include/openssl/macros.h

   1 /*
   2  * Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <openssl/opensslconf.h>
  11 #include <openssl/opensslv.h>
  12
  13 #ifndef OPENSSL_MACROS_H
  14 # define OPENSSL_MACROS_H
  15
  16 /* Helper macros for CPP string composition */
  17 # define OPENSSL_MSTR_HELPER(x) #x
  18 # define OPENSSL_MSTR(x) OPENSSL_MSTR_HELPER(x)
  19
  20 /*
  21  * Sometimes OPENSSSL_NO_xxx ends up with an empty file and some compilers
  22  * don't like that.  This will hopefully silence them.
  23  */
  24 # define NON_EMPTY_TRANSLATION_UNIT static void *dummy = &dummy;
  25
  26 /*
  27  * Generic deprecation macro
  28  */
  29 # ifndef DECLARE_DEPRECATED
  30 #  define DECLARE_DEPRECATED(f)   f;
  31 #  ifdef __GNUC__
  32 #   if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 0)
  33 #    undef DECLARE_DEPRECATED
  34 #    define DECLARE_DEPRECATED(f)    f __attribute__ ((deprecated));
  35 #   endif
  36 #  elif defined(__SUNPRO_C)
  37 #   if (__SUNPRO_C >= 0x5130)
  38 #    undef DECLARE_DEPRECATED
  39 #    define DECLARE_DEPRECATED(f)    f __attribute__ ((deprecated));
  40 #   endif
  41 #  endif
  42 # endif
  43
  44 /*
  45  * Applications should use -DOPENSSL_API_COMPAT=<version> to suppress the
  46  * declarations of functions deprecated in or before <version>.  If this is
  47  * undefined, the value of the macro OPENSSL_CONFIGURED_API (defined in
  48  * <openssl/opensslconf.h>) is the default.
  49  *
  50  * For any version number up until version 1.1.x, <version> is expected to be
  51  * the calculated version number 0xMNNFFPPSL.
  52  * For version numbers 3.0 and on, <version> is expected to be a computation
  53  * of the major and minor numbers in decimal using this formula:
  54  *
  55  *     MAJOR * 10000 + MINOR * 100
  56  *
  57  * So version 3.0 becomes 30000, version 3.2 becomes 30200, etc.
  58  */
  59
  60 /*
  61  * We use the OPENSSL_API_COMPAT value to define API level macros.  These
  62  * macros are used to enable or disable features at that API version boundary.
  63  */
  64
  65 # ifdef OPENSSL_API_LEVEL
  66 #  error "OPENSSL_API_LEVEL must not be defined by application"
  67 # endif
  68
  69 /*
  70  * We figure out what API level was intended by simple numeric comparison.
  71  * The lowest old style number we recognise is 0x00908000L, so we take some
  72  * safety margin and assume that anything below 0x00900000L is a new style
  73  * number.  This allows new versions up to and including v943.71.83.
  74  */
  75 # ifdef OPENSSL_API_COMPAT
  76 #  if OPENSSL_API_COMPAT < 0x900000L
  77 #   define OPENSSL_API_LEVEL (OPENSSL_API_COMPAT)
  78 #  else
  79 #   define OPENSSL_API_LEVEL                            \
  80            (((OPENSSL_API_COMPAT >> 28) & 0xF) * 10000  \
  81             + ((OPENSSL_API_COMPAT >> 20) & 0xFF) * 100 \
  82             + ((OPENSSL_API_COMPAT >> 12) & 0xFF))
  83 #  endif
  84 # endif
  85
  86 /*
  87  * If OPENSSL_API_COMPAT wasn't given, we use default numbers to set
  88  * the API compatibility level.
  89  */
  90 # ifndef OPENSSL_API_LEVEL
  91 #  if OPENSSL_CONFIGURED_API > 0
  92 #   define OPENSSL_API_LEVEL (OPENSSL_CONFIGURED_API)
  93 #  else
  94 #   define OPENSSL_API_LEVEL \
  95            (OPENSSL_VERSION_MAJOR * 10000 + OPENSSL_VERSION_MINOR * 100)
  96 #  endif
  97 # endif
  98
  99 # if OPENSSL_API_LEVEL > OPENSSL_CONFIGURED_API
 100 #  error "The requested API level higher than the configured API compatibility level"
 101 # endif
 102
 103 /*
 104  * Check of sane values.
 105  */
 106 /* Can't go higher than the current version. */
 107 # if OPENSSL_API_LEVEL > (OPENSSL_VERSION_MAJOR * 10000 + OPENSSL_VERSION_MINOR * 100)
 108 #  error "OPENSSL_API_COMPAT expresses an impossible API compatibility level"
 109 # endif
 110 /* OpenSSL will have no version 2.y.z */
 111 # if OPENSSL_API_LEVEL < 30000 && OPENSSL_API_LEVEL >= 20000
 112 #  error "OPENSSL_API_COMPAT expresses an impossible API compatibility level"
 113 # endif
 114 /* Below 0.9.8 is unacceptably low */
 115 # if OPENSSL_API_LEVEL < 908
 116 #  error "OPENSSL_API_COMPAT expresses an impossible API compatibility level"
 117 # endif
 118
 119 /*
 120  * Define macros for deprecation purposes.  We always define the macros
 121  * DEPERECATEDIN_{major}_{minor}() for all OpenSSL versions we care for,
 122  * and OPENSSL_NO_DEPRECATED_{major}_{minor} to be used to check if
 123  * removal of deprecated functions applies on that particular version.
 124  */
 125
 126 # undef OPENSSL_NO_DEPRECATED_3_0
 127 # undef OPENSSL_NO_DEPRECATED_1_1_1
 128 # undef OPENSSL_NO_DEPRECATED_1_1_0
 129 # undef OPENSSL_NO_DEPRECATED_1_0_2
 130 # undef OPENSSL_NO_DEPRECATED_1_0_1
 131 # undef OPENSSL_NO_DEPRECATED_1_0_0
 132 # undef OPENSSL_NO_DEPRECATED_0_9_8
 133
 134 # if OPENSSL_API_LEVEL >= 30000
 135 #  ifndef OPENSSL_NO_DEPRECATED
 136 #   define DEPRECATEDIN_3_0(f)       DECLARE_DEPRECATED(f)
 137 #  else
 138 #   define DEPRECATEDIN_3_0(f)
 139 #   define OPENSSL_NO_DEPRECATED_3_0
 140 #  endif
 141 # else
 142 #  define DEPRECATEDIN_3_0(f)        f;
 143 # endif
 144 # if OPENSSL_API_LEVEL >= 10101
 145 #  ifndef OPENSSL_NO_DEPRECATED
 146 #   define DEPRECATEDIN_1_1_1(f)     DECLARE_DEPRECATED(f)
 147 #  else
 148 #   define DEPRECATEDIN_1_1_1(f)
 149 #   define OPENSSL_NO_DEPRECATED_1_1_1
 150 #  endif
 151 # else
 152 #  define DEPRECATEDIN_1_1_1(f)      f;
 153 # endif
 154 # if OPENSSL_API_LEVEL >= 10100
 155 #  ifndef OPENSSL_NO_DEPRECATED
 156 #   define DEPRECATEDIN_1_1_0(f)     DECLARE_DEPRECATED(f)
 157 #  else
 158 #   define DEPRECATEDIN_1_1_0(f)
 159 #   define OPENSSL_NO_DEPRECATED_1_1_0
 160 #  endif
 161 # else
 162 #  define DEPRECATEDIN_1_1_0(f)      f;
 163 # endif
 164 # if OPENSSL_API_LEVEL >= 10002
 165 #  ifndef OPENSSL_NO_DEPRECATED
 166 #   define DEPRECATEDIN_1_0_2(f)     DECLARE_DEPRECATED(f)
 167 #  else
 168 #   define DEPRECATEDIN_1_0_2(f)
 169 #   define OPENSSL_NO_DEPRECATED_1_0_2
 170 #  endif
 171 # else
 172 #  define DEPRECATEDIN_1_0_2(f)      f;
 173 # endif
 174 # if OPENSSL_API_LEVEL >= 10001
 175 #  ifndef OPENSSL_NO_DEPRECATED
 176 #   define DEPRECATEDIN_1_0_1(f)     DECLARE_DEPRECATED(f)
 177 #  else
 178 #   define DEPRECATEDIN_1_0_1(f)
 179 #   define OPENSSL_NO_DEPRECATED_1_0_1
 180 #  endif
 181 # else
 182 #  define DEPRECATEDIN_1_0_1(f)      f;
 183 # endif
 184 # if OPENSSL_API_LEVEL >= 10000
 185 #  ifndef OPENSSL_NO_DEPRECATED
 186 #   define DEPRECATEDIN_1_0_0(f)     DECLARE_DEPRECATED(f)
 187 #  else
 188 #   define DEPRECATEDIN_1_0_0(f)
 189 #   define OPENSSL_NO_DEPRECATED_1_0_0
 190 #  endif
 191 # else
 192 #  define DEPRECATEDIN_1_0_0(f)      f;
 193 # endif
 194 # if OPENSSL_API_LEVEL >= 908
 195 #  ifndef OPENSSL_NO_DEPRECATED
 196 #   define DEPRECATEDIN_0_9_8(f)     DECLARE_DEPRECATED(f)
 197 #  else
 198 #   define DEPRECATEDIN_0_9_8(f)
 199 #   define OPENSSL_NO_DEPRECATED_0_9_8
 200 #  endif
 201 # else
 202 #  define DEPRECATEDIN_0_9_8(f)      f;
 203 # endif
 204
 205 /*
 206  * Make our own variants of __FILE__ and __LINE__, depending on configuration
 207  */
 208
 209 # ifndef OPENSSL_FILE
 210 #  ifdef OPENSSL_NO_FILENAMES
 211 #   define OPENSSL_FILE ""
 212 #   define OPENSSL_LINE 0
 213 #  else
 214 #   define OPENSSL_FILE __FILE__
 215 #   define OPENSSL_LINE __LINE__
 216 #  endif
 217 # endif
 218
 219 /*
 220  * __func__ was standardized in C99, so for any compiler that claims
 221  * to implement that language level or newer, we assume we can safely
 222  * use that symbol.
 223  *
 224  * GNU C also provides __FUNCTION__ since version 2, which predates
 225  * C99.  We can, however, only use this if __STDC_VERSION__ exists,
 226  * as it's otherwise not allowed according to ISO C standards (C90).
 227  * (compiling with GNU C's -pedantic tells us so)
 228  *
 229  * If none of the above applies, we check if the compiler is MSVC,
 230  * and use __FUNCTION__ if that's the case.
 231  */
 232 # ifndef OPENSSL_FUNC
 233 #  if defined(__STDC_VERSION__)
 234 #   if __STDC_VERSION__ >= 199901L
 235 #    define OPENSSL_FUNC __func__
 236 #   elif defined(__GNUC__) && __GNUC__ >= 2
 237 #    define OPENSSL_FUNC __FUNCTION__
 238 #   endif
 239 #  elif defined(_MSC_VER)
 240 #    define OPENSSL_FUNC __FUNCTION__
 241 #  endif
 242 /*
 243  * If all these possibilities are exhausted, we give up and use a
 244  * static string.
 245  */
 246 #  ifndef OPENSSL_FUNC
 247 #   define OPENSSL_FUNC "(unknown function)"
 248 #  endif
 249 # endif
 250
 251 #endif  /* OPENSSL_MACROS_H */