1 /* CPP Library.
2 Copyright (C) 1986-2020 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 void 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 };
98
99 static const struct lang_flags lang_defaults[] =
100 { /* c99 c++ xnum xid c11 std digr ulit rlit udlit bincst digsep trig u8chlit vaopt scope dfp */
101 /* GNUC89 */ { 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0 },
102 /* GNUC99 */ { 1, 0, 1, 1, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0 },
103 /* GNUC11 */ { 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0 },
104 /* GNUC17 */ { 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0 },
105 /* GNUC2X */ { 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1 },
106 /* STDC89 */ { 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0 },
107 /* STDC94 */ { 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0 },
108 /* STDC99 */ { 1, 0, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0 },
109 /* STDC11 */ { 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0 },
110 /* STDC17 */ { 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0 },
111 /* STDC2X */ { 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 0, 1, 1 },
112 /* GNUCXX */ { 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0 },
113 /* CXX98 */ { 0, 1, 0, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0 },
114 /* GNUCXX11 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 0 },
115 /* CXX11 */ { 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 0, 1, 0 },
116 /* GNUCXX14 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0 },
117 /* CXX14 */ { 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0 },
118 /* GNUCXX17 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0 },
119 /* CXX17 */ { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0 },
120 /* GNUCXX2A */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0 },
121 /* CXX2A */ { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0 },
122 /* ASM */ { 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
123 };
124
125 /* Sets internal flags correctly for a given language. */
126 void
cpp_set_lang(cpp_reader * pfile,enum c_lang lang)127 cpp_set_lang (cpp_reader *pfile, enum c_lang lang)
128 {
129 const struct lang_flags *l = &lang_defaults[(int) lang];
130
131 CPP_OPTION (pfile, lang) = lang;
132
133 CPP_OPTION (pfile, c99) = l->c99;
134 CPP_OPTION (pfile, cplusplus) = l->cplusplus;
135 CPP_OPTION (pfile, extended_numbers) = l->extended_numbers;
136 CPP_OPTION (pfile, extended_identifiers) = l->extended_identifiers;
137 CPP_OPTION (pfile, c11_identifiers) = l->c11_identifiers;
138 CPP_OPTION (pfile, std) = l->std;
139 CPP_OPTION (pfile, digraphs) = l->digraphs;
140 CPP_OPTION (pfile, uliterals) = l->uliterals;
141 CPP_OPTION (pfile, rliterals) = l->rliterals;
142 CPP_OPTION (pfile, user_literals) = l->user_literals;
143 CPP_OPTION (pfile, binary_constants) = l->binary_constants;
144 CPP_OPTION (pfile, digit_separators) = l->digit_separators;
145 CPP_OPTION (pfile, trigraphs) = l->trigraphs;
146 CPP_OPTION (pfile, utf8_char_literals) = l->utf8_char_literals;
147 CPP_OPTION (pfile, va_opt) = l->va_opt;
148 CPP_OPTION (pfile, scope) = l->scope;
149 CPP_OPTION (pfile, dfp_constants) = l->dfp_constants;
150 }
151
152 /* Initialize library global state. */
153 static void
init_library(void)154 init_library (void)
155 {
156 static int initialized = 0;
157
158 if (! initialized)
159 {
160 initialized = 1;
161
162 _cpp_init_lexer ();
163
164 /* Set up the trigraph map. This doesn't need to do anything if
165 we were compiled with a compiler that supports C99 designated
166 initializers. */
167 init_trigraph_map ();
168
169 #ifdef ENABLE_NLS
170 (void) bindtextdomain (PACKAGE, LOCALEDIR);
171 #endif
172 }
173 }
174
175 /* Initialize a cpp_reader structure. */
176 cpp_reader *
cpp_create_reader(enum c_lang lang,cpp_hash_table * table,class line_maps * line_table)177 cpp_create_reader (enum c_lang lang, cpp_hash_table *table,
178 class line_maps *line_table)
179 {
180 cpp_reader *pfile;
181
182 /* Initialize this instance of the library if it hasn't been already. */
183 init_library ();
184
185 pfile = XCNEW (cpp_reader);
186 memset (&pfile->base_context, 0, sizeof (pfile->base_context));
187
188 cpp_set_lang (pfile, lang);
189 CPP_OPTION (pfile, warn_multichar) = 1;
190 CPP_OPTION (pfile, discard_comments) = 1;
191 CPP_OPTION (pfile, discard_comments_in_macro_exp) = 1;
192 CPP_OPTION (pfile, max_include_depth) = 200;
193 CPP_OPTION (pfile, tabstop) = 8;
194 CPP_OPTION (pfile, operator_names) = 1;
195 CPP_OPTION (pfile, warn_trigraphs) = 2;
196 CPP_OPTION (pfile, warn_endif_labels) = 1;
197 CPP_OPTION (pfile, cpp_warn_c90_c99_compat) = -1;
198 CPP_OPTION (pfile, cpp_warn_c11_c2x_compat) = -1;
199 CPP_OPTION (pfile, cpp_warn_cxx11_compat) = 0;
200 CPP_OPTION (pfile, cpp_warn_deprecated) = 1;
201 CPP_OPTION (pfile, cpp_warn_long_long) = 0;
202 CPP_OPTION (pfile, dollars_in_ident) = 1;
203 CPP_OPTION (pfile, warn_dollars) = 1;
204 CPP_OPTION (pfile, warn_variadic_macros) = 1;
205 CPP_OPTION (pfile, warn_builtin_macro_redefined) = 1;
206 CPP_OPTION (pfile, cpp_warn_implicit_fallthrough) = 0;
207 /* By default, track locations of tokens resulting from macro
208 expansion. The '2' means, track the locations with the highest
209 accuracy. Read the comments for struct
210 cpp_options::track_macro_expansion to learn about the other
211 values. */
212 CPP_OPTION (pfile, track_macro_expansion) = 2;
213 CPP_OPTION (pfile, warn_normalize) = normalized_C;
214 CPP_OPTION (pfile, warn_literal_suffix) = 1;
215 CPP_OPTION (pfile, canonical_system_headers)
216 = ENABLE_CANONICAL_SYSTEM_HEADERS;
217 CPP_OPTION (pfile, ext_numeric_literals) = 1;
218 CPP_OPTION (pfile, warn_date_time) = 0;
219
220 /* Default CPP arithmetic to something sensible for the host for the
221 benefit of dumb users like fix-header. */
222 CPP_OPTION (pfile, precision) = CHAR_BIT * sizeof (long);
223 CPP_OPTION (pfile, char_precision) = CHAR_BIT;
224 CPP_OPTION (pfile, wchar_precision) = CHAR_BIT * sizeof (int);
225 CPP_OPTION (pfile, int_precision) = CHAR_BIT * sizeof (int);
226 CPP_OPTION (pfile, unsigned_char) = 0;
227 CPP_OPTION (pfile, unsigned_wchar) = 1;
228 CPP_OPTION (pfile, bytes_big_endian) = 1; /* does not matter */
229
230 /* Default to no charset conversion. */
231 CPP_OPTION (pfile, narrow_charset) = _cpp_default_encoding ();
232 CPP_OPTION (pfile, wide_charset) = 0;
233
234 /* Default the input character set to UTF-8. */
235 CPP_OPTION (pfile, input_charset) = _cpp_default_encoding ();
236
237 /* A fake empty "directory" used as the starting point for files
238 looked up without a search path. Name cannot be '/' because we
239 don't want to prepend anything at all to filenames using it. All
240 other entries are correct zero-initialized. */
241 pfile->no_search_path.name = (char *) "";
242
243 /* Initialize the line map. */
244 pfile->line_table = line_table;
245
246 /* Initialize lexer state. */
247 pfile->state.save_comments = ! CPP_OPTION (pfile, discard_comments);
248
249 /* Set up static tokens. */
250 pfile->avoid_paste.type = CPP_PADDING;
251 pfile->avoid_paste.val.source = NULL;
252 pfile->eof.type = CPP_EOF;
253 pfile->eof.flags = 0;
254
255 /* Create a token buffer for the lexer. */
256 _cpp_init_tokenrun (&pfile->base_run, 250);
257 pfile->cur_run = &pfile->base_run;
258 pfile->cur_token = pfile->base_run.base;
259
260 /* Initialize the base context. */
261 pfile->context = &pfile->base_context;
262 pfile->base_context.c.macro = 0;
263 pfile->base_context.prev = pfile->base_context.next = 0;
264
265 /* Aligned and unaligned storage. */
266 pfile->a_buff = _cpp_get_buff (pfile, 0);
267 pfile->u_buff = _cpp_get_buff (pfile, 0);
268
269 /* Initialize table for push_macro/pop_macro. */
270 pfile->pushed_macros = 0;
271
272 /* Do not force token locations by default. */
273 pfile->forced_token_location = 0;
274
275 /* Initialize source_date_epoch to -2 (not yet set). */
276 pfile->source_date_epoch = (time_t) -2;
277
278 /* The expression parser stack. */
279 _cpp_expand_op_stack (pfile);
280
281 /* Initialize the buffer obstack. */
282 obstack_specify_allocation (&pfile->buffer_ob, 0, 0, xmalloc, free);
283
284 _cpp_init_files (pfile);
285
286 _cpp_init_hashtable (pfile, table);
287
288 return pfile;
289 }
290
291 /* Set the line_table entry in PFILE. This is called after reading a
292 PCH file, as the old line_table will be incorrect. */
293 void
cpp_set_line_map(cpp_reader * pfile,class line_maps * line_table)294 cpp_set_line_map (cpp_reader *pfile, class line_maps *line_table)
295 {
296 pfile->line_table = line_table;
297 }
298
299 /* Free resources used by PFILE. Accessing PFILE after this function
300 returns leads to undefined behavior. Returns the error count. */
301 void
cpp_destroy(cpp_reader * pfile)302 cpp_destroy (cpp_reader *pfile)
303 {
304 cpp_context *context, *contextn;
305 struct def_pragma_macro *pmacro;
306 tokenrun *run, *runn;
307 int i;
308
309 free (pfile->op_stack);
310
311 while (CPP_BUFFER (pfile) != NULL)
312 _cpp_pop_buffer (pfile);
313
314 free (pfile->out.base);
315
316 if (pfile->macro_buffer)
317 {
318 free (pfile->macro_buffer);
319 pfile->macro_buffer = NULL;
320 pfile->macro_buffer_len = 0;
321 }
322
323 if (pfile->deps)
324 deps_free (pfile->deps);
325 obstack_free (&pfile->buffer_ob, 0);
326
327 _cpp_destroy_hashtable (pfile);
328 _cpp_cleanup_files (pfile);
329 _cpp_destroy_iconv (pfile);
330
331 _cpp_free_buff (pfile->a_buff);
332 _cpp_free_buff (pfile->u_buff);
333 _cpp_free_buff (pfile->free_buffs);
334
335 for (run = &pfile->base_run; run; run = runn)
336 {
337 runn = run->next;
338 free (run->base);
339 if (run != &pfile->base_run)
340 free (run);
341 }
342
343 for (context = pfile->base_context.next; context; context = contextn)
344 {
345 contextn = context->next;
346 free (context);
347 }
348
349 if (pfile->comments.entries)
350 {
351 for (i = 0; i < pfile->comments.count; i++)
352 free (pfile->comments.entries[i].comment);
353
354 free (pfile->comments.entries);
355 }
356 if (pfile->pushed_macros)
357 {
358 do
359 {
360 pmacro = pfile->pushed_macros;
361 pfile->pushed_macros = pmacro->next;
362 free (pmacro->name);
363 free (pmacro);
364 }
365 while (pfile->pushed_macros);
366 }
367
368 free (pfile);
369 }
370
371 /* This structure defines one built-in identifier. A node will be
372 entered in the hash table under the name NAME, with value VALUE.
373
374 There are two tables of these. builtin_array holds all the
375 "builtin" macros: these are handled by builtin_macro() in
376 macro.c. Builtin is somewhat of a misnomer -- the property of
377 interest is that these macros require special code to compute their
378 expansions. The value is a "cpp_builtin_type" enumerator.
379
380 operator_array holds the C++ named operators. These are keywords
381 which act as aliases for punctuators. In C++, they cannot be
382 altered through #define, and #if recognizes them as operators. In
383 C, these are not entered into the hash table at all (but see
384 <iso646.h>). The value is a token-type enumerator. */
385 struct builtin_macro
386 {
387 const uchar *const name;
388 const unsigned short len;
389 const unsigned short value;
390 const bool always_warn_if_redefined;
391 };
392
393 #define B(n, t, f) { DSC(n), t, f }
394 static const struct builtin_macro builtin_array[] =
395 {
396 B("__TIMESTAMP__", BT_TIMESTAMP, false),
397 B("__TIME__", BT_TIME, false),
398 B("__DATE__", BT_DATE, false),
399 B("__FILE__", BT_FILE, false),
400 B("__BASE_FILE__", BT_BASE_FILE, false),
401 B("__LINE__", BT_SPECLINE, true),
402 B("__INCLUDE_LEVEL__", BT_INCLUDE_LEVEL, true),
403 B("__COUNTER__", BT_COUNTER, true),
404 /* Make sure to update the list of built-in
405 function-like macros in traditional.c:
406 fun_like_macro() when adding more following */
407 B("__has_attribute", BT_HAS_ATTRIBUTE, true),
408 B("__has_cpp_attribute", BT_HAS_ATTRIBUTE, true),
409 B("__has_builtin", BT_HAS_BUILTIN, true),
410 B("__has_include", BT_HAS_INCLUDE, true),
411 B("__has_include_next",BT_HAS_INCLUDE_NEXT, true),
412 /* Keep builtins not used for -traditional-cpp at the end, and
413 update init_builtins() if any more are added. */
414 B("_Pragma", BT_PRAGMA, true),
415 B("__STDC__", BT_STDC, true),
416 };
417 #undef B
418
419 struct builtin_operator
420 {
421 const uchar *const name;
422 const unsigned short len;
423 const unsigned short value;
424 };
425
426 #define B(n, t) { DSC(n), t }
427 static const struct builtin_operator operator_array[] =
428 {
429 B("and", CPP_AND_AND),
430 B("and_eq", CPP_AND_EQ),
431 B("bitand", CPP_AND),
432 B("bitor", CPP_OR),
433 B("compl", CPP_COMPL),
434 B("not", CPP_NOT),
435 B("not_eq", CPP_NOT_EQ),
436 B("or", CPP_OR_OR),
437 B("or_eq", CPP_OR_EQ),
438 B("xor", CPP_XOR),
439 B("xor_eq", CPP_XOR_EQ)
440 };
441 #undef B
442
443 /* Mark the C++ named operators in the hash table. */
444 static void
mark_named_operators(cpp_reader * pfile,int flags)445 mark_named_operators (cpp_reader *pfile, int flags)
446 {
447 const struct builtin_operator *b;
448
449 for (b = operator_array;
450 b < (operator_array + ARRAY_SIZE (operator_array));
451 b++)
452 {
453 cpp_hashnode *hp = cpp_lookup (pfile, b->name, b->len);
454 hp->flags |= flags;
455 hp->is_directive = 0;
456 hp->directive_index = b->value;
457 }
458 }
459
460 /* Helper function of cpp_type2name. Return the string associated with
461 named operator TYPE. */
462 const char *
cpp_named_operator2name(enum cpp_ttype type)463 cpp_named_operator2name (enum cpp_ttype type)
464 {
465 const struct builtin_operator *b;
466
467 for (b = operator_array;
468 b < (operator_array + ARRAY_SIZE (operator_array));
469 b++)
470 {
471 if (type == b->value)
472 return (const char *) b->name;
473 }
474
475 return NULL;
476 }
477
478 void
cpp_init_special_builtins(cpp_reader * pfile)479 cpp_init_special_builtins (cpp_reader *pfile)
480 {
481 const struct builtin_macro *b;
482 size_t n = ARRAY_SIZE (builtin_array);
483
484 if (CPP_OPTION (pfile, traditional))
485 n -= 2;
486 else if (! CPP_OPTION (pfile, stdc_0_in_system_headers)
487 || CPP_OPTION (pfile, std))
488 n--;
489
490 for (b = builtin_array; b < builtin_array + n; b++)
491 {
492 if ((b->value == BT_HAS_ATTRIBUTE
493 || b->value == BT_HAS_BUILTIN)
494 && (CPP_OPTION (pfile, lang) == CLK_ASM
495 || pfile->cb.has_attribute == NULL))
496 continue;
497 cpp_hashnode *hp = cpp_lookup (pfile, b->name, b->len);
498 hp->type = NT_BUILTIN_MACRO;
499 if (b->always_warn_if_redefined)
500 hp->flags |= NODE_WARN;
501 hp->value.builtin = (enum cpp_builtin_type) b->value;
502 }
503 }
504
505 /* Restore macro C to builtin macro definition. */
506
507 void
_cpp_restore_special_builtin(cpp_reader * pfile,struct def_pragma_macro * c)508 _cpp_restore_special_builtin (cpp_reader *pfile, struct def_pragma_macro *c)
509 {
510 size_t len = strlen (c->name);
511
512 for (const struct builtin_macro *b = builtin_array;
513 b < builtin_array + ARRAY_SIZE (builtin_array); b++)
514 if (b->len == len && memcmp (c->name, b->name, len + 1) == 0)
515 {
516 cpp_hashnode *hp = cpp_lookup (pfile, b->name, b->len);
517 hp->type = NT_BUILTIN_MACRO;
518 if (b->always_warn_if_redefined)
519 hp->flags |= NODE_WARN;
520 hp->value.builtin = (enum cpp_builtin_type) b->value;
521 }
522 }
523
524 /* Read the builtins table above and enter them, and language-specific
525 macros, into the hash table. HOSTED is true if this is a hosted
526 environment. */
527 void
cpp_init_builtins(cpp_reader * pfile,int hosted)528 cpp_init_builtins (cpp_reader *pfile, int hosted)
529 {
530 cpp_init_special_builtins (pfile);
531
532 if (!CPP_OPTION (pfile, traditional)
533 && (! CPP_OPTION (pfile, stdc_0_in_system_headers)
534 || CPP_OPTION (pfile, std)))
535 _cpp_define_builtin (pfile, "__STDC__ 1");
536
537 if (CPP_OPTION (pfile, cplusplus))
538 {
539 if (CPP_OPTION (pfile, lang) == CLK_CXX2A
540 || CPP_OPTION (pfile, lang) == CLK_GNUCXX2A)
541 _cpp_define_builtin (pfile, "__cplusplus 201709L");
542 else if (CPP_OPTION (pfile, lang) == CLK_CXX17
543 || CPP_OPTION (pfile, lang) == CLK_GNUCXX17)
544 _cpp_define_builtin (pfile, "__cplusplus 201703L");
545 else if (CPP_OPTION (pfile, lang) == CLK_CXX14
546 || CPP_OPTION (pfile, lang) == CLK_GNUCXX14)
547 _cpp_define_builtin (pfile, "__cplusplus 201402L");
548 else if (CPP_OPTION (pfile, lang) == CLK_CXX11
549 || CPP_OPTION (pfile, lang) == CLK_GNUCXX11)
550 _cpp_define_builtin (pfile, "__cplusplus 201103L");
551 else
552 _cpp_define_builtin (pfile, "__cplusplus 199711L");
553 }
554 else if (CPP_OPTION (pfile, lang) == CLK_ASM)
555 _cpp_define_builtin (pfile, "__ASSEMBLER__ 1");
556 else if (CPP_OPTION (pfile, lang) == CLK_STDC94)
557 _cpp_define_builtin (pfile, "__STDC_VERSION__ 199409L");
558 else if (CPP_OPTION (pfile, lang) == CLK_STDC2X
559 || CPP_OPTION (pfile, lang) == CLK_GNUC2X)
560 _cpp_define_builtin (pfile, "__STDC_VERSION__ 202000L");
561 else if (CPP_OPTION (pfile, lang) == CLK_STDC17
562 || CPP_OPTION (pfile, lang) == CLK_GNUC17)
563 _cpp_define_builtin (pfile, "__STDC_VERSION__ 201710L");
564 else if (CPP_OPTION (pfile, lang) == CLK_STDC11
565 || CPP_OPTION (pfile, lang) == CLK_GNUC11)
566 _cpp_define_builtin (pfile, "__STDC_VERSION__ 201112L");
567 else if (CPP_OPTION (pfile, c99))
568 _cpp_define_builtin (pfile, "__STDC_VERSION__ 199901L");
569
570 if (CPP_OPTION (pfile, uliterals)
571 && !(CPP_OPTION (pfile, cplusplus)
572 && (CPP_OPTION (pfile, lang) == CLK_GNUCXX
573 || CPP_OPTION (pfile, lang) == CLK_CXX98)))
574 {
575 _cpp_define_builtin (pfile, "__STDC_UTF_16__ 1");
576 _cpp_define_builtin (pfile, "__STDC_UTF_32__ 1");
577 }
578
579 if (hosted)
580 _cpp_define_builtin (pfile, "__STDC_HOSTED__ 1");
581 else
582 _cpp_define_builtin (pfile, "__STDC_HOSTED__ 0");
583
584 if (CPP_OPTION (pfile, objc))
585 _cpp_define_builtin (pfile, "__OBJC__ 1");
586 }
587
588 /* Sanity-checks are dependent on command-line options, so it is
589 called as a subroutine of cpp_read_main_file. */
590 #if CHECKING_P
591 static void sanity_checks (cpp_reader *);
sanity_checks(cpp_reader * pfile)592 static void sanity_checks (cpp_reader *pfile)
593 {
594 cppchar_t test = 0;
595 size_t max_precision = 2 * CHAR_BIT * sizeof (cpp_num_part);
596
597 /* Sanity checks for assumptions about CPP arithmetic and target
598 type precisions made by cpplib. */
599 test--;
600 if (test < 1)
601 cpp_error (pfile, CPP_DL_ICE, "cppchar_t must be an unsigned type");
602
603 if (CPP_OPTION (pfile, precision) > max_precision)
604 cpp_error (pfile, CPP_DL_ICE,
605 "preprocessor arithmetic has maximum precision of %lu bits;"
606 " target requires %lu bits",
607 (unsigned long) max_precision,
608 (unsigned long) CPP_OPTION (pfile, precision));
609
610 if (CPP_OPTION (pfile, precision) < CPP_OPTION (pfile, int_precision))
611 cpp_error (pfile, CPP_DL_ICE,
612 "CPP arithmetic must be at least as precise as a target int");
613
614 if (CPP_OPTION (pfile, char_precision) < 8)
615 cpp_error (pfile, CPP_DL_ICE, "target char is less than 8 bits wide");
616
617 if (CPP_OPTION (pfile, wchar_precision) < CPP_OPTION (pfile, char_precision))
618 cpp_error (pfile, CPP_DL_ICE,
619 "target wchar_t is narrower than target char");
620
621 if (CPP_OPTION (pfile, int_precision) < CPP_OPTION (pfile, char_precision))
622 cpp_error (pfile, CPP_DL_ICE,
623 "target int is narrower than target char");
624
625 /* This is assumed in eval_token() and could be fixed if necessary. */
626 if (sizeof (cppchar_t) > sizeof (cpp_num_part))
627 cpp_error (pfile, CPP_DL_ICE,
628 "CPP half-integer narrower than CPP character");
629
630 if (CPP_OPTION (pfile, wchar_precision) > BITS_PER_CPPCHAR_T)
631 cpp_error (pfile, CPP_DL_ICE,
632 "CPP on this host cannot handle wide character constants over"
633 " %lu bits, but the target requires %lu bits",
634 (unsigned long) BITS_PER_CPPCHAR_T,
635 (unsigned long) CPP_OPTION (pfile, wchar_precision));
636 }
637 #else
638 # define sanity_checks(PFILE)
639 #endif
640
641 /* This is called after options have been parsed, and partially
642 processed. */
643 void
cpp_post_options(cpp_reader * pfile)644 cpp_post_options (cpp_reader *pfile)
645 {
646 int flags;
647
648 sanity_checks (pfile);
649
650 post_options (pfile);
651
652 /* Mark named operators before handling command line macros. */
653 flags = 0;
654 if (CPP_OPTION (pfile, cplusplus) && CPP_OPTION (pfile, operator_names))
655 flags |= NODE_OPERATOR;
656 if (CPP_OPTION (pfile, warn_cxx_operator_names))
657 flags |= NODE_DIAGNOSTIC | NODE_WARN_OPERATOR;
658 if (flags != 0)
659 mark_named_operators (pfile, flags);
660 }
661
662 /* Setup for processing input from the file named FNAME, or stdin if
663 it is the empty string. Return the original filename
664 on success (e.g. foo.i->foo.c), or NULL on failure. */
665 const char *
cpp_read_main_file(cpp_reader * pfile,const char * fname)666 cpp_read_main_file (cpp_reader *pfile, const char *fname)
667 {
668 const location_t loc = 0;
669
670 if (CPP_OPTION (pfile, deps.style) != DEPS_NONE)
671 {
672 if (!pfile->deps)
673 pfile->deps = deps_init ();
674
675 /* Set the default target (if there is none already). */
676 deps_add_default_target (pfile->deps, fname);
677 }
678
679 pfile->main_file
680 = _cpp_find_file (pfile, fname, &pfile->no_search_path, /*angle=*/0,
681 /*fake=*/false, /*preinclude=*/false, /*hasinclude=*/false,
682 loc);
683 if (_cpp_find_failed (pfile->main_file))
684 return NULL;
685
686 _cpp_stack_file (pfile, pfile->main_file, IT_MAIN, 0);
687
688 /* For foo.i, read the original filename foo.c now, for the benefit
689 of the front ends. */
690 if (CPP_OPTION (pfile, preprocessed))
691 {
692 read_original_filename (pfile);
693 fname =
694 ORDINARY_MAP_FILE_NAME
695 ((LINEMAPS_LAST_ORDINARY_MAP (pfile->line_table)));
696 }
697 return fname;
698 }
699
700 /* For preprocessed files, if the first tokens are of the form # NUM.
701 handle the directive so we know the original file name. This will
702 generate file_change callbacks, which the front ends must handle
703 appropriately given their state of initialization. */
704 static void
read_original_filename(cpp_reader * pfile)705 read_original_filename (cpp_reader *pfile)
706 {
707 const cpp_token *token, *token1;
708
709 /* Lex ahead; if the first tokens are of the form # NUM, then
710 process the directive, otherwise back up. */
711 token = _cpp_lex_direct (pfile);
712 if (token->type == CPP_HASH)
713 {
714 pfile->state.in_directive = 1;
715 token1 = _cpp_lex_direct (pfile);
716 _cpp_backup_tokens (pfile, 1);
717 pfile->state.in_directive = 0;
718
719 /* If it's a #line directive, handle it. */
720 if (token1->type == CPP_NUMBER
721 && _cpp_handle_directive (pfile, token->flags & PREV_WHITE))
722 {
723 read_original_directory (pfile);
724 return;
725 }
726 }
727
728 /* Backup as if nothing happened. */
729 _cpp_backup_tokens (pfile, 1);
730 }
731
732 /* For preprocessed files, if the tokens following the first filename
733 line is of the form # <line> "/path/name//", handle the
734 directive so we know the original current directory. */
735 static void
read_original_directory(cpp_reader * pfile)736 read_original_directory (cpp_reader *pfile)
737 {
738 const cpp_token *hash, *token;
739
740 /* Lex ahead; if the first tokens are of the form # NUM, then
741 process the directive, otherwise back up. */
742 hash = _cpp_lex_direct (pfile);
743 if (hash->type != CPP_HASH)
744 {
745 _cpp_backup_tokens (pfile, 1);
746 return;
747 }
748
749 token = _cpp_lex_direct (pfile);
750
751 if (token->type != CPP_NUMBER)
752 {
753 _cpp_backup_tokens (pfile, 2);
754 return;
755 }
756
757 token = _cpp_lex_direct (pfile);
758
759 if (token->type != CPP_STRING
760 || ! (token->val.str.len >= 5
761 && IS_DIR_SEPARATOR (token->val.str.text[token->val.str.len-2])
762 && IS_DIR_SEPARATOR (token->val.str.text[token->val.str.len-3])))
763 {
764 _cpp_backup_tokens (pfile, 3);
765 return;
766 }
767
768 if (pfile->cb.dir_change)
769 {
770 char *debugdir = (char *) alloca (token->val.str.len - 3);
771
772 memcpy (debugdir, (const char *) token->val.str.text + 1,
773 token->val.str.len - 4);
774 debugdir[token->val.str.len - 4] = '\0';
775
776 pfile->cb.dir_change (pfile, debugdir);
777 }
778 }
779
780 /* This is called at the end of preprocessing. It pops the last
781 buffer and writes dependency output.
782
783 Maybe it should also reset state, such that you could call
784 cpp_start_read with a new filename to restart processing. */
785 void
cpp_finish(cpp_reader * pfile,FILE * deps_stream)786 cpp_finish (cpp_reader *pfile, FILE *deps_stream)
787 {
788 /* Warn about unused macros before popping the final buffer. */
789 if (CPP_OPTION (pfile, warn_unused_macros))
790 cpp_forall_identifiers (pfile, _cpp_warn_if_unused_macro, NULL);
791
792 /* lex.c leaves the final buffer on the stack. This it so that
793 it returns an unending stream of CPP_EOFs to the client. If we
794 popped the buffer, we'd dereference a NULL buffer pointer and
795 segfault. It's nice to allow the client to do worry-free excess
796 cpp_get_token calls. */
797 while (pfile->buffer)
798 _cpp_pop_buffer (pfile);
799
800 if (CPP_OPTION (pfile, deps.style) != DEPS_NONE && deps_stream)
801 deps_write (pfile->deps, deps_stream,
802 CPP_OPTION (pfile, deps.phony_targets), 72);
803
804 /* Report on headers that could use multiple include guards. */
805 if (CPP_OPTION (pfile, print_include_names))
806 _cpp_report_missing_guards (pfile);
807 }
808
809 static void
post_options(cpp_reader * pfile)810 post_options (cpp_reader *pfile)
811 {
812 /* -Wtraditional is not useful in C++ mode. */
813 if (CPP_OPTION (pfile, cplusplus))
814 CPP_OPTION (pfile, cpp_warn_traditional) = 0;
815
816 /* Permanently disable macro expansion if we are rescanning
817 preprocessed text. Read preprocesed source in ISO mode. */
818 if (CPP_OPTION (pfile, preprocessed))
819 {
820 if (!CPP_OPTION (pfile, directives_only))
821 pfile->state.prevent_expansion = 1;
822 CPP_OPTION (pfile, traditional) = 0;
823 }
824
825 if (CPP_OPTION (pfile, warn_trigraphs) == 2)
826 CPP_OPTION (pfile, warn_trigraphs) = !CPP_OPTION (pfile, trigraphs);
827
828 if (CPP_OPTION (pfile, traditional))
829 {
830 CPP_OPTION (pfile, trigraphs) = 0;
831 CPP_OPTION (pfile, warn_trigraphs) = 0;
832 }
833 }
834