#include "llvm/IR/InlineAsm.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/Metadata.h"
+#include "llvm/IR/Operator.h"
using namespace llvm;
// Out of line method to get vtable etc for class.
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);
+ 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))
}
static Metadata *MapMetadataImpl(const Metadata *MD,
- SmallVectorImpl<MDNode *> &Cycles,
+ SmallVectorImpl<MDNode *> &DistinctWorklist,
ValueToValueMapTy &VM, RemapFlags Flags,
ValueMapTypeRemapper *TypeMapper,
ValueMaterializer *Materializer);
-static Metadata *mapMetadataOp(Metadata *Op, SmallVectorImpl<MDNode *> &Cycles,
+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, Cycles, VM, Flags, TypeMapper, Materializer))
+ if (Metadata *MappedOp = MapMetadataImpl(Op, DistinctWorklist, VM, Flags,
+ TypeMapper, Materializer))
return MappedOp;
// Use identity map if MappedOp is null and we can ignore missing entries.
if (Flags & RF_IgnoreMissingEntries)
return nullptr;
}
-/// \brief Remap nodes.
+/// Resolve uniquing cycles involving the given metadata.
+static void resolveCycles(Metadata *MD) {
+ if (auto *N = dyn_cast_or_null<MDNode>(MD))
+ if (!N->isResolved())
+ N->resolveCycles();
+}
+
+/// Remap the operands of an MDNode.
///
-/// 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.
+/// If \c Node is temporary, uniquing cycles are ignored. If \c Node is
+/// distinct, uniquing cycles are resolved as they're found.
///
-/// \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");
+/// \pre \c Node.isDistinct() or \c Node.isTemporary().
+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();
- Metadata *New = mapMetadataOp(OldNode->getOperand(I), Cycles, VM, Flags,
- TypeMapper, Materializer);
+ 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;
- NewNode->replaceOperandWith(I, New);
+ Node.replaceOperandWith(I, New);
+
+ // Resolve uniquing cycles underneath distinct nodes on the fly so they
+ // don't infect later operands.
+ if (IsDistinct)
+ resolveCycles(New);
}
}
return AnyChanged;
}
-/// \brief Map a distinct MDNode.
+/// Map a distinct MDNode.
///
-/// Distinct nodes are not uniqued, so they must always recreated.
+/// Whether distinct nodes change is independent of their operands. If \a
+/// RF_MoveDistinctMDs, then they are reused, and their operands remapped in
+/// place; effectively, they're moved from one graph to another. Otherwise,
+/// they're cloned/duplicated, and the new copy's operands are remapped.
static Metadata *mapDistinctNode(const MDNode *Node,
- SmallVectorImpl<MDNode *> &Cycles,
+ SmallVectorImpl<MDNode *> &DistinctWorklist,
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);
+ MDNode *NewMD;
+ if (Flags & RF_MoveDistinctMDs)
+ NewMD = const_cast<MDNode *>(Node);
+ else
+ NewMD = MDNode::replaceWithDistinct(Node->clone());
- return NewMD;
+ // Remap operands later.
+ DistinctWorklist.push_back(NewMD);
+ return mapToMetadata(VM, Node, 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,
+ SmallVectorImpl<MDNode *> &DistinctWorklist,
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.
+ // Create a temporary node and map it upfront in case we have a uniquing
+ // cycle. If necessary, this mapping will get updated by RAUW logic before
+ // returning.
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);
+ mapToMetadata(VM, Node, ClonedMD.get());
+ if (!remapOperands(*ClonedMD, DistinctWorklist, VM, Flags, TypeMapper,
+ Materializer)) {
+ // No operands changed, so use the original.
+ ClonedMD->replaceAllUsesWith(const_cast<MDNode *>(Node));
+ return const_cast<MDNode *>(Node);
+ }
- // At least one operand has changed, so uniquify the cloned node.
- return mapToMetadata(VM, Node,
- MDNode::replaceWithUniqued(std::move(ClonedMD)));
+ // Uniquify the cloned node.
+ return MDNode::replaceWithUniqued(std::move(ClonedMD));
}
static Metadata *MapMetadataImpl(const Metadata *MD,
- SmallVectorImpl<MDNode *> &Cycles,
+ SmallVectorImpl<MDNode *> &DistinctWorklist,
ValueToValueMapTy &VM, RemapFlags Flags,
ValueMapTypeRemapper *TypeMapper,
ValueMaterializer *Materializer) {
assert(Node->isResolved() && "Unexpected unresolved node");
if (Node->isDistinct())
- return mapDistinctNode(Node, Cycles, VM, Flags, TypeMapper, Materializer);
+ return mapDistinctNode(Node, DistinctWorklist, VM, Flags, TypeMapper,
+ Materializer);
- return mapUniquedNode(Node, Cycles, 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> 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");
- }
+ SmallVector<MDNode *, 8> DistinctWorklist;
+ Metadata *NewMD = MapMetadataImpl(MD, DistinctWorklist, VM, Flags, TypeMapper,
+ Materializer);
+
+ // When there are no module-level changes, it's possible that the metadata
+ // graph has temporaries. Skip the logic to resolve cycles, since it's
+ // unnecessary (and invalid) in that case.
+ if (Flags & RF_NoModuleLevelChanges)
+ return NewMD;
+
+ // Resolve cycles involving the entry metadata.
+ resolveCycles(NewMD);
+
+ // Remap the operands of distinct MDNodes.
+ while (!DistinctWorklist.empty())
+ remapOperands(*DistinctWorklist.pop_back_val(), DistinctWorklist, VM, Flags,
+ TypeMapper, Materializer);
return NewMD;
}
// 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) {
- MDNode *Old = MI->second;
+ 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);
+ I->setMetadata(MI.first, New);
}
if (!TypeMapper)
}
if (auto *AI = dyn_cast<AllocaInst>(I))
AI->setAllocatedType(TypeMapper->remapType(AI->getAllocatedType()));
- if (auto *GEP = dyn_cast<GetElementPtrInst>(I))
+ 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()));
}
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