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annotate lib/Transforms/IPO/ExtractGV.cpp @ 80:67baa08a3894

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update to LLVM 3.6
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 25 Sep 2014 16:56:18 +0900
parents 54457678186b
children 60c9769439b8
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1 //===-- ExtractGV.cpp - Global Value extraction pass ----------------------===//
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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 pass extracts global values
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #include "llvm/Transforms/IPO.h"
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15 #include "llvm/ADT/SetVector.h"
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16 #include "llvm/IR/Constants.h"
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17 #include "llvm/IR/Instructions.h"
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18 #include "llvm/IR/LLVMContext.h"
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19 #include "llvm/IR/Module.h"
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20 #include "llvm/Pass.h"
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21 #include <algorithm>
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22 using namespace llvm;
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23
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24 /// Make sure GV is visible from both modules. Delete is true if it is
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25 /// being deleted from this module.
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26 /// This also makes sure GV cannot be dropped so that references from
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27 /// the split module remain valid.
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28 static void makeVisible(GlobalValue &GV, bool Delete) {
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29 bool Local = GV.hasLocalLinkage();
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30 if (Local || Delete) {
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31 GV.setLinkage(GlobalValue::ExternalLinkage);
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32 if (Local)
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33 GV.setVisibility(GlobalValue::HiddenVisibility);
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34 return;
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35 }
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36
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37 if (!GV.hasLinkOnceLinkage()) {
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38 assert(!GV.isDiscardableIfUnused());
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39 return;
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40 }
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41
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42 // Map linkonce* to weak* so that llvm doesn't drop this GV.
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43 switch(GV.getLinkage()) {
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44 default:
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45 llvm_unreachable("Unexpected linkage");
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46 case GlobalValue::LinkOnceAnyLinkage:
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47 GV.setLinkage(GlobalValue::WeakAnyLinkage);
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48 return;
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49 case GlobalValue::LinkOnceODRLinkage:
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50 GV.setLinkage(GlobalValue::WeakODRLinkage);
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51 return;
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52 }
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53 }
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54
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55 namespace {
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56 /// @brief A pass to extract specific functions and their dependencies.
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57 class GVExtractorPass : public ModulePass {
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58 SetVector<GlobalValue *> Named;
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59 bool deleteStuff;
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60 public:
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61 static char ID; // Pass identification, replacement for typeid
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62
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63 /// FunctionExtractorPass - If deleteFn is true, this pass deletes as the
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64 /// specified function. Otherwise, it deletes as much of the module as
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65 /// possible, except for the function specified.
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66 ///
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67 explicit GVExtractorPass(std::vector<GlobalValue*>& GVs, bool deleteS = true)
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68 : ModulePass(ID), Named(GVs.begin(), GVs.end()), deleteStuff(deleteS) {}
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69
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70 bool runOnModule(Module &M) override {
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71 // Visit the global inline asm.
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72 if (!deleteStuff)
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73 M.setModuleInlineAsm("");
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74
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75 // For simplicity, just give all GlobalValues ExternalLinkage. A trickier
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76 // implementation could figure out which GlobalValues are actually
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77 // referenced by the Named set, and which GlobalValues in the rest of
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78 // the module are referenced by the NamedSet, and get away with leaving
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79 // more internal and private things internal and private. But for now,
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80 // be conservative and simple.
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81
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82 // Visit the GlobalVariables.
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83 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
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84 I != E; ++I) {
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85 bool Delete =
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86 deleteStuff == (bool)Named.count(I) && !I->isDeclaration();
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87 if (!Delete) {
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88 if (I->hasAvailableExternallyLinkage())
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89 continue;
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90 if (I->getName() == "llvm.global_ctors")
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91 continue;
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92 }
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93
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94 makeVisible(*I, Delete);
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95
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96 if (Delete)
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97 I->setInitializer(nullptr);
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98 }
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99
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100 // Visit the Functions.
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101 for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
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102 bool Delete =
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103 deleteStuff == (bool)Named.count(I) && !I->isDeclaration();
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104 if (!Delete) {
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105 if (I->hasAvailableExternallyLinkage())
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106 continue;
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107 }
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108
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109 makeVisible(*I, Delete);
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110
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111 if (Delete)
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112 I->deleteBody();
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113 }
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114
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115 // Visit the Aliases.
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116 for (Module::alias_iterator I = M.alias_begin(), E = M.alias_end();
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117 I != E;) {
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118 Module::alias_iterator CurI = I;
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119 ++I;
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120
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121 bool Delete = deleteStuff == (bool)Named.count(CurI);
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122 makeVisible(*CurI, Delete);
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123
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124 if (Delete) {
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125 Type *Ty = CurI->getType()->getElementType();
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126
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127 CurI->removeFromParent();
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128 llvm::Value *Declaration;
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129 if (FunctionType *FTy = dyn_cast<FunctionType>(Ty)) {
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130 Declaration = Function::Create(FTy, GlobalValue::ExternalLinkage,
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131 CurI->getName(), &M);
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132
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133 } else {
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134 Declaration =
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135 new GlobalVariable(M, Ty, false, GlobalValue::ExternalLinkage,
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136 nullptr, CurI->getName());
0
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137
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138 }
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139 CurI->replaceAllUsesWith(Declaration);
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140 delete CurI;
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141 }
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142 }
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143
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144 return true;
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145 }
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146 };
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147
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148 char GVExtractorPass::ID = 0;
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149 }
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150
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151 ModulePass *llvm::createGVExtractionPass(std::vector<GlobalValue*>& GVs,
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152 bool deleteFn) {
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153 return new GVExtractorPass(GVs, deleteFn);
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154 }