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,
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
418/* C/ObjC language option variables.  */
419
420
421/* Nonzero means allow type mismatches in conditional expressions;
422   just make their values `void'.  */
423
424extern int flag_cond_mismatch;
425
426/* Nonzero means enable C89 Amendment 1 features.  */
427
428extern int flag_isoc94;
429
430/* Nonzero means use the ISO C99 dialect of C.  */
431
432extern int flag_isoc99;
433
434/* Nonzero means that we have builtin functions, and main is an int.  */
435
436extern int flag_hosted;
437
438/* Warn if main is suspicious.  */
439
440extern int warn_main;
441
442
443/* ObjC language option variables.  */
444
445
446/* Open and close the file for outputting class declarations, if
447   requested (ObjC).  */
448
449extern int flag_gen_declaration;
450
451/* Tells the compiler that this is a special run.  Do not perform any
452   compiling, instead we are to test some platform dependent features
453   and output a C header file with appropriate definitions.  */
454
455extern int print_struct_values;
456
457/* ???.  Undocumented.  */
458
459extern const char *constant_string_class_name;
460
461
462/* C++ language option variables.  */
463
464
465/* Nonzero means don't recognize any extension keywords.  */
466
467extern int flag_no_gnu_keywords;
468
469/* Nonzero means do emit exported implementations of functions even if
470   they can be inlined.  */
471
472extern int flag_implement_inlines;
473
474/* Nonzero means that implicit instantiations will be emitted if needed.  */
475
476extern int flag_implicit_templates;
477
478/* Nonzero means that implicit instantiations of inline templates will be
479   emitted if needed, even if instantiations of non-inline templates
480   aren't.  */
481
482extern int flag_implicit_inline_templates;
483
484/* Nonzero means generate separate instantiation control files and
485   juggle them at link time.  */
486
487extern int flag_use_repository;
488
489/* Nonzero if we want to issue diagnostics that the standard says are not
490   required.  */
491
492extern int flag_optional_diags;
493
494/* Nonzero means we should attempt to elide constructors when possible.  */
495
496extern int flag_elide_constructors;
497
498/* Nonzero means that member functions defined in class scope are
499   inline by default.  */
500
501extern int flag_default_inline;
502
503/* Controls whether compiler generates 'type descriptor' that give
504   run-time type information.  */
505
506extern int flag_rtti;
507
508/* Nonzero if we want to conserve space in the .o files.  We do this
509   by putting uninitialized data and runtime initialized data into
510   .common instead of .data at the expense of not flagging multiple
511   definitions.  */
512
513extern int flag_conserve_space;
514
515/* Nonzero if we want to obey access control semantics.  */
516
517extern int flag_access_control;
518
519/* Nonzero if we want to check the return value of new and avoid calling
520   constructors if it is a null pointer.  */
521
522extern int flag_check_new;
523
524/* Nonzero if we want the new ISO rules for pushing a new scope for `for'
525   initialization variables.
526   0: Old rules, set by -fno-for-scope.
527   2: New ISO rules, set by -ffor-scope.
528   1: Try to implement new ISO rules, but with backup compatibility
529   (and warnings).  This is the default, for now.  */
530
531extern int flag_new_for_scope;
532
533/* Nonzero if we want to emit defined symbols with common-like linkage as
534   weak symbols where possible, in order to conform to C++ semantics.
535   Otherwise, emit them as local symbols.  */
536
537extern int flag_weak;
538
539/* 0 means we want the preprocessor to not emit line directives for
540   the current working directory.  1 means we want it to do it.  -1
541   means we should decide depending on whether debugging information
542   is being emitted or not.  */
543
544extern int flag_working_directory;
545
546/* Nonzero to use __cxa_atexit, rather than atexit, to register
547   destructors for local statics and global objects.  */
548
549extern int flag_use_cxa_atexit;
550
551/* Nonzero to use __cxa_get_exception_ptr in the C++ exception-handling
552   logic.  */
553
554extern int flag_use_cxa_get_exception_ptr;
555
556/* Nonzero means make the default pedwarns warnings instead of errors.
557   The value of this flag is ignored if -pedantic is specified.  */
558
559extern int flag_permissive;
560
561/* Nonzero means to implement standard semantics for exception
562   specifications, calling unexpected if an exception is thrown that
563   doesn't match the specification.  Zero means to treat them as
564   assertions and optimize accordingly, but not check them.  */
565
566extern int flag_enforce_eh_specs;
567
568/* Nonzero (the default) means to generate thread-safe code for
569   initializing local statics.  */
570
571extern int flag_threadsafe_statics;
572
573/* Nonzero means warn about implicit declarations.  */
574
575extern int warn_implicit;
576
577/* Warn about using __null (as NULL in C++) as sentinel.  For code compiled
578   with GCC this doesn't matter as __null is guaranteed to have the right
579   size.  */
580
581extern int warn_strict_null_sentinel;
582
583/* Maximum template instantiation depth.  This limit is rather
584   arbitrary, but it exists to limit the time it takes to notice
585   infinite template instantiations.  */
586
587extern int max_tinst_depth;
588
589/* Nonzero means the expression being parsed will never be evaluated.
590   This is a count, since unevaluated expressions can nest.  */
591
592extern int skip_evaluation;
593
594/* C types are partitioned into three subsets: object, function, and
595   incomplete types.  */
596#define C_TYPE_OBJECT_P(type) \
597  (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
598
599#define C_TYPE_INCOMPLETE_P(type) \
600  (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
601
602#define C_TYPE_FUNCTION_P(type) \
603  (TREE_CODE (type) == FUNCTION_TYPE)
604
605/* For convenience we define a single macro to identify the class of
606   object or incomplete types.  */
607#define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
608  (!C_TYPE_FUNCTION_P (type))
609
610/* Attribute table common to the C front ends.  */
611extern const struct attribute_spec c_common_attribute_table[];
612extern const struct attribute_spec c_common_format_attribute_table[];
613
614/* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc.
615   ID is the identifier to use, NAME is the string.
616   TYPE_DEP indicates whether it depends on type of the function or not
617   (i.e. __PRETTY_FUNCTION__).  */
618
619extern tree (*make_fname_decl) (tree, int);
620
621extern tree identifier_global_value (tree);
622extern void record_builtin_type (enum rid, const char *, tree);
623extern tree build_void_list_node (void);
624extern void start_fname_decls (void);
625extern void finish_fname_decls (void);
626extern const char *fname_as_string (int);
627extern tree fname_decl (unsigned, tree);
628
629extern void check_function_arguments (tree, tree, tree);
630extern void check_function_arguments_recurse (void (*)
631					      (void *, tree,
632					       unsigned HOST_WIDE_INT),
633					      void *, tree,
634					      unsigned HOST_WIDE_INT);
635extern void check_function_format (tree, tree);
636extern void set_Wformat (int);
637extern tree handle_format_attribute (tree *, tree, tree, int, bool *);
638extern tree handle_format_arg_attribute (tree *, tree, tree, int, bool *);
639extern int c_common_handle_option (size_t code, const char *arg, int value);
640extern bool c_common_missing_argument (const char *opt, size_t code);
641extern tree c_common_type_for_mode (enum machine_mode, int);
642extern tree c_common_type_for_size (unsigned int, int);
643extern tree c_common_unsigned_type (tree);
644extern tree c_common_signed_type (tree);
645extern tree c_common_signed_or_unsigned_type (int, tree);
646extern tree c_build_bitfield_integer_type (unsigned HOST_WIDE_INT, int);
647extern tree c_common_truthvalue_conversion (tree);
648extern void c_apply_type_quals_to_decl (int, tree);
649extern tree c_sizeof_or_alignof_type (tree, bool, int);
650extern tree c_alignof_expr (tree);
651/* Print an error message for invalid operands to arith operation CODE.
652   NOP_EXPR is used as a special case (see truthvalue_conversion).  */
653extern void binary_op_error (enum tree_code);
654extern tree fix_string_type (tree);
655struct varray_head_tag;
656extern void constant_expression_warning (tree);
657extern void strict_aliasing_warning(tree, tree, tree);
658extern void empty_body_warning (tree, tree);
659extern tree convert_and_check (tree, tree);
660extern void overflow_warning (tree);
661extern bool c_determine_visibility (tree);
662extern bool same_scalar_type_ignoring_signedness (tree, tree);
663
664#define c_sizeof(T)  c_sizeof_or_alignof_type (T, true, 1)
665#define c_alignof(T) c_sizeof_or_alignof_type (T, false, 1)
666
667/* Subroutine of build_binary_op, used for comparison operations.
668   See if the operands have both been converted from subword integer types
669   and, if so, perhaps change them both back to their original type.  */
670extern tree shorten_compare (tree *, tree *, tree *, enum tree_code *);
671
672extern tree pointer_int_sum (enum tree_code, tree, tree);
673extern unsigned int min_precision (tree, int);
674
675/* Add qualifiers to a type, in the fashion for C.  */
676extern tree c_build_qualified_type (tree, int);
677
678/* Build tree nodes and builtin functions common to both C and C++ language
679   frontends.  */
680extern void c_common_nodes_and_builtins (void);
681
682extern void set_builtin_user_assembler_name (tree decl, const char *asmspec);
683
684extern void disable_builtin_function (const char *);
685
686extern void set_compound_literal_name (tree decl);
687
688extern tree build_va_arg (tree, tree);
689
690extern unsigned int c_common_init_options (unsigned int, const char **);
691extern bool c_common_post_options (const char **);
692extern bool c_common_init (void);
693extern void c_common_finish (void);
694extern void c_common_parse_file (int);
695extern HOST_WIDE_INT c_common_get_alias_set (tree);
696extern void c_register_builtin_type (tree, const char*);
697extern bool c_promoting_integer_type_p (tree);
698extern int self_promoting_args_p (tree);
699extern tree strip_array_types (tree);
700extern tree strip_pointer_operator (tree);
701extern HOST_WIDE_INT c_common_to_target_charset (HOST_WIDE_INT);
702
703/* This is the basic parsing function.  */
704extern void c_parse_file (void);
705/* This is misnamed, it actually performs end-of-compilation processing.  */
706extern void finish_file	(void);
707
708
709/* These macros provide convenient access to the various _STMT nodes.  */
710
711/* Nonzero if a given STATEMENT_LIST represents the outermost binding
712   if a statement expression.  */
713#define STATEMENT_LIST_STMT_EXPR(NODE) \
714  TREE_LANG_FLAG_1 (STATEMENT_LIST_CHECK (NODE))
715
716/* Nonzero if a label has been added to the statement list.  */
717#define STATEMENT_LIST_HAS_LABEL(NODE) \
718  TREE_LANG_FLAG_3 (STATEMENT_LIST_CHECK (NODE))
719
720/* COMPOUND_LITERAL_EXPR accessors.  */
721#define COMPOUND_LITERAL_EXPR_DECL_STMT(NODE)		\
722  TREE_OPERAND (COMPOUND_LITERAL_EXPR_CHECK (NODE), 0)
723#define COMPOUND_LITERAL_EXPR_DECL(NODE)			\
724  DECL_EXPR_DECL (COMPOUND_LITERAL_EXPR_DECL_STMT (NODE))
725
726#define DEFTREECODE(SYM, NAME, TYPE, LENGTH) SYM,
727
728enum c_tree_code {
729  C_DUMMY_TREE_CODE = LAST_AND_UNUSED_TREE_CODE,
730#include "c-common.def"
731  LAST_C_TREE_CODE
732};
733
734#undef DEFTREECODE
735
736extern int anon_aggr_type_p (tree);
737
738/* For a VAR_DECL that is an anonymous union, these are the various
739   sub-variables that make up the anonymous union.  */
740#define DECL_ANON_UNION_ELEMS(NODE) DECL_ARGUMENTS ((NODE))
741
742/* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
743#define DECL_C_BIT_FIELD(NODE) \
744  (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
745#define SET_DECL_C_BIT_FIELD(NODE) \
746  (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
747#define CLEAR_DECL_C_BIT_FIELD(NODE) \
748  (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
749
750extern void emit_local_var (tree);
751extern tree do_case (tree, tree);
752extern tree build_stmt (enum tree_code, ...);
753extern tree build_case_label (tree, tree, tree);
754
755/* These functions must be defined by each front-end which implements
756   a variant of the C language.  They are used in c-common.c.  */
757
758extern tree build_unary_op (enum tree_code, tree, int);
759extern tree build_binary_op (enum tree_code, tree, tree, int);
760extern tree perform_integral_promotions (tree);
761
762/* These functions must be defined by each front-end which implements
763   a variant of the C language.  They are used by port files.  */
764
765extern tree default_conversion (tree);
766
767/* Given two integer or real types, return the type for their sum.
768   Given two compatible ANSI C types, returns the merged type.  */
769
770extern tree common_type (tree, tree);
771
772extern tree decl_constant_value (tree);
773
774/* Handle increment and decrement of boolean types.  */
775extern tree boolean_increment (enum tree_code, tree);
776
777extern int case_compare (splay_tree_key, splay_tree_key);
778
779extern tree c_add_case_label (splay_tree, tree, tree, tree, tree);
780
781extern void c_do_switch_warnings (splay_tree, location_t, tree, tree);
782
783extern tree build_function_call (tree, tree);
784
785extern tree resolve_overloaded_builtin (tree, tree);
786
787extern tree finish_label_address_expr (tree);
788
789/* Same function prototype, but the C and C++ front ends have
790   different implementations.  Used in c-common.c.  */
791extern tree lookup_label (tree);
792extern tree lookup_name (tree);
793
794extern int vector_types_convertible_p (tree t1, tree t2);
795
796extern rtx c_expand_expr (tree, rtx, enum machine_mode, int, rtx *);
797
798extern tree c_staticp (tree);
799
800extern void init_c_lex (void);
801
802extern void c_cpp_builtins (cpp_reader *);
803
804/* Positive if an implicit `extern "C"' scope has just been entered;
805   negative if such a scope has just been exited.  */
806extern GTY(()) int pending_lang_change;
807
808/* Information recorded about each file examined during compilation.  */
809
810struct c_fileinfo
811{
812  int time;	/* Time spent in the file.  */
813
814  /* Flags used only by C++.
815     INTERFACE_ONLY nonzero means that we are in an "interface" section
816     of the compiler.  INTERFACE_UNKNOWN nonzero means we cannot trust
817     the value of INTERFACE_ONLY.  If INTERFACE_UNKNOWN is zero and
818     INTERFACE_ONLY is zero, it means that we are responsible for
819     exporting definitions that others might need.  */
820  short interface_only;
821  short interface_unknown;
822};
823
824struct c_fileinfo *get_fileinfo (const char *);
825extern void dump_time_statistics (void);
826
827extern bool c_dump_tree (void *, tree);
828
829extern void c_warn_unused_result (tree *);
830
831extern void verify_sequence_points (tree);
832
833extern tree fold_offsetof (tree, tree);
834
835/* Places where an lvalue, or modifiable lvalue, may be required.
836   Used to select diagnostic messages in lvalue_error and
837   readonly_error.  */
838enum lvalue_use {
839  lv_assign,
840  lv_increment,
841  lv_decrement,
842  lv_addressof,
843  lv_asm
844};
845
846extern void lvalue_error (enum lvalue_use);
847
848extern int complete_array_type (tree *, tree, bool);
849
850extern tree builtin_type_for_size (int, bool);
851
852extern void warn_array_subscript_with_type_char (tree);
853
854/* In c-gimplify.c  */
855extern void c_genericize (tree);
856extern int c_gimplify_expr (tree *, tree *, tree *);
857extern tree c_build_bind_expr (tree, tree);
858
859/* In c-pch.c  */
860extern void pch_init (void);
861extern int c_common_valid_pch (cpp_reader *pfile, const char *name, int fd);
862extern void c_common_read_pch (cpp_reader *pfile, const char *name, int fd,
863			       const char *orig);
864extern void c_common_write_pch (void);
865extern void c_common_no_more_pch (void);
866extern void c_common_pch_pragma (cpp_reader *pfile, const char *);
867extern void c_common_print_pch_checksum (FILE *f);
868
869/* In *-checksum.c */
870extern const unsigned char executable_checksum[16];
871
872extern void builtin_define_with_value (const char *, const char *, int);
873extern void c_stddef_cpp_builtins (void);
874extern void fe_file_change (const struct line_map *);
875extern void c_parse_error (const char *, enum cpp_ttype, tree);
876
877/* Objective-C / Objective-C++ entry points.  */
878
879/* The following ObjC/ObjC++ functions are called by the C and/or C++
880   front-ends; they all must have corresponding stubs in stub-objc.c.  */
881extern tree objc_is_class_name (tree);
882extern tree objc_is_object_ptr (tree);
883extern void objc_check_decl (tree);
884extern int objc_is_reserved_word (tree);
885extern bool objc_compare_types (tree, tree, int, tree);
886extern void objc_volatilize_decl (tree);
887extern bool objc_type_quals_match (tree, tree);
888extern tree objc_rewrite_function_call (tree, tree);
889extern tree objc_message_selector (void);
890extern tree objc_lookup_ivar (tree, tree);
891extern void objc_clear_super_receiver (void);
892extern int objc_is_public (tree, tree);
893extern tree objc_is_id (tree);
894extern void objc_declare_alias (tree, tree);
895extern void objc_declare_class (tree);
896extern void objc_declare_protocols (tree);
897extern tree objc_build_message_expr (tree);
898extern tree objc_finish_message_expr (tree, tree, tree);
899extern tree objc_build_selector_expr (tree);
900extern tree objc_build_protocol_expr (tree);
901extern tree objc_build_encode_expr (tree);
902extern tree objc_build_string_object (tree);
903extern tree objc_get_protocol_qualified_type (tree, tree);
904extern tree objc_get_class_reference (tree);
905extern tree objc_get_class_ivars (tree);
906extern void objc_start_class_interface (tree, tree, tree);
907extern void objc_start_category_interface (tree, tree, tree);
908extern void objc_start_protocol (tree, tree);
909extern void objc_continue_interface (void);
910extern void objc_finish_interface (void);
911extern void objc_start_class_implementation (tree, tree);
912extern void objc_start_category_implementation (tree, tree);
913extern void objc_continue_implementation (void);
914extern void objc_finish_implementation (void);
915extern void objc_set_visibility (int);
916extern void objc_set_method_type (enum tree_code);
917extern tree objc_build_method_signature (tree, tree, tree, bool);
918extern void objc_add_method_declaration (tree);
919extern void objc_start_method_definition (tree);
920extern void objc_finish_method_definition (tree);
921extern void objc_add_instance_variable (tree);
922extern tree objc_build_keyword_decl (tree, tree, tree);
923extern tree objc_build_throw_stmt (tree);
924extern void objc_begin_try_stmt (location_t, tree);
925extern tree objc_finish_try_stmt (void);
926extern void objc_begin_catch_clause (tree);
927extern void objc_finish_catch_clause (void);
928extern void objc_build_finally_clause (location_t, tree);
929extern tree objc_build_synchronized (location_t, tree, tree);
930extern int objc_static_init_needed_p (void);
931extern tree objc_generate_static_init_call (tree);
932extern tree objc_generate_write_barrier (tree, enum tree_code, tree);
933
934/* The following are provided by the C and C++ front-ends, and called by
935   ObjC/ObjC++.  */
936extern void *objc_get_current_scope (void);
937extern void objc_mark_locals_volatile (void *);
938
939/* In c-ppoutput.c  */
940extern void init_pp_output (FILE *);
941extern void preprocess_file (cpp_reader *);
942extern void pp_file_change (const struct line_map *);
943extern void pp_dir_change (cpp_reader *, const char *);
944extern bool check_missing_format_attribute (tree, tree);
945
946/* In c-omp.c  */
947extern tree c_finish_omp_master (tree);
948extern tree c_finish_omp_critical (tree, tree);
949extern tree c_finish_omp_ordered (tree);
950extern void c_finish_omp_barrier (void);
951extern tree c_finish_omp_atomic (enum tree_code, tree, tree);
952extern void c_finish_omp_flush (void);
953extern tree c_finish_omp_for (location_t, tree, tree, tree, tree, tree, tree);
954extern void c_split_parallel_clauses (tree, tree *, tree *);
955extern enum omp_clause_default_kind c_omp_predetermined_sharing (tree);
956
957/* Not in c-omp.c; provided by the front end.  */
958extern bool c_omp_sharing_predetermined (tree);
959extern tree c_omp_remap_decl (tree, bool);
960
961/* In order for the format checking to accept the C frontend
962   diagnostic framework extensions, you must include this file before
963   toplev.h, not after.  The C front end formats are a subset of those
964   for C++, so they are the appropriate set to use in common code;
965   cp-tree.h overrides this for C++.  */
966#ifndef GCC_DIAG_STYLE
967#define GCC_DIAG_STYLE __gcc_cdiag__
968#endif
969
970#endif /* ! GCC_C_COMMON_H */
971