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_ */ 653