Don't use QStringLiteral in comparisons

For QLatin1String, operator== is overloaded, so comparing to a latin-1
(C) string literal is efficient, since strlen() is comparatively fast.

OTOH, QStringLiteral, when not using RVO, litters the code with
QString dtor calls, which are not inline. Worse, absent lambdas,
it even allocates memory.

So, just compare using QLatin1String instead.

Change-Id: I761b2b26ab5b416bc695f524a9ee607dacf0a7b2
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>

12 files changed, 69 insertions, 71 deletions

diff --git a/src/network/kernel/qnetworkproxy_libproxy.cpp b/src/network/kernel/qnetworkproxy_libproxy.cpp
index 1df9d674e7..c7d1d48605 100644
--- a/src/network/kernel/qnetworkproxy_libproxy.cpp
+++ b/src/network/kernel/qnetworkproxy_libproxy.cpp
@@ -121,14 +121,14 @@ QList<QNetworkProxy> QNetworkProxyFactory::systemProxyForQuery(const QNetworkPro
     bool haveDirectConnection = false;
     foreach (const QUrl& url, rawProxies) {
         QNetworkProxy::ProxyType type;
-        if (url.scheme() == QStringLiteral("http")) {
+        if (url.scheme() == QLatin1String("http")) {
             type = QNetworkProxy::HttpProxy;
-        } else if (url.scheme() == QStringLiteral("socks")
-              || url.scheme() == QStringLiteral("socks5")) {
+        } else if (url.scheme() == QLatin1String("socks")
+              || url.scheme() == QLatin1String("socks5")) {
             type = QNetworkProxy::Socks5Proxy;
-        } else if (url.scheme() == QStringLiteral("ftp")) {
+        } else if (url.scheme() == QLatin1String("ftp")) {
             type = QNetworkProxy::FtpCachingProxy;
-        } else if (url.scheme() == QStringLiteral("direct")) {
+        } else if (url.scheme() == QLatin1String("direct")) {
             type = QNetworkProxy::NoProxy;
             haveDirectConnection = true;
         } else {
diff --git a/src/platformsupport/linuxaccessibility/atspiadaptor.cpp b/src/platformsupport/linuxaccessibility/atspiadaptor.cpp
index 0293c74fb9..f902ec230b 100644
--- a/src/platformsupport/linuxaccessibility/atspiadaptor.cpp
+++ b/src/platformsupport/linuxaccessibility/atspiadaptor.cpp
@@ -1961,71 +1961,71 @@ namespace
         // https://bugzilla.gnome.org/show_bug.cgi?id=744553 "ATK docs provide no guidance for allowed values of some text attributes"
         // specifically for "weight", "invalid", "language" and value range for colors
 
-        if (ia2Name == QStringLiteral("background-color")) {
+        if (ia2Name == QLatin1String("background-color")) {
             name = QStringLiteral("bg-color");
             value = atspiColor(value);
-        } else if (ia2Name == QStringLiteral("font-family")) {
+        } else if (ia2Name == QLatin1String("font-family")) {
             name = QStringLiteral("family-name");
-        } else if (ia2Name == QStringLiteral("color")) {
+        } else if (ia2Name == QLatin1String("color")) {
             name = QStringLiteral("fg-color");
             value = atspiColor(value);
-        } else if (ia2Name == QStringLiteral("text-align")) {
+        } else if (ia2Name == QLatin1String("text-align")) {
             name = QStringLiteral("justification");
-            if (value == QStringLiteral("justify")) {
+            if (value == QLatin1String("justify")) {
                 value = QStringLiteral("fill");
             } else {
-                if (value != QStringLiteral("left") &&
-                    value != QStringLiteral("right") &&
-                    value != QStringLiteral("center")
+                if (value != QLatin1String("left") &&
+                    value != QLatin1String("right") &&
+                    value != QLatin1String("center")
                 ) {
                     value = QString();
                     qAtspiDebug() << "Unknown text-align attribute value \"" << value << "\" cannot be translated to AT-SPI.";
                 }
             }
-        } else if (ia2Name == QStringLiteral("font-size")) {
+        } else if (ia2Name == QLatin1String("font-size")) {
             name = QStringLiteral("size");
             value = atspiSize(value);
-        } else if (ia2Name == QStringLiteral("font-style")) {
+        } else if (ia2Name == QLatin1String("font-style")) {
             name = QStringLiteral("style");
-            if (value != QStringLiteral("normal") &&
-                value != QStringLiteral("italic") &&
-                value != QStringLiteral("oblique")
+            if (value != QLatin1String("normal") &&
+                value != QLatin1String("italic") &&
+                value != QLatin1String("oblique")
             ) {
                 value = QString();
                 qAtspiDebug() << "Unknown font-style attribute value \"" << value << "\" cannot be translated to AT-SPI.";
             }
-        } else if (ia2Name == QStringLiteral("text-underline-type")) {
+        } else if (ia2Name == QLatin1String("text-underline-type")) {
             name = QStringLiteral("underline");
-            if (value != QStringLiteral("none") &&
-                value != QStringLiteral("single") &&
-                value != QStringLiteral("double")
+            if (value != QLatin1String("none") &&
+                value != QLatin1String("single") &&
+                value != QLatin1String("double")
             ) {
                 value = QString();
                 qAtspiDebug() << "Unknown text-underline-type attribute value \"" << value << "\" cannot be translated to AT-SPI.";
             }
-        } else if (ia2Name == QStringLiteral("font-weight")) {
+        } else if (ia2Name == QLatin1String("font-weight")) {
             name = QStringLiteral("weight");
-            if (value == QStringLiteral("normal"))
+            if (value == QLatin1String("normal"))
                 // Orca seems to accept all IAccessible2 values except for "normal"
                 // (on which it produces traceback and fails to read any following text attributes),
                 // but that is the default value, so omit it anyway
                 value = QString();
-        } else if (ia2Name == QStringLiteral("text-position")) {
+        } else if (ia2Name == QLatin1String("text-position")) {
             name = QStringLiteral("vertical-align");
-            if (value != QStringLiteral("baseline") &&
-                value != QStringLiteral("super") &&
-                value != QStringLiteral("sub")
+            if (value != QLatin1String("baseline") &&
+                value != QLatin1String("super") &&
+                value != QLatin1String("sub")
             ) {
                 value = QString();
                 qAtspiDebug() << "Unknown text-position attribute value \"" << value << "\" cannot be translated to AT-SPI.";
             }
-        } else if (ia2Name == QStringLiteral("writing-mode")) {
+        } else if (ia2Name == QLatin1String("writing-mode")) {
             name = QStringLiteral("direction");
-            if (value == QStringLiteral("lr"))
+            if (value == QLatin1String("lr"))
                 value = QStringLiteral("ltr");
-            else if (value == QStringLiteral("rl"))
+            else if (value == QLatin1String("rl"))
                 value = QStringLiteral("rtl");
-            else if (value == QStringLiteral("tb")) {
+            else if (value == QLatin1String("tb")) {
                 // IAccessible2 docs refer to XSL, which specifies "tb" is shorthand for "tb-rl"; so at least give a hint about the horizontal direction (ATK does not support vertical direction in this attribute (yet))
                 value = QStringLiteral("rtl");
                 qAtspiDebug() << "writing-mode attribute value \"tb\" translated only w.r.t. horizontal direction; vertical direction ignored";
@@ -2033,9 +2033,9 @@ namespace
                 value = QString();
                 qAtspiDebug() << "Unknown writing-mode attribute value \"" << value << "\" cannot be translated to AT-SPI.";
             }
-        } else if (ia2Name == QStringLiteral("language")) {
+        } else if (ia2Name == QLatin1String("language")) {
             // OK - ATK has no docs on the format of the value, IAccessible2 has reasonable format - leave it at that now
-        } else if (ia2Name == QStringLiteral("invalid")) {
+        } else if (ia2Name == QLatin1String("invalid")) {
             // OK - ATK docs are vague but suggest they support the same range of values as IAccessible2
         } else {
             // attribute we know nothing about
diff --git a/src/plugins/bearer/networkmanager/qnetworkmanagerengine.cpp b/src/plugins/bearer/networkmanager/qnetworkmanagerengine.cpp
index 3b8a85a26b..42037ffb9a 100644
--- a/src/plugins/bearer/networkmanager/qnetworkmanagerengine.cpp
+++ b/src/plugins/bearer/networkmanager/qnetworkmanagerengine.cpp
@@ -1030,17 +1030,17 @@ QNetworkConfiguration::BearerType QNetworkManagerEngine::currentBearerType(const
 
             QString bearer = i.value()->bearer();
 
-            if (bearer == QStringLiteral("gsm")) {
+            if (bearer == QLatin1String("gsm")) {
                 return QNetworkConfiguration::Bearer2G;
-            } else if (bearer == QStringLiteral("edge")) {
+            } else if (bearer == QLatin1String("edge")) {
                 return QNetworkConfiguration::Bearer2G;
-            } else if (bearer == QStringLiteral("umts")) {
+            } else if (bearer == QLatin1String("umts")) {
                 return QNetworkConfiguration::BearerWCDMA;
-            } else if (bearer == QStringLiteral("hspa")
-                       || bearer == QStringLiteral("hsdpa")
-                       || bearer == QStringLiteral("hsupa")) {
+            } else if (bearer == QLatin1String("hspa")
+                       || bearer == QLatin1String("hsdpa")
+                       || bearer == QLatin1String("hsupa")) {
                 return QNetworkConfiguration::BearerHSPA;
-            } else if (bearer == QStringLiteral("lte")) {
+            } else if (bearer == QLatin1String("lte")) {
                 return QNetworkConfiguration::BearerLTE;
             }
         }
diff --git a/src/plugins/bearer/networkmanager/qnetworkmanagerservice.cpp b/src/plugins/bearer/networkmanager/qnetworkmanagerservice.cpp
index fc9a3281b8..d550887ba6 100644
--- a/src/plugins/bearer/networkmanager/qnetworkmanagerservice.cpp
+++ b/src/plugins/bearer/networkmanager/qnetworkmanagerservice.cpp
@@ -214,7 +214,7 @@ void QNetworkManagerInterface::propertiesSwap(QMap<QString,QVariant> map)
         i.next();
         propertyMap.insert(i.key(),i.value());
 
-        if (i.key() == QStringLiteral("State")) {
+        if (i.key() == QLatin1String("State")) {
             quint32 state = i.value().toUInt();
             if (state == NM_DEVICE_STATE_ACTIVATED
                 || state == NM_DEVICE_STATE_DISCONNECTED
@@ -223,7 +223,7 @@ void QNetworkManagerInterface::propertiesSwap(QMap<QString,QVariant> map)
                 Q_EMIT propertiesChanged(map);
                 Q_EMIT stateChanged(state);
             }
-        } else if (i.key() == QStringLiteral("ActiveConnections")) {
+        } else if (i.key() == QLatin1String("ActiveConnections")) {
             Q_EMIT propertiesChanged(map);
         }
     }
@@ -418,7 +418,7 @@ void QNetworkManagerInterfaceDevice::propertiesSwap(QMap<QString,QVariant> map)
     QMapIterator<QString, QVariant> i(map);
     while (i.hasNext()) {
         i.next();
-        if (i.key() == QStringLiteral("AvailableConnections")) { //Device
+        if (i.key() == QLatin1String("AvailableConnections")) { //Device
             const QDBusArgument &dbusArgs = i.value().value<QDBusArgument>();
             QDBusObjectPath path;
             QStringList paths;
@@ -514,9 +514,8 @@ void QNetworkManagerInterfaceDeviceWired::propertiesSwap(QMap<QString,QVariant>
     while (i.hasNext()) {
         i.next();
         propertyMap.insert(i.key(),i.value());
-        if (i.key() == QStringLiteral("Carrier")) {
+        if (i.key() == QLatin1String("Carrier"))
             Q_EMIT carrierChanged(i.value().toBool());
-        }
     }
     Q_EMIT propertiesChanged(map);
 }
@@ -693,9 +692,8 @@ void QNetworkManagerInterfaceDeviceWireless::propertiesSwap(QMap<QString,QVarian
     while (i.hasNext()) {
         i.next();
         propertyMap.insert(i.key(),i.value());
-        if (i.key() == QStringLiteral("ActiveAccessPoint")) { //DeviceWireless
+        if (i.key() == QLatin1String("ActiveAccessPoint")) //DeviceWireless
             Q_EMIT propertiesChanged(map);
-        }
     }
 }
 
@@ -1051,7 +1049,7 @@ void QNetworkManagerConnectionActive::propertiesSwap(QMap<QString,QVariant> map)
     while (i.hasNext()) {
         i.next();
         propertyMap.insert(i.key(),i.value());
-        if (i.key() == QStringLiteral("State")) {
+        if (i.key() == QLatin1String("State")) {
             quint32 state = i.value().toUInt();
             if (state == NM_ACTIVE_CONNECTION_STATE_ACTIVATED
                 || state == NM_ACTIVE_CONNECTION_STATE_DEACTIVATED) {
diff --git a/src/plugins/platforms/haiku/qhaikuclipboard.cpp b/src/plugins/platforms/haiku/qhaikuclipboard.cpp
index a2d7e96d71..9b2fe3cfa3 100644
--- a/src/plugins/platforms/haiku/qhaikuclipboard.cpp
+++ b/src/plugins/platforms/haiku/qhaikuclipboard.cpp
@@ -86,9 +86,9 @@ QMimeData *QHaikuClipboard::mimeData(QClipboard::Mode mode)
             const status_t status = clipboard->FindData(name, B_MIME_TYPE, &data, &dataLen);
             if (dataLen && (status == B_OK)) {
                 const QString format = QString::fromLatin1(name);
-                if (format == QStringLiteral("text/plain")) {
+                if (format == QLatin1String("text/plain")) {
                     m_systemMimeData->setText(QString::fromLocal8Bit(reinterpret_cast<const char*>(data), dataLen));
-                } else if (format == QStringLiteral("text/html")) {
+                } else if (format == QLatin1String("text/html")) {
                     m_systemMimeData->setHtml(QString::fromLocal8Bit(reinterpret_cast<const char*>(data), dataLen));
                 } else {
                     m_systemMimeData->setData(format, QByteArray(reinterpret_cast<const char*>(data), dataLen));
diff --git a/src/plugins/platforms/windows/qwindowsfontdatabase.cpp b/src/plugins/platforms/windows/qwindowsfontdatabase.cpp
index 8a2fbe1f6d..bf42ca190b 100644
--- a/src/plugins/platforms/windows/qwindowsfontdatabase.cpp
+++ b/src/plugins/platforms/windows/qwindowsfontdatabase.cpp
@@ -1613,7 +1613,7 @@ LOGFONT QWindowsFontDatabase::fontDefToLOGFONT(const QFontDef &request)
     if (fam.isEmpty())
         fam = QStringLiteral("MS Sans Serif");
 
-    if ((fam == QStringLiteral("MS Sans Serif"))
+    if (fam == QLatin1String("MS Sans Serif")
         && (request.style == QFont::StyleItalic || (-lf.lfHeight > 18 && -lf.lfHeight != 24))) {
         fam = QStringLiteral("Arial"); // MS Sans Serif has bearing problems in italic, and does not scale
     }
diff --git a/src/plugins/platforms/windows/qwindowsmime.cpp b/src/plugins/platforms/windows/qwindowsmime.cpp
index 171ace5c20..eaaf2820ee 100644
--- a/src/plugins/platforms/windows/qwindowsmime.cpp
+++ b/src/plugins/platforms/windows/qwindowsmime.cpp
@@ -1145,7 +1145,7 @@ QVariant QWindowsMimeImage::convertToMime(const QString &mimeType, IDataObject *
 {
     Q_UNUSED(preferredType);
     QVariant result;
-    if (mimeType != QStringLiteral("application/x-qt-image"))
+    if (mimeType != QLatin1String("application/x-qt-image"))
         return result;
     //Try to convert from a format which has more data
     //DIBV5, use only if its is not synthesized
diff --git a/src/plugins/platforms/xcb/qxcbconnection.cpp b/src/plugins/platforms/xcb/qxcbconnection.cpp
index abb48034cd..9cedd296e1 100644
--- a/src/plugins/platforms/xcb/qxcbconnection.cpp
+++ b/src/plugins/platforms/xcb/qxcbconnection.cpp
@@ -639,7 +639,7 @@ QXcbConnection::QXcbConnection(QXcbNativeInterface *nativeInterface, bool canGra
     QString glIntegrationName = QString::fromLocal8Bit(qgetenv("QT_XCB_GL_INTEGRATION"));
     if (!glIntegrationName.isEmpty()) {
         qCDebug(QT_XCB_GLINTEGRATION) << "QT_XCB_GL_INTEGRATION is set to" << glIntegrationName;
-        if (glIntegrationName != QStringLiteral("none")) {
+        if (glIntegrationName != QLatin1String("none")) {
             glIntegrationNames.removeAll(glIntegrationName);
             glIntegrationNames.prepend(glIntegrationName);
         } else {
diff --git a/src/plugins/printsupport/cocoa/main.cpp b/src/plugins/printsupport/cocoa/main.cpp
index 3db7b49ba4..2733c3fa60 100644
--- a/src/plugins/printsupport/cocoa/main.cpp
+++ b/src/plugins/printsupport/cocoa/main.cpp
@@ -49,7 +49,7 @@ public:
 
 QPlatformPrinterSupport *QCocoaPrinterSupportPlugin::create(const QString &key)
 {
-    if (key.compare(key, QStringLiteral("cocoaprintersupport"), Qt::CaseInsensitive) != 0)
+    if (key.compare(key, QLatin1String("cocoaprintersupport"), Qt::CaseInsensitive) != 0)
         return 0;
     QGuiApplication *app = qobject_cast<QGuiApplication *>(QCoreApplication::instance());
     if (!app)
diff --git a/tools/configure/configureapp.cpp b/tools/configure/configureapp.cpp
index 160ccf5778..555ccbf740 100644
--- a/tools/configure/configureapp.cpp
+++ b/tools/configure/configureapp.cpp
@@ -1094,7 +1094,7 @@ void Configure::parseCmdLine()
             if (i == argCount)
                 break;
             QString mod = configCmdLine.at(i);
-            if (!mod.startsWith(QStringLiteral("qt")))
+            if (!mod.startsWith(QLatin1String("qt")))
                 mod.insert(0, QStringLiteral("qt"));
             if (!QFileInfo(sourcePath + "/../" + mod).isDir()) {
                 cout << "Attempting to skip non-existent module " << mod << "." << endl;
@@ -3810,7 +3810,7 @@ void Configure::displayConfig()
         env = "Unset";
     sout << "    PATH=\n      " << env << endl;
 
-    if (dictionary[QStringLiteral("EDITION")] != QStringLiteral("OpenSource")) {
+    if (dictionary[QStringLiteral("EDITION")] != QLatin1String("OpenSource")) {
         QString l1 = dictionary[ "LICENSEE" ];
         QString l2 = dictionary[ "LICENSEID" ];
         QString l3 = dictionary["EDITION"] + ' ' + "Edition";
diff --git a/util/glgen/codegenerator.cpp b/util/glgen/codegenerator.cpp
index f590e42960..15db4d0a83 100644
--- a/util/glgen/codegenerator.cpp
+++ b/util/glgen/codegenerator.cpp
@@ -389,11 +389,11 @@ QString CodeGenerator::passByType(const Argument &arg) const
 
 QString CodeGenerator::safeArgumentName(const QString& arg) const
 {
-    if (arg == QStringLiteral("near")) // MS Windows defines near and far
+    if (arg == QLatin1String("near")) // MS Windows defines near and far
         return QStringLiteral("nearVal");
-    else if (arg == QStringLiteral("far"))
+    else if (arg == QLatin1String("far"))
         return QStringLiteral("farVal");
-    else if (arg == QStringLiteral("d"))
+    else if (arg == QLatin1String("d"))
         return QStringLiteral("dd"); // Don't shadow d pointer
     else
         return arg;
@@ -810,7 +810,7 @@ void CodeGenerator::writeInlineFunction(QTextStream &stream, const QString &clas
         argumentNames.append(safeArgumentName(arg.name));
     QString argNames = argumentNames.join(", ");
 
-    if (f.returnType == QStringLiteral("void"))
+    if (f.returnType == QLatin1String("void"))
         stream << QString(QStringLiteral("    %1->%2(%3);")).arg(backendVar).arg(f.name).arg(argNames) << endl;
     else
         stream << QString(QStringLiteral("    return %1->%2(%3);")).arg(backendVar).arg(f.name).arg(argNames) << endl;
diff --git a/util/glgen/legacyspecparser.cpp b/util/glgen/legacyspecparser.cpp
index fc34eca80c..77b106bd5d 100644
--- a/util/glgen/legacyspecparser.cpp
+++ b/util/glgen/legacyspecparser.cpp
@@ -80,7 +80,7 @@ bool LegacySpecParser::parseTypeMap()
     while (!stream.atEnd()) {
         QString line = stream.readLine();
 
-        if (line.startsWith(QStringLiteral("#")))
+        if (line.startsWith(QLatin1Char('#')))
             continue;
 
         if (typeMapRegExp.indexIn(line) != -1) {
@@ -88,7 +88,7 @@ bool LegacySpecParser::parseTypeMap()
             QString value = typeMapRegExp.cap(2).simplified();
 
             // Special case for void
-            if (value == QStringLiteral("*"))
+            if (value == QLatin1String("*"))
                 value = QStringLiteral("void");
 
             m_typeMap.insert(key, value);
@@ -144,7 +144,7 @@ void LegacySpecParser::parseFunctions(QTextStream &stream)
                 // extension. These functions should be added to the DSA extension rather
                 // than the core functionality. The core will already contain non-DSA
                 // versions of these functions.
-                if (acceptCurrentFunctionInCore && currentFunction.name.endsWith(QStringLiteral("EXT"))) {
+                if (acceptCurrentFunctionInCore && currentFunction.name.endsWith(QLatin1String("EXT"))) {
                     acceptCurrentFunctionInCore = false;
                     acceptCurrentFunctionInExtension = true;
                     currentCategory = QStringLiteral("EXT_direct_state_access");
@@ -191,9 +191,9 @@ void LegacySpecParser::parseFunctions(QTextStream &stream)
             arg.type = m_typeMap.value(type);
 
             QString direction = argumentRegExp.cap(3);
-            if (direction == QStringLiteral("in")) {
+            if (direction == QLatin1String("in")) {
                 arg.direction = Argument::In;
-            } else if (direction == QStringLiteral("out")) {
+            } else if (direction == QLatin1String("out")) {
                 arg.direction = Argument::Out;
             } else {
                 qWarning() << "Invalid argument direction found:" << direction;
@@ -201,11 +201,11 @@ void LegacySpecParser::parseFunctions(QTextStream &stream)
             }
 
             QString mode = argumentRegExp.cap(4);
-            if (mode == QStringLiteral("value")) {
+            if (mode == QLatin1String("value")) {
                 arg.mode = Argument::Value;
-            } else if (mode == QStringLiteral("array")) {
+            } else if (mode == QLatin1String("array")) {
                 arg.mode = Argument::Array;
-            } else if (mode == QStringLiteral("reference")) {
+            } else if (mode == QLatin1String("reference")) {
                 arg.mode = Argument::Reference;
             } else {
                 qWarning() << "Invalid argument mode found:" << mode;
@@ -246,7 +246,7 @@ void LegacySpecParser::parseFunctions(QTextStream &stream)
             // Extract the OpenGL version in which this function was deprecated.
             // If it is OpenGL 3.1 then it must be a compatibility profile function
             QString deprecatedVersion = deprecatedRegExp.cap(1).simplified();
-            if (deprecatedVersion == QStringLiteral("3.1") && !inDeprecationException(currentFunction.name))
+            if (deprecatedVersion == QLatin1String("3.1") && !inDeprecationException(currentFunction.name))
                 currentVersionProfile.profile = VersionProfile::CompatibilityProfile;
 
         } else if (categoryRegExp.indexIn(line) != -1) {
@@ -301,5 +301,5 @@ void LegacySpecParser::parseFunctions(QTextStream &stream)
 
 bool LegacySpecParser::inDeprecationException(const QString &functionName) const
 {
-    return (functionName == QStringLiteral("TexImage3D"));
+    return functionName == QLatin1String("TexImage3D");
 }