1	/* Definitions for CPP library.
2	Copyright (C) 1995-2025 Free Software Foundation, Inc.
3	Written by Per Bothner, 1994-95.
4
5	This program is free software; you can redistribute it and/or modify it
6	under the terms of the GNU General Public License as published by the
7	Free Software Foundation; either version 3, or (at your option) any
8	later version.
9
10	This program is distributed in the hope that it will be useful,
11	but WITHOUT ANY WARRANTY; without even the implied warranty of
12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13	GNU General Public License for more details.
14
15	You should have received a copy of the GNU General Public License
16	along with this program; see the file COPYING3. If not see
17	<http://www.gnu.org/licenses/>.
18
19	In other words, you are welcome to use, share and improve this program.
20	You are forbidden to forbid anyone else to use, share and improve
21	what you give them. Help stamp out software-hoarding! */
22	#ifndef LIBCPP_CPPLIB_H
23	#define LIBCPP_CPPLIB_H
24
25	#include <sys/types.h>
26	#include "symtab.h"
27	#include "line-map.h"
28
29	typedef struct cpp_reader cpp_reader;
30	typedef struct cpp_buffer cpp_buffer;
31	typedef struct cpp_options cpp_options;
32	typedef struct cpp_token cpp_token;
33	typedef struct cpp_string cpp_string;
34	typedef struct cpp_hashnode cpp_hashnode;
35	typedef struct cpp_macro cpp_macro;
36	typedef struct cpp_callbacks cpp_callbacks;
37	typedef struct cpp_dir cpp_dir;
38
39	struct _cpp_file;
40
41	class rich_location;
42
43	/* The first three groups, apart from '=', can appear in preprocessor
44	expressions (+= and -= are used to indicate unary + and - resp.).
45	This allows a lookup table to be implemented in _cpp_parse_expr.
46
47	The first group, to CPP_LAST_EQ, can be immediately followed by an
48	'='. The lexer needs operators ending in '=', like ">>=", to be in
49	the same order as their counterparts without the '=', like ">>".
50
51	See the cpp_operator table optab in expr.cc if you change the order or
52	add or remove anything in the first group. */
53
54	#define TTYPE_TABLE \
55	OP(EQ, "=") \
56	OP(NOT, "!") \
57	OP(GREATER, ">") /* compare */ \
58	OP(LESS, "<") \
59	OP(PLUS, "+") /* math */ \
60	OP(MINUS, "-") \
61	OP(MULT, "*") \
62	OP(DIV, "/") \
63	OP(MOD, "%") \
64	OP(AND, "&") /* bit ops */ \
65	OP(OR, "|") \
66	OP(XOR, "^") \
67	OP(RSHIFT, ">>") \
68	OP(LSHIFT, "<<") \
69	\
70	OP(COMPL, "~") \
71	OP(AND_AND, "&&") /* logical */ \
72	OP(OR_OR, "||") \
73	OP(QUERY, "?") \
74	OP(COLON, ":") \
75	OP(COMMA, ",") /* grouping */ \
76	OP(OPEN_PAREN, "(") \
77	OP(CLOSE_PAREN, ")") \
78	TK(EOF, NONE) \
79	OP(EQ_EQ, "==") /* compare */ \
80	OP(NOT_EQ, "!=") \
81	OP(GREATER_EQ, ">=") \
82	OP(LESS_EQ, "<=") \
83	OP(SPACESHIP, "<=>") \
84	\
85	/* These two are unary + / - in preprocessor expressions. */ \
86	OP(PLUS_EQ, "+=") /* math */ \
87	OP(MINUS_EQ, "-=") \
88	\
89	OP(MULT_EQ, "*=") \
90	OP(DIV_EQ, "/=") \
91	OP(MOD_EQ, "%=") \
92	OP(AND_EQ, "&=") /* bit ops */ \
93	OP(OR_EQ, "|=") \
94	OP(XOR_EQ, "^=") \
95	OP(RSHIFT_EQ, ">>=") \
96	OP(LSHIFT_EQ, "<<=") \
97	/* Digraphs together, beginning with CPP_FIRST_DIGRAPH. */ \
98	OP(HASH, "#") /* digraphs */ \
99	OP(PASTE, "##") \
100	OP(OPEN_SQUARE, "[") \
101	OP(CLOSE_SQUARE, "]") \
102	OP(OPEN_BRACE, "{") \
103	OP(CLOSE_BRACE, "}") \
104	/* The remainder of the punctuation. Order is not significant. */ \
105	OP(SEMICOLON, ";") /* structure */ \
106	OP(ELLIPSIS, "...") \
107	OP(PLUS_PLUS, "++") /* increment */ \
108	OP(MINUS_MINUS, "--") \
109	OP(DEREF, "->") /* accessors */ \
110	OP(DOT, ".") \
111	OP(SCOPE, "::") \
112	OP(DEREF_STAR, "->*") \
113	OP(DOT_STAR, ".*") \
114	OP(ATSIGN, "@") /* used in Objective-C */ \
115	\
116	TK(NAME, IDENT) /* word */ \
117	TK(AT_NAME, IDENT) /* @word - Objective-C */ \
118	TK(NUMBER, LITERAL) /* 34_be+ta */ \
119	\
120	TK(CHAR, LITERAL) /* 'char' */ \
121	TK(WCHAR, LITERAL) /* L'char' */ \
122	TK(CHAR16, LITERAL) /* u'char' */ \
123	TK(CHAR32, LITERAL) /* U'char' */ \
124	TK(UTF8CHAR, LITERAL) /* u8'char' */ \
125	TK(OTHER, LITERAL) /* stray punctuation */ \
126	\
127	TK(STRING, LITERAL) /* "string" */ \
128	TK(WSTRING, LITERAL) /* L"string" */ \
129	TK(STRING16, LITERAL) /* u"string" */ \
130	TK(STRING32, LITERAL) /* U"string" */ \
131	TK(UTF8STRING, LITERAL) /* u8"string" */ \
132	TK(OBJC_STRING, LITERAL) /* @"string" - Objective-C */ \
133	TK(HEADER_NAME, LITERAL) /* <stdio.h> in #include */ \
134	TK(UNEVAL_STRING, LITERAL) /* unevaluated "string" - C++26 */ \
135	\
136	TK(CHAR_USERDEF, LITERAL) /* 'char'_suffix - C++11 */ \
137	TK(WCHAR_USERDEF, LITERAL) /* L'char'_suffix - C++11 */ \
138	TK(CHAR16_USERDEF, LITERAL) /* u'char'_suffix - C++11 */ \
139	TK(CHAR32_USERDEF, LITERAL) /* U'char'_suffix - C++11 */ \
140	TK(UTF8CHAR_USERDEF, LITERAL) /* u8'char'_suffix - C++11 */ \
141	TK(STRING_USERDEF, LITERAL) /* "string"_suffix - C++11 */ \
142	TK(WSTRING_USERDEF, LITERAL) /* L"string"_suffix - C++11 */ \
143	TK(STRING16_USERDEF, LITERAL) /* u"string"_suffix - C++11 */ \
144	TK(STRING32_USERDEF, LITERAL) /* U"string"_suffix - C++11 */ \
145	TK(UTF8STRING_USERDEF,LITERAL) /* u8"string"_suffix - C++11 */ \
146	\
147	TK(EMBED, LITERAL) /* #embed - C23 */ \
148	\
149	TK(COMMENT, LITERAL) /* Only if output comments. */ \
150	/* SPELL_LITERAL happens to DTRT. */ \
151	TK(MACRO_ARG, NONE) /* Macro argument. */ \
152	TK(PRAGMA, NONE) /* Only for deferred pragmas. */ \
153	TK(PRAGMA_EOL, NONE) /* End-of-line for deferred pragmas. */ \
154	TK(PADDING, NONE) /* Whitespace for -E. */
155
156	#define OP(e, s) CPP_ ## e,
157	#define TK(e, s) CPP_ ## e,
158	enum cpp_ttype
159	{
160	TTYPE_TABLE
161	N_TTYPES,
162
163	/* A token type for keywords, as opposed to ordinary identifiers. */
164	CPP_KEYWORD,
165
166	/* Positions in the table. */
167	CPP_LAST_EQ = CPP_LSHIFT,
168	CPP_FIRST_DIGRAPH = CPP_HASH,
169	CPP_LAST_PUNCTUATOR= CPP_ATSIGN,
170	CPP_LAST_CPP_OP = CPP_LESS_EQ
171	};
172	#undef OP
173	#undef TK
174
175	/* C language kind, used when calling cpp_create_reader. */
176	enum c_lang {CLK_GNUC89 = 0, CLK_GNUC99, CLK_GNUC11, CLK_GNUC17, CLK_GNUC23,
177	CLK_GNUC2Y,
178	CLK_STDC89, CLK_STDC94, CLK_STDC99, CLK_STDC11, CLK_STDC17,
179	CLK_STDC23, CLK_STDC2Y,
180	CLK_GNUCXX, CLK_CXX98, CLK_GNUCXX11, CLK_CXX11,
181	CLK_GNUCXX14, CLK_CXX14, CLK_GNUCXX17, CLK_CXX17,
182	CLK_GNUCXX20, CLK_CXX20, CLK_GNUCXX23, CLK_CXX23,
183	CLK_GNUCXX26, CLK_CXX26, CLK_ASM};
184
185	/* Payload of a NUMBER, STRING, CHAR or COMMENT token. */
186	struct GTY(()) cpp_string {
187	unsigned int len;
188
189	/* TEXT is always null terminated (terminator not included in len); but this
190	GTY markup arranges that PCH streaming works properly even if there is a
191	null byte in the middle of the string. */
192	const unsigned char * GTY((string_length ("1 + %h.len"))) text;
193	};
194
195	/* Flags for the cpp_token structure. */
196	#define PREV_WHITE (1 << 0) /* If whitespace before this token. */
197	#define DIGRAPH (1 << 1) /* If it was a digraph. */
198	#define STRINGIFY_ARG (1 << 2) /* If macro argument to be stringified. */
199	#define PASTE_LEFT (1 << 3) /* If on LHS of a ## operator. */
200	#define NAMED_OP (1 << 4) /* C++ named operators. */
201	#define PREV_FALLTHROUGH (1 << 5) /* On a token preceeded by FALLTHROUGH
202	comment. */
203	#define DECIMAL_INT (1 << 6) /* Decimal integer, set in c-lex.cc. */
204	#define PURE_ZERO (1 << 7) /* Single 0 digit, used by the C++ frontend,
205	set in c-lex.cc. */
206	#define COLON_SCOPE PURE_ZERO /* Adjacent colons in C < 23. */
207	#define NO_DOT_COLON PURE_ZERO /* Set on CPP_NAME tokens whose expansion
208	shouldn't start with CPP_DOT or CPP_COLON
209	after optional CPP_PADDING. */
210	#define SP_DIGRAPH (1 << 8) /* # or ## token was a digraph. */
211	#define SP_PREV_WHITE (1 << 9) /* If whitespace before a ##
212	operator, or before this token
213	after a # operator. */
214	#define NO_EXPAND (1 << 10) /* Do not macro-expand this token. */
215	#define PRAGMA_OP (1 << 11) /* _Pragma token. */
216	#define BOL (1 << 12) /* Token at beginning of line. */
217
218	/* Specify which field, if any, of the cpp_token union is used. */
219
220	enum cpp_token_fld_kind {
221	CPP_TOKEN_FLD_NODE,
222	CPP_TOKEN_FLD_SOURCE,
223	CPP_TOKEN_FLD_STR,
224	CPP_TOKEN_FLD_ARG_NO,
225	CPP_TOKEN_FLD_TOKEN_NO,
226	CPP_TOKEN_FLD_PRAGMA,
227	CPP_TOKEN_FLD_NONE
228	};
229
230	/* A macro argument in the cpp_token union. */
231	struct GTY(()) cpp_macro_arg {
232	/* Argument number. */
233	unsigned int arg_no;
234	/* The original spelling of the macro argument token. */
235	cpp_hashnode *
236	GTY ((nested_ptr (union tree_node,
237	"%h ? CPP_HASHNODE (GCC_IDENT_TO_HT_IDENT (%h)) : NULL",
238	"%h ? HT_IDENT_TO_GCC_IDENT (HT_NODE (%h)) : NULL")))
239	spelling;
240	};
241
242	/* An identifier in the cpp_token union. */
243	struct GTY(()) cpp_identifier {
244	/* The canonical (UTF-8) spelling of the identifier. */
245	cpp_hashnode *
246	GTY ((nested_ptr (union tree_node,
247	"%h ? CPP_HASHNODE (GCC_IDENT_TO_HT_IDENT (%h)) : NULL",
248	"%h ? HT_IDENT_TO_GCC_IDENT (HT_NODE (%h)) : NULL")))
249	node;
250	/* The original spelling of the identifier. */
251	cpp_hashnode *
252	GTY ((nested_ptr (union tree_node,
253	"%h ? CPP_HASHNODE (GCC_IDENT_TO_HT_IDENT (%h)) : NULL",
254	"%h ? HT_IDENT_TO_GCC_IDENT (HT_NODE (%h)) : NULL")))
255	spelling;
256	};
257
258	/* A preprocessing token. This occupies 32 bytes on a 64-bit host. On a
259	32-bit host it occupies 20 or 24 bytes, depending whether a uint64_t
260	requires 4- or 8-byte alignment. */
261
262	struct GTY(()) cpp_token {
263
264	/* Location of first char of token, together with range of full token. */
265	location_t src_loc;
266
267	ENUM_BITFIELD(cpp_ttype) type : CHAR_BIT; /* token type */
268	unsigned short flags; /* flags - see above */
269
270	union cpp_token_u
271	{
272	/* An identifier. */
273	struct cpp_identifier GTY ((tag ("CPP_TOKEN_FLD_NODE"))) node;
274
275	/* Inherit padding from this token. */
276	cpp_token * GTY ((tag ("CPP_TOKEN_FLD_SOURCE"))) source;
277
278	/* A string, or number. */
279	struct cpp_string GTY ((tag ("CPP_TOKEN_FLD_STR"))) str;
280
281	/* Argument no. (and original spelling) for a CPP_MACRO_ARG. */
282	struct cpp_macro_arg GTY ((tag ("CPP_TOKEN_FLD_ARG_NO"))) macro_arg;
283
284	/* Original token no. for a CPP_PASTE (from a sequence of
285	consecutive paste tokens in a macro expansion). */
286	unsigned int GTY ((tag ("CPP_TOKEN_FLD_TOKEN_NO"))) token_no;
287
288	/* Caller-supplied identifier for a CPP_PRAGMA. */
289	unsigned int GTY ((tag ("CPP_TOKEN_FLD_PRAGMA"))) pragma;
290	} GTY ((desc ("cpp_token_val_index (&%1)"))) val;
291	};
292
293	/* Say which field is in use. */
294	extern enum cpp_token_fld_kind cpp_token_val_index (const cpp_token *tok);
295
296	/* A type wide enough to hold any multibyte source character.
297	cpplib's character constant interpreter requires an unsigned type.
298	Also, a typedef for the signed equivalent.
299	The width of this type is capped at 32 bits; there do exist targets
300	where wchar_t is 64 bits, but only in a non-default mode, and there
301	would be no meaningful interpretation for a wchar_t value greater
302	than 2^32 anyway -- the widest wide-character encoding around is
303	ISO 10646, which stops at 2^31. */
304	#if CHAR_BIT * SIZEOF_INT >= 32
305	# define CPPCHAR_SIGNED_T int
306	#elif CHAR_BIT * SIZEOF_LONG >= 32
307	# define CPPCHAR_SIGNED_T long
308	#else
309	# error "Cannot find a least-32-bit signed integer type"
310	#endif
311	typedef unsigned CPPCHAR_SIGNED_T cppchar_t;
312	typedef CPPCHAR_SIGNED_T cppchar_signed_t;
313
314	/* Style of header dependencies to generate. */
315	enum cpp_deps_style { DEPS_NONE = 0, DEPS_USER, DEPS_SYSTEM };
316
317	/* Structured format of module dependencies to generate. */
318	enum cpp_fdeps_format { FDEPS_FMT_NONE = 0, FDEPS_FMT_P1689R5 };
319
320	/* The possible normalization levels, from most restrictive to least. */
321	enum cpp_normalize_level {
322	/* In NFKC. */
323	normalized_KC = 0,
324	/* In NFC. */
325	normalized_C,
326	/* In NFC, except for subsequences where being in NFC would make
327	the identifier invalid. */
328	normalized_identifier_C,
329	/* Not normalized at all. */
330	normalized_none
331	};
332
333	enum cpp_main_search
334	{
335	CMS_none, /* A regular source file. */
336	CMS_header, /* Is a directly-specified header file (eg PCH or
337	header-unit). */
338	CMS_user, /* Search the user INCLUDE path. */
339	CMS_system, /* Search the system INCLUDE path. */
340	};
341
342	/* The possible bidirectional control characters checking levels. */
343	enum cpp_bidirectional_level {
344	/* No checking. */
345	bidirectional_none = 0,
346	/* Only detect unpaired uses of bidirectional control characters. */
347	bidirectional_unpaired = 1,
348	/* Detect any use of bidirectional control characters. */
349	bidirectional_any = 2,
350	/* Also warn about UCNs. */
351	bidirectional_ucn = 4
352	};
353
354	/* This structure is nested inside struct cpp_reader, and
355	carries all the options visible to the command line. */
356	struct cpp_options
357	{
358	/* The language we're preprocessing. */
359	enum c_lang lang;
360
361	/* Nonzero means use extra default include directories for C++. */
362	unsigned char cplusplus;
363
364	/* Nonzero means handle cplusplus style comments. */
365	unsigned char cplusplus_comments;
366
367	/* Nonzero means define __OBJC__, treat @ as a special token, use
368	the OBJC[PLUS]_INCLUDE_PATH environment variable, and allow
369	"#import". */
370	unsigned char objc;
371
372	/* Nonzero means don't copy comments into the output file. */
373	unsigned char discard_comments;
374
375	/* Nonzero means don't copy comments into the output file during
376	macro expansion. */
377	unsigned char discard_comments_in_macro_exp;
378
379	/* Nonzero means process the ISO trigraph sequences. */
380	unsigned char trigraphs;
381
382	/* Nonzero means process the ISO digraph sequences. */
383	unsigned char digraphs;
384
385	/* Nonzero means to allow hexadecimal floats and LL suffixes. */
386	unsigned char extended_numbers;
387
388	/* Nonzero means process u/U prefix literals (UTF-16/32). */
389	unsigned char uliterals;
390
391	/* Nonzero means process u8 prefixed character literals (UTF-8). */
392	unsigned char utf8_char_literals;
393
394	/* Nonzero means process r/R raw strings. If this is set, uliterals
395	must be set as well. */
396	unsigned char rliterals;
397
398	/* Nonzero means print names of header files (-H). */
399	unsigned char print_include_names;
400
401	/* Nonzero means complain about deprecated features. */
402	unsigned char cpp_warn_deprecated;
403
404	/* Nonzero means warn if slash-star appears in a comment. */
405	unsigned char warn_comments;
406
407	/* Nonzero means to warn about __DATA__, __TIME__ and __TIMESTAMP__ usage. */
408	unsigned char warn_date_time;
409
410	/* Nonzero means warn if a user-supplied include directory does not
411	exist. */
412	unsigned char warn_missing_include_dirs;
413
414	/* Nonzero means warn if there are any trigraphs. */
415	unsigned char warn_trigraphs;
416
417	/* Nonzero means warn about multicharacter charconsts. */
418	unsigned char warn_multichar;
419
420	/* Nonzero means warn about various incompatibilities with
421	traditional C. */
422	unsigned char cpp_warn_traditional;
423
424	/* Nonzero means warn about long long numeric constants. */
425	unsigned char cpp_warn_long_long;
426
427	/* Nonzero means warn about text after an #endif (or #else). */
428	unsigned char warn_endif_labels;
429
430	/* Nonzero means warn about implicit sign changes owing to integer
431	promotions. */
432	unsigned char warn_num_sign_change;
433
434	/* Zero means don't warn about __VA_ARGS__ usage in c89 pedantic mode.
435	Presumably the usage is protected by the appropriate #ifdef. */
436	unsigned char warn_variadic_macros;
437
438	/* Nonzero means warn about builtin macros that are redefined or
439	explicitly undefined. */
440	unsigned char warn_builtin_macro_redefined;
441
442	/* Different -Wimplicit-fallthrough= levels. */
443	unsigned char cpp_warn_implicit_fallthrough;
444
445	/* Nonzero means warn about a define of a different macro right after
446	#ifndef/#if !defined header guard directive. */
447	unsigned char warn_header_guard;
448
449	/* Nonzero means we should look for header.gcc files that remap file
450	names. */
451	unsigned char remap;
452
453	/* Zero means dollar signs are punctuation. */
454	unsigned char dollars_in_ident;
455
456	/* Nonzero means UCNs are accepted in identifiers. */
457	unsigned char extended_identifiers;
458
459	/* True if we should warn about dollars in identifiers or numbers
460	for this translation unit. */
461	unsigned char warn_dollars;
462
463	/* Nonzero means warn if undefined identifiers are evaluated in an #if. */
464	unsigned char warn_undef;
465
466	/* Nonzero means warn if "defined" is encountered in a place other than
467	an #if. */
468	unsigned char warn_expansion_to_defined;
469
470	/* Nonzero means warn of unused macros from the main file. */
471	unsigned char warn_unused_macros;
472
473	/* Nonzero for the 1999 C Standard, including corrigenda and amendments. */
474	unsigned char c99;
475
476	/* Nonzero if we are conforming to a specific C or C++ standard. */
477	unsigned char std;
478
479	/* Nonzero means give all the error messages the ANSI standard requires. */
480	unsigned char cpp_pedantic;
481
482	/* Nonzero means we're looking at already preprocessed code, so don't
483	bother trying to do macro expansion and whatnot. */
484	unsigned char preprocessed;
485
486	/* Nonzero means we are going to emit debugging logs during
487	preprocessing. */
488	unsigned char debug;
489
490	/* Nonzero means we are tracking locations of tokens involved in
491	macro expansion. 1 Means we track the location in degraded mode
492	where we do not track locations of tokens resulting from the
493	expansion of arguments of function-like macro. 2 Means we do
494	track all macro expansions. This last option is the one that
495	consumes the highest amount of memory. */
496	unsigned char track_macro_expansion;
497
498	/* Nonzero means handle C++ alternate operator names. */
499	unsigned char operator_names;
500
501	/* Nonzero means warn about use of C++ alternate operator names. */
502	unsigned char warn_cxx_operator_names;
503
504	/* True for traditional preprocessing. */
505	unsigned char traditional;
506
507	/* Nonzero for C++ 2011 Standard user-defined literals. */
508	unsigned char user_literals;
509
510	/* Nonzero means warn when a string or character literal is followed by a
511	ud-suffix which does not beging with an underscore. */
512	unsigned char warn_literal_suffix;
513
514	/* Nonzero means interpret imaginary, fixed-point, or other gnu extension
515	literal number suffixes as user-defined literal number suffixes. */
516	unsigned char ext_numeric_literals;
517
518	/* Nonzero means extended identifiers allow the characters specified
519	in C11. */
520	unsigned char c11_identifiers;
521
522	/* Nonzero means extended identifiers allow the characters specified
523	by Unicode XID_Start and XID_Continue properties. */
524	unsigned char xid_identifiers;
525
526	/* Nonzero for C++ 2014 Standard binary constants. */
527	unsigned char binary_constants;
528
529	/* Nonzero for C2Y imaginary (floating) constants. */
530	unsigned char imaginary_constants;
531
532	/* Nonzero for C++ 2014 Standard digit separators. */
533	unsigned char digit_separators;
534
535	/* Nonzero for C23 decimal floating-point constants. */
536	unsigned char dfp_constants;
537
538	/* Nonzero for C++20 __VA_OPT__ feature. */
539	unsigned char va_opt;
540
541	/* Nonzero for the '::' token. */
542	unsigned char scope;
543
544	/* Nonzero for the '#elifdef' and '#elifndef' directives. */
545	unsigned char elifdef;
546
547	/* Nonzero for the '#warning' directive. */
548	unsigned char warning_directive;
549
550	/* Nonzero means tokenize C++20 module directives. */
551	unsigned char module_directives;
552
553	/* Nonzero for C++23 size_t literals. */
554	unsigned char size_t_literals;
555
556	/* Nonzero for C++23 delimited escape sequences. */
557	unsigned char delimited_escape_seqs;
558
559	/* Nonzero for C++23 named universal character escape sequences. */
560	unsigned char named_uc_escape_seqs;
561
562	/* Nonzero for C++ and C23 UCNs for characters below 0xa0. */
563	unsigned char low_ucns;
564
565	/* Nonzero for C2Y 0o prefixed octal integer constants. */
566	unsigned char octal_constants;
567
568	/* Nonzero for 'true' and 'false' in #if expressions. */
569	unsigned char true_false;
570
571	/* Nonzero for the '#embed' directive. */
572	unsigned char embed;
573
574	/* Holds the name of the target (execution) character set. */
575	const char *narrow_charset;
576
577	/* Holds the name of the target wide character set. */
578	const char *wide_charset;
579
580	/* Holds the name of the input character set. */
581	const char *input_charset;
582
583	/* The minimum permitted level of normalization before a warning
584	is generated. See enum cpp_normalize_level. */
585	int warn_normalize;
586
587	/* True to warn about precompiled header files we couldn't use. */
588	bool warn_invalid_pch;
589
590	/* True if dependencies should be restored from a precompiled header. */
591	bool restore_pch_deps;
592
593	/* True if warn about differences between C90 and C99. */
594	signed char cpp_warn_c90_c99_compat;
595
596	/* True if warn about differences between C11 and C23. */
597	signed char cpp_warn_c11_c23_compat;
598
599	/* True if warn about differences between C23 and C2Y. */
600	signed char cpp_warn_c23_c2y_compat;
601
602	/* True if warn about differences between C++98 and C++11. */
603	bool cpp_warn_cxx11_compat;
604
605	/* True if warn about differences between C++17 and C++20. */
606	bool cpp_warn_cxx20_compat;
607
608	/* Nonzero if bidirectional control characters checking is on. See enum
609	cpp_bidirectional_level. */
610	unsigned char cpp_warn_bidirectional;
611
612	/* True if libcpp should warn about invalid UTF-8 characters in comments.
613	2 if it should be a pedwarn. */
614	unsigned char cpp_warn_invalid_utf8;
615
616	/* True if libcpp should warn about invalid forms of delimited or named
617	escape sequences. */
618	bool cpp_warn_unicode;
619
620	/* True if -finput-charset= option has been used explicitly. */
621	bool cpp_input_charset_explicit;
622
623	/* -Wleading-whitespace= value. */
624	unsigned char cpp_warn_leading_whitespace;
625
626	/* -Wtrailing-whitespace= value. */
627	unsigned char cpp_warn_trailing_whitespace;
628
629	/* -ftabstop= value. */
630	unsigned int cpp_tabstop;
631
632	/* Dependency generation. */
633	struct
634	{
635	/* Style of header dependencies to generate. */
636	enum cpp_deps_style style;
637
638	/* Structured format of module dependencies to generate. */
639	enum cpp_fdeps_format fdeps_format;
640
641	/* Assume missing files are generated files. */
642	bool missing_files;
643
644	/* Generate phony targets for each dependency apart from the first
645	one. */
646	bool phony_targets;
647
648	/* Generate dependency info for modules. */
649	bool modules;
650
651	/* If true, no dependency is generated on the main file. */
652	bool ignore_main_file;
653
654	/* If true, intend to use the preprocessor output (e.g., for compilation)
655	in addition to the dependency info. */
656	bool need_preprocessor_output;
657	} deps;
658
659	/* Target-specific features set by the front end or client. */
660
661	/* Precision for target CPP arithmetic, target characters, target
662	ints and target wide characters, respectively. */
663	size_t precision, char_precision, int_precision, wchar_precision;
664
665	/* True means chars (wide chars, UTF-8 chars) are unsigned. */
666	bool unsigned_char, unsigned_wchar, unsigned_utf8char;
667
668	/* True if the most significant byte in a word has the lowest
669	address in memory. */
670	bool bytes_big_endian;
671
672	/* Nonzero means __STDC__ should have the value 0 in system headers. */
673	unsigned char stdc_0_in_system_headers;
674
675	/* True disables tokenization outside of preprocessing directives. */
676	bool directives_only;
677
678	/* True enables canonicalization of system header file paths. */
679	bool canonical_system_headers;
680
681	/* The maximum depth of the nested #include. */
682	unsigned int max_include_depth;
683
684	cpp_main_search main_search : 8;
685	};
686
687	#if GCC_VERSION >= 3005
688	#define ATTRIBUTE_CPP_PPDIAG(m, n) \
689	__attribute__ ((__format__ (__gcc_diag__, m , n))) ATTRIBUTE_NONNULL(m)
690	#else
691	#define ATTRIBUTE_CPP_PPDIAG(m, n) ATTRIBUTE_NONNULL(m)
692	#endif
693
694	/* Diagnostic levels. To get a diagnostic without associating a
695	position in the translation unit with it, use cpp_error_with_line
696	with a line number of zero. */
697
698	enum cpp_diagnostic_level {
699	/* Warning, an error with -Werror. */
700	CPP_DL_WARNING = 0,
701	/* Same as CPP_DL_WARNING, except it is not suppressed in system headers. */
702	CPP_DL_WARNING_SYSHDR,
703	/* Warning, an error with -pedantic-errors or -Werror. */
704	CPP_DL_PEDWARN,
705	/* An error. */
706	CPP_DL_ERROR,
707	/* An internal consistency check failed. Prints "internal error: ",
708	otherwise the same as CPP_DL_ERROR. */
709	CPP_DL_ICE,
710	/* An informative note following a warning. */
711	CPP_DL_NOTE,
712	/* A fatal error. */
713	CPP_DL_FATAL
714	};
715
716	/* Warning reason codes. Use a reason code of CPP_W_NONE for unclassified
717	warnings and diagnostics that are not warnings. */
718
719	enum cpp_warning_reason {
720	CPP_W_NONE = 0,
721	CPP_W_DEPRECATED,
722	CPP_W_COMMENTS,
723	CPP_W_MISSING_INCLUDE_DIRS,
724	CPP_W_TRIGRAPHS,
725	CPP_W_MULTICHAR,
726	CPP_W_TRADITIONAL,
727	CPP_W_LONG_LONG,
728	CPP_W_ENDIF_LABELS,
729	CPP_W_NUM_SIGN_CHANGE,
730	CPP_W_VARIADIC_MACROS,
731	CPP_W_BUILTIN_MACRO_REDEFINED,
732	CPP_W_DOLLARS,
733	CPP_W_UNDEF,
734	CPP_W_UNUSED_MACROS,
735	CPP_W_CXX_OPERATOR_NAMES,
736	CPP_W_NORMALIZE,
737	CPP_W_INVALID_PCH,
738	CPP_W_WARNING_DIRECTIVE,
739	CPP_W_LITERAL_SUFFIX,
740	CPP_W_SIZE_T_LITERALS,
741	CPP_W_DATE_TIME,
742	CPP_W_PEDANTIC,
743	CPP_W_C90_C99_COMPAT,
744	CPP_W_C11_C23_COMPAT,
745	CPP_W_C23_C2Y_COMPAT,
746	CPP_W_CXX11_COMPAT,
747	CPP_W_CXX20_COMPAT,
748	CPP_W_CXX14_EXTENSIONS,
749	CPP_W_CXX17_EXTENSIONS,
750	CPP_W_CXX20_EXTENSIONS,
751	CPP_W_CXX23_EXTENSIONS,
752	CPP_W_CXX26_EXTENSIONS,
753	CPP_W_EXPANSION_TO_DEFINED,
754	CPP_W_BIDIRECTIONAL,
755	CPP_W_INVALID_UTF8,
756	CPP_W_UNICODE,
757	CPP_W_HEADER_GUARD,
758	CPP_W_PRAGMA_ONCE_OUTSIDE_HEADER,
759	CPP_W_LEADING_WHITESPACE,
760	CPP_W_TRAILING_WHITESPACE
761	};
762
763	/* Callback for header lookup for HEADER, which is the name of a
764	source file. It is used as a method of last resort to find headers
765	that are not otherwise found during the normal include processing.
766	The return value is the malloced name of a header to try and open,
767	if any, or NULL otherwise. This callback is called only if the
768	header is otherwise unfound. */
769	typedef const char *(*missing_header_cb)(cpp_reader *, const char *header, cpp_dir **);
770
771	/* Call backs to cpplib client. */
772	struct cpp_callbacks
773	{
774	/* Called when a new line of preprocessed output is started. */
775	void (*line_change) (cpp_reader *, const cpp_token *, int);
776
777	/* Called when switching to/from a new file.
778	The line_map is for the new file. It is NULL if there is no new file.
779	(In C this happens when done with <built-in>+<command line> and also
780	when done with a main file.) This can be used for resource cleanup. */
781	void (*file_change) (cpp_reader *, const line_map_ordinary *);
782
783	void (*dir_change) (cpp_reader *, const char *);
784	void (*include) (cpp_reader *, location_t, const unsigned char *,
785	const char *, int, const cpp_token **);
786	void (*define) (cpp_reader *, location_t, cpp_hashnode *);
787	void (*undef) (cpp_reader *, location_t, cpp_hashnode *);
788	void (*ident) (cpp_reader *, location_t, const cpp_string *);
789	void (*def_pragma) (cpp_reader *, location_t);
790	int (*valid_pch) (cpp_reader *, const char *, int);
791	void (*read_pch) (cpp_reader *, const char *, int, const char *);
792	missing_header_cb missing_header;
793
794	/* Context-sensitive macro support. Returns macro (if any) that should
795	be expanded. */
796	cpp_hashnode * (*macro_to_expand) (cpp_reader *, const cpp_token *);
797
798	/* Called to emit a diagnostic. This callback receives the
799	translated message. */
800	bool (*diagnostic) (cpp_reader *,
801	enum cpp_diagnostic_level,
802	enum cpp_warning_reason,
803	rich_location *,
804	const char *, va_list *)
805	ATTRIBUTE_CPP_PPDIAG (5,0);
806
807	/* Callbacks for when a macro is expanded, or tested (whether
808	defined or not at the time) in #ifdef, #ifndef or "defined". */
809	void (*used_define) (cpp_reader *, location_t, cpp_hashnode *);
810	void (*used_undef) (cpp_reader *, location_t, cpp_hashnode *);
811	/* Called before #define and #undef or other macro definition
812	changes are processed. */
813	void (*before_define) (cpp_reader *);
814	/* Called whenever a macro is expanded or tested.
815	Second argument is the location of the start of the current expansion. */
816	void (*used) (cpp_reader *, location_t, cpp_hashnode *);
817
818	/* Callback to identify whether an attribute exists. */
819	int (*has_attribute) (cpp_reader *, bool);
820
821	/* Callback to determine whether a built-in function is recognized. */
822	int (*has_builtin) (cpp_reader *);
823
824	/* Callback to determine whether a feature is available. */
825	int (*has_feature) (cpp_reader *, bool);
826
827	/* Callback that can change a user lazy into normal macro. */
828	void (*user_lazy_macro) (cpp_reader *, cpp_macro *, unsigned);
829
830	/* Callback to handle deferred cpp_macros. */
831	cpp_macro *(*user_deferred_macro) (cpp_reader *, location_t, cpp_hashnode *);
832
833	/* Callback to parse SOURCE_DATE_EPOCH from environment. */
834	time_t (*get_source_date_epoch) (cpp_reader *);
835
836	/* Callback for providing suggestions for misspelled directives. */
837	const char *(*get_suggestion) (cpp_reader *, const char *, const char *const *);
838
839	/* Callback for when a comment is encountered, giving the location
840	of the opening slash, a pointer to the content (which is not
841	necessarily 0-terminated), and the length of the content.
842	The content contains the opening slash-star (or slash-slash),
843	and for C-style comments contains the closing star-slash. For
844	C++-style comments it does not include the terminating newline. */
845	void (*comment) (cpp_reader *, location_t, const unsigned char *,
846	size_t);
847
848	/* Callback for filename remapping in __FILE__ and __BASE_FILE__ macro
849	expansions. */
850	const char *(*remap_filename) (const char*);
851
852	/* Maybe translate a #include into something else. Return a
853	cpp_buffer containing the translation if translating. */
854	char *(*translate_include) (cpp_reader *, line_maps *, location_t,
855	const char *path);
856	};
857
858	#ifdef VMS
859	#define INO_T_CPP ino_t ino[3]
860	#elif defined (_AIX) && SIZEOF_INO_T == 4
861	#define INO_T_CPP ino64_t ino
862	#else
863	#define INO_T_CPP ino_t ino
864	#endif
865
866	#if defined (_AIX) && SIZEOF_DEV_T == 4
867	#define DEV_T_CPP dev64_t dev
868	#else
869	#define DEV_T_CPP dev_t dev
870	#endif
871
872	/* Chain of directories to look for include files in. */
873	struct cpp_dir
874	{
875	/* NULL-terminated singly-linked list. */
876	struct cpp_dir *next;
877
878	/* NAME of the directory, NUL-terminated. */
879	char *name;
880	unsigned int len;
881
882	/* One if a system header, two if a system header that has extern
883	"C" guards for C++. */
884	unsigned char sysp;
885
886	/* Is this a user-supplied directory? */
887	bool user_supplied_p;
888
889	/* The canonicalized NAME as determined by lrealpath. This field
890	is only used by hosts that lack reliable inode numbers. */
891	char *canonical_name;
892
893	/* Mapping of file names for this directory for MS-DOS and related
894	platforms. A NULL-terminated array of (from, to) pairs. */
895	const char **name_map;
896
897	/* Routine to construct pathname, given the search path name and the
898	HEADER we are trying to find, return a constructed pathname to
899	try and open. If this is NULL, the constructed pathname is as
900	constructed by append_file_to_dir. */
901	char *(*construct) (const char *header, cpp_dir *dir);
902
903	/* The C front end uses these to recognize duplicated
904	directories in the search path. */
905	INO_T_CPP;
906	DEV_T_CPP;
907	};
908
909	/* The kind of the cpp_macro. */
910	enum cpp_macro_kind {
911	cmk_macro, /* An ISO macro (token expansion). */
912	cmk_assert, /* An assertion. */
913	cmk_traditional /* A traditional macro (text expansion). */
914	};
915
916	/* Each macro definition is recorded in a cpp_macro structure.
917	Variadic macros cannot occur with traditional cpp. */
918	struct GTY(()) cpp_macro {
919	union cpp_parm_u
920	{
921	/* Parameters, if any. If parameter names use extended identifiers,
922	the original spelling of those identifiers, not the canonical
923	UTF-8 spelling, goes here. */
924	cpp_hashnode ** GTY ((tag ("false"),
925	nested_ptr (union tree_node,
926	"%h ? CPP_HASHNODE (GCC_IDENT_TO_HT_IDENT (%h)) : NULL",
927	"%h ? HT_IDENT_TO_GCC_IDENT (HT_NODE (%h)) : NULL"),
928	length ("%1.paramc"))) params;
929
930	/* If this is an assertion, the next one in the chain. */
931	cpp_macro *GTY ((tag ("true"))) next;
932	} GTY ((desc ("%1.kind == cmk_assert"))) parm;
933
934	/* Definition line number. */
935	location_t line;
936
937	/* Number of tokens in body, or bytes for traditional macros. */
938	/* Do we really need 2^32-1 range here? */
939	unsigned int count;
940
941	/* Number of parameters. */
942	unsigned short paramc;
943
944	/* Non-zero if this is a user-lazy macro, value provided by user. */
945	unsigned char lazy;
946
947	/* The kind of this macro (ISO, trad or assert) */
948	unsigned kind : 2;
949
950	/* If a function-like macro. */
951	unsigned int fun_like : 1;
952
953	/* If a variadic macro. */
954	unsigned int variadic : 1;
955
956	/* If macro defined in system header. */
957	unsigned int syshdr : 1;
958
959	/* Nonzero if it has been expanded or had its existence tested. */
960	unsigned int used : 1;
961
962	/* Indicate whether the tokens include extra CPP_PASTE tokens at the
963	end to track invalid redefinitions with consecutive CPP_PASTE
964	tokens. */
965	unsigned int extra_tokens : 1;
966
967	/* Imported C++20 macro (from a header unit). */
968	unsigned int imported_p : 1;
969
970	/* 0 bits spare (32-bit). 32 on 64-bit target. */
971
972	union cpp_exp_u
973	{
974	/* Trailing array of replacement tokens (ISO), or assertion body value. */
975	cpp_token GTY ((tag ("false"), length ("%1.count"))) tokens[1];
976
977	/* Pointer to replacement text (traditional). See comment at top
978	of cpptrad.c for how traditional function-like macros are
979	encoded. */
980	const unsigned char *GTY ((tag ("true"))) text;
981	} GTY ((desc ("%1.kind == cmk_traditional"))) exp;
982	};
983
984	/* Poisoned identifiers are flagged NODE_POISONED. NODE_OPERATOR (C++
985	only) indicates an identifier that behaves like an operator such as
986	"xor". NODE_DIAGNOSTIC is for speed in lex_token: it indicates a
987	diagnostic may be required for this node. Currently this only
988	applies to __VA_ARGS__, poisoned identifiers, and -Wc++-compat
989	warnings about NODE_OPERATOR. */
990
991	/* Hash node flags. */
992	#define NODE_OPERATOR (1 << 0) /* C++ named operator. */
993	#define NODE_POISONED (1 << 1) /* Poisoned identifier. */
994	#define NODE_DIAGNOSTIC (1 << 2) /* Possible diagnostic when lexed. */
995	#define NODE_WARN (1 << 3) /* Warn if redefined or undefined. */
996	#define NODE_DISABLED (1 << 4) /* A disabled macro. */
997	#define NODE_USED (1 << 5) /* Dumped with -dU. */
998	#define NODE_CONDITIONAL (1 << 6) /* Conditional macro */
999	#define NODE_WARN_OPERATOR (1 << 7) /* Warn about C++ named operator. */
1000	#define NODE_MODULE (1 << 8) /* C++-20 module-related name. */
1001
1002	/* Different flavors of hash node. */
1003	enum node_type
1004	{
1005	NT_VOID = 0, /* Maybe an assert? */
1006	NT_MACRO_ARG, /* A macro arg. */
1007	NT_USER_MACRO, /* A user macro. */
1008	NT_BUILTIN_MACRO, /* A builtin macro. */
1009	NT_MACRO_MASK = NT_USER_MACRO /* Mask for either macro kind. */
1010	};
1011
1012	/* Different flavors of builtin macro. _Pragma is an operator, but we
1013	handle it with the builtin code for efficiency reasons. */
1014	enum cpp_builtin_type
1015	{
1016	BT_SPECLINE = 0, /* `__LINE__' */
1017	BT_DATE, /* `__DATE__' */
1018	BT_FILE, /* `__FILE__' */
1019	BT_FILE_NAME, /* `__FILE_NAME__' */
1020	BT_BASE_FILE, /* `__BASE_FILE__' */
1021	BT_INCLUDE_LEVEL, /* `__INCLUDE_LEVEL__' */
1022	BT_TIME, /* `__TIME__' */
1023	BT_STDC, /* `__STDC__' */
1024	BT_PRAGMA, /* `_Pragma' operator */
1025	BT_TIMESTAMP, /* `__TIMESTAMP__' */
1026	BT_COUNTER, /* `__COUNTER__' */
1027	BT_HAS_ATTRIBUTE, /* `__has_attribute(x)' */
1028	BT_HAS_STD_ATTRIBUTE, /* `__has_c_attribute(x)' */
1029	BT_HAS_BUILTIN, /* `__has_builtin(x)' */
1030	BT_HAS_INCLUDE, /* `__has_include(x)' */
1031	BT_HAS_INCLUDE_NEXT, /* `__has_include_next(x)' */
1032	BT_HAS_EMBED, /* `__has_embed(x)' */
1033	BT_HAS_FEATURE, /* `__has_feature(x)' */
1034	BT_HAS_EXTENSION /* `__has_extension(x)' */
1035	};
1036
1037	#define CPP_HASHNODE(HNODE) ((cpp_hashnode *) (HNODE))
1038	#define HT_NODE(NODE) (&(NODE)->ident)
1039	#define NODE_LEN(NODE) HT_LEN (HT_NODE (NODE))
1040	#define NODE_NAME(NODE) HT_STR (HT_NODE (NODE))
1041
1042	/* The common part of an identifier node shared amongst all 3 C front
1043	ends. Also used to store CPP identifiers, which are a superset of
1044	identifiers in the grammatical sense. */
1045
1046	union GTY(()) _cpp_hashnode_value {
1047	/* Assert (maybe NULL) */
1048	cpp_macro * GTY((tag ("NT_VOID"))) answers;
1049	/* Macro (maybe NULL) */
1050	cpp_macro * GTY((tag ("NT_USER_MACRO"))) macro;
1051	/* Code for a builtin macro. */
1052	enum cpp_builtin_type GTY ((tag ("NT_BUILTIN_MACRO"))) builtin;
1053	/* Macro argument index. */
1054	unsigned short GTY ((tag ("NT_MACRO_ARG"))) arg_index;
1055	};
1056
1057	struct GTY(()) cpp_hashnode {
1058	struct ht_identifier ident;
1059	unsigned int is_directive : 1;
1060	unsigned int directive_index : 7; /* If is_directive,
1061	then index into directive table.
1062	Otherwise, a NODE_OPERATOR. */
1063	unsigned int rid_code : 8; /* Rid code - for front ends. */
1064	unsigned int flags : 9; /* CPP flags. */
1065	ENUM_BITFIELD(node_type) type : 2; /* CPP node type. */
1066
1067	/* 5 bits spare. */
1068
1069	/* The deferred cookie is applicable to NT_USER_MACRO or NT_VOID.
1070	The latter for when a macro had a prevailing undef.
1071	On a 64-bit system there would be 32-bits of padding to the value
1072	field. So placing the deferred index here is not costly. */
1073	unsigned deferred; /* Deferred cookie */
1074
1075	union _cpp_hashnode_value GTY ((desc ("%1.type"))) value;
1076	};
1077
1078	/* Extra information we may need to store per identifier, which is needed rarely
1079	enough that it's not worth adding directly into the main identifier hash. */
1080	struct GTY(()) cpp_hashnode_extra
1081	{
1082	struct ht_identifier ident;
1083	location_t poisoned_loc;
1084	};
1085
1086	/* A class for iterating through the source locations within a
1087	string token (before escapes are interpreted, and before
1088	concatenation). */
1089
1090	class cpp_string_location_reader {
1091	public:
1092	cpp_string_location_reader (location_t src_loc,
1093	line_maps *line_table);
1094
1095	source_range get_next ();
1096
1097	private:
1098	location_t m_loc;
1099	int m_offset_per_column;
1100	};
1101
1102	/* A class for storing the source ranges of all of the characters within
1103	a string literal, after escapes are interpreted, and after
1104	concatenation.
1105
1106	This is not GTY-marked, as instances are intended to be temporary. */
1107
1108	class cpp_substring_ranges
1109	{
1110	public:
1111	cpp_substring_ranges ();
1112	~cpp_substring_ranges ();
1113
1114	int get_num_ranges () const { return m_num_ranges; }
1115	source_range get_range (int idx) const
1116	{
1117	linemap_assert (idx < m_num_ranges);
1118	return m_ranges[idx];
1119	}
1120
1121	void add_range (source_range range);
1122	void add_n_ranges (int num, cpp_string_location_reader &loc_reader);
1123
1124	private:
1125	source_range *m_ranges;
1126	int m_num_ranges;
1127	int m_alloc_ranges;
1128	};
1129
1130	/* Call this first to get a handle to pass to other functions.
1131
1132	The first hash table argument is for associating a struct cpp_hashnode
1133	with each identifier. The second hash table argument is for associating
1134	a struct cpp_hashnode_extra with each identifier that needs one. For
1135	either, pass in a NULL pointer if you want cpplib to create and manage
1136	the hash table itself, or else pass a suitably initialized hash table to
1137	be managed external to libcpp, as is done by the C-family frontends. */
1138	extern cpp_reader *cpp_create_reader (enum c_lang, struct ht *,
1139	class line_maps *,
1140	struct ht * = nullptr);
1141
1142	/* Reset the cpp_reader's line_map. This is only used after reading a
1143	PCH file. */
1144	extern void cpp_set_line_map (cpp_reader *, class line_maps *);
1145
1146	/* Call this to change the selected language standard (e.g. because of
1147	command line options). */
1148	extern void cpp_set_lang (cpp_reader *, enum c_lang);
1149
1150	/* Set the include paths. */
1151	extern void cpp_set_include_chains (cpp_reader *, cpp_dir *, cpp_dir *,
1152	cpp_dir *, int);
1153
1154	/* Call these to get pointers to the options, callback, and deps
1155	structures for a given reader. These pointers are good until you
1156	call cpp_finish on that reader. You can either edit the callbacks
1157	through the pointer returned from cpp_get_callbacks, or set them
1158	with cpp_set_callbacks. */
1159	extern cpp_options *cpp_get_options (cpp_reader *) ATTRIBUTE_PURE;
1160	extern cpp_callbacks *cpp_get_callbacks (cpp_reader *) ATTRIBUTE_PURE;
1161	extern void cpp_set_callbacks (cpp_reader *, cpp_callbacks *);
1162	extern class mkdeps *cpp_get_deps (cpp_reader *) ATTRIBUTE_PURE;
1163
1164	extern const char *cpp_probe_header_unit (cpp_reader *, const char *file,
1165	bool angle_p, location_t);
1166
1167	/* Call these to get name data about the various compile-time
1168	charsets. */
1169	extern const char *cpp_get_narrow_charset_name (cpp_reader *) ATTRIBUTE_PURE;
1170	extern const char *cpp_get_wide_charset_name (cpp_reader *) ATTRIBUTE_PURE;
1171
1172	extern location_t cpp_get_diagnostic_override_loc (const cpp_reader *);
1173
1174	/* This function reads the file, but does not start preprocessing. It
1175	returns the name of the original file; this is the same as the
1176	input file, except for preprocessed input. This will generate at
1177	least one file change callback, and possibly a line change callback
1178	too. If there was an error opening the file, it returns NULL. */
1179	extern const char *cpp_read_main_file (cpp_reader *, const char *,
1180	bool injecting = false);
1181	extern location_t cpp_main_loc (const cpp_reader *);
1182
1183	/* Adjust for the main file to be an include. */
1184	extern void cpp_retrofit_as_include (cpp_reader *);
1185
1186	/* Set up built-ins with special behavior. Use cpp_init_builtins()
1187	instead unless your know what you are doing. */
1188	extern void cpp_init_special_builtins (cpp_reader *);
1189
1190	/* Set up built-ins like __FILE__. */
1191	extern void cpp_init_builtins (cpp_reader *, int);
1192
1193	/* This is called after options have been parsed, and partially
1194	processed. */
1195	extern void cpp_post_options (cpp_reader *);
1196
1197	/* Set up translation to the target character set. */
1198	extern void cpp_init_iconv (cpp_reader *);
1199
1200	/* Call this to finish preprocessing. If you requested dependency
1201	generation, pass open stream(s) to write the information to,
1202	otherwise NULL. It is your responsibility to close the stream(s). */
1203	extern void cpp_finish (cpp_reader *, FILE *deps_stream, FILE *fdeps_stream = NULL);
1204
1205	/* Call this to release the handle at the end of preprocessing. Any
1206	use of the handle after this function returns is invalid. */
1207	extern void cpp_destroy (cpp_reader *);
1208
1209	extern unsigned int cpp_token_len (const cpp_token *);
1210	extern unsigned char *cpp_token_as_text (cpp_reader *, const cpp_token *);
1211	extern unsigned char *cpp_spell_token (cpp_reader *, const cpp_token *,
1212	unsigned char *, bool);
1213	extern void cpp_register_pragma (cpp_reader *, const char *, const char *,
1214	void (*) (cpp_reader *), bool);
1215	extern void cpp_register_deferred_pragma (cpp_reader *, const char *,
1216	const char *, unsigned, bool, bool);
1217	extern int cpp_avoid_paste (cpp_reader *, const cpp_token *,
1218	const cpp_token *);
1219	extern const cpp_token *cpp_get_token (cpp_reader *);
1220	extern const cpp_token *cpp_get_token_with_location (cpp_reader *,
1221	location_t *);
1222	inline bool cpp_user_macro_p (const cpp_hashnode *node)
1223	{
1224	return node->type == NT_USER_MACRO;
1225	}
1226	inline bool cpp_builtin_macro_p (const cpp_hashnode *node)
1227	{
1228	return node->type == NT_BUILTIN_MACRO;
1229	}
1230	inline bool cpp_macro_p (const cpp_hashnode *node)
1231	{
1232	return node->type & NT_MACRO_MASK;
1233	}
1234	inline cpp_macro *cpp_set_deferred_macro (cpp_hashnode *node,
1235	cpp_macro *forced = NULL)
1236	{
1237	cpp_macro *old = node->value.macro;
1238
1239	node->value.macro = forced;
1240	node->type = NT_USER_MACRO;
1241	node->flags &= ~NODE_USED;
1242
1243	return old;
1244	}
1245	cpp_macro *cpp_get_deferred_macro (cpp_reader *, cpp_hashnode *, location_t);
1246
1247	/* Returns true if NODE is a function-like user macro. */
1248	inline bool cpp_fun_like_macro_p (cpp_hashnode *node)
1249	{
1250	return cpp_user_macro_p (node) && node->value.macro->fun_like;
1251	}
1252
1253	extern const unsigned char *cpp_macro_definition (cpp_reader *, cpp_hashnode *);
1254	extern const unsigned char *cpp_macro_definition (cpp_reader *, cpp_hashnode *,
1255	const cpp_macro *);
1256	inline location_t cpp_macro_definition_location (cpp_hashnode *node)
1257	{
1258	const cpp_macro *macro = node->value.macro;
1259	return macro ? macro->line : 0;
1260	}
1261	/* Return an idempotent time stamp (possibly from SOURCE_DATE_EPOCH). */
1262	enum class CPP_time_kind
1263	{
1264	FIXED = -1, /* Fixed time via source epoch. */
1265	DYNAMIC = -2, /* Dynamic via time(2). */
1266	UNKNOWN = -3 /* Wibbly wobbly, timey wimey. */
1267	};
1268	extern CPP_time_kind cpp_get_date (cpp_reader *, time_t *);
1269
1270	extern void _cpp_backup_tokens (cpp_reader *, unsigned int);
1271	extern const cpp_token *cpp_peek_token (cpp_reader *, int);
1272
1273	/* Evaluate a CPP_*CHAR* token. */
1274	extern cppchar_t cpp_interpret_charconst (cpp_reader *, const cpp_token *,
1275	unsigned int *, int *);
1276	/* Evaluate a vector of CPP_*STRING* tokens. */
1277	extern bool cpp_interpret_string (cpp_reader *,
1278	const cpp_string *, size_t,
1279	cpp_string *, enum cpp_ttype);
1280	extern const char *cpp_interpret_string_ranges (cpp_reader *pfile,
1281	const cpp_string *from,
1282	cpp_string_location_reader *,
1283	size_t count,
1284	cpp_substring_ranges *out,
1285	enum cpp_ttype type);
1286	extern bool cpp_interpret_string_notranslate (cpp_reader *,
1287	const cpp_string *, size_t,
1288	cpp_string *, enum cpp_ttype);
1289
1290	/* Convert a host character constant to the execution character set. */
1291	extern cppchar_t cpp_host_to_exec_charset (cpp_reader *, cppchar_t);
1292
1293	/* Used to register macros and assertions, perhaps from the command line.
1294	The text is the same as the command line argument. */
1295	extern void cpp_define (cpp_reader *, const char *);
1296	extern void cpp_define_unused (cpp_reader *, const char *);
1297	extern void cpp_define_formatted (cpp_reader *pfile,
1298	const char *fmt, ...) ATTRIBUTE_PRINTF_2;
1299	extern void cpp_define_formatted_unused (cpp_reader *pfile,
1300	const char *fmt,
1301	...) ATTRIBUTE_PRINTF_2;
1302	extern void cpp_assert (cpp_reader *, const char *);
1303	extern void cpp_undef (cpp_reader *, const char *);
1304	extern void cpp_unassert (cpp_reader *, const char *);
1305
1306	/* Mark a node as a lazily defined macro. */
1307	extern void cpp_define_lazily (cpp_reader *, cpp_hashnode *node, unsigned N);
1308
1309	/* Undefine all macros and assertions. */
1310	extern void cpp_undef_all (cpp_reader *);
1311
1312	extern cpp_buffer *cpp_push_buffer (cpp_reader *, const unsigned char *,
1313	size_t, int);
1314	extern int cpp_defined (cpp_reader *, const unsigned char *, int);
1315
1316	/* A preprocessing number. Code assumes that any unused high bits of
1317	the double integer are set to zero. */
1318
1319	/* This type has to be equal to unsigned HOST_WIDE_INT, see
1320	gcc/c-family/c-lex.cc. */
1321	typedef uint64_t cpp_num_part;
1322	typedef struct cpp_num cpp_num;
1323	struct cpp_num
1324	{
1325	cpp_num_part high;
1326	cpp_num_part low;
1327	bool unsignedp; /* True if value should be treated as unsigned. */
1328	bool overflow; /* True if the most recent calculation overflowed. */
1329	};
1330
1331	/* cpplib provides two interfaces for interpretation of preprocessing
1332	numbers.
1333
1334	cpp_classify_number categorizes numeric constants according to
1335	their field (integer, floating point, or invalid), radix (decimal,
1336	octal, hexadecimal), and type suffixes. */
1337
1338	#define CPP_N_CATEGORY 0x000F
1339	#define CPP_N_INVALID 0x0000
1340	#define CPP_N_INTEGER 0x0001
1341	#define CPP_N_FLOATING 0x0002
1342
1343	#define CPP_N_WIDTH 0x00F0
1344	#define CPP_N_SMALL 0x0010 /* int, float, short _Fract/Accum */
1345	#define CPP_N_MEDIUM 0x0020 /* long, double, long _Fract/_Accum. */
1346	#define CPP_N_LARGE 0x0040 /* long long, long double,
1347	long long _Fract/Accum. */
1348
1349	#define CPP_N_WIDTH_MD 0xF0000 /* machine defined. */
1350	#define CPP_N_MD_W 0x10000
1351	#define CPP_N_MD_Q 0x20000
1352
1353	#define CPP_N_RADIX 0x0F00
1354	#define CPP_N_DECIMAL 0x0100
1355	#define CPP_N_HEX 0x0200
1356	#define CPP_N_OCTAL 0x0400
1357	#define CPP_N_BINARY 0x0800
1358
1359	#define CPP_N_UNSIGNED 0x1000 /* Properties. */
1360	#define CPP_N_IMAGINARY 0x2000
1361	#define CPP_N_DFLOAT 0x4000
1362	#define CPP_N_DEFAULT 0x8000
1363
1364	#define CPP_N_FRACT 0x100000 /* Fract types. */
1365	#define CPP_N_ACCUM 0x200000 /* Accum types. */
1366	#define CPP_N_FLOATN 0x400000 /* _FloatN types. */
1367	#define CPP_N_FLOATNX 0x800000 /* _FloatNx types. */
1368
1369	#define CPP_N_USERDEF 0x1000000 /* C++11 user-defined literal. */
1370
1371	#define CPP_N_SIZE_T 0x2000000 /* C++23 size_t literal. */
1372	#define CPP_N_BFLOAT16 0x4000000 /* std::bfloat16_t type. */
1373	#define CPP_N_BITINT 0x8000000 /* C23 _BitInt literal. */
1374
1375	#define CPP_N_WIDTH_FLOATN_NX 0xF0000000 /* _FloatN / _FloatNx value
1376	of N, divided by 16. */
1377	#define CPP_FLOATN_SHIFT 24
1378	#define CPP_FLOATN_MAX 0xF0
1379
1380	/* Classify a CPP_NUMBER token. The return value is a combination of
1381	the flags from the above sets. */
1382	extern unsigned cpp_classify_number (cpp_reader *, const cpp_token *,
1383	const char **, location_t);
1384
1385	/* Return the classification flags for a float suffix. */
1386	extern unsigned int cpp_interpret_float_suffix (cpp_reader *, const char *,
1387	size_t);
1388
1389	/* Return the classification flags for an int suffix. */
1390	extern unsigned int cpp_interpret_int_suffix (cpp_reader *, const char *,
1391	size_t);
1392
1393	/* Evaluate a token classified as category CPP_N_INTEGER. */
1394	extern cpp_num cpp_interpret_integer (cpp_reader *, const cpp_token *,
1395	unsigned int);
1396
1397	/* Sign extend a number, with PRECISION significant bits and all
1398	others assumed clear, to fill out a cpp_num structure. */
1399	cpp_num cpp_num_sign_extend (cpp_num, size_t);
1400
1401	/* Output a diagnostic of some kind. */
1402	extern bool cpp_error (cpp_reader *, enum cpp_diagnostic_level,
1403	const char *msgid, ...)
1404	ATTRIBUTE_CPP_PPDIAG (3, 4);
1405	extern bool cpp_warning (cpp_reader *, enum cpp_warning_reason,
1406	const char *msgid, ...)
1407	ATTRIBUTE_CPP_PPDIAG (3, 4);
1408	extern bool cpp_pedwarning (cpp_reader *, enum cpp_warning_reason,
1409	const char *msgid, ...)
1410	ATTRIBUTE_CPP_PPDIAG (3, 4);
1411	extern bool cpp_warning_syshdr (cpp_reader *, enum cpp_warning_reason reason,
1412	const char *msgid, ...)
1413	ATTRIBUTE_CPP_PPDIAG (3, 4);
1414
1415	/* As their counterparts above, but use RICHLOC. */
1416	extern bool cpp_warning_at (cpp_reader *, enum cpp_warning_reason,
1417	rich_location *richloc, const char *msgid, ...)
1418	ATTRIBUTE_CPP_PPDIAG (4, 5);
1419	extern bool cpp_pedwarning_at (cpp_reader *, enum cpp_warning_reason,
1420	rich_location *richloc, const char *msgid, ...)
1421	ATTRIBUTE_CPP_PPDIAG (4, 5);
1422
1423	/* Output a diagnostic with "MSGID: " preceding the
1424	error string of errno. No location is printed. */
1425	extern bool cpp_errno (cpp_reader *, enum cpp_diagnostic_level,
1426	const char *msgid);
1427	/* Similarly, but with "FILENAME: " instead of "MSGID: ", where
1428	the filename is not localized. */
1429	extern bool cpp_errno_filename (cpp_reader *, enum cpp_diagnostic_level,
1430	const char *filename, location_t loc);
1431
1432	/* Same as cpp_error, except additionally specifies a position as a
1433	(translation unit) physical line and physical column. If the line is
1434	zero, then no location is printed. */
1435	extern bool cpp_error_with_line (cpp_reader *, enum cpp_diagnostic_level,
1436	location_t, unsigned,
1437	const char *msgid, ...)
1438	ATTRIBUTE_CPP_PPDIAG (5, 6);
1439	extern bool cpp_warning_with_line (cpp_reader *, enum cpp_warning_reason,
1440	location_t, unsigned,
1441	const char *msgid, ...)
1442	ATTRIBUTE_CPP_PPDIAG (5, 6);
1443	extern bool cpp_pedwarning_with_line (cpp_reader *, enum cpp_warning_reason,
1444	location_t, unsigned,
1445	const char *msgid, ...)
1446	ATTRIBUTE_CPP_PPDIAG (5, 6);
1447	extern bool cpp_warning_with_line_syshdr (cpp_reader *, enum cpp_warning_reason,
1448	location_t, unsigned,
1449	const char *msgid, ...)
1450	ATTRIBUTE_CPP_PPDIAG (5, 6);
1451
1452	extern bool cpp_error_at (cpp_reader * pfile, enum cpp_diagnostic_level,
1453	location_t src_loc, const char *msgid, ...)
1454	ATTRIBUTE_CPP_PPDIAG (4, 5);
1455
1456	extern bool cpp_error_at (cpp_reader * pfile, enum cpp_diagnostic_level,
1457	rich_location *richloc, const char *msgid, ...)
1458	ATTRIBUTE_CPP_PPDIAG (4, 5);
1459
1460	/* In lex.cc */
1461	extern int cpp_ideq (const cpp_token *, const char *);
1462	extern void cpp_output_line (cpp_reader *, FILE *);
1463	extern unsigned char *cpp_output_line_to_string (cpp_reader *,
1464	const unsigned char *);
1465	extern const unsigned char *cpp_alloc_token_string
1466	(cpp_reader *, const unsigned char *, unsigned);
1467	extern void cpp_output_token (const cpp_token *, FILE *);
1468	extern const char *cpp_type2name (enum cpp_ttype, unsigned char flags);
1469	/* Returns the value of an escape sequence, truncated to the correct
1470	target precision. PSTR points to the input pointer, which is just
1471	after the backslash. LIMIT is how much text we have. WIDE is true
1472	if the escape sequence is part of a wide character constant or
1473	string literal. Handles all relevant diagnostics. */
1474	extern cppchar_t cpp_parse_escape (cpp_reader *, const unsigned char ** pstr,
1475	const unsigned char *limit, int wide);
1476
1477	/* Structure used to hold a comment block at a given location in the
1478	source code. */
1479
1480	typedef struct
1481	{
1482	/* Text of the comment including the terminators. */
1483	char *comment;
1484
1485	/* source location for the given comment. */
1486	location_t sloc;
1487	} cpp_comment;
1488
1489	/* Structure holding all comments for a given cpp_reader. */
1490
1491	typedef struct
1492	{
1493	/* table of comment entries. */
1494	cpp_comment *entries;
1495
1496	/* number of actual entries entered in the table. */
1497	int count;
1498
1499	/* number of entries allocated currently. */
1500	int allocated;
1501	} cpp_comment_table;
1502
1503	/* Returns the table of comments encountered by the preprocessor. This
1504	table is only populated when pfile->state.save_comments is true. */
1505	extern cpp_comment_table *cpp_get_comments (cpp_reader *);
1506
1507	/* In hash.c */
1508
1509	/* Lookup an identifier in the hashtable. Puts the identifier in the
1510	table if it is not already there. */
1511	extern cpp_hashnode *cpp_lookup (cpp_reader *, const unsigned char *,
1512	unsigned int);
1513
1514	typedef int (*cpp_cb) (cpp_reader *, cpp_hashnode *, void *);
1515	extern void cpp_forall_identifiers (cpp_reader *, cpp_cb, void *);
1516
1517	/* In macro.cc */
1518	extern void cpp_scan_nooutput (cpp_reader *);
1519	extern int cpp_sys_macro_p (cpp_reader *);
1520	extern unsigned char *cpp_quote_string (unsigned char *, const unsigned char *,
1521	unsigned int);
1522	extern bool cpp_compare_macros (const cpp_macro *macro1,
1523	const cpp_macro *macro2);
1524
1525	/* In files.cc */
1526	extern bool cpp_included (cpp_reader *, const char *);
1527	extern bool cpp_included_before (cpp_reader *, const char *, location_t);
1528	extern void cpp_make_system_header (cpp_reader *, int, int);
1529	extern bool cpp_push_include (cpp_reader *, const char *);
1530	extern bool cpp_push_default_include (cpp_reader *, const char *);
1531	extern void cpp_change_file (cpp_reader *, enum lc_reason, const char *);
1532	extern const char *cpp_get_path (struct _cpp_file *);
1533	extern cpp_dir *cpp_get_dir (struct _cpp_file *);
1534	extern cpp_buffer *cpp_get_buffer (cpp_reader *);
1535	extern struct _cpp_file *cpp_get_file (cpp_buffer *);
1536	extern cpp_buffer *cpp_get_prev (cpp_buffer *);
1537	extern void cpp_clear_file_cache (cpp_reader *);
1538
1539	/* cpp_get_converted_source returns the contents of the given file, as it exists
1540	after cpplib has read it and converted it from the input charset to the
1541	source charset. Return struct will be zero-filled if the data could not be
1542	read for any reason. The data starts at the DATA pointer, but the TO_FREE
1543	pointer is what should be passed to free(), as there may be an offset. */
1544	struct cpp_converted_source
1545	{
1546	char *to_free;
1547	char *data;
1548	size_t len;
1549	};
1550	cpp_converted_source cpp_get_converted_source (const char *fname,
1551	const char *input_charset);
1552
1553	/* In pch.cc */
1554	struct save_macro_data;
1555	extern int cpp_save_state (cpp_reader *, FILE *);
1556	extern int cpp_write_pch_deps (cpp_reader *, FILE *);
1557	extern int cpp_write_pch_state (cpp_reader *, FILE *);
1558	extern int cpp_valid_state (cpp_reader *, const char *, int);
1559	extern void cpp_prepare_state (cpp_reader *, struct save_macro_data **);
1560	extern int cpp_read_state (cpp_reader *, const char *, FILE *,
1561	struct save_macro_data *);
1562
1563	/* In lex.cc */
1564	extern void cpp_force_token_locations (cpp_reader *, location_t);
1565	extern void cpp_stop_forcing_token_locations (cpp_reader *);
1566	enum CPP_DO_task
1567	{
1568	CPP_DO_print,
1569	CPP_DO_location,
1570	CPP_DO_token
1571	};
1572
1573	extern void cpp_directive_only_process (cpp_reader *pfile,
1574	void *data,
1575	void (*cb) (cpp_reader *,
1576	CPP_DO_task,
1577	void *data, ...));
1578
1579	/* In expr.cc */
1580	extern enum cpp_ttype cpp_userdef_string_remove_type
1581	(enum cpp_ttype type);
1582	extern enum cpp_ttype cpp_userdef_string_add_type
1583	(enum cpp_ttype type);
1584	extern enum cpp_ttype cpp_userdef_char_remove_type
1585	(enum cpp_ttype type);
1586	extern enum cpp_ttype cpp_userdef_char_add_type
1587	(enum cpp_ttype type);
1588	extern bool cpp_userdef_string_p
1589	(enum cpp_ttype type);
1590	extern bool cpp_userdef_char_p
1591	(enum cpp_ttype type);
1592	extern const char * cpp_get_userdef_suffix
1593	(const cpp_token *);
1594
1595	/* In charset.cc */
1596
1597	/* The result of attempting to decode a run of UTF-8 bytes. */
1598
1599	struct cpp_decoded_char
1600	{
1601	const char *m_start_byte;
1602	const char *m_next_byte;
1603
1604	bool m_valid_ch;
1605	cppchar_t m_ch;
1606	};
1607
1608	/* Information for mapping between code points and display columns.
1609
1610	This is a tabstop value, along with a callback for getting the
1611	widths of characters. Normally this callback is cpp_wcwidth, but we
1612	support other schemes for escaping non-ASCII unicode as a series of
1613	ASCII chars when printing the user's source code in diagnostic-show-locus.cc
1614
1615	For example, consider:
1616	- the Unicode character U+03C0 "GREEK SMALL LETTER PI" (UTF-8: 0xCF 0x80)
1617	- the Unicode character U+1F642 "SLIGHTLY SMILING FACE"
1618	(UTF-8: 0xF0 0x9F 0x99 0x82)
1619	- the byte 0xBF (a stray trailing byte of a UTF-8 character)
1620	Normally U+03C0 would occupy one display column, U+1F642
1621	would occupy two display columns, and the stray byte would be
1622	printed verbatim as one display column.
1623
1624	However when escaping them as unicode code points as "<U+03C0>"
1625	and "<U+1F642>" they occupy 8 and 9 display columns respectively,
1626	and when escaping them as bytes as "<CF><80>" and "<F0><9F><99><82>"
1627	they occupy 8 and 16 display columns respectively. In both cases
1628	the stray byte is escaped to <BF> as 4 display columns. */
1629
1630	struct cpp_char_column_policy
1631	{
1632	cpp_char_column_policy (int tabstop,
1633	int (*width_cb) (cppchar_t c))
1634	: m_tabstop (tabstop),
1635	m_undecoded_byte_width (1),
1636	m_width_cb (width_cb)
1637	{}
1638
1639	int m_tabstop;
1640	/* Width in display columns of a stray byte that isn't decodable
1641	as UTF-8. */
1642	int m_undecoded_byte_width;
1643	int (*m_width_cb) (cppchar_t c);
1644	};
1645
1646	/* A class to manage the state while converting a UTF-8 sequence to cppchar_t
1647	and computing the display width one character at a time. */
1648	class cpp_display_width_computation {
1649	public:
1650	cpp_display_width_computation (const char *data, int data_length,
1651	const cpp_char_column_policy &policy);
1652	const char *next_byte () const { return m_next; }
1653	int bytes_processed () const { return m_next - m_begin; }
1654	int bytes_left () const { return m_bytes_left; }
1655	bool done () const { return !bytes_left (); }
1656	int display_cols_processed () const { return m_display_cols; }
1657
1658	int process_next_codepoint (cpp_decoded_char *out);
1659	int advance_display_cols (int n);
1660
1661	private:
1662	const char *const m_begin;
1663	const char *m_next;
1664	size_t m_bytes_left;
1665	const cpp_char_column_policy &m_policy;
1666	int m_display_cols;
1667	};
1668
1669	/* Convenience functions that are simple use cases for class
1670	cpp_display_width_computation. Tab characters will be expanded to spaces
1671	as determined by POLICY.m_tabstop, and non-printable-ASCII characters
1672	will be escaped as per POLICY. */
1673
1674	int cpp_byte_column_to_display_column (const char *data, int data_length,
1675	int column,
1676	const cpp_char_column_policy &policy);
1677	inline int cpp_display_width (const char *data, int data_length,
1678	const cpp_char_column_policy &policy)
1679	{
1680	return cpp_byte_column_to_display_column (data, data_length, column: data_length,
1681	policy);
1682	}
1683	int cpp_display_column_to_byte_column (const char *data, int data_length,
1684	int display_col,
1685	const cpp_char_column_policy &policy);
1686	int cpp_wcwidth (cppchar_t c);
1687
1688	bool cpp_input_conversion_is_trivial (const char *input_charset);
1689	int cpp_check_utf8_bom (const char *data, size_t data_length);
1690	bool cpp_valid_utf8_p (const char *data, size_t num_bytes);
1691
1692	bool cpp_is_combining_char (cppchar_t c);
1693	bool cpp_is_printable_char (cppchar_t c);
1694
1695	enum cpp_xid_property {
1696	CPP_XID_START = 1,
1697	CPP_XID_CONTINUE = 2
1698	};
1699
1700	unsigned int cpp_check_xid_property (cppchar_t c);
1701
1702	/* In errors.cc */
1703
1704	/* RAII class to suppress CPP diagnostics in the current scope. */
1705	class cpp_auto_suppress_diagnostics
1706	{
1707	public:
1708	explicit cpp_auto_suppress_diagnostics (cpp_reader *pfile);
1709	~cpp_auto_suppress_diagnostics ();
1710	private:
1711	cpp_reader *const m_pfile;
1712	const decltype (cpp_callbacks::diagnostic) m_cb;
1713	};
1714
1715	#endif /* ! LIBCPP_CPPLIB_H */
1716