[857] | 1 | // (C) Copyright John Maddock 2000.
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| 2 | // Use, modification and distribution are subject to the Boost Software License,
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| 3 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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| 4 | // http://www.boost.org/LICENSE_1_0.txt).
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| 5 | //
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| 6 | // See http://www.boost.org/libs/type_traits for most recent version including documentation.
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| 7 |
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| 8 | #ifndef BOOST_TT_TYPE_WITH_ALIGNMENT_INCLUDED
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| 9 | #define BOOST_TT_TYPE_WITH_ALIGNMENT_INCLUDED
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| 10 |
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| 11 | #include "boost/mpl/if.hpp"
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| 12 | #include "boost/preprocessor/list/for_each_i.hpp"
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| 13 | #include "boost/preprocessor/tuple/to_list.hpp"
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| 14 | #include "boost/preprocessor/cat.hpp"
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| 15 | #include "boost/preprocessor/list/transform.hpp"
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| 16 | #include "boost/preprocessor/list/append.hpp"
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| 17 | #include "boost/type_traits/alignment_of.hpp"
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| 18 | #include "boost/type_traits/is_pod.hpp"
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| 19 | #include "boost/static_assert.hpp"
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| 20 | #include "boost/config.hpp"
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| 21 |
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| 22 | // should be the last #include
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| 23 | #include "boost/type_traits/detail/bool_trait_def.hpp"
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| 24 |
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| 25 | #include <cstddef>
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| 26 |
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| 27 | #ifdef BOOST_MSVC
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| 28 | # pragma warning(push)
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| 29 | # pragma warning(disable: 4121) // alignment is sensitive to packing
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| 30 | #endif
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| 31 |
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| 32 | namespace boost {
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| 33 |
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| 34 | #ifndef __BORLANDC__
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| 35 |
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| 36 | namespace detail {
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| 37 |
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| 38 | class alignment_dummy;
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| 39 | typedef void (*function_ptr)();
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| 40 | typedef int (alignment_dummy::*member_ptr);
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| 41 | typedef int (alignment_dummy::*member_function_ptr)();
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| 42 |
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| 43 | #ifdef BOOST_HAS_LONG_LONG
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| 44 | #define BOOST_TT_ALIGNMENT_BASE_TYPES BOOST_PP_TUPLE_TO_LIST( \
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| 45 | 12, ( \
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| 46 | char, short, int, long, ::boost::long_long_type, float, double, long double \
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| 47 | , void*, function_ptr, member_ptr, member_function_ptr))
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| 48 | #else
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| 49 | #define BOOST_TT_ALIGNMENT_BASE_TYPES BOOST_PP_TUPLE_TO_LIST( \
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| 50 | 11, ( \
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| 51 | char, short, int, long, float, double, long double \
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| 52 | , void*, function_ptr, member_ptr, member_function_ptr))
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| 53 | #endif
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| 54 |
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| 55 | #define BOOST_TT_HAS_ONE_T(D,Data,T) boost::detail::has_one_T< T >
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| 56 |
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| 57 | #define BOOST_TT_ALIGNMENT_STRUCT_TYPES \
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| 58 | BOOST_PP_LIST_TRANSFORM(BOOST_TT_HAS_ONE_T, \
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| 59 | X, \
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| 60 | BOOST_TT_ALIGNMENT_BASE_TYPES)
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| 61 |
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| 62 | #define BOOST_TT_ALIGNMENT_TYPES \
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| 63 | BOOST_PP_LIST_APPEND(BOOST_TT_ALIGNMENT_BASE_TYPES, \
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| 64 | BOOST_TT_ALIGNMENT_STRUCT_TYPES)
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| 65 |
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| 66 | //
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| 67 | // lower_alignment_helper --
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| 68 | //
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| 69 | // This template gets instantiated a lot, so use partial
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| 70 | // specialization when available to reduce the compiler burden.
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| 71 | //
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| 72 | #ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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| 73 | template <bool found = true>
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| 74 | struct lower_alignment_helper_impl
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| 75 | {
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| 76 | template <std::size_t, class>
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| 77 | struct apply
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| 78 | {
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| 79 | typedef char type;
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| 80 | enum { value = true };
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| 81 | };
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| 82 | };
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| 83 |
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| 84 | template <>
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| 85 | struct lower_alignment_helper_impl<false>
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| 86 | {
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| 87 | template <std::size_t target, class TestType>
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| 88 | struct apply
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| 89 | : mpl::if_c<(alignment_of<TestType>::value == target), TestType, char>
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| 90 | {
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| 91 | enum { value = (alignment_of<TestType>::value == target) };
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| 92 | };
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| 93 | };
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| 94 |
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| 95 | template <bool found, std::size_t target, class TestType>
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| 96 | struct lower_alignment_helper
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| 97 | : lower_alignment_helper_impl<found>::template apply<target,TestType>
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| 98 | {
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| 99 | };
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| 100 | #else
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| 101 | template <bool found, std::size_t target, class TestType>
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| 102 | struct lower_alignment_helper
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| 103 | {
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| 104 | typedef char type;
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| 105 | enum { value = true };
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| 106 | };
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| 107 |
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| 108 | template <std::size_t target, class TestType>
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| 109 | struct lower_alignment_helper<false,target,TestType>
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| 110 | {
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| 111 | enum { value = (alignment_of<TestType>::value == target) };
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| 112 | typedef typename mpl::if_c<value, TestType, char>::type type;
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| 113 | };
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| 114 | #endif
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| 115 |
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| 116 | #define BOOST_TT_CHOOSE_MIN_ALIGNMENT(R,P,I,T) \
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| 117 | typename lower_alignment_helper< \
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| 118 | BOOST_PP_CAT(found,I),target,T \
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| 119 | >::type BOOST_PP_CAT(t,I); \
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| 120 | enum { \
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| 121 | BOOST_PP_CAT(found,BOOST_PP_INC(I)) \
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| 122 | = lower_alignment_helper<BOOST_PP_CAT(found,I),target,T >::value \
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| 123 | };
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| 124 |
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| 125 | #define BOOST_TT_CHOOSE_T(R,P,I,T) T BOOST_PP_CAT(t,I);
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| 126 |
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| 127 | template <typename T>
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| 128 | struct has_one_T
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| 129 | {
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| 130 | T data;
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| 131 | };
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| 132 |
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| 133 | template <std::size_t target>
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| 134 | union lower_alignment
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| 135 | {
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| 136 | enum { found0 = false };
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| 137 |
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| 138 | BOOST_PP_LIST_FOR_EACH_I(
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| 139 | BOOST_TT_CHOOSE_MIN_ALIGNMENT
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| 140 | , ignored
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| 141 | , BOOST_TT_ALIGNMENT_TYPES
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| 142 | )
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| 143 | };
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| 144 |
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| 145 | union max_align
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| 146 | {
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| 147 | BOOST_PP_LIST_FOR_EACH_I(
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| 148 | BOOST_TT_CHOOSE_T
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| 149 | , ignored
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| 150 | , BOOST_TT_ALIGNMENT_TYPES
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| 151 | )
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| 152 | };
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| 153 |
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| 154 | #undef BOOST_TT_ALIGNMENT_BASE_TYPES
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| 155 | #undef BOOST_TT_HAS_ONE_T
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| 156 | #undef BOOST_TT_ALIGNMENT_STRUCT_TYPES
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| 157 | #undef BOOST_TT_ALIGNMENT_TYPES
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| 158 | #undef BOOST_TT_CHOOSE_MIN_ALIGNMENT
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| 159 | #undef BOOST_TT_CHOOSE_T
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| 160 |
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| 161 | template<std::size_t TAlign, std::size_t Align>
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| 162 | struct is_aligned
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| 163 | {
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| 164 | BOOST_STATIC_CONSTANT(bool,
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| 165 | value = (TAlign >= Align) & (TAlign % Align == 0)
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| 166 | );
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| 167 | };
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| 168 |
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| 169 | #ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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| 170 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::boost::detail::max_align,true)
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| 171 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::boost::detail::lower_alignment<1> ,true)
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| 172 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::boost::detail::lower_alignment<2> ,true)
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| 173 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::boost::detail::lower_alignment<4> ,true)
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| 174 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::boost::detail::lower_alignment<8> ,true)
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| 175 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::boost::detail::lower_alignment<10> ,true)
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| 176 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::boost::detail::lower_alignment<16> ,true)
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| 177 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::boost::detail::lower_alignment<32> ,true)
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| 178 | #endif
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| 179 |
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| 180 | } // namespace detail
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| 181 |
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| 182 | #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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| 183 | template<std::size_t Align>
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| 184 | struct is_pod< ::boost::detail::lower_alignment<Align> >
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| 185 | {
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| 186 | BOOST_STATIC_CONSTANT(std::size_t, value = true);
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| 187 | };
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| 188 | #endif
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| 189 |
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| 190 | // This alignment method originally due to Brian Parker, implemented by David
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| 191 | // Abrahams, and then ported here by Doug Gregor.
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| 192 | template <std::size_t Align>
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| 193 | class type_with_alignment
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| 194 | {
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| 195 | typedef detail::lower_alignment<Align> t1;
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| 196 | typedef typename mpl::if_c<
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| 197 | ::boost::detail::is_aligned< ::boost::alignment_of<t1>::value,Align >::value
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| 198 | , t1
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| 199 | , detail::max_align
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| 200 | >::type align_t;
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| 201 |
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| 202 | BOOST_STATIC_CONSTANT(std::size_t, found = alignment_of<align_t>::value);
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| 203 |
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| 204 | BOOST_STATIC_ASSERT(found >= Align);
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| 205 | BOOST_STATIC_ASSERT(found % Align == 0);
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| 206 |
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| 207 | public:
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| 208 | typedef align_t type;
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| 209 | };
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| 210 |
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| 211 | #if defined(__GNUC__)
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| 212 | namespace align {
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| 213 | struct __attribute__((__aligned__(2))) a2 {};
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| 214 | struct __attribute__((__aligned__(4))) a4 {};
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| 215 | struct __attribute__((__aligned__(8))) a8 {};
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| 216 | struct __attribute__((__aligned__(16))) a16 {};
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| 217 | struct __attribute__((__aligned__(32))) a32 {};
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| 218 | }
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| 219 |
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| 220 | template<> class type_with_alignment<1> { public: typedef char type; };
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| 221 | template<> class type_with_alignment<2> { public: typedef align::a2 type; };
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| 222 | template<> class type_with_alignment<4> { public: typedef align::a4 type; };
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| 223 | template<> class type_with_alignment<8> { public: typedef align::a8 type; };
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| 224 | template<> class type_with_alignment<16> { public: typedef align::a16 type; };
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| 225 | template<> class type_with_alignment<32> { public: typedef align::a32 type; };
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| 226 |
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| 227 | namespace detail {
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| 228 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::boost::align::a2,true)
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| 229 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::boost::align::a4,true)
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| 230 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::boost::align::a8,true)
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| 231 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::boost::align::a16,true)
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| 232 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::boost::align::a32,true)
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| 233 | }
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| 234 | #endif
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| 235 |
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| 236 | #else
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| 237 |
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| 238 | //
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| 239 | // Borland specific version, we have this for two reasons:
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| 240 | // 1) The version above doesn't always compile (with the new test cases for example)
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| 241 | // 2) Because of Borlands #pragma option we can create types with alignments that are
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| 242 | // greater that the largest aligned builtin type.
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| 243 |
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| 244 | namespace align{
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| 245 | #pragma option push -a16
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| 246 | struct a2{ short s; };
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| 247 | struct a4{ int s; };
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| 248 | struct a8{ double s; };
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| 249 | struct a16{ long double s; };
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| 250 | #pragma option pop
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| 251 | }
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| 252 |
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| 253 | namespace detail {
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| 254 |
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| 255 | typedef ::boost::align::a16 max_align;
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| 256 |
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| 257 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::boost::align::a2,true)
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| 258 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::boost::align::a4,true)
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| 259 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::boost::align::a8,true)
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| 260 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::boost::align::a16,true)
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| 261 | }
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| 262 |
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| 263 | template <std::size_t N> struct type_with_alignment
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| 264 | {
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| 265 | // We should never get to here, but if we do use the maximally
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| 266 | // aligned type:
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| 267 | // BOOST_STATIC_ASSERT(0);
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| 268 | typedef align::a16 type;
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| 269 | };
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| 270 | template <> struct type_with_alignment<1>{ typedef char type; };
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| 271 | template <> struct type_with_alignment<2>{ typedef align::a2 type; };
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| 272 | template <> struct type_with_alignment<4>{ typedef align::a4 type; };
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| 273 | template <> struct type_with_alignment<8>{ typedef align::a8 type; };
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| 274 | template <> struct type_with_alignment<16>{ typedef align::a16 type; };
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| 275 |
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| 276 | #endif
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| 277 |
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| 278 | } // namespace boost
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| 279 |
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| 280 | #ifdef BOOST_MSVC
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| 281 | # pragma warning(pop)
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| 282 | #endif
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| 283 |
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| 284 | #include "boost/type_traits/detail/bool_trait_undef.hpp"
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| 285 |
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| 286 | #endif // BOOST_TT_TYPE_WITH_ALIGNMENT_INCLUDED
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| 287 |
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| 288 |
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