Logan Chien | 2833ffb | 2018-10-09 10:03:24 +0800 | [diff] [blame] | 1 | /*===---- stddef.h - Basic type definitions --------------------------------=== |
| 2 | * |
Logan Chien | df4f766 | 2019-09-04 16:45:23 -0700 | [diff] [blame] | 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 |
Logan Chien | 2833ffb | 2018-10-09 10:03:24 +0800 | [diff] [blame] | 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 | #ifndef __cplusplus |
| 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 | #if defined(__need_STDDEF_H_misc) |
| 101 | #if __STDC_VERSION__ >= 201112L || __cplusplus >= 201103L |
| 102 | #include "__stddef_max_align_t.h" |
| 103 | #endif |
| 104 | #define offsetof(t, d) __builtin_offsetof(t, d) |
| 105 | #undef __need_STDDEF_H_misc |
| 106 | #endif /* defined(__need_STDDEF_H_misc) */ |
| 107 | |
| 108 | /* Some C libraries expect to see a wint_t here. Others (notably MinGW) will use |
| 109 | __WINT_TYPE__ directly; accommodate both by requiring __need_wint_t */ |
| 110 | #if defined(__need_wint_t) |
| 111 | /* Always define wint_t when modules are available. */ |
| 112 | #if !defined(_WINT_T) || __has_feature(modules) |
| 113 | #if !__has_feature(modules) |
| 114 | #define _WINT_T |
| 115 | #endif |
| 116 | typedef __WINT_TYPE__ wint_t; |
| 117 | #endif |
| 118 | #undef __need_wint_t |
| 119 | #endif /* __need_wint_t */ |
| 120 | |
| 121 | #endif |