2 Copyright (C) 1986-2021 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
;
100 static const struct lang_flags lang_defaults
[] =
101 { /* c99 c++ xnum xid c11 std digr ulit rlit udlit bincst digsep trig u8chlit vaopt scope dfp szlit */
102 /* GNUC89 */ { 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0 },
103 /* GNUC99 */ { 1, 0, 1, 1, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0 },
104 /* GNUC11 */ { 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0 },
105 /* GNUC17 */ { 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0 },
106 /* GNUC2X */ { 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 0, 0, 1, 1, 1, 1, 0 },
107 /* STDC89 */ { 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0 },
108 /* STDC94 */ { 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0 },
109 /* STDC99 */ { 1, 0, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0 },
110 /* STDC11 */ { 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0 },
111 /* STDC17 */ { 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0 },
112 /* STDC2X */ { 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 1, 1, 0, 1, 1, 0 },
113 /* GNUCXX */ { 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0 },
114 /* CXX98 */ { 0, 1, 0, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0 },
115 /* GNUCXX11 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0 },
116 /* CXX11 */ { 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 0, 1, 0, 0 },
117 /* GNUCXX14 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 0 },
118 /* CXX14 */ { 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 0 },
119 /* GNUCXX17 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 0 },
120 /* CXX17 */ { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0, 0 },
121 /* GNUCXX20 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 0 },
122 /* CXX20 */ { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 0 },
123 /* GNUCXX23 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1 },
124 /* CXX23 */ { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1 },
125 /* ASM */ { 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
128 /* Sets internal flags correctly for a given language. */
130 cpp_set_lang (cpp_reader
*pfile
, enum c_lang lang
)
132 const struct lang_flags
*l
= &lang_defaults
[(int) lang
];
134 CPP_OPTION (pfile
, lang
) = lang
;
136 CPP_OPTION (pfile
, c99
) = l
->c99
;
137 CPP_OPTION (pfile
, cplusplus
) = l
->cplusplus
;
138 CPP_OPTION (pfile
, extended_numbers
) = l
->extended_numbers
;
139 CPP_OPTION (pfile
, extended_identifiers
) = l
->extended_identifiers
;
140 CPP_OPTION (pfile
, c11_identifiers
) = l
->c11_identifiers
;
141 CPP_OPTION (pfile
, std
) = l
->std
;
142 CPP_OPTION (pfile
, digraphs
) = l
->digraphs
;
143 CPP_OPTION (pfile
, uliterals
) = l
->uliterals
;
144 CPP_OPTION (pfile
, rliterals
) = l
->rliterals
;
145 CPP_OPTION (pfile
, user_literals
) = l
->user_literals
;
146 CPP_OPTION (pfile
, binary_constants
) = l
->binary_constants
;
147 CPP_OPTION (pfile
, digit_separators
) = l
->digit_separators
;
148 CPP_OPTION (pfile
, trigraphs
) = l
->trigraphs
;
149 CPP_OPTION (pfile
, utf8_char_literals
) = l
->utf8_char_literals
;
150 CPP_OPTION (pfile
, va_opt
) = l
->va_opt
;
151 CPP_OPTION (pfile
, scope
) = l
->scope
;
152 CPP_OPTION (pfile
, dfp_constants
) = l
->dfp_constants
;
153 CPP_OPTION (pfile
, size_t_literals
) = l
->size_t_literals
;
156 /* Initialize library global state. */
160 static int initialized
= 0;
168 /* Set up the trigraph map. This doesn't need to do anything if
169 we were compiled with a compiler that supports C99 designated
171 init_trigraph_map ();
174 (void) bindtextdomain (PACKAGE
, LOCALEDIR
);
179 /* Initialize a cpp_reader structure. */
181 cpp_create_reader (enum c_lang lang
, cpp_hash_table
*table
,
182 class line_maps
*line_table
)
186 /* Initialize this instance of the library if it hasn't been already. */
189 pfile
= XCNEW (cpp_reader
);
190 memset (&pfile
->base_context
, 0, sizeof (pfile
->base_context
));
192 cpp_set_lang (pfile
, lang
);
193 CPP_OPTION (pfile
, warn_multichar
) = 1;
194 CPP_OPTION (pfile
, discard_comments
) = 1;
195 CPP_OPTION (pfile
, discard_comments_in_macro_exp
) = 1;
196 CPP_OPTION (pfile
, max_include_depth
) = 200;
197 CPP_OPTION (pfile
, operator_names
) = 1;
198 CPP_OPTION (pfile
, warn_trigraphs
) = 2;
199 CPP_OPTION (pfile
, warn_endif_labels
) = 1;
200 CPP_OPTION (pfile
, cpp_warn_c90_c99_compat
) = -1;
201 CPP_OPTION (pfile
, cpp_warn_c11_c2x_compat
) = -1;
202 CPP_OPTION (pfile
, cpp_warn_cxx11_compat
) = 0;
203 CPP_OPTION (pfile
, cpp_warn_deprecated
) = 1;
204 CPP_OPTION (pfile
, cpp_warn_long_long
) = 0;
205 CPP_OPTION (pfile
, dollars_in_ident
) = 1;
206 CPP_OPTION (pfile
, warn_dollars
) = 1;
207 CPP_OPTION (pfile
, warn_variadic_macros
) = 1;
208 CPP_OPTION (pfile
, warn_builtin_macro_redefined
) = 1;
209 CPP_OPTION (pfile
, cpp_warn_implicit_fallthrough
) = 0;
210 /* By default, track locations of tokens resulting from macro
211 expansion. The '2' means, track the locations with the highest
212 accuracy. Read the comments for struct
213 cpp_options::track_macro_expansion to learn about the other
215 CPP_OPTION (pfile
, track_macro_expansion
) = 2;
216 CPP_OPTION (pfile
, warn_normalize
) = normalized_C
;
217 CPP_OPTION (pfile
, warn_literal_suffix
) = 1;
218 CPP_OPTION (pfile
, canonical_system_headers
)
219 = ENABLE_CANONICAL_SYSTEM_HEADERS
;
220 CPP_OPTION (pfile
, ext_numeric_literals
) = 1;
221 CPP_OPTION (pfile
, warn_date_time
) = 0;
223 /* Default CPP arithmetic to something sensible for the host for the
224 benefit of dumb users like fix-header. */
225 CPP_OPTION (pfile
, precision
) = CHAR_BIT
* sizeof (long);
226 CPP_OPTION (pfile
, char_precision
) = CHAR_BIT
;
227 CPP_OPTION (pfile
, wchar_precision
) = CHAR_BIT
* sizeof (int);
228 CPP_OPTION (pfile
, int_precision
) = CHAR_BIT
* sizeof (int);
229 CPP_OPTION (pfile
, unsigned_char
) = 0;
230 CPP_OPTION (pfile
, unsigned_wchar
) = 1;
231 CPP_OPTION (pfile
, bytes_big_endian
) = 1; /* does not matter */
233 /* Default to no charset conversion. */
234 CPP_OPTION (pfile
, narrow_charset
) = _cpp_default_encoding ();
235 CPP_OPTION (pfile
, wide_charset
) = 0;
237 /* Default the input character set to UTF-8. */
238 CPP_OPTION (pfile
, input_charset
) = _cpp_default_encoding ();
240 /* A fake empty "directory" used as the starting point for files
241 looked up without a search path. Name cannot be '/' because we
242 don't want to prepend anything at all to filenames using it. All
243 other entries are correct zero-initialized. */
244 pfile
->no_search_path
.name
= (char *) "";
246 /* Initialize the line map. */
247 pfile
->line_table
= line_table
;
249 /* Initialize lexer state. */
250 pfile
->state
.save_comments
= ! CPP_OPTION (pfile
, discard_comments
);
252 /* Set up static tokens. */
253 pfile
->avoid_paste
.type
= CPP_PADDING
;
254 pfile
->avoid_paste
.val
.source
= NULL
;
255 pfile
->avoid_paste
.src_loc
= 0;
256 pfile
->endarg
.type
= CPP_EOF
;
257 pfile
->endarg
.flags
= 0;
258 pfile
->endarg
.src_loc
= 0;
260 /* Create a token buffer for the lexer. */
261 _cpp_init_tokenrun (&pfile
->base_run
, 250);
262 pfile
->cur_run
= &pfile
->base_run
;
263 pfile
->cur_token
= pfile
->base_run
.base
;
265 /* Initialize the base context. */
266 pfile
->context
= &pfile
->base_context
;
267 pfile
->base_context
.c
.macro
= 0;
268 pfile
->base_context
.prev
= pfile
->base_context
.next
= 0;
270 /* Aligned and unaligned storage. */
271 pfile
->a_buff
= _cpp_get_buff (pfile
, 0);
272 pfile
->u_buff
= _cpp_get_buff (pfile
, 0);
274 /* Initialize table for push_macro/pop_macro. */
275 pfile
->pushed_macros
= 0;
277 /* Do not force token locations by default. */
278 pfile
->forced_token_location
= 0;
280 /* Note the timestamp is unset. */
281 pfile
->time_stamp
= time_t (-1);
282 pfile
->time_stamp_kind
= 0;
284 /* The expression parser stack. */
285 _cpp_expand_op_stack (pfile
);
287 /* Initialize the buffer obstack. */
288 obstack_specify_allocation (&pfile
->buffer_ob
, 0, 0, xmalloc
, free
);
290 _cpp_init_files (pfile
);
292 _cpp_init_hashtable (pfile
, table
);
297 /* Set the line_table entry in PFILE. This is called after reading a
298 PCH file, as the old line_table will be incorrect. */
300 cpp_set_line_map (cpp_reader
*pfile
, class line_maps
*line_table
)
302 pfile
->line_table
= line_table
;
305 /* Free resources used by PFILE. Accessing PFILE after this function
306 returns leads to undefined behavior. Returns the error count. */
308 cpp_destroy (cpp_reader
*pfile
)
310 cpp_context
*context
, *contextn
;
311 struct def_pragma_macro
*pmacro
;
312 tokenrun
*run
, *runn
;
315 free (pfile
->op_stack
);
317 while (CPP_BUFFER (pfile
) != NULL
)
318 _cpp_pop_buffer (pfile
);
320 free (pfile
->out
.base
);
322 if (pfile
->macro_buffer
)
324 free (pfile
->macro_buffer
);
325 pfile
->macro_buffer
= NULL
;
326 pfile
->macro_buffer_len
= 0;
330 deps_free (pfile
->deps
);
331 obstack_free (&pfile
->buffer_ob
, 0);
333 _cpp_destroy_hashtable (pfile
);
334 _cpp_cleanup_files (pfile
);
335 _cpp_destroy_iconv (pfile
);
337 _cpp_free_buff (pfile
->a_buff
);
338 _cpp_free_buff (pfile
->u_buff
);
339 _cpp_free_buff (pfile
->free_buffs
);
341 for (run
= &pfile
->base_run
; run
; run
= runn
)
345 if (run
!= &pfile
->base_run
)
349 for (context
= pfile
->base_context
.next
; context
; context
= contextn
)
351 contextn
= context
->next
;
355 if (pfile
->comments
.entries
)
357 for (i
= 0; i
< pfile
->comments
.count
; i
++)
358 free (pfile
->comments
.entries
[i
].comment
);
360 free (pfile
->comments
.entries
);
362 if (pfile
->pushed_macros
)
366 pmacro
= pfile
->pushed_macros
;
367 pfile
->pushed_macros
= pmacro
->next
;
371 while (pfile
->pushed_macros
);
377 /* This structure defines one built-in identifier. A node will be
378 entered in the hash table under the name NAME, with value VALUE.
380 There are two tables of these. builtin_array holds all the
381 "builtin" macros: these are handled by builtin_macro() in
382 macro.c. Builtin is somewhat of a misnomer -- the property of
383 interest is that these macros require special code to compute their
384 expansions. The value is a "cpp_builtin_type" enumerator.
386 operator_array holds the C++ named operators. These are keywords
387 which act as aliases for punctuators. In C++, they cannot be
388 altered through #define, and #if recognizes them as operators. In
389 C, these are not entered into the hash table at all (but see
390 <iso646.h>). The value is a token-type enumerator. */
393 const uchar
*const name
;
394 const unsigned short len
;
395 const unsigned short value
;
396 const bool always_warn_if_redefined
;
399 #define B(n, t, f) { DSC(n), t, f }
400 static const struct builtin_macro builtin_array
[] =
402 B("__TIMESTAMP__", BT_TIMESTAMP
, false),
403 B("__TIME__", BT_TIME
, false),
404 B("__DATE__", BT_DATE
, false),
405 B("__FILE__", BT_FILE
, false),
406 B("__BASE_FILE__", BT_BASE_FILE
, false),
407 B("__LINE__", BT_SPECLINE
, true),
408 B("__INCLUDE_LEVEL__", BT_INCLUDE_LEVEL
, true),
409 B("__COUNTER__", BT_COUNTER
, true),
410 /* Make sure to update the list of built-in
411 function-like macros in traditional.c:
412 fun_like_macro() when adding more following */
413 B("__has_attribute", BT_HAS_ATTRIBUTE
, true),
414 B("__has_c_attribute", BT_HAS_STD_ATTRIBUTE
, true),
415 B("__has_cpp_attribute", BT_HAS_ATTRIBUTE
, true),
416 B("__has_builtin", BT_HAS_BUILTIN
, true),
417 B("__has_include", BT_HAS_INCLUDE
, true),
418 B("__has_include_next",BT_HAS_INCLUDE_NEXT
, true),
419 /* Keep builtins not used for -traditional-cpp at the end, and
420 update init_builtins() if any more are added. */
421 B("_Pragma", BT_PRAGMA
, true),
422 B("__STDC__", BT_STDC
, true),
426 struct builtin_operator
428 const uchar
*const name
;
429 const unsigned short len
;
430 const unsigned short value
;
433 #define B(n, t) { DSC(n), t }
434 static const struct builtin_operator operator_array
[] =
436 B("and", CPP_AND_AND
),
437 B("and_eq", CPP_AND_EQ
),
438 B("bitand", CPP_AND
),
440 B("compl", CPP_COMPL
),
442 B("not_eq", CPP_NOT_EQ
),
444 B("or_eq", CPP_OR_EQ
),
446 B("xor_eq", CPP_XOR_EQ
)
450 /* Mark the C++ named operators in the hash table. */
452 mark_named_operators (cpp_reader
*pfile
, int flags
)
454 const struct builtin_operator
*b
;
456 for (b
= operator_array
;
457 b
< (operator_array
+ ARRAY_SIZE (operator_array
));
460 cpp_hashnode
*hp
= cpp_lookup (pfile
, b
->name
, b
->len
);
462 hp
->is_directive
= 0;
463 hp
->directive_index
= b
->value
;
467 /* Helper function of cpp_type2name. Return the string associated with
468 named operator TYPE. */
470 cpp_named_operator2name (enum cpp_ttype type
)
472 const struct builtin_operator
*b
;
474 for (b
= operator_array
;
475 b
< (operator_array
+ ARRAY_SIZE (operator_array
));
478 if (type
== b
->value
)
479 return (const char *) b
->name
;
486 cpp_init_special_builtins (cpp_reader
*pfile
)
488 const struct builtin_macro
*b
;
489 size_t n
= ARRAY_SIZE (builtin_array
);
491 if (CPP_OPTION (pfile
, traditional
))
493 else if (! CPP_OPTION (pfile
, stdc_0_in_system_headers
)
494 || CPP_OPTION (pfile
, std
))
497 for (b
= builtin_array
; b
< builtin_array
+ n
; b
++)
499 if ((b
->value
== BT_HAS_ATTRIBUTE
500 || b
->value
== BT_HAS_STD_ATTRIBUTE
501 || b
->value
== BT_HAS_BUILTIN
)
502 && (CPP_OPTION (pfile
, lang
) == CLK_ASM
503 || pfile
->cb
.has_attribute
== NULL
))
505 cpp_hashnode
*hp
= cpp_lookup (pfile
, b
->name
, b
->len
);
506 hp
->type
= NT_BUILTIN_MACRO
;
507 if (b
->always_warn_if_redefined
)
508 hp
->flags
|= NODE_WARN
;
509 hp
->value
.builtin
= (enum cpp_builtin_type
) b
->value
;
513 /* Restore macro C to builtin macro definition. */
516 _cpp_restore_special_builtin (cpp_reader
*pfile
, struct def_pragma_macro
*c
)
518 size_t len
= strlen (c
->name
);
520 for (const struct builtin_macro
*b
= builtin_array
;
521 b
< builtin_array
+ ARRAY_SIZE (builtin_array
); b
++)
522 if (b
->len
== len
&& memcmp (c
->name
, b
->name
, len
+ 1) == 0)
524 cpp_hashnode
*hp
= cpp_lookup (pfile
, b
->name
, b
->len
);
525 hp
->type
= NT_BUILTIN_MACRO
;
526 if (b
->always_warn_if_redefined
)
527 hp
->flags
|= NODE_WARN
;
528 hp
->value
.builtin
= (enum cpp_builtin_type
) b
->value
;
532 /* Read the builtins table above and enter them, and language-specific
533 macros, into the hash table. HOSTED is true if this is a hosted
536 cpp_init_builtins (cpp_reader
*pfile
, int hosted
)
538 cpp_init_special_builtins (pfile
);
540 if (!CPP_OPTION (pfile
, traditional
)
541 && (! CPP_OPTION (pfile
, stdc_0_in_system_headers
)
542 || CPP_OPTION (pfile
, std
)))
543 _cpp_define_builtin (pfile
, "__STDC__ 1");
545 if (CPP_OPTION (pfile
, cplusplus
))
547 /* C++23 is not yet a standard. For now, use an invalid
548 * year/month, 202100L, which is larger than 202002L. */
549 if (CPP_OPTION (pfile
, lang
) == CLK_CXX23
550 || CPP_OPTION (pfile
, lang
) == CLK_GNUCXX23
)
551 _cpp_define_builtin (pfile
, "__cplusplus 202100L");
552 else if (CPP_OPTION (pfile
, lang
) == CLK_CXX20
553 || CPP_OPTION (pfile
, lang
) == CLK_GNUCXX20
)
554 _cpp_define_builtin (pfile
, "__cplusplus 202002L");
555 else if (CPP_OPTION (pfile
, lang
) == CLK_CXX17
556 || CPP_OPTION (pfile
, lang
) == CLK_GNUCXX17
)
557 _cpp_define_builtin (pfile
, "__cplusplus 201703L");
558 else if (CPP_OPTION (pfile
, lang
) == CLK_CXX14
559 || CPP_OPTION (pfile
, lang
) == CLK_GNUCXX14
)
560 _cpp_define_builtin (pfile
, "__cplusplus 201402L");
561 else if (CPP_OPTION (pfile
, lang
) == CLK_CXX11
562 || CPP_OPTION (pfile
, lang
) == CLK_GNUCXX11
)
563 _cpp_define_builtin (pfile
, "__cplusplus 201103L");
565 _cpp_define_builtin (pfile
, "__cplusplus 199711L");
567 else if (CPP_OPTION (pfile
, lang
) == CLK_ASM
)
568 _cpp_define_builtin (pfile
, "__ASSEMBLER__ 1");
569 else if (CPP_OPTION (pfile
, lang
) == CLK_STDC94
)
570 _cpp_define_builtin (pfile
, "__STDC_VERSION__ 199409L");
571 else if (CPP_OPTION (pfile
, lang
) == CLK_STDC2X
572 || CPP_OPTION (pfile
, lang
) == CLK_GNUC2X
)
573 _cpp_define_builtin (pfile
, "__STDC_VERSION__ 202000L");
574 else if (CPP_OPTION (pfile
, lang
) == CLK_STDC17
575 || CPP_OPTION (pfile
, lang
) == CLK_GNUC17
)
576 _cpp_define_builtin (pfile
, "__STDC_VERSION__ 201710L");
577 else if (CPP_OPTION (pfile
, lang
) == CLK_STDC11
578 || CPP_OPTION (pfile
, lang
) == CLK_GNUC11
)
579 _cpp_define_builtin (pfile
, "__STDC_VERSION__ 201112L");
580 else if (CPP_OPTION (pfile
, c99
))
581 _cpp_define_builtin (pfile
, "__STDC_VERSION__ 199901L");
583 if (CPP_OPTION (pfile
, uliterals
)
584 && !(CPP_OPTION (pfile
, cplusplus
)
585 && (CPP_OPTION (pfile
, lang
) == CLK_GNUCXX
586 || CPP_OPTION (pfile
, lang
) == CLK_CXX98
)))
588 _cpp_define_builtin (pfile
, "__STDC_UTF_16__ 1");
589 _cpp_define_builtin (pfile
, "__STDC_UTF_32__ 1");
593 _cpp_define_builtin (pfile
, "__STDC_HOSTED__ 1");
595 _cpp_define_builtin (pfile
, "__STDC_HOSTED__ 0");
597 if (CPP_OPTION (pfile
, objc
))
598 _cpp_define_builtin (pfile
, "__OBJC__ 1");
601 /* Sanity-checks are dependent on command-line options, so it is
602 called as a subroutine of cpp_read_main_file. */
604 static void sanity_checks (cpp_reader
*);
605 static void sanity_checks (cpp_reader
*pfile
)
608 size_t max_precision
= 2 * CHAR_BIT
* sizeof (cpp_num_part
);
610 /* Sanity checks for assumptions about CPP arithmetic and target
611 type precisions made by cpplib. */
614 cpp_error (pfile
, CPP_DL_ICE
, "cppchar_t must be an unsigned type");
616 if (CPP_OPTION (pfile
, precision
) > max_precision
)
617 cpp_error (pfile
, CPP_DL_ICE
,
618 "preprocessor arithmetic has maximum precision of %lu bits;"
619 " target requires %lu bits",
620 (unsigned long) max_precision
,
621 (unsigned long) CPP_OPTION (pfile
, precision
));
623 if (CPP_OPTION (pfile
, precision
) < CPP_OPTION (pfile
, int_precision
))
624 cpp_error (pfile
, CPP_DL_ICE
,
625 "CPP arithmetic must be at least as precise as a target int");
627 if (CPP_OPTION (pfile
, char_precision
) < 8)
628 cpp_error (pfile
, CPP_DL_ICE
, "target char is less than 8 bits wide");
630 if (CPP_OPTION (pfile
, wchar_precision
) < CPP_OPTION (pfile
, char_precision
))
631 cpp_error (pfile
, CPP_DL_ICE
,
632 "target wchar_t is narrower than target char");
634 if (CPP_OPTION (pfile
, int_precision
) < CPP_OPTION (pfile
, char_precision
))
635 cpp_error (pfile
, CPP_DL_ICE
,
636 "target int is narrower than target char");
638 /* This is assumed in eval_token() and could be fixed if necessary. */
639 if (sizeof (cppchar_t
) > sizeof (cpp_num_part
))
640 cpp_error (pfile
, CPP_DL_ICE
,
641 "CPP half-integer narrower than CPP character");
643 if (CPP_OPTION (pfile
, wchar_precision
) > BITS_PER_CPPCHAR_T
)
644 cpp_error (pfile
, CPP_DL_ICE
,
645 "CPP on this host cannot handle wide character constants over"
646 " %lu bits, but the target requires %lu bits",
647 (unsigned long) BITS_PER_CPPCHAR_T
,
648 (unsigned long) CPP_OPTION (pfile
, wchar_precision
));
651 # define sanity_checks(PFILE)
654 /* This is called after options have been parsed, and partially
657 cpp_post_options (cpp_reader
*pfile
)
661 sanity_checks (pfile
);
663 post_options (pfile
);
665 /* Mark named operators before handling command line macros. */
667 if (CPP_OPTION (pfile
, cplusplus
) && CPP_OPTION (pfile
, operator_names
))
668 flags
|= NODE_OPERATOR
;
669 if (CPP_OPTION (pfile
, warn_cxx_operator_names
))
670 flags
|= NODE_DIAGNOSTIC
| NODE_WARN_OPERATOR
;
672 mark_named_operators (pfile
, flags
);
675 /* Setup for processing input from the file named FNAME, or stdin if
676 it is the empty string. Return the original filename on success
677 (e.g. foo.i->foo.c), or NULL on failure. INJECTING is true if
678 there may be injected headers before line 1 of the main file. */
680 cpp_read_main_file (cpp_reader
*pfile
, const char *fname
, bool injecting
)
682 if (mkdeps
*deps
= cpp_get_deps (pfile
))
683 /* Set the default target (if there is none already). */
684 deps_add_default_target (deps
, fname
);
687 = _cpp_find_file (pfile
, fname
,
688 CPP_OPTION (pfile
, preprocessed
) ? &pfile
->no_search_path
689 : CPP_OPTION (pfile
, main_search
) == CMS_user
690 ? pfile
->quote_include
691 : CPP_OPTION (pfile
, main_search
) == CMS_system
692 ? pfile
->bracket_include
: &pfile
->no_search_path
,
693 /*angle=*/0, _cpp_FFK_NORMAL
, 0);
695 if (_cpp_find_failed (pfile
->main_file
))
698 _cpp_stack_file (pfile
, pfile
->main_file
,
699 injecting
|| CPP_OPTION (pfile
, preprocessed
)
700 ? IT_PRE_MAIN
: IT_MAIN
, 0);
702 /* For foo.i, read the original filename foo.c now, for the benefit
703 of the front ends. */
704 if (CPP_OPTION (pfile
, preprocessed
))
705 if (!read_original_filename (pfile
))
707 /* We're on line 1 after all. */
708 auto *last
= linemap_check_ordinary
709 (LINEMAPS_LAST_MAP (pfile
->line_table
, false));
711 /* Inform of as-if a file change. */
712 _cpp_do_file_change (pfile
, LC_RENAME_VERBATIM
, LINEMAP_FILE (last
),
713 LINEMAP_LINE (last
), LINEMAP_SYSP (last
));
716 auto *map
= LINEMAPS_LAST_ORDINARY_MAP (pfile
->line_table
);
717 pfile
->main_loc
= MAP_START_LOCATION (map
);
719 return ORDINARY_MAP_FILE_NAME (map
);
723 cpp_main_loc (const cpp_reader
*pfile
)
725 return pfile
->main_loc
;
728 /* For preprocessed files, if the very first characters are
729 '#<SPACE>[01]<SPACE>', then handle a line directive so we know the
730 original file name. This will generate file_change callbacks,
731 which the front ends must handle appropriately given their state of
732 initialization. We peek directly into the character buffer, so
733 that we're not confused by otherwise-skipped white space &
734 comments. We can be very picky, because this should have been
735 machine-generated text (by us, no less). This way we do not
736 interfere with the module directive state machine. */
739 read_original_filename (cpp_reader
*pfile
)
741 auto *buf
= pfile
->buffer
->next_line
;
743 if (pfile
->buffer
->rlimit
- buf
> 4
746 // Also permit '1', as that's what used to be here
747 && (buf
[2] == '0' || buf
[2] == '1')
750 const cpp_token
*token
= _cpp_lex_direct (pfile
);
751 gcc_checking_assert (token
->type
== CPP_HASH
);
752 if (_cpp_handle_directive (pfile
, token
->flags
& PREV_WHITE
))
754 read_original_directory (pfile
);
762 /* For preprocessed files, if the tokens following the first filename
763 line is of the form # <line> "/path/name//", handle the
764 directive so we know the original current directory.
766 As with the first line peeking, we can do this without lexing by
769 read_original_directory (cpp_reader
*pfile
)
771 auto *buf
= pfile
->buffer
->next_line
;
773 if (pfile
->buffer
->rlimit
- buf
> 4
776 // Also permit '1', as that's what used to be here
777 && (buf
[2] == '0' || buf
[2] == '1')
780 const cpp_token
*hash
= _cpp_lex_direct (pfile
);
781 gcc_checking_assert (hash
->type
== CPP_HASH
);
782 pfile
->state
.in_directive
= 1;
783 const cpp_token
*number
= _cpp_lex_direct (pfile
);
784 gcc_checking_assert (number
->type
== CPP_NUMBER
);
785 const cpp_token
*string
= _cpp_lex_direct (pfile
);
786 pfile
->state
.in_directive
= 0;
788 const unsigned char *text
= nullptr;
790 if (string
->type
== CPP_STRING
)
792 /* The string value includes the quotes. */
793 text
= string
->val
.str
.text
;
794 len
= string
->val
.str
.len
;
797 || !IS_DIR_SEPARATOR (text
[len
- 2])
798 || !IS_DIR_SEPARATOR (text
[len
- 3]))
800 /* That didn't work out, back out. */
801 _cpp_backup_tokens (pfile
, 3);
805 if (pfile
->cb
.dir_change
)
807 /* Smash the string directly, it's dead at this point */
808 char *smashy
= (char *)text
;
811 pfile
->cb
.dir_change (pfile
, smashy
+ 1);
814 /* We should be at EOL. */
818 /* This is called at the end of preprocessing. It pops the last
819 buffer and writes dependency output.
821 Maybe it should also reset state, such that you could call
822 cpp_start_read with a new filename to restart processing. */
824 cpp_finish (cpp_reader
*pfile
, FILE *deps_stream
)
826 /* Warn about unused macros before popping the final buffer. */
827 if (CPP_OPTION (pfile
, warn_unused_macros
))
828 cpp_forall_identifiers (pfile
, _cpp_warn_if_unused_macro
, NULL
);
830 /* lex.c leaves the final buffer on the stack. This it so that
831 it returns an unending stream of CPP_EOFs to the client. If we
832 popped the buffer, we'd dereference a NULL buffer pointer and
833 segfault. It's nice to allow the client to do worry-free excess
834 cpp_get_token calls. */
835 while (pfile
->buffer
)
836 _cpp_pop_buffer (pfile
);
839 deps_write (pfile
, deps_stream
, 72);
841 /* Report on headers that could use multiple include guards. */
842 if (CPP_OPTION (pfile
, print_include_names
))
843 _cpp_report_missing_guards (pfile
);
847 post_options (cpp_reader
*pfile
)
849 /* -Wtraditional is not useful in C++ mode. */
850 if (CPP_OPTION (pfile
, cplusplus
))
851 CPP_OPTION (pfile
, cpp_warn_traditional
) = 0;
853 /* Permanently disable macro expansion if we are rescanning
854 preprocessed text. Read preprocesed source in ISO mode. */
855 if (CPP_OPTION (pfile
, preprocessed
))
857 if (!CPP_OPTION (pfile
, directives_only
))
858 pfile
->state
.prevent_expansion
= 1;
859 CPP_OPTION (pfile
, traditional
) = 0;
862 if (CPP_OPTION (pfile
, warn_trigraphs
) == 2)
863 CPP_OPTION (pfile
, warn_trigraphs
) = !CPP_OPTION (pfile
, trigraphs
);
865 if (CPP_OPTION (pfile
, traditional
))
867 CPP_OPTION (pfile
, trigraphs
) = 0;
868 CPP_OPTION (pfile
, warn_trigraphs
) = 0;
871 if (CPP_OPTION (pfile
, module_directives
))
873 /* These unspellable tokens have a leading space. */
874 const char *const inits
[spec_nodes::M_HWM
]
875 = {"export ", "module ", "import ", "__import"};
877 for (int ix
= 0; ix
!= spec_nodes::M_HWM
; ix
++)
879 cpp_hashnode
*node
= cpp_lookup (pfile
, UC (inits
[ix
]),
882 /* Token we pass to the compiler. */
883 pfile
->spec_nodes
.n_modules
[ix
][1] = node
;
885 if (ix
!= spec_nodes::M__IMPORT
)
886 /* Token we recognize when lexing, drop the trailing ' '. */
887 node
= cpp_lookup (pfile
, NODE_NAME (node
), NODE_LEN (node
) - 1);
889 node
->flags
|= NODE_MODULE
;
890 pfile
->spec_nodes
.n_modules
[ix
][0] = node
;