Some micro optimizations (#1346)

src/Main.cpp

@@ -40,7 +40,7 @@ int main(int argc, char *argv[])
         UpdateWorker *updateWorker = new UpdateWorker;
         QObject::connect(updateWorker, &UpdateWorker::checkComplete,
                          [=](const QVersionNumber &version, const QString & error) {
-            if (error == "" && version > UpdateWorker::currentVersionNumber()) {
+            if (error.isEmpty() && version > UpdateWorker::currentVersionNumber()) {
                 updateWorker->showUpdateDialog(true);
             }
             updateWorker->deleteLater();

src/common/AsyncTask.cpp

@@ -47,7 +47,7 @@ void AsyncTask::run()
 
     running = true;
 
-    logBuffer = "";
+    logBuffer.clear();
     emit logChanged(logBuffer);
     runTask();
 
@@ -60,7 +60,7 @@ void AsyncTask::run()
 
 void AsyncTask::log(QString s)
 {
-    logBuffer += s + "\n";
+    logBuffer += s.append(QLatin1Char('\n'));
     emit logChanged(logBuffer);
 }
 

src/common/BasicBlockHighlighter.cpp

@@ -6,8 +6,8 @@ BasicBlockHighlighter::BasicBlockHighlighter()
 
 BasicBlockHighlighter::~BasicBlockHighlighter()
 {
-    for (BasicBlockIt itr = bbMap.begin(); itr != bbMap.end(); itr++) {
-	delete itr->second;
+    for (BasicBlockIt itr = bbMap.begin(); itr != bbMap.end(); ++itr) {
+        delete itr->second;
     }
 }
 

src/common/RichTextPainter.cpp

@@ -109,7 +109,7 @@ RichTextPainter::List RichTextPainter::fromTextDocument(const QTextDocument &doc
     List r;
 
     for (QTextBlock block = doc.begin(); block != doc.end(); block = block.next()) {
-        for (QTextBlock::iterator it = block.begin(); it != block.end(); it++) {
+        for (QTextBlock::iterator it = block.begin(); it != block.end(); ++it) {
             QTextFragment fragment = it.fragment();
             QTextCharFormat format = fragment.charFormat();
 

src/common/TempConfig.cpp

@@ -6,7 +6,7 @@
 
 TempConfig::~TempConfig()
 {
-    for (auto i = resetValues.constBegin(); i != resetValues.constEnd(); i++) {
+    for (auto i = resetValues.constBegin(); i != resetValues.constEnd(); ++i) {
         switch (i.value().type()) {
         case QVariant::String:
             Core()->setConfig(i.key(), i.value().toString());

src/common/UpdateWorker.cpp

@@ -96,7 +96,7 @@ void UpdateWorker::showUpdateDialog(bool showDontCheckForUpdatesButton)
                                              QStandardPaths::writableLocation(QStandardPaths::HomeLocation) +
                                              QDir::separator() + getRepositoryFileName(),
                                              QString("%1 (*.%1)").arg(getRepositeryExt()));
-        if (fullFileName != "") {
+        if (!fullFileName.isEmpty()) {
             QProgressDialog progressDial(tr("Downloading update..."),
                                          tr("Cancel"),
                                          0, 100);

src/core/Cutter.cpp

@@ -226,7 +226,7 @@ QString CutterCore::sdbGet(QString path, QString key)
         if (val && *val)
             return val;
     }
-    return QString("");
+    return QString();
 }
 
 bool CutterCore::sdbSet(QString path, QString key, QString val)
@@ -859,7 +859,7 @@ QString CutterCore::getDecompiledCodePDC(RVA addr)
 
 bool CutterCore::getR2DecAvailable()
 {
-    return cmd("e cmd.pdc=?").split('\n').contains(QStringLiteral("r2dec"));
+    return cmdList("e cmd.pdc=?").contains(QStringLiteral("r2dec"));
 }
 
 QString CutterCore::getDecompiledCodeR2Dec(RVA addr)
@@ -1332,13 +1332,8 @@ bool CutterCore::isGraphEmpty()
 
 void CutterCore::getOpcodes()
 {
-    QString opcodes = cmd("?O");
-    this->opcodes = opcodes.split("\n");
-    // Remove the last empty element
-    this->opcodes.removeLast();
-    QString registers = cmd("drp~[1]");
-    this->regs = registers.split("\n");
-    this->regs.removeLast();
+    this->opcodes = cmdList("?O");
+    this->regs = cmdList("drp~[1]");
 }
 
 void CutterCore::setSettings()
@@ -1587,7 +1582,7 @@ QList<SymbolDescription> CutterCore::getAllSymbols()
             SymbolDescription symbol;
             symbol.vaddr = entry->vaddr;
             symbol.name = QString("entry") + QString::number(n++);
-            symbol.bind = "";
+            symbol.bind.clear();
             symbol.type = "entry";
             ret << symbol;
         }
@@ -2333,7 +2328,7 @@ QList<SearchDescription> CutterCore::getAllSearch(QString search_for, QString sp
 
             SearchDescription exp;
 
-            exp.code = QString("");
+            exp.code.clear();
             for (const QJsonValue &value2 : searchObject[RJsonKey::opcodes].toArray()) {
                 QJsonObject gadget = value2.toObject();
                 exp.code += gadget[RJsonKey::opcode].toString() + ";  ";

src/core/Cutter.h

@@ -56,7 +56,7 @@ public:
     QString cmdRaw(const QString &str);
     QJsonDocument cmdj(const char *str);
     QJsonDocument cmdj(const QString &str) { return cmdj(str.toUtf8().constData()); }
-    QStringList cmdList(const char *str) { return cmd(str).split('\n', QString::SkipEmptyParts); }
+    QStringList cmdList(const char *str) { return cmd(str).split(QLatin1Char('\n'), QString::SkipEmptyParts); }
     QStringList cmdList(const QString &str) { return cmdList(str.toUtf8().constData()); }
     QString cmdTask(const QString &str);
     QJsonDocument cmdjTask(const QString &str);

src/dialogs/AboutDialog.cpp

@@ -92,7 +92,7 @@ void AboutDialog::on_checkForUpdatesButton_clicked()
     connect(&updateWorker, &UpdateWorker::checkComplete, &waitDialog, &QProgressDialog::cancel);
     connect(&updateWorker, &UpdateWorker::checkComplete,
     [&updateWorker](const QVersionNumber &version, const QString & error) {
-        if (error != "") {
+        if (!error.isEmpty()) {
             QMessageBox::critical(nullptr, tr("Error!"), error);
         } else {
             if (version <= UpdateWorker::currentVersionNumber()) {

src/dialogs/AttachProcDialog.cpp

@@ -119,7 +119,7 @@ ProcessBeingAnalysedProxyModel::ProcessBeingAnalysedProxyModel(ProcessModel *sou
 QString ProcessBeingAnalysedProxyModel::processPathToFilename(const QString &path) const
 {
     // removes the arguments and gets filename from the process path
-    return path.split(" ").first().split("/").last();
+    return path.section(QLatin1Char(' '), 0, 0).section(QLatin1Char('/'), -1);
 }
 
 bool ProcessBeingAnalysedProxyModel::filterAcceptsRow(int row, const QModelIndex &parent) const
@@ -329,4 +329,4 @@ void AttachProcDialog::on_procBeingAnalyzedView_doubleClicked(const QModelIndex
     Q_UNUSED(index);
 
     accept();
-}
+}

src/dialogs/EditFunctionDialog.cpp

@@ -55,11 +55,11 @@ void EditFunctionDialog::setStackSizeText(const QString &stackSize)
     ui->stackSizeLineEdit->setText(stackSize);
 }
 
-void EditFunctionDialog::setCallConList(const QStringList callConList) {
+void EditFunctionDialog::setCallConList(const QStringList &callConList) {
     ui->callConComboBox->addItems(callConList);
 }
 
-void EditFunctionDialog::setCallConSelected(const QString selected) {
+void EditFunctionDialog::setCallConSelected(const QString &selected) {
     ui->callConComboBox->setCurrentText(selected);
 }
 

src/dialogs/EditFunctionDialog.h

@@ -23,8 +23,8 @@ public:
     void setEndAddrText(const QString &endAddr);
     QString getStackSizeText();
     void setStackSizeText(const QString &stackSize);
-    void setCallConList(const QStringList callConList);
-    void setCallConSelected(const QString selected);
+    void setCallConList(const QStringList &callConList);
+    void setCallConSelected(const QString &selected);
     QString getCallConSelected();
 
 private slots:

src/dialogs/EditInstructionDialog.cpp

@@ -50,7 +50,7 @@ void EditInstructionDialog::updatePreview(const QString &input)
         result = Core()->assemble(input).trimmed();
     }
 
-    if (result.isEmpty() || result.contains("\n")) {
+    if (result.isEmpty() || result.contains(QLatin1Char('\n'))) {
         ui->instructionLabel->setText("Unknown Instruction");
     } else {
         ui->instructionLabel->setText(result);

src/dialogs/EditVariablesDialog.cpp

@@ -37,7 +37,7 @@ void EditVariablesDialog::applyFields()
 
     Core()->cmdRaw(QString("afvt %1 %2").arg(desc.name).arg(ui->typeComboBox->currentText()));
 
-    QString newName = ui->nameEdit->text().replace(" ", "_");
+    QString newName = ui->nameEdit->text().replace(QLatin1Char(' '), QLatin1Char('_'));
     if (newName != desc.name) {
         Core()->cmdRaw(QString("afvn %1 %2").arg(newName).arg(desc.name));
     }

src/dialogs/LinkTypeDialog.cpp

@@ -91,7 +91,7 @@ QString LinkTypeDialog::findLinkedType(RVA address)
 
     // Extract the given type from returned data
     // TODO: Implement "tlsj" in radare2 or some other function to directly get linked type
-    QString s = ret.split("\n").first();
+    QString s = ret.section(QLatin1Char('\n'), 0, 0);
     return s.mid(1, s.size() - 2);
 }
 

src/dialogs/NewFileDialog.cpp

@@ -267,9 +267,7 @@ bool NewFileDialog::fillRecentFilesList()
         // Get stored files
 
         // Remove all but the file name
-        const QString sep = QDir::separator();
-        const QStringList name_list = file.split(sep);
-        const QString name = name_list.last();
+        const QString name = file.section(QDir::separator(), -1);
 
         // Get file info
         QFileInfo info(file);

src/dialogs/XrefsDialog.cpp

@@ -86,17 +86,12 @@ void XrefsDialog::on_toTreeWidget_itemDoubleClicked(QTreeWidgetItem *item, int c
 
 QString XrefsDialog::normalizeAddr(const QString &addr) const
 {
-    QString r = addr;
-    QString base = addr.split("0x")[1].trimmed();
-    int len = base.length();
-    if (len < 8) {
-        int padding = 8 - len;
-        QString zero = "0";
-        QString zeroes = zero.repeated(padding);
-        r = "0x" + zeroes + base;
+    QString ret = addr;
+    if (addr.length() < 10) {
+        ret = ret.mid(3).rightJustified(8, QLatin1Char('0'));
+        ret.prepend(QLatin1Literal("0x"));
     }
-
-    return r;
+    return ret;
 }
 
 void XrefsDialog::setupPreviewFont()
@@ -196,7 +191,7 @@ QString XrefsDialog::xrefTypeString(const QString &type)
     case R_ANAL_REF_TYPE_DATA:
         return QString("Data");
     case R_ANAL_REF_TYPE_NULL:
-        return QString("");
+        return QString();
     case R_ANAL_REF_TYPE_STRING:
         return QString("String");
     default:

src/menus/DisassemblyContextMenu.cpp

@@ -290,8 +290,8 @@ void DisassemblyContextMenu::aboutToShowSlot()
 
         // Get the possible offsets using the "tas" command
         // TODO: add tasj command to radare2 and then use it here
-        QString ret = Core()->cmd("tas " + memDisp.toString());
-        for (QString val: ret.split("\n")) {
+        QStringList ret = Core()->cmdList("tas " + memDisp.toString());
+        for (const QString &val : ret) {
             if (val.isEmpty()) {
                 continue;
             }

src/plugins/PluginManager.cpp

@@ -111,8 +111,7 @@ void PluginManager::loadPythonPlugins(const QDir &directory)
         }
         QString moduleName;
         if (fileName.endsWith(".py")) {
-            QStringList l = fileName.split(".py");
-            moduleName = l[0];
+            moduleName = fileName.chopped(3);
         } else {
             moduleName = fileName;
         }

src/widgets/BreakpointWidget.cpp

@@ -191,7 +191,7 @@ void BreakpointWidget::addBreakpointDialog()
     if (dialog.exec()) {
         QString bps = dialog.getBreakpoints();
         if (!bps.isEmpty()) {
-            QStringList bpList = bps.split(' ', QString::SkipEmptyParts);
+            QStringList bpList = bps.split(QLatin1Char(' '), QString::SkipEmptyParts);
             for (const QString &bp : bpList) {
                 Core()->toggleBreakpoint(bp);
             }

src/widgets/ColorSchemePrefWidget.cpp

@@ -430,7 +430,7 @@ void ColorSchemePrefWidget::apply()
         } else {
             scheme += "ec ";
         }
-        scheme += curr.optionName + " rgb:" + curr.color.name().remove("#").toLower() + "\n";
+        scheme += curr.optionName + " rgb:" + curr.color.name().remove(QLatin1Char('#')).toLower() + "\n";
     }
     ColorSchemeFileWorker().save(scheme, Config()->getColorTheme());
     Config()->setColorTheme(Config()->getColorTheme());

src/widgets/Dashboard.cpp

@@ -56,7 +56,7 @@ void Dashboard::updateContents()
     this->ui->bitsEdit->setText(QString::number(item2["bits"].toDouble()));
 
     if (!item2["relro"].isUndefined()) {
-        QString relro = item2["relro"].toString().split(" ").at(0);
+        QString relro = item2["relro"].toString().section(QLatin1Char(' '), 0, 0);
         relro[0] = relro[0].toUpper();
         this->ui->relroEdit->setText(relro);
     }
@@ -110,11 +110,10 @@ void Dashboard::updateContents()
     ui->md5Edit->setText(md5);
     ui->sha1Edit->setText(sha1);
 
-    QString libs = Core()->cmd("il");
-    QStringList lines = libs.split("\n", QString::SkipEmptyParts);
-    if (!lines.isEmpty()) {
-        lines.removeFirst();
-        lines.removeLast();
+    QStringList libs = Core()->cmdList("il");
+    if (!libs.isEmpty()) {
+        libs.removeFirst();
+        libs.removeLast();
     }
 
     // dunno: why not label->setText(lines.join("\n")?
@@ -130,7 +129,7 @@ void Dashboard::updateContents()
         }
     }
 
-    for (const QString &lib : lines) {
+    for (const QString &lib : libs) {
         QLabel *label = new QLabel(this);
         label->setText(lib);
         label->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Preferred);

src/widgets/DebugActions.cpp

@@ -117,7 +117,7 @@ DebugActions::DebugActions(QToolBar *toolBar, MainWindow *main) :
     connect(actionStep, &QAction::triggered, Core(), &CutterCore::stepDebug);
     connect(actionStart, &QAction::triggered, [ = ]() {
         // check if file is executable before starting debug
-        QString filename = Core()->getConfig("file.path").split(" ").first();
+        QString filename = Core()->getConfig("file.path").section(QLatin1Char(' '), 0, 0);
         QFileInfo info(filename);
         if (!Core()->currentlyDebugging && !info.isExecutable()) {
             QMessageBox msgBox;

src/widgets/FunctionsWidget.cpp

@@ -181,8 +181,10 @@ QVariant FunctionModel::data(const QModelIndex &index, int role) const
 
     case Qt::DecorationRole:
         if (importAddresses->contains(function.offset) &&
-                (nested ? false : index.column() == ImportColumn))
-            return QIcon(":/img/icons/import_light.svg");
+                (nested ? false : index.column() == ImportColumn)) {
+            const static QIcon importIcon(":/img/icons/import_light.svg");
+            return importIcon;
+        }
         return QVariant();
 
     case Qt::FontRole:
@@ -225,7 +227,7 @@ QVariant FunctionModel::data(const QModelIndex &index, int role) const
             }
         }
 
-        const QStringList &summary = Core()->cmd(QString("pdsf @ %1").arg(function.offset)).split("\n", QString::SkipEmptyParts);
+        const QStringList &summary = Core()->cmdList(QString("pdsf @ %1").arg(function.offset));
 
         const QFont &fnt = Config()->getFont();
         QFontMetrics fm{ fnt };
@@ -252,7 +254,7 @@ QVariant FunctionModel::data(const QModelIndex &index, int role) const
 
         if (!highlights.isEmpty()) {
             toolTipContent += tr("<div><strong>Highlights</strong>:<br>%1</div>")
-                .arg(highlights.join("\n").toHtmlEscaped().replace("\n", "<br>"));
+                .arg(highlights.join(QLatin1Char('\n')).toHtmlEscaped().replace(QLatin1Char('\n'), "<br>"));
         }
         toolTipContent += "</div></html>";
         return toolTipContent;

src/widgets/SdbWidget.cpp

@@ -14,7 +14,7 @@ SdbWidget::SdbWidget(MainWindow *main, QAction *action) :
 {
     ui->setupUi(this);
 
-    path = "";
+    path.clear();
 
     connect(Core(), SIGNAL(refreshAll()), this, SLOT(reload()));
     reload(nullptr);
@@ -64,19 +64,19 @@ void SdbWidget::on_treeWidget_itemDoubleClicked(QTreeWidgetItem *item, int colum
 
     if (column == 0) {
         if (item->text(0) == "../") {
-            int idx = path.lastIndexOf("/");
+            int idx = path.lastIndexOf(QLatin1Char('/'));
             if (idx != -1) {
                 newpath = path.mid(0, idx);
             } else {
-                newpath = "";
+                newpath.clear();
             }
             reload(newpath);
 
-        } else if (item->text(0).indexOf("/") != -1) {
-            if (path != "") {
-                newpath = path + "/" + item->text(0).replace("/", "");
+        } else if (item->text(0).indexOf(QLatin1Char('/')) != -1) {
+            if (!path.isEmpty()) {
+                newpath = path + "/" + item->text(0).remove(QLatin1Char('/'));
             } else {
-                newpath = path + item->text(0).replace("/", "");
+                newpath = path + item->text(0).remove(QLatin1Char('/'));
             }
             // enter directory
             reload(newpath);

src/widgets/SectionsWidget.cpp

@@ -420,12 +420,12 @@ void AddrDockScene::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
 
 RVA AddrDockScene::getAddrFromPos(int posY, bool seek)
 {
-    QHash<QString, int>::const_iterator i = namePosYMap.constBegin();
+    QHash<QString, int>::const_iterator it;
     QHash<QString, RVA> addrMap = seek ? seekAddrMap : nameAddrMap;
     QHash<QString, int> addrSizeMap = seek ? seekAddrSizeMap : nameAddrSizeMap;
-    while (i != namePosYMap.constEnd()) {
-        QString name = i.key();
-        int y = i.value();
+    for (it = namePosYMap.constBegin(); it != namePosYMap.constEnd(); ++it) {
+        QString name = it.key();
+        int y = it.value();
         int h = nameHeightMap[name];
         if (posY >= y && y + h >= posY) {
             if (h == 0) {
@@ -433,7 +433,6 @@ RVA AddrDockScene::getAddrFromPos(int posY, bool seek)
             }
             return addrMap[name] + (float)addrSizeMap[name] * ((float)(posY - y) / (float)h);
         }
-        i++;
     }
     return 0;
 }
@@ -456,17 +455,19 @@ void RawAddrDock::updateDock()
     int y = 0;
     int validMinSize = getValidMinSize();
     proxyModel->sort(2, Qt::AscendingOrder);
-    for (int i = 0; i < proxyModel->rowCount(); i++) {
+    for (int i = 0; i < proxyModel->rowCount(); ++i) {
         QModelIndex idx = proxyModel->index(i, 0);
-        QString name = idx.data(SectionsModel::SectionDescriptionRole).value<SectionDescription>().name;
+        auto desc = idx.data(SectionsModel::SectionDescriptionRole).value<SectionDescription>();
 
-        RVA vaddr = idx.data(SectionsModel::SectionDescriptionRole).value<SectionDescription>().vaddr;
-        int vsize = idx.data(SectionsModel::SectionDescriptionRole).value<SectionDescription>().vsize;
+        QString name = desc.name;
+
+        RVA vaddr = desc.vaddr;
+        int vsize = desc.vsize;
         addrDockScene->seekAddrMap[name] = vaddr;
         addrDockScene->seekAddrSizeMap[name] = vsize;
 
-        RVA addr = idx.data(SectionsModel::SectionDescriptionRole).value<SectionDescription>().paddr;
-        int size = idx.data(SectionsModel::SectionDescriptionRole).value<SectionDescription>().size;
+        RVA addr = desc.paddr;
+        int size = desc.size;
         addrDockScene->nameAddrMap[name] = addr;
         addrDockScene->nameAddrSizeMap[name] = size;
 

src/widgets/VisualNavbar.cpp

@@ -297,7 +297,7 @@ QString VisualNavbar::toolTipForAddress(RVA address)
         bool first = true;
         for (const QString &section : sections) {
             if (!first) {
-                ret += "\n";
+                ret.append(QLatin1Char('\n'));
             } else {
                 first = false;
             }