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>>>>> tag v1.26.5+1 for changeset b74429b0f5c4
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:17:30 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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2
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1 /*
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2 * Copyright © 2018 Google, Inc.
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3 *
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4 * This is part of HarfBuzz, a text shaping library.
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5 *
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6 * Permission is hereby granted, without written agreement and without
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7 * license or royalty fees, to use, copy, modify, and distribute this
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8 * software and its documentation for any purpose, provided that the
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9 * above copyright notice and the following two paragraphs appear in
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10 * all copies of this software.
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11 *
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12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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16 * DAMAGE.
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17 *
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18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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20 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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23 *
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24 * Google Author(s): Behdad Esfahbod
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25 */
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27 #ifndef HB_NULL_HH
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28 #define HB_NULL_HH
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30 #include "hb.hh"
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31 #include "hb-meta.hh"
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32
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34 /*
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35 * Static pools
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36 */
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38 /* Global nul-content Null pool. Enlarge as necessary. */
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39
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40 #define HB_NULL_POOL_SIZE 448
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42 template <typename T, typename>
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43 struct _hb_has_min_size : hb_false_type {};
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44 template <typename T>
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45 struct _hb_has_min_size<T, hb_void_t<decltype (T::min_size)>>
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46 : hb_true_type {};
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47 template <typename T>
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48 using hb_has_min_size = _hb_has_min_size<T, void>;
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49 #define hb_has_min_size(T) hb_has_min_size<T>::value
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51 template <typename T, typename>
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52 struct _hb_has_null_size : hb_false_type {};
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53 template <typename T>
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54 struct _hb_has_null_size<T, hb_void_t<decltype (T::null_size)>>
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55 : hb_true_type {};
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56 template <typename T>
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57 using hb_has_null_size = _hb_has_null_size<T, void>;
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58 #define hb_has_null_size(T) hb_has_null_size<T>::value
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59
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60 /* Use SFINAE to sniff whether T has min_size; in which case return the larger
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61 * of sizeof(T) and T::null_size, otherwise return sizeof(T).
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62 *
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63 * The main purpose of this is to let structs communicate that they are not nullable,
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64 * by defining min_size but *not* null_size. */
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65
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66 /* The hard way...
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67 * https://stackoverflow.com/questions/7776448/sfinae-tried-with-bool-gives-compiler-error-template-argument-tvalue-invol
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68 */
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70 template <typename T, typename>
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71 struct _hb_null_size : hb_integral_constant<unsigned, sizeof (T)> {};
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72 template <typename T>
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73 struct _hb_null_size<T, hb_void_t<decltype (T::min_size)>>
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74 : hb_integral_constant<unsigned,
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75 (sizeof (T) > T::null_size ? sizeof (T) : T::null_size)> {};
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76 template <typename T>
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77 using hb_null_size = _hb_null_size<T, void>;
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78 #define hb_null_size(T) hb_null_size<T>::value
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79
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80 /* These doesn't belong here, but since is copy/paste from above, put it here. */
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81
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82 /* hb_static_size (T)
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83 * Returns T::static_size if T::min_size is defined, or sizeof (T) otherwise. */
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84
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85 template <typename T, typename>
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86 struct _hb_static_size : hb_integral_constant<unsigned, sizeof (T)> {};
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87 template <typename T>
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88 struct _hb_static_size<T, hb_void_t<decltype (T::min_size)>> : hb_integral_constant<unsigned, T::static_size> {};
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89 template <typename T>
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90 using hb_static_size = _hb_static_size<T, void>;
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91 #define hb_static_size(T) hb_static_size<T>::value
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93 template <typename T, typename>
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94 struct _hb_min_size : hb_integral_constant<unsigned, sizeof (T)> {};
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95 template <typename T>
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96 struct _hb_min_size<T, hb_void_t<decltype (T::min_size)>> : hb_integral_constant<unsigned, T::min_size> {};
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97 template <typename T>
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98 using hb_min_size = _hb_min_size<T, void>;
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99 #define hb_min_size(T) hb_min_size<T>::value
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100
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101
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102 /*
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103 * Null()
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104 */
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105
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106 extern HB_INTERNAL
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107 uint64_t const _hb_NullPool[(HB_NULL_POOL_SIZE + sizeof (uint64_t) - 1) / sizeof (uint64_t)];
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108
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109 /* Generic nul-content Null objects. */
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110 template <typename Type>
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111 struct Null {
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112 static Type const & get_null ()
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113 {
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114 static_assert (hb_null_size (Type) <= HB_NULL_POOL_SIZE, "Increase HB_NULL_POOL_SIZE.");
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115 return *reinterpret_cast<Type const *> (_hb_NullPool);
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116 }
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117 };
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118 template <typename QType>
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119 struct NullHelper
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120 {
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121 typedef hb_remove_const<hb_remove_reference<QType>> Type;
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122 static const Type & get_null () { return Null<Type>::get_null (); }
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123 };
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124 #define Null(Type) NullHelper<Type>::get_null ()
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125
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126 /* Specializations for arbitrary-content Null objects expressed in bytes. */
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127 #define DECLARE_NULL_NAMESPACE_BYTES(Namespace, Type) \
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128 } /* Close namespace. */ \
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129 extern HB_INTERNAL const unsigned char _hb_Null_##Namespace##_##Type[hb_null_size (Namespace::Type)]; \
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130 template <> \
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131 struct Null<Namespace::Type> { \
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132 static Namespace::Type const & get_null () { \
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133 return *reinterpret_cast<const Namespace::Type *> (_hb_Null_##Namespace##_##Type); \
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134 } \
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135 }; \
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136 namespace Namespace { \
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137 static_assert (true, "") /* Require semicolon after. */
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138 #define DECLARE_NULL_NAMESPACE_BYTES_TEMPLATE1(Namespace, Type, Size) \
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139 } /* Close namespace. */ \
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140 extern HB_INTERNAL const unsigned char _hb_Null_##Namespace##_##Type[Size]; \
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141 template <typename Spec> \
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142 struct Null<Namespace::Type<Spec>> { \
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143 static Namespace::Type<Spec> const & get_null () { \
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144 return *reinterpret_cast<const Namespace::Type<Spec> *> (_hb_Null_##Namespace##_##Type); \
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145 } \
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146 }; \
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147 namespace Namespace { \
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148 static_assert (true, "") /* Require semicolon after. */
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149 #define DEFINE_NULL_NAMESPACE_BYTES(Namespace, Type) \
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150 const unsigned char _hb_Null_##Namespace##_##Type[sizeof (_hb_Null_##Namespace##_##Type)]
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151
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152 /* Specializations for arbitrary-content Null objects expressed as struct initializer. */
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153 #define DECLARE_NULL_INSTANCE(Type) \
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154 extern HB_INTERNAL const Type _hb_Null_##Type; \
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155 template <> \
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156 struct Null<Type> { \
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157 static Type const & get_null () { \
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158 return _hb_Null_##Type; \
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159 } \
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160 }; \
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161 static_assert (true, "") /* Require semicolon after. */
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162 #define DEFINE_NULL_INSTANCE(Type) \
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163 const Type _hb_Null_##Type
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164
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165 /* Global writable pool. Enlarge as necessary. */
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166
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167 /* To be fully correct, CrapPool must be thread_local. However, we do not rely on CrapPool
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168 * for correct operation. It only exist to catch and divert program logic bugs instead of
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169 * causing bad memory access. So, races there are not actually introducing incorrectness
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170 * in the code. Has ~12kb binary size overhead to have it, also clang build fails with it. */
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171 extern HB_INTERNAL
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172 /*thread_local*/ uint64_t _hb_CrapPool[(HB_NULL_POOL_SIZE + sizeof (uint64_t) - 1) / sizeof (uint64_t)];
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173
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174 /* CRAP pool: Common Region for Access Protection. */
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175 template <typename Type>
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176 static inline Type& Crap () {
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177 static_assert (hb_null_size (Type) <= HB_NULL_POOL_SIZE, "Increase HB_NULL_POOL_SIZE.");
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178 Type *obj = reinterpret_cast<Type *> (_hb_CrapPool);
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179 memcpy (obj, &Null (Type), sizeof (*obj));
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180 return *obj;
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181 }
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182 template <typename QType>
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183 struct CrapHelper
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184 {
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185 typedef hb_remove_const<hb_remove_reference<QType>> Type;
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186 static Type & get_crap () { return Crap<Type> (); }
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187 };
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188 #define Crap(Type) CrapHelper<Type>::get_crap ()
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189
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190 template <typename Type>
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191 struct CrapOrNullHelper {
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192 static Type & get () { return Crap (Type); }
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193 };
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194 template <typename Type>
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195 struct CrapOrNullHelper<const Type> {
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196 static const Type & get () { return Null (Type); }
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197 };
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198 #define CrapOrNull(Type) CrapOrNullHelper<Type>::get ()
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199
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200
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201 /*
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202 * hb_nonnull_ptr_t
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203 */
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204
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205 template <typename P>
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206 struct hb_nonnull_ptr_t
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207 {
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208 typedef hb_remove_pointer<P> T;
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209
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210 hb_nonnull_ptr_t (T *v_ = nullptr) : v (v_) {}
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211 T * operator = (T *v_) { return v = v_; }
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212 T * operator -> () const { return get (); }
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213 T & operator * () const { return *get (); }
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214 T ** operator & () const { return &v; }
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215 /* Only auto-cast to const types. */
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216 template <typename C> operator const C * () const { return get (); }
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217 operator const char * () const { return (const char *) get (); }
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218 T * get () const { return v ? v : const_cast<T *> (&Null (T)); }
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219 T * get_raw () const { return v; }
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220
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221 private:
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222 T *v;
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223 };
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224
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225
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226 #endif /* HB_NULL_HH */