pixman/pixman-compiler.h

   1 /* Pixman uses some non-standard compiler features. This file ensures
   2  * they exist
   3  *
   4  * The features are:
   5  *
   6  *    FUNC           must be defined to expand to the current function
   7  *    PIXMAN_EXPORT  should be defined to whatever is required to
   8  *                   export functions from a shared library
   9  *    limits         limits for various types must be defined
  10  *    inline         must be defined
  11  *    force_inline   must be defined
  12  */
  13 #if defined (__GNUC__)
  14 #  define FUNC     ((const char*) (__PRETTY_FUNCTION__))
  15 #elif defined (__sun) || (defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L)
  16 #  define FUNC     ((const char*) (__func__))
  17 #else
  18 #  define FUNC     ((const char*) ("???"))
  19 #endif
  20
  21 #if defined (__GNUC__)
  22 #  define MAYBE_UNUSED  __attribute__((unused))
  23 #else
  24 #  define MAYBE_UNUSED
  25 #endif
  26
  27 #ifndef INT16_MIN
  28 # define INT16_MIN              (-32767-1)
  29 #endif
  30
  31 #ifndef INT16_MAX
  32 # define INT16_MAX              (32767)
  33 #endif
  34
  35 #ifndef INT32_MIN
  36 # define INT32_MIN              (-2147483647-1)
  37 #endif
  38
  39 #ifndef INT32_MAX
  40 # define INT32_MAX              (2147483647)
  41 #endif
  42
  43 #ifndef UINT32_MIN
  44 # define UINT32_MIN             (0)
  45 #endif
  46
  47 #ifndef UINT32_MAX
  48 # define UINT32_MAX             (4294967295U)
  49 #endif
  50
  51 #ifndef M_PI
  52 # define M_PI                   3.14159265358979323846
  53 #endif
  54
  55 #ifdef _MSC_VER
  56 /* 'inline' is available only in C++ in MSVC */
  57 #   define inline __inline
  58 #   define force_inline __forceinline
  59 #   define noinline __declspec(noinline)
  60 #elif defined __GNUC__ || (defined(__SUNPRO_C) && (__SUNPRO_C >= 0x590))
  61 #   define inline __inline__
  62 #   define force_inline __inline__ __attribute__ ((__always_inline__))
  63 #   define noinline __attribute__((noinline))
  64 #else
  65 #   ifndef force_inline
  66 #      define force_inline inline
  67 #   endif
  68 #   ifndef noinline
  69 #      define noinline
  70 #   endif
  71 #endif
  72
  73 /* GCC visibility */
  74 #if defined(__GNUC__) && __GNUC__ >= 4 && !defined(_WIN32)
  75 #   define PIXMAN_EXPORT __attribute__ ((visibility("default")))
  76 /* Sun Studio 8 visibility */
  77 #elif defined(__SUNPRO_C) && (__SUNPRO_C >= 0x550)
  78 #   define PIXMAN_EXPORT __global
  79 #else
  80 #   define PIXMAN_EXPORT
  81 #endif
  82
  83 /* TLS */
  84 #if defined(PIXMAN_NO_TLS)
  85
  86 #   define PIXMAN_DEFINE_THREAD_LOCAL(type, name)                       \
  87     static type name
  88 #   define PIXMAN_GET_THREAD_LOCAL(name)                                \
  89     (&name)
  90
  91 #elif defined(TOOLCHAIN_SUPPORTS__THREAD)
  92
  93 #   define PIXMAN_DEFINE_THREAD_LOCAL(type, name)                       \
  94     static __thread type name
  95 #   define PIXMAN_GET_THREAD_LOCAL(name)                                \
  96     (&name)
  97
  98 #elif defined(__MINGW32__)
  99
 100 #   define _NO_W32_PSEUDO_MODIFIERS
 101 #   include <windows.h>
 102
 103 #   define PIXMAN_DEFINE_THREAD_LOCAL(type, name)                       \
 104     static volatile int tls_ ## name ## _initialized = 0;               \
 105     static void *tls_ ## name ## _mutex = NULL;                         \
 106     static unsigned tls_ ## name ## _index;                             \
 107                                                                         \
 108     static type *                                                       \
 109     tls_ ## name ## _alloc (void)                                       \
 110     {                                                                   \
 111         type *value = calloc (1, sizeof (type));                        \
 112         if (value)                                                      \
 113             TlsSetValue (tls_ ## name ## _index, value);                \
 114         return value;                                                   \
 115     }                                                                   \
 116                                                                         \
 117     static force_inline type *                                          \
 118     tls_ ## name ## _get (void)                                         \
 119     {                                                                   \
 120         type *value;                                                    \
 121         if (!tls_ ## name ## _initialized)                              \
 122         {                                                               \
 123             if (!tls_ ## name ## _mutex)                                \
 124             {                                                           \
 125                 void *mutex = CreateMutexA (NULL, 0, NULL);             \
 126                 if (InterlockedCompareExchangePointer (                 \
 127                         &tls_ ## name ## _mutex, mutex, NULL) != NULL)  \
 128                 {                                                       \
 129                     CloseHandle (mutex);                                \
 130                 }                                                       \
 131             }                                                           \
 132             WaitForSingleObject (tls_ ## name ## _mutex, 0xFFFFFFFF);   \
 133             if (!tls_ ## name ## _initialized)                          \
 134             {                                                           \
 135                 tls_ ## name ## _index = TlsAlloc ();                   \
 136                 tls_ ## name ## _initialized = 1;                       \
 137             }                                                           \
 138             ReleaseMutex (tls_ ## name ## _mutex);                      \
 139         }                                                               \
 140         if (tls_ ## name ## _index == 0xFFFFFFFF)                       \
 141             return NULL;                                                \
 142         value = TlsGetValue (tls_ ## name ## _index);                   \
 143         if (!value)                                                     \
 144             value = tls_ ## name ## _alloc ();                          \
 145         return value;                                                   \
 146     }
 147
 148 #   define PIXMAN_GET_THREAD_LOCAL(name)                                \
 149     tls_ ## name ## _get ()
 150
 151 #elif defined(_MSC_VER)
 152
 153 #   define PIXMAN_DEFINE_THREAD_LOCAL(type, name)                       \
 154     static __declspec(thread) type name
 155 #   define PIXMAN_GET_THREAD_LOCAL(name)                                \
 156     (&name)
 157
 158 #elif defined(HAVE_PTHREAD_SETSPECIFIC)
 159
 160 #include <pthread.h>
 161
 162 #  define PIXMAN_DEFINE_THREAD_LOCAL(type, name)                        \
 163     static pthread_once_t tls_ ## name ## _once_control = PTHREAD_ONCE_INIT; \
 164     static pthread_key_t tls_ ## name ## _key;                          \
 165                                                                         \
 166     static void                                                         \
 167     tls_ ## name ## _destroy_value (void *value)                        \
 168     {                                                                   \
 169         free (value);                                                   \
 170     }                                                                   \
 171                                                                         \
 172     static void                                                         \
 173     tls_ ## name ## _make_key (void)                                    \
 174     {                                                                   \
 175         pthread_key_create (&tls_ ## name ## _key,                      \
 176                             tls_ ## name ## _destroy_value);            \
 177     }                                                                   \
 178                                                                         \
 179     static type *                                                       \
 180     tls_ ## name ## _alloc (void)                                       \
 181     {                                                                   \
 182         type *value = calloc (1, sizeof (type));                        \
 183         if (value)                                                      \
 184             pthread_setspecific (tls_ ## name ## _key, value);          \
 185         return value;                                                   \
 186     }                                                                   \
 187                                                                         \
 188     static force_inline type *                                          \
 189     tls_ ## name ## _get (void)                                         \
 190     {                                                                   \
 191         type *value = NULL;                                             \
 192         if (pthread_once (&tls_ ## name ## _once_control,               \
 193                           tls_ ## name ## _make_key) == 0)              \
 194         {                                                               \
 195             value = pthread_getspecific (tls_ ## name ## _key);         \
 196             if (!value)                                                 \
 197                 value = tls_ ## name ## _alloc ();                      \
 198         }                                                               \
 199         return value;                                                   \
 200     }
 201
 202 #   define PIXMAN_GET_THREAD_LOCAL(name)                                \
 203     tls_ ## name ## _get ()
 204
 205 #else
 206
 207 #    error "Unknown thread local support for this system. Pixman will not work with multiple threads. Define PIXMAN_NO_TLS to acknowledge and accept this limitation and compile pixman without thread-safety support."
 208
 209 #endif