mirror of
https://github.com/jart/cosmopolitan.git
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d26d7ae0e4
Building o//third_party/python now takes 5 seconds on my PC This change works towards modifying Python to use runtime dispatching when appropriate. For example, when loading the magnums in the socket module, it's a good idea to check if the magnum is zero, because that means the local system platform doesn't support it.
513 lines
18 KiB
C
513 lines
18 KiB
C
#ifndef Py_PYPORT_H
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#define Py_PYPORT_H
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#include "libc/calls/calls.h"
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#include "libc/calls/termios.h"
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#include "libc/calls/weirdtypes.h"
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#include "libc/limits.h"
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#include "libc/math.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/clock.h"
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#include "libc/sysv/consts/itimer.h"
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#include "libc/sysv/consts/s.h"
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#include "libc/sysv/consts/sched.h"
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#include "libc/sysv/consts/termios.h"
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#include "libc/time/time.h"
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#include "third_party/python/pyconfig.h"
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/* clang-format off */
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/**************************************************************************
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Symbols and macros to supply platform-independent interfaces to basic
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C language & library operations whose spellings vary across platforms.
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Please try to make documentation here as clear as possible: by definition,
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the stuff here is trying to illuminate C's darkest corners.
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Config #defines referenced here:
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SIGNED_RIGHT_SHIFT_ZERO_FILLS
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Meaning: To be defined iff i>>j does not extend the sign bit when i is a
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signed integral type and i < 0.
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Used in: Py_ARITHMETIC_RIGHT_SHIFT
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Py_DEBUG
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Meaning: Extra checks compiled in for debug mode.
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Used in: Py_SAFE_DOWNCAST
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**************************************************************************/
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/* typedefs for some C9X-defined synonyms for integral types.
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*
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* The names in Python are exactly the same as the C9X names, except with a
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* Py_ prefix. Until C9X is universally implemented, this is the only way
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* to ensure that Python gets reliable names that don't conflict with names
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* in non-Python code that are playing their own tricks to define the C9X
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* names.
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*
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* NOTE: don't go nuts here! Python has no use for *most* of the C9X
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* integral synonyms. Only define the ones we actually need.
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*/
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/* long long is required. Ensure HAVE_LONG_LONG is defined for compatibility. */
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#ifndef HAVE_LONG_LONG
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#define HAVE_LONG_LONG 1
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#endif
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#ifndef PY_LONG_LONG
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#define PY_LONG_LONG long long
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/* If LLONG_MAX is defined in limits.h, use that. */
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#define PY_LLONG_MIN LLONG_MIN
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#define PY_LLONG_MAX LLONG_MAX
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#define PY_ULLONG_MAX ULLONG_MAX
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#endif
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#define PY_UINT32_T uint32_t
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#define PY_UINT64_T uint64_t
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/* Signed variants of the above */
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#define PY_INT32_T int32_t
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#define PY_INT64_T int64_t
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/* If PYLONG_BITS_IN_DIGIT is not defined then we'll use 30-bit digits if all
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the necessary integer types are available, and we're on a 64-bit platform
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(as determined by SIZEOF_VOID_P); otherwise we use 15-bit digits. */
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#ifndef PYLONG_BITS_IN_DIGIT
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#if SIZEOF_VOID_P >= 8
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#define PYLONG_BITS_IN_DIGIT 30
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#else
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#define PYLONG_BITS_IN_DIGIT 15
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#endif
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#endif
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/* uintptr_t is the C9X name for an unsigned integral type such that a
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* legitimate void* can be cast to uintptr_t and then back to void* again
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* without loss of information. Similarly for intptr_t, wrt a signed
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* integral type.
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*/
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typedef uintptr_t Py_uintptr_t;
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typedef intptr_t Py_intptr_t;
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/* Py_ssize_t is a signed integral type such that sizeof(Py_ssize_t) ==
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* sizeof(size_t). C99 doesn't define such a thing directly (size_t is an
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* unsigned integral type). See PEP 353 for details.
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*/
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#ifdef HAVE_SSIZE_T
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typedef ssize_t Py_ssize_t;
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#elif SIZEOF_VOID_P == SIZEOF_SIZE_T
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typedef Py_intptr_t Py_ssize_t;
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#else
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#error "Python needs a typedef for Py_ssize_t in pyport.h."
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#endif
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/* Py_hash_t is the same size as a pointer. */
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#define SIZEOF_PY_HASH_T SIZEOF_SIZE_T
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typedef Py_ssize_t Py_hash_t;
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/* Py_uhash_t is the unsigned equivalent needed to calculate numeric hash. */
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#define SIZEOF_PY_UHASH_T SIZEOF_SIZE_T
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typedef size_t Py_uhash_t;
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/* Only used for compatibility with code that may not be PY_SSIZE_T_CLEAN. */
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#ifdef PY_SSIZE_T_CLEAN
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typedef Py_ssize_t Py_ssize_clean_t;
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#else
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typedef int Py_ssize_clean_t;
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#endif
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/* Largest possible value of size_t. */
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#define PY_SIZE_MAX SIZE_MAX
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/* Largest positive value of type Py_ssize_t. */
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#define PY_SSIZE_T_MAX ((Py_ssize_t)(((size_t)-1) >> 1))
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/* Smallest negative value of type Py_ssize_t. */
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#define PY_SSIZE_T_MIN (-PY_SSIZE_T_MAX - 1)
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/* PY_FORMAT_SIZE_T is a platform-specific modifier for use in a printf
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* format to convert an argument with the width of a size_t or Py_ssize_t.
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* C99 introduced "z" for this purpose, but not all platforms support that;
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* e.g., MS compilers use "I" instead.
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*
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* These "high level" Python format functions interpret "z" correctly on
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* all platforms (Python interprets the format string itself, and does whatever
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* the platform C requires to convert a size_t/Py_ssize_t argument):
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*
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* PyBytes_FromFormat
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* PyErr_Format
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* PyBytes_FromFormatV
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* PyUnicode_FromFormatV
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*
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* Lower-level uses require that you interpolate the correct format modifier
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* yourself (e.g., calling printf, fprintf, sprintf, PyOS_snprintf); for
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* example,
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*
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* Py_ssize_t index;
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* fprintf(stderr, "index %" PY_FORMAT_SIZE_T "d sucks\n", index);
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*
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* That will expand to %ld, or %Id, or to something else correct for a
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* Py_ssize_t on the platform.
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*/
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#ifndef PY_FORMAT_SIZE_T
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#if SIZEOF_SIZE_T == SIZEOF_INT && !defined(__APPLE__)
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#define PY_FORMAT_SIZE_T ""
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#elif SIZEOF_SIZE_T == SIZEOF_LONG
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#define PY_FORMAT_SIZE_T "l"
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#elif defined(MS_WINDOWS)
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#define PY_FORMAT_SIZE_T "I"
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#else
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#error "This platform's pyconfig.h needs to define PY_FORMAT_SIZE_T"
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#endif
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#endif
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/* Py_LOCAL can be used instead of static to get the fastest possible calling
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* convention for functions that are local to a given module.
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*
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* Py_LOCAL_INLINE does the same thing, and also explicitly requests inlining,
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* for platforms that support that.
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*
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* If PY_LOCAL_AGGRESSIVE is defined before python.h is included, more
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* "aggressive" inlining/optimization is enabled for the entire module. This
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* may lead to code bloat, and may slow things down for those reasons. It may
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* also lead to errors, if the code relies on pointer aliasing. Use with
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* care.
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*
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* NOTE: You can only use this for functions that are entirely local to a
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* module; functions that are exported via method tables, callbacks, etc,
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* should keep using static.
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*/
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#if defined(_MSC_VER)
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#if defined(PY_LOCAL_AGGRESSIVE)
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/* enable more aggressive optimization for visual studio */
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#pragma optimize("agtw", on)
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#endif
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/* ignore warnings if the compiler decides not to inline a function */
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#pragma warning(disable : 4710)
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/* fastest possible local call under MSVC */
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#define Py_LOCAL(type) static type __fastcall
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#define Py_LOCAL_INLINE(type) static __inline type __fastcall
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#elif defined(USE_INLINE)
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#define Py_LOCAL(type) static type
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#define Py_LOCAL_INLINE(type) static inline type
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#else
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#define Py_LOCAL(type) static type
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#define Py_LOCAL_INLINE(type) static type
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#endif
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/* Py_MEMCPY is kept for backwards compatibility,
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* see https://bugs.python.org/issue28126 */
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#define Py_MEMCPY memcpy
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COSMOPOLITAN_C_START_
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/* Py_ARITHMETIC_RIGHT_SHIFT
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* C doesn't define whether a right-shift of a signed integer sign-extends
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* or zero-fills. Here a macro to force sign extension:
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* Py_ARITHMETIC_RIGHT_SHIFT(TYPE, I, J)
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* Return I >> J, forcing sign extension. Arithmetically, return the
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* floor of I/2**J.
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* Requirements:
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* I should have signed integer type. In the terminology of C99, this can
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* be either one of the five standard signed integer types (signed char,
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* short, int, long, long long) or an extended signed integer type.
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* J is an integer >= 0 and strictly less than the number of bits in the
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* type of I (because C doesn't define what happens for J outside that
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* range either).
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* TYPE used to specify the type of I, but is now ignored. It's been left
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* in for backwards compatibility with versions <= 2.6 or 3.0.
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* Caution:
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* I may be evaluated more than once.
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*/
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#ifdef SIGNED_RIGHT_SHIFT_ZERO_FILLS
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#define Py_ARITHMETIC_RIGHT_SHIFT(TYPE, I, J) \
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((I) < 0 ? -1 - ((-1 - (I)) >> (J)) : (I) >> (J))
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#else
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#define Py_ARITHMETIC_RIGHT_SHIFT(TYPE, I, J) ((I) >> (J))
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#endif
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/* Py_FORCE_EXPANSION(X)
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* "Simply" returns its argument. However, macro expansions within the
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* argument are evaluated. This unfortunate trickery is needed to get
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* token-pasting to work as desired in some cases.
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*/
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#define Py_FORCE_EXPANSION(X) X
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/* Py_SAFE_DOWNCAST(VALUE, WIDE, NARROW)
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* Cast VALUE to type NARROW from type WIDE. In Py_DEBUG mode, this
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* assert-fails if any information is lost.
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* Caution:
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* VALUE may be evaluated more than once.
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*/
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#ifdef Py_DEBUG
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#define Py_SAFE_DOWNCAST(VALUE, WIDE, NARROW) \
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(assert((WIDE)(NARROW)(VALUE) == (VALUE)), (NARROW)(VALUE))
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#else
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#define Py_SAFE_DOWNCAST(VALUE, WIDE, NARROW) (NARROW)(VALUE)
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#endif
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/* Py_SET_ERRNO_ON_MATH_ERROR(x)
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* If a libm function did not set errno, but it looks like the result
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* overflowed or not-a-number, set errno to ERANGE or EDOM. Set errno
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* to 0 before calling a libm function, and invoke this macro after,
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* passing the function result.
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* Caution:
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* This isn't reliable. See Py_OVERFLOWED comments.
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* X is evaluated more than once.
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*/
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#if defined(__FreeBSD__) || defined(__OpenBSD__) || \
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(defined(__hpux) && defined(__ia64))
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#define _Py_SET_EDOM_FOR_NAN(X) \
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if (isnan(X)) errno = EDOM;
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#else
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#define _Py_SET_EDOM_FOR_NAN(X) ;
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#endif
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#define Py_SET_ERRNO_ON_MATH_ERROR(X) \
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do { \
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if (errno == 0) { \
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if ((X) == Py_HUGE_VAL || (X) == -Py_HUGE_VAL) \
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errno = ERANGE; \
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else \
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_Py_SET_EDOM_FOR_NAN(X) \
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} \
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} while (0)
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/* Py_SET_ERANGE_ON_OVERFLOW(x)
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* An alias of Py_SET_ERRNO_ON_MATH_ERROR for backward-compatibility.
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*/
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#define Py_SET_ERANGE_IF_OVERFLOW(X) Py_SET_ERRNO_ON_MATH_ERROR(X)
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/* Py_ADJUST_ERANGE1(x)
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* Py_ADJUST_ERANGE2(x, y)
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* Set errno to 0 before calling a libm function, and invoke one of these
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* macros after, passing the function result(s) (Py_ADJUST_ERANGE2 is useful
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* for functions returning complex results). This makes two kinds of
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* adjustments to errno: (A) If it looks like the platform libm set
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* errno=ERANGE due to underflow, clear errno. (B) If it looks like the
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* platform libm overflowed but didn't set errno, force errno to ERANGE. In
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* effect, we're trying to force a useful implementation of C89 errno
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* behavior.
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* Caution:
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* This isn't reliable. See Py_OVERFLOWED comments.
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* X and Y may be evaluated more than once.
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*/
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#define Py_ADJUST_ERANGE1(X) \
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do { \
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if (errno == 0) { \
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if ((X) == Py_HUGE_VAL || (X) == -Py_HUGE_VAL) errno = ERANGE; \
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} else if (errno == ERANGE && (X) == 0.0) \
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errno = 0; \
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} while (0)
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#define Py_ADJUST_ERANGE2(X, Y) \
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do { \
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if ((X) == Py_HUGE_VAL || (X) == -Py_HUGE_VAL || (Y) == Py_HUGE_VAL || \
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(Y) == -Py_HUGE_VAL) { \
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if (errno == 0) errno = ERANGE; \
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} else if (errno == ERANGE) \
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errno = 0; \
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} while (0)
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/* The functions _Py_dg_strtod and _Py_dg_dtoa in Python/dtoa.c (which are
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* required to support the short float repr introduced in Python 3.1) require
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* that the floating-point unit that's being used for arithmetic operations
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* on C doubles is set to use 53-bit precision. It also requires that the
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* FPU rounding mode is round-half-to-even, but that's less often an issue.
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*
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* If your FPU isn't already set to 53-bit precision/round-half-to-even, and
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* you want to make use of _Py_dg_strtod and _Py_dg_dtoa, then you should
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*
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* #define HAVE_PY_SET_53BIT_PRECISION 1
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*
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* and also give appropriate definitions for the following three macros:
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*
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* _PY_SET_53BIT_PRECISION_START : store original FPU settings, and
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* set FPU to 53-bit precision/round-half-to-even
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* _PY_SET_53BIT_PRECISION_END : restore original FPU settings
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* _PY_SET_53BIT_PRECISION_HEADER : any variable declarations needed to
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* use the two macros above.
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*
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* The macros are designed to be used within a single C function: see
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* Python/pystrtod.c for an example of their use.
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*/
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/* get and set x87 control word for gcc/x86 */
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#ifdef HAVE_GCC_ASM_FOR_X87
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#define HAVE_PY_SET_53BIT_PRECISION 1
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/* _Py_get/set_387controlword functions are defined in Python/pymath.c */
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#define _Py_SET_53BIT_PRECISION_HEADER \
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unsigned short old_387controlword, new_387controlword
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#define _Py_SET_53BIT_PRECISION_START \
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do { \
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old_387controlword = _Py_get_387controlword(); \
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new_387controlword = (old_387controlword & ~0x0f00) | 0x0200; \
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if (new_387controlword != old_387controlword) \
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_Py_set_387controlword(new_387controlword); \
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} while (0)
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#define _Py_SET_53BIT_PRECISION_END \
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if (new_387controlword != old_387controlword) \
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_Py_set_387controlword(old_387controlword)
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#endif
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/* get and set x87 control word for VisualStudio/x86 */
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/* default definitions are empty */
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#ifndef HAVE_PY_SET_53BIT_PRECISION
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#define _Py_SET_53BIT_PRECISION_HEADER
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#define _Py_SET_53BIT_PRECISION_START
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#define _Py_SET_53BIT_PRECISION_END
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#endif
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/* If we can't guarantee 53-bit precision, don't use the code
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in Python/dtoa.c, but fall back to standard code. This
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means that repr of a float will be long (17 sig digits).
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Realistically, there are two things that could go wrong:
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(1) doubles aren't IEEE 754 doubles, or
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(2) we're on x86 with the rounding precision set to 64-bits
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(extended precision), and we don't know how to change
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the rounding precision.
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*/
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#if !defined(DOUBLE_IS_LITTLE_ENDIAN_IEEE754) && \
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!defined(DOUBLE_IS_BIG_ENDIAN_IEEE754) && \
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!defined(DOUBLE_IS_ARM_MIXED_ENDIAN_IEEE754)
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#define PY_NO_SHORT_FLOAT_REPR
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#endif
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/* double rounding is symptomatic of use of extended precision on x86. If
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we're seeing double rounding, and we don't have any mechanism available for
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changing the FPU rounding precision, then don't use Python/dtoa.c. */
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#if defined(X87_DOUBLE_ROUNDING) && !defined(HAVE_PY_SET_53BIT_PRECISION)
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#define PY_NO_SHORT_FLOAT_REPR
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#endif
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/* Py_DEPRECATED(version)
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* Declare a variable, type, or function deprecated.
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* Usage:
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* extern int old_var Py_DEPRECATED(2.3);
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* typedef int T1 Py_DEPRECATED(2.4);
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* extern int x() Py_DEPRECATED(2.5);
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*/
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#if defined(__GNUC__) && \
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((__GNUC__ >= 4) || (__GNUC__ == 3) && (__GNUC_MINOR__ >= 1))
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#define Py_DEPRECATED(VERSION_UNUSED) __attribute__((__deprecated__))
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#else
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#define Py_DEPRECATED(VERSION_UNUSED)
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#endif
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/**************************************************************************
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Prototypes that are missing from the standard include files on some systems
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(and possibly only some versions of such systems.)
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Please be conservative with adding new ones, document them and enclose them
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in platform-specific #ifdefs.
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**************************************************************************/
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#ifdef SOLARIS
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/* Unchecked */
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extern int gethostname(char *, int);
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#endif
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#ifdef HAVE__GETPTY
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extern char *_getpty(int *, int, mode_t, int);
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#endif
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#if defined(HAVE_OPENPTY) || defined(HAVE_FORKPTY)
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#if !defined(HAVE_PTY_H) && !defined(HAVE_LIBUTIL_H)
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/* BSDI does not supply a prototype for the 'openpty' and 'forkpty'
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functions, even though they are included in libutil. */
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extern int openpty(int *, int *, char *, struct termios *, struct winsize *);
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extern pid_t forkpty(int *, char *, struct termios *, struct winsize *);
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#endif /* !defined(HAVE_PTY_H) && !defined(HAVE_LIBUTIL_H) */
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#endif /* defined(HAVE_OPENPTY) || defined(HAVE_FORKPTY) */
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/* Declarations for symbol visibility.
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PyAPI_FUNC(type): Declares a public Python API function and return type
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PyAPI_DATA(type): Declares public Python data and its type
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PyMODINIT_FUNC: A Python module init function. If these functions are
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inside the Python core, they are private to the core.
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If in an extension module, it may be declared with
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external linkage depending on the platform.
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As a number of platforms support/require "__declspec(dllimport/dllexport)",
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we support a HAVE_DECLSPEC_DLL macro to save duplication.
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*/
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#define PyAPI_FUNC(RTYPE) RTYPE
|
|
#define PyAPI_DATA(RTYPE) extern RTYPE
|
|
#ifdef __cplusplus
|
|
#define PyMODINIT_FUNC extern "C" PyObject *
|
|
#else
|
|
#define PyMODINIT_FUNC PyObject *
|
|
#endif
|
|
|
|
/* limits.h constants that may be missing */
|
|
|
|
#ifndef LONG_BIT
|
|
#define LONG_BIT (8 * SIZEOF_LONG)
|
|
#endif
|
|
|
|
#if LONG_BIT != 8 * SIZEOF_LONG
|
|
/* 04-Oct-2000 LONG_BIT is apparently (mis)defined as 64 on some recent
|
|
* 32-bit platforms using gcc. We try to catch that here at compile-time
|
|
* rather than waiting for integer multiplication to trigger bogus
|
|
* overflows.
|
|
*/
|
|
#error "LONG_BIT definition appears wrong for platform (bad gcc/glibc config?)."
|
|
#endif
|
|
|
|
COSMOPOLITAN_C_END_
|
|
|
|
/*
|
|
* Hide GCC attributes from compilers that don't support them.
|
|
*/
|
|
#if (!defined(__GNUC__) || __GNUC__ < 2 || \
|
|
(__GNUC__ == 2 && __GNUC_MINOR__ < 7))
|
|
#define Py_GCC_ATTRIBUTE(x)
|
|
#else
|
|
#define Py_GCC_ATTRIBUTE(x) __attribute__(x)
|
|
#endif
|
|
|
|
/*
|
|
* Specify alignment on compilers that support it.
|
|
*/
|
|
#if defined(__GNUC__) && __GNUC__ >= 3
|
|
#define Py_ALIGNED(x) __attribute__((aligned(x)))
|
|
#else
|
|
#define Py_ALIGNED(x)
|
|
#endif
|
|
|
|
/* Eliminate end-of-loop code not reached warnings from SunPro C
|
|
* when using do{...}while(0) macros
|
|
*/
|
|
#ifdef __SUNPRO_C
|
|
#pragma error_messages(off, E_END_OF_LOOP_CODE_NOT_REACHED)
|
|
#endif
|
|
|
|
#ifndef Py_LL
|
|
#define Py_LL(x) x##LL
|
|
#endif
|
|
|
|
#ifndef Py_ULL
|
|
#define Py_ULL(x) Py_LL(x##U)
|
|
#endif
|
|
|
|
#define Py_VA_COPY va_copy
|
|
|
|
/*
|
|
* Convenient macros to deal with endianness of the platform. WORDS_BIGENDIAN is
|
|
* detected by configure and defined in pyconfig.h. The code in pyconfig.h
|
|
* also takes care of Apple's universal builds.
|
|
*/
|
|
|
|
#ifdef WORDS_BIGENDIAN
|
|
#define PY_BIG_ENDIAN 1
|
|
#define PY_LITTLE_ENDIAN 0
|
|
#else
|
|
#define PY_BIG_ENDIAN 0
|
|
#define PY_LITTLE_ENDIAN 1
|
|
#endif
|
|
|
|
#define _Py_BEGIN_SUPPRESS_IPH
|
|
#define _Py_END_SUPPRESS_IPH
|
|
|
|
#endif /* Py_PYPORT_H */
|