::info));
-    QScriptObjectDelegate *delegate = static_cast<QScriptObject*>(JSC::asObject(jscValue))->delegate();
-    Q_ASSERT(delegate && (delegate->type() == QScriptObjectDelegate::Variant));
-    static_cast<QScript::QVariantDelegate*>(delegate)->setValue(value);
-}
-
 void QScriptValuePrivate::detachFromEngine()
 {
     if (isJSC())
@@ -707,9 +453,9 @@ QScriptValue &QScriptValue::operator=(const QScriptValue &other)
 bool QScriptValue::isError() const
 {
     Q_D(const QScriptValue);
-    if (!d || !d->isObject())
+    if (!d || !d->isJSC())
         return false;
-    return d->jscValue.inherits(&JSC::ErrorInstance::info);
+    return QScriptEnginePrivate::isError(d->jscValue);
 }
 
 /*!
@@ -721,9 +467,9 @@ bool QScriptValue::isError() const
 bool QScriptValue::isArray() const
 {
     Q_D(const QScriptValue);
-    if (!d || !d->isObject())
+    if (!d || !d->isJSC())
         return false;
-    return d->jscValue.inherits(&JSC::JSArray::info);
+    return QScriptEnginePrivate::isArray(d->jscValue);
 }
 
 /*!
@@ -735,9 +481,9 @@ bool QScriptValue::isArray() const
 bool QScriptValue::isDate() const
 {
     Q_D(const QScriptValue);
-    if (!d || !d->isObject())
+    if (!d || !d->isJSC())
         return false;
-    return d->jscValue.inherits(&JSC::DateInstance::info);
+    return QScriptEnginePrivate::isDate(d->jscValue);
 }
 
 /*!
@@ -749,9 +495,9 @@ bool QScriptValue::isDate() const
 bool QScriptValue::isRegExp() const
 {
     Q_D(const QScriptValue);
-    if (!d || !d->isObject())
+    if (!d || !d->isJSC())
         return false;
-    return d->jscValue.inherits(&JSC::RegExpObject::info);
+    return QScriptEnginePrivate::isRegExp(d->jscValue);
 }
 
 /*!
@@ -816,7 +562,8 @@ QScriptValue QScriptValue::scope() const
     if (!d || !d->isObject())
         return QScriptValue();
     // ### make hidden property
-    return d->property(QLatin1String("__qt_scope__"), QScriptValue::ResolveLocal);
+    JSC::JSValue result = d->property(QLatin1String("__qt_scope__"), QScriptValue::ResolveLocal);
+    return d->engine->scriptValueFromJSCValue(result);
 }
 
 /*!
@@ -910,9 +657,9 @@ QScriptValue ToPrimitive(const QScriptValue &object, JSC::PreferredPrimitiveType
     Q_ASSERT(pp->engine != 0);
     JSC::ExecState *exec = pp->engine->currentFrame;
     JSC::JSValue savedException;
-    QScriptValuePrivate::saveException(exec, &savedException);
+    QScriptEnginePrivate::saveException(exec, &savedException);
     JSC::JSValue result = JSC::asObject(pp->jscValue)->toPrimitive(exec, hint);
-    QScriptValuePrivate::restoreException(exec, savedException);
+    QScriptEnginePrivate::restoreException(exec, savedException);
     return pp->engine->scriptValueFromJSCValue(result);
 }
 
@@ -1103,9 +850,9 @@ bool QScriptValue::equals(const QScriptValue &other) const
         if (eng_p) {
             JSC::ExecState *exec = eng_p->currentFrame;
             JSC::JSValue savedException;
-            QScriptValuePrivate::saveException(exec, &savedException);
+            QScriptEnginePrivate::saveException(exec, &savedException);
             bool result = JSC::JSValue::equal(exec, d->jscValue, other.d_ptr->jscValue);
-            QScriptValuePrivate::restoreException(exec, savedException);
+            QScriptEnginePrivate::restoreException(exec, savedException);
             return result;
         }
     }
@@ -1191,21 +938,10 @@ QString QScriptValue::toString() const
     switch (d->type) {
     case QScriptValuePrivate::JavaScriptCore: {
         JSC::ExecState *exec = d->engine ? d->engine->currentFrame : 0;
-        JSC::JSValue savedException;
-        QScriptValuePrivate::saveException(exec, &savedException);
-        JSC::UString str = d->jscValue.toString(exec);
-        if (exec && exec->hadException() && !str.size()) {
-            JSC::JSValue savedException2;
-            QScriptValuePrivate::saveException(exec, &savedException2);
-            str = savedException2.toString(exec);
-            QScriptValuePrivate::restoreException(exec, savedException2);
-        }
-        if (savedException)
-            QScriptValuePrivate::restoreException(exec, savedException);
-        return str;
+        return QScriptEnginePrivate::toString(exec, d->jscValue);
     }
     case QScriptValuePrivate::Number:
-        return JSC::UString::from(d->numberValue);
+        return QScript::ToString(d->numberValue);
     case QScriptValuePrivate::String:
         return d->stringValue;
     }
@@ -1232,16 +968,12 @@ qsreal QScriptValue::toNumber() const
     switch (d->type) {
     case QScriptValuePrivate::JavaScriptCore: {
         JSC::ExecState *exec = d->engine ? d->engine->currentFrame : 0;
-        JSC::JSValue savedException;
-        QScriptValuePrivate::saveException(exec, &savedException);
-        qsreal result = d->jscValue.toNumber(exec);
-        QScriptValuePrivate::restoreException(exec, savedException);
-        return result;
+        return QScriptEnginePrivate::toNumber(exec, d->jscValue);
     }
     case QScriptValuePrivate::Number:
         return d->numberValue;
     case QScriptValuePrivate::String:
-        return ((JSC::UString)d->stringValue).toDouble();
+        return QScript::ToNumber(d->stringValue);
     }
     return 0;
 }
@@ -1259,16 +991,12 @@ bool QScriptValue::toBoolean() const
     switch (d->type) {
     case QScriptValuePrivate::JavaScriptCore: {
         JSC::ExecState *exec = d->engine ? d->engine->currentFrame : 0;
-        JSC::JSValue savedException;
-        QScriptValuePrivate::saveException(exec, &savedException);
-        bool result = d->jscValue.toBoolean(exec);
-        QScriptValuePrivate::restoreException(exec, savedException);
-        return result;
+        return QScriptEnginePrivate::toBool(exec, d->jscValue);
     }
     case QScriptValuePrivate::Number:
-        return (d->numberValue != 0) && !qIsNaN(d->numberValue);
+        return QScript::ToBool(d->numberValue);
     case QScriptValuePrivate::String:
-        return (!d->stringValue.isEmpty());
+        return QScript::ToBool(d->stringValue);
     }
     return false;
 }
@@ -1295,16 +1023,12 @@ bool QScriptValue::toBool() const
     switch (d->type) {
     case QScriptValuePrivate::JavaScriptCore: {
         JSC::ExecState *exec = d->engine ? d->engine->currentFrame : 0;
-        JSC::JSValue savedException;
-        QScriptValuePrivate::saveException(exec, &savedException);
-        bool result = d->jscValue.toBoolean(exec);
-        QScriptValuePrivate::restoreException(exec, savedException);
-        return result;
+        return QScriptEnginePrivate::toBool(exec, d->jscValue);
     }
     case QScriptValuePrivate::Number:
-        return (d->numberValue != 0) && !qIsNaN(d->numberValue);
+        return QScript::ToBool(d->numberValue);
     case QScriptValuePrivate::String:
-        return (!d->stringValue.isEmpty());
+        return QScript::ToBool(d->stringValue);
     }
     return false;
 }
@@ -1329,16 +1053,12 @@ qint32 QScriptValue::toInt32() const
     switch (d->type) {
     case QScriptValuePrivate::JavaScriptCore: {
         JSC::ExecState *exec = d->engine ? d->engine->currentFrame : 0;
-        JSC::JSValue savedException;
-        QScriptValuePrivate::saveException(exec, &savedException);
-        qint32 result = d->jscValue.toInt32(exec);
-        QScriptValuePrivate::restoreException(exec, savedException);
-        return result;
+        return QScriptEnginePrivate::toInt32(exec, d->jscValue);
     }
     case QScriptValuePrivate::Number:
         return QScript::ToInt32(d->numberValue);
     case QScriptValuePrivate::String:
-        return QScript::ToInt32(((JSC::UString)d->stringValue).toDouble());
+        return QScript::ToInt32(d->stringValue);
     }
     return 0;
 }
@@ -1363,16 +1083,12 @@ quint32 QScriptValue::toUInt32() const
     switch (d->type) {
     case QScriptValuePrivate::JavaScriptCore: {
         JSC::ExecState *exec = d->engine ? d->engine->currentFrame : 0;
-        JSC::JSValue savedException;
-        QScriptValuePrivate::saveException(exec, &savedException);
-        quint32 result = d->jscValue.toUInt32(exec);
-        QScriptValuePrivate::restoreException(exec, savedException);
-        return result;
+        return QScriptEnginePrivate::toUInt32(exec, d->jscValue);
     }
     case QScriptValuePrivate::Number:
-        return QScript::ToUint32(d->numberValue);
+        return QScript::ToUInt32(d->numberValue);
     case QScriptValuePrivate::String:
-        return QScript::ToUint32(((JSC::UString)d->stringValue).toDouble());
+        return QScript::ToUInt32(d->stringValue);
     }
     return 0;
 }
@@ -1396,13 +1112,13 @@ quint16 QScriptValue::toUInt16() const
         return 0;
     switch (d->type) {
     case QScriptValuePrivate::JavaScriptCore: {
-        // ### no equivalent function in JSC
-        return QScript::ToUint16(toNumber());
+        JSC::ExecState *exec = d->engine ? d->engine->currentFrame : 0;
+        return QScriptEnginePrivate::toUInt16(exec, d->jscValue);
     }
     case QScriptValuePrivate::Number:
-        return QScript::ToUint16(d->numberValue);
+        return QScript::ToUInt16(d->numberValue);
     case QScriptValuePrivate::String:
-        return QScript::ToUint16(((JSC::UString)d->stringValue).toDouble());
+        return QScript::ToUInt16(d->stringValue);
     }
     return 0;
 }
@@ -1427,16 +1143,12 @@ qsreal QScriptValue::toInteger() const
     switch (d->type) {
     case QScriptValuePrivate::JavaScriptCore: {
         JSC::ExecState *exec = d->engine ? d->engine->currentFrame : 0;
-        JSC::JSValue savedException;
-        QScriptValuePrivate::saveException(exec, &savedException);
-        qsreal result = d->jscValue.toInteger(exec);
-        QScriptValuePrivate::restoreException(exec, savedException);
-        return result;
+        return QScriptEnginePrivate::toInteger(exec, d->jscValue);
     }
     case QScriptValuePrivate::Number:
         return QScript::ToInteger(d->numberValue);
     case QScriptValuePrivate::String:
-        return QScript::ToInteger(((JSC::UString)d->stringValue).toDouble());
+        return QScript::ToInteger(d->stringValue);
     }
     return 0;
 }
@@ -1469,40 +1181,10 @@ QVariant QScriptValue::toVariant() const
     if (!d)
         return QVariant();
     switch (d->type) {
-    case QScriptValuePrivate::JavaScriptCore:
-        if (isObject()) {
-            if (isVariant())
-                return d->variantValue();
-#ifndef QT_NO_QOBJECT
-            else if (isQObject())
-                return qVariantFromValue(toQObject());
-#endif
-            else if (isDate())
-                return QVariant(toDateTime());
-#ifndef QT_NO_REGEXP
-            else if (isRegExp())
-                return QVariant(toRegExp());
-#endif
-            else if (isArray())
-                return QScriptEnginePrivate::variantListFromArray(*this);
-            else if (QScriptDeclarativeClass *dc = QScriptDeclarativeClass::scriptClass(*this))
-                return dc->toVariant(QScriptDeclarativeClass::object(*this));
-            // try to convert to primitive
-            JSC::ExecState *exec = d->engine->currentFrame;
-            JSC::JSValue savedException;
-            QScriptValuePrivate::saveException(exec, &savedException);
-            JSC::JSValue prim = d->jscValue.toPrimitive(exec);
-            QScriptValuePrivate::restoreException(exec, savedException);
-            if (!prim.isObject())
-                return d->engine->scriptValueFromJSCValue(prim).toVariant();
-        } else if (isNumber()) {
-            return QVariant(toNumber());
-        } else if (isString()) {
-            return QVariant(toString());
-        } else if (isBool()) {
-            return QVariant(toBool());
-        }
-        return QVariant();
+    case QScriptValuePrivate::JavaScriptCore: {
+        JSC::ExecState *exec = d->engine ? d->engine->currentFrame : 0;
+        return QScriptEnginePrivate::toVariant(exec, d->jscValue);
+    }
     case QScriptValuePrivate::Number:
         return QVariant(d->numberValue);
     case QScriptValuePrivate::String:
@@ -1534,10 +1216,9 @@ QScriptValue QScriptValue::toObject() const
 QDateTime QScriptValue::toDateTime() const
 {
     Q_D(const QScriptValue);
-    if (!isDate())
+    if (!d || !d->engine)
         return QDateTime();
-    qsreal t = static_cast<JSC::DateInstance*>(JSC::asObject(d->jscValue))->internalNumber();
-    return QScript::ToDateTime(t, Qt::LocalTime);
+    return QScriptEnginePrivate::toDateTime(d->engine->currentFrame, d->jscValue);
 }
 
 #ifndef QT_NO_REGEXP
@@ -1551,13 +1232,9 @@ QDateTime QScriptValue::toDateTime() const
 QRegExp QScriptValue::toRegExp() const
 {
     Q_D(const QScriptValue);
-    if (!isRegExp())
-        return QRegExp();
-    QString pattern = d->property(QLatin1String("source"), QScriptValue::ResolvePrototype).toString();
-    Qt::CaseSensitivity kase = Qt::CaseSensitive;
-    if (d->property(QLatin1String("ignoreCase"), QScriptValue::ResolvePrototype).toBool())
-        kase = Qt::CaseInsensitive;
-    return QRegExp(pattern, kase, QRegExp::RegExp2);
+    if (!d || !d->engine)
+         return QRegExp();
+    return QScriptEnginePrivate::toRegExp(d->engine->currentFrame, d->jscValue);
 }
 #endif // QT_NO_REGEXP
 
@@ -1574,19 +1251,9 @@ QRegExp QScriptValue::toRegExp() const
 QObject *QScriptValue::toQObject() const
 {
     Q_D(const QScriptValue);
-    if (isQObject()) {
-        QScriptObject *object = static_cast<QScriptObject*>(JSC::asObject(d->jscValue));
-        QScriptObjectDelegate *delegate = object->delegate();
-        if (delegate->type() == QScriptObjectDelegate::DeclarativeClassObject)
-            return static_cast<QScript::DeclarativeObjectDelegate*>(delegate)->scriptClass()->toQObject(QScriptDeclarativeClass::object(*this));
-        return static_cast<QScript::QObjectDelegate*>(delegate)->value();
-    } else if (isVariant()) {
-        QVariant var = toVariant();
-        int type = var.userType();
-        if ((type == QMetaType::QObjectStar) || (type == QMetaType::QWidgetStar))
-            return *reinterpret_cast<QObject* const *>(var.constData());
-    }
-    return 0;
+    if (!d || !d->engine)
+        return 0;
+    return QScriptEnginePrivate::toQObject(d->engine->currentFrame, d->jscValue);
 }
 
 /*!
@@ -1598,9 +1265,9 @@ QObject *QScriptValue::toQObject() const
 const QMetaObject *QScriptValue::toQMetaObject() const
 {
     Q_D(const QScriptValue);
-    if (isQMetaObject())
-        return static_cast<QScript::QMetaObjectWrapperObject*>(JSC::asObject(d->jscValue))->value();
-    return 0;
+    if (!d || !d->engine)
+        return 0;
+    return QScriptEnginePrivate::toQMetaObject(d->engine->currentFrame, d->jscValue);
 }
 
 /*!
@@ -1634,8 +1301,15 @@ void QScriptValue::setProperty(const QString &name, const QScriptValue &value,
     Q_D(QScriptValue);
     if (!d || !d->isObject())
         return;
-    JSC::ExecState *exec = d->engine->currentFrame;
-    d->setProperty(JSC::Identifier(exec, name), value, flags);
+    QScriptEnginePrivate *valueEngine = QScriptValuePrivate::getEngine(value);
+    if (valueEngine && (valueEngine != d->engine)) {
+        qWarning("QScriptValue::setProperty(%s) failed: "
+                 "cannot set value created in a different engine",
+                 qPrintable(name));
+        return;
+    }
+    JSC::JSValue jsValue = d->engine->scriptValueToJSCValue(value);
+    d->setProperty(name, jsValue, flags);
 }
 
 /*!
@@ -1659,7 +1333,7 @@ QScriptValue QScriptValue::property(const QString &name,
     Q_D(const QScriptValue);
     if (!d || !d->isObject())
         return QScriptValue();
-    return d->property(name, mode);
+    return d->engine->scriptValueFromJSCValue(d->property(name, mode));
 }
 
 /*!
@@ -1681,7 +1355,7 @@ QScriptValue QScriptValue::property(quint32 arrayIndex,
     Q_D(const QScriptValue);
     if (!d || !d->isObject())
         return QScriptValue();
-    return d->property(arrayIndex, mode);
+    return d->engine->scriptValueFromJSCValue(d->property(arrayIndex, mode));
 }
 
 /*!
@@ -1708,33 +1382,8 @@ void QScriptValue::setProperty(quint32 arrayIndex, const QScriptValue &value,
                  "cannot set value created in a different engine");
         return;
     }
-    JSC::ExecState *exec = d->engine->currentFrame;
-    JSC::JSValue jscValue = d->engine->scriptValueToJSCValue(value);
-    if (!jscValue) {
-        JSC::asObject(d->jscValue)->deleteProperty(exec, arrayIndex, /*checkDontDelete=*/false);
-    } else {
-        if ((flags & QScriptValue::PropertyGetter) || (flags & QScriptValue::PropertySetter)) {
-            // fall back to string-based setProperty(), since there is no
-            // JSC::JSObject::defineGetter(unsigned)
-            d->setProperty(JSC::Identifier::from(exec, arrayIndex), value, flags);
-        } else {
-            if (flags != QScriptValue::KeepExistingFlags) {
-//                if (JSC::asObject(d->jscValue)->hasOwnProperty(exec, arrayIndex))
-//                    JSC::asObject(d->jscValue)->deleteProperty(exec, arrayIndex);
-                unsigned attribs = 0;
-                if (flags & QScriptValue::ReadOnly)
-                    attribs |= JSC::ReadOnly;
-                if (flags & QScriptValue::SkipInEnumeration)
-                    attribs |= JSC::DontEnum;
-                if (flags & QScriptValue::Undeletable)
-                    attribs |= JSC::DontDelete;
-                attribs |= flags & QScriptValue::UserRange;
-                JSC::asObject(d->jscValue)->putWithAttributes(exec, arrayIndex, jscValue, attribs);
-            } else {
-                JSC::asObject(d->jscValue)->put(exec, arrayIndex, jscValue);
-            }
-        }
-    }
+    JSC::JSValue jsValue = d->engine->scriptValueToJSCValue(value);
+    d->setProperty(arrayIndex, jsValue, flags);
 }
 
 /*!
@@ -1755,7 +1404,7 @@ QScriptValue QScriptValue::property(const QScriptString &name,
     Q_D(const QScriptValue);
     if (!d || !d->isObject() || !QScriptStringPrivate::isValid(name))
         return QScriptValue();
-    return d->property(name.d_ptr->identifier, mode);
+    return d->engine->scriptValueFromJSCValue(d->property(name.d_ptr->identifier, mode));
 }
 
 /*!
@@ -1778,7 +1427,15 @@ void QScriptValue::setProperty(const QScriptString &name,
     Q_D(QScriptValue);
     if (!d || !d->isObject() || !QScriptStringPrivate::isValid(name))
         return;
-    d->setProperty(name.d_ptr->identifier, value, flags);
+    QScriptEnginePrivate *valueEngine = QScriptValuePrivate::getEngine(value);
+    if (valueEngine && (valueEngine != d->engine)) {
+        qWarning("QScriptValue::setProperty(%s) failed: "
+                 "cannot set value created in a different engine",
+                 qPrintable(name.toString()));
+        return;
+    }
+    JSC::JSValue jsValue = d->engine->scriptValueToJSCValue(value);
+    d->setProperty(name.d_ptr->identifier, jsValue, flags);
 }
 
 /*!
@@ -1882,12 +1539,12 @@ QScriptValue QScriptValue::call(const QScriptValue &thisObject,
     JSC::ArgList jscArgs(argsVector.data(), argsVector.size());
 
     JSC::JSValue savedException;
-    QScriptValuePrivate::saveException(exec, &savedException);
+    QScriptEnginePrivate::saveException(exec, &savedException);
     JSC::JSValue result = JSC::call(exec, callee, callType, callData, jscThisObject, jscArgs);
     if (exec->hadException()) {
         result = exec->exception();
     } else {
-        QScriptValuePrivate::restoreException(exec, savedException);
+        QScriptEnginePrivate::restoreException(exec, savedException);
     }
     return d->engine->scriptValueFromJSCValue(result);
 }
@@ -1963,12 +1620,12 @@ QScriptValue QScriptValue::call(const QScriptValue &thisObject,
     }
 
     JSC::JSValue savedException;
-    QScriptValuePrivate::saveException(exec, &savedException);
+    QScriptEnginePrivate::saveException(exec, &savedException);
     JSC::JSValue result = JSC::call(exec, callee, callType, callData, jscThisObject, applyArgs);
     if (exec->hadException()) {
         result = exec->exception();
     } else {
-        QScriptValuePrivate::restoreException(exec, savedException);
+        QScriptEnginePrivate::restoreException(exec, savedException);
     }
     return d->engine->scriptValueFromJSCValue(result);
 }
@@ -2015,12 +1672,12 @@ QScriptValue QScriptValue::construct(const QScriptValueList &args)
     JSC::ArgList jscArgs(argsVector.data(), argsVector.size());
 
     JSC::JSValue savedException;
-    QScriptValuePrivate::saveException(exec, &savedException);
+    QScriptEnginePrivate::saveException(exec, &savedException);
     JSC::JSObject *result = JSC::construct(exec, callee, constructType, constructData, jscArgs);
     if (exec->hadException()) {
         result = JSC::asObject(exec->exception());
     } else {
-        QScriptValuePrivate::restoreException(exec, savedException);
+        QScriptEnginePrivate::restoreException(exec, savedException);
     }
     return d->engine->scriptValueFromJSCValue(result);
 }
@@ -2074,13 +1731,13 @@ QScriptValue QScriptValue::construct(const QScriptValue &arguments)
     }
 
     JSC::JSValue savedException;
-    QScriptValuePrivate::saveException(exec, &savedException);
+    QScriptEnginePrivate::saveException(exec, &savedException);
     JSC::JSObject *result = JSC::construct(exec, callee, constructType, constructData, applyArgs);
     if (exec->hadException()) {
         if (exec->exception().isObject())
             result = JSC::asObject(exec->exception());
     } else {
-        QScriptValuePrivate::restoreException(exec, savedException);
+        QScriptEnginePrivate::restoreException(exec, savedException);
     }
     return d->engine->scriptValueFromJSCValue(result);
 }
@@ -2229,11 +1886,9 @@ bool QScriptValue::isObject() const
 bool QScriptValue::isVariant() const
 {
     Q_D(const QScriptValue);
-    if (!d || !d->isJSC() || !d->jscValue.inherits(&QScriptObject::info))
+    if (!d || !d->isJSC())
         return false;
-    QScriptObject *object = static_cast<QScriptObject*>(JSC::asObject(d->jscValue));
-    QScriptObjectDelegate *delegate = object->delegate();
-    return (delegate && (delegate->type() == QScriptObjectDelegate::Variant));
+    return QScriptEnginePrivate::isVariant(d->jscValue);
 }
 
 /*!
@@ -2248,13 +1903,9 @@ bool QScriptValue::isVariant() const
 bool QScriptValue::isQObject() const
 {
     Q_D(const QScriptValue);
-    if (!d || !d->isJSC() || !d->jscValue.inherits(&QScriptObject::info))
+    if (!d || !d->isJSC())
         return false;
-    QScriptObject *object = static_cast<QScriptObject*>(JSC::asObject(d->jscValue));
-    QScriptObjectDelegate *delegate = object->delegate();
-    return (delegate && (delegate->type() == QScriptObjectDelegate::QtObject ||
-                         (delegate->type() == QScriptObjectDelegate::DeclarativeClassObject &&
-                          static_cast<QScript::DeclarativeObjectDelegate*>(delegate)->scriptClass()->isQObject())));
+    return QScriptEnginePrivate::isQObject(d->jscValue);
 }
 
 /*!
@@ -2266,9 +1917,9 @@ bool QScriptValue::isQObject() const
 bool QScriptValue::isQMetaObject() const
 {
     Q_D(const QScriptValue);
-    if (!d || !d->isObject())
+    if (!d || !d->isJSC())
         return false;
-    return JSC::asObject(d->jscValue)->inherits(&QScript::QMetaObjectWrapperObject::info);
+    return QScriptEnginePrivate::isQMetaObject(d->jscValue);
 }
 
 /*!
@@ -2299,7 +1950,7 @@ QScriptValue QScriptValue::data() const
         return d->engine->scriptValueFromJSCValue(scriptObject->data());
     } else {
         // ### make hidden property
-        return d->property(QLatin1String("__qt_data__"), QScriptValue::ResolveLocal);
+        return property(QLatin1String("__qt_data__"), QScriptValue::ResolveLocal);
     }
 }
 
diff --git a/src/script/api/qscriptvalue_p.h b/src/script/api/qscriptvalue_p.h
index 7440d21..77b7330 100644
--- a/src/script/api/qscriptvalue_p.h
+++ b/src/script/api/qscriptvalue_p.h
@@ -69,9 +69,6 @@ public:
     inline bool isJSC() const;
     inline bool isObject() const;
 
-    QVariant &variantValue() const;
-    void setVariantValue(const QVariant &value);
-
     static inline QScriptValuePrivate *get(const QScriptValue &q)
     {
         return q.d_ptr.data();
@@ -89,14 +86,16 @@ public:
         return q.d_ptr->engine;
     }
 
-    inline QScriptValue property(const JSC::Identifier &id, int resolveMode) const;
-    QScriptValue propertyHelper(const JSC::Identifier &id, int resolveMode) const;
-    inline QScriptValue property(quint32 index, int resolveMode) const;
-    QScriptValue propertyHelper(quint32, int resolveMode) const;
-    inline QScriptValue property(const QString &, int resolveMode) const;
-    void setProperty(const JSC::Identifier &id, const QScriptValue &value,
-                     const QScriptValue::PropertyFlags &flags);
-    QScriptValue::PropertyFlags propertyFlags(
+    inline JSC::JSValue property(const JSC::Identifier &id, int resolveMode) const;
+    inline JSC::JSValue property(quint32 index, int resolveMode) const;
+    inline JSC::JSValue property(const QString &, int resolveMode) const;
+    inline void setProperty(const QString &name, const JSC::JSValue &value,
+                            const QScriptValue::PropertyFlags &flags);
+    inline void setProperty(const JSC::Identifier &id, const JSC::JSValue &value,
+                            const QScriptValue::PropertyFlags &flags);
+    inline void setProperty(quint32 index, const JSC::JSValue &value,
+                            const QScriptValue::PropertyFlags &flags);
+    inline QScriptValue::PropertyFlags propertyFlags(
         const JSC::Identifier &id, const QScriptValue::ResolveFlags &mode) const;
 
     void detachFromEngine();
@@ -109,9 +108,6 @@ public:
             return -1;
     }
 
-    static inline void saveException(JSC::ExecState*, JSC::JSValue*);
-    static inline void restoreException(JSC::ExecState*, JSC::JSValue);
-
     QScriptEnginePrivate *engine;
     Type type;
     JSC::JSValue jscValue;
diff --git a/src/script/bridge/qscriptclassobject.cpp b/src/script/bridge/qscriptclassobject.cpp
index a3dd239..ce0a08e 100644
--- a/src/script/bridge/qscriptclassobject.cpp
+++ b/src/script/bridge/qscriptclassobject.cpp
@@ -206,7 +206,7 @@ JSC::JSValue JSC_HOST_CALL ClassObjectDelegate::call(JSC::ExecState *exec, JSC::
     QVariant result = scriptClass->extension(QScriptClass::Callable, qVariantFromValue(ctx));
     eng_p->popContext();
     eng_p->currentFrame = oldFrame;
-    return eng_p->jscValueFromVariant(result);
+    return QScriptEnginePrivate::jscValueFromVariant(exec, result);
 }
 
 JSC::ConstructType ClassObjectDelegate::getConstructData(QScriptObject*, JSC::ConstructData &constructData)
diff --git a/src/script/bridge/qscriptdeclarativeclass.cpp b/src/script/bridge/qscriptdeclarativeclass.cpp
index ce2fc23..1d11ede 100644
--- a/src/script/bridge/qscriptdeclarativeclass.cpp
+++ b/src/script/bridge/qscriptdeclarativeclass.cpp
@@ -207,25 +207,17 @@ QScriptDeclarativeClass::newObjectValue(QScriptEngine *engine,
 QScriptDeclarativeClass *QScriptDeclarativeClass::scriptClass(const QScriptValue &v)
 {
     QScriptValuePrivate *d = QScriptValuePrivate::get(v);
-    if (!d || !d->isJSC() || !d->jscValue.inherits(&QScriptObject::info))
+    if (!d || !d->isJSC())
         return 0;
-    QScriptObject *scriptObject = static_cast<QScriptObject*>(JSC::asObject(d->jscValue));
-    QScriptObjectDelegate *delegate = scriptObject->delegate();
-    if (!delegate || (delegate->type() != QScriptObjectDelegate::DeclarativeClassObject))
-        return 0;
-    return static_cast<QScript::DeclarativeObjectDelegate*>(delegate)->scriptClass();
+    return QScriptEnginePrivate::declarativeClass(d->jscValue);
 }
 
 QScriptDeclarativeClass::Object *QScriptDeclarativeClass::object(const QScriptValue &v)
 {
     QScriptValuePrivate *d = QScriptValuePrivate::get(v);
-    if (!d || !d->isJSC() || !d->jscValue.inherits(&QScriptObject::info))
-        return 0;
-    QScriptObject *scriptObject = static_cast<QScriptObject*>(JSC::asObject(d->jscValue));
-    QScriptObjectDelegate *delegate = scriptObject->delegate();
-    if (!delegate || (delegate->type() != QScriptObjectDelegate::DeclarativeClassObject))
+    if (!d || !d->isJSC())
         return 0;
-    return static_cast<QScript::DeclarativeObjectDelegate*>(delegate)->object();
+    return QScriptEnginePrivate::declarativeObject(d->jscValue);
 }
 
 QScriptValue QScriptDeclarativeClass::function(const QScriptValue &v, const Identifier &name)
diff --git a/src/script/bridge/qscriptqobject.cpp b/src/script/bridge/qscriptqobject.cpp
index db312bc..30e5a26 100644
--- a/src/script/bridge/qscriptqobject.cpp
+++ b/src/script/bridge/qscriptqobject.cpp
@@ -169,17 +169,15 @@ static inline QByteArray methodName(const QMetaMethod &method)
     return signature.left(signature.indexOf('('));
 }
 
-static QVariant variantFromValue(QScriptEnginePrivate *eng,
-                                 int targetType, const QScriptValue &value)
+static QVariant variantFromValue(JSC::ExecState *exec, int targetType, JSC::JSValue value)
 {
     QVariant v(targetType, (void *)0);
-    Q_ASSERT(eng);
-    if (QScriptEnginePrivate::convert(value, targetType, v.data(), eng))
+    if (QScriptEnginePrivate::convertValue(exec, value, targetType, v.data()))
         return v;
     if (uint(targetType) == QVariant::LastType)
-        return value.toVariant();
-    if (value.isVariant()) {
-        v = value.toVariant();
+        return QScriptEnginePrivate::toVariant(exec, value);
+    if (QScriptEnginePrivate::isVariant(value)) {
+        v = QScriptEnginePrivate::variantValue(value);
         if (v.canConvert(QVariant::Type(targetType))) {
             v.convert(QVariant::Type(targetType));
             return v;
@@ -591,38 +589,38 @@ static JSC::JSValue callQtMethod(JSC::ExecState *exec, QMetaMethod::MethodType c
         bool converted = true;
         int matchDistance = 0;
         for (int i = 0; converted && i < mtd.argumentCount(); ++i) {
-            QScriptValue actual;
+            JSC::JSValue actual;
             if (i < (int)scriptArgs.size())
-                actual = engine->scriptValueFromJSCValue(scriptArgs.at(i));
+                actual = scriptArgs.at(i);
             else
-                actual = QScriptValue(QScriptValue::UndefinedValue);
+                actual = JSC::jsUndefined();
             QScriptMetaType argType = mtd.argumentType(i);
             int tid = -1;
             QVariant v;
             if (argType.isUnresolved()) {
                 v = QVariant(QMetaType::QObjectStar, (void *)0);
-                converted = engine->convertToNativeQObject(
-                    actual, argType.name(), reinterpret_cast<void* *>(v.data()));
+                converted = QScriptEnginePrivate::convertToNativeQObject(
+                    exec, actual, argType.name(), reinterpret_cast<void* *>(v.data()));
             } else if (argType.isVariant()) {
-                if (actual.isVariant()) {
-                    v = actual.toVariant();
+                if (QScriptEnginePrivate::isVariant(actual)) {
+                    v = QScriptEnginePrivate::variantValue(actual);
                 } else {
-                    v = actual.toVariant();
+                    v = QScriptEnginePrivate::toVariant(exec, actual);
                     converted = v.isValid() || actual.isUndefined() || actual.isNull();
                 }
             } else {
                 tid = argType.typeId();
                 v = QVariant(tid, (void *)0);
-                converted = QScriptEnginePrivate::convert(actual, tid, v.data(), engine);
+                converted = QScriptEnginePrivate::convertValue(exec, actual, tid, v.data());
                 if (exec->hadException())
                     return exec->exception();
             }
 
             if (!converted) {
-                if (actual.isVariant()) {
+                if (QScriptEnginePrivate::isVariant(actual)) {
                     if (tid == -1)
                         tid = argType.typeId();
-                    QVariant vv = actual.toVariant();
+                    QVariant vv = QScriptEnginePrivate::variantValue(actual);
                     if (vv.canConvert(QVariant::Type(tid))) {
                         v = vv;
                         converted = v.convert(QVariant::Type(tid));
@@ -649,14 +647,14 @@ static JSC::JSValue callQtMethod(JSC::ExecState *exec, QMetaMethod::MethodType c
                     }
                     if (m.isValid()) {
                         if (actual.isNumber()) {
-                            int ival = actual.toInt32();
+                            int ival = QScriptEnginePrivate::toInt32(exec, actual);
                             if (m.valueToKey(ival) != 0) {
                                 qVariantSetValue(v, ival);
                                 converted = true;
                                 matchDistance += 10;
                             }
                         } else {
-                            QString sval = actual.toString();
+                            QString sval = QScriptEnginePrivate::toString(exec, actual);
                             int ival = m.keyToValue(sval.toLatin1());
                             if (ival != -1) {
                                 qVariantSetValue(v, ival);
@@ -718,7 +716,7 @@ static JSC::JSValue callQtMethod(JSC::ExecState *exec, QMetaMethod::MethodType c
                         matchDistance += 10;
                         break;
                     }
-                } else if (actual.isDate()) {
+                } else if (QScriptEnginePrivate::isDate(actual)) {
                     switch (tid) {
                     case QMetaType::QDateTime:
                         // perfect
@@ -733,7 +731,7 @@ static JSC::JSValue callQtMethod(JSC::ExecState *exec, QMetaMethod::MethodType c
                         matchDistance += 10;
                         break;
                     }
-                } else if (actual.isRegExp()) {
+                } else if (QScriptEnginePrivate::isRegExp(actual)) {
                     switch (tid) {
                     case QMetaType::QRegExp:
                         // perfect
@@ -742,14 +740,14 @@ static JSC::JSValue callQtMethod(JSC::ExecState *exec, QMetaMethod::MethodType c
                         matchDistance += 10;
                         break;
                     }
-                } else if (actual.isVariant()) {
+                } else if (QScriptEnginePrivate::isVariant(actual)) {
                     if (argType.isVariant()
-                        || (actual.toVariant().userType() == tid)) {
+                        || (QScriptEnginePrivate::toVariant(exec, actual).userType() == tid)) {
                         // perfect
                     } else {
                         matchDistance += 10;
                     }
-                } else if (actual.isArray()) {
+                } else if (QScriptEnginePrivate::isArray(actual)) {
                     switch (tid) {
                     case QMetaType::QStringList:
                     case QMetaType::QVariantList:
@@ -759,7 +757,7 @@ static JSC::JSValue callQtMethod(JSC::ExecState *exec, QMetaMethod::MethodType c
                         matchDistance += 10;
                         break;
                     }
-                } else if (actual.isQObject()) {
+                } else if (QScriptEnginePrivate::isQObject(actual)) {
                     switch (tid) {
                     case QMetaType::QObjectStar:
                     case QMetaType::QWidgetStar:
@@ -953,13 +951,11 @@ static JSC::JSValue callQtMethod(JSC::ExecState *exec, QMetaMethod::MethodType c
             } else {
                 QScriptMetaType retType = chosenMethod.returnType();
                 if (retType.isVariant()) {
-                    result = engine->jscValueFromVariant(*(QVariant *)params[0]);
+                    result = QScriptEnginePrivate::jscValueFromVariant(exec, *(QVariant *)params[0]);
                 } else if (retType.typeId() != 0) {
-                    result = engine->scriptValueToJSCValue(engine->create(retType.typeId(), params[0]));
-                    if (!result) {
-                        QScriptValue sv = QScriptEnginePrivate::get(engine)->newVariant(QVariant(retType.typeId(), params[0]));
-                        result = engine->scriptValueToJSCValue(sv);
-                    }
+                    result = QScriptEnginePrivate::create(exec, retType.typeId(), params[0]);
+                    if (!result)
+                        result = engine->newVariant(QVariant(retType.typeId(), params[0]));
                 } else {
                     result = JSC::jsUndefined();
                 }
@@ -1065,15 +1061,13 @@ JSC::JSValue QtPropertyFunction::execute(JSC::ExecState *exec,
 {
     JSC::JSValue result = JSC::jsUndefined();
 
-    // ### don't go via QScriptValue
     QScriptEnginePrivate *engine = scriptEngineFromExec(exec);
     thisValue = engine->toUsableValue(thisValue);
-    QScriptValue object = engine->scriptValueFromJSCValue(thisValue);
-    QObject *qobject = object.toQObject();
+    QObject *qobject = QScriptEnginePrivate::toQObject(exec, thisValue);
     while ((!qobject || (qobject->metaObject() != data->meta))
-           && object.prototype().isObject()) {
-        object = object.prototype();
-        qobject = object.toQObject();
+        && JSC::asObject(thisValue)->prototype().isObject()) {
+        thisValue = JSC::asObject(thisValue)->prototype();
+        qobject = QScriptEnginePrivate::toQObject(exec, thisValue);
     }
     Q_ASSERT_X(qobject, Q_FUNC_INFO, "this-object must be a QObject");
 
@@ -1094,7 +1088,7 @@ JSC::JSValue QtPropertyFunction::execute(JSC::ExecState *exec,
             if (scriptable)
                 QScriptablePrivate::get(scriptable)->engine = oldEngine;
 
-            result = engine->jscValueFromVariant(v);
+            result = QScriptEnginePrivate::jscValueFromVariant(exec, v);
         }
     } else {
         // set
@@ -1106,9 +1100,7 @@ JSC::JSValue QtPropertyFunction::execute(JSC::ExecState *exec,
             // string to enum value
             v = (QString)arg.toString(exec);
         } else {
-            // ### don't go via QScriptValue
-            QScriptValue tmp = engine->scriptValueFromJSCValue(arg);
-            v = variantFromValue(engine, prop.userType(), tmp);
+            v = variantFromValue(exec, prop.userType(), arg);
         }
 
         QScriptable *scriptable = scriptableFromQObject(qobject);
@@ -1237,7 +1229,7 @@ bool QObjectDelegate::getOwnPropertySlot(QScriptObject *object, JSC::ExecState *
                     if (!prop.isValid())
                         val = JSC::jsUndefined();
                     else
-                        val = eng->jscValueFromVariant(prop.read(qobject));
+                        val = QScriptEnginePrivate::jscValueFromVariant(exec, prop.read(qobject));
                     slot.setValue(val);
                 }
                 return true;
@@ -1247,7 +1239,7 @@ bool QObjectDelegate::getOwnPropertySlot(QScriptObject *object, JSC::ExecState *
 
     index = qobject->dynamicPropertyNames().indexOf(name);
     if (index != -1) {
-        JSC::JSValue val = eng->jscValueFromVariant(qobject->property(name));
+        JSC::JSValue val = QScriptEnginePrivate::jscValueFromVariant(exec, qobject->property(name));
         slot.setValue(val);
         return true;
     }
@@ -1274,8 +1266,7 @@ bool QObjectDelegate::getOwnPropertySlot(QScriptObject *object, JSC::ExecState *
             QObject *child = children.at(index);
             if (child->objectName() == QString(propertyName.ustring())) {
                 QScriptEngine::QObjectWrapOptions opt = QScriptEngine::PreferExistingWrapperObject;
-                QScriptValue tmp = QScriptEnginePrivate::get(eng)->newQObject(child, QScriptEngine::QtOwnership, opt);
-                slot.setValue(eng->scriptValueToJSCValue(tmp));
+                slot.setValue(eng->newQObject(child, QScriptEngine::QtOwnership, opt));
                 return true;
             }
         }
@@ -1370,7 +1361,7 @@ bool QObjectDelegate::getOwnPropertyDescriptor(QScriptObject *object, JSC::ExecS
                     if (!prop.isValid())
                         val = JSC::jsUndefined();
                     else
-                        val = eng->jscValueFromVariant(prop.read(qobject));
+                        val = QScriptEnginePrivate::jscValueFromVariant(exec, prop.read(qobject));
                     descriptor.setDescriptor(val, attributes);
                 }
                 return true;
@@ -1380,7 +1371,7 @@ bool QObjectDelegate::getOwnPropertyDescriptor(QScriptObject *object, JSC::ExecS
 
     index = qobject->dynamicPropertyNames().indexOf(name);
     if (index != -1) {
-        JSC::JSValue val = eng->jscValueFromVariant(qobject->property(name));
+        JSC::JSValue val = QScriptEnginePrivate::jscValueFromVariant(exec, qobject->property(name));
         descriptor.setDescriptor(val, QObjectMemberAttribute);
         return true;
     }
@@ -1410,8 +1401,8 @@ bool QObjectDelegate::getOwnPropertyDescriptor(QScriptObject *object, JSC::ExecS
             QObject *child = children.at(index);
             if (child->objectName() == QString(propertyName.ustring())) {
                 QScriptEngine::QObjectWrapOptions opt = QScriptEngine::PreferExistingWrapperObject;
-                QScriptValue tmp = QScriptEnginePrivate::get(eng)->newQObject(child, QScriptEngine::QtOwnership, opt);
-                descriptor.setDescriptor(eng->scriptValueToJSCValue(tmp), JSC::ReadOnly | JSC::DontDelete | JSC::DontEnum);
+                descriptor.setDescriptor(eng->newQObject(child, QScriptEngine::QtOwnership, opt),
+                                         JSC::ReadOnly | JSC::DontDelete | JSC::DontEnum);
                 return true;
             }
         }
@@ -1490,7 +1481,7 @@ void QObjectDelegate::put(QScriptObject *object, JSC::ExecState* exec,
                         // string to enum value
                         v = (QString)value.toString(exec);
                     } else {
-                        v = eng->jscValueToVariant(value, prop.userType());
+                        v = QScriptEnginePrivate::jscValueToVariant(exec, value, prop.userType());
                     }
                     (void)prop.write(qobject, v);
                 }
@@ -1512,7 +1503,7 @@ void QObjectDelegate::put(QScriptObject *object, JSC::ExecState* exec,
 
     index = qobject->dynamicPropertyNames().indexOf(name);
     if ((index != -1) || (opt & QScriptEngine::AutoCreateDynamicProperties)) {
-        QVariant v = eng->scriptValueFromJSCValue(value).toVariant();
+        QVariant v = QScriptEnginePrivate::toVariant(exec, value);
         (void)qobject->setProperty(name, v);
         return;
     }
@@ -2178,24 +2169,23 @@ void QObjectConnectionManager::execute(int slotIndex, void **argv)
     JSC::ExecState *exec = engine->currentFrame;
     QVarLengthArray<JSC::JSValue, 8> argsVector(argc);
     for (int i = 0; i < argc; ++i) {
-        // ### optimize -- no need to convert via QScriptValue
-        QScriptValue actual;
+        JSC::JSValue actual;
         void *arg = argv[i + 1];
         QByteArray typeName = parameterTypes.at(i);
         int argType = QMetaType::type(parameterTypes.at(i));
         if (!argType) {
             if (typeName == "QVariant") {
-                actual = engine->scriptValueFromVariant(*reinterpret_cast<QVariant*>(arg));
+                actual = QScriptEnginePrivate::jscValueFromVariant(exec, *reinterpret_cast<QVariant*>(arg));
             } else {
                 qWarning("QScriptEngine: Unable to handle unregistered datatype '%s' "
                          "when invoking handler of signal %s::%s",
                          typeName.constData(), meta->className(), method.signature());
-                actual = QScriptValue(QScriptValue::UndefinedValue);
+                actual = JSC::jsUndefined();
             }
         } else {
-            actual = engine->create(argType, arg);
+            actual = QScriptEnginePrivate::create(exec, argType, arg);
         }
-        argsVector[i] = engine->scriptValueToJSCValue(actual);
+        argsVector[i] = actual;
     }
     JSC::ArgList jscArgs(argsVector.data(), argsVector.size());
 
diff --git a/src/script/bridge/qscriptvariant.cpp b/src/script/bridge/qscriptvariant.cpp
index 0287d24..b4f0365 100644
--- a/src/script/bridge/qscriptvariant.cpp
+++ b/src/script/bridge/qscriptvariant.cpp
@@ -133,7 +133,7 @@ static JSC::JSValue JSC_HOST_CALL variantProtoFuncToString(JSC::ExecState *exec,
 bool QVariantDelegate::compareToObject(QScriptObject *, JSC::ExecState *exec, JSC::JSObject *o2)
 {
     const QVariant &variant1 = value();
-    return variant1 == scriptEngineFromExec(exec)->scriptValueFromJSCValue(o2).toVariant();
+    return variant1 == QScriptEnginePrivate::toVariant(exec, o2);
 }
 
 QVariantPrototype::QVariantPrototype(JSC::ExecState* exec, WTF::PassRefPtr<JSC::Structure> structure,