util.h

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/**********************************************************************
 * Copyright (c) 2018 Pieter Wuille, Greg Maxwell, Gleb Naumenko      *
 * Distributed under the MIT software license, see the accompanying   *
 * file LICENSE or http://www.opensource.org/licenses/mit-license.php.*
 **********************************************************************/
 
#ifndef _MINISKETCH_UTIL_H_
#define _MINISKETCH_UTIL_H_
 
#ifdef MINISKETCH_VERIFY
#include <stdio.h>
#endif
 
#if !defined(__GNUC_PREREQ)
# 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
#endif
 
#if __GNUC_PREREQ(3, 0)
#define EXPECT(x,c) __builtin_expect((x),(c))
#else
#define EXPECT(x,c) (x)
#endif
 
#if defined(__has_cpp_attribute)
#  if __has_cpp_attribute(maybe_unused)
#    define MAYBE_UNUSED [[maybe_unused]]
#  endif
#endif
 
#ifndef MAYBE_UNUSED
#  if defined(__GNUC__)
#    define MAYBE_UNUSED __attribute__((unused))
#  else
#    define MAYBE_UNUSED
#  endif
#endif
 
/* Assertion macros */
 
#define CHECK(cond) do { \
    if (EXPECT(!(cond), 0)) { \
        fprintf(stderr, "%s:%d: %s\n", __FILE__, __LINE__, "Check condition failed: " #cond); \
        abort(); \
    } \
} while(0)
 
#ifdef MINISKETCH_VERIFY
#define CHECK_SAFE(cond) CHECK(cond)
#else
#define CHECK_SAFE(cond)
#endif
 
#ifdef MINISKETCH_VERIFY
#define CHECK_RETURN(cond, rvar) do { \
    if (EXPECT(!(cond), 0)) { \
        fprintf(stderr, "%s:%d: %s\n", __FILE__, __LINE__, "Check condition failed: " #cond); \
        abort(); \
        return rvar; /* Does nothing, but causes compile to warn on incorrect return types. */ \
    } \
} while(0)
#else
#define CHECK_RETURN(cond, rvar) do { \
    if (EXPECT(!(cond), 0)) { \
        return rvar; \
    } \
} while(0)
#endif
 
#endif