compiler.h

   1 /* ----------------------------------------------------------------------- *
   2  *
   3  *   Copyright 2007-2009 The NASM Authors - All Rights Reserved
   4  *   See the file AUTHORS included with the NASM distribution for
   5  *   the specific copyright holders.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following
   9  *   conditions are met:
  10  *
  11  *   * Redistributions of source code must retain the above copyright
  12  *     notice, this list of conditions and the following disclaimer.
  13  *   * Redistributions in binary form must reproduce the above
  14  *     copyright notice, this list of conditions and the following
  15  *     disclaimer in the documentation and/or other materials provided
  16  *     with the distribution.
  17  *
  18  *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
  19  *     CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  20  *     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  21  *     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  22  *     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  23  *     CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24  *     SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  25  *     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  26  *     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  *     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  29  *     OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
  30  *     EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31  *
  32  * ----------------------------------------------------------------------- */
  33
  34 /*
  35  * compiler.h
  36  *
  37  * Compiler-specific macros for NASM.  Feel free to add support for
  38  * other compilers in here.
  39  *
  40  * This header file should be included before any other header.
  41  */
  42
  43 #ifndef NASM_COMPILER_H
  44 #define NASM_COMPILER_H 1
  45
  46 #ifdef HAVE_CONFIG_H
  47 # include "config.h"
  48 /* autoconf doesn't define these if they are redundant, but we want to
  49    be able to #ifdef them... */
  50 #else
  51 /* Default these to unsupported unless we have config.h */
  52 # ifndef inline
  53 #  define inline
  54 # endif
  55 # ifndef restrict
  56 #  define restrict
  57 # endif
  58 #endif /* HAVE_CONFIG_H */
  59
  60 /* This is required to get the standard <inttypes.h> macros when compiling
  61    with a C++ compiler.  This must be defined *before* <inttypes.h> is
  62    included, directly or indirectly. */
  63 #define __STDC_CONSTANT_MACROS  1
  64 #define __STDC_LIMIT_MACROS     1
  65 #define __STDC_FORMAT_MACROS    1
  66
  67 #ifdef __GNUC__
  68 # if __GNUC__ >= 4
  69 #  define HAVE_GNUC_4
  70 # endif
  71 # if __GNUC__ >= 3
  72 #  define HAVE_GNUC_3
  73 # endif
  74 #endif
  75
  76 #ifdef __GNUC__
  77 # define _unused        __attribute__((unused))
  78 #else
  79 # define _unused
  80 #endif
  81
  82 /* Some versions of MSVC have these only with underscores in front */
  83 #include <stddef.h>
  84 #include <stdarg.h>
  85 #include <stdio.h>
  86
  87 #ifndef HAVE_SNPRINTF
  88 # ifdef HAVE__SNPRINTF
  89 #  define snprintf _snprintf
  90 # else
  91 int snprintf(char *, size_t, const char *, ...);
  92 # endif
  93 #endif
  94
  95 #ifndef HAVE_VSNPRINTF
  96 # ifdef HAVE__VSNPRINT
  97 #  define vsnprintf _vsnprintf
  98 # else
  99 int vsnprintf(char *, size_t, const char *, va_list);
 100 # endif
 101 #endif
 102
 103 #ifndef __cplusplus             /* C++ has false, true, bool as keywords */
 104 # if defined(HAVE_STDBOOL_H) && defined(HAVE_WORKING_BOOL)
 105 #  include <stdbool.h>
 106 # else
 107 /* This is sort of dangerous, since casts will behave different than
 108    casting to the standard boolean type.  Always use !!, not (bool). */
 109 typedef enum bool { false, true } bool;
 110 # endif
 111 #endif
 112
 113 /* Provide a substitute for offsetof() if we don't have one.  This
 114    variant works on most (but not *all*) systems... */
 115 #ifndef offsetof
 116 # define offsetof(t,m) ((size_t)&(((t *)0)->m))
 117 #endif
 118
 119 /* The container_of construct: if p is a pointer to member m of
 120    container class c, then return a pointer to the container of which
 121    *p is a member. */
 122 #ifndef container_of
 123 # define container_of(p, c, m) ((c *)((char *)(p) - offsetof(c,m)))
 124 #endif
 125
 126 /* Some misguided platforms hide the defs for these */
 127 #if defined(HAVE_STRCASECMP) && !HAVE_DECL_STRCASECMP
 128 int strcasecmp(const char *, const char *);
 129 #endif
 130
 131 #if defined(HAVE_STRICMP) && !HAVE_DECL_STRICMP
 132 int stricmp(const char *, const char *);
 133 #endif
 134
 135 #if defined(HAVE_STRNCASECMP) && !HAVE_DECL_STRNCASECMP
 136 int strncasecmp(const char *, const char *, size_t);
 137 #endif
 138
 139 #if defined(HAVE_STRNICMP) && !HAVE_DECL_STRNICMP
 140 int strnicmp(const char *, const char *, size_t);
 141 #endif
 142
 143 #if defined(HAVE_STRSEP) && !HAVE_DECL_STRSEP
 144 char *strsep(char **, const char *);
 145 #endif
 146
 147 /*
 148  * Define this to 1 for faster performance if this is a littleendian
 149  * platform which can do unaligned memory references.  It is safe
 150  * to leave it defined to 0 even if that is true.
 151  */
 152 #if defined(__386__) || defined(__i386__) || defined(__x86_64__)
 153 # define X86_MEMORY 1
 154 # ifndef WORDS_LITTLEENDIAN
 155 #  define WORDS_LITTLEENDIAN 1
 156 # endif
 157 #else
 158 # define X86_MEMORY 0
 159 #endif
 160
 161 /*
 162  * Hints to the compiler that a particular branch of code is more or
 163  * less likely to be taken.
 164  */
 165 #if defined(__GNUC__) && __GNUC__ >= 3
 166 # define likely(x)      __builtin_expect(!!(x), 1)
 167 # define unlikely(x)    __builtin_expect(!!(x), 0)
 168 #else
 169 # define likely(x)      (!!(x))
 170 # define unlikely(x)    (!!(x))
 171 #endif
 172
 173 /*
 174  * How to tell the compiler that a function doesn't return
 175  */
 176 #ifdef __GNUC__
 177 # define noreturn void __attribute__((noreturn))
 178 #else
 179 # define noreturn void
 180 #endif
 181
 182 #endif  /* NASM_COMPILER_H */