PageRenderTime 31ms CodeModel.GetById 17ms app.highlight 12ms RepoModel.GetById 0ms app.codeStats 0ms

/3rd_party/llvm/lib/Transforms/Utils/CloneModule.cpp

https://code.google.com/p/softart/
C++ | 122 lines | 75 code | 12 blank | 35 comment | 21 complexity | 0e5d72439272f00d2369f94736422d01 MD5 | raw file
Possible License(s): LGPL-2.1, BSD-3-Clause, JSON, MPL-2.0-no-copyleft-exception, GPL-2.0, GPL-3.0, LGPL-3.0, BSD-2-Clause
  1//===- CloneModule.cpp - Clone an entire module ---------------------------===//
  2//
  3//                     The LLVM Compiler Infrastructure
  4//
  5// This file is distributed under the University of Illinois Open Source
  6// License. See LICENSE.TXT for details.
  7//
  8//===----------------------------------------------------------------------===//
  9//
 10// This file implements the CloneModule interface which makes a copy of an
 11// entire module.
 12//
 13//===----------------------------------------------------------------------===//
 14
 15#include "llvm/Transforms/Utils/Cloning.h"
 16#include "llvm/IR/Constant.h"
 17#include "llvm/IR/DerivedTypes.h"
 18#include "llvm/IR/Module.h"
 19#include "llvm/Transforms/Utils/ValueMapper.h"
 20using namespace llvm;
 21
 22/// CloneModule - Return an exact copy of the specified module.  This is not as
 23/// easy as it might seem because we have to worry about making copies of global
 24/// variables and functions, and making their (initializers and references,
 25/// respectively) refer to the right globals.
 26///
 27Module *llvm::CloneModule(const Module *M) {
 28  // Create the value map that maps things from the old module over to the new
 29  // module.
 30  ValueToValueMapTy VMap;
 31  return CloneModule(M, VMap);
 32}
 33
 34Module *llvm::CloneModule(const Module *M, ValueToValueMapTy &VMap) {
 35  // First off, we need to create the new module.
 36  Module *New = new Module(M->getModuleIdentifier(), M->getContext());
 37  New->setDataLayout(M->getDataLayout());
 38  New->setTargetTriple(M->getTargetTriple());
 39  New->setModuleInlineAsm(M->getModuleInlineAsm());
 40   
 41  // Loop over all of the global variables, making corresponding globals in the
 42  // new module.  Here we add them to the VMap and to the new Module.  We
 43  // don't worry about attributes or initializers, they will come later.
 44  //
 45  for (Module::const_global_iterator I = M->global_begin(), E = M->global_end();
 46       I != E; ++I) {
 47    GlobalVariable *GV = new GlobalVariable(*New, 
 48                                            I->getType()->getElementType(),
 49                                            I->isConstant(), I->getLinkage(),
 50                                            (Constant*) 0, I->getName(),
 51                                            (GlobalVariable*) 0,
 52                                            I->getThreadLocalMode(),
 53                                            I->getType()->getAddressSpace());
 54    GV->copyAttributesFrom(I);
 55    VMap[I] = GV;
 56  }
 57
 58  // Loop over the functions in the module, making external functions as before
 59  for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I) {
 60    Function *NF =
 61      Function::Create(cast<FunctionType>(I->getType()->getElementType()),
 62                       I->getLinkage(), I->getName(), New);
 63    NF->copyAttributesFrom(I);
 64    VMap[I] = NF;
 65  }
 66
 67  // Loop over the aliases in the module
 68  for (Module::const_alias_iterator I = M->alias_begin(), E = M->alias_end();
 69       I != E; ++I) {
 70    GlobalAlias *GA = new GlobalAlias(I->getType(), I->getLinkage(),
 71                                      I->getName(), NULL, New);
 72    GA->copyAttributesFrom(I);
 73    VMap[I] = GA;
 74  }
 75  
 76  // Now that all of the things that global variable initializer can refer to
 77  // have been created, loop through and copy the global variable referrers
 78  // over...  We also set the attributes on the global now.
 79  //
 80  for (Module::const_global_iterator I = M->global_begin(), E = M->global_end();
 81       I != E; ++I) {
 82    GlobalVariable *GV = cast<GlobalVariable>(VMap[I]);
 83    if (I->hasInitializer())
 84      GV->setInitializer(MapValue(I->getInitializer(), VMap));
 85  }
 86
 87  // Similarly, copy over function bodies now...
 88  //
 89  for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I) {
 90    Function *F = cast<Function>(VMap[I]);
 91    if (!I->isDeclaration()) {
 92      Function::arg_iterator DestI = F->arg_begin();
 93      for (Function::const_arg_iterator J = I->arg_begin(); J != I->arg_end();
 94           ++J) {
 95        DestI->setName(J->getName());
 96        VMap[J] = DestI++;
 97      }
 98
 99      SmallVector<ReturnInst*, 8> Returns;  // Ignore returns cloned.
100      CloneFunctionInto(F, I, VMap, /*ModuleLevelChanges=*/true, Returns);
101    }
102  }
103
104  // And aliases
105  for (Module::const_alias_iterator I = M->alias_begin(), E = M->alias_end();
106       I != E; ++I) {
107    GlobalAlias *GA = cast<GlobalAlias>(VMap[I]);
108    if (const Constant *C = I->getAliasee())
109      GA->setAliasee(MapValue(C, VMap));
110  }
111
112  // And named metadata....
113  for (Module::const_named_metadata_iterator I = M->named_metadata_begin(),
114         E = M->named_metadata_end(); I != E; ++I) {
115    const NamedMDNode &NMD = *I;
116    NamedMDNode *NewNMD = New->getOrInsertNamedMetadata(NMD.getName());
117    for (unsigned i = 0, e = NMD.getNumOperands(); i != e; ++i)
118      NewNMD->addOperand(MapValue(NMD.getOperand(i), VMap));
119  }
120
121  return New;
122}