1  /* Check jmp_buf sizes, alignments and offsets.
       2     Copyright (C) 2021-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <stddef.h>
      20  #include <setjmp.h>
      21  #include <jmp_buf-macros.h>
      22  
      23  #define SJSTR_HELPER(x) #x
      24  #define SJSTR(x) SJSTR_HELPER(x)
      25  
      26  #define TEST_SIZE(type, size) \
      27    _Static_assert (sizeof (type) == size, \
      28  		  "size of " #type " != " \
      29  		  SJSTR (size))
      30  #define TEST_ALIGN(type, align) \
      31    _Static_assert (__alignof__ (type) == align , \
      32  		  "align of " #type " != " \
      33  		  SJSTR (align))
      34  #define TEST_OFFSET(type, member, offset) \
      35    _Static_assert (offsetof (type, member) == offset, \
      36  		  "offset of " #member " field of " #type " != " \
      37  		  SJSTR (offset))
      38  
      39  /* Check if jmp_buf have the expected sizes.  */
      40  TEST_SIZE (jmp_buf, JMP_BUF_SIZE);
      41  TEST_SIZE (sigjmp_buf, SIGJMP_BUF_SIZE);
      42  
      43  /* Check if jmp_buf have the expected alignments.  */
      44  TEST_ALIGN (jmp_buf, JMP_BUF_ALIGN);
      45  TEST_ALIGN (sigjmp_buf, SIGJMP_BUF_ALIGN);
      46  
      47  /* Check if internal fields in jmp_buf have the expected offsets.  */
      48  TEST_OFFSET (struct __jmp_buf_tag, __mask_was_saved,
      49  	     MASK_WAS_SAVED_OFFSET);
      50  TEST_OFFSET (struct __jmp_buf_tag, __saved_mask,
      51  	     SAVED_MASK_OFFSET);
      52  
      53  int
      54  main (int argc, char *argv[])
      55  {
      56    return 0;
      57  }