Add some support for dealing with an object pointer on arguments.

Part of rdar://9797999

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163667 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 24 insertions, 0 deletions

diff --git a/lib/VMCore/DIBuilder.cpp b/lib/VMCore/DIBuilder.cpp
index f5894e9a32..6a29a02399 100644
--- a/lib/VMCore/DIBuilder.cpp
+++ b/lib/VMCore/DIBuilder.cpp
@@ -640,6 +640,30 @@ DIType DIBuilder::createArtificialType(DIType Ty) {
   return DIType(MDNode::get(VMContext, Elts));
 }
 
+/// createArtificialType - Create a new DIType with "artificial" flag set.
+DIType DIBuilder::createObjectPointerType(DIType Ty) {
+  if (Ty.isObjectPointer())
+    return Ty;
+
+  SmallVector<Value *, 9> Elts;
+  MDNode *N = Ty;
+  assert (N && "Unexpected input DIType!");
+  for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
+    if (Value *V = N->getOperand(i))
+      Elts.push_back(V);
+    else
+      Elts.push_back(Constant::getNullValue(Type::getInt32Ty(VMContext)));
+  }
+
+  unsigned CurFlags = Ty.getFlags();
+  CurFlags = CurFlags | (DIType::FlagObjectPointer | DIType::FlagArtificial);
+
+  // Flags are stored at this slot.
+  Elts[8] = ConstantInt::get(Type::getInt32Ty(VMContext), CurFlags);
+
+  return DIType(MDNode::get(VMContext, Elts));
+}
+
 /// retainType - Retain DIType in a module even if it is not referenced
 /// through debug info anchors.
 void DIBuilder::retainType(DIType T) {