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annotate lib/IR/Pass.cpp @ 3:9ad51c7bc036

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author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Wed, 15 May 2013 06:43:32 +0900
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children 54457678186b
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1 //===- Pass.cpp - LLVM Pass Infrastructure 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 LLVM Pass infrastructure. It is primarily
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11 // responsible with ensuring that passes are executed and batched together
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12 // optimally.
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13 //
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14 //===----------------------------------------------------------------------===//
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15
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16 #include "llvm/Pass.h"
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17 #include "llvm/Assembly/PrintModulePass.h"
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18 #include "llvm/PassRegistry.h"
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19 #include "llvm/Support/Debug.h"
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20 #include "llvm/Support/PassNameParser.h"
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21 #include "llvm/Support/raw_ostream.h"
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22 using namespace llvm;
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23
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24 //===----------------------------------------------------------------------===//
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25 // Pass Implementation
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26 //
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27
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28 // Force out-of-line virtual method.
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29 Pass::~Pass() {
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30 delete Resolver;
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31 }
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32
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33 // Force out-of-line virtual method.
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34 ModulePass::~ModulePass() { }
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35
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36 Pass *ModulePass::createPrinterPass(raw_ostream &O,
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37 const std::string &Banner) const {
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38 return createPrintModulePass(&O, false, Banner);
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39 }
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40
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41 PassManagerType ModulePass::getPotentialPassManagerType() const {
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42 return PMT_ModulePassManager;
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43 }
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44
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45 bool Pass::mustPreserveAnalysisID(char &AID) const {
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46 return Resolver->getAnalysisIfAvailable(&AID, true) != 0;
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47 }
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48
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49 // dumpPassStructure - Implement the -debug-pass=Structure option
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50 void Pass::dumpPassStructure(unsigned Offset) {
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51 dbgs().indent(Offset*2) << getPassName() << "\n";
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52 }
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53
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54 /// getPassName - Return a nice clean name for a pass. This usually
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55 /// implemented in terms of the name that is registered by one of the
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56 /// Registration templates, but can be overloaded directly.
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57 ///
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58 const char *Pass::getPassName() const {
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59 AnalysisID AID = getPassID();
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60 const PassInfo *PI = PassRegistry::getPassRegistry()->getPassInfo(AID);
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61 if (PI)
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62 return PI->getPassName();
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63 return "Unnamed pass: implement Pass::getPassName()";
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64 }
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65
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66 void Pass::preparePassManager(PMStack &) {
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67 // By default, don't do anything.
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68 }
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69
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70 PassManagerType Pass::getPotentialPassManagerType() const {
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71 // Default implementation.
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72 return PMT_Unknown;
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73 }
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74
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75 void Pass::getAnalysisUsage(AnalysisUsage &) const {
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76 // By default, no analysis results are used, all are invalidated.
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77 }
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78
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79 void Pass::releaseMemory() {
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80 // By default, don't do anything.
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81 }
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82
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83 void Pass::verifyAnalysis() const {
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84 // By default, don't do anything.
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85 }
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86
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87 void *Pass::getAdjustedAnalysisPointer(AnalysisID AID) {
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88 return this;
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89 }
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90
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91 ImmutablePass *Pass::getAsImmutablePass() {
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92 return 0;
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93 }
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94
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95 PMDataManager *Pass::getAsPMDataManager() {
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96 return 0;
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97 }
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98
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99 void Pass::setResolver(AnalysisResolver *AR) {
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100 assert(!Resolver && "Resolver is already set");
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101 Resolver = AR;
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102 }
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103
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104 // print - Print out the internal state of the pass. This is called by Analyze
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105 // to print out the contents of an analysis. Otherwise it is not necessary to
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106 // implement this method.
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107 //
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108 void Pass::print(raw_ostream &O,const Module*) const {
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109 O << "Pass::print not implemented for pass: '" << getPassName() << "'!\n";
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110 }
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111
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112 // dump - call print(cerr);
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113 void Pass::dump() const {
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114 print(dbgs(), 0);
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115 }
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116
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117 //===----------------------------------------------------------------------===//
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118 // ImmutablePass Implementation
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119 //
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120 // Force out-of-line virtual method.
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121 ImmutablePass::~ImmutablePass() { }
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122
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123 void ImmutablePass::initializePass() {
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124 // By default, don't do anything.
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125 }
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126
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127 //===----------------------------------------------------------------------===//
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128 // FunctionPass Implementation
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129 //
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130
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131 Pass *FunctionPass::createPrinterPass(raw_ostream &O,
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132 const std::string &Banner) const {
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133 return createPrintFunctionPass(Banner, &O);
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134 }
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135
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136 PassManagerType FunctionPass::getPotentialPassManagerType() const {
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137 return PMT_FunctionPassManager;
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138 }
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139
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140 //===----------------------------------------------------------------------===//
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141 // BasicBlockPass Implementation
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142 //
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143
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144 Pass *BasicBlockPass::createPrinterPass(raw_ostream &O,
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145 const std::string &Banner) const {
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146 return createPrintBasicBlockPass(&O, false, Banner);
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147 }
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148
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149 bool BasicBlockPass::doInitialization(Function &) {
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150 // By default, don't do anything.
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151 return false;
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152 }
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153
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154 bool BasicBlockPass::doFinalization(Function &) {
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155 // By default, don't do anything.
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156 return false;
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157 }
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158
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159 PassManagerType BasicBlockPass::getPotentialPassManagerType() const {
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160 return PMT_BasicBlockPassManager;
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161 }
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162
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163 const PassInfo *Pass::lookupPassInfo(const void *TI) {
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164 return PassRegistry::getPassRegistry()->getPassInfo(TI);
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165 }
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166
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167 const PassInfo *Pass::lookupPassInfo(StringRef Arg) {
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168 return PassRegistry::getPassRegistry()->getPassInfo(Arg);
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169 }
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170
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171 Pass *Pass::createPass(AnalysisID ID) {
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172 const PassInfo *PI = PassRegistry::getPassRegistry()->getPassInfo(ID);
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173 if (!PI)
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174 return NULL;
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175 return PI->createPass();
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176 }
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177
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178 Pass *PassInfo::createPass() const {
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179 assert((!isAnalysisGroup() || NormalCtor) &&
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180 "No default implementation found for analysis group!");
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181 assert(NormalCtor &&
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182 "Cannot call createPass on PassInfo without default ctor!");
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183 return NormalCtor();
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184 }
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185
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186 //===----------------------------------------------------------------------===//
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187 // Analysis Group Implementation Code
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188 //===----------------------------------------------------------------------===//
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189
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190 // RegisterAGBase implementation
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191 //
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192 RegisterAGBase::RegisterAGBase(const char *Name, const void *InterfaceID,
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193 const void *PassID, bool isDefault)
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194 : PassInfo(Name, InterfaceID) {
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195 PassRegistry::getPassRegistry()->registerAnalysisGroup(InterfaceID, PassID,
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196 *this, isDefault);
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197 }
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198
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199 //===----------------------------------------------------------------------===//
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200 // PassRegistrationListener implementation
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201 //
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202
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203 // PassRegistrationListener ctor - Add the current object to the list of
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204 // PassRegistrationListeners...
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205 PassRegistrationListener::PassRegistrationListener() {
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206 PassRegistry::getPassRegistry()->addRegistrationListener(this);
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207 }
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208
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209 // dtor - Remove object from list of listeners...
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210 PassRegistrationListener::~PassRegistrationListener() {
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211 PassRegistry::getPassRegistry()->removeRegistrationListener(this);
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212 }
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213
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214 // enumeratePasses - Iterate over the registered passes, calling the
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215 // passEnumerate callback on each PassInfo object.
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216 //
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217 void PassRegistrationListener::enumeratePasses() {
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218 PassRegistry::getPassRegistry()->enumerateWith(this);
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219 }
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220
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221 PassNameParser::~PassNameParser() {}
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222
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223 //===----------------------------------------------------------------------===//
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224 // AnalysisUsage Class Implementation
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225 //
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226
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227 namespace {
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228 struct GetCFGOnlyPasses : public PassRegistrationListener {
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229 typedef AnalysisUsage::VectorType VectorType;
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230 VectorType &CFGOnlyList;
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231 GetCFGOnlyPasses(VectorType &L) : CFGOnlyList(L) {}
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232
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233 void passEnumerate(const PassInfo *P) {
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234 if (P->isCFGOnlyPass())
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235 CFGOnlyList.push_back(P->getTypeInfo());
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236 }
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237 };
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238 }
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239
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240 // setPreservesCFG - This function should be called to by the pass, iff they do
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241 // not:
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242 //
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243 // 1. Add or remove basic blocks from the function
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244 // 2. Modify terminator instructions in any way.
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245 //
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246 // This function annotates the AnalysisUsage info object to say that analyses
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247 // that only depend on the CFG are preserved by this pass.
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248 //
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249 void AnalysisUsage::setPreservesCFG() {
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250 // Since this transformation doesn't modify the CFG, it preserves all analyses
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251 // that only depend on the CFG (like dominators, loop info, etc...)
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252 GetCFGOnlyPasses(Preserved).enumeratePasses();
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253 }
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254
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255 AnalysisUsage &AnalysisUsage::addPreserved(StringRef Arg) {
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256 const PassInfo *PI = Pass::lookupPassInfo(Arg);
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257 // If the pass exists, preserve it. Otherwise silently do nothing.
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258 if (PI) Preserved.push_back(PI->getTypeInfo());
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259 return *this;
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260 }
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261
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262 AnalysisUsage &AnalysisUsage::addRequiredID(const void *ID) {
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263 Required.push_back(ID);
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264 return *this;
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265 }
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266
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267 AnalysisUsage &AnalysisUsage::addRequiredID(char &ID) {
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268 Required.push_back(&ID);
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269 return *this;
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270 }
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271
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272 AnalysisUsage &AnalysisUsage::addRequiredTransitiveID(char &ID) {
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273 Required.push_back(&ID);
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274 RequiredTransitive.push_back(&ID);
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275 return *this;
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276 }