mirror of https://gitee.com/bigwinds/arangodb
79 lines
2.3 KiB
C++
79 lines
2.3 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
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/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
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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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/// http://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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///
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/// Copyright holder is ArangoDB GmbH, Cologne, Germany
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///
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/// @author Dr. Frank Celler
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGODB_BASICS_SYSTEM__COMPILER_H
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#define ARANGODB_BASICS_SYSTEM__COMPILER_H 1
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#include "Basics/operating-system.h"
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// warn if return value is unused
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#if defined(__GNUC__) || defined(__GNUG__)
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#define ADB_WARN_UNUSED_RESULT __attribute__((warn_unused_result))
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#elif defined(__clang__)
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#define ADB_WARN_UNUSED_RESULT __attribute__((warn_unused_result))
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#else
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#define ADB_WARN_UNUSED_RESULT /* unused */
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#endif
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// suppress unused variable warning
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#if defined(__GNUC__)
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#define ADB_IGNORE_UNUSED __attribute__((unused))
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#else
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#define ADB_IGNORE_UNUSED /* unused */
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#endif
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// unreachable code marker
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#if defined(_MSC_VER)
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#define ADB_UNREACHABLE __assume(false)
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#elif defined(__GNUC__) || defined(__GNUG__)
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#define ADB_UNREACHABLE __builtin_unreachable()
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#elif defined(__clang__)
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#define ADB_UNREACHABLE __builtin_unreachable()
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#else
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#define ADB_UNREACHABLE \
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TRI_ASSERT(false); \
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std::abort()
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#endif
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// likely/unlikely branch indicator
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// macro definitions similar to the ones at
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// https://kernelnewbies.org/FAQ/LikelyUnlikely
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#if defined(__GNUC__) || defined(__GNUG__)
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#define ADB_LIKELY(v) __builtin_expect(!!(v), 1)
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#define ADB_UNLIKELY(v) __builtin_expect(!!(v), 0)
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#else
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#define ADB_LIKELY(v) v
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#define ADB_UNLIKELY(v) v
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#endif
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// sizetint_t
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#if defined(TRI_OVERLOAD_FUNCS_SIZE_T)
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#if TRI_SIZEOF_SIZE_T == 8
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#define sizetint_t uint64_t
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#else
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#define sizetint_t uint32_t
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#endif
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#endif
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#endif
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