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150 lines
4.5 KiB
150 lines
4.5 KiB
#ifndef MY_COMPILER_INCLUDED
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#define MY_COMPILER_INCLUDED
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/* Copyright (c) 2010, 2019, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License, version 2.0, for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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/**
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@file include/my_compiler.h
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Header for compiler-dependent features.
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Intended to contain a set of reusable wrappers for preprocessor
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macros, attributes, pragmas, and any other features that are
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specific to a target compiler.
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*/
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#ifndef MYSQL_ABI_CHECK
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#include <assert.h>
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#include <stddef.h> /* size_t */
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#endif
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#include "my_config.h"
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/*
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The macros below are borrowed from include/linux/compiler.h in the
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Linux kernel. Use them to indicate the likelyhood of the truthfulness
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of a condition. This serves two purposes - newer versions of gcc will be
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able to optimize for branch predication, which could yield siginficant
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performance gains in frequently executed sections of the code, and the
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other reason to use them is for documentation
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*/
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#ifdef HAVE_BUILTIN_EXPECT
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// likely/unlikely are likely to clash with other symbols, do not #define
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#if defined(__cplusplus)
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inline bool likely(bool expr) { return __builtin_expect(expr, true); }
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inline bool unlikely(bool expr) { return __builtin_expect(expr, false); }
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#else
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#define likely(x) __builtin_expect((x), 1)
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#define unlikely(x) __builtin_expect((x), 0)
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#endif
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#else /* HAVE_BUILTIN_EXPECT */
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#if defined(__cplusplus)
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inline bool likely(bool expr) { return expr; }
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inline bool unlikely(bool expr) { return expr; }
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#else
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#define likely(x) (x)
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#define unlikely(x) (x)
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#endif
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#endif /* HAVE_BUILTIN_EXPECT */
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/* Comunicate to the compiler the unreachability of the code. */
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#ifdef HAVE_BUILTIN_UNREACHABLE
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#define MY_ASSERT_UNREACHABLE() __builtin_unreachable()
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#else
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#define MY_ASSERT_UNREACHABLE() \
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do { \
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assert(0); \
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} while (0)
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#endif
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/* Visual Studio requires '__inline' for C code */
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#if !defined(__cplusplus) && defined(_MSC_VER)
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#define inline __inline
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#endif
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/* Provide __func__ macro definition for Visual Studio. */
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#if defined(_MSC_VER)
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#define __func__ __FUNCTION__
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#endif
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/*
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Disable MY_ATTRIBUTE for Sun Studio and Visual Studio.
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Note that Sun Studio supports some __attribute__ variants,
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but not format or unused which we use quite a lot.
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*/
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#ifndef MY_ATTRIBUTE
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#if defined(__GNUC__) || defined(__clang__)
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#define MY_ATTRIBUTE(A) __attribute__(A)
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#else
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#define MY_ATTRIBUTE(A)
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#endif
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#endif
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#if defined(_MSC_VER)
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#define ALWAYS_INLINE __forceinline
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#else
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#define ALWAYS_INLINE __attribute__((always_inline)) inline
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#endif
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#if defined(_MSC_VER)
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#define NO_INLINE __declspec(noinline)
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#else
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#define NO_INLINE __attribute__((noinline))
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#endif
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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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#ifndef SUPPRESS_UBSAN
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// clang -fsanitize=undefined
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#if defined(HAVE_UBSAN) && defined(__clang__)
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#define SUPPRESS_UBSAN MY_ATTRIBUTE((no_sanitize("undefined")))
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// gcc -fsanitize=undefined
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#elif defined(HAVE_UBSAN) && __has_attribute(no_sanitize_undefined)
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#define SUPPRESS_UBSAN MY_ATTRIBUTE((no_sanitize_undefined))
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#else
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#define SUPPRESS_UBSAN
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#endif
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#endif /* SUPPRESS_UBSAN */
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#ifndef SUPPRESS_TSAN
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#if defined(HAVE_TSAN) && defined(__clang__)
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#define SUPPRESS_TSAN MY_ATTRIBUTE((no_sanitize("thread")))
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#elif defined(HAVE_TSAN) && __has_attribute(no_sanitize_thread)
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#define SUPPRESS_TSAN MY_ATTRIBUTE((no_sanitize_thread))
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#else
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#define SUPPRESS_TSAN
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#endif
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#endif /* SUPPRESS_TSAN */
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#ifdef _WIN32
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#define STDCALL __stdcall
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#else
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#define STDCALL
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#endif
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#endif /* MY_COMPILER_INCLUDED */
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