Current File : //proc/self/root/usr/include/mysql/my_compiler.h
#ifndef MY_COMPILER_INCLUDED
#define MY_COMPILER_INCLUDED
/* Copyright (c) 2010, 2011, Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.
This program is also distributed with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation. The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have included with MySQL.
Without limiting anything contained in the foregoing, this file,
which is part of C Driver for MySQL (Connector/C), is also subject to the
Universal FOSS Exception, version 1.0, a copy of which can be found at
http://oss.oracle.com/licenses/universal-foss-exception.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License, version 2.0, for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
/**
Header for compiler-dependent features.
Intended to contain a set of reusable wrappers for preprocessor
macros, attributes, pragmas, and any other features that are
specific to a target compiler.
*/
#include <my_global.h> /* stddef.h offsetof */
/**
Compiler-dependent internal convenience macros.
*/
/* GNU C/C++ */
#if defined __GNUC__
/* Convenience macro to test the minimum required GCC version. */
# define MY_GNUC_PREREQ(maj, min) \
((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
/* Any after 2.95... */
# define MY_ALIGN_EXT
/* Comunicate to the compiler the unreachability of the code. */
# if MY_GNUC_PREREQ(4,5)
# define MY_ASSERT_UNREACHABLE() __builtin_unreachable()
# endif
/* Microsoft Visual C++ */
#elif defined _MSC_VER
# define MY_ALIGNOF(type) __alignof(type)
# define MY_ALIGNED(n) __declspec(align(n))
/* Oracle Solaris Studio */
#elif defined(__SUNPRO_C) || defined(__SUNPRO_CC)
# if __SUNPRO_C >= 0x590
# define MY_ALIGN_EXT
# endif
/* IBM XL C/C++ */
#elif defined __xlC__
# if __xlC__ >= 0x0600
# define MY_ALIGN_EXT
# endif
/* HP aCC */
#elif defined(__HP_aCC) || defined(__HP_cc)
# if (__HP_aCC >= 60000) || (__HP_cc >= 60000)
# define MY_ALIGN_EXT
# endif
#endif
#ifdef MY_ALIGN_EXT
/** Specifies the minimum alignment of a type. */
# define MY_ALIGNOF(type) __alignof__(type)
/** Determine the alignment requirement of a type. */
# define MY_ALIGNED(n) __attribute__((__aligned__((n))))
#endif
/**
Generic (compiler-independent) features.
*/
#ifndef MY_GNUC_PREREQ
# define MY_GNUC_PREREQ(maj, min) (0)
#endif
#ifndef MY_ALIGNOF
# ifdef __cplusplus
template<typename type> struct my_alignof_helper { char m1; type m2; };
/* Invalid for non-POD types, but most compilers give the right answer. */
# define MY_ALIGNOF(type) offsetof(my_alignof_helper<type>, m2)
# else
# define MY_ALIGNOF(type) offsetof(struct { char m1; type m2; }, m2)
# endif
#endif
#ifndef MY_ASSERT_UNREACHABLE
# define MY_ASSERT_UNREACHABLE() do { assert(0); } while (0)
#endif
/**
C++ Type Traits
*/
#ifdef __cplusplus
/**
Opaque storage with a particular alignment.
*/
# if defined(MY_ALIGNED)
/* Partial specialization used due to MSVC++. */
template<size_t alignment> struct my_alignment_imp;
template<> struct MY_ALIGNED(1) my_alignment_imp<1> {};
template<> struct MY_ALIGNED(2) my_alignment_imp<2> {};
template<> struct MY_ALIGNED(4) my_alignment_imp<4> {};
template<> struct MY_ALIGNED(8) my_alignment_imp<8> {};
template<> struct MY_ALIGNED(16) my_alignment_imp<16> {};
/* ... expand as necessary. */
# else
template<size_t alignment>
struct my_alignment_imp { double m1; };
# endif
/**
A POD type with a given size and alignment.
@remark If the compiler does not support a alignment attribute
(MY_ALIGN macro), the default alignment of a double is
used instead.
@tparam size The minimum size.
@tparam alignment The desired alignment: 1, 2, 4, 8 or 16.
*/
template <size_t size, size_t alignment>
struct my_aligned_storage
{
union
{
char data[size];
my_alignment_imp<alignment> align;
};
};
#endif /* __cplusplus */
# ifndef MY_ALIGNED
/*
Make sure MY_ALIGNED can be used also on platforms where we don't
have a way of aligning data structures.
*/
#define MY_ALIGNED(size)
#endif
#include <my_attribute.h>
#endif /* MY_COMPILER_INCLUDED */
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