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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