attrib.h

/*-
 * SSLsplit - transparent SSL/TLS interception
 * https://www.roe.ch/SSLsplit
 *
 * Copyright (c) 2009-2019, Daniel Roethlisberger <daniel@roe.ch>.
 * All rights reserved.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER 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 HOLDER 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.
 */

#ifndef ATTRIB_H
#define ATTRIB_H

/*
 * GCC attributes and built-ins for improved compile-time error checking
 * and performance optimization.
 *
 * All of these are fully optional and are automatically disabled on non-GCC
 * and non-LLVM/clang compilers.
 */

/*
 * Attributes.
 * These serve to improve the compiler warnings or optimizations.
 */

#if !defined(__GNUC__) && !defined(__clang__)
#define __attribute__(x) 
#endif

#define UNUSED          __attribute__((unused))
#define NORET           __attribute__((noreturn))
#define PRINTF(f,a)     __attribute__((format(printf,(f),(a))))
#define SCANF(f,a)      __attribute__((format(scanf,(f),(a))))
#define WUNRES          __attribute__((warn_unused_result))
#define MALLOC          __attribute__((malloc)) WUNRES
#define NONNULL(...)    __attribute__((nonnull(__VA_ARGS__)))
#define PURE            __attribute__((pure))

/*
 * Branch prediction macros.
 * These serve to tell the compiler which of the branches is more likely.
 */

#if !defined(__GNUC__) && !defined(__clang__)
#define likely(expr)    (expr)
#define unlikely(expr)  (expr)
#else
#define likely(expr)    __builtin_expect((expr), 1)
#define unlikely(expr)  __builtin_expect((expr), 0)
#endif

#endif /* !ATTRIB_H */

/* vim: set noet ft=c: */