159 lines
4.4 KiB
C
159 lines
4.4 KiB
C
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/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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* All rights reserved.
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*
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* This source code is licensed under both the BSD-style license (found in the
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* LICENSE file in the root directory of this source tree) and the GPLv2 (found
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* in the COPYING file in the root directory of this source tree).
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* You may select, at your option, one of the above-listed licenses.
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*/
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#ifndef ZSTD_PORTABILITY_MACROS_H
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#define ZSTD_PORTABILITY_MACROS_H
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/**
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* This header file contains macro definitions to support portability.
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* This header is shared between C and ASM code, so it MUST only
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* contain macro definitions. It MUST not contain any C code.
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*
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* This header ONLY defines macros to detect platforms/feature support.
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*
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*/
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/* compat. with non-clang compilers */
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#ifndef __has_attribute
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#define __has_attribute(x) 0
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#endif
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/* compat. with non-clang compilers */
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#ifndef __has_builtin
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# define __has_builtin(x) 0
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#endif
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/* compat. with non-clang compilers */
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#ifndef __has_feature
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# define __has_feature(x) 0
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#endif
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/* detects whether we are being compiled under msan */
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#ifndef ZSTD_MEMORY_SANITIZER
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# if __has_feature(memory_sanitizer)
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# define ZSTD_MEMORY_SANITIZER 1
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# else
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# define ZSTD_MEMORY_SANITIZER 0
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# endif
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#endif
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/* detects whether we are being compiled under asan */
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#ifndef ZSTD_ADDRESS_SANITIZER
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# if __has_feature(address_sanitizer)
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# define ZSTD_ADDRESS_SANITIZER 1
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# elif defined(__SANITIZE_ADDRESS__)
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# define ZSTD_ADDRESS_SANITIZER 1
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# else
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# define ZSTD_ADDRESS_SANITIZER 0
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# endif
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#endif
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/* detects whether we are being compiled under dfsan */
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#ifndef ZSTD_DATAFLOW_SANITIZER
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# if __has_feature(dataflow_sanitizer)
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# define ZSTD_DATAFLOW_SANITIZER 1
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# else
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# define ZSTD_DATAFLOW_SANITIZER 0
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# endif
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#endif
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/* Mark the internal assembly functions as hidden */
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#ifdef __ELF__
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# define ZSTD_HIDE_ASM_FUNCTION(func) .hidden func
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#elif defined(__APPLE__)
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# define ZSTD_HIDE_ASM_FUNCTION(func) .private_extern func
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#else
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# define ZSTD_HIDE_ASM_FUNCTION(func)
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#endif
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/* Enable runtime BMI2 dispatch based on the CPU.
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* Enabled for clang & gcc >=4.8 on x86 when BMI2 isn't enabled by default.
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*/
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#ifndef DYNAMIC_BMI2
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#if ((defined(__clang__) && __has_attribute(__target__)) \
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|| (defined(__GNUC__) \
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&& (__GNUC__ >= 5 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)))) \
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&& (defined(__x86_64__) || defined(_M_X64)) \
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&& !defined(__BMI2__)
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# define DYNAMIC_BMI2 1
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#else
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# define DYNAMIC_BMI2 0
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#endif
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#endif
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/**
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* Only enable assembly for GNUC compatible compilers,
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* because other platforms may not support GAS assembly syntax.
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*
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* Only enable assembly for Linux / MacOS, other platforms may
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* work, but they haven't been tested. This could likely be
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* extended to BSD systems.
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*
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* Disable assembly when MSAN is enabled, because MSAN requires
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* 100% of code to be instrumented to work.
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*/
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#if defined(__GNUC__)
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# if defined(__linux__) || defined(__linux) || defined(__APPLE__)
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# if ZSTD_MEMORY_SANITIZER
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# define ZSTD_ASM_SUPPORTED 0
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# elif ZSTD_DATAFLOW_SANITIZER
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# define ZSTD_ASM_SUPPORTED 0
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# else
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# define ZSTD_ASM_SUPPORTED 1
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# endif
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# else
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# define ZSTD_ASM_SUPPORTED 0
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# endif
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#else
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# define ZSTD_ASM_SUPPORTED 0
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#endif
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/**
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* Determines whether we should enable assembly for x86-64
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* with BMI2.
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*
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* Enable if all of the following conditions hold:
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* - ASM hasn't been explicitly disabled by defining ZSTD_DISABLE_ASM
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* - Assembly is supported
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* - We are compiling for x86-64 and either:
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* - DYNAMIC_BMI2 is enabled
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* - BMI2 is supported at compile time
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*/
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#if !defined(ZSTD_DISABLE_ASM) && \
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ZSTD_ASM_SUPPORTED && \
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defined(__x86_64__) && \
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(DYNAMIC_BMI2 || defined(__BMI2__))
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# define ZSTD_ENABLE_ASM_X86_64_BMI2 1
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#else
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# define ZSTD_ENABLE_ASM_X86_64_BMI2 0
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#endif
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/*
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* For x86 ELF targets, add .note.gnu.property section for Intel CET in
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* assembly sources when CET is enabled.
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*
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* Additionally, any function that may be called indirectly must begin
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* with ZSTD_CET_ENDBRANCH.
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*/
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#if defined(__ELF__) && (defined(__x86_64__) || defined(__i386__)) \
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&& defined(__has_include)
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# if __has_include(<cet.h>)
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# include <cet.h>
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# define ZSTD_CET_ENDBRANCH _CET_ENDBR
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# endif
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#endif
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#ifndef ZSTD_CET_ENDBRANCH
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# define ZSTD_CET_ENDBRANCH
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#endif
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#endif /* ZSTD_PORTABILITY_MACROS_H */
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