1 /* 2 * Copyright (c) 2012 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 // This file contains platform-specific typedefs and defines. 12 // Much of it is derived from Chromium's build/build_config.h. 13 14 #ifndef WEBRTC_TYPEDEFS_H_ 15 #define WEBRTC_TYPEDEFS_H_ 16 17 // Processor architecture detection. For more info on what's defined, see: 18 // http://msdn.microsoft.com/en-us/library/b0084kay.aspx 19 // http://www.agner.org/optimize/calling_conventions.pdf 20 // or with gcc, run: "echo | gcc -E -dM -" 21 #if defined(_M_X64) || defined(__x86_64__) 22 #define WEBRTC_ARCH_X86_FAMILY 23 #define WEBRTC_ARCH_X86_64 24 #define WEBRTC_ARCH_64_BITS 25 #define WEBRTC_ARCH_LITTLE_ENDIAN 26 #elif defined(__aarch64__) 27 #define WEBRTC_ARCH_64_BITS 28 #define WEBRTC_ARCH_LITTLE_ENDIAN 29 #elif defined(_M_IX86) || defined(__i386__) 30 #define WEBRTC_ARCH_X86_FAMILY 31 #define WEBRTC_ARCH_X86 32 #define WEBRTC_ARCH_32_BITS 33 #define WEBRTC_ARCH_LITTLE_ENDIAN 34 #elif defined(__ARMEL__) 35 // TODO(ajm): We'd prefer to control platform defines here, but this is 36 // currently provided by the Android makefiles. Commented to avoid duplicate 37 // definition warnings. 38 //#define WEBRTC_ARCH_ARM 39 // TODO(ajm): Chromium uses the following two defines. Should we switch? 40 //#define WEBRTC_ARCH_ARM_FAMILY 41 //#define WEBRTC_ARCH_ARMEL 42 #define WEBRTC_ARCH_32_BITS 43 #define WEBRTC_ARCH_LITTLE_ENDIAN 44 #elif defined(__MIPSEL__) 45 #define WEBRTC_ARCH_32_BITS 46 #define WEBRTC_ARCH_LITTLE_ENDIAN 47 #elif defined(__pnacl__) 48 #define WEBRTC_ARCH_32_BITS 49 #define WEBRTC_ARCH_LITTLE_ENDIAN 50 #else 51 /* instead of failing, use typical unix defines... */ 52 #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ 53 #define WEBRTC_ARCH_LITTLE_ENDIAN 54 #elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ 55 #define WEBRTC_ARCH_BIG_ENDIAN 56 #else 57 #error __BYTE_ORDER__ is not defined 58 #endif 59 #if defined(__LP64__) 60 #define WEBRTC_ARCH_64_BITS 61 #else 62 #define WEBRTC_ARCH_32_BITS 63 #endif 64 #endif 65 66 #if !(defined(WEBRTC_ARCH_LITTLE_ENDIAN) ^ defined(WEBRTC_ARCH_BIG_ENDIAN)) 67 #error Define either WEBRTC_ARCH_LITTLE_ENDIAN or WEBRTC_ARCH_BIG_ENDIAN 68 #endif 69 70 #if (defined(WEBRTC_ARCH_X86_FAMILY) && !defined(__SSE2__)) || \ 71 (defined(WEBRTC_ARCH_ARM_V7) && !defined(WEBRTC_ARCH_ARM_NEON)) 72 #define WEBRTC_CPU_DETECTION 73 #endif 74 75 #if !defined(_MSC_VER) 76 #include <stdint.h> 77 #else 78 // Define C99 equivalent types, since pre-2010 MSVC doesn't provide stdint.h. 79 typedef signed char int8_t; 80 typedef signed short int16_t; 81 typedef signed int int32_t; 82 typedef __int64 int64_t; 83 typedef unsigned char uint8_t; 84 typedef unsigned short uint16_t; 85 typedef unsigned int uint32_t; 86 typedef unsigned __int64 uint64_t; 87 #endif 88 89 // Borrowed from Chromium's base/compiler_specific.h. 90 // Annotate a virtual method indicating it must be overriding a virtual 91 // method in the parent class. 92 // Use like: 93 // virtual void foo() OVERRIDE; 94 #if defined(_MSC_VER) 95 #define OVERRIDE override 96 #elif defined(__clang__) 97 // Clang defaults to C++03 and warns about using override. Squelch that. 98 // Intentionally no push/pop here so all users of OVERRIDE ignore the warning 99 // too. This is like passing -Wno-c++11-extensions, except that GCC won't die 100 // (because it won't see this pragma). 101 #pragma clang diagnostic ignored "-Wc++11-extensions" 102 #define OVERRIDE override 103 #elif defined(__GNUC__) && __cplusplus >= 201103 && \ 104 (__GNUC__ * 10000 + __GNUC_MINOR__ * 100) >= 40700 105 // GCC 4.7 supports explicit virtual overrides when C++11 support is enabled. 106 #define OVERRIDE override 107 #else 108 #define OVERRIDE 109 #endif 110 111 // Annotate a function indicating the caller must examine the return value. 112 // Use like: 113 // int foo() WARN_UNUSED_RESULT; 114 // TODO(ajm): Hack to avoid multiple definitions until the base/ of webrtc and 115 // libjingle are merged. 116 #if !defined(WARN_UNUSED_RESULT) 117 #if defined(__GNUC__) 118 #define WARN_UNUSED_RESULT __attribute__((warn_unused_result)) 119 #else 120 #define WARN_UNUSED_RESULT 121 #endif 122 #endif // WARN_UNUSED_RESULT 123 124 // Put after a variable that might not be used, to prevent compiler warnings: 125 // int result ATTRIBUTE_UNUSED = DoSomething(); 126 // assert(result == 17); 127 #ifndef ATTRIBUTE_UNUSED 128 #if defined(__GNUC__) || defined(__clang__) 129 #define ATTRIBUTE_UNUSED __attribute__((unused)) 130 #else 131 #define ATTRIBUTE_UNUSED 132 #endif 133 #endif 134 135 // Macro to be used for switch-case fallthrough (required for enabling 136 // -Wimplicit-fallthrough warning on Clang). 137 #ifndef FALLTHROUGH 138 #if defined(__clang__) 139 #define FALLTHROUGH() [[clang::fallthrough]] 140 #else 141 #define FALLTHROUGH() do { } while (0) 142 #endif 143 #endif 144 145 // Annotate a function that will not return control flow to the caller. 146 #if defined(_MSC_VER) 147 #define NO_RETURN __declspec(noreturn) 148 #elif defined(__GNUC__) 149 #define NO_RETURN __attribute__((noreturn)) 150 #else 151 #define NO_RETURN 152 #endif 153 154 #endif // WEBRTC_TYPEDEFS_H_ 155