src/rtc_base/system/arch.h

/*
 *  Copyright (c) 2018 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.
 */

// This file contains platform-specific typedefs and defines.
// Much of it is derived from Chromium's build/build_config.h.

#ifndef RTC_BASE_SYSTEM_ARCH_H_
#define RTC_BASE_SYSTEM_ARCH_H_

// Processor architecture detection.  For more info on what's defined, see:
//   https://docs.microsoft.com/en-us/cpp/preprocessor/predefined-macros
//   https://www.agner.org/optimize/calling_conventions.pdf
//   https://sourceforge.net/p/predef/wiki/Architectures/
//   or with gcc, run: "echo | gcc -E -dM -"
#if defined(_M_X64) || defined(__x86_64__)
#define WEBRTC_ARCH_X86_FAMILY
#define WEBRTC_ARCH_X86_64
#define WEBRTC_ARCH_64_BITS
#define WEBRTC_ARCH_LITTLE_ENDIAN
#elif defined(_M_ARM64) || defined(__aarch64__)
#define WEBRTC_ARCH_ARM_FAMILY
#define WEBRTC_ARCH_64_BITS
#define WEBRTC_ARCH_LITTLE_ENDIAN
#elif defined(_M_IX86) || defined(__i386__)
#define WEBRTC_ARCH_X86_FAMILY
#define WEBRTC_ARCH_X86
#define WEBRTC_ARCH_32_BITS
#define WEBRTC_ARCH_LITTLE_ENDIAN
#elif defined(_M_ARM) || defined(__ARMEL__)
#define WEBRTC_ARCH_ARM_FAMILY
#define WEBRTC_ARCH_32_BITS
#define WEBRTC_ARCH_LITTLE_ENDIAN
#elif defined(__MIPSEL__) || defined(__MIPSEB__)
#define WEBRTC_ARCH_MIPS_FAMILY
#if defined(__LP64__)
#define WEBRTC_ARCH_64_BITS
#else
#define WEBRTC_ARCH_32_BITS
#endif
#if defined(__MIPSEL__)
#define WEBRTC_ARCH_LITTLE_ENDIAN
#else
#define WEBRTC_ARCH_BIG_ENDIAN
#endif
#elif defined(__PPC__)
#if defined(__PPC64__)
#define WEBRTC_ARCH_64_BITS
#else
#define WEBRTC_ARCH_32_BITS
#endif
#if defined(__LITTLE_ENDIAN__)
#define WEBRTC_ARCH_LITTLE_ENDIAN
#else
#define WEBRTC_ARCH_BIG_ENDIAN
#endif
#elif defined(__sparc) || defined(__sparc__)
#if __SIZEOF_LONG__ == 8
#define WEBRTC_ARCH_64_BITS
#else
#define WEBRTC_ARCH_32_BITS
#endif
#define WEBRTC_ARCH_BIG_ENDIAN
#elif defined(__riscv) && __riscv_xlen == 64
#define WEBRTC_ARCH_64_BITS
#define WEBRTC_ARCH_LITTLE_ENDIAN
#elif defined(__riscv) && __riscv_xlen == 32
#define WEBRTC_ARCH_32_BITS
#define WEBRTC_ARCH_LITTLE_ENDIAN
#elif defined(__pnacl__)
#define WEBRTC_ARCH_32_BITS
#define WEBRTC_ARCH_LITTLE_ENDIAN
#elif defined(__EMSCRIPTEN__)
#define WEBRTC_ARCH_32_BITS
#define WEBRTC_ARCH_LITTLE_ENDIAN
#else
#error Please add support for your architecture in rtc_base/system/arch.h
#endif

#if !(defined(WEBRTC_ARCH_LITTLE_ENDIAN) ^ defined(WEBRTC_ARCH_BIG_ENDIAN))
#error Define either WEBRTC_ARCH_LITTLE_ENDIAN or WEBRTC_ARCH_BIG_ENDIAN
#endif

#endif  // RTC_BASE_SYSTEM_ARCH_H_