| // Copyright 2017 The Abseil Authors. | |
| // | |
| // Licensed under the Apache License, Version 2.0 (the "License"); | |
| // you may not use this file except in compliance with the License. | |
| // You may obtain a copy of the License at | |
| // | |
| // https://www.apache.org/licenses/LICENSE-2.0 | |
| // | |
| // Unless required by applicable law or agreed to in writing, software | |
| // distributed under the License is distributed on an "AS IS" BASIS, | |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| // See the License for the specific language governing permissions and | |
| // limitations under the License. | |
| // SKIP_ABSL_INLINE_NAMESPACE_CHECK | |
| #ifndef ABSL_RANDOM_INTERNAL_PLATFORM_H_ | |
| #define ABSL_RANDOM_INTERNAL_PLATFORM_H_ | |
| // HERMETIC NOTE: The randen_hwaes target must not introduce duplicate | |
| // symbols from arbitrary system and other headers, since it may be built | |
| // with different flags from other targets, using different levels of | |
| // optimization, potentially introducing ODR violations. | |
| // ----------------------------------------------------------------------------- | |
| // Platform Feature Checks | |
| // ----------------------------------------------------------------------------- | |
| // Currently supported operating systems and associated preprocessor | |
| // symbols: | |
| // | |
| // Linux and Linux-derived __linux__ | |
| // Android __ANDROID__ (implies __linux__) | |
| // Linux (non-Android) __linux__ && !__ANDROID__ | |
| // Darwin (macOS and iOS) __APPLE__ | |
| // Akaros (http://akaros.org) __ros__ | |
| // Windows _WIN32 | |
| // AsmJS __asmjs__ | |
| // WebAssembly __wasm__ | |
| // Fuchsia __Fuchsia__ | |
| // | |
| // Note that since Android defines both __ANDROID__ and __linux__, one | |
| // may probe for either Linux or Android by simply testing for __linux__. | |
| // | |
| // NOTE: For __APPLE__ platforms, we use #include <TargetConditionals.h> | |
| // to distinguish os variants. | |
| // | |
| // http://nadeausoftware.com/articles/2012/01/c_c_tip_how_use_compiler_predefined_macros_detect_operating_system | |
| #if defined(__APPLE__) | |
| #include <TargetConditionals.h> | |
| #endif | |
| // ----------------------------------------------------------------------------- | |
| // Architecture Checks | |
| // ----------------------------------------------------------------------------- | |
| // These preprocessor directives are trying to determine CPU architecture, | |
| // including necessary headers to support hardware AES. | |
| // | |
| // ABSL_ARCH_{X86/PPC/ARM} macros determine the platform. | |
| #if defined(__x86_64__) || defined(__x86_64) || defined(_M_AMD64) || \ | |
| defined(_M_X64) | |
| #define ABSL_ARCH_X86_64 | |
| #elif defined(__i386) || defined(_M_IX86) | |
| #define ABSL_ARCH_X86_32 | |
| #elif defined(__aarch64__) || defined(__arm64__) || defined(_M_ARM64) | |
| #define ABSL_ARCH_AARCH64 | |
| #elif defined(__arm__) || defined(__ARMEL__) || defined(_M_ARM) | |
| #define ABSL_ARCH_ARM | |
| #elif defined(__powerpc64__) || defined(__PPC64__) || defined(__powerpc__) || \ | |
| defined(__ppc__) || defined(__PPC__) | |
| #define ABSL_ARCH_PPC | |
| #else | |
| // Unsupported architecture. | |
| // * https://sourceforge.net/p/predef/wiki/Architectures/ | |
| // * https://msdn.microsoft.com/en-us/library/b0084kay.aspx | |
| // * for gcc, clang: "echo | gcc -E -dM -" | |
| #endif | |
| // ----------------------------------------------------------------------------- | |
| // Attribute Checks | |
| // ----------------------------------------------------------------------------- | |
| // ABSL_RANDOM_INTERNAL_RESTRICT annotates whether pointers may be considered | |
| // to be unaliased. | |
| #if defined(__clang__) || defined(__GNUC__) | |
| #define ABSL_RANDOM_INTERNAL_RESTRICT __restrict__ | |
| #elif defined(_MSC_VER) | |
| #define ABSL_RANDOM_INTERNAL_RESTRICT __restrict | |
| #else | |
| #define ABSL_RANDOM_INTERNAL_RESTRICT | |
| #endif | |
| // ABSL_HAVE_ACCELERATED_AES indicates whether the currently active compiler | |
| // flags (e.g. -maes) allow using hardware accelerated AES instructions, which | |
| // implies us assuming that the target platform supports them. | |
| #define ABSL_HAVE_ACCELERATED_AES 0 | |
| #if defined(ABSL_ARCH_X86_64) | |
| #if defined(__AES__) || defined(__AVX__) | |
| #undef ABSL_HAVE_ACCELERATED_AES | |
| #define ABSL_HAVE_ACCELERATED_AES 1 | |
| #endif | |
| #elif defined(ABSL_ARCH_PPC) | |
| // Rely on VSX and CRYPTO extensions for vcipher on PowerPC. | |
| #if (defined(__VEC__) || defined(__ALTIVEC__)) && defined(__VSX__) && \ | |
| defined(__CRYPTO__) | |
| #undef ABSL_HAVE_ACCELERATED_AES | |
| #define ABSL_HAVE_ACCELERATED_AES 1 | |
| #endif | |
| #elif defined(ABSL_ARCH_ARM) || defined(ABSL_ARCH_AARCH64) | |
| // http://infocenter.arm.com/help/topic/com.arm.doc.ihi0053c/IHI0053C_acle_2_0.pdf | |
| // Rely on NEON+CRYPTO extensions for ARM. | |
| #if defined(__ARM_NEON) && defined(__ARM_FEATURE_CRYPTO) | |
| #undef ABSL_HAVE_ACCELERATED_AES | |
| #define ABSL_HAVE_ACCELERATED_AES 1 | |
| #endif | |
| #endif | |
| // ABSL_RANDOM_INTERNAL_AES_DISPATCH indicates whether the currently active | |
| // platform has, or should use run-time dispatch for selecting the | |
| // accelerated Randen implementation. | |
| #define ABSL_RANDOM_INTERNAL_AES_DISPATCH 0 | |
| // iOS does not support dispatch, even on x86, since applications | |
| // should be bundled as fat binaries, with a different build tailored for | |
| // each specific supported platform/architecture. | |
| #if (defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE) || \ | |
| (defined(TARGET_OS_IPHONE_SIMULATOR) && TARGET_OS_IPHONE_SIMULATOR) | |
| #undef ABSL_RANDOM_INTERNAL_AES_DISPATCH | |
| #define ABSL_RANDOM_INTERNAL_AES_DISPATCH 0 | |
| #elif defined(ABSL_ARCH_X86_64) | |
| // Dispatch is available on x86_64 | |
| #undef ABSL_RANDOM_INTERNAL_AES_DISPATCH | |
| #define ABSL_RANDOM_INTERNAL_AES_DISPATCH 1 | |
| #elif defined(__linux__) && defined(ABSL_ARCH_PPC) | |
| // Or when running linux PPC | |
| #undef ABSL_RANDOM_INTERNAL_AES_DISPATCH | |
| #define ABSL_RANDOM_INTERNAL_AES_DISPATCH 1 | |
| #elif (defined(__linux__) || defined(__APPLE__)) && defined(ABSL_ARCH_AARCH64) | |
| // Or when running linux or macOS AArch64 | |
| #undef ABSL_RANDOM_INTERNAL_AES_DISPATCH | |
| #define ABSL_RANDOM_INTERNAL_AES_DISPATCH 1 | |
| #elif defined(__linux__) && defined(ABSL_ARCH_ARM) && (__ARM_ARCH >= 8) | |
| // Or when running linux ARM v8 or higher. | |
| // (This captures a lot of Android configurations.) | |
| #undef ABSL_RANDOM_INTERNAL_AES_DISPATCH | |
| #define ABSL_RANDOM_INTERNAL_AES_DISPATCH 1 | |
| #endif | |
| #endif // ABSL_RANDOM_INTERNAL_PLATFORM_H_ |