Allow reference binding of a reference of Objective-C object type to

an lvalue of another, compatible Objective-C object type (e.g., a
subclass). Introduce a new initialization sequence step kind to
describe this binding, along with a new cast kind. Fixes PR7741.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@110513 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 7 insertions, 0 deletions

diff --git a/lib/CodeGen/CGExpr.cpp b/lib/CodeGen/CGExpr.cpp
index 9424776898..e2ccf55f93 100644
--- a/lib/CodeGen/CGExpr.cpp
+++ b/lib/CodeGen/CGExpr.cpp
@@ -1851,6 +1851,13 @@ LValue CodeGenFunction::EmitCastLValue(const CastExpr *E) {
                                            ConvertType(CE->getTypeAsWritten()));
     return LValue::MakeAddr(V, MakeQualifiers(E->getType()));
   }
+  case CastExpr::CK_ObjCObjectLValueCast: {
+    LValue LV = EmitLValue(E->getSubExpr());
+    QualType ToType = getContext().getLValueReferenceType(E->getType());
+    llvm::Value *V = Builder.CreateBitCast(LV.getAddress(), 
+                                           ConvertType(ToType));
+    return LValue::MakeAddr(V, MakeQualifiers(E->getType()));
+  }
   }
   
   llvm_unreachable("Unhandled lvalue cast kind?");