//===----------------------------------------------------------------------===//
#include "llvm/Transforms/Utils/Cloning.h"
-#include "llvm/Module.h"
-#include "llvm/DerivedTypes.h"
-#include "llvm/TypeSymbolTable.h"
-#include "llvm/Constant.h"
-#include "ValueMapper.h"
+#include "llvm/IR/Constant.h"
+#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
return CloneModule(M, VMap);
}
-Module *llvm::CloneModule(const Module *M,
- ValueToValueMapTy &VMap) {
- // First off, we need to create the new module...
+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());
New->setTargetTriple(M->getTargetTriple());
New->setModuleInlineAsm(M->getModuleInlineAsm());
-
- // Copy all of the type symbol table entries over.
- const TypeSymbolTable &TST = M->getTypeSymbolTable();
- for (TypeSymbolTable::const_iterator TI = TST.begin(), TE = TST.end();
- TI != TE; ++TI)
- New->addTypeName(TI->first, TI->second);
-
- // Copy all of the dependent libraries over.
- for (Module::lib_iterator I = M->lib_begin(), E = M->lib_end(); I != E; ++I)
- New->addLibrary(*I);
-
+
// 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.
I != E; ++I) {
GlobalVariable *GV = new GlobalVariable(*New,
I->getType()->getElementType(),
- false,
- GlobalValue::ExternalLinkage, 0,
- I->getName());
- GV->setAlignment(I->getAlignment());
- VMap[I] = GV;
+ I->isConstant(), I->getLinkage(),
+ (Constant*) nullptr, I->getName(),
+ (GlobalVariable*) nullptr,
+ 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()),
- GlobalValue::ExternalLinkage, I->getName(), New);
- NF->copyAttributesFrom(I);
- VMap[I] = NF;
+ 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)
- VMap[I] = new GlobalAlias(I->getType(), GlobalAlias::ExternalLinkage,
- I->getName(), NULL, New);
+ I != E; ++I) {
+ 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
// have been created, loop through and copy the global variable referrers
//
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(cast<Constant>(MapValue(I->getInitializer(),
- VMap)));
- GV->setLinkage(I->getLinkage());
- GV->setThreadLocal(I->isThreadLocal());
- GV->setConstant(I->isConstant());
+ 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, Returns);
+ CloneFunctionInto(F, &*I, VMap, /*ModuleLevelChanges=*/true, Returns);
}
- F->setLinkage(I->getLinkage());
+ 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]);
- GA->setLinkage(I->getLinkage());
- if (const Constant* C = I->getAliasee())
- GA->setAliasee(cast<Constant>(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....
for (Module::const_named_metadata_iterator I = M->named_metadata_begin(),
E = M->named_metadata_end(); I != E; ++I) {
const NamedMDNode &NMD = *I;
- SmallVector<MDNode*, 4> MDs;
+ NamedMDNode *NewNMD = New->getOrInsertNamedMetadata(NMD.getName());
for (unsigned i = 0, e = NMD.getNumOperands(); i != e; ++i)
- MDs.push_back(cast<MDNode>(MapValue(NMD.getOperand(i), VMap)));
- NamedMDNode::Create(New->getContext(), NMD.getName(),
- MDs.data(), MDs.size(), New);
+ NewNMD->addOperand(MapMetadata(NMD.getOperand(i), VMap));
}
- // Update metadata attach with instructions.
- for (Module::iterator MI = New->begin(), ME = New->end(); MI != ME; ++MI)
- for (Function::iterator FI = MI->begin(), FE = MI->end();
- FI != FE; ++FI)
- for (BasicBlock::iterator BI = FI->begin(), BE = FI->end();
- BI != BE; ++BI) {
- SmallVector<std::pair<unsigned, MDNode *>, 4 > MDs;
- BI->getAllMetadata(MDs);
- for (SmallVector<std::pair<unsigned, MDNode *>, 4>::iterator
- MDI = MDs.begin(), MDE = MDs.end(); MDI != MDE; ++MDI) {
- Value *MappedValue = MapValue(MDI->second, VMap);
- if (MDI->second != MappedValue && MappedValue)
- BI->setMetadata(MDI->first, cast<MDNode>(MappedValue));
- }
- }
return New;
}
+
+extern "C" {
+
+LLVMModuleRef LLVMCloneModule(LLVMModuleRef M) {
+ return wrap(CloneModule(unwrap(M)));
+}
+
+}
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