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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, 2007
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4 Free Software Foundation, Inc.
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5
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6 This file is part of GCC.
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7
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8 GCC is free software; you can redistribute it and/or modify it under
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9 the terms of the GNU General Public License as published by the Free
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10 Software Foundation; either version 3, or (at your option) any later
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11 version.
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12
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13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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16 for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with GCC; see the file COPYING3. If not see
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20 <http://www.gnu.org/licenses/>. */
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21
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22 #include "config.h"
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23 #include "system.h"
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24 #include "coretypes.h"
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25 #include "tm.h"
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26 #include "rtl.h"
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27 #include "regs.h"
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28 #include "hard-reg-set.h"
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29 #include "output.h"
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30 #include "tree.h"
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31 #include "cp/cp-tree.h" /* this is why we're a separate module */
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32 #include "flags.h"
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33 #include "tm_p.h"
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34 #include "toplev.h"
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35 #include "hashtab.h"
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36
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37 bool
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38 i386_pe_type_dllimport_p (tree decl)
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39 {
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40 gcc_assert (TREE_CODE (decl) == VAR_DECL
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41 || TREE_CODE (decl) == FUNCTION_DECL);
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42
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43 if (TARGET_NOP_FUN_DLLIMPORT && TREE_CODE (decl) == FUNCTION_DECL)
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44 return false;
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45
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46 /* We ignore the dllimport attribute for inline member functions.
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47 This differs from MSVC behavior which treats it like GNUC
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48 'extern inline' extension. Also ignore for template
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49 instantiations with linkonce semantics and artificial methods. */
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50 if (TREE_CODE (decl) == FUNCTION_DECL
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51 && (DECL_DECLARED_INLINE_P (decl)
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52 || DECL_TEMPLATE_INSTANTIATION (decl)
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53 || DECL_ARTIFICIAL (decl)))
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54 return false;
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55
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56
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57 /* Don't mark defined functions as dllimport. This code will only be
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58 reached if we see a non-inline function defined out-of-class. */
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59 else if (TREE_CODE (decl) == FUNCTION_DECL
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60 && (DECL_INITIAL (decl)))
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61 return false;
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62
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63 /* Don't allow definitions of static data members in dllimport class,
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64 If vtable data is marked as DECL_EXTERNAL, import it; otherwise just
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65 ignore the class attribute. */
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66 else if (TREE_CODE (decl) == VAR_DECL
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67 && TREE_STATIC (decl) && TREE_PUBLIC (decl)
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68 && !DECL_EXTERNAL (decl))
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69 {
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70 if (!DECL_VIRTUAL_P (decl))
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71 error ("definition of static data member %q+D of "
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72 "dllimport'd class", decl);
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73 return false;
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74 }
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75
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76 return true;
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77 }
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78
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79
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80 bool
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81 i386_pe_type_dllexport_p (tree decl)
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82 {
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83 gcc_assert (TREE_CODE (decl) == VAR_DECL
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84 || TREE_CODE (decl) == FUNCTION_DECL);
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85 /* Avoid exporting compiler-generated default dtors and copy ctors.
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86 The only artificial methods that need to be exported are virtual
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87 and non-virtual thunks. */
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88 if (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE
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89 && DECL_ARTIFICIAL (decl) && !DECL_THUNK_P (decl))
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90 return false;
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91 return true;
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92 }
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93
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94 static inline void maybe_add_dllimport (tree decl)
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95 {
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96 if (i386_pe_type_dllimport_p (decl))
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97 DECL_DLLIMPORT_P (decl) = 1;
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98 }
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99
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100 void
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101 i386_pe_adjust_class_at_definition (tree t)
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102 {
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103 tree member;
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104
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105 gcc_assert (CLASS_TYPE_P (t));
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106
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107 /* We only look at dllimport. The only thing that dllexport does is
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108 add stuff to a '.drectiv' section at end-of-file, so no need to do
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109 anything for dllexport'd classes until we generate RTL. */
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110 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (t)) == NULL_TREE)
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111 return;
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112
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113 /* We don't actually add the attribute to the decl, just set the flag
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114 that signals that the address of this symbol is not a compile-time
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115 constant. Any subsequent out-of-class declaration of members wil
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116 cause the DECL_DLLIMPORT_P flag to be unset.
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117 (See tree.c: merge_dllimport_decl_attributes).
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118 That is just right since out-of class declarations can only be a
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119 definition. We recheck the class members at RTL generation to
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120 emit warnings if this has happened. Definition of static data member
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121 of dllimport'd class always causes an error (as per MS compiler).
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122 */
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123
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124 /* Check static VAR_DECL's. */
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125 for (member = TYPE_FIELDS (t); member; member = TREE_CHAIN (member))
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126 if (TREE_CODE (member) == VAR_DECL)
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127 maybe_add_dllimport (member);
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128
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129 /* Check FUNCTION_DECL's. */
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130 for (member = TYPE_METHODS (t); member; member = TREE_CHAIN (member))
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131 if (TREE_CODE (member) == FUNCTION_DECL)
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132 maybe_add_dllimport (member);
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133
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134 /* Check vtables */
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135 for (member = CLASSTYPE_VTABLES (t); member; member = TREE_CHAIN (member))
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136 if (TREE_CODE (member) == VAR_DECL)
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137 maybe_add_dllimport (member);
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138
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139 /* We leave typeinfo tables alone. We can't mark TI objects as
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140 dllimport, since the address of a secondary VTT may be needed
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141 for static initialization of a primary VTT. VTT's of
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142 dllimport'd classes should always be link-once COMDAT. */
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143 }
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