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#!/usr/bin/python
class Caretaker:
def __init__(self):
self.objects=dict() # Create empty objects pool
# Add registers to pool
for reg in ["MAR","MDR", "PC", "MBR", "SP","LV","CPP","TOS","OPC","H"]:
self.objects[reg]=0
self.objects["RAM"]=None
def __getitem__(self,key):
if key=="MBRU": # If we ask for unsigned
return(abs(self.objects["MBR"]))
elif key== "MBR":
if (self.objects[key]>>7)==1: # If it a negative number (2 complement)
return(-((self.objects[key]-1)^0xFF)) # transforme bin negative number to python negative number
else:
return(self.objects[key])
return(self.objects[key])
def __setitem__(self,key,value):# TODO: Do special treatment for MBR (allow only 2^8 value)
# TODO: Force data to be at most 32 bits longs (Mic-1 architecture constraint)
self.objects[key]=value
def items(self):
return(self.objects.items())
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