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author kent <kent@cr.ie.u-ryukyu.ac.jp>
date Fri, 17 Jul 2009 14:47:48 +0900
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1 /* Definitions for c-common.c.
2 Copyright (C) 1987, 1993, 1994, 1995, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008
4 Free Software Foundation, Inc.
5
6 This file is part of GCC.
7
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
11 version.
12
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
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
46 enum 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, RID_SAT,
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 RID_FRACT, RID_ACCUM,
77
78 /* This means to warn that this is a C++ keyword, and then treat it
79 as a normal identifier. */
80 RID_CXX_COMPAT_WARN,
81
82 /* Too many ways of getting the name of a function as a string */
83 RID_FUNCTION_NAME, RID_PRETTY_FUNCTION_NAME, RID_C99_FUNCTION_NAME,
84
85 /* C++ */
86 RID_BOOL, RID_WCHAR, RID_CLASS,
87 RID_PUBLIC, RID_PRIVATE, RID_PROTECTED,
88 RID_TEMPLATE, RID_NULL, RID_CATCH,
89 RID_DELETE, RID_FALSE, RID_NAMESPACE,
90 RID_NEW, RID_OFFSETOF, RID_OPERATOR,
91 RID_THIS, RID_THROW, RID_TRUE,
92 RID_TRY, RID_TYPENAME, RID_TYPEID,
93 RID_USING, RID_CHAR16, RID_CHAR32,
94
95 /* casts */
96 RID_CONSTCAST, RID_DYNCAST, RID_REINTCAST, RID_STATCAST,
97
98 /* C++ extensions */
99 RID_HAS_NOTHROW_ASSIGN, RID_HAS_NOTHROW_CONSTRUCTOR,
100 RID_HAS_NOTHROW_COPY, RID_HAS_TRIVIAL_ASSIGN,
101 RID_HAS_TRIVIAL_CONSTRUCTOR, RID_HAS_TRIVIAL_COPY,
102 RID_HAS_TRIVIAL_DESTRUCTOR, RID_HAS_VIRTUAL_DESTRUCTOR,
103 RID_IS_ABSTRACT, RID_IS_BASE_OF,
104 RID_IS_CONVERTIBLE_TO, RID_IS_CLASS,
105 RID_IS_EMPTY, RID_IS_ENUM,
106 RID_IS_POD, RID_IS_POLYMORPHIC,
107 RID_IS_UNION,
108
109 /* C++0x */
110 RID_STATIC_ASSERT, RID_DECLTYPE,
111
112 /* Objective-C */
113 RID_AT_ENCODE, RID_AT_END,
114 RID_AT_CLASS, RID_AT_ALIAS, RID_AT_DEFS,
115 RID_AT_PRIVATE, RID_AT_PROTECTED, RID_AT_PUBLIC,
116 RID_AT_PROTOCOL, RID_AT_SELECTOR,
117 RID_AT_THROW, RID_AT_TRY, RID_AT_CATCH,
118 RID_AT_FINALLY, RID_AT_SYNCHRONIZED,
119 RID_AT_INTERFACE,
120 RID_AT_IMPLEMENTATION,
121
122 RID_MAX,
123
124 RID_FIRST_MODIFIER = RID_STATIC,
125 RID_LAST_MODIFIER = RID_ONEWAY,
126
127 RID_FIRST_CXX0X = RID_STATIC_ASSERT,
128 RID_LAST_CXX0X = RID_DECLTYPE,
129 RID_FIRST_AT = RID_AT_ENCODE,
130 RID_LAST_AT = RID_AT_IMPLEMENTATION,
131 RID_FIRST_PQ = RID_IN,
132 RID_LAST_PQ = RID_ONEWAY
133 };
134
135 #define OBJC_IS_AT_KEYWORD(rid) \
136 ((unsigned int) (rid) >= (unsigned int) RID_FIRST_AT && \
137 (unsigned int) (rid) <= (unsigned int) RID_LAST_AT)
138
139 #define OBJC_IS_PQ_KEYWORD(rid) \
140 ((unsigned int) (rid) >= (unsigned int) RID_FIRST_PQ && \
141 (unsigned int) (rid) <= (unsigned int) RID_LAST_PQ)
142
143 /* The elements of `ridpointers' are identifier nodes for the reserved
144 type names and storage classes. It is indexed by a RID_... value. */
145 extern GTY ((length ("(int) RID_MAX"))) tree *ridpointers;
146
147 /* Standard named or nameless data types of the C compiler. */
148
149 enum c_tree_index
150 {
151 CTI_CHAR16_TYPE,
152 CTI_CHAR32_TYPE,
153 CTI_WCHAR_TYPE,
154 CTI_SIGNED_WCHAR_TYPE,
155 CTI_UNSIGNED_WCHAR_TYPE,
156 CTI_WINT_TYPE,
157 CTI_SIGNED_SIZE_TYPE, /* For format checking only. */
158 CTI_UNSIGNED_PTRDIFF_TYPE, /* For format checking only. */
159 CTI_INTMAX_TYPE,
160 CTI_UINTMAX_TYPE,
161 CTI_WIDEST_INT_LIT_TYPE,
162 CTI_WIDEST_UINT_LIT_TYPE,
163
164 CTI_CHAR_ARRAY_TYPE,
165 CTI_CHAR16_ARRAY_TYPE,
166 CTI_CHAR32_ARRAY_TYPE,
167 CTI_WCHAR_ARRAY_TYPE,
168 CTI_INT_ARRAY_TYPE,
169 CTI_STRING_TYPE,
170 CTI_CONST_STRING_TYPE,
171
172 /* Type for boolean expressions (bool in C++, int in C). */
173 CTI_TRUTHVALUE_TYPE,
174 CTI_TRUTHVALUE_TRUE,
175 CTI_TRUTHVALUE_FALSE,
176
177 CTI_DEFAULT_FUNCTION_TYPE,
178
179 /* These are not types, but we have to look them up all the time. */
180 CTI_FUNCTION_NAME_DECL,
181 CTI_PRETTY_FUNCTION_NAME_DECL,
182 CTI_C99_FUNCTION_NAME_DECL,
183 CTI_SAVED_FUNCTION_NAME_DECLS,
184
185 CTI_VOID_ZERO,
186
187 CTI_NULL,
188
189 CTI_MAX
190 };
191
192 #define C_CPP_HASHNODE(id) \
193 (&(((struct c_common_identifier *) (id))->node))
194 #define C_RID_CODE(id) \
195 ((enum rid) (((struct c_common_identifier *) (id))->node.rid_code))
196 #define C_SET_RID_CODE(id, code) \
197 (((struct c_common_identifier *) (id))->node.rid_code = (unsigned char) code)
198
199 /* Identifier part common to the C front ends. Inherits from
200 tree_identifier, despite appearances. */
201 struct c_common_identifier GTY(())
202 {
203 struct tree_common common;
204 struct cpp_hashnode node;
205 };
206
207 /* An entry in the reserved keyword table. */
208
209 struct c_common_resword
210 {
211 const char *const word;
212 ENUM_BITFIELD(rid) const rid : 16;
213 const unsigned int disable : 16;
214 };
215
216 /* Disable mask. Keywords are disabled if (reswords[i].disable &
217 mask) is _true_. Thus for keywords which are present in all
218 languages the disable field is zero. */
219
220 #define D_CONLY 0x001 /* C only (not in C++). */
221 #define D_CXXONLY 0x002 /* C++ only (not in C). */
222 #define D_C99 0x004 /* In C, C99 only. */
223 #define D_CXX0X 0x008 /* In C++, C++0X only. */
224 #define D_EXT 0x010 /* GCC extension. */
225 #define D_EXT89 0x020 /* GCC extension incorporated in C99. */
226 #define D_ASM 0x040 /* Disabled by -fno-asm. */
227 #define D_OBJC 0x080 /* In Objective C and neither C nor C++. */
228 #define D_CXX_OBJC 0x100 /* In Objective C, and C++, but not C. */
229 #define D_CXXWARN 0x200 /* In C warn with -Wcxx-compat. */
230
231 /* The reserved keyword table. */
232 extern const struct c_common_resword c_common_reswords[];
233
234 /* The number of items in the reserved keyword table. */
235 extern const unsigned int num_c_common_reswords;
236
237 #define char16_type_node c_global_trees[CTI_CHAR16_TYPE]
238 #define char32_type_node c_global_trees[CTI_CHAR32_TYPE]
239 #define wchar_type_node c_global_trees[CTI_WCHAR_TYPE]
240 #define signed_wchar_type_node c_global_trees[CTI_SIGNED_WCHAR_TYPE]
241 #define unsigned_wchar_type_node c_global_trees[CTI_UNSIGNED_WCHAR_TYPE]
242 #define wint_type_node c_global_trees[CTI_WINT_TYPE]
243 #define signed_size_type_node c_global_trees[CTI_SIGNED_SIZE_TYPE]
244 #define unsigned_ptrdiff_type_node c_global_trees[CTI_UNSIGNED_PTRDIFF_TYPE]
245 #define intmax_type_node c_global_trees[CTI_INTMAX_TYPE]
246 #define uintmax_type_node c_global_trees[CTI_UINTMAX_TYPE]
247 #define widest_integer_literal_type_node c_global_trees[CTI_WIDEST_INT_LIT_TYPE]
248 #define widest_unsigned_literal_type_node c_global_trees[CTI_WIDEST_UINT_LIT_TYPE]
249
250 #define truthvalue_type_node c_global_trees[CTI_TRUTHVALUE_TYPE]
251 #define truthvalue_true_node c_global_trees[CTI_TRUTHVALUE_TRUE]
252 #define truthvalue_false_node c_global_trees[CTI_TRUTHVALUE_FALSE]
253
254 #define char_array_type_node c_global_trees[CTI_CHAR_ARRAY_TYPE]
255 #define char16_array_type_node c_global_trees[CTI_CHAR16_ARRAY_TYPE]
256 #define char32_array_type_node c_global_trees[CTI_CHAR32_ARRAY_TYPE]
257 #define wchar_array_type_node c_global_trees[CTI_WCHAR_ARRAY_TYPE]
258 #define int_array_type_node c_global_trees[CTI_INT_ARRAY_TYPE]
259 #define string_type_node c_global_trees[CTI_STRING_TYPE]
260 #define const_string_type_node c_global_trees[CTI_CONST_STRING_TYPE]
261
262 #define default_function_type c_global_trees[CTI_DEFAULT_FUNCTION_TYPE]
263
264 #define function_name_decl_node c_global_trees[CTI_FUNCTION_NAME_DECL]
265 #define pretty_function_name_decl_node c_global_trees[CTI_PRETTY_FUNCTION_NAME_DECL]
266 #define c99_function_name_decl_node c_global_trees[CTI_C99_FUNCTION_NAME_DECL]
267 #define saved_function_name_decls c_global_trees[CTI_SAVED_FUNCTION_NAME_DECLS]
268
269 /* A node for `((void) 0)'. */
270 #define void_zero_node c_global_trees[CTI_VOID_ZERO]
271
272 /* The node for C++ `__null'. */
273 #define null_node c_global_trees[CTI_NULL]
274
275 extern GTY(()) tree c_global_trees[CTI_MAX];
276
277 /* In a RECORD_TYPE, a sorted array of the fields of the type, not a
278 tree for size reasons. */
279 struct sorted_fields_type GTY(())
280 {
281 int len;
282 tree GTY((length ("%h.len"))) elts[1];
283 };
284
285 /* Mark which labels are explicitly declared.
286 These may be shadowed, and may be referenced from nested functions. */
287 #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
288
289 typedef enum c_language_kind
290 {
291 clk_c = 0, /* C90, C94 or C99 */
292 clk_objc = 1, /* clk_c with ObjC features. */
293 clk_cxx = 2, /* ANSI/ISO C++ */
294 clk_objcxx = 3 /* clk_cxx with ObjC features. */
295 }
296 c_language_kind;
297
298 /* To test for a specific language use c_language, defined by each
299 front end. For "ObjC features" or "not C++" use the macros. */
300 extern c_language_kind c_language;
301
302 #define c_dialect_cxx() (c_language & clk_cxx)
303 #define c_dialect_objc() (c_language & clk_objc)
304
305 /* Information about a statement tree. */
306
307 struct stmt_tree_s GTY(()) {
308 /* The current statement list being collected. */
309 tree x_cur_stmt_list;
310
311 /* In C++, Nonzero if we should treat statements as full
312 expressions. In particular, this variable is no-zero if at the
313 end of a statement we should destroy any temporaries created
314 during that statement. Similarly, if, at the end of a block, we
315 should destroy any local variables in this block. Normally, this
316 variable is nonzero, since those are the normal semantics of
317 C++.
318
319 However, in order to represent aggregate initialization code as
320 tree structure, we use statement-expressions. The statements
321 within the statement expression should not result in cleanups
322 being run until the entire enclosing statement is complete.
323
324 This flag has no effect in C. */
325 int stmts_are_full_exprs_p;
326 };
327
328 typedef struct stmt_tree_s *stmt_tree;
329
330 /* Global state pertinent to the current function. Some C dialects
331 extend this structure with additional fields. */
332
333 struct c_language_function GTY(()) {
334 /* While we are parsing the function, this contains information
335 about the statement-tree that we are building. */
336 struct stmt_tree_s x_stmt_tree;
337 };
338
339 /* When building a statement-tree, this is the current statement list
340 being collected. It's TREE_CHAIN is a back-pointer to the previous
341 statement list. */
342
343 #define cur_stmt_list (current_stmt_tree ()->x_cur_stmt_list)
344
345 /* Language-specific hooks. */
346
347 /* If non-NULL, this function is called after a precompile header file
348 is loaded. */
349 extern void (*lang_post_pch_load) (void);
350
351 extern void push_file_scope (void);
352 extern void pop_file_scope (void);
353 extern stmt_tree current_stmt_tree (void);
354 extern tree push_stmt_list (void);
355 extern tree pop_stmt_list (tree);
356 extern tree add_stmt (tree);
357 extern void push_cleanup (tree, tree, bool);
358 extern tree pushdecl_top_level (tree);
359 extern tree pushdecl (tree);
360 extern tree build_modify_expr (location_t, tree, enum tree_code, tree);
361 extern tree build_indirect_ref (location_t, tree, const char *);
362
363 extern int c_expand_decl (tree);
364
365 extern int field_decl_cmp (const void *, const void *);
366 extern void resort_sorted_fields (void *, void *, gt_pointer_operator,
367 void *);
368 extern bool has_c_linkage (const_tree decl);
369
370 /* Switches common to the C front ends. */
371
372 /* Nonzero if prepreprocessing only. */
373
374 extern int flag_preprocess_only;
375
376 /* Zero means that faster, ...NonNil variants of objc_msgSend...
377 calls will be used in ObjC; passing nil receivers to such calls
378 will most likely result in crashes. */
379 extern int flag_nil_receivers;
380
381 /* Nonzero means that we will allow new ObjC exception syntax (@throw,
382 @try, etc.) in source code. */
383 extern int flag_objc_exceptions;
384
385 /* Nonzero means that we generate NeXT setjmp based exceptions. */
386 extern int flag_objc_sjlj_exceptions;
387
388 /* Nonzero means that code generation will be altered to support
389 "zero-link" execution. This currently affects ObjC only, but may
390 affect other languages in the future. */
391 extern int flag_zero_link;
392
393 /* Nonzero means emit an '__OBJC, __image_info' for the current translation
394 unit. It will inform the ObjC runtime that class definition(s) herein
395 contained are to replace one(s) previously loaded. */
396 extern int flag_replace_objc_classes;
397
398 /* Nonzero means don't output line number information. */
399
400 extern char flag_no_line_commands;
401
402 /* Nonzero causes -E output not to be done, but directives such as
403 #define that have side effects are still obeyed. */
404
405 extern char flag_no_output;
406
407 /* Nonzero means dump macros in some fashion; contains the 'D', 'M',
408 'N' or 'U' of the command line switch. */
409
410 extern char flag_dump_macros;
411
412 /* Nonzero means pass #include lines through to the output. */
413
414 extern char flag_dump_includes;
415
416 /* Nonzero means process PCH files while preprocessing. */
417
418 extern bool flag_pch_preprocess;
419
420 /* The file name to which we should write a precompiled header, or
421 NULL if no header will be written in this compile. */
422
423 extern const char *pch_file;
424
425 /* Nonzero if an ISO standard was selected. It rejects macros in the
426 user's namespace. */
427
428 extern int flag_iso;
429
430 /* Nonzero if -undef was given. It suppresses target built-in macros
431 and assertions. */
432
433 extern int flag_undef;
434
435 /* Nonzero means don't recognize the non-ANSI builtin functions. */
436
437 extern int flag_no_builtin;
438
439 /* Nonzero means don't recognize the non-ANSI builtin functions.
440 -ansi sets this. */
441
442 extern int flag_no_nonansi_builtin;
443
444 /* Nonzero means give `double' the same size as `float'. */
445
446 extern int flag_short_double;
447
448 /* Nonzero means give `wchar_t' the same size as `short'. */
449
450 extern int flag_short_wchar;
451
452 /* Nonzero means allow implicit conversions between vectors with
453 differing numbers of subparts and/or differing element types. */
454 extern int flag_lax_vector_conversions;
455
456 /* Nonzero means allow Microsoft extensions without warnings or errors. */
457 extern int flag_ms_extensions;
458
459 /* Nonzero means don't recognize the keyword `asm'. */
460
461 extern int flag_no_asm;
462
463 /* Nonzero means give string constants the type `const char *', as mandated
464 by the standard. */
465
466 extern int flag_const_strings;
467
468 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
469
470 extern int flag_signed_bitfields;
471
472 /* Warn about #pragma directives that are not recognized. */
473
474 extern int warn_unknown_pragmas; /* Tri state variable. */
475
476 /* Warn about format/argument anomalies in calls to formatted I/O functions
477 (*printf, *scanf, strftime, strfmon, etc.). */
478
479 extern int warn_format;
480
481
482 /* C/ObjC language option variables. */
483
484
485 /* Nonzero means allow type mismatches in conditional expressions;
486 just make their values `void'. */
487
488 extern int flag_cond_mismatch;
489
490 /* Nonzero means enable C89 Amendment 1 features. */
491
492 extern int flag_isoc94;
493
494 /* Nonzero means use the ISO C99 dialect of C. */
495
496 extern int flag_isoc99;
497
498 /* Nonzero means that we have builtin functions, and main is an int. */
499
500 extern int flag_hosted;
501
502 /* ObjC language option variables. */
503
504
505 /* Open and close the file for outputting class declarations, if
506 requested (ObjC). */
507
508 extern int flag_gen_declaration;
509
510 /* Tells the compiler that this is a special run. Do not perform any
511 compiling, instead we are to test some platform dependent features
512 and output a C header file with appropriate definitions. */
513
514 extern int print_struct_values;
515
516 /* ???. Undocumented. */
517
518 extern const char *constant_string_class_name;
519
520
521 /* C++ language option variables. */
522
523
524 /* Nonzero means don't recognize any extension keywords. */
525
526 extern int flag_no_gnu_keywords;
527
528 /* Nonzero means do emit exported implementations of functions even if
529 they can be inlined. */
530
531 extern int flag_implement_inlines;
532
533 /* Nonzero means that implicit instantiations will be emitted if needed. */
534
535 extern int flag_implicit_templates;
536
537 /* Nonzero means that implicit instantiations of inline templates will be
538 emitted if needed, even if instantiations of non-inline templates
539 aren't. */
540
541 extern int flag_implicit_inline_templates;
542
543 /* Nonzero means generate separate instantiation control files and
544 juggle them at link time. */
545
546 extern int flag_use_repository;
547
548 /* Nonzero if we want to issue diagnostics that the standard says are not
549 required. */
550
551 extern int flag_optional_diags;
552
553 /* Nonzero means we should attempt to elide constructors when possible. */
554
555 extern int flag_elide_constructors;
556
557 /* Nonzero means that member functions defined in class scope are
558 inline by default. */
559
560 extern int flag_default_inline;
561
562 /* Controls whether compiler generates 'type descriptor' that give
563 run-time type information. */
564
565 extern int flag_rtti;
566
567 /* Nonzero if we want to conserve space in the .o files. We do this
568 by putting uninitialized data and runtime initialized data into
569 .common instead of .data at the expense of not flagging multiple
570 definitions. */
571
572 extern int flag_conserve_space;
573
574 /* Nonzero if we want to obey access control semantics. */
575
576 extern int flag_access_control;
577
578 /* Nonzero if we want to check the return value of new and avoid calling
579 constructors if it is a null pointer. */
580
581 extern int flag_check_new;
582
583 /* The supported C++ dialects. */
584
585 enum cxx_dialect {
586 /* C++98 */
587 cxx98,
588 /* Experimental features that are likely to become part of
589 C++0x. */
590 cxx0x
591 };
592
593 /* The C++ dialect being used. C++98 is the default. */
594 extern enum cxx_dialect cxx_dialect;
595
596 /* Nonzero if we want the new ISO rules for pushing a new scope for `for'
597 initialization variables.
598 0: Old rules, set by -fno-for-scope.
599 2: New ISO rules, set by -ffor-scope.
600 1: Try to implement new ISO rules, but with backup compatibility
601 (and warnings). This is the default, for now. */
602
603 extern int flag_new_for_scope;
604
605 /* Nonzero if we want to emit defined symbols with common-like linkage as
606 weak symbols where possible, in order to conform to C++ semantics.
607 Otherwise, emit them as local symbols. */
608
609 extern int flag_weak;
610
611 /* 0 means we want the preprocessor to not emit line directives for
612 the current working directory. 1 means we want it to do it. -1
613 means we should decide depending on whether debugging information
614 is being emitted or not. */
615
616 extern int flag_working_directory;
617
618 /* Nonzero to use __cxa_atexit, rather than atexit, to register
619 destructors for local statics and global objects. */
620
621 extern int flag_use_cxa_atexit;
622
623 /* Nonzero to use __cxa_get_exception_ptr in the C++ exception-handling
624 logic. */
625
626 extern int flag_use_cxa_get_exception_ptr;
627
628 /* Nonzero means to implement standard semantics for exception
629 specifications, calling unexpected if an exception is thrown that
630 doesn't match the specification. Zero means to treat them as
631 assertions and optimize accordingly, but not check them. */
632
633 extern int flag_enforce_eh_specs;
634
635 /* Nonzero (the default) means to generate thread-safe code for
636 initializing local statics. */
637
638 extern int flag_threadsafe_statics;
639
640 /* Nonzero means warn about implicit declarations. */
641
642 extern int warn_implicit;
643
644 /* Warn about using __null (as NULL in C++) as sentinel. For code compiled
645 with GCC this doesn't matter as __null is guaranteed to have the right
646 size. */
647
648 extern int warn_strict_null_sentinel;
649
650 /* Maximum template instantiation depth. This limit is rather
651 arbitrary, but it exists to limit the time it takes to notice
652 infinite template instantiations. */
653
654 extern int max_tinst_depth;
655
656 /* Nonzero means the expression being parsed will never be evaluated.
657 This is a count, since unevaluated expressions can nest. */
658
659 extern int skip_evaluation;
660
661 /* C types are partitioned into three subsets: object, function, and
662 incomplete types. */
663 #define C_TYPE_OBJECT_P(type) \
664 (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
665
666 #define C_TYPE_INCOMPLETE_P(type) \
667 (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
668
669 #define C_TYPE_FUNCTION_P(type) \
670 (TREE_CODE (type) == FUNCTION_TYPE)
671
672 /* For convenience we define a single macro to identify the class of
673 object or incomplete types. */
674 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
675 (!C_TYPE_FUNCTION_P (type))
676
677 /* Attribute table common to the C front ends. */
678 extern const struct attribute_spec c_common_attribute_table[];
679 extern const struct attribute_spec c_common_format_attribute_table[];
680
681 /* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc.
682 ID is the identifier to use, NAME is the string.
683 TYPE_DEP indicates whether it depends on type of the function or not
684 (i.e. __PRETTY_FUNCTION__). */
685
686 extern tree (*make_fname_decl) (tree, int);
687
688 extern tree identifier_global_value (tree);
689 extern void record_builtin_type (enum rid, const char *, tree);
690 extern tree build_void_list_node (void);
691 extern void start_fname_decls (void);
692 extern void finish_fname_decls (void);
693 extern const char *fname_as_string (int);
694 extern tree fname_decl (location_t, unsigned, tree);
695
696 extern void check_function_arguments (tree, int, tree *, tree);
697 extern void check_function_arguments_recurse (void (*)
698 (void *, tree,
699 unsigned HOST_WIDE_INT),
700 void *, tree,
701 unsigned HOST_WIDE_INT);
702 extern bool check_builtin_function_arguments (tree, int, tree *);
703 extern void check_function_format (tree, int, tree *);
704 extern void set_Wformat (int);
705 extern tree handle_format_attribute (tree *, tree, tree, int, bool *);
706 extern tree handle_format_arg_attribute (tree *, tree, tree, int, bool *);
707 extern int c_common_handle_option (size_t code, const char *arg, int value);
708 extern bool c_common_missing_argument (const char *opt, size_t code);
709 extern tree c_common_type_for_mode (enum machine_mode, int);
710 extern tree c_common_type_for_size (unsigned int, int);
711 extern tree c_common_fixed_point_type_for_size (unsigned int, unsigned int,
712 int, int);
713 extern tree c_common_unsigned_type (tree);
714 extern tree c_common_signed_type (tree);
715 extern tree c_common_signed_or_unsigned_type (int, tree);
716 extern tree c_build_bitfield_integer_type (unsigned HOST_WIDE_INT, int);
717 extern bool decl_with_nonnull_addr_p (const_tree);
718 extern tree c_common_truthvalue_conversion (location_t, tree);
719 extern void c_apply_type_quals_to_decl (int, tree);
720 extern tree c_sizeof_or_alignof_type (tree, bool, int);
721 extern tree c_alignof_expr (tree);
722 /* Print an error message for invalid operands to arith operation CODE.
723 NOP_EXPR is used as a special case (see truthvalue_conversion). */
724 extern void binary_op_error (location_t, enum tree_code, tree, tree);
725 extern tree fix_string_type (tree);
726 struct varray_head_tag;
727 extern void constant_expression_warning (tree);
728 extern void constant_expression_error (tree);
729 extern bool strict_aliasing_warning (tree, tree, tree);
730 extern void warnings_for_convert_and_check (tree, tree, tree);
731 extern tree convert_and_check (tree, tree);
732 extern void overflow_warning (tree);
733 extern void warn_logical_operator (enum tree_code, tree, tree);
734 extern void check_main_parameter_types (tree decl);
735 extern bool c_determine_visibility (tree);
736 extern bool same_scalar_type_ignoring_signedness (tree, tree);
737
738 #define c_sizeof(T) c_sizeof_or_alignof_type (T, true, 1)
739 #define c_alignof(T) c_sizeof_or_alignof_type (T, false, 1)
740
741 /* Subroutine of build_binary_op, used for certain operations. */
742 extern tree shorten_binary_op (tree result_type, tree op0, tree op1, bool bitwise);
743
744 /* Subroutine of build_binary_op, used for comparison operations.
745 See if the operands have both been converted from subword integer types
746 and, if so, perhaps change them both back to their original type. */
747 extern tree shorten_compare (tree *, tree *, tree *, enum tree_code *);
748
749 extern tree pointer_int_sum (enum tree_code, tree, tree);
750
751 /* Add qualifiers to a type, in the fashion for C. */
752 extern tree c_build_qualified_type (tree, int);
753
754 /* Build tree nodes and builtin functions common to both C and C++ language
755 frontends. */
756 extern void c_common_nodes_and_builtins (void);
757
758 extern void set_builtin_user_assembler_name (tree decl, const char *asmspec);
759
760 extern void disable_builtin_function (const char *);
761
762 extern void set_compound_literal_name (tree decl);
763
764 extern tree build_va_arg (tree, tree);
765
766 extern unsigned int c_common_init_options (unsigned int, const char **);
767 extern bool c_common_post_options (const char **);
768 extern bool c_common_init (void);
769 extern void c_common_finish (void);
770 extern void c_common_parse_file (int);
771 extern alias_set_type c_common_get_alias_set (tree);
772 extern void c_register_builtin_type (tree, const char*);
773 extern bool c_promoting_integer_type_p (const_tree);
774 extern int self_promoting_args_p (const_tree);
775 extern tree strip_pointer_operator (tree);
776 extern tree strip_pointer_or_array_types (tree);
777 extern HOST_WIDE_INT c_common_to_target_charset (HOST_WIDE_INT);
778
779 /* This is the basic parsing function. */
780 extern void c_parse_file (void);
781 /* This is misnamed, it actually performs end-of-compilation processing. */
782 extern void finish_file (void);
783
784
785 /* These macros provide convenient access to the various _STMT nodes. */
786
787 /* Nonzero if a given STATEMENT_LIST represents the outermost binding
788 if a statement expression. */
789 #define STATEMENT_LIST_STMT_EXPR(NODE) \
790 TREE_LANG_FLAG_1 (STATEMENT_LIST_CHECK (NODE))
791
792 /* Nonzero if a label has been added to the statement list. */
793 #define STATEMENT_LIST_HAS_LABEL(NODE) \
794 TREE_LANG_FLAG_3 (STATEMENT_LIST_CHECK (NODE))
795
796 /* COMPOUND_LITERAL_EXPR accessors. */
797 #define COMPOUND_LITERAL_EXPR_DECL_STMT(NODE) \
798 TREE_OPERAND (COMPOUND_LITERAL_EXPR_CHECK (NODE), 0)
799 #define COMPOUND_LITERAL_EXPR_DECL(NODE) \
800 DECL_EXPR_DECL (COMPOUND_LITERAL_EXPR_DECL_STMT (NODE))
801
802 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield. */
803 #define DECL_C_BIT_FIELD(NODE) \
804 (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
805 #define SET_DECL_C_BIT_FIELD(NODE) \
806 (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
807 #define CLEAR_DECL_C_BIT_FIELD(NODE) \
808 (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
809
810 extern void emit_local_var (tree);
811 extern tree do_case (tree, tree);
812 extern tree build_stmt (enum tree_code, ...);
813 extern tree build_case_label (tree, tree, tree);
814
815 /* These functions must be defined by each front-end which implements
816 a variant of the C language. They are used in c-common.c. */
817
818 extern tree build_unary_op (location_t, enum tree_code, tree, int);
819 extern tree build_binary_op (location_t, enum tree_code, tree, tree, int);
820 extern tree perform_integral_promotions (tree);
821
822 /* These functions must be defined by each front-end which implements
823 a variant of the C language. They are used by port files. */
824
825 extern tree default_conversion (tree);
826
827 /* Given two integer or real types, return the type for their sum.
828 Given two compatible ANSI C types, returns the merged type. */
829
830 extern tree common_type (tree, tree);
831
832 extern tree decl_constant_value (tree);
833
834 /* Handle increment and decrement of boolean types. */
835 extern tree boolean_increment (enum tree_code, tree);
836
837 extern int case_compare (splay_tree_key, splay_tree_key);
838
839 extern tree c_add_case_label (splay_tree, tree, tree, tree, tree);
840
841 extern void c_do_switch_warnings (splay_tree, location_t, tree, tree);
842
843 extern tree build_function_call (tree, tree);
844
845 extern tree resolve_overloaded_builtin (tree, tree);
846
847 extern tree finish_label_address_expr (tree, location_t);
848
849 /* Same function prototype, but the C and C++ front ends have
850 different implementations. Used in c-common.c. */
851 extern tree lookup_label (tree);
852 extern tree lookup_name (tree);
853
854 extern bool vector_targets_convertible_p (const_tree t1, const_tree t2);
855 extern bool vector_types_convertible_p (const_tree t1, const_tree t2, bool emit_lax_note);
856
857 extern rtx c_expand_expr (tree, rtx, enum machine_mode, int, rtx *);
858
859 extern tree c_staticp (tree);
860
861 extern void init_c_lex (void);
862
863 extern void c_cpp_builtins (cpp_reader *);
864 extern void c_cpp_builtins_optimize_pragma (cpp_reader *, tree, tree);
865
866 /* Positive if an implicit `extern "C"' scope has just been entered;
867 negative if such a scope has just been exited. */
868 extern GTY(()) int pending_lang_change;
869
870 /* Information recorded about each file examined during compilation. */
871
872 struct c_fileinfo
873 {
874 int time; /* Time spent in the file. */
875
876 /* Flags used only by C++.
877 INTERFACE_ONLY nonzero means that we are in an "interface" section
878 of the compiler. INTERFACE_UNKNOWN nonzero means we cannot trust
879 the value of INTERFACE_ONLY. If INTERFACE_UNKNOWN is zero and
880 INTERFACE_ONLY is zero, it means that we are responsible for
881 exporting definitions that others might need. */
882 short interface_only;
883 short interface_unknown;
884 };
885
886 struct c_fileinfo *get_fileinfo (const char *);
887 extern void dump_time_statistics (void);
888
889 extern bool c_dump_tree (void *, tree);
890
891 extern void c_warn_unused_result (gimple_seq);
892
893 extern void verify_sequence_points (tree);
894
895 extern tree fold_offsetof (tree, tree);
896
897 /* Places where an lvalue, or modifiable lvalue, may be required.
898 Used to select diagnostic messages in lvalue_error and
899 readonly_error. */
900 enum lvalue_use {
901 lv_assign,
902 lv_increment,
903 lv_decrement,
904 lv_addressof,
905 lv_asm
906 };
907
908 extern void lvalue_error (enum lvalue_use);
909
910 extern int complete_array_type (tree *, tree, bool);
911
912 extern tree builtin_type_for_size (int, bool);
913
914 extern void warn_array_subscript_with_type_char (tree);
915 extern void warn_about_parentheses (enum tree_code,
916 enum tree_code, tree,
917 enum tree_code, tree);
918 extern void warn_for_unused_label (tree label);
919 extern void warn_for_div_by_zero (location_t, tree divisor);
920 extern void warn_for_sign_compare (location_t,
921 tree orig_op0, tree orig_op1,
922 tree op0, tree op1,
923 tree result_type,
924 enum tree_code resultcode);
925
926 /* In c-gimplify.c */
927 extern void c_genericize (tree);
928 extern int c_gimplify_expr (tree *, gimple_seq *, gimple_seq *);
929 extern tree c_build_bind_expr (tree, tree);
930
931 /* In c-pch.c */
932 extern void pch_init (void);
933 extern int c_common_valid_pch (cpp_reader *pfile, const char *name, int fd);
934 extern void c_common_read_pch (cpp_reader *pfile, const char *name, int fd,
935 const char *orig);
936 extern void c_common_write_pch (void);
937 extern void c_common_no_more_pch (void);
938 extern void c_common_pch_pragma (cpp_reader *pfile, const char *);
939 extern void c_common_print_pch_checksum (FILE *f);
940
941 /* In *-checksum.c */
942 extern const unsigned char executable_checksum[16];
943
944 /* In c-cppbuiltin.c */
945 extern void builtin_define_std (const char *macro);
946 extern void builtin_define_with_value (const char *, const char *, int);
947 extern void c_stddef_cpp_builtins (void);
948 extern void fe_file_change (const struct line_map *);
949 extern void c_parse_error (const char *, enum cpp_ttype, tree);
950
951 /* Objective-C / Objective-C++ entry points. */
952
953 /* The following ObjC/ObjC++ functions are called by the C and/or C++
954 front-ends; they all must have corresponding stubs in stub-objc.c. */
955 extern tree objc_is_class_name (tree);
956 extern tree objc_is_object_ptr (tree);
957 extern void objc_check_decl (tree);
958 extern int objc_is_reserved_word (tree);
959 extern bool objc_compare_types (tree, tree, int, tree);
960 extern void objc_volatilize_decl (tree);
961 extern bool objc_type_quals_match (tree, tree);
962 extern tree objc_rewrite_function_call (tree, tree);
963 extern tree objc_message_selector (void);
964 extern tree objc_lookup_ivar (tree, tree);
965 extern void objc_clear_super_receiver (void);
966 extern int objc_is_public (tree, tree);
967 extern tree objc_is_id (tree);
968 extern void objc_declare_alias (tree, tree);
969 extern void objc_declare_class (tree);
970 extern void objc_declare_protocols (tree);
971 extern tree objc_build_message_expr (tree);
972 extern tree objc_finish_message_expr (tree, tree, tree);
973 extern tree objc_build_selector_expr (tree);
974 extern tree objc_build_protocol_expr (tree);
975 extern tree objc_build_encode_expr (tree);
976 extern tree objc_build_string_object (tree);
977 extern tree objc_get_protocol_qualified_type (tree, tree);
978 extern tree objc_get_class_reference (tree);
979 extern tree objc_get_class_ivars (tree);
980 extern void objc_start_class_interface (tree, tree, tree);
981 extern void objc_start_category_interface (tree, tree, tree);
982 extern void objc_start_protocol (tree, tree);
983 extern void objc_continue_interface (void);
984 extern void objc_finish_interface (void);
985 extern void objc_start_class_implementation (tree, tree);
986 extern void objc_start_category_implementation (tree, tree);
987 extern void objc_continue_implementation (void);
988 extern void objc_finish_implementation (void);
989 extern void objc_set_visibility (int);
990 extern void objc_set_method_type (enum tree_code);
991 extern tree objc_build_method_signature (tree, tree, tree, bool);
992 extern void objc_add_method_declaration (tree);
993 extern void objc_start_method_definition (tree);
994 extern void objc_finish_method_definition (tree);
995 extern void objc_add_instance_variable (tree);
996 extern tree objc_build_keyword_decl (tree, tree, tree);
997 extern tree objc_build_throw_stmt (tree);
998 extern void objc_begin_try_stmt (location_t, tree);
999 extern tree objc_finish_try_stmt (void);
1000 extern void objc_begin_catch_clause (tree);
1001 extern void objc_finish_catch_clause (void);
1002 extern void objc_build_finally_clause (location_t, tree);
1003 extern tree objc_build_synchronized (location_t, tree, tree);
1004 extern int objc_static_init_needed_p (void);
1005 extern tree objc_generate_static_init_call (tree);
1006 extern tree objc_generate_write_barrier (tree, enum tree_code, tree);
1007
1008 /* The following are provided by the C and C++ front-ends, and called by
1009 ObjC/ObjC++. */
1010 extern void *objc_get_current_scope (void);
1011 extern void objc_mark_locals_volatile (void *);
1012
1013 /* In c-ppoutput.c */
1014 extern void init_pp_output (FILE *);
1015 extern void preprocess_file (cpp_reader *);
1016 extern void pp_file_change (const struct line_map *);
1017 extern void pp_dir_change (cpp_reader *, const char *);
1018 extern bool check_missing_format_attribute (tree, tree);
1019
1020 /* In c-omp.c */
1021 extern tree c_finish_omp_master (tree);
1022 extern tree c_finish_omp_critical (tree, tree);
1023 extern tree c_finish_omp_ordered (tree);
1024 extern void c_finish_omp_barrier (void);
1025 extern tree c_finish_omp_atomic (enum tree_code, tree, tree);
1026 extern void c_finish_omp_flush (void);
1027 extern void c_finish_omp_taskwait (void);
1028 extern tree c_finish_omp_for (location_t, tree, tree, tree, tree, tree, tree);
1029 extern void c_split_parallel_clauses (tree, tree *, tree *);
1030 extern enum omp_clause_default_kind c_omp_predetermined_sharing (tree);
1031
1032 /* Not in c-omp.c; provided by the front end. */
1033 extern bool c_omp_sharing_predetermined (tree);
1034 extern tree c_omp_remap_decl (tree, bool);
1035
1036 /* In order for the format checking to accept the C frontend
1037 diagnostic framework extensions, you must include this file before
1038 toplev.h, not after. The C front end formats are a subset of those
1039 for C++, so they are the appropriate set to use in common code;
1040 cp-tree.h overrides this for C++. */
1041 #ifndef GCC_DIAG_STYLE
1042 #define GCC_DIAG_STYLE __gcc_cdiag__
1043 #endif
1044
1045 #endif /* ! GCC_C_COMMON_H */