| 1 | /* $NetBSD: cdefs.h,v 1.128 2015/11/19 17:04:01 christos Exp $ */ |
| 2 | |
| 3 | /* * Copyright (c) 1991, 1993 |
| 4 | * The Regents of the University of California. All rights reserved. |
| 5 | * |
| 6 | * This code is derived from software contributed to Berkeley by |
| 7 | * Berkeley Software Design, Inc. |
| 8 | * |
| 9 | * Redistribution and use in source and binary forms, with or without |
| 10 | * modification, are permitted provided that the following conditions |
| 11 | * are met: |
| 12 | * 1. Redistributions of source code must retain the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer. |
| 14 | * 2. Redistributions in binary form must reproduce the above copyright |
| 15 | * notice, this list of conditions and the following disclaimer in the |
| 16 | * documentation and/or other materials provided with the distribution. |
| 17 | * 3. Neither the name of the University nor the names of its contributors |
| 18 | * may be used to endorse or promote products derived from this software |
| 19 | * without specific prior written permission. |
| 20 | * |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 31 | * SUCH DAMAGE. |
| 32 | * |
| 33 | * @(#)cdefs.h 8.8 (Berkeley) 1/9/95 |
| 34 | */ |
| 35 | |
| 36 | #ifndef _SYS_CDEFS_H_ |
| 37 | #define _SYS_CDEFS_H_ |
| 38 | |
| 39 | #ifdef _KERNEL_OPT |
| 40 | #include "opt_diagnostic.h" |
| 41 | #endif |
| 42 | |
| 43 | /* |
| 44 | * Macro to test if we're using a GNU C compiler of a specific vintage |
| 45 | * or later, for e.g. features that appeared in a particular version |
| 46 | * of GNU C. Usage: |
| 47 | * |
| 48 | * #if __GNUC_PREREQ__(major, minor) |
| 49 | * ...cool feature... |
| 50 | * #else |
| 51 | * ...delete feature... |
| 52 | * #endif |
| 53 | */ |
| 54 | #ifdef __GNUC__ |
| 55 | #define __GNUC_PREREQ__(x, y) \ |
| 56 | ((__GNUC__ == (x) && __GNUC_MINOR__ >= (y)) || \ |
| 57 | (__GNUC__ > (x))) |
| 58 | #else |
| 59 | #define __GNUC_PREREQ__(x, y) 0 |
| 60 | #endif |
| 61 | |
| 62 | #include <machine/cdefs.h> |
| 63 | #ifdef __ELF__ |
| 64 | #include <sys/cdefs_elf.h> |
| 65 | #else |
| 66 | #include <sys/cdefs_aout.h> |
| 67 | #endif |
| 68 | |
| 69 | #ifdef __GNUC__ |
| 70 | #define __strict_weak_alias(alias,sym) \ |
| 71 | __unused static __typeof__(alias) *__weak_alias_##alias = &sym; \ |
| 72 | __weak_alias(alias,sym) |
| 73 | #else |
| 74 | #define __strict_weak_alias(alias,sym) __weak_alias(alias,sym) |
| 75 | #endif |
| 76 | |
| 77 | /* |
| 78 | * Optional marker for size-optimised MD calling convention. |
| 79 | */ |
| 80 | #ifndef __compactcall |
| 81 | #define __compactcall |
| 82 | #endif |
| 83 | |
| 84 | /* |
| 85 | * The __CONCAT macro is used to concatenate parts of symbol names, e.g. |
| 86 | * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo. |
| 87 | * The __CONCAT macro is a bit tricky -- make sure you don't put spaces |
| 88 | * in between its arguments. __CONCAT can also concatenate double-quoted |
| 89 | * strings produced by the __STRING macro, but this only works with ANSI C. |
| 90 | */ |
| 91 | |
| 92 | #define ___STRING(x) __STRING(x) |
| 93 | #define ___CONCAT(x,y) __CONCAT(x,y) |
| 94 | |
| 95 | #if __STDC__ || defined(__cplusplus) |
| 96 | #define __P(protos) protos /* full-blown ANSI C */ |
| 97 | #define __CONCAT(x,y) x ## y |
| 98 | #define __STRING(x) #x |
| 99 | |
| 100 | #define __const const /* define reserved names to standard */ |
| 101 | #define __signed signed |
| 102 | #define __volatile volatile |
| 103 | #if defined(__cplusplus) || defined(__PCC__) |
| 104 | #define __inline inline /* convert to C++/C99 keyword */ |
| 105 | #else |
| 106 | #if !defined(__GNUC__) && !defined(__lint__) |
| 107 | #define __inline /* delete GCC keyword */ |
| 108 | #endif /* !__GNUC__ && !__lint__ */ |
| 109 | #endif /* !__cplusplus */ |
| 110 | |
| 111 | #else /* !(__STDC__ || __cplusplus) */ |
| 112 | #define __P(protos) () /* traditional C preprocessor */ |
| 113 | #define __CONCAT(x,y) x/**/y |
| 114 | #define __STRING(x) "x" |
| 115 | |
| 116 | #ifndef __GNUC__ |
| 117 | #define __const /* delete pseudo-ANSI C keywords */ |
| 118 | #define __inline |
| 119 | #define __signed |
| 120 | #define __volatile |
| 121 | #endif /* !__GNUC__ */ |
| 122 | |
| 123 | /* |
| 124 | * In non-ANSI C environments, new programs will want ANSI-only C keywords |
| 125 | * deleted from the program and old programs will want them left alone. |
| 126 | * Programs using the ANSI C keywords const, inline etc. as normal |
| 127 | * identifiers should define -DNO_ANSI_KEYWORDS. |
| 128 | */ |
| 129 | #ifndef NO_ANSI_KEYWORDS |
| 130 | #define const __const /* convert ANSI C keywords */ |
| 131 | #define inline __inline |
| 132 | #define signed __signed |
| 133 | #define volatile __volatile |
| 134 | #endif /* !NO_ANSI_KEYWORDS */ |
| 135 | #endif /* !(__STDC__ || __cplusplus) */ |
| 136 | |
| 137 | /* |
| 138 | * Used for internal auditing of the NetBSD source tree. |
| 139 | */ |
| 140 | #ifdef __AUDIT__ |
| 141 | #define __aconst __const |
| 142 | #else |
| 143 | #define __aconst |
| 144 | #endif |
| 145 | |
| 146 | /* |
| 147 | * Compile Time Assertion. |
| 148 | */ |
| 149 | #ifdef __COUNTER__ |
| 150 | #define __CTASSERT(x) __CTASSERT0(x, __ctassert, __COUNTER__) |
| 151 | #else |
| 152 | #define __CTASSERT(x) __CTASSERT99(x, __INCLUDE_LEVEL__, __LINE__) |
| 153 | #define __CTASSERT99(x, a, b) __CTASSERT0(x, __CONCAT(__ctassert,a), \ |
| 154 | __CONCAT(_,b)) |
| 155 | #endif |
| 156 | #define __CTASSERT0(x, y, z) __CTASSERT1(x, y, z) |
| 157 | #define __CTASSERT1(x, y, z) typedef char y ## z[/*CONSTCOND*/(x) ? 1 : -1] __unused |
| 158 | |
| 159 | /* |
| 160 | * The following macro is used to remove const cast-away warnings |
| 161 | * from gcc -Wcast-qual; it should be used with caution because it |
| 162 | * can hide valid errors; in particular most valid uses are in |
| 163 | * situations where the API requires it, not to cast away string |
| 164 | * constants. We don't use *intptr_t on purpose here and we are |
| 165 | * explicit about unsigned long so that we don't have additional |
| 166 | * dependencies. |
| 167 | */ |
| 168 | #define __UNCONST(a) ((void *)(unsigned long)(const void *)(a)) |
| 169 | |
| 170 | /* |
| 171 | * The following macro is used to remove the volatile cast-away warnings |
| 172 | * from gcc -Wcast-qual; as above it should be used with caution |
| 173 | * because it can hide valid errors or warnings. Valid uses include |
| 174 | * making it possible to pass a volatile pointer to memset(). |
| 175 | * For the same reasons as above, we use unsigned long and not intptr_t. |
| 176 | */ |
| 177 | #define __UNVOLATILE(a) ((void *)(unsigned long)(volatile void *)(a)) |
| 178 | |
| 179 | /* |
| 180 | * GCC2 provides __extension__ to suppress warnings for various GNU C |
| 181 | * language extensions under "-ansi -pedantic". |
| 182 | */ |
| 183 | #if !__GNUC_PREREQ__(2, 0) |
| 184 | #define __extension__ /* delete __extension__ if non-gcc or gcc1 */ |
| 185 | #endif |
| 186 | |
| 187 | /* |
| 188 | * GCC1 and some versions of GCC2 declare dead (non-returning) and |
| 189 | * pure (no side effects) functions using "volatile" and "const"; |
| 190 | * unfortunately, these then cause warnings under "-ansi -pedantic". |
| 191 | * GCC2 uses a new, peculiar __attribute__((attrs)) style. All of |
| 192 | * these work for GNU C++ (modulo a slight glitch in the C++ grammar |
| 193 | * in the distribution version of 2.5.5). |
| 194 | * |
| 195 | * GCC defines a pure function as depending only on its arguments and |
| 196 | * global variables. Typical examples are strlen and sqrt. |
| 197 | * |
| 198 | * GCC defines a const function as depending only on its arguments. |
| 199 | * Therefore calling a const function again with identical arguments |
| 200 | * will always produce the same result. |
| 201 | * |
| 202 | * Rounding modes for floating point operations are considered global |
| 203 | * variables and prevent sqrt from being a const function. |
| 204 | * |
| 205 | * Calls to const functions can be optimised away and moved around |
| 206 | * without limitations. |
| 207 | */ |
| 208 | #if !__GNUC_PREREQ__(2, 0) |
| 209 | #define __attribute__(x) |
| 210 | #endif |
| 211 | |
| 212 | #if __GNUC_PREREQ__(2, 5) |
| 213 | #define __dead __attribute__((__noreturn__)) |
| 214 | #elif defined(__GNUC__) |
| 215 | #define __dead __volatile |
| 216 | #else |
| 217 | #define __dead |
| 218 | #endif |
| 219 | |
| 220 | #if __GNUC_PREREQ__(2, 96) |
| 221 | #define __pure __attribute__((__pure__)) |
| 222 | #elif defined(__GNUC__) |
| 223 | #define __pure __const |
| 224 | #else |
| 225 | #define __pure |
| 226 | #endif |
| 227 | |
| 228 | #if __GNUC_PREREQ__(2, 5) |
| 229 | #define __constfunc __attribute__((__const__)) |
| 230 | #else |
| 231 | #define __constfunc |
| 232 | #endif |
| 233 | |
| 234 | #if __GNUC_PREREQ__(3, 0) |
| 235 | #define __noinline __attribute__((__noinline__)) |
| 236 | #else |
| 237 | #define __noinline /* nothing */ |
| 238 | #endif |
| 239 | |
| 240 | #if __GNUC_PREREQ__(3, 0) |
| 241 | #define __always_inline __attribute__((__always_inline__)) |
| 242 | #else |
| 243 | #define __always_inline /* nothing */ |
| 244 | #endif |
| 245 | |
| 246 | #if __GNUC_PREREQ__(4, 1) |
| 247 | #define __returns_twice __attribute__((__returns_twice__)) |
| 248 | #else |
| 249 | #define __returns_twice /* nothing */ |
| 250 | #endif |
| 251 | |
| 252 | #if __GNUC_PREREQ__(4, 5) |
| 253 | #define __noclone __attribute__((__noclone__)) |
| 254 | #else |
| 255 | #define __noclone /* nothing */ |
| 256 | #endif |
| 257 | |
| 258 | /* |
| 259 | * __unused: Note that item or function might be unused. |
| 260 | */ |
| 261 | #if __GNUC_PREREQ__(2, 7) |
| 262 | #define __unused __attribute__((__unused__)) |
| 263 | #else |
| 264 | #define __unused /* delete */ |
| 265 | #endif |
| 266 | |
| 267 | /* |
| 268 | * __used: Note that item is needed, even if it appears to be unused. |
| 269 | */ |
| 270 | #if __GNUC_PREREQ__(3, 1) |
| 271 | #define __used __attribute__((__used__)) |
| 272 | #else |
| 273 | #define __used __unused |
| 274 | #endif |
| 275 | |
| 276 | /* |
| 277 | * __diagused: Note that item is used in diagnostic code, but may be |
| 278 | * unused in non-diagnostic code. |
| 279 | */ |
| 280 | #if (defined(_KERNEL) && defined(DIAGNOSTIC)) \ |
| 281 | || (!defined(_KERNEL) && !defined(NDEBUG)) |
| 282 | #define __diagused /* empty */ |
| 283 | #else |
| 284 | #define __diagused __unused |
| 285 | #endif |
| 286 | |
| 287 | /* |
| 288 | * __debugused: Note that item is used in debug code, but may be |
| 289 | * unused in non-debug code. |
| 290 | */ |
| 291 | #if defined(DEBUG) |
| 292 | #define __debugused /* empty */ |
| 293 | #else |
| 294 | #define __debugused __unused |
| 295 | #endif |
| 296 | |
| 297 | #if __GNUC_PREREQ__(3, 1) |
| 298 | #define __noprofile __attribute__((__no_instrument_function__)) |
| 299 | #else |
| 300 | #define __noprofile /* nothing */ |
| 301 | #endif |
| 302 | |
| 303 | #if __GNUC_PREREQ__(4, 6) || defined(__clang__) |
| 304 | #define __unreachable() __builtin_unreachable() |
| 305 | #else |
| 306 | #define __unreachable() do {} while (/*CONSTCOND*/0) |
| 307 | #endif |
| 308 | |
| 309 | #if defined(__cplusplus) |
| 310 | #define __BEGIN_EXTERN_C extern "C" { |
| 311 | #define __END_EXTERN_C } |
| 312 | #define __static_cast(x,y) static_cast<x>(y) |
| 313 | #else |
| 314 | #define __BEGIN_EXTERN_C |
| 315 | #define __END_EXTERN_C |
| 316 | #define __static_cast(x,y) (x)y |
| 317 | #endif |
| 318 | |
| 319 | #if __GNUC_PREREQ__(4, 0) |
| 320 | # define __dso_public __attribute__((__visibility__("default"))) |
| 321 | # define __dso_hidden __attribute__((__visibility__("hidden"))) |
| 322 | # define __BEGIN_PUBLIC_DECLS \ |
| 323 | _Pragma("GCC visibility push(default)") __BEGIN_EXTERN_C |
| 324 | # define __END_PUBLIC_DECLS __END_EXTERN_C _Pragma("GCC visibility pop") |
| 325 | # define __BEGIN_HIDDEN_DECLS \ |
| 326 | _Pragma("GCC visibility push(hidden)") __BEGIN_EXTERN_C |
| 327 | # define __END_HIDDEN_DECLS __END_EXTERN_C _Pragma("GCC visibility pop") |
| 328 | #else |
| 329 | # define __dso_public |
| 330 | # define __dso_hidden |
| 331 | # define __BEGIN_PUBLIC_DECLS __BEGIN_EXTERN_C |
| 332 | # define __END_PUBLIC_DECLS __END_EXTERN_C |
| 333 | # define __BEGIN_HIDDEN_DECLS __BEGIN_EXTERN_C |
| 334 | # define __END_HIDDEN_DECLS __END_EXTERN_C |
| 335 | #endif |
| 336 | #if __GNUC_PREREQ__(4, 2) |
| 337 | # define __dso_protected __attribute__((__visibility__("protected"))) |
| 338 | #else |
| 339 | # define __dso_protected |
| 340 | #endif |
| 341 | |
| 342 | #define __BEGIN_DECLS __BEGIN_PUBLIC_DECLS |
| 343 | #define __END_DECLS __END_PUBLIC_DECLS |
| 344 | |
| 345 | /* |
| 346 | * Non-static C99 inline functions are optional bodies. They don't |
| 347 | * create global symbols if not used, but can be replaced if desirable. |
| 348 | * This differs from the behavior of GCC before version 4.3. The nearest |
| 349 | * equivalent for older GCC is `extern inline'. For newer GCC, use the |
| 350 | * gnu_inline attribute additionally to get the old behavior. |
| 351 | * |
| 352 | * For C99 compilers other than GCC, the C99 behavior is expected. |
| 353 | */ |
| 354 | #if defined(__GNUC__) && defined(__GNUC_STDC_INLINE__) |
| 355 | #define __c99inline extern __attribute__((__gnu_inline__)) __inline |
| 356 | #elif defined(__GNUC__) |
| 357 | #define __c99inline extern __inline |
| 358 | #elif defined(__STDC_VERSION__) |
| 359 | #define __c99inline __inline |
| 360 | #endif |
| 361 | |
| 362 | #if defined(__lint__) |
| 363 | #define __packed __packed |
| 364 | #define __aligned(x) /* delete */ |
| 365 | #define __section(x) /* delete */ |
| 366 | #elif __GNUC_PREREQ__(2, 7) || defined(__PCC__) |
| 367 | #define __packed __attribute__((__packed__)) |
| 368 | #define __aligned(x) __attribute__((__aligned__(x))) |
| 369 | #define __section(x) __attribute__((__section__(x))) |
| 370 | #elif defined(_MSC_VER) |
| 371 | #define __packed /* ignore */ |
| 372 | #else |
| 373 | #define __packed error: no __packed for this compiler |
| 374 | #define __aligned(x) error: no __aligned for this compiler |
| 375 | #define __section(x) error: no __section for this compiler |
| 376 | #endif |
| 377 | |
| 378 | /* |
| 379 | * C99 defines the restrict type qualifier keyword, which was made available |
| 380 | * in GCC 2.92. |
| 381 | */ |
| 382 | #if defined(__lint__) |
| 383 | #define __restrict /* delete __restrict when not supported */ |
| 384 | #elif __STDC_VERSION__ >= 199901L |
| 385 | #define __restrict restrict |
| 386 | #elif __GNUC_PREREQ__(2, 92) |
| 387 | #define __restrict __restrict__ |
| 388 | #else |
| 389 | #define __restrict /* delete __restrict when not supported */ |
| 390 | #endif |
| 391 | |
| 392 | /* |
| 393 | * C99 defines __func__ predefined identifier, which was made available |
| 394 | * in GCC 2.95. |
| 395 | */ |
| 396 | #if !(__STDC_VERSION__ >= 199901L) |
| 397 | #if __GNUC_PREREQ__(2, 6) |
| 398 | #define __func__ __PRETTY_FUNCTION__ |
| 399 | #elif __GNUC_PREREQ__(2, 4) |
| 400 | #define __func__ __FUNCTION__ |
| 401 | #else |
| 402 | #define __func__ "" |
| 403 | #endif |
| 404 | #endif /* !(__STDC_VERSION__ >= 199901L) */ |
| 405 | |
| 406 | #if defined(_KERNEL) |
| 407 | #if defined(NO_KERNEL_RCSIDS) |
| 408 | #undef __KERNEL_RCSID |
| 409 | #define __KERNEL_RCSID(_n, _s) /* nothing */ |
| 410 | #endif /* NO_KERNEL_RCSIDS */ |
| 411 | #endif /* _KERNEL */ |
| 412 | |
| 413 | #if !defined(_STANDALONE) && !defined(_KERNEL) |
| 414 | #if defined(__GNUC__) || defined(__PCC__) |
| 415 | #define __RENAME(x) ___RENAME(x) |
| 416 | #elif defined(__lint__) |
| 417 | #define __RENAME(x) __symbolrename(x) |
| 418 | #else |
| 419 | #error "No function renaming possible" |
| 420 | #endif /* __GNUC__ */ |
| 421 | #else /* _STANDALONE || _KERNEL */ |
| 422 | #define __RENAME(x) no renaming in kernel/standalone environment |
| 423 | #endif |
| 424 | |
| 425 | /* |
| 426 | * A barrier to stop the optimizer from moving code or assume live |
| 427 | * register values. This is gcc specific, the version is more or less |
| 428 | * arbitrary, might work with older compilers. |
| 429 | */ |
| 430 | #if __GNUC_PREREQ__(2, 95) |
| 431 | #define __insn_barrier() __asm __volatile("":::"memory") |
| 432 | #else |
| 433 | #define __insn_barrier() /* */ |
| 434 | #endif |
| 435 | |
| 436 | /* |
| 437 | * GNU C version 2.96 adds explicit branch prediction so that |
| 438 | * the CPU back-end can hint the processor and also so that |
| 439 | * code blocks can be reordered such that the predicted path |
| 440 | * sees a more linear flow, thus improving cache behavior, etc. |
| 441 | * |
| 442 | * The following two macros provide us with a way to use this |
| 443 | * compiler feature. Use __predict_true() if you expect the expression |
| 444 | * to evaluate to true, and __predict_false() if you expect the |
| 445 | * expression to evaluate to false. |
| 446 | * |
| 447 | * A few notes about usage: |
| 448 | * |
| 449 | * * Generally, __predict_false() error condition checks (unless |
| 450 | * you have some _strong_ reason to do otherwise, in which case |
| 451 | * document it), and/or __predict_true() `no-error' condition |
| 452 | * checks, assuming you want to optimize for the no-error case. |
| 453 | * |
| 454 | * * Other than that, if you don't know the likelihood of a test |
| 455 | * succeeding from empirical or other `hard' evidence, don't |
| 456 | * make predictions. |
| 457 | * |
| 458 | * * These are meant to be used in places that are run `a lot'. |
| 459 | * It is wasteful to make predictions in code that is run |
| 460 | * seldomly (e.g. at subsystem initialization time) as the |
| 461 | * basic block reordering that this affects can often generate |
| 462 | * larger code. |
| 463 | */ |
| 464 | #if __GNUC_PREREQ__(2, 96) |
| 465 | #define __predict_true(exp) __builtin_expect((exp) != 0, 1) |
| 466 | #define __predict_false(exp) __builtin_expect((exp) != 0, 0) |
| 467 | #else |
| 468 | #define __predict_true(exp) (exp) |
| 469 | #define __predict_false(exp) (exp) |
| 470 | #endif |
| 471 | |
| 472 | /* |
| 473 | * Compiler-dependent macros to declare that functions take printf-like |
| 474 | * or scanf-like arguments. They are null except for versions of gcc |
| 475 | * that are known to support the features properly (old versions of gcc-2 |
| 476 | * didn't permit keeping the keywords out of the application namespace). |
| 477 | */ |
| 478 | #if __GNUC_PREREQ__(2, 7) |
| 479 | #define __printflike(fmtarg, firstvararg) \ |
| 480 | __attribute__((__format__ (__printf__, fmtarg, firstvararg))) |
| 481 | #ifndef __syslog_attribute__ |
| 482 | #define __syslog__ __printf__ |
| 483 | #endif |
| 484 | #define __sysloglike(fmtarg, firstvararg) \ |
| 485 | __attribute__((__format__ (__syslog__, fmtarg, firstvararg))) |
| 486 | #define __scanflike(fmtarg, firstvararg) \ |
| 487 | __attribute__((__format__ (__scanf__, fmtarg, firstvararg))) |
| 488 | #define __format_arg(fmtarg) __attribute__((__format_arg__ (fmtarg))) |
| 489 | #else |
| 490 | #define __printflike(fmtarg, firstvararg) /* nothing */ |
| 491 | #define __scanflike(fmtarg, firstvararg) /* nothing */ |
| 492 | #define __sysloglike(fmtarg, firstvararg) /* nothing */ |
| 493 | #define __format_arg(fmtarg) /* nothing */ |
| 494 | #endif |
| 495 | |
| 496 | /* |
| 497 | * Macros for manipulating "link sets". Link sets are arrays of pointers |
| 498 | * to objects, which are gathered up by the linker. |
| 499 | * |
| 500 | * Object format-specific code has provided us with the following macros: |
| 501 | * |
| 502 | * __link_set_add_text(set, sym) |
| 503 | * Add a reference to the .text symbol `sym' to `set'. |
| 504 | * |
| 505 | * __link_set_add_rodata(set, sym) |
| 506 | * Add a reference to the .rodata symbol `sym' to `set'. |
| 507 | * |
| 508 | * __link_set_add_data(set, sym) |
| 509 | * Add a reference to the .data symbol `sym' to `set'. |
| 510 | * |
| 511 | * __link_set_add_bss(set, sym) |
| 512 | * Add a reference to the .bss symbol `sym' to `set'. |
| 513 | * |
| 514 | * __link_set_decl(set, ptype) |
| 515 | * Provide an extern declaration of the set `set', which |
| 516 | * contains an array of pointers to type `ptype'. This |
| 517 | * macro must be used by any code which wishes to reference |
| 518 | * the elements of a link set. |
| 519 | * |
| 520 | * __link_set_start(set) |
| 521 | * This points to the first slot in the link set. |
| 522 | * |
| 523 | * __link_set_end(set) |
| 524 | * This points to the (non-existent) slot after the last |
| 525 | * entry in the link set. |
| 526 | * |
| 527 | * __link_set_count(set) |
| 528 | * Count the number of entries in link set `set'. |
| 529 | * |
| 530 | * In addition, we provide the following macros for accessing link sets: |
| 531 | * |
| 532 | * __link_set_foreach(pvar, set) |
| 533 | * Iterate over the link set `set'. Because a link set is |
| 534 | * an array of pointers, pvar must be declared as "type **pvar", |
| 535 | * and the actual entry accessed as "*pvar". |
| 536 | * |
| 537 | * __link_set_entry(set, idx) |
| 538 | * Access the link set entry at index `idx' from set `set'. |
| 539 | */ |
| 540 | #define __link_set_foreach(pvar, set) \ |
| 541 | for (pvar = __link_set_start(set); pvar < __link_set_end(set); pvar++) |
| 542 | |
| 543 | #define __link_set_entry(set, idx) (__link_set_start(set)[idx]) |
| 544 | |
| 545 | /* |
| 546 | * Return the natural alignment in bytes for the given type |
| 547 | */ |
| 548 | #if __GNUC_PREREQ__(4, 1) |
| 549 | #define __alignof(__t) __alignof__(__t) |
| 550 | #else |
| 551 | #define __alignof(__t) (sizeof(struct { char __x; __t __y; }) - sizeof(__t)) |
| 552 | #endif |
| 553 | |
| 554 | /* |
| 555 | * Return the number of elements in a statically-allocated array, |
| 556 | * __x. |
| 557 | */ |
| 558 | #define __arraycount(__x) (sizeof(__x) / sizeof(__x[0])) |
| 559 | |
| 560 | #ifndef __ASSEMBLER__ |
| 561 | /* __BIT(n): nth bit, where __BIT(0) == 0x1. */ |
| 562 | #define __BIT(__n) \ |
| 563 | (((uintmax_t)(__n) >= NBBY * sizeof(uintmax_t)) ? 0 : \ |
| 564 | ((uintmax_t)1 << (uintmax_t)((__n) & (NBBY * sizeof(uintmax_t) - 1)))) |
| 565 | |
| 566 | /* __BITS(m, n): bits m through n, m < n. */ |
| 567 | #define __BITS(__m, __n) \ |
| 568 | ((__BIT(MAX((__m), (__n)) + 1) - 1) ^ (__BIT(MIN((__m), (__n))) - 1)) |
| 569 | #endif /* !__ASSEMBLER__ */ |
| 570 | |
| 571 | /* find least significant bit that is set */ |
| 572 | #define __LOWEST_SET_BIT(__mask) ((((__mask) - 1) & (__mask)) ^ (__mask)) |
| 573 | |
| 574 | #define __PRIuBIT PRIuMAX |
| 575 | #define __PRIuBITS __PRIuBIT |
| 576 | |
| 577 | #define __PRIxBIT PRIxMAX |
| 578 | #define __PRIxBITS __PRIxBIT |
| 579 | |
| 580 | #define __SHIFTOUT(__x, __mask) (((__x) & (__mask)) / __LOWEST_SET_BIT(__mask)) |
| 581 | #define __SHIFTIN(__x, __mask) ((__x) * __LOWEST_SET_BIT(__mask)) |
| 582 | #define __SHIFTOUT_MASK(__mask) __SHIFTOUT((__mask), (__mask)) |
| 583 | |
| 584 | /* |
| 585 | * Only to be used in other headers that are included from both c or c++ |
| 586 | * NOT to be used in code. |
| 587 | */ |
| 588 | #ifdef __cplusplus |
| 589 | #define __CAST(__dt, __st) static_cast<__dt>(__st) |
| 590 | #else |
| 591 | #define __CAST(__dt, __st) ((__dt)(__st)) |
| 592 | #endif |
| 593 | |
| 594 | #define __CASTV(__dt, __st) __CAST(__dt, __CAST(void *, __st)) |
| 595 | #define __CASTCV(__dt, __st) __CAST(__dt, __CAST(const void *, __st)) |
| 596 | |
| 597 | #define __USE(a) ((void)(a)) |
| 598 | |
| 599 | #define __type_mask(t) (/*LINTED*/sizeof(t) < sizeof(intmax_t) ? \ |
| 600 | (~((1ULL << (sizeof(t) * NBBY)) - 1)) : 0ULL) |
| 601 | |
| 602 | #ifndef __ASSEMBLER__ |
| 603 | static __inline long long __zeroll(void) { return 0; } |
| 604 | static __inline unsigned long long __zeroull(void) { return 0; } |
| 605 | #else |
| 606 | #define __zeroll() (0LL) |
| 607 | #define __zeroull() (0ULL) |
| 608 | #endif |
| 609 | |
| 610 | #define __negative_p(x) (!((x) > 0) && ((x) != 0)) |
| 611 | |
| 612 | #define __type_min_s(t) ((t)((1ULL << (sizeof(t) * NBBY - 1)))) |
| 613 | #define __type_max_s(t) ((t)~((1ULL << (sizeof(t) * NBBY - 1)))) |
| 614 | #define __type_min_u(t) ((t)0ULL) |
| 615 | #define __type_max_u(t) ((t)~0ULL) |
| 616 | #define __type_is_signed(t) (/*LINTED*/__type_min_s(t) + (t)1 < (t)1) |
| 617 | #define __type_min(t) (__type_is_signed(t) ? __type_min_s(t) : __type_min_u(t)) |
| 618 | #define __type_max(t) (__type_is_signed(t) ? __type_max_s(t) : __type_max_u(t)) |
| 619 | |
| 620 | |
| 621 | #define __type_fit_u(t, a) (/*LINTED*/!__negative_p(a) && \ |
| 622 | (uintmax_t)((a) + __zeroull()) <= (uintmax_t)__type_max_u(t)) |
| 623 | |
| 624 | #define __type_fit_s(t, a) (/*LINTED*/__negative_p(a) ? \ |
| 625 | ((intmax_t)((a) + __zeroll()) >= (intmax_t)__type_min_s(t)) : \ |
| 626 | ((intmax_t)((a) + __zeroll()) >= (intmax_t)0 && \ |
| 627 | (intmax_t)((a) + __zeroll()) <= (intmax_t)__type_max_s(t))) |
| 628 | |
| 629 | /* |
| 630 | * return true if value 'a' fits in type 't' |
| 631 | */ |
| 632 | #define __type_fit(t, a) (__type_is_signed(t) ? \ |
| 633 | __type_fit_s(t, a) : __type_fit_u(t, a)) |
| 634 | |
| 635 | #endif /* !_SYS_CDEFS_H_ */ |
| 636 | |