OpenCL: CL2.0 atomic types

OpenCL C Spec v2.0 Section 6.13.11

- Made c11 _Atomic being not accepted for OpenCL

- Implemented CL2.0 atomics by aliasing them to the corresponding c11 atomic types using implicit typedef

- Added diagnostics for atomics Khronos extension enabling

llvm-svn: 232631

1 files changed, 11 insertions, 4 deletions

diff --git a/clang/lib/Basic/IdentifierTable.cpp b/clang/lib/Basic/IdentifierTable.cpp
index db148f493f4..bd2840db4c7 100644
--- a/clang/lib/Basic/IdentifierTable.cpp
+++ b/clang/lib/Basic/IdentifierTable.cpp
@@ -106,9 +106,11 @@ namespace {
     KEYC11 = 0x400,
     KEYARC = 0x800,
     KEYNOMS18 = 0x01000,
-    WCHARSUPPORT = 0x02000,
-    HALFSUPPORT = 0x04000,
-    KEYALL = (0xffff & ~KEYNOMS18) // Because KEYNOMS18 is used to exclude.
+    KEYNOOPENCL = 0x02000,
+    WCHARSUPPORT = 0x04000,
+    HALFSUPPORT = 0x08000,
+    KEYALL = (0xffff & ~KEYNOMS18 &
+              ~KEYNOOPENCL) // KEYNOMS18 and KEYNOOPENCL are used to exclude.
   };
 
   /// \brief How a keyword is treated in the selected standard.
@@ -156,7 +158,12 @@ static void AddKeyword(StringRef Keyword,
   // Don't add this keyword under MSVCCompat.
   if (LangOpts.MSVCCompat && (Flags & KEYNOMS18) &&
       !LangOpts.isCompatibleWithMSVC(19))
-     return;
+    return;
+
+  // Don't add this keyword under OpenCL.
+  if (LangOpts.OpenCL && (Flags & KEYNOOPENCL))
+    return;
+
   // Don't add this keyword if disabled in this language.
   if (AddResult == KS_Disabled) return;