[thirdparty/systemd.git] / src / basic / macro.h

#pragma once

/***
  This file is part of systemd.

  Copyright 2010 Lennart Poettering

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation; either version 2.1 of the License, or
  (at your option) any later version.

  systemd is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/

#include <assert.h>
#include <inttypes.h>
#include <stdbool.h>
#include <sys/param.h>
#include <sys/sysmacros.h>
#include <sys/types.h>

#define _printf_(a,b) __attribute__ ((format (printf, a, b)))
#ifdef __clang__
#  define _alloc_(...)
#else
#  define _alloc_(...) __attribute__ ((alloc_size(__VA_ARGS__)))
#endif
#define _sentinel_ __attribute__ ((sentinel))
#define _unused_ __attribute__ ((unused))
#define _destructor_ __attribute__ ((destructor))
#define _pure_ __attribute__ ((pure))
#define _const_ __attribute__ ((const))
#define _deprecated_ __attribute__ ((deprecated))
#define _packed_ __attribute__ ((packed))
#define _malloc_ __attribute__ ((malloc))
#define _weak_ __attribute__ ((weak))
#define _likely_(x) (__builtin_expect(!!(x),1))
#define _unlikely_(x) (__builtin_expect(!!(x),0))
#define _public_ __attribute__ ((visibility("default")))
#define _hidden_ __attribute__ ((visibility("hidden")))
#define _weakref_(x) __attribute__((weakref(#x)))
#define _alignas_(x) __attribute__((aligned(__alignof(x))))
#define _cleanup_(x) __attribute__((cleanup(x)))

/* Temporarily disable some warnings */
#define DISABLE_WARNING_DECLARATION_AFTER_STATEMENT                     \
        _Pragma("GCC diagnostic push");                                 \
        _Pragma("GCC diagnostic ignored \"-Wdeclaration-after-statement\"")

#define DISABLE_WARNING_FORMAT_NONLITERAL                               \
        _Pragma("GCC diagnostic push");                                 \
        _Pragma("GCC diagnostic ignored \"-Wformat-nonliteral\"")

#define DISABLE_WARNING_MISSING_PROTOTYPES                              \
        _Pragma("GCC diagnostic push");                                 \
        _Pragma("GCC diagnostic ignored \"-Wmissing-prototypes\"")

#define DISABLE_WARNING_NONNULL                                         \
        _Pragma("GCC diagnostic push");                                 \
        _Pragma("GCC diagnostic ignored \"-Wnonnull\"")

#define DISABLE_WARNING_SHADOW                                          \
        _Pragma("GCC diagnostic push");                                 \
        _Pragma("GCC diagnostic ignored \"-Wshadow\"")

#define DISABLE_WARNING_INCOMPATIBLE_POINTER_TYPES                      \
        _Pragma("GCC diagnostic push");                                 \
        _Pragma("GCC diagnostic ignored \"-Wincompatible-pointer-types\"")

#define REENABLE_WARNING                                                \
        _Pragma("GCC diagnostic pop")

/* automake test harness */
#define EXIT_TEST_SKIP 77

#define XSTRINGIFY(x) #x
#define STRINGIFY(x) XSTRINGIFY(x)

#define XCONCATENATE(x, y) x ## y
#define CONCATENATE(x, y) XCONCATENATE(x, y)

#define UNIQ_T(x, uniq) CONCATENATE(__unique_prefix_, CONCATENATE(x, uniq))
#define UNIQ __COUNTER__

/* Rounds up */

#define ALIGN4(l) (((l) + 3) & ~3)
#define ALIGN8(l) (((l) + 7) & ~7)

#if __SIZEOF_POINTER__ == 8
#define ALIGN(l) ALIGN8(l)
#elif __SIZEOF_POINTER__ == 4
#define ALIGN(l) ALIGN4(l)
#else
#error "Wut? Pointers are neither 4 nor 8 bytes long?"
#endif

#define ALIGN_PTR(p) ((void*) ALIGN((unsigned long) (p)))
#define ALIGN4_PTR(p) ((void*) ALIGN4((unsigned long) (p)))
#define ALIGN8_PTR(p) ((void*) ALIGN8((unsigned long) (p)))

static inline size_t ALIGN_TO(size_t l, size_t ali) {
        return ((l + ali - 1) & ~(ali - 1));
}

#define ALIGN_TO_PTR(p, ali) ((void*) ALIGN_TO((unsigned long) (p), (ali)))

/* align to next higher power-of-2 (except for: 0 => 0, overflow => 0) */
static inline unsigned long ALIGN_POWER2(unsigned long u) {
        /* clz(0) is undefined */
        if (u == 1)
                return 1;

        /* left-shift overflow is undefined */
        if (__builtin_clzl(u - 1UL) < 1)
                return 0;

        return 1UL << (sizeof(u) * 8 - __builtin_clzl(u - 1UL));
}

#define ELEMENTSOF(x)                                                    \
        __extension__ (__builtin_choose_expr(                            \
                !__builtin_types_compatible_p(typeof(x), typeof(&*(x))), \
                sizeof(x)/sizeof((x)[0]),                                \
                (void)0))
/*
 * container_of - cast a member of a structure out to the containing structure
 * @ptr: the pointer to the member.
 * @type: the type of the container struct this is embedded in.
 * @member: the name of the member within the struct.
 */
#define container_of(ptr, type, member) __container_of(UNIQ, (ptr), type, member)
#define __container_of(uniq, ptr, type, member)                         \
        __extension__ ({                                                \
                const typeof( ((type*)0)->member ) *UNIQ_T(A, uniq) = (ptr); \
                (type*)( (char *)UNIQ_T(A, uniq) - offsetof(type,member) ); \
        })

#undef MAX
#define MAX(a, b) __MAX(UNIQ, (a), UNIQ, (b))
#define __MAX(aq, a, bq, b)                             \
        __extension__ ({                                \
                const typeof(a) UNIQ_T(A, aq) = (a);    \
                const typeof(b) UNIQ_T(B, bq) = (b);    \
                UNIQ_T(A,aq) > UNIQ_T(B,bq) ? UNIQ_T(A,aq) : UNIQ_T(B,bq); \
        })

/* evaluates to (void) if _A or _B are not constant or of different types */
#define CONST_MAX(_A, _B) \
        __extension__ (__builtin_choose_expr(                           \
                __builtin_constant_p(_A) &&                             \
                __builtin_constant_p(_B) &&                             \
                __builtin_types_compatible_p(typeof(_A), typeof(_B)),   \
                ((_A) > (_B)) ? (_A) : (_B),                            \
                (void)0))

/* takes two types and returns the size of the larger one */
#define MAXSIZE(A, B) (sizeof(union _packed_ { typeof(A) a; typeof(B) b; }))

#define MAX3(x,y,z)                                     \
        __extension__ ({                                \
                        const typeof(x) _c = MAX(x,y);  \
                        MAX(_c, z);                     \
                })

#undef MIN
#define MIN(a, b) __MIN(UNIQ, (a), UNIQ, (b))
#define __MIN(aq, a, bq, b)                             \
        __extension__ ({                                \
                const typeof(a) UNIQ_T(A, aq) = (a);    \
                const typeof(b) UNIQ_T(B, bq) = (b);    \
                UNIQ_T(A,aq) < UNIQ_T(B,bq) ? UNIQ_T(A,aq) : UNIQ_T(B,bq); \
        })

#define MIN3(x,y,z)                                     \
        __extension__ ({                                \
                        const typeof(x) _c = MIN(x,y);  \
                        MIN(_c, z);                     \
                })

#define LESS_BY(a, b) __LESS_BY(UNIQ, (a), UNIQ, (b))
#define __LESS_BY(aq, a, bq, b)                         \
        __extension__ ({                                \
                const typeof(a) UNIQ_T(A, aq) = (a);    \
                const typeof(b) UNIQ_T(B, bq) = (b);    \
                UNIQ_T(A,aq) > UNIQ_T(B,bq) ? UNIQ_T(A,aq) - UNIQ_T(B,bq) : 0; \
        })

#undef CLAMP
#define CLAMP(x, low, high) __CLAMP(UNIQ, (x), UNIQ, (low), UNIQ, (high))
#define __CLAMP(xq, x, lowq, low, highq, high)                          \
        __extension__ ({                                                \
                const typeof(x) UNIQ_T(X,xq) = (x);                     \
                const typeof(low) UNIQ_T(LOW,lowq) = (low);             \
                const typeof(high) UNIQ_T(HIGH,highq) = (high);         \
                        UNIQ_T(X,xq) > UNIQ_T(HIGH,highq) ?             \
                                UNIQ_T(HIGH,highq) :                    \
                                UNIQ_T(X,xq) < UNIQ_T(LOW,lowq) ?       \
                                        UNIQ_T(LOW,lowq) :              \
                                        UNIQ_T(X,xq);                   \
        })

/* [(x + y - 1) / y] suffers from an integer overflow, even though the
 * computation should be possible in the given type. Therefore, we use
 * [x / y + !!(x % y)]. Note that on "Real CPUs" a division returns both the
 * quotient and the remainder, so both should be equally fast. */
#define DIV_ROUND_UP(_x, _y)                                            \
        __extension__ ({                                                \
                const typeof(_x) __x = (_x);                            \
                const typeof(_y) __y = (_y);                            \
                (__x / __y + !!(__x % __y));                            \
        })

#define assert_message_se(expr, message)                                \
        do {                                                            \
                if (_unlikely_(!(expr)))                                \
                        log_assert_failed(message, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
        } while (false)

#define assert_se(expr) assert_message_se(expr, #expr)

/* We override the glibc assert() here. */
#undef assert
#ifdef NDEBUG
#define assert(expr) do {} while (false)
#else
#define assert(expr) assert_message_se(expr, #expr)
#endif

#define assert_not_reached(t)                                           \
        do {                                                            \
                log_assert_failed_unreachable(t, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
        } while (false)

#if defined(static_assert)
/* static_assert() is sometimes defined in a way that trips up
 * -Wdeclaration-after-statement, hence let's temporarily turn off
 * this warning around it. */
#define assert_cc(expr)                                                 \
        DISABLE_WARNING_DECLARATION_AFTER_STATEMENT;                    \
        static_assert(expr, #expr);                                     \
        REENABLE_WARNING
#else
#define assert_cc(expr)                                                 \
        DISABLE_WARNING_DECLARATION_AFTER_STATEMENT;                    \
        struct CONCATENATE(_assert_struct_, __COUNTER__) {              \
                char x[(expr) ? 0 : -1];                                \
        };                                                              \
        REENABLE_WARNING
#endif

#define assert_log(expr, message) ((_likely_(expr))                     \
        ? (true)                                                        \
        : (log_assert_failed_return(message, __FILE__, __LINE__, __PRETTY_FUNCTION__), false))

#define assert_return(expr, r)                                          \
        do {                                                            \
                if (!assert_log(expr, #expr))                           \
                        return (r);                                     \
        } while (false)

#define assert_return_errno(expr, r, err)                               \
        do {                                                            \
                if (!assert_log(expr, #expr)) {                         \
                        errno = err;                                    \
                        return (r);                                     \
                }                                                       \
        } while (false)

#define PTR_TO_INT(p) ((int) ((intptr_t) (p)))
#define INT_TO_PTR(u) ((void *) ((intptr_t) (u)))
#define PTR_TO_UINT(p) ((unsigned int) ((uintptr_t) (p)))
#define UINT_TO_PTR(u) ((void *) ((uintptr_t) (u)))

#define PTR_TO_LONG(p) ((long) ((intptr_t) (p)))
#define LONG_TO_PTR(u) ((void *) ((intptr_t) (u)))
#define PTR_TO_ULONG(p) ((unsigned long) ((uintptr_t) (p)))
#define ULONG_TO_PTR(u) ((void *) ((uintptr_t) (u)))

#define PTR_TO_INT32(p) ((int32_t) ((intptr_t) (p)))
#define INT32_TO_PTR(u) ((void *) ((intptr_t) (u)))
#define PTR_TO_UINT32(p) ((uint32_t) ((uintptr_t) (p)))
#define UINT32_TO_PTR(u) ((void *) ((uintptr_t) (u)))

#define PTR_TO_INT64(p) ((int64_t) ((intptr_t) (p)))
#define INT64_TO_PTR(u) ((void *) ((intptr_t) (u)))
#define PTR_TO_UINT64(p) ((uint64_t) ((uintptr_t) (p)))
#define UINT64_TO_PTR(u) ((void *) ((uintptr_t) (u)))

#define PTR_TO_SIZE(p) ((size_t) ((uintptr_t) (p)))
#define SIZE_TO_PTR(u) ((void *) ((uintptr_t) (u)))

#define CHAR_TO_STR(x) ((char[2]) { x, 0 })

#define char_array_0(x) x[sizeof(x)-1] = 0;

/* Returns the number of chars needed to format variables of the
 * specified type as a decimal string. Adds in extra space for a
 * negative '-' prefix (hence works correctly on signed
 * types). Includes space for the trailing NUL. */
#define DECIMAL_STR_MAX(type)                                           \
        (2+(sizeof(type) <= 1 ? 3 :                                     \
            sizeof(type) <= 2 ? 5 :                                     \
            sizeof(type) <= 4 ? 10 :                                    \
            sizeof(type) <= 8 ? 20 : sizeof(int[-2*(sizeof(type) > 8)])))

#define DECIMAL_STR_WIDTH(x)                            \
        ({                                              \
                typeof(x) _x_ = (x);                    \
                unsigned ans = 1;                       \
                while (_x_ /= 10)                       \
                        ans++;                          \
                ans;                                    \
        })

#define SET_FLAG(v, flag, b) \
        (v) = (b) ? ((v) | (flag)) : ((v) & ~(flag))

#define CASE_F(X) case X:
#define CASE_F_1(CASE, X) CASE_F(X)
#define CASE_F_2(CASE, X, ...)  CASE(X) CASE_F_1(CASE, __VA_ARGS__)
#define CASE_F_3(CASE, X, ...)  CASE(X) CASE_F_2(CASE, __VA_ARGS__)
#define CASE_F_4(CASE, X, ...)  CASE(X) CASE_F_3(CASE, __VA_ARGS__)
#define CASE_F_5(CASE, X, ...)  CASE(X) CASE_F_4(CASE, __VA_ARGS__)
#define CASE_F_6(CASE, X, ...)  CASE(X) CASE_F_5(CASE, __VA_ARGS__)
#define CASE_F_7(CASE, X, ...)  CASE(X) CASE_F_6(CASE, __VA_ARGS__)
#define CASE_F_8(CASE, X, ...)  CASE(X) CASE_F_7(CASE, __VA_ARGS__)
#define CASE_F_9(CASE, X, ...)  CASE(X) CASE_F_8(CASE, __VA_ARGS__)
#define CASE_F_10(CASE, X, ...) CASE(X) CASE_F_9(CASE, __VA_ARGS__)
#define CASE_F_11(CASE, X, ...) CASE(X) CASE_F_10(CASE, __VA_ARGS__)
#define CASE_F_12(CASE, X, ...) CASE(X) CASE_F_11(CASE, __VA_ARGS__)
#define CASE_F_13(CASE, X, ...) CASE(X) CASE_F_12(CASE, __VA_ARGS__)
#define CASE_F_14(CASE, X, ...) CASE(X) CASE_F_13(CASE, __VA_ARGS__)
#define CASE_F_15(CASE, X, ...) CASE(X) CASE_F_14(CASE, __VA_ARGS__)
#define CASE_F_16(CASE, X, ...) CASE(X) CASE_F_15(CASE, __VA_ARGS__)
#define CASE_F_17(CASE, X, ...) CASE(X) CASE_F_16(CASE, __VA_ARGS__)
#define CASE_F_18(CASE, X, ...) CASE(X) CASE_F_17(CASE, __VA_ARGS__)
#define CASE_F_19(CASE, X, ...) CASE(X) CASE_F_18(CASE, __VA_ARGS__)
#define CASE_F_20(CASE, X, ...) CASE(X) CASE_F_19(CASE, __VA_ARGS__)

#define GET_CASE_F(_1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11,_12,_13,_14,_15,_16,_17,_18,_19,_20,NAME,...) NAME
#define FOR_EACH_MAKE_CASE(...) \
        GET_CASE_F(__VA_ARGS__,CASE_F_20,CASE_F_19,CASE_F_18,CASE_F_17,CASE_F_16,CASE_F_15,CASE_F_14,CASE_F_13,CASE_F_12,CASE_F_11, \
                               CASE_F_10,CASE_F_9,CASE_F_8,CASE_F_7,CASE_F_6,CASE_F_5,CASE_F_4,CASE_F_3,CASE_F_2,CASE_F_1) \
                   (CASE_F,__VA_ARGS__)

#define IN_SET(x, ...)                          \
        ({                                      \
                bool _found = false;            \
                /* If the build breaks in the line below, you need to extend the case macros */ \
                static _unused_ char _static_assert__macros_need_to_be_extended[20 - sizeof((int[]){__VA_ARGS__})/sizeof(int)]; \
                switch(x) {                     \
                FOR_EACH_MAKE_CASE(__VA_ARGS__) \
                        _found = true;          \
                        break;                  \
                default:                        \
                        break;                  \
                }                               \
                _found;                         \
        })

#define SWAP_TWO(x, y) do {                        \
                typeof(x) _t = (x);                \
                (x) = (y);                         \
                (y) = (_t);                        \
        } while (false)

/* Define C11 thread_local attribute even on older gcc compiler
 * version */
#ifndef thread_local
/*
 * Don't break on glibc < 2.16 that doesn't define __STDC_NO_THREADS__
 * see http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53769
 */
#if __STDC_VERSION__ >= 201112L && !(defined(__STDC_NO_THREADS__) || (defined(__GNU_LIBRARY__) && __GLIBC__ == 2 && __GLIBC_MINOR__ < 16))
#define thread_local _Thread_local
#else
#define thread_local __thread
#endif
#endif

/* Define C11 noreturn without <stdnoreturn.h> and even on older gcc
 * compiler versions */
#ifndef noreturn
#if __STDC_VERSION__ >= 201112L
#define noreturn _Noreturn
#else
#define noreturn __attribute__((noreturn))
#endif
#endif

#define DEFINE_TRIVIAL_CLEANUP_FUNC(type, func)                 \
        static inline void func##p(type *p) {                   \
                if (*p)                                         \
                        func(*p);                               \
        }                                                       \
        struct __useless_struct_to_allow_trailing_semicolon__

#include "log.h"
Commit	Line	Data
c2f1db8f	1	#pragma once
60918275	2
a7334b09 LP	3	/***
	4	This file is part of systemd.
	5
	6	Copyright 2010 Lennart Poettering
	7
	8	systemd is free software; you can redistribute it and/or modify it
5430f7f2 LP	9	under the terms of the GNU Lesser General Public License as published by
5430f7f2 LP	10	the Free Software Foundation; either version 2.1 of the License, or
a7334b09 LP	11	(at your option) any later version.
	12
	13	systemd is distributed in the hope that it will be useful, but
	14	WITHOUT ANY WARRANTY; without even the implied warranty of
	15	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
5430f7f2	16	Lesser General Public License for more details.
a7334b09	17
5430f7f2	18	You should have received a copy of the GNU Lesser General Public License
a7334b09 LP	19	along with systemd; If not, see <http://www.gnu.org/licenses/>.
	20	***/
	21
60918275	22	#include <assert.h>
c31e1495	23	#include <inttypes.h>
c01ff965	24	#include <stdbool.h>
afc5dbf3	25	#include <sys/param.h>
27d13af7	26	#include <sys/sysmacros.h>
afc5dbf3	27	#include <sys/types.h>
60918275	28
44b601bc	29	#define _printf_(a,b) __attribute__ ((format (printf, a, b)))
26e9e10b ZJS	30	#ifdef __clang__
	31	# define _alloc_(...)
	32	#else
	33	# define _alloc_(...) __attribute__ ((alloc_size(__VA_ARGS__)))
	34	#endif
93a46b0b	35	#define _sentinel_ __attribute__ ((sentinel))
93a46b0b LP	36	#define _unused_ __attribute__ ((unused))
	37	#define _destructor_ __attribute__ ((destructor))
	38	#define _pure_ __attribute__ ((pure))
	39	#define _const_ __attribute__ ((const))
	40	#define _deprecated_ __attribute__ ((deprecated))
	41	#define _packed_ __attribute__ ((packed))
	42	#define _malloc_ __attribute__ ((malloc))
	43	#define _weak_ __attribute__ ((weak))
	44	#define _likely_(x) (__builtin_expect(!!(x),1))
	45	#define _unlikely_(x) (__builtin_expect(!!(x),0))
40473a70 LP	46	#define _public_ __attribute__ ((visibility("default")))
40473a70 LP	47	#define _hidden_ __attribute__ ((visibility("hidden")))
ad780f19	48	#define _weakref_(x) __attribute__((weakref(#x)))
19d1e4ee	49	#define _alignas_(x) __attribute__((aligned(__alignof(x))))
dfb33a97	50	#define _cleanup_(x) __attribute__((cleanup(x)))
60918275	51
7ebe131a LP	52	/* Temporarily disable some warnings */
	53	#define DISABLE_WARNING_DECLARATION_AFTER_STATEMENT \
	54	_Pragma("GCC diagnostic push"); \
	55	_Pragma("GCC diagnostic ignored \"-Wdeclaration-after-statement\"")
	56
bcfce235 LP	57	#define DISABLE_WARNING_FORMAT_NONLITERAL \
	58	_Pragma("GCC diagnostic push"); \
	59	_Pragma("GCC diagnostic ignored \"-Wformat-nonliteral\"")
	60
f0f2e63b LP	61	#define DISABLE_WARNING_MISSING_PROTOTYPES \
	62	_Pragma("GCC diagnostic push"); \
	63	_Pragma("GCC diagnostic ignored \"-Wmissing-prototypes\"")
	64
8fca4e30 LP	65	#define DISABLE_WARNING_NONNULL \
	66	_Pragma("GCC diagnostic push"); \
	67	_Pragma("GCC diagnostic ignored \"-Wnonnull\"")
	68
d442e2ec DH	69	#define DISABLE_WARNING_SHADOW \
	70	_Pragma("GCC diagnostic push"); \
	71	_Pragma("GCC diagnostic ignored \"-Wshadow\"")
	72
df99a9ef ZJS	73	#define DISABLE_WARNING_INCOMPATIBLE_POINTER_TYPES \
	74	_Pragma("GCC diagnostic push"); \
	75	_Pragma("GCC diagnostic ignored \"-Wincompatible-pointer-types\"")
	76
7ebe131a LP	77	#define REENABLE_WARNING \
	78	_Pragma("GCC diagnostic pop")
	79
49e5de64 ZJS	80	/* automake test harness */
	81	#define EXIT_TEST_SKIP 77
	82
bef2733f LP	83	#define XSTRINGIFY(x) #x
	84	#define STRINGIFY(x) XSTRINGIFY(x)
	85
ab9cbe34 LS	86	#define XCONCATENATE(x, y) x ## y
	87	#define CONCATENATE(x, y) XCONCATENATE(x, y)
	88
fb835651 DH	89	#define UNIQ_T(x, uniq) CONCATENATE(__unique_prefix_, CONCATENATE(x, uniq))
	90	#define UNIQ __COUNTER__
	91
60918275	92	/* Rounds up */
9be9c7cf LP	93
	94	#define ALIGN4(l) (((l) + 3) & ~3)
	95	#define ALIGN8(l) (((l) + 7) & ~7)
	96
	97	#if __SIZEOF_POINTER__ == 8
	98	#define ALIGN(l) ALIGN8(l)
	99	#elif __SIZEOF_POINTER__ == 4
	100	#define ALIGN(l) ALIGN4(l)
	101	#else
	102	#error "Wut? Pointers are neither 4 nor 8 bytes long?"
	103	#endif
	104
5f86c1f4 LP	105	#define ALIGN_PTR(p) ((void*) ALIGN((unsigned long) (p)))
	106	#define ALIGN4_PTR(p) ((void*) ALIGN4((unsigned long) (p)))
	107	#define ALIGN8_PTR(p) ((void*) ALIGN8((unsigned long) (p)))
e86b80b8	108
37f85e66	109	static inline size_t ALIGN_TO(size_t l, size_t ali) {
37f85e66	110	return ((l + ali - 1) & ~(ali - 1));
22be093f LP	111	}
22be093f LP	112
5f86c1f4	113	#define ALIGN_TO_PTR(p, ali) ((void*) ALIGN_TO((unsigned long) (p), (ali)))
49aa47c7	114
625e870b DH	115	/* align to next higher power-of-2 (except for: 0 => 0, overflow => 0) */
	116	static inline unsigned long ALIGN_POWER2(unsigned long u) {
	117	/* clz(0) is undefined */
	118	if (u == 1)
	119	return 1;
	120
	121	/* left-shift overflow is undefined */
	122	if (__builtin_clzl(u - 1UL) < 1)
	123	return 0;
	124
	125	return 1UL << (sizeof(u) * 8 - __builtin_clzl(u - 1UL));
	126	}
	127
7f39a210 MS	128	#define ELEMENTSOF(x) \
	129	__extension__ (__builtin_choose_expr( \
	130	!__builtin_types_compatible_p(typeof(x), typeof(&*(x))), \
	131	sizeof(x)/sizeof((x)[0]), \
	132	(void)0))
bbc98d32 KS	133	/*
	134	* container_of - cast a member of a structure out to the containing structure
	135	* @ptr: the pointer to the member.
	136	* @type: the type of the container struct this is embedded in.
	137	* @member: the name of the member within the struct.
bbc98d32	138	*/
fb835651 DH	139	#define container_of(ptr, type, member) __container_of(UNIQ, (ptr), type, member)
fb835651 DH	140	#define __container_of(uniq, ptr, type, member) \
fa70beaa	141	__extension__ ({ \
fb835651 DH	142	const typeof( ((type)0)->member ) UNIQ_T(A, uniq) = (ptr); \
	143	(type)( (char )UNIQ_T(A, uniq) - offsetof(type,member) ); \
	144	})
bbc98d32	145
9607d947	146	#undef MAX
667a0377 DH	147	#define MAX(a, b) __MAX(UNIQ, (a), UNIQ, (b))
667a0377 DH	148	#define __MAX(aq, a, bq, b) \
fdcba430	149	__extension__ ({ \
667a0377 DH	150	const typeof(a) UNIQ_T(A, aq) = (a); \
	151	const typeof(b) UNIQ_T(B, bq) = (b); \
	152	UNIQ_T(A,aq) > UNIQ_T(B,bq) ? UNIQ_T(A,aq) : UNIQ_T(B,bq); \
	153	})
60918275	154
7242d742 DH	155	/* evaluates to (void) if _A or _B are not constant or of different types */
	156	#define CONST_MAX(_A, _B) \
	157	__extension__ (__builtin_choose_expr( \
	158	__builtin_constant_p(_A) && \
	159	__builtin_constant_p(_B) && \
	160	__builtin_types_compatible_p(typeof(_A), typeof(_B)), \
	161	((_A) > (_B)) ? (_A) : (_B), \
	162	(void)0))
	163
40a1eebd DH	164	/* takes two types and returns the size of the larger one */
	165	#define MAXSIZE(A, B) (sizeof(union _packed_ { typeof(A) a; typeof(B) b; }))
	166
fdcba430 DH	167	#define MAX3(x,y,z) \
	168	__extension__ ({ \
	169	const typeof(x) _c = MAX(x,y); \
	170	MAX(_c, z); \
9607d947	171	})
3b63d2d3	172
9607d947	173	#undef MIN
667a0377 DH	174	#define MIN(a, b) __MIN(UNIQ, (a), UNIQ, (b))
667a0377 DH	175	#define __MIN(aq, a, bq, b) \
fdcba430	176	__extension__ ({ \
667a0377 DH	177	const typeof(a) UNIQ_T(A, aq) = (a); \
	178	const typeof(b) UNIQ_T(B, bq) = (b); \
	179	UNIQ_T(A,aq) < UNIQ_T(B,bq) ? UNIQ_T(A,aq) : UNIQ_T(B,bq); \
	180	})
60918275	181
fdcba430 DH	182	#define MIN3(x,y,z) \
	183	__extension__ ({ \
	184	const typeof(x) _c = MIN(x,y); \
	185	MIN(_c, z); \
7df23077 DH	186	})
7df23077 DH	187
667a0377 DH	188	#define LESS_BY(a, b) __LESS_BY(UNIQ, (a), UNIQ, (b))
667a0377 DH	189	#define __LESS_BY(aq, a, bq, b) \
fdcba430	190	__extension__ ({ \
667a0377 DH	191	const typeof(a) UNIQ_T(A, aq) = (a); \
	192	const typeof(b) UNIQ_T(B, bq) = (b); \
	193	UNIQ_T(A,aq) > UNIQ_T(B,bq) ? UNIQ_T(A,aq) - UNIQ_T(B,bq) : 0; \
	194	})
348ced90	195
667a0377 DH	196	#undef CLAMP
	197	#define CLAMP(x, low, high) __CLAMP(UNIQ, (x), UNIQ, (low), UNIQ, (high))
	198	#define __CLAMP(xq, x, lowq, low, highq, high) \
60918275	199	__extension__ ({ \
667a0377 DH	200	const typeof(x) UNIQ_T(X,xq) = (x); \
	201	const typeof(low) UNIQ_T(LOW,lowq) = (low); \
	202	const typeof(high) UNIQ_T(HIGH,highq) = (high); \
	203	UNIQ_T(X,xq) > UNIQ_T(HIGH,highq) ? \
	204	UNIQ_T(HIGH,highq) : \
	205	UNIQ_T(X,xq) < UNIQ_T(LOW,lowq) ? \
	206	UNIQ_T(LOW,lowq) : \
	207	UNIQ_T(X,xq); \
	208	})
60918275	209
180a60bc DH	210	/* [(x + y - 1) / y] suffers from an integer overflow, even though the
	211	* computation should be possible in the given type. Therefore, we use
	212	* [x / y + !!(x % y)]. Note that on "Real CPUs" a division returns both the
	213	* quotient and the remainder, so both should be equally fast. */
	214	#define DIV_ROUND_UP(_x, _y) \
	215	__extension__ ({ \
	216	const typeof(_x) __x = (_x); \
	217	const typeof(_y) __y = (_y); \
	218	(__x / __y + !!(__x % __y)); \
	219	})
	220
34c38d2a	221	#define assert_message_se(expr, message) \
dd8f71ee	222	do { \
93a46b0b	223	if (_unlikely_(!(expr))) \
34c38d2a MS	224	log_assert_failed(message, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
	225	} while (false)
	226
	227	#define assert_se(expr) assert_message_se(expr, #expr)
dd8f71ee LP	228
	229	/* We override the glibc assert() here. */
	230	#undef assert
	231	#ifdef NDEBUG
9ed794a3	232	#define assert(expr) do {} while (false)
dd8f71ee	233	#else
34c38d2a	234	#define assert(expr) assert_message_se(expr, #expr)
dd8f71ee	235	#endif
60918275	236
dd8f71ee LP	237	#define assert_not_reached(t) \
dd8f71ee LP	238	do { \
b7f33638	239	log_assert_failed_unreachable(t, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
dd8f71ee	240	} while (false)
60918275	241
f791c684	242	#if defined(static_assert)
7ebe131a LP	243	/* static_assert() is sometimes defined in a way that trips up
	244	* -Wdeclaration-after-statement, hence let's temporarily turn off
	245	* this warning around it. */
	246	#define assert_cc(expr) \
	247	DISABLE_WARNING_DECLARATION_AFTER_STATEMENT; \
	248	static_assert(expr, #expr); \
	249	REENABLE_WARNING
f791c684	250	#else
7ebe131a LP	251	#define assert_cc(expr) \
7ebe131a LP	252	DISABLE_WARNING_DECLARATION_AFTER_STATEMENT; \
6825a04d	253	struct CONCATENATE(_assert_struct_, __COUNTER__) { \
7ebe131a LP	254	char x[(expr) ? 0 : -1]; \
	255	}; \
	256	REENABLE_WARNING
f791c684	257	#endif
60918275	258
34c38d2a MS	259	#define assert_log(expr, message) ((_likely_(expr)) \
	260	? (true) \
	261	: (log_assert_failed_return(message, __FILE__, __LINE__, __PRETTY_FUNCTION__), false))
366e6411	262
80514f9c LP	263	#define assert_return(expr, r) \
80514f9c LP	264	do { \
34c38d2a	265	if (!assert_log(expr, #expr)) \
80514f9c	266	return (r); \
18387b59 LP	267	} while (false)
18387b59 LP	268
aa029628 TG	269	#define assert_return_errno(expr, r, err) \
aa029628 TG	270	do { \
34c38d2a	271	if (!assert_log(expr, #expr)) { \
aa029628 TG	272	errno = err; \
	273	return (r); \
	274	} \
	275	} while (false)
	276
a3dc3547 KS	277	#define PTR_TO_INT(p) ((int) ((intptr_t) (p)))
a3dc3547 KS	278	#define INT_TO_PTR(u) ((void *) ((intptr_t) (u)))
60918275	279	#define PTR_TO_UINT(p) ((unsigned int) ((uintptr_t) (p)))
a3dc3547	280	#define UINT_TO_PTR(u) ((void *) ((uintptr_t) (u)))
60918275	281
a3dc3547 KS	282	#define PTR_TO_LONG(p) ((long) ((intptr_t) (p)))
a3dc3547 KS	283	#define LONG_TO_PTR(u) ((void *) ((intptr_t) (u)))
c6c18be3	284	#define PTR_TO_ULONG(p) ((unsigned long) ((uintptr_t) (p)))
a3dc3547	285	#define ULONG_TO_PTR(u) ((void *) ((uintptr_t) (u)))
c6c18be3	286
a3dc3547 KS	287	#define PTR_TO_INT32(p) ((int32_t) ((intptr_t) (p)))
	288	#define INT32_TO_PTR(u) ((void *) ((intptr_t) (u)))
	289	#define PTR_TO_UINT32(p) ((uint32_t) ((uintptr_t) (p)))
	290	#define UINT32_TO_PTR(u) ((void *) ((uintptr_t) (u)))
60918275	291
a3dc3547 KS	292	#define PTR_TO_INT64(p) ((int64_t) ((intptr_t) (p)))
	293	#define INT64_TO_PTR(u) ((void *) ((intptr_t) (u)))
	294	#define PTR_TO_UINT64(p) ((uint64_t) ((uintptr_t) (p)))
	295	#define UINT64_TO_PTR(u) ((void *) ((uintptr_t) (u)))
c6c18be3	296
74b2466e LP	297	#define PTR_TO_SIZE(p) ((size_t) ((uintptr_t) (p)))
	298	#define SIZE_TO_PTR(u) ((void *) ((uintptr_t) (u)))
	299
a9c55a88 LP	300	#define CHAR_TO_STR(x) ((char[2]) { x, 0 })
a9c55a88 LP	301
034c6ed7 LP	302	#define char_array_0(x) x[sizeof(x)-1] = 0;
034c6ed7 LP	303
fa70beaa LP	304	/* Returns the number of chars needed to format variables of the
fa70beaa LP	305	* specified type as a decimal string. Adds in extra space for a
b7ce6b59 LP	306	* negative '-' prefix (hence works correctly on signed
b7ce6b59 LP	307	* types). Includes space for the trailing NUL. */
fa70beaa	308	#define DECIMAL_STR_MAX(type) \
5bcb0f2b	309	(2+(sizeof(type) <= 1 ? 3 : \
fa70beaa LP	310	sizeof(type) <= 2 ? 5 : \
	311	sizeof(type) <= 4 ? 10 : \
	312	sizeof(type) <= 8 ? 20 : sizeof(int[-2*(sizeof(type) > 8)])))
	313
0d1dbeb3 LP	314	#define DECIMAL_STR_WIDTH(x) \
	315	({ \
	316	typeof(x) _x_ = (x); \
	317	unsigned ans = 1; \
	318	while (_x_ /= 10) \
	319	ans++; \
	320	ans; \
	321	})
	322
264ad849 LP	323	#define SET_FLAG(v, flag, b) \
	324	(v) = (b) ? ((v) \| (flag)) : ((v) & ~(flag))
	325
d5b26d50 DM	326	#define CASE_F(X) case X:
	327	#define CASE_F_1(CASE, X) CASE_F(X)
	328	#define CASE_F_2(CASE, X, ...) CASE(X) CASE_F_1(CASE, __VA_ARGS__)
	329	#define CASE_F_3(CASE, X, ...) CASE(X) CASE_F_2(CASE, __VA_ARGS__)
	330	#define CASE_F_4(CASE, X, ...) CASE(X) CASE_F_3(CASE, __VA_ARGS__)
	331	#define CASE_F_5(CASE, X, ...) CASE(X) CASE_F_4(CASE, __VA_ARGS__)
	332	#define CASE_F_6(CASE, X, ...) CASE(X) CASE_F_5(CASE, __VA_ARGS__)
	333	#define CASE_F_7(CASE, X, ...) CASE(X) CASE_F_6(CASE, __VA_ARGS__)
	334	#define CASE_F_8(CASE, X, ...) CASE(X) CASE_F_7(CASE, __VA_ARGS__)
	335	#define CASE_F_9(CASE, X, ...) CASE(X) CASE_F_8(CASE, __VA_ARGS__)
	336	#define CASE_F_10(CASE, X, ...) CASE(X) CASE_F_9(CASE, __VA_ARGS__)
	337	#define CASE_F_11(CASE, X, ...) CASE(X) CASE_F_10(CASE, __VA_ARGS__)
	338	#define CASE_F_12(CASE, X, ...) CASE(X) CASE_F_11(CASE, __VA_ARGS__)
	339	#define CASE_F_13(CASE, X, ...) CASE(X) CASE_F_12(CASE, __VA_ARGS__)
	340	#define CASE_F_14(CASE, X, ...) CASE(X) CASE_F_13(CASE, __VA_ARGS__)
	341	#define CASE_F_15(CASE, X, ...) CASE(X) CASE_F_14(CASE, __VA_ARGS__)
	342	#define CASE_F_16(CASE, X, ...) CASE(X) CASE_F_15(CASE, __VA_ARGS__)
	343	#define CASE_F_17(CASE, X, ...) CASE(X) CASE_F_16(CASE, __VA_ARGS__)
	344	#define CASE_F_18(CASE, X, ...) CASE(X) CASE_F_17(CASE, __VA_ARGS__)
	345	#define CASE_F_19(CASE, X, ...) CASE(X) CASE_F_18(CASE, __VA_ARGS__)
	346	#define CASE_F_20(CASE, X, ...) CASE(X) CASE_F_19(CASE, __VA_ARGS__)
	347
	348	#define GET_CASE_F(_1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11,_12,_13,_14,_15,_16,_17,_18,_19,_20,NAME,...) NAME
	349	#define FOR_EACH_MAKE_CASE(...) \
	350	GET_CASE_F(__VA_ARGS__,CASE_F_20,CASE_F_19,CASE_F_18,CASE_F_17,CASE_F_16,CASE_F_15,CASE_F_14,CASE_F_13,CASE_F_12,CASE_F_11, \
	351	CASE_F_10,CASE_F_9,CASE_F_8,CASE_F_7,CASE_F_6,CASE_F_5,CASE_F_4,CASE_F_3,CASE_F_2,CASE_F_1) \
	352	(CASE_F,__VA_ARGS__)
	353
	354	#define IN_SET(x, ...) \
	355	({ \
	356	bool _found = false; \
	357	/* If the build breaks in the line below, you need to extend the case macros */ \
	358	static _unused_ char _static_assert__macros_need_to_be_extended[20 - sizeof((int[]){__VA_ARGS__})/sizeof(int)]; \
	359	switch(x) { \
	360	FOR_EACH_MAKE_CASE(__VA_ARGS__) \
	361	_found = true; \
	362	break; \
	363	default: \
	364	break; \
	365	} \
	366	_found; \
cabb7806 LP	367	})
cabb7806 LP	368
35aa04e9 LP	369	#define SWAP_TWO(x, y) do { \
	370	typeof(x) _t = (x); \
	371	(x) = (y); \
	372	(y) = (_t); \
	373	} while (false)
	374
919ce0b7 SL	375	/* Define C11 thread_local attribute even on older gcc compiler
919ce0b7 SL	376	* version */
ec202eae SL	377	#ifndef thread_local
	378	/*
	379	* Don't break on glibc < 2.16 that doesn't define __STDC_NO_THREADS__
	380	* see http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53769
	381	*/
	382	#if __STDC_VERSION__ >= 201112L && !(defined(__STDC_NO_THREADS__) \|\| (defined(__GNU_LIBRARY__) && __GLIBC__ == 2 && __GLIBC_MINOR__ < 16))
	383	#define thread_local _Thread_local
	384	#else
	385	#define thread_local __thread
	386	#endif
	387	#endif
cabb7806	388
919ce0b7 SL	389	/* Define C11 noreturn without <stdnoreturn.h> and even on older gcc
	390	* compiler versions */
	391	#ifndef noreturn
	392	#if __STDC_VERSION__ >= 201112L
	393	#define noreturn _Noreturn
	394	#else
	395	#define noreturn __attribute__((noreturn))
	396	#endif
	397	#endif
	398
a2341f68 ZJS	399	#define DEFINE_TRIVIAL_CLEANUP_FUNC(type, func) \
	400	static inline void func##p(type *p) { \
	401	if (*p) \
	402	func(*p); \
	403	} \
	404	struct __useless_struct_to_allow_trailing_semicolon__
	405
dd8f71ee	406	#include "log.h"