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

/* SPDX-License-Identifier: LGPL-2.1+ */
#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 <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)))
#define _fallthrough_ __attribute__((fallthrough))

/* 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__

/* builtins */
#if __SIZEOF_INT__ == 4
#define BUILTIN_FFS_U32(x) __builtin_ffs(x);
#elif __SIZEOF_LONG__ == 4
#define BUILTIN_FFS_U32(x) __builtin_ffsl(x);
#else
#error "neither int nor long are four bytes long?!?"
#endif

/* 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
53e1b683	1	/* SPDX-License-Identifier: LGPL-2.1+ */
c2f1db8f	2	#pragma once
60918275	3
a7334b09 LP	4	/***
	5	This file is part of systemd.
	6
	7	Copyright 2010 Lennart Poettering
	8
	9	systemd is free software; you can redistribute it and/or modify it
5430f7f2 LP	10	under the terms of the GNU Lesser General Public License as published by
5430f7f2 LP	11	the Free Software Foundation; either version 2.1 of the License, or
a7334b09 LP	12	(at your option) any later version.
	13
	14	systemd is distributed in the hope that it will be useful, but
	15	WITHOUT ANY WARRANTY; without even the implied warranty of
	16	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
5430f7f2	17	Lesser General Public License for more details.
a7334b09	18
5430f7f2	19	You should have received a copy of the GNU Lesser General Public License
a7334b09 LP	20	along with systemd; If not, see <http://www.gnu.org/licenses/>.
	21	***/
	22
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)))
4831981d	51	#define _fallthrough_ __attribute__((fallthrough))
60918275	52
7ebe131a LP	53	/* Temporarily disable some warnings */
	54	#define DISABLE_WARNING_DECLARATION_AFTER_STATEMENT \
	55	_Pragma("GCC diagnostic push"); \
	56	_Pragma("GCC diagnostic ignored \"-Wdeclaration-after-statement\"")
	57
bcfce235 LP	58	#define DISABLE_WARNING_FORMAT_NONLITERAL \
	59	_Pragma("GCC diagnostic push"); \
	60	_Pragma("GCC diagnostic ignored \"-Wformat-nonliteral\"")
	61
f0f2e63b LP	62	#define DISABLE_WARNING_MISSING_PROTOTYPES \
	63	_Pragma("GCC diagnostic push"); \
	64	_Pragma("GCC diagnostic ignored \"-Wmissing-prototypes\"")
	65
8fca4e30 LP	66	#define DISABLE_WARNING_NONNULL \
	67	_Pragma("GCC diagnostic push"); \
	68	_Pragma("GCC diagnostic ignored \"-Wnonnull\"")
	69
d442e2ec DH	70	#define DISABLE_WARNING_SHADOW \
	71	_Pragma("GCC diagnostic push"); \
	72	_Pragma("GCC diagnostic ignored \"-Wshadow\"")
	73
df99a9ef ZJS	74	#define DISABLE_WARNING_INCOMPATIBLE_POINTER_TYPES \
	75	_Pragma("GCC diagnostic push"); \
	76	_Pragma("GCC diagnostic ignored \"-Wincompatible-pointer-types\"")
	77
7ebe131a LP	78	#define REENABLE_WARNING \
	79	_Pragma("GCC diagnostic pop")
	80
49e5de64 ZJS	81	/* automake test harness */
	82	#define EXIT_TEST_SKIP 77
	83
bef2733f LP	84	#define XSTRINGIFY(x) #x
	85	#define STRINGIFY(x) XSTRINGIFY(x)
	86
ab9cbe34 LS	87	#define XCONCATENATE(x, y) x ## y
	88	#define CONCATENATE(x, y) XCONCATENATE(x, y)
	89
fb835651 DH	90	#define UNIQ_T(x, uniq) CONCATENATE(__unique_prefix_, CONCATENATE(x, uniq))
	91	#define UNIQ __COUNTER__
	92
13b498f9 TJ	93	/* builtins */
	94	#if __SIZEOF_INT__ == 4
	95	#define BUILTIN_FFS_U32(x) __builtin_ffs(x);
	96	#elif __SIZEOF_LONG__ == 4
	97	#define BUILTIN_FFS_U32(x) __builtin_ffsl(x);
	98	#else
	99	#error "neither int nor long are four bytes long?!?"
	100	#endif
	101
60918275	102	/* Rounds up */
9be9c7cf LP	103
	104	#define ALIGN4(l) (((l) + 3) & ~3)
	105	#define ALIGN8(l) (((l) + 7) & ~7)
	106
	107	#if __SIZEOF_POINTER__ == 8
	108	#define ALIGN(l) ALIGN8(l)
	109	#elif __SIZEOF_POINTER__ == 4
	110	#define ALIGN(l) ALIGN4(l)
	111	#else
	112	#error "Wut? Pointers are neither 4 nor 8 bytes long?"
	113	#endif
	114
5f86c1f4 LP	115	#define ALIGN_PTR(p) ((void*) ALIGN((unsigned long) (p)))
	116	#define ALIGN4_PTR(p) ((void*) ALIGN4((unsigned long) (p)))
	117	#define ALIGN8_PTR(p) ((void*) ALIGN8((unsigned long) (p)))
e86b80b8	118
37f85e66	119	static inline size_t ALIGN_TO(size_t l, size_t ali) {
37f85e66	120	return ((l + ali - 1) & ~(ali - 1));
22be093f LP	121	}
22be093f LP	122
5f86c1f4	123	#define ALIGN_TO_PTR(p, ali) ((void*) ALIGN_TO((unsigned long) (p), (ali)))
49aa47c7	124
625e870b DH	125	/* align to next higher power-of-2 (except for: 0 => 0, overflow => 0) */
	126	static inline unsigned long ALIGN_POWER2(unsigned long u) {
	127	/* clz(0) is undefined */
	128	if (u == 1)
	129	return 1;
	130
	131	/* left-shift overflow is undefined */
	132	if (__builtin_clzl(u - 1UL) < 1)
	133	return 0;
	134
	135	return 1UL << (sizeof(u) * 8 - __builtin_clzl(u - 1UL));
	136	}
	137
7f39a210 MS	138	#define ELEMENTSOF(x) \
	139	__extension__ (__builtin_choose_expr( \
	140	!__builtin_types_compatible_p(typeof(x), typeof(&*(x))), \
	141	sizeof(x)/sizeof((x)[0]), \
	142	(void)0))
bbc98d32 KS	143	/*
	144	* container_of - cast a member of a structure out to the containing structure
	145	* @ptr: the pointer to the member.
	146	* @type: the type of the container struct this is embedded in.
	147	* @member: the name of the member within the struct.
bbc98d32	148	*/
fb835651 DH	149	#define container_of(ptr, type, member) __container_of(UNIQ, (ptr), type, member)
fb835651 DH	150	#define __container_of(uniq, ptr, type, member) \
fa70beaa	151	__extension__ ({ \
fb835651 DH	152	const typeof( ((type)0)->member ) UNIQ_T(A, uniq) = (ptr); \
	153	(type)( (char )UNIQ_T(A, uniq) - offsetof(type,member) ); \
	154	})
bbc98d32	155
9607d947	156	#undef MAX
667a0377 DH	157	#define MAX(a, b) __MAX(UNIQ, (a), UNIQ, (b))
667a0377 DH	158	#define __MAX(aq, a, bq, b) \
fdcba430	159	__extension__ ({ \
667a0377 DH	160	const typeof(a) UNIQ_T(A, aq) = (a); \
	161	const typeof(b) UNIQ_T(B, bq) = (b); \
	162	UNIQ_T(A,aq) > UNIQ_T(B,bq) ? UNIQ_T(A,aq) : UNIQ_T(B,bq); \
	163	})
60918275	164
7242d742 DH	165	/* evaluates to (void) if _A or _B are not constant or of different types */
	166	#define CONST_MAX(_A, _B) \
	167	__extension__ (__builtin_choose_expr( \
	168	__builtin_constant_p(_A) && \
	169	__builtin_constant_p(_B) && \
	170	__builtin_types_compatible_p(typeof(_A), typeof(_B)), \
	171	((_A) > (_B)) ? (_A) : (_B), \
	172	(void)0))
	173
40a1eebd DH	174	/* takes two types and returns the size of the larger one */
	175	#define MAXSIZE(A, B) (sizeof(union _packed_ { typeof(A) a; typeof(B) b; }))
	176
fdcba430 DH	177	#define MAX3(x,y,z) \
	178	__extension__ ({ \
	179	const typeof(x) _c = MAX(x,y); \
	180	MAX(_c, z); \
9607d947	181	})
3b63d2d3	182
9607d947	183	#undef MIN
667a0377 DH	184	#define MIN(a, b) __MIN(UNIQ, (a), UNIQ, (b))
667a0377 DH	185	#define __MIN(aq, a, bq, b) \
fdcba430	186	__extension__ ({ \
667a0377 DH	187	const typeof(a) UNIQ_T(A, aq) = (a); \
	188	const typeof(b) UNIQ_T(B, bq) = (b); \
	189	UNIQ_T(A,aq) < UNIQ_T(B,bq) ? UNIQ_T(A,aq) : UNIQ_T(B,bq); \
	190	})
60918275	191
fdcba430 DH	192	#define MIN3(x,y,z) \
	193	__extension__ ({ \
	194	const typeof(x) _c = MIN(x,y); \
	195	MIN(_c, z); \
7df23077 DH	196	})
7df23077 DH	197
667a0377 DH	198	#define LESS_BY(a, b) __LESS_BY(UNIQ, (a), UNIQ, (b))
667a0377 DH	199	#define __LESS_BY(aq, a, bq, b) \
fdcba430	200	__extension__ ({ \
667a0377 DH	201	const typeof(a) UNIQ_T(A, aq) = (a); \
	202	const typeof(b) UNIQ_T(B, bq) = (b); \
	203	UNIQ_T(A,aq) > UNIQ_T(B,bq) ? UNIQ_T(A,aq) - UNIQ_T(B,bq) : 0; \
	204	})
348ced90	205
667a0377 DH	206	#undef CLAMP
	207	#define CLAMP(x, low, high) __CLAMP(UNIQ, (x), UNIQ, (low), UNIQ, (high))
	208	#define __CLAMP(xq, x, lowq, low, highq, high) \
60918275	209	__extension__ ({ \
667a0377 DH	210	const typeof(x) UNIQ_T(X,xq) = (x); \
	211	const typeof(low) UNIQ_T(LOW,lowq) = (low); \
	212	const typeof(high) UNIQ_T(HIGH,highq) = (high); \
	213	UNIQ_T(X,xq) > UNIQ_T(HIGH,highq) ? \
	214	UNIQ_T(HIGH,highq) : \
	215	UNIQ_T(X,xq) < UNIQ_T(LOW,lowq) ? \
	216	UNIQ_T(LOW,lowq) : \
	217	UNIQ_T(X,xq); \
	218	})
60918275	219
180a60bc DH	220	/* [(x + y - 1) / y] suffers from an integer overflow, even though the
	221	* computation should be possible in the given type. Therefore, we use
	222	* [x / y + !!(x % y)]. Note that on "Real CPUs" a division returns both the
	223	* quotient and the remainder, so both should be equally fast. */
	224	#define DIV_ROUND_UP(_x, _y) \
	225	__extension__ ({ \
	226	const typeof(_x) __x = (_x); \
	227	const typeof(_y) __y = (_y); \
	228	(__x / __y + !!(__x % __y)); \
	229	})
	230
34c38d2a	231	#define assert_message_se(expr, message) \
dd8f71ee	232	do { \
93a46b0b	233	if (_unlikely_(!(expr))) \
34c38d2a MS	234	log_assert_failed(message, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
	235	} while (false)
	236
	237	#define assert_se(expr) assert_message_se(expr, #expr)
dd8f71ee LP	238
	239	/* We override the glibc assert() here. */
	240	#undef assert
	241	#ifdef NDEBUG
9ed794a3	242	#define assert(expr) do {} while (false)
dd8f71ee	243	#else
34c38d2a	244	#define assert(expr) assert_message_se(expr, #expr)
dd8f71ee	245	#endif
60918275	246
dd8f71ee LP	247	#define assert_not_reached(t) \
dd8f71ee LP	248	do { \
b7f33638	249	log_assert_failed_unreachable(t, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
dd8f71ee	250	} while (false)
60918275	251
f791c684	252	#if defined(static_assert)
7ebe131a LP	253	/* static_assert() is sometimes defined in a way that trips up
	254	* -Wdeclaration-after-statement, hence let's temporarily turn off
	255	* this warning around it. */
	256	#define assert_cc(expr) \
	257	DISABLE_WARNING_DECLARATION_AFTER_STATEMENT; \
	258	static_assert(expr, #expr); \
	259	REENABLE_WARNING
f791c684	260	#else
7ebe131a LP	261	#define assert_cc(expr) \
7ebe131a LP	262	DISABLE_WARNING_DECLARATION_AFTER_STATEMENT; \
6825a04d	263	struct CONCATENATE(_assert_struct_, __COUNTER__) { \
7ebe131a LP	264	char x[(expr) ? 0 : -1]; \
	265	}; \
	266	REENABLE_WARNING
f791c684	267	#endif
60918275	268
34c38d2a MS	269	#define assert_log(expr, message) ((_likely_(expr)) \
	270	? (true) \
	271	: (log_assert_failed_return(message, __FILE__, __LINE__, __PRETTY_FUNCTION__), false))
366e6411	272
80514f9c LP	273	#define assert_return(expr, r) \
80514f9c LP	274	do { \
34c38d2a	275	if (!assert_log(expr, #expr)) \
80514f9c	276	return (r); \
18387b59 LP	277	} while (false)
18387b59 LP	278
aa029628 TG	279	#define assert_return_errno(expr, r, err) \
aa029628 TG	280	do { \
34c38d2a	281	if (!assert_log(expr, #expr)) { \
aa029628 TG	282	errno = err; \
	283	return (r); \
	284	} \
	285	} while (false)
	286
a3dc3547 KS	287	#define PTR_TO_INT(p) ((int) ((intptr_t) (p)))
a3dc3547 KS	288	#define INT_TO_PTR(u) ((void *) ((intptr_t) (u)))
60918275	289	#define PTR_TO_UINT(p) ((unsigned int) ((uintptr_t) (p)))
a3dc3547	290	#define UINT_TO_PTR(u) ((void *) ((uintptr_t) (u)))
60918275	291
a3dc3547 KS	292	#define PTR_TO_LONG(p) ((long) ((intptr_t) (p)))
a3dc3547 KS	293	#define LONG_TO_PTR(u) ((void *) ((intptr_t) (u)))
c6c18be3	294	#define PTR_TO_ULONG(p) ((unsigned long) ((uintptr_t) (p)))
a3dc3547	295	#define ULONG_TO_PTR(u) ((void *) ((uintptr_t) (u)))
c6c18be3	296
a3dc3547 KS	297	#define PTR_TO_INT32(p) ((int32_t) ((intptr_t) (p)))
	298	#define INT32_TO_PTR(u) ((void *) ((intptr_t) (u)))
	299	#define PTR_TO_UINT32(p) ((uint32_t) ((uintptr_t) (p)))
	300	#define UINT32_TO_PTR(u) ((void *) ((uintptr_t) (u)))
60918275	301
a3dc3547 KS	302	#define PTR_TO_INT64(p) ((int64_t) ((intptr_t) (p)))
	303	#define INT64_TO_PTR(u) ((void *) ((intptr_t) (u)))
	304	#define PTR_TO_UINT64(p) ((uint64_t) ((uintptr_t) (p)))
	305	#define UINT64_TO_PTR(u) ((void *) ((uintptr_t) (u)))
c6c18be3	306
74b2466e LP	307	#define PTR_TO_SIZE(p) ((size_t) ((uintptr_t) (p)))
	308	#define SIZE_TO_PTR(u) ((void *) ((uintptr_t) (u)))
	309
a9c55a88 LP	310	#define CHAR_TO_STR(x) ((char[2]) { x, 0 })
a9c55a88 LP	311
034c6ed7 LP	312	#define char_array_0(x) x[sizeof(x)-1] = 0;
034c6ed7 LP	313
fa70beaa LP	314	/* Returns the number of chars needed to format variables of the
fa70beaa LP	315	* specified type as a decimal string. Adds in extra space for a
b7ce6b59 LP	316	* negative '-' prefix (hence works correctly on signed
b7ce6b59 LP	317	* types). Includes space for the trailing NUL. */
fa70beaa	318	#define DECIMAL_STR_MAX(type) \
5bcb0f2b	319	(2+(sizeof(type) <= 1 ? 3 : \
fa70beaa LP	320	sizeof(type) <= 2 ? 5 : \
	321	sizeof(type) <= 4 ? 10 : \
	322	sizeof(type) <= 8 ? 20 : sizeof(int[-2*(sizeof(type) > 8)])))
	323
0d1dbeb3 LP	324	#define DECIMAL_STR_WIDTH(x) \
	325	({ \
	326	typeof(x) _x_ = (x); \
	327	unsigned ans = 1; \
	328	while (_x_ /= 10) \
	329	ans++; \
	330	ans; \
	331	})
	332
264ad849 LP	333	#define SET_FLAG(v, flag, b) \
	334	(v) = (b) ? ((v) \| (flag)) : ((v) & ~(flag))
	335
d5b26d50 DM	336	#define CASE_F(X) case X:
	337	#define CASE_F_1(CASE, X) CASE_F(X)
	338	#define CASE_F_2(CASE, X, ...) CASE(X) CASE_F_1(CASE, __VA_ARGS__)
	339	#define CASE_F_3(CASE, X, ...) CASE(X) CASE_F_2(CASE, __VA_ARGS__)
	340	#define CASE_F_4(CASE, X, ...) CASE(X) CASE_F_3(CASE, __VA_ARGS__)
	341	#define CASE_F_5(CASE, X, ...) CASE(X) CASE_F_4(CASE, __VA_ARGS__)
	342	#define CASE_F_6(CASE, X, ...) CASE(X) CASE_F_5(CASE, __VA_ARGS__)
	343	#define CASE_F_7(CASE, X, ...) CASE(X) CASE_F_6(CASE, __VA_ARGS__)
	344	#define CASE_F_8(CASE, X, ...) CASE(X) CASE_F_7(CASE, __VA_ARGS__)
	345	#define CASE_F_9(CASE, X, ...) CASE(X) CASE_F_8(CASE, __VA_ARGS__)
	346	#define CASE_F_10(CASE, X, ...) CASE(X) CASE_F_9(CASE, __VA_ARGS__)
	347	#define CASE_F_11(CASE, X, ...) CASE(X) CASE_F_10(CASE, __VA_ARGS__)
	348	#define CASE_F_12(CASE, X, ...) CASE(X) CASE_F_11(CASE, __VA_ARGS__)
	349	#define CASE_F_13(CASE, X, ...) CASE(X) CASE_F_12(CASE, __VA_ARGS__)
	350	#define CASE_F_14(CASE, X, ...) CASE(X) CASE_F_13(CASE, __VA_ARGS__)
	351	#define CASE_F_15(CASE, X, ...) CASE(X) CASE_F_14(CASE, __VA_ARGS__)
	352	#define CASE_F_16(CASE, X, ...) CASE(X) CASE_F_15(CASE, __VA_ARGS__)
	353	#define CASE_F_17(CASE, X, ...) CASE(X) CASE_F_16(CASE, __VA_ARGS__)
	354	#define CASE_F_18(CASE, X, ...) CASE(X) CASE_F_17(CASE, __VA_ARGS__)
	355	#define CASE_F_19(CASE, X, ...) CASE(X) CASE_F_18(CASE, __VA_ARGS__)
	356	#define CASE_F_20(CASE, X, ...) CASE(X) CASE_F_19(CASE, __VA_ARGS__)
	357
	358	#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
	359	#define FOR_EACH_MAKE_CASE(...) \
	360	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, \
	361	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) \
	362	(CASE_F,__VA_ARGS__)
	363
	364	#define IN_SET(x, ...) \
	365	({ \
	366	bool _found = false; \
	367	/* If the build breaks in the line below, you need to extend the case macros */ \
	368	static _unused_ char _static_assert__macros_need_to_be_extended[20 - sizeof((int[]){__VA_ARGS__})/sizeof(int)]; \
	369	switch(x) { \
	370	FOR_EACH_MAKE_CASE(__VA_ARGS__) \
	371	_found = true; \
	372	break; \
	373	default: \
	374	break; \
	375	} \
	376	_found; \
cabb7806 LP	377	})
cabb7806 LP	378
35aa04e9 LP	379	#define SWAP_TWO(x, y) do { \
	380	typeof(x) _t = (x); \
	381	(x) = (y); \
	382	(y) = (_t); \
	383	} while (false)
	384
919ce0b7 SL	385	/* Define C11 thread_local attribute even on older gcc compiler
919ce0b7 SL	386	* version */
ec202eae SL	387	#ifndef thread_local
	388	/*
	389	* Don't break on glibc < 2.16 that doesn't define __STDC_NO_THREADS__
	390	* see http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53769
	391	*/
	392	#if __STDC_VERSION__ >= 201112L && !(defined(__STDC_NO_THREADS__) \|\| (defined(__GNU_LIBRARY__) && __GLIBC__ == 2 && __GLIBC_MINOR__ < 16))
	393	#define thread_local _Thread_local
	394	#else
	395	#define thread_local __thread
	396	#endif
	397	#endif
cabb7806	398
919ce0b7 SL	399	/* Define C11 noreturn without <stdnoreturn.h> and even on older gcc
	400	* compiler versions */
	401	#ifndef noreturn
	402	#if __STDC_VERSION__ >= 201112L
	403	#define noreturn _Noreturn
	404	#else
	405	#define noreturn __attribute__((noreturn))
	406	#endif
	407	#endif
	408
a2341f68 ZJS	409	#define DEFINE_TRIVIAL_CLEANUP_FUNC(type, func) \
	410	static inline void func##p(type *p) { \
	411	if (*p) \
	412	func(*p); \
	413	} \
	414	struct __useless_struct_to_allow_trailing_semicolon__
	415
dd8f71ee	416	#include "log.h"