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annotate lib/Transforms/Utils/CloneModule.cpp @ 77:54457678186b

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LLVM 3.6
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Mon, 08 Sep 2014 22:06:00 +0900
parents 95c75e76d11b
children 60c9769439b8
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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 using namespace llvm;
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21
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22 /// CloneModule - Return an exact copy of the specified module. This is not as
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23 /// easy as it might seem because we have to worry about making copies of global
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24 /// variables and functions, and making their (initializers and references,
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25 /// respectively) refer to the right globals.
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26 ///
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27 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 Module *llvm::CloneModule(const Module *M, ValueToValueMapTy &VMap) {
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35 // First off, we need to create the new module.
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36 Module *New = new Module(M->getModuleIdentifier(), M->getContext());
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37 New->setDataLayout(M->getDataLayout());
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38 New->setTargetTriple(M->getTargetTriple());
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39 New->setModuleInlineAsm(M->getModuleInlineAsm());
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40
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41 // Loop over all of the global variables, making corresponding globals in the
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42 // new module. Here we add them to the VMap and to the new Module. We
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43 // don't worry about attributes or initializers, they will come later.
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44 //
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45 for (Module::const_global_iterator I = M->global_begin(), E = M->global_end();
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46 I != E; ++I) {
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47 GlobalVariable *GV = new GlobalVariable(*New,
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48 I->getType()->getElementType(),
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49 I->isConstant(), I->getLinkage(),
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50 (Constant*) nullptr, I->getName(),
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51 (GlobalVariable*) nullptr,
0
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52 I->getThreadLocalMode(),
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53 I->getType()->getAddressSpace());
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54 GV->copyAttributesFrom(I);
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55 VMap[I] = GV;
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56 }
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57
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58 // Loop over the functions in the module, making external functions as before
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59 for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I) {
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60 Function *NF =
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61 Function::Create(cast<FunctionType>(I->getType()->getElementType()),
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62 I->getLinkage(), I->getName(), New);
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63 NF->copyAttributesFrom(I);
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64 VMap[I] = NF;
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65 }
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66
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67 // Loop over the aliases in the module
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68 for (Module::const_alias_iterator I = M->alias_begin(), E = M->alias_end();
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69 I != E; ++I) {
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70 auto *PTy = cast<PointerType>(I->getType());
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71 auto *GA =
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72 GlobalAlias::create(PTy->getElementType(), PTy->getAddressSpace(),
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73 I->getLinkage(), I->getName(), New);
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74 GA->copyAttributesFrom(I);
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75 VMap[I] = GA;
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76 }
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77
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78 // Now that all of the things that global variable initializer can refer to
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79 // have been created, loop through and copy the global variable referrers
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80 // over... We also set the attributes on the global now.
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81 //
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82 for (Module::const_global_iterator I = M->global_begin(), E = M->global_end();
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83 I != E; ++I) {
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84 GlobalVariable *GV = cast<GlobalVariable>(VMap[I]);
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85 if (I->hasInitializer())
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86 GV->setInitializer(MapValue(I->getInitializer(), VMap));
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87 }
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88
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89 // Similarly, copy over function bodies now...
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90 //
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91 for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I) {
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92 Function *F = cast<Function>(VMap[I]);
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93 if (!I->isDeclaration()) {
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94 Function::arg_iterator DestI = F->arg_begin();
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95 for (Function::const_arg_iterator J = I->arg_begin(); J != I->arg_end();
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96 ++J) {
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97 DestI->setName(J->getName());
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98 VMap[J] = DestI++;
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99 }
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100
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101 SmallVector<ReturnInst*, 8> Returns; // Ignore returns cloned.
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102 CloneFunctionInto(F, I, VMap, /*ModuleLevelChanges=*/true, Returns);
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103 }
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104 }
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105
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106 // And aliases
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107 for (Module::const_alias_iterator I = M->alias_begin(), E = M->alias_end();
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108 I != E; ++I) {
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109 GlobalAlias *GA = cast<GlobalAlias>(VMap[I]);
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110 if (const Constant *C = I->getAliasee())
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111 GA->setAliasee(cast<GlobalObject>(MapValue(C, VMap)));
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112 }
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113
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114 // And named metadata....
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115 for (Module::const_named_metadata_iterator I = M->named_metadata_begin(),
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116 E = M->named_metadata_end(); I != E; ++I) {
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117 const NamedMDNode &NMD = *I;
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118 NamedMDNode *NewNMD = New->getOrInsertNamedMetadata(NMD.getName());
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119 for (unsigned i = 0, e = NMD.getNumOperands(); i != e; ++i)
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120 NewNMD->addOperand(MapValue(NMD.getOperand(i), VMap));
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121 }
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122
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123 return New;
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124 }