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- //===- CloneModule.cpp - Clone an entire module ---------------------------===//
- //
- // The LLVM Compiler Infrastructure
- //
- // This file was developed by the LLVM research group and 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/Module.h"
- #include "llvm/DerivedTypes.h"
- #include "llvm/SymbolTable.h"
- #include "llvm/Constant.h"
- #include "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) {
- // First off, we need to create the new module...
- Module *New = new Module(M->getModuleIdentifier());
- New->setEndianness(M->getEndianness());
- New->setPointerSize(M->getPointerSize());
- // Copy all of the type symbol table entries over...
- const SymbolTable &SymTab = M->getSymbolTable();
- SymbolTable::type_const_iterator TypeI = SymTab.type_begin();
- SymbolTable::type_const_iterator TypeE = SymTab.type_end();
- for ( ; TypeI != TypeE; ++TypeI ) {
- New->addTypeName(TypeI->first, TypeI->second);
- }
- // Create the value map that maps things from the old module over to the new
- // module.
- std::map<const Value*, Value*> ValueMap;
- // Loop over all of the global variables, making corresponding globals in the
- // new module. Here we add them to the ValueMap 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)
- ValueMap[I] = new GlobalVariable(I->getType()->getElementType(), false,
- GlobalValue::ExternalLinkage, 0,
- I->getName(), New);
- // 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 =
- new Function(cast<FunctionType>(I->getType()->getElementType()),
- GlobalValue::ExternalLinkage, I->getName(), New);
- NF->setCallingConv(I->getCallingConv());
- ValueMap[I]= NF;
- }
- // 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>(ValueMap[I]);
- if (I->hasInitializer())
- GV->setInitializer(cast<Constant>(MapValue(I->getInitializer(),
- ValueMap)));
- GV->setLinkage(I->getLinkage());
- }
- // Similarly, copy over function bodies now...
- //
- for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I) {
- Function *F = cast<Function>(ValueMap[I]);
- if (!I->isExternal()) {
- 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());
- ValueMap[J] = DestI++;
- }
- std::vector<ReturnInst*> Returns; // Ignore returns cloned...
- CloneFunctionInto(F, I, ValueMap, Returns);
- }
- F->setLinkage(I->getLinkage());
- }
- return New;
- }
- // vim: sw=2
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