#include "llvm/Transforms/Utils/ValueMapper.h"
#include "llvm/IR/CallSite.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/InlineAsm.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/Metadata.h"
#include "llvm/IR/Operator.h"
using namespace llvm;
void ValueMapTypeRemapper::anchor() {}
void ValueMaterializer::anchor() {}
Value *llvm::MapValue(const Value *V, ValueToValueMapTy &VM, RemapFlags Flags,
ValueMapTypeRemapper *TypeMapper,
ValueMaterializer *Materializer) {
ValueToValueMapTy::iterator I = VM.find(V);
if (I != VM.end() && I->second) return I->second;
if (Materializer) {
if (Value *NewV = Materializer->materializeValueFor(const_cast<Value*>(V)))
return VM[V] = NewV;
}
if (isa<GlobalValue>(V))
return VM[V] = const_cast<Value*>(V);
if (const InlineAsm *IA = dyn_cast<InlineAsm>(V)) {
FunctionType *NewTy = IA->getFunctionType();
if (TypeMapper) {
NewTy = cast<FunctionType>(TypeMapper->remapType(NewTy));
if (NewTy != IA->getFunctionType())
V = InlineAsm::get(NewTy, IA->getAsmString(), IA->getConstraintString(),
IA->hasSideEffects(), IA->isAlignStack());
}
return VM[V] = const_cast<Value*>(V);
}
if (const auto *MDV = dyn_cast<MetadataAsValue>(V)) {
const Metadata *MD = MDV->getMetadata();
if (!isa<LocalAsMetadata>(MD) && (Flags & RF_NoModuleLevelChanges))
return VM[V] = const_cast<Value *>(V);
auto *MappedMD = MapMetadata(MD, VM, Flags, TypeMapper, Materializer);
if (MD == MappedMD || (!MappedMD && (Flags & RF_IgnoreMissingEntries)))
return VM[V] = const_cast<Value *>(V);
return VM[V] = MetadataAsValue::get(V->getContext(), MappedMD);
}
Constant *C = const_cast<Constant*>(dyn_cast<Constant>(V));
if (!C)
return nullptr;
if (BlockAddress *BA = dyn_cast<BlockAddress>(C)) {
Function *F =
cast<Function>(MapValue(BA->getFunction(), VM, Flags, TypeMapper, Materializer));
BasicBlock *BB = cast_or_null<BasicBlock>(MapValue(BA->getBasicBlock(), VM,
Flags, TypeMapper, Materializer));
return VM[V] = BlockAddress::get(F, BB ? BB : BA->getBasicBlock());
}
unsigned OpNo = 0, NumOperands = C->getNumOperands();
Value *Mapped = nullptr;
for (; OpNo != NumOperands; ++OpNo) {
Value *Op = C->getOperand(OpNo);
Mapped = MapValue(Op, VM, Flags, TypeMapper, Materializer);
if (Mapped != C) break;
}
Type *NewTy = C->getType();
if (TypeMapper)
NewTy = TypeMapper->remapType(NewTy);
if (OpNo == NumOperands && NewTy == C->getType())
return VM[V] = C;
SmallVector<Constant*, 8> Ops;
Ops.reserve(NumOperands);
for (unsigned j = 0; j != OpNo; ++j)
Ops.push_back(cast<Constant>(C->getOperand(j)));
if (OpNo != NumOperands) {
Ops.push_back(cast<Constant>(Mapped));
for (++OpNo; OpNo != NumOperands; ++OpNo)
Ops.push_back(MapValue(cast<Constant>(C->getOperand(OpNo)), VM,
Flags, TypeMapper, Materializer));
}
Type *NewSrcTy = nullptr;
if (TypeMapper)
if (auto *GEPO = dyn_cast<GEPOperator>(C))
NewSrcTy = TypeMapper->remapType(GEPO->getSourceElementType());
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C))
return VM[V] = CE->getWithOperands(Ops, NewTy, false, NewSrcTy);
if (isa<ConstantArray>(C))
return VM[V] = ConstantArray::get(cast<ArrayType>(NewTy), Ops);
if (isa<ConstantStruct>(C))
return VM[V] = ConstantStruct::get(cast<StructType>(NewTy), Ops);
if (isa<ConstantVector>(C))
return VM[V] = ConstantVector::get(Ops);
if (isa<UndefValue>(C))
return VM[V] = UndefValue::get(NewTy);
if (isa<ConstantAggregateZero>(C))
return VM[V] = ConstantAggregateZero::get(NewTy);
assert(isa<ConstantPointerNull>(C));
return VM[V] = ConstantPointerNull::get(cast<PointerType>(NewTy));
}
static Metadata *mapToMetadata(ValueToValueMapTy &VM, const Metadata *Key,
Metadata *Val) {
VM.MD()[Key].reset(Val);
return Val;
}
static Metadata *mapToSelf(ValueToValueMapTy &VM, const Metadata *MD) {
return mapToMetadata(VM, MD, const_cast<Metadata *>(MD));
}
static Metadata *MapMetadataImpl(const Metadata *MD,
SmallVectorImpl<MDNode *> &DistinctWorklist,
ValueToValueMapTy &VM, RemapFlags Flags,
ValueMapTypeRemapper *TypeMapper,
ValueMaterializer *Materializer);
static Metadata *mapMetadataOp(Metadata *Op,
SmallVectorImpl<MDNode *> &DistinctWorklist,
ValueToValueMapTy &VM, RemapFlags Flags,
ValueMapTypeRemapper *TypeMapper,
ValueMaterializer *Materializer) {
if (!Op)
return nullptr;
if (Metadata *MappedOp = MapMetadataImpl(Op, DistinctWorklist, VM, Flags,
TypeMapper, Materializer))
return MappedOp;
if (Flags & RF_IgnoreMissingEntries)
return Op;
return nullptr;
}
static void resolveCycles(Metadata *MD) {
if (auto *N = dyn_cast_or_null<MDNode>(MD))
if (!N->isResolved())
N->resolveCycles();
}
static bool remapOperands(MDNode &Node,
SmallVectorImpl<MDNode *> &DistinctWorklist,
ValueToValueMapTy &VM, RemapFlags Flags,
ValueMapTypeRemapper *TypeMapper,
ValueMaterializer *Materializer) {
assert(!Node.isUniqued() && "Expected temporary or distinct node");
const bool IsDistinct = Node.isDistinct();
bool AnyChanged = false;
for (unsigned I = 0, E = Node.getNumOperands(); I != E; ++I) {
Metadata *Old = Node.getOperand(I);
Metadata *New = mapMetadataOp(Old, DistinctWorklist, VM, Flags, TypeMapper,
Materializer);
if (Old != New) {
AnyChanged = true;
Node.replaceOperandWith(I, New);
if (IsDistinct)
resolveCycles(New);
}
}
return AnyChanged;
}
static Metadata *mapDistinctNode(const MDNode *Node,
SmallVectorImpl<MDNode *> &DistinctWorklist,
ValueToValueMapTy &VM, RemapFlags Flags,
ValueMapTypeRemapper *TypeMapper,
ValueMaterializer *Materializer) {
assert(Node->isDistinct() && "Expected distinct node");
MDNode *NewMD;
if (Flags & RF_MoveDistinctMDs)
NewMD = const_cast<MDNode *>(Node);
else
NewMD = MDNode::replaceWithDistinct(Node->clone());
DistinctWorklist.push_back(NewMD);
return mapToMetadata(VM, Node, NewMD);
}
static Metadata *mapUniquedNode(const MDNode *Node,
SmallVectorImpl<MDNode *> &DistinctWorklist,
ValueToValueMapTy &VM, RemapFlags Flags,
ValueMapTypeRemapper *TypeMapper,
ValueMaterializer *Materializer) {
assert(Node->isUniqued() && "Expected uniqued node");
auto ClonedMD = Node->clone();
mapToMetadata(VM, Node, ClonedMD.get());
if (!remapOperands(*ClonedMD, DistinctWorklist, VM, Flags, TypeMapper,
Materializer)) {
ClonedMD->replaceAllUsesWith(const_cast<MDNode *>(Node));
return const_cast<MDNode *>(Node);
}
return MDNode::replaceWithUniqued(std::move(ClonedMD));
}
static Metadata *MapMetadataImpl(const Metadata *MD,
SmallVectorImpl<MDNode *> &DistinctWorklist,
ValueToValueMapTy &VM, RemapFlags Flags,
ValueMapTypeRemapper *TypeMapper,
ValueMaterializer *Materializer) {
if (Metadata *NewMD = VM.MD().lookup(MD).get())
return NewMD;
if (isa<MDString>(MD))
return mapToSelf(VM, MD);
if (isa<ConstantAsMetadata>(MD))
if ((Flags & RF_NoModuleLevelChanges))
return mapToSelf(VM, MD);
if (const auto *VMD = dyn_cast<ValueAsMetadata>(MD)) {
Value *MappedV =
MapValue(VMD->getValue(), VM, Flags, TypeMapper, Materializer);
if (VMD->getValue() == MappedV ||
(!MappedV && (Flags & RF_IgnoreMissingEntries)))
return mapToSelf(VM, MD);
if (MappedV)
return mapToMetadata(VM, MD, ValueAsMetadata::get(MappedV));
return nullptr;
}
const MDNode *Node = cast<MDNode>(MD);
if (Flags & RF_NoModuleLevelChanges)
return mapToSelf(VM, MD);
assert(Node->isResolved() && "Unexpected unresolved node");
if (Node->isDistinct())
return mapDistinctNode(Node, DistinctWorklist, VM, Flags, TypeMapper,
Materializer);
return mapUniquedNode(Node, DistinctWorklist, VM, Flags, TypeMapper,
Materializer);
}
Metadata *llvm::MapMetadata(const Metadata *MD, ValueToValueMapTy &VM,
RemapFlags Flags, ValueMapTypeRemapper *TypeMapper,
ValueMaterializer *Materializer) {
SmallVector<MDNode *, 8> DistinctWorklist;
Metadata *NewMD = MapMetadataImpl(MD, DistinctWorklist, VM, Flags, TypeMapper,
Materializer);
if (Flags & RF_NoModuleLevelChanges)
return NewMD;
resolveCycles(NewMD);
while (!DistinctWorklist.empty())
remapOperands(*DistinctWorklist.pop_back_val(), DistinctWorklist, VM, Flags,
TypeMapper, Materializer);
return NewMD;
}
MDNode *llvm::MapMetadata(const MDNode *MD, ValueToValueMapTy &VM,
RemapFlags Flags, ValueMapTypeRemapper *TypeMapper,
ValueMaterializer *Materializer) {
return cast<MDNode>(MapMetadata(static_cast<const Metadata *>(MD), VM, Flags,
TypeMapper, Materializer));
}
void llvm::RemapInstruction(Instruction *I, ValueToValueMapTy &VMap,
RemapFlags Flags, ValueMapTypeRemapper *TypeMapper,
ValueMaterializer *Materializer){
for (User::op_iterator op = I->op_begin(), E = I->op_end(); op != E; ++op) {
Value *V = MapValue(*op, VMap, Flags, TypeMapper, Materializer);
if (V)
*op = V;
else
assert((Flags & RF_IgnoreMissingEntries) &&
"Referenced value not in value map!");
}
if (PHINode *PN = dyn_cast<PHINode>(I)) {
for (unsigned i = 0, e = PN->getNumIncomingValues(); i != e; ++i) {
Value *V = MapValue(PN->getIncomingBlock(i), VMap, Flags);
if (V)
PN->setIncomingBlock(i, cast<BasicBlock>(V));
else
assert((Flags & RF_IgnoreMissingEntries) &&
"Referenced block not in value map!");
}
}
SmallVector<std::pair<unsigned, MDNode *>, 4> MDs;
I->getAllMetadata(MDs);
for (const auto &MI : MDs) {
MDNode *Old = MI.second;
MDNode *New = MapMetadata(Old, VMap, Flags, TypeMapper, Materializer);
if (New != Old)
I->setMetadata(MI.first, New);
}
if (!TypeMapper)
return;
if (auto CS = CallSite(I)) {
SmallVector<Type *, 3> Tys;
FunctionType *FTy = CS.getFunctionType();
Tys.reserve(FTy->getNumParams());
for (Type *Ty : FTy->params())
Tys.push_back(TypeMapper->remapType(Ty));
CS.mutateFunctionType(FunctionType::get(
TypeMapper->remapType(I->getType()), Tys, FTy->isVarArg()));
return;
}
if (auto *AI = dyn_cast<AllocaInst>(I))
AI->setAllocatedType(TypeMapper->remapType(AI->getAllocatedType()));
if (auto *GEP = dyn_cast<GetElementPtrInst>(I)) {
GEP->setSourceElementType(
TypeMapper->remapType(GEP->getSourceElementType()));
GEP->setResultElementType(
TypeMapper->remapType(GEP->getResultElementType()));
}
I->mutateType(TypeMapper->remapType(I->getType()));
}