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annotate lib/CodeGen/LiveRangeCalc.h @ 0:95c75e76d11b LLVM3.4

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LLVM 3.4
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 13:56:28 +0900
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children 54457678186b
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1 //===---- LiveRangeCalc.h - Calculate live ranges ---------------*- 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 //
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10 // The LiveRangeCalc class can be used to compute live ranges from scratch. It
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11 // caches information about values in the CFG to speed up repeated operations
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12 // on the same live range. The cache can be shared by non-overlapping live
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13 // ranges. SplitKit uses that when computing the live range of split products.
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14 //
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15 // A low-level interface is available to clients that know where a variable is
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16 // live, but don't know which value it has as every point. LiveRangeCalc will
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17 // propagate values down the dominator tree, and even insert PHI-defs where
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18 // needed. SplitKit uses this faster interface when possible.
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19 //
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20 //===----------------------------------------------------------------------===//
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21
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22 #ifndef LLVM_CODEGEN_LIVERANGECALC_H
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23 #define LLVM_CODEGEN_LIVERANGECALC_H
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24
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25 #include "llvm/ADT/BitVector.h"
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26 #include "llvm/ADT/IndexedMap.h"
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27 #include "llvm/CodeGen/LiveInterval.h"
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28
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29 namespace llvm {
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30
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31 /// Forward declarations for MachineDominators.h:
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32 class MachineDominatorTree;
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33 template <class NodeT> class DomTreeNodeBase;
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34 typedef DomTreeNodeBase<MachineBasicBlock> MachineDomTreeNode;
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35
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36 class LiveRangeCalc {
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37 const MachineFunction *MF;
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38 const MachineRegisterInfo *MRI;
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39 SlotIndexes *Indexes;
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40 MachineDominatorTree *DomTree;
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41 VNInfo::Allocator *Alloc;
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42
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43 /// Seen - Bit vector of active entries in LiveOut, also used as a visited
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44 /// set by findReachingDefs. One entry per basic block, indexed by block
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45 /// number. This is kept as a separate bit vector because it can be cleared
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46 /// quickly when switching live ranges.
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47 BitVector Seen;
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48
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49 /// LiveOutPair - A value and the block that defined it. The domtree node is
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50 /// redundant, it can be computed as: MDT[Indexes.getMBBFromIndex(VNI->def)].
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51 typedef std::pair<VNInfo*, MachineDomTreeNode*> LiveOutPair;
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52
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53 /// LiveOutMap - Map basic blocks to the value leaving the block.
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54 typedef IndexedMap<LiveOutPair, MBB2NumberFunctor> LiveOutMap;
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55
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56 /// LiveOut - Map each basic block where a live range is live out to the
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57 /// live-out value and its defining block.
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58 ///
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59 /// For every basic block, MBB, one of these conditions shall be true:
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60 ///
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61 /// 1. !Seen.count(MBB->getNumber())
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62 /// Blocks without a Seen bit are ignored.
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63 /// 2. LiveOut[MBB].second.getNode() == MBB
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64 /// The live-out value is defined in MBB.
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65 /// 3. forall P in preds(MBB): LiveOut[P] == LiveOut[MBB]
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66 /// The live-out value passses through MBB. All predecessors must carry
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67 /// the same value.
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68 ///
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69 /// The domtree node may be null, it can be computed.
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70 ///
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71 /// The map can be shared by multiple live ranges as long as no two are
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72 /// live-out of the same block.
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73 LiveOutMap LiveOut;
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74
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75 /// LiveInBlock - Information about a basic block where a live range is known
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76 /// to be live-in, but the value has not yet been determined.
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77 struct LiveInBlock {
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78 // The live range set that is live-in to this block. The algorithms can
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79 // handle multiple non-overlapping live ranges simultaneously.
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80 LiveRange &LR;
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81
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82 // DomNode - Dominator tree node for the block.
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83 // Cleared when the final value has been determined and LI has been updated.
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84 MachineDomTreeNode *DomNode;
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85
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86 // Position in block where the live-in range ends, or SlotIndex() if the
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87 // range passes through the block. When the final value has been
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88 // determined, the range from the block start to Kill will be added to LI.
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89 SlotIndex Kill;
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90
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91 // Live-in value filled in by updateSSA once it is known.
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92 VNInfo *Value;
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93
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94 LiveInBlock(LiveRange &LR, MachineDomTreeNode *node, SlotIndex kill)
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95 : LR(LR), DomNode(node), Kill(kill), Value(0) {}
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96 };
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97
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98 /// LiveIn - Work list of blocks where the live-in value has yet to be
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99 /// determined. This list is typically computed by findReachingDefs() and
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100 /// used as a work list by updateSSA(). The low-level interface may also be
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101 /// used to add entries directly.
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102 SmallVector<LiveInBlock, 16> LiveIn;
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103
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104 /// Assuming that LI is live-in to KillMBB and killed at Kill, find the set
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105 /// of defs that can reach it.
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106 ///
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107 /// If only one def can reach Kill, all paths from the def to kill are added
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108 /// to LI, and the function returns true.
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109 ///
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110 /// If multiple values can reach Kill, the blocks that need LI to be live in
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111 /// are added to the LiveIn array, and the function returns false.
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112 ///
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113 /// PhysReg, when set, is used to verify live-in lists on basic blocks.
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114 bool findReachingDefs(LiveRange &LR, MachineBasicBlock &KillMBB,
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115 SlotIndex Kill, unsigned PhysReg);
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116
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117 /// updateSSA - Compute the values that will be live in to all requested
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118 /// blocks in LiveIn. Create PHI-def values as required to preserve SSA form.
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119 ///
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120 /// Every live-in block must be jointly dominated by the added live-out
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121 /// blocks. No values are read from the live ranges.
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122 void updateSSA();
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123
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124 /// Add liveness as specified in the LiveIn vector.
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125 void updateLiveIns();
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126
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127 public:
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128 LiveRangeCalc() : MF(0), MRI(0), Indexes(0), DomTree(0), Alloc(0) {}
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129
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130 //===--------------------------------------------------------------------===//
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131 // High-level interface.
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132 //===--------------------------------------------------------------------===//
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133 //
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134 // Calculate live ranges from scratch.
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135 //
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136
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137 /// reset - Prepare caches for a new set of non-overlapping live ranges. The
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138 /// caches must be reset before attempting calculations with a live range
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139 /// that may overlap a previously computed live range, and before the first
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140 /// live range in a function. If live ranges are not known to be
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141 /// non-overlapping, call reset before each.
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142 void reset(const MachineFunction *MF,
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143 SlotIndexes*,
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144 MachineDominatorTree*,
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145 VNInfo::Allocator*);
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146
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147 //===--------------------------------------------------------------------===//
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148 // Mid-level interface.
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149 //===--------------------------------------------------------------------===//
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150 //
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151 // Modify existing live ranges.
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152 //
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153
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154 /// extend - Extend the live range of LI to reach Kill.
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155 ///
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156 /// The existing values in LI must be live so they jointly dominate Kill. If
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157 /// Kill is not dominated by a single existing value, PHI-defs are inserted
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158 /// as required to preserve SSA form. If Kill is known to be dominated by a
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159 /// single existing value, Alloc may be null.
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160 ///
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161 /// PhysReg, when set, is used to verify live-in lists on basic blocks.
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162 void extend(LiveRange &LR, SlotIndex Kill, unsigned PhysReg = 0);
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163
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164 /// createDeadDefs - Create a dead def in LI for every def operand of Reg.
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165 /// Each instruction defining Reg gets a new VNInfo with a corresponding
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166 /// minimal live range.
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167 void createDeadDefs(LiveRange &LR, unsigned Reg);
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168
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169 /// createDeadDefs - Create a dead def in LI for every def of LI->reg.
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170 void createDeadDefs(LiveInterval &LI) {
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171 createDeadDefs(LI, LI.reg);
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172 }
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173
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174 /// extendToUses - Extend the live range of LI to reach all uses of Reg.
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175 ///
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176 /// All uses must be jointly dominated by existing liveness. PHI-defs are
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177 /// inserted as needed to preserve SSA form.
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178 void extendToUses(LiveRange &LR, unsigned Reg);
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179
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180 /// extendToUses - Extend the live range of LI to reach all uses of LI->reg.
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181 void extendToUses(LiveInterval &LI) {
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182 extendToUses(LI, LI.reg);
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183 }
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184
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185 //===--------------------------------------------------------------------===//
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186 // Low-level interface.
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187 //===--------------------------------------------------------------------===//
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188 //
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189 // These functions can be used to compute live ranges where the live-in and
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190 // live-out blocks are already known, but the SSA value in each block is
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191 // unknown.
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192 //
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193 // After calling reset(), add known live-out values and known live-in blocks.
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194 // Then call calculateValues() to compute the actual value that is
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195 // live-in to each block, and add liveness to the live ranges.
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196 //
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197
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198 /// setLiveOutValue - Indicate that VNI is live out from MBB. The
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199 /// calculateValues() function will not add liveness for MBB, the caller
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200 /// should take care of that.
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201 ///
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202 /// VNI may be null only if MBB is a live-through block also passed to
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203 /// addLiveInBlock().
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204 void setLiveOutValue(MachineBasicBlock *MBB, VNInfo *VNI) {
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205 Seen.set(MBB->getNumber());
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206 LiveOut[MBB] = LiveOutPair(VNI, (MachineDomTreeNode *)0);
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207 }
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208
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209 /// addLiveInBlock - Add a block with an unknown live-in value. This
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210 /// function can only be called once per basic block. Once the live-in value
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211 /// has been determined, calculateValues() will add liveness to LI.
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212 ///
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213 /// @param LR The live range that is live-in to the block.
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214 /// @param DomNode The domtree node for the block.
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215 /// @param Kill Index in block where LI is killed. If the value is
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216 /// live-through, set Kill = SLotIndex() and also call
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217 /// setLiveOutValue(MBB, 0).
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218 void addLiveInBlock(LiveRange &LR,
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219 MachineDomTreeNode *DomNode,
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diff changeset
220 SlotIndex Kill = SlotIndex()) {
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diff changeset
221 LiveIn.push_back(LiveInBlock(LR, DomNode, Kill));
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parents:
diff changeset
222 }
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223
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224 /// calculateValues - Calculate the value that will be live-in to each block
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225 /// added with addLiveInBlock. Add PHI-def values as needed to preserve SSA
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226 /// form. Add liveness to all live-in blocks up to the Kill point, or the
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227 /// whole block for live-through blocks.
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228 ///
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229 /// Every predecessor of a live-in block must have been given a value with
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230 /// setLiveOutValue, the value may be null for live-trough blocks.
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parents:
diff changeset
231 void calculateValues();
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parents:
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232 };
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233
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234 } // end namespace llvm
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235
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236 #endif