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 #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 /* Used to optionally mark structures with misaligned elements or size as
 274  * packed, to trade off performance for space.
 275  */
 276 #if (__GNUC__ >= 3)
 277 #define PACKED __attribute__((__packed__))
 278 #else
 279 #define PACKED
 280 #endif
 281
 282
 283 /**
 284  * LONGSTRING macro
 285  * gcc -pedantic warns about long string literals, LONGSTRING silences that.
 286  */
 287 #if !defined(__GNUC__)
 288 # define LONGSTRING
 289 #else
 290 # define LONGSTRING __extension__
 291 #endif
 292
 293
 294 #ifndef M_PI
 295 #define M_PI (3.14159265358979323846)
 296 #endif
 297
 298 #ifndef M_E
 299 #define M_E (2.7182818284590452354)
 300 #endif
 301
 302 #ifndef M_LOG2E
 303 #define M_LOG2E     (1.4426950408889634074)
 304 #endif
 305
 306 #ifndef ONE_DIV_SQRT_LN2
 307 #define ONE_DIV_SQRT_LN2 (1.201122408786449815)
 308 #endif
 309
 310 #ifndef FLT_MAX_EXP
 311 #define FLT_MAX_EXP 128
 312 #endif
 313
 314
 315 /**
 316  * USE_IEEE: Determine if we're using IEEE floating point
 317  */
 318 #if defined(__i386__) || defined(__386__) || defined(__sparc__) || \
 319     defined(__s390__) || defined(__s390x__) || defined(__powerpc__) || \
 320     defined(__x86_64__) || \
 321     defined(__m68k__) || \
 322     defined(ia64) || defined(__ia64__) || \
 323     defined(__hppa__) || defined(hpux) || \
 324     defined(__mips) || defined(_MIPS_ARCH) || \
 325     defined(__arm__) || \
 326     defined(__sh__) || defined(__m32r__) || \
 327     (defined(__sun) && defined(_IEEE_754)) || \
 328     defined(__alpha__)
 329 #define USE_IEEE
 330 #define IEEE_ONE 0x3f800000
 331 #endif
 332
 333
 334 /**
 335  * START/END_FAST_MATH macros:
 336  *
 337  * START_FAST_MATH: Set x86 FPU to faster, 32-bit precision mode (and save
 338  *                  original mode to a temporary).
 339  * END_FAST_MATH: Restore x86 FPU to original mode.
 340  */
 341 #if defined(__GNUC__) && defined(__i386__)
 342 /*
 343  * Set the x86 FPU control word to guarentee only 32 bits of precision
 344  * are stored in registers.  Allowing the FPU to store more introduces
 345  * differences between situations where numbers are pulled out of memory
 346  * vs. situations where the compiler is able to optimize register usage.
 347  *
 348  * In the worst case, we force the compiler to use a memory access to
 349  * truncate the float, by specifying the 'volatile' keyword.
 350  */
 351 /* Hardware default: All exceptions masked, extended double precision,
 352  * round to nearest (IEEE compliant):
 353  */
 354 #define DEFAULT_X86_FPU         0x037f
 355 /* All exceptions masked, single precision, round to nearest:
 356  */
 357 #define FAST_X86_FPU            0x003f
 358 /* The fldcw instruction will cause any pending FP exceptions to be
 359  * raised prior to entering the block, and we clear any pending
 360  * exceptions before exiting the block.  Hence, asm code has free
 361  * reign over the FPU while in the fast math block.
 362  */
 363 #if defined(NO_FAST_MATH)
 364 #define START_FAST_MATH(x)                                              \
 365 do {                                                                    \
 366    static GLuint mask = DEFAULT_X86_FPU;                                \
 367    __asm__ ( "fnstcw %0" : "=m" (*&(x)) );                              \
 368    __asm__ ( "fldcw %0" : : "m" (mask) );                               \
 369 } while (0)
 370 #else
 371 #define START_FAST_MATH(x)                                              \
 372 do {                                                                    \
 373    static GLuint mask = FAST_X86_FPU;                                   \
 374    __asm__ ( "fnstcw %0" : "=m" (*&(x)) );                              \
 375    __asm__ ( "fldcw %0" : : "m" (mask) );                               \
 376 } while (0)
 377 #endif
 378 /* Restore original FPU mode, and clear any exceptions that may have
 379  * occurred in the FAST_MATH block.
 380  */
 381 #define END_FAST_MATH(x)                                                \
 382 do {                                                                    \
 383    __asm__ ( "fnclex ; fldcw %0" : : "m" (*&(x)) );                     \
 384 } while (0)
 385
 386 #elif defined(__WATCOMC__) && defined(__386__)
 387 #define DEFAULT_X86_FPU         0x037f /* See GCC comments above */
 388 #define FAST_X86_FPU            0x003f /* See GCC comments above */
 389 void _watcom_start_fast_math(unsigned short *x,unsigned short *mask);
 390 #pragma aux _watcom_start_fast_math =                                   \
 391    "fnstcw  word ptr [eax]"                                             \
 392    "fldcw   word ptr [ecx]"                                             \
 393    parm [eax] [ecx]                                                     \
 394    modify exact [];
 395 void _watcom_end_fast_math(unsigned short *x);
 396 #pragma aux _watcom_end_fast_math =                                     \
 397    "fnclex"                                                             \
 398    "fldcw   word ptr [eax]"                                             \
 399    parm [eax]                                                           \
 400    modify exact [];
 401 #if defined(NO_FAST_MATH)
 402 #define START_FAST_MATH(x)                                              \
 403 do {                                                                    \
 404    static GLushort mask = DEFAULT_X86_FPU;                              \
 405    _watcom_start_fast_math(&x,&mask);                                   \
 406 } while (0)
 407 #else
 408 #define START_FAST_MATH(x)                                              \
 409 do {                                                                    \
 410    static GLushort mask = FAST_X86_FPU;                                 \
 411    _watcom_start_fast_math(&x,&mask);                                   \
 412 } while (0)
 413 #endif
 414 #define END_FAST_MATH(x)  _watcom_end_fast_math(&x)
 415
 416 #elif defined(_MSC_VER) && defined(_M_IX86)
 417 #define DEFAULT_X86_FPU         0x037f /* See GCC comments above */
 418 #define FAST_X86_FPU            0x003f /* See GCC comments above */
 419 #if defined(NO_FAST_MATH)
 420 #define START_FAST_MATH(x) do {\
 421         static GLuint mask = DEFAULT_X86_FPU;\
 422         __asm fnstcw word ptr [x]\
 423         __asm fldcw word ptr [mask]\
 424 } while(0)
 425 #else
 426 #define START_FAST_MATH(x) do {\
 427         static GLuint mask = FAST_X86_FPU;\
 428         __asm fnstcw word ptr [x]\
 429         __asm fldcw word ptr [mask]\
 430 } while(0)
 431 #endif
 432 #define END_FAST_MATH(x) do {\
 433         __asm fnclex\
 434         __asm fldcw word ptr [x]\
 435 } while(0)
 436
 437 #else
 438 #define START_FAST_MATH(x)  x = 0
 439 #define END_FAST_MATH(x)  (void)(x)
 440 #endif
 441
 442
 443 #ifndef Elements
 444 #define Elements(x) (sizeof(x)/sizeof(*(x)))
 445 #endif
 446
 447 #ifdef __cplusplus
 448 /**
 449  * Macro function that evaluates to true if T is a trivially
 450  * destructible type -- that is, if its (non-virtual) destructor
 451  * performs no action and all member variables and base classes are
 452  * trivially destructible themselves.
 453  */
 454 #   if defined(__GNUC__)
 455 #      if ((__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 3)))
 456 #         define HAS_TRIVIAL_DESTRUCTOR(T) __has_trivial_destructor(T)
 457 #      endif
 458 #   elif (defined(__clang__) && defined(__has_feature))
 459 #      if __has_feature(has_trivial_destructor)
 460 #         define HAS_TRIVIAL_DESTRUCTOR(T) __has_trivial_destructor(T)
 461 #      endif
 462 #   endif
 463 #   ifndef HAS_TRIVIAL_DESTRUCTOR
 464        /* It's always safe (if inefficient) to assume that a
 465         * destructor is non-trivial.
 466         */
 467 #      define HAS_TRIVIAL_DESTRUCTOR(T) (false)
 468 #   endif
 469 #endif
 470
 471 #ifdef __cplusplus
 472 }
 473 #endif
 474
 475
 476 #endif /* COMPILER_H */