diff --git a/cpu/ppc/ppcemu.h b/cpu/ppc/ppcemu.h
index 72cb444..816af8d 100644
--- a/cpu/ppc/ppcemu.h
+++ b/cpu/ppc/ppcemu.h
@@ -44,6 +44,14 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 //#define CPU_PROFILING // enable CPU profiling
 
+/** type of compiler used during execution */
+enum EXEC_MODE:uint32_t {
+    interpreter     = 0,
+    debugger        = 1,
+    threaded_int    = 2,
+    jit             = 3
+};
+
 enum endian_switch { big_end = 0, little_end = 1 };
 
 typedef void (*PPCOpcode)(void);
diff --git a/main.cpp b/main.cpp
index ee6d2cd..5b9a18a 100644
--- a/main.cpp
+++ b/main.cpp
@@ -70,16 +70,8 @@ static string appDescription = string(
 );
 
 int main(int argc, char** argv) {
-    /*
-    Execution Type:
-    0 = Realtime (Interpreter)
-    1 = Realtime (Debugger)
-    2 = Recompiler (to-do)
 
-    The rest will be decided later
-    */
-
-    uint32_t execution_mode = 0;
+    uint32_t execution_mode = interpreter;
 
     CLI::App app(appDescription);
     app.allow_windows_style_options(); /* we want Windows-style options */
@@ -206,10 +198,10 @@ int main(int argc, char** argv) {
     });
 
     switch (execution_mode) {
-    case 0:
+    case interpreter:
         ppc_exec();
         break;
-    case 1:
+    case debugger:
         enter_debugger();
         break;
     default: