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annotate include/llvm/PassManagers.h @ 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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1 //===- llvm/PassManagers.h - Pass Infrastructure classes -------*- C++ -*-===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This file declares the LLVM Pass Manager infrastructure.
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #ifndef LLVM_PASSMANAGERS_H
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15 #define LLVM_PASSMANAGERS_H
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16
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17 #include "llvm/ADT/ArrayRef.h"
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18 #include "llvm/ADT/DenseMap.h"
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19 #include "llvm/ADT/SmallPtrSet.h"
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20 #include "llvm/ADT/SmallVector.h"
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21 #include "llvm/Pass.h"
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22 #include <map>
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23 #include <vector>
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24
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25 //===----------------------------------------------------------------------===//
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26 // Overview:
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27 // The Pass Manager Infrastructure manages passes. It's responsibilities are:
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28 //
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29 // o Manage optimization pass execution order
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30 // o Make required Analysis information available before pass P is run
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31 // o Release memory occupied by dead passes
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32 // o If Analysis information is dirtied by a pass then regenerate Analysis
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33 // information before it is consumed by another pass.
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34 //
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35 // Pass Manager Infrastructure uses multiple pass managers. They are
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36 // PassManager, FunctionPassManager, MPPassManager, FPPassManager, BBPassManager.
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37 // This class hierarchy uses multiple inheritance but pass managers do not
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38 // derive from another pass manager.
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39 //
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40 // PassManager and FunctionPassManager are two top-level pass manager that
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41 // represents the external interface of this entire pass manager infrastucture.
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42 //
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43 // Important classes :
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44 //
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45 // [o] class PMTopLevelManager;
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46 //
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47 // Two top level managers, PassManager and FunctionPassManager, derive from
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48 // PMTopLevelManager. PMTopLevelManager manages information used by top level
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49 // managers such as last user info.
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50 //
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51 // [o] class PMDataManager;
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52 //
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53 // PMDataManager manages information, e.g. list of available analysis info,
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54 // used by a pass manager to manage execution order of passes. It also provides
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55 // a place to implement common pass manager APIs. All pass managers derive from
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56 // PMDataManager.
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57 //
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58 // [o] class BBPassManager : public FunctionPass, public PMDataManager;
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59 //
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60 // BBPassManager manages BasicBlockPasses.
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61 //
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62 // [o] class FunctionPassManager;
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63 //
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64 // This is a external interface used by JIT to manage FunctionPasses. This
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65 // interface relies on FunctionPassManagerImpl to do all the tasks.
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66 //
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67 // [o] class FunctionPassManagerImpl : public ModulePass, PMDataManager,
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68 // public PMTopLevelManager;
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69 //
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70 // FunctionPassManagerImpl is a top level manager. It manages FPPassManagers
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71 //
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72 // [o] class FPPassManager : public ModulePass, public PMDataManager;
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73 //
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74 // FPPassManager manages FunctionPasses and BBPassManagers
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75 //
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76 // [o] class MPPassManager : public Pass, public PMDataManager;
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77 //
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78 // MPPassManager manages ModulePasses and FPPassManagers
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79 //
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80 // [o] class PassManager;
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81 //
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82 // This is a external interface used by various tools to manages passes. It
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83 // relies on PassManagerImpl to do all the tasks.
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84 //
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85 // [o] class PassManagerImpl : public Pass, public PMDataManager,
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86 // public PMTopLevelManager
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87 //
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88 // PassManagerImpl is a top level pass manager responsible for managing
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89 // MPPassManagers.
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90 //===----------------------------------------------------------------------===//
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91
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92 #include "llvm/Support/PrettyStackTrace.h"
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93
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94 namespace llvm {
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95 class Module;
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96 class Pass;
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97 class StringRef;
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98 class Value;
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99 class Timer;
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100 class PMDataManager;
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101
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102 // enums for debugging strings
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103 enum PassDebuggingString {
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104 EXECUTION_MSG, // "Executing Pass '"
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105 MODIFICATION_MSG, // "' Made Modification '"
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106 FREEING_MSG, // " Freeing Pass '"
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107 ON_BASICBLOCK_MSG, // "' on BasicBlock '" + PassName + "'...\n"
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108 ON_FUNCTION_MSG, // "' on Function '" + FunctionName + "'...\n"
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109 ON_MODULE_MSG, // "' on Module '" + ModuleName + "'...\n"
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110 ON_REGION_MSG, // " 'on Region ...\n'"
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111 ON_LOOP_MSG, // " 'on Loop ...\n'"
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112 ON_CG_MSG // "' on Call Graph ...\n'"
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113 };
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114
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115 /// PassManagerPrettyStackEntry - This is used to print informative information
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116 /// about what pass is running when/if a stack trace is generated.
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117 class PassManagerPrettyStackEntry : public PrettyStackTraceEntry {
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118 Pass *P;
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119 Value *V;
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120 Module *M;
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121 public:
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122 explicit PassManagerPrettyStackEntry(Pass *p)
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123 : P(p), V(0), M(0) {} // When P is releaseMemory'd.
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124 PassManagerPrettyStackEntry(Pass *p, Value &v)
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125 : P(p), V(&v), M(0) {} // When P is run on V
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126 PassManagerPrettyStackEntry(Pass *p, Module &m)
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127 : P(p), V(0), M(&m) {} // When P is run on M
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128
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129 /// print - Emit information about this stack frame to OS.
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130 virtual void print(raw_ostream &OS) const;
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131 };
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132
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133
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134 //===----------------------------------------------------------------------===//
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135 // PMStack
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136 //
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137 /// PMStack - This class implements a stack data structure of PMDataManager
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138 /// pointers.
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139 ///
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140 /// Top level pass managers (see PassManager.cpp) maintain active Pass Managers
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141 /// using PMStack. Each Pass implements assignPassManager() to connect itself
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142 /// with appropriate manager. assignPassManager() walks PMStack to find
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143 /// suitable manager.
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144 class PMStack {
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145 public:
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146 typedef std::vector<PMDataManager *>::const_reverse_iterator iterator;
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147 iterator begin() const { return S.rbegin(); }
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148 iterator end() const { return S.rend(); }
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149
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150 void pop();
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151 PMDataManager *top() const { return S.back(); }
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152 void push(PMDataManager *PM);
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153 bool empty() const { return S.empty(); }
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154
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155 void dump() const;
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156
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157 private:
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158 std::vector<PMDataManager *> S;
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159 };
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160
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161
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162 //===----------------------------------------------------------------------===//
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163 // PMTopLevelManager
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164 //
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165 /// PMTopLevelManager manages LastUser info and collects common APIs used by
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166 /// top level pass managers.
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167 class PMTopLevelManager {
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168 protected:
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169 explicit PMTopLevelManager(PMDataManager *PMDM);
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170
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171 unsigned getNumContainedManagers() const {
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172 return (unsigned)PassManagers.size();
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173 }
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174
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175 void initializeAllAnalysisInfo();
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176
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177 private:
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178 virtual PMDataManager *getAsPMDataManager() = 0;
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179 virtual PassManagerType getTopLevelPassManagerType() = 0;
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180
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181 public:
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182 /// Schedule pass P for execution. Make sure that passes required by
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183 /// P are run before P is run. Update analysis info maintained by
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184 /// the manager. Remove dead passes. This is a recursive function.
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185 void schedulePass(Pass *P);
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186
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187 /// Set pass P as the last user of the given analysis passes.
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188 void setLastUser(ArrayRef<Pass*> AnalysisPasses, Pass *P);
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189
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190 /// Collect passes whose last user is P
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191 void collectLastUses(SmallVectorImpl<Pass *> &LastUses, Pass *P);
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192
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193 /// Find the pass that implements Analysis AID. Search immutable
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194 /// passes and all pass managers. If desired pass is not found
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195 /// then return NULL.
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196 Pass *findAnalysisPass(AnalysisID AID);
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197
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198 /// Find analysis usage information for the pass P.
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199 AnalysisUsage *findAnalysisUsage(Pass *P);
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200
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201 virtual ~PMTopLevelManager();
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202
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203 /// Add immutable pass and initialize it.
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204 inline void addImmutablePass(ImmutablePass *P) {
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205 P->initializePass();
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206 ImmutablePasses.push_back(P);
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207 }
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208
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209 inline SmallVectorImpl<ImmutablePass *>& getImmutablePasses() {
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210 return ImmutablePasses;
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211 }
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212
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213 void addPassManager(PMDataManager *Manager) {
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214 PassManagers.push_back(Manager);
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215 }
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216
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217 // Add Manager into the list of managers that are not directly
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218 // maintained by this top level pass manager
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219 inline void addIndirectPassManager(PMDataManager *Manager) {
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220 IndirectPassManagers.push_back(Manager);
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221 }
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222
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223 // Print passes managed by this top level manager.
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224 void dumpPasses() const;
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225 void dumpArguments() const;
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226
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227 // Active Pass Managers
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228 PMStack activeStack;
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229
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230 protected:
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231
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232 /// Collection of pass managers
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233 SmallVector<PMDataManager *, 8> PassManagers;
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234
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235 private:
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236
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237 /// Collection of pass managers that are not directly maintained
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238 /// by this pass manager
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239 SmallVector<PMDataManager *, 8> IndirectPassManagers;
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240
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241 // Map to keep track of last user of the analysis pass.
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242 // LastUser->second is the last user of Lastuser->first.
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243 DenseMap<Pass *, Pass *> LastUser;
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244
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245 // Map to keep track of passes that are last used by a pass.
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246 // This inverse map is initialized at PM->run() based on
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247 // LastUser map.
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248 DenseMap<Pass *, SmallPtrSet<Pass *, 8> > InversedLastUser;
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249
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250 /// Immutable passes are managed by top level manager.
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251 SmallVector<ImmutablePass *, 8> ImmutablePasses;
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252
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253 DenseMap<Pass *, AnalysisUsage *> AnUsageMap;
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254 };
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255
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256
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257
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258 //===----------------------------------------------------------------------===//
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259 // PMDataManager
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260
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261 /// PMDataManager provides the common place to manage the analysis data
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262 /// used by pass managers.
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263 class PMDataManager {
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264 public:
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265
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266 explicit PMDataManager() : TPM(NULL), Depth(0) {
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267 initializeAnalysisInfo();
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268 }
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269
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270 virtual ~PMDataManager();
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271
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272 virtual Pass *getAsPass() = 0;
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273
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274 /// Augment AvailableAnalysis by adding analysis made available by pass P.
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275 void recordAvailableAnalysis(Pass *P);
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276
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277 /// verifyPreservedAnalysis -- Verify analysis presreved by pass P.
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278 void verifyPreservedAnalysis(Pass *P);
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279
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280 /// Remove Analysis that is not preserved by the pass
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281 void removeNotPreservedAnalysis(Pass *P);
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282
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283 /// Remove dead passes used by P.
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284 void removeDeadPasses(Pass *P, StringRef Msg,
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285 enum PassDebuggingString);
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286
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287 /// Remove P.
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288 void freePass(Pass *P, StringRef Msg,
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289 enum PassDebuggingString);
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290
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291 /// Add pass P into the PassVector. Update
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292 /// AvailableAnalysis appropriately if ProcessAnalysis is true.
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293 void add(Pass *P, bool ProcessAnalysis = true);
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294
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295 /// Add RequiredPass into list of lower level passes required by pass P.
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296 /// RequiredPass is run on the fly by Pass Manager when P requests it
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297 /// through getAnalysis interface.
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298 virtual void addLowerLevelRequiredPass(Pass *P, Pass *RequiredPass);
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299
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300 virtual Pass *getOnTheFlyPass(Pass *P, AnalysisID PI, Function &F);
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301
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302 /// Initialize available analysis information.
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303 void initializeAnalysisInfo() {
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304 AvailableAnalysis.clear();
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305 for (unsigned i = 0; i < PMT_Last; ++i)
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306 InheritedAnalysis[i] = NULL;
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307 }
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308
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309 // Return true if P preserves high level analysis used by other
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310 // passes that are managed by this manager.
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311 bool preserveHigherLevelAnalysis(Pass *P);
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312
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313
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314 /// Populate RequiredPasses with analysis pass that are required by
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315 /// pass P and are available. Populate ReqPassNotAvailable with analysis
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316 /// pass that are required by pass P but are not available.
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317 void collectRequiredAnalysis(SmallVectorImpl<Pass *> &RequiredPasses,
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318 SmallVectorImpl<AnalysisID> &ReqPassNotAvailable,
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319 Pass *P);
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320
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321 /// All Required analyses should be available to the pass as it runs! Here
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322 /// we fill in the AnalysisImpls member of the pass so that it can
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323 /// successfully use the getAnalysis() method to retrieve the
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324 /// implementations it needs.
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325 void initializeAnalysisImpl(Pass *P);
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326
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327 /// Find the pass that implements Analysis AID. If desired pass is not found
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328 /// then return NULL.
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329 Pass *findAnalysisPass(AnalysisID AID, bool Direction);
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330
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331 // Access toplevel manager
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332 PMTopLevelManager *getTopLevelManager() { return TPM; }
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333 void setTopLevelManager(PMTopLevelManager *T) { TPM = T; }
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334
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335 unsigned getDepth() const { return Depth; }
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336 void setDepth(unsigned newDepth) { Depth = newDepth; }
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337
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338 // Print routines used by debug-pass
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339 void dumpLastUses(Pass *P, unsigned Offset) const;
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340 void dumpPassArguments() const;
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341 void dumpPassInfo(Pass *P, enum PassDebuggingString S1,
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342 enum PassDebuggingString S2, StringRef Msg);
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343 void dumpRequiredSet(const Pass *P) const;
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344 void dumpPreservedSet(const Pass *P) const;
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345
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346 unsigned getNumContainedPasses() const {
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347 return (unsigned)PassVector.size();
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348 }
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349
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350 virtual PassManagerType getPassManagerType() const {
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351 assert ( 0 && "Invalid use of getPassManagerType");
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352 return PMT_Unknown;
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353 }
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354
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355 DenseMap<AnalysisID, Pass*> *getAvailableAnalysis() {
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356 return &AvailableAnalysis;
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357 }
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358
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359 // Collect AvailableAnalysis from all the active Pass Managers.
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360 void populateInheritedAnalysis(PMStack &PMS) {
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361 unsigned Index = 0;
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362 for (PMStack::iterator I = PMS.begin(), E = PMS.end();
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363 I != E; ++I)
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364 InheritedAnalysis[Index++] = (*I)->getAvailableAnalysis();
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365 }
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366
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367 protected:
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368
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369 // Top level manager.
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370 PMTopLevelManager *TPM;
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371
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372 // Collection of pass that are managed by this manager
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373 SmallVector<Pass *, 16> PassVector;
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374
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375 // Collection of Analysis provided by Parent pass manager and
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376 // used by current pass manager. At at time there can not be more
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377 // then PMT_Last active pass mangers.
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378 DenseMap<AnalysisID, Pass *> *InheritedAnalysis[PMT_Last];
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379
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380 /// isPassDebuggingExecutionsOrMore - Return true if -debug-pass=Executions
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381 /// or higher is specified.
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382 bool isPassDebuggingExecutionsOrMore() const;
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383
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384 private:
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385 void dumpAnalysisUsage(StringRef Msg, const Pass *P,
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386 const AnalysisUsage::VectorType &Set) const;
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387
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388 // Set of available Analysis. This information is used while scheduling
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389 // pass. If a pass requires an analysis which is not available then
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390 // the required analysis pass is scheduled to run before the pass itself is
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391 // scheduled to run.
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392 DenseMap<AnalysisID, Pass*> AvailableAnalysis;
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393
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394 // Collection of higher level analysis used by the pass managed by
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395 // this manager.
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396 SmallVector<Pass *, 8> HigherLevelAnalysis;
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397
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398 unsigned Depth;
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399 };
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400
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401 //===----------------------------------------------------------------------===//
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402 // FPPassManager
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403 //
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404 /// FPPassManager manages BBPassManagers and FunctionPasses.
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405 /// It batches all function passes and basic block pass managers together and
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406 /// sequence them to process one function at a time before processing next
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407 /// function.
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408 class FPPassManager : public ModulePass, public PMDataManager {
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409 public:
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410 static char ID;
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411 explicit FPPassManager()
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412 : ModulePass(ID), PMDataManager() { }
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413
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414 /// run - Execute all of the passes scheduled for execution. Keep track of
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415 /// whether any of the passes modifies the module, and if so, return true.
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416 bool runOnFunction(Function &F);
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417 bool runOnModule(Module &M);
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418
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419 /// cleanup - After running all passes, clean up pass manager cache.
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420 void cleanup();
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421
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422 /// doInitialization - Overrides ModulePass doInitialization for global
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423 /// initialization tasks
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424 ///
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425 using ModulePass::doInitialization;
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426
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427 /// doInitialization - Run all of the initializers for the function passes.
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428 ///
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429 bool doInitialization(Module &M);
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430
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431 /// doFinalization - Overrides ModulePass doFinalization for global
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432 /// finalization tasks
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433 ///
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434 using ModulePass::doFinalization;
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435
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436 /// doFinalization - Run all of the finalizers for the function passes.
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437 ///
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438 bool doFinalization(Module &M);
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439
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440 virtual PMDataManager *getAsPMDataManager() { return this; }
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441 virtual Pass *getAsPass() { return this; }
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442
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443 /// Pass Manager itself does not invalidate any analysis info.
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444 void getAnalysisUsage(AnalysisUsage &Info) const {
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445 Info.setPreservesAll();
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446 }
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447
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448 // Print passes managed by this manager
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449 void dumpPassStructure(unsigned Offset);
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450
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451 virtual const char *getPassName() const {
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452 return "Function Pass Manager";
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453 }
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454
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455 FunctionPass *getContainedPass(unsigned N) {
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456 assert ( N < PassVector.size() && "Pass number out of range!");
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457 FunctionPass *FP = static_cast<FunctionPass *>(PassVector[N]);
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458 return FP;
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459 }
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460
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461 virtual PassManagerType getPassManagerType() const {
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462 return PMT_FunctionPassManager;
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463 }
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464 };
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465
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466 Timer *getPassTimer(Pass *);
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467
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468 }
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469
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470 #endif