mirror of https://github.com/tailix/libkernaux.git
102 lines
2.7 KiB
C
102 lines
2.7 KiB
C
#ifndef KERNAUX_INCLUDED_MACRO
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#define KERNAUX_INCLUDED_MACRO
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stddef.h>
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#include <stdint.h>
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/*********************
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* Language features *
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*********************/
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#define KERNAUX_NORETURN __attribute__((noreturn))
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#define KERNAUX_RETURNS_TWICE __attribute__((returns_twice))
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#define KERNAUX_UNUSED __attribute__((unused))
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#define KERNAUX_USED __attribute__((used))
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#define KERNAUX_ALIGNED(num) __attribute__((aligned(num)))
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#define KERNAUX_PRINTF(fmt, rest) __attribute__((format(printf, fmt, rest)))
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#define KERNAUX_SECTION(name) __attribute__((section(name)))
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#ifdef __TINYC__
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# define KERNAUX_PACKED
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#else
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# define KERNAUX_PACKED __attribute__((packed))
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#endif
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#define KERNAUX_ASM(...) do { __asm__ __volatile__(__VA_ARGS__); } while (0)
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/**************
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* Visibility *
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**************/
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#ifdef KERNAUX_ACCESS_PRIVATE
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# define KERNAUX_PRIVATE_FIELD(id) id
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# define KERNAUX_PROTECTED_FIELD(id) id
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#else
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# define KERNAUX_PRIVATE_FIELD(id) _private_##id
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# ifdef KERNAUX_ACCESS_PROTECTED
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# define KERNAUX_PROTECTED_FIELD(id) id
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# else
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# define KERNAUX_PROTECTED_FIELD(id) _protected_##id
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# endif
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#endif // KERNAUX_ACCESS_PRIVATE
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/*********************
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* Static assertions *
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*********************/
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#define KERNAUX_STATIC_TEST(name, cond) \
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KERNAUX_UNUSED \
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static const int \
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_kernaux_static_test_##name[(cond) ? 1 : -1]
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#define KERNAUX_STATIC_TEST_STRUCT_SIZE(name, size) \
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KERNAUX_STATIC_TEST(struct_size_##name, sizeof(struct name) == (size))
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#define KERNAUX_STATIC_TEST_UNION_SIZE(name, size) \
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KERNAUX_STATIC_TEST(union_size_##name, sizeof(union name) == (size))
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/*****************
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* Simple values *
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*****************/
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#define KERNAUX_EOF (-1)
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/*********************
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* Calculated values *
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*********************/
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#define KERNAUX_CONTAINER_OF(ptr, type, member) \
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((type*)((uintptr_t)(ptr) - offsetof(type, member)))
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#define KERNAUX_BITS(n) (1u << (n))
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#define KERNAUX_BITS8(n) ((uint8_t )(((uint8_t )1) << (n)))
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#define KERNAUX_BITS16(n) ((uint16_t)(((uint16_t)1) << (n)))
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#define KERNAUX_BITS32(n) ((uint32_t)(((uint32_t)1) << (n)))
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#define KERNAUX_BITS64(n) ((uint64_t)(((uint64_t)1) << (n)))
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/*********************
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* Safe type casting *
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*********************/
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#define KERNAUX_CAST_VAR(type, name, value) \
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KERNAUX_STATIC_TEST(cast_pos_##name, sizeof(value) <= sizeof(type)); \
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KERNAUX_STATIC_TEST(cast_neg_##name, sizeof(-(value)) <= sizeof(type)); \
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type name = (type)(value); \
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do {} while (0)
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#define KERNAUX_CAST_CONST(type, name, value) \
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KERNAUX_CAST_VAR(const type, name, value)
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#ifdef __cplusplus
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}
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#endif
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#endif
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