LLVM API Documentation
00001 //===- CloneModule.cpp - Clone an entire module ---------------------------===// 00002 // 00003 // The LLVM Compiler Infrastructure 00004 // 00005 // This file was developed by the LLVM research group and is distributed under 00006 // the University of Illinois Open Source License. See LICENSE.TXT for details. 00007 // 00008 //===----------------------------------------------------------------------===// 00009 // 00010 // This file implements the CloneModule interface which makes a copy of an 00011 // entire module. 00012 // 00013 //===----------------------------------------------------------------------===// 00014 00015 #include "llvm/Transforms/Utils/Cloning.h" 00016 #include "llvm/Module.h" 00017 #include "llvm/DerivedTypes.h" 00018 #include "llvm/SymbolTable.h" 00019 #include "llvm/Constant.h" 00020 #include "ValueMapper.h" 00021 using namespace llvm; 00022 00023 /// CloneModule - Return an exact copy of the specified module. This is not as 00024 /// easy as it might seem because we have to worry about making copies of global 00025 /// variables and functions, and making their (initializers and references, 00026 /// respectively) refer to the right globals. 00027 /// 00028 Module *llvm::CloneModule(const Module *M) { 00029 // First off, we need to create the new module... 00030 Module *New = new Module(M->getModuleIdentifier()); 00031 New->setEndianness(M->getEndianness()); 00032 New->setPointerSize(M->getPointerSize()); 00033 00034 // Copy all of the type symbol table entries over... 00035 const SymbolTable &SymTab = M->getSymbolTable(); 00036 SymbolTable::type_const_iterator TypeI = SymTab.type_begin(); 00037 SymbolTable::type_const_iterator TypeE = SymTab.type_end(); 00038 for ( ; TypeI != TypeE; ++TypeI ) { 00039 New->addTypeName(TypeI->first, TypeI->second); 00040 } 00041 00042 // Create the value map that maps things from the old module over to the new 00043 // module. 00044 std::map<const Value*, Value*> ValueMap; 00045 00046 // Loop over all of the global variables, making corresponding globals in the 00047 // new module. Here we add them to the ValueMap and to the new Module. We 00048 // don't worry about attributes or initializers, they will come later. 00049 // 00050 for (Module::const_giterator I = M->gbegin(), E = M->gend(); I != E; ++I) 00051 ValueMap[I] = new GlobalVariable(I->getType()->getElementType(), false, 00052 GlobalValue::ExternalLinkage, 0, 00053 I->getName(), New); 00054 00055 // Loop over the functions in the module, making external functions as before 00056 for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I) 00057 ValueMap[I]=new Function(cast<FunctionType>(I->getType()->getElementType()), 00058 GlobalValue::ExternalLinkage, I->getName(), New); 00059 00060 // Now that all of the things that global variable initializer can refer to 00061 // have been created, loop through and copy the global variable referrers 00062 // over... We also set the attributes on the global now. 00063 // 00064 for (Module::const_giterator I = M->gbegin(), E = M->gend(); I != E; ++I) { 00065 GlobalVariable *GV = cast<GlobalVariable>(ValueMap[I]); 00066 if (I->hasInitializer()) 00067 GV->setInitializer(cast<Constant>(MapValue(I->getInitializer(), 00068 ValueMap))); 00069 GV->setLinkage(I->getLinkage()); 00070 } 00071 00072 // Similarly, copy over function bodies now... 00073 // 00074 for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I) { 00075 Function *F = cast<Function>(ValueMap[I]); 00076 if (!I->isExternal()) { 00077 Function::aiterator DestI = F->abegin(); 00078 for (Function::const_aiterator J = I->abegin(); J != I->aend(); ++J) { 00079 DestI->setName(J->getName()); 00080 ValueMap[J] = DestI++; 00081 } 00082 00083 std::vector<ReturnInst*> Returns; // Ignore returns cloned... 00084 CloneFunctionInto(F, I, ValueMap, Returns); 00085 } 00086 00087 F->setLinkage(I->getLinkage()); 00088 } 00089 00090 return New; 00091 } 00092 00093 // vim: sw=2