2 Copyright (C) 1986-2022 Free Software Foundation, Inc.
3 Contributed by Per Bothner, 1994-95.
4 Based on CCCP program by Paul Rubin, June 1986
5 Adapted to ANSI C, Richard Stallman, Jan 1987
7 This program is free software; you can redistribute it and/or modify it
8 under the terms of the GNU General Public License as published by the
9 Free Software Foundation; either version 3, or (at your option) any
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
26 #include "localedir.h"
27 #include "filenames.h"
29 #ifndef ENABLE_CANONICAL_SYSTEM_HEADERS
30 #ifdef HAVE_DOS_BASED_FILE_SYSTEM
31 #define ENABLE_CANONICAL_SYSTEM_HEADERS 1
33 #define ENABLE_CANONICAL_SYSTEM_HEADERS 0
37 static void init_library (void);
38 static void mark_named_operators (cpp_reader
*, int);
39 static bool read_original_filename (cpp_reader
*);
40 static void read_original_directory (cpp_reader
*);
41 static void post_options (cpp_reader
*);
43 /* If we have designated initializers (GCC >2.7) these tables can be
44 initialized, constant data. Otherwise, they have to be filled in at
46 #if HAVE_DESIGNATED_INITIALIZERS
48 #define init_trigraph_map() /* Nothing. */
49 #define TRIGRAPH_MAP \
50 __extension__ const uchar _cpp_trigraph_map[UCHAR_MAX + 1] = {
53 #define s(p, v) [p] = v,
57 #define TRIGRAPH_MAP uchar _cpp_trigraph_map[UCHAR_MAX + 1] = { 0 }; \
58 static void init_trigraph_map (void) { \
59 unsigned char *x = _cpp_trigraph_map;
62 #define s(p, v) x[p] = v;
67 s('=', '#') s(')', ']') s('!', '|')
68 s('(', '[') s('\'', '^') s('>', '}')
69 s('/', '\\') s('<', '{') s('-', '~')
76 /* A set of booleans indicating what CPP features each source language
82 char extended_numbers
;
83 char extended_identifiers
;
90 char binary_constants
;
91 char digit_separators
;
93 char utf8_char_literals
;
99 char warning_directive
;
102 static const struct lang_flags lang_defaults
[] =
103 { /* c99 c++ xnum xid c11 std digr ulit rlit udlit bincst digsep trig u8chlit vaopt scope dfp szlit elifdef warndir */
104 /* GNUC89 */ { 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0 },
105 /* GNUC99 */ { 1, 0, 1, 1, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0 },
106 /* GNUC11 */ { 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0 },
107 /* GNUC17 */ { 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0 },
108 /* GNUC2X */ { 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1 },
109 /* STDC89 */ { 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0 },
110 /* STDC94 */ { 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0 },
111 /* STDC99 */ { 1, 0, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0 },
112 /* STDC11 */ { 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0 },
113 /* STDC17 */ { 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0 },
114 /* STDC2X */ { 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 0, 1, 1, 0, 1, 1 },
115 /* GNUCXX */ { 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0 },
116 /* CXX98 */ { 0, 1, 0, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0 },
117 /* GNUCXX11 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0 },
118 /* CXX11 */ { 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0 },
119 /* GNUCXX14 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 0, 0, 0 },
120 /* CXX14 */ { 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0 },
121 /* GNUCXX17 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0 },
122 /* CXX17 */ { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0, 0, 0, 0 },
123 /* GNUCXX20 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0 },
124 /* CXX20 */ { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0 },
125 /* GNUCXX23 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 0 },
126 /* CXX23 */ { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 0 },
127 /* ASM */ { 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
130 /* Sets internal flags correctly for a given language. */
132 cpp_set_lang (cpp_reader
*pfile
, enum c_lang lang
)
134 const struct lang_flags
*l
= &lang_defaults
[(int) lang
];
136 CPP_OPTION (pfile
, lang
) = lang
;
138 CPP_OPTION (pfile
, c99
) = l
->c99
;
139 CPP_OPTION (pfile
, cplusplus
) = l
->cplusplus
;
140 CPP_OPTION (pfile
, extended_numbers
) = l
->extended_numbers
;
141 CPP_OPTION (pfile
, extended_identifiers
) = l
->extended_identifiers
;
142 CPP_OPTION (pfile
, c11_identifiers
) = l
->c11_identifiers
;
143 CPP_OPTION (pfile
, std
) = l
->std
;
144 CPP_OPTION (pfile
, digraphs
) = l
->digraphs
;
145 CPP_OPTION (pfile
, uliterals
) = l
->uliterals
;
146 CPP_OPTION (pfile
, rliterals
) = l
->rliterals
;
147 CPP_OPTION (pfile
, user_literals
) = l
->user_literals
;
148 CPP_OPTION (pfile
, binary_constants
) = l
->binary_constants
;
149 CPP_OPTION (pfile
, digit_separators
) = l
->digit_separators
;
150 CPP_OPTION (pfile
, trigraphs
) = l
->trigraphs
;
151 CPP_OPTION (pfile
, utf8_char_literals
) = l
->utf8_char_literals
;
152 CPP_OPTION (pfile
, va_opt
) = l
->va_opt
;
153 CPP_OPTION (pfile
, scope
) = l
->scope
;
154 CPP_OPTION (pfile
, dfp_constants
) = l
->dfp_constants
;
155 CPP_OPTION (pfile
, size_t_literals
) = l
->size_t_literals
;
156 CPP_OPTION (pfile
, elifdef
) = l
->elifdef
;
157 CPP_OPTION (pfile
, warning_directive
) = l
->warning_directive
;
160 /* Initialize library global state. */
164 static int initialized
= 0;
172 /* Set up the trigraph map. This doesn't need to do anything if
173 we were compiled with a compiler that supports C99 designated
175 init_trigraph_map ();
178 (void) bindtextdomain (PACKAGE
, LOCALEDIR
);
183 /* Initialize a cpp_reader structure. */
185 cpp_create_reader (enum c_lang lang
, cpp_hash_table
*table
,
186 class line_maps
*line_table
)
190 /* Initialize this instance of the library if it hasn't been already. */
193 pfile
= XCNEW (cpp_reader
);
194 memset (&pfile
->base_context
, 0, sizeof (pfile
->base_context
));
196 cpp_set_lang (pfile
, lang
);
197 CPP_OPTION (pfile
, warn_multichar
) = 1;
198 CPP_OPTION (pfile
, discard_comments
) = 1;
199 CPP_OPTION (pfile
, discard_comments_in_macro_exp
) = 1;
200 CPP_OPTION (pfile
, max_include_depth
) = 200;
201 CPP_OPTION (pfile
, operator_names
) = 1;
202 CPP_OPTION (pfile
, warn_trigraphs
) = 2;
203 CPP_OPTION (pfile
, warn_endif_labels
) = 1;
204 CPP_OPTION (pfile
, cpp_warn_c90_c99_compat
) = -1;
205 CPP_OPTION (pfile
, cpp_warn_c11_c2x_compat
) = -1;
206 CPP_OPTION (pfile
, cpp_warn_cxx11_compat
) = 0;
207 CPP_OPTION (pfile
, cpp_warn_cxx20_compat
) = 0;
208 CPP_OPTION (pfile
, cpp_warn_deprecated
) = 1;
209 CPP_OPTION (pfile
, cpp_warn_long_long
) = 0;
210 CPP_OPTION (pfile
, dollars_in_ident
) = 1;
211 CPP_OPTION (pfile
, warn_dollars
) = 1;
212 CPP_OPTION (pfile
, warn_variadic_macros
) = 1;
213 CPP_OPTION (pfile
, warn_builtin_macro_redefined
) = 1;
214 CPP_OPTION (pfile
, cpp_warn_implicit_fallthrough
) = 0;
215 /* By default, track locations of tokens resulting from macro
216 expansion. The '2' means, track the locations with the highest
217 accuracy. Read the comments for struct
218 cpp_options::track_macro_expansion to learn about the other
220 CPP_OPTION (pfile
, track_macro_expansion
) = 2;
221 CPP_OPTION (pfile
, warn_normalize
) = normalized_C
;
222 CPP_OPTION (pfile
, warn_literal_suffix
) = 1;
223 CPP_OPTION (pfile
, canonical_system_headers
)
224 = ENABLE_CANONICAL_SYSTEM_HEADERS
;
225 CPP_OPTION (pfile
, ext_numeric_literals
) = 1;
226 CPP_OPTION (pfile
, warn_date_time
) = 0;
227 CPP_OPTION (pfile
, cpp_warn_bidirectional
) = bidirectional_unpaired
;
229 /* Default CPP arithmetic to something sensible for the host for the
230 benefit of dumb users like fix-header. */
231 CPP_OPTION (pfile
, precision
) = CHAR_BIT
* sizeof (long);
232 CPP_OPTION (pfile
, char_precision
) = CHAR_BIT
;
233 CPP_OPTION (pfile
, wchar_precision
) = CHAR_BIT
* sizeof (int);
234 CPP_OPTION (pfile
, int_precision
) = CHAR_BIT
* sizeof (int);
235 CPP_OPTION (pfile
, unsigned_char
) = 0;
236 CPP_OPTION (pfile
, unsigned_wchar
) = 1;
237 CPP_OPTION (pfile
, unsigned_utf8char
) = 1;
238 CPP_OPTION (pfile
, bytes_big_endian
) = 1; /* does not matter */
240 /* Default to no charset conversion. */
241 CPP_OPTION (pfile
, narrow_charset
) = _cpp_default_encoding ();
242 CPP_OPTION (pfile
, wide_charset
) = 0;
244 /* Default the input character set to UTF-8. */
245 CPP_OPTION (pfile
, input_charset
) = _cpp_default_encoding ();
247 /* A fake empty "directory" used as the starting point for files
248 looked up without a search path. Name cannot be '/' because we
249 don't want to prepend anything at all to filenames using it. All
250 other entries are correct zero-initialized. */
251 pfile
->no_search_path
.name
= (char *) "";
253 /* Initialize the line map. */
254 pfile
->line_table
= line_table
;
256 /* Initialize lexer state. */
257 pfile
->state
.save_comments
= ! CPP_OPTION (pfile
, discard_comments
);
259 /* Set up static tokens. */
260 pfile
->avoid_paste
.type
= CPP_PADDING
;
261 pfile
->avoid_paste
.val
.source
= NULL
;
262 pfile
->avoid_paste
.src_loc
= 0;
263 pfile
->endarg
.type
= CPP_EOF
;
264 pfile
->endarg
.flags
= 0;
265 pfile
->endarg
.src_loc
= 0;
267 /* Create a token buffer for the lexer. */
268 _cpp_init_tokenrun (&pfile
->base_run
, 250);
269 pfile
->cur_run
= &pfile
->base_run
;
270 pfile
->cur_token
= pfile
->base_run
.base
;
272 /* Initialize the base context. */
273 pfile
->context
= &pfile
->base_context
;
274 pfile
->base_context
.c
.macro
= 0;
275 pfile
->base_context
.prev
= pfile
->base_context
.next
= 0;
277 /* Aligned and unaligned storage. */
278 pfile
->a_buff
= _cpp_get_buff (pfile
, 0);
279 pfile
->u_buff
= _cpp_get_buff (pfile
, 0);
281 /* Initialize table for push_macro/pop_macro. */
282 pfile
->pushed_macros
= 0;
284 /* Do not force token locations by default. */
285 pfile
->forced_token_location
= 0;
287 /* Note the timestamp is unset. */
288 pfile
->time_stamp
= time_t (-1);
289 pfile
->time_stamp_kind
= 0;
291 /* The expression parser stack. */
292 _cpp_expand_op_stack (pfile
);
294 /* Initialize the buffer obstack. */
295 obstack_specify_allocation (&pfile
->buffer_ob
, 0, 0, xmalloc
, free
);
297 _cpp_init_files (pfile
);
299 _cpp_init_hashtable (pfile
, table
);
304 /* Set the line_table entry in PFILE. This is called after reading a
305 PCH file, as the old line_table will be incorrect. */
307 cpp_set_line_map (cpp_reader
*pfile
, class line_maps
*line_table
)
309 pfile
->line_table
= line_table
;
312 /* Free resources used by PFILE. Accessing PFILE after this function
313 returns leads to undefined behavior. Returns the error count. */
315 cpp_destroy (cpp_reader
*pfile
)
317 cpp_context
*context
, *contextn
;
318 struct def_pragma_macro
*pmacro
;
319 tokenrun
*run
, *runn
;
322 free (pfile
->op_stack
);
324 while (CPP_BUFFER (pfile
) != NULL
)
325 _cpp_pop_buffer (pfile
);
327 free (pfile
->out
.base
);
329 if (pfile
->macro_buffer
)
331 free (pfile
->macro_buffer
);
332 pfile
->macro_buffer
= NULL
;
333 pfile
->macro_buffer_len
= 0;
337 deps_free (pfile
->deps
);
338 obstack_free (&pfile
->buffer_ob
, 0);
340 _cpp_destroy_hashtable (pfile
);
341 _cpp_cleanup_files (pfile
);
342 _cpp_destroy_iconv (pfile
);
344 _cpp_free_buff (pfile
->a_buff
);
345 _cpp_free_buff (pfile
->u_buff
);
346 _cpp_free_buff (pfile
->free_buffs
);
348 for (run
= &pfile
->base_run
; run
; run
= runn
)
352 if (run
!= &pfile
->base_run
)
356 for (context
= pfile
->base_context
.next
; context
; context
= contextn
)
358 contextn
= context
->next
;
362 if (pfile
->comments
.entries
)
364 for (i
= 0; i
< pfile
->comments
.count
; i
++)
365 free (pfile
->comments
.entries
[i
].comment
);
367 free (pfile
->comments
.entries
);
369 if (pfile
->pushed_macros
)
373 pmacro
= pfile
->pushed_macros
;
374 pfile
->pushed_macros
= pmacro
->next
;
378 while (pfile
->pushed_macros
);
384 /* This structure defines one built-in identifier. A node will be
385 entered in the hash table under the name NAME, with value VALUE.
387 There are two tables of these. builtin_array holds all the
388 "builtin" macros: these are handled by builtin_macro() in
389 macro.cc. Builtin is somewhat of a misnomer -- the property of
390 interest is that these macros require special code to compute their
391 expansions. The value is a "cpp_builtin_type" enumerator.
393 operator_array holds the C++ named operators. These are keywords
394 which act as aliases for punctuators. In C++, they cannot be
395 altered through #define, and #if recognizes them as operators. In
396 C, these are not entered into the hash table at all (but see
397 <iso646.h>). The value is a token-type enumerator. */
400 const uchar
*const name
;
401 const unsigned short len
;
402 const unsigned short value
;
403 const bool always_warn_if_redefined
;
406 #define B(n, t, f) { DSC(n), t, f }
407 static const struct builtin_macro builtin_array
[] =
409 B("__TIMESTAMP__", BT_TIMESTAMP
, false),
410 B("__TIME__", BT_TIME
, false),
411 B("__DATE__", BT_DATE
, false),
412 B("__FILE__", BT_FILE
, false),
413 B("__FILE_NAME__", BT_FILE_NAME
, false),
414 B("__BASE_FILE__", BT_BASE_FILE
, false),
415 B("__LINE__", BT_SPECLINE
, true),
416 B("__INCLUDE_LEVEL__", BT_INCLUDE_LEVEL
, true),
417 B("__COUNTER__", BT_COUNTER
, true),
418 /* Make sure to update the list of built-in
419 function-like macros in traditional.cc:
420 fun_like_macro() when adding more following */
421 B("__has_attribute", BT_HAS_ATTRIBUTE
, true),
422 B("__has_c_attribute", BT_HAS_STD_ATTRIBUTE
, true),
423 B("__has_cpp_attribute", BT_HAS_ATTRIBUTE
, true),
424 B("__has_builtin", BT_HAS_BUILTIN
, true),
425 B("__has_include", BT_HAS_INCLUDE
, true),
426 B("__has_include_next",BT_HAS_INCLUDE_NEXT
, true),
427 /* Keep builtins not used for -traditional-cpp at the end, and
428 update init_builtins() if any more are added. */
429 B("_Pragma", BT_PRAGMA
, true),
430 B("__STDC__", BT_STDC
, true),
434 struct builtin_operator
436 const uchar
*const name
;
437 const unsigned short len
;
438 const unsigned short value
;
441 #define B(n, t) { DSC(n), t }
442 static const struct builtin_operator operator_array
[] =
444 B("and", CPP_AND_AND
),
445 B("and_eq", CPP_AND_EQ
),
446 B("bitand", CPP_AND
),
448 B("compl", CPP_COMPL
),
450 B("not_eq", CPP_NOT_EQ
),
452 B("or_eq", CPP_OR_EQ
),
454 B("xor_eq", CPP_XOR_EQ
)
458 /* Mark the C++ named operators in the hash table. */
460 mark_named_operators (cpp_reader
*pfile
, int flags
)
462 const struct builtin_operator
*b
;
464 for (b
= operator_array
;
465 b
< (operator_array
+ ARRAY_SIZE (operator_array
));
468 cpp_hashnode
*hp
= cpp_lookup (pfile
, b
->name
, b
->len
);
470 hp
->is_directive
= 0;
471 hp
->directive_index
= b
->value
;
475 /* Helper function of cpp_type2name. Return the string associated with
476 named operator TYPE. */
478 cpp_named_operator2name (enum cpp_ttype type
)
480 const struct builtin_operator
*b
;
482 for (b
= operator_array
;
483 b
< (operator_array
+ ARRAY_SIZE (operator_array
));
486 if (type
== b
->value
)
487 return (const char *) b
->name
;
494 cpp_init_special_builtins (cpp_reader
*pfile
)
496 const struct builtin_macro
*b
;
497 size_t n
= ARRAY_SIZE (builtin_array
);
499 if (CPP_OPTION (pfile
, traditional
))
501 else if (! CPP_OPTION (pfile
, stdc_0_in_system_headers
)
502 || CPP_OPTION (pfile
, std
))
505 for (b
= builtin_array
; b
< builtin_array
+ n
; b
++)
507 if ((b
->value
== BT_HAS_ATTRIBUTE
508 || b
->value
== BT_HAS_STD_ATTRIBUTE
509 || b
->value
== BT_HAS_BUILTIN
)
510 && (CPP_OPTION (pfile
, lang
) == CLK_ASM
511 || pfile
->cb
.has_attribute
== NULL
))
513 cpp_hashnode
*hp
= cpp_lookup (pfile
, b
->name
, b
->len
);
514 hp
->type
= NT_BUILTIN_MACRO
;
515 if (b
->always_warn_if_redefined
)
516 hp
->flags
|= NODE_WARN
;
517 hp
->value
.builtin
= (enum cpp_builtin_type
) b
->value
;
521 /* Restore macro C to builtin macro definition. */
524 _cpp_restore_special_builtin (cpp_reader
*pfile
, struct def_pragma_macro
*c
)
526 size_t len
= strlen (c
->name
);
528 for (const struct builtin_macro
*b
= builtin_array
;
529 b
< builtin_array
+ ARRAY_SIZE (builtin_array
); b
++)
530 if (b
->len
== len
&& memcmp (c
->name
, b
->name
, len
+ 1) == 0)
532 cpp_hashnode
*hp
= cpp_lookup (pfile
, b
->name
, b
->len
);
533 hp
->type
= NT_BUILTIN_MACRO
;
534 if (b
->always_warn_if_redefined
)
535 hp
->flags
|= NODE_WARN
;
536 hp
->value
.builtin
= (enum cpp_builtin_type
) b
->value
;
540 /* Read the builtins table above and enter them, and language-specific
541 macros, into the hash table. HOSTED is true if this is a hosted
544 cpp_init_builtins (cpp_reader
*pfile
, int hosted
)
546 cpp_init_special_builtins (pfile
);
548 if (!CPP_OPTION (pfile
, traditional
)
549 && (! CPP_OPTION (pfile
, stdc_0_in_system_headers
)
550 || CPP_OPTION (pfile
, std
)))
551 _cpp_define_builtin (pfile
, "__STDC__ 1");
553 if (CPP_OPTION (pfile
, cplusplus
))
555 /* C++23 is not yet a standard. For now, use an invalid
556 * year/month, 202100L, which is larger than 202002L. */
557 if (CPP_OPTION (pfile
, lang
) == CLK_CXX23
558 || CPP_OPTION (pfile
, lang
) == CLK_GNUCXX23
)
559 _cpp_define_builtin (pfile
, "__cplusplus 202100L");
560 else if (CPP_OPTION (pfile
, lang
) == CLK_CXX20
561 || CPP_OPTION (pfile
, lang
) == CLK_GNUCXX20
)
562 _cpp_define_builtin (pfile
, "__cplusplus 202002L");
563 else if (CPP_OPTION (pfile
, lang
) == CLK_CXX17
564 || CPP_OPTION (pfile
, lang
) == CLK_GNUCXX17
)
565 _cpp_define_builtin (pfile
, "__cplusplus 201703L");
566 else if (CPP_OPTION (pfile
, lang
) == CLK_CXX14
567 || CPP_OPTION (pfile
, lang
) == CLK_GNUCXX14
)
568 _cpp_define_builtin (pfile
, "__cplusplus 201402L");
569 else if (CPP_OPTION (pfile
, lang
) == CLK_CXX11
570 || CPP_OPTION (pfile
, lang
) == CLK_GNUCXX11
)
571 _cpp_define_builtin (pfile
, "__cplusplus 201103L");
573 _cpp_define_builtin (pfile
, "__cplusplus 199711L");
575 else if (CPP_OPTION (pfile
, lang
) == CLK_ASM
)
576 _cpp_define_builtin (pfile
, "__ASSEMBLER__ 1");
577 else if (CPP_OPTION (pfile
, lang
) == CLK_STDC94
)
578 _cpp_define_builtin (pfile
, "__STDC_VERSION__ 199409L");
579 else if (CPP_OPTION (pfile
, lang
) == CLK_STDC2X
580 || CPP_OPTION (pfile
, lang
) == CLK_GNUC2X
)
581 _cpp_define_builtin (pfile
, "__STDC_VERSION__ 202000L");
582 else if (CPP_OPTION (pfile
, lang
) == CLK_STDC17
583 || CPP_OPTION (pfile
, lang
) == CLK_GNUC17
)
584 _cpp_define_builtin (pfile
, "__STDC_VERSION__ 201710L");
585 else if (CPP_OPTION (pfile
, lang
) == CLK_STDC11
586 || CPP_OPTION (pfile
, lang
) == CLK_GNUC11
)
587 _cpp_define_builtin (pfile
, "__STDC_VERSION__ 201112L");
588 else if (CPP_OPTION (pfile
, c99
))
589 _cpp_define_builtin (pfile
, "__STDC_VERSION__ 199901L");
591 if (CPP_OPTION (pfile
, uliterals
)
592 && !(CPP_OPTION (pfile
, cplusplus
)
593 && (CPP_OPTION (pfile
, lang
) == CLK_GNUCXX
594 || CPP_OPTION (pfile
, lang
) == CLK_CXX98
)))
596 _cpp_define_builtin (pfile
, "__STDC_UTF_16__ 1");
597 _cpp_define_builtin (pfile
, "__STDC_UTF_32__ 1");
601 _cpp_define_builtin (pfile
, "__STDC_HOSTED__ 1");
603 _cpp_define_builtin (pfile
, "__STDC_HOSTED__ 0");
605 if (CPP_OPTION (pfile
, objc
))
606 _cpp_define_builtin (pfile
, "__OBJC__ 1");
609 /* Sanity-checks are dependent on command-line options, so it is
610 called as a subroutine of cpp_read_main_file. */
612 static void sanity_checks (cpp_reader
*);
613 static void sanity_checks (cpp_reader
*pfile
)
616 size_t max_precision
= 2 * CHAR_BIT
* sizeof (cpp_num_part
);
618 /* Sanity checks for assumptions about CPP arithmetic and target
619 type precisions made by cpplib. */
622 cpp_error (pfile
, CPP_DL_ICE
, "cppchar_t must be an unsigned type");
624 if (CPP_OPTION (pfile
, precision
) > max_precision
)
625 cpp_error (pfile
, CPP_DL_ICE
,
626 "preprocessor arithmetic has maximum precision of %lu bits;"
627 " target requires %lu bits",
628 (unsigned long) max_precision
,
629 (unsigned long) CPP_OPTION (pfile
, precision
));
631 if (CPP_OPTION (pfile
, precision
) < CPP_OPTION (pfile
, int_precision
))
632 cpp_error (pfile
, CPP_DL_ICE
,
633 "CPP arithmetic must be at least as precise as a target int");
635 if (CPP_OPTION (pfile
, char_precision
) < 8)
636 cpp_error (pfile
, CPP_DL_ICE
, "target char is less than 8 bits wide");
638 if (CPP_OPTION (pfile
, wchar_precision
) < CPP_OPTION (pfile
, char_precision
))
639 cpp_error (pfile
, CPP_DL_ICE
,
640 "target wchar_t is narrower than target char");
642 if (CPP_OPTION (pfile
, int_precision
) < CPP_OPTION (pfile
, char_precision
))
643 cpp_error (pfile
, CPP_DL_ICE
,
644 "target int is narrower than target char");
646 /* This is assumed in eval_token() and could be fixed if necessary. */
647 if (sizeof (cppchar_t
) > sizeof (cpp_num_part
))
648 cpp_error (pfile
, CPP_DL_ICE
,
649 "CPP half-integer narrower than CPP character");
651 if (CPP_OPTION (pfile
, wchar_precision
) > BITS_PER_CPPCHAR_T
)
652 cpp_error (pfile
, CPP_DL_ICE
,
653 "CPP on this host cannot handle wide character constants over"
654 " %lu bits, but the target requires %lu bits",
655 (unsigned long) BITS_PER_CPPCHAR_T
,
656 (unsigned long) CPP_OPTION (pfile
, wchar_precision
));
659 # define sanity_checks(PFILE)
662 /* This is called after options have been parsed, and partially
665 cpp_post_options (cpp_reader
*pfile
)
669 sanity_checks (pfile
);
671 post_options (pfile
);
673 /* Mark named operators before handling command line macros. */
675 if (CPP_OPTION (pfile
, cplusplus
) && CPP_OPTION (pfile
, operator_names
))
676 flags
|= NODE_OPERATOR
;
677 if (CPP_OPTION (pfile
, warn_cxx_operator_names
))
678 flags
|= NODE_DIAGNOSTIC
| NODE_WARN_OPERATOR
;
680 mark_named_operators (pfile
, flags
);
683 /* Setup for processing input from the file named FNAME, or stdin if
684 it is the empty string. Return the original filename on success
685 (e.g. foo.i->foo.c), or NULL on failure. INJECTING is true if
686 there may be injected headers before line 1 of the main file. */
688 cpp_read_main_file (cpp_reader
*pfile
, const char *fname
, bool injecting
)
690 if (mkdeps
*deps
= cpp_get_deps (pfile
))
691 /* Set the default target (if there is none already). */
692 deps_add_default_target (deps
, fname
);
695 = _cpp_find_file (pfile
, fname
,
696 CPP_OPTION (pfile
, preprocessed
) ? &pfile
->no_search_path
697 : CPP_OPTION (pfile
, main_search
) == CMS_user
698 ? pfile
->quote_include
699 : CPP_OPTION (pfile
, main_search
) == CMS_system
700 ? pfile
->bracket_include
: &pfile
->no_search_path
,
701 /*angle=*/0, _cpp_FFK_NORMAL
, 0);
703 if (_cpp_find_failed (pfile
->main_file
))
706 _cpp_stack_file (pfile
, pfile
->main_file
,
707 injecting
|| CPP_OPTION (pfile
, preprocessed
)
708 ? IT_PRE_MAIN
: IT_MAIN
, 0);
710 /* For foo.i, read the original filename foo.c now, for the benefit
711 of the front ends. */
712 if (CPP_OPTION (pfile
, preprocessed
))
713 if (!read_original_filename (pfile
))
715 /* We're on line 1 after all. */
716 auto *last
= linemap_check_ordinary
717 (LINEMAPS_LAST_MAP (pfile
->line_table
, false));
719 /* Inform of as-if a file change. */
720 _cpp_do_file_change (pfile
, LC_RENAME_VERBATIM
, LINEMAP_FILE (last
),
721 LINEMAP_LINE (last
), LINEMAP_SYSP (last
));
724 auto *map
= LINEMAPS_LAST_ORDINARY_MAP (pfile
->line_table
);
725 pfile
->main_loc
= MAP_START_LOCATION (map
);
727 return ORDINARY_MAP_FILE_NAME (map
);
731 cpp_main_loc (const cpp_reader
*pfile
)
733 return pfile
->main_loc
;
736 /* For preprocessed files, if the very first characters are
737 '#<SPACE>[01]<SPACE>', then handle a line directive so we know the
738 original file name. This will generate file_change callbacks,
739 which the front ends must handle appropriately given their state of
740 initialization. We peek directly into the character buffer, so
741 that we're not confused by otherwise-skipped white space &
742 comments. We can be very picky, because this should have been
743 machine-generated text (by us, no less). This way we do not
744 interfere with the module directive state machine. */
747 read_original_filename (cpp_reader
*pfile
)
749 auto *buf
= pfile
->buffer
->next_line
;
751 if (pfile
->buffer
->rlimit
- buf
> 4
754 // Also permit '1', as that's what used to be here
755 && (buf
[2] == '0' || buf
[2] == '1')
758 const cpp_token
*token
= _cpp_lex_direct (pfile
);
759 gcc_checking_assert (token
->type
== CPP_HASH
);
760 if (_cpp_handle_directive (pfile
, token
->flags
& PREV_WHITE
))
762 read_original_directory (pfile
);
764 auto *penult
= &linemap_check_ordinary
765 (LINEMAPS_LAST_MAP (pfile
->line_table
, false))[-1];
766 if (penult
[1].reason
== LC_RENAME_VERBATIM
)
768 /* Expunge any evidence of the original linemap. */
769 pfile
->line_table
->highest_location
770 = pfile
->line_table
->highest_line
771 = penult
[0].start_location
;
773 penult
[1].start_location
= penult
[0].start_location
;
774 penult
[1].reason
= penult
[0].reason
;
775 penult
[0] = penult
[1];
776 pfile
->line_table
->info_ordinary
.used
--;
777 pfile
->line_table
->info_ordinary
.cache
= 0;
787 /* For preprocessed files, if the tokens following the first filename
788 line is of the form # <line> "/path/name//", handle the
789 directive so we know the original current directory.
791 As with the first line peeking, we can do this without lexing by
794 read_original_directory (cpp_reader
*pfile
)
796 auto *buf
= pfile
->buffer
->next_line
;
798 if (pfile
->buffer
->rlimit
- buf
> 4
801 // Also permit '1', as that's what used to be here
802 && (buf
[2] == '0' || buf
[2] == '1')
805 const cpp_token
*hash
= _cpp_lex_direct (pfile
);
806 gcc_checking_assert (hash
->type
== CPP_HASH
);
807 pfile
->state
.in_directive
= 1;
808 const cpp_token
*number
= _cpp_lex_direct (pfile
);
809 gcc_checking_assert (number
->type
== CPP_NUMBER
);
810 const cpp_token
*string
= _cpp_lex_direct (pfile
);
811 pfile
->state
.in_directive
= 0;
813 const unsigned char *text
= nullptr;
815 if (string
->type
== CPP_STRING
)
817 /* The string value includes the quotes. */
818 text
= string
->val
.str
.text
;
819 len
= string
->val
.str
.len
;
822 || !IS_DIR_SEPARATOR (text
[len
- 2])
823 || !IS_DIR_SEPARATOR (text
[len
- 3]))
825 /* That didn't work out, back out. */
826 _cpp_backup_tokens (pfile
, 3);
830 if (pfile
->cb
.dir_change
)
832 /* Smash the string directly, it's dead at this point */
833 char *smashy
= (char *)text
;
836 pfile
->cb
.dir_change (pfile
, smashy
+ 1);
839 /* We should be at EOL. */
843 /* This is called at the end of preprocessing. It pops the last
844 buffer and writes dependency output.
846 Maybe it should also reset state, such that you could call
847 cpp_start_read with a new filename to restart processing. */
849 cpp_finish (cpp_reader
*pfile
, FILE *deps_stream
)
851 /* Warn about unused macros before popping the final buffer. */
852 if (CPP_OPTION (pfile
, warn_unused_macros
))
853 cpp_forall_identifiers (pfile
, _cpp_warn_if_unused_macro
, NULL
);
855 /* lex.cc leaves the final buffer on the stack. This it so that
856 it returns an unending stream of CPP_EOFs to the client. If we
857 popped the buffer, we'd dereference a NULL buffer pointer and
858 segfault. It's nice to allow the client to do worry-free excess
859 cpp_get_token calls. */
860 while (pfile
->buffer
)
861 _cpp_pop_buffer (pfile
);
864 deps_write (pfile
, deps_stream
, 72);
866 /* Report on headers that could use multiple include guards. */
867 if (CPP_OPTION (pfile
, print_include_names
))
868 _cpp_report_missing_guards (pfile
);
872 post_options (cpp_reader
*pfile
)
874 /* -Wtraditional is not useful in C++ mode. */
875 if (CPP_OPTION (pfile
, cplusplus
))
876 CPP_OPTION (pfile
, cpp_warn_traditional
) = 0;
878 /* Permanently disable macro expansion if we are rescanning
879 preprocessed text. Read preprocesed source in ISO mode. */
880 if (CPP_OPTION (pfile
, preprocessed
))
882 if (!CPP_OPTION (pfile
, directives_only
))
883 pfile
->state
.prevent_expansion
= 1;
884 CPP_OPTION (pfile
, traditional
) = 0;
887 if (CPP_OPTION (pfile
, warn_trigraphs
) == 2)
888 CPP_OPTION (pfile
, warn_trigraphs
) = !CPP_OPTION (pfile
, trigraphs
);
890 if (CPP_OPTION (pfile
, traditional
))
892 CPP_OPTION (pfile
, trigraphs
) = 0;
893 CPP_OPTION (pfile
, warn_trigraphs
) = 0;
896 if (CPP_OPTION (pfile
, module_directives
))
898 /* These unspellable tokens have a leading space. */
899 const char *const inits
[spec_nodes::M_HWM
]
900 = {"export ", "module ", "import ", "__import"};
902 for (int ix
= 0; ix
!= spec_nodes::M_HWM
; ix
++)
904 cpp_hashnode
*node
= cpp_lookup (pfile
, UC (inits
[ix
]),
907 /* Token we pass to the compiler. */
908 pfile
->spec_nodes
.n_modules
[ix
][1] = node
;
910 if (ix
!= spec_nodes::M__IMPORT
)
911 /* Token we recognize when lexing, drop the trailing ' '. */
912 node
= cpp_lookup (pfile
, NODE_NAME (node
), NODE_LEN (node
) - 1);
914 node
->flags
|= NODE_MODULE
;
915 pfile
->spec_nodes
.n_modules
[ix
][0] = node
;