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   1 /****************************************************************************
   2 **
   3 ** Copyright (C) 2017 Intel Corporation
   4 **
   5 ** Permission is hereby granted, free of charge, to any person obtaining a copy
   6 ** of this software and associated documentation files (the "Software"), to deal
   7 ** in the Software without restriction, including without limitation the rights
   8 ** to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   9 ** copies of the Software, and to permit persons to whom the Software is
  10 ** furnished to do so, subject to the following conditions:
  11 **
  12 ** The above copyright notice and this permission notice shall be included in
  13 ** all copies or substantial portions of the Software.
  14 **
  15 ** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16 ** IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17 ** FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  18 ** AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19 ** LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20 ** OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  21 ** THE SOFTWARE.
  22 **
  23 ****************************************************************************/
  24
  25 #ifndef COMPILERSUPPORT_H
  26 #define COMPILERSUPPORT_H
  27
  28 #include "cbor.h"
  29
  30 #ifndef _BSD_SOURCE
  31 #  define _BSD_SOURCE
  32 #endif
  33 #ifndef _DEFAULT_SOURCE
  34 #  define _DEFAULT_SOURCE
  35 #endif
  36 #ifndef assert
  37 #  include <assert.h>
  38 #endif
  39 #include <stddef.h>
  40 #include <stdint.h>
  41 #include <string.h>
  42
  43 #ifndef __cplusplus
  44 #  include <stdbool.h>
  45 #endif
  46
  47 #if __STDC_VERSION__ >= 201112L || __cplusplus >= 201103L || __cpp_static_assert >= 200410
  48 #  define cbor_static_assert(x)         static_assert(x, #x)
  49 #elif !defined(__cplusplus) && defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ >= 406) && (__STDC_VERSION__ > 199901L)
  50 #  define cbor_static_assert(x)         _Static_assert(x, #x)
  51 #else
  52 #  define cbor_static_assert(x)         ((void)sizeof(char[2*!!(x) - 1]))
  53 #endif
  54 #if __STDC_VERSION__ >= 199901L || defined(__cplusplus)
  55 /* inline is a keyword */
  56 #else
  57 /* use the definition from cbor.h */
  58 #  define inline    CBOR_INLINE
  59 #endif
  60
  61 #ifdef NDEBUG
  62 #  define cbor_assert(cond)     do { if (!(cond)) unreachable(); } while (0)
  63 #else
  64 #  define cbor_assert(cond)     assert(cond)
  65 #endif
  66
  67 #ifndef STRINGIFY
  68 #define STRINGIFY(x)            STRINGIFY2(x)
  69 #endif
  70 #define STRINGIFY2(x)           #x
  71
  72 #if !defined(UINT32_MAX) || !defined(INT64_MAX)
  73 /* C89? We can define UINT32_MAX portably, but not INT64_MAX */
  74 #  error "Your system has stdint.h but that doesn't define UINT32_MAX or INT64_MAX"
  75 #endif
  76
  77 #ifndef DBL_DECIMAL_DIG
  78 /* DBL_DECIMAL_DIG is C11 */
  79 #  define DBL_DECIMAL_DIG       17
  80 #endif
  81 #define DBL_DECIMAL_DIG_STR     STRINGIFY(DBL_DECIMAL_DIG)
  82
  83 #if defined(__GNUC__) && defined(__i386__) && !defined(__iamcu__)
  84 #  define CBOR_INTERNAL_API_CC          __attribute__((regparm(3)))
  85 #elif defined(_MSC_VER) && defined(_M_IX86)
  86 #  define CBOR_INTERNAL_API_CC          __fastcall
  87 #else
  88 #  define CBOR_INTERNAL_API_CC
  89 #endif
  90
  91 #ifndef __has_builtin
  92 #  define __has_builtin(x)  0
  93 #endif
  94
  95 #if (defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ >= 403)) || \
  96     (__has_builtin(__builtin_bswap64) && __has_builtin(__builtin_bswap32))
  97 #  if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
  98 #    define cbor_ntohll     __builtin_bswap64
  99 #    define cbor_htonll     __builtin_bswap64
 100 #    define cbor_ntohl      __builtin_bswap32
 101 #    define cbor_htonl      __builtin_bswap32
 102 #    ifdef __INTEL_COMPILER
 103 #      define cbor_ntohs    _bswap16
 104 #      define cbor_htons    _bswap16
 105 #    elif (__GNUC__ * 100 + __GNUC_MINOR__ >= 608) || __has_builtin(__builtin_bswap16)
 106 #      define cbor_ntohs    __builtin_bswap16
 107 #      define cbor_htons    __builtin_bswap16
 108 #    else
 109 #      define cbor_ntohs(x) (((uint16_t)(x) >> 8) | ((uint16_t)(x) << 8))
 110 #      define cbor_htons    cbor_ntohs
 111 #    endif
 112 #  else
 113 #    define cbor_ntohll
 114 #    define cbor_htonll
 115 #    define cbor_ntohl
 116 #    define cbor_htonl
 117 #    define cbor_ntohs
 118 #    define cbor_htons
 119 #  endif
 120 #elif defined(__sun)
 121 #  include <sys/byteorder.h>
 122 #elif defined(_MSC_VER)
 123 /* MSVC, which implies Windows, which implies little-endian and sizeof(long) == 4 */
 124 #  include <stdlib.h>
 125 #  define cbor_ntohll       _byteswap_uint64
 126 #  define cbor_htonll       _byteswap_uint64
 127 #  define cbor_ntohl        _byteswap_ulong
 128 #  define cbor_htonl        _byteswap_ulong
 129 #  define cbor_ntohs        _byteswap_ushort
 130 #  define cbor_htons        _byteswap_ushort
 131 #endif
 132 #ifndef cbor_ntohs
 133 #  include <arpa/inet.h>
 134 #  define cbor_ntohs        ntohs
 135 #  define cbor_htons        htons
 136 #endif
 137 #ifndef cbor_ntohl
 138 #  include <arpa/inet.h>
 139 #  define cbor_ntohl        ntohl
 140 #  define cbor_htonl        htonl
 141 #endif
 142 #ifndef cbor_ntohll
 143 #  define cbor_ntohll       ntohll
 144 #  define cbor_htonll       htonll
 145 /* ntohll isn't usually defined */
 146 #  ifndef ntohll
 147 #    if (defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__) || \
 148     (defined(__BYTE_ORDER) && defined(__BIG_ENDIAN) && __BYTE_ORDER == __BIG_ENDIAN) || \
 149     (defined(BYTE_ORDER) && defined(BIG_ENDIAN) && BYTE_ORDER == BIG_ENDIAN) || \
 150     (defined(_BIG_ENDIAN) && !defined(_LITTLE_ENDIAN)) || (defined(__BIG_ENDIAN__) && !defined(__LITTLE_ENDIAN__)) || \
 151     defined(__ARMEB__) || defined(__MIPSEB__) || defined(__s390__) || defined(__sparc__)
 152 #      define ntohll
 153 #      define htonll
 154 #    elif (defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) || \
 155     (defined(__BYTE_ORDER) && defined(__LITTLE_ENDIAN) && __BYTE_ORDER == __LITTLE_ENDIAN) || \
 156     (defined(BYTE_ORDER) && defined(LITTLE_ENDIAN) && BYTE_ORDER == LITTLE_ENDIAN) || \
 157     defined(_LITTLE_ENDIAN) || defined(__LITTLE_ENDIAN__) || defined(__ARMEL__) || defined(__MIPSEL__) || \
 158     defined(__i386) || defined(__i386__) || defined(__x86_64) || defined(__x86_64__) || defined(__amd64)
 159 #      define ntohll(x)       ((ntohl((uint32_t)(x)) * UINT64_C(0x100000000)) + (ntohl((x) >> 32)))
 160 #      define htonll          ntohll
 161 #    else
 162 #      error "Unable to determine byte order!"
 163 #    endif
 164 #  endif
 165 #endif
 166
 167
 168 #ifdef __cplusplus
 169 #  define CONST_CAST(t, v)  const_cast<t>(v)
 170 #else
 171 /* C-style const_cast without triggering a warning with -Wcast-qual */
 172 #  define CONST_CAST(t, v)  (t)(uintptr_t)(v)
 173 #endif
 174
 175 #ifdef __GNUC__
 176 #ifndef likely
 177 #  define likely(x)     __builtin_expect(!!(x), 1)
 178 #endif
 179 #ifndef unlikely
 180 #  define unlikely(x)   __builtin_expect(!!(x), 0)
 181 #endif
 182 #  define unreachable() __builtin_unreachable()
 183 #elif defined(_MSC_VER)
 184 #  define likely(x)     (x)
 185 #  define unlikely(x)   (x)
 186 #  define unreachable() __assume(0)
 187 #else
 188 #  define likely(x)     (x)
 189 #  define unlikely(x)   (x)
 190 #  define unreachable() do {} while (0)
 191 #endif
 192
 193 static inline bool add_check_overflow(size_t v1, size_t v2, size_t *r)
 194 {
 195 #if ((defined(__GNUC__) && (__GNUC__ >= 5)) && !defined(__INTEL_COMPILER)) || __has_builtin(__builtin_add_overflow)
 196     return __builtin_add_overflow(v1, v2, r);
 197 #else
 198     /* unsigned additions are well-defined */
 199     *r = v1 + v2;
 200     return v1 > v1 + v2;
 201 #endif
 202 }
 203
 204 #endif /* COMPILERSUPPORT_H */
 205