1 /* Definitions for C parsing and type checking.
2 Copyright (C) 1987, 1993, 1994, 1995, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004, 2005 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(())
47 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only. */
48 #define C_TYPE_FIELDS_READONLY(TYPE) TREE_LANG_FLAG_1 (TYPE)
50 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile. */
51 #define C_TYPE_FIELDS_VOLATILE(TYPE) TREE_LANG_FLAG_2 (TYPE)
53 /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
54 nonzero if the definition of the type has already started. */
55 #define C_TYPE_BEING_DEFINED(TYPE) TYPE_LANG_FLAG_0 (TYPE)
57 /* In an incomplete RECORD_TYPE or UNION_TYPE, a list of variable
58 declarations whose type would be completed by completing that type. */
59 #define C_TYPE_INCOMPLETE_VARS(TYPE) TYPE_VFIELD (TYPE)
61 /* In an IDENTIFIER_NODE, nonzero if this identifier is actually a
62 keyword. C_RID_CODE (node) is then the RID_* value of the keyword,
63 and C_RID_YYCODE is the token number wanted by Yacc. */
64 #define C_IS_RESERVED_WORD(ID) TREE_LANG_FLAG_0 (ID)
66 struct lang_type
GTY(())
68 /* In a RECORD_TYPE, a sorted array of the fields of the type. */
69 struct sorted_fields_type
* GTY ((reorder ("resort_sorted_fields"))) s
;
70 /* In an ENUMERAL_TYPE, the min and max values. */
73 /* In a RECORD_TYPE, information specific to Objective-C, such
74 as a list of adopted protocols or a pointer to a corresponding
75 @interface. See objc/objc-act.h for details. */
79 /* Record whether a type or decl was written with nonconstant size.
80 Note that TYPE_SIZE may have simplified to a constant. */
81 #define C_TYPE_VARIABLE_SIZE(TYPE) TYPE_LANG_FLAG_1 (TYPE)
82 #define C_DECL_VARIABLE_SIZE(TYPE) DECL_LANG_FLAG_0 (TYPE)
84 /* Record whether a typedef for type `int' was actually `signed int'. */
85 #define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP)
87 /* For a FUNCTION_DECL, nonzero if it was defined without an explicit
89 #define C_FUNCTION_IMPLICIT_INT(EXP) DECL_LANG_FLAG_1 (EXP)
91 /* For a FUNCTION_DECL, nonzero if it was an implicit declaration. */
92 #define C_DECL_IMPLICIT(EXP) DECL_LANG_FLAG_2 (EXP)
94 /* For FUNCTION_DECLs, evaluates true if the decl is built-in but has
96 #define C_DECL_DECLARED_BUILTIN(EXP) DECL_LANG_FLAG_3 (EXP)
98 /* Record whether a decl was declared register. This is strictly a
99 front-end flag, whereas DECL_REGISTER is used for code generation;
100 they may differ for structures with volatile fields. */
101 #define C_DECL_REGISTER(EXP) DECL_LANG_FLAG_4 (EXP)
103 /* Record whether a decl was used in an expression anywhere except an
104 unevaluated operand of sizeof / typeof / alignof. This is only
105 used for functions declared static but not defined, though outside
106 sizeof and typeof it is set for other function decls as well. */
107 #define C_DECL_USED(EXP) DECL_LANG_FLAG_5 (EXP)
109 /* Record whether a label was defined in a statement expression which
110 has finished and so can no longer be jumped to. */
111 #define C_DECL_UNJUMPABLE_STMT_EXPR(EXP) \
112 DECL_LANG_FLAG_6 (LABEL_DECL_CHECK (EXP))
114 /* Record whether a label was the subject of a goto from outside the
115 current level of statement expression nesting and so cannot be
116 defined right now. */
117 #define C_DECL_UNDEFINABLE_STMT_EXPR(EXP) \
118 DECL_LANG_FLAG_7 (LABEL_DECL_CHECK (EXP))
120 /* Nonzero for a decl which either doesn't exist or isn't a prototype.
121 N.B. Could be simplified if all built-in decls had complete prototypes
122 (but this is presently difficult because some of them need FILE*). */
123 #define C_DECL_ISNT_PROTOTYPE(EXP) \
125 || (TYPE_ARG_TYPES (TREE_TYPE (EXP)) == 0 \
126 && !DECL_BUILT_IN (EXP)))
128 /* For FUNCTION_TYPE, a hidden list of types of arguments. The same as
129 TYPE_ARG_TYPES for functions with prototypes, but created for functions
130 without prototypes. */
131 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_LANG_SLOT_1 (NODE)
133 /* Record parser information about an expression that is irrelevant
134 for code generation alongside a tree representing its value. */
137 /* The value of the expression. */
139 /* Record the original binary operator of an expression, which may
140 have been changed by fold, STRING_CST for unparenthesized string
141 constants, or ERROR_MARK for other expressions (including
142 parenthesized expressions). */
143 enum tree_code original_code
;
146 /* A kind of type specifier. Note that this information is currently
147 only used to distinguish tag definitions, tag references and typeof
149 enum c_typespec_kind
{
150 /* A reserved keyword type specifier. */
152 /* A reference to a tag, previously declared, such as "struct foo".
153 This includes where the previous declaration was as a different
154 kind of tag, in which case this is only valid if shadowing that
155 tag in an inner scope. */
157 /* A reference to a tag, not previously declared in a visible
160 /* A definition of a tag such as "struct foo { int a; }". */
162 /* A typedef name. */
164 /* An ObjC-specific kind of type specifier. */
166 /* A typeof specifier. */
170 /* A type specifier: this structure is created in the parser and
171 passed to declspecs_add_type only. */
173 /* What kind of type specifier this is. */
174 enum c_typespec_kind kind
;
175 /* The specifier itself. */
179 /* A storage class specifier. */
180 enum c_storage_class
{
189 /* A type specifier keyword "void", "_Bool", "char", "int", "float",
190 "double", or none of these. */
191 enum c_typespec_keyword
{
201 /* A sequence of declaration specifiers in C. */
203 /* The type specified, if a single type specifier such as a struct,
204 union or enum specifier, typedef name or typeof specifies the
205 whole type, or NULL_TREE if none or a keyword such as "void" or
206 "char" is used. Does not include qualifiers. */
208 /* The attributes from a typedef decl. */
210 /* When parsing, the attributes. Outside the parser, this will be
211 NULL; attributes (possibly from multiple lists) will be passed
214 /* Any type specifier keyword used such as "int", not reflecting
215 modifiers such as "short", or cts_none if none. */
216 enum c_typespec_keyword typespec_word
;
217 /* The storage class specifier, or csc_none if none. */
218 enum c_storage_class storage_class
;
219 /* Whether any declaration specifiers have been seen at all. */
220 BOOL_BITFIELD declspecs_seen_p
: 1;
221 /* Whether a type specifier has been seen. */
222 BOOL_BITFIELD type_seen_p
: 1;
223 /* Whether something other than a storage class specifier or
224 attribute has been seen. This is used to warn for the
225 obsolescent usage of storage class specifiers other than at the
226 start of the list. (Doing this properly would require function
227 specifiers to be handled separately from storage class
229 BOOL_BITFIELD non_sc_seen_p
: 1;
230 /* Whether the type is specified by a typedef or typeof name. */
231 BOOL_BITFIELD typedef_p
: 1;
232 /* Whether a struct, union or enum type either had its content
233 defined by a type specifier in the list or was the first visible
234 declaration of its tag. */
235 BOOL_BITFIELD tag_defined_p
: 1;
236 /* Whether the type is explicitly "signed" or specified by a typedef
237 whose type is explicitly "signed". */
238 BOOL_BITFIELD explicit_signed_p
: 1;
239 /* Whether the specifiers include a deprecated typedef. */
240 BOOL_BITFIELD deprecated_p
: 1;
241 /* Whether the type defaulted to "int" because there were no type
243 BOOL_BITFIELD default_int_p
;
244 /* Whether "long" was specified. */
245 BOOL_BITFIELD long_p
: 1;
246 /* Whether "long" was specified more than once. */
247 BOOL_BITFIELD long_long_p
: 1;
248 /* Whether "short" was specified. */
249 BOOL_BITFIELD short_p
: 1;
250 /* Whether "signed" was specified. */
251 BOOL_BITFIELD signed_p
: 1;
252 /* Whether "unsigned" was specified. */
253 BOOL_BITFIELD unsigned_p
: 1;
254 /* Whether "complex" was specified. */
255 BOOL_BITFIELD complex_p
: 1;
256 /* Whether "inline" was specified. */
257 BOOL_BITFIELD inline_p
: 1;
258 /* Whether "__thread" was specified. */
259 BOOL_BITFIELD thread_p
: 1;
260 /* Whether "const" was specified. */
261 BOOL_BITFIELD const_p
: 1;
262 /* Whether "volatile" was specified. */
263 BOOL_BITFIELD volatile_p
: 1;
264 /* Whether "restrict" was specified. */
265 BOOL_BITFIELD restrict_p
: 1;
268 /* The various kinds of declarators in C. */
269 enum c_declarator_kind
{
278 /* Parenthesized declarator with nested attributes. */
282 /* Information about the parameters in a function declarator. */
284 /* A list of parameter decls. */
286 /* A list of structure, union and enum tags defined. */
288 /* A list of argument types to go in the FUNCTION_TYPE. */
290 /* A list of non-parameter decls (notably enumeration constants)
291 defined with the parameters. */
296 struct c_declarator
{
297 /* The kind of declarator. */
298 enum c_declarator_kind kind
;
299 /* Except for cdk_id, the contained declarator. For cdk_id, NULL. */
300 struct c_declarator
*declarator
;
301 location_t id_loc
; /* Currently only set for cdk_id. */
303 /* For identifiers, an IDENTIFIER_NODE or NULL_TREE if an abstract
307 struct c_arg_info
*arg_info
;
310 /* The array dimension, or NULL for [] and [*]. */
312 /* The qualifiers inside []. */
314 /* The attributes (currently ignored) inside []. */
316 /* Whether [static] was used. */
317 BOOL_BITFIELD static_p
: 1;
318 /* Whether [*] was used. */
319 BOOL_BITFIELD vla_unspec_p
: 1;
321 /* For pointers, the qualifiers on the pointer type. */
323 /* For attributes. */
330 /* The declaration specifiers. */
331 struct c_declspecs
*specs
;
332 /* The declarator. */
333 struct c_declarator
*declarator
;
338 /* The declaration specifiers, minus any prefix attributes. */
339 struct c_declspecs
*specs
;
340 /* The attributes. */
342 /* The declarator. */
343 struct c_declarator
*declarator
;
346 /* Save and restore the variables in this file and elsewhere
347 that keep track of the progress of compilation of the current function.
348 Used for nested functions. */
350 struct language_function
GTY(())
352 struct c_language_function base
;
355 struct c_switch
* GTY((skip
)) x_switch_stack
;
356 struct c_arg_info
* GTY((skip
)) arg_info
;
359 int returns_abnormally
;
360 int warn_about_return_type
;
364 /* Save lists of labels used or defined in particular statement
365 expression contexts. Allocated on the parser obstack. */
369 /* The label at the head of the list. */
371 /* The rest of the list. */
372 struct c_label_list
*next
;
375 struct c_label_context
377 /* The labels defined at this level of nesting. */
378 struct c_label_list
*labels_def
;
379 /* The labels used at this level of nesting. */
380 struct c_label_list
*labels_used
;
381 /* The next outermost context. */
382 struct c_label_context
*next
;
387 extern void c_parse_init (void);
389 /* in c-aux-info.c */
390 extern void gen_aux_info_record (tree
, int, int, int);
393 extern struct obstack parser_obstack
;
394 extern tree c_break_label
;
395 extern tree c_cont_label
;
397 extern int global_bindings_p (void);
398 extern void push_scope (void);
399 extern tree
pop_scope (void);
400 extern void insert_block (tree
);
401 extern tree
pushdecl (tree
);
402 extern void c_expand_body (tree
);
404 extern void c_init_decl_processing (void);
405 extern void c_dup_lang_specific_decl (tree
);
406 extern void c_print_identifier (FILE *, tree
, int);
407 extern int quals_from_declspecs (const struct c_declspecs
*);
408 extern struct c_declarator
*build_array_declarator (tree
, struct c_declspecs
*,
410 extern tree
build_enumerator (tree
, tree
);
411 extern void check_for_loop_decls (void);
412 extern void mark_forward_parm_decls (void);
413 extern void declare_parm_level (void);
414 extern void undeclared_variable (tree
, location_t
);
415 extern tree
declare_label (tree
);
416 extern tree
define_label (location_t
, tree
);
417 extern void finish_decl (tree
, tree
, tree
);
418 extern tree
finish_enum (tree
, tree
, tree
);
419 extern void finish_function (void);
420 extern tree
finish_struct (tree
, tree
, tree
);
421 extern struct c_arg_info
*get_parm_info (bool);
422 extern tree
grokfield (struct c_declarator
*, struct c_declspecs
*, tree
);
423 extern tree
groktypename (struct c_type_name
*);
424 extern tree
grokparm (const struct c_parm
*);
425 extern tree
implicitly_declare (tree
);
426 extern void keep_next_level (void);
427 extern tree
lookup_name (tree
);
428 extern void pending_xref_error (void);
429 extern void c_push_function_context (struct function
*);
430 extern void c_pop_function_context (struct function
*);
431 extern void push_parm_decl (const struct c_parm
*);
432 extern tree
pushdecl_top_level (tree
);
433 extern struct c_declarator
*set_array_declarator_inner (struct c_declarator
*,
434 struct c_declarator
*,
436 extern tree
builtin_function (const char *, tree
, int, enum built_in_class
,
438 extern void shadow_tag (const struct c_declspecs
*);
439 extern void shadow_tag_warned (const struct c_declspecs
*, int);
440 extern tree
start_enum (tree
);
441 extern int start_function (struct c_declspecs
*, struct c_declarator
*, tree
);
442 extern tree
start_decl (struct c_declarator
*, struct c_declspecs
*, bool,
444 extern tree
start_struct (enum tree_code
, tree
);
445 extern void store_parm_decls (void);
446 extern void store_parm_decls_from (struct c_arg_info
*);
447 extern tree
xref_tag (enum tree_code
, tree
);
448 extern struct c_typespec
parser_xref_tag (enum tree_code
, tree
);
449 extern int c_expand_decl (tree
);
450 extern struct c_parm
*build_c_parm (struct c_declspecs
*, tree
,
451 struct c_declarator
*);
452 extern struct c_declarator
*build_attrs_declarator (tree
,
453 struct c_declarator
*);
454 extern struct c_declarator
*build_function_declarator (struct c_arg_info
*,
455 struct c_declarator
*);
456 extern struct c_declarator
*build_id_declarator (tree
);
457 extern struct c_declarator
*make_pointer_declarator (struct c_declspecs
*,
458 struct c_declarator
*);
459 extern struct c_declspecs
*build_null_declspecs (void);
460 extern struct c_declspecs
*declspecs_add_qual (struct c_declspecs
*, tree
);
461 extern struct c_declspecs
*declspecs_add_type (struct c_declspecs
*,
463 extern struct c_declspecs
*declspecs_add_scspec (struct c_declspecs
*, tree
);
464 extern struct c_declspecs
*declspecs_add_attrs (struct c_declspecs
*, tree
);
465 extern struct c_declspecs
*finish_declspecs (struct c_declspecs
*);
467 /* in c-objc-common.c */
468 extern int c_disregard_inline_limits (tree
);
469 extern int c_cannot_inline_tree_fn (tree
*);
470 extern bool c_objc_common_init (void);
471 extern bool c_missing_noreturn_ok_p (tree
);
472 extern tree
c_objc_common_truthvalue_conversion (tree expr
);
473 extern bool c_warn_unused_global_decl (tree
);
474 extern void c_initialize_diagnostics (diagnostic_context
*);
476 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P) \
477 c_build_qualified_type ((TYPE), \
478 ((CONST_P) ? TYPE_QUAL_CONST : 0) | \
479 ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
482 extern int in_alignof
;
483 extern int in_sizeof
;
484 extern int in_typeof
;
486 extern struct c_switch
*c_switch_stack
;
487 extern struct c_label_context
*label_context_stack
;
489 extern tree
require_complete_type (tree
);
490 extern int same_translation_unit_p (tree
, tree
);
491 extern int comptypes (tree
, tree
);
492 extern bool c_mark_addressable (tree
);
493 extern void c_incomplete_type_error (tree
, tree
);
494 extern tree
c_type_promotes_to (tree
);
495 extern tree
default_conversion (tree
);
496 extern tree
composite_type (tree
, tree
);
497 extern tree
build_component_ref (tree
, tree
);
498 extern tree
build_indirect_ref (tree
, const char *);
499 extern tree
build_array_ref (tree
, tree
);
500 extern tree
build_external_ref (tree
, int, location_t
);
501 extern void pop_maybe_used (bool);
502 extern struct c_expr
c_expr_sizeof_expr (struct c_expr
);
503 extern struct c_expr
c_expr_sizeof_type (struct c_type_name
*);
504 extern struct c_expr
parser_build_binary_op (enum tree_code
, struct c_expr
,
506 extern tree
build_conditional_expr (tree
, tree
, tree
);
507 extern tree
build_compound_expr (tree
, tree
);
508 extern tree
c_cast_expr (struct c_type_name
*, tree
);
509 extern tree
build_c_cast (tree
, tree
);
510 extern tree
build_modify_expr (tree
, enum tree_code
, tree
);
511 extern void store_init_value (tree
, tree
);
512 extern void error_init (const char *);
513 extern void pedwarn_init (const char *);
514 extern void maybe_warn_string_init (tree
, struct c_expr
);
515 extern void start_init (tree
, tree
, int);
516 extern void finish_init (void);
517 extern void really_start_incremental_init (tree
);
518 extern void push_init_level (int);
519 extern struct c_expr
pop_init_level (int);
520 extern void set_init_index (tree
, tree
);
521 extern void set_init_label (tree
);
522 extern void process_init_element (struct c_expr
);
523 extern tree
build_compound_literal (tree
, tree
);
524 extern tree
c_start_case (tree
);
525 extern void c_finish_case (tree
);
526 extern tree
build_asm_expr (tree
, tree
, tree
, tree
, bool);
527 extern tree
build_asm_stmt (tree
, tree
);
528 extern tree
c_convert_parm_for_inlining (tree
, tree
, tree
, int);
529 extern int c_types_compatible_p (tree
, tree
);
530 extern tree
c_begin_compound_stmt (bool);
531 extern tree
c_end_compound_stmt (tree
, bool);
532 extern void c_finish_if_stmt (location_t
, tree
, tree
, tree
, bool);
533 extern void c_finish_loop (location_t
, tree
, tree
, tree
, tree
, tree
, bool);
534 extern tree
c_begin_stmt_expr (void);
535 extern tree
c_finish_stmt_expr (tree
);
536 extern tree
c_process_expr_stmt (tree
);
537 extern tree
c_finish_expr_stmt (tree
);
538 extern tree
c_finish_return (tree
);
539 extern tree
c_finish_bc_stmt (tree
*, bool);
540 extern tree
c_finish_goto_label (tree
);
541 extern tree
c_finish_goto_ptr (tree
);
543 /* Set to 0 at beginning of a function definition, set to 1 if
544 a return statement that specifies a return value is seen. */
546 extern int current_function_returns_value
;
548 /* Set to 0 at beginning of a function definition, set to 1 if
549 a return statement with no argument is seen. */
551 extern int current_function_returns_null
;
553 /* Set to 0 at beginning of a function definition, set to 1 if
554 a call to a noreturn function is seen. */
556 extern int current_function_returns_abnormally
;
558 /* Nonzero means we are reading code that came from a system header file. */
560 extern int system_header_p
;
562 /* True means global_bindings_p should return false even if the scope stack
563 says we are in file scope. */
565 extern bool c_override_global_bindings_to_false
;
567 /* True means we've initialized exception handling. */
568 extern bool c_eh_initialized_p
;
571 extern void c_finish_incomplete_decl (tree
);
572 extern void c_write_global_declarations (void);
574 /* In order for the format checking to accept the C frontend
575 diagnostic framework extensions, you must include this file before
576 toplev.h, not after. */
577 #define GCC_DIAG_STYLE __gcc_cdiag__
578 #if GCC_VERSION >= 3005
579 #define ATTRIBUTE_GCC_CDIAG(m, n) __attribute__ ((__format__ (GCC_DIAG_STYLE, m ,n))) ATTRIBUTE_NONNULL(m)
581 #define ATTRIBUTE_GCC_CDIAG(m, n) ATTRIBUTE_NONNULL(m)
584 extern void pedwarn_c90 (const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2);
585 extern void pedwarn_c99 (const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2);
587 #endif /* ! GCC_C_TREE_H */