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(M->getModuleIdentifier());
22 New->setEndianness(M->getEndianness());
23 New->setPointerSize(M->getPointerSize());
25 // Create the value map that maps things from the old module over to the new
27 std::map<const Value*, Value*> ValueMap;
29 // Loop over all of the global variables, making corresponding globals in the
30 // new module. Here we add them to the ValueMap and to the new Module. We
31 // don't worry about attributes or initializers, they will come later.
33 for (Module::const_giterator I = M->gbegin(), E = M->gend(); I != E; ++I)
34 ValueMap[I] = new GlobalVariable(I->getType()->getElementType(), false,
35 GlobalValue::ExternalLinkage, 0,
38 // Loop over the functions in the module, making external functions as before
39 for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I)
40 ValueMap[I]=new Function(cast<FunctionType>(I->getType()->getElementType()),
41 GlobalValue::ExternalLinkage, I->getName(), New);
43 // Now that all of the things that global variable initializer can refer to
44 // have been created, loop through and copy the global variable referrers
45 // over... We also set the attributes on the global now.
47 for (Module::const_giterator I = M->gbegin(), E = M->gend(); I != E; ++I) {
48 GlobalVariable *GV = cast<GlobalVariable>(ValueMap[I]);
49 if (I->hasInitializer())
50 GV->setInitializer(cast<Constant>(MapValue(I->getInitializer(),
52 GV->setLinkage(I->getLinkage());
55 // Similarly, copy over function bodies now...
57 for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I) {
58 Function *F = cast<Function>(ValueMap[I]);
59 if (!I->isExternal()) {
60 Function::aiterator DestI = F->abegin();
61 for (Function::const_aiterator J = I->abegin(); J != I->aend(); ++J) {
62 DestI->setName(J->getName());
63 ValueMap[J] = DestI++;
66 std::vector<ReturnInst*> Returns; // Ignore returns cloned...
67 CloneFunctionInto(F, I, ValueMap, Returns);
70 F->setLinkage(I->getLinkage());