FuzzerDefs.h

//===- FuzzerDefs.h - Internal header for the Fuzzer ------------*- C++ -* ===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// Basic definitions.
//===----------------------------------------------------------------------===//

#ifndef LLVM_FUZZER_DEFS_H
#define LLVM_FUZZER_DEFS_H

#include <cassert>
#include <cstddef>
#include <cstdint>
#include <cstring>
#include <memory>
#include <set>
#include <string>
#include <vector>


// Platform detection.
#ifdef __linux__
#define LIBFUZZER_APPLE 0
#define LIBFUZZER_FUCHSIA 0
#define LIBFUZZER_LINUX 1
#define LIBFUZZER_NETBSD 0
#define LIBFUZZER_FREEBSD 0
#define LIBFUZZER_OPENBSD 0
#define LIBFUZZER_WINDOWS 0
#elif __APPLE__
#define LIBFUZZER_APPLE 1
#define LIBFUZZER_FUCHSIA 0
#define LIBFUZZER_LINUX 0
#define LIBFUZZER_NETBSD 0
#define LIBFUZZER_FREEBSD 0
#define LIBFUZZER_OPENBSD 0
#define LIBFUZZER_WINDOWS 0
#elif __NetBSD__
#define LIBFUZZER_APPLE 0
#define LIBFUZZER_FUCHSIA 0
#define LIBFUZZER_LINUX 0
#define LIBFUZZER_NETBSD 1
#define LIBFUZZER_FREEBSD 0
#define LIBFUZZER_OPENBSD 0
#define LIBFUZZER_WINDOWS 0
#elif __FreeBSD__
#define LIBFUZZER_APPLE 0
#define LIBFUZZER_FUCHSIA 0
#define LIBFUZZER_LINUX 0
#define LIBFUZZER_NETBSD 0
#define LIBFUZZER_FREEBSD 1
#define LIBFUZZER_OPENBSD 0
#define LIBFUZZER_WINDOWS 0
#elif __OpenBSD__
#define LIBFUZZER_APPLE 0
#define LIBFUZZER_FUCHSIA 0
#define LIBFUZZER_LINUX 0
#define LIBFUZZER_NETBSD 0
#define LIBFUZZER_FREEBSD 0
#define LIBFUZZER_OPENBSD 1
#define LIBFUZZER_WINDOWS 0
#elif _WIN32
#define LIBFUZZER_APPLE 0
#define LIBFUZZER_FUCHSIA 0
#define LIBFUZZER_LINUX 0
#define LIBFUZZER_NETBSD 0
#define LIBFUZZER_FREEBSD 0
#define LIBFUZZER_OPENBSD 0
#define LIBFUZZER_WINDOWS 1
#elif __Fuchsia__
#define LIBFUZZER_APPLE 0
#define LIBFUZZER_FUCHSIA 1
#define LIBFUZZER_LINUX 0
#define LIBFUZZER_NETBSD 0
#define LIBFUZZER_FREEBSD 0
#define LIBFUZZER_OPENBSD 0
#define LIBFUZZER_WINDOWS 0
#else
#error "Support for your platform has not been implemented"
#endif

#if defined(_MSC_VER) && !defined(__clang__)
// MSVC compiler is being used.
#define LIBFUZZER_MSVC 1
#else
#define LIBFUZZER_MSVC 0
#endif

#ifndef __has_attribute
#  define __has_attribute(x) 0
#endif

#define LIBFUZZER_POSIX                                                        \
  (LIBFUZZER_APPLE || LIBFUZZER_LINUX || LIBFUZZER_NETBSD ||                   \
   LIBFUZZER_FREEBSD || LIBFUZZER_OPENBSD)

#ifdef __x86_64
#  if __has_attribute(target)
#    define ATTRIBUTE_TARGET_POPCNT __attribute__((target("popcnt")))
#  else
#    define ATTRIBUTE_TARGET_POPCNT
#  endif
#else
#  define ATTRIBUTE_TARGET_POPCNT
#endif


#ifdef __clang__  // avoid gcc warning.
#  if __has_attribute(no_sanitize)
#    define ATTRIBUTE_NO_SANITIZE_MEMORY __attribute__((no_sanitize("memory")))
#  else
#    define ATTRIBUTE_NO_SANITIZE_MEMORY
#  endif
#  define ALWAYS_INLINE __attribute__((always_inline))
#else
#  define ATTRIBUTE_NO_SANITIZE_MEMORY
#  define ALWAYS_INLINE
#endif // __clang__

#if LIBFUZZER_WINDOWS
#define ATTRIBUTE_NO_SANITIZE_ADDRESS
#else
#define ATTRIBUTE_NO_SANITIZE_ADDRESS __attribute__((no_sanitize_address))
#endif

#if LIBFUZZER_WINDOWS
#define ATTRIBUTE_ALIGNED(X) __declspec(align(X))
#define ATTRIBUTE_INTERFACE __declspec(dllexport)
// This is used for __sancov_lowest_stack which is needed for
// -fsanitize-coverage=stack-depth. That feature is not yet available on
// Windows, so make the symbol static to avoid linking errors.
#define ATTRIBUTES_INTERFACE_TLS_INITIAL_EXEC static
#define ATTRIBUTE_NOINLINE __declspec(noinline)
#else
#define ATTRIBUTE_ALIGNED(X) __attribute__((aligned(X)))
#define ATTRIBUTE_INTERFACE __attribute__((visibility("default")))
#define ATTRIBUTES_INTERFACE_TLS_INITIAL_EXEC \
  ATTRIBUTE_INTERFACE __attribute__((tls_model("initial-exec"))) thread_local

#define ATTRIBUTE_NOINLINE __attribute__((noinline))
#endif

#if defined(__has_feature)
#  if __has_feature(address_sanitizer)
#    define ATTRIBUTE_NO_SANITIZE_ALL ATTRIBUTE_NO_SANITIZE_ADDRESS
#  elif __has_feature(memory_sanitizer)
#    define ATTRIBUTE_NO_SANITIZE_ALL ATTRIBUTE_NO_SANITIZE_MEMORY
#  else
#    define ATTRIBUTE_NO_SANITIZE_ALL
#  endif
#else
#  define ATTRIBUTE_NO_SANITIZE_ALL
#endif

namespace fuzzer {

template <class T> T Min(T a, T b) { return a < b ? a : b; }
template <class T> T Max(T a, T b) { return a > b ? a : b; }

class Random;
class Dictionary;
class DictionaryEntry;
class MutationDispatcher;
struct FuzzingOptions;
class InputCorpus;
struct InputInfo;
struct ExternalFunctions;

// Global interface to functions that may or may not be available.
extern ExternalFunctions *EF;

// We are using a custom allocator to give a different symbol name to STL
// containers in order to avoid ODR violations.
template<typename T>
  class fuzzer_allocator: public std::allocator<T> {
    public:
      fuzzer_allocator() = default;

      template<class U>
      fuzzer_allocator(const fuzzer_allocator<U>&) {}

      template<class Other>
      struct rebind { typedef fuzzer_allocator<Other> other;  };
  };

template<typename T>
using Vector = std::vector<T, fuzzer_allocator<T>>;

template<typename T>
using Set = std::set<T, std::less<T>, fuzzer_allocator<T>>;

typedef Vector<uint8_t> Unit;
typedef Vector<Unit> UnitVector;
typedef int (*UserCallback)(const uint8_t *Data, size_t Size);

int FuzzerDriver(int *argc, char ***argv, UserCallback Callback);

uint8_t *ExtraCountersBegin();
uint8_t *ExtraCountersEnd();
void ClearExtraCounters();

extern bool RunningUserCallback;

}  // namespace fuzzer

#endif  // LLVM_FUZZER_DEFS_H