1 /* GLIB - Library of useful routines for C programming
2 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
19 * Modified by the GLib Team and others 1997-2000. See the AUTHORS
20 * file for a list of people on the GLib Team. See the ChangeLog
21 * files for a list of changes. These files are distributed with
22 * GLib at ftp://ftp.gtk.org/pub/gtk/.
25 /* This file must not include any other glib header file and must thus
26 * not refer to variables from glibconfig.h
29 #ifndef __G_MACROS_H__
30 #define __G_MACROS_H__
32 #if !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
33 #error "Only <glib.h> can be included directly."
36 /* We include stddef.h to get the system's definition of NULL
40 /* Here we provide G_GNUC_EXTENSION as an alias for __extension__,
41 * where this is valid. This allows for warningless compilation of
42 * "long long" types even in the presence of '-ansi -pedantic'.
44 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 8)
45 # define G_GNUC_EXTENSION __extension__
47 # define G_GNUC_EXTENSION
50 /* Provide macros to feature the GCC function attribute.
52 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96)
54 __attribute__((__pure__))
55 #define G_GNUC_MALLOC \
56 __attribute__((__malloc__))
63 #define G_GNUC_NULL_TERMINATED __attribute__((__sentinel__))
65 #define G_GNUC_NULL_TERMINATED
68 #if (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)
69 #define G_GNUC_ALLOC_SIZE(x) __attribute__((__alloc_size__(x)))
70 #define G_GNUC_ALLOC_SIZE2(x,y) __attribute__((__alloc_size__(x,y)))
72 #define G_GNUC_ALLOC_SIZE(x)
73 #define G_GNUC_ALLOC_SIZE2(x,y)
76 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ > 4)
77 #define G_GNUC_PRINTF( format_idx, arg_idx ) \
78 __attribute__((__format__ (__printf__, format_idx, arg_idx)))
79 #define G_GNUC_SCANF( format_idx, arg_idx ) \
80 __attribute__((__format__ (__scanf__, format_idx, arg_idx)))
81 #define G_GNUC_FORMAT( arg_idx ) \
82 __attribute__((__format_arg__ (arg_idx)))
83 #define G_GNUC_NORETURN \
84 __attribute__((__noreturn__))
85 #define G_GNUC_CONST \
86 __attribute__((__const__))
87 #define G_GNUC_UNUSED \
88 __attribute__((__unused__))
89 #define G_GNUC_NO_INSTRUMENT \
90 __attribute__((__no_instrument_function__))
92 #define G_GNUC_PRINTF( format_idx, arg_idx )
93 #define G_GNUC_SCANF( format_idx, arg_idx )
94 #define G_GNUC_FORMAT( arg_idx )
95 #define G_GNUC_NORETURN
98 #define G_GNUC_NO_INSTRUMENT
99 #endif /* !__GNUC__ */
101 #if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1)
102 #define G_GNUC_DEPRECATED \
103 __attribute__((__deprecated__))
105 #define G_GNUC_DEPRECATED
106 #endif /* __GNUC__ */
108 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5)
109 #define G_GNUC_DEPRECATED_FOR(f) \
110 __attribute__((deprecated("Use " #f " instead")))
112 #define G_GNUC_DEPRECATED_FOR(f) G_GNUC_DEPRECATED
113 #endif /* __GNUC__ */
115 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)
116 #define G_GNUC_BEGIN_IGNORE_DEPRECATIONS \
117 _Pragma ("GCC diagnostic push") \
118 _Pragma ("GCC diagnostic ignored \"-Wdeprecated-declarations\"")
119 #define G_GNUC_END_IGNORE_DEPRECATIONS \
120 _Pragma ("GCC diagnostic pop")
121 #elif defined (_MSC_VER) && (_MSC_VER >= 1500)
122 #define G_GNUC_BEGIN_IGNORE_DEPRECATIONS \
123 __pragma (warning (push)) \
124 __pragma (warning (disable : 4996))
125 #define G_GNUC_END_IGNORE_DEPRECATIONS \
126 __pragma (warning (pop))
128 #define G_GNUC_BEGIN_IGNORE_DEPRECATIONS
129 #define G_GNUC_END_IGNORE_DEPRECATIONS
132 #if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 3)
133 # define G_GNUC_MAY_ALIAS __attribute__((may_alias))
135 # define G_GNUC_MAY_ALIAS
138 #if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)
139 #define G_GNUC_WARN_UNUSED_RESULT \
140 __attribute__((warn_unused_result))
142 #define G_GNUC_WARN_UNUSED_RESULT
143 #endif /* __GNUC__ */
145 #ifndef G_DISABLE_DEPRECATED
146 /* Wrap the gcc __PRETTY_FUNCTION__ and __FUNCTION__ variables with
147 * macros, so we can refer to them as strings unconditionally.
148 * usage not-recommended since gcc-3.0
150 #if defined (__GNUC__) && (__GNUC__ < 3)
151 #define G_GNUC_FUNCTION __FUNCTION__
152 #define G_GNUC_PRETTY_FUNCTION __PRETTY_FUNCTION__
153 #else /* !__GNUC__ */
154 #define G_GNUC_FUNCTION ""
155 #define G_GNUC_PRETTY_FUNCTION ""
156 #endif /* !__GNUC__ */
157 #endif /* !G_DISABLE_DEPRECATED */
159 /* Clang feature detection: http://clang.llvm.org/docs/LanguageExtensions.html */
160 #ifndef __has_feature
161 #define __has_feature(x) 0
164 #if __has_feature(attribute_analyzer_noreturn)
165 #define G_ANALYZER_ANALYZING 1
166 #define G_ANALYZER_NORETURN __attribute__((analyzer_noreturn))
168 #define G_ANALYZER_ANALYZING 0
169 #define G_ANALYZER_NORETURN
172 #define G_STRINGIFY(macro_or_string) G_STRINGIFY_ARG (macro_or_string)
173 #define G_STRINGIFY_ARG(contents) #contents
175 #ifndef __GI_SCANNER__ /* The static assert macro really confuses the introspection parser */
176 #define G_PASTE_ARGS(identifier1,identifier2) identifier1 ## identifier2
177 #define G_PASTE(identifier1,identifier2) G_PASTE_ARGS (identifier1, identifier2)
179 #define G_STATIC_ASSERT(expr) typedef char G_PASTE (_GStaticAssertCompileTimeAssertion_, __COUNTER__)[(expr) ? 1 : -1] G_GNUC_UNUSED
181 #define G_STATIC_ASSERT(expr) typedef char G_PASTE (_GStaticAssertCompileTimeAssertion_, __LINE__)[(expr) ? 1 : -1] G_GNUC_UNUSED
183 #define G_STATIC_ASSERT_EXPR(expr) ((void) sizeof (char[(expr) ? 1 : -1]))
186 /* Provide a string identifying the current code position */
187 #if defined(__GNUC__) && (__GNUC__ < 3) && !defined(__cplusplus)
188 # define G_STRLOC __FILE__ ":" G_STRINGIFY (__LINE__) ":" __PRETTY_FUNCTION__ "()"
190 # define G_STRLOC __FILE__ ":" G_STRINGIFY (__LINE__)
193 /* Provide a string identifying the current function, non-concatenatable */
194 #if defined (__GNUC__) && defined (__cplusplus)
195 # define G_STRFUNC ((const char*) (__PRETTY_FUNCTION__))
196 #elif defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
197 # define G_STRFUNC ((const char*) (__func__))
198 #elif defined (__GNUC__) || (defined(_MSC_VER) && (_MSC_VER > 1300))
199 # define G_STRFUNC ((const char*) (__FUNCTION__))
201 # define G_STRFUNC ((const char*) ("???"))
204 /* Guard C code in headers, while including them from C++ */
206 # define G_BEGIN_DECLS extern "C" {
207 # define G_END_DECLS }
209 # define G_BEGIN_DECLS
213 /* Provide definitions for some commonly used macros.
214 * Some of them are only provided if they haven't already
215 * been defined. It is assumed that if they are already
216 * defined then the current definition is correct.
221 # else /* !__cplusplus */
222 # define NULL ((void*) 0)
223 # endif /* !__cplusplus */
231 #define TRUE (!FALSE)
235 #define MAX(a, b) (((a) > (b)) ? (a) : (b))
238 #define MIN(a, b) (((a) < (b)) ? (a) : (b))
241 #define ABS(a) (((a) < 0) ? -(a) : (a))
244 #define CLAMP(x, low, high) (((x) > (high)) ? (high) : (((x) < (low)) ? (low) : (x)))
246 /* Count the number of elements in an array. The array must be defined
247 * as such; using this with a dynamically allocated array will give
250 #define G_N_ELEMENTS(arr) (sizeof (arr) / sizeof ((arr)[0]))
252 /* Macros by analogy to GINT_TO_POINTER, GPOINTER_TO_INT
254 #define GPOINTER_TO_SIZE(p) ((gsize) (p))
255 #define GSIZE_TO_POINTER(s) ((gpointer) (gsize) (s))
257 /* Provide convenience macros for handling structure
258 * fields through their offsets.
261 #if defined(__GNUC__) && __GNUC__ >= 4
262 # define G_STRUCT_OFFSET(struct_type, member) \
263 ((glong) offsetof (struct_type, member))
265 # define G_STRUCT_OFFSET(struct_type, member) \
266 ((glong) ((guint8*) &((struct_type*) 0)->member))
269 #define G_STRUCT_MEMBER_P(struct_p, struct_offset) \
270 ((gpointer) ((guint8*) (struct_p) + (glong) (struct_offset)))
271 #define G_STRUCT_MEMBER(member_type, struct_p, struct_offset) \
272 (*(member_type*) G_STRUCT_MEMBER_P ((struct_p), (struct_offset)))
274 /* Provide simple macro statement wrappers:
275 * G_STMT_START { statements; } G_STMT_END;
276 * This can be used as a single statement, like:
277 * if (x) G_STMT_START { ... } G_STMT_END; else ...
278 * This intentionally does not use compiler extensions like GCC's '({...})' to
279 * avoid portability issue or side effects when compiled with different compilers.
281 #if !(defined (G_STMT_START) && defined (G_STMT_END))
282 # define G_STMT_START do
283 # define G_STMT_END while (0)
286 /* Deprecated -- do not use. */
287 #ifndef G_DISABLE_DEPRECATED
288 #ifdef G_DISABLE_CONST_RETURNS
289 #define G_CONST_RETURN
291 #define G_CONST_RETURN const
296 * The G_LIKELY and G_UNLIKELY macros let the programmer give hints to
297 * the compiler about the expected result of an expression. Some compilers
298 * can use this information for optimizations.
300 * The _G_BOOLEAN_EXPR macro is intended to trigger a gcc warning when
301 * putting assignments in g_return_if_fail ().
303 #if defined(__GNUC__) && (__GNUC__ > 2) && defined(__OPTIMIZE__)
304 #define _G_BOOLEAN_EXPR(expr) \
305 G_GNUC_EXTENSION ({ \
306 int _g_boolean_var_; \
308 _g_boolean_var_ = 1; \
310 _g_boolean_var_ = 0; \
313 #define G_LIKELY(expr) (__builtin_expect (_G_BOOLEAN_EXPR(expr), 1))
314 #define G_UNLIKELY(expr) (__builtin_expect (_G_BOOLEAN_EXPR(expr), 0))
316 #define G_LIKELY(expr) (expr)
317 #define G_UNLIKELY(expr) (expr)
320 #if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1)
321 #define G_DEPRECATED __attribute__((__deprecated__))
322 #elif defined(_MSC_VER) && (_MSC_VER >= 1300)
323 #define G_DEPRECATED __declspec(deprecated)
328 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5)
329 #define G_DEPRECATED_FOR(f) __attribute__((__deprecated__("Use '" #f "' instead")))
330 #elif defined(_MSC_FULL_VER) && (_MSC_FULL_VER > 140050320)
331 #define G_DEPRECATED_FOR(f) __declspec(deprecated("is deprecated. Use '" #f "' instead"))
333 #define G_DEPRECATED_FOR(f) G_DEPRECATED
336 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5)
337 #define G_UNAVAILABLE(maj,min) __attribute__((deprecated("Not available before " #maj "." #min)))
338 #elif defined(_MSC_FULL_VER) && (_MSC_FULL_VER > 140050320)
339 #define G_UNAVAILABLE(maj,min) __declspec(deprecated("is not available before " #maj "." #min))
341 #define G_UNAVAILABLE(maj,min) G_DEPRECATED
345 #define _GLIB_EXTERN extern
348 /* These macros are used to mark deprecated functions in GLib headers,
349 * and thus have to be exposed in installed headers. But please
350 * do *not* use them in other projects. Instead, use G_DEPRECATED
351 * or define your own wrappers around it.
354 #ifdef GLIB_DISABLE_DEPRECATION_WARNINGS
355 #define GLIB_DEPRECATED _GLIB_EXTERN
356 #define GLIB_DEPRECATED_FOR(f) _GLIB_EXTERN
357 #define GLIB_UNAVAILABLE(maj,min) _GLIB_EXTERN
359 #define GLIB_DEPRECATED G_DEPRECATED _GLIB_EXTERN
360 #define GLIB_DEPRECATED_FOR(f) G_DEPRECATED_FOR(f) _GLIB_EXTERN
361 #define GLIB_UNAVAILABLE(maj,min) G_UNAVAILABLE(maj,min) _GLIB_EXTERN
364 #endif /* __G_MACROS_H__ */