/3rd_party/llvm/lib/Transforms/Utils/CloneModule.cpp
https://code.google.com/p/softart/ · C++ · 122 lines · 75 code · 12 blank · 35 comment · 21 complexity · 0e5d72439272f00d2369f94736422d01 MD5 · raw file
- //===- CloneModule.cpp - Clone an entire module ---------------------------===//
- //
- // The LLVM Compiler Infrastructure
- //
- // This file is distributed under the University of Illinois Open Source
- // License. See LICENSE.TXT for details.
- //
- //===----------------------------------------------------------------------===//
- //
- // This file implements the CloneModule interface which makes a copy of an
- // entire module.
- //
- //===----------------------------------------------------------------------===//
- #include "llvm/Transforms/Utils/Cloning.h"
- #include "llvm/IR/Constant.h"
- #include "llvm/IR/DerivedTypes.h"
- #include "llvm/IR/Module.h"
- #include "llvm/Transforms/Utils/ValueMapper.h"
- using namespace llvm;
- /// CloneModule - Return an exact copy of the specified module. This is not as
- /// easy as it might seem because we have to worry about making copies of global
- /// variables and functions, and making their (initializers and references,
- /// respectively) refer to the right globals.
- ///
- Module *llvm::CloneModule(const Module *M) {
- // Create the value map that maps things from the old module over to the new
- // module.
- ValueToValueMapTy VMap;
- return CloneModule(M, VMap);
- }
- Module *llvm::CloneModule(const Module *M, ValueToValueMapTy &VMap) {
- // First off, we need to create the new module.
- Module *New = new Module(M->getModuleIdentifier(), M->getContext());
- New->setDataLayout(M->getDataLayout());
- New->setTargetTriple(M->getTargetTriple());
- New->setModuleInlineAsm(M->getModuleInlineAsm());
-
- // Loop over all of the global variables, making corresponding globals in the
- // new module. Here we add them to the VMap and to the new Module. We
- // don't worry about attributes or initializers, they will come later.
- //
- for (Module::const_global_iterator I = M->global_begin(), E = M->global_end();
- I != E; ++I) {
- GlobalVariable *GV = new GlobalVariable(*New,
- I->getType()->getElementType(),
- I->isConstant(), I->getLinkage(),
- (Constant*) 0, I->getName(),
- (GlobalVariable*) 0,
- I->getThreadLocalMode(),
- I->getType()->getAddressSpace());
- GV->copyAttributesFrom(I);
- VMap[I] = GV;
- }
- // Loop over the functions in the module, making external functions as before
- for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I) {
- Function *NF =
- Function::Create(cast<FunctionType>(I->getType()->getElementType()),
- I->getLinkage(), I->getName(), New);
- NF->copyAttributesFrom(I);
- VMap[I] = NF;
- }
- // Loop over the aliases in the module
- for (Module::const_alias_iterator I = M->alias_begin(), E = M->alias_end();
- I != E; ++I) {
- GlobalAlias *GA = new GlobalAlias(I->getType(), I->getLinkage(),
- I->getName(), NULL, New);
- GA->copyAttributesFrom(I);
- VMap[I] = GA;
- }
-
- // Now that all of the things that global variable initializer can refer to
- // have been created, loop through and copy the global variable referrers
- // over... We also set the attributes on the global now.
- //
- for (Module::const_global_iterator I = M->global_begin(), E = M->global_end();
- I != E; ++I) {
- GlobalVariable *GV = cast<GlobalVariable>(VMap[I]);
- if (I->hasInitializer())
- GV->setInitializer(MapValue(I->getInitializer(), VMap));
- }
- // Similarly, copy over function bodies now...
- //
- for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I) {
- Function *F = cast<Function>(VMap[I]);
- if (!I->isDeclaration()) {
- Function::arg_iterator DestI = F->arg_begin();
- for (Function::const_arg_iterator J = I->arg_begin(); J != I->arg_end();
- ++J) {
- DestI->setName(J->getName());
- VMap[J] = DestI++;
- }
- SmallVector<ReturnInst*, 8> Returns; // Ignore returns cloned.
- CloneFunctionInto(F, I, VMap, /*ModuleLevelChanges=*/true, Returns);
- }
- }
- // And aliases
- for (Module::const_alias_iterator I = M->alias_begin(), E = M->alias_end();
- I != E; ++I) {
- GlobalAlias *GA = cast<GlobalAlias>(VMap[I]);
- if (const Constant *C = I->getAliasee())
- GA->setAliasee(MapValue(C, VMap));
- }
- // And named metadata....
- for (Module::const_named_metadata_iterator I = M->named_metadata_begin(),
- E = M->named_metadata_end(); I != E; ++I) {
- const NamedMDNode &NMD = *I;
- NamedMDNode *NewNMD = New->getOrInsertNamedMetadata(NMD.getName());
- for (unsigned i = 0, e = NMD.getNumOperands(); i != e; ++i)
- NewNMD->addOperand(MapValue(NMD.getOperand(i), VMap));
- }
- return New;
- }