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✏️ pymacro.h

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#ifndef Py_PYMACRO_H
#define Py_PYMACRO_H

// gh-91782: On FreeBSD 12, if the _POSIX_C_SOURCE and _XOPEN_SOURCE macros are
// defined, <sys/cdefs.h> disables C11 support and <assert.h> does not define
// the static_assert() macro.
// https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255290
//
// macOS <= 10.10 doesn't define static_assert in assert.h at all despite
// having C11 compiler support.
//
// static_assert is defined in glibc from version 2.16. Compiler support for
// the C11 _Static_assert keyword is in gcc >= 4.6.
//
// MSVC makes static_assert a keyword in C11-17, contrary to the standards.
//
// In C++11 and C2x, static_assert is a keyword, redefining is undefined
// behaviour. So only define if building as C, not C++ (if __cplusplus is
// not defined), and only for C11-17.
#if !defined(static_assert) && (defined(__GNUC__) || defined(__clang__)) \
     && !defined(__cplusplus) && defined(__STDC_VERSION__) \
     && __STDC_VERSION__ >= 201112L && __STDC_VERSION__ <= 201710L
#  define static_assert _Static_assert
#endif

/* Minimum value between x and y */
#define Py_MIN(x, y) (((x) > (y)) ? (y) : (x))

/* Maximum value between x and y */
#define Py_MAX(x, y) (((x) > (y)) ? (x) : (y))

/* Absolute value of the number x */
#define Py_ABS(x) ((x) < 0 ? -(x) : (x))

#define _Py_XSTRINGIFY(x) #x

/* Convert the argument to a string. For example, Py_STRINGIFY(123) is replaced
   with "123" by the preprocessor. Defines are also replaced by their value.
   For example Py_STRINGIFY(__LINE__) is replaced by the line number, not
   by "__LINE__". */
#define Py_STRINGIFY(x) _Py_XSTRINGIFY(x)

/* Get the size of a structure member in bytes */
#define Py_MEMBER_SIZE(type, member) sizeof(((type *)0)->member)

/* Argument must be a char or an int in [-128, 127] or [0, 255]. */
#define Py_CHARMASK(c) ((unsigned char)((c) & 0xff))

/* Assert a build-time dependency, as an expression.

Your compile will fail if the condition isn't true, or can't be evaluated
   by the compiler. This can be used in an expression: its value is 0.

Example:

#define foo_to_char(foo)  \
       ((char *)(foo)        \
        + Py_BUILD_ASSERT_EXPR(offsetof(struct foo, string) == 0))

Written by Rusty Russell, public domain, http://ccodearchive.net/ */
#define Py_BUILD_ASSERT_EXPR(cond) \
    (sizeof(char [1 - 2*!(cond)]) - 1)

#define Py_BUILD_ASSERT(cond)  do {         \
        (void)Py_BUILD_ASSERT_EXPR(cond);   \
    } while(0)

/* Get the number of elements in a visible array

This does not work on pointers, or arrays declared as [], or function
   parameters. With correct compiler support, such usage will cause a build
   error (see Py_BUILD_ASSERT_EXPR).

Written by Rusty Russell, public domain, http://ccodearchive.net/

Requires at GCC 3.1+ */
#if (defined(__GNUC__) && !defined(__STRICT_ANSI__) && \
    (((__GNUC__ == 3) && (__GNUC_MINOR__ >= 1)) || (__GNUC__ >= 4)))
/* Two gcc extensions.
   &a[0] degrades to a pointer: a different type from an array */
#define Py_ARRAY_LENGTH(array) \
    (sizeof(array) / sizeof((array)[0]) \
     + Py_BUILD_ASSERT_EXPR(!__builtin_types_compatible_p(typeof(array), \
                                                          typeof(&(array)[0]))))
#else
#define Py_ARRAY_LENGTH(array) \
    (sizeof(array) / sizeof((array)[0]))
#endif

/* Define macros for inline documentation. */
#define PyDoc_VAR(name) static const char name[]
#define PyDoc_STRVAR(name,str) PyDoc_VAR(name) = PyDoc_STR(str)
#ifdef WITH_DOC_STRINGS
#define PyDoc_STR(str) str
#else
#define PyDoc_STR(str) ""
#endif

/* Below "a" is a power of 2. */
/* Round down size "n" to be a multiple of "a". */
#define _Py_SIZE_ROUND_DOWN(n, a) ((size_t)(n) & ~(size_t)((a) - 1))
/* Round up size "n" to be a multiple of "a". */
#define _Py_SIZE_ROUND_UP(n, a) (((size_t)(n) + \
        (size_t)((a) - 1)) & ~(size_t)((a) - 1))
/* Round pointer "p" down to the closest "a"-aligned address <= "p". */
#define _Py_ALIGN_DOWN(p, a) ((void *)((uintptr_t)(p) & ~(uintptr_t)((a) - 1)))
/* Round pointer "p" up to the closest "a"-aligned address >= "p". */
#define _Py_ALIGN_UP(p, a) ((void *)(((uintptr_t)(p) + \
        (uintptr_t)((a) - 1)) & ~(uintptr_t)((a) - 1)))
/* Check if pointer "p" is aligned to "a"-bytes boundary. */
#define _Py_IS_ALIGNED(p, a) (!((uintptr_t)(p) & (uintptr_t)((a) - 1)))

/* Use this for unused arguments in a function definition to silence compiler
 * warnings. Example:
 *
 * int func(int a, int Py_UNUSED(b)) { return a; }
 */
#if defined(__GNUC__) || defined(__clang__)
#  define Py_UNUSED(name) _unused_ ## name __attribute__((unused))
#elif defined(_MSC_VER)
   // Disable warning C4100: unreferenced formal parameter,
   // declare the parameter,
   // restore old compiler warnings.
#  define Py_UNUSED(name) \
        __pragma(warning(push)) \
        __pragma(warning(suppress: 4100)) \
        _unused_ ## name \
        __pragma(warning(pop))
#else
#  define Py_UNUSED(name) _unused_ ## name
#endif

#if defined(RANDALL_WAS_HERE)
#  define Py_UNREACHABLE() \
    Py_FatalError( \
        "If you're seeing this, the code is in what I thought was\n" \
        "an unreachable state.\n\n" \
        "I could give you advice for what to do, but honestly, why\n" \
        "should you trust me?  I clearly screwed this up.  I'm writing\n" \
        "a message that should never appear, yet I know it will\n" \
        "probably appear someday.\n\n" \
        "On a deep level, I know I'm not up to this task.\n" \
        "I'm so sorry.\n" \
        "https://xkcd.com/2200")
#elif defined(Py_DEBUG)
#  define Py_UNREACHABLE() \
    Py_FatalError( \
        "We've reached an unreachable state. Anything is possible.\n" \
        "The limits were in our heads all along. Follow your dreams.\n" \
        "https://xkcd.com/2200")
#elif defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5))
#  define Py_UNREACHABLE() __builtin_unreachable()
#elif defined(__clang__) || defined(__INTEL_COMPILER)
#  define Py_UNREACHABLE() __builtin_unreachable()
#elif defined(_MSC_VER)
#  define Py_UNREACHABLE() __assume(0)
#else
#  define Py_UNREACHABLE() \
    Py_FatalError("Unreachable C code path reached")
#endif

// Prevent using an expression as a l-value.
// For example, "int x; _Py_RVALUE(x) = 1;" fails with a compiler error.
#define _Py_RVALUE(EXPR) ((void)0, (EXPR))

// Return non-zero if the type is signed, return zero if it's unsigned.
// Use "<= 0" rather than "< 0" to prevent the compiler warning:
// "comparison of unsigned expression in '< 0' is always false".
#define _Py_IS_TYPE_SIGNED(type) ((type)(-1) <= 0)

#endif /* Py_PYMACRO_H */

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✏️ pymacro.h