1# Copyright (c) 2004-2006 The Regents of The University of Michigan
2# All rights reserved.
3#
4# Redistribution and use in source and binary forms, with or without
5# modification, are permitted provided that the following conditions are
6# met: redistributions of source code must retain the above copyright
7# notice, this list of conditions and the following disclaimer;
8# redistributions in binary form must reproduce the above copyright

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24# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
25# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26#
27# Authors: Steve Reinhardt
28# Nathan Binkert
29
30import math
31import sys
32import types
33
34try:
35 import pydot
36except:
37 pydot = False
38
39import m5
40from m5.util import *

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97instanceDict = {}
98
99# The metaclass for SimObject. This class controls how new classes
100# that derive from SimObject are instantiated, and provides inherited
101# class behavior (just like a class controls how instances of that
102# class are instantiated, and provides inherited instance behavior).
103class MetaSimObject(type):
104 # Attributes that can be set only at initialization time
105 init_keywords = { 'abstract' : types.BooleanType,
106 'cxx_class' : types.StringType,
107 'cxx_type' : types.StringType,
108 'cxx_predecls' : types.ListType,
109 'swig_objdecls' : types.ListType,
110 'swig_predecls' : types.ListType,
111 'type' : types.StringType }
112 # Attributes that can be set any time
113 keywords = { 'check' : types.FunctionType }
114
115 # __new__ is called before __init__, and is where the statements
116 # in the body of the class definition get loaded into the class's
117 # __dict__. We intercept this to filter out parameter & port assignments
118 # and only allow "private" attributes to be passed to the base
119 # __new__ (starting with underscore).
120 def __new__(mcls, name, bases, dict):
121 assert name not in allClasses, "SimObject %s already present" % name
122
123 # Copy "private" attributes, functions, and classes to the
124 # official dict. Everything else goes in _init_dict to be
125 # filtered in __init__.
126 cls_dict = {}
127 value_dict = {}
128 for key,val in dict.items():
129 if key.startswith('_') or isinstance(val, (types.FunctionType,
130 types.TypeType)):
131 cls_dict[key] = val
132 else:
133 # must be a param/port setting
134 value_dict[key] = val
135 if 'abstract' not in value_dict:
136 value_dict['abstract'] = False
137 cls_dict['_value_dict'] = value_dict
138 cls = super(MetaSimObject, mcls).__new__(mcls, name, bases, cls_dict)

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228 # default: use normal path (ends up in __setattr__)
229 else:
230 setattr(cls, key, val)
231
232 def _set_keyword(cls, keyword, val, kwtype):
233 if not isinstance(val, kwtype):
234 raise TypeError, 'keyword %s has bad type %s (expecting %s)' % \
235 (keyword, type(val), kwtype)
236 if isinstance(val, types.FunctionType):
237 val = classmethod(val)
238 type.__setattr__(cls, keyword, val)
239
240 def _new_param(cls, name, pdesc):
241 # each param desc should be uniquely assigned to one variable
242 assert(not hasattr(pdesc, 'name'))
243 pdesc.name = name
244 cls._params[name] = pdesc

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