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, 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_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_TRUTHVALUE_CONVERSION
80 #define LANG_HOOKS_TRUTHVALUE_CONVERSION c_common_truthvalue_conversion
81 #undef LANG_HOOKS_SET_DECL_ASSEMBLER_NAME
82 #define LANG_HOOKS_SET_DECL_ASSEMBLER_NAME mangle_decl
83 #undef LANG_HOOKS_MARK_ADDRESSABLE
84 #define LANG_HOOKS_MARK_ADDRESSABLE cxx_mark_addressable
85 #undef LANG_HOOKS_PRINT_STATISTICS
86 #define LANG_HOOKS_PRINT_STATISTICS cxx_print_statistics
87 #undef LANG_HOOKS_PRINT_XNODE
88 #define LANG_HOOKS_PRINT_XNODE cxx_print_xnode
89 #undef LANG_HOOKS_PRINT_DECL
90 #define LANG_HOOKS_PRINT_DECL cxx_print_decl
91 #undef LANG_HOOKS_PRINT_TYPE
92 #define LANG_HOOKS_PRINT_TYPE cxx_print_type
93 #undef LANG_HOOKS_PRINT_IDENTIFIER
94 #define LANG_HOOKS_PRINT_IDENTIFIER cxx_print_identifier
95 #undef LANG_HOOKS_DECL_PRINTABLE_NAME
96 #define LANG_HOOKS_DECL_PRINTABLE_NAME cxx_printable_name
97 #undef LANG_HOOKS_PRINT_ERROR_FUNCTION
98 #define LANG_HOOKS_PRINT_ERROR_FUNCTION cxx_print_error_function
99 #undef LANG_HOOKS_WARN_UNUSED_GLOBAL_DECL
100 #define LANG_HOOKS_WARN_UNUSED_GLOBAL_DECL cxx_warn_unused_global_decl
101 #undef LANG_HOOKS_WRITE_GLOBALS
102 #define LANG_HOOKS_WRITE_GLOBALS lhd_do_nothing
105 #undef LANG_HOOKS_FUNCTION_INIT
106 #define LANG_HOOKS_FUNCTION_INIT cxx_push_function_context
107 #undef LANG_HOOKS_FUNCTION_FINAL
108 #define LANG_HOOKS_FUNCTION_FINAL cxx_pop_function_context
109 #undef LANG_HOOKS_FUNCTION_MISSING_NORETURN_OK_P
110 #define LANG_HOOKS_FUNCTION_MISSING_NORETURN_OK_P cp_missing_noreturn_ok_p
112 /* Attribute hooks. */
113 #undef LANG_HOOKS_COMMON_ATTRIBUTE_TABLE
114 #define LANG_HOOKS_COMMON_ATTRIBUTE_TABLE c_common_attribute_table
115 #undef LANG_HOOKS_FORMAT_ATTRIBUTE_TABLE
116 #define LANG_HOOKS_FORMAT_ATTRIBUTE_TABLE c_common_format_attribute_table
117 #undef LANG_HOOKS_ATTRIBUTE_TABLE
118 #define LANG_HOOKS_ATTRIBUTE_TABLE cxx_attribute_table
120 #undef LANG_HOOKS_TREE_INLINING_WALK_SUBTREES
121 #define LANG_HOOKS_TREE_INLINING_WALK_SUBTREES \
123 #undef LANG_HOOKS_TREE_INLINING_CANNOT_INLINE_TREE_FN
124 #define LANG_HOOKS_TREE_INLINING_CANNOT_INLINE_TREE_FN \
125 cp_cannot_inline_tree_fn
126 #undef LANG_HOOKS_TREE_INLINING_ADD_PENDING_FN_DECLS
127 #define LANG_HOOKS_TREE_INLINING_ADD_PENDING_FN_DECLS \
128 cp_add_pending_fn_decls
129 #undef LANG_HOOKS_TREE_INLINING_AUTO_VAR_IN_FN_P
130 #define LANG_HOOKS_TREE_INLINING_AUTO_VAR_IN_FN_P \
132 #undef LANG_HOOKS_TREE_INLINING_ANON_AGGR_TYPE_P
133 #define LANG_HOOKS_TREE_INLINING_ANON_AGGR_TYPE_P anon_aggr_type_p
134 #undef LANG_HOOKS_TREE_INLINING_VAR_MOD_TYPE_P
135 #define LANG_HOOKS_TREE_INLINING_VAR_MOD_TYPE_P cp_var_mod_type_p
136 #undef LANG_HOOKS_TREE_DUMP_DUMP_TREE_FN
137 #define LANG_HOOKS_TREE_DUMP_DUMP_TREE_FN cp_dump_tree
138 #undef LANG_HOOKS_TREE_DUMP_TYPE_QUALS_FN
139 #define LANG_HOOKS_TREE_DUMP_TYPE_QUALS_FN cp_type_quals
140 #undef LANG_HOOKS_EXPR_SIZE
141 #define LANG_HOOKS_EXPR_SIZE cp_expr_size
143 #undef LANG_HOOKS_CALLGRAPH_ANALYZE_EXPR
144 #define LANG_HOOKS_CALLGRAPH_ANALYZE_EXPR cxx_callgraph_analyze_expr
145 #undef LANG_HOOKS_CALLGRAPH_EXPAND_FUNCTION
146 #define LANG_HOOKS_CALLGRAPH_EXPAND_FUNCTION expand_body
148 #undef LANG_HOOKS_MAKE_TYPE
149 #define LANG_HOOKS_MAKE_TYPE cxx_make_type
150 #undef LANG_HOOKS_TYPE_FOR_MODE
151 #define LANG_HOOKS_TYPE_FOR_MODE c_common_type_for_mode
152 #undef LANG_HOOKS_TYPE_FOR_SIZE
153 #define LANG_HOOKS_TYPE_FOR_SIZE c_common_type_for_size
154 #undef LANG_HOOKS_SIGNED_TYPE
155 #define LANG_HOOKS_SIGNED_TYPE c_common_signed_type
156 #undef LANG_HOOKS_UNSIGNED_TYPE
157 #define LANG_HOOKS_UNSIGNED_TYPE c_common_unsigned_type
158 #undef LANG_HOOKS_SIGNED_OR_UNSIGNED_TYPE
159 #define LANG_HOOKS_SIGNED_OR_UNSIGNED_TYPE c_common_signed_or_unsigned_type
160 #undef LANG_HOOKS_INCOMPLETE_TYPE_ERROR
161 #define LANG_HOOKS_INCOMPLETE_TYPE_ERROR cxx_incomplete_type_error
162 #undef LANG_HOOKS_TYPE_PROMOTES_TO
163 #define LANG_HOOKS_TYPE_PROMOTES_TO cxx_type_promotes_to
164 #undef LANG_HOOKS_TYPES_COMPATIBLE_P
165 #define LANG_HOOKS_TYPES_COMPATIBLE_P cxx_types_compatible_p
166 #undef LANG_HOOKS_REGISTER_BUILTIN_TYPE
167 #define LANG_HOOKS_REGISTER_BUILTIN_TYPE c_register_builtin_type
168 #undef LANG_HOOKS_GIMPLIFY_EXPR
169 #define LANG_HOOKS_GIMPLIFY_EXPR cp_gimplify_expr
170 #undef LANG_HOOKS_FOLD_OBJ_TYPE_REF
171 #define LANG_HOOKS_FOLD_OBJ_TYPE_REF cp_fold_obj_type_ref
173 /* Each front end provides its own hooks, for toplev.c. */
174 const struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER;
176 /* Tree code classes. */
178 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) TYPE,
180 const char tree_code_type[] = {
183 #include "c-common.def"
185 #include "cp-tree.def"
189 /* Table indexed by tree code giving number of expression
190 operands beyond the fixed part of the node structure.
191 Not used for types or decls. */
193 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) LENGTH,
195 const unsigned char tree_code_length[] = {
198 #include "c-common.def"
200 #include "cp-tree.def"
204 /* Names of tree components.
205 Used for printing out the tree and error messages. */
206 #define DEFTREECODE(SYM, NAME, TYPE, LEN) NAME,
208 const char *const tree_code_name[] = {
211 #include "c-common.def"
213 #include "cp-tree.def"
217 /* Special routine to get the alias set for C++. */
220 cxx_get_alias_set (tree t)
222 if (IS_FAKE_BASE_TYPE (t))
223 /* The base variant of a type must be in the same alias set as the
225 return get_alias_set (TYPE_CONTEXT (t));
227 /* Punt on PMFs until we canonicalize functions properly. */
228 if (TYPE_PTRMEMFUNC_P (t))
231 return c_common_get_alias_set (t);
234 /* Called from check_global_declarations. */
237 cxx_warn_unused_global_decl (tree decl)
239 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl))
241 if (DECL_IN_SYSTEM_HEADER (decl))
244 /* Const variables take the place of #defines in C++. */
245 if (TREE_CODE (decl) == VAR_DECL && TREE_READONLY (decl))
251 /* Langhook for expr_size: Tell the backend that the value of an expression
252 of non-POD class type does not include any tail padding; a derived class
253 might have allocated something there. */
256 cp_expr_size (tree exp)
258 if (CLASS_TYPE_P (TREE_TYPE (exp)))
260 /* The backend should not be interested in the size of an expression
261 of a type with both of these set; all copies of such types must go
262 through a constructor or assignment op. */
263 if (TYPE_HAS_COMPLEX_INIT_REF (TREE_TYPE (exp))
264 && TYPE_HAS_COMPLEX_ASSIGN_REF (TREE_TYPE (exp))
265 /* But storing a CONSTRUCTOR isn't a copy. */
266 && TREE_CODE (exp) != CONSTRUCTOR)
268 /* This would be wrong for a type with virtual bases, but they are
269 caught by the abort above. */
270 return (is_empty_class (TREE_TYPE (exp))
272 : CLASSTYPE_SIZE_UNIT (TREE_TYPE (exp)));
275 /* Use the default code. */
276 return lhd_expr_size (exp);
279 /* Langhook for tree_size: determine size of our 'x' and 'c' nodes. */
281 cp_tree_size (enum tree_code code)
285 case TINST_LEVEL: return sizeof (struct tinst_level_s);
286 case PTRMEM_CST: return sizeof (struct ptrmem_cst);
287 case BASELINK: return sizeof (struct tree_baselink);
288 case TEMPLATE_PARM_INDEX: return sizeof (template_parm_index);
289 case DEFAULT_ARG: return sizeof (struct tree_default_arg);
290 case OVERLOAD: return sizeof (struct tree_overload);
297 /* Returns true if T is a variably modified type, in the sense of C99.
298 FN is as passed to variably_modified_p.
299 This routine needs only check cases that cannot be handled by the
300 language-independent logic in tree.c. */
303 cp_var_mod_type_p (tree type, tree fn)
305 /* If TYPE is a pointer-to-member, it is variably modified if either
306 the class or the member are variably modified. */
307 if (TYPE_PTR_TO_MEMBER_P (type))
308 return (variably_modified_type_p (TYPE_PTRMEM_CLASS_TYPE (type), fn)
309 || variably_modified_type_p (TYPE_PTRMEM_POINTED_TO_TYPE (type),
312 /* All other types are not variably modified. */
316 /* This compares two types for equivalence ("compatible" in C-based languages).
317 This routine should only return 1 if it is sure. It should not be used
318 in contexts where erroneously returning 0 causes problems. */
320 static int cxx_types_compatible_p (tree x, tree y)
322 if (same_type_ignoring_top_level_qualifiers_p (x, y))
325 /* Once we get to the middle-end, references and pointers are
326 interchangeable. FIXME should we try to replace all references with
328 if (POINTER_TYPE_P (x) && POINTER_TYPE_P (y)
329 && same_type_p (TREE_TYPE (x), TREE_TYPE (y)))
335 /* Construct a C++-aware pretty-printer for CONTEXT. It is assumed
336 that CONTEXT->printer is an already constructed basic pretty_printer. */
338 cxx_initialize_diagnostics (diagnostic_context *context)
340 pretty_printer *base = context->printer;
341 cxx_pretty_printer *pp = xmalloc (sizeof (cxx_pretty_printer));
342 memcpy (pp_base (pp), base, sizeof (pretty_printer));
343 pp_cxx_pretty_printer_init (pp);
344 context->printer = (pretty_printer *) pp;
346 /* It is safe to free this object because it was previously malloc()'d. */
350 /* Stubs to keep c-opts.c happy. */
352 push_file_scope (void)
357 pop_file_scope (void)
361 /* c-pragma.c needs to query whether a decl has extern "C" linkage. */
363 has_c_linkage (tree decl)
365 return DECL_EXTERN_C_P (decl);