| // 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. |
| |
| #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 |
| // NaCL __native_client__ |
| // 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 |
| |
| // NaCl does not allow AES. |
| #if defined(__native_client__) |
| #undef ABSL_HAVE_ACCELERATED_AES |
| #define ABSL_HAVE_ACCELERATED_AES 0 |
| #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 |
| |
| #if 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(ABSL_ARCH_AARCH64) |
| // Or when running linux 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 |
| |
| // NaCl does not allow dispatch. |
| #if defined(__native_client__) |
| #undef ABSL_RANDOM_INTERNAL_AES_DISPATCH |
| #define ABSL_RANDOM_INTERNAL_AES_DISPATCH 0 |
| #endif |
| |
| // 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 |
| #endif |
| |
| #endif // ABSL_RANDOM_INTERNAL_PLATFORM_H_ |
