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Utils: Extract mapUniquedNode(), NFC

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225905 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan P. N. Exon Smith 2015-01-14 01:06:21 +00:00
parent 504fa89c8e
commit 5f1f94e4c5
1 changed files with 40 additions and 28 deletions

68
lib/Transforms/Utils/ValueMapper.cpp

@ -202,6 +202,45 @@ static Metadata *mapDistinctNode(const UniquableMDNode *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 UniquableMDNode *Node,
ValueToValueMapTy &VM, RemapFlags Flags,
ValueMapTypeRemapper *TypeMapper,
ValueMaterializer *Materializer) {
assert(!Node->isDistinct() && "Expected uniqued node");
// 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 = mapMetadataOp(Op, VM, Flags, TypeMapper, Materializer);
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(mapMetadataOp(Node->getOperand(I), VM, Flags, TypeMapper,
Materializer));
MDNode *NewMD = MDTuple::get(Node->getContext(), Elts);
Dummy->replaceAllUsesWith(NewMD);
MDNode::deleteTemporary(Dummy);
return mapToMetadata(VM, Node, NewMD);
}
// No operands needed remapping. Use an identity mapping.
mapToSelf(VM, Node);
MDNode::deleteTemporary(Dummy);
return const_cast<Metadata *>(static_cast<const Metadata *>(Node));
}
static Metadata *MapMetadataImpl(const Metadata *MD, ValueToValueMapTy &VM,
RemapFlags Flags,
ValueMapTypeRemapper *TypeMapper,
@ -245,34 +284,7 @@ static Metadata *MapMetadataImpl(const Metadata *MD, ValueToValueMapTy &VM,
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);
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 = mapMetadataOp(Op, VM, Flags, TypeMapper, Materializer);
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(mapMetadataOp(Node->getOperand(I), VM, Flags, TypeMapper,
Materializer));
MDNode *NewMD = MDTuple::get(Node->getContext(), Elts);
Dummy->replaceAllUsesWith(NewMD);
MDNode::deleteTemporary(Dummy);
return mapToMetadata(VM, Node, NewMD);
}
// No operands needed remapping. Use an identity mapping.
mapToSelf(VM, MD);
MDNode::deleteTemporary(Dummy);
return const_cast<Metadata *>(MD);
return mapUniquedNode(Node, VM, Flags, TypeMapper, Materializer);
}
Metadata *llvm::MapMetadata(const Metadata *MD, ValueToValueMapTy &VM,