cds/compiler/clang/cxx11_atomic_prepatches.h

   1 //$$CDS-header$$
   2
   3 #ifndef __CDS_COMPILER_CLANG_CXX11_ATOMIC_PREPATCHES_H
   4 #define __CDS_COMPILER_CLANG_CXX11_ATOMIC_PREPATCHES_H
   5
   6 #if CDS_CXX11_ATOMIC_SUPPORT == 1
   7 #   if CDS_COMPILER_VERSION == 30100
   8         // Clang 3.1 workaround
   9         // Clang 3.1 does not support __atomic_is_lock_free intrinsic function from GCC
  10         template <typename T>
  11         static inline bool __atomic_is_lock_free( size_t, T* ) CDS_NOEXCEPT
  12         {
  13             return sizeof(T) <= 8;
  14         }
  15
  16         // clang does not implement GCC 4.7 low-level __atomic_xxx intrinsics
  17         // See http://comments.gmane.org/gmane.comp.compilers.clang.devel/20093
  18
  19         // In Clang 3.1 the following workaround results in
  20         //      Assertion `Proto && "Functions without a prototype cannot be overloaded"' failed
  21         // and clang crashed
  22         // So, we cannot use Clang with GCC 4.7 atomics
  23 /*
  24         template <typename T>
  25         static inline void __atomic_load(T *ptr, T *ret, int memmodel)
  26         {
  27             *ret = __atomic_load( ptr, memmodel );
  28         }
  29
  30         template <typename T>
  31         static inline  void __atomic_store(T *ptr, T *val, int memmodel)
  32         {
  33             __atomic_store( ptr, *val, memmodel );
  34         }
  35
  36         template <typename T>
  37         static inline  void __atomic_exchange(T *ptr, T *val, T *ret, int memmodel)
  38         {
  39             *ret =  __atomic_exchange( ptr, *val, memmodel );
  40         }
  41
  42         template <typename T>
  43         static inline  bool __atomic_compare_exchange(T *ptr, T *expected, T *desired, bool weak, int success_memmodel, int failure_memmodel)
  44         {
  45             if ( weak )
  46                 return __atomic_compare_exchange_weak( ptr, expected, *desired, success_memmodel, failure_memmodel );
  47             else
  48                 return __atomic_compare_exchange_strong( ptr, expected, *desired, success_memmodel, failure_memmodel );
  49         }
  50 */
  51 #   endif
  52 #endif
  53
  54 #endif // #ifndef __CDS_COMPILER_CLANG_CXX11_ATOMIC_PREPATCHES_H