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1: #ifndef Py_PYMACRO_H 2: #define Py_PYMACRO_H 3: 4: /* Minimum value between x and y */ 5: #define Py_MIN(x, y) (((x) > (y)) ? (y) : (x)) 6: 7: /* Maximum value between x and y */ 8: #define Py_MAX(x, y) (((x) > (y)) ? (x) : (y)) 9: 10: /* Absolute value of the number x */ 11: #define Py_ABS(x) ((x) < 0 ? -(x) : (x)) 12: 13: #define _Py_XSTRINGIFY(x) #x 14: 15: /* Convert the argument to a string. For example, Py_STRINGIFY(123) is replaced 16: with "123" by the preprocessor. Defines are also replaced by their value. 17: For example Py_STRINGIFY(__LINE__) is replaced by the line number, not 18: by "__LINE__". */ 19: #define Py_STRINGIFY(x) _Py_XSTRINGIFY(x) 20: 21: /* Get the size of a structure member in bytes */ 22: #define Py_MEMBER_SIZE(type, member) sizeof(((type *)0)->member) 23: 24: /* Argument must be a char or an int in [-128, 127] or [0, 255]. */ 25: #define Py_CHARMASK(c) ((unsigned char)((c) & 0xff)) 26: 27: /* Assert a build-time dependency, as an expression. 28: 29: Your compile will fail if the condition isn't true, or can't be evaluated 30: by the compiler. This can be used in an expression: its value is 0. 31: 32: Example: 33: 34: #define foo_to_char(foo) \ 35: ((char *)(foo) \ 36: + Py_BUILD_ASSERT_EXPR(offsetof(struct foo, string) == 0)) 37: 38: Written by Rusty Russell, public domain, http://ccodearchive.net/ */ 39: #define Py_BUILD_ASSERT_EXPR(cond) \ 40: (sizeof(char [1 - 2*!(cond)]) - 1) 41: 42: #define Py_BUILD_ASSERT(cond) do { \ 43: (void)Py_BUILD_ASSERT_EXPR(cond); \ 44: } while(0) 45: 46: /* Get the number of elements in a visible array 47: 48: This does not work on pointers, or arrays declared as [], or function 49: parameters. With correct compiler support, such usage will cause a build 50: error (see Py_BUILD_ASSERT_EXPR). 51: 52: Written by Rusty Russell, public domain, http://ccodearchive.net/ 53: 54: Requires at GCC 3.1+ */ 55: #if (defined(__GNUC__) && !defined(__STRICT_ANSI__) && \ 56: (((__GNUC__ == 3) && (__GNU_MINOR__ >= 1)) || (__GNUC__ >= 4))) 57: /* Two gcc extensions. 58: &a[0] degrades to a pointer: a different type from an array */ 59: #define Py_ARRAY_LENGTH(array) \ 60: (sizeof(array) / sizeof((array)[0]) \ 61: + Py_BUILD_ASSERT_EXPR(!__builtin_types_compatible_p(typeof(array), \ 62: typeof(&(array)[0])))) 63: #else 64: #define Py_ARRAY_LENGTH(array) \ 65: (sizeof(array) / sizeof((array)[0])) 66: #endif 67: 68: 69: /* Define macros for inline documentation. */ 70: #define PyDoc_VAR(name) static char name[] 71: #define PyDoc_STRVAR(name,str) PyDoc_VAR(name) = PyDoc_STR(str) 72: #ifdef WITH_DOC_STRINGS 73: #define PyDoc_STR(str) str 74: #else 75: #define PyDoc_STR(str) "" 76: #endif 77: 78: /* Below "a" is a power of 2. */ 79: /* Round down size "n" to be a multiple of "a". */ 80: #define _Py_SIZE_ROUND_DOWN(n, a) ((size_t)(n) & ~(size_t)((a) - 1)) 81: /* Round up size "n" to be a multiple of "a". */ 82: #define _Py_SIZE_ROUND_UP(n, a) (((size_t)(n) + \ 83: (size_t)((a) - 1)) & ~(size_t)((a) - 1)) 84: /* Round pointer "p" down to the closest "a"-aligned address <= "p". */ 85: #define _Py_ALIGN_DOWN(p, a) ((void *)((uintptr_t)(p) & ~(uintptr_t)((a) - 1))) 86: /* Round pointer "p" up to the closest "a"-aligned address >= "p". */ 87: #define _Py_ALIGN_UP(p, a) ((void *)(((uintptr_t)(p) + \ 88: (uintptr_t)((a) - 1)) & ~(uintptr_t)((a) - 1))) 89: /* Check if pointer "p" is aligned to "a"-bytes boundary. */ 90: #define _Py_IS_ALIGNED(p, a) (!((uintptr_t)(p) & (uintptr_t)((a) - 1))) 91: 92: #ifdef __GNUC__ 93: #define Py_UNUSED(name) _unused_ ## name __attribute__((unused)) 94: #else 95: #define Py_UNUSED(name) _unused_ ## name 96: #endif 97: 98: #endif /* Py_PYMACRO_H */ 99: