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// SPDX-License-Identifier: BSD-2-Clause-Patent
#ifndef COMPILER_H_
#define COMPILER_H_
/*
* These are special ones that get our unit tests in trouble with the
* compiler optimizer dropping out tests...
*/
#ifdef NONNULL
# undef NONNULL
#endif
#ifdef RETURNS_NONNULL
# undef RETURNS_NONNULL
#endif
#ifdef SHIM_UNIT_TEST
# define NONNULL(first, args...)
# define RETURNS_NONNULL
#else
# define NONNULL(first, args...) __attribute__((__nonnull__(first, ## args)))
#if (defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 9)))
# define RETURNS_NONNULL __attribute__((__returns_nonnull__))
#else
# define RETURNS_NONNULL
#endif
#endif
#ifndef UNUSED
#define UNUSED __attribute__((__unused__))
#endif
#ifndef HIDDEN
#define HIDDEN __attribute__((__visibility__ ("hidden")))
#endif
#ifndef PUBLIC
#define PUBLIC __attribute__((__visibility__ ("default")))
#endif
#ifndef DEPRECATED
#define DEPRECATED __attribute__((__deprecated__))
#endif
#ifndef DESTRUCTOR
#define DESTRUCTOR __attribute__((destructor))
#endif
#ifndef CONSTRUCTOR
#define CONSTRUCTOR __attribute__((constructor))
#endif
#ifndef ALIAS
#define ALIAS(x) __attribute__((weak, alias (#x)))
#endif
#ifndef ALLOCFUNC
#if defined(__COVERITY__)
#define ALLOCFUNC(a, b)
#else
#define ALLOCFUNC(dealloc, dealloc_arg) __attribute__((__malloc__(dealloc, dealloc_arg)))
#endif
#endif
#ifndef PRINTF
#define PRINTF(first, args...) __attribute__((__format__(printf, first, ## args)))
#endif
#ifndef PURE
#define PURE __attribute__((__pure__))
#endif
#ifndef FLATTEN
#define FLATTEN __attribute__((__flatten__))
#endif
#ifndef PACKED
#define PACKED __attribute__((__packed__))
#endif
#ifndef VERSION
#define VERSION(sym, ver) __asm__(".symver " # sym "," # ver)
#endif
#ifndef NORETURN
#define NORETURN __attribute__((__noreturn__))
#endif
#ifndef ALIGNED
#define ALIGNED(n) __attribute__((__aligned__(n)))
#endif
#ifndef CLEANUP_FUNC
#define CLEANUP_FUNC(x) __attribute__((__cleanup__(x)))
#endif
#ifndef USED
#define USED __attribute__((__used__))
#endif
#ifndef SECTION
#define SECTION(x) __attribute__((__section__(x)))
#endif
#ifndef OPTIMIZE
#define OPTIMIZE(x) __attribute__((__optimize__(x)))
#endif
#ifndef __CONCAT
#define __CONCAT(a, b) a ## b
#endif
#ifndef __CONCAT3
#define __CONCAT3(a, b, c) a ## b ## c
#endif
#ifndef CAT
#define CAT(a, b) __CONCAT(a, b)
#endif
#ifndef CAT3
#define CAT3(a, b, c) __CONCAT3(a, b, c)
#endif
#ifndef STRING
#define STRING(x) __STRING(x)
#endif
#ifndef WRITE_ONCE
#define WRITE_ONCE(var, val) \
(*((volatile typeof(val) *)(&(var))) = (val))
#endif
#ifndef READ_ONCE
#define READ_ONCE(var) (*((volatile typeof(var) *)(&(var))))
#endif
#ifndef likely
#define likely(x) __builtin_expect(!!(x), 1)
#endif
#ifndef unlikely
#define unlikely(x) __builtin_expect(!!(x), 0)
#endif
/* Are two types/vars the same type (ignoring qualifiers)? */
#ifndef __same_type
#define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))
#endif
/* Compile time object size, -1 for unknown */
#ifndef __compiletime_object_size
# define __compiletime_object_size(obj) -1
#endif
#ifndef __compiletime_warning
# define __compiletime_warning(message)
#endif
#ifndef __compiletime_error
# define __compiletime_error(message)
#endif
#ifndef __compiletime_assert
#define __compiletime_assert(condition, msg, prefix, suffix) \
do { \
extern void prefix ## suffix(void) __compiletime_error(msg); \
if (!(condition)) \
prefix ## suffix(); \
} while (0)
#endif
#ifndef _compiletime_assert
#define _compiletime_assert(condition, msg, prefix, suffix) \
__compiletime_assert(condition, msg, prefix, suffix)
#endif
/**
* compiletime_assert - break build and emit msg if condition is false
* @condition: a compile-time constant condition to check
* @msg: a message to emit if condition is false
*
* In tradition of POSIX assert, this macro will break the build if the
* supplied condition is *false*, emitting the supplied error message if the
* compiler has support to do so.
*/
#ifndef compiletime_assert
#define compiletime_assert(condition, msg) \
_compiletime_assert(condition, msg, __compiletime_assert_, __LINE__ - 1)
#endif
/**
* BUILD_BUG_ON_MSG - break compile if a condition is true & emit supplied
* error message.
* @condition: the condition which the compiler should know is false.
*
* See BUILD_BUG_ON for description.
*/
#ifndef BUILD_BUG_ON_MSG
#define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
#endif
#ifndef ALIGN
#define __ALIGN_MASK(x, mask) (((x) + (mask)) & ~(mask))
#define __ALIGN(x, a) __ALIGN_MASK(x, (typeof(x))(a) - 1)
#define ALIGN(x, a) __ALIGN((x), (a))
#endif
#ifndef ALIGN_DOWN
#define ALIGN_DOWN(x, a) __ALIGN((x) - ((a) - 1), (a))
#endif
#define MIN(a, b) ({(a) < (b) ? (a) : (b);})
#define MAX(a, b) ({(a) <= (b) ? (b) : (a);})
/**
* Builtins that don't go in string.h
*/
#define unreachable() __builtin_unreachable()
#if defined(__GNUC__)
#define cache_invalidate(begin, end) __builtin___clear_cache(begin, end)
#else /* __GNUC__ */
#error shim has no cache_invalidate() implementation for this compiler
#endif /* __GNUC__ */
#if defined(__GNUC__) && defined(__GNUC_MINOR__)
#define GNUC_PREREQ(maj, min) \
((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
#else
#define GNUC_PREREQ(maj, min) 0
#endif
#if defined(__clang__) && defined(__clang_major__) && defined(__clang_minor__)
#define CLANG_PREREQ(maj, min) \
((__clang_major__ > (maj)) || \
(__clang_major__ == (maj) && __clang_minor__ >= (min)))
#else
#define CLANG_PREREQ(maj, min) 0
#endif
#if GNUC_PREREQ(5, 1) || CLANG_PREREQ(3, 8)
#define checked_add(addend0, addend1, sum) \
__builtin_add_overflow(addend0, addend1, sum)
#define checked_sub(minuend, subtrahend, difference) \
__builtin_sub_overflow(minuend, subtrahend, difference)
#define checked_mul(factor0, factor1, product) \
__builtin_mul_overflow(factor0, factor1, product)
#else
#define checked_add(a0, a1, s) \
({ \
(*s) = ((a0) + (a1)); \
0; \
})
#define checked_sub(s0, s1, d) \
({ \
(*d) = ((s0) - (s1)); \
0; \
})
#define checked_mul(f0, f1, p) \
({ \
(*p) = ((f0) * (f1)); \
0; \
})
#endif
#define checked_div(dividend, divisor, quotient) \
({ \
bool _ret = True; \
if ((divisor) != 0) { \
_ret = False; \
(quotient) = (dividend) / (divisor); \
} \
_ret; \
})
#endif /* !COMPILER_H_ */
// vim:fenc=utf-8:tw=75:et
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