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261
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1
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269
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2 """
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270
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3 Abstract assembly language instructions.
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4
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5 This is the second intermediate representation.
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6
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7 Instructions are selected and scheduled at this stage.
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269
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8 """
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261
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9
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274
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10 class Frame:
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11 """
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12 Activation record abstraction. This class contains a flattened
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13 function. Instructions are selected and scheduled at this stage.
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14 Frames differ per machine.
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15 """
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16 def __init__(self, name):
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17 self.name = name
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18 self.instructions = []
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19
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20 def __repr__(self):
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21 return 'Frame'
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22
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261
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23
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268
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24 class AbstractInstruction:
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274
|
25 """
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26 Abstract machine instruction class. This is a very simple
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27 abstraction of machine instructions.
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28 """
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268
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29 def __init__(self, assem, src=(), dst=(), jumps=()):
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30 self.assem = assem
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31 self.src = tuple(src)
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32 self.dst = tuple(dst)
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33 self.jumps = tuple(jumps)
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34
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35 def __repr__(self):
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274
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36 s = str(self.src) if self.src else ''
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37 d = str(self.dst) if self.dst else ''
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38 l = str(self.jumps) if self.jumps else ''
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39 return self.assem + s + d + l
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261
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40
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41
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