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annotate lib/IR/Pass.cpp @ 148:63bd29f05246

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merged
author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Wed, 14 Aug 2019 19:46:37 +0900
parents c2174574ed3a
children
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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/Attributes.h"
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18 #include "llvm/IR/BasicBlock.h"
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19 #include "llvm/IR/Function.h"
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20 #include "llvm/IR/IRPrintingPasses.h"
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21 #include "llvm/IR/LLVMContext.h"
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22 #include "llvm/IR/LegacyPassNameParser.h"
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23 #include "llvm/IR/Module.h"
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24 #include "llvm/IR/OptBisect.h"
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25 #include "llvm/PassInfo.h"
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26 #include "llvm/PassRegistry.h"
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27 #include "llvm/PassSupport.h"
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28 #include "llvm/Support/Compiler.h"
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29 #include "llvm/Support/Debug.h"
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30 #include "llvm/Support/raw_ostream.h"
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31 #include <cassert>
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32
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33 using namespace llvm;
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34
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35 #define DEBUG_TYPE "ir"
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36
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37 //===----------------------------------------------------------------------===//
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38 // Pass Implementation
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39 //
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40
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41 // Force out-of-line virtual method.
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42 Pass::~Pass() {
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43 delete Resolver;
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44 }
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45
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46 // Force out-of-line virtual method.
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47 ModulePass::~ModulePass() = default;
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48
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49 Pass *ModulePass::createPrinterPass(raw_ostream &OS,
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50 const std::string &Banner) const {
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51 return createPrintModulePass(OS, Banner);
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52 }
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53
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54 PassManagerType ModulePass::getPotentialPassManagerType() const {
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55 return PMT_ModulePassManager;
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56 }
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57
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58 static std::string getDescription(const Module &M) {
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59 return "module (" + M.getName().str() + ")";
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60 }
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61
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62 bool ModulePass::skipModule(Module &M) const {
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63 OptPassGate &Gate = M.getContext().getOptPassGate();
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64 return Gate.isEnabled() && !Gate.shouldRunPass(this, getDescription(M));
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65 }
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66
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67 bool Pass::mustPreserveAnalysisID(char &AID) const {
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68 return Resolver->getAnalysisIfAvailable(&AID, true) != nullptr;
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69 }
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71 // dumpPassStructure - Implement the -debug-pass=Structure option
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72 void Pass::dumpPassStructure(unsigned Offset) {
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73 dbgs().indent(Offset*2) << getPassName() << "\n";
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74 }
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75
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76 /// getPassName - Return a nice clean name for a pass. This usually
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77 /// implemented in terms of the name that is registered by one of the
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78 /// Registration templates, but can be overloaded directly.
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79 StringRef Pass::getPassName() const {
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80 AnalysisID AID = getPassID();
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81 const PassInfo *PI = PassRegistry::getPassRegistry()->getPassInfo(AID);
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82 if (PI)
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83 return PI->getPassName();
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84 return "Unnamed pass: implement Pass::getPassName()";
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85 }
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86
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87 void Pass::preparePassManager(PMStack &) {
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88 // By default, don't do anything.
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89 }
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91 PassManagerType Pass::getPotentialPassManagerType() const {
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92 // Default implementation.
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93 return PMT_Unknown;
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94 }
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96 void Pass::getAnalysisUsage(AnalysisUsage &) const {
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97 // By default, no analysis results are used, all are invalidated.
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98 }
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99
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100 void Pass::releaseMemory() {
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101 // By default, don't do anything.
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102 }
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103
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104 void Pass::verifyAnalysis() const {
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105 // By default, don't do anything.
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106 }
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107
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108 void *Pass::getAdjustedAnalysisPointer(AnalysisID AID) {
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109 return this;
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110 }
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111
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112 ImmutablePass *Pass::getAsImmutablePass() {
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113 return nullptr;
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114 }
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115
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116 PMDataManager *Pass::getAsPMDataManager() {
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117 return nullptr;
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118 }
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119
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120 void Pass::setResolver(AnalysisResolver *AR) {
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121 assert(!Resolver && "Resolver is already set");
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122 Resolver = AR;
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123 }
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124
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125 // print - Print out the internal state of the pass. This is called by Analyze
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126 // to print out the contents of an analysis. Otherwise it is not necessary to
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127 // implement this method.
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128 void Pass::print(raw_ostream &OS, const Module *) const {
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129 OS << "Pass::print not implemented for pass: '" << getPassName() << "'!\n";
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130 }
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131
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132 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
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133 // dump - call print(cerr);
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134 LLVM_DUMP_METHOD void Pass::dump() const {
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135 print(dbgs(), nullptr);
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136 }
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137 #endif
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138
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139 //===----------------------------------------------------------------------===//
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140 // ImmutablePass Implementation
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141 //
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142 // Force out-of-line virtual method.
121
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143 ImmutablePass::~ImmutablePass() = default;
0
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144
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145 void ImmutablePass::initializePass() {
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146 // By default, don't do anything.
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147 }
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148
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149 //===----------------------------------------------------------------------===//
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150 // FunctionPass Implementation
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151 //
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152
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153 Pass *FunctionPass::createPrinterPass(raw_ostream &OS,
0
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154 const std::string &Banner) const {
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155 return createPrintFunctionPass(OS, Banner);
0
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156 }
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157
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158 PassManagerType FunctionPass::getPotentialPassManagerType() const {
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159 return PMT_FunctionPassManager;
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160 }
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161
147
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162 static std::string getDescription(const Function &F) {
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163 return "function (" + F.getName().str() + ")";
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164 }
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165
120
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166 bool FunctionPass::skipFunction(const Function &F) const {
147
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167 OptPassGate &Gate = F.getContext().getOptPassGate();
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168 if (Gate.isEnabled() && !Gate.shouldRunPass(this, getDescription(F)))
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169 return true;
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170
147
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171 if (F.hasOptNone()) {
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172 LLVM_DEBUG(dbgs() << "Skipping pass '" << getPassName() << "' on function "
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173 << F.getName() << "\n");
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174 return true;
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175 }
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176 return false;
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177 }
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178
0
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179 //===----------------------------------------------------------------------===//
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180 // BasicBlockPass Implementation
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181 //
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182
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183 Pass *BasicBlockPass::createPrinterPass(raw_ostream &OS,
0
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184 const std::string &Banner) const {
121
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185 return createPrintBasicBlockPass(OS, Banner);
0
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186 }
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187
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188 bool BasicBlockPass::doInitialization(Function &) {
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189 // By default, don't do anything.
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190 return false;
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191 }
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192
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193 bool BasicBlockPass::doFinalization(Function &) {
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194 // By default, don't do anything.
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195 return false;
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196 }
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197
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diff changeset
198 static std::string getDescription(const BasicBlock &BB) {
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199 return "basic block (" + BB.getName().str() + ") in function (" +
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200 BB.getParent()->getName().str() + ")";
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201 }
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202
120
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203 bool BasicBlockPass::skipBasicBlock(const BasicBlock &BB) const {
77
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204 const Function *F = BB.getParent();
120
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205 if (!F)
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206 return false;
147
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diff changeset
207 OptPassGate &Gate = F->getContext().getOptPassGate();
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208 if (Gate.isEnabled() && !Gate.shouldRunPass(this, getDescription(BB)))
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209 return true;
147
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diff changeset
210 if (F->hasOptNone()) {
77
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211 // Report this only once per function.
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212 if (&BB == &F->getEntryBlock())
147
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diff changeset
213 LLVM_DEBUG(dbgs() << "Skipping pass '" << getPassName()
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214 << "' on function " << F->getName() << "\n");
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215 return true;
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216 }
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217 return false;
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218 }
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219
0
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220 PassManagerType BasicBlockPass::getPotentialPassManagerType() const {
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221 return PMT_BasicBlockPassManager;
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222 }
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223
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224 const PassInfo *Pass::lookupPassInfo(const void *TI) {
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225 return PassRegistry::getPassRegistry()->getPassInfo(TI);
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226 }
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227
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228 const PassInfo *Pass::lookupPassInfo(StringRef Arg) {
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229 return PassRegistry::getPassRegistry()->getPassInfo(Arg);
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230 }
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231
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232 Pass *Pass::createPass(AnalysisID ID) {
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233 const PassInfo *PI = PassRegistry::getPassRegistry()->getPassInfo(ID);
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234 if (!PI)
77
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235 return nullptr;
0
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236 return PI->createPass();
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237 }
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238
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239 //===----------------------------------------------------------------------===//
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240 // Analysis Group Implementation Code
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241 //===----------------------------------------------------------------------===//
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242
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243 // RegisterAGBase implementation
121
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244
120
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245 RegisterAGBase::RegisterAGBase(StringRef Name, const void *InterfaceID,
0
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246 const void *PassID, bool isDefault)
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247 : PassInfo(Name, InterfaceID) {
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diff changeset
248 PassRegistry::getPassRegistry()->registerAnalysisGroup(InterfaceID, PassID,
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249 *this, isDefault);
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250 }
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251
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252 //===----------------------------------------------------------------------===//
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253 // PassRegistrationListener implementation
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diff changeset
254 //
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255
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256 // enumeratePasses - Iterate over the registered passes, calling the
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257 // passEnumerate callback on each PassInfo object.
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258 void PassRegistrationListener::enumeratePasses() {
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diff changeset
259 PassRegistry::getPassRegistry()->enumerateWith(this);
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diff changeset
260 }
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261
83
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Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
parents: 77
diff changeset
262 PassNameParser::PassNameParser(cl::Option &O)
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parents: 77
diff changeset
263 : cl::parser<const PassInfo *>(O) {
77
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diff changeset
264 PassRegistry::getPassRegistry()->addRegistrationListener(this);
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diff changeset
265 }
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diff changeset
266
121
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diff changeset
267 // This only gets called during static destruction, in which case the
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diff changeset
268 // PassRegistry will have already been destroyed by llvm_shutdown(). So
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diff changeset
269 // attempting to remove the registration listener is an error.
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diff changeset
270 PassNameParser::~PassNameParser() = default;
0
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271
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272 //===----------------------------------------------------------------------===//
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273 // AnalysisUsage Class Implementation
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diff changeset
274 //
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275
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276 namespace {
121
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diff changeset
277
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diff changeset
278 struct GetCFGOnlyPasses : public PassRegistrationListener {
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279 using VectorType = AnalysisUsage::VectorType;
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280
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diff changeset
281 VectorType &CFGOnlyList;
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diff changeset
282
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diff changeset
283 GetCFGOnlyPasses(VectorType &L) : CFGOnlyList(L) {}
0
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284
121
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285 void passEnumerate(const PassInfo *P) override {
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286 if (P->isCFGOnlyPass())
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287 CFGOnlyList.push_back(P->getTypeInfo());
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288 }
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289 };
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290
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291 } // end anonymous namespace
0
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292
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293 // setPreservesCFG - This function should be called to by the pass, iff they do
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294 // not:
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295 //
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296 // 1. Add or remove basic blocks from the function
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297 // 2. Modify terminator instructions in any way.
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298 //
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299 // This function annotates the AnalysisUsage info object to say that analyses
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300 // that only depend on the CFG are preserved by this pass.
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301 void AnalysisUsage::setPreservesCFG() {
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302 // Since this transformation doesn't modify the CFG, it preserves all analyses
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303 // that only depend on the CFG (like dominators, loop info, etc...)
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304 GetCFGOnlyPasses(Preserved).enumeratePasses();
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305 }
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306
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307 AnalysisUsage &AnalysisUsage::addPreserved(StringRef Arg) {
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308 const PassInfo *PI = Pass::lookupPassInfo(Arg);
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309 // If the pass exists, preserve it. Otherwise silently do nothing.
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310 if (PI) Preserved.push_back(PI->getTypeInfo());
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311 return *this;
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312 }
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313
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314 AnalysisUsage &AnalysisUsage::addRequiredID(const void *ID) {
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315 Required.push_back(ID);
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316 return *this;
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317 }
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318
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319 AnalysisUsage &AnalysisUsage::addRequiredID(char &ID) {
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320 Required.push_back(&ID);
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321 return *this;
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322 }
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323
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324 AnalysisUsage &AnalysisUsage::addRequiredTransitiveID(char &ID) {
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325 Required.push_back(&ID);
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326 RequiredTransitive.push_back(&ID);
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327 return *this;
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328 }