compiler/arossupport/include/system.h

   1 #ifndef AROS_SYSTEM_H
   2 #define AROS_SYSTEM_H
   3
   4 /*
   5     Copyright © 1995-2010, The AROS Development Team. All rights reserved.
   6     $Id$
   7
   8     Desc: Analyse the current kind of system and compiler.
   9     Lang: english
  10 */
  11
  12 #ifndef AROS_CPU_H
  13 #   include <aros/cpu.h>
  14 #endif
  15
  16 /**************************************
  17                 Defines
  18 **************************************/
  19 /* 1. Analyze system: Specify a definitive define for each system */
  20 #if defined(_AMIGA) || defined(AMIGA)
  21 #   ifndef _AMIGA
  22 #       define _AMIGA
  23 #   endif
  24 #   ifndef AMIGA
  25 #       define AMIGA
  26 #   endif
  27 #endif
  28
  29 #if defined __GNUC__ && defined __GNUC_MINOR__
  30 #    define __GNUC_PREREQ(maj, min) \
  31          ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
  32 #else
  33 #    define __GNUC_PREREQ(maj, min) 0
  34 #endif
  35 #define __GNUC_PREREQ__ __GNUC_PREREQ
  36
  37
  38 /*
  39  * 2. Analyze compiler for STD C/C++.
  40  *
  41  * We test for the following:
  42  * a.   extern "C" linkage required for programs.
  43  * b.   inline, const, volatile, restrict keywords defined in
  44  *      newer C/C++ standards.
  45  * c.   throw() being available, which lets the compiler better
  46  *      optimize stuff
  47  */
  48
  49 #if defined(__cplusplus)
  50 #   define __EXTERN extern "C"
  51 #   define __BEGIN_DECLS    extern "C" {
  52 #   define __BEGIN_EXTERN   extern "C" {
  53 #   define __END_DECLS      };
  54 #   define __END_EXTERN     };
  55 #else
  56 #   define __EXTERN extern
  57 #   define __BEGIN_DECLS
  58 #   define __BEGIN_EXTERN
  59 #   define __END_DECLS
  60 #   define __END_EXTERN
  61 #endif
  62
  63 #if defined(__STDC__) || defined(__cplusplus)
  64 #   if !defined(__GNUC__)
  65 #       define      __const__       const
  66 #       define      __inline__      inline
  67 #       define      __volatile__    volatile
  68 #   endif
  69
  70 /*
  71  * C99 defines a new keyword restrict that can help do optimisation where
  72  * pointers are used in programs. We'd like to support optimisation :-)
  73  */
  74 #   if defined(__STDC_VERSION__) &&  __STDC_VERSION__ >= 199901L
  75 #       define      __restrict__    restrict
  76 #   else
  77 #       define      __restrict__
  78 #       define      restrict
  79 #   endif
  80
  81 #else
  82 #   define          __const__
  83 #   define          const
  84 #   define          __inline__
  85 #   define          inline
  86 #   define          __volatile__
  87 #   define          volatile
  88 #   define          __restrict__
  89 #   define          restrict
  90 #endif
  91
  92 #if defined(__GNUC__) && !defined(__THROW)
  93 #   if defined __cplusplus && __GNUC_PREREQ (2,8)
  94 #       define __THROW       throw ()
  95 #   else
  96 #       define __THROW
  97 #   endif
  98 #endif
  99
 100 /* 3. Macros for making things more efficient */
 101 #ifndef __packed
 102 #if __GNUC_PREREQ(2,5)
 103 #   define __packed __attribute__((__packed__))
 104 #else
 105 #   error Define __packed appropriately for your compiler!
 106 #endif
 107 #endif
 108
 109 #ifndef __noreturn
 110 #if __GNUC_PREREQ(2,5)
 111 #   define __noreturn  __attribute__((__noreturn__))
 112 #else
 113 #   define __noreturn
 114 #endif
 115 #endif
 116
 117 #ifndef __noeffect
 118 #if __GNUC_PREREQ(2,5) && !(__GNUC_PREREQ(2,6) && defined __cplusplus)
 119 #   define __noeffect  __attribute__((__const__))
 120 #else
 121 #   define __noeffect
 122 #endif
 123 #endif
 124
 125 #ifndef __unused
 126 # if __GNUC_PREREQ(2,7)
 127 #    define __unused   __attribute__((__unused__))
 128 # else
 129 #    define __unused
 130 # endif
 131 #endif
 132
 133 #ifndef __used
 134 # if __GNUC_PREREQ(3,3)
 135 #    define __used   __attribute__((__used__))
 136 # else
 137 #    define __used __unused
 138 # endif
 139 #endif
 140
 141 #ifndef __pure
 142 #if __GNUC_PREREQ(2,96)
 143 #    define __pure     __attribute__((__pure__))
 144 #else
 145 #    define __pure
 146 #endif
 147 #endif
 148
 149 #ifndef __const
 150 #if __GNUC_PREREQ(2,5)
 151 #    define __const     __attribute__((__const__))
 152 #else
 153 #    define __const
 154 #endif
 155 #endif
 156
 157 #ifndef __mayalias
 158 #if __GNUC_PREREQ(3,3)
 159 #    define __mayalias  __attribute__((__may_alias__))
 160 #else
 161 #    define __mayalias
 162 #endif
 163 #endif
 164
 165 #define __pure2 __const
 166
 167 /* 4. Macros for debugging and development */
 168 #if defined(__GNUC__) || defined(__INTEL_COMPILER) || (defined(__STDC__) && __STDC_VERSION__ >= 199901L)
 169 #if !defined(AROS_64BIT_TYPE)
 170 #   define AROS_64BIT_TYPE long long
 171 #endif
 172 #   define AROS_HAVE_LONG_LONG
 173 #endif
 174
 175 #if defined(__INTEL_COMPILER)
 176 #   ifdef inline
 177 #       undef inline
 178 #   endif
 179 #   define inline
 180 #endif
 181
 182 #if __GNUC__ <= 2
 183 #   define __deprecated
 184 #   define __section(x)
 185 #endif
 186 #if __GNUC__ > 2
 187 #   define __deprecated    __attribute__((__deprecated__))
 188 #   define __section(x)    __attribute__((__section__(x)))
 189 #endif
 190
 191 #if __GNUC_PREREQ(3,3)
 192 #define __startup __section(".aros.startup") __used
 193 #else
 194 #define __startup __used
 195 #endif
 196
 197 /* 5. Calculated #defines */
 198 #if !AROS_STACK_GROWS_DOWNWARDS
 199 #   define AROS_SLOWSTACKTAGS
 200 #   define AROS_SLOWSTACKMETHODS
 201 #endif /* !AROS_STACK_GROWS_DOWNWARDS */
 202
 203 #if !defined(__CONCAT)
 204 #   if defined(__STDC__) || defined(__cplusplus)
 205 #       define      __CONCAT1(a,b)  a ## b
 206 #       define      __CONCAT(a,b)   __CONCAT1(a,b)
 207 #   else
 208 #       define      __CONCAT(a,b)       a/**/b
 209 #   endif
 210 #endif
 211
 212 #ifndef AROS_ASMSYMNAME
 213 #   define AROS_ASMSYMNAME(n) n
 214 #endif
 215
 216 #ifndef AROS_CSYM_FROM_ASM_NAME
 217 #   if defined(__ELF__) || defined(__MACH__) || defined(_WIN32) || defined(__CYGWIN__)
 218 #       define AROS_CSYM_FROM_ASM_NAME(n) n
 219 #   else
 220 #       error define AROS_CSYM_FROM_ASM_NAME for your architecture
 221 #   endif
 222 #endif
 223
 224 #define ___AROS_STR(x) #x
 225 #define __AROS_STR(x) ___AROS_STR(x)
 226
 227
 228 /* Makes a 'new' symbol which occupies the same memory location as the 'old' symbol */
 229 #if !defined AROS_MAKE_ALIAS
 230 #   define AROS_MAKE_ALIAS(old, new) \
 231         AROS_MAKE_ASM_SYM(typeof(old), new, AROS_CSYM_FROM_ASM_NAME(new), AROS_CSYM_FROM_ASM_NAME(old)); \
 232         AROS_EXPORT_ASM_SYM(AROS_CSYM_FROM_ASM_NAME(new))
 233 #endif
 234
 235 /* define an asm symbol 'asym' with a C name 'csym', type 'type' and with value 'value'.
 236    'value' has to be an asm constant, thus either an address number or an asm symbol name, */
 237 #if !defined AROS_MAKE_ASM_SYM
 238 #    define AROS_MAKE_ASM_SYM(type, csym, asym, value)             \
 239          extern type csym asm(__AROS_STR(asym));                   \
 240          typedef int __CONCAT(__you_must_first_make_asym_, asym);  \
 241          asm(".set " __AROS_STR(asym) ", " __AROS_STR(value) "\n")
 242 #endif
 243
 244 /* Makes an ASM symbol 'asym' available for use in the compilation unit this
 245    macro is used, with a C name 'csym'. This has also the side effect of
 246    triggering the inclusion, by the linker, of all code and data present in the
 247    module where the ASM symbol is actually defined.  */
 248 #if !defined AROS_IMPORT_ASM_SYM
 249 #    define AROS_IMPORT_ASM_SYM(type, csym, asym)     \
 250          extern type csym asm(__AROS_STR(asym));      \
 251          asm("\n.globl " __AROS_STR(asym) "\n")
 252 #endif
 253
 254 /* Make sure other compilation units can see the symbol 'asym' created with AROS_MAKE_ASM_SYM.
 255    This macro results in a compile-time error in case it's used BEFORE the symbol has been
 256    made with AROS_MAKE_ASM_SYM.  */
 257 #if !defined AROS_EXPORT_ASM_SYM
 258 #    define AROS_EXPORT_ASM_SYM(asym)                                    \
 259          struct __CONCAT(___you_must_first_make_asym_, asym)             \
 260          {                                                               \
 261              int a[sizeof(__CONCAT(__you_must_first_make_asym_, asym))]; \
 262          };                                                              \
 263          asm("\n.globl " __AROS_STR(asym) "\n")
 264 #endif
 265
 266 #endif /* AROS_SYSTEM_H */