Clean up Value::isString()/stringValue() combinations

It's enough to just call stringValue(), as that already
does the isString() check.

Change-Id: I7be0e643a7975c0704b4c9c43b337deb8db9fce0
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

12 files changed, 136 insertions, 118 deletions

diff --git a/src/qml/jsapi/qjsvalue.cpp b/src/qml/jsapi/qjsvalue.cpp
index d0a903a52d..b473e96286 100644
--- a/src/qml/jsapi/qjsvalue.cpp
+++ b/src/qml/jsapi/qjsvalue.cpp
@@ -612,8 +612,8 @@ QVariant QJSValue::toVariant() const
     if (Object *o = val->as<Object>())
         return o->engine()->toVariant(*val, /*typeHint*/ -1, /*createJSValueForObjects*/ false);
 
-    if (val->isString())
-        return QVariant(val->stringValue()->toQString());
+    if (String *s = val->stringValue())
+        return QVariant(s->toQString());
     if (val->isBoolean())
         return QVariant(val->booleanValue());
     if (val->isNumber()) {
@@ -885,15 +885,13 @@ QJSValue& QJSValue::operator=(const QJSValue& other)
 
 static bool js_equal(const QString &string, const QV4::Value &value)
 {
-    String *s = value.stringValue();
-    if (s)
+    if (String *s = value.stringValue())
         return string == s->toQString();
     if (value.isNumber())
         return RuntimeHelpers::stringToNumber(string) == value.asDouble();
     if (value.isBoolean())
         return RuntimeHelpers::stringToNumber(string) == double(value.booleanValue());
-    Object *o = value.objectValue();
-    if (o) {
+    if (Object *o = value.objectValue()) {
         Scope scope(o->engine());
         ScopedValue p(scope, RuntimeHelpers::toPrimitive(value, PREFERREDTYPE_HINT));
         return js_equal(string, p);
@@ -981,8 +979,8 @@ bool QJSValue::strictlyEquals(const QJSValue& other) const
             return *variant == *QJSValuePrivate::getVariant(&other);
         if (variant->type() == QVariant::Map || variant->type() == QVariant::List)
             return false;
-        if (ov->isString())
-            return variant->toString() == ov->stringValue()->toQString();
+        if (String *s = ov->stringValue())
+            return variant->toString() == s->toQString();
         return false;
     }
     if (!ov)
diff --git a/src/qml/jsruntime/qv4dateobject.cpp b/src/qml/jsruntime/qv4dateobject.cpp
index 5af26f8f36..8cc6a25fea 100644
--- a/src/qml/jsruntime/qv4dateobject.cpp
+++ b/src/qml/jsruntime/qv4dateobject.cpp
@@ -689,8 +689,8 @@ void DateCtor::construct(const Managed *, Scope &scope, CallData *callData)
         } else {
             arg = RuntimeHelpers::toPrimitive(arg, PREFERREDTYPE_HINT);
 
-            if (arg->isString())
-                t = ParseString(arg->stringValue()->toQString());
+            if (String *s = arg->stringValue())
+                t = ParseString(s->toQString());
             else
                 t = TimeClip(arg->toNumber());
         }
diff --git a/src/qml/jsruntime/qv4engine.cpp b/src/qml/jsruntime/qv4engine.cpp
index a9284f2e69..634b8a3e6b 100644
--- a/src/qml/jsruntime/qv4engine.cpp
+++ b/src/qml/jsruntime/qv4engine.cpp
@@ -1151,8 +1151,8 @@ static QVariant toVariant(QV4::ExecutionEngine *e, const QV4::Value &value, int
         return value.integerValue();
     if (value.isNumber())
         return value.asDouble();
-    if (value.isString()) {
-        const QString &str = value.toQString();
+    if (String *s = value.stringValue()) {
+        const QString &str = s->toQString();
         // QChars are stored as a strings
         if (typeHint == QVariant::Char && str.size() == 1)
             return str.at(0);
@@ -1591,8 +1591,8 @@ bool ExecutionEngine::metaTypeFromJS(const Value *value, int type, void *data)
         *reinterpret_cast<unsigned char*>(data) = (unsigned char)(value->toInt32());
         return true;
     case QMetaType::QChar:
-        if (value->isString()) {
-            QString str = value->stringValue()->toQString();
+        if (String *s = value->stringValue()) {
+            QString str = s->toQString();
             *reinterpret_cast<QChar*>(data) = str.isEmpty() ? QChar() : str.at(0);
         } else {
             *reinterpret_cast<QChar*>(data) = QChar(ushort(value->toUInt16()));
diff --git a/src/qml/jsruntime/qv4globalobject.cpp b/src/qml/jsruntime/qv4globalobject.cpp
index feb0d90d26..af92ce1ad8 100644
--- a/src/qml/jsruntime/qv4globalobject.cpp
+++ b/src/qml/jsruntime/qv4globalobject.cpp
@@ -357,12 +357,13 @@ void EvalFunction::evalCall(Scope &scope, CallData *callData, bool directCall) c
         ctx = v4->pushGlobalContext();
     }
 
-    if (!callData->args[0].isString()) {
+    String *scode = callData->args[0].stringValue();
+    if (!scode) {
         scope.result = callData->args[0].asReturnedValue();
         return;
     }
 
-    const QString code = callData->args[0].stringValue()->toQString();
+    const QString code = scode->toQString();
     bool inheritContext = !ctx->d()->strictMode;
 
     Script script(ctx, code, QStringLiteral("eval code"));
diff --git a/src/qml/jsruntime/qv4jsonobject.cpp b/src/qml/jsruntime/qv4jsonobject.cpp
index 6a01f207c4..d79e6242ba 100644
--- a/src/qml/jsruntime/qv4jsonobject.cpp
+++ b/src/qml/jsruntime/qv4jsonobject.cpp
@@ -727,8 +727,8 @@ QString Stringify::Str(const QString &key, const Value &v)
         return QStringLiteral("null");
     if (scope.result.isBoolean())
         return scope.result.booleanValue() ? QStringLiteral("true") : QStringLiteral("false");
-    if (scope.result.isString())
-        return quote(scope.result.stringValue()->toQString());
+    if (String *s = scope.result.stringValue())
+        return quote(s->toQString());
 
     if (scope.result.isNumber()) {
         double d = scope.result.toNumber();
@@ -940,8 +940,8 @@ ReturnedValue JsonObject::method_stringify(CallContext *ctx)
 
     if (s->isNumber()) {
         stringify.gap = QString(qMin(10, (int)s->toInteger()), ' ');
-    } else if (s->isString()) {
-        stringify.gap = s->stringValue()->toQString().left(10);
+    } else if (String *str = s->stringValue()) {
+        stringify.gap = str->toQString().left(10);
     }
 
 
@@ -982,8 +982,8 @@ QJsonValue JsonObject::toJsonValue(const Value &value, V4ObjectSet &visitedObjec
         return QJsonValue(QJsonValue::Null);
     else if (value.isUndefined())
         return QJsonValue(QJsonValue::Undefined);
-    else if (value.isString())
-        return QJsonValue(value.toQString());
+    else if (String *s = value.stringValue())
+        return QJsonValue(s->toQString());
 
     Q_ASSERT(value.isObject());
     Scope scope(value.as<Object>()->engine());
diff --git a/src/qml/jsruntime/qv4regexpobject.cpp b/src/qml/jsruntime/qv4regexpobject.cpp
index c35286bd3a..218695624b 100644
--- a/src/qml/jsruntime/qv4regexpobject.cpp
+++ b/src/qml/jsruntime/qv4regexpobject.cpp
@@ -262,12 +262,12 @@ void RegExpCtor::construct(const Managed *, Scope &scope, CallData *callData)
     bool ignoreCase = false;
     bool multiLine = false;
     if (!f->isUndefined()) {
-        f = f->toString(scope.engine);
+        ScopedString s(scope, f->toString(scope.engine));
         if (scope.hasException()) {
             scope.result = Encode::undefined();
             return;
         }
-        QString str = f->stringValue()->toQString();
+        QString str = s->toQString();
         for (int i = 0; i < str.length(); ++i) {
             if (str.at(i) == QLatin1Char('g') && !global) {
                 global = true;
@@ -356,10 +356,10 @@ ReturnedValue RegExpPrototype::method_exec(CallContext *ctx)
         return ctx->engine()->throwTypeError();
 
     ScopedValue arg(scope, ctx->argument(0));
-    arg = arg->toString(scope.engine);
+    ScopedString str(scope, arg->toString(scope.engine));
     if (scope.hasException())
         return Encode::undefined();
-    QString s = arg->stringValue()->toQString();
+    QString s = str->toQString();
 
     int offset = r->global() ? r->lastIndexProperty()->toInt32() : 0;
     if (offset < 0 || offset > s.length()) {
@@ -391,11 +391,11 @@ ReturnedValue RegExpPrototype::method_exec(CallContext *ctx)
     }
     array->setArrayLengthUnchecked(len);
     *array->propertyData(Index_ArrayIndex) = Primitive::fromInt32(result);
-    *array->propertyData(Index_ArrayInput) = arg;
+    *array->propertyData(Index_ArrayInput) = str;
 
     RegExpCtor::Data *dd = regExpCtor->d();
     dd->lastMatch = array;
-    dd->lastInput = arg->stringValue()->d();
+    dd->lastInput = str->d();
     dd->lastMatchStart = matchOffsets[0];
     dd->lastMatchEnd = matchOffsets[1];
 
diff --git a/src/qml/jsruntime/qv4runtime.cpp b/src/qml/jsruntime/qv4runtime.cpp
index 11ab4c85a0..6d26cd8ad9 100644
--- a/src/qml/jsruntime/qv4runtime.cpp
+++ b/src/qml/jsruntime/qv4runtime.cpp
@@ -492,8 +492,8 @@ Heap::String *RuntimeHelpers::convertToString(ExecutionEngine *engine, const Val
         else
             return engine->id_false()->d();
     case Value::Managed_Type:
-        if (value.isString())
-            return value.stringValue()->d();
+        if (String *s = value.stringValue())
+            return s->d();
         {
             Scope scope(engine);
             ScopedValue prim(scope, RuntimeHelpers::toPrimitive(value, STRING_HINT));
@@ -523,8 +523,8 @@ static Heap::String *convert_to_string_add(ExecutionEngine *engine, const Value
         else
             return engine->id_false()->d();
     case Value::Managed_Type:
-        if (value.isString())
-            return value.stringValue()->d();
+        if (String *s = value.stringValue())
+            return s->d();
         {
             Scope scope(engine);
             ScopedValue prim(scope, RuntimeHelpers::toPrimitive(value, PREFERREDTYPE_HINT));
@@ -543,19 +543,25 @@ QV4::ReturnedValue RuntimeHelpers::addHelper(ExecutionEngine *engine, const Valu
 
     ScopedValue pleft(scope, RuntimeHelpers::toPrimitive(left, PREFERREDTYPE_HINT));
     ScopedValue pright(scope, RuntimeHelpers::toPrimitive(right, PREFERREDTYPE_HINT));
-    if (pleft->isString() || pright->isString()) {
-        if (!pleft->isString())
+    String *sleft = pleft->stringValue();
+    String *sright = pright->stringValue();
+    if (sleft || sright) {
+        if (!sleft) {
             pleft = convert_to_string_add(engine, pleft);
-        if (!pright->isString())
+            sleft = static_cast<String *>(pleft.ptr);
+        }
+        if (!sright) {
             pright = convert_to_string_add(engine, pright);
+            sright = static_cast<String *>(pright.ptr);
+        }
         if (scope.engine->hasException)
             return Encode::undefined();
-        if (!pleft->stringValue()->d()->length())
-            return pright->asReturnedValue();
-        if (!pright->stringValue()->d()->length())
-            return pleft->asReturnedValue();
+        if (!sleft->d()->length())
+            return sright->asReturnedValue();
+        if (!sright->d()->length())
+            return sleft->asReturnedValue();
         MemoryManager *mm = engine->memoryManager;
-        return (mm->alloc<String>(mm, pleft->stringValue()->d(), pright->stringValue()->d()))->asReturnedValue();
+        return (mm->alloc<String>(mm, sleft->d(), sright->d()))->asReturnedValue();
     }
     double x = RuntimeHelpers::toNumber(pleft);
     double y = RuntimeHelpers::toNumber(pright);
@@ -566,31 +572,28 @@ QV4::ReturnedValue Runtime::method_addString(ExecutionEngine *engine, const Valu
 {
     Q_ASSERT(left.isString() || right.isString());
 
-    if (left.isString() && right.isString()) {
-        if (!left.stringValue()->d()->length())
-            return right.asReturnedValue();
-        if (!right.stringValue()->d()->length())
-            return left.asReturnedValue();
-        MemoryManager *mm = engine->memoryManager;
-        return (mm->alloc<String>(mm, left.stringValue()->d(), right.stringValue()->d()))->asReturnedValue();
-    }
-
     Scope scope(engine);
     ScopedValue pleft(scope, left);
     ScopedValue pright(scope, right);
+    String *sleft = pleft->stringValue();
+    String *sright = pright->stringValue();
 
-    if (!pleft->isString())
-        pleft = convert_to_string_add(engine, left);
-    if (!pright->isString())
-        pright = convert_to_string_add(engine, right);
+    if (!sleft) {
+        pleft = convert_to_string_add(engine, pleft);
+        sleft = static_cast<String *>(pleft.ptr);
+    }
+    if (!sright) {
+        pright = convert_to_string_add(engine, pright);
+        sright = static_cast<String *>(pright.ptr);
+    }
     if (scope.engine->hasException)
         return Encode::undefined();
-    if (!pleft->stringValue()->d()->length())
+    if (!sleft->d()->length())
         return pright->asReturnedValue();
-    if (!pright->stringValue()->d()->length())
+    if (!sright->d()->length())
         return pleft->asReturnedValue();
     MemoryManager *mm = engine->memoryManager;
-    return (mm->alloc<String>(mm, pleft->stringValue()->d(), pright->stringValue()->d()))->asReturnedValue();
+    return (mm->alloc<String>(mm, sleft->d(), sright->d()))->asReturnedValue();
 }
 
 void Runtime::method_setProperty(ExecutionEngine *engine, const Value &object, int nameIndex, const Value &value)
@@ -787,12 +790,14 @@ QV4::Bool Runtime::method_compareGreaterThan(const Value &l, const Value &r)
         return l.integerValue() > r.integerValue();
     if (l.isNumber() && r.isNumber())
         return l.asDouble() > r.asDouble();
-    if (l.isString() && r.isString()) {
+    String *sl = l.stringValue();
+    String *sr = r.stringValue();
+    if (sl && sr) {
 #ifdef V4_BOOTSTRAP
         Q_UNIMPLEMENTED();
         return false;
 #else
-        return r.stringValue()->compare(l.stringValue());
+        return sr->compare(sl);
 #endif
     }
 
@@ -820,12 +825,14 @@ QV4::Bool Runtime::method_compareLessThan(const Value &l, const Value &r)
         return l.integerValue() < r.integerValue();
     if (l.isNumber() && r.isNumber())
         return l.asDouble() < r.asDouble();
-    if (l.isString() && r.isString()) {
+    String *sl = l.stringValue();
+    String *sr = r.stringValue();
+    if (sl && sr) {
 #ifdef V4_BOOTSTRAP
         Q_UNIMPLEMENTED();
         return false;
 #else
-        return l.stringValue()->compare(r.stringValue());
+        return sl->compare(sr);
 #endif
     }
 
@@ -853,12 +860,14 @@ QV4::Bool Runtime::method_compareGreaterEqual(const Value &l, const Value &r)
         return l.integerValue() >= r.integerValue();
     if (l.isNumber() && r.isNumber())
         return l.asDouble() >= r.asDouble();
-    if (l.isString() && r.isString()) {
+    String *sl = l.stringValue();
+    String *sr = r.stringValue();
+    if (sl && sr) {
 #ifdef V4_BOOTSTRAP
         Q_UNIMPLEMENTED();
         return false;
 #else
-        return !l.stringValue()->compare(r.stringValue());
+        return !sl->compare(sr);
 #endif
     }
 
@@ -886,12 +895,14 @@ QV4::Bool Runtime::method_compareLessEqual(const Value &l, const Value &r)
         return l.integerValue() <= r.integerValue();
     if (l.isNumber() && r.isNumber())
         return l.asDouble() <= r.asDouble();
-    if (l.isString() && r.isString()) {
+    String *sl = l.stringValue();
+    String *sr = r.stringValue();
+    if (sl && sr) {
 #ifdef V4_BOOTSTRAP
         Q_UNIMPLEMENTED();
         return false;
 #else
-        return !r.stringValue()->compare(l.stringValue());
+        return !sr->compare(sl);
 #endif
     }
 
diff --git a/src/qml/jsruntime/qv4stringobject.cpp b/src/qml/jsruntime/qv4stringobject.cpp
index 68b693c5a0..6fbf1c3c85 100644
--- a/src/qml/jsruntime/qv4stringobject.cpp
+++ b/src/qml/jsruntime/qv4stringobject.cpp
@@ -218,8 +218,8 @@ static QString getThisString(ExecutionContext *ctx)
 {
     Scope scope(ctx);
     ScopedValue t(scope, ctx->thisObject());
-    if (t->isString())
-        return t->stringValue()->toQString();
+    if (String *s = t->stringValue())
+        return s->toQString();
     if (StringObject *thisString = t->as<StringObject>())
         return thisString->d()->string->toQString();
     if (t->isUndefined() || t->isNull()) {
@@ -282,13 +282,13 @@ ReturnedValue StringPrototype::method_concat(CallContext *context)
     if (scope.engine->hasException)
         return Encode::undefined();
 
-    ScopedValue v(scope);
+    ScopedString s(scope);
     for (int i = 0; i < context->argc(); ++i) {
-        v = context->args()[i].toString(scope.engine);
+        s = context->args()[i].toString(scope.engine);
         if (scope.hasException())
             return Encode::undefined();
-        Q_ASSERT(v->isString());
-        value += v->stringValue()->toQString();
+        Q_ASSERT(s->isString());
+        value += s->toQString();
     }
 
     return context->d()->engine->newString(value)->asReturnedValue();
diff --git a/src/qml/jsruntime/qv4value.cpp b/src/qml/jsruntime/qv4value.cpp
index 95c95b1974..ea5a3d491f 100644
--- a/src/qml/jsruntime/qv4value.cpp
+++ b/src/qml/jsruntime/qv4value.cpp
@@ -88,8 +88,8 @@ bool Value::toBoolean() const
 #ifdef V4_BOOTSTRAP
         Q_UNIMPLEMENTED();
 #else
-        if (isString())
-            return stringValue()->toQString().length() > 0;
+        if (String *s = stringValue())
+            return s->toQString().length() > 0;
 #endif
         return true;
     default: // double
@@ -114,8 +114,8 @@ double Value::toNumberImpl() const
 #ifdef V4_BOOTSTRAP
         Q_UNIMPLEMENTED();
 #else
-        if (isString())
-            return RuntimeHelpers::stringToNumber(stringValue()->toQString());
+        if (String *s = stringValue())
+            return RuntimeHelpers::stringToNumber(s->toQString());
     {
         Q_ASSERT(isObject());
         Scope scope(objectValue()->engine());
@@ -150,8 +150,8 @@ QString Value::toQStringNoThrow() const
         else
             return QStringLiteral("false");
     case Value::Managed_Type:
-        if (isString())
-            return stringValue()->toQString();
+        if (String *s = stringValue())
+            return s->toQString();
         {
             Q_ASSERT(isObject());
             Scope scope(objectValue()->engine());
@@ -203,8 +203,8 @@ QString Value::toQString() const
         else
             return QStringLiteral("false");
     case Value::Managed_Type:
-        if (isString())
-            return stringValue()->toQString();
+        if (String *s = stringValue())
+            return s->toQString();
         {
             Q_ASSERT(isObject());
             Scope scope(objectValue()->engine());
@@ -228,8 +228,10 @@ QString Value::toQString() const
 bool Value::sameValue(Value other) const {
     if (_val == other._val)
         return true;
-    if (isString() && other.isString())
-        return stringValue()->isEqualTo(other.stringValue());
+    String *s = stringValue();
+    String *os = other.stringValue();
+    if (s && os)
+        return s->isEqualTo(os);
     if (isInteger() && other.isDouble())
         return int_32() ? (double(int_32()) == other.doubleValue()) : (other._val == 0);
     if (isDouble() && other.isInteger())
@@ -298,8 +300,8 @@ double Primitive::toInteger(double number)
 #ifndef V4_BOOTSTRAP
 Heap::String *Value::toString(ExecutionEngine *e) const
 {
-    if (isString())
-        return stringValue()->d();
+    if (String *s = stringValue())
+        return s->d();
     return RuntimeHelpers::convertToString(e, *this);
 }
 
@@ -330,8 +332,8 @@ uint Value::asArrayLength(bool *ok) const
         }
         return idx;
     }
-    if (isString())
-        return stringValue()->toUInt(ok);
+    if (String *s = stringValue())
+        return s->toUInt(ok);
 
     uint idx = toUInt32();
     double d = toNumber();
diff --git a/src/qml/qml/qqmllocale.cpp b/src/qml/qml/qqmllocale.cpp
index 6f66475aa5..3876e774c3 100644
--- a/src/qml/qml/qqmllocale.cpp
+++ b/src/qml/qml/qqmllocale.cpp
@@ -107,8 +107,8 @@ QV4::ReturnedValue QQmlDateExtension::method_toLocaleString(QV4::CallContext *ct
     QLocale::FormatType enumFormat = QLocale::LongFormat;
     QString formattedDt;
     if (ctx->argc() == 2) {
-        if (ctx->args()[1].isString()) {
-            QString format = ctx->args()[1].stringValue()->toQString();
+        if (String *s = ctx->args()[1].stringValue()) {
+            QString format = s->toQString();
             formattedDt = r->d()->locale->toString(dt, format);
         } else if (ctx->args()[1].isNumber()) {
             quint32 intFormat = ctx->args()[1].toNumber();
@@ -152,8 +152,8 @@ QV4::ReturnedValue QQmlDateExtension::method_toLocaleTimeString(QV4::CallContext
     QLocale::FormatType enumFormat = QLocale::LongFormat;
     QString formattedTime;
     if (ctx->argc() == 2) {
-        if (ctx->args()[1].isString()) {
-            QString format = ctx->args()[1].stringValue()->toQString();
+        if (String *s = ctx->args()[1].stringValue()) {
+            QString format = s->toQString();
             formattedTime = r->d()->locale->toString(time, format);
         } else if (ctx->args()[1].isNumber()) {
             quint32 intFormat = ctx->args()[1].toNumber();
@@ -197,8 +197,8 @@ QV4::ReturnedValue QQmlDateExtension::method_toLocaleDateString(QV4::CallContext
     QLocale::FormatType enumFormat = QLocale::LongFormat;
     QString formattedDate;
     if (ctx->argc() == 2) {
-        if (ctx->args()[1].isString()) {
-            QString format = ctx->args()[1].stringValue()->toQString();
+        if (String *s = ctx->args()[1].stringValue()) {
+            QString format = s->toQString();
             formattedDate = r->d()->locale->toString(date, format);
         } else if (ctx->args()[1].isNumber()) {
             quint32 intFormat = ctx->args()[1].toNumber();
@@ -217,11 +217,13 @@ QV4::ReturnedValue QQmlDateExtension::method_toLocaleDateString(QV4::CallContext
 QV4::ReturnedValue QQmlDateExtension::method_fromLocaleString(QV4::CallContext *ctx)
 {
     QV4::ExecutionEngine * const engine = ctx->d()->engine;
-    if (ctx->argc() == 1 && ctx->args()[0].isString()) {
-        QLocale locale;
-        QString dateString = ctx->args()[0].stringValue()->toQString();
-        QDateTime dt = locale.toDateTime(dateString);
-        return QV4::Encode(engine->newDateObject(dt));
+    if (ctx->argc() == 1) {
+        if (String *s = ctx->args()[0].stringValue()) {
+            QLocale locale;
+            QString dateString = s->toQString();
+            QDateTime dt = locale.toDateTime(dateString);
+            return QV4::Encode(engine->newDateObject(dt));
+        }
     }
 
     QV4::Scope scope(ctx);
@@ -235,8 +237,8 @@ QV4::ReturnedValue QQmlDateExtension::method_fromLocaleString(QV4::CallContext *
     QDateTime dt;
     QString dateString = ctx->args()[1].toQStringNoThrow();
     if (ctx->argc() == 3) {
-        if (ctx->args()[2].isString()) {
-            QString format = ctx->args()[2].stringValue()->toQString();
+        if (String *s = ctx->args()[2].stringValue()) {
+            QString format = s->toQString();
             dt = r->d()->locale->toDateTime(dateString, format);
         } else if (ctx->args()[2].isNumber()) {
             quint32 intFormat = ctx->args()[2].toNumber();
@@ -256,13 +258,15 @@ QV4::ReturnedValue QQmlDateExtension::method_fromLocaleTimeString(QV4::CallConte
 {
     QV4::ExecutionEngine * const engine = ctx->d()->engine;
 
-    if (ctx->argc() == 1 && ctx->args()[0].isString()) {
-        QLocale locale;
-        QString timeString = ctx->args()[0].stringValue()->toQString();
-        QTime time = locale.toTime(timeString);
-        QDateTime dt = QDateTime::currentDateTime();
-        dt.setTime(time);
-        return QV4::Encode(engine->newDateObject(dt));
+    if (ctx->argc() == 1) {
+        if (String *s = ctx->args()[0].stringValue()) {
+            QLocale locale;
+            QString timeString = s->toQString();
+            QTime time = locale.toTime(timeString);
+            QDateTime dt = QDateTime::currentDateTime();
+            dt.setTime(time);
+            return QV4::Encode(engine->newDateObject(dt));
+        }
     }
 
     if (ctx->argc() < 1 || ctx->argc() > 3 || !isLocaleObject(ctx->args()[0]))
@@ -276,8 +280,8 @@ QV4::ReturnedValue QQmlDateExtension::method_fromLocaleTimeString(QV4::CallConte
     QTime tm;
     QString dateString = ctx->args()[1].toQStringNoThrow();
     if (ctx->argc() == 3) {
-        if (ctx->args()[2].isString()) {
-            QString format = ctx->args()[2].stringValue()->toQString();
+        if (String *s = ctx->args()[2].stringValue()) {
+            QString format = s->toQString();
             tm = r->d()->locale->toTime(dateString, format);
         } else if (ctx->args()[2].isNumber()) {
             quint32 intFormat = ctx->args()[2].toNumber();
@@ -303,11 +307,13 @@ QV4::ReturnedValue QQmlDateExtension::method_fromLocaleDateString(QV4::CallConte
 {
     QV4::ExecutionEngine * const engine = ctx->d()->engine;
 
-    if (ctx->argc() == 1 && ctx->args()[0].isString()) {
-        QLocale locale;
-        QString dateString = ctx->args()[0].stringValue()->toQString();
-        QDate date = locale.toDate(dateString);
-        return QV4::Encode(engine->newDateObject(QDateTime(date)));
+    if (ctx->argc() == 1) {
+        if (String *s = ctx->args()[0].stringValue()) {
+            QLocale locale;
+            QString dateString = s->toQString();
+            QDate date = locale.toDate(dateString);
+            return QV4::Encode(engine->newDateObject(QDateTime(date)));
+        }
     }
 
     if (ctx->argc() < 1 || ctx->argc() > 3 || !isLocaleObject(ctx->args()[0]))
@@ -321,8 +327,8 @@ QV4::ReturnedValue QQmlDateExtension::method_fromLocaleDateString(QV4::CallConte
     QDate dt;
     QString dateString = ctx->args()[1].toQStringNoThrow();
     if (ctx->argc() == 3) {
-        if (ctx->args()[2].isString()) {
-            QString format = ctx->args()[2].stringValue()->toQString();
+        if (String *s = ctx->args()[2].stringValue()) {
+            QString format = s->toQString();
             dt = r->d()->locale->toDate(dateString, format);
         } else if (ctx->args()[2].isNumber()) {
             quint32 intFormat = ctx->args()[2].toNumber();
diff --git a/src/qml/qml/qqmlvmemetaobject.cpp b/src/qml/qml/qqmlvmemetaobject.cpp
index b08a0e5087..d2cbb99b6a 100644
--- a/src/qml/qml/qqmlvmemetaobject.cpp
+++ b/src/qml/qml/qqmlvmemetaobject.cpp
@@ -489,9 +489,9 @@ QString QQmlVMEMetaObject::readPropertyAsString(int id)
 
     QV4::Scope scope(cache->engine);
     QV4::ScopedValue sv(scope, *(md->data() + id));
-    if (!sv->isString())
-        return QString();
-    return sv->stringValue()->toQString();
+    if (QV4::String *s = sv->stringValue())
+        return s->toQString();
+    return QString();
 }
 
 QUrl QQmlVMEMetaObject::readPropertyAsUrl(int id)
diff --git a/src/qml/types/qqmllistmodel.cpp b/src/qml/types/qqmllistmodel.cpp
index 2ba164f721..8574a4784c 100644
--- a/src/qml/types/qqmllistmodel.cpp
+++ b/src/qml/types/qqmllistmodel.cpp
@@ -505,10 +505,10 @@ void ListModel::set(int elementIndex, QV4::Object *object)
             break;
 
         // Add the value now
-        if (propertyValue->isString()) {
+        if (QV4::String *s = propertyValue->stringValue()) {
             const ListLayout::Role &r = m_layout->getRoleOrCreate(propertyName, ListLayout::Role::String);
             if (r.type == ListLayout::Role::String)
-                e->setStringPropertyFast(r, propertyValue->stringValue()->toQString());
+                e->setStringPropertyFast(r, s->toQString());
         } else if (propertyValue->isNumber()) {
             const ListLayout::Role &r = m_layout->getRoleOrCreate(propertyName, ListLayout::Role::Number);
             if (r.type == ListLayout::Role::Number) {