types.h

/*
   american fuzzy lop - type definitions and minor macros
   ------------------------------------------------------

   Written and maintained by Michal Zalewski <lcamtuf@google.com>

   Copyright 2013, 2014, 2015 Google Inc. All rights reserved.

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at:

     http://www.apache.org/licenses/LICENSE-2.0

 */

#ifndef _HAVE_TYPES_H
#define _HAVE_TYPES_H

#include <stdint.h>
#include <stdlib.h>

typedef uint8_t  u8;
typedef uint16_t u16;
typedef uint32_t u32;

/*

   Ugh. There is an unintended compiler / glibc #include glitch caused by
   combining the u64 type an %llu in format strings, necessitating a workaround.

   In essence, the compiler is always looking for 'unsigned long long' for %llu.
   On 32-bit systems, the u64 type (aliased to uint64_t) is expanded to
   'unsigned long long' in <bits/types.h>, so everything checks out.

   But on 64-bit systems, it is #ifdef'ed in the same file as 'unsigned long'.
   Now, it only happens in circumstances where the type happens to have the
   expected bit width, *but* the compiler does not know that... and complains
   about 'unsigned long' being unsafe to pass to %llu.

 */

#ifdef __x86_64__
typedef unsigned long long u64;
#else
typedef uint64_t u64;
#endif /* ^__x86_64__ */

typedef int8_t   s8;
typedef int16_t  s16;
typedef int32_t  s32;
typedef int64_t  s64;

#ifndef MIN
#  define MIN(_a,_b) ((_a) > (_b) ? (_b) : (_a))
#  define MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
#endif /* !MIN */

#define SWAP16(_x) ({ \
    u16 _ret = (_x); \
    (u16)((_ret << 8) | (_ret >> 8)); \
  })

#define SWAP32(_x) ({ \
    u32 _ret = (_x); \
    (u32)((_ret << 24) | (_ret >> 24) | \
          ((_ret << 8) & 0x00FF0000) | \
          ((_ret >> 8) & 0x0000FF00)); \
  })

#ifdef AFL_LLVM_PASS
#  define AFL_R(x) (random() % (x))
#else
#  define R(x) (random() % (x))
#endif /* ^AFL_LLVM_PASS */

#define STRINGIFY_INTERNAL(x) #x
#define STRINGIFY(x) STRINGIFY_INTERNAL(x)

#define MEM_BARRIER() \
  asm volatile("" ::: "memory")

#define likely(_x)   __builtin_expect(!!(_x), 1)
#define unlikely(_x)  __builtin_expect(!!(_x), 0)

#endif /* ! _HAVE_TYPES_H */