1/* $NetBSD: cdefs.h,v 1.58 2004/12/11 05:59:00 christos Exp $ */ 2 3/* 4 * Copyright (c) 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Berkeley Software Design, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)cdefs.h 8.8 (Berkeley) 1/9/95 35 */ 36 37#ifndef _SYS_CDEFS_H_ 38#define _SYS_CDEFS_H_ 39 40 41/* our implementation of wchar_t is only 8-bit - die die non-portable code */ 42#undef __WCHAR_TYPE__ 43#define __WCHAR_TYPE__ unsigned char 44 45 46/* 47 * Macro to test if we're using a GNU C compiler of a specific vintage 48 * or later, for e.g. features that appeared in a particular version 49 * of GNU C. Usage: 50 * 51 * #if __GNUC_PREREQ__(major, minor) 52 * ...cool feature... 53 * #else 54 * ...delete feature... 55 * #endif 56 */ 57#ifdef __GNUC__ 58#define __GNUC_PREREQ__(x, y) \ 59 ((__GNUC__ == (x) && __GNUC_MINOR__ >= (y)) || \ 60 (__GNUC__ > (x))) 61#else 62#define __GNUC_PREREQ__(x, y) 0 63#endif 64 65#include <sys/cdefs_elf.h> 66 67#if defined(__cplusplus) 68#define __BEGIN_DECLS extern "C" { 69#define __END_DECLS } 70#define __static_cast(x,y) static_cast<x>(y) 71#else 72#define __BEGIN_DECLS 73#define __END_DECLS 74#define __static_cast(x,y) (x)y 75#endif 76 77/* 78 * The __CONCAT macro is used to concatenate parts of symbol names, e.g. 79 * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo. 80 * The __CONCAT macro is a bit tricky -- make sure you don't put spaces 81 * in between its arguments. __CONCAT can also concatenate double-quoted 82 * strings produced by the __STRING macro, but this only works with ANSI C. 83 */ 84 85#define ___STRING(x) __STRING(x) 86#define ___CONCAT(x,y) __CONCAT(x,y) 87 88#if __STDC__ || defined(__cplusplus) 89#define __P(protos) protos /* full-blown ANSI C */ 90#define __CONCAT(x,y) x ## y 91#define __STRING(x) #x 92 93#define __const const /* define reserved names to standard */ 94#define __signed signed 95#define __volatile volatile 96#if defined(__cplusplus) 97#define __inline inline /* convert to C++ keyword */ 98#else 99#if !defined(__GNUC__) && !defined(__lint__) 100#define __inline /* delete GCC keyword */ 101#endif /* !__GNUC__ && !__lint__ */ 102#endif /* !__cplusplus */ 103 104#else /* !(__STDC__ || __cplusplus) */ 105#define __P(protos) () /* traditional C preprocessor */ 106#define __CONCAT(x,y) x/**/y 107#define __STRING(x) "x" 108 109#ifndef __GNUC__ 110#define __const /* delete pseudo-ANSI C keywords */ 111#define __inline 112#define __signed 113#define __volatile 114#endif /* !__GNUC__ */ 115 116/* 117 * In non-ANSI C environments, new programs will want ANSI-only C keywords 118 * deleted from the program and old programs will want them left alone. 119 * Programs using the ANSI C keywords const, inline etc. as normal 120 * identifiers should define -DNO_ANSI_KEYWORDS. 121 */ 122#ifndef NO_ANSI_KEYWORDS 123#define const __const /* convert ANSI C keywords */ 124#define inline __inline 125#define signed __signed 126#define volatile __volatile 127#endif /* !NO_ANSI_KEYWORDS */ 128#endif /* !(__STDC__ || __cplusplus) */ 129 130/* 131 * Used for internal auditing of the NetBSD source tree. 132 */ 133#ifdef __AUDIT__ 134#define __aconst __const 135#else 136#define __aconst 137#endif 138 139/* 140 * The following macro is used to remove const cast-away warnings 141 * from gcc -Wcast-qual; it should be used with caution because it 142 * can hide valid errors; in particular most valid uses are in 143 * situations where the API requires it, not to cast away string 144 * constants. We don't use *intptr_t on purpose here and we are 145 * explicit about unsigned long so that we don't have additional 146 * dependencies. 147 */ 148#define __UNCONST(a) ((void *)(unsigned long)(const void *)(a)) 149 150/* 151 * GCC2 provides __extension__ to suppress warnings for various GNU C 152 * language extensions under "-ansi -pedantic". 153 */ 154#if !__GNUC_PREREQ__(2, 0) 155#define __extension__ /* delete __extension__ if non-gcc or gcc1 */ 156#endif 157 158/* 159 * GCC1 and some versions of GCC2 declare dead (non-returning) and 160 * pure (no side effects) functions using "volatile" and "const"; 161 * unfortunately, these then cause warnings under "-ansi -pedantic". 162 * GCC2 uses a new, peculiar __attribute__((attrs)) style. All of 163 * these work for GNU C++ (modulo a slight glitch in the C++ grammar 164 * in the distribution version of 2.5.5). 165 */ 166#if !__GNUC_PREREQ__(2, 5) 167#define __attribute__(x) /* delete __attribute__ if non-gcc or gcc1 */ 168#if defined(__GNUC__) && !defined(__STRICT_ANSI__) 169#define __dead __volatile 170#define __pure __const 171#endif 172#endif 173 174/* Delete pseudo-keywords wherever they are not available or needed. */ 175#ifndef __dead 176#define __dead 177#define __pure 178#endif 179 180#if __GNUC_PREREQ__(2, 7) 181#define __unused __attribute__((__unused__)) 182#else 183#define __unused /* delete */ 184#endif 185 186#if __GNUC_PREREQ__(3, 1) 187#define __used __attribute__((__used__)) 188#else 189#define __used /* delete */ 190#endif 191 192#if __GNUC_PREREQ__(2, 7) 193#define __packed __attribute__((__packed__)) 194#define __aligned(x) __attribute__((__aligned__(x))) 195#define __section(x) __attribute__((__section__(x))) 196#elif defined(__lint__) 197#define __packed /* delete */ 198#define __aligned(x) /* delete */ 199#define __section(x) /* delete */ 200#else 201#define __packed error: no __packed for this compiler 202#define __aligned(x) error: no __aligned for this compiler 203#define __section(x) error: no __section for this compiler 204#endif 205 206#if !__GNUC_PREREQ__(2, 8) 207#define __extension__ 208#endif 209 210#if __GNUC_PREREQ__(2, 8) 211#define __statement(x) __extension__(x) 212#elif defined(lint) 213#define __statement(x) (0) 214#else 215#define __statement(x) (x) 216#endif 217 218/* 219 * C99 defines the restrict type qualifier keyword, which was made available 220 * in GCC 2.92. 221 */ 222#if __STDC_VERSION__ >= 199901L 223#define __restrict restrict 224#else 225#if !__GNUC_PREREQ__(2, 92) 226#define __restrict /* delete __restrict when not supported */ 227#endif 228#endif 229 230/* 231 * C99 defines __func__ predefined identifier, which was made available 232 * in GCC 2.95. 233 */ 234#if !(__STDC_VERSION__ >= 199901L) 235#if __GNUC_PREREQ__(2, 6) 236#define __func__ __PRETTY_FUNCTION__ 237#elif __GNUC_PREREQ__(2, 4) 238#define __func__ __FUNCTION__ 239#else 240#define __func__ "" 241#endif 242#endif /* !(__STDC_VERSION__ >= 199901L) */ 243 244#if defined(_KERNEL) 245#if defined(NO_KERNEL_RCSIDS) 246#undef __KERNEL_RCSID 247#define __KERNEL_RCSID(_n, _s) /* nothing */ 248#endif /* NO_KERNEL_RCSIDS */ 249#endif /* _KERNEL */ 250 251#if !defined(_STANDALONE) && !defined(_KERNEL) 252#ifdef __GNUC__ 253#define __RENAME(x) ___RENAME(x) 254#else 255#ifdef __lint__ 256#define __RENAME(x) __symbolrename(x) 257#else 258#error "No function renaming possible" 259#endif /* __lint__ */ 260#endif /* __GNUC__ */ 261#else /* _STANDALONE || _KERNEL */ 262#define __RENAME(x) no renaming in kernel or standalone environment 263#endif 264 265/* 266 * A barrier to stop the optimizer from moving code or assume live 267 * register values. This is gcc specific, the version is more or less 268 * arbitrary, might work with older compilers. 269 */ 270#if __GNUC_PREREQ__(2, 95) 271#define __insn_barrier() __asm __volatile("":::"memory") 272#else 273#define __insn_barrier() /* */ 274#endif 275 276/* 277 * GNU C version 2.96 adds explicit branch prediction so that 278 * the CPU back-end can hint the processor and also so that 279 * code blocks can be reordered such that the predicted path 280 * sees a more linear flow, thus improving cache behavior, etc. 281 * 282 * The following two macros provide us with a way to use this 283 * compiler feature. Use __predict_true() if you expect the expression 284 * to evaluate to true, and __predict_false() if you expect the 285 * expression to evaluate to false. 286 * 287 * A few notes about usage: 288 * 289 * * Generally, __predict_false() error condition checks (unless 290 * you have some _strong_ reason to do otherwise, in which case 291 * document it), and/or __predict_true() `no-error' condition 292 * checks, assuming you want to optimize for the no-error case. 293 * 294 * * Other than that, if you don't know the likelihood of a test 295 * succeeding from empirical or other `hard' evidence, don't 296 * make predictions. 297 * 298 * * These are meant to be used in places that are run `a lot'. 299 * It is wasteful to make predictions in code that is run 300 * seldomly (e.g. at subsystem initialization time) as the 301 * basic block reordering that this affects can often generate 302 * larger code. 303 */ 304#if __GNUC_PREREQ__(2, 96) 305#define __predict_true(exp) __builtin_expect((exp) != 0, 1) 306#define __predict_false(exp) __builtin_expect((exp) != 0, 0) 307#else 308#define __predict_true(exp) (exp) 309#define __predict_false(exp) (exp) 310#endif 311 312#if __GNUC_PREREQ__(2, 96) 313#define __noreturn __attribute__((__noreturn__)) 314#define __mallocfunc __attribute__((malloc)) 315#else 316#define __noreturn 317#define __mallocfunc 318#endif 319 320/* 321 * Macros for manipulating "link sets". Link sets are arrays of pointers 322 * to objects, which are gathered up by the linker. 323 * 324 * Object format-specific code has provided us with the following macros: 325 * 326 * __link_set_add_text(set, sym) 327 * Add a reference to the .text symbol `sym' to `set'. 328 * 329 * __link_set_add_rodata(set, sym) 330 * Add a reference to the .rodata symbol `sym' to `set'. 331 * 332 * __link_set_add_data(set, sym) 333 * Add a reference to the .data symbol `sym' to `set'. 334 * 335 * __link_set_add_bss(set, sym) 336 * Add a reference to the .bss symbol `sym' to `set'. 337 * 338 * __link_set_decl(set, ptype) 339 * Provide an extern declaration of the set `set', which 340 * contains an array of the pointer type `ptype'. This 341 * macro must be used by any code which wishes to reference 342 * the elements of a link set. 343 * 344 * __link_set_start(set) 345 * This points to the first slot in the link set. 346 * 347 * __link_set_end(set) 348 * This points to the (non-existent) slot after the last 349 * entry in the link set. 350 * 351 * __link_set_count(set) 352 * Count the number of entries in link set `set'. 353 * 354 * In addition, we provide the following macros for accessing link sets: 355 * 356 * __link_set_foreach(pvar, set) 357 * Iterate over the link set `set'. Because a link set is 358 * an array of pointers, pvar must be declared as "type **pvar", 359 * and the actual entry accessed as "*pvar". 360 * 361 * __link_set_entry(set, idx) 362 * Access the link set entry at index `idx' from set `set'. 363 */ 364#define __link_set_foreach(pvar, set) \ 365 for (pvar = __link_set_start(set); pvar < __link_set_end(set); pvar++) 366 367#define __link_set_entry(set, idx) (__link_set_begin(set)[idx]) 368 369/* 370 * Some of the recend FreeBSD sources used in Bionic need this. 371 * Originally, this is used to embed the rcs versions of each source file 372 * in the generated binary. We certainly don't want this in Bionic. 373 */ 374#define __FBSDID(s) struct __hack 375 376/*- 377 * The following definitions are an extension of the behavior originally 378 * implemented in <sys/_posix.h>, but with a different level of granularity. 379 * POSIX.1 requires that the macros we test be defined before any standard 380 * header file is included. 381 * 382 * Here's a quick run-down of the versions: 383 * defined(_POSIX_SOURCE) 1003.1-1988 384 * _POSIX_C_SOURCE == 1 1003.1-1990 385 * _POSIX_C_SOURCE == 2 1003.2-1992 C Language Binding Option 386 * _POSIX_C_SOURCE == 199309 1003.1b-1993 387 * _POSIX_C_SOURCE == 199506 1003.1c-1995, 1003.1i-1995, 388 * and the omnibus ISO/IEC 9945-1: 1996 389 * _POSIX_C_SOURCE == 200112 1003.1-2001 390 * _POSIX_C_SOURCE == 200809 1003.1-2008 391 * 392 * In addition, the X/Open Portability Guide, which is now the Single UNIX 393 * Specification, defines a feature-test macro which indicates the version of 394 * that specification, and which subsumes _POSIX_C_SOURCE. 395 * 396 * Our macros begin with two underscores to avoid namespace screwage. 397 */ 398 399/* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */ 400#if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 1 401#undef _POSIX_C_SOURCE /* Probably illegal, but beyond caring now. */ 402#define _POSIX_C_SOURCE 199009 403#endif 404 405/* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */ 406#if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 2 407#undef _POSIX_C_SOURCE 408#define _POSIX_C_SOURCE 199209 409#endif 410 411/* Deal with various X/Open Portability Guides and Single UNIX Spec. */ 412#ifdef _XOPEN_SOURCE 413#if _XOPEN_SOURCE - 0 >= 700 414#define __XSI_VISIBLE 700 415#undef _POSIX_C_SOURCE 416#define _POSIX_C_SOURCE 200809 417#elif _XOPEN_SOURCE - 0 >= 600 418#define __XSI_VISIBLE 600 419#undef _POSIX_C_SOURCE 420#define _POSIX_C_SOURCE 200112 421#elif _XOPEN_SOURCE - 0 >= 500 422#define __XSI_VISIBLE 500 423#undef _POSIX_C_SOURCE 424#define _POSIX_C_SOURCE 199506 425#endif 426#endif 427 428/* 429 * Deal with all versions of POSIX. The ordering relative to the tests above is 430 * important. 431 */ 432#if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE) 433#define _POSIX_C_SOURCE 198808 434#endif 435#ifdef _POSIX_C_SOURCE 436#if _POSIX_C_SOURCE >= 200809 437#define __POSIX_VISIBLE 200809 438#define __ISO_C_VISIBLE 1999 439#elif _POSIX_C_SOURCE >= 200112 440#define __POSIX_VISIBLE 200112 441#define __ISO_C_VISIBLE 1999 442#elif _POSIX_C_SOURCE >= 199506 443#define __POSIX_VISIBLE 199506 444#define __ISO_C_VISIBLE 1990 445#elif _POSIX_C_SOURCE >= 199309 446#define __POSIX_VISIBLE 199309 447#define __ISO_C_VISIBLE 1990 448#elif _POSIX_C_SOURCE >= 199209 449#define __POSIX_VISIBLE 199209 450#define __ISO_C_VISIBLE 1990 451#elif _POSIX_C_SOURCE >= 199009 452#define __POSIX_VISIBLE 199009 453#define __ISO_C_VISIBLE 1990 454#else 455#define __POSIX_VISIBLE 198808 456#define __ISO_C_VISIBLE 0 457#endif /* _POSIX_C_SOURCE */ 458#else 459/*- 460 * Deal with _ANSI_SOURCE: 461 * If it is defined, and no other compilation environment is explicitly 462 * requested, then define our internal feature-test macros to zero. This 463 * makes no difference to the preprocessor (undefined symbols in preprocessing 464 * expressions are defined to have value zero), but makes it more convenient for 465 * a test program to print out the values. 466 * 467 * If a program mistakenly defines _ANSI_SOURCE and some other macro such as 468 * _POSIX_C_SOURCE, we will assume that it wants the broader compilation 469 * environment (and in fact we will never get here). 470 */ 471#if defined(_ANSI_SOURCE) /* Hide almost everything. */ 472#define __POSIX_VISIBLE 0 473#define __XSI_VISIBLE 0 474#define __BSD_VISIBLE 0 475#define __ISO_C_VISIBLE 1990 476#elif defined(_C99_SOURCE) /* Localism to specify strict C99 env. */ 477#define __POSIX_VISIBLE 0 478#define __XSI_VISIBLE 0 479#define __BSD_VISIBLE 0 480#define __ISO_C_VISIBLE 1999 481#else /* Default environment: show everything. */ 482#define __POSIX_VISIBLE 200809 483#define __XSI_VISIBLE 700 484#define __BSD_VISIBLE 1 485#define __ISO_C_VISIBLE 1999 486#endif 487#endif 488 489/* 490 * Default values. 491 */ 492#ifndef __XPG_VISIBLE 493# define __XPG_VISIBLE 700 494#endif 495#ifndef __POSIX_VISIBLE 496# define __POSIX_VISIBLE 200809 497#endif 498#ifndef __ISO_C_VISIBLE 499# define __ISO_C_VISIBLE 1999 500#endif 501#ifndef __BSD_VISIBLE 502# define __BSD_VISIBLE 1 503#endif 504 505#define __BIONIC__ 1 506 507#endif /* !_SYS_CDEFS_H_ */ 508