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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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17 def IsUsed(self):
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239
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18 return len(self.used_by) > 0
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19
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20 def onlyUsedInBlock(self, bb):
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21 for use in self.used_by:
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22 ins = use
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23 if ins.parent != bb:
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24 return False
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25 return True
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26
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174
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27
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205
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28 class Variable(Value):
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29 pass
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30
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239
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31
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174
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32 class Use:
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239
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33 def __init__(self, user, val):
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34 self.user = user
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35 assert isinstance(val, Value)
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36 self.val = val
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37 self.val.used_by.append(self.user)
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38
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39 def delete(self):
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40 self.val.used_by.remove(self.user)
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41
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110
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42
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155
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43 class Instruction:
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239
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44 """ Base class for all instructions. """
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45 def __init__(self):
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46 # live variables at this node:
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47 self.live_in = set()
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48 self.live_out = set()
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49 # What variables this instruction uses and defines:
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50 self.defs = []
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51 self.uses = []
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52 def delete(self):
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209
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53 while self.uses:
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54 use = self.uses.pop()
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55 use.delete()
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239
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56 while self.defs:
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57 d = self.defs.pop()
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58 d.Setter = None
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59
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60 def addUse(self, val):
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61 self.uses.append(Use(self, val))
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62
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63 def removeUse(self, val):
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64 for u in self.uses:
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65 if u.val is val:
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66 theUse = u
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67 theUse.delete()
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68 self.uses.remove(theUse)
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69
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70 def addDef(self, v):
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71 self.defs.append(v)
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72 assert v.Setter == None
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73 v.Setter = self
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74
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75 def removeDef(self, v):
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76 assert v.Setter is self
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77 v.Setter = None
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78 self.defs.remove(v)
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79
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80 def getParent(self):
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81 return self.parent
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82
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83 def setParent(self, p):
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84 self.parent = p
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85 Parent = property(getParent, setParent)
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86
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87 def replaceValue(self, old, new):
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88 raise NotImplementedError()
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89
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90 @property
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91 def Position(self):
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92 return self.parent.Instructions.index(self)
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93
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94 def check(self):
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95 # Check that the variables defined by this instruction
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96 # are only used in the same block
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97 for v in self.defs:
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98 assert v.Setter is self
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99 for ub in v.used_by:
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100 assert ub.parent == self.parent
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101
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102 # Check that variables used are defined earlier:
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103 for u in self.uses:
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104 v = u.val
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105 assert self.Position > v.Setter.Position
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106
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107
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108
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177
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109
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110 class Terminator(Instruction):
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239
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111 @property
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112 def Targets(self):
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113 return self.getTargets()
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114
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115 def changeTarget(self, tfrom, tto):
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116 pass
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117
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118
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158
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119 # Function calling:
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120 class Call(Instruction):
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175
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121 def __init__(self, callee, arguments, result=None):
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110
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122 super().__init__()
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123 self.callee = callee
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175
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124 assert type(callee) is Function
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110
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125 self.arguments = arguments
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175
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126 for arg in arguments:
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127 assert type(arg) is Value
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128 self.addUse(arg)
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129 self.result = result
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130 if result:
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131 assert type(result) is Value
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132 self.addDef(result)
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133 def __repr__(self):
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175
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134 if self.result:
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135 pfx = '{0} = '.format(self.result)
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136 else:
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137 pfx = ''
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138 args = ','.join([str(arg) for arg in self.arguments])
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139 return pfx + '{0}({1})'.format(self.callee.name, args)
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110
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140
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141 class Return(Terminator):
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142 def __init__(self, value=None):
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143 super().__init__()
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144 self.value = value
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145 if value:
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146 self.addUse(value)
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158
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147 def __repr__(self):
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174
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148 if self.value:
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230
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149 return 'ret {0}'.format(self.value)
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150 else:
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230
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151 return 'ret'
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173
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152 def getTargets(self):
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153 return []
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70
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154
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174
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155 class Alloc(Instruction):
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156 """ Allocates space on the stack """
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157 def __init__(self, value):
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158 super().__init__()
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222
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159 assert isinstance(value, Value)
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174
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160 self.value = value
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161 self.addDef(value)
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162 def __repr__(self):
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163 return '{0} = alloc'.format(self.value)
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164
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171
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165 class ImmLoad(Instruction):
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166 def __init__(self, target, value):
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167 super().__init__()
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204
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168 assert type(target) is Value
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169 self.target = target
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170 self.value = value
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171 self.addDef(target)
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172 def __repr__(self):
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239
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173 return '{} = {}'.format(self.target, self.value)
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170
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174
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175 # Data operations
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70
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176 class BinaryOperator(Instruction):
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177 def __init__(self, result, operation, value1, value2):
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178 super().__init__()
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179 #print('operation is in binops:', operation in BinOps)
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104
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180 # Check types of the two operands:
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181 assert type(value1) is Value, str(value1) + str(type(value1))
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182 assert type(value2) is Value, value2
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183 self.result = result
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184 self.addDef(result)
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104
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185 self.value1 = value1
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186 self.value2 = value2
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187 self.addUse(value1)
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188 self.addUse(value2)
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104
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189 self.operation = operation
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239
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190
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230
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191 def __repr__(self):
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192 a, b = self.value1, self.value2
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193 return '{} = {} {} {}'.format(self.result, a, self.operation, b)
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70
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194
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239
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195 def replaceValue(self, old, new):
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196 if old is self.value1:
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197 self.value1 = new
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198 elif old is self.value2:
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199 self.value2 = new
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200 elif old is self.result:
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201 self.result = new
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202 else:
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203 raise Exception()
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204 self.removeUse(old)
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205 self.addUse(new)
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206
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207 # Memory functions:
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208 class Load(Instruction):
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209 def __init__(self, location, value):
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210 super().__init__()
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211 assert type(value) is Value
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212 assert isinstance(location, Value), "Location must be a value"
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213 self.value = value
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214 self.addDef(value)
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215 self.location = location
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216 self.addUse(self.location)
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217 def __repr__(self):
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230
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218 return '{} = [{}]'.format(self.value, self.location)
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219
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220 class Store(Instruction):
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221 def __init__(self, location, value):
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222 super().__init__()
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230
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223 assert type(value) is Value, value
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224 assert isinstance(location, Value), "Location must be a value"
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225 self.location = location
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226 self.value = value
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227 self.addUse(value)
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228 self.addUse(location)
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229 def __repr__(self):
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230 return '[{}] = {}'.format(self.location, self.value)
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160
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231
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232 # Branching:
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233 class Branch(Terminator):
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219
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234 def __init__(self, target):
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235 super().__init__()
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236 assert type(target) is BasicBlock
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237 self.target = target
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219
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238 def __repr__(self):
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239 return 'BRANCH {0}'.format(self.target)
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240 def getTargets(self):
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241 return [self.target]
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242 def changeTarget(self, tfrom, tto):
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243 assert tfrom is self.target
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244 self.target = tto
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245
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177
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246 class ConditionalBranch(Terminator):
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247 def __init__(self, a, cond, b, lab1, lab2):
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248 super().__init__()
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249 self.a = a
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250 assert type(a) is Value
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251 self.cond = cond
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221
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252 assert cond in ['==', '<', '>']
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253 self.b = b
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254 self.addUse(a)
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255 self.addUse(b)
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256 assert type(b) is Value
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257 assert type(lab1) is BasicBlock
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258 self.lab1 = lab1
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259 assert type(lab2) is BasicBlock
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260 self.lab2 = lab2
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261 def __repr__(self):
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262 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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263 def getTargets(self):
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264 return [self.lab1, self.lab2]
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265 def changeTarget(self, tfrom, tto):
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266 assert tfrom is self.lab1 or tfrom is self.lab2
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267 if tfrom is self.lab1:
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268 self.lab1 = tto
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219
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269 elif tfrom is self.lab2:
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270 self.lab2 = tto
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271
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272 class PhiNode(Instruction):
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273 def __init__(self):
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274 super().__init__()
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275 self.incBB = []
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276 def addIncoming(self, bb):
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277 self.incBB.append(bb)
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278
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