Config: Use the attribute naming and include ports in JSON

This patch changes the organisation of the JSON output slightly to
make it easier to traverse and use the files. Most importantly, the
hierarchical dictionaries now use keys that correspond to the
attribute names also in the case of VectorParams (used to be
e.f. "cpu0 cpu1"). It also adds the name and the path to each
SimObject directory entry. Before this patch, to get cpu0, you would
have to query dict['system']['cpu0 cpu1'][0] and this could be a dict
with 'cpu0' : { cpu parameters }. Now you use dict['system']['cpu'][0]
and get { cpu parameters } (where one is "name" : "cpu0").

Additionally this patch includes more verbose information about the
ports, specifying their role, and using a JSON array rather than a
concatenated string for the peer.

src/python/m5/SimObject.py

@@ -931,6 +931,10 @@ class SimObject(object):
             d.type = self.type
         if hasattr(self, 'cxx_class'):
             d.cxx_class = self.cxx_class
+        # Add the name and path of this object to be able to link to
+        # the stats
+        d.name = self.get_name()
+        d.path = self.path()
 
         for param in sorted(self._params.keys()):
             value = self._values.get(param)
@@ -949,15 +953,18 @@ class SimObject(object):
                     pass
 
         for n in sorted(self._children.keys()):
-            d[self._children[n].get_name()] =  self._children[n].get_config_as_dict()
+            child = self._children[n]
+            # Use the name of the attribute (and not get_name()) as
+            # the key in the JSON dictionary to capture the hierarchy
+            # in the Python code that assembled this system
+            d[n] = child.get_config_as_dict()
 
         for port_name in sorted(self._ports.keys()):
             port = self._port_refs.get(port_name, None)
             if port != None:
-                # Might want to actually make this reference the object
-                # in the future, although execing the string problem would
-                # get some of the way there
-                d[port_name] = port.ini_str()
+                # Represent each port with a dictionary containing the
+                # prominent attributes
+                d[port_name] = port.get_config_as_dict()
 
         return d