179 lines
5.0 KiB
C++
179 lines
5.0 KiB
C++
#ifndef MY_COMPILER_INCLUDED
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#define MY_COMPILER_INCLUDED
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/* Copyright (c) 2010, 2016, 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 as published by
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the Free Software Foundation; version 2 of the License.
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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 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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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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#include <stddef.h> /* size_t */
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#if defined __GNUC__
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/*
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Convenience macro to test the minimum required GCC version.
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These should be used with care as Clang also sets __GNUC__ and
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__GNUC_MINOR__ (currently to 4.2). Prefer using feature specific
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CMake checks in configure.cmake instead.
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*/
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# define MY_GNUC_PREREQ(maj, min) \
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((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
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# define GCC_VERSION (__GNUC__ * 1000 + __GNUC_MINOR__)
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#else
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# define MY_GNUC_PREREQ(maj, min) (0)
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#endif
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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)
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{
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return __builtin_expect(expr, true);
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}
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inline bool unlikely(bool expr)
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{
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return __builtin_expect(expr, false);
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}
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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)
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{
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return expr;
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}
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inline bool unlikely(bool expr)
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{
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return expr;
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}
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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() do { assert(0); } while (0)
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#endif
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#if defined __GNUC__ || defined __SUNPRO_C || defined __SUNPRO_CC
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/* Specifies the minimum alignment of a type. */
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# define MY_ALIGNOF(type) __alignof__(type)
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/* Determine the alignment requirement of a type. */
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# define MY_ALIGNED(n) __attribute__((__aligned__((n))))
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/* Microsoft Visual C++ */
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#elif defined _MSC_VER
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# define MY_ALIGNOF(type) __alignof(type)
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# define MY_ALIGNED(n) __declspec(align(n))
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#else /* Make sure they are defined for other compilers. */
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# define MY_ALIGNOF(type)
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# define MY_ALIGNED(size)
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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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C++ Type Traits
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*/
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#ifdef __cplusplus
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/**
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Opaque storage with a particular alignment.
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Partial specialization used due to MSVC++.
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*/
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template<size_t alignment> struct my_alignment_imp;
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template<> struct MY_ALIGNED(1) my_alignment_imp<1> {};
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template<> struct MY_ALIGNED(2) my_alignment_imp<2> {};
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template<> struct MY_ALIGNED(4) my_alignment_imp<4> {};
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template<> struct MY_ALIGNED(8) my_alignment_imp<8> {};
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template<> struct MY_ALIGNED(16) my_alignment_imp<16> {};
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/**
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A POD type with a given size and alignment.
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@remark If the compiler does not support a alignment attribute
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(MY_ALIGN macro), the default alignment of a double is
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used instead.
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@tparam size The minimum size.
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@tparam alignment The desired alignment: 1, 2, 4, 8 or 16.
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*/
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template <size_t size, size_t alignment>
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struct my_aligned_storage
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{
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union
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{
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char data[size];
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my_alignment_imp<alignment> align;
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};
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};
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#endif /* __cplusplus */
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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__)
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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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#ifndef __has_attribute
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# define __has_attribute(x) 0
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#endif
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#if __has_attribute(no_sanitize_undefined)
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# define SUPPRESS_UBSAN __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 /* MY_COMPILER_INCLUDED */
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