sim: fail on implicit creation of orphans via ports

Orphan SimObjects (not in the config hierarchy) could get
created implicitly if they have a port connection to a SimObject
that is in the hierarchy.  This means that there are objects on
the C++ SimObject list (created via the C++ SimObject
constructor call) that are unknown to Python and will get
skipped if we walk the hierarchy from the Python side (as we are
about to do).  This patch detects this situation and prints an
error message.

Also fix the rubytester config script which happened to rely on
this behavior.

src/python/m5/SimObject.py

@@ -761,13 +761,16 @@ class SimObject(object):
     # children.
     def getCCObject(self):
         if not self._ccObject:
-            # Cycles in the configuration heirarchy are not supported. This
+            # Make sure this object is in the configuration hierarchy
+            if not self._parent and not isRoot(self):
+                raise RuntimeError, "Attempt to instantiate orphan node"
+            # Cycles in the configuration hierarchy are not supported. This
             # will catch the resulting recursion and stop.
             self._ccObject = -1
             params = self.getCCParams()
             self._ccObject = params.create()
         elif self._ccObject == -1:
-            raise RuntimeError, "%s: Cycle found in configuration heirarchy." \
+            raise RuntimeError, "%s: Cycle found in configuration hierarchy." \
                   % self.path()
         return self._ccObject
 
@@ -890,6 +893,10 @@ def isSimObjectSequence(value):
 def isSimObjectOrSequence(value):
     return isSimObject(value) or isSimObjectSequence(value)
 
+def isRoot(obj):
+    from m5.objects import Root
+    return obj and obj is Root.getInstance()
+
 baseClasses = allClasses.copy()
 baseInstances = instanceDict.copy()
 

src/python/m5/params.py

@@ -1049,8 +1049,14 @@ class PortRef(object):
         peer = self.peer
         if not self.peer: # nothing to connect to
             return
-        connectPorts(self.simobj.getCCObject(), self.name, self.index,
-                     peer.simobj.getCCObject(), peer.name, peer.index)
+        try:
+            connectPorts(self.simobj.getCCObject(), self.name, self.index,
+                         peer.simobj.getCCObject(), peer.name, peer.index)
+        except:
+            print "Error connecting port %s.%s to %s.%s" % \
+                  (self.simobj.path(), self.name,
+                   peer.simobj.path(), peer.name)
+            raise
         self.ccConnected = True
         peer.ccConnected = True
 

tests/configs/rubytest-ruby.py

@@ -70,7 +70,7 @@ execfile(os.path.join(config_root, "configs/common", "Options.py"))
 #
 tester = RubyTester(checks_to_complete = 100, wakeup_frequency = 10)
 
-system = System(physmem = PhysicalMemory())
+system = System(tester = tester, physmem = PhysicalMemory())
 
 system.ruby = Ruby.create_system(options, system.physmem)