annotate lib/Transforms/Utils/CloneModule.cpp @ 83:60c9769439b8

LLVM 3.7
author Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
date Wed, 18 Feb 2015 14:55:36 +0900
parents 54457678186b
children afa8332a0e37
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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 // First off, we need to create the new module.
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37 Module *New = new Module(M->getModuleIdentifier(), M->getContext());
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38 New->setDataLayout(M->getDataLayout());
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39 New->setTargetTriple(M->getTargetTriple());
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40 New->setModuleInlineAsm(M->getModuleInlineAsm());
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41
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42 // Loop over all of the global variables, making corresponding globals in the
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43 // new module. Here we add them to the VMap and to the new Module. We
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44 // don't worry about attributes or initializers, they will come later.
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45 //
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46 for (Module::const_global_iterator I = M->global_begin(), E = M->global_end();
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47 I != E; ++I) {
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48 GlobalVariable *GV = new GlobalVariable(*New,
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49 I->getType()->getElementType(),
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50 I->isConstant(), I->getLinkage(),
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51 (Constant*) nullptr, I->getName(),
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52 (GlobalVariable*) nullptr,
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53 I->getThreadLocalMode(),
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54 I->getType()->getAddressSpace());
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55 GV->copyAttributesFrom(I);
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56 VMap[I] = GV;
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57 }
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58
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59 // Loop over the functions in the module, making external functions as before
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60 for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I) {
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61 Function *NF =
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62 Function::Create(cast<FunctionType>(I->getType()->getElementType()),
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63 I->getLinkage(), I->getName(), New);
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64 NF->copyAttributesFrom(I);
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65 VMap[I] = NF;
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66 }
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67
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68 // Loop over the aliases in the module
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69 for (Module::const_alias_iterator I = M->alias_begin(), E = M->alias_end();
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70 I != E; ++I) {
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71 auto *PTy = cast<PointerType>(I->getType());
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72 auto *GA =
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73 GlobalAlias::create(PTy->getElementType(), PTy->getAddressSpace(),
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74 I->getLinkage(), I->getName(), New);
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75 GA->copyAttributesFrom(I);
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76 VMap[I] = GA;
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77 }
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78
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79 // Now that all of the things that global variable initializer can refer to
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80 // have been created, loop through and copy the global variable referrers
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81 // over... We also set the attributes on the global now.
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82 //
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83 for (Module::const_global_iterator I = M->global_begin(), E = M->global_end();
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84 I != E; ++I) {
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85 GlobalVariable *GV = cast<GlobalVariable>(VMap[I]);
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86 if (I->hasInitializer())
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87 GV->setInitializer(MapValue(I->getInitializer(), VMap));
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88 }
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89
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90 // Similarly, copy over function bodies now...
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91 //
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92 for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I) {
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93 Function *F = cast<Function>(VMap[I]);
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94 if (!I->isDeclaration()) {
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95 Function::arg_iterator DestI = F->arg_begin();
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96 for (Function::const_arg_iterator J = I->arg_begin(); J != I->arg_end();
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97 ++J) {
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98 DestI->setName(J->getName());
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99 VMap[J] = DestI++;
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100 }
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101
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102 SmallVector<ReturnInst*, 8> Returns; // Ignore returns cloned.
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103 CloneFunctionInto(F, I, VMap, /*ModuleLevelChanges=*/true, Returns);
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104 }
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105 }
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106
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107 // And aliases
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108 for (Module::const_alias_iterator I = M->alias_begin(), E = M->alias_end();
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109 I != E; ++I) {
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110 GlobalAlias *GA = cast<GlobalAlias>(VMap[I]);
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111 if (const Constant *C = I->getAliasee())
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112 GA->setAliasee(MapValue(C, VMap));
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113 }
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114
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115 // And named metadata....
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116 for (Module::const_named_metadata_iterator I = M->named_metadata_begin(),
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117 E = M->named_metadata_end(); I != E; ++I) {
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118 const NamedMDNode &NMD = *I;
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119 NamedMDNode *NewNMD = New->getOrInsertNamedMetadata(NMD.getName());
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120 for (unsigned i = 0, e = NMD.getNumOperands(); i != e; ++i)
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121 NewNMD->addOperand(MapMetadata(NMD.getOperand(i), VMap));
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122 }
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123
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124 return New;
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125 }
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126
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127 extern "C" {
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128
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parents: 77
diff changeset
129 LLVMModuleRef LLVMCloneModule(LLVMModuleRef M) {
60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
parents: 77
diff changeset
130 return wrap(CloneModule(unwrap(M)));
60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
parents: 77
diff changeset
131 }
60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
parents: 77
diff changeset
132
60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
parents: 77
diff changeset
133 }