1 /* CPP Library.
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
6
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
10 later version.
11
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.
16
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/>. */
20
21 #include "config.h"
22 #include "system.h"
23 #include "cpplib.h"
24 #include "internal.h"
25 #include "mkdeps.h"
26 #include "localedir.h"
27 #include "filenames.h"
28
29 #ifndef ENABLE_CANONICAL_SYSTEM_HEADERS
30 #ifdef HAVE_DOS_BASED_FILE_SYSTEM
31 #define ENABLE_CANONICAL_SYSTEM_HEADERS 1
32 #else
33 #define ENABLE_CANONICAL_SYSTEM_HEADERS 0
34 #endif
35 #endif
36
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 *);
42
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
45 runtime. */
46 #if HAVE_DESIGNATED_INITIALIZERS
47
48 #define init_trigraph_map() /* Nothing. */
49 #define TRIGRAPH_MAP \
50 __extension__ const uchar _cpp_trigraph_map[UCHAR_MAX + 1] = {
51
52 #define END };
53 #define s(p, v) [p] = v,
54
55 #else
56
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;
60
61 #define END }
62 #define s(p, v) x[p] = v;
63
64 #endif
65
66 TRIGRAPH_MAP
67 s('=', '#') s(')', ']') s('!', '|')
68 s('(', '[') s('\'', '^') s('>', '}')
69 s('/', '\\') s('<', '{') s('-', '~')
70 END
71
72 #undef s
73 #undef END
74 #undef TRIGRAPH_MAP
75
76 /* A set of booleans indicating what CPP features each source language
77 requires. */
78 struct lang_flags
79 {
80 char c99;
81 char cplusplus;
82 char extended_numbers;
83 char extended_identifiers;
84 char c11_identifiers;
85 char std;
86 char digraphs;
87 char uliterals;
88 char rliterals;
89 char user_literals;
90 char binary_constants;
91 char digit_separators;
92 char trigraphs;
93 char utf8_char_literals;
94 char va_opt;
95 char scope;
96 char dfp_constants;
97 char size_t_literals;
98 char elifdef;
99 };
100
101 static const struct lang_flags lang_defaults[] =
102 { /* c99 c++ xnum xid c11 std digr ulit rlit udlit bincst digsep trig u8chlit vaopt scope dfp szlit elifdef */
103 /* GNUC89 */ { 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0 },
104 /* GNUC99 */ { 1, 0, 1, 1, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0 },
105 /* GNUC11 */ { 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0 },
106 /* GNUC17 */ { 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0 },
107 /* GNUC2X */ { 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 0, 1, 1, 1, 1, 0, 1 },
108 /* STDC89 */ { 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0 },
109 /* STDC94 */ { 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0 },
110 /* STDC99 */ { 1, 0, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0 },
111 /* STDC11 */ { 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0 },
112 /* STDC17 */ { 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0 },
113 /* STDC2X */ { 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 0, 1, 1, 0, 1 },
114 /* GNUCXX */ { 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0 },
115 /* CXX98 */ { 0, 1, 0, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0 },
116 /* GNUCXX11 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0, 0 },
117 /* CXX11 */ { 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 0, 1, 0, 0, 0 },
118 /* GNUCXX14 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 0, 0 },
119 /* CXX14 */ { 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 0, 0 },
120 /* GNUCXX17 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0 },
121 /* CXX17 */ { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0, 0, 0 },
122 /* GNUCXX20 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0 },
123 /* CXX20 */ { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0 },
124 /* GNUCXX23 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1 },
125 /* CXX23 */ { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1 },
126 /* ASM */ { 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
127 };
128
129 /* Sets internal flags correctly for a given language. */
130 void
cpp_set_lang(cpp_reader * pfile,enum c_lang lang)131 cpp_set_lang (cpp_reader *pfile, enum c_lang lang)
132 {
133 const struct lang_flags *l = &lang_defaults[(int) lang];
134
135 CPP_OPTION (pfile, lang) = lang;
136
137 CPP_OPTION (pfile, c99) = l->c99;
138 CPP_OPTION (pfile, cplusplus) = l->cplusplus;
139 CPP_OPTION (pfile, extended_numbers) = l->extended_numbers;
140 CPP_OPTION (pfile, extended_identifiers) = l->extended_identifiers;
141 CPP_OPTION (pfile, c11_identifiers) = l->c11_identifiers;
142 CPP_OPTION (pfile, std) = l->std;
143 CPP_OPTION (pfile, digraphs) = l->digraphs;
144 CPP_OPTION (pfile, uliterals) = l->uliterals;
145 CPP_OPTION (pfile, rliterals) = l->rliterals;
146 CPP_OPTION (pfile, user_literals) = l->user_literals;
147 CPP_OPTION (pfile, binary_constants) = l->binary_constants;
148 CPP_OPTION (pfile, digit_separators) = l->digit_separators;
149 CPP_OPTION (pfile, trigraphs) = l->trigraphs;
150 CPP_OPTION (pfile, utf8_char_literals) = l->utf8_char_literals;
151 CPP_OPTION (pfile, va_opt) = l->va_opt;
152 CPP_OPTION (pfile, scope) = l->scope;
153 CPP_OPTION (pfile, dfp_constants) = l->dfp_constants;
154 CPP_OPTION (pfile, size_t_literals) = l->size_t_literals;
155 CPP_OPTION (pfile, elifdef) = l->elifdef;
156 }
157
158 /* Initialize library global state. */
159 static void
init_library(void)160 init_library (void)
161 {
162 static int initialized = 0;
163
164 if (! initialized)
165 {
166 initialized = 1;
167
168 _cpp_init_lexer ();
169
170 /* Set up the trigraph map. This doesn't need to do anything if
171 we were compiled with a compiler that supports C99 designated
172 initializers. */
173 init_trigraph_map ();
174
175 #ifdef ENABLE_NLS
176 (void) bindtextdomain (PACKAGE, LOCALEDIR);
177 #endif
178 }
179 }
180
181 /* Initialize a cpp_reader structure. */
182 cpp_reader *
cpp_create_reader(enum c_lang lang,cpp_hash_table * table,class line_maps * line_table)183 cpp_create_reader (enum c_lang lang, cpp_hash_table *table,
184 class line_maps *line_table)
185 {
186 cpp_reader *pfile;
187
188 /* Initialize this instance of the library if it hasn't been already. */
189 init_library ();
190
191 pfile = XCNEW (cpp_reader);
192 memset (&pfile->base_context, 0, sizeof (pfile->base_context));
193
194 cpp_set_lang (pfile, lang);
195 CPP_OPTION (pfile, warn_multichar) = 1;
196 CPP_OPTION (pfile, discard_comments) = 1;
197 CPP_OPTION (pfile, discard_comments_in_macro_exp) = 1;
198 CPP_OPTION (pfile, max_include_depth) = 200;
199 CPP_OPTION (pfile, operator_names) = 1;
200 CPP_OPTION (pfile, warn_trigraphs) = 2;
201 CPP_OPTION (pfile, warn_endif_labels) = 1;
202 CPP_OPTION (pfile, cpp_warn_c90_c99_compat) = -1;
203 CPP_OPTION (pfile, cpp_warn_c11_c2x_compat) = -1;
204 CPP_OPTION (pfile, cpp_warn_cxx11_compat) = 0;
205 CPP_OPTION (pfile, cpp_warn_deprecated) = 1;
206 CPP_OPTION (pfile, cpp_warn_long_long) = 0;
207 CPP_OPTION (pfile, dollars_in_ident) = 1;
208 CPP_OPTION (pfile, warn_dollars) = 1;
209 CPP_OPTION (pfile, warn_variadic_macros) = 1;
210 CPP_OPTION (pfile, warn_builtin_macro_redefined) = 1;
211 CPP_OPTION (pfile, cpp_warn_implicit_fallthrough) = 0;
212 /* By default, track locations of tokens resulting from macro
213 expansion. The '2' means, track the locations with the highest
214 accuracy. Read the comments for struct
215 cpp_options::track_macro_expansion to learn about the other
216 values. */
217 CPP_OPTION (pfile, track_macro_expansion) = 2;
218 CPP_OPTION (pfile, warn_normalize) = normalized_C;
219 CPP_OPTION (pfile, warn_literal_suffix) = 1;
220 CPP_OPTION (pfile, canonical_system_headers)
221 = ENABLE_CANONICAL_SYSTEM_HEADERS;
222 CPP_OPTION (pfile, ext_numeric_literals) = 1;
223 CPP_OPTION (pfile, warn_date_time) = 0;
224 CPP_OPTION (pfile, cpp_warn_bidirectional) = bidirectional_unpaired;
225
226 /* Default CPP arithmetic to something sensible for the host for the
227 benefit of dumb users like fix-header. */
228 CPP_OPTION (pfile, precision) = CHAR_BIT * sizeof (long);
229 CPP_OPTION (pfile, char_precision) = CHAR_BIT;
230 CPP_OPTION (pfile, wchar_precision) = CHAR_BIT * sizeof (int);
231 CPP_OPTION (pfile, int_precision) = CHAR_BIT * sizeof (int);
232 CPP_OPTION (pfile, unsigned_char) = 0;
233 CPP_OPTION (pfile, unsigned_wchar) = 1;
234 CPP_OPTION (pfile, bytes_big_endian) = 1; /* does not matter */
235
236 /* Default to no charset conversion. */
237 CPP_OPTION (pfile, narrow_charset) = _cpp_default_encoding ();
238 CPP_OPTION (pfile, wide_charset) = 0;
239
240 /* Default the input character set to UTF-8. */
241 CPP_OPTION (pfile, input_charset) = _cpp_default_encoding ();
242
243 /* A fake empty "directory" used as the starting point for files
244 looked up without a search path. Name cannot be '/' because we
245 don't want to prepend anything at all to filenames using it. All
246 other entries are correct zero-initialized. */
247 pfile->no_search_path.name = (char *) "";
248
249 /* Initialize the line map. */
250 pfile->line_table = line_table;
251
252 /* Initialize lexer state. */
253 pfile->state.save_comments = ! CPP_OPTION (pfile, discard_comments);
254
255 /* Set up static tokens. */
256 pfile->avoid_paste.type = CPP_PADDING;
257 pfile->avoid_paste.val.source = NULL;
258 pfile->avoid_paste.src_loc = 0;
259 pfile->endarg.type = CPP_EOF;
260 pfile->endarg.flags = 0;
261 pfile->endarg.src_loc = 0;
262
263 /* Create a token buffer for the lexer. */
264 _cpp_init_tokenrun (&pfile->base_run, 250);
265 pfile->cur_run = &pfile->base_run;
266 pfile->cur_token = pfile->base_run.base;
267
268 /* Initialize the base context. */
269 pfile->context = &pfile->base_context;
270 pfile->base_context.c.macro = 0;
271 pfile->base_context.prev = pfile->base_context.next = 0;
272
273 /* Aligned and unaligned storage. */
274 pfile->a_buff = _cpp_get_buff (pfile, 0);
275 pfile->u_buff = _cpp_get_buff (pfile, 0);
276
277 /* Initialize table for push_macro/pop_macro. */
278 pfile->pushed_macros = 0;
279
280 /* Do not force token locations by default. */
281 pfile->forced_token_location = 0;
282
283 /* Note the timestamp is unset. */
284 pfile->time_stamp = time_t (-1);
285 pfile->time_stamp_kind = 0;
286
287 /* The expression parser stack. */
288 _cpp_expand_op_stack (pfile);
289
290 /* Initialize the buffer obstack. */
291 obstack_specify_allocation (&pfile->buffer_ob, 0, 0, xmalloc, free);
292
293 _cpp_init_files (pfile);
294
295 _cpp_init_hashtable (pfile, table);
296
297 return pfile;
298 }
299
300 /* Set the line_table entry in PFILE. This is called after reading a
301 PCH file, as the old line_table will be incorrect. */
302 void
cpp_set_line_map(cpp_reader * pfile,class line_maps * line_table)303 cpp_set_line_map (cpp_reader *pfile, class line_maps *line_table)
304 {
305 pfile->line_table = line_table;
306 }
307
308 /* Free resources used by PFILE. Accessing PFILE after this function
309 returns leads to undefined behavior. Returns the error count. */
310 void
cpp_destroy(cpp_reader * pfile)311 cpp_destroy (cpp_reader *pfile)
312 {
313 cpp_context *context, *contextn;
314 struct def_pragma_macro *pmacro;
315 tokenrun *run, *runn;
316 int i;
317
318 free (pfile->op_stack);
319
320 while (CPP_BUFFER (pfile) != NULL)
321 _cpp_pop_buffer (pfile);
322
323 free (pfile->out.base);
324
325 if (pfile->macro_buffer)
326 {
327 free (pfile->macro_buffer);
328 pfile->macro_buffer = NULL;
329 pfile->macro_buffer_len = 0;
330 }
331
332 if (pfile->deps)
333 deps_free (pfile->deps);
334 obstack_free (&pfile->buffer_ob, 0);
335
336 _cpp_destroy_hashtable (pfile);
337 _cpp_cleanup_files (pfile);
338 _cpp_destroy_iconv (pfile);
339
340 _cpp_free_buff (pfile->a_buff);
341 _cpp_free_buff (pfile->u_buff);
342 _cpp_free_buff (pfile->free_buffs);
343
344 for (run = &pfile->base_run; run; run = runn)
345 {
346 runn = run->next;
347 free (run->base);
348 if (run != &pfile->base_run)
349 free (run);
350 }
351
352 for (context = pfile->base_context.next; context; context = contextn)
353 {
354 contextn = context->next;
355 free (context);
356 }
357
358 if (pfile->comments.entries)
359 {
360 for (i = 0; i < pfile->comments.count; i++)
361 free (pfile->comments.entries[i].comment);
362
363 free (pfile->comments.entries);
364 }
365 if (pfile->pushed_macros)
366 {
367 do
368 {
369 pmacro = pfile->pushed_macros;
370 pfile->pushed_macros = pmacro->next;
371 free (pmacro->name);
372 free (pmacro);
373 }
374 while (pfile->pushed_macros);
375 }
376
377 free (pfile);
378 }
379
380 /* This structure defines one built-in identifier. A node will be
381 entered in the hash table under the name NAME, with value VALUE.
382
383 There are two tables of these. builtin_array holds all the
384 "builtin" macros: these are handled by builtin_macro() in
385 macro.cc. Builtin is somewhat of a misnomer -- the property of
386 interest is that these macros require special code to compute their
387 expansions. The value is a "cpp_builtin_type" enumerator.
388
389 operator_array holds the C++ named operators. These are keywords
390 which act as aliases for punctuators. In C++, they cannot be
391 altered through #define, and #if recognizes them as operators. In
392 C, these are not entered into the hash table at all (but see
393 <iso646.h>). The value is a token-type enumerator. */
394 struct builtin_macro
395 {
396 const uchar *const name;
397 const unsigned short len;
398 const unsigned short value;
399 const bool always_warn_if_redefined;
400 };
401
402 #define B(n, t, f) { DSC(n), t, f }
403 static const struct builtin_macro builtin_array[] =
404 {
405 B("__TIMESTAMP__", BT_TIMESTAMP, false),
406 B("__TIME__", BT_TIME, false),
407 B("__DATE__", BT_DATE, false),
408 B("__FILE__", BT_FILE, false),
409 B("__FILE_NAME__", BT_FILE_NAME, false),
410 B("__BASE_FILE__", BT_BASE_FILE, false),
411 B("__LINE__", BT_SPECLINE, true),
412 B("__INCLUDE_LEVEL__", BT_INCLUDE_LEVEL, true),
413 B("__COUNTER__", BT_COUNTER, true),
414 /* Make sure to update the list of built-in
415 function-like macros in traditional.cc:
416 fun_like_macro() when adding more following */
417 B("__has_attribute", BT_HAS_ATTRIBUTE, true),
418 B("__has_c_attribute", BT_HAS_STD_ATTRIBUTE, true),
419 B("__has_cpp_attribute", BT_HAS_ATTRIBUTE, true),
420 B("__has_builtin", BT_HAS_BUILTIN, true),
421 B("__has_include", BT_HAS_INCLUDE, true),
422 B("__has_include_next",BT_HAS_INCLUDE_NEXT, true),
423 /* Keep builtins not used for -traditional-cpp at the end, and
424 update init_builtins() if any more are added. */
425 B("_Pragma", BT_PRAGMA, true),
426 B("__STDC__", BT_STDC, true),
427 };
428 #undef B
429
430 struct builtin_operator
431 {
432 const uchar *const name;
433 const unsigned short len;
434 const unsigned short value;
435 };
436
437 #define B(n, t) { DSC(n), t }
438 static const struct builtin_operator operator_array[] =
439 {
440 B("and", CPP_AND_AND),
441 B("and_eq", CPP_AND_EQ),
442 B("bitand", CPP_AND),
443 B("bitor", CPP_OR),
444 B("compl", CPP_COMPL),
445 B("not", CPP_NOT),
446 B("not_eq", CPP_NOT_EQ),
447 B("or", CPP_OR_OR),
448 B("or_eq", CPP_OR_EQ),
449 B("xor", CPP_XOR),
450 B("xor_eq", CPP_XOR_EQ)
451 };
452 #undef B
453
454 /* Mark the C++ named operators in the hash table. */
455 static void
mark_named_operators(cpp_reader * pfile,int flags)456 mark_named_operators (cpp_reader *pfile, int flags)
457 {
458 const struct builtin_operator *b;
459
460 for (b = operator_array;
461 b < (operator_array + ARRAY_SIZE (operator_array));
462 b++)
463 {
464 cpp_hashnode *hp = cpp_lookup (pfile, b->name, b->len);
465 hp->flags |= flags;
466 hp->is_directive = 0;
467 hp->directive_index = b->value;
468 }
469 }
470
471 /* Helper function of cpp_type2name. Return the string associated with
472 named operator TYPE. */
473 const char *
cpp_named_operator2name(enum cpp_ttype type)474 cpp_named_operator2name (enum cpp_ttype type)
475 {
476 const struct builtin_operator *b;
477
478 for (b = operator_array;
479 b < (operator_array + ARRAY_SIZE (operator_array));
480 b++)
481 {
482 if (type == b->value)
483 return (const char *) b->name;
484 }
485
486 return NULL;
487 }
488
489 void
cpp_init_special_builtins(cpp_reader * pfile)490 cpp_init_special_builtins (cpp_reader *pfile)
491 {
492 const struct builtin_macro *b;
493 size_t n = ARRAY_SIZE (builtin_array);
494
495 if (CPP_OPTION (pfile, traditional))
496 n -= 2;
497 else if (! CPP_OPTION (pfile, stdc_0_in_system_headers)
498 || CPP_OPTION (pfile, std))
499 n--;
500
501 for (b = builtin_array; b < builtin_array + n; b++)
502 {
503 if ((b->value == BT_HAS_ATTRIBUTE
504 || b->value == BT_HAS_STD_ATTRIBUTE
505 || b->value == BT_HAS_BUILTIN)
506 && (CPP_OPTION (pfile, lang) == CLK_ASM
507 || pfile->cb.has_attribute == NULL))
508 continue;
509 cpp_hashnode *hp = cpp_lookup (pfile, b->name, b->len);
510 hp->type = NT_BUILTIN_MACRO;
511 if (b->always_warn_if_redefined)
512 hp->flags |= NODE_WARN;
513 hp->value.builtin = (enum cpp_builtin_type) b->value;
514 }
515 }
516
517 /* Restore macro C to builtin macro definition. */
518
519 void
_cpp_restore_special_builtin(cpp_reader * pfile,struct def_pragma_macro * c)520 _cpp_restore_special_builtin (cpp_reader *pfile, struct def_pragma_macro *c)
521 {
522 size_t len = strlen (c->name);
523
524 for (const struct builtin_macro *b = builtin_array;
525 b < builtin_array + ARRAY_SIZE (builtin_array); b++)
526 if (b->len == len && memcmp (c->name, b->name, len + 1) == 0)
527 {
528 cpp_hashnode *hp = cpp_lookup (pfile, b->name, b->len);
529 hp->type = NT_BUILTIN_MACRO;
530 if (b->always_warn_if_redefined)
531 hp->flags |= NODE_WARN;
532 hp->value.builtin = (enum cpp_builtin_type) b->value;
533 }
534 }
535
536 /* Read the builtins table above and enter them, and language-specific
537 macros, into the hash table. HOSTED is true if this is a hosted
538 environment. */
539 void
cpp_init_builtins(cpp_reader * pfile,int hosted)540 cpp_init_builtins (cpp_reader *pfile, int hosted)
541 {
542 cpp_init_special_builtins (pfile);
543
544 if (!CPP_OPTION (pfile, traditional)
545 && (! CPP_OPTION (pfile, stdc_0_in_system_headers)
546 || CPP_OPTION (pfile, std)))
547 _cpp_define_builtin (pfile, "__STDC__ 1");
548
549 if (CPP_OPTION (pfile, cplusplus))
550 {
551 /* C++23 is not yet a standard. For now, use an invalid
552 * year/month, 202100L, which is larger than 202002L. */
553 if (CPP_OPTION (pfile, lang) == CLK_CXX23
554 || CPP_OPTION (pfile, lang) == CLK_GNUCXX23)
555 _cpp_define_builtin (pfile, "__cplusplus 202100L");
556 else if (CPP_OPTION (pfile, lang) == CLK_CXX20
557 || CPP_OPTION (pfile, lang) == CLK_GNUCXX20)
558 _cpp_define_builtin (pfile, "__cplusplus 202002L");
559 else if (CPP_OPTION (pfile, lang) == CLK_CXX17
560 || CPP_OPTION (pfile, lang) == CLK_GNUCXX17)
561 _cpp_define_builtin (pfile, "__cplusplus 201703L");
562 else if (CPP_OPTION (pfile, lang) == CLK_CXX14
563 || CPP_OPTION (pfile, lang) == CLK_GNUCXX14)
564 _cpp_define_builtin (pfile, "__cplusplus 201402L");
565 else if (CPP_OPTION (pfile, lang) == CLK_CXX11
566 || CPP_OPTION (pfile, lang) == CLK_GNUCXX11)
567 _cpp_define_builtin (pfile, "__cplusplus 201103L");
568 else
569 _cpp_define_builtin (pfile, "__cplusplus 199711L");
570 }
571 else if (CPP_OPTION (pfile, lang) == CLK_ASM)
572 _cpp_define_builtin (pfile, "__ASSEMBLER__ 1");
573 else if (CPP_OPTION (pfile, lang) == CLK_STDC94)
574 _cpp_define_builtin (pfile, "__STDC_VERSION__ 199409L");
575 else if (CPP_OPTION (pfile, lang) == CLK_STDC2X
576 || CPP_OPTION (pfile, lang) == CLK_GNUC2X)
577 _cpp_define_builtin (pfile, "__STDC_VERSION__ 202000L");
578 else if (CPP_OPTION (pfile, lang) == CLK_STDC17
579 || CPP_OPTION (pfile, lang) == CLK_GNUC17)
580 _cpp_define_builtin (pfile, "__STDC_VERSION__ 201710L");
581 else if (CPP_OPTION (pfile, lang) == CLK_STDC11
582 || CPP_OPTION (pfile, lang) == CLK_GNUC11)
583 _cpp_define_builtin (pfile, "__STDC_VERSION__ 201112L");
584 else if (CPP_OPTION (pfile, c99))
585 _cpp_define_builtin (pfile, "__STDC_VERSION__ 199901L");
586
587 if (CPP_OPTION (pfile, uliterals)
588 && !(CPP_OPTION (pfile, cplusplus)
589 && (CPP_OPTION (pfile, lang) == CLK_GNUCXX
590 || CPP_OPTION (pfile, lang) == CLK_CXX98)))
591 {
592 _cpp_define_builtin (pfile, "__STDC_UTF_16__ 1");
593 _cpp_define_builtin (pfile, "__STDC_UTF_32__ 1");
594 }
595
596 if (hosted)
597 _cpp_define_builtin (pfile, "__STDC_HOSTED__ 1");
598 else
599 _cpp_define_builtin (pfile, "__STDC_HOSTED__ 0");
600
601 if (CPP_OPTION (pfile, objc))
602 _cpp_define_builtin (pfile, "__OBJC__ 1");
603 }
604
605 /* Sanity-checks are dependent on command-line options, so it is
606 called as a subroutine of cpp_read_main_file. */
607 #if CHECKING_P
608 static void sanity_checks (cpp_reader *);
sanity_checks(cpp_reader * pfile)609 static void sanity_checks (cpp_reader *pfile)
610 {
611 cppchar_t test = 0;
612 size_t max_precision = 2 * CHAR_BIT * sizeof (cpp_num_part);
613
614 /* Sanity checks for assumptions about CPP arithmetic and target
615 type precisions made by cpplib. */
616 test--;
617 if (test < 1)
618 cpp_error (pfile, CPP_DL_ICE, "cppchar_t must be an unsigned type");
619
620 if (CPP_OPTION (pfile, precision) > max_precision)
621 cpp_error (pfile, CPP_DL_ICE,
622 "preprocessor arithmetic has maximum precision of %lu bits;"
623 " target requires %lu bits",
624 (unsigned long) max_precision,
625 (unsigned long) CPP_OPTION (pfile, precision));
626
627 if (CPP_OPTION (pfile, precision) < CPP_OPTION (pfile, int_precision))
628 cpp_error (pfile, CPP_DL_ICE,
629 "CPP arithmetic must be at least as precise as a target int");
630
631 if (CPP_OPTION (pfile, char_precision) < 8)
632 cpp_error (pfile, CPP_DL_ICE, "target char is less than 8 bits wide");
633
634 if (CPP_OPTION (pfile, wchar_precision) < CPP_OPTION (pfile, char_precision))
635 cpp_error (pfile, CPP_DL_ICE,
636 "target wchar_t is narrower than target char");
637
638 if (CPP_OPTION (pfile, int_precision) < CPP_OPTION (pfile, char_precision))
639 cpp_error (pfile, CPP_DL_ICE,
640 "target int is narrower than target char");
641
642 /* This is assumed in eval_token() and could be fixed if necessary. */
643 if (sizeof (cppchar_t) > sizeof (cpp_num_part))
644 cpp_error (pfile, CPP_DL_ICE,
645 "CPP half-integer narrower than CPP character");
646
647 if (CPP_OPTION (pfile, wchar_precision) > BITS_PER_CPPCHAR_T)
648 cpp_error (pfile, CPP_DL_ICE,
649 "CPP on this host cannot handle wide character constants over"
650 " %lu bits, but the target requires %lu bits",
651 (unsigned long) BITS_PER_CPPCHAR_T,
652 (unsigned long) CPP_OPTION (pfile, wchar_precision));
653 }
654 #else
655 # define sanity_checks(PFILE)
656 #endif
657
658 /* This is called after options have been parsed, and partially
659 processed. */
660 void
cpp_post_options(cpp_reader * pfile)661 cpp_post_options (cpp_reader *pfile)
662 {
663 int flags;
664
665 sanity_checks (pfile);
666
667 post_options (pfile);
668
669 /* Mark named operators before handling command line macros. */
670 flags = 0;
671 if (CPP_OPTION (pfile, cplusplus) && CPP_OPTION (pfile, operator_names))
672 flags |= NODE_OPERATOR;
673 if (CPP_OPTION (pfile, warn_cxx_operator_names))
674 flags |= NODE_DIAGNOSTIC | NODE_WARN_OPERATOR;
675 if (flags != 0)
676 mark_named_operators (pfile, flags);
677 }
678
679 /* Setup for processing input from the file named FNAME, or stdin if
680 it is the empty string. Return the original filename on success
681 (e.g. foo.i->foo.c), or NULL on failure. INJECTING is true if
682 there may be injected headers before line 1 of the main file. */
683 const char *
cpp_read_main_file(cpp_reader * pfile,const char * fname,bool injecting)684 cpp_read_main_file (cpp_reader *pfile, const char *fname, bool injecting)
685 {
686 if (mkdeps *deps = cpp_get_deps (pfile))
687 /* Set the default target (if there is none already). */
688 deps_add_default_target (deps, fname);
689
690 pfile->main_file
691 = _cpp_find_file (pfile, fname,
692 CPP_OPTION (pfile, preprocessed) ? &pfile->no_search_path
693 : CPP_OPTION (pfile, main_search) == CMS_user
694 ? pfile->quote_include
695 : CPP_OPTION (pfile, main_search) == CMS_system
696 ? pfile->bracket_include : &pfile->no_search_path,
697 /*angle=*/0, _cpp_FFK_NORMAL, 0);
698
699 if (_cpp_find_failed (pfile->main_file))
700 return NULL;
701
702 _cpp_stack_file (pfile, pfile->main_file,
703 injecting || CPP_OPTION (pfile, preprocessed)
704 ? IT_PRE_MAIN : IT_MAIN, 0);
705
706 /* For foo.i, read the original filename foo.c now, for the benefit
707 of the front ends. */
708 if (CPP_OPTION (pfile, preprocessed))
709 if (!read_original_filename (pfile))
710 {
711 /* We're on line 1 after all. */
712 auto *last = linemap_check_ordinary
713 (LINEMAPS_LAST_MAP (pfile->line_table, false));
714 last->to_line = 1;
715 /* Inform of as-if a file change. */
716 _cpp_do_file_change (pfile, LC_RENAME_VERBATIM, LINEMAP_FILE (last),
717 LINEMAP_LINE (last), LINEMAP_SYSP (last));
718 }
719
720 auto *map = LINEMAPS_LAST_ORDINARY_MAP (pfile->line_table);
721 pfile->main_loc = MAP_START_LOCATION (map);
722
723 return ORDINARY_MAP_FILE_NAME (map);
724 }
725
726 location_t
cpp_main_loc(const cpp_reader * pfile)727 cpp_main_loc (const cpp_reader *pfile)
728 {
729 return pfile->main_loc;
730 }
731
732 /* For preprocessed files, if the very first characters are
733 '#<SPACE>[01]<SPACE>', then handle a line directive so we know the
734 original file name. This will generate file_change callbacks,
735 which the front ends must handle appropriately given their state of
736 initialization. We peek directly into the character buffer, so
737 that we're not confused by otherwise-skipped white space &
738 comments. We can be very picky, because this should have been
739 machine-generated text (by us, no less). This way we do not
740 interfere with the module directive state machine. */
741
742 static bool
read_original_filename(cpp_reader * pfile)743 read_original_filename (cpp_reader *pfile)
744 {
745 auto *buf = pfile->buffer->next_line;
746
747 if (pfile->buffer->rlimit - buf > 4
748 && buf[0] == '#'
749 && buf[1] == ' '
750 // Also permit '1', as that's what used to be here
751 && (buf[2] == '0' || buf[2] == '1')
752 && buf[3] == ' ')
753 {
754 const cpp_token *token = _cpp_lex_direct (pfile);
755 gcc_checking_assert (token->type == CPP_HASH);
756 if (_cpp_handle_directive (pfile, token->flags & PREV_WHITE))
757 {
758 read_original_directory (pfile);
759
760 auto *penult = &linemap_check_ordinary
761 (LINEMAPS_LAST_MAP (pfile->line_table, false))[-1];
762 if (penult[1].reason == LC_RENAME_VERBATIM)
763 {
764 /* Expunge any evidence of the original linemap. */
765 pfile->line_table->highest_location
766 = pfile->line_table->highest_line
767 = penult[0].start_location;
768
769 penult[1].start_location = penult[0].start_location;
770 penult[1].reason = penult[0].reason;
771 penult[0] = penult[1];
772 pfile->line_table->info_ordinary.used--;
773 pfile->line_table->info_ordinary.cache = 0;
774 }
775
776 return true;
777 }
778 }
779
780 return false;
781 }
782
783 /* For preprocessed files, if the tokens following the first filename
784 line is of the form # <line> "/path/name//", handle the
785 directive so we know the original current directory.
786
787 As with the first line peeking, we can do this without lexing by
788 being picky. */
789 static void
read_original_directory(cpp_reader * pfile)790 read_original_directory (cpp_reader *pfile)
791 {
792 auto *buf = pfile->buffer->next_line;
793
794 if (pfile->buffer->rlimit - buf > 4
795 && buf[0] == '#'
796 && buf[1] == ' '
797 // Also permit '1', as that's what used to be here
798 && (buf[2] == '0' || buf[2] == '1')
799 && buf[3] == ' ')
800 {
801 const cpp_token *hash = _cpp_lex_direct (pfile);
802 gcc_checking_assert (hash->type == CPP_HASH);
803 pfile->state.in_directive = 1;
804 const cpp_token *number = _cpp_lex_direct (pfile);
805 gcc_checking_assert (number->type == CPP_NUMBER);
806 const cpp_token *string = _cpp_lex_direct (pfile);
807 pfile->state.in_directive = 0;
808
809 const unsigned char *text = nullptr;
810 size_t len = 0;
811 if (string->type == CPP_STRING)
812 {
813 /* The string value includes the quotes. */
814 text = string->val.str.text;
815 len = string->val.str.len;
816 }
817 if (len < 5
818 || !IS_DIR_SEPARATOR (text[len - 2])
819 || !IS_DIR_SEPARATOR (text[len - 3]))
820 {
821 /* That didn't work out, back out. */
822 _cpp_backup_tokens (pfile, 3);
823 return;
824 }
825
826 if (pfile->cb.dir_change)
827 {
828 /* Smash the string directly, it's dead at this point */
829 char *smashy = (char *)text;
830 smashy[len - 3] = 0;
831
832 pfile->cb.dir_change (pfile, smashy + 1);
833 }
834
835 /* We should be at EOL. */
836 }
837 }
838
839 /* This is called at the end of preprocessing. It pops the last
840 buffer and writes dependency output.
841
842 Maybe it should also reset state, such that you could call
843 cpp_start_read with a new filename to restart processing. */
844 void
cpp_finish(cpp_reader * pfile,FILE * deps_stream)845 cpp_finish (cpp_reader *pfile, FILE *deps_stream)
846 {
847 /* Warn about unused macros before popping the final buffer. */
848 if (CPP_OPTION (pfile, warn_unused_macros))
849 cpp_forall_identifiers (pfile, _cpp_warn_if_unused_macro, NULL);
850
851 /* lex.cc leaves the final buffer on the stack. This it so that
852 it returns an unending stream of CPP_EOFs to the client. If we
853 popped the buffer, we'd dereference a NULL buffer pointer and
854 segfault. It's nice to allow the client to do worry-free excess
855 cpp_get_token calls. */
856 while (pfile->buffer)
857 _cpp_pop_buffer (pfile);
858
859 if (deps_stream)
860 deps_write (pfile, deps_stream, 72);
861
862 /* Report on headers that could use multiple include guards. */
863 if (CPP_OPTION (pfile, print_include_names))
864 _cpp_report_missing_guards (pfile);
865 }
866
867 static void
post_options(cpp_reader * pfile)868 post_options (cpp_reader *pfile)
869 {
870 /* -Wtraditional is not useful in C++ mode. */
871 if (CPP_OPTION (pfile, cplusplus))
872 CPP_OPTION (pfile, cpp_warn_traditional) = 0;
873
874 /* Permanently disable macro expansion if we are rescanning
875 preprocessed text. Read preprocesed source in ISO mode. */
876 if (CPP_OPTION (pfile, preprocessed))
877 {
878 if (!CPP_OPTION (pfile, directives_only))
879 pfile->state.prevent_expansion = 1;
880 CPP_OPTION (pfile, traditional) = 0;
881 }
882
883 if (CPP_OPTION (pfile, warn_trigraphs) == 2)
884 CPP_OPTION (pfile, warn_trigraphs) = !CPP_OPTION (pfile, trigraphs);
885
886 if (CPP_OPTION (pfile, traditional))
887 {
888 CPP_OPTION (pfile, trigraphs) = 0;
889 CPP_OPTION (pfile, warn_trigraphs) = 0;
890 }
891
892 if (CPP_OPTION (pfile, module_directives))
893 {
894 /* These unspellable tokens have a leading space. */
895 const char *const inits[spec_nodes::M_HWM]
896 = {"export ", "module ", "import ", "__import"};
897
898 for (int ix = 0; ix != spec_nodes::M_HWM; ix++)
899 {
900 cpp_hashnode *node = cpp_lookup (pfile, UC (inits[ix]),
901 strlen (inits[ix]));
902
903 /* Token we pass to the compiler. */
904 pfile->spec_nodes.n_modules[ix][1] = node;
905
906 if (ix != spec_nodes::M__IMPORT)
907 /* Token we recognize when lexing, drop the trailing ' '. */
908 node = cpp_lookup (pfile, NODE_NAME (node), NODE_LEN (node) - 1);
909
910 node->flags |= NODE_MODULE;
911 pfile->spec_nodes.n_modules[ix][0] = node;
912 }
913 }
914 }
915