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