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340
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1
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2 def val2bit(v, bits):
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3 b = []
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4 for i in range(bits):
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5 b.append(bool((1<<i) & v))
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6 #b.reverse()
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7 return b
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8
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9
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10 def bit_range(b, e):
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11 getter = lambda s: s[b:e]
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12 def setter(s, v):
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13 s[b:e] = v
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14 return property(getter, setter)
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15
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16
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17 class ThumbToken:
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18 def __init__(self):
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19 self.bit_value = 0
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20
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21 def set_bit(self, i, value):
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22 value = bool(value)
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23 assert i in range(0, 16)
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24 mask = 1 << i
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25 if value:
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26 self.bit_value |= mask
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27 else:
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28 self.bit_value &= (~mask)
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29
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30 def __getitem__(self, key):
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31 return False
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32
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33 def __setitem__(self, key, value):
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34 if type(key) is int:
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35 self.set_bit(key, value)
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36 elif type(key) is slice:
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37 assert key.step is None
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38 bits = key.stop - key.start
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39 value_bits = val2bit(value, bits)
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40 for i in range(key.start, key.stop):
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41 self.set_bit(i, value_bits[i - key.start])
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42 else:
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43 raise KeyError()
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44
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45 rd = bit_range(0, 3)
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46
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47 def encode(self):
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48 return u16(self.bit_value)
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49
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50
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51 class ArmToken:
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52 pass
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53
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