Unreachable.h

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//============================================================================
//  Copyright (c) Kitware, Inc.
//  All rights reserved.
//  See LICENSE.txt for details.
//
//  This software is distributed WITHOUT ANY WARRANTY; without even
//  the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
//  PURPOSE.  See the above copyright notice for more information.
//============================================================================
 
#ifndef vtk_m_Unreachable_h
#define vtk_m_Unreachable_h
 
#define VTKM_UNREACHABLE(msg)      \
  VTKM_SWALLOW_SEMICOLON_PRE_BLOCK \
  {                                \
    VTKM_UNREACHABLE_IMPL();       \
    VTKM_UNREACHABLE_PRINT(msg);   \
    VTKM_UNREACHABLE_ABORT();      \
  }                                \
  VTKM_SWALLOW_SEMICOLON_POST_BLOCK
 
// VTKM_UNREACHABLE_IMPL is compiler-specific:
#if defined(VTKM_CUDA_DEVICE_PASS)
 
#define VTKM_UNREACHABLE_IMPL() (void)0 /* no-op, no known intrinsic */
 
#if defined(NDEBUG) || defined(VTKM_NO_ASSERT)
 
#define VTKM_UNREACHABLE_PRINT(msg) (void)0 /* no-op */
#define VTKM_UNREACHABLE_ABORT() (void)0    /* no-op */
 
#else // NDEBUG || VTKM_NO_ASSERT
 
#define VTKM_UNREACHABLE_PRINT(msg) \
  printf("Unreachable location reached: %s\nLocation: %s:%d\n", msg, __FILE__, __LINE__)
#define VTKM_UNREACHABLE_ABORT() \
  asm("trap;") /* Triggers kernel exit with CUDA error 73: Illegal inst */
 
#endif // NDEBUG || VTKM_NO_ASSERT
 
#else // !CUDA
 
 
#if defined(NDEBUG) || defined(VTKM_NO_ASSERT)
 
#define VTKM_UNREACHABLE_PRINT(msg) (void)0 /* no-op */
#define VTKM_UNREACHABLE_ABORT() (void)0    /* no-op */
 
#if defined(VTKM_MSVC)
#define VTKM_UNREACHABLE_IMPL() __assume(false)
#elif defined(VTKM_ICC) && !defined(__GNUC__)
#define VTKM_UNREACHABLE_IMPL() __assume(false)
#elif (defined(VTKM_GCC) || defined(VTKM_ICC)) && \
  (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5))
// Added in 4.5.0:
#define VTKM_UNREACHABLE_IMPL() __builtin_unreachable()
#elif defined(VTKM_CLANG)
#define VTKM_UNREACHABLE_IMPL() __builtin_unreachable()
#else
#define VTKM_UNREACHABLE_IMPL() (void)0 /* no-op */
#endif
 
#else // NDEBUG || VTKM_NO_ASSERT
 
#define VTKM_UNREACHABLE_IMPL() (void)0
#define VTKM_UNREACHABLE_PRINT(msg)                            \
  std::cerr << "Unreachable location reached: " << msg << "\n" \
            << "Location: " << __FILE__ << ":" << __LINE__ << "\n"
#define VTKM_UNREACHABLE_ABORT() abort()
 
#endif // NDEBUG && !VTKM_NO_ASSERT
 
#endif // !CUDA
 
#endif //vtk_m_Unreachable_h