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annotate python/ppci/codegen/registerallocator.py @ 305:0615b5308710

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Updated docs
author Windel Bouwman
date Fri, 06 Dec 2013 13:50:38 +0100
parents 6753763d3bec
children 2c9768114877
rev   line source
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1 from .flowgraph import FlowGraph
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2 from .interferencegraph import InterferenceGraph
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3
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4 # Nifty first function:
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5 first = lambda x: next(iter(x))
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6
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7
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8 class RegisterAllocator:
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9 """
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10 Target independent register allocator.
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11
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12 Algorithm is iterated register coalescing by Appel and George.
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13
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14 Chaitin's algorithm: remove all nodes with less than K neighbours.
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15 These nodes can be colored when added back.
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16
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17 The process consists of the following steps:
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18 - build interference graph from the instruction list
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19 - remove low degree non move related nodes.
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20 - (optional) coalesc registers to remove redundant moves
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21 - (optional) spill registers
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22 - select registers
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23 """
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24
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25 def InitData(self, f):
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26 self.f = f
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27 # Register information:
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28 self.regs = set(f.regs)
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29 self.K = len(self.regs)
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30
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31 # Move related sets:
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32 self.coalescedMoves = set()
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33 self.constrainedMoves = set()
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34 self.frozenMoves = set()
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35 self.activeMoves = set()
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36 self.worklistMoves = set()
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37
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38 def Build(self):
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39 """ 1. Construct interference graph from instruction list """
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40 self.f.cfg = FlowGraph(self.f.instructions)
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41 self.f.ig = InterferenceGraph(self.f.cfg)
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42
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43 self.Node = self.f.ig.getNode
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44
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45 # Divide nodes into pre-colored and initial:
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46 pre_tmp = list(self.f.tempMap.keys())
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47 self.precolored = set(self.Node(tmp) for tmp in pre_tmp)
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48 self.workSet = set(self.f.ig.nodes - self.precolored)
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49
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50 for n in self.precolored:
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51 n.addDegree = 100 + len(self.f.ig.nodes) + self.K
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52
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53 # Initialize color map:
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54 self.color = {}
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55 for tmp, c in self.f.tempMap.items():
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56 self.color[self.Node(tmp)] = c
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57
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58 self.moves = [i for i in self.f.instructions if i.ismove]
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59 for mv in self.moves:
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60 self.Node(mv.src[0]).moves.add(mv)
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61 self.Node(mv.dst[0]).moves.add(mv)
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62
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63 def NodeMoves(self, n):
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64 return n.moves & (self.activeMoves | self.worklistMoves)
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65
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66 def MoveRelated(self, n):
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67 return bool(self.NodeMoves(n))
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68
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69 @property
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70 def SpillWorkSet(self):
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71 c = lambda n: n.Degree >= self.K
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72 return set(filter(c, self.workSet))
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73
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74 @property
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75 def FreezeWorkSet(self):
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76 c = lambda n: n.Degree < self.K and self.MoveRelated(n)
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77 return set(filter(c, self.workSet))
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78
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79 @property
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80 def SimplifyWorkSet(self):
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81 c = lambda n: n.Degree < self.K and not self.MoveRelated(n)
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82 return set(filter(c, self.workSet))
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83
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84 def makeWorkList(self):
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85 """ Divide initial nodes into worklists """
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86 self.selectStack = []
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87
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88 # Fill initial move set:
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89 for m in self.moves:
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90 self.worklistMoves.add(m)
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91
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92 def Simplify(self):
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93 """ 2. Remove nodes from the graph """
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94 n = first(self.SimplifyWorkSet)
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95 self.workSet.remove(n)
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96 self.selectStack.append(n)
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97 # Pop out of graph:
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98 self.f.ig.delNode(n)
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99
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100 def EnableMoves(self, nodes):
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101 for n in nodes:
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102 for m in self.NodeMoves(n):
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103 if m in self.activeMoves:
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104 self.activeMoves.remove(m)
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105 self.worklistMoves.add(m)
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106
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107 def Coalesc(self):
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108 """ Coalesc conservative. """
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109 m = first(self.worklistMoves)
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110 x = self.Node(m.dst[0])
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111 y = self.Node(m.src[0])
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112 u, v = (y, x) if y in self.precolored else (x, y)
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113 self.worklistMoves.remove(m)
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114 if u is v:
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115 self.coalescedMoves.add(m)
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116 elif v in self.precolored or self.f.ig.hasEdge(u, v):
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117 self.constrainedMoves.add(m)
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118 elif u not in self.precolored and self.Conservative(u, v):
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119 self.coalescedMoves.add(m)
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120 self.workSet.remove(v)
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121 self.f.ig.Combine(u, v)
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122 else:
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123 self.activeMoves.add(m)
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124
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125 def Conservative(self, u, v):
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126 """ Briggs conservative criteria for coalesc """
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127 nodes = u.Adjecent | v.Adjecent
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128 c = lambda n: n.Degree >= self.K
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129 k = len(list(filter(c, nodes)))
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130 return k < self.K
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131
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132 def Freeze(self):
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133 """ Give up coalescing on some node """
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134 u = first(self.FreezeWorkSet)
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135 self.freezeMoves(u)
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136
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137 def freezeMoves(self, u):
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138 """ Freeze moves for node u """
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139 for m in self.NodeMoves(u):
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140 if m in self.activeMoves:
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141 self.activeMoves.remove(m)
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142 else:
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143 sekf.worklistMoves.remove(m)
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144 self.frozenMoves.add(m)
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145 # Check other part of the move for still being move related:
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146 v = m.src[0] if u is m.dst[0] else m.dst[0]
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147
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148 def SelectSpill(self):
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149 # TODO
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150 pass
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151
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152 def AssignColors(self):
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153 """ Add nodes back to the graph to color it. """
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154 # Add nodes back to the graph:
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155 while self.selectStack:
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156 n = self.selectStack.pop(-1)
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157 self.f.ig.addNode(n)
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158 takenregs = set(self.color[m] for m in n.Adjecent)
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159 okColors = self.regs - takenregs
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160 if okColors:
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161 self.color[n] = first(okColors)
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162 n.color = self.color[n]
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163 else:
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164 raise NotImplementedError('Spill required here!')
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165
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166 def ApplyColors(self):
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167 # Remove coalesced moves:
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168 for mv in self.coalescedMoves:
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169 self.f.instructions.remove(mv)
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170
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171 # Use allocated registers:
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172 lookup = lambda t: self.color[self.Node(t)]
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173 for i in self.f.instructions:
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174 i.src = tuple(map(lookup, i.src))
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175 i.dst = tuple(map(lookup, i.dst))
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176
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177 def allocFrame(self, f):
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178 """ Do iterated register allocation for a single stack frame. """
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179 self.InitData(f)
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180 self.Build()
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181 self.makeWorkList()
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182 while True:
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183 if self.SimplifyWorkSet:
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184 self.Simplify()
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185 elif self.worklistMoves:
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186 self.Coalesc()
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187 elif self.FreezeWorkSet:
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188 self.Freeze()
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189 elif self.SpillWorkSet:
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190 raise NotImplementedError('Spill not implemented')
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191 else:
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192 break # Done!
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193 self.AssignColors()
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194 self.ApplyColors()
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195