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322
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1 from tree import Tree
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2 from . import ir
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3
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323
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4 """ Create a tree from ir code. """
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5
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322
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6 f_map = {} # Mapping from types to tree creation functions
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7
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8 def register(tp):
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9 """ Register a function for type tp """
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10 def reg_f(f):
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11 f_map[tp] = f
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12 return f
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13 return reg_f
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14
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15 @register(ir.Binop)
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16 def binop_to_tree(e):
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17 names = {'+':'ADDI32', '-':'SUBI32', '|':'ORI32', '<<':'SHLI32',
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356
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18 '*':'MULI32', '&':'ANDI32', '>>':'SHRI32'}
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322
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19 op = names[e.operation]
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20 return Tree(op, makeTree(e.a), makeTree(e.b))
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21
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22 @register(ir.Temp)
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23 def temp_to_tree(e):
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24 t = Tree('REGI32')
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25 t.value = e
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26 return t
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27
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28 @register(ir.Const)
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29 def const_to_tree(e):
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354
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30 if type(e.value) is bytes:
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31 t = Tree('CONSTDATA')
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32 t.value = e.value
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33 return t
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34 elif type(e.value) is int:
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35 t = Tree('CONSTI32')
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36 t.value = e.value
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37 return t
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38 else:
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39 raise Exception('{} not implemented'.format(type(e.value)))
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322
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40
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41 @register(ir.Mem)
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42 def mem_to_tree(e):
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43 return Tree('MEMI32', makeTree(e.e))
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44
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354
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45 @register(ir.Addr)
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46 def mem_to_tree(e):
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47 return Tree('ADR', makeTree(e.e))
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48
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322
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49 @register(ir.Call)
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50 def call_to_tree(e):
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323
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51 t = Tree('CALL')
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52 t.value = e
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53 return t
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322
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54
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55 def makeTree(ir_node):
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56 """ Transform an ir node into a tree usable for matching """
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57 return f_map[type(ir_node)](ir_node)
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