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annotate gcc/config/i386/winnt-cxx.c @ 111:04ced10e8804

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gcc 7
author kono
date Fri, 27 Oct 2017 22:46:09 +0900
parents f6334be47118
children 84e7813d76e9
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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) 2005-2017 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 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 #include "config.h"
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22 #include "system.h"
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23 #include "coretypes.h"
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24 #include "cp/cp-tree.h" /* This is why we're a separate module. */
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25 #include "stringpool.h"
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26 #include "attribs.h"
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28 bool
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29 i386_pe_type_dllimport_p (tree decl)
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30 {
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31 gcc_assert (TREE_CODE (decl) == VAR_DECL
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32 || TREE_CODE (decl) == FUNCTION_DECL);
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33
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34 if (TARGET_NOP_FUN_DLLIMPORT && TREE_CODE (decl) == FUNCTION_DECL)
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35 return false;
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36
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37 /* We ignore the dllimport attribute for inline member functions.
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38 This differs from MSVC behavior which treats it like GNUC
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39 'extern inline' extension. Also ignore for template
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40 instantiations with linkonce semantics and artificial methods. */
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41 if (TREE_CODE (decl) == FUNCTION_DECL
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42 && (DECL_DECLARED_INLINE_P (decl)
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43 || DECL_TEMPLATE_INSTANTIATION (decl)
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44 || DECL_ARTIFICIAL (decl)))
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45 return false;
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46
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47 /* Overrides of the class dllimport decls by out-of-class definitions are
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48 handled by tree.c:merge_dllimport_decl_attributes. */
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49 return true;
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50 }
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51
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52 bool
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53 i386_pe_type_dllexport_p (tree decl)
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54 {
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55 gcc_assert (TREE_CODE (decl) == VAR_DECL
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56 || TREE_CODE (decl) == FUNCTION_DECL);
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57
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58 /* Avoid exporting compiler-generated default dtors and copy ctors.
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59 The only artificial methods that need to be exported are virtual
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60 and non-virtual thunks. */
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61 if (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE
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62 && DECL_ARTIFICIAL (decl) && !DECL_THUNK_P (decl))
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63 return false;
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64 if (TREE_CODE (decl) == FUNCTION_DECL
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65 && DECL_DECLARED_INLINE_P (decl))
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66 {
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67 if (DECL_REALLY_EXTERN (decl)
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68 || !flag_keep_inline_dllexport)
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69 return false;
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70 }
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71 return true;
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72 }
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73
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74 static inline void maybe_add_dllimport (tree decl)
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75 {
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76 if (i386_pe_type_dllimport_p (decl))
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77 DECL_DLLIMPORT_P (decl) = 1;
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78 }
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79
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80 static inline void maybe_add_dllexport (tree decl)
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81 {
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82 if (i386_pe_type_dllexport_p (decl))
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83 {
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84 tree decl_attrs = DECL_ATTRIBUTES (decl);
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85 if (lookup_attribute ("dllexport", decl_attrs) != NULL_TREE)
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86 /* Already done. */
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87 return;
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88 DECL_ATTRIBUTES (decl) = tree_cons (get_identifier ("dllexport"),
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89 NULL_TREE, decl_attrs);
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90 }
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91 }
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92
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93 void
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94 i386_pe_adjust_class_at_definition (tree t)
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95 {
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96 tree member;
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97
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98 gcc_assert (CLASS_TYPE_P (t));
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99
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100
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101 if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (t)) != NULL_TREE)
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102 {
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103 tree tmv = TYPE_MAIN_VARIANT (t);
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104
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105 /* Make sure that we set dllexport attribute to typeinfo's
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106 base declaration, as otherwise it would fail to be exported as
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107 it isn't a class-member. */
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108 if (tmv != NULL_TREE
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109 && CLASSTYPE_TYPEINFO_VAR (tmv) != NULL_TREE)
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110 {
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111 tree na, ti_decl = CLASSTYPE_TYPEINFO_VAR (tmv);
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112 na = tree_cons (get_identifier ("dllexport"), NULL_TREE,
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113 NULL_TREE);
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114 decl_attributes (&ti_decl, na, 0);
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115 }
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116
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117 /* Check FUNCTION_DECL's and static VAR_DECL's. */
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118 for (member = TYPE_FIELDS (t); member; member = DECL_CHAIN (member))
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119 if (TREE_CODE (member) == VAR_DECL)
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120 maybe_add_dllexport (member);
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121 else if (TREE_CODE (member) == FUNCTION_DECL)
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122 {
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123 tree thunk;
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124 maybe_add_dllexport (member);
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125
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126 /* Also add the attribute to its thunks. */
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127 for (thunk = DECL_THUNKS (member); thunk;
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128 thunk = TREE_CHAIN (thunk))
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129 maybe_add_dllexport (thunk);
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130 }
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131
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132 /* Check vtables */
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133 for (member = CLASSTYPE_VTABLES (t);
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134 member; member = DECL_CHAIN (member))
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135 if (TREE_CODE (member) == VAR_DECL)
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136 maybe_add_dllexport (member);
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137 }
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138
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139 else if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (t)) != NULL_TREE)
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140 {
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141 /* We don't actually add the attribute to the decl, just set the flag
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142 that signals that the address of this symbol is not a compile-time
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143 constant. Any subsequent out-of-class declaration of members wil
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144 cause the DECL_DLLIMPORT_P flag to be unset.
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145 (See tree.c: merge_dllimport_decl_attributes).
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146 That is just right since out-of class declarations can only be a
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147 definition. */
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148
111
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149 /* Check FUNCTION_DECL's and static VAR_DECL's. */
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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diff changeset
150 for (member = TYPE_FIELDS (t); member; member = DECL_CHAIN (member))
55
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
151 if (TREE_CODE (member) == VAR_DECL)
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
152 maybe_add_dllimport (member);
111
kono
parents: 67
diff changeset
153 else if (TREE_CODE (member) == FUNCTION_DECL)
55
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
154 {
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
155 tree thunk;
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
156 maybe_add_dllimport (member);
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
157
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
158 /* Also add the attribute to its thunks. */
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
159 for (thunk = DECL_THUNKS (member); thunk;
67
f6334be47118 update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 55
diff changeset
160 thunk = DECL_CHAIN (thunk))
55
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
161 maybe_add_dllimport (thunk);
111
kono
parents: 67
diff changeset
162 }
0
a06113de4d67 first commit
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
163
55
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
164 /* Check vtables */
111
kono
parents: 67
diff changeset
165 for (member = CLASSTYPE_VTABLES (t);
kono
parents: 67
diff changeset
166 member; member = DECL_CHAIN (member))
55
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
167 if (TREE_CODE (member) == VAR_DECL)
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
168 maybe_add_dllimport (member);
0
a06113de4d67 first commit
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
169
55
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
170 /* We leave typeinfo tables alone. We can't mark TI objects as
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
171 dllimport, since the address of a secondary VTT may be needed
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
172 for static initialization of a primary VTT. VTT's of
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
173 dllimport'd classes should always be link-once COMDAT. */
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
174 }
0
a06113de4d67 first commit
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
175 }