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Linux/include/linux/compiler.h

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  1 #ifndef __LINUX_COMPILER_H
  2 #define __LINUX_COMPILER_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 __acquires(x)  __attribute__((context(x,0,1)))
 14 # define __releases(x)  __attribute__((context(x,1,0)))
 15 # define __acquire(x)   __context__(x,1)
 16 # define __release(x)   __context__(x,-1)
 17 # define __cond_lock(x,c)       ((c) ? ({ __acquire(x); 1; }) : 0)
 18 # define __percpu       __attribute__((noderef, address_space(3)))
 19 #ifdef CONFIG_SPARSE_RCU_POINTER
 20 # define __rcu          __attribute__((noderef, address_space(4)))
 21 #else
 22 # define __rcu
 23 #endif
 24 extern void __chk_user_ptr(const volatile void __user *);
 25 extern void __chk_io_ptr(const volatile void __iomem *);
 26 #else
 27 # define __user
 28 # define __kernel
 29 # define __safe
 30 # define __force
 31 # define __nocast
 32 # define __iomem
 33 # define __chk_user_ptr(x) (void)0
 34 # define __chk_io_ptr(x) (void)0
 35 # define __builtin_warning(x, y...) (1)
 36 # define __acquires(x)
 37 # define __releases(x)
 38 # define __acquire(x) (void)0
 39 # define __release(x) (void)0
 40 # define __cond_lock(x,c) (c)
 41 # define __percpu
 42 # define __rcu
 43 #endif
 44 
 45 #ifdef __KERNEL__
 46 
 47 #ifdef __GNUC__
 48 #include <linux/compiler-gcc.h>
 49 #endif
 50 
 51 #define notrace __attribute__((no_instrument_function))
 52 
 53 /* Intel compiler defines __GNUC__. So we will overwrite implementations
 54  * coming from above header files here
 55  */
 56 #ifdef __INTEL_COMPILER
 57 # include <linux/compiler-intel.h>
 58 #endif
 59 
 60 /*
 61  * Generic compiler-dependent macros required for kernel
 62  * build go below this comment. Actual compiler/compiler version
 63  * specific implementations come from the above header files
 64  */
 65 
 66 struct ftrace_branch_data {
 67         const char *func;
 68         const char *file;
 69         unsigned line;
 70         union {
 71                 struct {
 72                         unsigned long correct;
 73                         unsigned long incorrect;
 74                 };
 75                 struct {
 76                         unsigned long miss;
 77                         unsigned long hit;
 78                 };
 79                 unsigned long miss_hit[2];
 80         };
 81 };
 82 
 83 /*
 84  * Note: DISABLE_BRANCH_PROFILING can be used by special lowlevel code
 85  * to disable branch tracing on a per file basis.
 86  */
 87 #if defined(CONFIG_TRACE_BRANCH_PROFILING) \
 88     && !defined(DISABLE_BRANCH_PROFILING) && !defined(__CHECKER__)
 89 void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect);
 90 
 91 #define likely_notrace(x)       __builtin_expect(!!(x), 1)
 92 #define unlikely_notrace(x)     __builtin_expect(!!(x), 0)
 93 
 94 #define __branch_check__(x, expect) ({                                  \
 95                         int ______r;                                    \
 96                         static struct ftrace_branch_data                \
 97                                 __attribute__((__aligned__(4)))         \
 98                                 __attribute__((section("_ftrace_annotated_branch"))) \
 99                                 ______f = {                             \
100                                 .func = __func__,                       \
101                                 .file = __FILE__,                       \
102                                 .line = __LINE__,                       \
103                         };                                              \
104                         ______r = likely_notrace(x);                    \
105                         ftrace_likely_update(&______f, ______r, expect); \
106                         ______r;                                        \
107                 })
108 
109 /*
110  * Using __builtin_constant_p(x) to ignore cases where the return
111  * value is always the same.  This idea is taken from a similar patch
112  * written by Daniel Walker.
113  */
114 # ifndef likely
115 #  define likely(x)     (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 1))
116 # endif
117 # ifndef unlikely
118 #  define unlikely(x)   (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 0))
119 # endif
120 
121 #ifdef CONFIG_PROFILE_ALL_BRANCHES
122 /*
123  * "Define 'is'", Bill Clinton
124  * "Define 'if'", Steven Rostedt
125  */
126 #define if(cond, ...) __trace_if( (cond , ## __VA_ARGS__) )
127 #define __trace_if(cond) \
128         if (__builtin_constant_p((cond)) ? !!(cond) :                   \
129         ({                                                              \
130                 int ______r;                                            \
131                 static struct ftrace_branch_data                        \
132                         __attribute__((__aligned__(4)))                 \
133                         __attribute__((section("_ftrace_branch")))      \
134                         ______f = {                                     \
135                                 .func = __func__,                       \
136                                 .file = __FILE__,                       \
137                                 .line = __LINE__,                       \
138                         };                                              \
139                 ______r = !!(cond);                                     \
140                 ______f.miss_hit[______r]++;                                    \
141                 ______r;                                                \
142         }))
143 #endif /* CONFIG_PROFILE_ALL_BRANCHES */
144 
145 #else
146 # define likely(x)      __builtin_expect(!!(x), 1)
147 # define unlikely(x)    __builtin_expect(!!(x), 0)
148 #endif
149 
150 /* Optimization barrier */
151 #ifndef barrier
152 # define barrier() __memory_barrier()
153 #endif
154 
155 /* Unreachable code */
156 #ifndef unreachable
157 # define unreachable() do { } while (1)
158 #endif
159 
160 #ifndef RELOC_HIDE
161 # define RELOC_HIDE(ptr, off)                                   \
162   ({ unsigned long __ptr;                                       \
163      __ptr = (unsigned long) (ptr);                             \
164     (typeof(ptr)) (__ptr + (off)); })
165 #endif
166 
167 #endif /* __KERNEL__ */
168 
169 #endif /* __ASSEMBLY__ */
170 
171 #ifdef __KERNEL__
172 /*
173  * Allow us to mark functions as 'deprecated' and have gcc emit a nice
174  * warning for each use, in hopes of speeding the functions removal.
175  * Usage is:
176  *              int __deprecated foo(void)
177  */
178 #ifndef __deprecated
179 # define __deprecated           /* unimplemented */
180 #endif
181 
182 #ifdef MODULE
183 #define __deprecated_for_modules __deprecated
184 #else
185 #define __deprecated_for_modules
186 #endif
187 
188 #ifndef __must_check
189 #define __must_check
190 #endif
191 
192 #ifndef CONFIG_ENABLE_MUST_CHECK
193 #undef __must_check
194 #define __must_check
195 #endif
196 #ifndef CONFIG_ENABLE_WARN_DEPRECATED
197 #undef __deprecated
198 #undef __deprecated_for_modules
199 #define __deprecated
200 #define __deprecated_for_modules
201 #endif
202 
203 /*
204  * Allow us to avoid 'defined but not used' warnings on functions and data,
205  * as well as force them to be emitted to the assembly file.
206  *
207  * As of gcc 3.4, static functions that are not marked with attribute((used))
208  * may be elided from the assembly file.  As of gcc 3.4, static data not so
209  * marked will not be elided, but this may change in a future gcc version.
210  *
211  * NOTE: Because distributions shipped with a backported unit-at-a-time
212  * compiler in gcc 3.3, we must define __used to be __attribute__((used))
213  * for gcc >=3.3 instead of 3.4.
214  *
215  * In prior versions of gcc, such functions and data would be emitted, but
216  * would be warned about except with attribute((unused)).
217  *
218  * Mark functions that are referenced only in inline assembly as __used so
219  * the code is emitted even though it appears to be unreferenced.
220  */
221 #ifndef __used
222 # define __used                 /* unimplemented */
223 #endif
224 
225 #ifndef __maybe_unused
226 # define __maybe_unused         /* unimplemented */
227 #endif
228 
229 #ifndef __always_unused
230 # define __always_unused        /* unimplemented */
231 #endif
232 
233 #ifndef noinline
234 #define noinline
235 #endif
236 
237 /*
238  * Rather then using noinline to prevent stack consumption, use
239  * noinline_for_stack instead.  For documentaiton reasons.
240  */
241 #define noinline_for_stack noinline
242 
243 #ifndef __always_inline
244 #define __always_inline inline
245 #endif
246 
247 #endif /* __KERNEL__ */
248 
249 /*
250  * From the GCC manual:
251  *
252  * Many functions do not examine any values except their arguments,
253  * and have no effects except the return value.  Basically this is
254  * just slightly more strict class than the `pure' attribute above,
255  * since function is not allowed to read global memory.
256  *
257  * Note that a function that has pointer arguments and examines the
258  * data pointed to must _not_ be declared `const'.  Likewise, a
259  * function that calls a non-`const' function usually must not be
260  * `const'.  It does not make sense for a `const' function to return
261  * `void'.
262  */
263 #ifndef __attribute_const__
264 # define __attribute_const__    /* unimplemented */
265 #endif
266 
267 /*
268  * Tell gcc if a function is cold. The compiler will assume any path
269  * directly leading to the call is unlikely.
270  */
271 
272 #ifndef __cold
273 #define __cold
274 #endif
275 
276 /* Simple shorthand for a section definition */
277 #ifndef __section
278 # define __section(S) __attribute__ ((__section__(#S)))
279 #endif
280 
281 /* Are two types/vars the same type (ignoring qualifiers)? */
282 #ifndef __same_type
283 # define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))
284 #endif
285 
286 /* Compile time object size, -1 for unknown */
287 #ifndef __compiletime_object_size
288 # define __compiletime_object_size(obj) -1
289 #endif
290 #ifndef __compiletime_warning
291 # define __compiletime_warning(message)
292 #endif
293 #ifndef __compiletime_error
294 # define __compiletime_error(message)
295 #endif
296 
297 /*
298  * Prevent the compiler from merging or refetching accesses.  The compiler
299  * is also forbidden from reordering successive instances of ACCESS_ONCE(),
300  * but only when the compiler is aware of some particular ordering.  One way
301  * to make the compiler aware of ordering is to put the two invocations of
302  * ACCESS_ONCE() in different C statements.
303  *
304  * This macro does absolutely -nothing- to prevent the CPU from reordering,
305  * merging, or refetching absolutely anything at any time.  Its main intended
306  * use is to mediate communication between process-level code and irq/NMI
307  * handlers, all running on the same CPU.
308  */
309 #define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x))
310 
311 #endif /* __LINUX_COMPILER_H */
312 

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