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111
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1 // New abi Support -*- C++ -*-
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2
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3 // Copyright (C) 2000-2017 Free Software Foundation, Inc.
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4 //
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5 // This file is part of GCC.
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6 //
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7 // GCC is free software; you can redistribute it and/or modify
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8 // it under the terms of the GNU General Public License as published by
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9 // the Free Software Foundation; either version 3, or (at your option)
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10 // any later version.
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11
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12 // GCC is distributed in the hope that it will be useful,
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13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 // GNU General Public License for more details.
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16
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17 // Under Section 7 of GPL version 3, you are granted additional
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18 // permissions described in the GCC Runtime Library Exception, version
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19 // 3.1, as published by the Free Software Foundation.
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20
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21 // You should have received a copy of the GNU General Public License and
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22 // a copy of the GCC Runtime Library Exception along with this program;
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23 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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24 // <http://www.gnu.org/licenses/>.
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25
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26 // Written by Nathan Sidwell, Codesourcery LLC, <nathan@codesourcery.com>
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27
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28 #include <cxxabi.h>
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29 #include <new>
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30 #include <exception>
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31 #include <bits/exception_defines.h>
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32 #include "unwind-cxx.h"
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33
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34 namespace __cxxabiv1
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35 {
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36 namespace
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37 {
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38 struct uncatch_exception
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39 {
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40 uncatch_exception();
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41 ~uncatch_exception () { __cxa_begin_catch (&p->unwindHeader); }
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42
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43 __cxa_exception* p;
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44
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45 private:
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46 uncatch_exception&
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47 operator=(const uncatch_exception&);
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48
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49 uncatch_exception(const uncatch_exception&);
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50 };
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51
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52 uncatch_exception::uncatch_exception() : p(0)
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53 {
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54 __cxa_eh_globals *globals = __cxa_get_globals_fast ();
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55
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56 p = globals->caughtExceptions;
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57 p->handlerCount -= 1;
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58 globals->caughtExceptions = p->nextException;
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59 globals->uncaughtExceptions += 1;
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60 }
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61
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62 // Compute the total size with overflow checking.
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63 std::size_t compute_size(std::size_t element_count,
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64 std::size_t element_size,
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65 std::size_t padding_size)
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66 {
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67 if (element_size && element_count > std::size_t(-1) / element_size)
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68 _GLIBCXX_THROW_OR_ABORT(std::bad_alloc());
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69 std::size_t size = element_count * element_size;
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70 if (size + padding_size < size)
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71 _GLIBCXX_THROW_OR_ABORT(std::bad_alloc());
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72 return size + padding_size;
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73 }
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74 }
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75
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76 // Allocate and construct array.
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77 extern "C" void *
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78 __cxa_vec_new(std::size_t element_count,
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79 std::size_t element_size,
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80 std::size_t padding_size,
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81 __cxa_cdtor_type constructor,
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82 __cxa_cdtor_type destructor)
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83 {
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84 return __cxa_vec_new2(element_count, element_size, padding_size,
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85 constructor, destructor,
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86 &operator new[], &operator delete []);
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87 }
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88
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89 extern "C" void *
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90 __cxa_vec_new2(std::size_t element_count,
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91 std::size_t element_size,
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92 std::size_t padding_size,
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93 __cxa_cdtor_type constructor,
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94 __cxa_cdtor_type destructor,
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95 void *(*alloc) (std::size_t),
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96 void (*dealloc) (void *))
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97 {
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98 std::size_t size
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99 = compute_size(element_count, element_size, padding_size);
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100 char *base = static_cast <char *> (alloc (size));
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101 if (!base)
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102 return base;
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103
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104 if (padding_size)
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105 {
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106 base += padding_size;
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107 reinterpret_cast <std::size_t *> (base)[-1] = element_count;
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108 #ifdef _GLIBCXX_ELTSIZE_IN_COOKIE
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109 reinterpret_cast <std::size_t *> (base)[-2] = element_size;
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110 #endif
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111 }
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112 __try
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113 {
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114 __cxa_vec_ctor(base, element_count, element_size,
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115 constructor, destructor);
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116 }
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117 __catch(...)
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118 {
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119 {
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120 uncatch_exception ue;
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121 // Core issue 901 will probably be resolved such that a
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122 // deleted operator delete means not freeing memory here.
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123 if (dealloc)
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124 dealloc(base - padding_size);
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125 }
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126 __throw_exception_again;
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127 }
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128 return base;
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129 }
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130
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131 extern "C" void *
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132 __cxa_vec_new3(std::size_t element_count,
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133 std::size_t element_size,
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134 std::size_t padding_size,
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135 __cxa_cdtor_type constructor,
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136 __cxa_cdtor_type destructor,
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137 void *(*alloc) (std::size_t),
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138 void (*dealloc) (void *, std::size_t))
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139 {
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140 std::size_t size
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141 = compute_size(element_count, element_size, padding_size);
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142 char *base = static_cast<char *>(alloc (size));
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143 if (!base)
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144 return base;
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145
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146 if (padding_size)
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147 {
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148 base += padding_size;
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149 reinterpret_cast<std::size_t *>(base)[-1] = element_count;
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150 #ifdef _GLIBCXX_ELTSIZE_IN_COOKIE
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151 reinterpret_cast <std::size_t *> (base)[-2] = element_size;
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152 #endif
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153 }
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154 __try
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155 {
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156 __cxa_vec_ctor(base, element_count, element_size,
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157 constructor, destructor);
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158 }
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159 __catch(...)
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160 {
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161 {
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162 uncatch_exception ue;
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163 if (dealloc)
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164 dealloc(base - padding_size, size);
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165 }
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166 __throw_exception_again;
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167 }
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168 return base;
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169 }
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170
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171 // Construct array.
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172 extern "C" __cxa_vec_ctor_return_type
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173 __cxa_vec_ctor(void *array_address,
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174 std::size_t element_count,
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175 std::size_t element_size,
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176 __cxa_cdtor_type constructor,
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177 __cxa_cdtor_type destructor)
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178 {
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179 std::size_t ix = 0;
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180 char *ptr = static_cast<char *>(array_address);
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181
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182 __try
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183 {
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184 if (constructor)
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185 for (; ix != element_count; ix++, ptr += element_size)
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186 constructor(ptr);
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187 }
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188 __catch(...)
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189 {
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190 {
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191 uncatch_exception ue;
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192 __cxa_vec_cleanup(array_address, ix, element_size, destructor);
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193 }
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194 __throw_exception_again;
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195 }
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196 _GLIBCXX_CXA_VEC_CTOR_RETURN (array_address);
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197 }
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198
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199 // Construct an array by copying.
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200 extern "C" __cxa_vec_ctor_return_type
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201 __cxa_vec_cctor(void *dest_array,
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202 void *src_array,
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203 std::size_t element_count,
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204 std::size_t element_size,
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205 __cxa_cdtor_return_type (*constructor) (void *, void *),
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206 __cxa_cdtor_type destructor)
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207 {
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208 std::size_t ix = 0;
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209 char *dest_ptr = static_cast<char *>(dest_array);
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210 char *src_ptr = static_cast<char *>(src_array);
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211
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212 __try
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213 {
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214 if (constructor)
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215 for (; ix != element_count;
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216 ix++, src_ptr += element_size, dest_ptr += element_size)
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217 constructor(dest_ptr, src_ptr);
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218 }
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219 __catch(...)
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220 {
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221 {
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222 uncatch_exception ue;
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223 __cxa_vec_cleanup(dest_array, ix, element_size, destructor);
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224 }
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225 __throw_exception_again;
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226 }
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227 _GLIBCXX_CXA_VEC_CTOR_RETURN (dest_array);
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228 }
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229
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230 // Destruct array.
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231 extern "C" void
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232 __cxa_vec_dtor(void *array_address,
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233 std::size_t element_count,
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234 std::size_t element_size,
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235 __cxa_cdtor_type destructor)
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236 {
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237 if (destructor)
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238 {
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239 char *ptr = static_cast<char *>(array_address);
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240 std::size_t ix = element_count;
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241
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242 ptr += element_count * element_size;
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243
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244 __try
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245 {
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246 while (ix--)
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247 {
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248 ptr -= element_size;
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249 destructor(ptr);
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250 }
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251 }
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252 __catch(...)
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253 {
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254 {
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255 uncatch_exception ue;
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256 __cxa_vec_cleanup(array_address, ix, element_size, destructor);
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257 }
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258 __throw_exception_again;
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259 }
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260 }
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261 }
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262
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263 // Destruct array as a result of throwing an exception.
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264 // [except.ctor]/3 If a destructor called during stack unwinding
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265 // exits with an exception, terminate is called.
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266 extern "C" void
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267 __cxa_vec_cleanup(void *array_address,
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268 std::size_t element_count,
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269 std::size_t element_size,
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270 __cxa_cdtor_type destructor) throw()
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271 {
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272 if (destructor)
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273 {
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274 char *ptr = static_cast <char *> (array_address);
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275 std::size_t ix = element_count;
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276
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277 ptr += element_count * element_size;
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278
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279 __try
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280 {
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281 while (ix--)
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282 {
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283 ptr -= element_size;
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284 destructor(ptr);
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285 }
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286 }
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287 __catch(...)
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288 {
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289 std::terminate();
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290 }
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291 }
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292 }
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293
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294 // Destruct and release array.
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295 extern "C" void
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296 __cxa_vec_delete(void *array_address,
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297 std::size_t element_size,
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298 std::size_t padding_size,
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299 __cxa_cdtor_type destructor)
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300 {
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301 __cxa_vec_delete2(array_address, element_size, padding_size,
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302 destructor,
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303 &operator delete []);
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304 }
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305
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306 extern "C" void
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307 __cxa_vec_delete2(void *array_address,
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308 std::size_t element_size,
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309 std::size_t padding_size,
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310 __cxa_cdtor_type destructor,
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311 void (*dealloc) (void *))
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312 {
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313 if (!array_address)
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314 return;
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315
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316 char* base = static_cast<char *>(array_address);
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317
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318 if (padding_size)
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319 {
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320 std::size_t element_count = reinterpret_cast<std::size_t *>(base)[-1];
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321 base -= padding_size;
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322 __try
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323 {
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324 __cxa_vec_dtor(array_address, element_count, element_size,
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325 destructor);
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326 }
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327 __catch(...)
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328 {
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329 {
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330 uncatch_exception ue;
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331 dealloc(base);
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332 }
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333 __throw_exception_again;
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334 }
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335 }
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336 dealloc(base);
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337 }
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338
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339 extern "C" void
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340 __cxa_vec_delete3(void *array_address,
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341 std::size_t element_size,
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342 std::size_t padding_size,
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343 __cxa_cdtor_type destructor,
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344 void (*dealloc) (void *, std::size_t))
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345 {
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346 if (!array_address)
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347 return;
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348
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349 char* base = static_cast <char *> (array_address);
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350 std::size_t size = 0;
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351
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352 if (padding_size)
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353 {
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354 std::size_t element_count = reinterpret_cast<std::size_t *> (base)[-1];
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355 base -= padding_size;
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356 size = element_count * element_size + padding_size;
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357 __try
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358 {
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359 __cxa_vec_dtor(array_address, element_count, element_size,
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360 destructor);
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361 }
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362 __catch(...)
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363 {
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364 {
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365 uncatch_exception ue;
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366 dealloc(base, size);
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367 }
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368 __throw_exception_again;
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369 }
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370 }
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371 dealloc(base, size);
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372 }
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373 } // namespace __cxxabiv1
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374
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375 #if defined(__arm__) && defined(__ARM_EABI__)
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376
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377 // The ARM C++ ABI requires that the library provide these additional
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378 // helper functions. There are placed in this file, despite being
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379 // architecture-specifier, so that the compiler can inline the __cxa
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380 // functions into these functions as appropriate.
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381
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382 namespace __aeabiv1
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383 {
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384 extern "C" void *
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385 __aeabi_vec_ctor_nocookie_nodtor (void *array_address,
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386 abi::__cxa_cdtor_type constructor,
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387 std::size_t element_size,
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388 std::size_t element_count)
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389 {
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390 return abi::__cxa_vec_ctor (array_address, element_count, element_size,
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391 constructor, /*destructor=*/NULL);
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392 }
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393
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394 extern "C" void *
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395 __aeabi_vec_ctor_cookie_nodtor (void *array_address,
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396 abi::__cxa_cdtor_type constructor,
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397 std::size_t element_size,
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398 std::size_t element_count)
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399 {
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400 if (array_address == NULL)
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401 return NULL;
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402
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403 array_address = reinterpret_cast<std::size_t *>(array_address) + 2;
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404 reinterpret_cast<std::size_t *>(array_address)[-2] = element_size;
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405 reinterpret_cast<std::size_t *>(array_address)[-1] = element_count;
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406 return abi::__cxa_vec_ctor (array_address,
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407 element_count, element_size,
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408 constructor, /*destructor=*/NULL);
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409 }
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410
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411 extern "C" void *
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412 __aeabi_vec_cctor_nocookie_nodtor (void *dest_array,
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413 void *src_array,
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414 std::size_t element_size,
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415 std::size_t element_count,
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416 void *(*constructor) (void *, void *))
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417 {
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418 return abi::__cxa_vec_cctor (dest_array, src_array,
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419 element_count, element_size,
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420 constructor, NULL);
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421 }
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422
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423 extern "C" void *
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424 __aeabi_vec_new_cookie_noctor (std::size_t element_size,
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425 std::size_t element_count)
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426 {
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427 return abi::__cxa_vec_new(element_count, element_size,
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428 2 * sizeof (std::size_t),
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429 /*constructor=*/NULL, /*destructor=*/NULL);
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430 }
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431
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432 extern "C" void *
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433 __aeabi_vec_new_nocookie (std::size_t element_size,
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434 std::size_t element_count,
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435 abi::__cxa_cdtor_type constructor)
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436 {
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437 return abi::__cxa_vec_new (element_count, element_size, 0, constructor,
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438 NULL);
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439 }
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440
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441 extern "C" void *
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442 __aeabi_vec_new_cookie_nodtor (std::size_t element_size,
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443 std::size_t element_count,
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444 abi::__cxa_cdtor_type constructor)
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445 {
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446 return abi::__cxa_vec_new(element_count, element_size,
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447 2 * sizeof (std::size_t),
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448 constructor, NULL);
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449 }
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450
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451 extern "C" void *
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452 __aeabi_vec_new_cookie(std::size_t element_size,
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453 std::size_t element_count,
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454 abi::__cxa_cdtor_type constructor,
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455 abi::__cxa_cdtor_type destructor)
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456 {
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457 return abi::__cxa_vec_new (element_count, element_size,
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458 2 * sizeof (std::size_t),
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459 constructor, destructor);
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460 }
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461
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462
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463 extern "C" void *
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464 __aeabi_vec_dtor (void *array_address,
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465 abi::__cxa_cdtor_type destructor,
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466 std::size_t element_size,
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467 std::size_t element_count)
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468 {
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469 abi::__cxa_vec_dtor (array_address, element_count, element_size,
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470 destructor);
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471 return reinterpret_cast<std::size_t*> (array_address) - 2;
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472 }
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473
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474 extern "C" void *
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475 __aeabi_vec_dtor_cookie (void *array_address,
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476 abi::__cxa_cdtor_type destructor)
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477 {
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478 if (!array_address)
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479 return NULL;
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480
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481 abi::__cxa_vec_dtor (array_address,
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482 reinterpret_cast<std::size_t *>(array_address)[-1],
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483 reinterpret_cast<std::size_t *>(array_address)[-2],
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484 destructor);
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485 return reinterpret_cast<std::size_t*> (array_address) - 2;
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486 }
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487
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488
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489 extern "C" void
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490 __aeabi_vec_delete (void *array_address,
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491 abi::__cxa_cdtor_type destructor)
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492 {
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493 if (!array_address)
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494 return;
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495
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496 abi::__cxa_vec_delete (array_address,
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497 reinterpret_cast<std::size_t *>(array_address)[-2],
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498 2 * sizeof (std::size_t),
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499 destructor);
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500 }
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501
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502 extern "C" void
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503 __aeabi_vec_delete3 (void *array_address,
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504 abi::__cxa_cdtor_type destructor,
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505 void (*dealloc) (void *, std::size_t))
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506 {
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507 if (!array_address)
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508 return;
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509
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510 abi::__cxa_vec_delete3 (array_address,
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511 reinterpret_cast<std::size_t *>(array_address)[-2],
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512 2 * sizeof (std::size_t),
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513 destructor, dealloc);
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514 }
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515
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516 extern "C" void
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517 __aeabi_vec_delete3_nodtor (void *array_address,
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518 void (*dealloc) (void *, std::size_t))
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519 {
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520 if (!array_address)
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521 return;
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522
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523 abi::__cxa_vec_delete3 (array_address,
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524 reinterpret_cast<std::size_t *>(array_address)[-2],
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525 2 * sizeof (std::size_t),
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526 /*destructor=*/NULL, dealloc);
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527 }
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528 } // namespace __aeabiv1
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529
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530 #endif // defined(__arm__) && defined(__ARM_EABI__)
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