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 // Create the value map that maps things from the old module over to the new 00030 // module. 00031 std::map<const Value*, Value*> ValueMap; 00032 00033 return CloneModule(M, ValueMap); 00034 } 00035 00036 Module *llvm::CloneModule(const Module *M, std::map<const Value*, Value*> &ValueMap) { 00037 // First off, we need to create the new module... 00038 Module *New = new Module(M->getModuleIdentifier()); 00039 New->setEndianness(M->getEndianness()); 00040 New->setPointerSize(M->getPointerSize()); 00041 New->setTargetTriple(M->getTargetTriple()); 00042 New->setModuleInlineAsm(M->getModuleInlineAsm()); 00043 00044 // Copy all of the type symbol table entries over. 00045 const SymbolTable &SymTab = M->getSymbolTable(); 00046 SymbolTable::type_const_iterator TypeI = SymTab.type_begin(); 00047 SymbolTable::type_const_iterator TypeE = SymTab.type_end(); 00048 for (; TypeI != TypeE; ++TypeI) 00049 New->addTypeName(TypeI->first, TypeI->second); 00050 00051 // Copy all of the dependent libraries over. 00052 for (Module::lib_iterator I = M->lib_begin(), E = M->lib_end(); I != E; ++I) 00053 New->addLibrary(*I); 00054 00055 // Loop over all of the global variables, making corresponding globals in the 00056 // new module. Here we add them to the ValueMap and to the new Module. We 00057 // don't worry about attributes or initializers, they will come later. 00058 // 00059 for (Module::const_global_iterator I = M->global_begin(), E = M->global_end(); 00060 I != E; ++I) 00061 ValueMap[I] = new GlobalVariable(I->getType()->getElementType(), false, 00062 GlobalValue::ExternalLinkage, 0, 00063 I->getName(), New); 00064 00065 // Loop over the functions in the module, making external functions as before 00066 for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I) { 00067 Function *NF = 00068 new Function(cast<FunctionType>(I->getType()->getElementType()), 00069 GlobalValue::ExternalLinkage, I->getName(), New); 00070 NF->setCallingConv(I->getCallingConv()); 00071 ValueMap[I]= NF; 00072 } 00073 00074 // Now that all of the things that global variable initializer can refer to 00075 // have been created, loop through and copy the global variable referrers 00076 // over... We also set the attributes on the global now. 00077 // 00078 for (Module::const_global_iterator I = M->global_begin(), E = M->global_end(); 00079 I != E; ++I) { 00080 GlobalVariable *GV = cast<GlobalVariable>(ValueMap[I]); 00081 if (I->hasInitializer()) 00082 GV->setInitializer(cast<Constant>(MapValue(I->getInitializer(), 00083 ValueMap))); 00084 GV->setLinkage(I->getLinkage()); 00085 } 00086 00087 // Similarly, copy over function bodies now... 00088 // 00089 for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I) { 00090 Function *F = cast<Function>(ValueMap[I]); 00091 if (!I->isExternal()) { 00092 Function::arg_iterator DestI = F->arg_begin(); 00093 for (Function::const_arg_iterator J = I->arg_begin(); J != I->arg_end(); 00094 ++J) { 00095 DestI->setName(J->getName()); 00096 ValueMap[J] = DestI++; 00097 } 00098 00099 std::vector<ReturnInst*> Returns; // Ignore returns cloned... 00100 CloneFunctionInto(F, I, ValueMap, Returns); 00101 } 00102 00103 F->setLinkage(I->getLinkage()); 00104 } 00105 00106 return New; 00107 } 00108 00109 // vim: sw=2