The Design and Implementation of the FreeBSD Operating System, Second Edition
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sys/sys/cdefs.h

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    1 /*      $NetBSD: cdefs.h,v 1.58.8.1 2006/05/09 12:53:44 tron 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  * Macro to test if we're using a GNU C compiler of a specific vintage
   42  * or later, for e.g. features that appeared in a particular version
   43  * of GNU C.  Usage:
   44  *
   45  *      #if __GNUC_PREREQ__(major, minor)
   46  *      ...cool feature...
   47  *      #else
   48  *      ...delete feature...
   49  *      #endif
   50  */
   51 #ifdef __GNUC__
   52 #define __GNUC_PREREQ__(x, y)                                           \
   53         ((__GNUC__ == (x) && __GNUC_MINOR__ >= (y)) ||                  \
   54          (__GNUC__ > (x)))
   55 #else
   56 #define __GNUC_PREREQ__(x, y)   0
   57 #endif
   58 
   59 #include <machine/cdefs.h>
   60 #ifdef __ELF__
   61 #include <sys/cdefs_elf.h>
   62 #else
   63 #include <sys/cdefs_aout.h>
   64 #endif
   65 
   66 #if defined(__cplusplus)
   67 #define __BEGIN_DECLS           extern "C" {
   68 #define __END_DECLS             }
   69 #define __static_cast(x,y)      static_cast<x>(y)
   70 #else
   71 #define __BEGIN_DECLS
   72 #define __END_DECLS
   73 #define __static_cast(x,y)      (x)y
   74 #endif
   75 
   76 /*
   77  * The __CONCAT macro is used to concatenate parts of symbol names, e.g.
   78  * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
   79  * The __CONCAT macro is a bit tricky -- make sure you don't put spaces
   80  * in between its arguments.  __CONCAT can also concatenate double-quoted
   81  * strings produced by the __STRING macro, but this only works with ANSI C.
   82  */
   83 
   84 #define ___STRING(x)    __STRING(x)
   85 #define ___CONCAT(x,y)  __CONCAT(x,y)
   86 
   87 #if __STDC__ || defined(__cplusplus)
   88 #define __P(protos)     protos          /* full-blown ANSI C */
   89 #define __CONCAT(x,y)   x ## y
   90 #define __STRING(x)     #x
   91 
   92 #define __const         const           /* define reserved names to standard */
   93 #define __signed        signed
   94 #define __volatile      volatile
   95 #if defined(__cplusplus)
   96 #define __inline        inline          /* convert to C++ keyword */
   97 #else
   98 #if !defined(__GNUC__) && !defined(__lint__)
   99 #define __inline                        /* delete GCC keyword */
  100 #endif /* !__GNUC__  && !__lint__ */
  101 #endif /* !__cplusplus */
  102 
  103 #else   /* !(__STDC__ || __cplusplus) */
  104 #define __P(protos)     ()              /* traditional C preprocessor */
  105 #define __CONCAT(x,y)   x/**/y
  106 #define __STRING(x)     "x"
  107 
  108 #ifndef __GNUC__
  109 #define __const                         /* delete pseudo-ANSI C keywords */
  110 #define __inline
  111 #define __signed
  112 #define __volatile
  113 #endif  /* !__GNUC__ */
  114 
  115 /*
  116  * In non-ANSI C environments, new programs will want ANSI-only C keywords
  117  * deleted from the program and old programs will want them left alone.
  118  * Programs using the ANSI C keywords const, inline etc. as normal
  119  * identifiers should define -DNO_ANSI_KEYWORDS.
  120  */
  121 #ifndef NO_ANSI_KEYWORDS
  122 #define const           __const         /* convert ANSI C keywords */
  123 #define inline          __inline
  124 #define signed          __signed
  125 #define volatile        __volatile
  126 #endif /* !NO_ANSI_KEYWORDS */
  127 #endif  /* !(__STDC__ || __cplusplus) */
  128 
  129 /*
  130  * Used for internal auditing of the NetBSD source tree.
  131  */
  132 #ifdef __AUDIT__
  133 #define __aconst        __const
  134 #else
  135 #define __aconst
  136 #endif
  137 
  138 /*
  139  * The following macro is used to remove const cast-away warnings
  140  * from gcc -Wcast-qual; it should be used with caution because it
  141  * can hide valid errors; in particular most valid uses are in
  142  * situations where the API requires it, not to cast away string
  143  * constants. We don't use *intptr_t on purpose here and we are
  144  * explicit about unsigned long so that we don't have additional
  145  * dependencies.
  146  */
  147 #define __UNCONST(a)    ((void *)(unsigned long)(const void *)(a))
  148 
  149 /*
  150  * The following macro is used to remove the volatile cast-away warnings
  151  * from gcc -Wcast-qual; as above it should be used with caution
  152  * because it can hide valid errors or warnings.  Valid uses include
  153  * making it possible to pass a volatile pointer to memset().
  154  * For the same reasons as above, we use unsigned long and not intptr_t.
  155  */
  156 #define __UNVOLATILE(a) ((void *)(unsigned long)(volatile void *)(a))
  157 
  158 /*
  159  * GCC2 provides __extension__ to suppress warnings for various GNU C
  160  * language extensions under "-ansi -pedantic".
  161  */
  162 #if !__GNUC_PREREQ__(2, 0)
  163 #define __extension__           /* delete __extension__ if non-gcc or gcc1 */
  164 #endif
  165 
  166 /*
  167  * GCC1 and some versions of GCC2 declare dead (non-returning) and
  168  * pure (no side effects) functions using "volatile" and "const";
  169  * unfortunately, these then cause warnings under "-ansi -pedantic".
  170  * GCC2 uses a new, peculiar __attribute__((attrs)) style.  All of
  171  * these work for GNU C++ (modulo a slight glitch in the C++ grammar
  172  * in the distribution version of 2.5.5).
  173  */
  174 #if !__GNUC_PREREQ__(2, 5)
  175 #define __attribute__(x)        /* delete __attribute__ if non-gcc or gcc1 */
  176 #if defined(__GNUC__) && !defined(__STRICT_ANSI__)
  177 #define __dead          __volatile
  178 #define __pure          __const
  179 #endif
  180 #endif
  181 
  182 /* Delete pseudo-keywords wherever they are not available or needed. */
  183 #ifndef __dead
  184 #define __dead
  185 #define __pure
  186 #endif
  187 
  188 #if __GNUC_PREREQ__(2, 7)
  189 #define __unused        __attribute__((__unused__))
  190 #else
  191 #define __unused        /* delete */
  192 #endif
  193 
  194 #if __GNUC_PREREQ__(3, 1)
  195 #define __used          __attribute__((__used__))
  196 #else
  197 #define __used          /* delete */
  198 #endif
  199 
  200 #if __GNUC_PREREQ__(2, 7)
  201 #define __packed        __attribute__((__packed__))
  202 #define __aligned(x)    __attribute__((__aligned__(x)))
  203 #define __section(x)    __attribute__((__section__(x)))
  204 #elif defined(__lint__)
  205 #define __packed        /* delete */
  206 #define __aligned(x)    /* delete */
  207 #define __section(x)    /* delete */
  208 #else
  209 #define __packed        error: no __packed for this compiler
  210 #define __aligned(x)    error: no __aligned for this compiler
  211 #define __section(x)    error: no __section for this compiler
  212 #endif
  213 
  214 /*
  215  * C99 defines the restrict type qualifier keyword, which was made available
  216  * in GCC 2.92.
  217  */
  218 #if __STDC_VERSION__ >= 199901L
  219 #define __restrict      restrict
  220 #else
  221 #if !__GNUC_PREREQ__(2, 92)
  222 #define __restrict      /* delete __restrict when not supported */
  223 #endif
  224 #endif
  225 
  226 /*
  227  * C99 defines __func__ predefined identifier, which was made available
  228  * in GCC 2.95.
  229  */
  230 #if !(__STDC_VERSION__ >= 199901L)
  231 #if __GNUC_PREREQ__(2, 6)
  232 #define __func__        __PRETTY_FUNCTION__
  233 #elif __GNUC_PREREQ__(2, 4)
  234 #define __func__        __FUNCTION__
  235 #else
  236 #define __func__        ""
  237 #endif
  238 #endif /* !(__STDC_VERSION__ >= 199901L) */
  239 
  240 #if defined(_KERNEL)
  241 #if defined(NO_KERNEL_RCSIDS)
  242 #undef __KERNEL_RCSID
  243 #define __KERNEL_RCSID(_n, _s)          /* nothing */
  244 #endif /* NO_KERNEL_RCSIDS */
  245 #endif /* _KERNEL */
  246 
  247 #if !defined(_STANDALONE) && !defined(_KERNEL)
  248 #ifdef __GNUC__
  249 #define __RENAME(x)     ___RENAME(x)
  250 #else
  251 #ifdef __lint__
  252 #define __RENAME(x)     __symbolrename(x)
  253 #else
  254 #error "No function renaming possible"
  255 #endif /* __lint__ */
  256 #endif /* __GNUC__ */
  257 #else /* _STANDALONE || _KERNEL */
  258 #define __RENAME(x)     no renaming in kernel or standalone environment
  259 #endif
  260 
  261 /*
  262  * A barrier to stop the optimizer from moving code or assume live
  263  * register values. This is gcc specific, the version is more or less
  264  * arbitrary, might work with older compilers.
  265  */
  266 #if __GNUC_PREREQ__(2, 95)
  267 #define __insn_barrier()        __asm __volatile("":::"memory")
  268 #else
  269 #define __insn_barrier()        /* */
  270 #endif
  271 
  272 /*
  273  * GNU C version 2.96 adds explicit branch prediction so that
  274  * the CPU back-end can hint the processor and also so that
  275  * code blocks can be reordered such that the predicted path
  276  * sees a more linear flow, thus improving cache behavior, etc.
  277  *
  278  * The following two macros provide us with a way to use this
  279  * compiler feature.  Use __predict_true() if you expect the expression
  280  * to evaluate to true, and __predict_false() if you expect the
  281  * expression to evaluate to false.
  282  *
  283  * A few notes about usage:
  284  *
  285  *      * Generally, __predict_false() error condition checks (unless
  286  *        you have some _strong_ reason to do otherwise, in which case
  287  *        document it), and/or __predict_true() `no-error' condition
  288  *        checks, assuming you want to optimize for the no-error case.
  289  *
  290  *      * Other than that, if you don't know the likelihood of a test
  291  *        succeeding from empirical or other `hard' evidence, don't
  292  *        make predictions.
  293  *
  294  *      * These are meant to be used in places that are run `a lot'.
  295  *        It is wasteful to make predictions in code that is run
  296  *        seldomly (e.g. at subsystem initialization time) as the
  297  *        basic block reordering that this affects can often generate
  298  *        larger code.
  299  */
  300 #if __GNUC_PREREQ__(2, 96)
  301 #define __predict_true(exp)     __builtin_expect((exp) != 0, 1)
  302 #define __predict_false(exp)    __builtin_expect((exp) != 0, 0)
  303 #else
  304 #define __predict_true(exp)     (exp)
  305 #define __predict_false(exp)    (exp)
  306 #endif
  307 
  308 /*
  309  * Macros for manipulating "link sets".  Link sets are arrays of pointers
  310  * to objects, which are gathered up by the linker.
  311  *
  312  * Object format-specific code has provided us with the following macros:
  313  *
  314  *      __link_set_add_text(set, sym)
  315  *              Add a reference to the .text symbol `sym' to `set'.
  316  *
  317  *      __link_set_add_rodata(set, sym)
  318  *              Add a reference to the .rodata symbol `sym' to `set'.
  319  *
  320  *      __link_set_add_data(set, sym)
  321  *              Add a reference to the .data symbol `sym' to `set'.
  322  *
  323  *      __link_set_add_bss(set, sym)
  324  *              Add a reference to the .bss symbol `sym' to `set'.
  325  *
  326  *      __link_set_decl(set, ptype)
  327  *              Provide an extern declaration of the set `set', which
  328  *              contains an array of the pointer type `ptype'.  This
  329  *              macro must be used by any code which wishes to reference
  330  *              the elements of a link set.
  331  *
  332  *      __link_set_start(set)
  333  *              This points to the first slot in the link set.
  334  *
  335  *      __link_set_end(set)
  336  *              This points to the (non-existent) slot after the last
  337  *              entry in the link set.
  338  *
  339  *      __link_set_count(set)
  340  *              Count the number of entries in link set `set'.
  341  *
  342  * In addition, we provide the following macros for accessing link sets:
  343  *
  344  *      __link_set_foreach(pvar, set)
  345  *              Iterate over the link set `set'.  Because a link set is
  346  *              an array of pointers, pvar must be declared as "type **pvar",
  347  *              and the actual entry accessed as "*pvar".
  348  *
  349  *      __link_set_entry(set, idx)
  350  *              Access the link set entry at index `idx' from set `set'.
  351  */
  352 #define __link_set_foreach(pvar, set)                                   \
  353         for (pvar = __link_set_start(set); pvar < __link_set_end(set); pvar++)
  354 
  355 #define __link_set_entry(set, idx)      (__link_set_begin(set)[idx])
  356 
  357 #endif /* !_SYS_CDEFS_H_ */

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