1 //===- CloneModule.cpp - Clone an entire module ---------------------------===//
3 // This file implements the CloneModule interface which makes a copy of an
6 //===----------------------------------------------------------------------===//
8 #include "llvm/Transforms/Utils/Cloning.h"
9 #include "llvm/Module.h"
10 #include "llvm/DerivedTypes.h"
11 #include "llvm/Constant.h"
12 #include "ValueMapper.h"
14 /// CloneModule - Return an exact copy of the specified module. This is not as
15 /// easy as it might seem because we have to worry about making copies of global
16 /// variables and functions, and making their (intializers and references,
17 /// respectively) refer to the right globals.
19 Module *CloneModule(const Module *M) {
20 // First off, we need to create the new module...
21 Module *New = new Module();
23 // Create the value map that maps things from the old module over to the new
25 std::map<const Value*, Value*> ValueMap;
27 // Loop over all of the global variables, making corresponding globals in the
28 // new module. Here we add them to the ValueMap and to the new Module. We
29 // don't worry about attributes or initializers, they will come later.
31 for (Module::const_giterator I = M->gbegin(), E = M->gend(); I != E; ++I)
32 ValueMap[I] = new GlobalVariable(I->getType()->getElementType(), false,
33 GlobalValue::ExternalLinkage, 0,
36 // Loop over the functions in the module, making external functions as before
37 for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I)
38 ValueMap[I]=new Function(cast<FunctionType>(I->getType()->getElementType()),
39 GlobalValue::ExternalLinkage, I->getName(), New);
41 // Now that all of the things that global variable initializer can refer to
42 // have been created, loop through and copy the global variable referrers
43 // over... We also set the attributes on the global now.
45 for (Module::const_giterator I = M->gbegin(), E = M->gend(); I != E; ++I) {
46 GlobalVariable *GV = cast<GlobalVariable>(ValueMap[I]);
47 if (I->hasInitializer())
48 GV->setInitializer(cast<Constant>(MapValue(I->getInitializer(),
50 GV->setLinkage(I->getLinkage());
53 // Similarly, copy over function bodies now...
55 for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I) {
56 Function *F = cast<Function>(ValueMap[I]);
57 if (!I->isExternal()) {
58 Function::aiterator DestI = F->abegin();
59 for (Function::const_aiterator J = I->abegin(); J != I->aend(); ++J) {
60 DestI->setName(J->getName());
61 ValueMap[J] = DestI++;
64 std::vector<ReturnInst*> Returns; // Ignore returns cloned...
65 CloneFunctionInto(F, I, ValueMap, Returns);
68 F->setLinkage(I->getLinkage());