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Diffstat (limited to 'src/fundamental/macro-fundamental.h')
| -rw-r--r-- | src/fundamental/macro-fundamental.h | 354 |
1 files changed, 354 insertions, 0 deletions
diff --git a/src/fundamental/macro-fundamental.h b/src/fundamental/macro-fundamental.h new file mode 100644 index 0000000..097ad18 --- /dev/null +++ b/src/fundamental/macro-fundamental.h @@ -0,0 +1,354 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ +#pragma once + +#ifndef SD_BOOT +# include <assert.h> +#endif + +#include <limits.h> +#include <stdbool.h> +#include <stddef.h> +#include <stdint.h> + +#define _align_(x) __attribute__((__aligned__(x))) +#define _alignas_(x) __attribute__((__aligned__(__alignof__(x)))) +#define _alignptr_ __attribute__((__aligned__(sizeof(void *)))) +#define _cleanup_(x) __attribute__((__cleanup__(x))) +#define _const_ __attribute__((__const__)) +#define _deprecated_ __attribute__((__deprecated__)) +#define _destructor_ __attribute__((__destructor__)) +#define _hidden_ __attribute__((__visibility__("hidden"))) +#define _likely_(x) (__builtin_expect(!!(x), 1)) +#define _malloc_ __attribute__((__malloc__)) +#define _noinline_ __attribute__((noinline)) +#define _noreturn_ _Noreturn +#define _packed_ __attribute__((__packed__)) +#define _printf_(a, b) __attribute__((__format__(printf, a, b))) +#define _public_ __attribute__((__visibility__("default"))) +#define _pure_ __attribute__((__pure__)) +#define _retain_ __attribute__((__retain__)) +#define _returns_nonnull_ __attribute__((__returns_nonnull__)) +#define _section_(x) __attribute__((__section__(x))) +#define _sentinel_ __attribute__((__sentinel__)) +#define _unlikely_(x) (__builtin_expect(!!(x), 0)) +#define _unused_ __attribute__((__unused__)) +#define _used_ __attribute__((__used__)) +#define _warn_unused_result_ __attribute__((__warn_unused_result__)) +#define _weak_ __attribute__((__weak__)) +#define _weakref_(x) __attribute__((__weakref__(#x))) + +#ifdef __clang__ +# define _alloc_(...) +#else +# define _alloc_(...) __attribute__((__alloc_size__(__VA_ARGS__))) +#endif + +#if __GNUC__ >= 7 || (defined(__clang__) && __clang_major__ >= 10) +# define _fallthrough_ __attribute__((__fallthrough__)) +#else +# define _fallthrough_ +#endif + +#define XSTRINGIFY(x) #x +#define STRINGIFY(x) XSTRINGIFY(x) + +#ifndef __COVERITY__ +# define VOID_0 ((void)0) +#else +# define VOID_0 ((void*)0) +#endif + +#define ELEMENTSOF(x) \ + (__builtin_choose_expr( \ + !__builtin_types_compatible_p(typeof(x), typeof(&*(x))), \ + sizeof(x)/sizeof((x)[0]), \ + VOID_0)) + +#define XCONCATENATE(x, y) x ## y +#define CONCATENATE(x, y) XCONCATENATE(x, y) + +#ifdef SD_BOOT + _noreturn_ void efi_assert(const char *expr, const char *file, unsigned line, const char *function); + + #ifdef NDEBUG + #define assert(expr) ({ if (!(expr)) __builtin_unreachable(); }) + #define assert_not_reached() __builtin_unreachable() + #else + #define assert(expr) ({ _likely_(expr) ? VOID_0 : efi_assert(#expr, __FILE__, __LINE__, __PRETTY_FUNCTION__); }) + #define assert_not_reached() efi_assert("Code should not be reached", __FILE__, __LINE__, __PRETTY_FUNCTION__) + #endif + #define static_assert _Static_assert + #define assert_se(expr) ({ _likely_(expr) ? VOID_0 : efi_assert(#expr, __FILE__, __LINE__, __PRETTY_FUNCTION__); }) +#endif + +/* This passes the argument through after (if asserts are enabled) checking that it is not null. */ +#define ASSERT_PTR(expr) _ASSERT_PTR(expr, UNIQ_T(_expr_, UNIQ), assert) +#define ASSERT_SE_PTR(expr) _ASSERT_PTR(expr, UNIQ_T(_expr_, UNIQ), assert_se) +#define _ASSERT_PTR(expr, var, check) \ + ({ \ + typeof(expr) var = (expr); \ + check(var); \ + var; \ + }) + +#define ASSERT_NONNEG(expr) \ + ({ \ + typeof(expr) _expr_ = (expr), _zero = 0; \ + assert(_expr_ >= _zero); \ + _expr_; \ + }) + +#define ASSERT_SE_NONNEG(expr) \ + ({ \ + typeof(expr) _expr_ = (expr), _zero = 0; \ + assert_se(_expr_ >= _zero); \ + _expr_; \ + }) + +#define assert_cc(expr) static_assert(expr, #expr) + + +#define UNIQ_T(x, uniq) CONCATENATE(__unique_prefix_, CONCATENATE(x, uniq)) +#define UNIQ __COUNTER__ + +/* Note that this works differently from pthread_once(): this macro does + * not synchronize code execution, i.e. code that is run conditionalized + * on this macro will run concurrently to all other code conditionalized + * the same way, there's no ordering or completion enforced. */ +#define ONCE __ONCE(UNIQ_T(_once_, UNIQ)) +#define __ONCE(o) \ + ({ \ + static bool (o) = false; \ + __atomic_exchange_n(&(o), true, __ATOMIC_SEQ_CST); \ + }) + +#undef MAX +#define MAX(a, b) __MAX(UNIQ, (a), UNIQ, (b)) +#define __MAX(aq, a, bq, b) \ + ({ \ + 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 IS_UNSIGNED_INTEGER_TYPE(type) \ + (__builtin_types_compatible_p(typeof(type), unsigned char) || \ + __builtin_types_compatible_p(typeof(type), unsigned short) || \ + __builtin_types_compatible_p(typeof(type), unsigned) || \ + __builtin_types_compatible_p(typeof(type), unsigned long) || \ + __builtin_types_compatible_p(typeof(type), unsigned long long)) + +#define IS_SIGNED_INTEGER_TYPE(type) \ + (__builtin_types_compatible_p(typeof(type), signed char) || \ + __builtin_types_compatible_p(typeof(type), signed short) || \ + __builtin_types_compatible_p(typeof(type), signed) || \ + __builtin_types_compatible_p(typeof(type), signed long) || \ + __builtin_types_compatible_p(typeof(type), signed long long)) + +/* Evaluates to (void) if _A or _B are not constant or of different types (being integers of different sizes + * is also OK as long as the signedness matches) */ +#define CONST_MAX(_A, _B) \ + (__builtin_choose_expr( \ + __builtin_constant_p(_A) && \ + __builtin_constant_p(_B) && \ + (__builtin_types_compatible_p(typeof(_A), typeof(_B)) || \ + (IS_UNSIGNED_INTEGER_TYPE(_A) && IS_UNSIGNED_INTEGER_TYPE(_B)) || \ + (IS_SIGNED_INTEGER_TYPE(_A) && IS_SIGNED_INTEGER_TYPE(_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) \ + ({ \ + const typeof(x) _c = MAX(x, y); \ + MAX(_c, z); \ + }) + +#define MAX4(x, y, z, a) \ + ({ \ + const typeof(x) _d = MAX3(x, y, z); \ + MAX(_d, a); \ + }) + +#undef MIN +#define MIN(a, b) __MIN(UNIQ, (a), UNIQ, (b)) +#define __MIN(aq, a, bq, b) \ + ({ \ + 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_MIN(_A, _B) \ + (__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)) + +#define MIN3(x, y, z) \ + ({ \ + const typeof(x) _c = MIN(x, y); \ + MIN(_c, z); \ + }) + +/* Returns true if the passed integer is a positive power of two */ +#define CONST_ISPOWEROF2(x) \ + ((x) > 0 && ((x) & ((x) - 1)) == 0) + +#define ISPOWEROF2(x) \ + __builtin_choose_expr( \ + __builtin_constant_p(x), \ + CONST_ISPOWEROF2(x), \ + ({ \ + const typeof(x) _x = (x); \ + CONST_ISPOWEROF2(_x); \ + })) + +#define LESS_BY(a, b) __LESS_BY(UNIQ, (a), UNIQ, (b)) +#define __LESS_BY(aq, a, bq, b) \ + ({ \ + 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; \ + }) + +#define CMP(a, b) __CMP(UNIQ, (a), UNIQ, (b)) +#define __CMP(aq, a, bq, b) \ + ({ \ + const typeof(a) UNIQ_T(A, aq) = (a); \ + const typeof(b) UNIQ_T(B, bq) = (b); \ + UNIQ_T(A, aq) < UNIQ_T(B, bq) ? -1 : \ + UNIQ_T(A, aq) > UNIQ_T(B, bq) ? 1 : 0; \ + }) + +#undef CLAMP +#define CLAMP(x, low, high) __CLAMP(UNIQ, (x), UNIQ, (low), UNIQ, (high)) +#define __CLAMP(xq, x, lowq, low, highq, high) \ + ({ \ + 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) __DIV_ROUND_UP(UNIQ, (x), UNIQ, (y)) +#define __DIV_ROUND_UP(xq, x, yq, y) \ + ({ \ + const typeof(x) UNIQ_T(X, xq) = (x); \ + const typeof(y) UNIQ_T(Y, yq) = (y); \ + (UNIQ_T(X, xq) / UNIQ_T(Y, yq) + !!(UNIQ_T(X, xq) % UNIQ_T(Y, yq))); \ + }) + +#define CASE_F_1(X) case X: +#define CASE_F_2(X, ...) case X: CASE_F_1( __VA_ARGS__) +#define CASE_F_3(X, ...) case X: CASE_F_2( __VA_ARGS__) +#define CASE_F_4(X, ...) case X: CASE_F_3( __VA_ARGS__) +#define CASE_F_5(X, ...) case X: CASE_F_4( __VA_ARGS__) +#define CASE_F_6(X, ...) case X: CASE_F_5( __VA_ARGS__) +#define CASE_F_7(X, ...) case X: CASE_F_6( __VA_ARGS__) +#define CASE_F_8(X, ...) case X: CASE_F_7( __VA_ARGS__) +#define CASE_F_9(X, ...) case X: CASE_F_8( __VA_ARGS__) +#define CASE_F_10(X, ...) case X: CASE_F_9( __VA_ARGS__) +#define CASE_F_11(X, ...) case X: CASE_F_10( __VA_ARGS__) +#define CASE_F_12(X, ...) case X: CASE_F_11( __VA_ARGS__) +#define CASE_F_13(X, ...) case X: CASE_F_12( __VA_ARGS__) +#define CASE_F_14(X, ...) case X: CASE_F_13( __VA_ARGS__) +#define CASE_F_15(X, ...) case X: CASE_F_14( __VA_ARGS__) +#define CASE_F_16(X, ...) case X: CASE_F_15( __VA_ARGS__) +#define CASE_F_17(X, ...) case X: CASE_F_16( __VA_ARGS__) +#define CASE_F_18(X, ...) case X: CASE_F_17( __VA_ARGS__) +#define CASE_F_19(X, ...) case X: CASE_F_18( __VA_ARGS__) +#define CASE_F_20(X, ...) case X: CASE_F_19( __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) \ + (__VA_ARGS__) + +#define IN_SET(x, ...) \ + ({ \ + bool _found = false; \ + /* If the build breaks in the line below, you need to extend the case macros. We use typeof(+x) \ + * here to widen the type of x if it is a bit-field as this would otherwise be illegal. */ \ + static const typeof(+x) __assert_in_set[] _unused_ = { __VA_ARGS__ }; \ + assert_cc(ELEMENTSOF(__assert_in_set) <= 20); \ + switch (x) { \ + FOR_EACH_MAKE_CASE(__VA_ARGS__) \ + _found = true; \ + break; \ + default: \ + break; \ + } \ + _found; \ + }) + +/* Takes inspiration from Rust's Option::take() method: reads and returns a pointer, but at the same time + * resets it to NULL. See: https://doc.rust-lang.org/std/option/enum.Option.html#method.take */ +#define TAKE_PTR(ptr) \ + ({ \ + typeof(ptr) *_pptr_ = &(ptr); \ + typeof(ptr) _ptr_ = *_pptr_; \ + *_pptr_ = NULL; \ + _ptr_; \ + }) + +/* + * STRLEN - return the length of a string literal, minus the trailing NUL byte. + * Contrary to strlen(), this is a constant expression. + * @x: a string literal. + */ +#define STRLEN(x) (sizeof(""x"") - sizeof(typeof(x[0]))) + +#define mfree(memory) \ + ({ \ + free(memory); \ + (typeof(memory)) NULL; \ + }) + +static inline size_t ALIGN_TO(size_t l, size_t ali) { + assert(ISPOWEROF2(ali)); + + if (l > SIZE_MAX - (ali - 1)) + return SIZE_MAX; /* indicate overflow */ + + return ((l + ali - 1) & ~(ali - 1)); +} + +#define ALIGN4(l) ALIGN_TO(l, 4) +#define ALIGN8(l) ALIGN_TO(l, 8) +#ifndef SD_BOOT +/* libefi also provides ALIGN, and we do not use them in sd-boot explicitly. */ +#define ALIGN(l) ALIGN_TO(l, sizeof(void*)) +#define ALIGN_PTR(p) ((void*) ALIGN((uintptr_t) (p))) +#endif + +/* Same as ALIGN_TO but callable in constant contexts. */ +#define CONST_ALIGN_TO(l, ali) \ + __builtin_choose_expr( \ + __builtin_constant_p(l) && \ + __builtin_constant_p(ali) && \ + CONST_ISPOWEROF2(ali) && \ + (l <= SIZE_MAX - (ali - 1)), /* overflow? */ \ + ((l) + (ali) - 1) & ~((ali) - 1), \ + VOID_0) + +#define UPDATE_FLAG(orig, flag, b) \ + ((b) ? ((orig) | (flag)) : ((orig) & ~(flag))) +#define SET_FLAG(v, flag, b) \ + (v) = UPDATE_FLAG(v, flag, b) +#define FLAGS_SET(v, flags) \ + ((~(v) & (flags)) == 0) |