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Utils: Separate out mapDistinctNode(), NFC 

llvm-svn: 225902
This commit is contained in:
Duncan P. N. Exon Smith 2015-01-14 01:03:05 +00:00
parent 3956a85e6e
commit 14cc94c1c6
1 changed files with 24 additions and 14 deletions
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38
llvm/lib/Transforms/Utils/ValueMapper.cpp
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@ -180,6 +180,28 @@ static Metadata *mapMetadataOp(Metadata *Op, ValueToValueMapTy &VM,
return nullptr;
}
/// \brief Map a distinct MDNode.
///
/// Distinct nodes are not uniqued, so they must always recreated.
static Metadata *mapDistinctNode(const MDNode *Node, ValueToValueMapTy &VM,
RemapFlags Flags,
ValueMapTypeRemapper *TypeMapper,
ValueMaterializer *Materializer) {
assert(Node->isDistinct() && "Expected distinct node");
// Create the node first so it's available for cyclical references.
SmallVector<Metadata *, 4> EmptyOps(Node->getNumOperands());
MDTuple *NewMD = MDTuple::getDistinct(Node->getContext(), EmptyOps);
mapToMetadata(VM, Node, NewMD);
// Fix the operands.
for (unsigned I = 0, E = Node->getNumOperands(); I != E; ++I)
NewMD->replaceOperandWith(I, mapMetadataOp(Node->getOperand(I), VM, Flags,
TypeMapper, Materializer));
return NewMD;
}
static Metadata *MapMetadataImpl(const Metadata *MD, ValueToValueMapTy &VM,
RemapFlags Flags,
ValueMapTypeRemapper *TypeMapper,
@ -220,20 +242,8 @@ static Metadata *MapMetadataImpl(const Metadata *MD, ValueToValueMapTy &VM,
if (Flags & RF_NoModuleLevelChanges)
return mapToSelf(VM, MD);
// Distinct nodes are always recreated.
if (Node->isDistinct()) {
// Create the node first so it's available for cyclical references.
SmallVector<Metadata *, 4> EmptyOps(Node->getNumOperands());
MDTuple *NewMD = MDTuple::getDistinct(Node->getContext(), EmptyOps);
mapToMetadata(VM, Node, NewMD);
// Fix the operands.
for (unsigned I = 0, E = Node->getNumOperands(); I != E; ++I)
NewMD->replaceOperandWith(I, mapMetadataOp(Node->getOperand(I), VM, Flags,
TypeMapper, Materializer));
return NewMD;
}
if (Node->isDistinct())
return mapDistinctNode(Node, VM, Flags, TypeMapper, Materializer);
// Create a dummy node in case we have a metadata cycle.
MDNodeFwdDecl *Dummy = MDNode::getTemporary(Node->getContext(), None);