fc8dc48020
git-subtree-dir: third_party/abseil_cpp git-subtree-mainline:ffb2ae54begit-subtree-split:768eb2ca28
171 lines
6.4 KiB
C
171 lines
6.4 KiB
C
// Copyright 2017 The Abseil Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef ABSL_RANDOM_INTERNAL_PLATFORM_H_
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#define ABSL_RANDOM_INTERNAL_PLATFORM_H_
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// HERMETIC NOTE: The randen_hwaes target must not introduce duplicate
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// symbols from arbitrary system and other headers, since it may be built
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// with different flags from other targets, using different levels of
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// optimization, potentially introducing ODR violations.
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// -----------------------------------------------------------------------------
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// Platform Feature Checks
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// -----------------------------------------------------------------------------
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// Currently supported operating systems and associated preprocessor
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// symbols:
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//
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// Linux and Linux-derived __linux__
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// Android __ANDROID__ (implies __linux__)
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// Linux (non-Android) __linux__ && !__ANDROID__
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// Darwin (macOS and iOS) __APPLE__
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// Akaros (http://akaros.org) __ros__
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// Windows _WIN32
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// NaCL __native_client__
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// AsmJS __asmjs__
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// WebAssembly __wasm__
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// Fuchsia __Fuchsia__
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//
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// Note that since Android defines both __ANDROID__ and __linux__, one
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// may probe for either Linux or Android by simply testing for __linux__.
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//
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// NOTE: For __APPLE__ platforms, we use #include <TargetConditionals.h>
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// to distinguish os variants.
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//
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// http://nadeausoftware.com/articles/2012/01/c_c_tip_how_use_compiler_predefined_macros_detect_operating_system
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#if defined(__APPLE__)
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#include <TargetConditionals.h>
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#endif
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// -----------------------------------------------------------------------------
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// Architecture Checks
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// -----------------------------------------------------------------------------
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// These preprocessor directives are trying to determine CPU architecture,
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// including necessary headers to support hardware AES.
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//
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// ABSL_ARCH_{X86/PPC/ARM} macros determine the platform.
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#if defined(__x86_64__) || defined(__x86_64) || defined(_M_AMD64) || \
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defined(_M_X64)
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#define ABSL_ARCH_X86_64
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#elif defined(__i386) || defined(_M_IX86)
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#define ABSL_ARCH_X86_32
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#elif defined(__aarch64__) || defined(__arm64__) || defined(_M_ARM64)
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#define ABSL_ARCH_AARCH64
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#elif defined(__arm__) || defined(__ARMEL__) || defined(_M_ARM)
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#define ABSL_ARCH_ARM
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#elif defined(__powerpc64__) || defined(__PPC64__) || defined(__powerpc__) || \
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defined(__ppc__) || defined(__PPC__)
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#define ABSL_ARCH_PPC
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#else
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// Unsupported architecture.
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// * https://sourceforge.net/p/predef/wiki/Architectures/
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// * https://msdn.microsoft.com/en-us/library/b0084kay.aspx
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// * for gcc, clang: "echo | gcc -E -dM -"
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#endif
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// -----------------------------------------------------------------------------
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// Attribute Checks
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// -----------------------------------------------------------------------------
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// ABSL_RANDOM_INTERNAL_RESTRICT annotates whether pointers may be considered
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// to be unaliased.
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#if defined(__clang__) || defined(__GNUC__)
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#define ABSL_RANDOM_INTERNAL_RESTRICT __restrict__
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#elif defined(_MSC_VER)
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#define ABSL_RANDOM_INTERNAL_RESTRICT __restrict
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#else
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#define ABSL_RANDOM_INTERNAL_RESTRICT
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#endif
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// ABSL_HAVE_ACCELERATED_AES indicates whether the currently active compiler
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// flags (e.g. -maes) allow using hardware accelerated AES instructions, which
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// implies us assuming that the target platform supports them.
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#define ABSL_HAVE_ACCELERATED_AES 0
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#if defined(ABSL_ARCH_X86_64)
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#if defined(__AES__) || defined(__AVX__)
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#undef ABSL_HAVE_ACCELERATED_AES
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#define ABSL_HAVE_ACCELERATED_AES 1
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#endif
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#elif defined(ABSL_ARCH_PPC)
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// Rely on VSX and CRYPTO extensions for vcipher on PowerPC.
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#if (defined(__VEC__) || defined(__ALTIVEC__)) && defined(__VSX__) && \
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defined(__CRYPTO__)
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#undef ABSL_HAVE_ACCELERATED_AES
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#define ABSL_HAVE_ACCELERATED_AES 1
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#endif
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#elif defined(ABSL_ARCH_ARM) || defined(ABSL_ARCH_AARCH64)
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// http://infocenter.arm.com/help/topic/com.arm.doc.ihi0053c/IHI0053C_acle_2_0.pdf
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// Rely on NEON+CRYPTO extensions for ARM.
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#if defined(__ARM_NEON) && defined(__ARM_FEATURE_CRYPTO)
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#undef ABSL_HAVE_ACCELERATED_AES
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#define ABSL_HAVE_ACCELERATED_AES 1
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#endif
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#endif
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// NaCl does not allow AES.
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#if defined(__native_client__)
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#undef ABSL_HAVE_ACCELERATED_AES
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#define ABSL_HAVE_ACCELERATED_AES 0
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#endif
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// ABSL_RANDOM_INTERNAL_AES_DISPATCH indicates whether the currently active
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// platform has, or should use run-time dispatch for selecting the
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// acclerated Randen implementation.
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#define ABSL_RANDOM_INTERNAL_AES_DISPATCH 0
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#if defined(ABSL_ARCH_X86_64)
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// Dispatch is available on x86_64
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#undef ABSL_RANDOM_INTERNAL_AES_DISPATCH
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#define ABSL_RANDOM_INTERNAL_AES_DISPATCH 1
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#elif defined(__linux__) && defined(ABSL_ARCH_PPC)
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// Or when running linux PPC
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#undef ABSL_RANDOM_INTERNAL_AES_DISPATCH
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#define ABSL_RANDOM_INTERNAL_AES_DISPATCH 1
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#elif defined(__linux__) && defined(ABSL_ARCH_AARCH64)
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// Or when running linux AArch64
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#undef ABSL_RANDOM_INTERNAL_AES_DISPATCH
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#define ABSL_RANDOM_INTERNAL_AES_DISPATCH 1
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#elif defined(__linux__) && defined(ABSL_ARCH_ARM) && (__ARM_ARCH >= 8)
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// Or when running linux ARM v8 or higher.
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// (This captures a lot of Android configurations.)
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#undef ABSL_RANDOM_INTERNAL_AES_DISPATCH
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#define ABSL_RANDOM_INTERNAL_AES_DISPATCH 1
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#endif
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// NaCl does not allow dispatch.
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#if defined(__native_client__)
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#undef ABSL_RANDOM_INTERNAL_AES_DISPATCH
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#define ABSL_RANDOM_INTERNAL_AES_DISPATCH 0
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#endif
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// iOS does not support dispatch, even on x86, since applications
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// should be bundled as fat binaries, with a different build tailored for
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// each specific supported platform/architecture.
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#if (defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE) || \
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(defined(TARGET_OS_IPHONE_SIMULATOR) && TARGET_OS_IPHONE_SIMULATOR)
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#undef ABSL_RANDOM_INTERNAL_AES_DISPATCH
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#define ABSL_RANDOM_INTERNAL_AES_DISPATCH 0
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#endif
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#endif // ABSL_RANDOM_INTERNAL_PLATFORM_H_
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