QTestLib: Fix various clang warnings

- Fix else after return/break
- Fix use of int as boolean literal
- Use range-based for in some cases
- Avoid copies by using const-ref
- Remove unnecessary null-check before delete

Task-number: QTBUG-69413
Change-Id: I69f46e6deaa55ef70a8b3a61e6539c79a64aaa23
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>

src/testlib/qbenchmark.cpp

@@ -66,8 +66,7 @@ void QBenchmarkGlobalData::setMode(Mode mode)
 {
     mode_ = mode;
 
-    if (measurer)
-        delete measurer;
+    delete measurer;
     measurer = createMeasurer();
 }
 
@@ -98,11 +97,8 @@ QBenchmarkMeasurerBase * QBenchmarkGlobalData::createMeasurer()
 
 int QBenchmarkGlobalData::adjustMedianIterationCount()
 {
-    if (medianIterationCount != -1) {
-        return medianIterationCount;
-    } else {
-        return measurer->adjustMedianCount(1);
-    }
+    return medianIterationCount != -1
+        ? medianIterationCount : measurer->adjustMedianCount(1);
 }
 
 

src/testlib/qbenchmarkmeasurement_p.h

@@ -66,7 +66,7 @@ public:
     virtual bool isMeasurementAccepted(qint64 measurement) = 0;
     virtual int adjustIterationCount(int suggestion) = 0;
     virtual int adjustMedianCount(int suggestion) = 0;
-    virtual bool repeatCount() { return 1; }
+    virtual bool repeatCount() { return true; }
     virtual bool needsWarmupIteration() { return false; }
     virtual QTest::QBenchmarkMetric metricType() = 0;
 };

src/testlib/qbenchmarkperfevents_p.h

@@ -67,7 +67,7 @@ public:
     bool isMeasurementAccepted(qint64 measurement) override;
     int adjustIterationCount(int suggestion) override;
     int adjustMedianCount(int suggestion) override;
-    bool repeatCount() override { return 1; }
+    bool repeatCount() override { return true; }
     bool needsWarmupIteration() override { return true; }
     QTest::QBenchmarkMetric metricType() override;
 

src/testlib/qbenchmarkvalgrind.cpp

@@ -168,7 +168,7 @@ QString QBenchmarkValgrindUtils::outFileBase(qint64 pid)
 // Returns \c true upon success, otherwise false.
 bool QBenchmarkValgrindUtils::runCallgrindSubProcess(const QStringList &origAppArgs, int &exitCode)
 {
-    const QString execFile(origAppArgs.at(0));
+    const QString &execFile = origAppArgs.at(0);
     QStringList args;
     args << QLatin1String("--tool=callgrind") << QLatin1String("--instr-atstart=yes")
          << QLatin1String("--quiet")
@@ -177,7 +177,7 @@ bool QBenchmarkValgrindUtils::runCallgrindSubProcess(const QStringList &origAppA
     // pass on original arguments that make sense (e.g. avoid wasting time producing output
     // that will be ignored anyway) ...
     for (int i = 1; i < origAppArgs.size(); ++i) {
-        const QString arg(origAppArgs.at(i));
+        const QString &arg = origAppArgs.at(i);
         if (arg == QLatin1String("-callgrind"))
             continue;
         args << arg; // ok to pass on

src/testlib/qteamcitylogger.cpp

@@ -222,9 +222,7 @@ QString QTeamCityLogger::tcEscapedString(const QString &str) const
 {
     QString formattedString;
 
-    for (int i = 0; i < str.length(); i++) {
-        QChar ch = str.at(i);
-
+    for (QChar ch : str) {
         switch (ch.toLatin1()) {
         case '\n':
             formattedString.append(QLatin1String("|n"));

src/testlib/qtestblacklist.cpp

@@ -210,11 +210,10 @@ static bool checkCondition(const QByteArray &condition)
     static const QSet<QByteArray> matchedConditions = activeConditions();
     QList<QByteArray> conds = condition.split(' ');
 
-    for (int i = 0; i < conds.size(); ++i) {
-        QByteArray c = conds.at(i);
+    for (QByteArray c : conds) {
         bool result = c.startsWith('!');
         if (result)
-            c = c.mid(1);
+            c.remove(0, 1);
 
         result ^= matchedConditions.contains(c);
         if (!result)

src/testlib/qtestcase.cpp

@@ -1040,7 +1040,7 @@ public:
     void run() override {
         QMutexLocker locker(&mutex);
         waitCondition.wakeAll();
-        while (1) {
+        while (true) {
             int t = timeout.loadRelaxed();
             if (!t)
                 break;
@@ -1273,10 +1273,8 @@ char *toHexRepresentation(const char *ba, int length)
         ++o;
         if (i == len)
             break;
-        else {
-            result[o] = ' ';
-            ++o;
-        }
+        result[o] = ' ';
+        ++o;
     }
 
     return result;

src/testlib/qxmltestlogger.cpp

@@ -180,23 +180,20 @@ inline static bool isEmpty(const char *str)
 static const char *incidentFormatString(bool noDescription, bool noTag)
 {
     if (noDescription) {
-        if (noTag)
-            return "<Incident type=\"%s\" file=\"%s\" line=\"%d\" />\n";
-        else
-            return "<Incident type=\"%s\" file=\"%s\" line=\"%d\">\n"
+        return noTag
+            ?   "<Incident type=\"%s\" file=\"%s\" line=\"%d\" />\n"
+            :   "<Incident type=\"%s\" file=\"%s\" line=\"%d\">\n"
                 "    <DataTag><![CDATA[%s%s%s%s]]></DataTag>\n"
                 "</Incident>\n";
-    } else {
-        if (noTag)
-            return "<Incident type=\"%s\" file=\"%s\" line=\"%d\">\n"
-                "    <Description><![CDATA[%s%s%s%s]]></Description>\n"
-                "</Incident>\n";
-        else
-            return "<Incident type=\"%s\" file=\"%s\" line=\"%d\">\n"
-                "    <DataTag><![CDATA[%s%s%s]]></DataTag>\n"
-                "    <Description><![CDATA[%s]]></Description>\n"
-                "</Incident>\n";
     }
+    return noTag
+        ? "<Incident type=\"%s\" file=\"%s\" line=\"%d\">\n"
+          "    <Description><![CDATA[%s%s%s%s]]></Description>\n"
+          "</Incident>\n"
+        : "<Incident type=\"%s\" file=\"%s\" line=\"%d\">\n"
+          "    <DataTag><![CDATA[%s%s%s]]></DataTag>\n"
+          "    <Description><![CDATA[%s]]></Description>\n"
+          "</Incident>\n";
 }
 
 static const char *benchmarkResultFormatString()