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annotate lib/IR/Dominators.cpp @ 116:a609e5c42ecc

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change from CGF to this
author mir3636
date Mon, 08 Aug 2016 19:47:00 +0900
parents 7d135dc70f03
children 1172e4bd9c6f
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1 //===- Dominators.cpp - Dominator Calculation -----------------------------===//
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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 // This file implements simple dominator construction algorithms for finding
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11 // forward dominators. Postdominators are available in libanalysis, but are not
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12 // included in libvmcore, because it's not needed. Forward dominators are
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13 // needed to support the Verifier pass.
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14 //
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15 //===----------------------------------------------------------------------===//
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16
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17 #include "llvm/IR/Dominators.h"
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18 #include "llvm/ADT/DepthFirstIterator.h"
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19 #include "llvm/ADT/SmallPtrSet.h"
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20 #include "llvm/ADT/SmallVector.h"
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21 #include "llvm/IR/CFG.h"
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22 #include "llvm/IR/Instructions.h"
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23 #include "llvm/IR/PassManager.h"
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24 #include "llvm/Support/CommandLine.h"
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25 #include "llvm/Support/Compiler.h"
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26 #include "llvm/Support/Debug.h"
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27 #include "llvm/Support/GenericDomTreeConstruction.h"
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28 #include "llvm/Support/raw_ostream.h"
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29 #include <algorithm>
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30 using namespace llvm;
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31
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32 // Always verify dominfo if expensive checking is enabled.
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33 #ifdef XDEBUG
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34 static bool VerifyDomInfo = true;
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35 #else
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36 static bool VerifyDomInfo = false;
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37 #endif
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38 static cl::opt<bool,true>
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39 VerifyDomInfoX("verify-dom-info", cl::location(VerifyDomInfo),
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40 cl::desc("Verify dominator info (time consuming)"));
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41
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42 bool BasicBlockEdge::isSingleEdge() const {
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43 const TerminatorInst *TI = Start->getTerminator();
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44 unsigned NumEdgesToEnd = 0;
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45 for (unsigned int i = 0, n = TI->getNumSuccessors(); i < n; ++i) {
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46 if (TI->getSuccessor(i) == End)
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47 ++NumEdgesToEnd;
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48 if (NumEdgesToEnd >= 2)
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49 return false;
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50 }
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51 assert(NumEdgesToEnd == 1);
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52 return true;
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53 }
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54
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55 //===----------------------------------------------------------------------===//
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56 // DominatorTree Implementation
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57 //===----------------------------------------------------------------------===//
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58 //
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59 // Provide public access to DominatorTree information. Implementation details
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60 // can be found in Dominators.h, GenericDomTree.h, and
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61 // GenericDomTreeConstruction.h.
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62 //
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63 //===----------------------------------------------------------------------===//
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64
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65 template class llvm::DomTreeNodeBase<BasicBlock>;
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66 template class llvm::DominatorTreeBase<BasicBlock>;
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67
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68 template void llvm::Calculate<Function, BasicBlock *>(
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69 DominatorTreeBase<GraphTraits<BasicBlock *>::NodeType> &DT, Function &F);
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70 template void llvm::Calculate<Function, Inverse<BasicBlock *>>(
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71 DominatorTreeBase<GraphTraits<Inverse<BasicBlock *>>::NodeType> &DT,
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72 Function &F);
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73
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74 // dominates - Return true if Def dominates a use in User. This performs
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75 // the special checks necessary if Def and User are in the same basic block.
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76 // Note that Def doesn't dominate a use in Def itself!
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77 bool DominatorTree::dominates(const Instruction *Def,
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78 const Instruction *User) const {
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79 const BasicBlock *UseBB = User->getParent();
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80 const BasicBlock *DefBB = Def->getParent();
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81
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82 // Any unreachable use is dominated, even if Def == User.
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83 if (!isReachableFromEntry(UseBB))
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84 return true;
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85
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86 // Unreachable definitions don't dominate anything.
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87 if (!isReachableFromEntry(DefBB))
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88 return false;
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89
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90 // An instruction doesn't dominate a use in itself.
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91 if (Def == User)
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92 return false;
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93
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94 // The value defined by an invoke dominates an instruction only if it
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95 // dominates every instruction in UseBB.
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96 // A PHI is dominated only if the instruction dominates every possible use in
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97 // the UseBB.
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98 if (isa<InvokeInst>(Def) || isa<PHINode>(User))
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99 return dominates(Def, UseBB);
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100
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101 if (DefBB != UseBB)
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102 return dominates(DefBB, UseBB);
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103
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104 // Loop through the basic block until we find Def or User.
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105 BasicBlock::const_iterator I = DefBB->begin();
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106 for (; &*I != Def && &*I != User; ++I)
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107 /*empty*/;
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108
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109 return &*I == Def;
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110 }
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111
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112 // true if Def would dominate a use in any instruction in UseBB.
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113 // note that dominates(Def, Def->getParent()) is false.
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114 bool DominatorTree::dominates(const Instruction *Def,
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115 const BasicBlock *UseBB) const {
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116 const BasicBlock *DefBB = Def->getParent();
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117
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118 // Any unreachable use is dominated, even if DefBB == UseBB.
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119 if (!isReachableFromEntry(UseBB))
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120 return true;
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121
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122 // Unreachable definitions don't dominate anything.
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123 if (!isReachableFromEntry(DefBB))
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124 return false;
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125
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126 if (DefBB == UseBB)
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127 return false;
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128
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129 // Invoke results are only usable in the normal destination, not in the
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130 // exceptional destination.
95
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
131 if (const auto *II = dyn_cast<InvokeInst>(Def)) {
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
132 BasicBlock *NormalDest = II->getNormalDest();
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
133 BasicBlockEdge E(DefBB, NormalDest);
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
134 return dominates(E, UseBB);
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
135 }
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
136
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
137 return dominates(DefBB, UseBB);
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
138 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
139
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
140 bool DominatorTree::dominates(const BasicBlockEdge &BBE,
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
141 const BasicBlock *UseBB) const {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
142 // Assert that we have a single edge. We could handle them by simply
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
143 // returning false, but since isSingleEdge is linear on the number of
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
144 // edges, the callers can normally handle them more efficiently.
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
145 assert(BBE.isSingleEdge() &&
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
146 "This function is not efficient in handling multiple edges");
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
147
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
148 // If the BB the edge ends in doesn't dominate the use BB, then the
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
149 // edge also doesn't.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
150 const BasicBlock *Start = BBE.getStart();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
151 const BasicBlock *End = BBE.getEnd();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
152 if (!dominates(End, UseBB))
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
153 return false;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
154
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
155 // Simple case: if the end BB has a single predecessor, the fact that it
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
156 // dominates the use block implies that the edge also does.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
157 if (End->getSinglePredecessor())
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
158 return true;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
159
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
160 // The normal edge from the invoke is critical. Conceptually, what we would
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
161 // like to do is split it and check if the new block dominates the use.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
162 // With X being the new block, the graph would look like:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
163 //
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
164 // DefBB
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
165 // /\ . .
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
166 // / \ . .
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
167 // / \ . .
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
168 // / \ | |
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
169 // A X B C
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
170 // | \ | /
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
171 // . \|/
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
172 // . NormalDest
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
173 // .
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
174 //
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
175 // Given the definition of dominance, NormalDest is dominated by X iff X
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
176 // dominates all of NormalDest's predecessors (X, B, C in the example). X
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
177 // trivially dominates itself, so we only have to find if it dominates the
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
178 // other predecessors. Since the only way out of X is via NormalDest, X can
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
179 // only properly dominate a node if NormalDest dominates that node too.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
180 for (const_pred_iterator PI = pred_begin(End), E = pred_end(End);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
181 PI != E; ++PI) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
182 const BasicBlock *BB = *PI;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
183 if (BB == Start)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
184 continue;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
185
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
186 if (!dominates(End, BB))
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
187 return false;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
188 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
189 return true;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
190 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
191
77
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
192 bool DominatorTree::dominates(const BasicBlockEdge &BBE, const Use &U) const {
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
193 // Assert that we have a single edge. We could handle them by simply
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
194 // returning false, but since isSingleEdge is linear on the number of
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
195 // edges, the callers can normally handle them more efficiently.
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
196 assert(BBE.isSingleEdge() &&
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
197 "This function is not efficient in handling multiple edges");
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
198
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
199 Instruction *UserInst = cast<Instruction>(U.getUser());
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
200 // A PHI in the end of the edge is dominated by it.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
201 PHINode *PN = dyn_cast<PHINode>(UserInst);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
202 if (PN && PN->getParent() == BBE.getEnd() &&
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
203 PN->getIncomingBlock(U) == BBE.getStart())
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
204 return true;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
205
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
206 // Otherwise use the edge-dominates-block query, which
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
207 // handles the crazy critical edge cases properly.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
208 const BasicBlock *UseBB;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
209 if (PN)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
210 UseBB = PN->getIncomingBlock(U);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
211 else
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
212 UseBB = UserInst->getParent();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
213 return dominates(BBE, UseBB);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
214 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
215
77
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
216 bool DominatorTree::dominates(const Instruction *Def, const Use &U) const {
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
217 Instruction *UserInst = cast<Instruction>(U.getUser());
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
218 const BasicBlock *DefBB = Def->getParent();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
219
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
220 // Determine the block in which the use happens. PHI nodes use
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
221 // their operands on edges; simulate this by thinking of the use
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
222 // happening at the end of the predecessor block.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
223 const BasicBlock *UseBB;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
224 if (PHINode *PN = dyn_cast<PHINode>(UserInst))
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
225 UseBB = PN->getIncomingBlock(U);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
226 else
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
227 UseBB = UserInst->getParent();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
228
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
229 // Any unreachable use is dominated, even if Def == User.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
230 if (!isReachableFromEntry(UseBB))
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
231 return true;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
232
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
233 // Unreachable definitions don't dominate anything.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
234 if (!isReachableFromEntry(DefBB))
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
235 return false;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
236
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
237 // Invoke instructions define their return values on the edges to their normal
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
238 // successors, so we have to handle them specially.
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
239 // Among other things, this means they don't dominate anything in
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
240 // their own block, except possibly a phi, so we don't need to
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
241 // walk the block in any case.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
242 if (const InvokeInst *II = dyn_cast<InvokeInst>(Def)) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
243 BasicBlock *NormalDest = II->getNormalDest();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
244 BasicBlockEdge E(DefBB, NormalDest);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
245 return dominates(E, U);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
246 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
247
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
248 // If the def and use are in different blocks, do a simple CFG dominator
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
249 // tree query.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
250 if (DefBB != UseBB)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
251 return dominates(DefBB, UseBB);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
252
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
253 // Ok, def and use are in the same block. If the def is an invoke, it
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
254 // doesn't dominate anything in the block. If it's a PHI, it dominates
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
255 // everything in the block.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
256 if (isa<PHINode>(UserInst))
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
257 return true;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
258
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
259 // Otherwise, just loop through the basic block until we find Def or User.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
260 BasicBlock::const_iterator I = DefBB->begin();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
261 for (; &*I != Def && &*I != UserInst; ++I)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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262 /*empty*/;
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263
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264 return &*I != UserInst;
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265 }
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266
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267 bool DominatorTree::isReachableFromEntry(const Use &U) const {
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268 Instruction *I = dyn_cast<Instruction>(U.getUser());
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269
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270 // ConstantExprs aren't really reachable from the entry block, but they
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271 // don't need to be treated like unreachable code either.
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272 if (!I) return true;
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273
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274 // PHI nodes use their operands on their incoming edges.
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275 if (PHINode *PN = dyn_cast<PHINode>(I))
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276 return isReachableFromEntry(PN->getIncomingBlock(U));
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277
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278 // Everything else uses their operands in their own block.
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279 return isReachableFromEntry(I->getParent());
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280 }
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281
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282 void DominatorTree::verifyDomTree() const {
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283 Function &F = *getRoot()->getParent();
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284
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285 DominatorTree OtherDT;
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286 OtherDT.recalculate(F);
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287 if (compare(OtherDT)) {
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288 errs() << "DominatorTree is not up to date!\nComputed:\n";
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289 print(errs());
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290 errs() << "\nActual:\n";
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291 OtherDT.print(errs());
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292 abort();
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293 }
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294 }
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295
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296 //===----------------------------------------------------------------------===//
83
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297 // DominatorTreeAnalysis and related pass implementations
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298 //===----------------------------------------------------------------------===//
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299 //
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300 // This implements the DominatorTreeAnalysis which is used with the new pass
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301 // manager. It also implements some methods from utility passes.
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302 //
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303 //===----------------------------------------------------------------------===//
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304
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305 DominatorTree DominatorTreeAnalysis::run(Function &F) {
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306 DominatorTree DT;
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307 DT.recalculate(F);
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308 return DT;
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309 }
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310
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311 char DominatorTreeAnalysis::PassID;
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312
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313 DominatorTreePrinterPass::DominatorTreePrinterPass(raw_ostream &OS) : OS(OS) {}
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314
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315 PreservedAnalyses DominatorTreePrinterPass::run(Function &F,
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316 FunctionAnalysisManager *AM) {
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317 OS << "DominatorTree for function: " << F.getName() << "\n";
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318 AM->getResult<DominatorTreeAnalysis>(F).print(OS);
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319
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320 return PreservedAnalyses::all();
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321 }
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322
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323 PreservedAnalyses DominatorTreeVerifierPass::run(Function &F,
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324 FunctionAnalysisManager *AM) {
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325 AM->getResult<DominatorTreeAnalysis>(F).verifyDomTree();
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326
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327 return PreservedAnalyses::all();
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328 }
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329
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330 //===----------------------------------------------------------------------===//
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331 // DominatorTreeWrapperPass Implementation
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332 //===----------------------------------------------------------------------===//
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333 //
83
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334 // The implementation details of the wrapper pass that holds a DominatorTree
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335 // suitable for use with the legacy pass manager.
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336 //
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337 //===----------------------------------------------------------------------===//
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338
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339 char DominatorTreeWrapperPass::ID = 0;
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340 INITIALIZE_PASS(DominatorTreeWrapperPass, "domtree",
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341 "Dominator Tree Construction", true, true)
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342
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343 bool DominatorTreeWrapperPass::runOnFunction(Function &F) {
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344 DT.recalculate(F);
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345 return false;
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346 }
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347
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348 void DominatorTreeWrapperPass::verifyAnalysis() const {
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349 if (VerifyDomInfo)
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350 DT.verifyDomTree();
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351 }
77
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352
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353 void DominatorTreeWrapperPass::print(raw_ostream &OS, const Module *) const {
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354 DT.print(OS);
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355 }
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356