configs: Add python3 workarounds in read_config

Change-Id: Ib065f41b87e5ada9535b9c2645067162aa69234b
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/19150
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Jason Lowe-Power <jason@lowepower.com>
Tested-by: kokoro <noreply+kokoro@google.com>

configs/example/read_config.py

@@ -1,4 +1,4 @@
-# Copyright (c) 2014 ARM Limited
+# Copyright (c) 2014,2019 ARM Limited
 # All rights reserved.
 #
 # The license below extends only to copyright in the software and shall
@@ -53,13 +53,17 @@ import ConfigParser
 import inspect
 import json
 import re
+import six
 import sys
 
 import m5
 import m5.ticks as ticks
 
+if six.PY3:
+    long = int
+
 sim_object_classes_by_name = {
-    cls.__name__: cls for cls in m5.objects.__dict__.itervalues()
+    cls.__name__: cls for cls in m5.objects.__dict__.values()
     if inspect.isclass(cls) and issubclass(cls, m5.objects.SimObject) }
 
 # Add some parsing functions to Param classes to handle reading in .ini
@@ -120,7 +124,7 @@ param_parsers = {
     'EthernetAddr': simple_parser()
     }
 
-for name, parser in param_parsers.iteritems():
+for name, parser in param_parsers.items():
     setattr(m5.params.__dict__[name], 'parse_ini', classmethod(parser))
 
 class PortConnection(object):
@@ -184,7 +188,7 @@ class ConfigManager(object):
 
         parsed_params = {}
 
-        for param_name, param in object_class._params.iteritems():
+        for param_name, param in object_class._params.items():
             if issubclass(param.ptype, m5.params.ParamValue):
                 if isinstance(param, m5.params.VectorParamDesc):
                     param_values = self.config.get_param_vector(object_name,
@@ -212,7 +216,7 @@ class ConfigManager(object):
         if object_name == 'Null':
             return NULL
 
-        for param_name, param in obj.__class__._params.iteritems():
+        for param_name, param in obj.__class__._params.items():
             if issubclass(param.ptype, m5.objects.SimObject):
                 if isinstance(param, m5.params.VectorParamDesc):
                     param_values = self.config.get_param_vector(object_name,
@@ -277,7 +281,7 @@ class ConfigManager(object):
             return NULL
 
         parsed_ports = []
-        for port_name, port in obj.__class__._ports.iteritems():
+        for port_name, port in obj.__class__._ports.items():
             # Assume that unnamed ports are unconnected
             peers = self.config.get_port_peers(object_name, port_name)
 
@@ -359,12 +363,12 @@ class ConfigManager(object):
         # Now fill in SimObject-valued parameters in the knowledge that
         #   this won't be interpreted as becoming the parent of objects
         #   which are already in the root hierarchy
-        for name, obj in self.objects_by_name.iteritems():
+        for name, obj in self.objects_by_name.items():
             self.fill_in_simobj_parameters(name, obj)
 
         # Gather a list of all port-to-port connections
         connections = []
-        for name, obj in self.objects_by_name.iteritems():
+        for name, obj in self.objects_by_name.items():
             connections += self.gather_port_connections(name, obj)
 
         # Find an acceptable order to bind those port connections and
@@ -457,7 +461,7 @@ class ConfigJsonFile(ConfigFile):
             for elem in node:
                 self.find_all_objects(elem)
         elif isinstance(node, dict):
-            for elem in node.itervalues():
+            for elem in node.values():
                 self.find_all_objects(elem)
 
     def load(self, config_file):
@@ -496,7 +500,7 @@ class ConfigJsonFile(ConfigFile):
         obj = self.object_dicts[object_name]
 
         children = []
-        for name, node in obj.iteritems():
+        for name, node in obj.items():
             if self.is_sim_object(node):
                 children.append((name, node['path']))
             elif isinstance(node, list) and node != [] and all([