python (3.12.0)
1 #ifndef Py_PYPORT_H
2 #define Py_PYPORT_H
3
4 #include "pyconfig.h" /* include for defines */
5
6 #include <inttypes.h>
7
8 #include <limits.h>
9 #ifndef UCHAR_MAX
10 # error "limits.h must define UCHAR_MAX"
11 #endif
12 #if UCHAR_MAX != 255
13 # error "Python's source code assumes C's unsigned char is an 8-bit type"
14 #endif
15
16
17 // Macro to use C++ static_cast<> in the Python C API.
18 #ifdef __cplusplus
19 # define _Py_STATIC_CAST(type, expr) static_cast<type>(expr)
20 #else
21 # define _Py_STATIC_CAST(type, expr) ((type)(expr))
22 #endif
23 // Macro to use the more powerful/dangerous C-style cast even in C++.
24 #define _Py_CAST(type, expr) ((type)(expr))
25
26 // Static inline functions should use _Py_NULL rather than using directly NULL
27 // to prevent C++ compiler warnings. On C++11 and newer, _Py_NULL is defined as
28 // nullptr.
29 #if defined(__cplusplus) && __cplusplus >= 201103
30 # define _Py_NULL nullptr
31 #else
32 # define _Py_NULL NULL
33 #endif
34
35
36 /* Defines to build Python and its standard library:
37 *
38 * - Py_BUILD_CORE: Build Python core. Give access to Python internals, but
39 * should not be used by third-party modules.
40 * - Py_BUILD_CORE_BUILTIN: Build a Python stdlib module as a built-in module.
41 * - Py_BUILD_CORE_MODULE: Build a Python stdlib module as a dynamic library.
42 *
43 * Py_BUILD_CORE_BUILTIN and Py_BUILD_CORE_MODULE imply Py_BUILD_CORE.
44 *
45 * On Windows, Py_BUILD_CORE_MODULE exports "PyInit_xxx" symbol, whereas
46 * Py_BUILD_CORE_BUILTIN does not.
47 */
48 #if defined(Py_BUILD_CORE_BUILTIN) && !defined(Py_BUILD_CORE)
49 # define Py_BUILD_CORE
50 #endif
51 #if defined(Py_BUILD_CORE_MODULE) && !defined(Py_BUILD_CORE)
52 # define Py_BUILD_CORE
53 #endif
54
55
56 /**************************************************************************
57 Symbols and macros to supply platform-independent interfaces to basic
58 C language & library operations whose spellings vary across platforms.
59
60 Please try to make documentation here as clear as possible: by definition,
61 the stuff here is trying to illuminate C's darkest corners.
62
63 Config #defines referenced here:
64
65 SIGNED_RIGHT_SHIFT_ZERO_FILLS
66 Meaning: To be defined iff i>>j does not extend the sign bit when i is a
67 signed integral type and i < 0.
68 Used in: Py_ARITHMETIC_RIGHT_SHIFT
69
70 Py_DEBUG
71 Meaning: Extra checks compiled in for debug mode.
72 Used in: Py_SAFE_DOWNCAST
73
74 **************************************************************************/
75
76 /* typedefs for some C9X-defined synonyms for integral types.
77 *
78 * The names in Python are exactly the same as the C9X names, except with a
79 * Py_ prefix. Until C9X is universally implemented, this is the only way
80 * to ensure that Python gets reliable names that don't conflict with names
81 * in non-Python code that are playing their own tricks to define the C9X
82 * names.
83 *
84 * NOTE: don't go nuts here! Python has no use for *most* of the C9X
85 * integral synonyms. Only define the ones we actually need.
86 */
87
88 /* long long is required. Ensure HAVE_LONG_LONG is defined for compatibility. */
89 #ifndef HAVE_LONG_LONG
90 #define HAVE_LONG_LONG 1
91 #endif
92 #ifndef PY_LONG_LONG
93 #define PY_LONG_LONG long long
94 /* If LLONG_MAX is defined in limits.h, use that. */
95 #define PY_LLONG_MIN LLONG_MIN
96 #define PY_LLONG_MAX LLONG_MAX
97 #define PY_ULLONG_MAX ULLONG_MAX
98 #endif
99
100 #define PY_UINT32_T uint32_t
101 #define PY_UINT64_T uint64_t
102
103 /* Signed variants of the above */
104 #define PY_INT32_T int32_t
105 #define PY_INT64_T int64_t
106
107 /* PYLONG_BITS_IN_DIGIT describes the number of bits per "digit" (limb) in the
108 * PyLongObject implementation (longintrepr.h). It's currently either 30 or 15,
109 * defaulting to 30. The 15-bit digit option may be removed in the future.
110 */
111 #ifndef PYLONG_BITS_IN_DIGIT
112 #define PYLONG_BITS_IN_DIGIT 30
113 #endif
114
115 /* uintptr_t is the C9X name for an unsigned integral type such that a
116 * legitimate void* can be cast to uintptr_t and then back to void* again
117 * without loss of information. Similarly for intptr_t, wrt a signed
118 * integral type.
119 */
120 typedef uintptr_t Py_uintptr_t;
121 typedef intptr_t Py_intptr_t;
122
123 /* Py_ssize_t is a signed integral type such that sizeof(Py_ssize_t) ==
124 * sizeof(size_t). C99 doesn't define such a thing directly (size_t is an
125 * unsigned integral type). See PEP 353 for details.
126 * PY_SSIZE_T_MAX is the largest positive value of type Py_ssize_t.
127 */
128 #ifdef HAVE_PY_SSIZE_T
129
130 #elif HAVE_SSIZE_T
131 typedef ssize_t Py_ssize_t;
132 # define PY_SSIZE_T_MAX SSIZE_MAX
133 #elif SIZEOF_VOID_P == SIZEOF_SIZE_T
134 typedef Py_intptr_t Py_ssize_t;
135 # define PY_SSIZE_T_MAX INTPTR_MAX
136 #else
137 # error "Python needs a typedef for Py_ssize_t in pyport.h."
138 #endif
139
140 /* Smallest negative value of type Py_ssize_t. */
141 #define PY_SSIZE_T_MIN (-PY_SSIZE_T_MAX-1)
142
143 /* Py_hash_t is the same size as a pointer. */
144 #define SIZEOF_PY_HASH_T SIZEOF_SIZE_T
145 typedef Py_ssize_t Py_hash_t;
146 /* Py_uhash_t is the unsigned equivalent needed to calculate numeric hash. */
147 #define SIZEOF_PY_UHASH_T SIZEOF_SIZE_T
148 typedef size_t Py_uhash_t;
149
150 /* Now PY_SSIZE_T_CLEAN is mandatory. This is just for backward compatibility. */
151 typedef Py_ssize_t Py_ssize_clean_t;
152
153 /* Largest possible value of size_t. */
154 #define PY_SIZE_MAX SIZE_MAX
155
156 /* Macro kept for backward compatibility: use directly "z" in new code.
157 *
158 * PY_FORMAT_SIZE_T is a modifier for use in a printf format to convert an
159 * argument with the width of a size_t or Py_ssize_t: "z" (C99).
160 */
161 #ifndef PY_FORMAT_SIZE_T
162 # define PY_FORMAT_SIZE_T "z"
163 #endif
164
165 /* Py_LOCAL can be used instead of static to get the fastest possible calling
166 * convention for functions that are local to a given module.
167 *
168 * Py_LOCAL_INLINE does the same thing, and also explicitly requests inlining,
169 * for platforms that support that.
170 *
171 * NOTE: You can only use this for functions that are entirely local to a
172 * module; functions that are exported via method tables, callbacks, etc,
173 * should keep using static.
174 */
175
176 #if defined(_MSC_VER)
177 /* ignore warnings if the compiler decides not to inline a function */
178 # pragma warning(disable: 4710)
179 /* fastest possible local call under MSVC */
180 # define Py_LOCAL(type) static type __fastcall
181 # define Py_LOCAL_INLINE(type) static __inline type __fastcall
182 #else
183 # define Py_LOCAL(type) static type
184 # define Py_LOCAL_INLINE(type) static inline type
185 #endif
186
187 #if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 < 0x030b0000
188 # define Py_MEMCPY memcpy
189 #endif
190
191 #ifdef HAVE_IEEEFP_H
192 #include <ieeefp.h> /* needed for 'finite' declaration on some platforms */
193 #endif
194
195 #include <math.h> /* Moved here from the math section, before extern "C" */
196
197 /********************************************
198 * WRAPPER FOR <time.h> and/or <sys/time.h> *
199 ********************************************/
200
201 #ifdef HAVE_SYS_TIME_H
202 #include <sys/time.h>
203 #endif
204 #include <time.h>
205
206 /******************************
207 * WRAPPER FOR <sys/select.h> *
208 ******************************/
209
210 /* NB caller must include <sys/types.h> */
211
212 #ifdef HAVE_SYS_SELECT_H
213 #include <sys/select.h>
214 #endif /* !HAVE_SYS_SELECT_H */
215
216 /*******************************
217 * stat() and fstat() fiddling *
218 *******************************/
219
220 #ifdef HAVE_SYS_STAT_H
221 #include <sys/stat.h>
222 #elif defined(HAVE_STAT_H)
223 #include <stat.h>
224 #endif
225
226 #ifndef S_IFMT
227 /* VisualAge C/C++ Failed to Define MountType Field in sys/stat.h */
228 #define S_IFMT 0170000
229 #endif
230
231 #ifndef S_IFLNK
232 /* Windows doesn't define S_IFLNK but posixmodule.c maps
233 * IO_REPARSE_TAG_SYMLINK to S_IFLNK */
234 # define S_IFLNK 0120000
235 #endif
236
237 #ifndef S_ISREG
238 #define S_ISREG(x) (((x) & S_IFMT) == S_IFREG)
239 #endif
240
241 #ifndef S_ISDIR
242 #define S_ISDIR(x) (((x) & S_IFMT) == S_IFDIR)
243 #endif
244
245 #ifndef S_ISCHR
246 #define S_ISCHR(x) (((x) & S_IFMT) == S_IFCHR)
247 #endif
248
249 #ifndef S_ISLNK
250 #define S_ISLNK(x) (((x) & S_IFMT) == S_IFLNK)
251 #endif
252
253 #ifdef __cplusplus
254 /* Move this down here since some C++ #include's don't like to be included
255 inside an extern "C" */
256 extern "C" {
257 #endif
258
259
260 /* Py_ARITHMETIC_RIGHT_SHIFT
261 * C doesn't define whether a right-shift of a signed integer sign-extends
262 * or zero-fills. Here a macro to force sign extension:
263 * Py_ARITHMETIC_RIGHT_SHIFT(TYPE, I, J)
264 * Return I >> J, forcing sign extension. Arithmetically, return the
265 * floor of I/2**J.
266 * Requirements:
267 * I should have signed integer type. In the terminology of C99, this can
268 * be either one of the five standard signed integer types (signed char,
269 * short, int, long, long long) or an extended signed integer type.
270 * J is an integer >= 0 and strictly less than the number of bits in the
271 * type of I (because C doesn't define what happens for J outside that
272 * range either).
273 * TYPE used to specify the type of I, but is now ignored. It's been left
274 * in for backwards compatibility with versions <= 2.6 or 3.0.
275 * Caution:
276 * I may be evaluated more than once.
277 */
278 #ifdef SIGNED_RIGHT_SHIFT_ZERO_FILLS
279 #define Py_ARITHMETIC_RIGHT_SHIFT(TYPE, I, J) \
280 ((I) < 0 ? -1-((-1-(I)) >> (J)) : (I) >> (J))
281 #else
282 #define Py_ARITHMETIC_RIGHT_SHIFT(TYPE, I, J) ((I) >> (J))
283 #endif
284
285 /* Py_FORCE_EXPANSION(X)
286 * "Simply" returns its argument. However, macro expansions within the
287 * argument are evaluated. This unfortunate trickery is needed to get
288 * token-pasting to work as desired in some cases.
289 */
290 #define Py_FORCE_EXPANSION(X) X
291
292 /* Py_SAFE_DOWNCAST(VALUE, WIDE, NARROW)
293 * Cast VALUE to type NARROW from type WIDE. In Py_DEBUG mode, this
294 * assert-fails if any information is lost.
295 * Caution:
296 * VALUE may be evaluated more than once.
297 */
298 #ifdef Py_DEBUG
299 # define Py_SAFE_DOWNCAST(VALUE, WIDE, NARROW) \
300 (assert(_Py_STATIC_CAST(WIDE, _Py_STATIC_CAST(NARROW, (VALUE))) == (VALUE)), \
301 _Py_STATIC_CAST(NARROW, (VALUE)))
302 #else
303 # define Py_SAFE_DOWNCAST(VALUE, WIDE, NARROW) _Py_STATIC_CAST(NARROW, (VALUE))
304 #endif
305
306
307 /* Py_DEPRECATED(version)
308 * Declare a variable, type, or function deprecated.
309 * The macro must be placed before the declaration.
310 * Usage:
311 * Py_DEPRECATED(3.3) extern int old_var;
312 * Py_DEPRECATED(3.4) typedef int T1;
313 * Py_DEPRECATED(3.8) PyAPI_FUNC(int) Py_OldFunction(void);
314 */
315 #if defined(__GNUC__) \
316 && ((__GNUC__ >= 4) || (__GNUC__ == 3) && (__GNUC_MINOR__ >= 1))
317 #define Py_DEPRECATED(VERSION_UNUSED) __attribute__((__deprecated__))
318 #elif defined(_MSC_VER)
319 #define Py_DEPRECATED(VERSION) __declspec(deprecated( \
320 "deprecated in " #VERSION))
321 #else
322 #define Py_DEPRECATED(VERSION_UNUSED)
323 #endif
324
325 // _Py_DEPRECATED_EXTERNALLY(version)
326 // Deprecated outside CPython core.
327 #ifdef Py_BUILD_CORE
328 #define _Py_DEPRECATED_EXTERNALLY(VERSION_UNUSED)
329 #else
330 #define _Py_DEPRECATED_EXTERNALLY(version) Py_DEPRECATED(version)
331 #endif
332
333
334 #if defined(__clang__)
335 #define _Py_COMP_DIAG_PUSH _Pragma("clang diagnostic push")
336 #define _Py_COMP_DIAG_IGNORE_DEPR_DECLS \
337 _Pragma("clang diagnostic ignored \"-Wdeprecated-declarations\"")
338 #define _Py_COMP_DIAG_POP _Pragma("clang diagnostic pop")
339 #elif defined(__GNUC__) \
340 && ((__GNUC__ >= 5) || (__GNUC__ == 4) && (__GNUC_MINOR__ >= 6))
341 #define _Py_COMP_DIAG_PUSH _Pragma("GCC diagnostic push")
342 #define _Py_COMP_DIAG_IGNORE_DEPR_DECLS \
343 _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"")
344 #define _Py_COMP_DIAG_POP _Pragma("GCC diagnostic pop")
345 #elif defined(_MSC_VER)
346 #define _Py_COMP_DIAG_PUSH __pragma(warning(push))
347 #define _Py_COMP_DIAG_IGNORE_DEPR_DECLS __pragma(warning(disable: 4996))
348 #define _Py_COMP_DIAG_POP __pragma(warning(pop))
349 #else
350 #define _Py_COMP_DIAG_PUSH
351 #define _Py_COMP_DIAG_IGNORE_DEPR_DECLS
352 #define _Py_COMP_DIAG_POP
353 #endif
354
355 /* _Py_HOT_FUNCTION
356 * The hot attribute on a function is used to inform the compiler that the
357 * function is a hot spot of the compiled program. The function is optimized
358 * more aggressively and on many target it is placed into special subsection of
359 * the text section so all hot functions appears close together improving
360 * locality.
361 *
362 * Usage:
363 * int _Py_HOT_FUNCTION x(void) { return 3; }
364 *
365 * Issue #28618: This attribute must not be abused, otherwise it can have a
366 * negative effect on performance. Only the functions were Python spend most of
367 * its time must use it. Use a profiler when running performance benchmark
368 * suite to find these functions.
369 */
370 #if defined(__GNUC__) \
371 && ((__GNUC__ >= 5) || (__GNUC__ == 4) && (__GNUC_MINOR__ >= 3))
372 #define _Py_HOT_FUNCTION __attribute__((hot))
373 #else
374 #define _Py_HOT_FUNCTION
375 #endif
376
377 // Ask the compiler to always inline a static inline function. The compiler can
378 // ignore it and decides to not inline the function.
379 //
380 // It can be used to inline performance critical static inline functions when
381 // building Python in debug mode with function inlining disabled. For example,
382 // MSC disables function inlining when building in debug mode.
383 //
384 // Marking blindly a static inline function with Py_ALWAYS_INLINE can result in
385 // worse performances (due to increased code size for example). The compiler is
386 // usually smarter than the developer for the cost/benefit analysis.
387 //
388 // If Python is built in debug mode (if the Py_DEBUG macro is defined), the
389 // Py_ALWAYS_INLINE macro does nothing.
390 //
391 // It must be specified before the function return type. Usage:
392 //
393 // static inline Py_ALWAYS_INLINE int random(void) { return 4; }
394 #if defined(Py_DEBUG)
395 // If Python is built in debug mode, usually compiler optimizations are
396 // disabled. In this case, Py_ALWAYS_INLINE can increase a lot the stack
397 // memory usage. For example, forcing inlining using gcc -O0 increases the
398 // stack usage from 6 KB to 15 KB per Python function call.
399 # define Py_ALWAYS_INLINE
400 #elif defined(__GNUC__) || defined(__clang__) || defined(__INTEL_COMPILER)
401 # define Py_ALWAYS_INLINE __attribute__((always_inline))
402 #elif defined(_MSC_VER)
403 # define Py_ALWAYS_INLINE __forceinline
404 #else
405 # define Py_ALWAYS_INLINE
406 #endif
407
408 // Py_NO_INLINE
409 // Disable inlining on a function. For example, it reduces the C stack
410 // consumption: useful on LTO+PGO builds which heavily inline code (see
411 // bpo-33720).
412 //
413 // Usage:
414 //
415 // Py_NO_INLINE static int random(void) { return 4; }
416 #if defined(__GNUC__) || defined(__clang__) || defined(__INTEL_COMPILER)
417 # define Py_NO_INLINE __attribute__ ((noinline))
418 #elif defined(_MSC_VER)
419 # define Py_NO_INLINE __declspec(noinline)
420 #else
421 # define Py_NO_INLINE
422 #endif
423
424 /**************************************************************************
425 Prototypes that are missing from the standard include files on some systems
426 (and possibly only some versions of such systems.)
427
428 Please be conservative with adding new ones, document them and enclose them
429 in platform-specific #ifdefs.
430 **************************************************************************/
431
432 #ifdef HAVE__GETPTY
433 #include <sys/types.h> /* we need to import mode_t */
434 extern char * _getpty(int *, int, mode_t, int);
435 #endif
436
437 /* On QNX 6, struct termio must be declared by including sys/termio.h
438 if TCGETA, TCSETA, TCSETAW, or TCSETAF are used. sys/termio.h must
439 be included before termios.h or it will generate an error. */
440 #if defined(HAVE_SYS_TERMIO_H) && !defined(__hpux)
441 #include <sys/termio.h>
442 #endif
443
444
445 /* On 4.4BSD-descendants, ctype functions serves the whole range of
446 * wchar_t character set rather than single byte code points only.
447 * This characteristic can break some operations of string object
448 * including str.upper() and str.split() on UTF-8 locales. This
449 * workaround was provided by Tim Robbins of FreeBSD project.
450 */
451
452 #if defined(__APPLE__)
453 # define _PY_PORT_CTYPE_UTF8_ISSUE
454 #endif
455
456 #ifdef _PY_PORT_CTYPE_UTF8_ISSUE
457 #ifndef __cplusplus
458 /* The workaround below is unsafe in C++ because
459 * the <locale> defines these symbols as real functions,
460 * with a slightly different signature.
461 * See issue #10910
462 */
463 #include <ctype.h>
464 #include <wctype.h>
465 #undef isalnum
466 #define isalnum(c) iswalnum(btowc(c))
467 #undef isalpha
468 #define isalpha(c) iswalpha(btowc(c))
469 #undef islower
470 #define islower(c) iswlower(btowc(c))
471 #undef isspace
472 #define isspace(c) iswspace(btowc(c))
473 #undef isupper
474 #define isupper(c) iswupper(btowc(c))
475 #undef tolower
476 #define tolower(c) towlower(btowc(c))
477 #undef toupper
478 #define toupper(c) towupper(btowc(c))
479 #endif
480 #endif
481
482
483 /* Declarations for symbol visibility.
484
485 PyAPI_FUNC(type): Declares a public Python API function and return type
486 PyAPI_DATA(type): Declares public Python data and its type
487 PyMODINIT_FUNC: A Python module init function. If these functions are
488 inside the Python core, they are private to the core.
489 If in an extension module, it may be declared with
490 external linkage depending on the platform.
491
492 As a number of platforms support/require "__declspec(dllimport/dllexport)",
493 we support a HAVE_DECLSPEC_DLL macro to save duplication.
494 */
495
496 /*
497 All windows ports, except cygwin, are handled in PC/pyconfig.h.
498
499 Cygwin is the only other autoconf platform requiring special
500 linkage handling and it uses __declspec().
501 */
502 #if defined(__CYGWIN__)
503 # define HAVE_DECLSPEC_DLL
504 #endif
505
506 #include "exports.h"
507
508 /* only get special linkage if built as shared or platform is Cygwin */
509 #if defined(Py_ENABLE_SHARED) || defined(__CYGWIN__)
510 # if defined(HAVE_DECLSPEC_DLL)
511 # if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
512 # define PyAPI_FUNC(RTYPE) Py_EXPORTED_SYMBOL RTYPE
513 # define PyAPI_DATA(RTYPE) extern Py_EXPORTED_SYMBOL RTYPE
514 /* module init functions inside the core need no external linkage */
515 /* except for Cygwin to handle embedding */
516 # if defined(__CYGWIN__)
517 # define PyMODINIT_FUNC Py_EXPORTED_SYMBOL PyObject*
518 # else /* __CYGWIN__ */
519 # define PyMODINIT_FUNC PyObject*
520 # endif /* __CYGWIN__ */
521 # else /* Py_BUILD_CORE */
522 /* Building an extension module, or an embedded situation */
523 /* public Python functions and data are imported */
524 /* Under Cygwin, auto-import functions to prevent compilation */
525 /* failures similar to those described at the bottom of 4.1: */
526 /* http://docs.python.org/extending/windows.html#a-cookbook-approach */
527 # if !defined(__CYGWIN__)
528 # define PyAPI_FUNC(RTYPE) Py_IMPORTED_SYMBOL RTYPE
529 # endif /* !__CYGWIN__ */
530 # define PyAPI_DATA(RTYPE) extern Py_IMPORTED_SYMBOL RTYPE
531 /* module init functions outside the core must be exported */
532 # if defined(__cplusplus)
533 # define PyMODINIT_FUNC extern "C" Py_EXPORTED_SYMBOL PyObject*
534 # else /* __cplusplus */
535 # define PyMODINIT_FUNC Py_EXPORTED_SYMBOL PyObject*
536 # endif /* __cplusplus */
537 # endif /* Py_BUILD_CORE */
538 # endif /* HAVE_DECLSPEC_DLL */
539 #endif /* Py_ENABLE_SHARED */
540
541 /* If no external linkage macros defined by now, create defaults */
542 #ifndef PyAPI_FUNC
543 # define PyAPI_FUNC(RTYPE) Py_EXPORTED_SYMBOL RTYPE
544 #endif
545 #ifndef PyAPI_DATA
546 # define PyAPI_DATA(RTYPE) extern Py_EXPORTED_SYMBOL RTYPE
547 #endif
548 #ifndef PyMODINIT_FUNC
549 # if defined(__cplusplus)
550 # define PyMODINIT_FUNC extern "C" Py_EXPORTED_SYMBOL PyObject*
551 # else /* __cplusplus */
552 # define PyMODINIT_FUNC Py_EXPORTED_SYMBOL PyObject*
553 # endif /* __cplusplus */
554 #endif
555
556 /* limits.h constants that may be missing */
557
558 #ifndef INT_MAX
559 #define INT_MAX 2147483647
560 #endif
561
562 #ifndef LONG_MAX
563 #if SIZEOF_LONG == 4
564 #define LONG_MAX 0X7FFFFFFFL
565 #elif SIZEOF_LONG == 8
566 #define LONG_MAX 0X7FFFFFFFFFFFFFFFL
567 #else
568 #error "could not set LONG_MAX in pyport.h"
569 #endif
570 #endif
571
572 #ifndef LONG_MIN
573 #define LONG_MIN (-LONG_MAX-1)
574 #endif
575
576 #ifndef LONG_BIT
577 #define LONG_BIT (8 * SIZEOF_LONG)
578 #endif
579
580 #if LONG_BIT != 8 * SIZEOF_LONG
581 /* 04-Oct-2000 LONG_BIT is apparently (mis)defined as 64 on some recent
582 * 32-bit platforms using gcc. We try to catch that here at compile-time
583 * rather than waiting for integer multiplication to trigger bogus
584 * overflows.
585 */
586 #error "LONG_BIT definition appears wrong for platform (bad gcc/glibc config?)."
587 #endif
588
589 #ifdef __cplusplus
590 }
591 #endif
592
593 /*
594 * Hide GCC attributes from compilers that don't support them.
595 */
596 #if (!defined(__GNUC__) || __GNUC__ < 2 || \
597 (__GNUC__ == 2 && __GNUC_MINOR__ < 7) )
598 #define Py_GCC_ATTRIBUTE(x)
599 #else
600 #define Py_GCC_ATTRIBUTE(x) __attribute__(x)
601 #endif
602
603 /*
604 * Specify alignment on compilers that support it.
605 */
606 #if defined(__GNUC__) && __GNUC__ >= 3
607 #define Py_ALIGNED(x) __attribute__((aligned(x)))
608 #else
609 #define Py_ALIGNED(x)
610 #endif
611
612 /* Eliminate end-of-loop code not reached warnings from SunPro C
613 * when using do{...}while(0) macros
614 */
615 #ifdef __SUNPRO_C
616 #pragma error_messages (off,E_END_OF_LOOP_CODE_NOT_REACHED)
617 #endif
618
619 #ifndef Py_LL
620 #define Py_LL(x) x##LL
621 #endif
622
623 #ifndef Py_ULL
624 #define Py_ULL(x) Py_LL(x##U)
625 #endif
626
627 #define Py_VA_COPY va_copy
628
629 /*
630 * Convenient macros to deal with endianness of the platform. WORDS_BIGENDIAN is
631 * detected by configure and defined in pyconfig.h. The code in pyconfig.h
632 * also takes care of Apple's universal builds.
633 */
634
635 #ifdef WORDS_BIGENDIAN
636 # define PY_BIG_ENDIAN 1
637 # define PY_LITTLE_ENDIAN 0
638 #else
639 # define PY_BIG_ENDIAN 0
640 # define PY_LITTLE_ENDIAN 1
641 #endif
642
643 #ifdef __ANDROID__
644 /* The Android langinfo.h header is not used. */
645 # undef HAVE_LANGINFO_H
646 # undef CODESET
647 #endif
648
649 /* Maximum value of the Windows DWORD type */
650 #define PY_DWORD_MAX 4294967295U
651
652 /* This macro used to tell whether Python was built with multithreading
653 * enabled. Now multithreading is always enabled, but keep the macro
654 * for compatibility.
655 */
656 #ifndef WITH_THREAD
657 # define WITH_THREAD
658 #endif
659
660 #ifdef WITH_THREAD
661 # ifdef Py_BUILD_CORE
662 # ifdef HAVE_THREAD_LOCAL
663 # error "HAVE_THREAD_LOCAL is already defined"
664 # endif
665 # define HAVE_THREAD_LOCAL 1
666 # ifdef thread_local
667 # define _Py_thread_local thread_local
668 # elif __STDC_VERSION__ >= 201112L && !defined(__STDC_NO_THREADS__)
669 # define _Py_thread_local _Thread_local
670 # elif defined(_MSC_VER) /* AKA NT_THREADS */
671 # define _Py_thread_local __declspec(thread)
672 # elif defined(__GNUC__) /* includes clang */
673 # define _Py_thread_local __thread
674 # else
675 // fall back to the PyThread_tss_*() API, or ignore.
676 # undef HAVE_THREAD_LOCAL
677 # endif
678 # endif
679 #endif
680
681 /* Check that ALT_SOABI is consistent with Py_TRACE_REFS:
682 ./configure --with-trace-refs should must be used to define Py_TRACE_REFS */
683 #if defined(ALT_SOABI) && defined(Py_TRACE_REFS)
684 # error "Py_TRACE_REFS ABI is not compatible with release and debug ABI"
685 #endif
686
687 #if defined(__ANDROID__) || defined(__VXWORKS__)
688 // Use UTF-8 as the locale encoding, ignore the LC_CTYPE locale.
689 // See _Py_GetLocaleEncoding(), PyUnicode_DecodeLocale()
690 // and PyUnicode_EncodeLocale().
691 # define _Py_FORCE_UTF8_LOCALE
692 #endif
693
694 #if defined(_Py_FORCE_UTF8_LOCALE) || defined(__APPLE__)
695 // Use UTF-8 as the filesystem encoding.
696 // See PyUnicode_DecodeFSDefaultAndSize(), PyUnicode_EncodeFSDefault(),
697 // Py_DecodeLocale() and Py_EncodeLocale().
698 # define _Py_FORCE_UTF8_FS_ENCODING
699 #endif
700
701 /* Mark a function which cannot return. Example:
702 PyAPI_FUNC(void) _Py_NO_RETURN PyThread_exit_thread(void);
703
704 XLC support is intentionally omitted due to bpo-40244 */
705 #ifndef _Py_NO_RETURN
706 #if defined(__clang__) || \
707 (defined(__GNUC__) && \
708 ((__GNUC__ >= 3) || \
709 (__GNUC__ == 2) && (__GNUC_MINOR__ >= 5)))
710 # define _Py_NO_RETURN __attribute__((__noreturn__))
711 #elif defined(_MSC_VER)
712 # define _Py_NO_RETURN __declspec(noreturn)
713 #else
714 # define _Py_NO_RETURN
715 #endif
716 #endif
717
718
719 // Preprocessor check for a builtin preprocessor function. Always return 0
720 // if __has_builtin() macro is not defined.
721 //
722 // __has_builtin() is available on clang and GCC 10.
723 #ifdef __has_builtin
724 # define _Py__has_builtin(x) __has_builtin(x)
725 #else
726 # define _Py__has_builtin(x) 0
727 #endif
728
729 // _Py_TYPEOF(expr) gets the type of an expression.
730 //
731 // Example: _Py_TYPEOF(x) x_copy = (x);
732 //
733 // The macro is only defined if GCC or clang compiler is used.
734 #if defined(__GNUC__) || defined(__clang__)
735 # define _Py_TYPEOF(expr) __typeof__(expr)
736 #endif
737
738
739 /* A convenient way for code to know if sanitizers are enabled. */
740 #if defined(__has_feature)
741 # if __has_feature(memory_sanitizer)
742 # if !defined(_Py_MEMORY_SANITIZER)
743 # define _Py_MEMORY_SANITIZER
744 # endif
745 # endif
746 # if __has_feature(address_sanitizer)
747 # if !defined(_Py_ADDRESS_SANITIZER)
748 # define _Py_ADDRESS_SANITIZER
749 # endif
750 # endif
751 #elif defined(__GNUC__)
752 # if defined(__SANITIZE_ADDRESS__)
753 # define _Py_ADDRESS_SANITIZER
754 # endif
755 #endif
756
757
758 /* AIX has __bool__ redefined in it's system header file. */
759 #if defined(_AIX) && defined(__bool__)
760 #undef __bool__
761 #endif
762
763 // Make sure we have maximum alignment, even if the current compiler
764 // does not support max_align_t. Note that:
765 // - Autoconf reports alignment of unknown types to 0.
766 // - 'long double' has maximum alignment on *most* platforms,
767 // looks like the best we can do for pre-C11 compilers.
768 // - The value is tested, see test_alignof_max_align_t
769 #if !defined(ALIGNOF_MAX_ALIGN_T) || ALIGNOF_MAX_ALIGN_T == 0
770 # undef ALIGNOF_MAX_ALIGN_T
771 # define ALIGNOF_MAX_ALIGN_T _Alignof(long double)
772 #endif
773
774 #endif /* Py_PYPORT_H */
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