1 /* Definitions for C parsing and type checking.
2 Copyright (C) 1987, 1993, 1994, 1995, 1997, 1998,
3 1999, 2000, 2001, 2002 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 2, 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 COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
27 /* Language-dependent contents of an identifier. */
29 /* The limbo_value is used for block level extern declarations, which need
30 to be type checked against subsequent extern declarations. They can't
31 be referenced after they fall out of scope, so they can't be global.
33 The rid_code field is used for keywords. It is in all
34 lang_identifier nodes, because some keywords are only special in a
35 particular context. */
37 struct lang_identifier
GTY(())
39 struct c_common_identifier common_id
;
48 /* The resulting tree type. */
51 GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE")))
53 union tree_node
GTY ((tag ("0"),
54 desc ("tree_node_structure (&%h)")))
56 struct lang_identifier
GTY ((tag ("1"))) identifier
;
59 /* Language-specific declaration information. */
61 struct lang_decl
GTY(())
63 struct c_lang_decl base
;
64 /* The return types and parameter types may have variable size.
65 This is a list of any SAVE_EXPRs that need to be evaluated to
66 compute those sizes. */
70 /* Macros for access to language-specific slots in an identifier. */
71 /* Each of these slots contains a DECL node or null. */
73 /* This represents the value which the identifier has in the
74 file-scope namespace. */
75 #define IDENTIFIER_GLOBAL_VALUE(NODE) \
76 (((struct lang_identifier *) (NODE))->global_value)
77 /* This represents the value which the identifier has in the current
79 #define IDENTIFIER_LOCAL_VALUE(NODE) \
80 (((struct lang_identifier *) (NODE))->local_value)
81 /* This represents the value which the identifier has as a label in
82 the current label scope. */
83 #define IDENTIFIER_LABEL_VALUE(NODE) \
84 (((struct lang_identifier *) (NODE))->label_value)
85 /* This records the extern decl of this identifier, if it has had one
86 at any point in this compilation. */
87 #define IDENTIFIER_LIMBO_VALUE(NODE) \
88 (((struct lang_identifier *) (NODE))->limbo_value)
89 /* This records the implicit function decl of this identifier, if it
90 has had one at any point in this compilation. */
91 #define IDENTIFIER_IMPLICIT_DECL(NODE) \
92 (((struct lang_identifier *) (NODE))->implicit_decl)
93 /* This is the last function in which we printed an "undefined variable"
94 message for this identifier. Value is a FUNCTION_DECL or null. */
95 #define IDENTIFIER_ERROR_LOCUS(NODE) \
96 (((struct lang_identifier *) (NODE))->error_locus)
98 /* In identifiers, C uses the following fields in a special way:
99 TREE_PUBLIC to record that there was a previous local extern decl.
100 TREE_USED to record that such a decl was used.
101 TREE_ADDRESSABLE to record that the address of such a decl was used. */
103 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only. */
104 #define C_TYPE_FIELDS_READONLY(TYPE) TREE_LANG_FLAG_1 (TYPE)
106 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile. */
107 #define C_TYPE_FIELDS_VOLATILE(TYPE) TREE_LANG_FLAG_2 (TYPE)
109 /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
110 nonzero if the definition of the type has already started. */
111 #define C_TYPE_BEING_DEFINED(TYPE) TYPE_LANG_FLAG_0 (TYPE)
113 /* In an IDENTIFIER_NODE, nonzero if this identifier is actually a
114 keyword. C_RID_CODE (node) is then the RID_* value of the keyword,
115 and C_RID_YYCODE is the token number wanted by Yacc. */
116 #define C_IS_RESERVED_WORD(ID) TREE_LANG_FLAG_0 (ID)
118 /* This function was declared inline. This flag controls the linkage
119 semantics of 'inline'; whether or not the function is inlined is
120 controlled by DECL_INLINE. */
121 #define DECL_DECLARED_INLINE_P(NODE) \
122 (DECL_LANG_SPECIFIC (NODE)->base.declared_inline)
124 /* In a RECORD_TYPE, a sorted array of the fields of the type. */
125 struct lang_type
GTY(())
128 tree
GTY((length ("%h.len"))) elts
[1];
131 /* Record whether a type or decl was written with nonconstant size.
132 Note that TYPE_SIZE may have simplified to a constant. */
133 #define C_TYPE_VARIABLE_SIZE(TYPE) TYPE_LANG_FLAG_1 (TYPE)
134 #define C_DECL_VARIABLE_SIZE(TYPE) DECL_LANG_FLAG_0 (TYPE)
136 #if 0 /* Not used. */
137 /* Record whether a decl for a function or function pointer has
138 already been mentioned (in a warning) because it was called
139 but didn't have a prototype. */
140 #define C_MISSING_PROTOTYPE_WARNED(DECL) DECL_LANG_FLAG_2 (DECL)
143 /* Store a value in that field. */
144 #define C_SET_EXP_ORIGINAL_CODE(EXP, CODE) \
145 (TREE_COMPLEXITY (EXP) = (int) (CODE))
147 /* Record whether a typedef for type `int' was actually `signed int'. */
148 #define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP)
150 /* For a FUNCTION_DECL, nonzero if it was defined without an explicit
152 #define C_FUNCTION_IMPLICIT_INT(EXP) DECL_LANG_FLAG_1 (EXP)
154 /* Nonzero for a declaration of a built in function if there has been no
155 occasion that would declare the function in ordinary C.
156 Using the function draws a pedantic warning in this case. */
157 #define C_DECL_ANTICIPATED(EXP) DECL_LANG_FLAG_3 (EXP)
159 /* For FUNCTION_TYPE, a hidden list of types of arguments. The same as
160 TYPE_ARG_TYPES for functions with prototypes, but created for functions
161 without prototypes. */
162 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_BINFO (NODE)
165 /* in c-lang.c and objc-act.c */
166 extern tree lookup_interface
PARAMS ((tree
));
167 extern tree is_class_name
PARAMS ((tree
));
168 extern tree objc_is_id
PARAMS ((tree
));
169 extern void objc_check_decl
PARAMS ((tree
));
170 extern void finish_file
PARAMS ((void));
171 extern int objc_comptypes
PARAMS ((tree
, tree
, int));
172 extern tree objc_message_selector
PARAMS ((void));
173 extern tree lookup_objc_ivar
PARAMS ((tree
));
177 extern void c_parse_init
PARAMS ((void));
179 /* in c-aux-info.c */
180 extern void gen_aux_info_record
PARAMS ((tree
, int, int, int));
183 extern int global_bindings_p
PARAMS ((void));
184 extern int kept_level_p
PARAMS ((void));
185 extern tree getdecls
PARAMS ((void));
186 extern void pushlevel
PARAMS ((int));
187 extern tree poplevel
PARAMS ((int,int, int));
188 extern void insert_block
PARAMS ((tree
));
189 extern void set_block
PARAMS ((tree
));
190 extern tree pushdecl
PARAMS ((tree
));
192 extern void c_insert_default_attributes
PARAMS ((tree
));
193 extern void c_init_decl_processing
PARAMS ((void));
194 extern void c_dup_lang_specific_decl
PARAMS ((tree
));
195 extern void c_print_identifier
PARAMS ((FILE *, tree
, int));
196 extern tree build_array_declarator
PARAMS ((tree
, tree
, int, int));
197 extern tree build_enumerator
PARAMS ((tree
, tree
));
198 extern void check_for_loop_decls
PARAMS ((void));
199 extern void clear_parm_order
PARAMS ((void));
200 extern int complete_array_type
PARAMS ((tree
, tree
, int));
201 extern void declare_parm_level
PARAMS ((int));
202 extern tree define_label
PARAMS ((const char *, int,
204 extern void finish_decl
PARAMS ((tree
, tree
, tree
));
205 extern tree finish_enum
PARAMS ((tree
, tree
, tree
));
206 extern void finish_function
PARAMS ((int, int));
207 extern tree finish_struct
PARAMS ((tree
, tree
, tree
));
208 extern tree get_parm_info
PARAMS ((int));
209 extern tree grokfield
PARAMS ((const char *, int, tree
, tree
, tree
));
210 extern tree groktypename
PARAMS ((tree
));
211 extern tree groktypename_in_parm_context
PARAMS ((tree
));
212 extern tree implicitly_declare
PARAMS ((tree
));
213 extern void implicit_decl_warning
PARAMS ((tree
));
214 extern int in_parm_level_p
PARAMS ((void));
215 extern void keep_next_level
PARAMS ((void));
216 extern tree lookup_name
PARAMS ((tree
));
217 extern tree lookup_name_current_level
PARAMS ((tree
));
218 extern void parmlist_tags_warning
PARAMS ((void));
219 extern void pending_xref_error
PARAMS ((void));
220 extern void c_push_function_context
PARAMS ((struct function
*));
221 extern void c_pop_function_context
PARAMS ((struct function
*));
222 extern void pop_label_level
PARAMS ((void));
223 extern void push_label_level
PARAMS ((void));
224 extern void push_parm_decl
PARAMS ((tree
));
225 extern tree pushdecl_top_level
PARAMS ((tree
));
226 extern void pushtag
PARAMS ((tree
, tree
));
227 extern tree set_array_declarator_type
PARAMS ((tree
, tree
, int));
228 extern tree shadow_label
PARAMS ((tree
));
229 extern void shadow_tag
PARAMS ((tree
));
230 extern void shadow_tag_warned
PARAMS ((tree
, int));
231 extern tree start_enum
PARAMS ((tree
));
232 extern int start_function
PARAMS ((tree
, tree
, tree
));
233 extern tree start_decl
PARAMS ((tree
, tree
, int,
235 extern tree start_struct
PARAMS ((enum tree_code
, tree
));
236 extern void store_parm_decls
PARAMS ((void));
237 extern tree xref_tag
PARAMS ((enum tree_code
, tree
));
238 extern tree c_begin_compound_stmt
PARAMS ((void));
239 extern void c_expand_deferred_function
PARAMS ((tree
));
240 extern void c_expand_decl_stmt
PARAMS ((tree
));
241 extern tree make_pointer_declarator
PARAMS ((tree
, tree
));
243 /* in c-objc-common.c */
244 extern int c_disregard_inline_limits
PARAMS ((tree
));
245 extern int c_cannot_inline_tree_fn
PARAMS ((tree
*));
246 extern const char *c_objc_common_init
PARAMS ((const char *));
247 extern int c_missing_noreturn_ok_p
PARAMS ((tree
));
248 extern void c_objc_common_finish_file
PARAMS ((void));
249 extern int defer_fn
PARAMS ((tree
));
250 extern bool c_warn_unused_global_decl
PARAMS ((tree
));
252 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P) \
253 c_build_qualified_type ((TYPE), \
254 ((CONST_P) ? TYPE_QUAL_CONST : 0) | \
255 ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
257 #define c_sizeof_nowarn(T) c_sizeof_or_alignof_type (T, SIZEOF_EXPR, 0)
259 extern tree require_complete_type
PARAMS ((tree
));
260 extern int comptypes
PARAMS ((tree
, tree
));
261 extern tree c_size_in_bytes
PARAMS ((tree
));
262 extern bool c_mark_addressable
PARAMS ((tree
));
263 extern void c_incomplete_type_error
PARAMS ((tree
, tree
));
264 extern tree c_type_promotes_to
PARAMS ((tree
));
265 extern tree build_component_ref
PARAMS ((tree
, tree
));
266 extern tree build_indirect_ref
PARAMS ((tree
, const char *));
267 extern tree build_array_ref
PARAMS ((tree
, tree
));
268 extern tree build_external_ref
PARAMS ((tree
, int));
269 extern tree parser_build_binary_op
PARAMS ((enum tree_code
,
271 extern void readonly_warning
PARAMS ((tree
, const char *));
272 extern tree build_conditional_expr
PARAMS ((tree
, tree
, tree
));
273 extern tree build_compound_expr
PARAMS ((tree
));
274 extern tree c_cast_expr
PARAMS ((tree
, tree
));
275 extern tree build_c_cast
PARAMS ((tree
, tree
));
276 extern tree build_modify_expr
PARAMS ((tree
, enum tree_code
,
278 extern void store_init_value
PARAMS ((tree
, tree
));
279 extern void error_init
PARAMS ((const char *));
280 extern void pedwarn_init
PARAMS ((const char *));
281 extern void start_init
PARAMS ((tree
, tree
, int));
282 extern void finish_init
PARAMS ((void));
283 extern void really_start_incremental_init
PARAMS ((tree
));
284 extern void push_init_level
PARAMS ((int));
285 extern tree pop_init_level
PARAMS ((int));
286 extern void set_init_index
PARAMS ((tree
, tree
));
287 extern void set_init_label
PARAMS ((tree
));
288 extern void process_init_element
PARAMS ((tree
));
289 extern tree build_compound_literal
PARAMS ((tree
, tree
));
290 extern void pedwarn_c99
PARAMS ((const char *, ...))
292 extern tree c_start_case
PARAMS ((tree
));
293 extern void c_finish_case
PARAMS ((void));
294 extern tree simple_asm_stmt
PARAMS ((tree
));
295 extern tree build_asm_stmt
PARAMS ((tree
, tree
, tree
,
297 extern tree c_convert_parm_for_inlining
PARAMS ((tree
, tree
, tree
));
299 /* Set to 0 at beginning of a function definition, set to 1 if
300 a return statement that specifies a return value is seen. */
302 extern int current_function_returns_value
;
304 /* Set to 0 at beginning of a function definition, set to 1 if
305 a return statement with no argument is seen. */
307 extern int current_function_returns_null
;
309 /* Set to 0 at beginning of a function definition, set to 1 if
310 a call to a noreturn function is seen. */
312 extern int current_function_returns_abnormally
;
314 /* Nonzero means we are reading code that came from a system header file. */
316 extern int system_header_p
;
319 extern void c_finish_incomplete_decl
PARAMS ((tree
));
321 extern GTY(()) tree static_ctors
;
322 extern GTY(()) tree static_dtors
;
324 #endif /* ! GCC_C_TREE_H */