//===----------------------------------------------------------------------===//
#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"
// Out of line method to get vtable etc for class.
void ValueMapTypeRemapper::anchor() {}
+void ValueMaterializer::anchor() {}
Value *llvm::MapValue(const Value *V, ValueToValueMapTy &VM, RemapFlags Flags,
- ValueMapTypeRemapper *TypeMapper) {
+ ValueMapTypeRemapper *TypeMapper,
+ ValueMaterializer *Materializer) {
ValueToValueMapTy::iterator I = VM.find(V);
// If the value already exists in the map, use it.
if (I != VM.end() && I->second) return I->second;
+ // If we have a materializer and it can materialize a value, use that.
+ if (Materializer) {
+ if (Value *NewV = Materializer->materializeValueFor(const_cast<Value*>(V)))
+ return VM[V] = NewV;
+ }
+
// Global values do not need to be seeded into the VM if they
// are using the identity mapping.
- if (isa<GlobalValue>(V) || isa<MDString>(V))
+ if (isa<GlobalValue>(V))
return VM[V] = const_cast<Value*>(V);
if (const InlineAsm *IA = dyn_cast<InlineAsm>(V)) {
return VM[V] = const_cast<Value*>(V);
}
-
- if (const MDNode *MD = dyn_cast<MDNode>(V)) {
+ if (const auto *MDV = dyn_cast<MetadataAsValue>(V)) {
+ const Metadata *MD = MDV->getMetadata();
// If this is a module-level metadata and we know that nothing at the module
// level is changing, then use an identity mapping.
- if (!MD->isFunctionLocal() && (Flags & RF_NoModuleLevelChanges))
- return VM[V] = const_cast<Value*>(V);
-
- // Create a dummy node in case we have a metadata cycle.
- MDNode *Dummy = MDNode::getTemporary(V->getContext(), ArrayRef<Value*>());
- VM[V] = Dummy;
-
- // Check all operands to see if any need to be remapped.
- for (unsigned i = 0, e = MD->getNumOperands(); i != e; ++i) {
- Value *OP = MD->getOperand(i);
- if (OP == 0 || MapValue(OP, VM, Flags, TypeMapper) == OP) continue;
-
- // Ok, at least one operand needs remapping.
- SmallVector<Value*, 4> Elts;
- Elts.reserve(MD->getNumOperands());
- for (i = 0; i != e; ++i) {
- Value *Op = MD->getOperand(i);
- Elts.push_back(Op ? MapValue(Op, VM, Flags, TypeMapper) : 0);
- }
- MDNode *NewMD = MDNode::get(V->getContext(), Elts);
- Dummy->replaceAllUsesWith(NewMD);
- VM[V] = NewMD;
- MDNode::deleteTemporary(Dummy);
- return NewMD;
- }
+ if (!isa<LocalAsMetadata>(MD) && (Flags & RF_NoModuleLevelChanges))
+ return VM[V] = const_cast<Value *>(V);
- VM[V] = const_cast<Value*>(V);
- MDNode::deleteTemporary(Dummy);
+ auto *MappedMD = MapMetadata(MD, VM, Flags, TypeMapper, Materializer);
+ if (MD == MappedMD || (!MappedMD && (Flags & RF_IgnoreMissingEntries)))
+ return VM[V] = const_cast<Value *>(V);
- // No operands needed remapping. Use an identity mapping.
- return const_cast<Value*>(V);
+ // FIXME: This assert crashes during bootstrap, but I think it should be
+ // correct. For now, just match behaviour from before the metadata/value
+ // split.
+ //
+ // assert(MappedMD && "Referenced metadata value not in value map");
+ return VM[V] = MetadataAsValue::get(V->getContext(), MappedMD);
}
// Okay, this either must be a constant (which may or may not be mappable) or
// is something that is not in the mapping table.
Constant *C = const_cast<Constant*>(dyn_cast<Constant>(V));
- if (C == 0)
- return 0;
+ if (!C)
+ return nullptr;
if (BlockAddress *BA = dyn_cast<BlockAddress>(C)) {
Function *F =
- cast<Function>(MapValue(BA->getFunction(), VM, Flags, TypeMapper));
+ cast<Function>(MapValue(BA->getFunction(), VM, Flags, TypeMapper, Materializer));
BasicBlock *BB = cast_or_null<BasicBlock>(MapValue(BA->getBasicBlock(), VM,
- Flags, TypeMapper));
+ Flags, TypeMapper, Materializer));
return VM[V] = BlockAddress::get(F, BB ? BB : BA->getBasicBlock());
}
// Otherwise, we have some other constant to remap. Start by checking to see
// if all operands have an identity remapping.
unsigned OpNo = 0, NumOperands = C->getNumOperands();
- Value *Mapped = 0;
+ Value *Mapped = nullptr;
for (; OpNo != NumOperands; ++OpNo) {
Value *Op = C->getOperand(OpNo);
- Mapped = MapValue(Op, VM, Flags, TypeMapper);
+ Mapped = MapValue(Op, VM, Flags, TypeMapper, Materializer);
if (Mapped != C) break;
}
// Map the rest of the operands that aren't processed yet.
for (++OpNo; OpNo != NumOperands; ++OpNo)
Ops.push_back(MapValue(cast<Constant>(C->getOperand(OpNo)), VM,
- Flags, TypeMapper));
+ Flags, TypeMapper, Materializer));
}
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(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 *> &Cycles,
+ ValueToValueMapTy &VM, RemapFlags Flags,
+ ValueMapTypeRemapper *TypeMapper,
+ ValueMaterializer *Materializer);
+
+static Metadata *mapMetadataOp(Metadata *Op, SmallVectorImpl<MDNode *> &Cycles,
+ ValueToValueMapTy &VM, RemapFlags Flags,
+ ValueMapTypeRemapper *TypeMapper,
+ ValueMaterializer *Materializer) {
+ if (!Op)
+ return nullptr;
+ if (Metadata *MappedOp =
+ MapMetadataImpl(Op, Cycles, VM, Flags, TypeMapper, Materializer))
+ return MappedOp;
+ // Use identity map if MappedOp is null and we can ignore missing entries.
+ if (Flags & RF_IgnoreMissingEntries)
+ return Op;
+
+ // FIXME: This assert crashes during bootstrap, but I think it should be
+ // correct. For now, just match behaviour from before the metadata/value
+ // split.
+ //
+ // llvm_unreachable("Referenced metadata not in value map!");
+ return nullptr;
+}
+
+/// \brief Remap nodes.
+///
+/// Insert \c NewNode in the value map, and then remap \c OldNode's operands.
+/// Assumes that \c NewNode is already a clone of \c OldNode.
+///
+/// \pre \c NewNode is a clone of \c OldNode.
+static bool remap(const MDNode *OldNode, MDNode *NewNode,
+ SmallVectorImpl<MDNode *> &Cycles, ValueToValueMapTy &VM,
+ RemapFlags Flags, ValueMapTypeRemapper *TypeMapper,
+ ValueMaterializer *Materializer) {
+ assert(OldNode->getNumOperands() == NewNode->getNumOperands() &&
+ "Expected nodes to match");
+ assert(OldNode->isResolved() && "Expected resolved node");
+ assert(!NewNode->isUniqued() && "Expected non-uniqued node");
+
+ // Map the node upfront so it's available for cyclic references.
+ mapToMetadata(VM, OldNode, NewNode);
+ bool AnyChanged = false;
+ for (unsigned I = 0, E = OldNode->getNumOperands(); I != E; ++I) {
+ Metadata *Old = OldNode->getOperand(I);
+ assert(NewNode->getOperand(I) == Old &&
+ "Expected old operands to already be in place");
+
+ Metadata *New = mapMetadataOp(OldNode->getOperand(I), Cycles, VM, Flags,
+ TypeMapper, Materializer);
+ if (Old != New) {
+ AnyChanged = true;
+ NewNode->replaceOperandWith(I, New);
+ }
+ }
+
+ return AnyChanged;
+}
+
+/// \brief Map a distinct MDNode.
+///
+/// Distinct nodes are not uniqued, so they must always recreated.
+static Metadata *mapDistinctNode(const MDNode *Node,
+ SmallVectorImpl<MDNode *> &Cycles,
+ ValueToValueMapTy &VM, RemapFlags Flags,
+ ValueMapTypeRemapper *TypeMapper,
+ ValueMaterializer *Materializer) {
+ assert(Node->isDistinct() && "Expected distinct node");
+
+ MDNode *NewMD = MDNode::replaceWithDistinct(Node->clone());
+ remap(Node, NewMD, Cycles, VM, Flags, TypeMapper, Materializer);
+
+ // Track any cycles beneath this node.
+ for (Metadata *Op : NewMD->operands())
+ if (auto *Node = dyn_cast_or_null<MDNode>(Op))
+ if (!Node->isResolved())
+ Cycles.push_back(Node);
+
+ return NewMD;
+}
+
+/// \brief Map a uniqued MDNode.
+///
+/// Uniqued nodes may not need to be recreated (they may map to themselves).
+static Metadata *mapUniquedNode(const MDNode *Node,
+ SmallVectorImpl<MDNode *> &Cycles,
+ ValueToValueMapTy &VM, RemapFlags Flags,
+ ValueMapTypeRemapper *TypeMapper,
+ ValueMaterializer *Materializer) {
+ assert(Node->isUniqued() && "Expected uniqued node");
+
+ // Create a temporary node upfront in case we have a metadata cycle.
+ auto ClonedMD = Node->clone();
+ if (!remap(Node, ClonedMD.get(), Cycles, VM, Flags, TypeMapper, Materializer))
+ // No operands changed, so use the identity mapping.
+ return mapToSelf(VM, Node);
+
+ // At least one operand has changed, so uniquify the cloned node.
+ return mapToMetadata(VM, Node,
+ MDNode::replaceWithUniqued(std::move(ClonedMD)));
+}
+
+static Metadata *MapMetadataImpl(const Metadata *MD,
+ SmallVectorImpl<MDNode *> &Cycles,
+ ValueToValueMapTy &VM, RemapFlags Flags,
+ ValueMapTypeRemapper *TypeMapper,
+ ValueMaterializer *Materializer) {
+ // If the value already exists in the map, use it.
+ 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);
+
+ // FIXME: This assert crashes during bootstrap, but I think it should be
+ // correct. For now, just match behaviour from before the metadata/value
+ // split.
+ //
+ // assert(MappedV && "Referenced metadata not in value map!");
+ if (MappedV)
+ return mapToMetadata(VM, MD, ValueAsMetadata::get(MappedV));
+ return nullptr;
+ }
+
+ // Note: this cast precedes the Flags check so we always get its associated
+ // assertion.
+ const MDNode *Node = cast<MDNode>(MD);
+
+ // If this is a module-level metadata and we know that nothing at the
+ // module level is changing, then use an identity mapping.
+ if (Flags & RF_NoModuleLevelChanges)
+ return mapToSelf(VM, MD);
+
+ // Require resolved nodes whenever metadata might be remapped.
+ assert(Node->isResolved() && "Unexpected unresolved node");
+
+ if (Node->isDistinct())
+ return mapDistinctNode(Node, Cycles, VM, Flags, TypeMapper, Materializer);
+
+ return mapUniquedNode(Node, Cycles, VM, Flags, TypeMapper, Materializer);
+}
+
+Metadata *llvm::MapMetadata(const Metadata *MD, ValueToValueMapTy &VM,
+ RemapFlags Flags, ValueMapTypeRemapper *TypeMapper,
+ ValueMaterializer *Materializer) {
+ SmallVector<MDNode *, 8> Cycles;
+ Metadata *NewMD =
+ MapMetadataImpl(MD, Cycles, VM, Flags, TypeMapper, Materializer);
+
+ // Resolve cycles underneath MD.
+ if (NewMD && NewMD != MD) {
+ if (auto *N = dyn_cast<MDNode>(NewMD))
+ if (!N->isResolved())
+ N->resolveCycles();
+
+ for (MDNode *N : Cycles)
+ if (!N->isResolved())
+ N->resolveCycles();
+ } else {
+ // Shouldn't get unresolved cycles if nothing was remapped.
+ assert(Cycles.empty() && "Expected no unresolved cycles");
+ }
+
+ 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));
+}
+
/// RemapInstruction - Convert the instruction operands from referencing the
/// current values into those specified by VMap.
///
void llvm::RemapInstruction(Instruction *I, ValueToValueMapTy &VMap,
- RemapFlags Flags, ValueMapTypeRemapper *TypeMapper){
+ RemapFlags Flags, ValueMapTypeRemapper *TypeMapper,
+ ValueMaterializer *Materializer){
// Remap operands.
for (User::op_iterator op = I->op_begin(), E = I->op_end(); op != E; ++op) {
- Value *V = MapValue(*op, VMap, Flags, TypeMapper);
+ Value *V = MapValue(*op, VMap, Flags, TypeMapper, Materializer);
// If we aren't ignoring missing entries, assert that something happened.
- if (V != 0)
+ if (V)
*op = V;
else
assert((Flags & RF_IgnoreMissingEntries) &&
for (unsigned i = 0, e = PN->getNumIncomingValues(); i != e; ++i) {
Value *V = MapValue(PN->getIncomingBlock(i), VMap, Flags);
// If we aren't ignoring missing entries, assert that something happened.
- if (V != 0)
+ if (V)
PN->setIncomingBlock(i, cast<BasicBlock>(V));
else
assert((Flags & RF_IgnoreMissingEntries) &&
// Remap attached metadata.
SmallVector<std::pair<unsigned, MDNode *>, 4> MDs;
I->getAllMetadata(MDs);
- for (SmallVectorImpl<std::pair<unsigned, MDNode *> >::iterator
- MI = MDs.begin(), ME = MDs.end(); MI != ME; ++MI) {
+ for (SmallVectorImpl<std::pair<unsigned, MDNode *>>::iterator
+ MI = MDs.begin(),
+ ME = MDs.end();
+ MI != ME; ++MI) {
MDNode *Old = MI->second;
- MDNode *New = MapValue(Old, VMap, Flags, TypeMapper);
+ MDNode *New = MapMetadata(Old, VMap, Flags, TypeMapper, Materializer);
if (New != Old)
I->setMetadata(MI->first, New);
}
+ if (!TypeMapper)
+ return;
+
// If the instruction's type is being remapped, do so now.
- if (TypeMapper)
- I->mutateType(TypeMapper->remapType(I->getType()));
+ 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()));
+ I->mutateType(TypeMapper->remapType(I->getType()));
}
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