systemc: Report a warning if an event or object needs to be renamed.

Change-Id: I8085ba19fd7acd69d07a1e032f2fd18b6c5fed6f
Reviewed-on: https://gem5-review.googlesource.com/c/12598
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>

3 files changed, 36 insertions, 18 deletions

diff --git a/src/systemc/core/event.cc b/src/systemc/core/event.cc
index 1b43d512d..e91df1528 100644
--- a/src/systemc/core/event.cc
+++ b/src/systemc/core/event.cc
@@ -61,7 +61,8 @@ Event::Event(sc_core::sc_event *_sc_event, const char *_basename_cstr) :
     else
         parent = nullptr;
 
-    pickUniqueName(parent, _basename);
+    std::string original_name = _basename;
+    _basename = pickUniqueName(parent, _basename);
 
     if (parent) {
         Object *obj = Object::getFromScObject(parent);
@@ -70,10 +71,16 @@ Event::Event(sc_core::sc_event *_sc_event, const char *_basename_cstr) :
         topLevelEvents.emplace(topLevelEvents.end(), _sc_event);
     }
 
-    if (parent)
-        _name = std::string(parent->name()) + "." + _basename;
-    else
-        _name = _basename;
+    std::string path = parent ? (std::string(parent->name()) + ".") : "";
+
+    if (original_name != "" && _basename != original_name) {
+        std::string message = path + original_name +
+            ". Latter declaration will be renamed to " +
+            path + _basename;
+        SC_REPORT_WARNING("(W505) object already exists", message.c_str());
+    }
+
+    _name = path + _basename;
 
     allEvents.emplace(allEvents.end(), _sc_event);
 
diff --git a/src/systemc/core/object.cc b/src/systemc/core/object.cc
index 4e4a996db..ee6a08893 100644
--- a/src/systemc/core/object.cc
+++ b/src/systemc/core/object.cc
@@ -110,7 +110,8 @@ Object::Object(sc_core::sc_object *_sc_obj, const char *obj_name) :
         parent = scheduler.current();
     }
 
-    sc_gem5::pickUniqueName(parent, _basename);
+    std::string original_name = _basename;
+    _basename = sc_gem5::pickUniqueName(parent, original_name);
 
     if (parent)
         addObject(&parent->_gem5_object->children, _sc_obj);
@@ -119,12 +120,20 @@ Object::Object(sc_core::sc_object *_sc_obj, const char *obj_name) :
 
     addObject(&allObjects, _sc_obj);
 
-    _name = _basename;
     sc_core::sc_object *sc_p = parent;
+    std::string path = "";
     while (sc_p) {
-        _name = std::string(sc_p->basename()) + std::string(".") + _name;
+        path = std::string(sc_p->basename()) + std::string(".") + path;
         sc_p = sc_p->get_parent_object();
     }
+
+    if (_basename != original_name) {
+        std::string message = path + original_name +
+            ". Latter declaration will be renamed to " +
+            path + _basename;
+        SC_REPORT_WARNING("(W505) object already exists", message.c_str());
+    }
+    _name = path + _basename;
 }
 
 Object::Object(sc_core::sc_object *_sc_obj, const Object &arg) :
@@ -259,25 +268,27 @@ Object::delChildEvent(sc_core::sc_event *e)
     events.pop_back();
 }
 
-void
-Object::pickUniqueName(std::string &base)
+std::string
+Object::pickUniqueName(std::string base)
 {
     std::string seed = base;
     while (!nameIsUnique(&children, &events, base))
         base = ::sc_core::sc_gen_unique_name(seed.c_str());
+
+    return base;
 }
 
-void
-pickUniqueName(::sc_core::sc_object *parent, std::string &base)
+std::string
+pickUniqueName(::sc_core::sc_object *parent, std::string base)
 {
-    if (parent) {
-        Object::getFromScObject(parent)->pickUniqueName(base);
-        return;
-    }
+    if (parent)
+        return Object::getFromScObject(parent)->pickUniqueName(base);
 
     std::string seed = base;
     while (!nameIsUnique(&topLevelObjects, &topLevelEvents, base))
         base = ::sc_core::sc_gen_unique_name(seed.c_str());
+
+    return base;
 }
 
 
diff --git a/src/systemc/core/object.hh b/src/systemc/core/object.hh
index 6d9e8ecfd..adccde5b3 100644
--- a/src/systemc/core/object.hh
+++ b/src/systemc/core/object.hh
@@ -90,7 +90,7 @@ class Object
     EventsIt addChildEvent(sc_core::sc_event *e);
     void delChildEvent(sc_core::sc_event *e);
 
-    void pickUniqueName(std::string &name);
+    std::string pickUniqueName(std::string name);
 
   private:
     sc_core::sc_object *_sc_obj;
@@ -105,7 +105,7 @@ class Object
     sc_core::sc_attr_cltn cltn;
 };
 
-void pickUniqueName(::sc_core::sc_object *parent, std::string &name);
+std::string pickUniqueName(::sc_core::sc_object *parent, std::string name);
 
 extern Objects topLevelObjects;
 extern Objects allObjects;