/src/google/protobuf/stubs/port.h

// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.  All rights reserved.
// https://developers.google.com/protocol-buffers/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * 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.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// 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
// OWNER 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 GOOGLE_PROTOBUF_STUBS_PORT_H_
#define GOOGLE_PROTOBUF_STUBS_PORT_H_

#include <assert.h>
#include <stdlib.h>
#include <cstddef>
#include <string>
#include <string.h>
#if defined(__osf__)
// Tru64 lacks stdint.h, but has inttypes.h which defines a superset of
// what stdint.h would define.
#include <inttypes.h>
#elif !defined(_MSC_VER)
#include <stdint.h>
#endif

#undef PROTOBUF_LITTLE_ENDIAN
#ifdef _WIN32
  // Assuming windows is always little-endian.
  // TODO(xiaofeng): The PROTOBUF_LITTLE_ENDIAN is not only used for
  // optimization but also for correctness. We should define an
  // different macro to test the big-endian code path in coded_stream.
  #if !defined(PROTOBUF_DISABLE_LITTLE_ENDIAN_OPT_FOR_TEST)
    #define PROTOBUF_LITTLE_ENDIAN 1
  #endif
  #if _MSC_VER >= 1300 && !defined(__INTEL_COMPILER)
    // If MSVC has "/RTCc" set, it will complain about truncating casts at
    // runtime.  This file contains some intentional truncating casts.
    #pragma runtime_checks("c", off)
  #endif
#else
  #include <sys/param.h>   // __BYTE_ORDER
  #if ((defined(__LITTLE_ENDIAN__) && !defined(__BIG_ENDIAN__)) || \
         (defined(__BYTE_ORDER) && __BYTE_ORDER == __LITTLE_ENDIAN)) && \
      !defined(PROTOBUF_DISABLE_LITTLE_ENDIAN_OPT_FOR_TEST)
    #define PROTOBUF_LITTLE_ENDIAN 1
  #endif
#endif
#if defined(_MSC_VER) && defined(PROTOBUF_USE_DLLS)
  #ifdef LIBPROTOBUF_EXPORTS
    #define LIBPROTOBUF_EXPORT __declspec(dllexport)
  #else
    #define LIBPROTOBUF_EXPORT __declspec(dllimport)
  #endif
  #ifdef LIBPROTOC_EXPORTS
    #define LIBPROTOC_EXPORT   __declspec(dllexport)
  #else
    #define LIBPROTOC_EXPORT   __declspec(dllimport)
  #endif
#else
  #define LIBPROTOBUF_EXPORT
  #define LIBPROTOC_EXPORT
#endif

// These #includes are for the byte swap functions declared later on.
#ifdef _MSC_VER
#include <stdlib.h>  // NOLINT(build/include)
#elif defined(__APPLE__)
#include <libkern/OSByteOrder.h>
#elif defined(__GLIBC__) || defined(__CYGWIN__)
#include <byteswap.h>  // IWYU pragma: export
#endif

// ===================================================================
// from google3/base/port.h
namespace google {
namespace protobuf {

typedef unsigned int uint;

#ifdef _MSC_VER
typedef signed __int8  int8;
typedef __int16 int16;
typedef __int32 int32;
typedef __int64 int64;

typedef unsigned __int8  uint8;
typedef unsigned __int16 uint16;
typedef unsigned __int32 uint32;
typedef unsigned __int64 uint64;
#else
typedef signed char  int8;
typedef short int16;
typedef int int32;
typedef long long int64;

typedef unsigned char  uint8;
typedef unsigned short uint16;
typedef unsigned int uint32;
typedef unsigned long long uint64;
#endif

// long long macros to be used because gcc and vc++ use different suffixes,
// and different size specifiers in format strings
#undef GOOGLE_LONGLONG
#undef GOOGLE_ULONGLONG
#undef GOOGLE_LL_FORMAT

#ifdef _MSC_VER
#define GOOGLE_LONGLONG(x) x##I64
#define GOOGLE_ULONGLONG(x) x##UI64
#define GOOGLE_LL_FORMAT "I64"  // As in printf("%I64d", ...)
#else
#define GOOGLE_LONGLONG(x) x##LL
#define GOOGLE_ULONGLONG(x) x##ULL
#define GOOGLE_LL_FORMAT "ll"  // As in "%lld". Note that "q" is poor form also.
#endif

static const int32 kint32max = 0x7FFFFFFF;
static const int32 kint32min = -kint32max - 1;
static const int64 kint64max = GOOGLE_LONGLONG(0x7FFFFFFFFFFFFFFF);
static const int64 kint64min = -kint64max - 1;
static const uint32 kuint32max = 0xFFFFFFFFu;
static const uint64 kuint64max = GOOGLE_ULONGLONG(0xFFFFFFFFFFFFFFFF);

// -------------------------------------------------------------------
// Annotations:  Some parts of the code have been annotated in ways that might
//   be useful to some compilers or tools, but are not supported universally.
//   You can #define these annotations yourself if the default implementation
//   is not right for you.

#ifndef GOOGLE_ATTRIBUTE_ALWAYS_INLINE
#if defined(__GNUC__) && (__GNUC__ > 3 ||(__GNUC__ == 3 && __GNUC_MINOR__ >= 1))
// For functions we want to force inline.
// Introduced in gcc 3.1.
#define GOOGLE_ATTRIBUTE_ALWAYS_INLINE __attribute__ ((always_inline))
#else
// Other compilers will have to figure it out for themselves.
#define GOOGLE_ATTRIBUTE_ALWAYS_INLINE
#endif
#endif

#ifndef GOOGLE_ATTRIBUTE_NOINLINE
#if defined(__GNUC__) && (__GNUC__ > 3 ||(__GNUC__ == 3 && __GNUC_MINOR__ >= 1))
// For functions we want to force not inline.
// Introduced in gcc 3.1.
#define GOOGLE_ATTRIBUTE_NOINLINE __attribute__ ((noinline))
#elif defined(_MSC_VER) && (_MSC_VER >= 1400)
// Seems to have been around since at least Visual Studio 2005
#define GOOGLE_ATTRIBUTE_NOINLINE __declspec(noinline)
#else
// Other compilers will have to figure it out for themselves.
#define GOOGLE_ATTRIBUTE_NOINLINE
#endif
#endif

#ifndef GOOGLE_ATTRIBUTE_NORETURN
#ifdef __GNUC__
// Tell the compiler that a given function never returns.
#define GOOGLE_ATTRIBUTE_NORETURN __attribute__((noreturn))
#else
#define GOOGLE_ATTRIBUTE_NORETURN
#endif
#endif

#ifndef GOOGLE_ATTRIBUTE_DEPRECATED
#ifdef __GNUC__
// If the method/variable/type is used anywhere, produce a warning.
#define GOOGLE_ATTRIBUTE_DEPRECATED __attribute__((deprecated))
#else
#define GOOGLE_ATTRIBUTE_DEPRECATED
#endif
#endif

#ifndef GOOGLE_PREDICT_TRUE
#ifdef __GNUC__
// Provided at least since GCC 3.0.
#define GOOGLE_PREDICT_TRUE(x) (__builtin_expect(!!(x), 1))
#else
#define GOOGLE_PREDICT_TRUE(x) (x)
#endif
#endif

#ifndef GOOGLE_PREDICT_FALSE
#ifdef __GNUC__
// Provided at least since GCC 3.0.
#define GOOGLE_PREDICT_FALSE(x) (__builtin_expect(x, 0))
#else
#define GOOGLE_PREDICT_FALSE(x) (x)
#endif
#endif

// Delimits a block of code which may write to memory which is simultaneously
// written by other threads, but which has been determined to be thread-safe
// (e.g. because it is an idempotent write).
#ifndef GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN
#define GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN()
#endif
#ifndef GOOGLE_SAFE_CONCURRENT_WRITES_END
#define GOOGLE_SAFE_CONCURRENT_WRITES_END()
#endif

#if defined(__clang__) && defined(__has_cpp_attribute) \
    && !defined(GOOGLE_PROTOBUF_OS_APPLE)
# if defined(GOOGLE_PROTOBUF_OS_NACL) || defined(EMSCRIPTEN) || \
     __has_cpp_attribute(clang::fallthrough)
#  define GOOGLE_FALLTHROUGH_INTENDED [[clang::fallthrough]]
# endif
#endif

#ifndef GOOGLE_FALLTHROUGH_INTENDED
# define GOOGLE_FALLTHROUGH_INTENDED
#endif

#define GOOGLE_GUARDED_BY(x)
#define GOOGLE_ATTRIBUTE_COLD

// x86 and x86-64 can perform unaligned loads/stores directly.
#if defined(_M_X64) || defined(__x86_64__) || \
    defined(_M_IX86) || defined(__i386__)

#define GOOGLE_UNALIGNED_LOAD16(_p) (*reinterpret_cast<const uint16 *>(_p))
#define GOOGLE_UNALIGNED_LOAD32(_p) (*reinterpret_cast<const uint32 *>(_p))
#define GOOGLE_UNALIGNED_LOAD64(_p) (*reinterpret_cast<const uint64 *>(_p))

#define GOOGLE_UNALIGNED_STORE16(_p, _val) (*reinterpret_cast<uint16 *>(_p) = (_val))
#define GOOGLE_UNALIGNED_STORE32(_p, _val) (*reinterpret_cast<uint32 *>(_p) = (_val))
#define GOOGLE_UNALIGNED_STORE64(_p, _val) (*reinterpret_cast<uint64 *>(_p) = (_val))

#else
inline uint16 GOOGLE_UNALIGNED_LOAD16(const void *p) {
  uint16 t;
  memcpy(&t, p, sizeof t);
  return t;
}

inline uint32 GOOGLE_UNALIGNED_LOAD32(const void *p) {
  uint32 t;
  memcpy(&t, p, sizeof t);
  return t;
}

inline uint64 GOOGLE_UNALIGNED_LOAD64(const void *p) {
  uint64 t;
  memcpy(&t, p, sizeof t);
  return t;
}

inline void GOOGLE_UNALIGNED_STORE16(void *p, uint16 v) {
  memcpy(p, &v, sizeof v);
}

inline void GOOGLE_UNALIGNED_STORE32(void *p, uint32 v) {
  memcpy(p, &v, sizeof v);
}

inline void GOOGLE_UNALIGNED_STORE64(void *p, uint64 v) {
  memcpy(p, &v, sizeof v);
}
#endif

#if defined(_MSC_VER)
#define GOOGLE_THREAD_LOCAL __declspec(thread)
#else
#define GOOGLE_THREAD_LOCAL __thread
#endif

// The following guarantees declaration of the byte swap functions.
#ifdef _MSC_VER
#define bswap_16(x) _byteswap_ushort(x)
#define bswap_32(x) _byteswap_ulong(x)
#define bswap_64(x) _byteswap_uint64(x)

#elif defined(__APPLE__)
// Mac OS X / Darwin features
#define bswap_16(x) OSSwapInt16(x)
#define bswap_32(x) OSSwapInt32(x)
#define bswap_64(x) OSSwapInt64(x)

#elif !defined(__GLIBC__) && !defined(__CYGWIN__)

static inline uint16 bswap_16(uint16 x) {
  return static_cast<uint16>(((x & 0xFF) << 8) | ((x & 0xFF00) >> 8));
}
#define bswap_16(x) bswap_16(x)
static inline uint32 bswap_32(uint32 x) {
  return (((x & 0xFF) << 24) |
          ((x & 0xFF00) << 8) |
          ((x & 0xFF0000) >> 8) |
          ((x & 0xFF000000) >> 24));
}
#define bswap_32(x) bswap_32(x)
static inline uint64 bswap_64(uint64 x) {
  return (((x & GOOGLE_ULONGLONG(0xFF)) << 56) |
          ((x & GOOGLE_ULONGLONG(0xFF00)) << 40) |
          ((x & GOOGLE_ULONGLONG(0xFF0000)) << 24) |
          ((x & GOOGLE_ULONGLONG(0xFF000000)) << 8) |
          ((x & GOOGLE_ULONGLONG(0xFF00000000)) >> 8) |
          ((x & GOOGLE_ULONGLONG(0xFF0000000000)) >> 24) |
          ((x & GOOGLE_ULONGLONG(0xFF000000000000)) >> 40) |
          ((x & GOOGLE_ULONGLONG(0xFF00000000000000)) >> 56));
}
#define bswap_64(x) bswap_64(x)

#endif

// ===================================================================
// from google3/util/endian/endian.h
LIBPROTOBUF_EXPORT uint32 ghtonl(uint32 x);

class BigEndian {
 public:
#ifdef PROTOBUF_LITTLE_ENDIAN

  static uint16 FromHost16(uint16 x) { return bswap_16(x); }
  static uint16 ToHost16(uint16 x) { return bswap_16(x); }

  static uint32 FromHost32(uint32 x) { return bswap_32(x); }
  static uint32 ToHost32(uint32 x) { return bswap_32(x); }

  static uint64 FromHost64(uint64 x) { return bswap_64(x); }
  static uint64 ToHost64(uint64 x) { return bswap_64(x); }

  static bool IsLittleEndian() { return true; }

#else

  static uint16 FromHost16(uint16 x) { return x; }
  static uint16 ToHost16(uint16 x) { return x; }

  static uint32 FromHost32(uint32 x) { return x; }
  static uint32 ToHost32(uint32 x) { return x; }

  static uint64 FromHost64(uint64 x) { return x; }
  static uint64 ToHost64(uint64 x) { return x; }

  static bool IsLittleEndian() { return false; }

#endif /* ENDIAN */

  // Functions to do unaligned loads and stores in big-endian order.
  static uint16 Load16(const void *p) {
    return ToHost16(GOOGLE_UNALIGNED_LOAD16(p));
  }

  static void Store16(void *p, uint16 v) {
    GOOGLE_UNALIGNED_STORE16(p, FromHost16(v));
  }

  static uint32 Load32(const void *p) {
    return ToHost32(GOOGLE_UNALIGNED_LOAD32(p));
  }

  static void Store32(void *p, uint32 v) {
    GOOGLE_UNALIGNED_STORE32(p, FromHost32(v));
  }

  static uint64 Load64(const void *p) {
    return ToHost64(GOOGLE_UNALIGNED_LOAD64(p));
  }

  static void Store64(void *p, uint64 v) {
    GOOGLE_UNALIGNED_STORE64(p, FromHost64(v));
  }
};


}  // namespace protobuf
}  // namespace google

#endif  // GOOGLE_PROTOBUF_STUBS_PORT_H_