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annotate lib/Transforms/Utils/CloneModule.cpp @ 100:7d135dc70f03

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LLVM 3.9
author Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
date Tue, 26 Jan 2016 22:53:40 +0900
parents afa8332a0e37
children 1172e4bd9c6f
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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 /// This is not as easy as it might seem because we have to worry about making
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24 /// copies of global variables and functions, and making their (initializers and
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25 /// references, respectively) refer to the right globals.
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26 ///
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27 std::unique_ptr<Module> llvm::CloneModule(const Module *M) {
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28 // Create the value map that maps things from the old module over to the new
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29 // module.
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30 ValueToValueMapTy VMap;
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31 return CloneModule(M, VMap);
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32 }
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33
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34 std::unique_ptr<Module> llvm::CloneModule(const Module *M,
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35 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 std::unique_ptr<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 std::unique_ptr<Module> New =
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44 llvm::make_unique<Module>(M->getModuleIdentifier(), M->getContext());
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45 New->setDataLayout(M->getDataLayout());
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46 New->setTargetTriple(M->getTargetTriple());
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47 New->setModuleInlineAsm(M->getModuleInlineAsm());
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48
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49 // Loop over all of the global variables, making corresponding globals in the
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50 // new module. Here we add them to the VMap and to the new Module. We
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51 // don't worry about attributes or initializers, they will come later.
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52 //
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53 for (Module::const_global_iterator I = M->global_begin(), E = M->global_end();
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54 I != E; ++I) {
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55 GlobalVariable *GV = new GlobalVariable(*New,
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56 I->getValueType(),
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57 I->isConstant(), I->getLinkage(),
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58 (Constant*) nullptr, I->getName(),
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59 (GlobalVariable*) nullptr,
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60 I->getThreadLocalMode(),
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61 I->getType()->getAddressSpace());
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62 GV->copyAttributesFrom(&*I);
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63 VMap[&*I] = GV;
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64 }
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65
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66 // Loop over the functions in the module, making external functions as before
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67 for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I) {
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68 Function *NF =
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69 Function::Create(cast<FunctionType>(I->getValueType()),
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70 I->getLinkage(), I->getName(), New.get());
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71 NF->copyAttributesFrom(&*I);
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72 VMap[&*I] = NF;
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73 }
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74
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75 // Loop over the aliases in the module
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76 for (Module::const_alias_iterator I = M->alias_begin(), E = M->alias_end();
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77 I != E; ++I) {
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78 if (!ShouldCloneDefinition(&*I)) {
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79 // An alias cannot act as an external reference, so we need to create
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80 // either a function or a global variable depending on the value type.
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81 // FIXME: Once pointee types are gone we can probably pick one or the
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82 // other.
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83 GlobalValue *GV;
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84 if (I->getValueType()->isFunctionTy())
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85 GV = Function::Create(cast<FunctionType>(I->getValueType()),
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86 GlobalValue::ExternalLinkage, I->getName(),
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87 New.get());
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88 else
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89 GV = new GlobalVariable(
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90 *New, I->getValueType(), false, GlobalValue::ExternalLinkage,
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91 (Constant *)nullptr, I->getName(), (GlobalVariable *)nullptr,
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92 I->getThreadLocalMode(), I->getType()->getAddressSpace());
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93 VMap[&*I] = GV;
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94 // We do not copy attributes (mainly because copying between different
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95 // kinds of globals is forbidden), but this is generally not required for
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96 // correctness.
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97 continue;
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98 }
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99 auto *GA = GlobalAlias::create(I->getValueType(),
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100 I->getType()->getPointerAddressSpace(),
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101 I->getLinkage(), I->getName(), New.get());
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102 GA->copyAttributesFrom(&*I);
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103 VMap[&*I] = GA;
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104 }
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105
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106 // Now that all of the things that global variable initializer can refer to
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107 // have been created, loop through and copy the global variable referrers
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108 // over... We also set the attributes on the global now.
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109 //
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110 for (Module::const_global_iterator I = M->global_begin(), E = M->global_end();
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111 I != E; ++I) {
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112 GlobalVariable *GV = cast<GlobalVariable>(VMap[&*I]);
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113 if (!ShouldCloneDefinition(&*I)) {
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114 // Skip after setting the correct linkage for an external reference.
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115 GV->setLinkage(GlobalValue::ExternalLinkage);
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116 continue;
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117 }
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118 if (I->hasInitializer())
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119 GV->setInitializer(MapValue(I->getInitializer(), VMap));
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120 }
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121
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122 // Similarly, copy over function bodies now...
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123 //
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124 for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I) {
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125 Function *F = cast<Function>(VMap[&*I]);
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126 if (!ShouldCloneDefinition(&*I)) {
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127 // Skip after setting the correct linkage for an external reference.
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128 F->setLinkage(GlobalValue::ExternalLinkage);
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129 continue;
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130 }
0
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131 if (!I->isDeclaration()) {
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132 Function::arg_iterator DestI = F->arg_begin();
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133 for (Function::const_arg_iterator J = I->arg_begin(); J != I->arg_end();
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134 ++J) {
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135 DestI->setName(J->getName());
95
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136 VMap[&*J] = &*DestI++;
0
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137 }
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138
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139 SmallVector<ReturnInst*, 8> Returns; // Ignore returns cloned.
95
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140 CloneFunctionInto(F, &*I, VMap, /*ModuleLevelChanges=*/true, Returns);
0
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141 }
95
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142
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143 if (I->hasPersonalityFn())
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144 F->setPersonalityFn(MapValue(I->getPersonalityFn(), VMap));
0
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145 }
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146
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147 // And aliases
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148 for (Module::const_alias_iterator I = M->alias_begin(), E = M->alias_end();
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149 I != E; ++I) {
95
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150 // We already dealt with undefined aliases above.
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diff changeset
151 if (!ShouldCloneDefinition(&*I))
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diff changeset
152 continue;
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diff changeset
153 GlobalAlias *GA = cast<GlobalAlias>(VMap[&*I]);
0
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154 if (const Constant *C = I->getAliasee())
83
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diff changeset
155 GA->setAliasee(MapValue(C, VMap));
0
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156 }
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parents:
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157
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158 // And named metadata....
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159 for (Module::const_named_metadata_iterator I = M->named_metadata_begin(),
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diff changeset
160 E = M->named_metadata_end(); I != E; ++I) {
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diff changeset
161 const NamedMDNode &NMD = *I;
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162 NamedMDNode *NewNMD = New->getOrInsertNamedMetadata(NMD.getName());
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parents:
diff changeset
163 for (unsigned i = 0, e = NMD.getNumOperands(); i != e; ++i)
83
60c9769439b8 LLVM 3.7
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diff changeset
164 NewNMD->addOperand(MapMetadata(NMD.getOperand(i), VMap));
0
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165 }
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parents:
diff changeset
166
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parents:
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167 return New;
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parents:
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168 }
83
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diff changeset
169
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diff changeset
170 extern "C" {
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diff changeset
171
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diff changeset
172 LLVMModuleRef LLVMCloneModule(LLVMModuleRef M) {
100
7d135dc70f03 LLVM 3.9
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parents: 95
diff changeset
173 return wrap(CloneModule(unwrap(M)).release());
83
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diff changeset
174 }
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parents: 77
diff changeset
175
60c9769439b8 LLVM 3.7
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parents: 77
diff changeset
176 }