class Context(object):
def __init__(self, instructions):
self.registers = Registers()
self.flags = Flags()
self.instructions = instructions
self.heap = Memory(size=40, mode=HEAP, start_address=0x0000)
self.stack = Memory(size=40, mode=STACK, start_address=0xFFFF)
self.registers.set(SP, 0xFFFF)
def run(self):
"""
initialize the context and execute the first instruction
"""
self.registers.reset()
def step(self):
"""
execute the next instruction whose address in the EIP value
:return:
"""
self.registers.tick()
self.flags.tick()
self.heap.tick()
self.stack.tick()
next_address = self.registers.get(IP).value
if next_address < len(self.instructions):
next_instruction = self.instructions[next_address]
next_instruction.execute(self)
self.registers.set(IP, next_address + 1)
return True
else:
return False
