add codegen support for __func__ and friends, producing the same

output that GCC does.  rdar://6440297


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@60922 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 10 insertions, 0 deletions

diff --git a/lib/CodeGen/CGExprConstant.cpp b/lib/CodeGen/CGExprConstant.cpp
index 52d99dc60e..2166a5c898 100644
--- a/lib/CodeGen/CGExprConstant.cpp
+++ b/lib/CodeGen/CGExprConstant.cpp
@@ -612,6 +612,16 @@ public:
       }
       break;
     }
+        
+    case Expr::PredefinedExprClass: {
+      // __func__/__FUNCTION__ -> "".  __PRETTY_FUNCTION__ -> "top level".
+      std::string Str;
+      if (cast<PredefinedExpr>(E)->getIdentType() == 
+          PredefinedExpr::PrettyFunction)
+        Str = "top level";
+      
+      return CGM.GetAddrOfConstantCString(Str, ".tmp");
+    }
     }
     CGM.ErrorUnsupported(E, "constant l-value expression");
     llvm::Type *Ty = llvm::PointerType::getUnqual(ConvertType(E->getType()));