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 /* A sequence of declaration specifiers in C. */
136 /* The type specified, not reflecting modifiers such as "short" and
137 "unsigned", or NULL_TREE if none. */
139 /* If the type was specified with a typedef, that typedef decl. */
141 /* The attributes from a typedef decl. */
143 /* When parsing, the attributes. Outside the parser, this will be
144 NULL; attributes (possibly from multiple lists) will be passed
147 /* The modifier bits present. */
149 /* Whether something other than a storage class specifier or
150 attribute has been seen. This is used to warn for the
151 obsolescent usage of storage class specifiers other than at the
152 start of the list. (Doing this properly would require function
153 specifiers to be handled separately from storage class
155 BOOL_BITFIELD non_sc_seen_p : 1;
156 /* Whether the specifiers include a deprecated typedef. */
157 BOOL_BITFIELD deprecated_p : 1;
158 /* Whether "int" was explicitly specified. */
159 BOOL_BITFIELD explicit_int_p : 1;
160 /* Whether "char" was explicitly specified. */
161 BOOL_BITFIELD explicit_char_p : 1;
162 /* Whether "long" was specified more than once. */
163 BOOL_BITFIELD long_long_p : 1;
166 /* The various kinds of declarators in C. */
167 enum c_declarator_kind {
176 /* Parenthesized declarator with nested attributes. */
180 /* Information about the parameters in a function declarator. */
182 /* A list of parameter decls. */
184 /* A list of structure, union and enum tags defined. */
186 /* A list of argument types to go in the FUNCTION_TYPE. */
188 /* A list of non-parameter decls (notably enumeration constants)
189 defined with the parameters. */
194 struct c_declarator {
195 /* The kind of declarator. */
196 enum c_declarator_kind kind;
197 /* Except for cdk_id, the contained declarator. For cdk_id, NULL. */
198 struct c_declarator *declarator;
200 /* For identifiers, an IDENTIFIER_NODE or NULL_TREE if an abstract
204 struct c_arg_info *arg_info;
207 /* The array dimension, or NULL for [] and [*]. */
209 /* The qualifiers (and attributes, currently ignored) inside []. */
210 struct c_declspecs *quals;
211 /* Whether [static] was used. */
212 BOOL_BITFIELD static_p : 1;
213 /* Whether [*] was used. */
214 BOOL_BITFIELD vla_unspec_p : 1;
216 /* For pointers, the qualifiers on the pointer type. */
217 struct c_declspecs *pointer_quals;
218 /* For attributes. */
225 /* The declaration specifiers. */
226 struct c_declspecs *specs;
227 /* The declarator. */
228 struct c_declarator *declarator;
233 /* The declaration specifiers, minus any prefix attributes. */
234 struct c_declspecs *specs;
235 /* The attributes. */
237 /* The declarator. */
238 struct c_declarator *declarator;
241 /* Save and restore the variables in this file and elsewhere
242 that keep track of the progress of compilation of the current function.
243 Used for nested functions. */
245 struct language_function GTY(())
247 struct c_language_function base;
250 struct c_switch * GTY((skip)) x_switch_stack;
251 struct c_arg_info * GTY((skip)) arg_info;
254 int returns_abnormally;
255 int warn_about_return_type;
261 extern void c_parse_init (void);
263 /* in c-aux-info.c */
264 extern void gen_aux_info_record (tree, int, int, int);
267 extern struct obstack parser_obstack;
268 extern tree c_break_label;
269 extern tree c_cont_label;
271 extern int global_bindings_p (void);
272 extern void push_scope (void);
273 extern tree pop_scope (void);
274 extern void insert_block (tree);
275 extern tree pushdecl (tree);
276 extern void c_expand_body (tree);
278 extern void c_init_decl_processing (void);
279 extern void c_dup_lang_specific_decl (tree);
280 extern void c_print_identifier (FILE *, tree, int);
281 extern struct c_declarator *build_array_declarator (tree, struct c_declspecs *,
283 extern tree build_enumerator (tree, tree);
284 extern void check_for_loop_decls (void);
285 extern void mark_forward_parm_decls (void);
286 extern int complete_array_type (tree, tree, int);
287 extern void declare_parm_level (void);
288 extern void undeclared_variable (tree);
289 extern tree declare_label (tree);
290 extern tree define_label (location_t, tree);
291 extern void finish_decl (tree, tree, tree);
292 extern tree finish_enum (tree, tree, tree);
293 extern void finish_function (void);
294 extern tree finish_struct (tree, tree, tree);
295 extern struct c_arg_info *get_parm_info (bool);
296 extern tree grokfield (struct c_declarator *, struct c_declspecs *, tree);
297 extern tree groktypename (struct c_type_name *);
298 extern tree grokparm (const struct c_parm *);
299 extern tree implicitly_declare (tree);
300 extern void keep_next_level (void);
301 extern tree lookup_name (tree);
302 extern void pending_xref_error (void);
303 extern void c_push_function_context (struct function *);
304 extern void c_pop_function_context (struct function *);
305 extern void push_parm_decl (const struct c_parm *);
306 extern tree pushdecl_top_level (tree);
307 extern struct c_declarator *set_array_declarator_inner (struct c_declarator *,
308 struct c_declarator *,
310 extern tree builtin_function (const char *, tree, int, enum built_in_class,
312 extern void shadow_tag (const struct c_declspecs *);
313 extern void shadow_tag_warned (const struct c_declspecs *, int);
314 extern tree start_enum (tree);
315 extern int start_function (struct c_declspecs *, struct c_declarator *, tree);
316 extern tree start_decl (struct c_declarator *, struct c_declspecs *, bool,
318 extern tree start_struct (enum tree_code, tree);
319 extern void store_parm_decls (void);
320 extern void store_parm_decls_from (struct c_arg_info *);
321 extern tree xref_tag (enum tree_code, tree);
322 extern int c_expand_decl (tree);
323 extern struct c_parm *build_c_parm (struct c_declspecs *, tree,
324 struct c_declarator *);
325 extern struct c_declarator *build_attrs_declarator (tree,
326 struct c_declarator *);
327 extern struct c_declarator *build_function_declarator (struct c_arg_info *,
328 struct c_declarator *);
329 extern struct c_declarator *build_id_declarator (tree);
330 extern struct c_declarator *make_pointer_declarator (struct c_declspecs *,
331 struct c_declarator *);
332 extern struct c_declspecs *build_null_declspecs (void);
333 extern struct c_declspecs *declspecs_add_qual (struct c_declspecs *, tree);
334 extern struct c_declspecs *declspecs_add_type (struct c_declspecs *, tree);
335 extern struct c_declspecs *declspecs_add_scspec (struct c_declspecs *, tree);
336 extern struct c_declspecs *declspecs_add_attrs (struct c_declspecs *, tree);
338 /* in c-objc-common.c */
339 extern int c_disregard_inline_limits (tree);
340 extern int c_cannot_inline_tree_fn (tree *);
341 extern bool c_objc_common_init (void);
342 extern bool c_missing_noreturn_ok_p (tree);
343 extern tree c_objc_common_truthvalue_conversion (tree expr);
344 extern int defer_fn (tree);
345 extern bool c_warn_unused_global_decl (tree);
346 extern void c_initialize_diagnostics (diagnostic_context *);
348 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P) \
349 c_build_qualified_type ((TYPE), \
350 ((CONST_P) ? TYPE_QUAL_CONST : 0) | \
351 ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
354 extern int in_alignof;
355 extern int in_sizeof;
356 extern int in_typeof;
358 extern struct c_switch *c_switch_stack;
360 extern tree require_complete_type (tree);
361 extern int same_translation_unit_p (tree, tree);
362 extern int comptypes (tree, tree);
363 extern tree c_size_in_bytes (tree);
364 extern bool c_mark_addressable (tree);
365 extern void c_incomplete_type_error (tree, tree);
366 extern tree c_type_promotes_to (tree);
367 extern tree composite_type (tree, tree);
368 extern tree build_component_ref (tree, tree);
369 extern tree build_indirect_ref (tree, const char *);
370 extern tree build_array_ref (tree, tree);
371 extern tree build_external_ref (tree, int);
372 extern void record_maybe_used_decl (tree);
373 extern void pop_maybe_used (bool);
374 extern struct c_expr c_expr_sizeof_expr (struct c_expr);
375 extern struct c_expr c_expr_sizeof_type (struct c_type_name *);
376 extern struct c_expr parser_build_binary_op (enum tree_code, struct c_expr,
378 extern void readonly_error (tree, const char *);
379 extern tree build_conditional_expr (tree, tree, tree);
380 extern tree build_compound_expr (tree, tree);
381 extern tree c_cast_expr (struct c_type_name *, tree);
382 extern tree build_c_cast (tree, tree);
383 extern tree build_modify_expr (tree, enum tree_code, tree);
384 extern void store_init_value (tree, tree);
385 extern void error_init (const char *);
386 extern void pedwarn_init (const char *);
387 extern void maybe_warn_string_init (tree, struct c_expr);
388 extern void start_init (tree, tree, int);
389 extern void finish_init (void);
390 extern void really_start_incremental_init (tree);
391 extern void push_init_level (int);
392 extern struct c_expr pop_init_level (int);
393 extern void set_init_index (tree, tree);
394 extern void set_init_label (tree);
395 extern void process_init_element (struct c_expr);
396 extern tree build_compound_literal (tree, tree);
397 extern void pedwarn_c90 (const char *, ...) ATTRIBUTE_PRINTF_1;
398 extern void pedwarn_c99 (const char *, ...) ATTRIBUTE_PRINTF_1;
399 extern tree c_start_case (tree);
400 extern void c_finish_case (tree);
401 extern tree build_asm_expr (tree, tree, tree, tree, bool);
402 extern tree build_asm_stmt (tree, tree);
403 extern tree c_convert_parm_for_inlining (tree, tree, tree, int);
404 extern int c_types_compatible_p (tree, tree);
405 extern tree c_begin_compound_stmt (bool);
406 extern tree c_end_compound_stmt (tree, bool);
407 extern void c_finish_if_stmt (location_t, tree, tree, tree, bool);
408 extern void c_finish_loop (location_t, tree, tree, tree, tree, tree, bool);
409 extern tree c_begin_stmt_expr (void);
410 extern tree c_finish_stmt_expr (tree);
411 extern tree c_process_expr_stmt (tree);
412 extern tree c_finish_expr_stmt (tree);
413 extern tree c_finish_return (tree);
414 extern tree c_finish_bc_stmt (tree *, bool);
415 extern tree c_finish_goto_label (tree);
416 extern tree c_finish_goto_ptr (tree);
418 /* Set to 0 at beginning of a function definition, set to 1 if
419 a return statement that specifies a return value is seen. */
421 extern int current_function_returns_value;
423 /* Set to 0 at beginning of a function definition, set to 1 if
424 a return statement with no argument is seen. */
426 extern int current_function_returns_null;
428 /* Set to 0 at beginning of a function definition, set to 1 if
429 a call to a noreturn function is seen. */
431 extern int current_function_returns_abnormally;
433 /* Nonzero means we are reading code that came from a system header file. */
435 extern int system_header_p;
437 /* True means global_bindings_p should return false even if the scope stack
438 says we are in file scope. */
440 extern bool c_override_global_bindings_to_false;
442 /* True means we've initialized exception handling. */
443 extern bool c_eh_initialized_p;
446 extern void c_finish_incomplete_decl (tree);
447 extern void c_write_global_declarations (void);
449 /* In order for the format checking to accept the C frontend
450 diagnostic framework extensions, you must include this file before
451 toplev.h, not after. */
452 #define GCC_DIAG_STYLE __gcc_cdiag__
454 #endif /* ! GCC_C_TREE_H */