1/* Definitions for c-common.c.
2   Copyright (C) 1987, 1993, 1994, 1995, 1997, 1998,
3   1999, 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
4
5This file is part of GCC.
6
7GCC is free software; you can redistribute it and/or modify it under
8the terms of the GNU General Public License as published by the Free
9Software Foundation; either version 2, or (at your option) any later
10version.
11
12GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13WARRANTY; without even the implied warranty of MERCHANTABILITY or
14FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
15for more details.
16
17You should have received a copy of the GNU General Public License
18along with GCC; see the file COPYING.  If not, write to the Free
19Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
2002110-1301, USA.  */
21
22#ifndef GCC_C_COMMON_H
23#define GCC_C_COMMON_H
24
25#include "splay-tree.h"
26#include "cpplib.h"
27#include "ggc.h"
28
29/* Usage of TREE_LANG_FLAG_?:
30   0: TREE_NEGATED_INT (in INTEGER_CST).
31      IDENTIFIER_MARKED (used by search routines).
32      DECL_PRETTY_FUNCTION_P (in VAR_DECL)
33   1: C_DECLARED_LABEL_FLAG (in LABEL_DECL)
34      STATEMENT_LIST_STMT_EXPR (in STATEMENT_LIST)
35   2: unused
36   3: STATEMENT_LIST_HAS_LABEL (in STATEMENT_LIST)
37   4: unused
38*/
39
40/* Reserved identifiers.  This is the union of all the keywords for C,
41   C++, and Objective-C.  All the type modifiers have to be in one
42   block at the beginning, because they are used as mask bits.  There
43   are 27 type modifiers; if we add many more we will have to redesign
44   the mask mechanism.  */
45
46enum rid
47{
48  /* Modifiers: */
49  /* C, in empirical order of frequency.  */
50  RID_STATIC = 0,
51  RID_UNSIGNED, RID_LONG,    RID_CONST, RID_EXTERN,
52  RID_REGISTER, RID_TYPEDEF, RID_SHORT, RID_INLINE,
53  RID_VOLATILE, RID_SIGNED,  RID_AUTO,  RID_RESTRICT,
54
55  /* C extensions */
56  RID_COMPLEX, RID_THREAD,
57
58  /* C++ */
59  RID_FRIEND, RID_VIRTUAL, RID_EXPLICIT, RID_EXPORT, RID_MUTABLE,
60
61  /* ObjC */
62  RID_IN, RID_OUT, RID_INOUT, RID_BYCOPY, RID_BYREF, RID_ONEWAY,
63
64  /* C */
65  RID_INT,     RID_CHAR,   RID_FLOAT,    RID_DOUBLE, RID_VOID,
66  RID_ENUM,    RID_STRUCT, RID_UNION,    RID_IF,     RID_ELSE,
67  RID_WHILE,   RID_DO,     RID_FOR,      RID_SWITCH, RID_CASE,
68  RID_DEFAULT, RID_BREAK,  RID_CONTINUE, RID_RETURN, RID_GOTO,
69  RID_SIZEOF,
70
71  /* C extensions */
72  RID_ASM,       RID_TYPEOF,   RID_ALIGNOF,  RID_ATTRIBUTE,  RID_VA_ARG,
73  RID_EXTENSION, RID_IMAGPART, RID_REALPART, RID_LABEL,      RID_CHOOSE_EXPR,
74  RID_TYPES_COMPATIBLE_P,      RID_BUILTIN_COMPLEX,
75  RID_DFLOAT32, RID_DFLOAT64, RID_DFLOAT128,
76
77  /* Too many ways of getting the name of a function as a string */
78  RID_FUNCTION_NAME, RID_PRETTY_FUNCTION_NAME, RID_C99_FUNCTION_NAME,
79
80  /* C++ */
81  RID_BOOL,     RID_WCHAR,    RID_CLASS,
82  RID_PUBLIC,   RID_PRIVATE,  RID_PROTECTED,
83  RID_TEMPLATE, RID_NULL,     RID_CATCH,
84  RID_DELETE,   RID_FALSE,    RID_NAMESPACE,
85  RID_NEW,      RID_OFFSETOF, RID_OPERATOR,
86  RID_THIS,     RID_THROW,    RID_TRUE,
87  RID_TRY,      RID_TYPENAME, RID_TYPEID,
88  RID_USING,
89
90  /* casts */
91  RID_CONSTCAST, RID_DYNCAST, RID_REINTCAST, RID_STATCAST,
92
93  /* Objective-C */
94  RID_AT_ENCODE,   RID_AT_END,
95  RID_AT_CLASS,    RID_AT_ALIAS,     RID_AT_DEFS,
96  RID_AT_PRIVATE,  RID_AT_PROTECTED, RID_AT_PUBLIC,
97  RID_AT_PROTOCOL, RID_AT_SELECTOR,
98  RID_AT_THROW,	   RID_AT_TRY,       RID_AT_CATCH,
99  RID_AT_FINALLY,  RID_AT_SYNCHRONIZED,
100  RID_AT_INTERFACE,
101  RID_AT_IMPLEMENTATION,
102
103  RID_MAX,
104
105  RID_FIRST_MODIFIER = RID_STATIC,
106  RID_LAST_MODIFIER = RID_ONEWAY,
107
108  RID_FIRST_AT = RID_AT_ENCODE,
109  RID_LAST_AT = RID_AT_IMPLEMENTATION,
110  RID_FIRST_PQ = RID_IN,
111  RID_LAST_PQ = RID_ONEWAY
112};
113
114#define OBJC_IS_AT_KEYWORD(rid) \
115  ((unsigned int) (rid) >= (unsigned int) RID_FIRST_AT && \
116   (unsigned int) (rid) <= (unsigned int) RID_LAST_AT)
117
118#define OBJC_IS_PQ_KEYWORD(rid) \
119  ((unsigned int) (rid) >= (unsigned int) RID_FIRST_PQ && \
120   (unsigned int) (rid) <= (unsigned int) RID_LAST_PQ)
121
122/* The elements of `ridpointers' are identifier nodes for the reserved
123   type names and storage classes.  It is indexed by a RID_... value.  */
124extern GTY ((length ("(int) RID_MAX"))) tree *ridpointers;
125
126/* Standard named or nameless data types of the C compiler.  */
127
128enum c_tree_index
129{
130    CTI_WCHAR_TYPE,
131    CTI_SIGNED_WCHAR_TYPE,
132    CTI_UNSIGNED_WCHAR_TYPE,
133    CTI_WINT_TYPE,
134    CTI_SIGNED_SIZE_TYPE, /* For format checking only.  */
135    CTI_UNSIGNED_PTRDIFF_TYPE, /* For format checking only.  */
136    CTI_INTMAX_TYPE,
137    CTI_UINTMAX_TYPE,
138    CTI_WIDEST_INT_LIT_TYPE,
139    CTI_WIDEST_UINT_LIT_TYPE,
140
141    CTI_CHAR_ARRAY_TYPE,
142    CTI_WCHAR_ARRAY_TYPE,
143    CTI_INT_ARRAY_TYPE,
144    CTI_STRING_TYPE,
145    CTI_CONST_STRING_TYPE,
146
147    /* Type for boolean expressions (bool in C++, int in C).  */
148    CTI_TRUTHVALUE_TYPE,
149    CTI_TRUTHVALUE_TRUE,
150    CTI_TRUTHVALUE_FALSE,
151
152    CTI_DEFAULT_FUNCTION_TYPE,
153
154    /* These are not types, but we have to look them up all the time.  */
155    CTI_FUNCTION_NAME_DECL,
156    CTI_PRETTY_FUNCTION_NAME_DECL,
157    CTI_C99_FUNCTION_NAME_DECL,
158    CTI_SAVED_FUNCTION_NAME_DECLS,
159
160    CTI_VOID_ZERO,
161
162    CTI_NULL,
163
164    CTI_MAX
165};
166
167#define C_RID_CODE(id)	(((struct c_common_identifier *) (id))->node.rid_code)
168
169/* Identifier part common to the C front ends.  Inherits from
170   tree_identifier, despite appearances.  */
171struct c_common_identifier GTY(())
172{
173  struct tree_common common;
174  struct cpp_hashnode node;
175};
176
177#define wchar_type_node			c_global_trees[CTI_WCHAR_TYPE]
178#define signed_wchar_type_node		c_global_trees[CTI_SIGNED_WCHAR_TYPE]
179#define unsigned_wchar_type_node	c_global_trees[CTI_UNSIGNED_WCHAR_TYPE]
180#define wint_type_node			c_global_trees[CTI_WINT_TYPE]
181#define signed_size_type_node		c_global_trees[CTI_SIGNED_SIZE_TYPE]
182#define unsigned_ptrdiff_type_node	c_global_trees[CTI_UNSIGNED_PTRDIFF_TYPE]
183#define intmax_type_node		c_global_trees[CTI_INTMAX_TYPE]
184#define uintmax_type_node		c_global_trees[CTI_UINTMAX_TYPE]
185#define widest_integer_literal_type_node c_global_trees[CTI_WIDEST_INT_LIT_TYPE]
186#define widest_unsigned_literal_type_node c_global_trees[CTI_WIDEST_UINT_LIT_TYPE]
187
188#define truthvalue_type_node		c_global_trees[CTI_TRUTHVALUE_TYPE]
189#define truthvalue_true_node		c_global_trees[CTI_TRUTHVALUE_TRUE]
190#define truthvalue_false_node		c_global_trees[CTI_TRUTHVALUE_FALSE]
191
192#define char_array_type_node		c_global_trees[CTI_CHAR_ARRAY_TYPE]
193#define wchar_array_type_node		c_global_trees[CTI_WCHAR_ARRAY_TYPE]
194#define int_array_type_node		c_global_trees[CTI_INT_ARRAY_TYPE]
195#define string_type_node		c_global_trees[CTI_STRING_TYPE]
196#define const_string_type_node		c_global_trees[CTI_CONST_STRING_TYPE]
197
198#define default_function_type		c_global_trees[CTI_DEFAULT_FUNCTION_TYPE]
199
200#define function_name_decl_node		c_global_trees[CTI_FUNCTION_NAME_DECL]
201#define pretty_function_name_decl_node	c_global_trees[CTI_PRETTY_FUNCTION_NAME_DECL]
202#define c99_function_name_decl_node		c_global_trees[CTI_C99_FUNCTION_NAME_DECL]
203#define saved_function_name_decls	c_global_trees[CTI_SAVED_FUNCTION_NAME_DECLS]
204
205/* A node for `((void) 0)'.  */
206#define void_zero_node                  c_global_trees[CTI_VOID_ZERO]
207
208/* The node for C++ `__null'.  */
209#define null_node                       c_global_trees[CTI_NULL]
210
211extern GTY(()) tree c_global_trees[CTI_MAX];
212
213/* In a RECORD_TYPE, a sorted array of the fields of the type, not a
214   tree for size reasons.  */
215struct sorted_fields_type GTY(())
216{
217  int len;
218  tree GTY((length ("%h.len"))) elts[1];
219};
220
221/* Mark which labels are explicitly declared.
222   These may be shadowed, and may be referenced from nested functions.  */
223#define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
224
225typedef enum c_language_kind
226{
227  clk_c		= 0,		/* C90, C94 or C99 */
228  clk_objc	= 1,		/* clk_c with ObjC features.  */
229  clk_cxx	= 2,		/* ANSI/ISO C++ */
230  clk_objcxx	= 3		/* clk_cxx with ObjC features.  */
231}
232c_language_kind;
233
234/* To test for a specific language use c_language, defined by each
235   front end.  For "ObjC features" or "not C++" use the macros.  */
236extern c_language_kind c_language;
237
238#define c_dialect_cxx()		(c_language & clk_cxx)
239#define c_dialect_objc()	(c_language & clk_objc)
240
241/* Information about a statement tree.  */
242
243struct stmt_tree_s GTY(()) {
244  /* The current statement list being collected.  */
245  tree x_cur_stmt_list;
246
247  /* In C++, Nonzero if we should treat statements as full
248     expressions.  In particular, this variable is no-zero if at the
249     end of a statement we should destroy any temporaries created
250     during that statement.  Similarly, if, at the end of a block, we
251     should destroy any local variables in this block.  Normally, this
252     variable is nonzero, since those are the normal semantics of
253     C++.
254
255     However, in order to represent aggregate initialization code as
256     tree structure, we use statement-expressions.  The statements
257     within the statement expression should not result in cleanups
258     being run until the entire enclosing statement is complete.
259
260     This flag has no effect in C.  */
261  int stmts_are_full_exprs_p;
262};
263
264typedef struct stmt_tree_s *stmt_tree;
265
266/* Global state pertinent to the current function.  Some C dialects
267   extend this structure with additional fields.  */
268
269struct c_language_function GTY(()) {
270  /* While we are parsing the function, this contains information
271     about the statement-tree that we are building.  */
272  struct stmt_tree_s x_stmt_tree;
273};
274
275/* When building a statement-tree, this is the current statement list
276   being collected.  It's TREE_CHAIN is a back-pointer to the previous
277   statement list.  */
278
279#define cur_stmt_list (current_stmt_tree ()->x_cur_stmt_list)
280
281/* Language-specific hooks.  */
282
283/* Callback that determines if it's ok for a function to have no
284   noreturn attribute.  */
285extern int (*lang_missing_noreturn_ok_p) (tree);
286
287/* If non-NULL, this function is called after a precompile header file
288   is loaded.  */
289extern void (*lang_post_pch_load) (void);
290
291extern void push_file_scope (void);
292extern void pop_file_scope (void);
293extern stmt_tree current_stmt_tree (void);
294extern tree push_stmt_list (void);
295extern tree pop_stmt_list (tree);
296extern tree add_stmt (tree);
297extern void push_cleanup (tree, tree, bool);
298extern tree pushdecl_top_level (tree);
299extern tree pushdecl (tree);
300extern tree build_modify_expr (tree, enum tree_code, tree);
301extern tree build_indirect_ref (tree, const char *);
302
303extern int c_expand_decl (tree);
304
305extern int field_decl_cmp (const void *, const void *);
306extern void resort_sorted_fields (void *, void *, gt_pointer_operator,
307				  void *);
308extern bool has_c_linkage (tree decl);
309
310/* Switches common to the C front ends.  */
311
312/* Nonzero if prepreprocessing only.  */
313
314extern int flag_preprocess_only;
315
316/* Zero means that faster, ...NonNil variants of objc_msgSend...
317   calls will be used in ObjC; passing nil receivers to such calls
318   will most likely result in crashes.  */
319extern int flag_nil_receivers;
320
321/* Nonzero means that we will allow new ObjC exception syntax (@throw,
322   @try, etc.) in source code.  */
323extern int flag_objc_exceptions;
324
325/* Nonzero means that we generate NeXT setjmp based exceptions.  */
326extern int flag_objc_sjlj_exceptions;
327
328/* Nonzero means that code generation will be altered to support
329   "zero-link" execution.  This currently affects ObjC only, but may
330   affect other languages in the future.  */
331extern int flag_zero_link;
332
333/* Nonzero means emit an '__OBJC, __image_info' for the current translation
334   unit.  It will inform the ObjC runtime that class definition(s) herein
335   contained are to replace one(s) previously loaded.  */
336extern int flag_replace_objc_classes;
337
338/* Nonzero means don't output line number information.  */
339
340extern char flag_no_line_commands;
341
342/* Nonzero causes -E output not to be done, but directives such as
343   #define that have side effects are still obeyed.  */
344
345extern char flag_no_output;
346
347/* Nonzero means dump macros in some fashion; contains the 'D', 'M' or
348   'N' of the command line switch.  */
349
350extern char flag_dump_macros;
351
352/* Nonzero means pass #include lines through to the output.  */
353
354extern char flag_dump_includes;
355
356/* Nonzero means process PCH files while preprocessing.  */
357
358extern bool flag_pch_preprocess;
359
360/* The file name to which we should write a precompiled header, or
361   NULL if no header will be written in this compile.  */
362
363extern const char *pch_file;
364
365/* Nonzero if an ISO standard was selected.  It rejects macros in the
366   user's namespace.  */
367
368extern int flag_iso;
369
370/* Nonzero if -undef was given.  It suppresses target built-in macros
371   and assertions.  */
372
373extern int flag_undef;
374
375/* Nonzero means don't recognize the non-ANSI builtin functions.  */
376
377extern int flag_no_builtin;
378
379/* Nonzero means don't recognize the non-ANSI builtin functions.
380   -ansi sets this.  */
381
382extern int flag_no_nonansi_builtin;
383
384/* Nonzero means give `double' the same size as `float'.  */
385
386extern int flag_short_double;
387
388/* Nonzero means give `wchar_t' the same size as `short'.  */
389
390extern int flag_short_wchar;
391
392/* Nonzero means allow Microsoft extensions without warnings or errors.  */
393extern int flag_ms_extensions;
394
395/* Nonzero means don't recognize the keyword `asm'.  */
396
397extern int flag_no_asm;
398
399/* Nonzero means give string constants the type `const char *', as mandated
400   by the standard.  */
401
402extern int flag_const_strings;
403
404/* Nonzero means to treat bitfields as signed unless they say `unsigned'.  */
405
406extern int flag_signed_bitfields;
407
408/* Warn about #pragma directives that are not recognized.  */
409
410extern int warn_unknown_pragmas; /* Tri state variable.  */
411
412/* Warn about format/argument anomalies in calls to formatted I/O functions
413   (*printf, *scanf, strftime, strfmon, etc.).  */
414
415extern int warn_format;
416
417/* C/ObjC language option variables.  */
418
419
420/* Nonzero means allow type mismatches in conditional expressions;
421   just make their values `void'.  */
422
423extern int flag_cond_mismatch;
424
425/* Nonzero means enable C89 Amendment 1 features.  */
426
427extern int flag_isoc94;
428
429/* Nonzero means use the ISO C99 dialect of C.  */
430
431extern int flag_isoc99;
432
433/* Nonzero means that we have builtin functions, and main is an int.  */
434
435extern int flag_hosted;
436
437/* Warn if main is suspicious.  */
438
439extern int warn_main;
440
441
442/* ObjC language option variables.  */
443
444
445/* Open and close the file for outputting class declarations, if
446   requested (ObjC).  */
447
448extern int flag_gen_declaration;
449
450/* Tells the compiler that this is a special run.  Do not perform any
451   compiling, instead we are to test some platform dependent features
452   and output a C header file with appropriate definitions.  */
453
454extern int print_struct_values;
455
456/* ???.  Undocumented.  */
457
458extern const char *constant_string_class_name;
459
460
461/* C++ language option variables.  */
462
463
464/* Nonzero means don't recognize any extension keywords.  */
465
466extern int flag_no_gnu_keywords;
467
468/* Nonzero means do emit exported implementations of functions even if
469   they can be inlined.  */
470
471extern int flag_implement_inlines;
472
473/* Nonzero means that implicit instantiations will be emitted if needed.  */
474
475extern int flag_implicit_templates;
476
477/* Nonzero means that implicit instantiations of inline templates will be
478   emitted if needed, even if instantiations of non-inline templates
479   aren't.  */
480
481extern int flag_implicit_inline_templates;
482
483/* Nonzero means generate separate instantiation control files and
484   juggle them at link time.  */
485
486extern int flag_use_repository;
487
488/* Nonzero if we want to issue diagnostics that the standard says are not
489   required.  */
490
491extern int flag_optional_diags;
492
493/* Nonzero means we should attempt to elide constructors when possible.  */
494
495extern int flag_elide_constructors;
496
497/* Nonzero means that member functions defined in class scope are
498   inline by default.  */
499
500extern int flag_default_inline;
501
502/* Controls whether compiler generates 'type descriptor' that give
503   run-time type information.  */
504
505extern int flag_rtti;
506
507/* Nonzero if we want to conserve space in the .o files.  We do this
508   by putting uninitialized data and runtime initialized data into
509   .common instead of .data at the expense of not flagging multiple
510   definitions.  */
511
512extern int flag_conserve_space;
513
514/* Nonzero if we want to obey access control semantics.  */
515
516extern int flag_access_control;
517
518/* Nonzero if we want to check the return value of new and avoid calling
519   constructors if it is a null pointer.  */
520
521extern int flag_check_new;
522
523/* Nonzero if we want the new ISO rules for pushing a new scope for `for'
524   initialization variables.
525   0: Old rules, set by -fno-for-scope.
526   2: New ISO rules, set by -ffor-scope.
527   1: Try to implement new ISO rules, but with backup compatibility
528   (and warnings).  This is the default, for now.  */
529
530extern int flag_new_for_scope;
531
532/* Nonzero if we want to emit defined symbols with common-like linkage as
533   weak symbols where possible, in order to conform to C++ semantics.
534   Otherwise, emit them as local symbols.  */
535
536extern int flag_weak;
537
538/* 0 means we want the preprocessor to not emit line directives for
539   the current working directory.  1 means we want it to do it.  -1
540   means we should decide depending on whether debugging information
541   is being emitted or not.  */
542
543extern int flag_working_directory;
544
545/* Nonzero to use __cxa_atexit, rather than atexit, to register
546   destructors for local statics and global objects.  */
547
548extern int flag_use_cxa_atexit;
549
550/* Nonzero to use __cxa_get_exception_ptr in the C++ exception-handling
551   logic.  */
552
553extern int flag_use_cxa_get_exception_ptr;
554
555/* Nonzero means make the default pedwarns warnings instead of errors.
556   The value of this flag is ignored if -pedantic is specified.  */
557
558extern int flag_permissive;
559
560/* Nonzero means to implement standard semantics for exception
561   specifications, calling unexpected if an exception is thrown that
562   doesn't match the specification.  Zero means to treat them as
563   assertions and optimize accordingly, but not check them.  */
564
565extern int flag_enforce_eh_specs;
566
567/* Nonzero (the default) means to generate thread-safe code for
568   initializing local statics.  */
569
570extern int flag_threadsafe_statics;
571
572/* Nonzero means warn about implicit declarations.  */
573
574extern int warn_implicit;
575
576/* Warn about using __null (as NULL in C++) as sentinel.  For code compiled
577   with GCC this doesn't matter as __null is guaranteed to have the right
578   size.  */
579
580extern int warn_strict_null_sentinel;
581
582/* Maximum template instantiation depth.  This limit is rather
583   arbitrary, but it exists to limit the time it takes to notice
584   infinite template instantiations.  */
585
586extern int max_tinst_depth;
587
588/* Nonzero means the expression being parsed will never be evaluated.
589   This is a count, since unevaluated expressions can nest.  */
590
591extern int skip_evaluation;
592
593/* C types are partitioned into three subsets: object, function, and
594   incomplete types.  */
595#define C_TYPE_OBJECT_P(type) \
596  (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
597
598#define C_TYPE_INCOMPLETE_P(type) \
599  (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
600
601#define C_TYPE_FUNCTION_P(type) \
602  (TREE_CODE (type) == FUNCTION_TYPE)
603
604/* For convenience we define a single macro to identify the class of
605   object or incomplete types.  */
606#define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
607  (!C_TYPE_FUNCTION_P (type))
608
609/* Attribute table common to the C front ends.  */
610extern const struct attribute_spec c_common_attribute_table[];
611extern const struct attribute_spec c_common_format_attribute_table[];
612
613/* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc.
614   ID is the identifier to use, NAME is the string.
615   TYPE_DEP indicates whether it depends on type of the function or not
616   (i.e. __PRETTY_FUNCTION__).  */
617
618extern tree (*make_fname_decl) (tree, int);
619
620extern tree identifier_global_value (tree);
621extern void record_builtin_type (enum rid, const char *, tree);
622extern tree build_void_list_node (void);
623extern void start_fname_decls (void);
624extern void finish_fname_decls (void);
625extern const char *fname_as_string (int);
626extern tree fname_decl (unsigned, tree);
627
628extern void check_function_arguments (tree, tree, tree);
629extern void check_function_arguments_recurse (void (*)
630					      (void *, tree,
631					       unsigned HOST_WIDE_INT),
632					      void *, tree,
633					      unsigned HOST_WIDE_INT);
634extern void check_function_format (tree, tree);
635extern void check_function_bounded (int *, tree, tree);
636extern void set_Wformat (int);
637extern tree handle_bounded_attribute (tree *, tree, tree, int, bool *);
638extern tree handle_format_attribute (tree *, tree, tree, int, bool *);
639extern tree handle_format_arg_attribute (tree *, tree, tree, int, bool *);
640extern int c_common_handle_option (size_t code, const char *arg, int value);
641extern bool c_common_missing_argument (const char *opt, size_t code);
642extern tree c_common_type_for_mode (enum machine_mode, int);
643extern tree c_common_type_for_size (unsigned int, int);
644extern tree c_common_unsigned_type (tree);
645extern tree c_common_signed_type (tree);
646extern tree c_common_signed_or_unsigned_type (int, tree);
647extern tree c_build_bitfield_integer_type (unsigned HOST_WIDE_INT, int);
648extern tree c_common_truthvalue_conversion (tree);
649extern void c_apply_type_quals_to_decl (int, tree);
650extern tree c_sizeof_or_alignof_type (tree, bool, int);
651extern tree c_alignof_expr (tree);
652/* Print an error message for invalid operands to arith operation CODE.
653   NOP_EXPR is used as a special case (see truthvalue_conversion).  */
654extern void binary_op_error (enum tree_code);
655extern tree fix_string_type (tree);
656struct varray_head_tag;
657extern void constant_expression_warning (tree);
658extern void strict_aliasing_warning(tree, tree, tree);
659extern void empty_body_warning (tree, tree);
660extern tree convert_and_check (tree, tree);
661extern void overflow_warning (tree);
662extern bool c_determine_visibility (tree);
663extern bool same_scalar_type_ignoring_signedness (tree, tree);
664
665#define c_sizeof(T)  c_sizeof_or_alignof_type (T, true, 1)
666#define c_alignof(T) c_sizeof_or_alignof_type (T, false, 1)
667
668/* Subroutine of build_binary_op, used for comparison operations.
669   See if the operands have both been converted from subword integer types
670   and, if so, perhaps change them both back to their original type.  */
671extern tree shorten_compare (tree *, tree *, tree *, enum tree_code *);
672
673extern tree pointer_int_sum (enum tree_code, tree, tree);
674extern unsigned int min_precision (tree, int);
675
676/* Add qualifiers to a type, in the fashion for C.  */
677extern tree c_build_qualified_type (tree, int);
678
679/* Build tree nodes and builtin functions common to both C and C++ language
680   frontends.  */
681extern void c_common_nodes_and_builtins (void);
682
683extern void set_builtin_user_assembler_name (tree decl, const char *asmspec);
684
685extern void disable_builtin_function (const char *);
686
687extern void set_compound_literal_name (tree decl);
688
689extern tree build_va_arg (tree, tree);
690
691extern unsigned int c_common_init_options (unsigned int, const char **);
692extern bool c_common_post_options (const char **);
693extern bool c_common_init (void);
694extern void c_common_finish (void);
695extern void c_common_parse_file (int);
696extern HOST_WIDE_INT c_common_get_alias_set (tree);
697extern void c_register_builtin_type (tree, const char*);
698extern bool c_promoting_integer_type_p (tree);
699extern int self_promoting_args_p (tree);
700extern tree strip_array_types (tree);
701extern tree strip_pointer_operator (tree);
702extern HOST_WIDE_INT c_common_to_target_charset (HOST_WIDE_INT);
703
704/* This is the basic parsing function.  */
705extern void c_parse_file (void);
706/* This is misnamed, it actually performs end-of-compilation processing.  */
707extern void finish_file	(void);
708
709
710/* These macros provide convenient access to the various _STMT nodes.  */
711
712/* Nonzero if a given STATEMENT_LIST represents the outermost binding
713   if a statement expression.  */
714#define STATEMENT_LIST_STMT_EXPR(NODE) \
715  TREE_LANG_FLAG_1 (STATEMENT_LIST_CHECK (NODE))
716
717/* Nonzero if a label has been added to the statement list.  */
718#define STATEMENT_LIST_HAS_LABEL(NODE) \
719  TREE_LANG_FLAG_3 (STATEMENT_LIST_CHECK (NODE))
720
721/* COMPOUND_LITERAL_EXPR accessors.  */
722#define COMPOUND_LITERAL_EXPR_DECL_STMT(NODE)		\
723  TREE_OPERAND (COMPOUND_LITERAL_EXPR_CHECK (NODE), 0)
724#define COMPOUND_LITERAL_EXPR_DECL(NODE)			\
725  DECL_EXPR_DECL (COMPOUND_LITERAL_EXPR_DECL_STMT (NODE))
726
727#define DEFTREECODE(SYM, NAME, TYPE, LENGTH) SYM,
728
729enum c_tree_code {
730  C_DUMMY_TREE_CODE = LAST_AND_UNUSED_TREE_CODE,
731#include "c-common.def"
732  LAST_C_TREE_CODE
733};
734
735#undef DEFTREECODE
736
737extern int anon_aggr_type_p (tree);
738
739/* For a VAR_DECL that is an anonymous union, these are the various
740   sub-variables that make up the anonymous union.  */
741#define DECL_ANON_UNION_ELEMS(NODE) DECL_ARGUMENTS ((NODE))
742
743/* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
744#define DECL_C_BIT_FIELD(NODE) \
745  (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
746#define SET_DECL_C_BIT_FIELD(NODE) \
747  (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
748#define CLEAR_DECL_C_BIT_FIELD(NODE) \
749  (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
750
751extern void emit_local_var (tree);
752extern tree do_case (tree, tree);
753extern tree build_stmt (enum tree_code, ...);
754extern tree build_case_label (tree, tree, tree);
755
756/* These functions must be defined by each front-end which implements
757   a variant of the C language.  They are used in c-common.c.  */
758
759extern tree build_unary_op (enum tree_code, tree, int);
760extern tree build_binary_op (enum tree_code, tree, tree, int);
761extern tree perform_integral_promotions (tree);
762
763/* These functions must be defined by each front-end which implements
764   a variant of the C language.  They are used by port files.  */
765
766extern tree default_conversion (tree);
767
768/* Given two integer or real types, return the type for their sum.
769   Given two compatible ANSI C types, returns the merged type.  */
770
771extern tree common_type (tree, tree);
772
773extern tree decl_constant_value (tree);
774
775/* Handle increment and decrement of boolean types.  */
776extern tree boolean_increment (enum tree_code, tree);
777
778extern int case_compare (splay_tree_key, splay_tree_key);
779
780extern tree c_add_case_label (splay_tree, tree, tree, tree, tree);
781
782extern void c_do_switch_warnings (splay_tree, location_t, tree, tree);
783
784extern tree build_function_call (tree, tree);
785
786extern tree resolve_overloaded_builtin (tree, tree);
787
788extern tree finish_label_address_expr (tree);
789
790/* Same function prototype, but the C and C++ front ends have
791   different implementations.  Used in c-common.c.  */
792extern tree lookup_label (tree);
793extern tree lookup_name (tree);
794
795extern int vector_types_convertible_p (tree t1, tree t2);
796
797extern rtx c_expand_expr (tree, rtx, enum machine_mode, int, rtx *);
798
799extern tree c_staticp (tree);
800
801extern void init_c_lex (void);
802
803extern void c_cpp_builtins (cpp_reader *);
804
805/* Positive if an implicit `extern "C"' scope has just been entered;
806   negative if such a scope has just been exited.  */
807extern GTY(()) int pending_lang_change;
808
809/* Information recorded about each file examined during compilation.  */
810
811struct c_fileinfo
812{
813  int time;	/* Time spent in the file.  */
814
815  /* Flags used only by C++.
816     INTERFACE_ONLY nonzero means that we are in an "interface" section
817     of the compiler.  INTERFACE_UNKNOWN nonzero means we cannot trust
818     the value of INTERFACE_ONLY.  If INTERFACE_UNKNOWN is zero and
819     INTERFACE_ONLY is zero, it means that we are responsible for
820     exporting definitions that others might need.  */
821  short interface_only;
822  short interface_unknown;
823};
824
825struct c_fileinfo *get_fileinfo (const char *);
826extern void dump_time_statistics (void);
827
828extern bool c_dump_tree (void *, tree);
829
830extern void c_warn_unused_result (tree *);
831
832extern void verify_sequence_points (tree);
833
834extern tree fold_offsetof (tree, tree);
835
836/* Places where an lvalue, or modifiable lvalue, may be required.
837   Used to select diagnostic messages in lvalue_error and
838   readonly_error.  */
839enum lvalue_use {
840  lv_assign,
841  lv_increment,
842  lv_decrement,
843  lv_addressof,
844  lv_asm
845};
846
847extern void lvalue_error (enum lvalue_use);
848
849extern int complete_array_type (tree *, tree, bool);
850
851extern tree builtin_type_for_size (int, bool);
852
853extern void warn_array_subscript_with_type_char (tree);
854
855/* In c-gimplify.c  */
856extern void c_genericize (tree);
857extern int c_gimplify_expr (tree *, tree *, tree *);
858extern tree c_build_bind_expr (tree, tree);
859
860/* In c-pch.c  */
861extern void pch_init (void);
862extern int c_common_valid_pch (cpp_reader *pfile, const char *name, int fd);
863extern void c_common_read_pch (cpp_reader *pfile, const char *name, int fd,
864			       const char *orig);
865extern void c_common_write_pch (void);
866extern void c_common_no_more_pch (void);
867extern void c_common_pch_pragma (cpp_reader *pfile, const char *);
868extern void c_common_print_pch_checksum (FILE *f);
869
870/* In *-checksum.c */
871extern const unsigned char executable_checksum[16];
872
873extern void builtin_define_with_value (const char *, const char *, int);
874extern void c_stddef_cpp_builtins (void);
875extern void fe_file_change (const struct line_map *);
876extern void c_parse_error (const char *, enum cpp_ttype, tree);
877
878/* Objective-C / Objective-C++ entry points.  */
879
880/* The following ObjC/ObjC++ functions are called by the C and/or C++
881   front-ends; they all must have corresponding stubs in stub-objc.c.  */
882extern tree objc_is_class_name (tree);
883extern tree objc_is_object_ptr (tree);
884extern void objc_check_decl (tree);
885extern int objc_is_reserved_word (tree);
886extern bool objc_compare_types (tree, tree, int, tree);
887extern void objc_volatilize_decl (tree);
888extern bool objc_type_quals_match (tree, tree);
889extern tree objc_rewrite_function_call (tree, tree);
890extern tree objc_message_selector (void);
891extern tree objc_lookup_ivar (tree, tree);
892extern void objc_clear_super_receiver (void);
893extern int objc_is_public (tree, tree);
894extern tree objc_is_id (tree);
895extern void objc_declare_alias (tree, tree);
896extern void objc_declare_class (tree);
897extern void objc_declare_protocols (tree);
898extern tree objc_build_message_expr (tree);
899extern tree objc_finish_message_expr (tree, tree, tree);
900extern tree objc_build_selector_expr (tree);
901extern tree objc_build_protocol_expr (tree);
902extern tree objc_build_encode_expr (tree);
903extern tree objc_build_string_object (tree);
904extern tree objc_get_protocol_qualified_type (tree, tree);
905extern tree objc_get_class_reference (tree);
906extern tree objc_get_class_ivars (tree);
907extern void objc_start_class_interface (tree, tree, tree);
908extern void objc_start_category_interface (tree, tree, tree);
909extern void objc_start_protocol (tree, tree);
910extern void objc_continue_interface (void);
911extern void objc_finish_interface (void);
912extern void objc_start_class_implementation (tree, tree);
913extern void objc_start_category_implementation (tree, tree);
914extern void objc_continue_implementation (void);
915extern void objc_finish_implementation (void);
916extern void objc_set_visibility (int);
917extern void objc_set_method_type (enum tree_code);
918extern tree objc_build_method_signature (tree, tree, tree, bool);
919extern void objc_add_method_declaration (tree);
920extern void objc_start_method_definition (tree);
921extern void objc_finish_method_definition (tree);
922extern void objc_add_instance_variable (tree);
923extern tree objc_build_keyword_decl (tree, tree, tree);
924extern tree objc_build_throw_stmt (tree);
925extern void objc_begin_try_stmt (location_t, tree);
926extern tree objc_finish_try_stmt (void);
927extern void objc_begin_catch_clause (tree);
928extern void objc_finish_catch_clause (void);
929extern void objc_build_finally_clause (location_t, tree);
930extern tree objc_build_synchronized (location_t, tree, tree);
931extern int objc_static_init_needed_p (void);
932extern tree objc_generate_static_init_call (tree);
933extern tree objc_generate_write_barrier (tree, enum tree_code, tree);
934
935/* The following are provided by the C and C++ front-ends, and called by
936   ObjC/ObjC++.  */
937extern void *objc_get_current_scope (void);
938extern void objc_mark_locals_volatile (void *);
939
940/* In c-ppoutput.c  */
941extern void init_pp_output (FILE *);
942extern void preprocess_file (cpp_reader *);
943extern void pp_file_change (const struct line_map *);
944extern void pp_dir_change (cpp_reader *, const char *);
945extern bool check_missing_format_attribute (tree, tree);
946
947/* In c-omp.c  */
948extern tree c_finish_omp_master (tree);
949extern tree c_finish_omp_critical (tree, tree);
950extern tree c_finish_omp_ordered (tree);
951extern void c_finish_omp_barrier (void);
952extern tree c_finish_omp_atomic (enum tree_code, tree, tree);
953extern void c_finish_omp_flush (void);
954extern tree c_finish_omp_for (location_t, tree, tree, tree, tree, tree, tree);
955extern void c_split_parallel_clauses (tree, tree *, tree *);
956extern enum omp_clause_default_kind c_omp_predetermined_sharing (tree);
957
958/* Not in c-omp.c; provided by the front end.  */
959extern bool c_omp_sharing_predetermined (tree);
960extern tree c_omp_remap_decl (tree, bool);
961
962/* In order for the format checking to accept the C frontend
963   diagnostic framework extensions, you must include this file before
964   toplev.h, not after.  The C front end formats are a subset of those
965   for C++, so they are the appropriate set to use in common code;
966   cp-tree.h overrides this for C++.  */
967#ifndef GCC_DIAG_STYLE
968#define GCC_DIAG_STYLE __gcc_cdiag__
969#endif
970
971#endif /* ! GCC_C_COMMON_H */
972