Clean up.

 Get rid of conversion functions QScript::qtStringFromJSCUString and
 QScript::qtStringToJSCUString. Code was moved to cast operators.

  Reviewed-by: Kent Hansen

11 files changed, 81 insertions, 104 deletions

diff --git a/src/script/api/qscriptcontext.cpp b/src/script/api/qscriptcontext.cpp
index e213f3b..229c8ab 100644
--- a/src/script/api/qscriptcontext.cpp
+++ b/src/script/api/qscriptcontext.cpp
@@ -221,7 +221,7 @@ QScriptValue QScriptContext::throwError(Error error, const QString &text)
         jscError = JSC::URIError;
         break;
     }
-    JSC::JSObject *result = JSC::throwError(frame, jscError, QScript::qtStringToJSCUString(text));
+    JSC::JSObject *result = JSC::throwError(frame, jscError, text);
     return QScript::scriptEngineFromExec(frame)->scriptValueFromJSCValue(result);
 }
 
@@ -236,7 +236,7 @@ QScriptValue QScriptContext::throwError(Error error, const QString &text)
 QScriptValue QScriptContext::throwError(const QString &text)
 {
     JSC::CallFrame *frame = QScriptEnginePrivate::frameForContext(this);
-    JSC::JSObject *result = JSC::throwError(frame, JSC::GeneralError, QScript::qtStringToJSCUString(text));
+    JSC::JSObject *result = JSC::throwError(frame, JSC::GeneralError, text);
     return QScript::scriptEngineFromExec(frame)->scriptValueFromJSCValue(result);
 }
 
diff --git a/src/script/api/qscriptcontextinfo.cpp b/src/script/api/qscriptcontextinfo.cpp
index 294c48a..bd121a1 100644
--- a/src/script/api/qscriptcontextinfo.cpp
+++ b/src/script/api/qscriptcontextinfo.cpp
@@ -97,11 +97,6 @@ QT_BEGIN_NAMESPACE
     \value NativeFunction The function is a built-in Qt Script function, or it was defined through a call to QScriptEngine::newFunction().
 */
 
-namespace QScript
-{
-QString qtStringFromJSCUString(const JSC::UString &str);
-}
-
 class QScriptContextInfoPrivate
 {
     Q_DECLARE_PUBLIC(QScriptContextInfo)
@@ -187,13 +182,13 @@ QScriptContextInfoPrivate::QScriptContextInfoPrivate(const QScriptContext *conte
     if (codeBlock) {
            JSC::SourceProvider *source = codeBlock->source();
            scriptId = source->asID();
-           fileName = QScript::qtStringFromJSCUString(source->url());
+           fileName = source->url();
     }
 
     // Get the others informations:
     JSC::JSObject *callee = frame->callee();
     if (callee && callee->isObject(&JSC::InternalFunction::info))
-        functionName = QScript::qtStringFromJSCUString(JSC::asInternalFunction(callee)->name(&frame->globalData()));
+        functionName = JSC::asInternalFunction(callee)->name(&frame->globalData());
     if (callee && callee->isObject(&JSC::JSFunction::info)) {
         functionType = QScriptContextInfo::ScriptFunction;
         JSC::FunctionBodyNode *body = JSC::asFunction(callee)->body();
@@ -201,7 +196,7 @@ QScriptContextInfoPrivate::QScriptContextInfoPrivate(const QScriptContext *conte
         functionEndLineNumber = body->lastLine();
         const JSC::Identifier* params = body->parameters();
         for (size_t i = 0; i < body->parameterCount(); ++i)
-            parameterNames.append(QScript::qtStringFromJSCUString(params[i].ustring()));
+            parameterNames.append(params[i].ustring());
         // ### get the function name from the AST
     } else if (callee && callee->isObject(&QScript::QtFunction::info)) {
         functionType = QScriptContextInfo::QtFunction;
diff --git a/src/script/api/qscriptengine.cpp b/src/script/api/qscriptengine.cpp
index eef0b5d..63041db 100644
--- a/src/script/api/qscriptengine.cpp
+++ b/src/script/api/qscriptengine.cpp
@@ -452,16 +452,6 @@ qsreal integerFromString(const QString &str, int radix)
     return integerFromString(ba.constData(), ba.size(), radix);
 }
 
-JSC::UString qtStringToJSCUString(const QString &str)
-{
-    return JSC::UString(reinterpret_cast<const UChar*>(str.constData()), str.length());
-}
-
-QString qtStringFromJSCUString(const JSC::UString &str)
-{
-    return QString(reinterpret_cast<const QChar*>(str.data()), str.size());
-}
-
 QScriptEnginePrivate *scriptEngineFromExec(const JSC::ExecState *exec)
 {
     return static_cast<GlobalClientData*>(exec->globalData().clientData)->engine;
@@ -501,7 +491,7 @@ JSC::JSValue JSC_HOST_CALL functionDisconnect(JSC::ExecState *exec, JSC::JSObjec
         QString message = QString::fromLatin1("Function.prototype.disconnect: %0::%1 is not a signal")
                           .arg(QLatin1String(qtSignal->metaObject()->className()))
                           .arg(QLatin1String(sig.signature()));
-        return JSC::throwError(exec, JSC::TypeError, QScript::qtStringToJSCUString(message));
+        return JSC::throwError(exec, JSC::TypeError, message);
     }
 
     QScriptEnginePrivate *engine = scriptEngineFromExec(exec);
@@ -519,7 +509,7 @@ JSC::JSValue JSC_HOST_CALL functionDisconnect(JSC::ExecState *exec, JSC::JSObjec
         else {
             // ### don't go via QScriptValue
             QScriptValue tmp = engine->scriptValueFromJSCValue(arg0);
-            QString propertyName = QScript::qtStringFromJSCUString(arg1.toString(exec));
+            QString propertyName(arg1.toString(exec));
             slot = engine->scriptValueToJSCValue(tmp.property(propertyName, QScriptValue::ResolvePrototype));
         }
     }
@@ -533,7 +523,7 @@ JSC::JSValue JSC_HOST_CALL functionDisconnect(JSC::ExecState *exec, JSC::JSObjec
         QString message = QString::fromLatin1("Function.prototype.disconnect: failed to disconnect from %0::%1")
                           .arg(QLatin1String(qtSignal->metaObject()->className()))
                           .arg(QLatin1String(sig.signature()));
-        return JSC::throwError(exec, JSC::GeneralError, qtStringToJSCUString(message));
+        return JSC::throwError(exec, JSC::GeneralError, message);
     }
     return JSC::jsUndefined();
 #else
@@ -566,7 +556,7 @@ JSC::JSValue JSC_HOST_CALL functionConnect(JSC::ExecState *exec, JSC::JSObject *
         QString message = QString::fromLatin1("Function.prototype.connect: %0::%1 is not a signal")
                           .arg(QLatin1String(qtSignal->metaObject()->className()))
                           .arg(QLatin1String(sig.signature()));
-        return JSC::throwError(exec, JSC::TypeError, QScript::qtStringToJSCUString(message));
+        return JSC::throwError(exec, JSC::TypeError, message);
     }
 
     {
@@ -583,7 +573,7 @@ JSC::JSValue JSC_HOST_CALL functionConnect(JSC::ExecState *exec, JSC::JSObject *
             }
             message.append(QString::fromLatin1("Use e.g. object['%0'].connect() to connect to a particular overload")
                            .arg(QLatin1String(signature)));
-            return JSC::throwError(exec, JSC::GeneralError, qtStringToJSCUString(message));
+            return JSC::throwError(exec, JSC::GeneralError, message);
         }
     }
 
@@ -602,7 +592,7 @@ JSC::JSValue JSC_HOST_CALL functionConnect(JSC::ExecState *exec, JSC::JSObject *
         else {
             // ### don't go via QScriptValue
             QScriptValue tmp = engine->scriptValueFromJSCValue(arg0);
-            QString propertyName = QScript::qtStringFromJSCUString(arg1.toString(exec));
+            QString propertyName = arg1.toString(exec);
             slot = engine->scriptValueToJSCValue(tmp.property(propertyName, QScriptValue::ResolvePrototype));
         }
     }
@@ -616,7 +606,7 @@ JSC::JSValue JSC_HOST_CALL functionConnect(JSC::ExecState *exec, JSC::JSObject *
         QString message = QString::fromLatin1("Function.prototype.connect: failed to connect to %0::%1")
                           .arg(QLatin1String(qtSignal->metaObject()->className()))
                           .arg(QLatin1String(sig.signature()));
-        return JSC::throwError(exec, JSC::GeneralError, qtStringToJSCUString(message));
+        return JSC::throwError(exec, JSC::GeneralError, message);
     }
     return JSC::jsUndefined();
 #else
@@ -637,7 +627,7 @@ JSC::JSValue JSC_HOST_CALL functionPrint(JSC::ExecState* exec, JSC::JSObject*, J
     for (unsigned i = 0; i < args.size(); ++i) {
         if (i != 0)
             result.append(QLatin1Char(' '));
-        QString s = QScript::qtStringFromJSCUString(args.at(i).toString(exec));
+        QString s(args.at(i).toString(exec));
         if (exec->hadException())
             break;
         result.append(s);
@@ -680,22 +670,22 @@ JSC::JSValue JSC_HOST_CALL functionQsTranslate(JSC::ExecState *exec, JSC::JSObje
     if ((args.size() > 4) && !args.at(4).isNumber())
         return JSC::throwError(exec, JSC::GeneralError, "qsTranslate(): fifth argument (n) must be a number");
 #ifndef QT_NO_QOBJECT
-    QString context = qtStringFromJSCUString(args.at(0).toString(exec));
+    QString context(args.at(0).toString(exec));
 #endif
-    QString text = qtStringFromJSCUString(args.at(1).toString(exec));
+    QString text(args.at(1).toString(exec));
 #ifndef QT_NO_QOBJECT
     QString comment;
     if (args.size() > 2)
-        comment = qtStringFromJSCUString(args.at(2).toString(exec));
+        comment = args.at(2).toString(exec);
     QCoreApplication::Encoding encoding = QCoreApplication::CodecForTr;
     if (args.size() > 3) {
-        QString encStr = qtStringFromJSCUString(args.at(3).toString(exec));
+        QString encStr(args.at(3).toString(exec));
         if (encStr == QLatin1String("CodecForTr"))
             encoding = QCoreApplication::CodecForTr;
         else if (encStr == QLatin1String("UnicodeUTF8"))
             encoding = QCoreApplication::UnicodeUTF8;
         else
-            return JSC::throwError(exec, JSC::GeneralError, qtStringToJSCUString(QString::fromLatin1("qsTranslate(): invalid encoding '%s'").arg(encStr)));
+            return JSC::throwError(exec, JSC::GeneralError, QString::fromLatin1("qsTranslate(): invalid encoding '%s'").arg(encStr));
     }
     int n = -1;
     if (args.size() > 4)
@@ -710,7 +700,7 @@ JSC::JSValue JSC_HOST_CALL functionQsTranslate(JSC::ExecState *exec, JSC::JSObje
 #else
     result = text;
 #endif
-    return JSC::jsString(exec, qtStringToJSCUString(result));
+    return JSC::jsString(exec, result);
 }
 
 JSC::JSValue JSC_HOST_CALL functionQsTranslateNoOp(JSC::ExecState *, JSC::JSObject*, JSC::JSValue, const JSC::ArgList &args)
@@ -736,11 +726,11 @@ JSC::JSValue JSC_HOST_CALL functionQsTr(JSC::ExecState *exec, JSC::JSObject*, JS
 //    if (ctx->parentContext())
 //        context = QFileInfo(ctx->parentContext()->fileName()).baseName();
 #endif
-    QString text = qtStringFromJSCUString(args.at(0).toString(exec));
+    QString text(args.at(0).toString(exec));
 #ifndef QT_NO_QOBJECT
     QString comment;
     if (args.size() > 1)
-        comment = qtStringFromJSCUString(args.at(1).toString(exec));
+        comment = args.at(1).toString(exec);
     int n = -1;
     if (args.size() > 2)
         n = args.at(2).toInt32(exec);
@@ -754,7 +744,7 @@ JSC::JSValue JSC_HOST_CALL functionQsTr(JSC::ExecState *exec, JSC::JSObject*, JS
 #else
     result = text;
 #endif
-    return JSC::jsString(exec, qtStringToJSCUString(result));
+    return JSC::jsString(exec, result);
 }
 
 JSC::JSValue JSC_HOST_CALL functionQsTrNoOp(JSC::ExecState *, JSC::JSObject*, JSC::JSValue, const JSC::ArgList &args)
@@ -768,14 +758,14 @@ static JSC::JSValue JSC_HOST_CALL stringProtoFuncArg(JSC::ExecState*, JSC::JSObj
 
 JSC::JSValue JSC_HOST_CALL stringProtoFuncArg(JSC::ExecState *exec, JSC::JSObject*, JSC::JSValue thisObject, const JSC::ArgList &args)
 {
-    QString value = qtStringFromJSCUString(thisObject.toString(exec));
+    QString value(thisObject.toString(exec));
     JSC::JSValue arg = (args.size() != 0) ? args.at(0) : JSC::jsUndefined();
     QString result;
     if (arg.isString())
-        result = value.arg(qtStringFromJSCUString(arg.toString(exec)));
+        result = value.arg(arg.toString(exec));
     else if (arg.isNumber())
         result = value.arg(arg.toNumber(exec));
-    return JSC::jsString(exec, qtStringToJSCUString(result));
+    return JSC::jsString(exec, result);
 }
 
 
@@ -874,7 +864,7 @@ JSC::JSValue QScriptEnginePrivate::scriptValueToJSCValue(const QScriptValue &val
         if (vv->type == QScriptValuePrivate::Number) {
             vv->initFromJSCValue(JSC::jsNumber(currentFrame, vv->numberValue));
         } else { //QScriptValuePrivate::String
-            vv->initFromJSCValue(JSC::jsString(currentFrame, QScript::qtStringToJSCUString(vv->stringValue)));
+            vv->initFromJSCValue(JSC::jsString(currentFrame, vv->stringValue));
         }
     }
     return vv->jscValue;
@@ -933,7 +923,7 @@ JSC::JSValue QScriptEnginePrivate::jscValueFromVariant(const QVariant &v)
     case QScriptValuePrivate::Number:
         return JSC::jsNumber(currentFrame, p->numberValue);
     case QScriptValuePrivate::String: {
-        JSC::UString str = QScript::qtStringToJSCUString(p->stringValue);
+        JSC::UString str = p->stringValue;
         return JSC::jsString(currentFrame, str);
       }
     }
@@ -1599,11 +1589,11 @@ QScriptValue QScriptEngine::newRegExp(const QRegExp &regexp)
         pattern = ecmaPattern;
     }
 
-    JSC::UString jscPattern = QScript::qtStringToJSCUString(pattern);
+    JSC::UString jscPattern = pattern;
     QString flags;
     if (regexp.caseSensitivity() == Qt::CaseInsensitive)
         flags.append(QLatin1Char('i'));
-    JSC::UString jscFlags = QScript::qtStringToJSCUString(flags);
+    JSC::UString jscFlags = flags;
     buf[0] = JSC::jsString(exec, jscPattern);
     buf[1] = JSC::jsString(exec, jscFlags);
     JSC::JSObject* result = JSC::constructRegExp(exec, args);
@@ -1916,7 +1906,7 @@ QScriptValue QScriptEngine::newRegExp(const QString &pattern, const QString &fla
     JSC::ExecState* exec = d->currentFrame;
     JSC::JSValue buf[2];
     JSC::ArgList args(buf, sizeof(buf));
-    JSC::UString jscPattern = QScript::qtStringToJSCUString(pattern);
+    JSC::UString jscPattern = pattern;
     QString strippedFlags;
     if (flags.contains(QLatin1Char('i')))
         strippedFlags += QLatin1Char('i');
@@ -1924,7 +1914,7 @@ QScriptValue QScriptEngine::newRegExp(const QString &pattern, const QString &fla
         strippedFlags += QLatin1Char('m');
     if (flags.contains(QLatin1Char('g')))
         strippedFlags += QLatin1Char('g');
-    JSC::UString jscFlags = QScript::qtStringToJSCUString(strippedFlags);
+    JSC::UString jscFlags = strippedFlags;
     buf[0] = JSC::jsString(exec, jscPattern);
     buf[1] = JSC::jsString(exec, jscFlags);
     JSC::JSObject* result = JSC::constructRegExp(exec, args);
@@ -2153,8 +2143,8 @@ QScriptValue QScriptEngine::evaluate(const QString &program, const QString &file
     JSC::JSLock lock(false); // ### hmmm
     currentContext()->activationObject(); //force the creation of a context for native function;
 
-    JSC::UString jscProgram = QScript::qtStringToJSCUString(program);
-    JSC::UString jscFileName = QScript::qtStringToJSCUString(fileName);
+    JSC::UString jscProgram = program;
+    JSC::UString jscFileName = fileName;
     JSC::ExecState* exec = d->currentFrame;
     JSC::SourceCode source = JSC::makeSource(jscProgram, jscFileName, lineNumber);
 
@@ -3648,7 +3638,7 @@ QScriptString QScriptEngine::toStringHandle(const QString &str)
 {
     Q_D(QScriptEngine);
     QScriptString ss;
-    QScriptStringPrivate::init(ss, this, JSC::Identifier(d->currentFrame, QScript::qtStringToJSCUString(str)));
+    QScriptStringPrivate::init(ss, this, JSC::Identifier(d->currentFrame, str));
     return ss;
 }
 
diff --git a/src/script/api/qscriptengine_p.h b/src/script/api/qscriptengine_p.h
index 1f59d36..53972a2 100644
--- a/src/script/api/qscriptengine_p.h
+++ b/src/script/api/qscriptengine_p.h
@@ -97,8 +97,6 @@ namespace QScript
     class TimeoutCheckerProxy;
 
     //some conversion helper functions
-    JSC::UString qtStringToJSCUString(const QString &str);
-    QString qtStringFromJSCUString(const JSC::UString &str);
     QScriptEnginePrivate *scriptEngineFromExec(const JSC::ExecState *exec);
     bool isFunction(const JSC::JSValue &value);
 }
diff --git a/src/script/api/qscriptengineagent_p.h b/src/script/api/qscriptengineagent_p.h
index 20b4925..6f400c8 100644
--- a/src/script/api/qscriptengineagent_p.h
+++ b/src/script/api/qscriptengineagent_p.h
@@ -91,7 +91,7 @@ public:
     virtual void scriptLoad(qint64 id, const JSC::UString &program,
                          const JSC::UString &fileName, int baseLineNumber)
     {
-        q_ptr->scriptLoad(id,program.toQString(), fileName.toQString(), baseLineNumber);
+        q_ptr->scriptLoad(id,program, fileName, baseLineNumber);
     };
 
     //exceptions
diff --git a/src/script/api/qscriptstring.cpp b/src/script/api/qscriptstring.cpp
index 0ded562..c5fd83b 100644
--- a/src/script/api/qscriptstring.cpp
+++ b/src/script/api/qscriptstring.cpp
@@ -46,10 +46,6 @@
 
 QT_BEGIN_NAMESPACE
 
-namespace QScript
-{
-    QString qtStringFromJSCUString(const JSC::UString &str);
-}
 
 /*!
   \since 4.4
@@ -194,7 +190,7 @@ QString QScriptString::toString() const
     Q_D(const QScriptString);
     if (!d || !d->engine)
         return QString();
-    return QScript::qtStringFromJSCUString(d->identifier.ustring());
+    return d->identifier.ustring();
 }
 
 /*!
diff --git a/src/script/api/qscriptvalue.cpp b/src/script/api/qscriptvalue.cpp
index 3a8e544..6a8227a 100644
--- a/src/script/api/qscriptvalue.cpp
+++ b/src/script/api/qscriptvalue.cpp
@@ -353,8 +353,7 @@ QScriptValue QScriptValuePrivate::property(const QString &name, int resolveMode)
 {
     QScriptEnginePrivate *eng_p = QScriptEnginePrivate::get(engine);
     JSC::ExecState *exec = eng_p->currentFrame;
-    JSC::UString jscName = QScript::qtStringToJSCUString(name);
-    return property(JSC::Identifier(exec, jscName), resolveMode);
+    return property(JSC::Identifier(exec, name), resolveMode);
 }
 
 QScriptValue QScriptValuePrivate::property(const JSC::Identifier &id, int resolveMode) const
@@ -594,8 +593,7 @@ QScriptValue::QScriptValue(QScriptEngine *engine, const QString &val)
     if (engine) {
         QScriptEnginePrivate *eng_p = QScriptEnginePrivate::get(engine);
         JSC::ExecState *exec = eng_p->currentFrame;
-        JSC::UString jscVal = QScript::qtStringToJSCUString(val);
-        d_ptr->initFromJSCValue(JSC::jsString(exec, jscVal));
+        d_ptr->initFromJSCValue(JSC::jsString(exec, val));
     } else {
         d_ptr->initFromString(val);
     }
@@ -1276,10 +1274,10 @@ QString QScriptValue::toString() const
         }
         if (savedException)
             QScriptValuePrivate::restoreException(exec, savedException);
-        return QScript::qtStringFromJSCUString(str);
+        return str;
     }
     case QScriptValuePrivate::Number:
-        return QScript::qtStringFromJSCUString(JSC::UString::from(d->numberValue));
+        return JSC::UString::from(d->numberValue);
     case QScriptValuePrivate::String:
         return d->stringValue;
     }
@@ -1316,7 +1314,7 @@ qsreal QScriptValue::toNumber() const
     case QScriptValuePrivate::Number:
         return d->numberValue;
     case QScriptValuePrivate::String:
-        return QScript::qtStringToJSCUString(d->stringValue).toDouble();
+        return ((JSC::UString)d->stringValue).toDouble();
     }
     return 0;
 }
@@ -1416,7 +1414,7 @@ qint32 QScriptValue::toInt32() const
     case QScriptValuePrivate::Number:
         return QScript::ToInt32(d->numberValue);
     case QScriptValuePrivate::String:
-        return QScript::ToInt32(QScript::qtStringToJSCUString(d->stringValue).toDouble());
+        return QScript::ToInt32(((JSC::UString)d->stringValue).toDouble());
     }
     return 0;
 }
@@ -1451,7 +1449,7 @@ quint32 QScriptValue::toUInt32() const
     case QScriptValuePrivate::Number:
         return QScript::ToUint32(d->numberValue);
     case QScriptValuePrivate::String:
-        return QScript::ToUint32(QScript::qtStringToJSCUString(d->stringValue).toDouble());
+        return QScript::ToUint32(((JSC::UString)d->stringValue).toDouble());
     }
     return 0;
 }
@@ -1481,7 +1479,7 @@ quint16 QScriptValue::toUInt16() const
     case QScriptValuePrivate::Number:
         return QScript::ToUint16(d->numberValue);
     case QScriptValuePrivate::String:
-        return QScript::ToUint16(QScript::qtStringToJSCUString(d->stringValue).toDouble());
+        return QScript::ToUint16(((JSC::UString)d->stringValue).toDouble());
     }
     return 0;
 }
@@ -1516,7 +1514,7 @@ qsreal QScriptValue::toInteger() const
     case QScriptValuePrivate::Number:
         return QScript::ToInteger(d->numberValue);
     case QScriptValuePrivate::String:
-        return QScript::ToInteger(QScript::qtStringToJSCUString(d->stringValue).toDouble());
+        return QScript::ToInteger(((JSC::UString)d->stringValue).toDouble());
     }
     return 0;
 }
diff --git a/src/script/api/qscriptvalueiterator.cpp b/src/script/api/qscriptvalueiterator.cpp
index 984dea1..607570d 100644
--- a/src/script/api/qscriptvalueiterator.cpp
+++ b/src/script/api/qscriptvalueiterator.cpp
@@ -265,7 +265,7 @@ QString QScriptValueIterator::name() const
     Q_D(const QScriptValueIterator);
     if (!d || !d->initialized)
         return QString();
-    return QScript::qtStringFromJSCUString(*d->current);
+    return *d->current;
 }
 
 /*!
diff --git a/src/script/bridge/qscriptclassobject.cpp b/src/script/bridge/qscriptclassobject.cpp
index 504742a..bf886b0 100644
--- a/src/script/bridge/qscriptclassobject.cpp
+++ b/src/script/bridge/qscriptclassobject.cpp
@@ -97,7 +97,7 @@ bool ClassObjectDelegate::getOwnPropertySlot(QScriptObject* object,
 
     QScriptEnginePrivate *engine = scriptEngineFromExec(exec);
     QScriptValue scriptObject = engine->scriptValueFromJSCValue(object);
-    QString name = qtStringFromJSCUString(propertyName.ustring());
+    QString name(propertyName.ustring());
     QScriptString scriptName = QScriptEnginePrivate::get(engine)->toStringHandle(name);
     uint id = 0;
     QScriptClass::QueryFlags flags = m_scriptClass->queryProperty(
@@ -116,7 +116,7 @@ void ClassObjectDelegate::put(QScriptObject* object, JSC::ExecState *exec,
 {
     QScriptEnginePrivate *engine = scriptEngineFromExec(exec);
     QScriptValue scriptObject = engine->scriptValueFromJSCValue(object);
-    QString name = qtStringFromJSCUString(propertyName.ustring());
+    QString name(propertyName.ustring());
     QScriptString scriptName = QScriptEnginePrivate::get(engine)->toStringHandle(name);
     uint id = 0;
     QScriptClass::QueryFlags flags = m_scriptClass->queryProperty(
@@ -135,7 +135,7 @@ bool ClassObjectDelegate::deleteProperty(QScriptObject* object, JSC::ExecState *
     // ### avoid duplication of put()
     QScriptEnginePrivate *engine = scriptEngineFromExec(exec);
     QScriptValue scriptObject = engine->scriptValueFromJSCValue(object);
-    QString name = qtStringFromJSCUString(propertyName.ustring());
+    QString name(propertyName.ustring());
     QScriptString scriptName = QScriptEnginePrivate::get(engine)->toStringHandle(name);
     uint id = 0;
     QScriptClass::QueryFlags flags = m_scriptClass->queryProperty(
@@ -155,7 +155,7 @@ bool ClassObjectDelegate::getPropertyAttributes(const QScriptObject* object, JSC
 {
     QScriptEnginePrivate *engine = scriptEngineFromExec(exec);
     QScriptValue scriptObject = engine->scriptValueFromJSCValue(object);
-    QString name = qtStringFromJSCUString(propertyName.ustring());
+    QString name(propertyName.ustring());
     QScriptString scriptName = QScriptEnginePrivate::get(engine)->toStringHandle(name);
     uint id = 0;
     QScriptClass::QueryFlags flags = m_scriptClass->queryProperty(
@@ -190,7 +190,7 @@ void ClassObjectDelegate::getPropertyNames(QScriptObject* object, JSC::ExecState
         while (it->hasNext()) {
             it->next();
             QString name = it->name().toString();
-            propertyNames.add(JSC::Identifier(exec, qtStringToJSCUString(name)));
+            propertyNames.add(JSC::Identifier(exec, name));
         }
         delete it;
     }
diff --git a/src/script/bridge/qscriptqobject.cpp b/src/script/bridge/qscriptqobject.cpp
index ffb5d1a..e98ec8a 100644
--- a/src/script/bridge/qscriptqobject.cpp
+++ b/src/script/bridge/qscriptqobject.cpp
@@ -867,7 +867,7 @@ static JSC::JSValue callQtMethod(JSC::ExecState *exec, QMetaMethod::MethodType c
                 QMetaMethod mtd = metaMethod(meta, callType, conversionFailed.at(i));
                 message += QString::fromLatin1("    %0").arg(QString::fromLatin1(mtd.signature()));
             }
-            result = JSC::throwError(exec, JSC::TypeError, qtStringToJSCUString(message));
+            result = JSC::throwError(exec, JSC::TypeError, message);
         } else if (!unresolved.isEmpty()) {
             QScriptMetaArguments argsInstance = unresolved.first();
             int unresolvedIndex = argsInstance.method.firstUnresolvedIndex();
@@ -884,7 +884,7 @@ static JSC::JSValue callQtMethod(JSC::ExecState *exec, QMetaMethod::MethodType c
                                .arg(unresolvedTypeName));
             }
             message.append(QString::fromLatin1(" (register the type with qScriptRegisterMetaType())"));
-            result = JSC::throwError(exec, JSC::TypeError, qtStringToJSCUString(message));
+            result = JSC::throwError(exec, JSC::TypeError, message);
         } else {
             QString message = QString::fromLatin1("too few arguments in call to %0(); candidates are\n")
                               .arg(QLatin1String(funName));
@@ -894,7 +894,7 @@ static JSC::JSValue callQtMethod(JSC::ExecState *exec, QMetaMethod::MethodType c
                 QMetaMethod mtd = metaMethod(meta, callType, tooFewArgs.at(i));
                 message += QString::fromLatin1("    %0").arg(QString::fromLatin1(mtd.signature()));
             }
-            result = JSC::throwError(exec, JSC::SyntaxError, qtStringToJSCUString(message));
+            result = JSC::throwError(exec, JSC::SyntaxError, message);
         }
     } else {
         if (chosenIndex == -1) {
@@ -911,7 +911,7 @@ static JSC::JSValue callQtMethod(JSC::ExecState *exec, QMetaMethod::MethodType c
                     QMetaMethod mtd = metaMethod(meta, callType, candidates.at(i).index);
                     message += QString::fromLatin1("    %0").arg(QString::fromLatin1(mtd.signature()));
                 }
-                result = JSC::throwError(exec, JSC::TypeError, qtStringToJSCUString(message));
+                result = JSC::throwError(exec, JSC::TypeError, message);
             } else {
                 chosenMethod = metaArgs.method;
                 chosenIndex = metaArgs.index;
@@ -1120,7 +1120,7 @@ JSC::JSValue QtPropertyFunction::execute(JSC::ExecState *exec,
             && !engine->hasDemarshalFunction(prop.userType())) {
             // give QMetaProperty::write() a chance to convert from
             // string to enum value
-            v = qtStringFromJSCUString(arg.toString(exec));
+            v = (QString)arg.toString(exec);
         } else {
             // ### don't go via QScriptValue
             QScriptValue tmp = engine->scriptValueFromJSCValue(arg);
@@ -1190,12 +1190,12 @@ bool QObjectDelegate::getOwnPropertySlot(QScriptObject *object, JSC::ExecState *
                                          const JSC::Identifier &propertyName,
                                          JSC::PropertySlot &slot)
 {
-    QByteArray name = qtStringFromJSCUString(propertyName.ustring()).toLatin1();
+    QByteArray name = QString(propertyName.ustring()).toLatin1();
     QObject *qobject = data->value;
     if (!qobject) {
         QString message = QString::fromLatin1("cannot access member `%0' of deleted QObject")
                           .arg(QString::fromLatin1(name));
-        slot.setValue(JSC::throwError(exec, JSC::GeneralError, qtStringToJSCUString(message)));
+        slot.setValue(JSC::throwError(exec, JSC::GeneralError, message));
         return true;
     }
 
@@ -1286,7 +1286,7 @@ bool QObjectDelegate::getOwnPropertySlot(QScriptObject *object, JSC::ExecState *
         QList<QObject*> children = qobject->children();
         for (index = 0; index < children.count(); ++index) {
             QObject *child = children.at(index);
-            if (child->objectName() == qtStringFromJSCUString(propertyName.ustring())) {
+            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));
@@ -1302,12 +1302,12 @@ void QObjectDelegate::put(QScriptObject *object, JSC::ExecState* exec,
                           const JSC::Identifier& propertyName,
                           JSC::JSValue value, JSC::PutPropertySlot &slot)
 {
-    QByteArray name = qtStringFromJSCUString(propertyName.ustring()).toLatin1();
+    QByteArray name = ((QString)propertyName.ustring()).toLatin1();
     QObject *qobject = data->value;
     if (!qobject) {
         QString message = QString::fromLatin1("cannot access member `%0' of deleted QObject")
                           .arg(QString::fromLatin1(name));
-        JSC::throwError(exec, JSC::GeneralError, qtStringToJSCUString(message));
+        JSC::throwError(exec, JSC::GeneralError, message);
         return;
     }
 
@@ -1362,7 +1362,7 @@ void QObjectDelegate::put(QScriptObject *object, JSC::ExecState* exec,
                         && !eng->hasDemarshalFunction(prop.userType())) {
                         // give QMetaProperty::write() a chance to convert from
                         // string to enum value
-                        v = qtStringFromJSCUString(value.toString(exec));
+                        v = (QString)value.toString(exec);
                     } else {
                         v = eng->jscValueToVariant(value, prop.userType());
                     }
@@ -1398,12 +1398,12 @@ bool QObjectDelegate::deleteProperty(QScriptObject *object, JSC::ExecState *exec
                                      const JSC::Identifier& propertyName,
                                      bool checkDontDelete)
 {
-    QByteArray name = qtStringFromJSCUString(propertyName.ustring()).toLatin1();
+    QByteArray name = ((QString)propertyName.ustring()).toLatin1();
     QObject *qobject = data->value;
     if (!qobject) {
         QString message = QString::fromLatin1("cannot access member `%0' of deleted QObject")
                           .arg(QString::fromLatin1(name));
-        JSC::throwError(exec, JSC::GeneralError, qtStringToJSCUString(message));
+        JSC::throwError(exec, JSC::GeneralError, message);
         return false;
     }
 
@@ -1444,7 +1444,7 @@ bool QObjectDelegate::getPropertyAttributes(const QScriptObject *object,
                                             unsigned &attributes) const
 {
     // ### try to avoid duplicating logic from getOwnPropertySlot()
-    QByteArray name = qtStringFromJSCUString(propertyName.ustring()).toLatin1();
+    QByteArray name = ((QString)propertyName.ustring()).toLatin1();
     QObject *qobject = data->value;
     if (!qobject)
         return false;
@@ -1503,7 +1503,7 @@ bool QObjectDelegate::getPropertyAttributes(const QScriptObject *object,
         QList<QObject*> children = qobject->children();
         for (index = 0; index < children.count(); ++index) {
             QObject *child = children.at(index);
-            if (child->objectName() == qtStringFromJSCUString(propertyName.ustring())) {
+            if (child->objectName() == (QString)(propertyName.ustring())) {
                 attributes = JSC::ReadOnly | JSC::DontDelete | JSC::DontEnum;
                 return true;
             }
@@ -1520,7 +1520,7 @@ void QObjectDelegate::getPropertyNames(QScriptObject *object, JSC::ExecState *ex
     QObject *qobject = data->value;
     if (!qobject) {
         QString message = QString::fromLatin1("cannot get property names of deleted QObject");
-        JSC::throwError(exec, JSC::GeneralError, qtStringToJSCUString(message));
+        JSC::throwError(exec, JSC::GeneralError, message);
         return;
     }
 
@@ -1533,7 +1533,7 @@ void QObjectDelegate::getPropertyNames(QScriptObject *object, JSC::ExecState *ex
             QMetaProperty prop = meta->property(i);
             if (isEnumerableMetaProperty(prop, meta, i)) {
                 QString name = QString::fromLatin1(prop.name());
-                propertyNames.add(JSC::Identifier(exec, qtStringToJSCUString(name)));
+                propertyNames.add(JSC::Identifier(exec, name));
             }
         }
     }
@@ -1542,7 +1542,7 @@ void QObjectDelegate::getPropertyNames(QScriptObject *object, JSC::ExecState *ex
         QList<QByteArray> dpNames = qobject->dynamicPropertyNames();
         for (int i = 0; i < dpNames.size(); ++i) {
             QString name = QString::fromLatin1(dpNames.at(i));
-            propertyNames.add(JSC::Identifier(exec, qtStringToJSCUString(name)));
+            propertyNames.add(JSC::Identifier(exec, name));
         }
     }
 
@@ -1554,7 +1554,7 @@ void QObjectDelegate::getPropertyNames(QScriptObject *object, JSC::ExecState *ex
             if (hasMethodAccess(method, i, opt)) {
                 QMetaMethod method = meta->method(i);
                 QString sig = QString::fromLatin1(method.signature());
-                propertyNames.add(JSC::Identifier(exec, qtStringToJSCUString(sig)));
+                propertyNames.add(JSC::Identifier(exec, sig));
             }
         }
     }
@@ -1588,7 +1588,7 @@ static JSC::JSValue JSC_HOST_CALL qobjectProtoFuncFindChild(JSC::ExecState *exec
     QObject *obj = static_cast<QObjectDelegate*>(delegate)->value();
     QString name;
     if (args.size() != 0)
-        name = QScript::qtStringFromJSCUString(args.at(0).toString(exec));
+        name = args.at(0).toString(exec);
     QObject *child = qFindChild<QObject*>(obj, name);
     QScriptEngine::QObjectWrapOptions opt = QScriptEngine::PreferExistingWrapperObject;
     return engine->newQObject(child, QScriptEngine::QtOwnership, opt);
@@ -1620,7 +1620,7 @@ static JSC::JSValue JSC_HOST_CALL qobjectProtoFuncFindChildren(JSC::ExecState *e
             const int allChildrenCount = allChildren.size();
             for (int i = 0; i < allChildrenCount; ++i) {
                 QObject *const child = allChildren.at(i);
-                const JSC::UString childName = qtStringToJSCUString(child->objectName());
+                const JSC::UString childName = child->objectName();
                 JSC::RegExpConstructor* regExpConstructor = engine->originalGlobalObject()->regExpConstructor();
                 int position;
                 int length;
@@ -1629,7 +1629,7 @@ static JSC::JSValue JSC_HOST_CALL qobjectProtoFuncFindChildren(JSC::ExecState *e
                     children.append(child);
             }
         } else {
-            const QString name = QScript::qtStringFromJSCUString(args.at(0).toString(exec));
+            const QString name(args.at(0).toString(exec));
             children = qFindChildren<QObject*>(obj, name);
         }
     } else {
@@ -1663,7 +1663,7 @@ static JSC::JSValue JSC_HOST_CALL qobjectProtoFuncToString(JSC::ExecState *exec,
     QString name = obj ? obj->objectName() : QString::fromUtf8("unnamed");
     QString str = QString::fromUtf8("%0(name = \"%1\")")
                   .arg(QLatin1String(meta->className())).arg(name);
-    return JSC::jsString(exec, qtStringToJSCUString(str));
+    return JSC::jsString(exec, str);
 }
 
 QObjectPrototype::QObjectPrototype(JSC::ExecState* exec, WTF::PassRefPtr<JSC::Structure> structure,
@@ -1713,7 +1713,7 @@ bool QMetaObjectWrapperObject::getOwnPropertySlot(
         return true;
     }
 
-    QByteArray name = qtStringFromJSCUString(propertyName.ustring()).toLatin1();
+    QByteArray name = QString(propertyName.ustring()).toLatin1();
 
     for (int i = 0; i < meta->enumeratorCount(); ++i) {
         QMetaEnum e = meta->enumerator(i);
@@ -1741,7 +1741,7 @@ void QMetaObjectWrapperObject::put(JSC::ExecState* exec, const JSC::Identifier&
     }
     const QMetaObject *meta = data->value;
     if (meta) {
-        QByteArray name = qtStringFromJSCUString(propertyName.ustring()).toLatin1();
+        QByteArray name = QString(propertyName.ustring()).toLatin1();
         for (int i = 0; i < meta->enumeratorCount(); ++i) {
             QMetaEnum e = meta->enumerator(i);
             for (int j = 0; j < e.keyCount(); ++j) {
@@ -1761,7 +1761,7 @@ bool QMetaObjectWrapperObject::deleteProperty(
         return false;
     const QMetaObject *meta = data->value;
     if (meta) {
-        QByteArray name = qtStringFromJSCUString(propertyName.ustring()).toLatin1();
+        QByteArray name = QString(propertyName.ustring()).toLatin1();
         for (int i = 0; i < meta->enumeratorCount(); ++i) {
             QMetaEnum e = meta->enumerator(i);
             for (int j = 0; j < e.keyCount(); ++j) {
@@ -1783,7 +1783,7 @@ bool QMetaObjectWrapperObject::getPropertyAttributes(JSC::ExecState *exec,
     }
     const QMetaObject *meta = data->value;
     if (meta) {
-        QByteArray name = qtStringFromJSCUString(propertyName.ustring()).toLatin1();
+        QByteArray name = QString(propertyName.ustring()).toLatin1();
         for (int i = 0; i < meta->enumeratorCount(); ++i) {
             QMetaEnum e = meta->enumerator(i);
             for (int j = 0; j < e.keyCount(); ++j) {
@@ -1900,7 +1900,7 @@ JSC::JSValue QMetaObjectWrapperObject::execute(JSC::ExecState *exec,
         } else {
             QString message = QString::fromLatin1("no constructor for %0")
                               .arg(QLatin1String(meta->className()));
-            return JSC::throwError(exec, JSC::TypeError, qtStringToJSCUString(message));
+            return JSC::throwError(exec, JSC::TypeError, message);
         }
     }
 }
diff --git a/src/script/bridge/qscriptvariant.cpp b/src/script/bridge/qscriptvariant.cpp
index d352a98..ee59e4f 100644
--- a/src/script/bridge/qscriptvariant.cpp
+++ b/src/script/bridge/qscriptvariant.cpp
@@ -98,7 +98,7 @@ static JSC::JSValue JSC_HOST_CALL variantProtoFuncValueOf(JSC::ExecState *exec,
     case QVariant::Invalid:
         return JSC::jsUndefined();
     case QVariant::String:
-        return JSC::jsString(exec, QScript::qtStringToJSCUString(v.toString()));
+        return JSC::jsString(exec, v.toString());
 
     case QVariant::Int:
         return JSC::jsNumber(exec, v.toInt());
@@ -135,7 +135,7 @@ static JSC::JSValue JSC_HOST_CALL variantProtoFuncToString(JSC::ExecState *exec,
     JSC::UString result;
     JSC::JSValue value = variantProtoFuncValueOf(exec, callee, thisValue, args);
     if (value.isObject()) {
-        result = QScript::qtStringToJSCUString(v.toString());
+        result = v.toString();
         if (result.isEmpty()) {
             result = "QVariant(";
             result += v.typeName();