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annotate lib/Transforms/Utils/CloneModule.cpp @ 95:afa8332a0e37

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LLVM 3.8
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Tue, 13 Oct 2015 17:48:58 +0900
parents 60c9769439b8
children 7d135dc70f03
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1 //===- CloneModule.cpp - Clone an entire module ---------------------------===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This file implements the CloneModule interface which makes a copy of an
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11 // entire module.
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12 //
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13 //===----------------------------------------------------------------------===//
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14
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15 #include "llvm/Transforms/Utils/Cloning.h"
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16 #include "llvm/IR/Constant.h"
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17 #include "llvm/IR/DerivedTypes.h"
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18 #include "llvm/IR/Module.h"
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19 #include "llvm/Transforms/Utils/ValueMapper.h"
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20 #include "llvm-c/Core.h"
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21 using namespace llvm;
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22
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23 /// CloneModule - Return an exact copy of the specified module. This is not as
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24 /// easy as it might seem because we have to worry about making copies of global
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25 /// variables and functions, and making their (initializers and references,
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26 /// respectively) refer to the right globals.
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27 ///
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28 Module *llvm::CloneModule(const Module *M) {
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29 // Create the value map that maps things from the old module over to the new
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30 // module.
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31 ValueToValueMapTy VMap;
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32 return CloneModule(M, VMap);
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33 }
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34
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35 Module *llvm::CloneModule(const Module *M, ValueToValueMapTy &VMap) {
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36 return CloneModule(M, VMap, [](const GlobalValue *GV) { return true; });
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37 }
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38
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39 Module *llvm::CloneModule(
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40 const Module *M, ValueToValueMapTy &VMap,
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41 std::function<bool(const GlobalValue *)> ShouldCloneDefinition) {
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42 // First off, we need to create the new module.
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43 Module *New = new Module(M->getModuleIdentifier(), M->getContext());
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44 New->setDataLayout(M->getDataLayout());
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45 New->setTargetTriple(M->getTargetTriple());
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46 New->setModuleInlineAsm(M->getModuleInlineAsm());
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47
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48 // Loop over all of the global variables, making corresponding globals in the
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49 // new module. Here we add them to the VMap and to the new Module. We
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50 // don't worry about attributes or initializers, they will come later.
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51 //
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52 for (Module::const_global_iterator I = M->global_begin(), E = M->global_end();
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53 I != E; ++I) {
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54 GlobalVariable *GV = new GlobalVariable(*New,
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55 I->getType()->getElementType(),
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56 I->isConstant(), I->getLinkage(),
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57 (Constant*) nullptr, I->getName(),
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58 (GlobalVariable*) nullptr,
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59 I->getThreadLocalMode(),
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60 I->getType()->getAddressSpace());
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61 GV->copyAttributesFrom(&*I);
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62 VMap[&*I] = GV;
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63 }
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64
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65 // Loop over the functions in the module, making external functions as before
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66 for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I) {
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67 Function *NF =
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68 Function::Create(cast<FunctionType>(I->getType()->getElementType()),
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69 I->getLinkage(), I->getName(), New);
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70 NF->copyAttributesFrom(&*I);
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71 VMap[&*I] = NF;
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72 }
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73
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74 // Loop over the aliases in the module
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75 for (Module::const_alias_iterator I = M->alias_begin(), E = M->alias_end();
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76 I != E; ++I) {
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77 if (!ShouldCloneDefinition(&*I)) {
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78 // An alias cannot act as an external reference, so we need to create
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79 // either a function or a global variable depending on the value type.
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80 // FIXME: Once pointee types are gone we can probably pick one or the
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81 // other.
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82 GlobalValue *GV;
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83 if (I->getValueType()->isFunctionTy())
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84 GV = Function::Create(cast<FunctionType>(I->getValueType()),
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85 GlobalValue::ExternalLinkage, I->getName(), New);
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86 else
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87 GV = new GlobalVariable(
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88 *New, I->getValueType(), false, GlobalValue::ExternalLinkage,
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89 (Constant *)nullptr, I->getName(), (GlobalVariable *)nullptr,
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90 I->getThreadLocalMode(), I->getType()->getAddressSpace());
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91 VMap[&*I] = GV;
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92 // We do not copy attributes (mainly because copying between different
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93 // kinds of globals is forbidden), but this is generally not required for
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94 // correctness.
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95 continue;
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96 }
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97 auto *GA = GlobalAlias::create(I->getValueType(),
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98 I->getType()->getPointerAddressSpace(),
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99 I->getLinkage(), I->getName(), New);
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100 GA->copyAttributesFrom(&*I);
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101 VMap[&*I] = GA;
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102 }
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103
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104 // Now that all of the things that global variable initializer can refer to
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105 // have been created, loop through and copy the global variable referrers
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106 // over... We also set the attributes on the global now.
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107 //
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108 for (Module::const_global_iterator I = M->global_begin(), E = M->global_end();
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109 I != E; ++I) {
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110 GlobalVariable *GV = cast<GlobalVariable>(VMap[&*I]);
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111 if (!ShouldCloneDefinition(&*I)) {
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112 // Skip after setting the correct linkage for an external reference.
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113 GV->setLinkage(GlobalValue::ExternalLinkage);
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114 continue;
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115 }
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116 if (I->hasInitializer())
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117 GV->setInitializer(MapValue(I->getInitializer(), VMap));
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118 }
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119
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120 // Similarly, copy over function bodies now...
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121 //
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122 for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I) {
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123 Function *F = cast<Function>(VMap[&*I]);
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124 if (!ShouldCloneDefinition(&*I)) {
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125 // Skip after setting the correct linkage for an external reference.
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126 F->setLinkage(GlobalValue::ExternalLinkage);
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127 continue;
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128 }
0
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129 if (!I->isDeclaration()) {
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130 Function::arg_iterator DestI = F->arg_begin();
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131 for (Function::const_arg_iterator J = I->arg_begin(); J != I->arg_end();
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132 ++J) {
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133 DestI->setName(J->getName());
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134 VMap[&*J] = &*DestI++;
0
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135 }
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136
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137 SmallVector<ReturnInst*, 8> Returns; // Ignore returns cloned.
95
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138 CloneFunctionInto(F, &*I, VMap, /*ModuleLevelChanges=*/true, Returns);
0
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139 }
95
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140
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141 if (I->hasPersonalityFn())
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142 F->setPersonalityFn(MapValue(I->getPersonalityFn(), VMap));
0
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143 }
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144
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145 // And aliases
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146 for (Module::const_alias_iterator I = M->alias_begin(), E = M->alias_end();
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147 I != E; ++I) {
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148 // We already dealt with undefined aliases above.
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149 if (!ShouldCloneDefinition(&*I))
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150 continue;
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151 GlobalAlias *GA = cast<GlobalAlias>(VMap[&*I]);
0
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152 if (const Constant *C = I->getAliasee())
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153 GA->setAliasee(MapValue(C, VMap));
0
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154 }
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155
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156 // And named metadata....
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157 for (Module::const_named_metadata_iterator I = M->named_metadata_begin(),
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158 E = M->named_metadata_end(); I != E; ++I) {
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159 const NamedMDNode &NMD = *I;
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160 NamedMDNode *NewNMD = New->getOrInsertNamedMetadata(NMD.getName());
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161 for (unsigned i = 0, e = NMD.getNumOperands(); i != e; ++i)
83
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162 NewNMD->addOperand(MapMetadata(NMD.getOperand(i), VMap));
0
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163 }
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164
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165 return New;
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166 }
83
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167
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168 extern "C" {
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169
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170 LLVMModuleRef LLVMCloneModule(LLVMModuleRef M) {
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171 return wrap(CloneModule(unwrap(M)));
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172 }
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173
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174 }