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6c1e551f | 1 | /* Target support for C++ classes on Windows. |
2 | Contributed by Danny Smith (dannysmith@users.sourceforge.net) | |
92468061 | 3 | Copyright (C) 2005, 2007, 2009, 2010 Free Software Foundation, Inc. |
6c1e551f | 4 | |
5 | This file is part of GCC. | |
6 | ||
7 | GCC is free software; you can redistribute it and/or modify it under | |
8 | the terms of the GNU General Public License as published by the Free | |
038d1e19 | 9 | Software Foundation; either version 3, or (at your option) any later |
6c1e551f | 10 | version. |
11 | ||
12 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 | for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
038d1e19 | 18 | along with GCC; see the file COPYING3. If not see |
19 | <http://www.gnu.org/licenses/>. */ | |
2a323463 | 20 | |
6c1e551f | 21 | #include "config.h" |
22 | #include "system.h" | |
23 | #include "coretypes.h" | |
24 | #include "tm.h" | |
6c1e551f | 25 | #include "tree.h" |
f787a6a3 | 26 | #include "cp/cp-tree.h" /* This is why we're a separate module. */ |
6c1e551f | 27 | #include "flags.h" |
28 | #include "tm_p.h" | |
0b205f4c | 29 | #include "diagnostic-core.h" |
6c1e551f | 30 | #include "hashtab.h" |
31 | ||
32 | bool | |
33 | i386_pe_type_dllimport_p (tree decl) | |
34 | { | |
f5b1f90b | 35 | gcc_assert (TREE_CODE (decl) == VAR_DECL |
36 | || TREE_CODE (decl) == FUNCTION_DECL); | |
37 | ||
38 | if (TARGET_NOP_FUN_DLLIMPORT && TREE_CODE (decl) == FUNCTION_DECL) | |
39 | return false; | |
40 | ||
41 | /* We ignore the dllimport attribute for inline member functions. | |
42 | This differs from MSVC behavior which treats it like GNUC | |
43 | 'extern inline' extension. Also ignore for template | |
44 | instantiations with linkonce semantics and artificial methods. */ | |
45 | if (TREE_CODE (decl) == FUNCTION_DECL | |
46 | && (DECL_DECLARED_INLINE_P (decl) | |
47 | || DECL_TEMPLATE_INSTANTIATION (decl) | |
48 | || DECL_ARTIFICIAL (decl))) | |
49 | return false; | |
f787a6a3 | 50 | |
51 | /* Overrides of the class dllimport decls by out-of-class definitions are | |
52 | handled by tree.c:merge_dllimport_decl_attributes. */ | |
f5b1f90b | 53 | return true; |
6c1e551f | 54 | } |
55 | ||
6c1e551f | 56 | bool |
57 | i386_pe_type_dllexport_p (tree decl) | |
58 | { | |
f787a6a3 | 59 | gcc_assert (TREE_CODE (decl) == VAR_DECL |
60 | || TREE_CODE (decl) == FUNCTION_DECL); | |
61 | ||
62 | /* Avoid exporting compiler-generated default dtors and copy ctors. | |
63 | The only artificial methods that need to be exported are virtual | |
64 | and non-virtual thunks. */ | |
65 | if (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE | |
66 | && DECL_ARTIFICIAL (decl) && !DECL_THUNK_P (decl)) | |
67 | return false; | |
68 | return true; | |
6c1e551f | 69 | } |
70 | ||
71 | static inline void maybe_add_dllimport (tree decl) | |
72 | { | |
73 | if (i386_pe_type_dllimport_p (decl)) | |
f787a6a3 | 74 | DECL_DLLIMPORT_P (decl) = 1; |
75 | } | |
76 | ||
77 | static inline void maybe_add_dllexport (tree decl) | |
78 | { | |
79 | if (i386_pe_type_dllexport_p (decl)) | |
80 | { | |
81 | tree decl_attrs = DECL_ATTRIBUTES (decl); | |
82 | if (lookup_attribute ("dllexport", decl_attrs) != NULL_TREE) | |
83 | /* Already done. */ | |
84 | return; | |
85 | DECL_ATTRIBUTES (decl) = tree_cons (get_identifier ("dllexport"), | |
86 | NULL_TREE, decl_attrs); | |
87 | } | |
6c1e551f | 88 | } |
89 | ||
90 | void | |
91 | i386_pe_adjust_class_at_definition (tree t) | |
92 | { | |
93 | tree member; | |
94 | ||
95 | gcc_assert (CLASS_TYPE_P (t)); | |
f787a6a3 | 96 | |
97 | ||
98 | if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (t)) != NULL_TREE) | |
99 | { | |
100 | /* Check static VAR_DECL's. */ | |
1767a056 | 101 | for (member = TYPE_FIELDS (t); member; member = DECL_CHAIN (member)) |
f787a6a3 | 102 | if (TREE_CODE (member) == VAR_DECL) |
103 | maybe_add_dllexport (member); | |
104 | ||
105 | /* Check FUNCTION_DECL's. */ | |
1767a056 | 106 | for (member = TYPE_METHODS (t); member; member = DECL_CHAIN (member)) |
f787a6a3 | 107 | if (TREE_CODE (member) == FUNCTION_DECL) |
108 | { | |
109 | tree thunk; | |
110 | maybe_add_dllexport (member); | |
111 | ||
112 | /* Also add the attribute to its thunks. */ | |
113 | for (thunk = DECL_THUNKS (member); thunk; | |
114 | thunk = TREE_CHAIN (thunk)) | |
115 | maybe_add_dllexport (thunk); | |
116 | } | |
117 | /* Check vtables */ | |
1767a056 | 118 | for (member = CLASSTYPE_VTABLES (t); member; member = DECL_CHAIN (member)) |
f787a6a3 | 119 | if (TREE_CODE (member) == VAR_DECL) |
120 | maybe_add_dllexport (member); | |
121 | } | |
6c1e551f | 122 | |
f787a6a3 | 123 | else if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (t)) != NULL_TREE) |
124 | { | |
125 | /* We don't actually add the attribute to the decl, just set the flag | |
126 | that signals that the address of this symbol is not a compile-time | |
127 | constant. Any subsequent out-of-class declaration of members wil | |
128 | cause the DECL_DLLIMPORT_P flag to be unset. | |
129 | (See tree.c: merge_dllimport_decl_attributes). | |
130 | That is just right since out-of class declarations can only be a | |
131 | definition. */ | |
132 | ||
133 | /* Check static VAR_DECL's. */ | |
1767a056 | 134 | for (member = TYPE_FIELDS (t); member; member = DECL_CHAIN (member)) |
f787a6a3 | 135 | if (TREE_CODE (member) == VAR_DECL) |
136 | maybe_add_dllimport (member); | |
6c1e551f | 137 | |
f787a6a3 | 138 | /* Check FUNCTION_DECL's. */ |
1767a056 | 139 | for (member = TYPE_METHODS (t); member; member = DECL_CHAIN (member)) |
f787a6a3 | 140 | if (TREE_CODE (member) == FUNCTION_DECL) |
141 | { | |
142 | tree thunk; | |
143 | maybe_add_dllimport (member); | |
144 | ||
145 | /* Also add the attribute to its thunks. */ | |
146 | for (thunk = DECL_THUNKS (member); thunk; | |
1767a056 | 147 | thunk = DECL_CHAIN (thunk)) |
f787a6a3 | 148 | maybe_add_dllimport (thunk); |
149 | } | |
6c1e551f | 150 | |
f787a6a3 | 151 | /* Check vtables */ |
1767a056 | 152 | for (member = CLASSTYPE_VTABLES (t); member; member = DECL_CHAIN (member)) |
f787a6a3 | 153 | if (TREE_CODE (member) == VAR_DECL) |
154 | maybe_add_dllimport (member); | |
155 | ||
156 | /* We leave typeinfo tables alone. We can't mark TI objects as | |
157 | dllimport, since the address of a secondary VTT may be needed | |
158 | for static initialization of a primary VTT. VTT's of | |
159 | dllimport'd classes should always be link-once COMDAT. */ | |
160 | } | |
6c1e551f | 161 | } |