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annotate lib/IR/PassRegistry.cpp @ 33:e4204d083e25 LLVM3.5

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LLVM 3.5
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 14:32:10 +0900
parents 95c75e76d11b
children 54457678186b
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1 //===- PassRegistry.cpp - Pass Registration Implementation ----------------===//
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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 the PassRegistry, with which passes are registered on
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11 // initialization, and supports the PassManager in dependency resolution.
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12 //
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13 //===----------------------------------------------------------------------===//
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14
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15 #include "llvm/PassRegistry.h"
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16 #include "llvm/ADT/DenseMap.h"
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17 #include "llvm/ADT/SmallPtrSet.h"
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18 #include "llvm/ADT/StringMap.h"
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19 #include "llvm/IR/Function.h"
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20 #include "llvm/PassSupport.h"
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21 #include "llvm/Support/Compiler.h"
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22 #include "llvm/Support/ManagedStatic.h"
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23 #include "llvm/Support/Mutex.h"
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24 #include "llvm/Support/RWMutex.h"
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25 #include <vector>
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26
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27 using namespace llvm;
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28
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29 // FIXME: We use ManagedStatic to erase the pass registrar on shutdown.
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30 // Unfortunately, passes are registered with static ctors, and having
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31 // llvm_shutdown clear this map prevents successful resurrection after
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32 // llvm_shutdown is run. Ideally we should find a solution so that we don't
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33 // leak the map, AND can still resurrect after shutdown.
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34 static ManagedStatic<PassRegistry> PassRegistryObj;
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35 PassRegistry *PassRegistry::getPassRegistry() {
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36 return &*PassRegistryObj;
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37 }
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38
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39 static ManagedStatic<sys::SmartRWMutex<true> > Lock;
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40
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41 //===----------------------------------------------------------------------===//
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42 // PassRegistryImpl
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43 //
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44
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45 namespace {
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46 struct PassRegistryImpl {
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47 /// PassInfoMap - Keep track of the PassInfo object for each registered pass.
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48 typedef DenseMap<const void*, const PassInfo*> MapType;
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49 MapType PassInfoMap;
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50
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51 typedef StringMap<const PassInfo*> StringMapType;
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52 StringMapType PassInfoStringMap;
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53
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54 /// AnalysisGroupInfo - Keep track of information for each analysis group.
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55 struct AnalysisGroupInfo {
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56 SmallPtrSet<const PassInfo *, 8> Implementations;
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57 };
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58 DenseMap<const PassInfo*, AnalysisGroupInfo> AnalysisGroupInfoMap;
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59
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60 std::vector<const PassInfo*> ToFree;
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61 std::vector<PassRegistrationListener*> Listeners;
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62 };
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63 } // end anonymous namespace
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64
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65 void *PassRegistry::getImpl() const {
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66 if (!pImpl)
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67 pImpl = new PassRegistryImpl();
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68 return pImpl;
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69 }
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70
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71 //===----------------------------------------------------------------------===//
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72 // Accessors
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73 //
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74
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75 PassRegistry::~PassRegistry() {
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76 sys::SmartScopedWriter<true> Guard(*Lock);
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77 PassRegistryImpl *Impl = static_cast<PassRegistryImpl*>(pImpl);
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78
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79 for (std::vector<const PassInfo*>::iterator I = Impl->ToFree.begin(),
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80 E = Impl->ToFree.end(); I != E; ++I)
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81 delete *I;
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82
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83 delete Impl;
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84 pImpl = 0;
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85 }
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86
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87 const PassInfo *PassRegistry::getPassInfo(const void *TI) const {
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88 sys::SmartScopedReader<true> Guard(*Lock);
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89 PassRegistryImpl *Impl = static_cast<PassRegistryImpl*>(getImpl());
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90 PassRegistryImpl::MapType::const_iterator I = Impl->PassInfoMap.find(TI);
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91 return I != Impl->PassInfoMap.end() ? I->second : 0;
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92 }
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93
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94 const PassInfo *PassRegistry::getPassInfo(StringRef Arg) const {
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95 sys::SmartScopedReader<true> Guard(*Lock);
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96 PassRegistryImpl *Impl = static_cast<PassRegistryImpl*>(getImpl());
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97 PassRegistryImpl::StringMapType::const_iterator
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98 I = Impl->PassInfoStringMap.find(Arg);
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99 return I != Impl->PassInfoStringMap.end() ? I->second : 0;
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100 }
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101
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102 //===----------------------------------------------------------------------===//
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103 // Pass Registration mechanism
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104 //
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105
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106 void PassRegistry::registerPass(const PassInfo &PI, bool ShouldFree) {
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107 sys::SmartScopedWriter<true> Guard(*Lock);
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108 PassRegistryImpl *Impl = static_cast<PassRegistryImpl*>(getImpl());
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109 bool Inserted =
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110 Impl->PassInfoMap.insert(std::make_pair(PI.getTypeInfo(),&PI)).second;
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111 assert(Inserted && "Pass registered multiple times!");
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112 (void)Inserted;
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113 Impl->PassInfoStringMap[PI.getPassArgument()] = &PI;
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114
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115 // Notify any listeners.
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116 for (std::vector<PassRegistrationListener*>::iterator
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117 I = Impl->Listeners.begin(), E = Impl->Listeners.end(); I != E; ++I)
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118 (*I)->passRegistered(&PI);
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119
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120 if (ShouldFree) Impl->ToFree.push_back(&PI);
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121 }
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122
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123 void PassRegistry::unregisterPass(const PassInfo &PI) {
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124 sys::SmartScopedWriter<true> Guard(*Lock);
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125 PassRegistryImpl *Impl = static_cast<PassRegistryImpl*>(getImpl());
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126 PassRegistryImpl::MapType::iterator I =
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127 Impl->PassInfoMap.find(PI.getTypeInfo());
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128 assert(I != Impl->PassInfoMap.end() && "Pass registered but not in map!");
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129
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130 // Remove pass from the map.
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131 Impl->PassInfoMap.erase(I);
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132 Impl->PassInfoStringMap.erase(PI.getPassArgument());
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133 }
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134
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135 void PassRegistry::enumerateWith(PassRegistrationListener *L) {
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136 sys::SmartScopedReader<true> Guard(*Lock);
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137 PassRegistryImpl *Impl = static_cast<PassRegistryImpl*>(getImpl());
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138 for (PassRegistryImpl::MapType::const_iterator I = Impl->PassInfoMap.begin(),
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139 E = Impl->PassInfoMap.end(); I != E; ++I)
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140 L->passEnumerate(I->second);
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141 }
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142
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143
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144 /// Analysis Group Mechanisms.
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145 void PassRegistry::registerAnalysisGroup(const void *InterfaceID,
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146 const void *PassID,
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147 PassInfo& Registeree,
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148 bool isDefault,
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149 bool ShouldFree) {
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150 PassInfo *InterfaceInfo = const_cast<PassInfo*>(getPassInfo(InterfaceID));
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151 if (InterfaceInfo == 0) {
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152 // First reference to Interface, register it now.
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153 registerPass(Registeree);
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154 InterfaceInfo = &Registeree;
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155 }
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156 assert(Registeree.isAnalysisGroup() &&
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157 "Trying to join an analysis group that is a normal pass!");
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158
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159 if (PassID) {
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160 PassInfo *ImplementationInfo = const_cast<PassInfo*>(getPassInfo(PassID));
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161 assert(ImplementationInfo &&
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162 "Must register pass before adding to AnalysisGroup!");
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163
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164 sys::SmartScopedWriter<true> Guard(*Lock);
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165
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166 // Make sure we keep track of the fact that the implementation implements
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167 // the interface.
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168 ImplementationInfo->addInterfaceImplemented(InterfaceInfo);
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169
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170 PassRegistryImpl *Impl = static_cast<PassRegistryImpl*>(getImpl());
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171 PassRegistryImpl::AnalysisGroupInfo &AGI =
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172 Impl->AnalysisGroupInfoMap[InterfaceInfo];
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173 assert(AGI.Implementations.count(ImplementationInfo) == 0 &&
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174 "Cannot add a pass to the same analysis group more than once!");
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175 AGI.Implementations.insert(ImplementationInfo);
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176 if (isDefault) {
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177 assert(InterfaceInfo->getNormalCtor() == 0 &&
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178 "Default implementation for analysis group already specified!");
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179 assert(ImplementationInfo->getNormalCtor() &&
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180 "Cannot specify pass as default if it does not have a default ctor");
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181 InterfaceInfo->setNormalCtor(ImplementationInfo->getNormalCtor());
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182 }
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183 }
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184
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185 PassRegistryImpl *Impl = static_cast<PassRegistryImpl*>(getImpl());
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186 if (ShouldFree) Impl->ToFree.push_back(&Registeree);
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187 }
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188
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189 void PassRegistry::addRegistrationListener(PassRegistrationListener *L) {
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190 sys::SmartScopedWriter<true> Guard(*Lock);
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191 PassRegistryImpl *Impl = static_cast<PassRegistryImpl*>(getImpl());
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192 Impl->Listeners.push_back(L);
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193 }
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194
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195 void PassRegistry::removeRegistrationListener(PassRegistrationListener *L) {
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196 sys::SmartScopedWriter<true> Guard(*Lock);
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197
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198 // NOTE: This is necessary, because removeRegistrationListener() can be called
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199 // as part of the llvm_shutdown sequence. Since we have no control over the
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200 // order of that sequence, we need to gracefully handle the case where the
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201 // PassRegistry is destructed before the object that triggers this call.
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202 if (!pImpl) return;
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203
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204 PassRegistryImpl *Impl = static_cast<PassRegistryImpl*>(getImpl());
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205 std::vector<PassRegistrationListener*>::iterator I =
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206 std::find(Impl->Listeners.begin(), Impl->Listeners.end(), L);
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207 assert(I != Impl->Listeners.end() &&
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208 "PassRegistrationListener not registered!");
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209 Impl->Listeners.erase(I);
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210 }