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  1. /*===---- stddef.h - Basic type definitions --------------------------------===
  2.  *
  3.  * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  4.  * See https://llvm.org/LICENSE.txt for license information.
  5.  * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  6.  *
  7.  *===-----------------------------------------------------------------------===
  8.  */
  9.  
  10. #if !defined(__STDDEF_H) || defined(__need_ptrdiff_t) ||                       \
  11.     defined(__need_size_t) || defined(__need_wchar_t) ||                       \
  12.     defined(__need_NULL) || defined(__need_wint_t)
  13.  
  14. #if !defined(__need_ptrdiff_t) && !defined(__need_size_t) &&                   \
  15.     !defined(__need_wchar_t) && !defined(__need_NULL) &&                       \
  16.     !defined(__need_wint_t)
  17. /* Always define miscellaneous pieces when modules are available. */
  18. #if !__has_feature(modules)
  19. #define __STDDEF_H
  20. #endif
  21. #define __need_ptrdiff_t
  22. #define __need_size_t
  23. #define __need_wchar_t
  24. #define __need_NULL
  25. #define __need_STDDEF_H_misc
  26. /* __need_wint_t is intentionally not defined here. */
  27. #endif
  28.  
  29. #if defined(__need_ptrdiff_t)
  30. #if !defined(_PTRDIFF_T) || __has_feature(modules)
  31. /* Always define ptrdiff_t when modules are available. */
  32. #if !__has_feature(modules)
  33. #define _PTRDIFF_T
  34. #endif
  35. typedef __PTRDIFF_TYPE__ ptrdiff_t;
  36. #endif
  37. #undef __need_ptrdiff_t
  38. #endif /* defined(__need_ptrdiff_t) */
  39.  
  40. #if defined(__need_size_t)
  41. #if !defined(_SIZE_T) || __has_feature(modules)
  42. /* Always define size_t when modules are available. */
  43. #if !__has_feature(modules)
  44. #define _SIZE_T
  45. #endif
  46. typedef __SIZE_TYPE__ size_t;
  47. #endif
  48. #undef __need_size_t
  49. #endif /*defined(__need_size_t) */
  50.  
  51. #if defined(__need_STDDEF_H_misc)
  52. /* ISO9899:2011 7.20 (C11 Annex K): Define rsize_t if __STDC_WANT_LIB_EXT1__ is
  53.  * enabled. */
  54. #if (defined(__STDC_WANT_LIB_EXT1__) && __STDC_WANT_LIB_EXT1__ >= 1 && \
  55.      !defined(_RSIZE_T)) || __has_feature(modules)
  56. /* Always define rsize_t when modules are available. */
  57. #if !__has_feature(modules)
  58. #define _RSIZE_T
  59. #endif
  60. typedef __SIZE_TYPE__ rsize_t;
  61. #endif
  62. #endif /* defined(__need_STDDEF_H_misc) */
  63.  
  64. #if defined(__need_wchar_t)
  65. #if !defined(__cplusplus) || (defined(_MSC_VER) && !_NATIVE_WCHAR_T_DEFINED)
  66. /* Always define wchar_t when modules are available. */
  67. #if !defined(_WCHAR_T) || __has_feature(modules)
  68. #if !__has_feature(modules)
  69. #define _WCHAR_T
  70. #if defined(_MSC_EXTENSIONS)
  71. #define _WCHAR_T_DEFINED
  72. #endif
  73. #endif
  74. typedef __WCHAR_TYPE__ wchar_t;
  75. #endif
  76. #endif
  77. #undef __need_wchar_t
  78. #endif /* defined(__need_wchar_t) */
  79.  
  80. #if defined(__need_NULL)
  81. #undef NULL
  82. #ifdef __cplusplus
  83. #  if !defined(__MINGW32__) && !defined(_MSC_VER)
  84. #    define NULL __null
  85. #  else
  86. #    define NULL 0
  87. #  endif
  88. #else
  89. #  define NULL ((void*)0)
  90. #endif
  91. #ifdef __cplusplus
  92. #if defined(_MSC_EXTENSIONS) && defined(_NATIVE_NULLPTR_SUPPORTED)
  93. namespace std { typedef decltype(nullptr) nullptr_t; }
  94. using ::std::nullptr_t;
  95. #endif
  96. #endif
  97. #undef __need_NULL
  98. #endif /* defined(__need_NULL) */
  99.  
  100. /* FIXME: This is using the placeholder dates Clang produces for these macros
  101.    in C2x mode; switch to the correct values once they've been published. */
  102. #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202000L
  103. typedef typeof(nullptr) nullptr_t;
  104. #endif /* defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202000L */
  105.  
  106. #if defined(__need_STDDEF_H_misc)
  107. #if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) ||              \
  108.     (defined(__cplusplus) && __cplusplus >= 201103L)
  109. #include "__stddef_max_align_t.h"
  110. #endif
  111. #define offsetof(t, d) __builtin_offsetof(t, d)
  112. #undef __need_STDDEF_H_misc
  113. #endif  /* defined(__need_STDDEF_H_misc) */
  114.  
  115. /* Some C libraries expect to see a wint_t here. Others (notably MinGW) will use
  116. __WINT_TYPE__ directly; accommodate both by requiring __need_wint_t */
  117. #if defined(__need_wint_t)
  118. /* Always define wint_t when modules are available. */
  119. #if !defined(_WINT_T) || __has_feature(modules)
  120. #if !__has_feature(modules)
  121. #define _WINT_T
  122. #endif
  123. typedef __WINT_TYPE__ wint_t;
  124. #endif
  125. #undef __need_wint_t
  126. #endif /* __need_wint_t */
  127.  
  128. #endif
  129.