1 /* Language-dependent hooks for C++.
2 Copyright 2001, 2002, 2004 Free Software Foundation, Inc.
3 Contributed by Alexandre Oliva <aoliva@redhat.com>
5 This file is part of GCC.
7 GCC 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 GCC 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 GCC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
24 #include "coretypes.h"
30 #include "langhooks.h"
31 #include "langhooks-def.h"
32 #include "diagnostic.h"
33 #include "cxx-pretty-print.h"
35 enum c_language_kind c_language = clk_cxx;
37 static HOST_WIDE_INT cxx_get_alias_set (tree);
38 static bool cxx_warn_unused_global_decl (tree);
39 static tree cp_expr_size (tree);
40 static size_t cp_tree_size (enum tree_code);
41 static bool cp_var_mod_type_p (tree);
42 static int cxx_types_compatible_p (tree, tree);
43 static void cxx_initialize_diagnostics (diagnostic_context *);
45 #undef LANG_HOOKS_NAME
46 #define LANG_HOOKS_NAME "GNU C++"
47 #undef LANG_HOOKS_TREE_SIZE
48 #define LANG_HOOKS_TREE_SIZE cp_tree_size
49 #undef LANG_HOOKS_INIT
50 #define LANG_HOOKS_INIT cxx_init
51 #undef LANG_HOOKS_FINISH
52 #define LANG_HOOKS_FINISH cxx_finish
53 #undef LANG_HOOKS_CLEAR_BINDING_STACK
54 #define LANG_HOOKS_CLEAR_BINDING_STACK pop_everything
55 #undef LANG_HOOKS_INIT_OPTIONS
56 #define LANG_HOOKS_INIT_OPTIONS c_common_init_options
57 #undef LANG_HOOKS_INITIALIZE_DIAGNOSTICS
58 #define LANG_HOOKS_INITIALIZE_DIAGNOSTICS cxx_initialize_diagnostics
59 #undef LANG_HOOKS_HANDLE_OPTION
60 #define LANG_HOOKS_HANDLE_OPTION c_common_handle_option
61 #undef LANG_HOOKS_HANDLE_FILENAME
62 #define LANG_HOOKS_HANDLE_FILENAME c_common_handle_filename
63 #undef LANG_HOOKS_MISSING_ARGUMENT
64 #define LANG_HOOKS_MISSING_ARGUMENT c_common_missing_argument
65 #undef LANG_HOOKS_POST_OPTIONS
66 #define LANG_HOOKS_POST_OPTIONS c_common_post_options
67 #undef LANG_HOOKS_GET_ALIAS_SET
68 #define LANG_HOOKS_GET_ALIAS_SET cxx_get_alias_set
69 #undef LANG_HOOKS_EXPAND_CONSTANT
70 #define LANG_HOOKS_EXPAND_CONSTANT cplus_expand_constant
71 #undef LANG_HOOKS_EXPAND_EXPR
72 #define LANG_HOOKS_EXPAND_EXPR cxx_expand_expr
73 #undef LANG_HOOKS_EXPAND_DECL
74 #define LANG_HOOKS_EXPAND_DECL c_expand_decl
75 #undef LANG_HOOKS_SAFE_FROM_P
76 #define LANG_HOOKS_SAFE_FROM_P c_safe_from_p
77 #undef LANG_HOOKS_PARSE_FILE
78 #define LANG_HOOKS_PARSE_FILE c_common_parse_file
79 #undef LANG_HOOKS_DUP_LANG_SPECIFIC_DECL
80 #define LANG_HOOKS_DUP_LANG_SPECIFIC_DECL cxx_dup_lang_specific_decl
81 #undef LANG_HOOKS_MAYBE_BUILD_CLEANUP
82 #define LANG_HOOKS_MAYBE_BUILD_CLEANUP cxx_maybe_build_cleanup
83 #undef LANG_HOOKS_TRUTHVALUE_CONVERSION
84 #define LANG_HOOKS_TRUTHVALUE_CONVERSION c_common_truthvalue_conversion
85 #undef LANG_HOOKS_UNSAFE_FOR_REEVAL
86 #define LANG_HOOKS_UNSAFE_FOR_REEVAL c_common_unsafe_for_reeval
87 #undef LANG_HOOKS_SET_DECL_ASSEMBLER_NAME
88 #define LANG_HOOKS_SET_DECL_ASSEMBLER_NAME mangle_decl
89 #undef LANG_HOOKS_MARK_ADDRESSABLE
90 #define LANG_HOOKS_MARK_ADDRESSABLE cxx_mark_addressable
91 #undef LANG_HOOKS_PRINT_STATISTICS
92 #define LANG_HOOKS_PRINT_STATISTICS cxx_print_statistics
93 #undef LANG_HOOKS_PRINT_XNODE
94 #define LANG_HOOKS_PRINT_XNODE cxx_print_xnode
95 #undef LANG_HOOKS_PRINT_DECL
96 #define LANG_HOOKS_PRINT_DECL cxx_print_decl
97 #undef LANG_HOOKS_PRINT_TYPE
98 #define LANG_HOOKS_PRINT_TYPE cxx_print_type
99 #undef LANG_HOOKS_PRINT_IDENTIFIER
100 #define LANG_HOOKS_PRINT_IDENTIFIER cxx_print_identifier
101 #undef LANG_HOOKS_DECL_PRINTABLE_NAME
102 #define LANG_HOOKS_DECL_PRINTABLE_NAME cxx_printable_name
103 #undef LANG_HOOKS_PRINT_ERROR_FUNCTION
104 #define LANG_HOOKS_PRINT_ERROR_FUNCTION cxx_print_error_function
105 #undef LANG_HOOKS_PUSHLEVEL
106 #define LANG_HOOKS_PUSHLEVEL lhd_do_nothing_i
107 #undef LANG_HOOKS_POPLEVEL
108 #define LANG_HOOKS_POPLEVEL lhd_do_nothing_iii_return_null_tree
109 #undef LANG_HOOKS_WARN_UNUSED_GLOBAL_DECL
110 #define LANG_HOOKS_WARN_UNUSED_GLOBAL_DECL cxx_warn_unused_global_decl
111 #undef LANG_HOOKS_WRITE_GLOBALS
112 #define LANG_HOOKS_WRITE_GLOBALS lhd_do_nothing
113 #undef LANG_HOOKS_UPDATE_DECL_AFTER_SAVING
114 #define LANG_HOOKS_UPDATE_DECL_AFTER_SAVING cp_update_decl_after_saving
117 #undef LANG_HOOKS_FUNCTION_INIT
118 #define LANG_HOOKS_FUNCTION_INIT cxx_push_function_context
119 #undef LANG_HOOKS_FUNCTION_FINAL
120 #define LANG_HOOKS_FUNCTION_FINAL cxx_pop_function_context
121 #undef LANG_HOOKS_FUNCTION_MISSING_NORETURN_OK_P
122 #define LANG_HOOKS_FUNCTION_MISSING_NORETURN_OK_P cp_missing_noreturn_ok_p
124 /* Attribute hooks. */
125 #undef LANG_HOOKS_COMMON_ATTRIBUTE_TABLE
126 #define LANG_HOOKS_COMMON_ATTRIBUTE_TABLE c_common_attribute_table
127 #undef LANG_HOOKS_FORMAT_ATTRIBUTE_TABLE
128 #define LANG_HOOKS_FORMAT_ATTRIBUTE_TABLE c_common_format_attribute_table
129 #undef LANG_HOOKS_ATTRIBUTE_TABLE
130 #define LANG_HOOKS_ATTRIBUTE_TABLE cxx_attribute_table
132 #undef LANG_HOOKS_TREE_INLINING_WALK_SUBTREES
133 #define LANG_HOOKS_TREE_INLINING_WALK_SUBTREES \
135 #undef LANG_HOOKS_TREE_INLINING_CANNOT_INLINE_TREE_FN
136 #define LANG_HOOKS_TREE_INLINING_CANNOT_INLINE_TREE_FN \
137 cp_cannot_inline_tree_fn
138 #undef LANG_HOOKS_TREE_INLINING_ADD_PENDING_FN_DECLS
139 #define LANG_HOOKS_TREE_INLINING_ADD_PENDING_FN_DECLS \
140 cp_add_pending_fn_decls
141 #undef LANG_HOOKS_TREE_INLINING_AUTO_VAR_IN_FN_P
142 #define LANG_HOOKS_TREE_INLINING_AUTO_VAR_IN_FN_P \
144 #undef LANG_HOOKS_TREE_INLINING_COPY_RES_DECL_FOR_INLINING
145 #define LANG_HOOKS_TREE_INLINING_COPY_RES_DECL_FOR_INLINING \
146 cp_copy_res_decl_for_inlining
147 #undef LANG_HOOKS_TREE_INLINING_ANON_AGGR_TYPE_P
148 #define LANG_HOOKS_TREE_INLINING_ANON_AGGR_TYPE_P anon_aggr_type_p
149 #undef LANG_HOOKS_TREE_INLINING_VAR_MOD_TYPE_P
150 #define LANG_HOOKS_TREE_INLINING_VAR_MOD_TYPE_P cp_var_mod_type_p
151 #undef LANG_HOOKS_TREE_DUMP_DUMP_TREE_FN
152 #define LANG_HOOKS_TREE_DUMP_DUMP_TREE_FN cp_dump_tree
153 #undef LANG_HOOKS_TREE_DUMP_TYPE_QUALS_FN
154 #define LANG_HOOKS_TREE_DUMP_TYPE_QUALS_FN cp_type_quals
155 #undef LANG_HOOKS_EXPR_SIZE
156 #define LANG_HOOKS_EXPR_SIZE cp_expr_size
158 #undef LANG_HOOKS_CALLGRAPH_ANALYZE_EXPR
159 #define LANG_HOOKS_CALLGRAPH_ANALYZE_EXPR cxx_callgraph_analyze_expr
160 #undef LANG_HOOKS_CALLGRAPH_EXPAND_FUNCTION
161 #define LANG_HOOKS_CALLGRAPH_EXPAND_FUNCTION expand_body
163 #undef LANG_HOOKS_MAKE_TYPE
164 #define LANG_HOOKS_MAKE_TYPE cxx_make_type
165 #undef LANG_HOOKS_TYPE_FOR_MODE
166 #define LANG_HOOKS_TYPE_FOR_MODE c_common_type_for_mode
167 #undef LANG_HOOKS_TYPE_FOR_SIZE
168 #define LANG_HOOKS_TYPE_FOR_SIZE c_common_type_for_size
169 #undef LANG_HOOKS_SIGNED_TYPE
170 #define LANG_HOOKS_SIGNED_TYPE c_common_signed_type
171 #undef LANG_HOOKS_UNSIGNED_TYPE
172 #define LANG_HOOKS_UNSIGNED_TYPE c_common_unsigned_type
173 #undef LANG_HOOKS_SIGNED_OR_UNSIGNED_TYPE
174 #define LANG_HOOKS_SIGNED_OR_UNSIGNED_TYPE c_common_signed_or_unsigned_type
175 #undef LANG_HOOKS_INCOMPLETE_TYPE_ERROR
176 #define LANG_HOOKS_INCOMPLETE_TYPE_ERROR cxx_incomplete_type_error
177 #undef LANG_HOOKS_TYPE_PROMOTES_TO
178 #define LANG_HOOKS_TYPE_PROMOTES_TO cxx_type_promotes_to
179 #undef LANG_HOOKS_TYPES_COMPATIBLE_P
180 #define LANG_HOOKS_TYPES_COMPATIBLE_P cxx_types_compatible_p
181 #undef LANG_HOOKS_REGISTER_BUILTIN_TYPE
182 #define LANG_HOOKS_REGISTER_BUILTIN_TYPE c_register_builtin_type
183 #undef LANG_HOOKS_GIMPLIFY_EXPR
184 #define LANG_HOOKS_GIMPLIFY_EXPR cp_gimplify_expr
185 #undef LANG_HOOKS_FOLD_OBJ_TYPE_REF
186 #define LANG_HOOKS_FOLD_OBJ_TYPE_REF cp_fold_obj_type_ref
188 /* Each front end provides its own hooks, for toplev.c. */
189 const struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER;
191 /* Tree code classes. */
193 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) TYPE,
195 const char tree_code_type[] = {
198 #include "c-common.def"
200 #include "cp-tree.def"
204 /* Table indexed by tree code giving number of expression
205 operands beyond the fixed part of the node structure.
206 Not used for types or decls. */
208 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) LENGTH,
210 const unsigned char tree_code_length[] = {
213 #include "c-common.def"
215 #include "cp-tree.def"
219 /* Names of tree components.
220 Used for printing out the tree and error messages. */
221 #define DEFTREECODE(SYM, NAME, TYPE, LEN) NAME,
223 const char *const tree_code_name[] = {
226 #include "c-common.def"
228 #include "cp-tree.def"
232 /* Special routine to get the alias set for C++. */
235 cxx_get_alias_set (tree t)
237 if (IS_FAKE_BASE_TYPE (t))
238 /* The base variant of a type must be in the same alias set as the
240 return get_alias_set (TYPE_CONTEXT (t));
242 /* Punt on PMFs until we canonicalize functions properly. */
243 if (TYPE_PTRMEMFUNC_P (t))
246 return c_common_get_alias_set (t);
249 /* Called from check_global_declarations. */
252 cxx_warn_unused_global_decl (tree decl)
254 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl))
256 if (DECL_IN_SYSTEM_HEADER (decl))
259 /* Const variables take the place of #defines in C++. */
260 if (TREE_CODE (decl) == VAR_DECL && TREE_READONLY (decl))
266 /* Langhook for expr_size: Tell the backend that the value of an expression
267 of non-POD class type does not include any tail padding; a derived class
268 might have allocated something there. */
271 cp_expr_size (tree exp)
273 if (CLASS_TYPE_P (TREE_TYPE (exp)))
275 /* The backend should not be interested in the size of an expression
276 of a type with both of these set; all copies of such types must go
277 through a constructor or assignment op. */
278 if (TYPE_HAS_COMPLEX_INIT_REF (TREE_TYPE (exp))
279 && TYPE_HAS_COMPLEX_ASSIGN_REF (TREE_TYPE (exp))
280 /* But storing a CONSTRUCTOR isn't a copy. */
281 && TREE_CODE (exp) != CONSTRUCTOR)
283 /* This would be wrong for a type with virtual bases, but they are
284 caught by the abort above. */
285 return (is_empty_class (TREE_TYPE (exp))
287 : CLASSTYPE_SIZE_UNIT (TREE_TYPE (exp)));
290 /* Use the default code. */
291 return lhd_expr_size (exp);
294 /* Langhook for tree_size: determine size of our 'x' and 'c' nodes. */
296 cp_tree_size (enum tree_code code)
300 case PTRMEM_CST: return sizeof (struct ptrmem_cst);
301 case BASELINK: return sizeof (struct tree_baselink);
302 case TEMPLATE_PARM_INDEX: return sizeof (template_parm_index);
303 case DEFAULT_ARG: return sizeof (struct tree_default_arg);
304 case OVERLOAD: return sizeof (struct tree_overload);
311 /* Returns true if T is a variably modified type, in the sense of C99.
312 This routine needs only check cases that cannot be handled by the
313 language-independent logic in tree-inline.c. */
316 cp_var_mod_type_p (tree type)
318 /* If TYPE is a pointer-to-member, it is variably modified if either
319 the class or the member are variably modified. */
320 if (TYPE_PTR_TO_MEMBER_P (type))
321 return (variably_modified_type_p (TYPE_PTRMEM_CLASS_TYPE (type))
322 || variably_modified_type_p (TYPE_PTRMEM_POINTED_TO_TYPE (type)));
324 /* All other types are not variably modified. */
328 static int cxx_types_compatible_p (tree x, tree y)
330 return same_type_ignoring_top_level_qualifiers_p (x, y);
333 /* Construct a C++-aware pretty-printer for CONTEXT. It is assumed
334 that CONTEXT->printer is an already constructed basic pretty_printer. */
336 cxx_initialize_diagnostics (diagnostic_context *context)
338 pretty_printer *base = context->printer;
339 cxx_pretty_printer *pp = xmalloc (sizeof (cxx_pretty_printer));
340 memcpy (pp_base (pp), base, sizeof (pretty_printer));
341 pp_cxx_pretty_printer_init (pp);
342 context->printer = (pretty_printer *) pp;
344 /* It is safe to free this object because it was previously malloc()'d. */
348 /* Stubs to keep c-opts.c happy. */
350 push_file_scope (void)
355 pop_file_scope (void)
359 /* c-pragma.c needs to query whether a decl has extern "C" linkage. */
361 has_c_linkage (tree decl)
363 return DECL_EXTERN_C_P (decl);