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
26 #include "diagnostic.h"
28 /* struct lang_identifier is private to c-decl.c, but langhooks.c needs to
29 know how big it is. This is sanity-checked in c-decl.c. */
30 #define C_SIZEOF_STRUCT_LANG_IDENTIFIER \
31 (sizeof (struct c_common_identifier) + 3 * sizeof (void *))
33 /* For gc purposes, return the most likely link for the longest chain. */
34 #define C_LANG_TREE_NODE_CHAIN_NEXT(T) \
35 ((union lang_tree_node *) \
36 (TREE_CODE (T) == INTEGER_TYPE ? TYPE_NEXT_VARIANT (T) \
37 : TREE_CODE (T) == COMPOUND_EXPR ? TREE_OPERAND (T, 1) \
40 /* Language-specific declaration information. */
42 struct lang_decl GTY(())
44 /* The return types and parameter types may have variable size.
45 This is a list of any SAVE_EXPRs that need to be evaluated to
46 compute those sizes. */
50 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only. */
51 #define C_TYPE_FIELDS_READONLY(TYPE) TREE_LANG_FLAG_1 (TYPE)
53 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile. */
54 #define C_TYPE_FIELDS_VOLATILE(TYPE) TREE_LANG_FLAG_2 (TYPE)
56 /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
57 nonzero if the definition of the type has already started. */
58 #define C_TYPE_BEING_DEFINED(TYPE) TYPE_LANG_FLAG_0 (TYPE)
60 /* In an incomplete RECORD_TYPE or UNION_TYPE, a list of variable
61 declarations whose type would be completed by completing that type. */
62 #define C_TYPE_INCOMPLETE_VARS(TYPE) TYPE_VFIELD (TYPE)
64 /* In an IDENTIFIER_NODE, nonzero if this identifier is actually a
65 keyword. C_RID_CODE (node) is then the RID_* value of the keyword,
66 and C_RID_YYCODE is the token number wanted by Yacc. */
67 #define C_IS_RESERVED_WORD(ID) TREE_LANG_FLAG_0 (ID)
69 struct lang_type GTY(())
71 /* In a RECORD_TYPE, a sorted array of the fields of the type. */
72 struct sorted_fields_type * GTY ((reorder ("resort_sorted_fields"))) s;
73 /* In an ENUMERAL_TYPE, the min and max values. */
78 /* Record whether a type or decl was written with nonconstant size.
79 Note that TYPE_SIZE may have simplified to a constant. */
80 #define C_TYPE_VARIABLE_SIZE(TYPE) TYPE_LANG_FLAG_1 (TYPE)
81 #define C_DECL_VARIABLE_SIZE(TYPE) DECL_LANG_FLAG_0 (TYPE)
83 /* Record whether a typedef for type `int' was actually `signed int'. */
84 #define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP)
86 /* For a FUNCTION_DECL, nonzero if it was defined without an explicit
88 #define C_FUNCTION_IMPLICIT_INT(EXP) DECL_LANG_FLAG_1 (EXP)
90 /* For a FUNCTION_DECL, nonzero if it was an implicit declaration. */
91 #define C_DECL_IMPLICIT(EXP) DECL_LANG_FLAG_2 (EXP)
93 /* For FUNCTION_DECLs, evaluates true if the decl is built-in but has
95 #define C_DECL_DECLARED_BUILTIN(EXP) DECL_LANG_FLAG_3 (EXP)
97 /* Record whether a decl was declared register. This is strictly a
98 front-end flag, whereas DECL_REGISTER is used for code generation;
99 they may differ for structures with volatile fields. */
100 #define C_DECL_REGISTER(EXP) DECL_LANG_FLAG_4 (EXP)
102 /* Record whether a decl was used in an expression anywhere except an
103 unevaluated operand of sizeof / typeof / alignof. This is only
104 used for functions declared static but not defined, though outside
105 sizeof and typeof it is set for other function decls as well. */
106 #define C_DECL_USED(EXP) DECL_LANG_FLAG_5 (EXP)
108 /* Nonzero for a decl which either doesn't exist or isn't a prototype.
109 N.B. Could be simplified if all built-in decls had complete prototypes
110 (but this is presently difficult because some of them need FILE*). */
111 #define C_DECL_ISNT_PROTOTYPE(EXP) \
113 || (TYPE_ARG_TYPES (TREE_TYPE (EXP)) == 0 \
114 && !DECL_BUILT_IN (EXP)))
116 /* For FUNCTION_TYPE, a hidden list of types of arguments. The same as
117 TYPE_ARG_TYPES for functions with prototypes, but created for functions
118 without prototypes. */
119 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_LANG_SLOT_1 (NODE)
121 /* Record parser information about an expression that is irrelevant
122 for code generation alongside a tree representing its value. */
125 /* The value of the expression. */
127 /* Record the original binary operator of an expression, which may
128 have been changed by fold, STRING_CST for unparenthesised string
129 constants, or ERROR_MARK for other expressions (including
130 parenthesized expressions). */
131 enum tree_code original_code;
134 /* The various kinds of declarators in C. */
135 enum c_declarator_kind {
144 /* Parenthesized declarator with nested attributes. */
148 /* Information about the parameters in a function declarator. */
150 /* A list of parameter decls. */
152 /* A list of structure, union and enum tags defined. */
154 /* A list of argument types to go in the FUNCTION_TYPE. */
156 /* A list of non-parameter decls (notably enumeration constants)
157 defined with the parameters. */
162 struct c_declarator {
163 /* The kind of declarator. */
164 enum c_declarator_kind kind;
165 /* Except for cdk_id, the contained declarator. For cdk_id, NULL. */
166 struct c_declarator *declarator;
168 /* For identifiers, an IDENTIFIER_NODE or NULL_TREE if an abstract
172 struct c_arg_info *arg_info;
175 /* The array dimension, or NULL for [] and [*]. */
177 /* The qualifiers (and attributes, currently ignored) inside []. */
179 /* Whether [static] was used. */
180 BOOL_BITFIELD static_p : 1;
181 /* Whether [*] was used. */
182 BOOL_BITFIELD vla_unspec_p : 1;
184 /* For pointers, the qualifiers on the pointer type. */
186 /* For attributes. */
193 /* The declaration specifiers. */
195 /* The declarator. */
196 struct c_declarator *declarator;
201 /* The declaration specifiers, minus any prefix attributes. */
203 /* The attributes. */
205 /* The declarator. */
206 struct c_declarator *declarator;
209 /* Save and restore the variables in this file and elsewhere
210 that keep track of the progress of compilation of the current function.
211 Used for nested functions. */
213 struct language_function GTY(())
215 struct c_language_function base;
218 struct c_switch * GTY((skip)) x_switch_stack;
219 struct c_arg_info * GTY((skip)) arg_info;
222 int returns_abnormally;
223 int warn_about_return_type;
229 extern void c_parse_init (void);
231 /* in c-aux-info.c */
232 extern void gen_aux_info_record (tree, int, int, int);
235 extern struct obstack parser_obstack;
236 extern tree c_break_label;
237 extern tree c_cont_label;
239 extern int global_bindings_p (void);
240 extern void push_scope (void);
241 extern tree pop_scope (void);
242 extern void insert_block (tree);
243 extern tree pushdecl (tree);
244 extern void c_expand_body (tree);
246 extern void c_init_decl_processing (void);
247 extern void c_dup_lang_specific_decl (tree);
248 extern void c_print_identifier (FILE *, tree, int);
249 extern struct c_declarator *build_array_declarator (tree, tree, bool, bool);
250 extern tree build_enumerator (tree, tree);
251 extern void check_for_loop_decls (void);
252 extern void mark_forward_parm_decls (void);
253 extern int complete_array_type (tree, tree, int);
254 extern void declare_parm_level (void);
255 extern void undeclared_variable (tree);
256 extern tree declare_label (tree);
257 extern tree define_label (location_t, tree);
258 extern void finish_decl (tree, tree, tree);
259 extern tree finish_enum (tree, tree, tree);
260 extern void finish_function (void);
261 extern tree finish_struct (tree, tree, tree);
262 extern struct c_arg_info *get_parm_info (bool);
263 extern tree grokfield (struct c_declarator *, tree, tree);
264 extern void split_specs_attrs (tree, tree *, tree *);
265 extern tree groktypename (struct c_type_name *);
266 extern tree grokparm (const struct c_parm *);
267 extern tree implicitly_declare (tree);
268 extern void keep_next_level (void);
269 extern tree lookup_name (tree);
270 extern void pending_xref_error (void);
271 extern void c_push_function_context (struct function *);
272 extern void c_pop_function_context (struct function *);
273 extern void push_parm_decl (const struct c_parm *);
274 extern tree pushdecl_top_level (tree);
275 extern struct c_declarator *set_array_declarator_inner (struct c_declarator *,
276 struct c_declarator *,
278 extern tree builtin_function (const char *, tree, int, enum built_in_class,
280 extern void shadow_tag (tree);
281 extern void shadow_tag_warned (tree, int);
282 extern tree start_enum (tree);
283 extern int start_function (tree, struct c_declarator *, tree);
284 extern tree start_decl (struct c_declarator *, tree, bool, tree);
285 extern tree start_struct (enum tree_code, tree);
286 extern void store_parm_decls (void);
287 extern void store_parm_decls_from (struct c_arg_info *);
288 extern tree xref_tag (enum tree_code, tree);
289 extern int c_expand_decl (tree);
290 extern struct c_parm *build_c_parm (tree, tree, struct c_declarator *);
291 extern struct c_declarator *build_attrs_declarator (tree,
292 struct c_declarator *);
293 extern struct c_declarator *build_function_declarator (struct c_arg_info *,
294 struct c_declarator *);
295 extern struct c_declarator *build_id_declarator (tree);
296 extern struct c_declarator *make_pointer_declarator (tree,
297 struct c_declarator *);
299 /* in c-objc-common.c */
300 extern int c_disregard_inline_limits (tree);
301 extern int c_cannot_inline_tree_fn (tree *);
302 extern bool c_objc_common_init (void);
303 extern bool c_missing_noreturn_ok_p (tree);
304 extern tree c_objc_common_truthvalue_conversion (tree expr);
305 extern int defer_fn (tree);
306 extern bool c_warn_unused_global_decl (tree);
307 extern void c_initialize_diagnostics (diagnostic_context *);
309 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P) \
310 c_build_qualified_type ((TYPE), \
311 ((CONST_P) ? TYPE_QUAL_CONST : 0) | \
312 ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
315 extern int in_alignof;
316 extern int in_sizeof;
317 extern int in_typeof;
319 extern struct c_switch *c_switch_stack;
321 extern tree require_complete_type (tree);
322 extern int same_translation_unit_p (tree, tree);
323 extern int comptypes (tree, tree);
324 extern tree c_size_in_bytes (tree);
325 extern bool c_mark_addressable (tree);
326 extern void c_incomplete_type_error (tree, tree);
327 extern tree c_type_promotes_to (tree);
328 extern tree composite_type (tree, tree);
329 extern tree build_component_ref (tree, tree);
330 extern tree build_indirect_ref (tree, const char *);
331 extern tree build_array_ref (tree, tree);
332 extern tree build_external_ref (tree, int);
333 extern void record_maybe_used_decl (tree);
334 extern void pop_maybe_used (bool);
335 extern struct c_expr c_expr_sizeof_expr (struct c_expr);
336 extern struct c_expr c_expr_sizeof_type (struct c_type_name *);
337 extern struct c_expr parser_build_binary_op (enum tree_code, struct c_expr,
339 extern void readonly_error (tree, const char *);
340 extern tree build_conditional_expr (tree, tree, tree);
341 extern tree build_compound_expr (tree, tree);
342 extern tree c_cast_expr (struct c_type_name *, tree);
343 extern tree build_c_cast (tree, tree);
344 extern tree build_modify_expr (tree, enum tree_code, tree);
345 extern void store_init_value (tree, tree);
346 extern void error_init (const char *);
347 extern void pedwarn_init (const char *);
348 extern void maybe_warn_string_init (tree, struct c_expr);
349 extern void start_init (tree, tree, int);
350 extern void finish_init (void);
351 extern void really_start_incremental_init (tree);
352 extern void push_init_level (int);
353 extern struct c_expr pop_init_level (int);
354 extern void set_init_index (tree, tree);
355 extern void set_init_label (tree);
356 extern void process_init_element (struct c_expr);
357 extern tree build_compound_literal (tree, tree);
358 extern void pedwarn_c90 (const char *, ...) ATTRIBUTE_PRINTF_1;
359 extern void pedwarn_c99 (const char *, ...) ATTRIBUTE_PRINTF_1;
360 extern tree c_start_case (tree);
361 extern void c_finish_case (tree);
362 extern tree build_asm_expr (tree, tree, tree, tree, bool);
363 extern tree build_asm_stmt (tree, tree);
364 extern tree c_convert_parm_for_inlining (tree, tree, tree, int);
365 extern int c_types_compatible_p (tree, tree);
366 extern tree c_begin_compound_stmt (bool);
367 extern tree c_end_compound_stmt (tree, bool);
368 extern void c_finish_if_stmt (location_t, tree, tree, tree, bool);
369 extern void c_finish_loop (location_t, tree, tree, tree, tree, tree, bool);
370 extern tree c_begin_stmt_expr (void);
371 extern tree c_finish_stmt_expr (tree);
372 extern tree c_process_expr_stmt (tree);
373 extern tree c_finish_expr_stmt (tree);
374 extern tree c_finish_return (tree);
375 extern tree c_finish_bc_stmt (tree *, bool);
376 extern tree c_finish_goto_label (tree);
377 extern tree c_finish_goto_ptr (tree);
379 /* Set to 0 at beginning of a function definition, set to 1 if
380 a return statement that specifies a return value is seen. */
382 extern int current_function_returns_value;
384 /* Set to 0 at beginning of a function definition, set to 1 if
385 a return statement with no argument is seen. */
387 extern int current_function_returns_null;
389 /* Set to 0 at beginning of a function definition, set to 1 if
390 a call to a noreturn function is seen. */
392 extern int current_function_returns_abnormally;
394 /* Nonzero means we are reading code that came from a system header file. */
396 extern int system_header_p;
398 /* True means global_bindings_p should return false even if the scope stack
399 says we are in file scope. */
401 extern bool c_override_global_bindings_to_false;
403 /* True means we've initialized exception handling. */
404 extern bool c_eh_initialized_p;
407 extern void c_finish_incomplete_decl (tree);
408 extern void c_write_global_declarations (void);
410 /* In order for the format checking to accept the C frontend
411 diagnostic framework extensions, you must include this file before
412 toplev.h, not after. */
413 #define GCC_DIAG_STYLE __gcc_cdiag__
415 #endif /* ! GCC_C_TREE_H */