sim: Remove unused SimObject::debugObjectBreak

The static method is only present in gem5.debug builds and
it doesn't seem to do anything else than setting up a boolean
flag. I was not able to understand from git history which
was the purpose of it but I am confident it's not currently
used.

It was maybe meant to work with the --debug-break option, which
sends a SIGRAP to the current PID in order to halt a GDB
session at a specific time. Maybe the idea was to halt only
when executing a SimObject method?

Change-Id: Ic21e8f55b5e35480c2bc617c24e1352c37516e8f
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/69078
Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br>
Tested-by: kokoro <noreply+kokoro@google.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>

src/sim/sim_object.cc

@@ -60,9 +60,6 @@ SimObject::SimObject(const Params &p)
       statistics::Group(nullptr), Named(p.name),
       _params(p)
 {
-#ifdef DEBUG
-    doDebugBreak = false;
-#endif
     simObjectList.push_back(this);
     probeManager = new ProbeManager(this);
 }
@@ -148,30 +145,6 @@ SimObject::serializeAll(const std::string &cpt_dir)
    }
 }
 
-#ifdef DEBUG
-//
-// static function: flag which objects should have the debugger break
-//
-void
-SimObject::debugObjectBreak(const std::string &objs)
-{
-    SimObjectList::const_iterator i = simObjectList.begin();
-    SimObjectList::const_iterator end = simObjectList.end();
-
-    ObjectMatch match(objs);
-    for (; i != end; ++i) {
-        SimObject *obj = *i;
-        obj->doDebugBreak = match.match(obj->name());
-   }
-}
-
-void
-debugObjectBreak(const char *objs)
-{
-    SimObject::debugObjectBreak(std::string(objs));
-}
-#endif
-
 SimObject *
 SimObject::find(const char *name)
 {

src/sim/sim_object.hh

@@ -329,12 +329,6 @@ class SimObject : public EventManager, public Serializable, public Drainable,
      */
     static void serializeAll(const std::string &cpt_dir);
 
-#ifdef DEBUG
-  public:
-    bool doDebugBreak;
-    static void debugObjectBreak(const std::string &objs);
-#endif
-
     /**
      * Find the SimObject with the given name and return a pointer to
      * it.  Primarily used for interactive debugging.  Argument is
@@ -395,9 +389,6 @@ class SimObjectResolver
     virtual SimObject *resolveSimObject(const std::string &name) = 0;
 };
 
-#ifdef DEBUG
-void debugObjectBreak(const char *objs);
-#endif
 
 /**
  * To avoid circular dependencies the unserialization of SimObjects must be