Mercurial > hg > CbC > CbC_gcc
annotate include/ansidecl.h @ 158:494b0b89df80 default tip
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| author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
|---|---|
| date | Mon, 25 May 2020 18:13:55 +0900 |
| parents | 1830386684a0 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* ANSI and traditional C compatability macros |
| 145 | 2 Copyright (C) 1991-2020 Free Software Foundation, Inc. |
| 0 | 3 This file is part of the GNU C Library. |
| 4 | |
| 5 This program is free software; you can redistribute it and/or modify | |
| 6 it under the terms of the GNU General Public License as published by | |
| 7 the Free Software Foundation; either version 2 of the License, or | |
| 8 (at your option) any later version. | |
| 9 | |
| 10 This program is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 13 GNU General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU General Public License | |
| 16 along with this program; if not, write to the Free Software | |
| 17 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ | |
| 18 | |
| 19 /* ANSI and traditional C compatibility macros | |
| 20 | |
| 21 ANSI C is assumed if __STDC__ is #defined. | |
| 22 | |
| 23 Macro ANSI C definition Traditional C definition | |
| 24 ----- ---- - ---------- ----------- - ---------- | |
| 25 PTR `void *' `char *' | |
| 26 const not defined `' | |
| 27 volatile not defined `' | |
| 28 signed not defined `' | |
| 29 | |
| 30 For ease of writing code which uses GCC extensions but needs to be | |
| 31 portable to other compilers, we provide the GCC_VERSION macro that | |
| 32 simplifies testing __GNUC__ and __GNUC_MINOR__ together, and various | |
| 33 wrappers around __attribute__. Also, __extension__ will be #defined | |
| 111 | 34 to nothing if it doesn't work. See below. */ |
| 0 | 35 |
| 36 #ifndef _ANSIDECL_H | |
| 37 #define _ANSIDECL_H 1 | |
| 38 | |
|
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39 #ifdef __cplusplus |
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40 extern "C" { |
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41 #endif |
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42 |
| 0 | 43 /* Every source file includes this file, |
| 44 so they will all get the switch for lint. */ | |
| 45 /* LINTLIBRARY */ | |
| 46 | |
| 47 /* Using MACRO(x,y) in cpp #if conditionals does not work with some | |
| 48 older preprocessors. Thus we can't define something like this: | |
| 49 | |
| 50 #define HAVE_GCC_VERSION(MAJOR, MINOR) \ | |
| 51 (__GNUC__ > (MAJOR) || (__GNUC__ == (MAJOR) && __GNUC_MINOR__ >= (MINOR))) | |
| 52 | |
| 53 and then test "#if HAVE_GCC_VERSION(2,7)". | |
| 54 | |
| 55 So instead we use the macro below and test it against specific values. */ | |
| 56 | |
| 57 /* This macro simplifies testing whether we are using gcc, and if it | |
| 58 is of a particular minimum version. (Both major & minor numbers are | |
| 59 significant.) This macro will evaluate to 0 if we are not using | |
| 60 gcc at all. */ | |
| 61 #ifndef GCC_VERSION | |
| 62 #define GCC_VERSION (__GNUC__ * 1000 + __GNUC_MINOR__) | |
| 63 #endif /* GCC_VERSION */ | |
| 64 | |
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65 #if defined (__STDC__) || defined(__cplusplus) || defined (_AIX) || (defined (__mips) && defined (_SYSTYPE_SVR4)) || defined(_WIN32) |
| 0 | 66 /* All known AIX compilers implement these things (but don't always |
| 67 define __STDC__). The RISC/OS MIPS compiler defines these things | |
| 68 in SVR4 mode, but does not define __STDC__. */ | |
| 69 /* eraxxon@alumni.rice.edu: The Compaq C++ compiler, unlike many other | |
| 70 C++ compilers, does not define __STDC__, though it acts as if this | |
| 71 was so. (Verified versions: 5.7, 6.2, 6.3, 6.5) */ | |
| 72 | |
| 73 #define PTR void * | |
| 74 | |
| 75 #undef const | |
| 76 #undef volatile | |
| 77 #undef signed | |
| 78 | |
| 79 /* inline requires special treatment; it's in C99, and GCC >=2.7 supports | |
| 80 it too, but it's not in C89. */ | |
| 81 #undef inline | |
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82 #if __STDC_VERSION__ >= 199901L || defined(__cplusplus) || (defined(__SUNPRO_C) && defined(__C99FEATURES__)) |
| 0 | 83 /* it's a keyword */ |
| 84 #else | |
| 85 # if GCC_VERSION >= 2007 | |
| 86 # define inline __inline__ /* __inline__ prevents -pedantic warnings */ | |
| 87 # else | |
| 88 # define inline /* nothing */ | |
| 89 # endif | |
| 90 #endif | |
| 91 | |
| 92 #else /* Not ANSI C. */ | |
| 93 | |
| 94 #define PTR char * | |
| 95 | |
| 96 /* some systems define these in header files for non-ansi mode */ | |
| 97 #undef const | |
| 98 #undef volatile | |
| 99 #undef signed | |
| 100 #undef inline | |
| 101 #define const | |
| 102 #define volatile | |
| 103 #define signed | |
| 104 #define inline | |
| 105 | |
| 106 #endif /* ANSI C. */ | |
| 107 | |
| 108 /* Define macros for some gcc attributes. This permits us to use the | |
| 109 macros freely, and know that they will come into play for the | |
| 110 version of gcc in which they are supported. */ | |
| 111 | |
| 112 #if (GCC_VERSION < 2007) | |
| 113 # define __attribute__(x) | |
| 114 #endif | |
| 115 | |
| 116 /* Attribute __malloc__ on functions was valid as of gcc 2.96. */ | |
| 117 #ifndef ATTRIBUTE_MALLOC | |
| 118 # if (GCC_VERSION >= 2096) | |
| 119 # define ATTRIBUTE_MALLOC __attribute__ ((__malloc__)) | |
| 120 # else | |
| 121 # define ATTRIBUTE_MALLOC | |
| 122 # endif /* GNUC >= 2.96 */ | |
| 123 #endif /* ATTRIBUTE_MALLOC */ | |
| 124 | |
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125 /* Attributes on labels were valid as of gcc 2.93 and g++ 4.5. For |
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126 g++ an attribute on a label must be followed by a semicolon. */ |
| 0 | 127 #ifndef ATTRIBUTE_UNUSED_LABEL |
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128 # ifndef __cplusplus |
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129 # if GCC_VERSION >= 2093 |
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130 # define ATTRIBUTE_UNUSED_LABEL ATTRIBUTE_UNUSED |
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131 # else |
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132 # define ATTRIBUTE_UNUSED_LABEL |
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133 # endif |
| 0 | 134 # else |
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135 # if GCC_VERSION >= 4005 |
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136 # define ATTRIBUTE_UNUSED_LABEL ATTRIBUTE_UNUSED ; |
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137 # else |
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138 # define ATTRIBUTE_UNUSED_LABEL |
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139 # endif |
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140 # endif |
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141 #endif |
| 0 | 142 |
| 111 | 143 /* Similarly to ARG_UNUSED below. Prior to GCC 3.4, the C++ frontend |
| 144 couldn't parse attributes placed after the identifier name, and now | |
| 145 the entire compiler is built with C++. */ | |
| 0 | 146 #ifndef ATTRIBUTE_UNUSED |
| 111 | 147 #if GCC_VERSION >= 3004 |
| 148 # define ATTRIBUTE_UNUSED __attribute__ ((__unused__)) | |
| 149 #else | |
| 150 #define ATTRIBUTE_UNUSED | |
| 151 #endif | |
| 0 | 152 #endif /* ATTRIBUTE_UNUSED */ |
| 153 | |
| 154 /* Before GCC 3.4, the C++ frontend couldn't parse attributes placed after the | |
| 155 identifier name. */ | |
| 156 #if ! defined(__cplusplus) || (GCC_VERSION >= 3004) | |
| 157 # define ARG_UNUSED(NAME) NAME ATTRIBUTE_UNUSED | |
| 158 #else /* !__cplusplus || GNUC >= 3.4 */ | |
| 159 # define ARG_UNUSED(NAME) NAME | |
| 160 #endif /* !__cplusplus || GNUC >= 3.4 */ | |
| 161 | |
| 162 #ifndef ATTRIBUTE_NORETURN | |
| 163 #define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__)) | |
| 164 #endif /* ATTRIBUTE_NORETURN */ | |
| 165 | |
| 166 /* Attribute `nonnull' was valid as of gcc 3.3. */ | |
| 167 #ifndef ATTRIBUTE_NONNULL | |
| 168 # if (GCC_VERSION >= 3003) | |
| 169 # define ATTRIBUTE_NONNULL(m) __attribute__ ((__nonnull__ (m))) | |
| 170 # else | |
| 171 # define ATTRIBUTE_NONNULL(m) | |
| 172 # endif /* GNUC >= 3.3 */ | |
| 173 #endif /* ATTRIBUTE_NONNULL */ | |
| 174 | |
| 111 | 175 /* Attribute `returns_nonnull' was valid as of gcc 4.9. */ |
| 176 #ifndef ATTRIBUTE_RETURNS_NONNULL | |
| 177 # if (GCC_VERSION >= 4009) | |
| 178 # define ATTRIBUTE_RETURNS_NONNULL __attribute__ ((__returns_nonnull__)) | |
| 179 # else | |
| 180 # define ATTRIBUTE_RETURNS_NONNULL | |
| 181 # endif /* GNUC >= 4.9 */ | |
| 182 #endif /* ATTRIBUTE_RETURNS_NONNULL */ | |
| 183 | |
| 0 | 184 /* Attribute `pure' was valid as of gcc 3.0. */ |
| 185 #ifndef ATTRIBUTE_PURE | |
| 186 # if (GCC_VERSION >= 3000) | |
| 187 # define ATTRIBUTE_PURE __attribute__ ((__pure__)) | |
| 188 # else | |
| 189 # define ATTRIBUTE_PURE | |
| 190 # endif /* GNUC >= 3.0 */ | |
| 191 #endif /* ATTRIBUTE_PURE */ | |
| 192 | |
| 193 /* Use ATTRIBUTE_PRINTF when the format specifier must not be NULL. | |
| 194 This was the case for the `printf' format attribute by itself | |
| 195 before GCC 3.3, but as of 3.3 we need to add the `nonnull' | |
| 196 attribute to retain this behavior. */ | |
| 197 #ifndef ATTRIBUTE_PRINTF | |
| 198 #define ATTRIBUTE_PRINTF(m, n) __attribute__ ((__format__ (__printf__, m, n))) ATTRIBUTE_NONNULL(m) | |
| 199 #define ATTRIBUTE_PRINTF_1 ATTRIBUTE_PRINTF(1, 2) | |
| 200 #define ATTRIBUTE_PRINTF_2 ATTRIBUTE_PRINTF(2, 3) | |
| 201 #define ATTRIBUTE_PRINTF_3 ATTRIBUTE_PRINTF(3, 4) | |
| 202 #define ATTRIBUTE_PRINTF_4 ATTRIBUTE_PRINTF(4, 5) | |
| 203 #define ATTRIBUTE_PRINTF_5 ATTRIBUTE_PRINTF(5, 6) | |
| 204 #endif /* ATTRIBUTE_PRINTF */ | |
| 205 | |
| 206 /* Use ATTRIBUTE_FPTR_PRINTF when the format attribute is to be set on | |
| 207 a function pointer. Format attributes were allowed on function | |
| 208 pointers as of gcc 3.1. */ | |
| 209 #ifndef ATTRIBUTE_FPTR_PRINTF | |
| 210 # if (GCC_VERSION >= 3001) | |
| 211 # define ATTRIBUTE_FPTR_PRINTF(m, n) ATTRIBUTE_PRINTF(m, n) | |
| 212 # else | |
| 213 # define ATTRIBUTE_FPTR_PRINTF(m, n) | |
| 214 # endif /* GNUC >= 3.1 */ | |
| 215 # define ATTRIBUTE_FPTR_PRINTF_1 ATTRIBUTE_FPTR_PRINTF(1, 2) | |
| 216 # define ATTRIBUTE_FPTR_PRINTF_2 ATTRIBUTE_FPTR_PRINTF(2, 3) | |
| 217 # define ATTRIBUTE_FPTR_PRINTF_3 ATTRIBUTE_FPTR_PRINTF(3, 4) | |
| 218 # define ATTRIBUTE_FPTR_PRINTF_4 ATTRIBUTE_FPTR_PRINTF(4, 5) | |
| 219 # define ATTRIBUTE_FPTR_PRINTF_5 ATTRIBUTE_FPTR_PRINTF(5, 6) | |
| 220 #endif /* ATTRIBUTE_FPTR_PRINTF */ | |
| 221 | |
| 222 /* Use ATTRIBUTE_NULL_PRINTF when the format specifier may be NULL. A | |
| 223 NULL format specifier was allowed as of gcc 3.3. */ | |
| 224 #ifndef ATTRIBUTE_NULL_PRINTF | |
| 225 # if (GCC_VERSION >= 3003) | |
| 226 # define ATTRIBUTE_NULL_PRINTF(m, n) __attribute__ ((__format__ (__printf__, m, n))) | |
| 227 # else | |
| 228 # define ATTRIBUTE_NULL_PRINTF(m, n) | |
| 229 # endif /* GNUC >= 3.3 */ | |
| 230 # define ATTRIBUTE_NULL_PRINTF_1 ATTRIBUTE_NULL_PRINTF(1, 2) | |
| 231 # define ATTRIBUTE_NULL_PRINTF_2 ATTRIBUTE_NULL_PRINTF(2, 3) | |
| 232 # define ATTRIBUTE_NULL_PRINTF_3 ATTRIBUTE_NULL_PRINTF(3, 4) | |
| 233 # define ATTRIBUTE_NULL_PRINTF_4 ATTRIBUTE_NULL_PRINTF(4, 5) | |
| 234 # define ATTRIBUTE_NULL_PRINTF_5 ATTRIBUTE_NULL_PRINTF(5, 6) | |
| 235 #endif /* ATTRIBUTE_NULL_PRINTF */ | |
| 236 | |
| 237 /* Attribute `sentinel' was valid as of gcc 3.5. */ | |
| 238 #ifndef ATTRIBUTE_SENTINEL | |
| 239 # if (GCC_VERSION >= 3005) | |
| 240 # define ATTRIBUTE_SENTINEL __attribute__ ((__sentinel__)) | |
| 241 # else | |
| 242 # define ATTRIBUTE_SENTINEL | |
| 243 # endif /* GNUC >= 3.5 */ | |
| 244 #endif /* ATTRIBUTE_SENTINEL */ | |
| 245 | |
| 246 | |
| 247 #ifndef ATTRIBUTE_ALIGNED_ALIGNOF | |
| 248 # if (GCC_VERSION >= 3000) | |
| 249 # define ATTRIBUTE_ALIGNED_ALIGNOF(m) __attribute__ ((__aligned__ (__alignof__ (m)))) | |
| 250 # else | |
| 251 # define ATTRIBUTE_ALIGNED_ALIGNOF(m) | |
| 252 # endif /* GNUC >= 3.0 */ | |
| 253 #endif /* ATTRIBUTE_ALIGNED_ALIGNOF */ | |
| 254 | |
| 111 | 255 /* Useful for structures whose layout must match some binary specification |
| 0 | 256 regardless of the alignment and padding qualities of the compiler. */ |
| 257 #ifndef ATTRIBUTE_PACKED | |
| 258 # define ATTRIBUTE_PACKED __attribute__ ((packed)) | |
| 259 #endif | |
| 260 | |
| 261 /* Attribute `hot' and `cold' was valid as of gcc 4.3. */ | |
| 262 #ifndef ATTRIBUTE_COLD | |
| 263 # if (GCC_VERSION >= 4003) | |
| 264 # define ATTRIBUTE_COLD __attribute__ ((__cold__)) | |
| 265 # else | |
| 266 # define ATTRIBUTE_COLD | |
| 267 # endif /* GNUC >= 4.3 */ | |
| 268 #endif /* ATTRIBUTE_COLD */ | |
| 269 #ifndef ATTRIBUTE_HOT | |
| 270 # if (GCC_VERSION >= 4003) | |
| 271 # define ATTRIBUTE_HOT __attribute__ ((__hot__)) | |
| 272 # else | |
| 273 # define ATTRIBUTE_HOT | |
| 274 # endif /* GNUC >= 4.3 */ | |
| 275 #endif /* ATTRIBUTE_HOT */ | |
| 276 | |
| 111 | 277 /* Attribute 'no_sanitize_undefined' was valid as of gcc 4.9. */ |
| 278 #ifndef ATTRIBUTE_NO_SANITIZE_UNDEFINED | |
| 279 # if (GCC_VERSION >= 4009) | |
| 280 # define ATTRIBUTE_NO_SANITIZE_UNDEFINED __attribute__ ((no_sanitize_undefined)) | |
| 281 # else | |
| 282 # define ATTRIBUTE_NO_SANITIZE_UNDEFINED | |
| 283 # endif /* GNUC >= 4.9 */ | |
| 284 #endif /* ATTRIBUTE_NO_SANITIZE_UNDEFINED */ | |
| 285 | |
| 131 | 286 /* Attribute 'nonstring' was valid as of gcc 8. */ |
| 287 #ifndef ATTRIBUTE_NONSTRING | |
| 288 # if GCC_VERSION >= 8000 | |
| 289 # define ATTRIBUTE_NONSTRING __attribute__ ((__nonstring__)) | |
| 290 # else | |
| 291 # define ATTRIBUTE_NONSTRING | |
| 292 # endif | |
| 293 #endif | |
| 294 | |
| 145 | 295 /* Attribute `alloc_size' was valid as of gcc 4.3. */ |
| 296 #ifndef ATTRIBUTE_RESULT_SIZE_1 | |
| 297 # if (GCC_VERSION >= 4003) | |
| 298 # define ATTRIBUTE_RESULT_SIZE_1 __attribute__ ((alloc_size (1))) | |
| 299 # else | |
| 300 # define ATTRIBUTE_RESULT_SIZE_1 | |
| 301 #endif | |
| 302 #endif | |
| 303 | |
| 304 #ifndef ATTRIBUTE_RESULT_SIZE_2 | |
| 305 # if (GCC_VERSION >= 4003) | |
| 306 # define ATTRIBUTE_RESULT_SIZE_2 __attribute__ ((alloc_size (2))) | |
| 307 # else | |
| 308 # define ATTRIBUTE_RESULT_SIZE_2 | |
| 309 #endif | |
| 310 #endif | |
| 311 | |
| 312 #ifndef ATTRIBUTE_RESULT_SIZE_1_2 | |
| 313 # if (GCC_VERSION >= 4003) | |
| 314 # define ATTRIBUTE_RESULT_SIZE_1_2 __attribute__ ((alloc_size (1, 2))) | |
| 315 # else | |
| 316 # define ATTRIBUTE_RESULT_SIZE_1_2 | |
| 317 #endif | |
| 318 #endif | |
| 319 | |
| 320 /* Attribute `warn_unused_result' was valid as of gcc 3.3. */ | |
| 321 #ifndef ATTRIBUTE_WARN_UNUSED_RESULT | |
| 322 # if GCC_VERSION >= 3003 | |
| 323 # define ATTRIBUTE_WARN_UNUSED_RESULT __attribute__ ((warn_unused_result)) | |
| 324 # else | |
| 325 # define ATTRIBUTE_WARN_UNUSED_RESULT | |
| 326 # endif | |
| 327 #endif | |
| 328 | |
| 0 | 329 /* We use __extension__ in some places to suppress -pedantic warnings |
| 330 about GCC extensions. This feature didn't work properly before | |
| 331 gcc 2.8. */ | |
| 332 #if GCC_VERSION < 2008 | |
| 333 #define __extension__ | |
| 334 #endif | |
| 335 | |
|
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336 /* This is used to declare a const variable which should be visible |
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337 outside of the current compilation unit. Use it as |
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338 EXPORTED_CONST int i = 1; |
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339 This is because the semantics of const are different in C and C++. |
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340 "extern const" is permitted in C but it looks strange, and gcc |
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341 warns about it when -Wc++-compat is not used. */ |
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342 #ifdef __cplusplus |
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343 #define EXPORTED_CONST extern const |
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344 #else |
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345 #define EXPORTED_CONST const |
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346 #endif |
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347 |
| 111 | 348 /* Be conservative and only use enum bitfields with C++ or GCC. |
| 349 FIXME: provide a complete autoconf test for buggy enum bitfields. */ | |
| 350 | |
| 351 #ifdef __cplusplus | |
| 352 #define ENUM_BITFIELD(TYPE) enum TYPE | |
| 353 #elif (GCC_VERSION > 2000) | |
| 354 #define ENUM_BITFIELD(TYPE) __extension__ enum TYPE | |
| 355 #else | |
| 356 #define ENUM_BITFIELD(TYPE) unsigned int | |
| 357 #endif | |
| 358 | |
| 359 #if __cpp_constexpr >= 200704 | |
| 360 #define CONSTEXPR constexpr | |
| 361 #else | |
| 362 #define CONSTEXPR | |
| 363 #endif | |
| 364 | |
| 365 /* C++11 adds the ability to add "override" after an implementation of a | |
| 366 virtual function in a subclass, to: | |
| 367 (A) document that this is an override of a virtual function | |
| 368 (B) allow the compiler to issue a warning if it isn't (e.g. a mismatch | |
| 369 of the type signature). | |
| 370 | |
| 371 Similarly, it allows us to add a "final" to indicate that no subclass | |
| 372 may subsequently override the vfunc. | |
| 373 | |
| 374 Provide OVERRIDE and FINAL as macros, allowing us to get these benefits | |
| 375 when compiling with C++11 support, but without requiring C++11. | |
| 376 | |
| 377 For gcc, use "-std=c++11" to enable C++11 support; gcc 6 onwards enables | |
| 378 this by default (actually GNU++14). */ | |
| 379 | |
| 380 #if defined __cplusplus | |
| 381 # if __cplusplus >= 201103 | |
| 382 /* C++11 claims to be available: use it. Final/override were only | |
| 383 implemented in 4.7, though. */ | |
| 384 # if GCC_VERSION < 4007 | |
| 385 # define OVERRIDE | |
| 386 # define FINAL | |
| 387 # else | |
| 388 # define OVERRIDE override | |
| 389 # define FINAL final | |
| 390 # endif | |
| 391 # elif GCC_VERSION >= 4007 | |
| 392 /* G++ 4.7 supports __final in C++98. */ | |
| 393 # define OVERRIDE | |
| 394 # define FINAL __final | |
| 395 # else | |
| 396 /* No C++11 support; leave the macros empty. */ | |
| 397 # define OVERRIDE | |
| 398 # define FINAL | |
| 399 # endif | |
| 400 #else | |
| 401 /* No C++11 support; leave the macros empty. */ | |
| 402 # define OVERRIDE | |
| 403 # define FINAL | |
| 404 #endif | |
| 405 | |
| 406 /* A macro to disable the copy constructor and assignment operator. | |
| 407 When building with C++11 and above, the methods are explicitly | |
| 408 deleted, causing a compile-time error if something tries to copy. | |
| 409 For C++03, this just declares the methods, causing a link-time | |
| 410 error if the methods end up called (assuming you don't | |
| 411 define them). For C++03, for best results, place the macro | |
| 412 under the private: access specifier, like this, | |
| 413 | |
| 414 class name_lookup | |
| 415 { | |
| 416 private: | |
| 417 DISABLE_COPY_AND_ASSIGN (name_lookup); | |
| 418 }; | |
| 419 | |
| 420 so that most attempts at copy are caught at compile-time. */ | |
| 421 | |
| 422 #if __cplusplus >= 201103 | |
| 423 #define DISABLE_COPY_AND_ASSIGN(TYPE) \ | |
| 424 TYPE (const TYPE&) = delete; \ | |
| 425 void operator= (const TYPE &) = delete | |
| 426 #else | |
| 427 #define DISABLE_COPY_AND_ASSIGN(TYPE) \ | |
| 428 TYPE (const TYPE&); \ | |
| 429 void operator= (const TYPE &) | |
| 430 #endif /* __cplusplus >= 201103 */ | |
| 431 | |
|
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432 #ifdef __cplusplus |
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433 } |
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434 #endif |
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435 |
| 0 | 436 #endif /* ansidecl.h */ |