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compiler_attributes.h


products/Sources/formale Sprachen/C/Firefox/media/libvpx/libvpx/vpx_ports/compiler_attributes.h

/* * Copyright (c) 2020 The WebM project authors. All Rights Reserved. * * Use of this source code is governed by a BSD-style license * that can be found in the LICENSE file in the root of the source * tree. An additional intellectual property rights grant can be found * in the file PATENTS. All contributing project authors may * be found in the AUTHORS file in the root of the source tree. */ #ifndef VPX_VPX_PORTS_COMPILER_ATTRIBUTES_H_ #define VPX_VPX_PORTS_COMPILER_ATTRIBUTES_H_ #if !defined(__has_feature) #define __has_feature(x) 0 #endif // !defined(__has_feature) #if !defined(__has_attribute) #define __has_attribute(x) 0 #endif // !defined(__has_attribute) //------------------------------------------------------------------------------ // Sanitizer attributes. #if __has_feature(address_sanitizer) || defined(__SANITIZE_ADDRESS__) #define VPX_WITH_ASAN 1 #else #define VPX_WITH_ASAN 0 #endif // __has_feature(address_sanitizer) || defined(__SANITIZE_ADDRESS__) #if defined(__clang__) && __has_attribute(no_sanitize) // Both of these have defined behavior and are used in certain operations or // optimizations thereof. There are cases where an overflow may be unintended, // however, so use of these attributes should be done with care. #define VPX_NO_UNSIGNED_OVERFLOW_CHECK \ __attribute__((no_sanitize("unsigned-integer-overflow"))) #if __clang_major__ >= 12 #define VPX_NO_UNSIGNED_SHIFT_CHECK \ __attribute__((no_sanitize("unsigned-shift-base"))) #endif // __clang__ >= 12 #endif // __clang__ #ifndef VPX_NO_UNSIGNED_OVERFLOW_CHECK #define VPX_NO_UNSIGNED_OVERFLOW_CHECK #endif #ifndef VPX_NO_UNSIGNED_SHIFT_CHECK #define VPX_NO_UNSIGNED_SHIFT_CHECK #endif //------------------------------------------------------------------------------ // Variable attributes. #if __has_attribute(uninitialized) // Attribute "uninitialized" disables -ftrivial-auto-var-init=pattern for // the specified variable. // // -ftrivial-auto-var-init is security risk mitigation feature, so attribute // should not be used "just in case", but only to fix real performance // bottlenecks when other approaches do not work. In general the compiler is // quite effective at eliminating unneeded initializations introduced by the // flag, e.g. when they are followed by actual initialization by a program. // However if compiler optimization fails and code refactoring is hard, the // attribute can be used as a workaround. #define VPX_UNINITIALIZED __attribute__((uninitialized)) #else #define VPX_UNINITIALIZED #endif // __has_attribute(uninitialized) #endif // VPX_VPX_PORTS_COMPILER_ATTRIBUTES_H_

                                                                                                                                                                                                                                                                                                                                                                                                     

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