#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Module.h"
#include "llvm/Transforms/Utils/ValueMapper.h"
+#include "llvm-c/Core.h"
using namespace llvm;
/// CloneModule - Return an exact copy of the specified module. This is not as
}
Module *llvm::CloneModule(const Module *M, ValueToValueMapTy &VMap) {
+ return CloneModule(M, VMap, [](const GlobalValue *GV) { return true; });
+}
+
+Module *llvm::CloneModule(
+ const Module *M, ValueToValueMapTy &VMap,
+ std::function<bool(const GlobalValue *)> ShouldCloneDefinition) {
// First off, we need to create the new module.
Module *New = new Module(M->getModuleIdentifier(), M->getContext());
New->setDataLayout(M->getDataLayout());
(GlobalVariable*) nullptr,
I->getThreadLocalMode(),
I->getType()->getAddressSpace());
- GV->copyAttributesFrom(I);
- VMap[I] = GV;
+ GV->copyAttributesFrom(&*I);
+ VMap[&*I] = GV;
}
// Loop over the functions in the module, making external functions as before
Function *NF =
Function::Create(cast<FunctionType>(I->getType()->getElementType()),
I->getLinkage(), I->getName(), New);
- NF->copyAttributesFrom(I);
- VMap[I] = NF;
+ 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) {
- auto *PTy = cast<PointerType>(I->getType());
- auto *GA =
- new GlobalAlias(PTy->getElementType(), I->getLinkage(), I->getName(),
- nullptr, New, PTy->getAddressSpace());
- GA->copyAttributesFrom(I);
- VMap[I] = GA;
+ if (!ShouldCloneDefinition(&*I)) {
+ // An alias cannot act as an external reference, so we need to create
+ // either a function or a global variable depending on the value type.
+ // FIXME: Once pointee types are gone we can probably pick one or the
+ // other.
+ GlobalValue *GV;
+ if (I->getValueType()->isFunctionTy())
+ GV = Function::Create(cast<FunctionType>(I->getValueType()),
+ GlobalValue::ExternalLinkage, I->getName(), New);
+ else
+ GV = new GlobalVariable(
+ *New, I->getValueType(), false, GlobalValue::ExternalLinkage,
+ (Constant *)nullptr, I->getName(), (GlobalVariable *)nullptr,
+ I->getThreadLocalMode(), I->getType()->getAddressSpace());
+ VMap[&*I] = GV;
+ // We do not copy attributes (mainly because copying between different
+ // kinds of globals is forbidden), but this is generally not required for
+ // correctness.
+ continue;
+ }
+ auto *GA = GlobalAlias::create(I->getValueType(),
+ I->getType()->getPointerAddressSpace(),
+ I->getLinkage(), I->getName(), New);
+ GA->copyAttributesFrom(&*I);
+ VMap[&*I] = GA;
}
// Now that all of the things that global variable initializer can refer to
//
for (Module::const_global_iterator I = M->global_begin(), E = M->global_end();
I != E; ++I) {
- GlobalVariable *GV = cast<GlobalVariable>(VMap[I]);
+ GlobalVariable *GV = cast<GlobalVariable>(VMap[&*I]);
+ if (!ShouldCloneDefinition(&*I)) {
+ // Skip after setting the correct linkage for an external reference.
+ GV->setLinkage(GlobalValue::ExternalLinkage);
+ continue;
+ }
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]);
+ Function *F = cast<Function>(VMap[&*I]);
+ if (!ShouldCloneDefinition(&*I)) {
+ // Skip after setting the correct linkage for an external reference.
+ F->setLinkage(GlobalValue::ExternalLinkage);
+ continue;
+ }
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++;
+ VMap[&*J] = &*DestI++;
}
SmallVector<ReturnInst*, 8> Returns; // Ignore returns cloned.
- CloneFunctionInto(F, I, VMap, /*ModuleLevelChanges=*/true, Returns);
+ CloneFunctionInto(F, &*I, VMap, /*ModuleLevelChanges=*/true, Returns);
}
+
+ if (I->hasPersonalityFn())
+ F->setPersonalityFn(MapValue(I->getPersonalityFn(), VMap));
}
// 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 GlobalObject *C = I->getAliasee())
- GA->setAliasee(cast<GlobalObject>(MapValue(C, VMap)));
+ // We already dealt with undefined aliases above.
+ if (!ShouldCloneDefinition(&*I))
+ continue;
+ GlobalAlias *GA = cast<GlobalAlias>(VMap[&*I]);
+ if (const Constant *C = I->getAliasee())
+ GA->setAliasee(MapValue(C, VMap));
}
// And named metadata....
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));
+ NewNMD->addOperand(MapMetadata(NMD.getOperand(i), VMap));
}
return New;
}
+
+extern "C" {
+
+LLVMModuleRef LLVMCloneModule(LLVMModuleRef M) {
+ return wrap(CloneModule(unwrap(M)));
+}
+
+}