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  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. #if defined(__alpha__) && defined(CCPML)
  40. #include <cpml.h> /* use Compaq's Fast Math Library on Alpha */
  41. #else
  42. #include <math.h>
  43. #endif
  44. #include <limits.h>
  45. #include <stdlib.h>
  46. #include <stdio.h>
  47. #include <string.h>
  48. #include <float.h>
  49. #include <stdarg.h>
  50.  
  51. #include "c99_compat.h" /* inline, __func__, etc. */
  52.  
  53.  
  54. #ifdef __cplusplus
  55. extern "C" {
  56. #endif
  57.  
  58.  
  59. /**
  60.  * Get standard integer types
  61.  */
  62. #include <stdint.h>
  63.  
  64.  
  65. /**
  66.   * Sun compilers define __i386 instead of the gcc-style __i386__
  67.  */
  68. #ifdef __SUNPRO_C
  69. # if !defined(__i386__) && defined(__i386)
  70. #  define __i386__
  71. # elif !defined(__amd64__) && defined(__amd64)
  72. #  define __amd64__
  73. # elif !defined(__sparc__) && defined(__sparc)
  74. #  define __sparc__
  75. # endif
  76. # if !defined(__volatile)
  77. #  define __volatile volatile
  78. # endif
  79. #endif
  80.  
  81.  
  82. /**
  83.  * finite macro.
  84.  */
  85. #if defined(_MSC_VER)
  86. #  define finite _finite
  87. #elif defined(__WATCOMC__)
  88. #  define finite _finite
  89. #endif
  90.  
  91.  
  92. /**
  93.  * Disable assorted warnings
  94.  */
  95. #if !defined(OPENSTEP) && (defined(_WIN32) && !defined(__CYGWIN__)) && !defined(BUILD_FOR_SNAP)
  96. #  if !defined(__GNUC__) /* mingw environment */
  97. #    pragma warning( disable : 4068 ) /* unknown pragma */
  98. #    pragma warning( disable : 4710 ) /* function 'foo' not inlined */
  99. #    pragma warning( disable : 4711 ) /* function 'foo' selected for automatic inline expansion */
  100. #    pragma warning( disable : 4127 ) /* conditional expression is constant */
  101. #    if defined(MESA_MINWARN)
  102. #      pragma warning( disable : 4244 ) /* '=' : conversion from 'const double ' to 'float ', possible loss of data */
  103. #      pragma warning( disable : 4018 ) /* '<' : signed/unsigned mismatch */
  104. #      pragma warning( disable : 4305 ) /* '=' : truncation from 'const double ' to 'float ' */
  105. #      pragma warning( disable : 4550 ) /* 'function' undefined; assuming extern returning int */
  106. #      pragma warning( disable : 4761 ) /* integral size mismatch in argument; conversion supplied */
  107. #    endif
  108. #  endif
  109. #endif
  110. #if defined(__WATCOMC__)
  111. #  pragma disable_message(201) /* Disable unreachable code warnings */
  112. #endif
  113.  
  114.  
  115.  
  116. /* XXX: Use standard `inline` keyword instead */
  117. #ifndef INLINE
  118. #  define INLINE inline
  119. #endif
  120.  
  121.  
  122. /**
  123.  * PUBLIC/USED macros
  124.  *
  125.  * If we build the library with gcc's -fvisibility=hidden flag, we'll
  126.  * use the PUBLIC macro to mark functions that are to be exported.
  127.  *
  128.  * We also need to define a USED attribute, so the optimizer doesn't
  129.  * inline a static function that we later use in an alias. - ajax
  130.  */
  131. #ifndef PUBLIC
  132. #  if (defined(__GNUC__) && __GNUC__ >= 4) || (defined(__SUNPRO_C) && (__SUNPRO_C >= 0x590))
  133. #    define PUBLIC __attribute__((visibility("default")))
  134. #    define USED __attribute__((used))
  135. #  else
  136. #    define PUBLIC
  137. #    define USED
  138. #  endif
  139. #endif
  140.  
  141.  
  142. /**
  143.  * __builtin_expect macros
  144.  */
  145. #if !defined(__GNUC__)
  146. #  define __builtin_expect(x, y) (x)
  147. #endif
  148.  
  149. #ifndef likely
  150. #  ifdef __GNUC__
  151. #    define likely(x)   __builtin_expect(!!(x), 1)
  152. #    define unlikely(x) __builtin_expect(!!(x), 0)
  153. #  else
  154. #    define likely(x)   (x)
  155. #    define unlikely(x) (x)
  156. #  endif
  157. #endif
  158.  
  159. /* XXX: Use standard `__func__` instead */
  160. #ifndef __FUNCTION__
  161. #  define __FUNCTION__ __func__
  162. #endif
  163.  
  164. /**
  165.  * Either define MESA_BIG_ENDIAN or MESA_LITTLE_ENDIAN, and CPU_TO_LE32.
  166.  * Do not use these unless absolutely necessary!
  167.  * Try to use a runtime test instead.
  168.  * For now, only used by some DRI hardware drivers for color/texel packing.
  169.  */
  170. #if defined(BYTE_ORDER) && defined(BIG_ENDIAN) && BYTE_ORDER == BIG_ENDIAN
  171. #if defined(__linux__)
  172. #include <byteswap.h>
  173. #define CPU_TO_LE32( x )        bswap_32( x )
  174. #elif defined(__APPLE__)
  175. #include <CoreFoundation/CFByteOrder.h>
  176. #define CPU_TO_LE32( x )        CFSwapInt32HostToLittle( x )
  177. #elif (defined(_AIX) || defined(__blrts))
  178. static INLINE GLuint CPU_TO_LE32(GLuint x)
  179. {
  180.    return (((x & 0x000000ff) << 24) |
  181.            ((x & 0x0000ff00) <<  8) |
  182.            ((x & 0x00ff0000) >>  8) |
  183.            ((x & 0xff000000) >> 24));
  184. }
  185. #elif defined(__OpenBSD__)
  186. #include <sys/types.h>
  187. #define CPU_TO_LE32( x )        htole32( x )
  188. #else /*__linux__ */
  189. #include <sys/endian.h>
  190. #define CPU_TO_LE32( x )        bswap32( x )
  191. #endif /*__linux__*/
  192. #define MESA_BIG_ENDIAN 1
  193. #else
  194. #define CPU_TO_LE32( x )        ( x )
  195. #define MESA_LITTLE_ENDIAN 1
  196. #endif
  197. #define LE32_TO_CPU( x )        CPU_TO_LE32( x )
  198.  
  199.  
  200.  
  201. #if !defined(CAPI) && defined(_WIN32) && !defined(BUILD_FOR_SNAP)
  202. #define CAPI _cdecl
  203. #endif
  204.  
  205.  
  206. /**
  207.  * Create a macro so that asm functions can be linked into compilers other
  208.  * than GNU C
  209.  */
  210. #ifndef _ASMAPI
  211. #if defined(_WIN32) && !defined(BUILD_FOR_SNAP)/* was: !defined( __GNUC__ ) && !defined( VMS ) && !defined( __INTEL_COMPILER )*/
  212. #define _ASMAPI __cdecl
  213. #else
  214. #define _ASMAPI
  215. #endif
  216. #ifdef  PTR_DECL_IN_FRONT
  217. #define _ASMAPIP * _ASMAPI
  218. #else
  219. #define _ASMAPIP _ASMAPI *
  220. #endif
  221. #endif
  222.  
  223. #ifdef USE_X86_ASM
  224. #define _NORMAPI _ASMAPI
  225. #define _NORMAPIP _ASMAPIP
  226. #else
  227. #define _NORMAPI
  228. #define _NORMAPIP *
  229. #endif
  230.  
  231.  
  232. /* Turn off macro checking systems used by other libraries */
  233. #ifdef CHECK
  234. #undef CHECK
  235. #endif
  236.  
  237.  
  238. /**
  239.  * ASSERT macro
  240.  */
  241. #if !defined(_WIN32_WCE)
  242. #if defined(BUILD_FOR_SNAP) && defined(CHECKED)
  243. #  define ASSERT(X)   _CHECK(X)
  244. #elif defined(DEBUG)
  245. #  define ASSERT(X)   assert(X)
  246. #else
  247. #  define ASSERT(X)
  248. #endif
  249. #endif
  250.  
  251.  
  252. /**
  253.  * Static (compile-time) assertion.
  254.  * Basically, use COND to dimension an array.  If COND is false/zero the
  255.  * array size will be -1 and we'll get a compilation error.
  256.  */
  257. #define STATIC_ASSERT(COND) \
  258.    do { \
  259.       (void) sizeof(char [1 - 2*!(COND)]); \
  260.    } while (0)
  261.  
  262.  
  263. #if (__GNUC__ >= 3)
  264. #define PRINTFLIKE(f, a) __attribute__ ((format(__printf__, f, a)))
  265. #else
  266. #define PRINTFLIKE(f, a)
  267. #endif
  268.  
  269. #ifndef NULL
  270. #define NULL 0
  271. #endif
  272.  
  273.  
  274. /**
  275.  * LONGSTRING macro
  276.  * gcc -pedantic warns about long string literals, LONGSTRING silences that.
  277.  */
  278. #if !defined(__GNUC__)
  279. # define LONGSTRING
  280. #else
  281. # define LONGSTRING __extension__
  282. #endif
  283.  
  284.  
  285. #ifndef M_PI
  286. #define M_PI (3.14159265358979323846)
  287. #endif
  288.  
  289. #ifndef M_E
  290. #define M_E (2.7182818284590452354)
  291. #endif
  292.  
  293. #ifndef M_LOG2E
  294. #define M_LOG2E     (1.4426950408889634074)
  295. #endif
  296.  
  297. #ifndef ONE_DIV_SQRT_LN2
  298. #define ONE_DIV_SQRT_LN2 (1.201122408786449815)
  299. #endif
  300.  
  301. #ifndef FLT_MAX_EXP
  302. #define FLT_MAX_EXP 128
  303. #endif
  304.  
  305.  
  306. /**
  307.  * USE_IEEE: Determine if we're using IEEE floating point
  308.  */
  309. #if defined(__i386__) || defined(__386__) || defined(__sparc__) || \
  310.     defined(__s390__) || defined(__s390x__) || defined(__powerpc__) || \
  311.     defined(__x86_64__) || \
  312.     defined(__m68k__) || \
  313.     defined(ia64) || defined(__ia64__) || \
  314.     defined(__hppa__) || defined(hpux) || \
  315.     defined(__mips) || defined(_MIPS_ARCH) || \
  316.     defined(__arm__) || \
  317.     defined(__sh__) || defined(__m32r__) || \
  318.     (defined(__sun) && defined(_IEEE_754)) || \
  319.     defined(__alpha__)
  320. #define USE_IEEE
  321. #define IEEE_ONE 0x3f800000
  322. #endif
  323.  
  324.  
  325. /**
  326.  * START/END_FAST_MATH macros:
  327.  *
  328.  * START_FAST_MATH: Set x86 FPU to faster, 32-bit precision mode (and save
  329.  *                  original mode to a temporary).
  330.  * END_FAST_MATH: Restore x86 FPU to original mode.
  331.  */
  332. #if defined(__GNUC__) && defined(__i386__)
  333. /*
  334.  * Set the x86 FPU control word to guarentee only 32 bits of precision
  335.  * are stored in registers.  Allowing the FPU to store more introduces
  336.  * differences between situations where numbers are pulled out of memory
  337.  * vs. situations where the compiler is able to optimize register usage.
  338.  *
  339.  * In the worst case, we force the compiler to use a memory access to
  340.  * truncate the float, by specifying the 'volatile' keyword.
  341.  */
  342. /* Hardware default: All exceptions masked, extended double precision,
  343.  * round to nearest (IEEE compliant):
  344.  */
  345. #define DEFAULT_X86_FPU         0x037f
  346. /* All exceptions masked, single precision, round to nearest:
  347.  */
  348. #define FAST_X86_FPU            0x003f
  349. /* The fldcw instruction will cause any pending FP exceptions to be
  350.  * raised prior to entering the block, and we clear any pending
  351.  * exceptions before exiting the block.  Hence, asm code has free
  352.  * reign over the FPU while in the fast math block.
  353.  */
  354. #if defined(NO_FAST_MATH)
  355. #define START_FAST_MATH(x)                                              \
  356. do {                                                                    \
  357.    static GLuint mask = DEFAULT_X86_FPU;                                \
  358.    __asm__ ( "fnstcw %0" : "=m" (*&(x)) );                              \
  359.    __asm__ ( "fldcw %0" : : "m" (mask) );                               \
  360. } while (0)
  361. #else
  362. #define START_FAST_MATH(x)                                              \
  363. do {                                                                    \
  364.    static GLuint mask = FAST_X86_FPU;                                   \
  365.    __asm__ ( "fnstcw %0" : "=m" (*&(x)) );                              \
  366.    __asm__ ( "fldcw %0" : : "m" (mask) );                               \
  367. } while (0)
  368. #endif
  369. /* Restore original FPU mode, and clear any exceptions that may have
  370.  * occurred in the FAST_MATH block.
  371.  */
  372. #define END_FAST_MATH(x)                                                \
  373. do {                                                                    \
  374.    __asm__ ( "fnclex ; fldcw %0" : : "m" (*&(x)) );                     \
  375. } while (0)
  376.  
  377. #elif defined(__WATCOMC__) && defined(__386__)
  378. #define DEFAULT_X86_FPU         0x037f /* See GCC comments above */
  379. #define FAST_X86_FPU            0x003f /* See GCC comments above */
  380. void _watcom_start_fast_math(unsigned short *x,unsigned short *mask);
  381. #pragma aux _watcom_start_fast_math =                                   \
  382.    "fnstcw  word ptr [eax]"                                             \
  383.    "fldcw   word ptr [ecx]"                                             \
  384.    parm [eax] [ecx]                                                     \
  385.    modify exact [];
  386. void _watcom_end_fast_math(unsigned short *x);
  387. #pragma aux _watcom_end_fast_math =                                     \
  388.    "fnclex"                                                             \
  389.    "fldcw   word ptr [eax]"                                             \
  390.    parm [eax]                                                           \
  391.    modify exact [];
  392. #if defined(NO_FAST_MATH)
  393. #define START_FAST_MATH(x)                                              \
  394. do {                                                                    \
  395.    static GLushort mask = DEFAULT_X86_FPU;                              \
  396.    _watcom_start_fast_math(&x,&mask);                                   \
  397. } while (0)
  398. #else
  399. #define START_FAST_MATH(x)                                              \
  400. do {                                                                    \
  401.    static GLushort mask = FAST_X86_FPU;                                 \
  402.    _watcom_start_fast_math(&x,&mask);                                   \
  403. } while (0)
  404. #endif
  405. #define END_FAST_MATH(x)  _watcom_end_fast_math(&x)
  406.  
  407. #elif defined(_MSC_VER) && defined(_M_IX86)
  408. #define DEFAULT_X86_FPU         0x037f /* See GCC comments above */
  409. #define FAST_X86_FPU            0x003f /* See GCC comments above */
  410. #if defined(NO_FAST_MATH)
  411. #define START_FAST_MATH(x) do {\
  412.         static GLuint mask = DEFAULT_X86_FPU;\
  413.         __asm fnstcw word ptr [x]\
  414.         __asm fldcw word ptr [mask]\
  415. } while(0)
  416. #else
  417. #define START_FAST_MATH(x) do {\
  418.         static GLuint mask = FAST_X86_FPU;\
  419.         __asm fnstcw word ptr [x]\
  420.         __asm fldcw word ptr [mask]\
  421. } while(0)
  422. #endif
  423. #define END_FAST_MATH(x) do {\
  424.         __asm fnclex\
  425.         __asm fldcw word ptr [x]\
  426. } while(0)
  427.  
  428. #else
  429. #define START_FAST_MATH(x)  x = 0
  430. #define END_FAST_MATH(x)  (void)(x)
  431. #endif
  432.  
  433.  
  434. #ifndef Elements
  435. #define Elements(x) (sizeof(x)/sizeof(*(x)))
  436. #endif
  437.  
  438.  
  439.  
  440. #ifdef __cplusplus
  441. }
  442. #endif
  443.  
  444.  
  445. #endif /* COMPILER_H */
  446.