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1 from .basicblock import BasicBlock
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2 from .function import Function
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3
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4
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5 class Value:
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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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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 def __repr__(self):
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12 return '{0}'.format(self.name) # + str(self.IsUsed)
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13 @property
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14 def IsUsed(self):
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15 return len(self.used_by) > 0
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16
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17 class Variable(Value):
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18 pass
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19
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20 class Use:
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21 def __init__(self, user, val):
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22 self.user = user
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23 assert isinstance(val, Value)
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24 self.val = val
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25 self.val.used_by.append(self.user)
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26 def delete(self):
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27 self.val.used_by.remove(self.user)
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28
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29 class Instruction:
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30 """ Base class for all instructions. """
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31 def __init__(self):
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32 # live variables at this node:
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33 self.live_in = set()
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34 self.live_out = set()
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35 # What variables this instruction uses and defines:
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36 self.defs = []
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37 self.uses = []
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38 def delete(self):
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39 while self.uses:
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40 use = self.uses.pop()
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41 use.delete()
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42 def addUse(self, val):
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43 self.uses.append(Use(self, val))
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44 def addDef(self, v):
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45 self.defs.append(v)
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46 def getParent(self):
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47 return self.parent
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48 def setParent(self, p):
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49 self.parent = p
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50 Parent = property(getParent, setParent)
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51
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52 class Terminator(Instruction):
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53 @property
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54 def Targets(self):
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55 return self.getTargets()
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56 def changeTarget(self, tfrom, tto):
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57 pass
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58
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59 # Function calling:
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60 class Call(Instruction):
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61 def __init__(self, callee, arguments, result=None):
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62 super().__init__()
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63 self.callee = callee
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64 assert type(callee) is Function
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65 self.arguments = arguments
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66 for arg in arguments:
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67 assert type(arg) is Value
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68 self.addUse(arg)
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69 self.result = result
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70 if result:
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71 assert type(result) is Value
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72 self.addDef(result)
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73 def __repr__(self):
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74 if self.result:
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75 pfx = '{0} = '.format(self.result)
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76 else:
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77 pfx = ''
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78 args = ','.join([str(arg) for arg in self.arguments])
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79 return pfx + '{0}({1})'.format(self.callee.name, args)
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80
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81 class Return(Terminator):
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82 def __init__(self, value=None):
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83 super().__init__()
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84 self.value = value
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85 if value:
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86 self.addUse(value)
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87 def __repr__(self):
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88 if self.value:
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89 return 'Return {0}'.format(self.value)
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90 else:
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91 return 'Return'
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92 def getTargets(self):
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93 return []
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94
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95 class Alloc(Instruction):
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96 """ Allocates space on the stack """
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97 def __init__(self, value):
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98 super().__init__()
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99 assert isinstance(value, Value)
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100 self.value = value
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101 self.addDef(value)
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102 def __repr__(self):
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103 return '{0} = alloc'.format(self.value)
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104
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105 class ImmLoad(Instruction):
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106 def __init__(self, target, value):
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107 super().__init__()
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108 assert type(target) is Value
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109 self.target = target
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110 self.value = value
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111 self.addDef(target)
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112 def __repr__(self):
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113 return '{0} = {1}'.format(self.target, self.value)
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114
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115 # Data operations
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116 class BinaryOperator(Instruction):
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117 def __init__(self, result, operation, value1, value2):
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118 super().__init__()
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119 #print('operation is in binops:', operation in BinOps)
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120 # Check types of the two operands:
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121 assert type(value1) is Value
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122 assert type(value2) is Value
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123 self.result = result
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124 self.addDef(result)
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125 self.value1 = value1
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126 self.value2 = value2
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127 self.addUse(value1)
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128 self.addUse(value2)
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129 self.operation = operation
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130 def __repr__(self):
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131 return '{0} = {2} {1} {3}'.format(self.result, self.operation, self.value1, self.value2)
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132
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133 # Memory functions:
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134 class Load(Instruction):
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135 def __init__(self, location, value):
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136 super().__init__()
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137 assert type(value) is Value
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138 assert isinstance(location, Value), "Location must be a value"
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139 self.value = value
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140 self.addDef(value)
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141 self.location = location
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142 self.addUse(self.location)
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143 def __repr__(self):
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144 return '{} <= [{}]'.format(self.value, self.location)
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145
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146 class Store(Instruction):
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147 def __init__(self, location, value):
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148 super().__init__()
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149 assert type(value) is Value
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150 assert isinstance(location, Value), "Location must be a value"
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151 self.location = location
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152 self.value = value
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153 self.addUse(value)
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154 self.addUse(location)
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155 def __repr__(self):
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156 return '[{}] <= {}'.format(self.location, self.value)
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158 # Branching:
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159 class Branch(Terminator):
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160 def __init__(self, target):
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161 super().__init__()
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162 assert type(target) is BasicBlock
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163 self.target = target
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164 def __repr__(self):
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165 return 'BRANCH {0}'.format(self.target)
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166 def getTargets(self):
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167 return [self.target]
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168 def changeTarget(self, tfrom, tto):
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169 assert tfrom is self.target
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170 self.target = tto
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172 class ConditionalBranch(Terminator):
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173 def __init__(self, a, cond, b, lab1, lab2):
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174 super().__init__()
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175 self.a = a
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176 assert type(a) is Value
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177 self.cond = cond
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178 assert cond in ['==', '<', '>']
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179 self.b = b
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180 self.addUse(a)
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181 self.addUse(b)
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182 assert type(b) is Value
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183 assert type(lab1) is BasicBlock
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184 self.lab1 = lab1
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185 assert type(lab2) is BasicBlock
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186 self.lab2 = lab2
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187 def __repr__(self):
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188 return 'IF {0} {1} {2} THEN {3} ELSE {4}'.format(self.a, self.cond, self.b, self.lab1, self.lab2)
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189 def getTargets(self):
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190 return [self.lab1, self.lab2]
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191 def changeTarget(self, tfrom, tto):
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192 assert tfrom is self.lab1 or tfrom is self.lab2
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193 if tfrom is self.lab1:
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194 self.lab1 = tto
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195 elif tfrom is self.lab2:
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196 self.lab2 = tto
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197
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198 class PhiNode(Instruction):
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199 def __init__(self):
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200 super().__init__()
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201 self.incBB = []
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202 def addIncoming(self, bb):
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203 self.incBB.append(bb)
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204
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