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alloca.in.h

alloca.in.h 2.2 KB
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  1. /* Memory allocation on the stack.
    2. 

  2.    Copyright (C) 1995, 1999, 2001-2007 Free Software Foundation, Inc.
    3. 

  3. 

  4.    This program is free software: you can redistribute it and/or modify
    5. 

  5.    it under the terms of the GNU General Public License as published by
    6. 

  6.    the Free Software Foundation; either version 3 of the License, or
    7. 

  7.    (at your option) any later version.
    8. 

  8. 

  9.    This program is distributed in the hope that it will be useful,
    10. 

  10.    but WITHOUT ANY WARRANTY; without even the implied warranty of
    11. 

  11.    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    12. 

  12.    GNU General Public License for more details.
    13. 

  13. 

  14.    You should have received a copy of the GNU General Public License
    15. 

  15.    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
    16. 

  16. 

  17. /* When this file is included, it may be preceded only by preprocessor
    18. 

  18.    declarations.  Thanks to AIX.  Therefore we include it right after
    19. 

  19.    "config.h", not later.  */
    20. 

  20. 

  21. /* Avoid using the symbol _ALLOCA_H here, as Bison assumes _ALLOCA_H
    22. 

  22.    means there is a real alloca function.  */
    23. 

  23. #ifndef _GL_ALLOCA_H
    24. 

  24. #define _GL_ALLOCA_H
    25. 

  25. 

  26. /* alloca(N) returns a pointer (void* or char*) to N bytes of memory
    27. 

  27.    allocated on the stack, and which will last until the function returns.
    28. 

  28.    Use of alloca should be avoided:
    29. 

  29.      - inside arguments of function calls - undefined behaviour,
    30. 

  30.      - in inline functions - the allocation may actually last until the
    31. 

  31.        calling function returns,
    32. 

  32.      - for huge N (say, N >= 65536) - you never know how large (or small)
    33. 

  33.        the stack is, and when the stack cannot fulfill the memory allocation
    34. 

  34.        request, the program just crashes.
    35. 

  35.  */
    36. 

  36. 

  37. #ifndef alloca
    38. 

  38. # ifdef __GNUC__
    39. 

  39. #   define alloca __builtin_alloca
    40. 

  40. # else
    41. 

  41. #  ifdef _MSC_VER
    42. 

  42. #   include <malloc.h>
    43. 

  43. #   define alloca _alloca
    44. 

  44. #  else
    45. 

  45. #   if HAVE_ALLOCA_H
    46. 

  46. #    include <alloca.h>
    47. 

  47. #   else
    48. 

  48. #    ifdef _AIX
    49. 

  49.  #pragma alloca
    50. 

  50. #    else
    51. 

  51. #     ifdef __hpux /* This section must match that of bison generated files. */
    52. 

  52. #      ifdef __cplusplus
    53. 

  53. extern "C" void *alloca (unsigned int);
    54. 

  54. #      else /* not __cplusplus */
    55. 

  55. extern void *alloca ();
    56. 

  56. #      endif /* not __cplusplus */
    57. 

  57. #     else /* not __hpux */
    58. 

  58. #      ifndef alloca
    59. 

  59. extern char *alloca ();
    60. 

  60. #      endif
    61. 

  61. #     endif /* __hpux */
    62. 

  62. #    endif
    63. 

  63. #   endif
    64. 

  64. #  endif
    65. 

  65. # endif
    66. 

  66. #endif
    67. 

  67. 

  68. #endif /* _GL_ALLOCA_H */
    69.