IR: Introduce GenericDwarfNode

As part of PR22235, introduce `DwarfNode` and `GenericDwarfNode`.  The
former is a metadata node with a DWARF tag.  The latter matches our
current (generic) schema of a header with string (and stringified
integer) data and an arbitrary number of operands.

This doesn't move it into place yet; that change will require a large
number of testcase updates.

llvm-svn: 226529

1 files changed, 8 insertions, 0 deletions

diff --git a/llvm/lib/Transforms/Utils/ValueMapper.cpp b/llvm/lib/Transforms/Utils/ValueMapper.cpp
index 20ce27823fb..cba4677a2b0 100644
--- a/llvm/lib/Transforms/Utils/ValueMapper.cpp
+++ b/llvm/lib/Transforms/Utils/ValueMapper.cpp
@@ -192,6 +192,14 @@ static TempMDLocation cloneMDLocation(const MDLocation *Node) {
                                   Node->getInlinedAt());
 }
 
+static TempGenericDwarfNode
+cloneGenericDwarfNode(const GenericDwarfNode *Node) {
+  SmallVector<Metadata *, 4> DwarfOps;
+  DwarfOps.append(Node->dwarf_op_begin(), Node->dwarf_op_end());
+  return GenericDwarfNode::getTemporary(Node->getContext(), Node->getTag(),
+                                        Node->getHeader(), DwarfOps);
+}
+
 static TempMDNode cloneMDNode(const MDNode *Node) {
   switch (Node->getMetadataID()) {
   default: