1 /* Definitions for C parsing and type checking.
2 Copyright (C) 1987, 1993, 1994, 1995, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004 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 ("TREE_CODE (&%h.generic) == INTEGER_TYPE ? (union lang_tree_node *)TYPE_NEXT_VARIANT (&%h.generic) : (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 /* The return types and parameter types may have variable size.
62 This is a list of any SAVE_EXPRs that need to be evaluated to
63 compute those sizes. */
67 /* Macros for access to language-specific slots in an identifier. */
68 /* Each of these slots contains a DECL node or null. */
70 /* The value of the identifier in the namespace of "ordinary identifiers"
71 (data objects, enum constants, functions, typedefs). */
72 #define IDENTIFIER_SYMBOL_VALUE(NODE) \
73 (((struct lang_identifier *) (NODE))->symbol_value)
74 /* The value of the identifier in the namespace of struct, union,
76 #define IDENTIFIER_TAG_VALUE(NODE) \
77 (((struct lang_identifier *) (NODE))->tag_value)
78 /* The value of the identifier in the namespace of labels. */
79 #define IDENTIFIER_LABEL_VALUE(NODE) \
80 (((struct lang_identifier *) (NODE))->label_value)
82 /* In identifiers, C uses the following fields in a special way:
83 TREE_PUBLIC to record that there was a previous local extern decl.
84 TREE_USED to record that such a decl was used.
85 TREE_ADDRESSABLE to record that the address of such a decl was used. */
87 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only. */
88 #define C_TYPE_FIELDS_READONLY(TYPE) TREE_LANG_FLAG_1 (TYPE)
90 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile. */
91 #define C_TYPE_FIELDS_VOLATILE(TYPE) TREE_LANG_FLAG_2 (TYPE)
93 /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
94 nonzero if the definition of the type has already started. */
95 #define C_TYPE_BEING_DEFINED(TYPE) TYPE_LANG_FLAG_0 (TYPE)
97 /* In an incomplete RECORD_TYPE or UNION_TYPE, a list of variable
98 declarations whose type would be completed by completing that type. */
99 #define C_TYPE_INCOMPLETE_VARS(TYPE) TYPE_VFIELD (TYPE)
101 /* In an IDENTIFIER_NODE, nonzero if this identifier is actually a
102 keyword. C_RID_CODE (node) is then the RID_* value of the keyword,
103 and C_RID_YYCODE is the token number wanted by Yacc. */
104 #define C_IS_RESERVED_WORD(ID) TREE_LANG_FLAG_0 (ID)
106 /* In a RECORD_TYPE, a sorted array of the fields of the type. */
107 struct lang_type
GTY(())
109 struct sorted_fields_type
* GTY ((reorder ("resort_sorted_fields"))) s
;
112 /* Record whether a type or decl was written with nonconstant size.
113 Note that TYPE_SIZE may have simplified to a constant. */
114 #define C_TYPE_VARIABLE_SIZE(TYPE) TYPE_LANG_FLAG_1 (TYPE)
115 #define C_DECL_VARIABLE_SIZE(TYPE) DECL_LANG_FLAG_0 (TYPE)
117 /* Store a value in that field. */
118 #define C_SET_EXP_ORIGINAL_CODE(EXP, CODE) \
119 (TREE_COMPLEXITY (EXP) = (int) (CODE))
121 /* Record whether a typedef for type `int' was actually `signed int'. */
122 #define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP)
124 /* For a FUNCTION_DECL, nonzero if it was defined without an explicit
126 #define C_FUNCTION_IMPLICIT_INT(EXP) DECL_LANG_FLAG_1 (EXP)
128 /* For a FUNCTION_DECL, nonzero if it was an implicit declaration. */
129 #define C_DECL_IMPLICIT(EXP) DECL_LANG_FLAG_2 (EXP)
131 /* Nonzero for a declaration of an external object which is not
132 currently in scope. This is either a built-in declaration of
133 a library function, before a real declaration has been seen,
134 or a declaration that appeared in an inner scope that has ended. */
135 #define C_DECL_INVISIBLE(EXP) DECL_LANG_FLAG_3 (EXP)
137 /* Nonzero for a decl which either doesn't exist or isn't a prototype.
138 N.B. Could be simplified if all built-in decls had complete prototypes
139 (but this is presently difficult because some of them need FILE*). */
140 #define C_DECL_ISNT_PROTOTYPE(EXP) \
142 || (TYPE_ARG_TYPES (TREE_TYPE (EXP)) == 0 \
143 && !DECL_BUILT_IN (EXP)))
145 /* For FUNCTION_TYPE, a hidden list of types of arguments. The same as
146 TYPE_ARG_TYPES for functions with prototypes, but created for functions
147 without prototypes. */
148 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_BINFO (NODE)
150 /* Values for the first parameter to poplevel. */
155 /* Save and restore the variables in this file and elsewhere
156 that keep track of the progress of compilation of the current function.
157 Used for nested functions. */
159 struct language_function
GTY(())
161 struct c_language_function base
;
164 int returns_abnormally
;
165 int warn_about_return_type
;
167 int x_in_iteration_stmt
;
173 extern void c_parse_init (void);
175 /* in c-aux-info.c */
176 extern void gen_aux_info_record (tree
, int, int, int);
179 extern int c_in_iteration_stmt
;
180 extern int c_in_case_stmt
;
182 extern int global_bindings_p (void);
183 extern tree
getdecls (void);
184 extern void pushlevel (int);
185 extern void insert_block (tree
);
186 extern void set_block (tree
);
187 extern tree
pushdecl (tree
);
188 extern void c_expand_body (tree
);
190 extern void c_init_decl_processing (void);
191 extern void c_dup_lang_specific_decl (tree
);
192 extern void c_print_identifier (FILE *, tree
, int);
193 extern tree
build_array_declarator (tree
, tree
, int, int);
194 extern tree
build_enumerator (tree
, tree
);
195 extern void check_for_loop_decls (void);
196 extern void mark_forward_parm_decls (void);
197 extern int complete_array_type (tree
, tree
, int);
198 extern void declare_parm_level (void);
199 extern void undeclared_variable (tree
);
200 extern tree
declare_label (tree
);
201 extern tree
define_label (location_t
, tree
);
202 extern void finish_decl (tree
, tree
, tree
);
203 extern tree
finish_enum (tree
, tree
, tree
);
204 extern void finish_function (void);
205 extern tree
finish_struct (tree
, tree
, tree
);
206 extern tree
get_parm_info (int);
207 extern tree
grokfield (tree
, tree
, tree
);
208 extern tree
groktypename (tree
);
209 extern tree
groktypename_in_parm_context (tree
);
210 extern tree
implicitly_declare (tree
);
211 extern int in_parm_level_p (void);
212 extern void keep_next_level (void);
213 extern tree
lookup_name (tree
);
214 extern void pending_xref_error (void);
215 extern void c_push_function_context (struct function
*);
216 extern void c_pop_function_context (struct function
*);
217 extern void push_parm_decl (tree
);
218 extern tree
pushdecl_top_level (tree
);
219 extern void pushtag (tree
, tree
);
220 extern tree
set_array_declarator_type (tree
, tree
, int);
221 extern void shadow_tag (tree
);
222 extern void shadow_tag_warned (tree
, int);
223 extern tree
start_enum (tree
);
224 extern int start_function (tree
, tree
, tree
);
225 extern tree
start_decl (tree
, tree
, int, tree
);
226 extern tree
start_struct (enum tree_code
, tree
);
227 extern void store_parm_decls (void);
228 extern tree
xref_tag (enum tree_code
, tree
);
229 extern tree
c_begin_compound_stmt (void);
230 extern void c_expand_decl_stmt (tree
);
231 extern void c_static_assembler_name (tree
);
232 extern tree
make_pointer_declarator (tree
, tree
);
233 extern void merge_translation_unit_decls (void);
235 /* in c-objc-common.c */
236 extern int c_disregard_inline_limits (tree
);
237 extern int c_cannot_inline_tree_fn (tree
*);
238 extern bool c_objc_common_init (void);
239 extern tree
c_objc_common_truthvalue_conversion (tree expr
);
240 extern int c_missing_noreturn_ok_p (tree
);
241 extern void c_objc_common_finish_file (void);
242 extern int defer_fn (tree
);
243 extern bool c_warn_unused_global_decl (tree
);
245 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P) \
246 c_build_qualified_type ((TYPE), \
247 ((CONST_P) ? TYPE_QUAL_CONST : 0) | \
248 ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
250 #define c_sizeof_nowarn(T) c_sizeof_or_alignof_type (T, SIZEOF_EXPR, 0)
254 /* For use with comptypes. */
259 extern tree
require_complete_type (tree
);
260 extern int comptypes (tree
, tree
, int);
261 extern tree
c_size_in_bytes (tree
);
262 extern bool c_mark_addressable (tree
);
263 extern void c_incomplete_type_error (tree
, tree
);
264 extern tree
c_type_promotes_to (tree
);
265 extern tree
build_component_ref (tree
, tree
);
266 extern tree
build_indirect_ref (tree
, const char *);
267 extern tree
build_array_ref (tree
, tree
);
268 extern tree
build_external_ref (tree
, int);
269 extern tree
parser_build_binary_op (enum tree_code
, tree
, tree
);
270 extern int c_tree_expr_nonnegative_p (tree
);
271 extern void readonly_error (tree
, const char *);
272 extern tree
build_conditional_expr (tree
, tree
, tree
);
273 extern tree
build_compound_expr (tree
);
274 extern tree
c_cast_expr (tree
, tree
);
275 extern tree
build_c_cast (tree
, tree
);
276 extern tree
build_modify_expr (tree
, enum tree_code
, tree
);
277 extern void store_init_value (tree
, tree
);
278 extern void error_init (const char *);
279 extern void pedwarn_init (const char *);
280 extern void start_init (tree
, tree
, int);
281 extern void finish_init (void);
282 extern void really_start_incremental_init (tree
);
283 extern void push_init_level (int);
284 extern tree
pop_init_level (int);
285 extern void set_init_index (tree
, tree
);
286 extern void set_init_label (tree
);
287 extern void process_init_element (tree
);
288 extern tree
build_compound_literal (tree
, tree
);
289 extern void pedwarn_c90 (const char *, ...) ATTRIBUTE_PRINTF_1
;
290 extern void pedwarn_c99 (const char *, ...) ATTRIBUTE_PRINTF_1
;
291 extern tree
c_start_case (tree
);
292 extern void c_finish_case (void);
293 extern tree
build_asm_expr (tree
, tree
, tree
, tree
, bool);
294 extern tree
build_asm_stmt (tree
, tree
);
295 extern tree
c_convert_parm_for_inlining (tree
, tree
, tree
, int);
297 /* Set to 0 at beginning of a function definition, set to 1 if
298 a return statement that specifies a return value is seen. */
300 extern int current_function_returns_value
;
302 /* Set to 0 at beginning of a function definition, set to 1 if
303 a return statement with no argument is seen. */
305 extern int current_function_returns_null
;
307 /* Set to 0 at beginning of a function definition, set to 1 if
308 a call to a noreturn function is seen. */
310 extern int current_function_returns_abnormally
;
312 /* Nonzero means we are reading code that came from a system header file. */
314 extern int system_header_p
;
317 extern void c_finish_incomplete_decl (tree
);
318 extern void *get_current_scope (void);
319 extern void objc_mark_locals_volatile (void *);
320 extern void c_write_global_declarations (void);
322 extern GTY(()) tree static_ctors
;
323 extern GTY(()) tree static_dtors
;
325 /* In order for the format checking to accept the C frontend
326 diagnostic framework extensions, you must include this file before
327 toplev.h, not after. */
328 #define GCC_DIAG_STYLE __gcc_cdiag__
330 #endif /* ! GCC_C_TREE_H */