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annotate gcc/config/i386/winnt-cxx.c @ 131:84e7813d76e9

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gcc-8.2
author mir3636
date Thu, 25 Oct 2018 07:37:49 +0900
parents 04ced10e8804
children 1830386684a0
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1 /* Target support for C++ classes on Windows.
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2 Contributed by Danny Smith (dannysmith@users.sourceforge.net)
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3 Copyright (C) 2005-2018 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 it under
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8 the terms of the GNU General Public License as published by the Free
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9 Software Foundation; either version 3, or (at your option) any later
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10 version.
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11
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12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with GCC; see the file COPYING3. If not see
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19 <http://www.gnu.org/licenses/>. */
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20
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21 #define IN_TARGET_CODE 1
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22
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23 #include "config.h"
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24 #include "system.h"
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25 #include "coretypes.h"
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26 #include "cp/cp-tree.h" /* This is why we're a separate module. */
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27 #include "stringpool.h"
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28 #include "attribs.h"
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29
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30 bool
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31 i386_pe_type_dllimport_p (tree decl)
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32 {
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33 gcc_assert (TREE_CODE (decl) == VAR_DECL
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34 || TREE_CODE (decl) == FUNCTION_DECL);
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35
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36 if (TARGET_NOP_FUN_DLLIMPORT && TREE_CODE (decl) == FUNCTION_DECL)
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37 return false;
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38
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39 /* We ignore the dllimport attribute for inline member functions.
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40 This differs from MSVC behavior which treats it like GNUC
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41 'extern inline' extension. Also ignore for template
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42 instantiations with linkonce semantics and artificial methods. */
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43 if (TREE_CODE (decl) == FUNCTION_DECL
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44 && (DECL_DECLARED_INLINE_P (decl)
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45 || DECL_TEMPLATE_INSTANTIATION (decl)
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46 || DECL_ARTIFICIAL (decl)))
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47 return false;
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48
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49 /* Overrides of the class dllimport decls by out-of-class definitions are
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50 handled by tree.c:merge_dllimport_decl_attributes. */
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51 return true;
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52 }
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53
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54 bool
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55 i386_pe_type_dllexport_p (tree decl)
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56 {
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57 gcc_assert (TREE_CODE (decl) == VAR_DECL
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58 || TREE_CODE (decl) == FUNCTION_DECL);
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59
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60 /* Avoid exporting compiler-generated default dtors and copy ctors.
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61 The only artificial methods that need to be exported are virtual
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62 and non-virtual thunks. */
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63 if (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE
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64 && DECL_ARTIFICIAL (decl) && !DECL_THUNK_P (decl))
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65 return false;
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66 if (TREE_CODE (decl) == FUNCTION_DECL
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67 && DECL_DECLARED_INLINE_P (decl))
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68 {
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69 if (DECL_REALLY_EXTERN (decl)
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70 || !flag_keep_inline_dllexport)
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71 return false;
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72 }
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73 return true;
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74 }
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75
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76 static inline void maybe_add_dllimport (tree decl)
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77 {
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78 if (i386_pe_type_dllimport_p (decl))
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79 DECL_DLLIMPORT_P (decl) = 1;
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80 }
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81
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82 static inline void maybe_add_dllexport (tree decl)
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83 {
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84 if (i386_pe_type_dllexport_p (decl))
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85 {
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86 tree decl_attrs = DECL_ATTRIBUTES (decl);
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87 if (lookup_attribute ("dllexport", decl_attrs) != NULL_TREE)
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88 /* Already done. */
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89 return;
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90 DECL_ATTRIBUTES (decl) = tree_cons (get_identifier ("dllexport"),
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91 NULL_TREE, decl_attrs);
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92 }
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93 }
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94
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95 void
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96 i386_pe_adjust_class_at_definition (tree t)
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97 {
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98 tree member;
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99
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100 gcc_assert (CLASS_TYPE_P (t));
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101
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102
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103 if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (t)) != NULL_TREE)
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104 {
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105 tree tmv = TYPE_MAIN_VARIANT (t);
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106
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107 /* Make sure that we set dllexport attribute to typeinfo's
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108 base declaration, as otherwise it would fail to be exported as
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109 it isn't a class-member. */
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110 if (tmv != NULL_TREE
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111 && CLASSTYPE_TYPEINFO_VAR (tmv) != NULL_TREE)
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112 {
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113 tree na, ti_decl = CLASSTYPE_TYPEINFO_VAR (tmv);
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114 na = tree_cons (get_identifier ("dllexport"), NULL_TREE,
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115 NULL_TREE);
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116 decl_attributes (&ti_decl, na, 0);
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117 }
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118
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119 /* Check FUNCTION_DECL's and static VAR_DECL's. */
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120 for (member = TYPE_FIELDS (t); member; member = DECL_CHAIN (member))
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121 if (TREE_CODE (member) == VAR_DECL)
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122 maybe_add_dllexport (member);
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123 else if (TREE_CODE (member) == FUNCTION_DECL)
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124 {
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125 tree thunk;
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126 maybe_add_dllexport (member);
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127
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128 /* Also add the attribute to its thunks. */
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129 for (thunk = DECL_THUNKS (member); thunk;
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130 thunk = TREE_CHAIN (thunk))
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131 maybe_add_dllexport (thunk);
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132 }
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133
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134 /* Check vtables */
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135 for (member = CLASSTYPE_VTABLES (t);
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136 member; member = DECL_CHAIN (member))
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137 if (TREE_CODE (member) == VAR_DECL)
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138 maybe_add_dllexport (member);
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139 }
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140
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141 else if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (t)) != NULL_TREE)
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142 {
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143 /* We don't actually add the attribute to the decl, just set the flag
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144 that signals that the address of this symbol is not a compile-time
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145 constant. Any subsequent out-of-class declaration of members wil
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146 cause the DECL_DLLIMPORT_P flag to be unset.
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147 (See tree.c: merge_dllimport_decl_attributes).
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148 That is just right since out-of class declarations can only be a
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149 definition. */
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150
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151 /* Check FUNCTION_DECL's and static VAR_DECL's. */
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152 for (member = TYPE_FIELDS (t); member; member = DECL_CHAIN (member))
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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153 if (TREE_CODE (member) == VAR_DECL)
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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154 maybe_add_dllimport (member);
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155 else if (TREE_CODE (member) == FUNCTION_DECL)
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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156 {
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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157 tree thunk;
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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158 maybe_add_dllimport (member);
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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159
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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160 /* Also add the attribute to its thunks. */
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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161 for (thunk = DECL_THUNKS (member); thunk;
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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162 thunk = DECL_CHAIN (thunk))
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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163 maybe_add_dllimport (thunk);
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164 }
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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165
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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166 /* Check vtables */
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167 for (member = CLASSTYPE_VTABLES (t);
kono
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168 member; member = DECL_CHAIN (member))
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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169 if (TREE_CODE (member) == VAR_DECL)
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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170 maybe_add_dllimport (member);
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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171
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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172 /* We leave typeinfo tables alone. We can't mark TI objects as
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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173 dllimport, since the address of a secondary VTT may be needed
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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174 for static initialization of a primary VTT. VTT's of
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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175 dllimport'd classes should always be link-once COMDAT. */
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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176 }
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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177 }