annotate include/llvm/PassAnalysisSupport.h @ 134:3a76565eade5 LLVM5.0.1

update 5.0.1
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1 //===- llvm/PassAnalysisSupport.h - Analysis Pass Support code --*- 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 // This file defines stuff that is used to define and "use" Analysis Passes.
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11 // This file is automatically #included by Pass.h, so:
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12 //
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13 // NO .CPP FILES SHOULD INCLUDE THIS FILE DIRECTLY
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14 //
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15 // Instead, #include Pass.h
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16 //
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17 //===----------------------------------------------------------------------===//
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18
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19 #ifndef LLVM_PASSANALYSISSUPPORT_H
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20 #define LLVM_PASSANALYSISSUPPORT_H
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21
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22 #include "Pass.h"
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23 #include "llvm/ADT/SmallVector.h"
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24 #include "llvm/ADT/StringRef.h"
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25 #include <cassert>
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26 #include <utility>
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27 #include <vector>
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28
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29 namespace llvm {
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30
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31 class Function;
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32 class Pass;
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33 class PMDataManager;
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34
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35 //===----------------------------------------------------------------------===//
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36 /// Represent the analysis usage information of a pass. This tracks analyses
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37 /// that the pass REQUIRES (must be available when the pass runs), REQUIRES
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38 /// TRANSITIVE (must be available throughout the lifetime of the pass), and
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39 /// analyses that the pass PRESERVES (the pass does not invalidate the results
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40 /// of these analyses). This information is provided by a pass to the Pass
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41 /// infrastructure through the getAnalysisUsage virtual function.
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42 ///
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43 class AnalysisUsage {
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44 public:
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45 using VectorType = SmallVectorImpl<AnalysisID>;
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46
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47 private:
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48 /// Sets of analyses required and preserved by a pass
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49 // TODO: It's not clear that SmallVector is an appropriate data structure for
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50 // this usecase. The sizes were picked to minimize wasted space, but are
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51 // otherwise fairly meaningless.
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52 SmallVector<AnalysisID, 8> Required;
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53 SmallVector<AnalysisID, 2> RequiredTransitive;
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54 SmallVector<AnalysisID, 2> Preserved;
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55 SmallVector<AnalysisID, 0> Used;
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56 bool PreservesAll = false;
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57
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58 public:
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59 AnalysisUsage() = default;
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60
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61 ///@{
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62 /// Add the specified ID to the required set of the usage info for a pass.
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63 AnalysisUsage &addRequiredID(const void *ID);
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64 AnalysisUsage &addRequiredID(char &ID);
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65 template<class PassClass>
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66 AnalysisUsage &addRequired() {
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67 return addRequiredID(PassClass::ID);
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68 }
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69
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70 AnalysisUsage &addRequiredTransitiveID(char &ID);
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71 template<class PassClass>
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72 AnalysisUsage &addRequiredTransitive() {
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73 return addRequiredTransitiveID(PassClass::ID);
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74 }
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75 ///@}
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76
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77 ///@{
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78 /// Add the specified ID to the set of analyses preserved by this pass.
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79 AnalysisUsage &addPreservedID(const void *ID) {
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80 Preserved.push_back(ID);
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81 return *this;
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82 }
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83 AnalysisUsage &addPreservedID(char &ID) {
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84 Preserved.push_back(&ID);
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85 return *this;
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86 }
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87 /// Add the specified Pass class to the set of analyses preserved by this pass.
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88 template<class PassClass>
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89 AnalysisUsage &addPreserved() {
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90 Preserved.push_back(&PassClass::ID);
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91 return *this;
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92 }
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93 ///@}
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94
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95 ///@{
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96 /// Add the specified ID to the set of analyses used by this pass if they are
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97 /// available..
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98 AnalysisUsage &addUsedIfAvailableID(const void *ID) {
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99 Used.push_back(ID);
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100 return *this;
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101 }
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102 AnalysisUsage &addUsedIfAvailableID(char &ID) {
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103 Used.push_back(&ID);
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104 return *this;
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105 }
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106 /// Add the specified Pass class to the set of analyses used by this pass.
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107 template<class PassClass>
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108 AnalysisUsage &addUsedIfAvailable() {
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109 Used.push_back(&PassClass::ID);
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110 return *this;
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111 }
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112 ///@}
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113
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114 /// Add the Pass with the specified argument string to the set of analyses
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115 /// preserved by this pass. If no such Pass exists, do nothing. This can be
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116 /// useful when a pass is trivially preserved, but may not be linked in. Be
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117 /// careful about spelling!
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118 AnalysisUsage &addPreserved(StringRef Arg);
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119
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120 /// Set by analyses that do not transform their input at all
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121 void setPreservesAll() { PreservesAll = true; }
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122
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123 /// Determine whether a pass said it does not transform its input at all
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124 bool getPreservesAll() const { return PreservesAll; }
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125
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126 /// This function should be called by the pass, iff they do not:
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127 ///
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128 /// 1. Add or remove basic blocks from the function
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129 /// 2. Modify terminator instructions in any way.
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130 ///
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131 /// This function annotates the AnalysisUsage info object to say that analyses
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132 /// that only depend on the CFG are preserved by this pass.
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133 void setPreservesCFG();
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134
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135 const VectorType &getRequiredSet() const { return Required; }
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136 const VectorType &getRequiredTransitiveSet() const {
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137 return RequiredTransitive;
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138 }
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139 const VectorType &getPreservedSet() const { return Preserved; }
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140 const VectorType &getUsedSet() const { return Used; }
0
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141 };
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142
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143 //===----------------------------------------------------------------------===//
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144 /// AnalysisResolver - Simple interface used by Pass objects to pull all
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145 /// analysis information out of pass manager that is responsible to manage
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146 /// the pass.
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147 ///
0
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148 class AnalysisResolver {
121
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diff changeset
149 public:
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60c9769439b8 LLVM 3.7
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150 AnalysisResolver() = delete;
121
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151 explicit AnalysisResolver(PMDataManager &P) : PM(P) {}
0
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152
121
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153 PMDataManager &getPMDataManager() { return PM; }
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154
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155 /// Find pass that is implementing PI.
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156 Pass *findImplPass(AnalysisID PI) {
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157 Pass *ResultPass = nullptr;
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158 for (const auto &AnalysisImpl : AnalysisImpls) {
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159 if (AnalysisImpl.first == PI) {
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160 ResultPass = AnalysisImpl.second;
0
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161 break;
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162 }
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163 }
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164 return ResultPass;
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165 }
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166
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167 /// Find pass that is implementing PI. Initialize pass for Function F.
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168 Pass *findImplPass(Pass *P, AnalysisID PI, Function &F);
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169
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170 void addAnalysisImplsPair(AnalysisID PI, Pass *P) {
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171 if (findImplPass(PI) == P)
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172 return;
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173 std::pair<AnalysisID, Pass*> pir = std::make_pair(PI,P);
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174 AnalysisImpls.push_back(pir);
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175 }
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176
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177 /// Clear cache that is used to connect a pass to the analysis (PassInfo).
0
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178 void clearAnalysisImpls() {
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179 AnalysisImpls.clear();
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180 }
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181
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182 /// Return analysis result or null if it doesn't exist.
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183 Pass *getAnalysisIfAvailable(AnalysisID ID, bool Direction) const;
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184
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185 private:
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186 /// This keeps track of which passes implements the interfaces that are
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187 /// required by the current pass (to implement getAnalysis()).
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188 std::vector<std::pair<AnalysisID, Pass *>> AnalysisImpls;
0
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189
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190 /// PassManager that is used to resolve analysis info
0
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191 PMDataManager &PM;
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192 };
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193
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194 /// getAnalysisIfAvailable<AnalysisType>() - Subclasses use this function to
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195 /// get analysis information that might be around, for example to update it.
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196 /// This is different than getAnalysis in that it can fail (if the analysis
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197 /// results haven't been computed), so should only be used if you can handle
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198 /// the case when the analysis is not available. This method is often used by
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199 /// transformation APIs to update analysis results for a pass automatically as
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200 /// the transform is performed.
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diff changeset
201 template<typename AnalysisType>
95c75e76d11b LLVM 3.4
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diff changeset
202 AnalysisType *Pass::getAnalysisIfAvailable() const {
95c75e76d11b LLVM 3.4
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diff changeset
203 assert(Resolver && "Pass not resident in a PassManager object!");
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204
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diff changeset
205 const void *PI = &AnalysisType::ID;
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206
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diff changeset
207 Pass *ResultPass = Resolver->getAnalysisIfAvailable(PI, true);
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diff changeset
208 if (!ResultPass) return nullptr;
0
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diff changeset
209
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diff changeset
210 // Because the AnalysisType may not be a subclass of pass (for
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diff changeset
211 // AnalysisGroups), we use getAdjustedAnalysisPointer here to potentially
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diff changeset
212 // adjust the return pointer (because the class may multiply inherit, once
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diff changeset
213 // from pass, once from AnalysisType).
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diff changeset
214 return (AnalysisType*)ResultPass->getAdjustedAnalysisPointer(PI);
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215 }
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diff changeset
216
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217 /// getAnalysis<AnalysisType>() - This function is used by subclasses to get
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218 /// to the analysis information that they claim to use by overriding the
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diff changeset
219 /// getAnalysisUsage function.
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diff changeset
220 template<typename AnalysisType>
95c75e76d11b LLVM 3.4
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diff changeset
221 AnalysisType &Pass::getAnalysis() const {
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diff changeset
222 assert(Resolver && "Pass has not been inserted into a PassManager object!");
95c75e76d11b LLVM 3.4
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diff changeset
223 return getAnalysisID<AnalysisType>(&AnalysisType::ID);
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diff changeset
224 }
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diff changeset
225
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diff changeset
226 template<typename AnalysisType>
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diff changeset
227 AnalysisType &Pass::getAnalysisID(AnalysisID PI) const {
95c75e76d11b LLVM 3.4
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diff changeset
228 assert(PI && "getAnalysis for unregistered pass!");
95c75e76d11b LLVM 3.4
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diff changeset
229 assert(Resolver&&"Pass has not been inserted into a PassManager object!");
95c75e76d11b LLVM 3.4
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diff changeset
230 // PI *must* appear in AnalysisImpls. Because the number of passes used
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diff changeset
231 // should be a small number, we just do a linear search over a (dense)
95c75e76d11b LLVM 3.4
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parents:
diff changeset
232 // vector.
95c75e76d11b LLVM 3.4
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diff changeset
233 Pass *ResultPass = Resolver->findImplPass(PI);
121
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diff changeset
234 assert(ResultPass &&
803732b1fca8 LLVM 5.0
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diff changeset
235 "getAnalysis*() called on an analysis that was not "
803732b1fca8 LLVM 5.0
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diff changeset
236 "'required' by pass!");
0
95c75e76d11b LLVM 3.4
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parents:
diff changeset
237
95c75e76d11b LLVM 3.4
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diff changeset
238 // Because the AnalysisType may not be a subclass of pass (for
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parents:
diff changeset
239 // AnalysisGroups), we use getAdjustedAnalysisPointer here to potentially
95c75e76d11b LLVM 3.4
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parents:
diff changeset
240 // adjust the return pointer (because the class may multiply inherit, once
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
241 // from pass, once from AnalysisType).
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
242 return *(AnalysisType*)ResultPass->getAdjustedAnalysisPointer(PI);
95c75e76d11b LLVM 3.4
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parents:
diff changeset
243 }
95c75e76d11b LLVM 3.4
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parents:
diff changeset
244
95c75e76d11b LLVM 3.4
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diff changeset
245 /// getAnalysis<AnalysisType>() - This function is used by subclasses to get
95c75e76d11b LLVM 3.4
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diff changeset
246 /// to the analysis information that they claim to use by overriding the
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parents:
diff changeset
247 /// getAnalysisUsage function.
95c75e76d11b LLVM 3.4
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diff changeset
248 template<typename AnalysisType>
95c75e76d11b LLVM 3.4
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diff changeset
249 AnalysisType &Pass::getAnalysis(Function &F) {
95c75e76d11b LLVM 3.4
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diff changeset
250 assert(Resolver &&"Pass has not been inserted into a PassManager object!");
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diff changeset
251
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diff changeset
252 return getAnalysisID<AnalysisType>(&AnalysisType::ID, F);
95c75e76d11b LLVM 3.4
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diff changeset
253 }
95c75e76d11b LLVM 3.4
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parents:
diff changeset
254
95c75e76d11b LLVM 3.4
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parents:
diff changeset
255 template<typename AnalysisType>
95c75e76d11b LLVM 3.4
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parents:
diff changeset
256 AnalysisType &Pass::getAnalysisID(AnalysisID PI, Function &F) {
95c75e76d11b LLVM 3.4
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diff changeset
257 assert(PI && "getAnalysis for unregistered pass!");
95c75e76d11b LLVM 3.4
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diff changeset
258 assert(Resolver && "Pass has not been inserted into a PassManager object!");
95c75e76d11b LLVM 3.4
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diff changeset
259 // PI *must* appear in AnalysisImpls. Because the number of passes used
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diff changeset
260 // should be a small number, we just do a linear search over a (dense)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
261 // vector.
95c75e76d11b LLVM 3.4
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parents:
diff changeset
262 Pass *ResultPass = Resolver->findImplPass(this, PI, F);
95c75e76d11b LLVM 3.4
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parents:
diff changeset
263 assert(ResultPass && "Unable to find requested analysis info");
95
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parents: 83
diff changeset
264
0
95c75e76d11b LLVM 3.4
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parents:
diff changeset
265 // Because the AnalysisType may not be a subclass of pass (for
95c75e76d11b LLVM 3.4
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parents:
diff changeset
266 // AnalysisGroups), we use getAdjustedAnalysisPointer here to potentially
95c75e76d11b LLVM 3.4
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parents:
diff changeset
267 // adjust the return pointer (because the class may multiply inherit, once
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
268 // from pass, once from AnalysisType).
95c75e76d11b LLVM 3.4
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parents:
diff changeset
269 return *(AnalysisType*)ResultPass->getAdjustedAnalysisPointer(PI);
95c75e76d11b LLVM 3.4
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parents:
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270 }
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272 } // end namespace llvm
0
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274 #endif // LLVM_PASSANALYSISSUPPORT_H