forked from OSchip/llvm-project
74 lines
2.8 KiB
C++
74 lines
2.8 KiB
C++
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//===- CloneModule.cpp - Clone an entire module ---------------------------===//
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//
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// This file implements the CloneModule interface which makes a copy of an
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// entire module.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Transforms/Utils/Cloning.h"
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#include "llvm/Module.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Constant.h"
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#include "ValueMapper.h"
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/// CloneModule - Return an exact copy of the specified module. This is not as
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/// easy as it might seem because we have to worry about making copies of global
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/// variables and functions, and making their (intializers and references,
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/// respectively) refer to the right globals.
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///
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Module *CloneModule(const Module *M) {
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// First off, we need to create the new module...
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Module *New = new Module();
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// Create the value map that maps things from the old module over to the new
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// module.
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std::map<const Value*, Value*> ValueMap;
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// Loop over all of the global variables, making corresponding globals in the
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// new module. Here we add them to the ValueMap and to the new Module. We
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// don't worry about attributes or initializers, they will come later.
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//
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for (Module::const_giterator I = M->gbegin(), E = M->gend(); I != E; ++I)
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ValueMap[I] = new GlobalVariable(I->getType()->getElementType(),
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false, false, 0, I->getName(), New);
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// Loop over the functions in the module, making external functions as before
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for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I)
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ValueMap[I]=new Function(cast<FunctionType>(I->getType()->getElementType()),
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false, I->getName(), New);
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// Now that all of the things that global variable initializer can refer to
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// have been created, loop through and copy the global variable referrers
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// over... We also set the attributes on the global now.
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//
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for (Module::const_giterator I = M->gbegin(), E = M->gend(); I != E; ++I) {
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GlobalVariable *GV = cast<GlobalVariable>(ValueMap[I]);
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if (I->hasInitializer())
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GV->setInitializer(cast<Constant>(MapValue(I->getInitializer(),
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ValueMap)));
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if (I->hasInternalLinkage())
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GV->setInternalLinkage(true);
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}
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// Similarly, copy over function bodies now...
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//
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for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I) {
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Function *F = cast<Function>(ValueMap[I]);
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if (!I->isExternal()) {
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Function::aiterator DestI = F->abegin();
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for (Function::const_aiterator J = I->abegin(); J != I->aend(); ++J) {
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DestI->setName(J->getName());
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ValueMap[J] = DestI++;
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}
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std::vector<ReturnInst*> Returns; // Ignore returns cloned...
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CloneFunctionInto(F, I, ValueMap, Returns);
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}
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if (I->hasInternalLinkage())
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F->setInternalLinkage(true);
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}
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return New;
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}
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