1 /* Language-dependent hooks for C++.
2 Copyright 2001, 2002 Free Software Foundation, Inc.
3 Contributed by Alexandre Oliva <aoliva@redhat.com>
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
28 #include "langhooks.h"
29 #include "langhooks-def.h"
31 static HOST_WIDE_INT cxx_get_alias_set PARAMS ((tree));
32 static bool ok_to_generate_alias_set_for_type PARAMS ((tree));
33 static bool cxx_warn_unused_global_decl PARAMS ((tree));
35 #undef LANG_HOOKS_NAME
36 #define LANG_HOOKS_NAME "GNU C++"
37 #undef LANG_HOOKS_INIT
38 #define LANG_HOOKS_INIT cxx_init
39 #undef LANG_HOOKS_FINISH
40 #define LANG_HOOKS_FINISH cxx_finish
41 #undef LANG_HOOKS_CLEAR_BINDING_STACK
42 #define LANG_HOOKS_CLEAR_BINDING_STACK pop_everything
43 #undef LANG_HOOKS_INIT_OPTIONS
44 #define LANG_HOOKS_INIT_OPTIONS cxx_init_options
45 #undef LANG_HOOKS_DECODE_OPTION
46 #define LANG_HOOKS_DECODE_OPTION cxx_decode_option
47 #undef LANG_HOOKS_POST_OPTIONS
48 #define LANG_HOOKS_POST_OPTIONS c_common_post_options
49 #undef LANG_HOOKS_GET_ALIAS_SET
50 #define LANG_HOOKS_GET_ALIAS_SET cxx_get_alias_set
51 #undef LANG_HOOKS_EXPAND_CONSTANT
52 #define LANG_HOOKS_EXPAND_CONSTANT cplus_expand_constant
53 #undef LANG_HOOKS_EXPAND_EXPR
54 #define LANG_HOOKS_EXPAND_EXPR cxx_expand_expr
55 #undef LANG_HOOKS_SAFE_FROM_P
56 #define LANG_HOOKS_SAFE_FROM_P c_safe_from_p
57 #undef LANG_HOOKS_PARSE_FILE
58 #define LANG_HOOKS_PARSE_FILE c_common_parse_file
59 #undef LANG_HOOKS_DUP_LANG_SPECIFIC_DECL
60 #define LANG_HOOKS_DUP_LANG_SPECIFIC_DECL cxx_dup_lang_specific_decl
61 #undef LANG_HOOKS_UNSAVE_EXPR_NOW
62 #define LANG_HOOKS_UNSAVE_EXPR_NOW cxx_unsave_expr_now
63 #undef LANG_HOOKS_MAYBE_BUILD_CLEANUP
64 #define LANG_HOOKS_MAYBE_BUILD_CLEANUP cxx_maybe_build_cleanup
65 #undef LANG_HOOKS_TRUTHVALUE_CONVERSION
66 #define LANG_HOOKS_TRUTHVALUE_CONVERSION c_common_truthvalue_conversion
67 #undef LANG_HOOKS_INSERT_DEFAULT_ATTRIBUTES
68 #define LANG_HOOKS_INSERT_DEFAULT_ATTRIBUTES cxx_insert_default_attributes
69 #undef LANG_HOOKS_UNSAFE_FOR_REEVAL
70 #define LANG_HOOKS_UNSAFE_FOR_REEVAL c_common_unsafe_for_reeval
71 #undef LANG_HOOKS_SET_DECL_ASSEMBLER_NAME
72 #define LANG_HOOKS_SET_DECL_ASSEMBLER_NAME mangle_decl
73 #undef LANG_HOOKS_MARK_ADDRESSABLE
74 #define LANG_HOOKS_MARK_ADDRESSABLE cxx_mark_addressable
75 #undef LANG_HOOKS_PRINT_STATISTICS
76 #define LANG_HOOKS_PRINT_STATISTICS cxx_print_statistics
77 #undef LANG_HOOKS_PRINT_XNODE
78 #define LANG_HOOKS_PRINT_XNODE cxx_print_xnode
79 #undef LANG_HOOKS_PRINT_DECL
80 #define LANG_HOOKS_PRINT_DECL cxx_print_decl
81 #undef LANG_HOOKS_PRINT_TYPE
82 #define LANG_HOOKS_PRINT_TYPE cxx_print_type
83 #undef LANG_HOOKS_PRINT_IDENTIFIER
84 #define LANG_HOOKS_PRINT_IDENTIFIER cxx_print_identifier
85 #undef LANG_HOOKS_DECL_PRINTABLE_NAME
86 #define LANG_HOOKS_DECL_PRINTABLE_NAME cxx_printable_name
87 #undef LANG_HOOKS_PRINT_ERROR_FUNCTION
88 #define LANG_HOOKS_PRINT_ERROR_FUNCTION cxx_print_error_function
89 #undef LANG_HOOKS_WARN_UNUSED_GLOBAL_DECL
90 #define LANG_HOOKS_WARN_UNUSED_GLOBAL_DECL cxx_warn_unused_global_decl
92 #undef LANG_HOOKS_FUNCTION_INIT
93 #define LANG_HOOKS_FUNCTION_INIT cxx_push_function_context
94 #undef LANG_HOOKS_FUNCTION_FINAL
95 #define LANG_HOOKS_FUNCTION_FINAL cxx_pop_function_context
97 /* Attribute hooks. */
98 #undef LANG_HOOKS_COMMON_ATTRIBUTE_TABLE
99 #define LANG_HOOKS_COMMON_ATTRIBUTE_TABLE c_common_attribute_table
100 #undef LANG_HOOKS_FORMAT_ATTRIBUTE_TABLE
101 #define LANG_HOOKS_FORMAT_ATTRIBUTE_TABLE c_common_format_attribute_table
102 #undef LANG_HOOKS_ATTRIBUTE_TABLE
103 #define LANG_HOOKS_ATTRIBUTE_TABLE cxx_attribute_table
105 #undef LANG_HOOKS_TREE_INLINING_WALK_SUBTREES
106 #define LANG_HOOKS_TREE_INLINING_WALK_SUBTREES \
108 #undef LANG_HOOKS_TREE_INLINING_CANNOT_INLINE_TREE_FN
109 #define LANG_HOOKS_TREE_INLINING_CANNOT_INLINE_TREE_FN \
110 cp_cannot_inline_tree_fn
111 #undef LANG_HOOKS_TREE_INLINING_ADD_PENDING_FN_DECLS
112 #define LANG_HOOKS_TREE_INLINING_ADD_PENDING_FN_DECLS \
113 cp_add_pending_fn_decls
114 #undef LANG_HOOKS_TREE_INLINING_TREE_CHAIN_MATTERS_P
115 #define LANG_HOOKS_TREE_INLINING_TREE_CHAIN_MATTERS_P \
117 #undef LANG_HOOKS_TREE_INLINING_AUTO_VAR_IN_FN_P
118 #define LANG_HOOKS_TREE_INLINING_AUTO_VAR_IN_FN_P \
120 #undef LANG_HOOKS_TREE_INLINING_COPY_RES_DECL_FOR_INLINING
121 #define LANG_HOOKS_TREE_INLINING_COPY_RES_DECL_FOR_INLINING \
122 cp_copy_res_decl_for_inlining
123 #undef LANG_HOOKS_TREE_INLINING_CONVERT_PARM_FOR_INLINING
124 #define LANG_HOOKS_TREE_INLINING_CONVERT_PARM_FOR_INLINING \
125 cp_convert_parm_for_inlining
126 #undef LANG_HOOKS_TREE_INLINING_ANON_AGGR_TYPE_P
127 #define LANG_HOOKS_TREE_INLINING_ANON_AGGR_TYPE_P anon_aggr_type_p
128 #undef LANG_HOOKS_TREE_INLINING_START_INLINING
129 #define LANG_HOOKS_TREE_INLINING_START_INLINING cp_start_inlining
130 #undef LANG_HOOKS_TREE_INLINING_END_INLINING
131 #define LANG_HOOKS_TREE_INLINING_END_INLINING cp_end_inlining
132 #undef LANG_HOOKS_TREE_DUMP_DUMP_TREE_FN
133 #define LANG_HOOKS_TREE_DUMP_DUMP_TREE_FN cp_dump_tree
134 #undef LANG_HOOKS_TREE_DUMP_TYPE_QUALS_FN
135 #define LANG_HOOKS_TREE_DUMP_TYPE_QUALS_FN cp_type_quals
137 #undef LANG_HOOKS_MAKE_TYPE
138 #define LANG_HOOKS_MAKE_TYPE cxx_make_type
139 #undef LANG_HOOKS_TYPE_FOR_MODE
140 #define LANG_HOOKS_TYPE_FOR_MODE c_common_type_for_mode
141 #undef LANG_HOOKS_TYPE_FOR_SIZE
142 #define LANG_HOOKS_TYPE_FOR_SIZE c_common_type_for_size
143 #undef LANG_HOOKS_SIGNED_TYPE
144 #define LANG_HOOKS_SIGNED_TYPE c_common_signed_type
145 #undef LANG_HOOKS_UNSIGNED_TYPE
146 #define LANG_HOOKS_UNSIGNED_TYPE c_common_unsigned_type
147 #undef LANG_HOOKS_SIGNED_OR_UNSIGNED_TYPE
148 #define LANG_HOOKS_SIGNED_OR_UNSIGNED_TYPE c_common_signed_or_unsigned_type
149 #undef LANG_HOOKS_INCOMPLETE_TYPE_ERROR
150 #define LANG_HOOKS_INCOMPLETE_TYPE_ERROR cxx_incomplete_type_error
151 #undef LANG_HOOKS_TYPE_PROMOTES_TO
152 #define LANG_HOOKS_TYPE_PROMOTES_TO cxx_type_promotes_to
154 /* Each front end provides its own hooks, for toplev.c. */
155 const struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER;
157 /* Tree code classes. */
159 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) TYPE,
161 const char tree_code_type[] = {
164 #include "c-common.def"
166 #include "cp-tree.def"
170 /* Table indexed by tree code giving number of expression
171 operands beyond the fixed part of the node structure.
172 Not used for types or decls. */
174 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) LENGTH,
176 const unsigned char tree_code_length[] = {
179 #include "c-common.def"
181 #include "cp-tree.def"
185 /* Names of tree components.
186 Used for printing out the tree and error messages. */
187 #define DEFTREECODE(SYM, NAME, TYPE, LEN) NAME,
189 const char *const tree_code_name[] = {
192 #include "c-common.def"
194 #include "cp-tree.def"
198 /* Check if a C++ type is safe for aliasing.
199 Return TRUE if T safe for aliasing FALSE otherwise. */
202 ok_to_generate_alias_set_for_type (t)
205 if (TYPE_PTRMEMFUNC_P (t))
207 if (AGGREGATE_TYPE_P (t))
209 if ((TREE_CODE (t) == RECORD_TYPE) || (TREE_CODE (t) == UNION_TYPE))
212 /* Backend-created structs are safe. */
213 if (! CLASS_TYPE_P (t))
216 if (! CLASSTYPE_NON_POD_P(t))
218 /* Classes with virtual baseclasses are not. */
219 if (TYPE_USES_VIRTUAL_BASECLASSES (t))
221 /* Recursively check the base classes. */
222 if (TYPE_BINFO (t) != NULL && TYPE_BINFO_BASETYPES (t) != NULL)
225 for (i = 0; i < TREE_VEC_LENGTH (TYPE_BINFO_BASETYPES (t)); i++)
227 tree binfo = TREE_VEC_ELT (TYPE_BINFO_BASETYPES (t), i);
228 if (!ok_to_generate_alias_set_for_type (BINFO_TYPE (binfo)))
232 /* Check all the fields. */
233 for (fields = TYPE_FIELDS (t); fields; fields = TREE_CHAIN (fields))
235 if (TREE_CODE (fields) != FIELD_DECL)
237 if (! ok_to_generate_alias_set_for_type (TREE_TYPE (fields)))
242 else if (TREE_CODE (t) == ARRAY_TYPE)
243 return ok_to_generate_alias_set_for_type (TREE_TYPE (t));
245 /* This should never happen, we dealt with all the aggregate
246 types that can appear in C++ above. */
253 /* Special routine to get the alias set for C++. */
256 cxx_get_alias_set (t)
259 /* It's not yet safe to use alias sets for classes in C++. */
260 if (!ok_to_generate_alias_set_for_type(t))
263 return c_common_get_alias_set (t);
266 /* Called from check_global_declarations. */
269 cxx_warn_unused_global_decl (decl)
272 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl))
274 if (DECL_IN_SYSTEM_HEADER (decl))
277 /* Const variables take the place of #defines in C++. */
278 if (TREE_CODE (decl) == VAR_DECL && TREE_READONLY (decl))