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#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 as published by
the Free Software Foundation; version 2 of the License.
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 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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