1 //===- CloneModule.cpp - Clone an entire module ---------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the CloneModule interface which makes a copy of an
13 //===----------------------------------------------------------------------===//
15 #include "llvm/Transforms/Utils/Cloning.h"
16 #include "llvm/Module.h"
17 #include "llvm/DerivedTypes.h"
18 #include "llvm/SymbolTable.h"
19 #include "llvm/Constant.h"
20 #include "ValueMapper.h"
23 /// CloneModule - Return an exact copy of the specified module. This is not as
24 /// easy as it might seem because we have to worry about making copies of global
25 /// variables and functions, and making their (initializers and references,
26 /// respectively) refer to the right globals.
28 Module *llvm::CloneModule(const Module *M) {
29 // First off, we need to create the new module...
30 Module *New = new Module(M->getModuleIdentifier());
31 New->setEndianness(M->getEndianness());
32 New->setPointerSize(M->getPointerSize());
34 // Copy all of the type symbol table entries over...
35 const SymbolTable &SymTab = M->getSymbolTable();
36 SymbolTable::type_const_iterator TypeI = SymTab.type_begin();
37 SymbolTable::type_const_iterator TypeE = SymTab.type_end();
38 for ( ; TypeI != TypeE; ++TypeI ) {
39 New->addTypeName(TypeI->first, TypeI->second);
42 // Create the value map that maps things from the old module over to the new
44 std::map<const Value*, Value*> ValueMap;
46 // Loop over all of the global variables, making corresponding globals in the
47 // new module. Here we add them to the ValueMap and to the new Module. We
48 // don't worry about attributes or initializers, they will come later.
50 for (Module::const_global_iterator I = M->global_begin(), E = M->global_end();
52 ValueMap[I] = new GlobalVariable(I->getType()->getElementType(), false,
53 GlobalValue::ExternalLinkage, 0,
56 // Loop over the functions in the module, making external functions as before
57 for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I) {
59 new Function(cast<FunctionType>(I->getType()->getElementType()),
60 GlobalValue::ExternalLinkage, I->getName(), New);
61 NF->setCallingConv(I->getCallingConv());
65 // Now that all of the things that global variable initializer can refer to
66 // have been created, loop through and copy the global variable referrers
67 // over... We also set the attributes on the global now.
69 for (Module::const_global_iterator I = M->global_begin(), E = M->global_end();
71 GlobalVariable *GV = cast<GlobalVariable>(ValueMap[I]);
72 if (I->hasInitializer())
73 GV->setInitializer(cast<Constant>(MapValue(I->getInitializer(),
75 GV->setLinkage(I->getLinkage());
78 // Similarly, copy over function bodies now...
80 for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I) {
81 Function *F = cast<Function>(ValueMap[I]);
82 if (!I->isExternal()) {
83 Function::arg_iterator DestI = F->arg_begin();
84 for (Function::const_arg_iterator J = I->arg_begin(); J != I->arg_end();
86 DestI->setName(J->getName());
87 ValueMap[J] = DestI++;
90 std::vector<ReturnInst*> Returns; // Ignore returns cloned...
91 CloneFunctionInto(F, I, ValueMap, Returns);
94 F->setLinkage(I->getLinkage());