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) && defined(__STDC_VERSION__) && \ |
107 | __STDC_VERSION__ >= 202000L |
108 | #define unreachable() __builtin_unreachable() |
109 | #endif /* defined(__need_STDDEF_H_misc) && >= C23 */ |
110 | |
111 | #if defined(__need_STDDEF_H_misc) |
112 | #if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) || \ |
113 | (defined(__cplusplus) && __cplusplus >= 201103L) |
114 | #include "__stddef_max_align_t.h" |
115 | #endif |
116 | #define offsetof(t, d) __builtin_offsetof(t, d) |
117 | #undef __need_STDDEF_H_misc |
118 | #endif /* defined(__need_STDDEF_H_misc) */ |
119 | |
120 | /* Some C libraries expect to see a wint_t here. Others (notably MinGW) will use |
121 | __WINT_TYPE__ directly; accommodate both by requiring __need_wint_t */ |
122 | #if defined(__need_wint_t) |
123 | /* Always define wint_t when modules are available. */ |
124 | #if !defined(_WINT_T) || __has_feature(modules) |
125 | #if !__has_feature(modules) |
126 | #define _WINT_T |
127 | #endif |
128 | typedef __WINT_TYPE__ wint_t; |
129 | #endif |
130 | #undef __need_wint_t |
131 | #endif /* __need_wint_t */ |
132 | |
133 | #endif |
134 | |