diff options
author | Luke Shumaker <lukeshu@sbcglobal.net> | 2016-06-01 15:52:09 -0400 |
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committer | Luke Shumaker <lukeshu@sbcglobal.net> | 2016-06-01 15:52:09 -0400 |
commit | bb110bc7433adeb79b4814ef2a1c04e2160be396 (patch) | |
tree | c45048907133b8bbd7e2d86b350436a9ad0ffe8b /src/libbasic/macro.h | |
parent | 192d82912f055a2b4a2b5c02f0ef69b002322bba (diff) |
./move.sh
Diffstat (limited to 'src/libbasic/macro.h')
-rw-r--r-- | src/libbasic/macro.h | 395 |
1 files changed, 395 insertions, 0 deletions
diff --git a/src/libbasic/macro.h b/src/libbasic/macro.h new file mode 100644 index 0000000000..2695d0edb7 --- /dev/null +++ b/src/libbasic/macro.h @@ -0,0 +1,395 @@ +#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/types.h> + +#define _printf_(a,b) __attribute__ ((format (printf, a, b))) +#define _alloc_(...) __attribute__ ((alloc_size(__VA_ARGS__))) +#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 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" |