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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 unlikely(expr) __builtin_expect ((expr), 0)
23 #else
24 #  define unlikely(expr)  (expr)
25 #endif
26 
27 #if defined (__GNUC__)
28 #  define MAYBE_UNUSED  __attribute__((unused))
29 #else
30 #  define MAYBE_UNUSED
31 #endif
32 
33 #ifndef INT16_MIN
34 # define INT16_MIN              (-32767-1)
35 #endif
36 
37 #ifndef INT16_MAX
38 # define INT16_MAX              (32767)
39 #endif
40 
41 #ifndef INT32_MIN
42 # define INT32_MIN              (-2147483647-1)
43 #endif
44 
45 #ifndef INT32_MAX
46 # define INT32_MAX              (2147483647)
47 #endif
48 
49 #ifndef UINT32_MIN
50 # define UINT32_MIN             (0)
51 #endif
52 
53 #ifndef UINT32_MAX
54 # define UINT32_MAX             (4294967295U)
55 #endif
56 
57 #ifndef INT64_MIN
58 # define INT64_MIN              (-9223372036854775807-1)
59 #endif
60 
61 #ifndef INT64_MAX
62 # define INT64_MAX              (9223372036854775807)
63 #endif
64 
65 #ifndef SIZE_MAX
66 # define SIZE_MAX               ((size_t)-1)
67 #endif
68 
69 
70 #ifndef M_PI
71 # define M_PI			3.14159265358979323846
72 #endif
73 
74 #ifdef _MSC_VER
75 /* 'inline' is available only in C++ in MSVC */
76 #   define inline __inline
77 #   define force_inline __forceinline
78 #   define noinline __declspec(noinline)
79 #elif defined __GNUC__ || (defined(__SUNPRO_C) && (__SUNPRO_C >= 0x590))
80 #   define inline __inline__
81 #   define force_inline __inline__ __attribute__ ((__always_inline__))
82 #   define noinline __attribute__((noinline))
83 #else
84 #   ifndef force_inline
85 #      define force_inline inline
86 #   endif
87 #   ifndef noinline
88 #      define noinline
89 #   endif
90 #endif
91 
92 /* GCC visibility */
93 #if defined(__GNUC__) && __GNUC__ >= 4 && !defined(_WIN32)
94 #   define PIXMAN_EXPORT __attribute__ ((visibility("default")))
95 /* Sun Studio 8 visibility */
96 #elif defined(__SUNPRO_C) && (__SUNPRO_C >= 0x550)
97 #   define PIXMAN_EXPORT __global
98 #else
99 #   define PIXMAN_EXPORT
100 #endif
101 
102 /* member offsets */
103 #define CONTAINER_OF(type, member, data)				\
104     ((type *)(((uint8_t *)data) - offsetof (type, member)))
105 
106 /* TLS */
107 #if defined(PIXMAN_NO_TLS)
108 
109 #   define PIXMAN_DEFINE_THREAD_LOCAL(type, name)			\
110     static type name
111 #   define PIXMAN_GET_THREAD_LOCAL(name)				\
112     (&name)
113 
114 #elif defined(TLS)
115 
116 #   define PIXMAN_DEFINE_THREAD_LOCAL(type, name)			\
117     static TLS type name
118 #   define PIXMAN_GET_THREAD_LOCAL(name)				\
119     (&name)
120 
121 #elif defined(__MINGW32__)
122 
123 #   define _NO_W32_PSEUDO_MODIFIERS
124 #   include <windows.h>
125 
126 #   define PIXMAN_DEFINE_THREAD_LOCAL(type, name)			\
127     static volatile int tls_ ## name ## _initialized = 0;		\
128     static void *tls_ ## name ## _mutex = NULL;				\
129     static unsigned tls_ ## name ## _index;				\
130 									\
131     static type *							\
132     tls_ ## name ## _alloc (void)					\
133     {									\
134         type *value = calloc (1, sizeof (type));			\
135         if (value)							\
136             TlsSetValue (tls_ ## name ## _index, value);		\
137         return value;							\
138     }									\
139 									\
140     static force_inline type *						\
141     tls_ ## name ## _get (void)						\
142     {									\
143 	type *value;							\
144 	if (!tls_ ## name ## _initialized)				\
145 	{								\
146 	    if (!tls_ ## name ## _mutex)				\
147 	    {								\
148 		void *mutex = CreateMutexA (NULL, 0, NULL);		\
149 		if (InterlockedCompareExchangePointer (			\
150 			&tls_ ## name ## _mutex, mutex, NULL) != NULL)	\
151 		{							\
152 		    CloseHandle (mutex);				\
153 		}							\
154 	    }								\
155 	    WaitForSingleObject (tls_ ## name ## _mutex, 0xFFFFFFFF);	\
156 	    if (!tls_ ## name ## _initialized)				\
157 	    {								\
158 		tls_ ## name ## _index = TlsAlloc ();			\
159 		tls_ ## name ## _initialized = 1;			\
160 	    }								\
161 	    ReleaseMutex (tls_ ## name ## _mutex);			\
162 	}								\
163 	if (tls_ ## name ## _index == 0xFFFFFFFF)			\
164 	    return NULL;						\
165 	value = TlsGetValue (tls_ ## name ## _index);			\
166 	if (!value)							\
167 	    value = tls_ ## name ## _alloc ();				\
168 	return value;							\
169     }
170 
171 #   define PIXMAN_GET_THREAD_LOCAL(name)				\
172     tls_ ## name ## _get ()
173 
174 #elif defined(_MSC_VER)
175 
176 #   define PIXMAN_DEFINE_THREAD_LOCAL(type, name)			\
177     static __declspec(thread) type name
178 #   define PIXMAN_GET_THREAD_LOCAL(name)				\
179     (&name)
180 
181 #elif defined(HAVE_PTHREAD_SETSPECIFIC)
182 
183 #include <pthread.h>
184 
185 #  define PIXMAN_DEFINE_THREAD_LOCAL(type, name)			\
186     static pthread_once_t tls_ ## name ## _once_control = PTHREAD_ONCE_INIT; \
187     static pthread_key_t tls_ ## name ## _key;				\
188 									\
189     static void								\
190     tls_ ## name ## _destroy_value (void *value)			\
191     {									\
192 	free (value);							\
193     }									\
194 									\
195     static void								\
196     tls_ ## name ## _make_key (void)					\
197     {									\
198 	pthread_key_create (&tls_ ## name ## _key,			\
199 			    tls_ ## name ## _destroy_value);		\
200     }									\
201 									\
202     static type *							\
203     tls_ ## name ## _alloc (void)					\
204     {									\
205 	type *value = calloc (1, sizeof (type));			\
206 	if (value)							\
207 	    pthread_setspecific (tls_ ## name ## _key, value);		\
208 	return value;							\
209     }									\
210 									\
211     static force_inline type *						\
212     tls_ ## name ## _get (void)						\
213     {									\
214 	type *value = NULL;						\
215 	if (pthread_once (&tls_ ## name ## _once_control,		\
216 			  tls_ ## name ## _make_key) == 0)		\
217 	{								\
218 	    value = pthread_getspecific (tls_ ## name ## _key);		\
219 	    if (!value)							\
220 		value = tls_ ## name ## _alloc ();			\
221 	}								\
222 	return value;							\
223     }
224 
225 #   define PIXMAN_GET_THREAD_LOCAL(name)				\
226     tls_ ## name ## _get ()
227 
228 #else
229 
230 #    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."
231 
232 #endif
233