Debug Info: Move a helper function getTypeIdentifier from DIBuilder to be part

of DIType.
    
Implement DIType::generateRef to return a type reference. This function will be
used in setContaintingType and in DIBuilder to generete the type reference.
    
No functionality change.

llvm-svn: 190188

1 files changed, 11 insertions, 0 deletions

diff --git a/llvm/lib/IR/DebugInfo.cpp b/llvm/lib/IR/DebugInfo.cpp
index d3207cae350..70b4257caeb 100644
--- a/llvm/lib/IR/DebugInfo.cpp
+++ b/llvm/lib/IR/DebugInfo.cpp
@@ -707,6 +707,17 @@ void DICompositeType::addMember(DIDescriptor D) {
   setTypeArray(DIArray(MDNode::get(DbgNode->getContext(), M)));
 }
 
+/// Generate a reference to this DIType. Uses the type identifier instead
+/// of the actual MDNode if possible, to help type uniquing.
+DITypeRef DIType::generateRef() {
+  if (!isCompositeType())
+    return DITypeRef(*this);
+  DICompositeType DTy(DbgNode);
+  if (!DTy.getIdentifier())
+    return DITypeRef(*this);
+  return DITypeRef(DTy.getIdentifier());
+}
+
 /// \brief Set the containing type.
 void DICompositeType::setContainingType(DICompositeType ContainingType) {
   TrackingVH<MDNode> N(*this);