1 | /*===---- limits.h - Standard header for integer sizes --------------------===*\ |
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 | #ifndef __CLANG_LIMITS_H |
10 | #define __CLANG_LIMITS_H |
11 | |
12 | /* The system's limits.h may, in turn, try to #include_next GCC's limits.h. |
13 | Avert this #include_next madness. */ |
14 | #if defined __GNUC__ && !defined _GCC_LIMITS_H_ |
15 | #define _GCC_LIMITS_H_ |
16 | #endif |
17 | |
18 | /* System headers include a number of constants from POSIX in <limits.h>. |
19 | Include it if we're hosted. */ |
20 | #if __STDC_HOSTED__ && __has_include_next(<limits.h>) |
21 | #include_next <limits.h> |
22 | #endif |
23 | |
24 | /* Many system headers try to "help us out" by defining these. No really, we |
25 | know how big each datatype is. */ |
26 | #undef SCHAR_MIN |
27 | #undef SCHAR_MAX |
28 | #undef UCHAR_MAX |
29 | #undef SHRT_MIN |
30 | #undef SHRT_MAX |
31 | #undef USHRT_MAX |
32 | #undef INT_MIN |
33 | #undef INT_MAX |
34 | #undef UINT_MAX |
35 | #undef LONG_MIN |
36 | #undef LONG_MAX |
37 | #undef ULONG_MAX |
38 | |
39 | #undef CHAR_BIT |
40 | #undef CHAR_MIN |
41 | #undef CHAR_MAX |
42 | |
43 | /* C90/99 5.2.4.2.1 */ |
44 | #define SCHAR_MAX __SCHAR_MAX__ |
45 | #define SHRT_MAX __SHRT_MAX__ |
46 | #define INT_MAX __INT_MAX__ |
47 | #define LONG_MAX __LONG_MAX__ |
48 | |
49 | #define SCHAR_MIN (-__SCHAR_MAX__-1) |
50 | #define SHRT_MIN (-__SHRT_MAX__ -1) |
51 | #define INT_MIN (-__INT_MAX__ -1) |
52 | #define LONG_MIN (-__LONG_MAX__ -1L) |
53 | |
54 | #define UCHAR_MAX (__SCHAR_MAX__*2 +1) |
55 | #if __SHRT_WIDTH__ < __INT_WIDTH__ |
56 | #define USHRT_MAX (__SHRT_MAX__ * 2 + 1) |
57 | #else |
58 | #define USHRT_MAX (__SHRT_MAX__ * 2U + 1U) |
59 | #endif |
60 | #define UINT_MAX (__INT_MAX__ *2U +1U) |
61 | #define ULONG_MAX (__LONG_MAX__ *2UL+1UL) |
62 | |
63 | #ifndef MB_LEN_MAX |
64 | #define MB_LEN_MAX 1 |
65 | #endif |
66 | |
67 | #define CHAR_BIT __CHAR_BIT__ |
68 | |
69 | /* C2x 5.2.4.2.1 */ |
70 | /* FIXME: This is using the placeholder dates Clang produces for these macros |
71 | in C2x mode; switch to the correct values once they've been published. */ |
72 | #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202000L |
73 | #define BOOL_WIDTH __BOOL_WIDTH__ |
74 | #define CHAR_WIDTH CHAR_BIT |
75 | #define SCHAR_WIDTH CHAR_BIT |
76 | #define UCHAR_WIDTH CHAR_BIT |
77 | #define USHRT_WIDTH __SHRT_WIDTH__ |
78 | #define SHRT_WIDTH __SHRT_WIDTH__ |
79 | #define UINT_WIDTH __INT_WIDTH__ |
80 | #define INT_WIDTH __INT_WIDTH__ |
81 | #define ULONG_WIDTH __LONG_WIDTH__ |
82 | #define LONG_WIDTH __LONG_WIDTH__ |
83 | #define ULLONG_WIDTH __LLONG_WIDTH__ |
84 | #define LLONG_WIDTH __LLONG_WIDTH__ |
85 | |
86 | #define BITINT_MAXWIDTH __BITINT_MAXWIDTH__ |
87 | #endif |
88 | |
89 | #ifdef __CHAR_UNSIGNED__ /* -funsigned-char */ |
90 | #define CHAR_MIN 0 |
91 | #define CHAR_MAX UCHAR_MAX |
92 | #else |
93 | #define CHAR_MIN SCHAR_MIN |
94 | #define CHAR_MAX __SCHAR_MAX__ |
95 | #endif |
96 | |
97 | /* C99 5.2.4.2.1: Added long long. |
98 | C++11 18.3.3.2: same contents as the Standard C Library header <limits.h>. |
99 | */ |
100 | #if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) || \ |
101 | (defined(__cplusplus) && __cplusplus >= 201103L) |
102 | |
103 | #undef LLONG_MIN |
104 | #undef LLONG_MAX |
105 | #undef ULLONG_MAX |
106 | |
107 | #define LLONG_MAX __LONG_LONG_MAX__ |
108 | #define LLONG_MIN (-__LONG_LONG_MAX__-1LL) |
109 | #define ULLONG_MAX (__LONG_LONG_MAX__*2ULL+1ULL) |
110 | #endif |
111 | |
112 | /* LONG_LONG_MIN/LONG_LONG_MAX/ULONG_LONG_MAX are a GNU extension. It's too bad |
113 | that we don't have something like #pragma poison that could be used to |
114 | deprecate a macro - the code should just use LLONG_MAX and friends. |
115 | */ |
116 | #if defined(__GNU_LIBRARY__) ? defined(__USE_GNU) : !defined(__STRICT_ANSI__) |
117 | |
118 | #undef LONG_LONG_MIN |
119 | #undef LONG_LONG_MAX |
120 | #undef ULONG_LONG_MAX |
121 | |
122 | #define LONG_LONG_MAX __LONG_LONG_MAX__ |
123 | #define LONG_LONG_MIN (-__LONG_LONG_MAX__-1LL) |
124 | #define ULONG_LONG_MAX (__LONG_LONG_MAX__*2ULL+1ULL) |
125 | #endif |
126 | |
127 | #endif /* __CLANG_LIMITS_H */ |
128 | |