SimObject.py revision 3102
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 9# notice, this list of conditions and the following disclaimer in the 10# documentation and/or other materials provided with the distribution; 11# neither the name of the copyright holders nor the names of its 12# contributors may be used to endorse or promote products derived from 13# this software without specific prior written permission. 14# 15# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 18# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 19# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 20# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 21# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 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 sys, types 31 32from util import * 33from multidict import multidict 34 35# These utility functions have to come first because they're 36# referenced in params.py... otherwise they won't be defined when we 37# import params below, and the recursive import of this file from 38# params.py will not find these names. 39def isSimObject(value): 40 return isinstance(value, SimObject) 41 42def isSimObjectClass(value): 43 return issubclass(value, SimObject) 44 45def isSimObjectSequence(value): 46 if not isinstance(value, (list, tuple)) or len(value) == 0: 47 return False 48 49 for val in value: 50 if not isNullPointer(val) and not isSimObject(val): 51 return False 52 53 return True 54 55def isSimObjectOrSequence(value): 56 return isSimObject(value) or isSimObjectSequence(value) 57 58# Have to import params up top since Param is referenced on initial 59# load (when SimObject class references Param to create a class 60# variable, the 'name' param)... 61from params import * 62# There are a few things we need that aren't in params.__all__ since 63# normal users don't need them 64from params import ParamDesc, isNullPointer, SimObjVector 65 66noDot = False 67try: 68 import pydot 69except: 70 noDot = True 71 72##################################################################### 73# 74# M5 Python Configuration Utility 75# 76# The basic idea is to write simple Python programs that build Python 77# objects corresponding to M5 SimObjects for the desired simulation 78# configuration. For now, the Python emits a .ini file that can be 79# parsed by M5. In the future, some tighter integration between M5 80# and the Python interpreter may allow bypassing the .ini file. 81# 82# Each SimObject class in M5 is represented by a Python class with the 83# same name. The Python inheritance tree mirrors the M5 C++ tree 84# (e.g., SimpleCPU derives from BaseCPU in both cases, and all 85# SimObjects inherit from a single SimObject base class). To specify 86# an instance of an M5 SimObject in a configuration, the user simply 87# instantiates the corresponding Python object. The parameters for 88# that SimObject are given by assigning to attributes of the Python 89# object, either using keyword assignment in the constructor or in 90# separate assignment statements. For example: 91# 92# cache = BaseCache(size='64KB') 93# cache.hit_latency = 3 94# cache.assoc = 8 95# 96# The magic lies in the mapping of the Python attributes for SimObject 97# classes to the actual SimObject parameter specifications. This 98# allows parameter validity checking in the Python code. Continuing 99# the example above, the statements "cache.blurfl=3" or 100# "cache.assoc='hello'" would both result in runtime errors in Python, 101# since the BaseCache object has no 'blurfl' parameter and the 'assoc' 102# parameter requires an integer, respectively. This magic is done 103# primarily by overriding the special __setattr__ method that controls 104# assignment to object attributes. 105# 106# Once a set of Python objects have been instantiated in a hierarchy, 107# calling 'instantiate(obj)' (where obj is the root of the hierarchy) 108# will generate a .ini file. 109# 110##################################################################### 111 112# dict to look up SimObjects based on path 113instanceDict = {} 114 115# The metaclass for SimObject. This class controls how new classes 116# that derive from SimObject are instantiated, and provides inherited 117# class behavior (just like a class controls how instances of that 118# class are instantiated, and provides inherited instance behavior). 119class MetaSimObject(type): 120 # Attributes that can be set only at initialization time 121 init_keywords = { 'abstract' : types.BooleanType, 122 'type' : types.StringType } 123 # Attributes that can be set any time 124 keywords = { 'check' : types.FunctionType, 125 'cxx_type' : types.StringType, 126 'cxx_predecls' : types.ListType, 127 'swig_predecls' : types.ListType } 128 129 # __new__ is called before __init__, and is where the statements 130 # in the body of the class definition get loaded into the class's 131 # __dict__. We intercept this to filter out parameter & port assignments 132 # and only allow "private" attributes to be passed to the base 133 # __new__ (starting with underscore). 134 def __new__(mcls, name, bases, dict): 135 # Copy "private" attributes, functions, and classes to the 136 # official dict. Everything else goes in _init_dict to be 137 # filtered in __init__. 138 cls_dict = {} 139 value_dict = {} 140 for key,val in dict.items(): 141 if key.startswith('_') or isinstance(val, (types.FunctionType, 142 types.TypeType)): 143 cls_dict[key] = val 144 else: 145 # must be a param/port setting 146 value_dict[key] = val 147 cls_dict['_value_dict'] = value_dict 148 return super(MetaSimObject, mcls).__new__(mcls, name, bases, cls_dict) 149 150 # subclass initialization 151 def __init__(cls, name, bases, dict): 152 # calls type.__init__()... I think that's a no-op, but leave 153 # it here just in case it's not. 154 super(MetaSimObject, cls).__init__(name, bases, dict) 155 156 # initialize required attributes 157 158 # class-only attributes 159 cls._params = multidict() # param descriptions 160 cls._ports = multidict() # port descriptions 161 162 # class or instance attributes 163 cls._values = multidict() # param values 164 cls._port_map = multidict() # port bindings 165 cls._instantiated = False # really instantiated, cloned, or subclassed 166 167 # We don't support multiple inheritance. If you want to, you 168 # must fix multidict to deal with it properly. 169 if len(bases) > 1: 170 raise TypeError, "SimObjects do not support multiple inheritance" 171 172 base = bases[0] 173 174 # Set up general inheritance via multidicts. A subclass will 175 # inherit all its settings from the base class. The only time 176 # the following is not true is when we define the SimObject 177 # class itself (in which case the multidicts have no parent). 178 if isinstance(base, MetaSimObject): 179 cls._params.parent = base._params 180 cls._ports.parent = base._ports 181 cls._values.parent = base._values 182 cls._port_map.parent = base._port_map 183 # mark base as having been subclassed 184 base._instantiated = True 185 186 # Now process the _value_dict items. They could be defining 187 # new (or overriding existing) parameters or ports, setting 188 # class keywords (e.g., 'abstract'), or setting parameter 189 # values or port bindings. The first 3 can only be set when 190 # the class is defined, so we handle them here. The others 191 # can be set later too, so just emulate that by calling 192 # setattr(). 193 for key,val in cls._value_dict.items(): 194 # param descriptions 195 if isinstance(val, ParamDesc): 196 cls._new_param(key, val) 197 198 # port objects 199 elif isinstance(val, Port): 200 cls._ports[key] = val 201 202 # init-time-only keywords 203 elif cls.init_keywords.has_key(key): 204 cls._set_keyword(key, val, cls.init_keywords[key]) 205 206 # default: use normal path (ends up in __setattr__) 207 else: 208 setattr(cls, key, val) 209 210 cls.cxx_type = cls.type + '*' 211 # A forward class declaration is sufficient since we are just 212 # declaring a pointer. 213 cls.cxx_predecls = ['class %s;' % cls.type] 214 cls.swig_predecls = cls.cxx_predecls 215 216 def _set_keyword(cls, keyword, val, kwtype): 217 if not isinstance(val, kwtype): 218 raise TypeError, 'keyword %s has bad type %s (expecting %s)' % \ 219 (keyword, type(val), kwtype) 220 if isinstance(val, types.FunctionType): 221 val = classmethod(val) 222 type.__setattr__(cls, keyword, val) 223 224 def _new_param(cls, name, pdesc): 225 # each param desc should be uniquely assigned to one variable 226 assert(not hasattr(pdesc, 'name')) 227 pdesc.name = name 228 cls._params[name] = pdesc 229 if hasattr(pdesc, 'default'): 230 setattr(cls, name, pdesc.default) 231 232 # Set attribute (called on foo.attr = value when foo is an 233 # instance of class cls). 234 def __setattr__(cls, attr, value): 235 # normal processing for private attributes 236 if attr.startswith('_'): 237 type.__setattr__(cls, attr, value) 238 return 239 240 if cls.keywords.has_key(attr): 241 cls._set_keyword(attr, value, cls.keywords[attr]) 242 return 243 244 if cls._ports.has_key(attr): 245 self._ports[attr].connect(self, attr, value) 246 return 247 248 if isSimObjectOrSequence(value) and cls._instantiated: 249 raise RuntimeError, \ 250 "cannot set SimObject parameter '%s' after\n" \ 251 " class %s has been instantiated or subclassed" \ 252 % (attr, cls.__name__) 253 254 # check for param 255 param = cls._params.get(attr, None) 256 if param: 257 try: 258 cls._values[attr] = param.convert(value) 259 except Exception, e: 260 msg = "%s\nError setting param %s.%s to %s\n" % \ 261 (e, cls.__name__, attr, value) 262 e.args = (msg, ) 263 raise 264 elif isSimObjectOrSequence(value): 265 # if RHS is a SimObject, it's an implicit child assignment 266 cls._values[attr] = value 267 else: 268 raise AttributeError, \ 269 "Class %s has no parameter \'%s\'" % (cls.__name__, attr) 270 271 def __getattr__(cls, attr): 272 if cls._values.has_key(attr): 273 return cls._values[attr] 274 275 raise AttributeError, \ 276 "object '%s' has no attribute '%s'" % (cls.__name__, attr) 277 278 def __str__(cls): 279 return cls.__name__ 280 281 def cxx_decl(cls): 282 code = "#ifndef __PARAMS__%s\n#define __PARAMS__%s\n\n" % (cls, cls) 283 284 if str(cls) != 'SimObject': 285 base = cls.__bases__[0].type 286 else: 287 base = None 288 289 # The 'dict' attribute restricts us to the params declared in 290 # the object itself, not including inherited params (which 291 # will also be inherited from the base class's param struct 292 # here). 293 params = cls._params.dict.values() 294 try: 295 ptypes = [p.ptype for p in params] 296 except: 297 print cls, p, p.ptype_str 298 print params 299 raise 300 301 # get a list of lists of predeclaration lines 302 predecls = [p.cxx_predecls() for p in params] 303 # flatten 304 predecls = reduce(lambda x,y:x+y, predecls, []) 305 # remove redundant lines 306 predecls2 = [] 307 for pd in predecls: 308 if pd not in predecls2: 309 predecls2.append(pd) 310 predecls2.sort() 311 code += "\n".join(predecls2) 312 code += "\n\n"; 313 314 if base: 315 code += '#include "params/%s.hh"\n\n' % base 316 317 # Generate declarations for locally defined enumerations. 318 enum_ptypes = [t for t in ptypes if issubclass(t, Enum)] 319 if enum_ptypes: 320 code += "\n".join([t.cxx_decl() for t in enum_ptypes]) 321 code += "\n\n" 322 323 # now generate the actual param struct 324 code += "struct %sParams" % cls 325 if base: 326 code += " : public %sParams" % base 327 code += " {\n" 328 decls = [p.cxx_decl() for p in params] 329 decls.sort() 330 code += "".join([" %s\n" % d for d in decls]) 331 code += "};\n" 332 333 # close #ifndef __PARAMS__* guard 334 code += "\n#endif\n" 335 return code 336 337 def swig_decl(cls): 338 339 code = '%%module %sParams\n' % cls 340 341 if str(cls) != 'SimObject': 342 base = cls.__bases__[0].type 343 else: 344 base = None 345 346 # The 'dict' attribute restricts us to the params declared in 347 # the object itself, not including inherited params (which 348 # will also be inherited from the base class's param struct 349 # here). 350 params = cls._params.dict.values() 351 ptypes = [p.ptype for p in params] 352 353 # get a list of lists of predeclaration lines 354 predecls = [p.swig_predecls() for p in params] 355 # flatten 356 predecls = reduce(lambda x,y:x+y, predecls, []) 357 # remove redundant lines 358 predecls2 = [] 359 for pd in predecls: 360 if pd not in predecls2: 361 predecls2.append(pd) 362 predecls2.sort() 363 code += "\n".join(predecls2) 364 code += "\n\n"; 365 366 if base: 367 code += '%%import "python/m5/swig/%sParams.i"\n\n' % base 368 369 code += '%{\n' 370 code += '#include "params/%s.hh"\n' % cls 371 code += '%}\n\n' 372 code += '%%include "params/%s.hh"\n\n' % cls 373 374 return code 375 376# The SimObject class is the root of the special hierarchy. Most of 377# the code in this class deals with the configuration hierarchy itself 378# (parent/child node relationships). 379class SimObject(object): 380 # Specify metaclass. Any class inheriting from SimObject will 381 # get this metaclass. 382 __metaclass__ = MetaSimObject 383 type = 'SimObject' 384 385 name = Param.String("Object name") 386 387 # Initialize new instance. For objects with SimObject-valued 388 # children, we need to recursively clone the classes represented 389 # by those param values as well in a consistent "deep copy"-style 390 # fashion. That is, we want to make sure that each instance is 391 # cloned only once, and that if there are multiple references to 392 # the same original object, we end up with the corresponding 393 # cloned references all pointing to the same cloned instance. 394 def __init__(self, **kwargs): 395 ancestor = kwargs.get('_ancestor') 396 memo_dict = kwargs.get('_memo') 397 if memo_dict is None: 398 # prepare to memoize any recursively instantiated objects 399 memo_dict = {} 400 elif ancestor: 401 # memoize me now to avoid problems with recursive calls 402 memo_dict[ancestor] = self 403 404 if not ancestor: 405 ancestor = self.__class__ 406 ancestor._instantiated = True 407 408 # initialize required attributes 409 self._parent = None 410 self._children = {} 411 self._ccObject = None # pointer to C++ object 412 self._instantiated = False # really "cloned" 413 414 # Inherit parameter values from class using multidict so 415 # individual value settings can be overridden. 416 self._values = multidict(ancestor._values) 417 # clone SimObject-valued parameters 418 for key,val in ancestor._values.iteritems(): 419 if isSimObject(val): 420 setattr(self, key, val(_memo=memo_dict)) 421 elif isSimObjectSequence(val) and len(val): 422 setattr(self, key, [ v(_memo=memo_dict) for v in val ]) 423 # clone port references. no need to use a multidict here 424 # since we will be creating new references for all ports. 425 self._port_map = {} 426 for key,val in ancestor._port_map.iteritems(): 427 self._port_map[key] = applyOrMap(val, 'clone', memo_dict) 428 # apply attribute assignments from keyword args, if any 429 for key,val in kwargs.iteritems(): 430 setattr(self, key, val) 431 432 # "Clone" the current instance by creating another instance of 433 # this instance's class, but that inherits its parameter values 434 # and port mappings from the current instance. If we're in a 435 # "deep copy" recursive clone, check the _memo dict to see if 436 # we've already cloned this instance. 437 def __call__(self, **kwargs): 438 memo_dict = kwargs.get('_memo') 439 if memo_dict is None: 440 # no memo_dict: must be top-level clone operation. 441 # this is only allowed at the root of a hierarchy 442 if self._parent: 443 raise RuntimeError, "attempt to clone object %s " \ 444 "not at the root of a tree (parent = %s)" \ 445 % (self, self._parent) 446 # create a new dict and use that. 447 memo_dict = {} 448 kwargs['_memo'] = memo_dict 449 elif memo_dict.has_key(self): 450 # clone already done & memoized 451 return memo_dict[self] 452 return self.__class__(_ancestor = self, **kwargs) 453 454 def __getattr__(self, attr): 455 if self._ports.has_key(attr): 456 # return reference that can be assigned to another port 457 # via __setattr__ 458 return self._ports[attr].makeRef(self, attr) 459 460 if self._values.has_key(attr): 461 return self._values[attr] 462 463 raise AttributeError, "object '%s' has no attribute '%s'" \ 464 % (self.__class__.__name__, attr) 465 466 # Set attribute (called on foo.attr = value when foo is an 467 # instance of class cls). 468 def __setattr__(self, attr, value): 469 # normal processing for private attributes 470 if attr.startswith('_'): 471 object.__setattr__(self, attr, value) 472 return 473 474 if self._ports.has_key(attr): 475 # set up port connection 476 self._ports[attr].connect(self, attr, value) 477 return 478 479 if isSimObjectOrSequence(value) and self._instantiated: 480 raise RuntimeError, \ 481 "cannot set SimObject parameter '%s' after\n" \ 482 " instance been cloned %s" % (attr, `self`) 483 484 # must be SimObject param 485 param = self._params.get(attr, None) 486 if param: 487 try: 488 value = param.convert(value) 489 except Exception, e: 490 msg = "%s\nError setting param %s.%s to %s\n" % \ 491 (e, self.__class__.__name__, attr, value) 492 e.args = (msg, ) 493 raise 494 elif isSimObjectOrSequence(value): 495 pass 496 else: 497 raise AttributeError, "Class %s has no parameter %s" \ 498 % (self.__class__.__name__, attr) 499 500 # clear out old child with this name, if any 501 self.clear_child(attr) 502 503 if isSimObject(value): 504 value.set_path(self, attr) 505 elif isSimObjectSequence(value): 506 value = SimObjVector(value) 507 [v.set_path(self, "%s%d" % (attr, i)) for i,v in enumerate(value)] 508 509 self._values[attr] = value 510 511 # this hack allows tacking a '[0]' onto parameters that may or may 512 # not be vectors, and always getting the first element (e.g. cpus) 513 def __getitem__(self, key): 514 if key == 0: 515 return self 516 raise TypeError, "Non-zero index '%s' to SimObject" % key 517 518 # clear out children with given name, even if it's a vector 519 def clear_child(self, name): 520 if not self._children.has_key(name): 521 return 522 child = self._children[name] 523 if isinstance(child, SimObjVector): 524 for i in xrange(len(child)): 525 del self._children["s%d" % (name, i)] 526 del self._children[name] 527 528 def add_child(self, name, value): 529 self._children[name] = value 530 531 def set_path(self, parent, name): 532 if not self._parent: 533 self._parent = parent 534 self._name = name 535 parent.add_child(name, self) 536 537 def path(self): 538 if not self._parent: 539 return 'root' 540 ppath = self._parent.path() 541 if ppath == 'root': 542 return self._name 543 return ppath + "." + self._name 544 545 def __str__(self): 546 return self.path() 547 548 def ini_str(self): 549 return self.path() 550 551 def find_any(self, ptype): 552 if isinstance(self, ptype): 553 return self, True 554 555 found_obj = None 556 for child in self._children.itervalues(): 557 if isinstance(child, ptype): 558 if found_obj != None and child != found_obj: 559 raise AttributeError, \ 560 'parent.any matched more than one: %s %s' % \ 561 (found_obj.path, child.path) 562 found_obj = child 563 # search param space 564 for pname,pdesc in self._params.iteritems(): 565 if issubclass(pdesc.ptype, ptype): 566 match_obj = self._values[pname] 567 if found_obj != None and found_obj != match_obj: 568 raise AttributeError, \ 569 'parent.any matched more than one: %s' % obj.path 570 found_obj = match_obj 571 return found_obj, found_obj != None 572 573 def unproxy(self, base): 574 return self 575 576 def print_ini(self): 577 print '[' + self.path() + ']' # .ini section header 578 579 instanceDict[self.path()] = self 580 581 if hasattr(self, 'type') and not isinstance(self, ParamContext): 582 print 'type=%s' % self.type 583 584 child_names = self._children.keys() 585 child_names.sort() 586 np_child_names = [c for c in child_names \ 587 if not isinstance(self._children[c], ParamContext)] 588 if len(np_child_names): 589 print 'children=%s' % ' '.join(np_child_names) 590 591 param_names = self._params.keys() 592 param_names.sort() 593 for param in param_names: 594 value = self._values.get(param, None) 595 if value != None: 596 if proxy.isproxy(value): 597 try: 598 value = value.unproxy(self) 599 except: 600 print >> sys.stderr, \ 601 "Error in unproxying param '%s' of %s" % \ 602 (param, self.path()) 603 raise 604 setattr(self, param, value) 605 print '%s=%s' % (param, self._values[param].ini_str()) 606 607 print # blank line between objects 608 609 for child in child_names: 610 self._children[child].print_ini() 611 612 # Call C++ to create C++ object corresponding to this object and 613 # (recursively) all its children 614 def createCCObject(self): 615 self.getCCObject() # force creation 616 for child in self._children.itervalues(): 617 child.createCCObject() 618 619 # Get C++ object corresponding to this object, calling C++ if 620 # necessary to construct it. Does *not* recursively create 621 # children. 622 def getCCObject(self): 623 if not self._ccObject: 624 self._ccObject = -1 # flag to catch cycles in recursion 625 self._ccObject = cc_main.createSimObject(self.path()) 626 elif self._ccObject == -1: 627 raise RuntimeError, "%s: recursive call to getCCObject()" \ 628 % self.path() 629 return self._ccObject 630 631 # Create C++ port connections corresponding to the connections in 632 # _port_map (& recursively for all children) 633 def connectPorts(self): 634 for portRef in self._port_map.itervalues(): 635 applyOrMap(portRef, 'ccConnect') 636 for child in self._children.itervalues(): 637 child.connectPorts() 638 639 def startDrain(self, drain_event, recursive): 640 count = 0 641 # ParamContexts don't serialize 642 if isinstance(self, SimObject) and not isinstance(self, ParamContext): 643 count += self._ccObject.drain(drain_event) 644 if recursive: 645 for child in self._children.itervalues(): 646 count += child.startDrain(drain_event, True) 647 return count 648 649 def resume(self): 650 if isinstance(self, SimObject) and not isinstance(self, ParamContext): 651 self._ccObject.resume() 652 for child in self._children.itervalues(): 653 child.resume() 654 655 def changeTiming(self, mode): 656 if isinstance(self, System): 657 self._ccObject.setMemoryMode(mode) 658 for child in self._children.itervalues(): 659 child.changeTiming(mode) 660 661 def takeOverFrom(self, old_cpu): 662 cpu_ptr = cc_main.convertToBaseCPUPtr(old_cpu._ccObject) 663 self._ccObject.takeOverFrom(cpu_ptr) 664 665 # generate output file for 'dot' to display as a pretty graph. 666 # this code is currently broken. 667 def outputDot(self, dot): 668 label = "{%s|" % self.path 669 if isSimObject(self.realtype): 670 label += '%s|' % self.type 671 672 if self.children: 673 # instantiate children in same order they were added for 674 # backward compatibility (else we can end up with cpu1 675 # before cpu0). 676 for c in self.children: 677 dot.add_edge(pydot.Edge(self.path,c.path, style="bold")) 678 679 simobjs = [] 680 for param in self.params: 681 try: 682 if param.value is None: 683 raise AttributeError, 'Parameter with no value' 684 685 value = param.value 686 string = param.string(value) 687 except Exception, e: 688 msg = 'exception in %s:%s\n%s' % (self.name, param.name, e) 689 e.args = (msg, ) 690 raise 691 692 if isSimObject(param.ptype) and string != "Null": 693 simobjs.append(string) 694 else: 695 label += '%s = %s\\n' % (param.name, string) 696 697 for so in simobjs: 698 label += "|<%s> %s" % (so, so) 699 dot.add_edge(pydot.Edge("%s:%s" % (self.path, so), so, 700 tailport="w")) 701 label += '}' 702 dot.add_node(pydot.Node(self.path,shape="Mrecord",label=label)) 703 704 # recursively dump out children 705 for c in self.children: 706 c.outputDot(dot) 707 708class ParamContext(SimObject): 709 pass 710 711# Function to provide to C++ so it can look up instances based on paths 712def resolveSimObject(name): 713 obj = instanceDict[name] 714 return obj.getCCObject() 715 716# __all__ defines the list of symbols that get exported when 717# 'from config import *' is invoked. Try to keep this reasonably 718# short to avoid polluting other namespaces. 719__all__ = ['SimObject', 'ParamContext'] 720 721 722# see comment on imports at end of __init__.py. 723import proxy 724import cc_main 725