code.delx.au - pulseaudio/blob - src/pulsecore/macro.h

   1 #ifndef foopulsemacrohfoo
   2 #define foopulsemacrohfoo
   3
   4 /***
   5   This file is part of PulseAudio.
   6
   7   Copyright 2004-2006 Lennart Poettering
   8
   9   PulseAudio is free software; you can redistribute it and/or modify
  10   it under the terms of the GNU Lesser General Public License as published
  11   by the Free Software Foundation; either version 2.1 of the License,
  12   or (at your option) any later version.
  13
  14   PulseAudio is distributed in the hope that it will be useful, but
  15   WITHOUT ANY WARRANTY; without even the implied warranty of
  16   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  17   General Public License for more details.
  18
  19   You should have received a copy of the GNU Lesser General Public License
  20   along with PulseAudio; if not, write to the Free Software
  21   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  22   USA.
  23 ***/
  24
  25 #include <sys/types.h>
  26 #include <unistd.h>
  27 #include <assert.h>
  28 #include <limits.h>
  29 #include <unistd.h>
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32
  33 #include <pulse/gccmacro.h>
  34
  35 #ifndef PACKAGE
  36 #error "Please include config.h before including this file!"
  37 #endif
  38
  39 #ifndef PA_LIKELY
  40 #ifdef __GNUC__
  41 #define PA_LIKELY(x) (__builtin_expect(!!(x),1))
  42 #define PA_UNLIKELY(x) (__builtin_expect(!!(x),0))
  43 #else
  44 #define PA_LIKELY(x) (x)
  45 #define PA_UNLIKELY(x) (x)
  46 #endif
  47 #endif
  48
  49 #if defined(PAGE_SIZE)
  50 #define PA_PAGE_SIZE ((size_t) PAGE_SIZE)
  51 #elif defined(PAGESIZE)
  52 #define PA_PAGE_SIZE ((size_t) PAGESIZE)
  53 #elif defined(HAVE_SYSCONF)
  54 #define PA_PAGE_SIZE ((size_t) (sysconf(_SC_PAGE_SIZE)))
  55 #else
  56 /* Let's hope it's like x86. */
  57 #define PA_PAGE_SIZE ((size_t) 4096)
  58 #endif
  59
  60 /* Rounds down */
  61 static inline void* pa_align_ptr(const void *p) {
  62     return (void*) (((size_t) p) & ~(sizeof(void*)-1));
  63 }
  64 #define PA_ALIGN_PTR(x) (pa_align_ptr(x))
  65
  66 /* Rounds up */
  67 static inline size_t pa_align(size_t l) {
  68     return (((l + sizeof(void*) - 1) / sizeof(void*)) * sizeof(void*));
  69 }
  70 #define PA_ALIGN(x) (pa_align(x))
  71
  72 /* Rounds down */
  73 static inline void* pa_page_align_ptr(const void *p) {
  74     return (void*) (((size_t) p) & ~(PA_PAGE_SIZE-1));
  75 }
  76 #define PA_PAGE_ALIGN_PTR(x) (pa_page_align_ptr(x))
  77
  78 static inline size_t pa_page_align(size_t l) {
  79     return l & ~(PA_PAGE_SIZE-1);
  80 }
  81 #define PA_PAGE_ALIGN(x) (pa_page_align(x))
  82
  83 #define PA_ELEMENTSOF(x) (sizeof(x)/sizeof((x)[0]))
  84
  85 /* The users of PA_MIN and PA_MAX should be aware that these macros on
  86  * non-GCC executed code with side effects twice. It is thus
  87  * considered misuse to use code with side effects as arguments to MIN
  88  * and MAX. */
  89
  90 #ifdef __GNUC__
  91 #define PA_MAX(a,b)                             \
  92     __extension__ ({ typeof(a) _a = (a);        \
  93             typeof(b) _b = (b);                 \
  94             _a > _b ? _a : _b;                  \
  95         })
  96 #else
  97 #define PA_MAX(a, b) ((a) > (b) ? (a) : (b))
  98 #endif
  99
 100 #ifdef __GNUC__
 101 #define PA_MIN(a,b)                             \
 102     __extension__ ({ typeof(a) _a = (a);        \
 103             typeof(b) _b = (b);                 \
 104             _a < _b ? _a : _b;                  \
 105         })
 106 #else
 107 #define PA_MIN(a, b) ((a) < (b) ? (a) : (b))
 108 #endif
 109
 110 #ifdef __GNUC__
 111 #define PA_CLAMP(x, low, high)                                          \
 112     __extension__ ({ typeof(x) _x = (x);                                \
 113             typeof(low) _low = (low);                                   \
 114             typeof(high) _high = (high);                                \
 115             ((_x > _high) ? _high : ((_x < _low) ? _low : _x));         \
 116         })
 117 #else
 118 #define PA_CLAMP(x, low, high) (((x) > (high)) ? (high) : (((x) < (low)) ? (low) : (x)))
 119 #endif
 120
 121 #ifdef __GNUC__
 122 #define PA_CLAMP_UNLIKELY(x, low, high)                                 \
 123     __extension__ ({ typeof(x) _x = (x);                                \
 124             typeof(low) _low = (low);                                   \
 125             typeof(high) _high = (high);                                \
 126             (PA_UNLIKELY(_x > _high) ? _high : (PA_UNLIKELY(_x < _low) ? _low : _x)); \
 127         })
 128 #else
 129 #define PA_CLAMP_UNLIKELY(x, low, high) (PA_UNLIKELY((x) > (high)) ? (high) : (PA_UNLIKELY((x) < (low)) ? (low) : (x)))
 130 #endif
 131
 132 /* We don't define a PA_CLAMP_LIKELY here, because it doesn't really
 133  * make sense: we cannot know if it is more likely that the values is
 134  * lower or greater than the boundaries.*/
 135
 136 /* This type is not intended to be used in exported APIs! Use classic "int" there! */
 137 #ifdef HAVE_STD_BOOL
 138 typedef _Bool pa_bool_t;
 139 #else
 140 typedef int pa_bool_t;
 141 #endif
 142
 143 #ifndef FALSE
 144 #define FALSE ((pa_bool_t) 0)
 145 #endif
 146
 147 #ifndef TRUE
 148 #define TRUE (!FALSE)
 149 #endif
 150
 151 #ifdef __GNUC__
 152 #define PA_PRETTY_FUNCTION __PRETTY_FUNCTION__
 153 #else
 154 #define PA_PRETTY_FUNCTION ""
 155 #endif
 156
 157 #define pa_return_if_fail(expr)                                         \
 158     do {                                                                \
 159         if (PA_UNLIKELY(!(expr))) {                                     \
 160             pa_log_debug("Assertion '%s' failed at %s:%u, function %s.\n", #expr , __FILE__, __LINE__, PA_PRETTY_FUNCTION); \
 161             return;                                                     \
 162         }                                                               \
 163     } while(FALSE)
 164
 165 #define pa_return_val_if_fail(expr, val)                                \
 166     do {                                                                \
 167         if (PA_UNLIKELY(!(expr))) {                                     \
 168             pa_log_debug("Assertion '%s' failed at %s:%u, function %s.\n", #expr , __FILE__, __LINE__, PA_PRETTY_FUNCTION); \
 169             return (val);                                               \
 170         }                                                               \
 171     } while(FALSE)
 172
 173 #define pa_return_null_if_fail(expr) pa_return_val_if_fail(expr, NULL)
 174
 175 /* pa_assert_se() is an assert which guarantees side effects of x,
 176  * i.e. is never optimized away, regardless of NDEBUG or FASTPATH. */
 177 #define pa_assert_se(expr)                                              \
 178     do {                                                                \
 179         if (PA_UNLIKELY(!(expr))) {                                     \
 180             pa_log_error("Assertion '%s' failed at %s:%u, function %s(). Aborting.", #expr , __FILE__, __LINE__, PA_PRETTY_FUNCTION); \
 181             abort();                                                    \
 182         }                                                               \
 183     } while (FALSE)
 184
 185 /* Does exactly nothing */
 186 #define pa_nop() do {} while (FALSE)
 187
 188 /* pa_assert() is an assert that may be optimized away by defining
 189  * NDEBUG. pa_assert_fp() is an assert that may be optimized away by
 190  * defining FASTPATH. It is supposed to be used in inner loops. It's
 191  * there for extra paranoia checking and should probably be removed in
 192  * production builds. */
 193 #ifdef NDEBUG
 194 #define pa_assert(expr) pa_nop()
 195 #define pa_assert_fp(expr) pa_nop()
 196 #elif defined (FASTPATH)
 197 #define pa_assert(expr) pa_assert_se(expr)
 198 #define pa_assert_fp(expr) pa_nop()
 199 #else
 200 #define pa_assert(expr) pa_assert_se(expr)
 201 #define pa_assert_fp(expr) pa_assert_se(expr)
 202 #endif
 203
 204 #ifdef NDEBUG
 205 #define pa_assert_not_reached() pa_nop()
 206 #else
 207 #define pa_assert_not_reached()                                         \
 208     do {                                                                \
 209         pa_log_error("Code should not be reached at %s:%u, function %s(). Aborting.", __FILE__, __LINE__, PA_PRETTY_FUNCTION); \
 210         abort();                                                        \
 211     } while (FALSE)
 212 #endif
 213
 214 /* A compile time assertion */
 215 #define pa_assert_cc(expr)                         \
 216     do {                                           \
 217         switch (0) {                               \
 218             case 0:                                \
 219             case !!(expr):                         \
 220                 ;                                  \
 221         }                                          \
 222     } while (FALSE)
 223
 224 #define PA_PTR_TO_UINT(p) ((unsigned int) ((uintptr_t) (p)))
 225 #define PA_UINT_TO_PTR(u) ((void*) ((uintptr_t) (u)))
 226
 227 #define PA_PTR_TO_UINT32(p) ((uint32_t) ((uintptr_t) (p)))
 228 #define PA_UINT32_TO_PTR(u) ((void*) ((uintptr_t) (u)))
 229
 230 #define PA_PTR_TO_INT(p) ((int) ((intptr_t) (p)))
 231 #define PA_INT_TO_PTR(u) ((void*) ((intptr_t) (u)))
 232
 233 #define PA_PTR_TO_INT32(p) ((int32_t) ((intptr_t) (p)))
 234 #define PA_INT32_TO_PTR(u) ((void*) ((intptr_t) (u)))
 235
 236 #ifdef OS_IS_WIN32
 237 #define PA_PATH_SEP "\\"
 238 #define PA_PATH_SEP_CHAR '\\'
 239 #else
 240 #define PA_PATH_SEP "/"
 241 #define PA_PATH_SEP_CHAR '/'
 242 #endif
 243
 244 #if defined(__GNUC__) && defined(__ELF__)
 245
 246 #define PA_WARN_REFERENCE(sym, msg)                  \
 247     __asm__(".section .gnu.warning." #sym);          \
 248     __asm__(".asciz \"" msg "\"");                   \
 249     __asm__(".previous")
 250
 251 #else
 252
 253 #define PA_WARN_REFERENCE(sym, msg)
 254
 255 #endif
 256
 257 #if defined(__i386__) || defined(__x86_64__)
 258 #define PA_DEBUG_TRAP __asm__("int $3")
 259 #else
 260 #define PA_DEBUG_TRAP raise(SIGTRAP)
 261 #endif
 262
 263 /* We include this at the very last place */
 264 #include <pulsecore/log.h>
 265
 266 #endif