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annotate include/llvm/Analysis/RegionIterator.h @ 83:60c9769439b8 LLVM3.7

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LLVM 3.7
author Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
date Wed, 18 Feb 2015 14:55:36 +0900
parents 54457678186b
children afa8332a0e37
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1 //===- RegionIterator.h - Iterators to iteratate over Regions ---*- C++ -*-===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 // This file defines the iterators to iterate over the elements of a Region.
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10 //===----------------------------------------------------------------------===//
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11 #ifndef LLVM_ANALYSIS_REGIONITERATOR_H
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12 #define LLVM_ANALYSIS_REGIONITERATOR_H
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13
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14 #include "llvm/ADT/GraphTraits.h"
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15 #include "llvm/ADT/PointerIntPair.h"
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16 #include "llvm/ADT/SmallPtrSet.h"
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17 #include "llvm/Analysis/RegionInfo.h"
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18 #include "llvm/IR/CFG.h"
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19 #include "llvm/Support/raw_ostream.h"
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20
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21 namespace llvm {
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22 //===----------------------------------------------------------------------===//
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23 /// @brief Hierarchical RegionNode successor iterator.
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24 ///
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25 /// This iterator iterates over all successors of a RegionNode.
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26 ///
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27 /// For a BasicBlock RegionNode it skips all BasicBlocks that are not part of
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28 /// the parent Region. Furthermore for BasicBlocks that start a subregion, a
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29 /// RegionNode representing the subregion is returned.
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30 ///
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31 /// For a subregion RegionNode there is just one successor. The RegionNode
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32 /// representing the exit of the subregion.
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33 template<class NodeType, class BlockT, class RegionT>
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34 class RNSuccIterator : public std::iterator<std::forward_iterator_tag,
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35 NodeType, ptrdiff_t> {
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36 typedef std::iterator<std::forward_iterator_tag, NodeType, ptrdiff_t> super;
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37
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38 typedef GraphTraits<BlockT*> BlockTraits;
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39 typedef typename BlockTraits::ChildIteratorType SuccIterTy;
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40
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41 // The iterator works in two modes, bb mode or region mode.
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42 enum ItMode {
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43 // In BB mode it returns all successors of this BasicBlock as its
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44 // successors.
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45 ItBB,
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46 // In region mode there is only one successor, thats the regionnode mapping
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47 // to the exit block of the regionnode
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48 ItRgBegin, // At the beginning of the regionnode successor.
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49 ItRgEnd // At the end of the regionnode successor.
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50 };
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51
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52 // Use two bit to represent the mode iterator.
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53 PointerIntPair<NodeType*, 2, ItMode> Node;
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54
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55 // The block successor iterator.
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56 SuccIterTy BItor;
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57
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58 // advanceRegionSucc - A region node has only one successor. It reaches end
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59 // once we advance it.
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60 void advanceRegionSucc() {
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61 assert(Node.getInt() == ItRgBegin && "Cannot advance region successor!");
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62 Node.setInt(ItRgEnd);
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63 }
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64
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65 NodeType* getNode() const{ return Node.getPointer(); }
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66
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67 // isRegionMode - Is the current iterator in region mode?
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68 bool isRegionMode() const { return Node.getInt() != ItBB; }
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69
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70 // Get the immediate successor. This function may return a Basic Block
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71 // RegionNode or a subregion RegionNode.
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72 NodeType* getISucc(BlockT* BB) const {
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73 NodeType *succ;
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74 succ = getNode()->getParent()->getNode(BB);
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75 assert(succ && "BB not in Region or entered subregion!");
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76 return succ;
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77 }
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78
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79 // getRegionSucc - Return the successor basic block of a SubRegion RegionNode.
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80 inline BlockT* getRegionSucc() const {
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81 assert(Node.getInt() == ItRgBegin && "Cannot get the region successor!");
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82 return getNode()->template getNodeAs<RegionT>()->getExit();
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83 }
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84
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85 // isExit - Is this the exit BB of the Region?
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86 inline bool isExit(BlockT* BB) const {
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87 return getNode()->getParent()->getExit() == BB;
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88 }
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89 public:
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90 typedef RNSuccIterator<NodeType, BlockT, RegionT> Self;
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91
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92 typedef typename super::pointer pointer;
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93
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94 /// @brief Create begin iterator of a RegionNode.
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95 inline RNSuccIterator(NodeType* node)
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96 : Node(node, node->isSubRegion() ? ItRgBegin : ItBB),
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97 BItor(BlockTraits::child_begin(node->getEntry())) {
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98
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99 // Skip the exit block
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100 if (!isRegionMode())
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101 while (BlockTraits::child_end(node->getEntry()) != BItor && isExit(*BItor))
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102 ++BItor;
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103
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104 if (isRegionMode() && isExit(getRegionSucc()))
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105 advanceRegionSucc();
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106 }
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107
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108 /// @brief Create an end iterator.
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109 inline RNSuccIterator(NodeType* node, bool)
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110 : Node(node, node->isSubRegion() ? ItRgEnd : ItBB),
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111 BItor(BlockTraits::child_end(node->getEntry())) {}
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112
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113 inline bool operator==(const Self& x) const {
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114 assert(isRegionMode() == x.isRegionMode() && "Broken iterator!");
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115 if (isRegionMode())
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116 return Node.getInt() == x.Node.getInt();
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117 else
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118 return BItor == x.BItor;
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119 }
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120
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121 inline bool operator!=(const Self& x) const { return !operator==(x); }
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122
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123 inline pointer operator*() const {
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124 BlockT *BB = isRegionMode() ? getRegionSucc() : *BItor;
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125 assert(!isExit(BB) && "Iterator out of range!");
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126 return getISucc(BB);
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127 }
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128
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129 inline Self& operator++() {
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130 if(isRegionMode()) {
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131 // The Region only has 1 successor.
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132 advanceRegionSucc();
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133 } else {
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134 // Skip the exit.
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135 do
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136 ++BItor;
77
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137 while (BItor != BlockTraits::child_end(getNode()->getEntry())
0
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138 && isExit(*BItor));
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139 }
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140 return *this;
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141 }
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142
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143 inline Self operator++(int) {
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144 Self tmp = *this;
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145 ++*this;
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146 return tmp;
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147 }
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148
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149 inline const Self &operator=(const Self &I) {
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150 if (this != &I) {
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151 assert(getNode()->getParent() == I.getNode()->getParent()
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152 && "Cannot assign iterators of two different regions!");
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153 Node = I.Node;
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154 BItor = I.BItor;
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155 }
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156 return *this;
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157 }
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158 };
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159
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160
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161 //===----------------------------------------------------------------------===//
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162 /// @brief Flat RegionNode iterator.
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163 ///
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164 /// The Flat Region iterator will iterate over all BasicBlock RegionNodes that
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165 /// are contained in the Region and its subregions. This is close to a virtual
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166 /// control flow graph of the Region.
77
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167 template<class NodeType, class BlockT, class RegionT>
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168 class RNSuccIterator<FlatIt<NodeType>, BlockT, RegionT>
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169 : public std::iterator<std::forward_iterator_tag, NodeType, ptrdiff_t> {
0
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170 typedef std::iterator<std::forward_iterator_tag, NodeType, ptrdiff_t> super;
77
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171 typedef GraphTraits<BlockT*> BlockTraits;
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172 typedef typename BlockTraits::ChildIteratorType SuccIterTy;
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173
0
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174 NodeType* Node;
77
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175 SuccIterTy Itor;
0
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diff changeset
176
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diff changeset
177 public:
77
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178 typedef RNSuccIterator<FlatIt<NodeType>, BlockT, RegionT> Self;
0
95c75e76d11b LLVM 3.4
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diff changeset
179 typedef typename super::pointer pointer;
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180
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181 /// @brief Create the iterator from a RegionNode.
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182 ///
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183 /// Note that the incoming node must be a bb node, otherwise it will trigger
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184 /// an assertion when we try to get a BasicBlock.
77
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185 inline RNSuccIterator(NodeType* node) :
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186 Node(node),
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187 Itor(BlockTraits::child_begin(node->getEntry())) {
0
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188 assert(!Node->isSubRegion()
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189 && "Subregion node not allowed in flat iterating mode!");
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190 assert(Node->getParent() && "A BB node must have a parent!");
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191
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192 // Skip the exit block of the iterating region.
77
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193 while (BlockTraits::child_end(Node->getEntry()) != Itor
0
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194 && Node->getParent()->getExit() == *Itor)
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195 ++Itor;
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196 }
77
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197
0
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198 /// @brief Create an end iterator
77
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199 inline RNSuccIterator(NodeType* node, bool) :
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200 Node(node),
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201 Itor(BlockTraits::child_end(node->getEntry())) {
0
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202 assert(!Node->isSubRegion()
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203 && "Subregion node not allowed in flat iterating mode!");
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204 }
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205
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206 inline bool operator==(const Self& x) const {
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diff changeset
207 assert(Node->getParent() == x.Node->getParent()
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208 && "Cannot compare iterators of different regions!");
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209
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210 return Itor == x.Itor && Node == x.Node;
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diff changeset
211 }
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diff changeset
212
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213 inline bool operator!=(const Self& x) const { return !operator==(x); }
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diff changeset
214
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215 inline pointer operator*() const {
77
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diff changeset
216 BlockT *BB = *Itor;
0
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diff changeset
217
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218 // Get the iterating region.
77
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219 RegionT *Parent = Node->getParent();
0
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diff changeset
220
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221 // The only case that the successor reaches out of the region is it reaches
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222 // the exit of the region.
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diff changeset
223 assert(Parent->getExit() != BB && "iterator out of range!");
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diff changeset
224
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diff changeset
225 return Parent->getBBNode(BB);
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diff changeset
226 }
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diff changeset
227
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diff changeset
228 inline Self& operator++() {
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diff changeset
229 // Skip the exit block of the iterating region.
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diff changeset
230 do
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diff changeset
231 ++Itor;
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diff changeset
232 while (Itor != succ_end(Node->getEntry())
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diff changeset
233 && Node->getParent()->getExit() == *Itor);
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diff changeset
234
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diff changeset
235 return *this;
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diff changeset
236 }
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diff changeset
237
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diff changeset
238 inline Self operator++(int) {
95c75e76d11b LLVM 3.4
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diff changeset
239 Self tmp = *this;
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diff changeset
240 ++*this;
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diff changeset
241 return tmp;
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diff changeset
242 }
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diff changeset
243
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diff changeset
244 inline const Self &operator=(const Self &I) {
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diff changeset
245 if (this != &I) {
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diff changeset
246 assert(Node->getParent() == I.Node->getParent()
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247 && "Cannot assign iterators to two different regions!");
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248 Node = I.Node;
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diff changeset
249 Itor = I.Itor;
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diff changeset
250 }
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diff changeset
251 return *this;
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diff changeset
252 }
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diff changeset
253 };
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diff changeset
254
77
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diff changeset
255 template<class NodeType, class BlockT, class RegionT>
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diff changeset
256 inline RNSuccIterator<NodeType, BlockT, RegionT> succ_begin(NodeType* Node) {
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257 return RNSuccIterator<NodeType, BlockT, RegionT>(Node);
0
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258 }
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diff changeset
259
77
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diff changeset
260 template<class NodeType, class BlockT, class RegionT>
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diff changeset
261 inline RNSuccIterator<NodeType, BlockT, RegionT> succ_end(NodeType* Node) {
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diff changeset
262 return RNSuccIterator<NodeType, BlockT, RegionT>(Node, true);
0
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263 }
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264
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265 //===--------------------------------------------------------------------===//
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266 // RegionNode GraphTraits specialization so the bbs in the region can be
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267 // iterate by generic graph iterators.
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268 //
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269 // NodeT can either be region node or const region node, otherwise child_begin
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270 // and child_end fail.
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271
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272 #define RegionNodeGraphTraits(NodeT, BlockT, RegionT) \
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273 template<> struct GraphTraits<NodeT*> { \
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274 typedef NodeT NodeType; \
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275 typedef RNSuccIterator<NodeType, BlockT, RegionT> ChildIteratorType; \
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276 static NodeType *getEntryNode(NodeType* N) { return N; } \
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277 static inline ChildIteratorType child_begin(NodeType *N) { \
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278 return RNSuccIterator<NodeType, BlockT, RegionT>(N); \
0
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279 } \
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280 static inline ChildIteratorType child_end(NodeType *N) { \
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281 return RNSuccIterator<NodeType, BlockT, RegionT>(N, true); \
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282 } \
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283 }; \
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284 template<> struct GraphTraits<FlatIt<NodeT*>> { \
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285 typedef NodeT NodeType; \
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286 typedef RNSuccIterator<FlatIt<NodeT>, BlockT, RegionT > ChildIteratorType; \
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287 static NodeType *getEntryNode(NodeType* N) { return N; } \
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288 static inline ChildIteratorType child_begin(NodeType *N) { \
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289 return RNSuccIterator<FlatIt<NodeType>, BlockT, RegionT>(N); \
0
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290 } \
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291 static inline ChildIteratorType child_end(NodeType *N) { \
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292 return RNSuccIterator<FlatIt<NodeType>, BlockT, RegionT>(N, true); \
0
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293 } \
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294 }
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295
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296 #define RegionGraphTraits(RegionT, NodeT) \
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297 template<> struct GraphTraits<RegionT*> \
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298 : public GraphTraits<NodeT*> { \
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299 typedef df_iterator<NodeType*> nodes_iterator; \
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300 static NodeType *getEntryNode(RegionT* R) { \
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301 return R->getNode(R->getEntry()); \
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302 } \
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303 static nodes_iterator nodes_begin(RegionT* R) { \
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304 return nodes_iterator::begin(getEntryNode(R)); \
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305 } \
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306 static nodes_iterator nodes_end(RegionT* R) { \
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307 return nodes_iterator::end(getEntryNode(R)); \
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308 } \
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309 }; \
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310 template<> struct GraphTraits<FlatIt<RegionT*> > \
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311 : public GraphTraits<FlatIt<NodeT*> > { \
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312 typedef df_iterator<NodeType*, SmallPtrSet<NodeType*, 8>, false, \
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313 GraphTraits<FlatIt<NodeType*> > > nodes_iterator; \
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314 static NodeType *getEntryNode(RegionT* R) { \
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315 return R->getBBNode(R->getEntry()); \
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316 } \
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317 static nodes_iterator nodes_begin(RegionT* R) { \
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318 return nodes_iterator::begin(getEntryNode(R)); \
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319 } \
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320 static nodes_iterator nodes_end(RegionT* R) { \
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321 return nodes_iterator::end(getEntryNode(R)); \
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322 } \
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323 }
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324
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325 RegionNodeGraphTraits(RegionNode, BasicBlock, Region);
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326 RegionNodeGraphTraits(const RegionNode, BasicBlock, Region);
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327
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328 RegionGraphTraits(Region, RegionNode);
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329 RegionGraphTraits(const Region, const RegionNode);
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330
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331 template <> struct GraphTraits<RegionInfo*>
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332 : public GraphTraits<FlatIt<RegionNode*> > {
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333 typedef df_iterator<NodeType*, SmallPtrSet<NodeType*, 8>, false,
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334 GraphTraits<FlatIt<NodeType*> > > nodes_iterator;
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335
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336 static NodeType *getEntryNode(RegionInfo *RI) {
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337 return GraphTraits<FlatIt<Region*> >::getEntryNode(RI->getTopLevelRegion());
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338 }
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339 static nodes_iterator nodes_begin(RegionInfo* RI) {
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340 return nodes_iterator::begin(getEntryNode(RI));
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341 }
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342 static nodes_iterator nodes_end(RegionInfo *RI) {
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343 return nodes_iterator::end(getEntryNode(RI));
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344 }
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345 };
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346
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347 template <> struct GraphTraits<RegionInfoPass*>
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348 : public GraphTraits<RegionInfo *> {
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349 typedef df_iterator<NodeType*, SmallPtrSet<NodeType*, 8>, false,
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350 GraphTraits<FlatIt<NodeType*> > > nodes_iterator;
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351
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352 static NodeType *getEntryNode(RegionInfoPass *RI) {
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353 return GraphTraits<RegionInfo*>::getEntryNode(&RI->getRegionInfo());
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354 }
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355 static nodes_iterator nodes_begin(RegionInfoPass* RI) {
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356 return GraphTraits<RegionInfo*>::nodes_begin(&RI->getRegionInfo());
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357 }
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358 static nodes_iterator nodes_end(RegionInfoPass *RI) {
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359 return GraphTraits<RegionInfo*>::nodes_end(&RI->getRegionInfo());
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360 }
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361 };
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362
0
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363 } // End namespace llvm
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364
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365 #endif