1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1991, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Berkeley Software Design, Inc.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#ifndef _SYS_CDEFS_H_
36#define _SYS_CDEFS_H_
37
38#if defined(_KERNEL) && defined(_STANDALONE)
39#error "_KERNEL and _STANDALONE are mutually exclusive"
40#endif
41
42/*
43 * Provide clang-compatible testing macros. All supported versions of gcc (10+)
44 * provide all of these except has_feature and has_extension which are new in
45 * gcc 14. Keep the older ifndefs, though, for non-gcc compilers that may lack
46 * them like tcc and pcc.
47 */
48#ifndef __has_attribute
49#define __has_attribute(x) 0
50#endif
51#ifndef __has_extension
52#define __has_extension __has_feature
53#endif
54#ifndef __has_feature
55#define __has_feature(x) 0
56#endif
57#ifndef __has_include
58#define __has_include(x) 0
59#endif
60#ifndef __has_builtin
61#define __has_builtin(x) 0
62#endif
63
64#if defined(__cplusplus)
65#define __BEGIN_DECLS extern "C" {
66#define __END_DECLS }
67#else
68#define __BEGIN_DECLS
69#define __END_DECLS
70#endif
71
72/*
73 * This code has been put in place to help reduce the addition of
74 * compiler specific defines in FreeBSD code. It helps to aid in
75 * having a compiler-agnostic source tree.
76 */
77
78/*
79 * Macro to test if we're using a specific version of gcc or later.
80 */
81#if defined(__GNUC__)
82#define __GNUC_PREREQ__(ma, mi) \
83 (__GNUC__ > (ma) || __GNUC__ == (ma) && __GNUC_MINOR__ >= (mi))
84#else
85#define __GNUC_PREREQ__(ma, mi) 0
86#endif
87
88#if defined(__GNUC__)
89
90/*
91 * Compiler memory barriers, specific to gcc and clang.
92 */
93#define __compiler_membar() __asm __volatile(" " : : : "memory")
94
95#define __CC_SUPPORTS___INLINE 1
96#define __CC_SUPPORTS_SYMVER 1
97
98#endif /* __GNUC__ */
99
100/*
101 * TinyC pretends to be gcc 9.3. This is generally good enough to support
102 * everything FreeBSD... except for the .symver assembler directive.
103 */
104#ifdef __TINYC__
105#undef __CC_SUPPORTS_SYMVER
106#endif
107
108/*
109 * The __CONCAT macro is used to concatenate parts of symbol names, e.g.
110 * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
111 * The __CONCAT macro is a bit tricky to use if it must work in non-ANSI
112 * mode -- there must be no spaces between its arguments, and for nested
113 * __CONCAT's, all the __CONCAT's must be at the left. __CONCAT can also
114 * concatenate double-quoted strings produced by the __STRING macro, but
115 * this only works with ANSI C.
116 *
117 * __XSTRING is like __STRING, but it expands any macros in its argument
118 * first. It is only available with ANSI C.
119 */
120#if defined(__STDC__) || defined(__cplusplus)
121#define __P(protos) protos /* full-blown ANSI C */
122#define __CONCAT1(x,y) x ## y
123#define __CONCAT(x,y) __CONCAT1(x,y)
124#define __STRING(x) #x /* stringify without expanding x */
125#define __XSTRING(x) __STRING(x) /* expand x, then stringify */
126
127#define __volatile volatile
128#if defined(__cplusplus)
129#define __inline inline /* convert to C++ keyword */
130#else
131#if !(defined(__CC_SUPPORTS___INLINE))
132#define __inline /* delete GCC keyword */
133#endif /* ! __CC_SUPPORTS___INLINE */
134#endif /* !__cplusplus */
135
136#else /* !(__STDC__ || __cplusplus) */
137#define __P(protos) () /* traditional C preprocessor */
138#define __CONCAT(x,y) x/**/y
139#define __STRING(x) "x"
140#if !defined(__CC_SUPPORTS___INLINE)
141/* Just delete these in a K&R environment */
142#define __inline
143#define __volatile
144#endif /* !__CC_SUPPORTS___INLINE */
145#endif /* !(__STDC__ || __cplusplus) */
146
147/*
148 * Compiler-dependent macros to help declare dead (non-returning) and pure (no
149 * side effects) functions, and unused variables. These attributes are supported
150 * by all current compilers, even pcc.
151 */
152#define __weak_symbol __attribute__((__weak__))
153#define __dead2 __attribute__((__noreturn__))
154#define __pure2 __attribute__((__const__))
155#define __unused __attribute__((__unused__))
156#define __used __attribute__((__used__))
157#define __deprecated __attribute__((__deprecated__))
158#define __deprecated1(msg) __attribute__((__deprecated__(msg)))
159#define __packed __attribute__((__packed__))
160#define __aligned(x) __attribute__((__aligned__(x)))
161#define __section(x) __attribute__((__section__(x)))
162#define __writeonly __unused
163#define __alloc_size(x) __attribute__((__alloc_size__(x)))
164#define __alloc_size2(n, x) __attribute__((__alloc_size__(n, x)))
165#define __alloc_align(x) __attribute__((__alloc_align__(x)))
166
167/*
168 * Keywords added in C11.
169 */
170
171#if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 201112L
172
173#if !__has_extension(c_alignas)
174#if (defined(__cplusplus) && __cplusplus >= 201103L) || \
175 __has_extension(cxx_alignas)
176#define _Alignas(x) alignas(x)
177#else
178/* XXX: Only emulates _Alignas(constant-expression); not _Alignas(type-name). */
179#define _Alignas(x) __aligned(x)
180#endif
181#endif
182
183#if defined(__cplusplus) && __cplusplus >= 201103L
184#define _Alignof(x) alignof(x)
185#else
186#define _Alignof(x) __alignof(x)
187#endif
188
189#if defined(__cplusplus) && __cplusplus >= 201103L
190#define _Noreturn [[noreturn]]
191#else
192#define _Noreturn __dead2
193#endif
194
195#if !__has_extension(c_static_assert)
196#if (defined(__cplusplus) && __cplusplus >= 201103L) || \
197 __has_extension(cxx_static_assert)
198#define _Static_assert(x, y) static_assert(x, y)
199#endif
200#endif
201
202#if !__has_extension(c_thread_local)
203#if (defined(__cplusplus) && __cplusplus >= 201103L) || \
204 __has_extension(cxx_thread_local)
205#define _Thread_local thread_local
206#else
207#define _Thread_local __thread
208#endif
209#endif
210
211#endif /* __STDC_VERSION__ || __STDC_VERSION__ < 201112L */
212
213/*
214 * Emulation of C11 _Generic(). Unlike the previously defined C11
215 * keywords, it is not possible to implement this using exactly the same
216 * syntax. Therefore implement something similar under the name
217 * __generic(). Unlike _Generic(), this macro can only distinguish
218 * between a single type, so it requires nested invocations to
219 * distinguish multiple cases.
220 *
221 * Note that the comma operator is used to force expr to decay in
222 * order to match _Generic().
223 */
224
225#if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) || \
226 __has_extension(c_generic_selections)
227#define __generic(expr, t, yes, no) \
228 _Generic(expr, t: yes, default: no)
229#elif !defined(__cplusplus)
230#define __generic(expr, t, yes, no) \
231 __builtin_choose_expr(__builtin_types_compatible_p( \
232 __typeof(((void)0, (expr))), t), yes, no)
233#endif
234
235/*
236 * C99 Static array indices in function parameter declarations. Syntax such as:
237 * void bar(int myArray[static 10]);
238 * is allowed in C99 but not in C++. Define __min_size appropriately so
239 * headers using it can be compiled in either language. Use like this:
240 * void bar(int myArray[__min_size(10)]);
241 */
242#if !defined(__cplusplus) && \
243 (!defined(__STDC_VERSION__) || (__STDC_VERSION__ >= 199901))
244#define __min_size(x) static (x)
245#else
246#define __min_size(x) (x)
247#endif
248
249#define __malloc_like __attribute__((__malloc__))
250#define __pure __attribute__((__pure__))
251
252#define __always_inline __inline __attribute__((__always_inline__))
253#define __noinline __attribute__ ((__noinline__))
254#define __fastcall __attribute__((__fastcall__))
255#define __result_use_check __attribute__((__warn_unused_result__))
256#define __returns_twice __attribute__((__returns_twice__))
257
258#define __unreachable() __builtin_unreachable()
259
260#if !defined(__STRICT_ANSI__) || __STDC_VERSION__ >= 199901
261#define __LONG_LONG_SUPPORTED
262#endif
263
264/* C++11 exposes a load of C99 stuff */
265#if defined(__cplusplus) && __cplusplus >= 201103L
266#define __LONG_LONG_SUPPORTED
267#ifndef __STDC_LIMIT_MACROS
268#define __STDC_LIMIT_MACROS
269#endif
270#ifndef __STDC_CONSTANT_MACROS
271#define __STDC_CONSTANT_MACROS
272#endif
273#endif
274
275/*
276 * noexcept keyword added in C++11.
277 */
278#if defined(__cplusplus) && __cplusplus >= 201103L
279#define __noexcept noexcept
280#define __noexcept_if(__c) noexcept(__c)
281#else
282#define __noexcept
283#define __noexcept_if(__c)
284#endif
285
286/*
287 * nodiscard attribute added in C++17 and C23, but supported by both LLVM and
288 * GCC in earlier language versions, so we use __has_c{,pp}_attribute to test
289 * for it.
290 *
291 * __nodiscard may be used on a function:
292 * __nodiscard int f();
293 *
294 * or on a struct, union or enum:
295 * struct __nodiscard S{};
296 * struct S f();
297 *
298 * or in C++, on an object constructor.
299 */
300
301#if defined(__cplusplus) && defined(__has_cpp_attribute)
302#if __has_cpp_attribute(nodiscard)
303#define __nodiscard [[nodiscard]]
304#endif
305#elif defined(__STDC_VERSION__) && defined(__has_c_attribute)
306#if __has_c_attribute(__nodiscard__)
307#define __nodiscard [[__nodiscard__]]
308#endif
309#endif
310
311#ifndef __nodiscard
312/*
313 * LLVM 16 and earlier don't support [[nodiscard]] in C, but they do support
314 * __warn_unused_result__ with the same semantics, so fall back to that.
315 * We can't do this for GCC because the semantics are different.
316 */
317#ifdef __clang__
318#define __nodiscard __attribute__((__warn_unused_result__))
319#else
320#define __nodiscard
321#endif
322#endif
323
324/*
325 * We use `__restrict' as a way to define the `restrict' type qualifier
326 * without disturbing older software that is unaware of C99 keywords.
327 * GCC also provides `__restrict' as an extension to support C99-style
328 * restricted pointers in other language modes.
329 */
330#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901
331#define __restrict restrict
332#endif
333
334/*
335 * All modern compilers have explicit branch prediction so that the CPU back-end
336 * can hint to the processor and also so that code blocks can be reordered such
337 * that the predicted path sees a more linear flow, thus improving cache
338 * behavior, etc. Use sparingly, except in performance critical code where
339 * they make things measurably faster.
340 */
341#define __predict_true(exp) __builtin_expect((exp), 1)
342#define __predict_false(exp) __builtin_expect((exp), 0)
343
344#define __null_sentinel __attribute__((__sentinel__))
345#define __exported __attribute__((__visibility__("default")))
346#define __hidden __attribute__((__visibility__("hidden")))
347
348/*
349 * We define this here since <stddef.h>, <sys/queue.h>, and <sys/types.h>
350 * require it.
351 */
352#define __offsetof(type, field) __builtin_offsetof(type, field)
353#define __rangeof(type, start, end) \
354 (__offsetof(type, end) - __offsetof(type, start))
355
356/*
357 * Given the pointer x to the member m of the struct s, return
358 * a pointer to the containing structure. When using GCC, we first
359 * assign pointer x to a local variable, to check that its type is
360 * compatible with member m.
361 */
362#define __containerof(x, s, m) ({ \
363 const volatile __typeof(((s *)0)->m) *__x = (x); \
364 __DEQUALIFY(s *, (const volatile char *)__x - __offsetof(s, m));\
365})
366
367/*
368 * Compiler-dependent macros to declare that functions take printf-like
369 * or scanf-like arguments.
370 */
371#define __printflike(fmtarg, firstvararg) \
372 __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
373#define __scanflike(fmtarg, firstvararg) \
374 __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
375#define __format_arg(fmtarg) __attribute__((__format_arg__ (fmtarg)))
376#define __strfmonlike(fmtarg, firstvararg) \
377 __attribute__((__format__ (__strfmon__, fmtarg, firstvararg)))
378#define __strftimelike(fmtarg, firstvararg) \
379 __attribute__((__format__ (__strftime__, fmtarg, firstvararg)))
380
381/*
382 * Like __printflike, but allows fmtarg to be NULL. FreeBSD invented 'printf0'
383 * for this because older versions of gcc issued warnings for NULL first args.
384 * Clang has always had printf and printf0 as aliases. gcc 11.0 now follows
385 * clang. So now this is an alias for __printflike, or nothing. In the future
386 * _Nullable or _Nonnull will replace this.
387 * XXX Except that doesn't work, so for now revert to printf0 for clang and
388 * the FreeBSD gcc until I can work this out.
389 */
390#if defined(__clang__) || (defined(__GNUC__) && defined (__FreeBSD_cc_version))
391#define __printf0like(fmtarg, firstvararg) \
392 __attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
393#else
394#define __printf0like(fmtarg, firstvararg)
395#endif
396
397#define __strong_reference(sym,aliassym) \
398 extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)))
399#ifdef __STDC__
400#define __weak_reference(sym,alias) \
401 __asm__(".weak " #alias); \
402 __asm__(".equ " #alias ", " #sym)
403#define __warn_references(sym,msg) \
404 __asm__(".section .gnu.warning." #sym); \
405 __asm__(".asciz \"" msg "\""); \
406 __asm__(".previous")
407#ifdef __CC_SUPPORTS_SYMVER
408#define __sym_compat(sym,impl,verid) \
409 __asm__(".symver " #impl ", " #sym "@" #verid)
410#define __sym_default(sym,impl,verid) \
411 __asm__(".symver " #impl ", " #sym "@@@" #verid)
412#endif
413#else
414#define __weak_reference(sym,alias) \
415 __asm__(".weak alias"); \
416 __asm__(".equ alias, sym")
417#define __warn_references(sym,msg) \
418 __asm__(".section .gnu.warning.sym"); \
419 __asm__(".asciz \"msg\""); \
420 __asm__(".previous")
421#ifdef __CC_SUPPORTS_SYMVER
422#define __sym_compat(sym,impl,verid) \
423 __asm__(".symver impl, sym@verid")
424#define __sym_default(impl,sym,verid) \
425 __asm__(".symver impl, sym@@@verid")
426#endif
427#endif /* __STDC__ */
428
429#define __GLOBL(sym) __asm__(".globl " __XSTRING(sym))
430#define __WEAK(sym) __asm__(".weak " __XSTRING(sym))
431
432#define __IDSTRING(name,string) __asm__(".ident\t\"" string "\"")
433
434/*
435 * Embed the rcs id of a source file in the resulting library. Note that in
436 * more recent ELF binutils, we use .ident allowing the ID to be stripped.
437 * Usage:
438 */
439#ifndef __FBSDID
440#if !defined(STRIP_FBSDID)
441#define __FBSDID(s) __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
442#else
443#define __FBSDID(s) struct __hack
444#endif
445#endif
446
447#ifndef __RCSID
448#ifndef NO__RCSID
449#define __RCSID(s) __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
450#else
451#define __RCSID(s) struct __hack
452#endif
453#endif
454
455#ifndef __RCSID_SOURCE
456#ifndef NO__RCSID_SOURCE
457#define __RCSID_SOURCE(s) __IDSTRING(__CONCAT(__rcsid_source_,__LINE__),s)
458#else
459#define __RCSID_SOURCE(s) struct __hack
460#endif
461#endif
462
463#ifndef __SCCSID
464#ifndef NO__SCCSID
465#define __SCCSID(s) __IDSTRING(__CONCAT(__sccsid_,__LINE__),s)
466#else
467#define __SCCSID(s) struct __hack
468#endif
469#endif
470
471#ifndef __COPYRIGHT
472#ifndef NO__COPYRIGHT
473#define __COPYRIGHT(s) __IDSTRING(__CONCAT(__copyright_,__LINE__),s)
474#else
475#define __COPYRIGHT(s) struct __hack
476#endif
477#endif
478
479#ifndef __DECONST
480#define __DECONST(type, var) ((type)(__uintptr_t)(const void *)(var))
481#endif
482
483#ifndef __DEVOLATILE
484#define __DEVOLATILE(type, var) ((type)(__uintptr_t)(volatile void *)(var))
485#endif
486
487#ifndef __DEQUALIFY
488#define __DEQUALIFY(type, var) ((type)(__uintptr_t)(const volatile void *)(var))
489#endif
490
491#if !defined(_STANDALONE) && !defined(_KERNEL)
492#define __RENAME(x) __asm(__STRING(x))
493#else /* _STANDALONE || _KERNEL */
494#define __RENAME(x) no renaming in kernel/standalone environment
495#endif
496
497#include <sys/_visible.h>
498
499/*
500 * Nullability qualifiers: currently only supported by Clang.
501 */
502#if !(defined(__clang__) && __has_feature(nullability))
503#define _Nonnull
504#define _Nullable
505#define _Null_unspecified
506#define __NULLABILITY_PRAGMA_PUSH
507#define __NULLABILITY_PRAGMA_POP
508#else
509#define __NULLABILITY_PRAGMA_PUSH _Pragma("clang diagnostic push") \
510 _Pragma("clang diagnostic ignored \"-Wnullability-completeness\"")
511#define __NULLABILITY_PRAGMA_POP _Pragma("clang diagnostic pop")
512#endif
513
514/*
515 * Type Safety Checking
516 *
517 * Clang provides additional attributes to enable checking type safety
518 * properties that cannot be enforced by the C type system.
519 */
520
521#if __has_attribute(__argument_with_type_tag__) && \
522 __has_attribute(__type_tag_for_datatype__)
523#define __arg_type_tag(arg_kind, arg_idx, type_tag_idx) \
524 __attribute__((__argument_with_type_tag__(arg_kind, arg_idx, type_tag_idx)))
525#define __datatype_type_tag(kind, type) \
526 __attribute__((__type_tag_for_datatype__(kind, type)))
527#else
528#define __arg_type_tag(arg_kind, arg_idx, type_tag_idx)
529#define __datatype_type_tag(kind, type)
530#endif
531
532/*
533 * Lock annotations.
534 *
535 * Clang provides support for doing basic thread-safety tests at
536 * compile-time, by marking which locks will/should be held when
537 * entering/leaving a functions.
538 *
539 * Furthermore, it is also possible to annotate variables and structure
540 * members to enforce that they are only accessed when certain locks are
541 * held.
542 */
543
544#if __has_extension(c_thread_safety_attributes)
545#define __lock_annotate(x) __attribute__((x))
546#else
547#define __lock_annotate(x)
548#endif
549
550/* Structure implements a lock. */
551#define __lockable __lock_annotate(lockable)
552
553/* Function acquires an exclusive or shared lock. */
554#define __locks_exclusive(...) \
555 __lock_annotate(exclusive_lock_function(__VA_ARGS__))
556#define __locks_shared(...) \
557 __lock_annotate(shared_lock_function(__VA_ARGS__))
558
559/* Function attempts to acquire an exclusive or shared lock. */
560#define __trylocks_exclusive(...) \
561 __lock_annotate(exclusive_trylock_function(__VA_ARGS__))
562#define __trylocks_shared(...) \
563 __lock_annotate(shared_trylock_function(__VA_ARGS__))
564
565/* Function releases a lock. */
566#define __unlocks(...) __lock_annotate(unlock_function(__VA_ARGS__))
567
568/* Function asserts that an exclusive or shared lock is held. */
569#define __asserts_exclusive(...) \
570 __lock_annotate(assert_exclusive_lock(__VA_ARGS__))
571#define __asserts_shared(...) \
572 __lock_annotate(assert_shared_lock(__VA_ARGS__))
573
574/* Function requires that an exclusive or shared lock is or is not held. */
575#define __requires_exclusive(...) \
576 __lock_annotate(exclusive_locks_required(__VA_ARGS__))
577#define __requires_shared(...) \
578 __lock_annotate(shared_locks_required(__VA_ARGS__))
579#define __requires_unlocked(...) \
580 __lock_annotate(locks_excluded(__VA_ARGS__))
581
582/* Function should not be analyzed. */
583#define __no_lock_analysis __lock_annotate(no_thread_safety_analysis)
584
585/*
586 * Function or variable should not be sanitized, e.g., by AddressSanitizer.
587 * GCC has the nosanitize attribute, but as a function attribute only, and
588 * warns on use as a variable attribute.
589 */
590#if __has_feature(address_sanitizer) && defined(__clang__)
591#ifdef _KERNEL
592#define __nosanitizeaddress __attribute__((no_sanitize("kernel-address")))
593#else
594#define __nosanitizeaddress __attribute__((no_sanitize("address")))
595#endif
596#else
597#define __nosanitizeaddress
598#endif
599#if __has_feature(coverage_sanitizer) && defined(__clang__)
600#define __nosanitizecoverage __attribute__((no_sanitize("coverage")))
601#else
602#define __nosanitizecoverage
603#endif
604#if __has_feature(memory_sanitizer) && defined(__clang__)
605#ifdef _KERNEL
606#define __nosanitizememory __attribute__((no_sanitize("kernel-memory")))
607#else
608#define __nosanitizememory __attribute__((no_sanitize("memory")))
609#endif
610#else
611#define __nosanitizememory
612#endif
613#if __has_feature(thread_sanitizer) && defined(__clang__)
614#define __nosanitizethread __attribute__((no_sanitize("thread")))
615#else
616#define __nosanitizethread
617#endif
618
619/*
620 * Make it possible to opt out of stack smashing protection.
621 */
622#if __has_attribute(no_stack_protector)
623#define __nostackprotector __attribute__((no_stack_protector))
624#else
625#define __nostackprotector \
626 __attribute__((__optimize__("-fno-stack-protector")))
627#endif
628
629/* Guard variables and structure members by lock. */
630#define __guarded_by(x) __lock_annotate(guarded_by(x))
631#define __pt_guarded_by(x) __lock_annotate(pt_guarded_by(x))
632
633/* Alignment builtins for better type checking and improved code generation. */
634/* Provide fallback versions for other compilers (GCC/Clang < 10): */
635#if !__has_builtin(__builtin_is_aligned)
636#define __builtin_is_aligned(x, align) \
637 (((__uintptr_t)(x) & ((align) - 1)) == 0)
638#endif
639#if !__has_builtin(__builtin_align_up)
640#define __builtin_align_up(x, align) \
641 ((__typeof__(x))(((__uintptr_t)(x)+((align)-1))&(~((align)-1))))
642#endif
643#if !__has_builtin(__builtin_align_down)
644#define __builtin_align_down(x, align) \
645 ((__typeof__(x))((x)&(~((align)-1))))
646#endif
647
648#define __align_up(x, y) __builtin_align_up(x, y)
649#define __align_down(x, y) __builtin_align_down(x, y)
650#define __is_aligned(x, y) __builtin_is_aligned(x, y)
651
652#endif /* !_SYS_CDEFS_H_ */