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Filename : sysprof-macros.h
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/* sysprof-macros.h
 *
 * Copyright 2020 Endless OS Foundation
 *
 * Author:
 *  - Philip Withnall <withnall@endlessm.com>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * Subject to the terms and conditions of this license, each copyright holder
 * and contributor hereby grants to those receiving rights under this license
 * a perpetual, worldwide, non-exclusive, no-charge, royalty-free,
 * irrevocable (except for failure to satisfy the conditions of this license)
 * patent license to make, have made, use, offer to sell, sell, import, and
 * otherwise transfer this software, where such license applies only to those
 * patent claims, already acquired or hereafter acquired, licensable by such
 * copyright holder or contributor that are necessarily infringed by:
 *
 * (a) their Contribution(s) (the licensed copyrights of copyright holders
 *     and non-copyrightable additions of contributors, in source or binary
 *     form) alone; or
 *
 * (b) combination of their Contribution(s) with the work of authorship to
 *     which such Contribution(s) was added by such copyright holder or
 *     contributor, if, at the time the Contribution is added, such addition
 *     causes such combination to be necessarily infringed. The patent license
 *     shall not apply to any other combinations which include the
 *     Contribution.
 *
 * Except as expressly stated above, no rights or licenses from any copyright
 * holder or contributor is granted under this license, whether expressly, by
 * implication, estoppel or otherwise.
 *
 * DISCLAIMER
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * SPDX-License-Identifier: BSD-2-Clause-Patent
 */

#pragma once

#include <limits.h>

#ifdef __GNUC__
#define SYSPROF_GNUC_CHECK_VERSION(major, minor) \
    ((__GNUC__ > (major)) || \
     ((__GNUC__ == (major)) && \
      (__GNUC_MINOR__ >= (minor))))
#else
#define SYSPROF_GNUC_CHECK_VERSION(major, minor) 0
#endif

#ifdef __cpp_static_assert
# define SYSPROF_STATIC_ASSERT(expr, msg) static_assert(expr, msg)
#elif SYSPROF_GNUC_CHECK_VERSION(4, 6)
# define SYSPROF_STATIC_ASSERT(expr, msg) _Static_assert(expr, msg)
#else
# define _SYSPROF_STATIC_ASSERT2(expr, msg, id) typedef char __static_assert_##id[(expr) ? 0 : -1];
# define _SYSPROF_STATIC_ASSERT(expr, msg, id) _SYSPROF_STATIC_ASSERT2(expr, msg, id)
# define SYSPROF_STATIC_ASSERT(expr, msg) _SYSPROF_STATIC_ASSERT(expr, msg, __COUNTER__)
#endif

#if INT_MAX == LONG_MAX
#define SYSPROF_INT64_CONSTANT(x) x##ULL
#define SYSPROF_UINT64_CONSTANT(x) x##LL
#else
#define SYSPROF_INT64_CONSTANT(x) x##UL
#define SYSPROF_UINT64_CONSTANT(x) x##L
#endif

#ifdef __cplusplus
#define SYSPROF_BEGIN_DECLS extern "C" {
#define SYSPROF_END_DECLS }
#define SYSPROF_RESTRICT /* nothing */
#else
#define SYSPROF_BEGIN_DECLS
#define SYSPROF_END_DECLS
#define SYSPROF_RESTRICT restrict
#endif

#if defined (__GNUC__)
#define SYSPROF_INTERNAL __attribute__((visibility("hidden")))
#else
#define SYSPROF_INTERNAL
#endif

#if defined(__GNUC__)
#define SYSPROF_LIKELY(expr) (__builtin_expect (!!(expr), 1))
#define SYSPROF_UNLIKELY(expr) (__builtin_expect (!!(expr), 0))
#else
#define SYSPROF_LIKELY(expr) (expr)
#define SYSPROF_UNLIKELY(expr) (expr)
#endif

#if defined(__GNUC__)
#define SYSPROF_PRINTF(format_idx, arg_idx) __attribute__((format(printf, format_idx, arg_idx)))
#else
#define SYSPROF_PRINTF(format_idx, arg_idx)
#endif