1 /* Target support for C++ classes on Windows.
2 Contributed by Danny Smith (dannysmith@users.sourceforge.net)
3 Copyright (C) 2005, 2007, 2009 Free Software Foundation, Inc.
5 This file is part of GCC.
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
9 Software Foundation; either version 3, or (at your option) any later
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
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
23 #include "coretypes.h"
27 #include "hard-reg-set.h"
30 #include "cp/cp-tree.h" /* This is why we're a separate module. */
37 i386_pe_type_dllimport_p (tree decl)
39 gcc_assert (TREE_CODE (decl) == VAR_DECL
40 || TREE_CODE (decl) == FUNCTION_DECL);
42 if (TARGET_NOP_FUN_DLLIMPORT && TREE_CODE (decl) == FUNCTION_DECL)
45 /* We ignore the dllimport attribute for inline member functions.
46 This differs from MSVC behavior which treats it like GNUC
47 'extern inline' extension. Also ignore for template
48 instantiations with linkonce semantics and artificial methods. */
49 if (TREE_CODE (decl) == FUNCTION_DECL
50 && (DECL_DECLARED_INLINE_P (decl)
51 || DECL_TEMPLATE_INSTANTIATION (decl)
52 || DECL_ARTIFICIAL (decl)))
55 /* Overrides of the class dllimport decls by out-of-class definitions are
56 handled by tree.c:merge_dllimport_decl_attributes. */
61 i386_pe_type_dllexport_p (tree decl)
63 gcc_assert (TREE_CODE (decl) == VAR_DECL
64 || TREE_CODE (decl) == FUNCTION_DECL);
66 /* Avoid exporting compiler-generated default dtors and copy ctors.
67 The only artificial methods that need to be exported are virtual
68 and non-virtual thunks. */
69 if (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE
70 && DECL_ARTIFICIAL (decl) && !DECL_THUNK_P (decl))
75 static inline void maybe_add_dllimport (tree decl)
77 if (i386_pe_type_dllimport_p (decl))
78 DECL_DLLIMPORT_P (decl) = 1;
81 static inline void maybe_add_dllexport (tree decl)
83 if (i386_pe_type_dllexport_p (decl))
85 tree decl_attrs = DECL_ATTRIBUTES (decl);
86 if (lookup_attribute ("dllexport", decl_attrs) != NULL_TREE)
89 DECL_ATTRIBUTES (decl) = tree_cons (get_identifier ("dllexport"),
90 NULL_TREE, decl_attrs);
95 i386_pe_adjust_class_at_definition (tree t)
99 gcc_assert (CLASS_TYPE_P (t));
102 if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (t)) != NULL_TREE)
104 /* Check static VAR_DECL's. */
105 for (member = TYPE_FIELDS (t); member; member = TREE_CHAIN (member))
106 if (TREE_CODE (member) == VAR_DECL)
107 maybe_add_dllexport (member);
109 /* Check FUNCTION_DECL's. */
110 for (member = TYPE_METHODS (t); member; member = TREE_CHAIN (member))
111 if (TREE_CODE (member) == FUNCTION_DECL)
114 maybe_add_dllexport (member);
116 /* Also add the attribute to its thunks. */
117 for (thunk = DECL_THUNKS (member); thunk;
118 thunk = TREE_CHAIN (thunk))
119 maybe_add_dllexport (thunk);
122 for (member = CLASSTYPE_VTABLES (t); member; member = TREE_CHAIN (member))
123 if (TREE_CODE (member) == VAR_DECL)
124 maybe_add_dllexport (member);
127 else if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (t)) != NULL_TREE)
129 /* We don't actually add the attribute to the decl, just set the flag
130 that signals that the address of this symbol is not a compile-time
131 constant. Any subsequent out-of-class declaration of members wil
132 cause the DECL_DLLIMPORT_P flag to be unset.
133 (See tree.c: merge_dllimport_decl_attributes).
134 That is just right since out-of class declarations can only be a
137 /* Check static VAR_DECL's. */
138 for (member = TYPE_FIELDS (t); member; member = TREE_CHAIN (member))
139 if (TREE_CODE (member) == VAR_DECL)
140 maybe_add_dllimport (member);
142 /* Check FUNCTION_DECL's. */
143 for (member = TYPE_METHODS (t); member; member = TREE_CHAIN (member))
144 if (TREE_CODE (member) == FUNCTION_DECL)
147 maybe_add_dllimport (member);
149 /* Also add the attribute to its thunks. */
150 for (thunk = DECL_THUNKS (member); thunk;
151 thunk = TREE_CHAIN (thunk))
152 maybe_add_dllimport (thunk);
156 for (member = CLASSTYPE_VTABLES (t); member; member = TREE_CHAIN (member))
157 if (TREE_CODE (member) == VAR_DECL)
158 maybe_add_dllimport (member);
160 /* We leave typeinfo tables alone. We can't mark TI objects as
161 dllimport, since the address of a secondary VTT may be needed
162 for static initialization of a primary VTT. VTT's of
163 dllimport'd classes should always be link-once COMDAT. */