//===----------------------------------------------------------------------===//
#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;
// Out of line method to get vtable etc for class.
void ValueMapTypeRemapper::anchor() {}
void ValueMaterializer::anchor() {}
+void ValueMaterializer::materializeInitFor(GlobalValue *New, GlobalValue *Old) {
+}
Value *llvm::MapValue(const Value *V, ValueToValueMapTy &VM, RemapFlags Flags,
ValueMapTypeRemapper *TypeMapper,
// 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;
+ if (Value *NewV =
+ Materializer->materializeDeclFor(const_cast<Value *>(V))) {
+ VM[V] = NewV;
+ if (auto *NewGV = dyn_cast<GlobalValue>(NewV))
+ Materializer->materializeInitFor(
+ NewGV, const_cast<GlobalValue *>(cast<GlobalValue>(V)));
+ return NewV;
+ }
}
// Global values do not need to be seeded into the VM if they
// are using the identity mapping.
- if (isa<GlobalValue>(V))
+ if (isa<GlobalValue>(V)) {
+ if (Flags & RF_NullMapMissingGlobalValues) {
+ assert(!(Flags & RF_IgnoreMissingEntries) &&
+ "Illegal to specify both RF_NullMapMissingGlobalValues and "
+ "RF_IgnoreMissingEntries");
+ return nullptr;
+ }
return VM[V] = const_cast<Value*>(V);
-
+ }
+
if (const InlineAsm *IA = dyn_cast<InlineAsm>(V)) {
// Inline asm may need *type* remapping.
FunctionType *NewTy = IA->getFunctionType();
if (!isa<LocalAsMetadata>(MD) && (Flags & RF_NoModuleLevelChanges))
return VM[V] = const_cast<Value *>(V);
- auto *MappedMD = MapValue(MD, VM, Flags, TypeMapper, Materializer);
+ auto *MappedMD = MapMetadata(MD, VM, Flags, TypeMapper, Materializer);
if (MD == MappedMD || (!MappedMD && (Flags & RF_IgnoreMissingEntries)))
return VM[V] = const_cast<Value *>(V);
// correct. For now, just match behaviour from before the metadata/value
// split.
//
- // assert(MappedMD && "Referenced metadata value not in value map");
+ // assert((MappedMD || (Flags & RF_NullMapMissingGlobalValues)) &&
+ // "Referenced metadata value not in value map");
return VM[V] = MetadataAsValue::get(V->getContext(), MappedMD);
}
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 *mapToMetadata(ValueToValueMapTy &VM, const Metadata *Key,
- Metadata *Val) {
+ Metadata *Val, ValueMaterializer *Materializer,
+ RemapFlags Flags) {
VM.MD()[Key].reset(Val);
+ if (Materializer && !(Flags & RF_HaveUnmaterializedMetadata)) {
+ auto *N = dyn_cast_or_null<MDNode>(Val);
+ // Need to invoke this once we have non-temporary MD.
+ if (!N || !N->isTemporary())
+ Materializer->replaceTemporaryMetadata(Key, Val);
+ }
return Val;
}
-static Metadata *mapToSelf(ValueToValueMapTy &VM, const Metadata *MD) {
- return mapToMetadata(VM, MD, const_cast<Metadata *>(MD));
+static Metadata *mapToSelf(ValueToValueMapTy &VM, const Metadata *MD,
+ ValueMaterializer *Materializer, RemapFlags Flags) {
+ return mapToMetadata(VM, MD, const_cast<Metadata *>(MD), Materializer, Flags);
+}
+
+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 (Materializer && !Materializer->isMetadataNeeded(Op))
+ return nullptr;
+
+ 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 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.
+ //
+ // assert((Flags & RF_NullMapMissingGlobalValues) &&
+ // "Referenced metadata not in value map!");
+ return nullptr;
+}
+
+/// Resolve uniquing cycles involving the given metadata.
+static void resolveCycles(Metadata *MD, bool AllowTemps) {
+ if (auto *N = dyn_cast_or_null<MDNode>(MD)) {
+ if (AllowTemps && N->isTemporary())
+ return;
+ if (!N->isResolved()) {
+ if (AllowTemps)
+ // Note that this will drop RAUW support on any temporaries, which
+ // blocks uniquing. If this ends up being an issue, in the future
+ // we can experiment with delaying resolving these nodes until
+ // after metadata is fully materialized (i.e. when linking metadata
+ // as a postpass after function importing).
+ N->resolveNonTemporaries();
+ else
+ N->resolveCycles();
+ }
+ }
}
-static Metadata *MapValueImpl(const Metadata *MD, ValueToValueMapTy &VM,
- RemapFlags Flags,
- ValueMapTypeRemapper *TypeMapper,
- ValueMaterializer *Materializer) {
+/// Remap the operands of an MDNode.
+///
+/// If \c Node is temporary, uniquing cycles are ignored. If \c Node is
+/// distinct, uniquing cycles are resolved as they're found.
+///
+/// \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();
+
+ 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);
+
+ // Resolve uniquing cycles underneath distinct nodes on the fly so they
+ // don't infect later operands.
+ if (IsDistinct)
+ resolveCycles(New, Flags & RF_HaveUnmaterializedMetadata);
+ }
+ }
+
+ return AnyChanged;
+}
+
+/// Map a distinct MDNode.
+///
+/// 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 *> &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());
+
+ // Remap operands later.
+ DistinctWorklist.push_back(NewMD);
+ return mapToMetadata(VM, Node, NewMD, Materializer, Flags);
+}
+
+/// \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 *> &DistinctWorklist,
+ ValueToValueMapTy &VM, RemapFlags Flags,
+ ValueMapTypeRemapper *TypeMapper,
+ ValueMaterializer *Materializer) {
+ assert(((Flags & RF_HaveUnmaterializedMetadata) || Node->isUniqued()) &&
+ "Expected uniqued node");
+
+ // 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();
+ mapToMetadata(VM, Node, ClonedMD.get(), Materializer, Flags);
+ if (!remapOperands(*ClonedMD, DistinctWorklist, VM, Flags, TypeMapper,
+ Materializer)) {
+ // No operands changed, so use the original.
+ ClonedMD->replaceAllUsesWith(const_cast<MDNode *>(Node));
+ // Even though replaceAllUsesWith would have replaced the value map
+ // entry, we need to explictly map with the final non-temporary node
+ // to replace any temporary metadata via the callback.
+ return mapToSelf(VM, Node, Materializer, Flags);
+ }
+
+ // Uniquify the cloned node. Explicitly map it with the final non-temporary
+ // node so that replacement of temporary metadata via the callback occurs.
+ return mapToMetadata(VM, Node,
+ MDNode::replaceWithUniqued(std::move(ClonedMD)),
+ Materializer, Flags);
+}
+
+static Metadata *MapMetadataImpl(const Metadata *MD,
+ SmallVectorImpl<MDNode *> &DistinctWorklist,
+ 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);
+ return mapToSelf(VM, MD, Materializer, Flags);
if (isa<ConstantAsMetadata>(MD))
if ((Flags & RF_NoModuleLevelChanges))
- return mapToSelf(VM, MD);
+ return mapToSelf(VM, MD, Materializer, Flags);
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);
+ return mapToSelf(VM, MD, Materializer, Flags);
// 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!");
+ // assert((MappedV || (Flags & RF_NullMapMissingGlobalValues)) &&
+ // "Referenced metadata not in value map!");
if (MappedV)
- return mapToMetadata(VM, MD, ValueAsMetadata::get(MappedV));
+ return mapToMetadata(VM, MD, ValueAsMetadata::get(MappedV), Materializer,
+ Flags);
return nullptr;
}
+ // Note: this cast precedes the Flags check so we always get its associated
+ // assertion.
const MDNode *Node = cast<MDNode>(MD);
- assert(Node->isResolved() && "Unexpected unresolved node");
-
- auto getMappedOp = [&](Metadata *Op) -> Metadata *{
- if (!Op)
- return nullptr;
- if (Metadata *MappedOp =
- MapValueImpl(Op, 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;
- };
// 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);
-
- // Create a dummy node in case we have a metadata cycle.
- MDNodeFwdDecl *Dummy = MDNode::getTemporary(Node->getContext(), None);
- mapToMetadata(VM, Node, Dummy);
-
- // Check all operands to see if any need to be remapped.
- for (unsigned I = 0, E = Node->getNumOperands(); I != E; ++I) {
- Metadata *Op = Node->getOperand(I);
- Metadata *MappedOp = getMappedOp(Op);
- if (Op == MappedOp)
- continue;
-
- // Ok, at least one operand needs remapping.
- SmallVector<Metadata *, 4> Elts;
- Elts.reserve(Node->getNumOperands());
- for (I = 0; I != E; ++I)
- Elts.push_back(getMappedOp(Node->getOperand(I)));
-
- MDNode *NewMD = MDNode::get(Node->getContext(), Elts);
- Dummy->replaceAllUsesWith(NewMD);
- MDNode::deleteTemporary(Dummy);
- return mapToMetadata(VM, Node, NewMD);
+ return mapToSelf(VM, MD, Materializer, Flags);
+
+ // Require resolved nodes whenever metadata might be remapped.
+ assert(((Flags & RF_HaveUnmaterializedMetadata) || Node->isResolved()) &&
+ "Unexpected unresolved node");
+
+ if (Materializer && Node->isTemporary()) {
+ assert(Flags & RF_HaveUnmaterializedMetadata);
+ Metadata *TempMD =
+ Materializer->mapTemporaryMetadata(const_cast<Metadata *>(MD));
+ // If the above callback returned an existing temporary node, use it
+ // instead of the current temporary node. This happens when earlier
+ // function importing passes already created and saved a temporary
+ // metadata node for the same value id.
+ if (TempMD) {
+ mapToMetadata(VM, MD, TempMD, Materializer, Flags);
+ return TempMD;
+ }
}
- // No operands needed remapping. Use an identity mapping.
- mapToSelf(VM, MD);
- MDNode::deleteTemporary(Dummy);
- return const_cast<Metadata *>(MD);
+ if (Node->isDistinct())
+ return mapDistinctNode(Node, DistinctWorklist, VM, Flags, TypeMapper,
+ Materializer);
+
+ return mapUniquedNode(Node, DistinctWorklist, VM, Flags, TypeMapper,
+ Materializer);
}
-Metadata *llvm::MapValue(const Metadata *MD, ValueToValueMapTy &VM,
- RemapFlags Flags, ValueMapTypeRemapper *TypeMapper,
- ValueMaterializer *Materializer) {
- Metadata *NewMD = MapValueImpl(MD, VM, Flags, TypeMapper, Materializer);
- if (NewMD && NewMD != MD)
- if (auto *G = dyn_cast<GenericMDNode>(NewMD))
- G->resolveCycles();
+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);
+
+ // 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, Flags & RF_HaveUnmaterializedMetadata);
+
+ // Remap the operands of distinct MDNodes.
+ while (!DistinctWorklist.empty())
+ remapOperands(*DistinctWorklist.pop_back_val(), DistinctWorklist, VM, Flags,
+ TypeMapper, Materializer);
+
return NewMD;
}
-MDNode *llvm::MapValue(const MDNode *MD, ValueToValueMapTy &VM,
- RemapFlags Flags, ValueMapTypeRemapper *TypeMapper,
- ValueMaterializer *Materializer) {
- return cast<MDNode>(MapValue(static_cast<const Metadata *>(MD), VM, Flags,
- TypeMapper, Materializer));
+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
// 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;
- MDNode *New = MapValue(Old, VMap, Flags, TypeMapper, Materializer);
+ 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)
+ 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()));
+ GEP->setResultElementType(
+ TypeMapper->remapType(GEP->getResultElementType()));
+ }
+ I->mutateType(TypeMapper->remapType(I->getType()));
}
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