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Add preprocessor support for additional architectures

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- _M_ARM is used by Microsoft [1]
- __riscv and __riscv_xlen are defined by [2]
- __sparc and __sparc__ are documented at [3]
- __MIPSEB__, __PPC__, __PPC64__ are documented at [3] and used in
  Chromium's build/build_config.h [4]
  Note: Chromium assumes that all PowerPC architectures are 64-bit. This
  is in fact not true.

[1]: https://docs.microsoft.com/en-us/cpp/preprocessor/predefined-macros?view=msvc-160
[2]: feca479356 (cc-preprocessor-definitions)
[3]: https://sourceforge.net/p/predef/wiki/Architectures/
[4]: https://source.chromium.org/chromium/chromium/src/+/master:build/build_config.h;drc=e12bf2e5ff1eacb9aca3e9a26bdeebdbdad5965a

Change-Id: I7d0176c38102e5e4cf0fcbe9b06a3520a79b0d71
Bug: webrtc:12312
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/198241
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Timothy Gu <timothygu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#32897}
This commit is contained in:
Timothy Gu 2020-12-17 22:41:43 -08:00 committed by Commit Bot
parent 3111783aa1
commit 6215ba804e
1 changed files with 33 additions and 4 deletions
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37
rtc_base/system/arch.h
View File

@ -15,8 +15,9 @@
#define RTC_BASE_SYSTEM_ARCH_H_
// Processor architecture detection. For more info on what's defined, see:
// http://msdn.microsoft.com/en-us/library/b0084kay.aspx
// http://www.agner.org/optimize/calling_conventions.pdf
// 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
@ -32,17 +33,45 @@
#define WEBRTC_ARCH_X86
#define WEBRTC_ARCH_32_BITS
#define WEBRTC_ARCH_LITTLE_ENDIAN
#elif defined(__ARMEL__)
#elif defined(_M_ARM) || defined(__ARMEL__)
#define WEBRTC_ARCH_ARM_FAMILY
#define WEBRTC_ARCH_32_BITS
#define WEBRTC_ARCH_LITTLE_ENDIAN
#elif defined(__MIPSEL__)
#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