1 /* Definitions for C parsing and type checking.
2 Copyright (C) 1987, 1993, 1994, 1995, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003 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
;
45 /* The resulting tree type. */
48 GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
49 chain_next ("(union lang_tree_node *)TREE_CHAIN (&%h.generic)")))
51 union tree_node
GTY ((tag ("0"),
52 desc ("tree_node_structure (&%h)")))
54 struct lang_identifier
GTY ((tag ("1"))) identifier
;
57 /* Language-specific declaration information. */
59 struct lang_decl
GTY(())
61 struct c_lang_decl base
;
62 /* The return types and parameter types may have variable size.
63 This is a list of any SAVE_EXPRs that need to be evaluated to
64 compute those sizes. */
68 /* Macros for access to language-specific slots in an identifier. */
69 /* Each of these slots contains a DECL node or null. */
71 /* The value of the identifier in the namespace of "ordinary identifiers"
72 (data objects, enum constants, functions, typedefs). */
73 #define IDENTIFIER_SYMBOL_VALUE(NODE) \
74 (((struct lang_identifier *) (NODE))->symbol_value)
75 /* The value of the identifier in the namespace of struct, union,
77 #define IDENTIFIER_TAG_VALUE(NODE) \
78 (((struct lang_identifier *) (NODE))->tag_value)
79 /* The value of the identifier in the namespace of labels. */
80 #define IDENTIFIER_LABEL_VALUE(NODE) \
81 (((struct lang_identifier *) (NODE))->label_value)
83 /* In identifiers, C uses the following fields in a special way:
84 TREE_PUBLIC to record that there was a previous local extern decl.
85 TREE_USED to record that such a decl was used.
86 TREE_ADDRESSABLE to record that the address of such a decl was used. */
88 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only. */
89 #define C_TYPE_FIELDS_READONLY(TYPE) TREE_LANG_FLAG_1 (TYPE)
91 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile. */
92 #define C_TYPE_FIELDS_VOLATILE(TYPE) TREE_LANG_FLAG_2 (TYPE)
94 /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
95 nonzero if the definition of the type has already started. */
96 #define C_TYPE_BEING_DEFINED(TYPE) TYPE_LANG_FLAG_0 (TYPE)
98 /* In an IDENTIFIER_NODE, nonzero if this identifier is actually a
99 keyword. C_RID_CODE (node) is then the RID_* value of the keyword,
100 and C_RID_YYCODE is the token number wanted by Yacc. */
101 #define C_IS_RESERVED_WORD(ID) TREE_LANG_FLAG_0 (ID)
103 /* This function was declared inline. This flag controls the linkage
104 semantics of 'inline'; whether or not the function is inlined is
105 controlled by DECL_INLINE. */
106 #define DECL_DECLARED_INLINE_P(NODE) \
107 (DECL_LANG_SPECIFIC (NODE)->base.declared_inline)
109 /* In a RECORD_TYPE, a sorted array of the fields of the type. */
110 struct lang_type
GTY(())
113 tree
GTY((length ("%h.len"))) elts
[1];
116 /* Record whether a type or decl was written with nonconstant size.
117 Note that TYPE_SIZE may have simplified to a constant. */
118 #define C_TYPE_VARIABLE_SIZE(TYPE) TYPE_LANG_FLAG_1 (TYPE)
119 #define C_DECL_VARIABLE_SIZE(TYPE) DECL_LANG_FLAG_0 (TYPE)
121 /* Store a value in that field. */
122 #define C_SET_EXP_ORIGINAL_CODE(EXP, CODE) \
123 (TREE_COMPLEXITY (EXP) = (int) (CODE))
125 /* Record whether a typedef for type `int' was actually `signed int'. */
126 #define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP)
128 /* For a FUNCTION_DECL, nonzero if it was defined without an explicit
130 #define C_FUNCTION_IMPLICIT_INT(EXP) DECL_LANG_FLAG_1 (EXP)
132 /* For a FUNCTION_DECL, nonzero if it was an implicit declaration. */
133 #define C_DECL_IMPLICIT(EXP) DECL_LANG_FLAG_2 (EXP)
135 /* Nonzero for a declaration of an external object which is not
136 currently in scope. This is either a built-in declaration of
137 a library function, before a real declaration has been seen,
138 or a declaration that appeared in an inner scope that has ended. */
139 #define C_DECL_INVISIBLE(EXP) DECL_LANG_FLAG_3 (EXP)
141 /* Nonzero for a decl which either doesn't exist or isn't a prototype.
142 N.B. Could be simplified if all built-in decls had complete prototypes
143 (but this is presently difficult because some of them need FILE*). */
144 #define C_DECL_ISNT_PROTOTYPE(EXP) \
146 || (TYPE_ARG_TYPES (TREE_TYPE (EXP)) == 0 \
147 && !DECL_BUILT_IN (EXP)))
149 /* For FUNCTION_TYPE, a hidden list of types of arguments. The same as
150 TYPE_ARG_TYPES for functions with prototypes, but created for functions
151 without prototypes. */
152 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_BINFO (NODE)
155 /* in c-lang.c and objc-act.c */
156 extern tree lookup_interface
PARAMS ((tree
));
157 extern tree is_class_name
PARAMS ((tree
));
158 extern tree objc_is_id
PARAMS ((tree
));
159 extern void objc_check_decl
PARAMS ((tree
));
160 extern void finish_file
PARAMS ((void));
161 extern int objc_comptypes
PARAMS ((tree
, tree
, int));
162 extern tree objc_message_selector
PARAMS ((void));
163 extern tree lookup_objc_ivar
PARAMS ((tree
));
164 extern void c_expand_body
PARAMS ((tree
));
168 extern void c_parse_init
PARAMS ((void));
170 /* in c-aux-info.c */
171 extern void gen_aux_info_record
PARAMS ((tree
, int, int, int));
174 extern int global_bindings_p
PARAMS ((void));
175 extern int kept_level_p
PARAMS ((void));
176 extern tree getdecls
PARAMS ((void));
177 extern void pushlevel
PARAMS ((int));
178 extern tree poplevel
PARAMS ((int,int, int));
179 extern void insert_block
PARAMS ((tree
));
180 extern void set_block
PARAMS ((tree
));
181 extern tree pushdecl
PARAMS ((tree
));
183 extern void c_insert_default_attributes
PARAMS ((tree
));
184 extern void c_init_decl_processing
PARAMS ((void));
185 extern void c_dup_lang_specific_decl
PARAMS ((tree
));
186 extern void c_print_identifier
PARAMS ((FILE *, tree
, int));
187 extern tree build_array_declarator
PARAMS ((tree
, tree
, int, int));
188 extern tree build_enumerator
PARAMS ((tree
, tree
));
189 extern void check_for_loop_decls
PARAMS ((void));
190 extern void clear_parm_order
PARAMS ((void));
191 extern int complete_array_type
PARAMS ((tree
, tree
, int));
192 extern void declare_parm_level
PARAMS ((int));
193 extern tree define_label
PARAMS ((const char *, int,
195 extern void finish_decl
PARAMS ((tree
, tree
, tree
));
196 extern tree finish_enum
PARAMS ((tree
, tree
, tree
));
197 extern void finish_function
PARAMS ((int, int));
198 extern tree finish_struct
PARAMS ((tree
, tree
, tree
));
199 extern tree get_parm_info
PARAMS ((int));
200 extern tree grokfield
PARAMS ((const char *, int, tree
, tree
, tree
));
201 extern tree groktypename
PARAMS ((tree
));
202 extern tree groktypename_in_parm_context
PARAMS ((tree
));
203 extern tree implicitly_declare
PARAMS ((tree
));
204 extern int in_parm_level_p
PARAMS ((void));
205 extern void keep_next_level
PARAMS ((void));
206 extern tree lookup_name
PARAMS ((tree
));
207 extern void parmlist_tags_warning
PARAMS ((void));
208 extern void pending_xref_error
PARAMS ((void));
209 extern void c_push_function_context
PARAMS ((struct function
*));
210 extern void c_pop_function_context
PARAMS ((struct function
*));
211 extern void pop_label_level
PARAMS ((void));
212 extern void push_label_level
PARAMS ((void));
213 extern void push_parm_decl
PARAMS ((tree
));
214 extern tree pushdecl_top_level
PARAMS ((tree
));
215 extern tree pushdecl_function_level
PARAMS ((tree
, tree
));
216 extern void pushtag
PARAMS ((tree
, tree
));
217 extern tree set_array_declarator_type
PARAMS ((tree
, tree
, int));
218 extern tree shadow_label
PARAMS ((tree
));
219 extern void shadow_tag
PARAMS ((tree
));
220 extern void shadow_tag_warned
PARAMS ((tree
, int));
221 extern tree start_enum
PARAMS ((tree
));
222 extern int start_function
PARAMS ((tree
, tree
, tree
));
223 extern tree start_decl
PARAMS ((tree
, tree
, int,
225 extern tree start_struct
PARAMS ((enum tree_code
, tree
));
226 extern void store_parm_decls
PARAMS ((void));
227 extern tree xref_tag
PARAMS ((enum tree_code
, tree
));
228 extern tree c_begin_compound_stmt
PARAMS ((void));
229 extern void c_expand_deferred_function
PARAMS ((tree
));
230 extern void c_expand_decl_stmt
PARAMS ((tree
));
231 extern tree make_pointer_declarator
PARAMS ((tree
, tree
));
233 /* in c-objc-common.c */
234 extern int c_disregard_inline_limits
PARAMS ((tree
));
235 extern int c_cannot_inline_tree_fn
PARAMS ((tree
*));
236 extern bool c_objc_common_init
PARAMS ((void));
237 extern int c_missing_noreturn_ok_p
PARAMS ((tree
));
238 extern void c_objc_common_finish_file
PARAMS ((void));
239 extern int defer_fn
PARAMS ((tree
));
240 extern bool c_warn_unused_global_decl
PARAMS ((tree
));
242 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P) \
243 c_build_qualified_type ((TYPE), \
244 ((CONST_P) ? TYPE_QUAL_CONST : 0) | \
245 ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
247 #define c_sizeof_nowarn(T) c_sizeof_or_alignof_type (T, SIZEOF_EXPR, 0)
249 extern tree require_complete_type
PARAMS ((tree
));
250 extern int comptypes
PARAMS ((tree
, tree
));
251 extern tree c_size_in_bytes
PARAMS ((tree
));
252 extern bool c_mark_addressable
PARAMS ((tree
));
253 extern void c_incomplete_type_error
PARAMS ((tree
, tree
));
254 extern tree c_type_promotes_to
PARAMS ((tree
));
255 extern tree build_component_ref
PARAMS ((tree
, tree
));
256 extern tree build_indirect_ref
PARAMS ((tree
, const char *));
257 extern tree build_array_ref
PARAMS ((tree
, tree
));
258 extern tree build_external_ref
PARAMS ((tree
, int));
259 extern tree parser_build_binary_op
PARAMS ((enum tree_code
,
261 extern int c_tree_expr_nonnegative_p
PARAMS ((tree
));
262 extern void readonly_warning
PARAMS ((tree
, const char *));
263 extern tree build_conditional_expr
PARAMS ((tree
, tree
, tree
));
264 extern tree build_compound_expr
PARAMS ((tree
));
265 extern tree c_cast_expr
PARAMS ((tree
, tree
));
266 extern tree build_c_cast
PARAMS ((tree
, tree
));
267 extern tree build_modify_expr
PARAMS ((tree
, enum tree_code
,
269 extern void store_init_value
PARAMS ((tree
, tree
));
270 extern void error_init
PARAMS ((const char *));
271 extern void pedwarn_init
PARAMS ((const char *));
272 extern void start_init
PARAMS ((tree
, tree
, int));
273 extern void finish_init
PARAMS ((void));
274 extern void really_start_incremental_init
PARAMS ((tree
));
275 extern void push_init_level
PARAMS ((int));
276 extern tree pop_init_level
PARAMS ((int));
277 extern void set_init_index
PARAMS ((tree
, tree
));
278 extern void set_init_label
PARAMS ((tree
));
279 extern void process_init_element
PARAMS ((tree
));
280 extern tree build_compound_literal
PARAMS ((tree
, tree
));
281 extern void pedwarn_c99
PARAMS ((const char *, ...))
283 extern tree c_start_case
PARAMS ((tree
));
284 extern void c_finish_case
PARAMS ((void));
285 extern tree simple_asm_stmt
PARAMS ((tree
));
286 extern tree build_asm_stmt
PARAMS ((tree
, tree
, tree
,
288 extern tree c_convert_parm_for_inlining
PARAMS ((tree
, tree
, tree
));
290 /* Set to 0 at beginning of a function definition, set to 1 if
291 a return statement that specifies a return value is seen. */
293 extern int current_function_returns_value
;
295 /* Set to 0 at beginning of a function definition, set to 1 if
296 a return statement with no argument is seen. */
298 extern int current_function_returns_null
;
300 /* Set to 0 at beginning of a function definition, set to 1 if
301 a call to a noreturn function is seen. */
303 extern int current_function_returns_abnormally
;
305 /* Nonzero means we are reading code that came from a system header file. */
307 extern int system_header_p
;
310 extern void c_finish_incomplete_decl
PARAMS ((tree
));
312 extern GTY(()) tree static_ctors
;
313 extern GTY(()) tree static_dtors
;
315 #endif /* ! GCC_C_TREE_H */