rtc_base/basictypes.h

/*
 *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#ifndef RTC_BASE_BASICTYPES_H_
#define RTC_BASE_BASICTYPES_H_

#include <stddef.h>  // for NULL, size_t
#include <stdint.h>  // for uintptr_t and (u)int_t types.

// Detect compiler is for x86 or x64.
#if defined(__x86_64__) || defined(_M_X64) || \
    defined(__i386__) || defined(_M_IX86)
#define CPU_X86 1
#endif

// Detect compiler is for arm.
#if defined(__arm__) || defined(_M_ARM)
#define CPU_ARM 1
#endif

#if defined(CPU_X86) && defined(CPU_ARM)
#error CPU_X86 and CPU_ARM both defined.
#endif

#if !defined(RTC_ARCH_CPU_BIG_ENDIAN) && !defined(RTC_ARCH_CPU_LITTLE_ENDIAN)
// x86, arm or GCC provided __BYTE_ORDER__ macros
#if defined(CPU_X86) || defined(CPU_ARM) ||                             \
  (defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
#define RTC_ARCH_CPU_LITTLE_ENDIAN
#elif defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
#define RTC_ARCH_CPU_BIG_ENDIAN
#else
#error RTC_ARCH_CPU_BIG_ENDIAN or RTC_ARCH_CPU_LITTLE_ENDIAN should be defined.
#endif
#endif

#if defined(RTC_ARCH_CPU_BIG_ENDIAN) && defined(RTC_ARCH_CPU_LITTLE_ENDIAN)
#error RTC_ARCH_CPU_BIG_ENDIAN and RTC_ARCH_CPU_LITTLE_ENDIAN both defined.
#endif

#if defined(WEBRTC_WIN)
typedef int socklen_t;
#endif

// The following only works for C++
#ifdef __cplusplus

#ifndef ALIGNP
#define ALIGNP(p, t)                                             \
  (reinterpret_cast<uint8_t*>(((reinterpret_cast<uintptr_t>(p) + \
  ((t) - 1)) & ~((t) - 1))))
#endif

#define RTC_IS_ALIGNED(p, a) (!((uintptr_t)(p) & ((a) - 1)))

// Use these to declare and define a static local variable that gets leaked so
// that its destructors are not called at exit.
#define RTC_DEFINE_STATIC_LOCAL(type, name, arguments) \
  static type& name = *new type arguments

#endif  // __cplusplus

#endif  // RTC_BASE_BASICTYPES_H_