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1 //===- Pass.cpp - LLVM Pass Infrastructure Implementation -----------------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8 //
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9 // This file implements the LLVM Pass infrastructure. It is primarily
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10 // responsible with ensuring that passes are executed and batched together
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11 // optimally.
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12 //
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13 //===----------------------------------------------------------------------===//
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14
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15 #include "llvm/Pass.h"
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16 #include "llvm/Config/llvm-config.h"
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17 #include "llvm/IR/Function.h"
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18 #include "llvm/IR/IRPrintingPasses.h"
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19 #include "llvm/IR/LLVMContext.h"
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20 #include "llvm/IR/LegacyPassNameParser.h"
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21 #include "llvm/IR/Module.h"
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22 #include "llvm/IR/OptBisect.h"
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23 #include "llvm/PassInfo.h"
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24 #include "llvm/PassRegistry.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/raw_ostream.h"
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28 #include <cassert>
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29
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30 using namespace llvm;
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31
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32 #define DEBUG_TYPE "ir"
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33
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34 //===----------------------------------------------------------------------===//
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35 // Pass Implementation
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36 //
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37
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38 // Force out-of-line virtual method.
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39 Pass::~Pass() {
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40 delete Resolver;
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41 }
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42
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43 // Force out-of-line virtual method.
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44 ModulePass::~ModulePass() = default;
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45
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46 Pass *ModulePass::createPrinterPass(raw_ostream &OS,
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47 const std::string &Banner) const {
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48 return createPrintModulePass(OS, Banner);
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49 }
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50
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51 PassManagerType ModulePass::getPotentialPassManagerType() const {
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52 return PMT_ModulePassManager;
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53 }
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54
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55 static std::string getDescription(const Module &M) {
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56 return "module (" + M.getName().str() + ")";
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57 }
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58
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59 bool ModulePass::skipModule(Module &M) const {
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60 OptPassGate &Gate = M.getContext().getOptPassGate();
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61 return Gate.isEnabled() && !Gate.shouldRunPass(this, getDescription(M));
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62 }
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63
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64 bool Pass::mustPreserveAnalysisID(char &AID) const {
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65 return Resolver->getAnalysisIfAvailable(&AID, true) != nullptr;
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66 }
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67
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68 // dumpPassStructure - Implement the -debug-pass=Structure option
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69 void Pass::dumpPassStructure(unsigned Offset) {
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70 dbgs().indent(Offset*2) << getPassName() << "\n";
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71 }
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72
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73 /// getPassName - Return a nice clean name for a pass. This usually
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74 /// implemented in terms of the name that is registered by one of the
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75 /// Registration templates, but can be overloaded directly.
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76 StringRef Pass::getPassName() const {
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77 AnalysisID AID = getPassID();
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78 const PassInfo *PI = PassRegistry::getPassRegistry()->getPassInfo(AID);
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79 if (PI)
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80 return PI->getPassName();
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81 return "Unnamed pass: implement Pass::getPassName()";
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82 }
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83
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84 void Pass::preparePassManager(PMStack &) {
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85 // By default, don't do anything.
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86 }
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87
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88 PassManagerType Pass::getPotentialPassManagerType() const {
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89 // Default implementation.
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90 return PMT_Unknown;
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91 }
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92
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93 void Pass::getAnalysisUsage(AnalysisUsage &) const {
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94 // By default, no analysis results are used, all are invalidated.
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95 }
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96
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97 void Pass::releaseMemory() {
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98 // By default, don't do anything.
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99 }
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100
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101 void Pass::verifyAnalysis() const {
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102 // By default, don't do anything.
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103 }
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104
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105 void *Pass::getAdjustedAnalysisPointer(AnalysisID AID) {
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106 return this;
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107 }
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108
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109 ImmutablePass *Pass::getAsImmutablePass() {
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110 return nullptr;
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111 }
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112
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113 PMDataManager *Pass::getAsPMDataManager() {
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114 return nullptr;
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115 }
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116
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117 void Pass::setResolver(AnalysisResolver *AR) {
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118 assert(!Resolver && "Resolver is already set");
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119 Resolver = AR;
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120 }
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121
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122 // print - Print out the internal state of the pass. This is called by Analyze
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123 // to print out the contents of an analysis. Otherwise it is not necessary to
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124 // implement this method.
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125 void Pass::print(raw_ostream &OS, const Module *) const {
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126 OS << "Pass::print not implemented for pass: '" << getPassName() << "'!\n";
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127 }
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128
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129 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
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130 // dump - call print(cerr);
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131 LLVM_DUMP_METHOD void Pass::dump() const {
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132 print(dbgs(), nullptr);
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133 }
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134 #endif
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135
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136 //===----------------------------------------------------------------------===//
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137 // ImmutablePass Implementation
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138 //
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139 // Force out-of-line virtual method.
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140 ImmutablePass::~ImmutablePass() = default;
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141
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142 void ImmutablePass::initializePass() {
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143 // By default, don't do anything.
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144 }
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145
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146 //===----------------------------------------------------------------------===//
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147 // FunctionPass Implementation
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148 //
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149
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150 Pass *FunctionPass::createPrinterPass(raw_ostream &OS,
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151 const std::string &Banner) const {
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152 return createPrintFunctionPass(OS, Banner);
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153 }
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154
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155 PassManagerType FunctionPass::getPotentialPassManagerType() const {
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156 return PMT_FunctionPassManager;
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157 }
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158
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159 static std::string getDescription(const Function &F) {
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160 return "function (" + F.getName().str() + ")";
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161 }
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162
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163 bool FunctionPass::skipFunction(const Function &F) const {
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164 OptPassGate &Gate = F.getContext().getOptPassGate();
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165 if (Gate.isEnabled() && !Gate.shouldRunPass(this, getDescription(F)))
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166 return true;
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167
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168 if (F.hasOptNone()) {
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169 LLVM_DEBUG(dbgs() << "Skipping pass '" << getPassName() << "' on function "
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170 << F.getName() << "\n");
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171 return true;
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172 }
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173 return false;
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174 }
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175
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176 const PassInfo *Pass::lookupPassInfo(const void *TI) {
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177 return PassRegistry::getPassRegistry()->getPassInfo(TI);
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178 }
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179
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180 const PassInfo *Pass::lookupPassInfo(StringRef Arg) {
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181 return PassRegistry::getPassRegistry()->getPassInfo(Arg);
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182 }
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183
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184 Pass *Pass::createPass(AnalysisID ID) {
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185 const PassInfo *PI = PassRegistry::getPassRegistry()->getPassInfo(ID);
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186 if (!PI)
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187 return nullptr;
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188 return PI->createPass();
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189 }
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190
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191 //===----------------------------------------------------------------------===//
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192 // Analysis Group Implementation Code
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193 //===----------------------------------------------------------------------===//
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194
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195 // RegisterAGBase implementation
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196
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197 RegisterAGBase::RegisterAGBase(StringRef Name, const void *InterfaceID,
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198 const void *PassID, bool isDefault)
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199 : PassInfo(Name, InterfaceID) {
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200 PassRegistry::getPassRegistry()->registerAnalysisGroup(InterfaceID, PassID,
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201 *this, isDefault);
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202 }
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203
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204 //===----------------------------------------------------------------------===//
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205 // PassRegistrationListener implementation
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206 //
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207
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208 // enumeratePasses - Iterate over the registered passes, calling the
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209 // passEnumerate callback on each PassInfo object.
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210 void PassRegistrationListener::enumeratePasses() {
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211 PassRegistry::getPassRegistry()->enumerateWith(this);
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212 }
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213
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214 PassNameParser::PassNameParser(cl::Option &O)
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215 : cl::parser<const PassInfo *>(O) {
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216 PassRegistry::getPassRegistry()->addRegistrationListener(this);
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217 }
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218
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219 // This only gets called during static destruction, in which case the
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220 // PassRegistry will have already been destroyed by llvm_shutdown(). So
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221 // attempting to remove the registration listener is an error.
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222 PassNameParser::~PassNameParser() = default;
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223
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224 //===----------------------------------------------------------------------===//
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225 // AnalysisUsage Class Implementation
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226 //
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227
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228 namespace {
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229
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230 struct GetCFGOnlyPasses : public PassRegistrationListener {
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231 using VectorType = AnalysisUsage::VectorType;
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232
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233 VectorType &CFGOnlyList;
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234
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235 GetCFGOnlyPasses(VectorType &L) : CFGOnlyList(L) {}
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236
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237 void passEnumerate(const PassInfo *P) override {
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238 if (P->isCFGOnlyPass())
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239 CFGOnlyList.push_back(P->getTypeInfo());
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240 }
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241 };
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242
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243 } // end anonymous namespace
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244
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245 // setPreservesCFG - This function should be called to by the pass, iff they do
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246 // not:
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247 //
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248 // 1. Add or remove basic blocks from the function
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249 // 2. Modify terminator instructions in any way.
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250 //
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251 // This function annotates the AnalysisUsage info object to say that analyses
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252 // that only depend on the CFG are preserved by this pass.
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253 void AnalysisUsage::setPreservesCFG() {
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254 // Since this transformation doesn't modify the CFG, it preserves all analyses
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255 // that only depend on the CFG (like dominators, loop info, etc...)
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256 GetCFGOnlyPasses(Preserved).enumeratePasses();
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257 }
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258
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259 AnalysisUsage &AnalysisUsage::addPreserved(StringRef Arg) {
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260 const PassInfo *PI = Pass::lookupPassInfo(Arg);
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261 // If the pass exists, preserve it. Otherwise silently do nothing.
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262 if (PI) Preserved.push_back(PI->getTypeInfo());
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263 return *this;
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264 }
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265
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266 AnalysisUsage &AnalysisUsage::addRequiredID(const void *ID) {
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267 Required.push_back(ID);
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268 return *this;
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269 }
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270
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271 AnalysisUsage &AnalysisUsage::addRequiredID(char &ID) {
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272 Required.push_back(&ID);
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273 return *this;
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274 }
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275
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276 AnalysisUsage &AnalysisUsage::addRequiredTransitiveID(char &ID) {
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277 Required.push_back(&ID);
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278 RequiredTransitive.push_back(&ID);
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279 return *this;
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280 }
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