refact: optimize regular expression initialization

add profiling test.

Signed-off-by: ComixHe <heyuming@deepin.org>

apps/dde-application-manager/src/main.cpp

@@ -8,6 +8,10 @@
 #include <QDir>
 #include "dbus/applicationmanager1service.h"
 #include "cgroupsidentifier.h"
+#include <chrono>
+#include <iostream>
+
+Q_LOGGING_CATEGORY(DDEAMProf, "dde.am.prof", QtInfoMsg)
 
 namespace {
 void registerComplexDbusType()
@@ -21,6 +25,7 @@ void registerComplexDbusType()
 
 int main(int argc, char *argv[])
 {
+    auto start = std::chrono::high_resolution_clock::now();
     QCoreApplication app{argc, argv};
 
     auto &bus = ApplicationManager1DBus::instance();
@@ -43,6 +48,12 @@ int main(int argc, char *argv[])
         AMService.addApplication(std::move(ret).value());
         return false;  // means to apply this function to the rest of the files
     });
-
-    return QCoreApplication::exec();
+    auto end = std::chrono::high_resolution_clock::now();
+    qCInfo(DDEAMProf) << std::chrono::duration_cast<std::chrono::milliseconds>(end - start).count() << "ms";
+    return
+#ifdef PROFILING_MODE
+        QCoreApplication::exec();
+#else
+        0;
+#endif
 }