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66dbeef9 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
d1515582 WD |
2 | #ifndef __LINUX_COMPILER_TYPES_H |
3 | #define __LINUX_COMPILER_TYPES_H | |
4 | ||
26dd68d2 PK |
5 | /* |
6 | * __has_builtin is supported on gcc >= 10, clang >= 3 and icc >= 21. | |
7 | * In the meantime, to support gcc < 10, we implement __has_builtin | |
8 | * by hand. | |
9 | */ | |
10 | #ifndef __has_builtin | |
11 | #define __has_builtin(x) (0) | |
12 | #endif | |
13 | ||
d1515582 WD |
14 | #ifndef __ASSEMBLY__ |
15 | ||
2f7ab126 MO |
16 | /* |
17 | * Skipped when running bindgen due to a libclang issue; | |
18 | * see https://github.com/rust-lang/rust-bindgen/issues/2244. | |
19 | */ | |
6789ab96 | 20 | #if defined(CONFIG_DEBUG_INFO_BTF) && defined(CONFIG_PAHOLE_HAS_BTF_TAG) && \ |
2f7ab126 | 21 | __has_attribute(btf_type_tag) && !defined(__BINDGEN__) |
6789ab96 HL |
22 | # define BTF_TYPE_TAG(value) __attribute__((btf_type_tag(#value))) |
23 | #else | |
24 | # define BTF_TYPE_TAG(value) /* nothing */ | |
25 | #endif | |
26 | ||
179fd6ba | 27 | /* sparse defines __CHECKER__; see Documentation/dev-tools/sparse.rst */ |
d1515582 | 28 | #ifdef __CHECKER__ |
25fd529c | 29 | /* address spaces */ |
d1515582 | 30 | # define __kernel __attribute__((address_space(0))) |
670d0a4b | 31 | # define __user __attribute__((noderef, address_space(__user))) |
670d0a4b | 32 | # define __iomem __attribute__((noderef, address_space(__iomem))) |
25fd529c LVO |
33 | # define __percpu __attribute__((noderef, address_space(__percpu))) |
34 | # define __rcu __attribute__((noderef, address_space(__rcu))) | |
e5fc436f LVO |
35 | static inline void __chk_user_ptr(const volatile void __user *ptr) { } |
36 | static inline void __chk_io_ptr(const volatile void __iomem *ptr) { } | |
25fd529c | 37 | /* context/locking */ |
d1515582 WD |
38 | # define __must_hold(x) __attribute__((context(x,1,1))) |
39 | # define __acquires(x) __attribute__((context(x,0,1))) | |
4a557a5d | 40 | # define __cond_acquires(x) __attribute__((context(x,0,-1))) |
d1515582 WD |
41 | # define __releases(x) __attribute__((context(x,1,0))) |
42 | # define __acquire(x) __context__(x,1) | |
43 | # define __release(x) __context__(x,-1) | |
44 | # define __cond_lock(x,c) ((c) ? ({ __acquire(x); 1; }) : 0) | |
25fd529c LVO |
45 | /* other */ |
46 | # define __force __attribute__((force)) | |
47 | # define __nocast __attribute__((nocast)) | |
48 | # define __safe __attribute__((safe)) | |
d1515582 | 49 | # define __private __attribute__((noderef)) |
d1515582 WD |
50 | # define ACCESS_PRIVATE(p, member) (*((typeof((p)->member) __force *) &(p)->member)) |
51 | #else /* __CHECKER__ */ | |
25fd529c LVO |
52 | /* address spaces */ |
53 | # define __kernel | |
d1515582 | 54 | # ifdef STRUCTLEAK_PLUGIN |
25fd529c | 55 | # define __user __attribute__((user)) |
d1515582 | 56 | # else |
6789ab96 | 57 | # define __user BTF_TYPE_TAG(user) |
d1515582 | 58 | # endif |
d1515582 | 59 | # define __iomem |
6789ab96 | 60 | # define __percpu BTF_TYPE_TAG(percpu) |
5a0f663f YS |
61 | # define __rcu BTF_TYPE_TAG(rcu) |
62 | ||
25fd529c LVO |
63 | # define __chk_user_ptr(x) (void)0 |
64 | # define __chk_io_ptr(x) (void)0 | |
65 | /* context/locking */ | |
d1515582 WD |
66 | # define __must_hold(x) |
67 | # define __acquires(x) | |
4a557a5d | 68 | # define __cond_acquires(x) |
d1515582 | 69 | # define __releases(x) |
25fd529c LVO |
70 | # define __acquire(x) (void)0 |
71 | # define __release(x) (void)0 | |
d1515582 | 72 | # define __cond_lock(x,c) (c) |
25fd529c LVO |
73 | /* other */ |
74 | # define __force | |
75 | # define __nocast | |
76 | # define __safe | |
d1515582 WD |
77 | # define __private |
78 | # define ACCESS_PRIVATE(p, member) ((p)->member) | |
25fd529c | 79 | # define __builtin_warning(x, y...) (1) |
d1515582 WD |
80 | #endif /* __CHECKER__ */ |
81 | ||
82 | /* Indirect macros required for expanded argument pasting, eg. __LINE__. */ | |
83 | #define ___PASTE(a,b) a##b | |
84 | #define __PASTE(a,b) ___PASTE(a,b) | |
85 | ||
86 | #ifdef __KERNEL__ | |
87 | ||
a3f8a30f MO |
88 | /* Attributes */ |
89 | #include <linux/compiler_attributes.h> | |
90 | ||
c27cd083 MR |
91 | #if CONFIG_FUNCTION_ALIGNMENT > 0 |
92 | #define __function_aligned __aligned(CONFIG_FUNCTION_ALIGNMENT) | |
93 | #else | |
94 | #define __function_aligned | |
95 | #endif | |
96 | ||
97 | /* | |
98 | * gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-cold-function-attribute | |
99 | * gcc: https://gcc.gnu.org/onlinedocs/gcc/Label-Attributes.html#index-cold-label-attribute | |
100 | * | |
101 | * When -falign-functions=N is in use, we must avoid the cold attribute as | |
5270316c PP |
102 | * GCC drops the alignment for cold functions. Worse, GCC can implicitly mark |
103 | * callees of cold functions as cold themselves, so it's not sufficient to add | |
104 | * __function_aligned here as that will not ensure that callees are correctly | |
105 | * aligned. | |
c27cd083 MR |
106 | * |
107 | * See: | |
108 | * | |
109 | * https://lore.kernel.org/lkml/Y77%2FqVgvaJidFpYt@FVFF77S0Q05N | |
110 | * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88345#c9 | |
111 | */ | |
5270316c | 112 | #if defined(CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT) || (CONFIG_FUNCTION_ALIGNMENT == 0) |
c27cd083 MR |
113 | #define __cold __attribute__((__cold__)) |
114 | #else | |
115 | #define __cold | |
116 | #endif | |
117 | ||
7a0fd5e1 ME |
118 | /* |
119 | * On x86-64 and arm64 targets, __preserve_most changes the calling convention | |
120 | * of a function to make the code in the caller as unintrusive as possible. This | |
121 | * convention behaves identically to the C calling convention on how arguments | |
122 | * and return values are passed, but uses a different set of caller- and callee- | |
123 | * saved registers. | |
124 | * | |
125 | * The purpose is to alleviates the burden of saving and recovering a large | |
126 | * register set before and after the call in the caller. This is beneficial for | |
127 | * rarely taken slow paths, such as error-reporting functions that may be called | |
128 | * from hot paths. | |
129 | * | |
130 | * Note: This may conflict with instrumentation inserted on function entry which | |
131 | * does not use __preserve_most or equivalent convention (if in assembly). Since | |
132 | * function tracing assumes the normal C calling convention, where the attribute | |
133 | * is supported, __preserve_most implies notrace. It is recommended to restrict | |
134 | * use of the attribute to functions that should or already disable tracing. | |
135 | * | |
136 | * Optional: not supported by gcc. | |
137 | * | |
138 | * clang: https://clang.llvm.org/docs/AttributeReference.html#preserve-most | |
139 | */ | |
140 | #if __has_attribute(__preserve_most__) && (defined(CONFIG_X86_64) || defined(CONFIG_ARM64)) | |
141 | # define __preserve_most notrace __attribute__((__preserve_most__)) | |
142 | #else | |
143 | # define __preserve_most | |
144 | #endif | |
145 | ||
0a5d3258 TA |
146 | /* |
147 | * Annotating a function/variable with __retain tells the compiler to place | |
148 | * the object in its own section and set the flag SHF_GNU_RETAIN. This flag | |
149 | * instructs the linker to retain the object during garbage-cleanup or LTO | |
150 | * phases. | |
151 | * | |
152 | * Note that the __used macro is also used to prevent functions or data | |
153 | * being optimized out, but operates at the compiler/IR-level and may still | |
154 | * allow unintended removal of objects during linking. | |
155 | * | |
156 | * Optional: only supported since gcc >= 11, clang >= 13 | |
157 | * | |
158 | * gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-retain-function-attribute | |
159 | * clang: https://clang.llvm.org/docs/AttributeReference.html#retain | |
160 | */ | |
161 | #if __has_attribute(__retain__) && \ | |
162 | (defined(CONFIG_LD_DEAD_CODE_DATA_ELIMINATION) || \ | |
163 | defined(CONFIG_LTO_CLANG)) | |
164 | # define __retain __attribute__((__retain__)) | |
165 | #else | |
166 | # define __retain | |
167 | #endif | |
168 | ||
815f0ddb | 169 | /* Compiler specific macros. */ |
d1515582 WD |
170 | #ifdef __clang__ |
171 | #include <linux/compiler-clang.h> | |
815f0ddb ND |
172 | #elif defined(__GNUC__) |
173 | /* The above compilers also define __GNUC__, so order is important here. */ | |
174 | #include <linux/compiler-gcc.h> | |
175 | #else | |
176 | #error "Unknown compiler" | |
d1515582 WD |
177 | #endif |
178 | ||
04f264d3 PB |
179 | /* |
180 | * Some architectures need to provide custom definitions of macros provided | |
181 | * by linux/compiler-*.h, and can do so using asm/compiler.h. We include that | |
182 | * conditionally rather than using an asm-generic wrapper in order to avoid | |
183 | * build failures if any C compilation, which will include this file via an | |
184 | * -include argument in c_flags, occurs prior to the asm-generic wrappers being | |
185 | * generated. | |
186 | */ | |
187 | #ifdef CONFIG_HAVE_ARCH_COMPILER_H | |
188 | #include <asm/compiler.h> | |
189 | #endif | |
190 | ||
d1515582 WD |
191 | struct ftrace_branch_data { |
192 | const char *func; | |
193 | const char *file; | |
194 | unsigned line; | |
195 | union { | |
196 | struct { | |
197 | unsigned long correct; | |
198 | unsigned long incorrect; | |
199 | }; | |
200 | struct { | |
201 | unsigned long miss; | |
202 | unsigned long hit; | |
203 | }; | |
204 | unsigned long miss_hit[2]; | |
205 | }; | |
206 | }; | |
207 | ||
208 | struct ftrace_likely_data { | |
209 | struct ftrace_branch_data data; | |
210 | unsigned long constant; | |
211 | }; | |
212 | ||
71391bdd XL |
213 | #if defined(CC_USING_HOTPATCH) |
214 | #define notrace __attribute__((hotpatch(0, 0))) | |
2809b392 SS |
215 | #elif defined(CC_USING_PATCHABLE_FUNCTION_ENTRY) |
216 | #define notrace __attribute__((patchable_function_entry(0, 0))) | |
71391bdd XL |
217 | #else |
218 | #define notrace __attribute__((__no_instrument_function__)) | |
219 | #endif | |
220 | ||
221 | /* | |
222 | * it doesn't make sense on ARM (currently the only user of __naked) | |
223 | * to trace naked functions because then mcount is called without | |
224 | * stack and frame pointer being set up and there is no chance to | |
225 | * restore the lr register to the value before mcount was called. | |
226 | */ | |
227 | #define __naked __attribute__((__naked__)) notrace | |
228 | ||
71391bdd | 229 | /* |
71391bdd XL |
230 | * Prefer gnu_inline, so that extern inline functions do not emit an |
231 | * externally visible function. This makes extern inline behave as per gnu89 | |
232 | * semantics rather than c99. This prevents multiple symbol definition errors | |
233 | * of extern inline functions at link time. | |
234 | * A lot of inline functions can cause havoc with function tracing. | |
71391bdd | 235 | */ |
889b3c12 | 236 | #define inline inline __gnu_inline __inline_maybe_unused notrace |
71391bdd | 237 | |
c30724e9 RV |
238 | /* |
239 | * gcc provides both __inline__ and __inline as alternate spellings of | |
240 | * the inline keyword, though the latter is undocumented. New kernel | |
241 | * code should only use the inline spelling, but some existing code | |
242 | * uses __inline__. Since we #define inline above, to ensure | |
243 | * __inline__ has the same semantics, we need this #define. | |
244 | * | |
245 | * However, the spelling __inline is strictly reserved for referring | |
246 | * to the bare keyword. | |
247 | */ | |
71391bdd | 248 | #define __inline__ inline |
71391bdd | 249 | |
6863f564 MY |
250 | /* |
251 | * GCC does not warn about unused static inline functions for -Wunused-function. | |
252 | * Suppress the warning in clang as well by using __maybe_unused, but enable it | |
253 | * for W=1 build. This will allow clang to find unused functions. Remove the | |
254 | * __inline_maybe_unused entirely after fixing most of -Wunused-function warnings. | |
255 | */ | |
256 | #ifdef KBUILD_EXTRA_WARN1 | |
257 | #define __inline_maybe_unused | |
258 | #else | |
259 | #define __inline_maybe_unused __maybe_unused | |
260 | #endif | |
261 | ||
71391bdd XL |
262 | /* |
263 | * Rather then using noinline to prevent stack consumption, use | |
264 | * noinline_for_stack instead. For documentation reasons. | |
265 | */ | |
266 | #define noinline_for_stack noinline | |
267 | ||
1f44328e ME |
268 | /* |
269 | * Sanitizer helper attributes: Because using __always_inline and | |
270 | * __no_sanitize_* conflict, provide helper attributes that will either expand | |
271 | * to __no_sanitize_* in compilation units where instrumentation is enabled | |
272 | * (__SANITIZE_*__), or __always_inline in compilation units without | |
273 | * instrumentation (__SANITIZE_*__ undefined). | |
274 | */ | |
275 | #ifdef __SANITIZE_ADDRESS__ | |
eb73876c ME |
276 | /* |
277 | * We can't declare function 'inline' because __no_sanitize_address conflicts | |
278 | * with inlining. Attempt to inline it may cause a build failure. | |
279 | * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67368 | |
280 | * '__maybe_unused' allows us to avoid defined-but-not-used warnings. | |
281 | */ | |
282 | # define __no_kasan_or_inline __no_sanitize_address notrace __maybe_unused | |
283 | # define __no_sanitize_or_inline __no_kasan_or_inline | |
284 | #else | |
285 | # define __no_kasan_or_inline __always_inline | |
286 | #endif | |
287 | ||
eb73876c | 288 | #ifdef __SANITIZE_THREAD__ |
bd3d5bd1 ME |
289 | /* |
290 | * Clang still emits instrumentation for __tsan_func_{entry,exit}() and builtin | |
291 | * atomics even with __no_sanitize_thread (to avoid false positives in userspace | |
292 | * ThreadSanitizer). The kernel's requirements are stricter and we really do not | |
293 | * want any instrumentation with __no_kcsan. | |
294 | * | |
295 | * Therefore we add __disable_sanitizer_instrumentation where available to | |
296 | * disable all instrumentation. See Kconfig.kcsan where this is mandatory. | |
297 | */ | |
298 | # define __no_kcsan __no_sanitize_thread __disable_sanitizer_instrumentation | |
31f605a3 ME |
299 | /* |
300 | * Type qualifier to mark variables where all data-racy accesses should be | |
301 | * ignored by KCSAN. Note, the implementation simply marks these variables as | |
302 | * volatile, since KCSAN will treat such accesses as "marked". | |
303 | */ | |
304 | # define __data_racy volatile | |
e79302ae | 305 | # define __no_sanitize_or_inline __no_kcsan notrace __maybe_unused |
bd3d5bd1 ME |
306 | #else |
307 | # define __no_kcsan | |
31f605a3 | 308 | # define __data_racy |
eb73876c ME |
309 | #endif |
310 | ||
90d1f14c AP |
311 | #ifdef __SANITIZE_MEMORY__ |
312 | /* | |
313 | * Similarly to KASAN and KCSAN, KMSAN loses function attributes of inlined | |
314 | * functions, therefore disabling KMSAN checks also requires disabling inlining. | |
315 | * | |
316 | * __no_sanitize_or_inline effectively prevents KMSAN from reporting errors | |
317 | * within the function and marks all its outputs as initialized. | |
318 | */ | |
319 | # define __no_sanitize_or_inline __no_kmsan_checks notrace __maybe_unused | |
320 | #endif | |
321 | ||
eb73876c ME |
322 | #ifndef __no_sanitize_or_inline |
323 | #define __no_sanitize_or_inline __always_inline | |
324 | #endif | |
325 | ||
ca7e324e AL |
326 | /* |
327 | * Apply __counted_by() when the Endianness matches to increase test coverage. | |
328 | */ | |
329 | #ifdef __LITTLE_ENDIAN | |
330 | #define __counted_by_le(member) __counted_by(member) | |
331 | #define __counted_by_be(member) | |
332 | #else | |
333 | #define __counted_by_le(member) | |
334 | #define __counted_by_be(member) __counted_by(member) | |
335 | #endif | |
336 | ||
557f8c58 KC |
337 | /* Do not trap wrapping arithmetic within an annotated function. */ |
338 | #ifdef CONFIG_UBSAN_SIGNED_WRAP | |
339 | # define __signed_wrap __attribute__((no_sanitize("signed-integer-overflow"))) | |
340 | #else | |
341 | # define __signed_wrap | |
342 | #endif | |
343 | ||
5ddbc408 | 344 | /* Section for code which can't be instrumented at all */ |
2b5a0e42 PZ |
345 | #define __noinstr_section(section) \ |
346 | noinline notrace __attribute((__section__(section))) \ | |
5de0ce85 | 347 | __no_kcsan __no_sanitize_address __no_profile __no_sanitize_coverage \ |
557f8c58 | 348 | __no_sanitize_memory __signed_wrap |
5ddbc408 | 349 | |
2b5a0e42 PZ |
350 | #define noinstr __noinstr_section(".noinstr.text") |
351 | ||
0e985e9d PZ |
352 | /* |
353 | * The __cpuidle section is used twofold: | |
354 | * | |
355 | * 1) the original use -- identifying if a CPU is 'stuck' in idle state based | |
356 | * on it's instruction pointer. See cpu_in_idle(). | |
357 | * | |
358 | * 2) supressing instrumentation around where cpuidle disables RCU; where the | |
359 | * function isn't strictly required for #1, this is interchangeable with | |
360 | * noinstr. | |
361 | */ | |
2b5a0e42 PZ |
362 | #define __cpuidle __noinstr_section(".cpuidle.text") |
363 | ||
d1515582 WD |
364 | #endif /* __KERNEL__ */ |
365 | ||
815f0ddb ND |
366 | #endif /* __ASSEMBLY__ */ |
367 | ||
d1515582 | 368 | /* |
815f0ddb ND |
369 | * The below symbols may be defined for one or more, but not ALL, of the above |
370 | * compilers. We don't consider that to be an error, so set them to nothing. | |
371 | * For example, some of them are for compiler specific plugins. | |
d1515582 | 372 | */ |
d1515582 WD |
373 | #ifndef __latent_entropy |
374 | # define __latent_entropy | |
375 | #endif | |
376 | ||
595b893e KC |
377 | #if defined(RANDSTRUCT) && !defined(__CHECKER__) |
378 | # define __randomize_layout __designated_init __attribute__((randomize_layout)) | |
379 | # define __no_randomize_layout __attribute__((no_randomize_layout)) | |
380 | /* This anon struct can add padding, so only enable it under randstruct. */ | |
381 | # define randomized_struct_fields_start struct { | |
382 | # define randomized_struct_fields_end } __randomize_layout; | |
383 | #else | |
d1515582 | 384 | # define __randomize_layout __designated_init |
d1515582 | 385 | # define __no_randomize_layout |
d1515582 WD |
386 | # define randomized_struct_fields_start |
387 | # define randomized_struct_fields_end | |
388 | #endif | |
389 | ||
d08b9f0c ST |
390 | #ifndef __noscs |
391 | # define __noscs | |
392 | #endif | |
393 | ||
cf68fffb ST |
394 | #ifndef __nocfi |
395 | # define __nocfi | |
396 | #endif | |
397 | ||
86cffecd KC |
398 | /* |
399 | * Any place that could be marked with the "alloc_size" attribute is also | |
9ed9cac1 KC |
400 | * a place to be marked with the "malloc" attribute, except those that may |
401 | * be performing a _reallocation_, as that may alias the existing pointer. | |
402 | * For these, use __realloc_size(). | |
86cffecd KC |
403 | */ |
404 | #ifdef __alloc_size__ | |
405 | # define __alloc_size(x, ...) __alloc_size__(x, ## __VA_ARGS__) __malloc | |
9ed9cac1 | 406 | # define __realloc_size(x, ...) __alloc_size__(x, ## __VA_ARGS__) |
86cffecd KC |
407 | #else |
408 | # define __alloc_size(x, ...) __malloc | |
9ed9cac1 | 409 | # define __realloc_size(x, ...) |
86cffecd KC |
410 | #endif |
411 | ||
26dd68d2 PK |
412 | /* |
413 | * When the size of an allocated object is needed, use the best available | |
414 | * mechanism to find it. (For cases where sizeof() cannot be used.) | |
415 | */ | |
416 | #if __has_builtin(__builtin_dynamic_object_size) | |
417 | #define __struct_size(p) __builtin_dynamic_object_size(p, 0) | |
418 | #define __member_size(p) __builtin_dynamic_object_size(p, 1) | |
419 | #else | |
420 | #define __struct_size(p) __builtin_object_size(p, 0) | |
421 | #define __member_size(p) __builtin_object_size(p, 1) | |
422 | #endif | |
423 | ||
559048d1 KC |
424 | /* Determine if an attribute has been applied to a variable. */ |
425 | #if __has_builtin(__builtin_has_attribute) | |
426 | #define __annotated(var, attr) __builtin_has_attribute(var, attr) | |
427 | #else | |
428 | #define __annotated(var, attr) (false) | |
429 | #endif | |
430 | ||
68fb3ca0 LT |
431 | /* |
432 | * Some versions of gcc do not mark 'asm goto' volatile: | |
433 | * | |
434 | * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103979 | |
435 | * | |
436 | * We do it here by hand, because it doesn't hurt. | |
437 | */ | |
4356e9f8 | 438 | #ifndef asm_goto_output |
68fb3ca0 | 439 | #define asm_goto_output(x...) asm volatile goto(x) |
8bd66d14 | 440 | #endif |
441 | ||
dbaaabd6 LT |
442 | /* |
443 | * Clang has trouble with constraints with multiple | |
444 | * alternative behaviors (mainly "g" and "rm"). | |
445 | */ | |
446 | #ifndef ASM_INPUT_G | |
447 | #define ASM_INPUT_G "g" | |
448 | #define ASM_INPUT_RM "rm" | |
449 | #endif | |
450 | ||
eb111869 RV |
451 | #ifdef CONFIG_CC_HAS_ASM_INLINE |
452 | #define asm_inline asm __inline | |
453 | #else | |
454 | #define asm_inline asm | |
455 | #endif | |
456 | ||
d1515582 | 457 | /* Are two types/vars the same type (ignoring qualifiers)? */ |
815f0ddb | 458 | #define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b)) |
d1515582 | 459 | |
dee081bf WD |
460 | /* |
461 | * __unqual_scalar_typeof(x) - Declare an unqualified scalar type, leaving | |
462 | * non-scalar types unchanged. | |
1fd76043 | 463 | */ |
1fd76043 | 464 | /* |
6ec4476a | 465 | * Prefer C11 _Generic for better compile-times and simpler code. Note: 'char' |
1fd76043 ME |
466 | * is not type-compatible with 'signed char', and we define a separate case. |
467 | */ | |
468 | #define __scalar_type_to_expr_cases(type) \ | |
469 | unsigned type: (unsigned type)0, \ | |
470 | signed type: (signed type)0 | |
471 | ||
472 | #define __unqual_scalar_typeof(x) typeof( \ | |
473 | _Generic((x), \ | |
474 | char: (char)0, \ | |
475 | __scalar_type_to_expr_cases(char), \ | |
476 | __scalar_type_to_expr_cases(short), \ | |
477 | __scalar_type_to_expr_cases(int), \ | |
478 | __scalar_type_to_expr_cases(long), \ | |
479 | __scalar_type_to_expr_cases(long long), \ | |
480 | default: (x))) | |
dee081bf | 481 | |
d1515582 | 482 | /* Is this type a native word size -- useful for atomic operations */ |
815f0ddb ND |
483 | #define __native_word(t) \ |
484 | (sizeof(t) == sizeof(char) || sizeof(t) == sizeof(short) || \ | |
485 | sizeof(t) == sizeof(int) || sizeof(t) == sizeof(long)) | |
486 | ||
eb5c2d4b WD |
487 | #ifdef __OPTIMIZE__ |
488 | # define __compiletime_assert(condition, msg, prefix, suffix) \ | |
489 | do { \ | |
7c00621d MO |
490 | /* \ |
491 | * __noreturn is needed to give the compiler enough \ | |
492 | * information to avoid certain possibly-uninitialized \ | |
493 | * warnings (regardless of the build failing). \ | |
494 | */ \ | |
495 | __noreturn extern void prefix ## suffix(void) \ | |
496 | __compiletime_error(msg); \ | |
eb5c2d4b WD |
497 | if (!(condition)) \ |
498 | prefix ## suffix(); \ | |
499 | } while (0) | |
500 | #else | |
501 | # define __compiletime_assert(condition, msg, prefix, suffix) do { } while (0) | |
502 | #endif | |
503 | ||
504 | #define _compiletime_assert(condition, msg, prefix, suffix) \ | |
505 | __compiletime_assert(condition, msg, prefix, suffix) | |
506 | ||
507 | /** | |
508 | * compiletime_assert - break build and emit msg if condition is false | |
509 | * @condition: a compile-time constant condition to check | |
510 | * @msg: a message to emit if condition is false | |
511 | * | |
512 | * In tradition of POSIX assert, this macro will break the build if the | |
513 | * supplied condition is *false*, emitting the supplied error message if the | |
514 | * compiler has support to do so. | |
515 | */ | |
516 | #define compiletime_assert(condition, msg) \ | |
517 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) | |
518 | ||
519 | #define compiletime_assert_atomic_type(t) \ | |
520 | compiletime_assert(__native_word(t), \ | |
521 | "Need native word sized stores/loads for atomicity.") | |
522 | ||
815f0ddb | 523 | /* Helpers for emitting diagnostics in pragmas. */ |
8793bb7f AB |
524 | #ifndef __diag |
525 | #define __diag(string) | |
526 | #endif | |
527 | ||
528 | #ifndef __diag_GCC | |
529 | #define __diag_GCC(version, severity, string) | |
530 | #endif | |
531 | ||
532 | #define __diag_push() __diag(push) | |
533 | #define __diag_pop() __diag(pop) | |
534 | ||
535 | #define __diag_ignore(compiler, version, option, comment) \ | |
536 | __diag_ ## compiler(version, ignore, option) | |
537 | #define __diag_warn(compiler, version, option, comment) \ | |
538 | __diag_ ## compiler(version, warn, option) | |
539 | #define __diag_error(compiler, version, option, comment) \ | |
540 | __diag_ ## compiler(version, error, option) | |
541 | ||
4d1ea705 KKD |
542 | #ifndef __diag_ignore_all |
543 | #define __diag_ignore_all(option, comment) | |
544 | #endif | |
545 | ||
d1515582 | 546 | #endif /* __LINUX_COMPILER_TYPES_H */ |