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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright 2023 Red Hat
*/
#ifndef PERMASSERT_H
#define PERMASSERT_H
#include <linux/compiler.h>
#include "errors.h"
/* Utilities for asserting that certain conditions are met */
#define STRINGIFY(X) #X
/*
* A hack to apply the "warn if unused" attribute to an integral expression.
*
* Since GCC doesn't propagate the warn_unused_result attribute to conditional expressions
* incorporating calls to functions with that attribute, this function can be used to wrap such an
* expression. With optimization enabled, this function contributes no additional instructions, but
* the warn_unused_result attribute still applies to the code calling it.
*/
static inline int __must_check vdo_must_use(int value)
{
return value;
}
/* Assert that an expression is true and return an error if it is not. */
#define VDO_ASSERT(expr, ...) vdo_must_use(__VDO_ASSERT(expr, __VA_ARGS__))
/* Log a message if the expression is not true. */
#define VDO_ASSERT_LOG_ONLY(expr, ...) __VDO_ASSERT(expr, __VA_ARGS__)
#define __VDO_ASSERT(expr, ...) \
(likely(expr) ? VDO_SUCCESS \
: vdo_assertion_failed(STRINGIFY(expr), __FILE__, __LINE__, __VA_ARGS__))
/* Log an assertion failure message. */
int vdo_assertion_failed(const char *expression_string, const char *file_name,
int line_number, const char *format, ...)
__printf(4, 5);
#endif /* PERMASSERT_H */
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