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171
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1 from .basicblock import BasicBlock
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175
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2 from .function import Function
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171
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3
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205
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4
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171
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5 class Value:
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230
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6 """ Temporary SSA value (value that is assigned only once! """
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7 def __init__(self, name):
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239
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8 # TODO: add typing? for now only handle integers
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9 self.name = name
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10 self.used_by = []
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11 self.Setter = None
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230
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12
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13 def __repr__(self):
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14 return '{0}'.format(self.name) # + str(self.IsUsed)
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15
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16 @property
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252
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17 def UsedInBlocks(self):
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18 bbs = [i.parent for i in self.used_by + [self.Setter]]
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19 assert all(isinstance(bb, BasicBlock) for bb in bbs)
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20 return set(bbs)
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21
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22 @property
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230
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23 def IsUsed(self):
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239
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24 return len(self.used_by) > 0
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25
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252
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26 Used = IsUsed
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27
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239
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28 def onlyUsedInBlock(self, bb):
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259
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29 return all(use.Block is bb for use in self.used_by)
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239
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30
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258
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31 def lastUse(self, ins):
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32 assert ins in self.used_by
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33 return all(not ins.precedes(ub) for ub in self.used_by)
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174
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34
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261
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35 def replaceby(self, v2):
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36 for use_ins in self.used_by:
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37 use_ins.replaceValue(self, v2.value)
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38 assert not self.Used
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39
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262
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40
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205
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41 class Variable(Value):
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42 pass
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43
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239
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44
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174
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45 class Use:
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239
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46 def __init__(self, user, val):
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47 self.user = user
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48 assert isinstance(val, Value)
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49 self.val = val
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50 self.val.used_by.append(self.user)
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51
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52 def delete(self):
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53 self.val.used_by.remove(self.user)
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54
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110
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55
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155
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56 class Instruction:
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239
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57 """ Base class for all instructions. """
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58 def __init__(self):
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59 # live variables at this node:
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60 self.live_in = set()
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61 self.live_out = set()
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62 # What variables this instruction uses and defines:
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63 self.defs = []
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64 self.uses = []
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259
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65
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239
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66 def delete(self):
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209
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67 while self.uses:
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68 use = self.uses.pop()
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69 use.delete()
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239
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70 while self.defs:
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71 d = self.defs.pop()
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72 d.Setter = None
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73
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74 def addUse(self, val):
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75 self.uses.append(Use(self, val))
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76
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77 def removeUse(self, val):
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78 for u in self.uses:
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79 if u.val is val:
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80 theUse = u
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81 theUse.delete()
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82 self.uses.remove(theUse)
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83
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84 def addDef(self, v):
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85 self.defs.append(v)
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86 assert v.Setter == None
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87 v.Setter = self
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88
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89 def removeDef(self, v):
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90 assert v.Setter is self
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91 v.Setter = None
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92 self.defs.remove(v)
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93
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94 def getParent(self):
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95 return self.parent
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96
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97 def setParent(self, p):
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98 self.parent = p
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99 Parent = property(getParent, setParent)
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100
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101 def replaceValue(self, old, new):
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262
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102 # TODO: make this a generic function
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252
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103 raise NotImplementedError('{}'.format(type(self)))
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239
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104
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105 @property
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106 def Position(self):
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258
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107 return self.Block.Instructions.index(self)
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108
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109 def precedes(self, other):
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110 assert isinstance(other, Instruction)
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111 if self.Block is other.Block:
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112 return other.Position > self.Position
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259
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113 else:
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114 return self.Block.precedes(other.Block)
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115
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116 def follows(self, other):
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117 pass
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239
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118
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252
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119 @property
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120 def Function(self):
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121 return self.Block.parent
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122
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123 @property
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124 def Block(self):
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125 return self.Parent
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126
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239
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127 def check(self):
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128 # Check that the variables defined by this instruction
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129 # are only used in the same block
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130 for v in self.defs:
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131 assert v.Setter is self
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132 for ub in v.used_by:
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252
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133 assert ub.Function == self.Function
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239
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134
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135 # Check that variables used are defined earlier:
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136 for u in self.uses:
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137 v = u.val
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252
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138 #assert self.Position > v.Setter.Position
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239
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139
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140
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141
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158
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142 # Function calling:
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171
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143 class Call(Instruction):
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175
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144 def __init__(self, callee, arguments, result=None):
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110
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145 super().__init__()
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146 self.callee = callee
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175
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147 assert type(callee) is Function
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110
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148 self.arguments = arguments
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175
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149 for arg in arguments:
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150 assert type(arg) is Value
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151 self.addUse(arg)
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152 self.result = result
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153 if result:
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154 assert type(result) is Value
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155 self.addDef(result)
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261
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156
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158
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157 def __repr__(self):
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175
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158 if self.result:
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159 pfx = '{0} = '.format(self.result)
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160 else:
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161 pfx = ''
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162 args = ','.join([str(arg) for arg in self.arguments])
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163 return pfx + '{0}({1})'.format(self.callee.name, args)
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110
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164
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70
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165
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174
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166 class Alloc(Instruction):
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261
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167 """ Allocates space on the stack """
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168 def __init__(self, value):
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169 super().__init__()
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170 assert isinstance(value, Value)
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171 self.value = value
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172 self.addDef(value)
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173
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174 def __repr__(self):
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175 return '{0} = alloc'.format(self.value)
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176
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174
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177
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171
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178 class ImmLoad(Instruction):
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261
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179 def __init__(self, target, value):
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180 super().__init__()
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181 assert type(target) is Value
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182 self.target = target
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183 self.value = value
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184 self.addDef(target)
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185
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186 def __repr__(self):
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187 return '{} = {}'.format(self.target, self.value)
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170
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188
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262
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189
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171
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190 # Data operations
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70
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191 class BinaryOperator(Instruction):
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230
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192 def __init__(self, result, operation, value1, value2):
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261
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193 super().__init__()
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194 assert type(value1) is Value, str(value1) + str(type(value1))
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195 assert type(value2) is Value, value2
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196 self.result = result
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197 self.addDef(result)
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198 self.value1 = value1
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199 self.value2 = value2
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200 self.addUse(value1)
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201 self.addUse(value2)
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202 self.operation = operation
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239
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203
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230
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204 def __repr__(self):
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205 a, b = self.value1, self.value2
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206 return '{} = {} {} {}'.format(self.result, a, self.operation, b)
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70
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207
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239
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208 def replaceValue(self, old, new):
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209 if old is self.value1:
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210 self.value1 = new
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211 elif old is self.value2:
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212 self.value2 = new
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213 elif old is self.result:
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214 self.result = new
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215 else:
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216 raise Exception()
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217 self.removeUse(old)
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218 self.addUse(new)
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219
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261
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220
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170
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221 # Memory functions:
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222 class Load(Instruction):
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252
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223 def __init__(self, location, value):
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224 super().__init__()
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225 assert type(value) is Value
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226 assert isinstance(location, Value), "Location must be a value"
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227 self.value = value
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228 self.addDef(value)
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229 self.location = location
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230 self.addUse(self.location)
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231
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232 def __repr__(self):
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233 return '{} = [{}]'.format(self.value, self.location)
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157
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234
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261
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235
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171
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236 class Store(Instruction):
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252
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237 def __init__(self, location, value):
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259
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238 super().__init__()
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239 assert type(value) is Value, value
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240 assert isinstance(location, Value), "Location must be a value"
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241 self.location = location
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242 self.value = value
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243 self.addUse(value)
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244 self.addUse(location)
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245
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252
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246 def __repr__(self):
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247 return '[{}] = {}'.format(self.location, self.value)
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248
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249 def replaceValue(self, old, new):
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250 if old is self.value:
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251 self.value = new
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252 elif old is self.location:
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253 self.location = new
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254 else:
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255 raise Exception()
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256 self.removeUse(old)
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257 self.addUse(new)
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160
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258
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261
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259
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171
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260 # Branching:
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261
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261 class Terminator(Instruction):
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262 @property
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263 def Targets(self):
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264 return self.getTargets()
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265
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266 def changeTarget(self, tfrom, tto):
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267 pass
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268
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269
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177
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270 class Branch(Terminator):
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219
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271 def __init__(self, target):
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261
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272 super().__init__()
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273 assert type(target) is BasicBlock
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274 self.target = target
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275
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219
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276 def __repr__(self):
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277 return 'BRANCH {0}'.format(self.target)
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261
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278
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219
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279 def getTargets(self):
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280 return [self.target]
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261
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281
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219
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282 def changeTarget(self, tfrom, tto):
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283 assert tfrom is self.target
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284 self.target = tto
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170
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285
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261
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286
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177
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287 class ConditionalBranch(Terminator):
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288 def __init__(self, a, cond, b, lab1, lab2):
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289 super().__init__()
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290 self.a = a
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291 assert type(a) is Value
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170
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292 self.cond = cond
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221
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293 assert cond in ['==', '<', '>']
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294 self.b = b
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174
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295 self.addUse(a)
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296 self.addUse(b)
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171
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297 assert type(b) is Value
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298 assert type(lab1) is BasicBlock
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170
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299 self.lab1 = lab1
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171
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300 assert type(lab2) is BasicBlock
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170
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301 self.lab2 = lab2
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261
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302
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170
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303 def __repr__(self):
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304 return 'IF {0} {1} {2} THEN {3} ELSE {4}'.format(self.a, self.cond, self.b, self.lab1, self.lab2)
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173
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305 def getTargets(self):
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306 return [self.lab1, self.lab2]
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261
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307
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177
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308 def changeTarget(self, tfrom, tto):
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219
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309 assert tfrom is self.lab1 or tfrom is self.lab2
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177
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310 if tfrom is self.lab1:
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311 self.lab1 = tto
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219
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312 elif tfrom is self.lab2:
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177
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313 self.lab2 = tto
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170
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314
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261
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315
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316 class Return(Terminator):
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317 def __init__(self, value=None):
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318 super().__init__()
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319 self.value = value
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320 if value:
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321 self.addUse(value)
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322
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323 def __repr__(self):
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324 if self.value:
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325 return 'ret {0}'.format(self.value)
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326 else:
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327 return 'ret'
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328
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329 def getTargets(self):
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330 return []
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331
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332
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171
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333 class PhiNode(Instruction):
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252
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334 def __init__(self):
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335 super().__init__()
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336 self.incBB = []
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171
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337
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252
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338 def addIncoming(self, bb):
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339 self.incBB.append(bb)
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340
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