3# All rights reserved. 4# 5# Redistribution and use in source and binary forms, with or without 6# modification, are permitted provided that the following conditions are 7# met: redistributions of source code must retain the above copyright 8# notice, this list of conditions and the following disclaimer; 9# redistributions in binary form must reproduce the above copyright 10# notice, this list of conditions and the following disclaimer in the 11# documentation and/or other materials provided with the distribution; 12# neither the name of the copyright holders nor the names of its 13# contributors may be used to endorse or promote products derived from 14# this software without specific prior written permission. 15# 16# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27# 28# Authors: Nathan Binkert 29 30from m5.SimObject import SimObject 31from m5.params import * 32from m5.util import fatal 33 34class Root(SimObject): 35 36 _the_instance = None 37 38 def __new__(cls, **kwargs): 39 if Root._the_instance: 40 fatal("Attempt to allocate multiple instances of Root.") 41 return None 42 43 # first call: allocate the unique instance 44 # 45 # If SimObject ever implements __new__, we may want to pass 46 # kwargs here, but for now this goes straight to 47 # object.__new__ which prints an ugly warning if you pass it 48 # args. Seems like a bad design but that's the way it is. 49 Root._the_instance = SimObject.__new__(cls) 50 return Root._the_instance 51 52 @classmethod 53 def getInstance(cls): 54 return Root._the_instance 55 56 def path(self): 57 return 'root' 58 59 type = 'Root' 60 dummy = Param.Int(0, "We don't support objects without params")
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