src/mesa/main/compiler.h

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   5  * Copyright (C) 2009  VMware, Inc.  All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  21  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  22  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  23  * OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26
  27 /**
  28  * \file compiler.h
  29  * Compiler-related stuff.
  30  */
  31
  32
  33 #ifndef COMPILER_H
  34 #define COMPILER_H
  35
  36
  37 #include <assert.h>
  38 #include <ctype.h>
  39 #include <math.h>
  40 #include <limits.h>
  41 #include <stdlib.h>
  42 #include <stdio.h>
  43 #include <string.h>
  44 #include <float.h>
  45 #include <stdarg.h>
  46
  47 #include "util/macros.h"
  48
  49 #include "c99_compat.h" /* inline, __func__, etc. */
  50
  51
  52 #ifdef __cplusplus
  53 extern "C" {
  54 #endif
  55
  56
  57 /**
  58  * Get standard integer types
  59  */
  60 #include <stdint.h>
  61
  62
  63 /**
  64   * Sun compilers define __i386 instead of the gcc-style __i386__
  65  */
  66 #ifdef __SUNPRO_C
  67 # if !defined(__i386__) && defined(__i386)
  68 #  define __i386__
  69 # elif !defined(__amd64__) && defined(__amd64)
  70 #  define __amd64__
  71 # elif !defined(__sparc__) && defined(__sparc)
  72 #  define __sparc__
  73 # endif
  74 # if !defined(__volatile)
  75 #  define __volatile volatile
  76 # endif
  77 #endif
  78
  79
  80 /**
  81  * finite macro.
  82  */
  83 #if defined(_MSC_VER)
  84 #  define finite _finite
  85 #endif
  86
  87
  88 /**
  89  * Disable assorted warnings
  90  */
  91 #if defined(_WIN32) && !defined(__CYGWIN__)
  92 #  if !defined(__GNUC__) /* mingw environment */
  93 #    pragma warning( disable : 4068 ) /* unknown pragma */
  94 #    pragma warning( disable : 4710 ) /* function 'foo' not inlined */
  95 #    pragma warning( disable : 4711 ) /* function 'foo' selected for automatic inline expansion */
  96 #    pragma warning( disable : 4127 ) /* conditional expression is constant */
  97 #    if defined(MESA_MINWARN)
  98 #      pragma warning( disable : 4244 ) /* '=' : conversion from 'const double ' to 'float ', possible loss of data */
  99 #      pragma warning( disable : 4018 ) /* '<' : signed/unsigned mismatch */
 100 #      pragma warning( disable : 4305 ) /* '=' : truncation from 'const double ' to 'float ' */
 101 #      pragma warning( disable : 4550 ) /* 'function' undefined; assuming extern returning int */
 102 #      pragma warning( disable : 4761 ) /* integral size mismatch in argument; conversion supplied */
 103 #    endif
 104 #  endif
 105 #endif
 106
 107
 108
 109 /* XXX: Use standard `inline` keyword instead */
 110 #ifndef INLINE
 111 #  define INLINE inline
 112 #endif
 113
 114
 115 /**
 116  * PUBLIC/USED macros
 117  *
 118  * If we build the library with gcc's -fvisibility=hidden flag, we'll
 119  * use the PUBLIC macro to mark functions that are to be exported.
 120  *
 121  * We also need to define a USED attribute, so the optimizer doesn't
 122  * inline a static function that we later use in an alias. - ajax
 123  */
 124 #ifndef PUBLIC
 125 #  if defined(__GNUC__) || (defined(__SUNPRO_C) && (__SUNPRO_C >= 0x590))
 126 #    define PUBLIC __attribute__((visibility("default")))
 127 #    define USED __attribute__((used))
 128 #  else
 129 #    define PUBLIC
 130 #    define USED
 131 #  endif
 132 #endif
 133
 134
 135 /* XXX: Use standard `__func__` instead */
 136 #ifndef __FUNCTION__
 137 #  define __FUNCTION__ __func__
 138 #endif
 139
 140 /**
 141  * Either define MESA_BIG_ENDIAN or MESA_LITTLE_ENDIAN, and CPU_TO_LE32.
 142  * Do not use these unless absolutely necessary!
 143  * Try to use a runtime test instead.
 144  * For now, only used by some DRI hardware drivers for color/texel packing.
 145  */
 146 #if defined(BYTE_ORDER) && defined(BIG_ENDIAN) && BYTE_ORDER == BIG_ENDIAN
 147 #if defined(__linux__)
 148 #include <byteswap.h>
 149 #define CPU_TO_LE32( x )        bswap_32( x )
 150 #elif defined(__APPLE__)
 151 #include <CoreFoundation/CFByteOrder.h>
 152 #define CPU_TO_LE32( x )        CFSwapInt32HostToLittle( x )
 153 #elif (defined(_AIX))
 154 static inline GLuint CPU_TO_LE32(GLuint x)
 155 {
 156    return (((x & 0x000000ff) << 24) |
 157            ((x & 0x0000ff00) <<  8) |
 158            ((x & 0x00ff0000) >>  8) |
 159            ((x & 0xff000000) >> 24));
 160 }
 161 #elif defined(__OpenBSD__)
 162 #include <sys/types.h>
 163 #define CPU_TO_LE32( x )        htole32( x )
 164 #else /*__linux__ */
 165 #include <sys/endian.h>
 166 #define CPU_TO_LE32( x )        bswap32( x )
 167 #endif /*__linux__*/
 168 #define MESA_BIG_ENDIAN 1
 169 #else
 170 #define CPU_TO_LE32( x )        ( x )
 171 #define MESA_LITTLE_ENDIAN 1
 172 #endif
 173 #define LE32_TO_CPU( x )        CPU_TO_LE32( x )
 174
 175
 176
 177 /**
 178  * Create a macro so that asm functions can be linked into compilers other
 179  * than GNU C
 180  */
 181 #ifndef _ASMAPI
 182 #if defined(_WIN32)
 183 #define _ASMAPI __cdecl
 184 #else
 185 #define _ASMAPI
 186 #endif
 187 #ifdef  PTR_DECL_IN_FRONT
 188 #define _ASMAPIP * _ASMAPI
 189 #else
 190 #define _ASMAPIP _ASMAPI *
 191 #endif
 192 #endif
 193
 194 #ifdef USE_X86_ASM
 195 #define _NORMAPI _ASMAPI
 196 #define _NORMAPIP _ASMAPIP
 197 #else
 198 #define _NORMAPI
 199 #define _NORMAPIP *
 200 #endif
 201
 202
 203 /**
 204  * ASSERT macro
 205  */
 206 #if defined(DEBUG)
 207 #  define ASSERT(X)   assert(X)
 208 #else
 209 #  define ASSERT(X)
 210 #endif
 211
 212
 213 /*
 214  * A trick to suppress uninitialized variable warning without generating any
 215  * code
 216  */
 217 #define uninitialized_var(x) x = x
 218
 219 #ifndef NULL
 220 #define NULL 0
 221 #endif
 222
 223
 224 /**
 225  * LONGSTRING macro
 226  * gcc -pedantic warns about long string literals, LONGSTRING silences that.
 227  */
 228 #if !defined(__GNUC__)
 229 # define LONGSTRING
 230 #else
 231 # define LONGSTRING __extension__
 232 #endif
 233
 234
 235 #ifndef M_PI
 236 #define M_PI (3.14159265358979323846)
 237 #endif
 238
 239 #ifndef M_E
 240 #define M_E (2.7182818284590452354)
 241 #endif
 242
 243 #ifndef M_LOG2E
 244 #define M_LOG2E     (1.4426950408889634074)
 245 #endif
 246
 247 #ifndef ONE_DIV_SQRT_LN2
 248 #define ONE_DIV_SQRT_LN2 (1.201122408786449815)
 249 #endif
 250
 251 #ifndef FLT_MAX_EXP
 252 #define FLT_MAX_EXP 128
 253 #endif
 254
 255 #define IEEE_ONE 0x3f800000
 256
 257 /**
 258  * START/END_FAST_MATH macros:
 259  *
 260  * START_FAST_MATH: Set x86 FPU to faster, 32-bit precision mode (and save
 261  *                  original mode to a temporary).
 262  * END_FAST_MATH: Restore x86 FPU to original mode.
 263  */
 264 #if defined(__GNUC__) && defined(__i386__)
 265 /*
 266  * Set the x86 FPU control word to guarentee only 32 bits of precision
 267  * are stored in registers.  Allowing the FPU to store more introduces
 268  * differences between situations where numbers are pulled out of memory
 269  * vs. situations where the compiler is able to optimize register usage.
 270  *
 271  * In the worst case, we force the compiler to use a memory access to
 272  * truncate the float, by specifying the 'volatile' keyword.
 273  */
 274 /* Hardware default: All exceptions masked, extended double precision,
 275  * round to nearest (IEEE compliant):
 276  */
 277 #define DEFAULT_X86_FPU         0x037f
 278 /* All exceptions masked, single precision, round to nearest:
 279  */
 280 #define FAST_X86_FPU            0x003f
 281 /* The fldcw instruction will cause any pending FP exceptions to be
 282  * raised prior to entering the block, and we clear any pending
 283  * exceptions before exiting the block.  Hence, asm code has free
 284  * reign over the FPU while in the fast math block.
 285  */
 286 #if defined(NO_FAST_MATH)
 287 #define START_FAST_MATH(x)                                              \
 288 do {                                                                    \
 289    static GLuint mask = DEFAULT_X86_FPU;                                \
 290    __asm__ ( "fnstcw %0" : "=m" (*&(x)) );                              \
 291    __asm__ ( "fldcw %0" : : "m" (mask) );                               \
 292 } while (0)
 293 #else
 294 #define START_FAST_MATH(x)                                              \
 295 do {                                                                    \
 296    static GLuint mask = FAST_X86_FPU;                                   \
 297    __asm__ ( "fnstcw %0" : "=m" (*&(x)) );                              \
 298    __asm__ ( "fldcw %0" : : "m" (mask) );                               \
 299 } while (0)
 300 #endif
 301 /* Restore original FPU mode, and clear any exceptions that may have
 302  * occurred in the FAST_MATH block.
 303  */
 304 #define END_FAST_MATH(x)                                                \
 305 do {                                                                    \
 306    __asm__ ( "fnclex ; fldcw %0" : : "m" (*&(x)) );                     \
 307 } while (0)
 308
 309 #elif defined(_MSC_VER) && defined(_M_IX86)
 310 #define DEFAULT_X86_FPU         0x037f /* See GCC comments above */
 311 #define FAST_X86_FPU            0x003f /* See GCC comments above */
 312 #if defined(NO_FAST_MATH)
 313 #define START_FAST_MATH(x) do {\
 314         static GLuint mask = DEFAULT_X86_FPU;\
 315         __asm fnstcw word ptr [x]\
 316         __asm fldcw word ptr [mask]\
 317 } while(0)
 318 #else
 319 #define START_FAST_MATH(x) do {\
 320         static GLuint mask = FAST_X86_FPU;\
 321         __asm fnstcw word ptr [x]\
 322         __asm fldcw word ptr [mask]\
 323 } while(0)
 324 #endif
 325 #define END_FAST_MATH(x) do {\
 326         __asm fnclex\
 327         __asm fldcw word ptr [x]\
 328 } while(0)
 329
 330 #else
 331 #define START_FAST_MATH(x)  x = 0
 332 #define END_FAST_MATH(x)  (void)(x)
 333 #endif
 334
 335
 336 #ifndef Elements
 337 #define Elements(x) (sizeof(x)/sizeof(*(x)))
 338 #endif
 339
 340 #ifdef __cplusplus
 341 }
 342 #endif
 343
 344
 345 #endif /* COMPILER_H */