2f6a770ccf
The clang/gcc implementation uses the nonstandard __builtin_expect(). In C++20, new standard attributes can be used instead. We can't use those yet though. Change-Id: Idd2541a7eca0d97ac6c643abbf2910cbc343d7e5 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/34816 Reviewed-by: Jason Lowe-Power <power.jg@gmail.com> Maintainer: Jason Lowe-Power <power.jg@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com>
116 lines
4.2 KiB
C++
116 lines
4.2 KiB
C++
/*
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* Copyright (c) 2012,2017-2018 ARM Limited
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* All rights reserved
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*
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* The license below extends only to copyright in the software and shall
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* not be construed as granting a license to any other intellectual
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* property including but not limited to intellectual property relating
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* to a hardware implementation of the functionality of the software
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* licensed hereunder. You may use the software subject to the license
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* terms below provided that you ensure that this notice is replicated
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* unmodified and in its entirety in all distributions of the software,
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* modified or unmodified, in source code or in binary form.
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*
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* Copyright (c) 2006 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __BASE_COMPILER_HH__
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#define __BASE_COMPILER_HH__
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#include <memory>
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// http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html
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#if defined(__GNUC__) // clang or gcc
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# define M5_ATTR_NORETURN __attribute__((noreturn))
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# define M5_DUMMY_RETURN
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# define M5_VAR_USED __attribute__((unused))
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# define M5_ATTR_PACKED __attribute__ ((__packed__))
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# define M5_NO_INLINE __attribute__ ((__noinline__))
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# define M5_DEPRECATED __attribute__((deprecated))
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# define M5_DEPRECATED_MSG(MSG) __attribute__((deprecated(MSG)))
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# define M5_UNREACHABLE __builtin_unreachable()
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# define M5_PUBLIC __attribute__ ((visibility ("default")))
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# define M5_LOCAL __attribute__ ((visibility ("hidden")))
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# define M5_LIKELY(cond) __builtin_expect(!!(cond), 1)
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# define M5_UNLIKELY(cond) __builtin_expect(!!(cond), 0)
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#endif
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#if defined(__clang__)
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# define M5_CLASS_VAR_USED M5_VAR_USED
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#else
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# define M5_CLASS_VAR_USED
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#endif
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// This can be removed once all compilers support C++17
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#if defined __has_cpp_attribute
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// Note: We must separate this if statement because GCC < 5.0 doesn't
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// support the function-like syntax in #if statements.
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#if __has_cpp_attribute(fallthrough)
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#define M5_FALLTHROUGH [[fallthrough]]
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#else
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#define M5_FALLTHROUGH
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#endif
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#if __has_cpp_attribute(nodiscard)
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#define M5_NODISCARD [[nodiscard]]
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#else
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#define M5_NODISCARD
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#endif
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#else
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// Unsupported (and no warning) on GCC < 7.
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#define M5_FALLTHROUGH
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#define M5_NODISCARD
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#endif
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// std::make_unique redefined for C++11 compilers
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namespace m5
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{
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#if __cplusplus >= 201402L // C++14
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using std::make_unique;
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#else // C++11
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/** Defining custom version of make_unique: m5::make_unique<>() */
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template<typename T, typename... Args>
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std::unique_ptr<T>
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make_unique( Args&&... constructor_args )
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{
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return std::unique_ptr<T>(
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new T( std::forward<Args>(constructor_args)... )
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);
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}
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#endif // __cplusplus >= 201402L
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} //namespace m5
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#endif // __BASE_COMPILER_HH__
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