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TOMOYO Linux Cross Reference
Linux/include/linux/compiler_types.h

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  1 #ifndef __LINUX_COMPILER_TYPES_H
  2 #define __LINUX_COMPILER_TYPES_H
  3 
  4 #ifndef __ASSEMBLY__
  5 
  6 #ifdef __CHECKER__
  7 # define __user         __attribute__((noderef, address_space(1)))
  8 # define __kernel       __attribute__((address_space(0)))
  9 # define __safe         __attribute__((safe))
 10 # define __force        __attribute__((force))
 11 # define __nocast       __attribute__((nocast))
 12 # define __iomem        __attribute__((noderef, address_space(2)))
 13 # define __must_hold(x) __attribute__((context(x,1,1)))
 14 # define __acquires(x)  __attribute__((context(x,0,1)))
 15 # define __releases(x)  __attribute__((context(x,1,0)))
 16 # define __acquire(x)   __context__(x,1)
 17 # define __release(x)   __context__(x,-1)
 18 # define __cond_lock(x,c)       ((c) ? ({ __acquire(x); 1; }) : 0)
 19 # define __percpu       __attribute__((noderef, address_space(3)))
 20 # define __rcu          __attribute__((noderef, address_space(4)))
 21 # define __private      __attribute__((noderef))
 22 extern void __chk_user_ptr(const volatile void __user *);
 23 extern void __chk_io_ptr(const volatile void __iomem *);
 24 # define ACCESS_PRIVATE(p, member) (*((typeof((p)->member) __force *) &(p)->member))
 25 #else /* __CHECKER__ */
 26 # ifdef STRUCTLEAK_PLUGIN
 27 #  define __user __attribute__((user))
 28 # else
 29 #  define __user
 30 # endif
 31 # define __kernel
 32 # define __safe
 33 # define __force
 34 # define __nocast
 35 # define __iomem
 36 # define __chk_user_ptr(x) (void)0
 37 # define __chk_io_ptr(x) (void)0
 38 # define __builtin_warning(x, y...) (1)
 39 # define __must_hold(x)
 40 # define __acquires(x)
 41 # define __releases(x)
 42 # define __acquire(x) (void)0
 43 # define __release(x) (void)0
 44 # define __cond_lock(x,c) (c)
 45 # define __percpu
 46 # define __rcu
 47 # define __private
 48 # define ACCESS_PRIVATE(p, member) ((p)->member)
 49 #endif /* __CHECKER__ */
 50 
 51 /* Indirect macros required for expanded argument pasting, eg. __LINE__. */
 52 #define ___PASTE(a,b) a##b
 53 #define __PASTE(a,b) ___PASTE(a,b)
 54 
 55 #ifdef __KERNEL__
 56 
 57 #ifdef __GNUC__
 58 #include <linux/compiler-gcc.h>
 59 #endif
 60 
 61 #if defined(CC_USING_HOTPATCH) && !defined(__CHECKER__)
 62 #define notrace __attribute__((hotpatch(0,0)))
 63 #else
 64 #define notrace __attribute__((no_instrument_function))
 65 #endif
 66 
 67 /* Intel compiler defines __GNUC__. So we will overwrite implementations
 68  * coming from above header files here
 69  */
 70 #ifdef __INTEL_COMPILER
 71 # include <linux/compiler-intel.h>
 72 #endif
 73 
 74 /* Clang compiler defines __GNUC__. So we will overwrite implementations
 75  * coming from above header files here
 76  */
 77 #ifdef __clang__
 78 #include <linux/compiler-clang.h>
 79 #endif
 80 
 81 /*
 82  * Generic compiler-dependent macros required for kernel
 83  * build go below this comment. Actual compiler/compiler version
 84  * specific implementations come from the above header files
 85  */
 86 
 87 struct ftrace_branch_data {
 88         const char *func;
 89         const char *file;
 90         unsigned line;
 91         union {
 92                 struct {
 93                         unsigned long correct;
 94                         unsigned long incorrect;
 95                 };
 96                 struct {
 97                         unsigned long miss;
 98                         unsigned long hit;
 99                 };
100                 unsigned long miss_hit[2];
101         };
102 };
103 
104 struct ftrace_likely_data {
105         struct ftrace_branch_data       data;
106         unsigned long                   constant;
107 };
108 
109 #endif /* __KERNEL__ */
110 
111 #endif /* __ASSEMBLY__ */
112 
113 #ifdef __KERNEL__
114 /*
115  * Allow us to mark functions as 'deprecated' and have gcc emit a nice
116  * warning for each use, in hopes of speeding the functions removal.
117  * Usage is:
118  *              int __deprecated foo(void)
119  */
120 #ifndef __deprecated
121 # define __deprecated           /* unimplemented */
122 #endif
123 
124 #ifdef MODULE
125 #define __deprecated_for_modules __deprecated
126 #else
127 #define __deprecated_for_modules
128 #endif
129 
130 #ifndef __must_check
131 #define __must_check
132 #endif
133 
134 #ifndef CONFIG_ENABLE_MUST_CHECK
135 #undef __must_check
136 #define __must_check
137 #endif
138 #ifndef CONFIG_ENABLE_WARN_DEPRECATED
139 #undef __deprecated
140 #undef __deprecated_for_modules
141 #define __deprecated
142 #define __deprecated_for_modules
143 #endif
144 
145 #ifndef __malloc
146 #define __malloc
147 #endif
148 
149 /*
150  * Allow us to avoid 'defined but not used' warnings on functions and data,
151  * as well as force them to be emitted to the assembly file.
152  *
153  * As of gcc 3.4, static functions that are not marked with attribute((used))
154  * may be elided from the assembly file.  As of gcc 3.4, static data not so
155  * marked will not be elided, but this may change in a future gcc version.
156  *
157  * NOTE: Because distributions shipped with a backported unit-at-a-time
158  * compiler in gcc 3.3, we must define __used to be __attribute__((used))
159  * for gcc >=3.3 instead of 3.4.
160  *
161  * In prior versions of gcc, such functions and data would be emitted, but
162  * would be warned about except with attribute((unused)).
163  *
164  * Mark functions that are referenced only in inline assembly as __used so
165  * the code is emitted even though it appears to be unreferenced.
166  */
167 #ifndef __used
168 # define __used                 /* unimplemented */
169 #endif
170 
171 #ifndef __maybe_unused
172 # define __maybe_unused         /* unimplemented */
173 #endif
174 
175 #ifndef __always_unused
176 # define __always_unused        /* unimplemented */
177 #endif
178 
179 #ifndef noinline
180 #define noinline
181 #endif
182 
183 /*
184  * Rather then using noinline to prevent stack consumption, use
185  * noinline_for_stack instead.  For documentation reasons.
186  */
187 #define noinline_for_stack noinline
188 
189 #ifndef __always_inline
190 #define __always_inline inline
191 #endif
192 
193 #endif /* __KERNEL__ */
194 
195 /*
196  * From the GCC manual:
197  *
198  * Many functions do not examine any values except their arguments,
199  * and have no effects except the return value.  Basically this is
200  * just slightly more strict class than the `pure' attribute above,
201  * since function is not allowed to read global memory.
202  *
203  * Note that a function that has pointer arguments and examines the
204  * data pointed to must _not_ be declared `const'.  Likewise, a
205  * function that calls a non-`const' function usually must not be
206  * `const'.  It does not make sense for a `const' function to return
207  * `void'.
208  */
209 #ifndef __attribute_const__
210 # define __attribute_const__    /* unimplemented */
211 #endif
212 
213 #ifndef __designated_init
214 # define __designated_init
215 #endif
216 
217 #ifndef __latent_entropy
218 # define __latent_entropy
219 #endif
220 
221 #ifndef __randomize_layout
222 # define __randomize_layout __designated_init
223 #endif
224 
225 #ifndef __no_randomize_layout
226 # define __no_randomize_layout
227 #endif
228 
229 #ifndef randomized_struct_fields_start
230 # define randomized_struct_fields_start
231 # define randomized_struct_fields_end
232 #endif
233 
234 /*
235  * Tell gcc if a function is cold. The compiler will assume any path
236  * directly leading to the call is unlikely.
237  */
238 
239 #ifndef __cold
240 #define __cold
241 #endif
242 
243 /* Simple shorthand for a section definition */
244 #ifndef __section
245 # define __section(S) __attribute__ ((__section__(#S)))
246 #endif
247 
248 #ifndef __visible
249 #define __visible
250 #endif
251 
252 #ifndef __nostackprotector
253 # define __nostackprotector
254 #endif
255 
256 /*
257  * Assume alignment of return value.
258  */
259 #ifndef __assume_aligned
260 #define __assume_aligned(a, ...)
261 #endif
262 
263 
264 /* Are two types/vars the same type (ignoring qualifiers)? */
265 #ifndef __same_type
266 # define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))
267 #endif
268 
269 /* Is this type a native word size -- useful for atomic operations */
270 #ifndef __native_word
271 # define __native_word(t) (sizeof(t) == sizeof(char) || sizeof(t) == sizeof(short) || sizeof(t) == sizeof(int) || sizeof(t) == sizeof(long))
272 #endif
273 
274 #endif /* __LINUX_COMPILER_TYPES_H */
275 

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