Add attributes for preserve_mostcc/preserve_allcc calling conventions to the C/C++ front-end

Till now, preserve_mostcc/preserve_allcc calling convention attributes were only
available at the LLVM IR level. This patch adds attributes for
preserve_mostcc/preserve_allcc calling conventions to the C/C++ front-end.

The code was mostly written by Juergen Ributzka.
I just added support for the AArch64 target and tests.

Differential Revision: http://reviews.llvm.org/D18025

llvm-svn: 263647

1 files changed, 12 insertions, 1 deletions

diff --git a/clang/lib/Sema/SemaDeclAttr.cpp b/clang/lib/Sema/SemaDeclAttr.cpp
index 0cae52a299f..725b08a422a 100644
--- a/clang/lib/Sema/SemaDeclAttr.cpp
+++ b/clang/lib/Sema/SemaDeclAttr.cpp
@@ -3799,7 +3799,14 @@ static void handleCallConvAttr(Sema &S, Decl *D, const AttributeList &Attr) {
                IntelOclBiccAttr(Attr.getRange(), S.Context,
                                 Attr.getAttributeSpellingListIndex()));
     return;
-
+  case AttributeList::AT_PreserveMost:
+    D->addAttr(::new (S.Context) PreserveMostAttr(
+        Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
+    return;
+  case AttributeList::AT_PreserveAll:
+    D->addAttr(::new (S.Context) PreserveAllAttr(
+        Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
+    return;
   default:
     llvm_unreachable("unexpected attribute kind");
   }
@@ -3857,6 +3864,8 @@ bool Sema::CheckCallingConvAttr(const AttributeList &attr, CallingConv &CC,
     return true;
   }
   case AttributeList::AT_IntelOclBicc: CC = CC_IntelOclBicc; break;
+  case AttributeList::AT_PreserveMost: CC = CC_PreserveMost; break;
+  case AttributeList::AT_PreserveAll: CC = CC_PreserveAll; break;
   default: llvm_unreachable("unexpected attribute kind");
   }
 
@@ -5655,6 +5664,8 @@ static void ProcessDeclAttribute(Sema &S, Scope *scope, Decl *D,
   case AttributeList::AT_SysVABI:
   case AttributeList::AT_Pcs:
   case AttributeList::AT_IntelOclBicc:
+  case AttributeList::AT_PreserveMost:
+  case AttributeList::AT_PreserveAll:
     handleCallConvAttr(S, D, Attr);
     break;
   case AttributeList::AT_OpenCLKernel: