Meg's Mirrors

zig

1	/*
2	* Copyright (c) 2000-2018 Apple Inc. All rights reserved.
3	*
4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5	*
6	* This file contains Original Code and/or Modifications of Original Code
7	* as defined in and that are subject to the Apple Public Source License
8	* Version 2.0 (the 'License'). You may not use this file except in
9	* compliance with the License. The rights granted to you under the License
10	* may not be used to create, or enable the creation or redistribution of,
11	* unlawful or unlicensed copies of an Apple operating system, or to
12	* circumvent, violate, or enable the circumvention or violation of, any
13	* terms of an Apple operating system software license agreement.
14	*
15	* Please obtain a copy of the License at
16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
17	*
18	* The Original Code and all software distributed under the License are
19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23	* Please see the License for the specific language governing rights and
24	* limitations under the License.
25	*
26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27	*/
28	/* Copyright 1995 NeXT Computer, Inc. All rights reserved. */
29	/*
30	* Copyright (c) 1991, 1993
31	* The Regents of the University of California. All rights reserved.
32	*
33	* This code is derived from software contributed to Berkeley by
34	* Berkeley Software Design, Inc.
35	*
36	* Redistribution and use in source and binary forms, with or without
37	* modification, are permitted provided that the following conditions
38	* are met:
39	* 1. Redistributions of source code must retain the above copyright
40	* notice, this list of conditions and the following disclaimer.
41	* 2. Redistributions in binary form must reproduce the above copyright
42	* notice, this list of conditions and the following disclaimer in the
43	* documentation and/or other materials provided with the distribution.
44	* 3. All advertising materials mentioning features or use of this software
45	* must display the following acknowledgement:
46	* This product includes software developed by the University of
47	* California, Berkeley and its contributors.
48	* 4. Neither the name of the University nor the names of its contributors
49	* may be used to endorse or promote products derived from this software
50	* without specific prior written permission.
51	*
52	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
53	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
54	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
55	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
56	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
57	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
58	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
59	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
60	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
61	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
62	* SUCH DAMAGE.
63	*
64	* @(#)cdefs.h 8.8 (Berkeley) 1/9/95
65	*/
66
67	#ifndef _CDEFS_H_
68	#define _CDEFS_H_
69
70	#if defined(__cplusplus)
71	#define __BEGIN_DECLS extern "C" {
72	#define __END_DECLS }
73	#else
74	#define __BEGIN_DECLS
75	#define __END_DECLS
76	#endif
77
78	/* This SDK is designed to work with clang and specific versions of
79	* gcc >= 4.0 with Apple's patch sets */
80	#if !defined(__GNUC__) || __GNUC__ < 4
81	#warning "Unsupported compiler detected"
82	#endif
83
84	/*
85	* Compatibility with compilers and environments that don't support compiler
86	* feature checking function-like macros.
87	*/
88	#ifndef __has_builtin
89	#define __has_builtin(x) 0
90	#endif
91	#ifndef __has_include
92	#define __has_include(x) 0
93	#endif
94	#ifndef __has_feature
95	#define __has_feature(x) 0
96	#endif
97	#ifndef __has_attribute
98	#define __has_attribute(x) 0
99	#endif
100	#ifndef __has_cpp_attribute
101	#define __has_cpp_attribute(x) 0
102	#endif
103	#ifndef __has_extension
104	#define __has_extension(x) 0
105	#endif
106
107	/*
108	* The __CONCAT macro is used to concatenate parts of symbol names, e.g.
109	* with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
110	* The __CONCAT macro is a bit tricky -- make sure you don't put spaces
111	* in between its arguments. __CONCAT can also concatenate double-quoted
112	* strings produced by the __STRING macro, but this only works with ANSI C.
113	*/
114	#if defined(__STDC__) || defined(__cplusplus)
115	#define __P(protos) protos /* full-blown ANSI C */
116	#define __CONCAT(x, y) x ## y
117	#define __STRING(x) #x
118
119	#define __const const /* define reserved names to standard */
120	#define __signed signed
121	#define __volatile volatile
122	#if defined(__cplusplus)
123	#define __inline inline /* convert to C++ keyword */
124	#else
125	#ifndef __GNUC__
126	#define __inline /* delete GCC keyword */
127	#endif /* !__GNUC__ */
128	#endif /* !__cplusplus */
129
130	#else /* !(__STDC__ || __cplusplus) */
131	#define __P(protos) () /* traditional C preprocessor */
132	#define __CONCAT(x, y) x /**/ y
133	#define __STRING(x) "x"
134
135	#ifndef __GNUC__
136	#define __const /* delete pseudo-ANSI C keywords */
137	#define __inline
138	#define __signed
139	#define __volatile
140	#endif /* !__GNUC__ */
141
142	/*
143	* In non-ANSI C environments, new programs will want ANSI-only C keywords
144	* deleted from the program and old programs will want them left alone.
145	* When using a compiler other than gcc, programs using the ANSI C keywords
146	* const, inline etc. as normal identifiers should define -DNO_ANSI_KEYWORDS.
147	* When using "gcc -traditional", we assume that this is the intent; if
148	* __GNUC__ is defined but __STDC__ is not, we leave the new keywords alone.
149	*/
150	#ifndef NO_ANSI_KEYWORDS
151	#define const __const /* convert ANSI C keywords */
152	#define inline __inline
153	#define signed __signed
154	#define volatile __volatile
155	#endif /* !NO_ANSI_KEYWORDS */
156	#endif /* !(__STDC__ || __cplusplus) */
157
158	/*
159	* __pure2 can be used for functions that are only a function of their scalar
160	* arguments (meaning they can't dereference pointers).
161	*
162	* __stateful_pure can be used for functions that have no side effects,
163	* but depend on the state of the memory.
164	*/
165	#define __dead2 __attribute__((__noreturn__))
166	#define __pure2 __attribute__((__const__))
167	#define __stateful_pure __attribute__((__pure__))
168
169	/* __unused denotes variables and functions that may not be used, preventing
170	* the compiler from warning about it if not used.
171	*/
172	#define __unused __attribute__((__unused__))
173
174	/* __used forces variables and functions to be included even if it appears
175	* to the compiler that they are not used (and would thust be discarded).
176	*/
177	#define __used __attribute__((__used__))
178
179	/* __cold marks code used for debugging or that is rarely taken
180	* and tells the compiler to optimize for size and outline code.
181	*/
182	#if __has_attribute(cold)
183	#define __cold __attribute__((__cold__))
184	#else
185	#define __cold
186	#endif
187
188	/* __returns_nonnull marks functions that return a non-null pointer. */
189	#if __has_attribute(returns_nonnull)
190	#define __returns_nonnull __attribute((returns_nonnull))
191	#else
192	#define __returns_nonnull
193	#endif
194
195	/* __exported denotes symbols that should be exported even when symbols
196	* are hidden by default.
197	* __exported_push/_exported_pop are pragmas used to delimit a range of
198	* symbols that should be exported even when symbols are hidden by default.
199	*/
200	#define __exported __attribute__((__visibility__("default")))
201	#define __exported_push _Pragma("GCC visibility push(default)")
202	#ifndef __BUILDING_XNU_LIBRARY__
203	#define __exported_push_hidden _Pragma("GCC visibility push(hidden)")
204	#define __exported_pop _Pragma("GCC visibility pop")
205	#define __exported_hidden __private_extern__
206	#else /* __BUILDING_XNU_LIBRARY__ */
207	/* Don't hide symbols that the might be need to be used from outside */
208	#define __exported_push_hidden
209	#define __exported_pop
210	#define __exported_hidden
211	#endif /* __BUILDING_XNU_LIBRARY__ */
212
213	/* __deprecated causes the compiler to produce a warning when encountering
214	* code using the deprecated functionality.
215	* __deprecated_msg() does the same, and compilers that support it will print
216	* a message along with the deprecation warning.
217	* This may require turning on such warning with the -Wdeprecated flag.
218	* __deprecated_enum_msg() should be used on enums, and compilers that support
219	* it will print the deprecation warning.
220	* __kpi_deprecated() specifically indicates deprecation of kernel programming
221	* interfaces in Kernel.framework used by KEXTs.
222	*/
223	#define __deprecated __attribute__((__deprecated__))
224
225	#if __has_extension(attribute_deprecated_with_message) || \
226	(defined(__GNUC__) && ((__GNUC__ >= 5) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 5))))
227	#define __deprecated_msg(_msg) __attribute__((__deprecated__(_msg)))
228	#else
229	#define __deprecated_msg(_msg) __attribute__((__deprecated__))
230	#endif
231
232	#if __has_extension(enumerator_attributes)
233	#define __deprecated_enum_msg(_msg) __deprecated_msg(_msg)
234	#else
235	#define __deprecated_enum_msg(_msg)
236	#endif
237
238	#define __kpi_deprecated(_msg)
239
240	/* __unavailable causes the compiler to error out when encountering
241	* code using the tagged function
242	*/
243	#if __has_attribute(unavailable)
244	#define __unavailable __attribute__((__unavailable__))
245	#else
246	#define __unavailable
247	#endif
248
249	#define __kpi_unavailable
250
251	#define __kpi_deprecated_arm64_macos_unavailable
252
253	/* Delete pseudo-keywords wherever they are not available or needed. */
254	#ifndef __dead
255	#define __dead
256	#define __pure
257	#endif
258
259	/*
260	* We use `__restrict' as a way to define the `restrict' type qualifier
261	* without disturbing older software that is unaware of C99 keywords.
262	*/
263	#if __STDC_VERSION__ < 199901
264	#define __restrict
265	#else
266	#define __restrict restrict
267	#endif
268
269	/* Compatibility with compilers and environments that don't support the
270	* nullability feature.
271	*/
272
273	#if !__has_feature(nullability)
274	#ifndef __nullable
275	#define __nullable
276	#endif
277	#ifndef __nonnull
278	#define __nonnull
279	#endif
280	#ifndef __null_unspecified
281	#define __null_unspecified
282	#endif
283	#ifndef _Nullable
284	#define _Nullable
285	#endif
286	#ifndef _Nonnull
287	#define _Nonnull
288	#endif
289	#ifndef _Null_unspecified
290	#define _Null_unspecified
291	#endif
292	#endif
293
294	/*
295	* __disable_tail_calls causes the compiler to not perform tail call
296	* optimization inside the marked function.
297	*/
298	#if __has_attribute(disable_tail_calls)
299	#define __disable_tail_calls __attribute__((__disable_tail_calls__))
300	#else
301	#define __disable_tail_calls
302	#endif
303
304	/*
305	* __not_tail_called causes the compiler to prevent tail call optimization
306	* on statically bound calls to the function. It has no effect on indirect
307	* calls. Virtual functions, objective-c methods, and functions marked as
308	* "always_inline" cannot be marked as __not_tail_called.
309	*/
310	#if __has_attribute(not_tail_called)
311	#define __not_tail_called __attribute__((__not_tail_called__))
312	#else
313	#define __not_tail_called
314	#endif
315
316	/*
317	* __result_use_check warns callers of a function that not using the function
318	* return value is a bug, i.e. dismissing malloc() return value results in a
319	* memory leak.
320	*/
321	#if __has_attribute(warn_unused_result)
322	#define __result_use_check __attribute__((__warn_unused_result__))
323	#else
324	#define __result_use_check
325	#endif
326
327	/*
328	* __swift_unavailable causes the compiler to mark a symbol as specifically
329	* unavailable in Swift, regardless of any other availability in C.
330	*/
331	#if __has_feature(attribute_availability_swift)
332	#define __swift_unavailable(_msg) __attribute__((__availability__(swift, unavailable, message=_msg)))
333	#else
334	#define __swift_unavailable(_msg)
335	#endif
336
337	/*
338	* Attributes to support Swift concurrency.
339	*/
340	#if __has_attribute(__swift_attr__)
341	#define __swift_unavailable_from_async(_msg) __attribute__((__swift_attr__("@_unavailableFromAsync(message: \"" _msg "\")")))
342	#define __swift_nonisolated __attribute__((__swift_attr__("nonisolated")))
343	#define __swift_nonisolated_unsafe __attribute__((__swift_attr__("nonisolated(unsafe)")))
344	#else
345	#define __swift_unavailable_from_async(_msg)
346	#define __swift_nonisolated
347	#define __swift_nonisolated_unsafe
348	#endif
349
350	/*
351	* __abortlike is the attribute to put on functions like abort() that are
352	* typically used to mark assertions. These optimize the codegen
353	* for outlining while still maintaining debugability.
354	*/
355	#ifndef __abortlike
356	#define __abortlike __dead2 __cold __not_tail_called
357	#endif
358
359	/* Declaring inline functions within headers is error-prone due to differences
360	* across various versions of the C language and extensions. __header_inline
361	* can be used to declare inline functions within system headers. In cases
362	* where you want to force inlining instead of letting the compiler make
363	* the decision, you can use __header_always_inline.
364	*
365	* Be aware that using inline for functions which compilers may also provide
366	* builtins can behave differently under various compilers. If you intend to
367	* provide an inline version of such a function, you may want to use a macro
368	* instead.
369	*
370	* The check for !__GNUC__ || __clang__ is because gcc doesn't correctly
371	* support c99 inline in some cases:
372	* http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55965
373	*/
374
375	#if defined(__cplusplus) || \
376	(__STDC_VERSION__ >= 199901L && \
377	!defined(__GNUC_GNU_INLINE__) && \
378	(!defined(__GNUC__) || defined(__clang__)))
379	# define __header_inline inline
380	#elif defined(__GNUC__) && defined(__GNUC_STDC_INLINE__)
381	# define __header_inline extern __inline __attribute__((__gnu_inline__))
382	#elif defined(__GNUC__)
383	# define __header_inline extern __inline
384	#else
385	/* If we land here, we've encountered an unsupported compiler,
386	* so hopefully it understands static __inline as a fallback.
387	*/
388	# define __header_inline static __inline
389	#endif
390
391	#ifdef __GNUC__
392	# define __header_always_inline __header_inline __attribute__ ((__always_inline__))
393	#else
394	/* Unfortunately, we're using a compiler that we don't know how to force to
395	* inline. Oh well.
396	*/
397	# define __header_always_inline __header_inline
398	#endif
399
400	/*
401	* Compiler-dependent macros that bracket portions of code where the
402	* "-Wunreachable-code" warning should be ignored. Please use sparingly.
403	*/
404	#if defined(__clang__)
405	# define __unreachable_ok_push \
406	_Pragma("clang diagnostic push") \
407	_Pragma("clang diagnostic ignored \"-Wunreachable-code\"")
408	# define __unreachable_ok_pop \
409	_Pragma("clang diagnostic pop")
410	#elif defined(__GNUC__) && ((__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6))
411	# define __unreachable_ok_push \
412	_Pragma("GCC diagnostic push") \
413	_Pragma("GCC diagnostic ignored \"-Wunreachable-code\"")
414	# define __unreachable_ok_pop \
415	_Pragma("GCC diagnostic pop")
416	#else
417	# define __unreachable_ok_push
418	# define __unreachable_ok_pop
419	#endif
420
421	/*
422	* Compiler-dependent macros to declare that functions take printf-like
423	* or scanf-like arguments. They are null except for versions of gcc
424	* that are known to support the features properly. Functions declared
425	* with these attributes will cause compilation warnings if there is a
426	* mismatch between the format string and subsequent function parameter
427	* types.
428	*/
429	#define __printflike(fmtarg, firstvararg) \
430	__attribute__((__format__ (__printf__, fmtarg, firstvararg)))
431	#define __printf0like(fmtarg, firstvararg) \
432	__attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
433	#define __scanflike(fmtarg, firstvararg) \
434	__attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
435	#define __osloglike(fmtarg, firstvararg) \
436	__attribute__((__format__ (__os_log__, fmtarg, firstvararg)))
437
438	#define __IDSTRING(name, string) static const char name[] __used = string
439
440	#ifndef __COPYRIGHT
441	#define __COPYRIGHT(s) __IDSTRING(copyright,s)
442	#endif
443
444	#ifndef __RCSID
445	#define __RCSID(s) __IDSTRING(rcsid,s)
446	#endif
447
448	#ifndef __SCCSID
449	#define __SCCSID(s) __IDSTRING(sccsid,s)
450	#endif
451
452	#ifndef __PROJECT_VERSION
453	#define __PROJECT_VERSION(s) __IDSTRING(project_version,s)
454	#endif
455
456	/* Source compatibility only, ID string not emitted in object file */
457	#ifndef __FBSDID
458	#define __FBSDID(s)
459	#endif
460
461	#ifndef __DECONST
462	#define __DECONST(type, var) __CAST_AWAY_QUALIFIER(var, const, type)
463	#endif
464
465	#ifndef __DEVOLATILE
466	#define __DEVOLATILE(type, var) __CAST_AWAY_QUALIFIER(var, volatile, type)
467	#endif
468
469	#ifndef __DEQUALIFY
470	#define __DEQUALIFY(type, var) __CAST_AWAY_QUALIFIER(var, const volatile, type)
471	#endif
472
473	/*
474	* __alloc_align can be used to label function arguments that represent the
475	* alignment of the returned pointer.
476	*/
477	#ifndef __alloc_align
478	#if __has_attribute(alloc_align)
479	#define __alloc_align(n) __attribute__((alloc_align(n)))
480	#else
481	#define __alloc_align(n)
482	#endif
483	#endif // __alloc_align
484
485	/*
486	* __alloc_size can be used to label function arguments that represent the
487	* size of memory that the function allocates and returns. The one-argument
488	* form labels a single argument that gives the allocation size (where the
489	* arguments are numbered from 1):
490	*
491	* void *malloc(size_t __size) __alloc_size(1);
492	*
493	* The two-argument form handles the case where the size is calculated as the
494	* product of two arguments:
495	*
496	* void *calloc(size_t __count, size_t __size) __alloc_size(1,2);
497	*/
498	#ifndef __alloc_size
499	#if __has_attribute(alloc_size)
500	#define __alloc_size(...) __attribute__((alloc_size(__VA_ARGS__)))
501	#else
502	#define __alloc_size(...)
503	#endif
504	#endif // __alloc_size
505
506	/*
507	* Facilities below assist adoption of -Wunsafe-buffer-usage, an off-by-default
508	* Clang compiler warning that helps the developer minimize unsafe, raw
509	* buffer manipulation in the code that may lead to buffer overflow
510	* vulnerabilities.
511	*
512	* They are primarily designed for modern C++ code where -Wunsafe-buffer-usage
513	* comes with automatic fix-it hints that help the developer transform
514	* their code to use modern C++ containers, which may be made bounds-safe by
515	* linking against a version of the C++ standard library that offers
516	* bounds-checked containers.
517	* They can be used in plain C, but -fbounds-safety is the preferred solution
518	* for plain C (see also <ptrcheck.h>).
519	*
520	* Attribute __unsafe_buffer_usage can be used to label functions that should be
521	* avoided as they may perform or otherwise introduce unsafe buffer manipulation
522	* operations. The attribute can also be attached to class/struct fields that
523	* are used in unsafe buffer manipulations.
524	*
525	* Calls to attribute annotated functions are flagged by -Wunsafe-buffer-usage, similar to
526	* how unchecked buffer manipulation operations are flagged when observed
527	* by the compiler directly. Similarly, use of and assignment to the struct/class fields
528	* that have the attribute also get flagged by the compiler.
529	*
530	* // An unsafe function that needs to be avoided.
531	* __unsafe_buffer_usage
532	* void foo(int *buf, size_t size);
533	*
534	* // A safe alternative to foo().
535	* void foo(std::span<int> buf);
536	*
537	* void bar(size_t idx) {
538	* int array[5];
539	*
540	* // Direct unsafe buffer manipulation through subscript operator:
541	* array[idx] = 3; // warning: function introduces unsafe buffer manipulation [-Wunsafe-buffer-usage]
542	* // Unsafe buffer manipulation through function foo():
543	* foo(array, 5); // warning: function introduces unsafe buffer manipulation [-Wunsafe-buffer-usage]
544	* // Checked buffer manipulation, with bounds information automatically
545	* // preserved for the purposes of runtime checks in standard library:
546	* foo(array); // no warning
547	* }
548	*
549	* struct Reader {
550	* // Field involved in unsafe buffer manipulation
551	* __unsafe_buffer_usage
552	* void *ptr;
553	*
554	* __unsafe_buffer_usage
555	* size_t sz, count;
556	* };
557	*
558	* void add_element(Reader rdr, int value) {
559	* if(rdr.count < rdr.sz) { // warning: unsafe buffer access [-Wunsafe-buffer-usage]
560	* rdr.ptr[rdr.count] = value; // warning: unsafe buffer access [-Wunsafe-buffer-usage]
561	* rdr.count++; // warning: unsafe buffer access [-Wunsafe-buffer-usage]
562	* }
563	* }
564	*
565	* While annotating a function as __unsafe_buffer_usage has an effect similar
566	* to annotating it as __deprecated, the __unsafe_buffer_usage attribute
567	* should be used whenever the resulting warning needs to be controlled
568	* by the -Wunsafe-buffer-usage flag (which is turned off in codebases that
569	* don't attempt to achieve bounds safety this way) as opposed to -Wdeprecated
570	* (enabled in most codebases).
571	*
572	* The attribute suppresses all -Wunsafe-buffer-usage warnings inside the
573	* function's body as it is explictly marked as unsafe by the user and
574	* introduces new warnings at each call site to help the developers avoid the
575	* function entirely. Most of the time it does not make sense to annotate a
576	* function as __unsafe_buffer_usage without providing the users with a safe
577	* alternative.
578	*
579	* Pragmas __unsafe_buffer_usage_begin and __unsafe_buffer_usage_end
580	* annotate a range of code as intentionally containing unsafe buffer
581	* operations. They suppress -Wunsafe-buffer-usage warnings
582	* for unsafe operations in range:
583	*
584	* __unsafe_buffer_usage_begin
585	* array[idx] = 3; // warning suppressed
586	* foo(array, 5); // warning suppressed
587	* __unsafe_buffer_usage_end
588	*
589	* These pragmas are NOT a way to mass-annotate functions with the attribute
590	* __unsafe_buffer_usage. Functions declared within the pragma range
591	* do NOT get annotated automatically.
592	*/
593	#if __has_cpp_attribute(clang::unsafe_buffer_usage)
594	#define __has_safe_buffers 1
595	#define __unsafe_buffer_usage [[clang::unsafe_buffer_usage]]
596	#elif __has_attribute(unsafe_buffer_usage)
597	#define __has_safe_buffers 1
598	#define __unsafe_buffer_usage __attribute__((__unsafe_buffer_usage__))
599	#else
600	#define __has_safe_buffers 0
601	#define __unsafe_buffer_usage
602	#endif
603	#if __has_safe_buffers
604	#define __unsafe_buffer_usage_begin _Pragma("clang unsafe_buffer_usage begin")
605	#define __unsafe_buffer_usage_end _Pragma("clang unsafe_buffer_usage end")
606	#else
607	#define __unsafe_buffer_usage_begin
608	#define __unsafe_buffer_usage_end
609	#endif
610
611	/*
612	* COMPILATION ENVIRONMENTS -- see compat(5) for additional detail
613	*
614	* DEFAULT By default newly complied code will get POSIX APIs plus
615	* Apple API extensions in scope.
616	*
617	* Most users will use this compilation environment to avoid
618	* behavioral differences between 32 and 64 bit code.
619	*
620	* LEGACY Defining _NONSTD_SOURCE will get pre-POSIX APIs plus Apple
621	* API extensions in scope.
622	*
623	* This is generally equivalent to the Tiger release compilation
624	* environment, except that it cannot be applied to 64 bit code;
625	* its use is discouraged.
626	*
627	* We expect this environment to be deprecated in the future.
628	*
629	* STRICT Defining _POSIX_C_SOURCE or _XOPEN_SOURCE restricts the
630	* available APIs to exactly the set of APIs defined by the
631	* corresponding standard, based on the value defined.
632	*
633	* A correct, portable definition for _POSIX_C_SOURCE is 200112L.
634	* A correct, portable definition for _XOPEN_SOURCE is 600L.
635	*
636	* Apple API extensions are not visible in this environment,
637	* which can cause Apple specific code to fail to compile,
638	* or behave incorrectly if prototypes are not in scope or
639	* warnings about missing prototypes are not enabled or ignored.
640	*
641	* In any compilation environment, for correct symbol resolution to occur,
642	* function prototypes must be in scope. It is recommended that all Apple
643	* tools users add either the "-Wall" or "-Wimplicit-function-declaration"
644	* compiler flags to their projects to be warned when a function is being
645	* used without a prototype in scope.
646	*/
647
648	/* These settings are particular to each product. */
649	/* Platform: MacOSX */
650	#if defined(__i386__)
651	#define __DARWIN_ONLY_64_BIT_INO_T 0
652	#define __DARWIN_ONLY_UNIX_CONFORMANCE 0
653	#define __DARWIN_ONLY_VERS_1050 0
654	#elif defined(__x86_64__)
655	#define __DARWIN_ONLY_64_BIT_INO_T 0
656	#define __DARWIN_ONLY_UNIX_CONFORMANCE 1
657	#define __DARWIN_ONLY_VERS_1050 0
658	#else
659	#define __DARWIN_ONLY_64_BIT_INO_T 1
660	#define __DARWIN_ONLY_UNIX_CONFORMANCE 1
661	#define __DARWIN_ONLY_VERS_1050 1
662	#endif
663
664	/*
665	* The __DARWIN_ALIAS macros are used to do symbol renaming; they allow
666	* legacy code to use the old symbol, thus maintaining binary compatibility
667	* while new code can use a standards compliant version of the same function.
668	*
669	* __DARWIN_ALIAS is used by itself if the function signature has not
670	* changed, it is used along with a #ifdef check for __DARWIN_UNIX03
671	* if the signature has changed. Because the __LP64__ environment
672	* only supports UNIX03 semantics it causes __DARWIN_UNIX03 to be
673	* defined, but causes __DARWIN_ALIAS to do no symbol mangling.
674	*
675	* As a special case, when XCode is used to target a specific version of the
676	* OS, the manifest constant __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__
677	* will be defined by the compiler, with the digits representing major version
678	* time 100 + minor version times 10 (e.g. 10.5 := 1050). If we are targeting
679	* pre-10.5, and it is the default compilation environment, revert the
680	* compilation environment to pre-__DARWIN_UNIX03.
681	*/
682	#if !defined(__DARWIN_UNIX03)
683	# if __DARWIN_ONLY_UNIX_CONFORMANCE
684	# if defined(_NONSTD_SOURCE)
685	# error "Can't define _NONSTD_SOURCE when only UNIX conformance is available."
686	# endif /* _NONSTD_SOURCE */
687	# define __DARWIN_UNIX03 1
688	# elif defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && ((__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ - 0) < 1040)
689	# define __DARWIN_UNIX03 0
690	# elif defined(_DARWIN_C_SOURCE) || defined(_XOPEN_SOURCE) || defined(_POSIX_C_SOURCE)
691	# if defined(_NONSTD_SOURCE)
692	# error "Can't define both _NONSTD_SOURCE and any of _DARWIN_C_SOURCE, _XOPEN_SOURCE or _POSIX_C_SOURCE."
693	# endif /* _NONSTD_SOURCE */
694	# define __DARWIN_UNIX03 1
695	# elif defined(_NONSTD_SOURCE)
696	# define __DARWIN_UNIX03 0
697	# else /* default */
698	# if defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && ((__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ - 0) < 1050)
699	# define __DARWIN_UNIX03 0
700	# else /* __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ >= 1050 */
701	# define __DARWIN_UNIX03 1
702	# endif /* __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ >= 1050 */
703	# endif /* _DARWIN_C_SOURCE || _XOPEN_SOURCE || _POSIX_C_SOURCE || __LP64__ */
704	#endif /* !__DARWIN_UNIX03 */
705
706	#if !defined(__DARWIN_64_BIT_INO_T)
707	# if defined(_DARWIN_USE_64_BIT_INODE)
708	# if defined(_DARWIN_NO_64_BIT_INODE)
709	# error "Can't define both _DARWIN_USE_64_BIT_INODE and _DARWIN_NO_64_BIT_INODE."
710	# endif /* _DARWIN_NO_64_BIT_INODE */
711	# define __DARWIN_64_BIT_INO_T 1
712	# elif defined(_DARWIN_NO_64_BIT_INODE)
713	# if __DARWIN_ONLY_64_BIT_INO_T
714	# error "Can't define _DARWIN_NO_64_BIT_INODE when only 64-bit inodes are available."
715	# endif /* __DARWIN_ONLY_64_BIT_INO_T */
716	# define __DARWIN_64_BIT_INO_T 0
717	# else /* default */
718	# if __DARWIN_ONLY_64_BIT_INO_T
719	# define __DARWIN_64_BIT_INO_T 1
720	# elif defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && ((__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ - 0) < 1060) || __DARWIN_UNIX03 == 0
721	# define __DARWIN_64_BIT_INO_T 0
722	# else /* default */
723	# define __DARWIN_64_BIT_INO_T 1
724	# endif /* __DARWIN_ONLY_64_BIT_INO_T */
725	# endif
726	#endif /* !__DARWIN_64_BIT_INO_T */
727
728	#if !defined(__DARWIN_VERS_1050)
729	# if __DARWIN_ONLY_VERS_1050
730	# define __DARWIN_VERS_1050 1
731	# elif defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && ((__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ - 0) < 1050) || __DARWIN_UNIX03 == 0
732	# define __DARWIN_VERS_1050 0
733	# else /* default */
734	# define __DARWIN_VERS_1050 1
735	# endif
736	#endif /* !__DARWIN_VERS_1050 */
737
738	#if !defined(__DARWIN_NON_CANCELABLE)
739	# define __DARWIN_NON_CANCELABLE 0
740	#endif /* !__DARWIN_NON_CANCELABLE */
741
742	/*
743	* symbol suffixes used for symbol versioning
744	*/
745	#if __DARWIN_UNIX03
746	# if __DARWIN_ONLY_UNIX_CONFORMANCE
747	# define __DARWIN_SUF_UNIX03 /* nothing */
748	# else /* !__DARWIN_ONLY_UNIX_CONFORMANCE */
749	# define __DARWIN_SUF_UNIX03 "$UNIX2003"
750	# endif /* __DARWIN_ONLY_UNIX_CONFORMANCE */
751
752	# if __DARWIN_64_BIT_INO_T
753	# if __DARWIN_ONLY_64_BIT_INO_T
754	# define __DARWIN_SUF_64_BIT_INO_T /* nothing */
755	# else /* !__DARWIN_ONLY_64_BIT_INO_T */
756	# define __DARWIN_SUF_64_BIT_INO_T "$INODE64"
757	# endif /* __DARWIN_ONLY_64_BIT_INO_T */
758	# else /* !__DARWIN_64_BIT_INO_T */
759	# define __DARWIN_SUF_64_BIT_INO_T /* nothing */
760	# endif /* __DARWIN_64_BIT_INO_T */
761
762	# if __DARWIN_VERS_1050
763	# if __DARWIN_ONLY_VERS_1050
764	# define __DARWIN_SUF_1050 /* nothing */
765	# else /* !__DARWIN_ONLY_VERS_1050 */
766	# define __DARWIN_SUF_1050 "$1050"
767	# endif /* __DARWIN_ONLY_VERS_1050 */
768	# else /* !__DARWIN_VERS_1050 */
769	# define __DARWIN_SUF_1050 /* nothing */
770	# endif /* __DARWIN_VERS_1050 */
771
772	# if __DARWIN_NON_CANCELABLE
773	# define __DARWIN_SUF_NON_CANCELABLE "$NOCANCEL"
774	# else /* !__DARWIN_NON_CANCELABLE */
775	# define __DARWIN_SUF_NON_CANCELABLE /* nothing */
776	# endif /* __DARWIN_NON_CANCELABLE */
777
778	#else /* !__DARWIN_UNIX03 */
779	# define __DARWIN_SUF_UNIX03 /* nothing */
780	# define __DARWIN_SUF_64_BIT_INO_T /* nothing */
781	# define __DARWIN_SUF_NON_CANCELABLE /* nothing */
782	# define __DARWIN_SUF_1050 /* nothing */
783	#endif /* __DARWIN_UNIX03 */
784
785	#define __DARWIN_SUF_EXTSN "$DARWIN_EXTSN"
786
787	/*
788	* symbol versioning macros
789	*/
790	#define __DARWIN_ALIAS(sym) __asm("_" __STRING(sym) __DARWIN_SUF_UNIX03)
791	#define __DARWIN_ALIAS_C(sym) __asm("_" __STRING(sym) __DARWIN_SUF_NON_CANCELABLE __DARWIN_SUF_UNIX03)
792	#define __DARWIN_ALIAS_I(sym) __asm("_" __STRING(sym) __DARWIN_SUF_64_BIT_INO_T __DARWIN_SUF_UNIX03)
793	#define __DARWIN_NOCANCEL(sym) __asm("_" __STRING(sym) __DARWIN_SUF_NON_CANCELABLE)
794	#define __DARWIN_INODE64(sym) __asm("_" __STRING(sym) __DARWIN_SUF_64_BIT_INO_T)
795
796	#define __DARWIN_1050(sym) __asm("_" __STRING(sym) __DARWIN_SUF_1050)
797	#define __DARWIN_1050ALIAS(sym) __asm("_" __STRING(sym) __DARWIN_SUF_1050 __DARWIN_SUF_UNIX03)
798	#define __DARWIN_1050ALIAS_C(sym) __asm("_" __STRING(sym) __DARWIN_SUF_1050 __DARWIN_SUF_NON_CANCELABLE __DARWIN_SUF_UNIX03)
799	#define __DARWIN_1050ALIAS_I(sym) __asm("_" __STRING(sym) __DARWIN_SUF_1050 __DARWIN_SUF_64_BIT_INO_T __DARWIN_SUF_UNIX03)
800	#define __DARWIN_1050INODE64(sym) __asm("_" __STRING(sym) __DARWIN_SUF_1050 __DARWIN_SUF_64_BIT_INO_T)
801
802	#define __DARWIN_EXTSN(sym) __asm("_" __STRING(sym) __DARWIN_SUF_EXTSN)
803	#define __DARWIN_EXTSN_C(sym) __asm("_" __STRING(sym) __DARWIN_SUF_EXTSN __DARWIN_SUF_NON_CANCELABLE)
804
805	/*
806	* symbol release macros
807	*/
808	#include <sys/_symbol_aliasing.h>
809
810	#if defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__)
811	#define __DARWIN_ALIAS_STARTING(_mac, _iphone, x) __DARWIN_ALIAS_STARTING_IPHONE_##_iphone(x)
812	#elif defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__)
813	#define __DARWIN_ALIAS_STARTING(_mac, _iphone, x) __DARWIN_ALIAS_STARTING_MAC_##_mac(x)
814	#else
815	#define __DARWIN_ALIAS_STARTING(_mac, _iphone, x) x
816	#endif
817
818
819	/*
820	* POSIX.1 requires that the macros we test be defined before any standard
821	* header file is included. This permits us to convert values for feature
822	* testing, as necessary, using only _POSIX_C_SOURCE.
823	*
824	* Here's a quick run-down of the versions:
825	* defined(_POSIX_SOURCE) 1003.1-1988
826	* _POSIX_C_SOURCE == 1L 1003.1-1990
827	* _POSIX_C_SOURCE == 2L 1003.2-1992 C Language Binding Option
828	* _POSIX_C_SOURCE == 199309L 1003.1b-1993
829	* _POSIX_C_SOURCE == 199506L 1003.1c-1995, 1003.1i-1995,
830	* and the omnibus ISO/IEC 9945-1: 1996
831	* _POSIX_C_SOURCE == 200112L 1003.1-2001
832	* _POSIX_C_SOURCE == 200809L 1003.1-2008
833	*
834	* In addition, the X/Open Portability Guide, which is now the Single UNIX
835	* Specification, defines a feature-test macro which indicates the version of
836	* that specification, and which subsumes _POSIX_C_SOURCE.
837	*/
838
839	/* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1L. */
840	#if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 1L
841	#undef _POSIX_C_SOURCE
842	#define _POSIX_C_SOURCE 199009L
843	#endif
844
845	/* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2L. */
846	#if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 2L
847	#undef _POSIX_C_SOURCE
848	#define _POSIX_C_SOURCE 199209L
849	#endif
850
851	/* Deal with various X/Open Portability Guides and Single UNIX Spec. */
852	#ifdef _XOPEN_SOURCE
853	#if _XOPEN_SOURCE - 0L >= 700L && (!defined(_POSIX_C_SOURCE) || _POSIX_C_SOURCE - 0L < 200809L)
854	#undef _POSIX_C_SOURCE
855	#define _POSIX_C_SOURCE 200809L
856	#elif _XOPEN_SOURCE - 0L >= 600L && (!defined(_POSIX_C_SOURCE) || _POSIX_C_SOURCE - 0L < 200112L)
857	#undef _POSIX_C_SOURCE
858	#define _POSIX_C_SOURCE 200112L
859	#elif _XOPEN_SOURCE - 0L >= 500L && (!defined(_POSIX_C_SOURCE) || _POSIX_C_SOURCE - 0L < 199506L)
860	#undef _POSIX_C_SOURCE
861	#define _POSIX_C_SOURCE 199506L
862	#endif
863	#endif
864
865	/*
866	* Deal with all versions of POSIX. The ordering relative to the tests above is
867	* important.
868	*/
869	#if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
870	#define _POSIX_C_SOURCE 198808L
871	#endif
872
873	/* POSIX C deprecation macros */
874	#include <sys/_posix_availability.h>
875
876	#define __POSIX_C_DEPRECATED(ver) ___POSIX_C_DEPRECATED_STARTING_##ver
877
878	/*
879	* Set a single macro which will always be defined and can be used to determine
880	* the appropriate namespace. For POSIX, these values will correspond to
881	* _POSIX_C_SOURCE value. Currently there are two additional levels corresponding
882	* to ANSI (_ANSI_SOURCE) and Darwin extensions (_DARWIN_C_SOURCE)
883	*/
884	#define __DARWIN_C_ANSI 010000L
885	#define __DARWIN_C_FULL 900000L
886
887	#if defined(_ANSI_SOURCE)
888	#define __DARWIN_C_LEVEL __DARWIN_C_ANSI
889	#elif defined(_POSIX_C_SOURCE) && !defined(_DARWIN_C_SOURCE) && !defined(_NONSTD_SOURCE)
890	#define __DARWIN_C_LEVEL _POSIX_C_SOURCE
891	#else
892	#define __DARWIN_C_LEVEL __DARWIN_C_FULL
893	#endif
894
895	/* If the developer has neither requested a strict language mode nor a version
896	* of POSIX, turn on functionality provided by __STDC_WANT_LIB_EXT1__ as part
897	* of __DARWIN_C_FULL.
898	*/
899	#if !defined(__STDC_WANT_LIB_EXT1__) && !defined(__STRICT_ANSI__) && __DARWIN_C_LEVEL >= __DARWIN_C_FULL
900	#define __STDC_WANT_LIB_EXT1__ 1
901	#endif
902
903	/*
904	* long long is not supported in c89 (__STRICT_ANSI__), but g++ -ansi and
905	* c99 still want long longs. While not perfect, we allow long longs for
906	* g++.
907	*/
908	#if (defined(__STRICT_ANSI__) && (__STDC_VERSION__ - 0 < 199901L) && !defined(__GNUG__))
909	#define __DARWIN_NO_LONG_LONG 1
910	#else
911	#define __DARWIN_NO_LONG_LONG 0
912	#endif
913
914	/*****************************************
915	* Public darwin-specific feature macros
916	*****************************************/
917
918	/*
919	* _DARWIN_FEATURE_64_BIT_INODE indicates that the ino_t type is 64-bit, and
920	* structures modified for 64-bit inodes (like struct stat) will be used.
921	*/
922	#if __DARWIN_64_BIT_INO_T
923	#define _DARWIN_FEATURE_64_BIT_INODE 1
924	#endif
925
926	/*
927	* _DARWIN_FEATURE_64_ONLY_BIT_INODE indicates that the ino_t type may only
928	* be 64-bit; there is no support for 32-bit ino_t when this macro is defined
929	* (and non-zero). There is no struct stat64 either, as the regular
930	* struct stat will already be the 64-bit version.
931	*/
932	#if __DARWIN_ONLY_64_BIT_INO_T
933	#define _DARWIN_FEATURE_ONLY_64_BIT_INODE 1
934	#endif
935
936	/*
937	* _DARWIN_FEATURE_ONLY_VERS_1050 indicates that only those APIs updated
938	* in 10.5 exists; no pre-10.5 variants are available.
939	*/
940	#if __DARWIN_ONLY_VERS_1050
941	#define _DARWIN_FEATURE_ONLY_VERS_1050 1
942	#endif
943
944	/*
945	* _DARWIN_FEATURE_ONLY_UNIX_CONFORMANCE indicates only UNIX conforming API
946	* are available (the legacy BSD APIs are not available)
947	*/
948	#if __DARWIN_ONLY_UNIX_CONFORMANCE
949	#define _DARWIN_FEATURE_ONLY_UNIX_CONFORMANCE 1
950	#endif
951
952	/*
953	* _DARWIN_FEATURE_UNIX_CONFORMANCE indicates whether UNIX conformance is on,
954	* and specifies the conformance level (3 is SUSv3)
955	*/
956	#if __DARWIN_UNIX03
957	#define _DARWIN_FEATURE_UNIX_CONFORMANCE 3
958	#endif
959
960
961	/*
962	* This macro casts away the qualifier from the variable
963	*
964	* Note: use at your own risk, removing qualifiers can result in
965	* catastrophic run-time failures.
966	*/
967	#ifndef __CAST_AWAY_QUALIFIER
968	/*
969	* XXX: this shouldn't ignore anything more than -Wcast-qual,
970	* but the old implementation made it an almighty cast that
971	* ignored everything, so things break left and right if you
972	* make it only ignore -Wcast-qual.
973	*/
974	#define __CAST_AWAY_QUALIFIER(variable, qualifier, type) \
975	_Pragma("GCC diagnostic push") \
976	_Pragma("GCC diagnostic ignored \"-Wcast-qual\"") \
977	_Pragma("GCC diagnostic ignored \"-Wcast-align\"") \
978	_Pragma("GCC diagnostic ignored \"-Waddress-of-packed-member\"") \
979	((type)(variable)) \
980	_Pragma("GCC diagnostic pop")
981	#endif
982
983	/*
984	* __XNU_PRIVATE_EXTERN is a linkage decoration indicating that a symbol can be
985	* used from other compilation units, but not other libraries or executables.
986	*/
987	#ifndef __XNU_PRIVATE_EXTERN
988	#define __XNU_PRIVATE_EXTERN __attribute__((visibility("hidden")))
989	#endif
990
991	#if __has_include(<ptrcheck.h>)
992	#include <ptrcheck.h>
993	#else
994	#if __has_feature(bounds_safety)
995	#error -fbounds-safety is enabled, but <ptrcheck.h> is missing. \
996	This will lead to difficult-to-diagnose compilation errors.
997	#endif /* __has_feature(bounds_safety) */
998
999	/*
1000	* We intentionally define to nothing pointer attributes which do not have an
1001	* impact on the ABI. __indexable and __bidi_indexable are not defined because
1002	* of the ABI incompatibility that makes the diagnostic preferable.
1003	*/
1004	#define __has_ptrcheck 0
1005	#define __single
1006	#define __unsafe_indexable
1007	#define __counted_by(N)
1008	#define __counted_by_or_null(N)
1009	#define __sized_by(N)
1010	#define __sized_by_or_null(N)
1011	#define __ended_by(E)
1012	#define __terminated_by(T)
1013	#define __null_terminated
1014
1015	/*
1016	* Similarly, we intentionally define to nothing the
1017	* __ptrcheck_abi_assume_single and __ptrcheck_abi_assume_unsafe_indexable
1018	* macros because they do not lead to an ABI incompatibility. However, we do not
1019	* define the indexable and unsafe_indexable ones because the diagnostic is
1020	* better than the silent ABI break.
1021	*/
1022	#define __ptrcheck_abi_assume_single()
1023	#define __ptrcheck_abi_assume_unsafe_indexable()
1024
1025	/* __unsafe_forge intrinsics are defined as regular C casts. */
1026	#define __unsafe_forge_bidi_indexable(T, P, S) ((T)(P))
1027	#define __unsafe_forge_single(T, P) ((T)(P))
1028	#define __unsafe_forge_terminated_by(T, P, E) ((T)(P))
1029	#define __unsafe_forge_null_terminated(T, P) ((T)(P))
1030	#define __terminated_by_to_indexable(P) (P)
1031	#define __unsafe_terminated_by_to_indexable(P) (P)
1032	#define __null_terminated_to_indexable(P) (P)
1033	#define __unsafe_null_terminated_to_indexable(P) (P)
1034	#define __unsafe_terminated_by_from_indexable(T, P, ...) (P)
1035	#define __unsafe_null_terminated_from_indexable(P, ...) (P)
1036
1037	/* decay operates normally; attribute is meaningless without pointer checks. */
1038	#define __array_decay_dicards_count_in_parameters
1039
1040	/* this is a write-once variable; not useful without pointer checks. */
1041	#define __unsafe_late_const
1042
1043	#define __ptrcheck_unavailable
1044	#define __ptrcheck_unavailable_r(REPLACEMENT)
1045
1046	#endif /* !__has_include(<ptrcheck.h>) */
1047
1048
1049	#define __ASSUME_PTR_ABI_SINGLE_BEGIN __ptrcheck_abi_assume_single()
1050	#define __ASSUME_PTR_ABI_SINGLE_END __ptrcheck_abi_assume_unsafe_indexable()
1051
1052	#if __has_ptrcheck
1053	#define __header_indexable __indexable
1054	#define __header_bidi_indexable __bidi_indexable
1055	#else
1056	#define __header_indexable
1057	#define __header_bidi_indexable
1058	#endif
1059
1060	/*
1061	* Architecture validation for current SDK
1062	*/
1063	#if !defined(__sys_cdefs_arch_unknown__) && defined(__i386__)
1064	#elif !defined(__sys_cdefs_arch_unknown__) && defined(__x86_64__)
1065	#elif !defined(__sys_cdefs_arch_unknown__) && defined(__arm__)
1066	#elif !defined(__sys_cdefs_arch_unknown__) && defined(__arm64__)
1067	#else
1068	#error Unsupported architecture
1069	#endif
1070
1071
1072
1073	#define __compiler_barrier() __asm__ __volatile__("" ::: "memory")
1074
1075	#if __has_attribute(enum_extensibility)
1076	#define __enum_open __attribute__((__enum_extensibility__(open)))
1077	#define __enum_closed __attribute__((__enum_extensibility__(closed)))
1078	#else
1079	#define __enum_open
1080	#define __enum_closed
1081	#endif // __has_attribute(enum_extensibility)
1082
1083	#if __has_attribute(flag_enum)
1084	#define __enum_options __attribute__((__flag_enum__))
1085	#else
1086	#define __enum_options
1087	#endif
1088
1089	/*
1090	* Similar to OS_ENUM/OS_CLOSED_ENUM/OS_OPTIONS/OS_CLOSED_OPTIONS
1091	*
1092	* This provides more advanced type checking on compilers supporting
1093	* the proper extensions, even in C.
1094	*/
1095	#if __has_feature(objc_fixed_enum) || __has_extension(cxx_fixed_enum) || \
1096	__has_extension(cxx_strong_enums)
1097	#define __enum_decl(_name, _type, ...) \
1098	typedef enum : _type __VA_ARGS__ __enum_open _name
1099	#define __enum_closed_decl(_name, _type, ...) \
1100	typedef enum : _type __VA_ARGS__ __enum_closed _name
1101	#define __options_decl(_name, _type, ...) \
1102	typedef enum : _type __VA_ARGS__ __enum_open __enum_options _name
1103	#define __options_closed_decl(_name, _type, ...) \
1104	typedef enum : _type __VA_ARGS__ __enum_closed __enum_options _name
1105	#else
1106	#define __enum_decl(_name, _type, ...) \
1107	typedef _type _name; enum __VA_ARGS__ __enum_open
1108	#define __enum_closed_decl(_name, _type, ...) \
1109	typedef _type _name; enum __VA_ARGS__ __enum_closed
1110	#define __options_decl(_name, _type, ...) \
1111	typedef _type _name; enum __VA_ARGS__ __enum_open __enum_options
1112	#define __options_closed_decl(_name, _type, ...) \
1113	typedef _type _name; enum __VA_ARGS__ __enum_closed __enum_options
1114	#endif
1115
1116
1117
1118	#define __kernel_ptr_semantics
1119	#define __kernel_data_semantics
1120	#define __kernel_dual_semantics
1121
1122
1123
1124	#if defined(KERNEL_PRIVATE) && \
1125	__has_attribute(xnu_data_size) && \
1126	__has_attribute(xnu_returns_data_pointer)
1127	/*
1128	* Annotate function parameters to specify that they semantically
1129	* represent the size of a data-only backing storage.
1130	*/
1131	# define __xnu_data_size __attribute__((xnu_data_size))
1132	/*
1133	* Annotate function declarations to specify that the pointer they return
1134	* points to a data-only backing storage.
1135	*/
1136	# define __xnu_returns_data_pointer __attribute__((xnu_returns_data_pointer))
1137	#else
1138	# define __xnu_data_size
1139	# define __xnu_returns_data_pointer
1140	#endif
1141
1142
1143	#endif /* !_CDEFS_H_ */