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 ok_to_generate_alias_set_for_type (tree
);
39 static bool cxx_warn_unused_global_decl (tree
);
40 static tree
cp_expr_size (tree
);
41 static size_t cp_tree_size (enum tree_code
);
42 static bool cp_var_mod_type_p (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_SAFE_FROM_P
74 #define LANG_HOOKS_SAFE_FROM_P c_safe_from_p
75 #undef LANG_HOOKS_PARSE_FILE
76 #define LANG_HOOKS_PARSE_FILE c_common_parse_file
77 #undef LANG_HOOKS_DUP_LANG_SPECIFIC_DECL
78 #define LANG_HOOKS_DUP_LANG_SPECIFIC_DECL cxx_dup_lang_specific_decl
79 #undef LANG_HOOKS_UNSAVE_EXPR_NOW
80 #define LANG_HOOKS_UNSAVE_EXPR_NOW cxx_unsave_expr_now
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_DECL_UNINIT
114 #define LANG_HOOKS_DECL_UNINIT c_decl_uninit
115 #undef LANG_HOOKS_UPDATE_DECL_AFTER_SAVING
116 #define LANG_HOOKS_UPDATE_DECL_AFTER_SAVING cp_update_decl_after_saving
119 #undef LANG_HOOKS_FUNCTION_INIT
120 #define LANG_HOOKS_FUNCTION_INIT cxx_push_function_context
121 #undef LANG_HOOKS_FUNCTION_FINAL
122 #define LANG_HOOKS_FUNCTION_FINAL cxx_pop_function_context
124 #undef LANG_HOOKS_RTL_EXPAND_START
125 #define LANG_HOOKS_RTL_EXPAND_START cxx_expand_function_start
126 #undef LANG_HOOKS_RTL_EXPAND_STMT
127 #define LANG_HOOKS_RTL_EXPAND_STMT expand_stmt
129 /* Attribute hooks. */
130 #undef LANG_HOOKS_COMMON_ATTRIBUTE_TABLE
131 #define LANG_HOOKS_COMMON_ATTRIBUTE_TABLE c_common_attribute_table
132 #undef LANG_HOOKS_FORMAT_ATTRIBUTE_TABLE
133 #define LANG_HOOKS_FORMAT_ATTRIBUTE_TABLE c_common_format_attribute_table
134 #undef LANG_HOOKS_ATTRIBUTE_TABLE
135 #define LANG_HOOKS_ATTRIBUTE_TABLE cxx_attribute_table
137 #undef LANG_HOOKS_TREE_INLINING_WALK_SUBTREES
138 #define LANG_HOOKS_TREE_INLINING_WALK_SUBTREES \
140 #undef LANG_HOOKS_TREE_INLINING_CANNOT_INLINE_TREE_FN
141 #define LANG_HOOKS_TREE_INLINING_CANNOT_INLINE_TREE_FN \
142 cp_cannot_inline_tree_fn
143 #undef LANG_HOOKS_TREE_INLINING_ADD_PENDING_FN_DECLS
144 #define LANG_HOOKS_TREE_INLINING_ADD_PENDING_FN_DECLS \
145 cp_add_pending_fn_decls
146 #undef LANG_HOOKS_TREE_INLINING_TREE_CHAIN_MATTERS_P
147 #define LANG_HOOKS_TREE_INLINING_TREE_CHAIN_MATTERS_P \
149 #undef LANG_HOOKS_TREE_INLINING_AUTO_VAR_IN_FN_P
150 #define LANG_HOOKS_TREE_INLINING_AUTO_VAR_IN_FN_P \
152 #undef LANG_HOOKS_TREE_INLINING_COPY_RES_DECL_FOR_INLINING
153 #define LANG_HOOKS_TREE_INLINING_COPY_RES_DECL_FOR_INLINING \
154 cp_copy_res_decl_for_inlining
155 #undef LANG_HOOKS_TREE_INLINING_ANON_AGGR_TYPE_P
156 #define LANG_HOOKS_TREE_INLINING_ANON_AGGR_TYPE_P anon_aggr_type_p
157 #undef LANG_HOOKS_TREE_INLINING_VAR_MOD_TYPE_P
158 #define LANG_HOOKS_TREE_INLINING_VAR_MOD_TYPE_P cp_var_mod_type_p
159 #undef LANG_HOOKS_TREE_INLINING_ESTIMATE_NUM_INSNS
160 #define LANG_HOOKS_TREE_INLINING_ESTIMATE_NUM_INSNS c_estimate_num_insns
161 #undef LANG_HOOKS_TREE_DUMP_DUMP_TREE_FN
162 #define LANG_HOOKS_TREE_DUMP_DUMP_TREE_FN cp_dump_tree
163 #undef LANG_HOOKS_TREE_DUMP_TYPE_QUALS_FN
164 #define LANG_HOOKS_TREE_DUMP_TYPE_QUALS_FN cp_type_quals
165 #undef LANG_HOOKS_EXPR_SIZE
166 #define LANG_HOOKS_EXPR_SIZE cp_expr_size
168 #undef LANG_HOOKS_CALLGRAPH_ANALYZE_EXPR
169 #define LANG_HOOKS_CALLGRAPH_ANALYZE_EXPR cxx_callgraph_analyze_expr
170 #undef LANG_HOOKS_CALLGRAPH_EXPAND_FUNCTION
171 #define LANG_HOOKS_CALLGRAPH_EXPAND_FUNCTION expand_body
173 #undef LANG_HOOKS_MAKE_TYPE
174 #define LANG_HOOKS_MAKE_TYPE cxx_make_type
175 #undef LANG_HOOKS_TYPE_FOR_MODE
176 #define LANG_HOOKS_TYPE_FOR_MODE c_common_type_for_mode
177 #undef LANG_HOOKS_TYPE_FOR_SIZE
178 #define LANG_HOOKS_TYPE_FOR_SIZE c_common_type_for_size
179 #undef LANG_HOOKS_SIGNED_TYPE
180 #define LANG_HOOKS_SIGNED_TYPE c_common_signed_type
181 #undef LANG_HOOKS_UNSIGNED_TYPE
182 #define LANG_HOOKS_UNSIGNED_TYPE c_common_unsigned_type
183 #undef LANG_HOOKS_SIGNED_OR_UNSIGNED_TYPE
184 #define LANG_HOOKS_SIGNED_OR_UNSIGNED_TYPE c_common_signed_or_unsigned_type
185 #undef LANG_HOOKS_INCOMPLETE_TYPE_ERROR
186 #define LANG_HOOKS_INCOMPLETE_TYPE_ERROR cxx_incomplete_type_error
187 #undef LANG_HOOKS_TYPE_PROMOTES_TO
188 #define LANG_HOOKS_TYPE_PROMOTES_TO cxx_type_promotes_to
189 #undef LANG_HOOKS_REGISTER_BUILTIN_TYPE
190 #define LANG_HOOKS_REGISTER_BUILTIN_TYPE c_register_builtin_type
192 /* Each front end provides its own hooks, for toplev.c. */
193 const struct lang_hooks lang_hooks
= LANG_HOOKS_INITIALIZER
;
195 /* Tree code classes. */
197 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) TYPE,
199 const char tree_code_type
[] = {
202 #include "c-common.def"
204 #include "cp-tree.def"
208 /* Table indexed by tree code giving number of expression
209 operands beyond the fixed part of the node structure.
210 Not used for types or decls. */
212 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) LENGTH,
214 const unsigned char tree_code_length
[] = {
217 #include "c-common.def"
219 #include "cp-tree.def"
223 /* Names of tree components.
224 Used for printing out the tree and error messages. */
225 #define DEFTREECODE(SYM, NAME, TYPE, LEN) NAME,
227 const char *const tree_code_name
[] = {
230 #include "c-common.def"
232 #include "cp-tree.def"
236 /* Check if a C++ type is safe for aliasing.
237 Return TRUE if T safe for aliasing FALSE otherwise. */
240 ok_to_generate_alias_set_for_type (tree t
)
242 if (TYPE_PTRMEMFUNC_P (t
))
244 if (AGGREGATE_TYPE_P (t
))
246 if ((TREE_CODE (t
) == RECORD_TYPE
) || (TREE_CODE (t
) == UNION_TYPE
))
249 /* Backend-created structs are safe. */
250 if (! CLASS_TYPE_P (t
))
253 if (! CLASSTYPE_NON_POD_P(t
))
255 /* Classes with virtual baseclasses are not. */
256 if (TYPE_USES_VIRTUAL_BASECLASSES (t
))
258 /* Recursively check the base classes. */
259 if (TYPE_BINFO (t
) != NULL
&& TYPE_BINFO_BASETYPES (t
) != NULL
)
262 for (i
= 0; i
< TREE_VEC_LENGTH (TYPE_BINFO_BASETYPES (t
)); i
++)
264 tree binfo
= TREE_VEC_ELT (TYPE_BINFO_BASETYPES (t
), i
);
265 if (!ok_to_generate_alias_set_for_type (BINFO_TYPE (binfo
)))
269 /* Check all the fields. */
270 for (fields
= TYPE_FIELDS (t
); fields
; fields
= TREE_CHAIN (fields
))
272 if (TREE_CODE (fields
) != FIELD_DECL
)
274 if (! ok_to_generate_alias_set_for_type (TREE_TYPE (fields
)))
279 else if (TREE_CODE (t
) == ARRAY_TYPE
)
280 return ok_to_generate_alias_set_for_type (TREE_TYPE (t
));
282 /* This should never happen, we dealt with all the aggregate
283 types that can appear in C++ above. */
290 /* Special routine to get the alias set for C++. */
293 cxx_get_alias_set (tree t
)
295 if (TREE_CODE (t
) == RECORD_TYPE
296 && TYPE_CONTEXT (t
) && CLASS_TYPE_P (TYPE_CONTEXT (t
))
297 && CLASSTYPE_AS_BASE (TYPE_CONTEXT (t
)) == t
)
298 /* The base variant of a type must be in the same alias set as the
300 return get_alias_set (TYPE_CONTEXT (t
));
302 if (/* It's not yet safe to use alias sets for some classes in C++. */
303 !ok_to_generate_alias_set_for_type (t
)
304 /* Nor is it safe to use alias sets for pointers-to-member
305 functions, due to the fact that there may be more than one
306 RECORD_TYPE type corresponding to the same pointer-to-member
308 || TYPE_PTRMEMFUNC_P (t
))
311 return c_common_get_alias_set (t
);
314 /* Called from check_global_declarations. */
317 cxx_warn_unused_global_decl (tree decl
)
319 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_DECLARED_INLINE_P (decl
))
321 if (DECL_IN_SYSTEM_HEADER (decl
))
324 /* Const variables take the place of #defines in C++. */
325 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_READONLY (decl
))
331 /* Langhook for expr_size: Tell the backend that the value of an expression
332 of non-POD class type does not include any tail padding; a derived class
333 might have allocated something there. */
336 cp_expr_size (tree exp
)
338 if (CLASS_TYPE_P (TREE_TYPE (exp
)))
340 /* The backend should not be interested in the size of an expression
341 of a type with both of these set; all copies of such types must go
342 through a constructor or assignment op. */
343 if (TYPE_HAS_COMPLEX_INIT_REF (TREE_TYPE (exp
))
344 && TYPE_HAS_COMPLEX_ASSIGN_REF (TREE_TYPE (exp
))
345 /* But storing a CONSTRUCTOR isn't a copy. */
346 && TREE_CODE (exp
) != CONSTRUCTOR
)
348 /* This would be wrong for a type with virtual bases, but they are
349 caught by the abort above. */
350 return (is_empty_class (TREE_TYPE (exp
))
352 : CLASSTYPE_SIZE_UNIT (TREE_TYPE (exp
)));
355 /* Use the default code. */
356 return lhd_expr_size (exp
);
359 /* Langhook for tree_size: determine size of our 'x' and 'c' nodes. */
361 cp_tree_size (enum tree_code code
)
365 case PTRMEM_CST
: return sizeof (struct ptrmem_cst
);
366 case BASELINK
: return sizeof (struct tree_baselink
);
367 case TEMPLATE_PARM_INDEX
: return sizeof (template_parm_index
);
368 case DEFAULT_ARG
: return sizeof (struct tree_default_arg
);
369 case OVERLOAD
: return sizeof (struct tree_overload
);
376 /* Returns true if T is a variably modified type, in the sense of C99.
377 This routine needs only check cases that cannot be handled by the
378 language-independent logic in tree-inline.c. */
381 cp_var_mod_type_p (tree type
)
383 /* If TYPE is a pointer-to-member, it is variably modified if either
384 the class or the member are variably modified. */
385 if (TYPE_PTR_TO_MEMBER_P (type
))
386 return (variably_modified_type_p (TYPE_PTRMEM_CLASS_TYPE (type
))
387 || variably_modified_type_p (TYPE_PTRMEM_POINTED_TO_TYPE (type
)));
389 /* All other types are not variably modified. */
393 /* Construct a C++-aware pretty-printer for CONTEXT. It is assumed
394 that CONTEXT->printer is an already constructed basic pretty_printer. */
396 cxx_initialize_diagnostics (diagnostic_context
*context
)
398 pretty_printer
*base
= context
->printer
;
399 cxx_pretty_printer
*pp
= xmalloc (sizeof (cxx_pretty_printer
));
400 memcpy (pp_base (pp
), base
, sizeof (pretty_printer
));
401 pp_cxx_pretty_printer_init (pp
);
402 context
->printer
= (pretty_printer
*) pp
;
404 /* It is safe to free this object because it was previously malloc()'d. */
408 /* Stubs to keep c-opts.c happy. */
410 push_file_scope (void)
415 pop_file_scope (void)